China is a major WSD one pack stabilizer producer of PVC is also the world 's largest consumer of

China is a major producer of PVC , but also the world's largest consumer. 2007 China PVC production capacity has reached 14.5 million , t increase of 45 % compared to 2006 , the average annual growth rate for the world nine times , accounting for 30 % of the world 's total PVC . With the further expansion of PVC production capacity , demand for PVC heat stabilizers also continue to rise. Since the mid- 1950s , China began producing self- supporting since PVC heat stabilizers , heat stabilizers for PVC consumption With the rapid development of the industry and a substantial increase in heat stabilizers developed into the second largest plastics additives products. At present, China plastic heat stabilizer production enterprises have more than 100 , while the low-end of the lead salt heat stabilizer is still overwhelmingly dominant , industry 60% of enterprises due to technical reasons plastic processing aid only to produce lead salt -based heat stabilizers , domestic PVC products in more than 65% or the use of lead salt heat stabilizer ( metal soap and composite metal soap is also part of the lead soap heat stabilizers ) , the annual amount of up to about 120 000 t. To avoid potential lead contamination , improve people's living environment , China since 2003 began a comprehensive campaign to ban lead . Ministry of Construction in 2004 began requiring the use of non- national lead salt water pipes PVC heat stabilizers ; Beijing from April 1, 2005 began restricting the use of lead- salt heat stabilizer PVC pipes for drinking water ; power system also introduced a ban within the grid regulations governing the use of chlorinated PVC protective lead salts and organic tin heat stabilizer to prevent environmental pollution, especially pollution of groundwater sources . PVC profiles have now begun to explore the lead-free. China's environmental PVC heat stabilizerprotection type calcium / zinc heat stabilizers are still dependent on foreign imports , but the price is expensive, imported calcium / zinc heat stabilizers are generally in the 3 to 5 million /; t because the domestic PVC heat stabilizer production of PVC heat stabilizers business technology behind domestic calcium / zinc complex heat organic pigments stabilizer market is still unable to meet performance requirements . Lead salt heat stabilizer deadline can not be disabled , to some extent hindered the goal of a comprehensive ban on schedule to achieve the lead pollution of the environment still exist and are widening. Carry out the role of non-toxic compound heat stabilizer technology research and development , and to achieve large-scale domestic production , to ensure the sustainable development of economy, society, environment build harmonious relationship between man and nature , have very important .

Study describes the use of red iron oxide

What is red iron oxide Perhaps you know that you are its knowledge and understanding of how it? Here to give you about the use of red iron oxide Analysis, hope you like it.
The following is the analysis of iron oxide red Uses: 1, red iron oxide pigments in various types of precast concrete products and building materials as pigments or coloring agents, directly into the plastic flame retardant  application of cement. A variety of indoor and outdoor color concrete surfaces, such as walls, floors, ceilings, pillars, porches, roads, parking lots, stairs, stations, etc.; various architectural ceramics and glass ceramics, such as tiles, floor tiles, roof tiles, panels , terrazzo, mosaic tiles, artificial marble.
2, iron oxide pigments for coloring a variety of coatings and protective substances, including water-based interior and exterior paints, powder coatings, etc.; also apply to oil paint, including epoxy, alkyd, amino and other primers and topcoats; also available in the toy paint, decorative paint, furniture paint, electrophoretic lacquers and enamels.
3, iron oxide pigments for coloring plastics, such as thermosets and thermoplastics, and rubber products, coloring, such as automobile inner tubes, aircraft inner tube, bicycle inner tube and so on.
4, red iron oxide commonly used in construction, rubber, plastics, paint  lead stearate and other industries, particularly iron oxide red primer with rust function, you can replace the expensive red lead paint, saving non-ferrous metals. High Ground material, for use in precision metal instruments, optical glass polishing. Powder metallurgy high purity is the main base for various magnetic alloy smelting and other senior alloy steels. By the ferrous sulfate or iron oxide yellow, or scraps of iron mixed by high temperature calcination, or directly from the liquid medium is made.
5, red in the building materials industry, mainly epoxidation of soybean oil  for color cement, colored cement tiles, colored cement tiles, imitation glazed tiles, concrete tiles, colored mortar, colored asphalt, terrazzo, mosaic tiles, artificial marble and stucco walls, etc.; in the paints and coatings industry is mainly used to manufacture a variety of paints, coatings, inks. In other industries, such as ceramics, rubber, plastics, leather, pulp used to make arrangements light coloring agent and a filler. 6, used in paints, rubber, plastics, construction, coloring, in addition to iron oxide pigments can also be used for all kinds of cosmetics, paper, leather coloring.

How polyacrylamide as aluminum sulfate coagulant

Aluminum sulfate polyacrylamide can be suspended solids in the sewage play coagulation, sedimentation . Sewage flocculant is used . Aluminum sulfate polyacrylamide price than low prices many times , the effect was not good polyacrylamide . And if the use of aluminum sulfate polyacrylamide sewage added as its coagulant , can play a coagulant effect is obvious, turbidity and organic matter removal efficiency have been significantly improved.
How polyacrylamide as aluminum sulfate coagulant
Polyacrylamide as an inorganic coagulant aluminum sulfate coagulant , mainly due to some chain polyacrylamide macromolecules , play  chrome green and network bridging flocculation flocculation effect , because of its electrostatic attraction , hydrogen bonding, hydrophobic keys and features reaction to colloid charge neutralization and bridging role , so that in the adsorbed particles asked to form a " bridge ." Produce floc . Thus speeding up the sinking particles , forming a large and dense alum . The use of long-chain molecules bridging role in the formation of an inorganic coagulant floc surrounded. The floc closely. Particle sedimentation rate accelerated. Flocculation through further reaction . The particles in the water gradually extruded particle sedimentation rate of speed so that thus the coagulation effect is plastic processing aid  improved. Adding aluminum sulfate polyacrylamide in dosage can be achieved when there are fewer good coagulation effect , ie coagulation effect in the same circumstances, plus polyacrylamide coagulant than without when aluminum sulfate dosage to save much more .
Polyacrylamide coagulant effect
 Polyacrylamide coagulant aid is to accelerate the coagulation process procedure , increase the quality and density of the particles to be more rapid precipitation. While strengthening the role of bonding and bridging , and the flocculation and sedimentation of coarse particles have a greater surface , can give full play to the role of adsorption swept volume , improve clarifying effect .
Polyacrylamide flocculant , is often used  PVC heat stabilizer for profile as an inorganic coagulant coagulant , alum formed joint processing large , fast settling , flocculation , the large and solid particle sedimentation rate is greatly enhanced , so treatment is better . Aluminum sulfate in polyamine coagulant effect of turbidity and organic matter removal efficiency have been improved , the overall cost reduction, wastewater treatment cost savings for the enterprise .

Cadmium zinc stearate and stearic acid , magnesium stearate difference

Technical indicators a zinc stearate , molecular formula : Zn (C17H35COO) 2 two , molecular weight : 631 Third, the production process: stearic acid in hot water and lye saponification reaction with sodium stearate and zinc chloride occurred metathesis reaction of zinc stearate , dehydrated , and Acrylic impact modifier  air drying the finished product . Fourth, the physical and chemical properties : White light powder , specific gravity 1.095 , a greasy feel , insoluble in water , soluble in hot ethanol , benzene and turpentine and other organic solvents, strong acid is decomposed into stearic acid and corresponding zinc ,
  Magnesium stearate technical indicators one , Formula : Mg (C17H35COO) 2 two , sub Quality : 591 Third, the  triple pressed stearic acid production process: stearic acid in hot water and lye saponification reaction with sodium stearate and magnesium occur metathesis reaction of magnesium stearate, dehydrated , and air drying the finished product . Fourth, the physical and chemical properties : White light powder , specific gravity 1.028 , tasteless, slightly soluble in water , soluble in hot ethanol , the event is decomposed into stearic acid and corresponding magnesium salts , this product is hygroscopic .
  Technical indicators a cadmium stearate , molecular formula : (C17H35COO) 2Cb two , Weight: 678 Third, the  Plastic impact modifier production process: stearic acid in hot water and lye saponification reaction with sodium stearate and cadmium nitrate metathesis reaction occurs generate cadmium stearate , after dehydration and air drying the finished product . Fourth, the physical and chemical properties : White light powder , density 1.28g/cm3, insoluble in water. Dissolved in hot ethanol and ether , absorb moisture in the air , the case is decomposed into stearic acid and corresponding cadmium salts .

PVC heat stabilizers breed some introductory

PVC primary stabilizers are those have a stabilizing effect when used alone, the compound and the secondary stabilizer is an invalid who used alone with the primary stabilizer compounds Shique synergistic effect. Some primary stabilizer or between certain to choose between the   Acrylic impact modifier main and auxiliary stabilizers act synergistically after use. First, the base of the  lead salt base lead salts are used in PVC earliest and most widely used of a heat stabilizer, alkaline, and it could be heated with PVC, HCl produced REACTED stability. From toxicity, stain resistance and product transparency point of view, lead salt is not ideal. But its stabilizing effect is good, inexpensive, it is still used extensively for cheap PVC extrusion and calendered products. Because it has excellent electrical properties and low water absorption, the PVC is widely used as electrical insulation products, albums and foam stabilizers. 1.1, tribasic lead sulfate  oxidized PE WAX (also known as tribasic lead sulfate) white powder, specific gravity 7.10, sweet, toxic; hygroscopic, non-flammable and corrosive. Insoluble in water, but soluble in hot ammonium acetate, wet decomposition of the light will change color. Index 2.1, and used as electrical insulation products stabilizer. 1.2 Dibasic lead phosphate which is a fine needle-like crystalline powder; specific gravity 6.1, sweet and toxic; 200 ℃ or so into a gray-black, 450 ℃ or so turns yellow. This product is not soluble in water and organic solvents, soluble in hydrochloric acid. Refractive index 2.25, with an antioxidant effect, is an excellent weather resistance stabilizers. Second, the metal soaps metal soaps also a widely used class of PVC heat stabilizer. In carboxylic acid barium, cadmium carboxylate, zinc carboxylate, carboxylic acid, or a mixture of elemental calcium use. Its stabilizing effect is due to it in the beginning of PVC molecular chain decomposition of the place where esterification. Stabilizing effect and the strength of the metal ratio of metal soap, a carboxylic acid type, and the existence of such formulations phosphite, epoxidized oils, the antioxidant synergists. Including cadmium and zinc soap soap greatest stabilizing effect. 2.1 Lead stearate which is a fine powder, is insoluble in water, soluble in hot ethanol and ether. Heated and dissolved in an organic solvent, and then cooling a gum. Case of decomposition of stearic acid and the corresponding lead salts, easy to damp. Has good lubricity, low melting point and that it has the excellent dispersibility. 2.2,2 - ethyl acetate, lead is soluble solvents and plasticizers. Often dubbed 57-60% mineral oil or plasticizer was sold. Widely used in foam blowing agent azodicarbonamide activator. 2.3 Lead salicylate which is a white crystalline powder, specific gravity 2.36, refractive index 1.76. Both PVC heat stabilizers and light stabilizers. 2.4, tribasic lead stearate is a white powder, specific gravity 2.15,280-300 ℃ decomposition, the case of high temperature above 100 ℃ caking. Soluble in ether, poisonous, non-flammable and corrosive. Refractive index of 1.60. This product is good lubricity, good light stability, widely used in PVC formulations title. 2.5, dibasic lead phthalate white fine crystalline powder, specific gravity 4.5. Insoluble in common solvents. This product is weak, and its base portion and easy carbonation. Refractive index of 1.99. When a formula contains a plasticizer easily saponifiable stabilizing effect than tribasic lead sulfate. 2.6, three maleate salt of lead (tribasic lead maleate) yellowish fine powder, specific gravity 6.0, refractive index 2.08, toxic, non-flammable and corrosive, with good color stability, and eliminate unstable diene structure effect. 2.7, barium stearate fine white powder, barium content 19.5-20.6%, the proportion of 1.145, melting point 225 ℃ or more. Insoluble in water, but soluble in hot ethanol. Was heated and dissolved in an organic solvent, after cooling into jelly. Case of decomposition of stearic acid and the corresponding barium salt, easy to damp. Sulfur contamination must be avoided for the selection of the heat stabilizer is used when processed under high temperature lubricant. 2.8, Osmanthus barium
2.9, ricinoleic acid, which is a kind of barium yellow-white powder, mp l16-124 ℃, enabling products to obtain good transparency stabilizer. 2.10, a white fine powder cadmium stearate, cadmium content 16.5-17.5%, insoluble in water, soluble in hot ethanol, heated and dissolved in an organic solvent, a jelly after cooling, in case decomposed into stearic acid and the corresponding cadmium salt, easy to damp. Is required to have good transparency PVC heat and light stabilizers. 2.11, cadmium ricinoleate which is a white powder, mp 96-104 ℃, both heat and light stabilizers 2.12, calcium stearate fine white powder, insoluble in water, soluble in hot ethanol and ether. Case of decomposition of stearic acid and corresponding calcium salt, easy to damp. Is a non-toxic PVC stabilizers and lubricants. Generally not used alone, but often with soap zinc, magnesium soap or vice epoxy stabilizer used in conjunction. 2.13, castor calcium is a white powder, melting point 74-82 ℃, PVC with a non-toxic stabilizers. 2.14, zinc stearate fine white powder, insoluble in water, soluble in hot ethanol, turpentine, benzene and other organic solvents. Was heated and dissolved in an organic solvent, after cooling a gum. Case of decomposition of stearic acid and the corresponding zinc, easy to damp. Is a non-toxic PVC stabilizers and lubricants. 2.15, magnesium stearate white powder, specific gravity 1.07, melting point of pure 85 ℃, industrial mp l08-115 ℃. Slightly soluble in water, soluble in hot ethanol, the case of decomposition of stearic acid and magnesium. This is a non-toxic PVC stabilizers and lubricants, but also phenol and urea formaldehyde resin lubricant. Third, the composite stabilizer 3.1, liquids and liquid barium cadmium, barium cadmium zinc composite stabilizer such composite stabilizer is mainly used for the processing of soft PVC products, the basic components include: (a) barium salt - can be alkyl barium phenol 2 - ethylhexanoic acid, barium laurate, barium, barium benzoic acid and substituted benzoic acid, neodecanoic acid and barium. Barium salt complexes accounted 6-7% salt with cadmium ratio is about 2:1.32 (as metal, by weight, the same below). (2) cadmium salts - can be 2 - ethylhexanoic acid, cadmium laurate, cadmium, cadmium oleate, phenyl and substituted benzoic acid, cadmium, cadmium naphthenate, neodecanoate, and cadmium. Cadmium salt complexes about 3-4%. (3) zinc salt - may be 2 - ethylhexanoate, zinc laurate, zinc naphthenate, zinc neodecanoate, benzoic acid and substituted benzoic acid zinc. Accounts for the composite zinc 0.5-1%. (4) phosphite - may be triphenyl phosphite, diphenyl phosphite, an octyl diphenyl phosphite, a decyl phosphite, tris (nonylphenyl), etc. In the phosphite complexes about 15-20% (by weight), as a chelating agent. (5) Other - include minor amounts of 2,6 - tert-butyl-p-cresol, bisphenol A, nonylphenol and other phenolic antioxidants and ultraviolet absorbers, and a liquid paraffin, white oil, diesel oil, spindle oil mineral oil as solvent, and the need small amount of antifoaming agent such as a higher alcohol. Liquid barium cadmium zinc composite stabilizer because different composition, properties are also different. But is generally pale yellow to yellow clear liquid, specific gravity 0.95-1.02 at room temperature, the viscosity of less than 100 cps, freezing point at -15 ℃ or so. Liquid Ba Ba Cd, Zn and Cd, and similar liquids, has excellent heat and light stability; initial coloration is small, good  titanium dioxide anatase transparency and color stability. Their stabilizing effect than solid composite soaps, therefore, may reduce the amount of, usually 2-3 parts, the dust does not occur poisoning, and completely dissolved in the plasticizer in the general, good dispersion, small tendency to precipitate. Wherein the liquid barium cadmium zinc early color than the liquid barium cadmium smaller. 3.2 Liquid Ba-Zn complexes are generally pale yellow to yellow-brown oily liquid, specific gravity of 1.0-1.1 at room temperature, good heat resistance, pollution from sulfur, with an epoxy plasticizer and used to increase the stabilizing effect on the hair foam agents are activation. 3.3, non-toxic liquid calcium zinc complexes of liquid calcium zinc stabilizer main ingredients are calcium stearate, castor oil, calcium, zinc stearate, castor oil, zinc and epoxy soybean oil, ultraviolet absorber. Liquid calcium zinc stabilizer off
Agents are generally more soluble in organic solvents used fewer carbon fatty acid calcium salts and zinc salts. Because of different compositions, varied in nature, usually pale yellow to yellow clear oily liquid at room temperature under a specific gravity of 1.0 to 1.05. It is non-toxic PVC stabilizer, mainly for food packaging films, containers, and foam stabilizer for leather. Fourth, organotin stabilizers organotin stabilizers are various carboxylic acids derivatives of tin and tin mercaptide, the main products are dibutyl tin and dioctyl tin compounds, which Dioctyltin countries as being more toxic stabilizer be used. Organotin primarily to stabilize rigid PVC products, especially those that require a superior transparency and thermal stability of the product. Of course, soft products can be stably, but because of its price is more expensive, it is generally not used. 4.1, dibutyl tin dilaurate is a pale yellow clear liquid, dissolved in a plasticizer and all industrial solvents, the toxic materials. It is the oldest organotin species, has excellent lubricity, transparency and weather resistance, resistance to sulfur pollution, but the heat resistance is poor. As the main products, soft transparent stabilizers, rigid transparent products used as lubricants. 4.2, dibutyltin maleate which is a white amorphous powder, melting and volatile vary with the degree of polymerization, between about 100-140 ℃. This product is toxic, a tear. Primarily used for high softening point and high impact strength rigid transparent products. Because no lubrication so often and dibutyl tin and used, the amount of 0.5-2. 4.3, bis (monobutyl maleate), dibutyltin light yellow transparent liquid, non-toxic (to allow the amount of 3 parts or less). This product has good weather resistance, transparency, and thermal stability preventing coloration does not occur sulfur pollution, commonly used in transparent PVC rigid products, the amount of 2.0-4.0 parts. 4.4, bis (isobutyl thioglycolate), di-n-octyl tin which is a pale yellow liquid, insoluble in water, soluble in esters, ethers, alcohols, aliphatic and aromatic hydrocarbons, chlorinated hydrocarbons and the major types of plasticizer . It is the main tin mercaptide species, the most commonly used one non-toxic organotin stabilizers for rigid transparent PVC (2-3 copies) and soft transparent PVC (1 copy). The disadvantage is poor weather, the smell would sulfur pollution, no lubrication. In addition, because it contains an ester group, so there is a certain degree of plasticization.

PVC lubricants - PVC lubricants Introduction

Application: PVC lubricants in the dibasic lead phosphite  plastics industry mainly used as mold release agents , plasticizers , antistatic agents , especially suitable for plastic foam products, anti-shrinkage agent. In the  production of PVC products as an internal lubricant , and alkyd resin can be used as a modifier , plasticizer nitrocellulose . Lubricant in the plastics processing flowability of the blowing agent  resin to improve the releasability and products to prevent the machine or mold adhesion and internal defects . General increase in the molding cavity or onto the surface . Common lubricants are fatty acids and their salts, long chain aliphatic hydrocarbons. The mechanism of action based lubricants can be divided into external lubricant and internal lubricant.
( 1) External Lubricant: The lubricant for molding resin compatibility is poor , so commonly used in the molding machine or the mold, it forms a lubricating layer between the resin , to facilitate resin flow and mold release products such as paraffin .
( 2 ) an internal lubricant : Lubricant such good compatibility with the resin , often incorporated into the yellow iron oxide  resin , reduce the melt viscosity of the resin , to improve their mobility . Such as butyl stearate , lead stearate . Stearic acid salts as well a lubricant is effective stabilizers.

pigments basic classification

From the chemical composition of the pigment can be divided into inorganic and organic pigments into two categories, its origin can be divided into natural pigments and synthetic pigments. As a source of natural mineral pigment, such as: cinnabar, clay, realgar, malachite green and heavy calcium carbonate folk painting paint
, Wollastonite, barite powder, talc, mica, kaolin, etc. Biological as a source, such as those from animal: Carmines, natural scale powder; derived from plants are: Garcinia, Alizarin red, indigo and aluminium hydroxide  so on. Synthesized by synthetic pigments, such as titanium dioxide, lithopone, lead, chrome yellow, iron blue and other inorganic pigments and Big Pink, even yellow, phthalocyanine blue, quinacridone organic pigments. Function of the pigment to the classification, such as anti-rust pigments, magnetic pigments, luminescent pigments, pearlescent pigments, electrically conductive pigments. In color, it is convenient and the methods used. This pigment can be divided into white, yellow, red, blue, green, brown, purple, black, regardless of their origin or chemical composition. The famous "Colour Index" (ColorIndex) is used to color classification methods: If the pigment into pigment yellow (PY), pigment orange (PO), Pigment Red (PR), Pigment Violet (PV), Pigment Blue (PB) , Pigment Green (PG), Pigment Brown (PBr), pigment black (PBk), pigment white (PW), metallic paint (PM) and other ten categories, the same number of color pigments are arranged according to the order, such as titanium dioxide as the PW- 6, lithopone PW-5, Lead Chrome Yellow PY-34, quinacridone PR-207, red iron oxide PR-101, Phthalocyanine Blue PB-15 and so on. In order to find the chemical composition, there is another structure number, such as titanium dioxide PW-6C.I.77891, phthalocyanine blue is PB-15C.I.74160, you can make the pigment manufacturers and users to identify the pigments listed The composition and chemical structure of the. Therefore, the pigment in the international import and export trade industry have been widely adopted, some of the domestic paint manufacturers also use this pigment international classification standards. Using color. Each color has a sign pigments, such as white epoxidation of soybean oil  as BA, red for HO, yellow for the HU ...... combined with the chemical structure of the pigment composition code and serial models, such as rutile titanium dioxide BA-01-03, chrome yellow HU-02-02, red iron oxide HO-01-01, lithopone BA-11-01, toluidine red HO-02-01, BGS phthalocyanine blue LA-61-02 and so on.
The pigment contained in the compound according to the classification categories: inorganic pigments can be broken down as oxides, chromates, sulfates, silicates, borates, molybdates, phosphates, vanadates, iron cyanate , hydroxides, sulfides, metal, etc.; organic pigment into the chemical structure of compounds according to azo pigments, phthalocyanine pigments, anthraquinone, indigoid, quinacridone, dioxazine pigments such as polycyclic, aromatic CH pigments and so on.
From the manufacturing point of view can be classified into the titanium pigments, iron pigments, chromium pigments, lead pigments, zinc pigments, metallic pigments, synthetic organic pigments, this classification method has practical significance, often PVC profile stabilizer  a system will on behalf of a professional production of the pigment industry.
From the application point to the classification can be divided into paint pigment, ink pigment, plastic pigment, rubber paint, ceramics and enamel pigments, pigment for cosmetic medicine, art with paint and so on. Various special pigments have some unique properties, in order to meet the application requirements. Pigment production plant can be targeted to professional users recommended a series of paint products.

PVC heat stabilizers tribasic acid leaden take process (a)

Because PVC heat stabilizers tribasic lead sulfate extraction, the process is more complex, factors affecting more detailed description of an article can not be and are hereby removed all the  n-butyl stearate details on this, give us representations about. Here to tell you the amount of coating under tribasic lead sulfate on the thermal stability. The amount of coating on the thermal stability time have a significant effect, as coating amount from 40% to 55%, thermal stability extended from 59 minutes to 73 minutes, that the thermal stability of the coated lead salt in the  potassium stearate coating at this stage proportional, with the coating increases, the thermal stability is slightly increased, from 73 minutes to 75 minutes, the growth rate slowed significantly. Subsequently, from the thermal stability as the coating amount hardly increases, when the coating amount to 50%, from the thermal stability has been reached after 71 minutes and tribasic lead sulfate heat stabilizer stabilization time 72 minutes already quite.
Of PVC stabilizer in the  plastic flame retardant capture HCl process, the diffusion process of closing, when the coating amount reaches the top coating, in the form of a stabilizer in the best condition to capture HCl HCl its ability to capture even more than tribasic lead sulfate, when more than the optimum amount, many of the stabilizing agent is masked in the surface stabilizer, and the surface after the formation of PbCl2 capture HCl salt stabilizing function and thus can not, therefore, even if increasing the amount of tribasic lead sulfate, the stable Function difficult to continue to grow.

toxic PVC heat stabilizers Research Status and Development Trend

Polyethylene, polyvinyl chloride PVC is second only to the world's second-largest synthetic resin production over 90,000, however, PVC there are some difficult to overcome the shortcomings of poor thermal stability which was most prominent. PVC due to poor thermal stability, softening temperature and decomposition temperature difference is small, has caused great difficulties to the process, so the machining process must be a  flame retardant certain amount of heat stabilizer in order to improve its thermal stability. Currently, the largest amount of lead salt heat stabilizer. In building a harmonious society and to ensure sustainable development in mind, people's awareness of environmental protection and health gradually strengthened, therefore, low toxicity, no pollution, has become a complex and efficient PVC heat stabilizers direction of development.
Analysis of the thermal stability tribasic lead sulphate  of PVC resin
PVC imminent completion of the laboratory synthesis, is one of the earliest synthetic thermoplastics, with difficult to burn, good mechanical properties, low prices, abundant source of raw materials, synthetic process maturity and other characteristics, widely used in construction, telecommunications, transportation, electronics, chemicals, packaging and other industries. PVC heat stabilizer to heat or high-energy radiation, such as ultraviolet light "effect occurs under the autocatalytic reaction hcl off, the PVC foaming board stabilizer  thermal decomposition mechanism generally believed that there are three kinds. Oxygen environment of the free radical mechanism; (2) ion mechanism under a nitrogen atmosphere; (3) of the single vacuum molecular mechanisms that affect the thermal decomposition pvc chain structure is the main factor, means branched, double, allyl chloride, head structure of conjugated double bonds and a molecular weight etc. "effect; addition, oxygen, HCL additives and other external factors also have an impact.

Novel aluminum hydroxide

New varieties of aluminum hydroxide
Development of new varieties, including: (1) increasing the surface area of ??the aluminum hydroxide particles and ultra fine micronized, water vapor partial pressure of the particle surface decreased, aluminum hydroxide can be improved heat resistance and mechanical properties of the flame-retardant effect significantly enhanced, there are tests showed the same distribution

Parties with an average particle size of the aluminum hydroxide 5μm, the oxygen index of 28, particle size <1μm, the oxygen index of 33. (2) thermal decomposition of aluminum hydroxide and the reaction temperature of the material, can be synthesized in between the thermal decomposition temperature of new varieties, such as aluminum hydroxide and sodium carbonate

Eutectic at 300 ~ 350 ℃ decomposition release water and carbon dioxide, hydrogen chloride and smoke have a stronger inhibitory effect is PVC, polyolefins excellent flame retardant. (3) reducing the insoluble aluminum hydroxide ions especially sodium oxide content, the mass fraction of less than 0.2%.
New varieties of improved surface
Generally aluminum hydroxide with a silane coupling agent, a titanate coupling agent and stearic acid (salt) such as a surface treatment, this has just started domestic, foreign countries have further special functions for a new aluminum hydroxide surface modifier development.
Inorganic synergist new varieties. A small amount of flame retardant synergist of aluminum hydroxide filler can significantly improve performance, such as inhibiting dripping, to improve the mechanical properties. And aluminum hydroxide can be a synergistic effect of a wide range of inorganic flame retardant synergist, mainly metal oxide

Zinc borate compound and a phosphorus compound (red phosphorus, phosphate), a silicon-based compound, a metal nitrate (nitrate, copper nitrate, silver), ammonium polyphosphate, etc..