For the success of the polyethylene wax for aqueous paints and aqueous inks, often oxidized polyethylene wax, having a carboxyl group and a polar group to group. However, the oxidation process also makes polyethylene wax degradation, chain scission reduces the degree of crystallinity, its performance is dropping lower melting point, hardness decreased. This reduces the effect as a wax: anti-adhesion, smoothness, abrasion.
The oxidized polyethylene wax with two or more monovalent or divalent metal ion Mx, such as calcium, magnesium, aluminum, cerium, other appropriate cross-linking:
We want to get both hydrophilic and Stabilizers for pipe smooth, abrasion resistance.
Dispersing method: deionized water, a surfactant, heated to boiling, to be emulsified into the wax powder, under strong stirring and then rapidly cooling to room temperature, adjusted with ammonia Ph value between 7-8. The wax dispersion can be easily dispersed in an aqueous ink, without precipitation, without float.
Saponification wax powder is also good to use as emulsifier effect of ammonium perfluorooctanoate and physical contact.
Two
Micronized wax aqueous dispersion for waterborne coatings, water-based inks, textile finishing, leather modifications and other fields.
Application of results:
1, extinction, antiblocking
Especially the oxidized polyethylene wax powder Mx saponified aqueous polyethylene wax dispersion for paints and inks have a significant effect extinction. 2-5% of the amount of film 60 ° gloss reduction of 20%. Smooth, anti-adhesion effect is obvious.
2, wear
Saponified polyethylene wax after partial crosslinking, molecular weight, crystallinity, improved hardness, lubricity both, but the end of the dynamic coefficient of friction coating to zinc stearate reduce anti-friction capacity doubled.
3, feel
The coating soft touch, smooth and comfortable.
4, anti-aging and promote the solidification
Saponification wax coating can absorb calcium aging free radicals, from delaying the effects of aging coating.
Cerium has a variable coordination number Azodicarbonamide and the remaining valence, because the 4f orbitals, located 6s, 5p, 5d inner orbit, its bonding capacity is weak, it is characterized by pro-dry agent of this nature in the cured coating from the promotion of cross-linking process and accelerate the curing effect.
impact modifier
2013年12月30日星期一
2013年12月29日星期日
Describes the advantages and disadvantages of plasticizer intermittent production
In continuous production , the esterification reactor can be divided into a tower reactor and stepped reactors in series two categories. When using the optional tower acidic esterification catalyst is more reasonable ; When using non-acidic catalyst or without a catalyst , the Calcium stearate reaction mixture was due to stay longer , so the use of a stepped tandem reactors more appropriate.
Advantages: 1 ) less investment, quick construction 2 ) easy to switch products , produces a variety of plasticizers
3) The technology is simple, easy to meet the quality of personnel shortcomings : 1 ) large fluctuations in product quality , less stable
2) The technology behind the labor intensity 3 ) high energy and material consumption
Intermittent production is suitable for small-scale production of a variety of plasticizers , less investment and quick . Continuous production process
Since the DOP, DBP plasticizer in great demand , and therefore DOP, DBP -based continuous production process has been widely used , currently China's largest DOP -line production capacity of 50,000 tons / year, the largest single-line production capacity of 2 DBP tons / year. In continuous production , the esterification reactor can be divided into a tower reactor and stepped reactors in series two categories. When using the optional tower acidic esterification catalyst is more reasonable ; When using non-acidic catalyst or without a catalyst , the reaction mixture was Chrolinated polyethylene due to stay longer , so the use of a stepped tandem reactors more appropriate. Plasticizer phthalate plasticizers largest amount , about 80% plasticizer production, mainly in the country such plasticizer dioctyl phthalate (DOP) and phthalic dibutyl (DBP) based.
( 1 ) and the resin has good compatibility ; high ( 2 ) plasticizing efficiency ; ( 3 ) of the thermo-optical stability ; ( 4 ) low volatility ; ( 5 ) migration of small ; ( 6 ) water , oils and organic solvents extraction ; ( 7 ) good low temperature flexibility ; ( 8 ) flame retardant ; ( 9 ) electrical insulation ; ( 10 ) is colorless, odorless , non-toxic ; ( 11 ) anti- fungal good ; ( 12 ) anti- pollution good ; ( 13 ) plastisol viscosity stability ; ( 14 ) cheap.
Plasticizer phthalate plasticizers largest Titanium dioxide rutile amount , about 80% plasticizer production, mainly in the country such plasticizer dioctyl phthalate (DOP) and phthalic dibutyl (DBP) based. Due to limitations of the source material alcohol , heptyl phthalate (DHP), di-iso -decyl phthalate (DIDP), di-iso -octyl phthalate (DIOP) , excellent performance varieties, production is not large .
Production DBP five continuous esterification process , and, dealcoholization , bleaching, filtering operations are continuous .
Advantages: 1 ) less investment, quick construction 2 ) easy to switch products , produces a variety of plasticizers
3) The technology is simple, easy to meet the quality of personnel shortcomings : 1 ) large fluctuations in product quality , less stable
2) The technology behind the labor intensity 3 ) high energy and material consumption
Intermittent production is suitable for small-scale production of a variety of plasticizers , less investment and quick . Continuous production process
Since the DOP, DBP plasticizer in great demand , and therefore DOP, DBP -based continuous production process has been widely used , currently China's largest DOP -line production capacity of 50,000 tons / year, the largest single-line production capacity of 2 DBP tons / year. In continuous production , the esterification reactor can be divided into a tower reactor and stepped reactors in series two categories. When using the optional tower acidic esterification catalyst is more reasonable ; When using non-acidic catalyst or without a catalyst , the reaction mixture was Chrolinated polyethylene due to stay longer , so the use of a stepped tandem reactors more appropriate. Plasticizer phthalate plasticizers largest amount , about 80% plasticizer production, mainly in the country such plasticizer dioctyl phthalate (DOP) and phthalic dibutyl (DBP) based.
( 1 ) and the resin has good compatibility ; high ( 2 ) plasticizing efficiency ; ( 3 ) of the thermo-optical stability ; ( 4 ) low volatility ; ( 5 ) migration of small ; ( 6 ) water , oils and organic solvents extraction ; ( 7 ) good low temperature flexibility ; ( 8 ) flame retardant ; ( 9 ) electrical insulation ; ( 10 ) is colorless, odorless , non-toxic ; ( 11 ) anti- fungal good ; ( 12 ) anti- pollution good ; ( 13 ) plastisol viscosity stability ; ( 14 ) cheap.
Plasticizer phthalate plasticizers largest Titanium dioxide rutile amount , about 80% plasticizer production, mainly in the country such plasticizer dioctyl phthalate (DOP) and phthalic dibutyl (DBP) based. Due to limitations of the source material alcohol , heptyl phthalate (DHP), di-iso -decyl phthalate (DIDP), di-iso -octyl phthalate (DIOP) , excellent performance varieties, production is not large .
Production DBP five continuous esterification process , and, dealcoholization , bleaching, filtering operations are continuous .
2013年12月26日星期四
Fireproof cement foam insulation board dedicated calcium stearate successful development
Cement foam board dedicated calcium stearate , also known as the cement foam insulation board dedicated calcium stearate , fireproof cement foam insulation board dedicated calcium stearate , A grade cement foam insulation board dedicated calcium stearate ( hereinafter referred to as calcium stearate ) , the manufacturers of him not the same name , but the play was really a role in the fire cement foam insulation board production roughly
Calcium stearate is mainly used in cement tribasic lead sulfate foam insulation board made fireproof foam stabilizer , curing agent, water repellent ( hydrophobic agent ) . Currently the manufacturers for the production of cement foam insulation board fire recipe varies. Useful sulfur aluminate cement , ordinary Portland cement are also useful for different cement per cubic meter of production of fire insulation board quality and amount of calcium stearate is not like.
Foam stabilizer : calcium stearate effectively prevent fire insulation board was up too high and the lack of material and keep the aperture fine, uniform cell size did not make cement foam PVC stabilizer for wire insulation board does not collapse in the foam, foam completed after the semi-finished table no holes or cracks.
Curing agent: calcium stearate itself there are a lot of calcium , which can effectively increase the intensity of fire insulation board firmly to prevent fire insulation panels fold out powder , produced by calcium stearate fire insulation board with calcium ions in the late the chemical reaction will be more firm , more rugged .
Waterproofing agent : calcium stearate produced by the fire insulation board materials, basically when water does not absorb moisture during transport can reduce transportation costs, saving manpower and material resources in the installation phase.
According to tests, produced by calcium stearate fire insulation board than simply initiator and other small fireproof one pack stabilizer insulation board materials produced with stearic acid or AC, both in appearance , strength, water resistance is much better, stearic calcium can significantly improve product quality, enhance the corporate brand .
Calcium stearate is mainly used in cement tribasic lead sulfate foam insulation board made fireproof foam stabilizer , curing agent, water repellent ( hydrophobic agent ) . Currently the manufacturers for the production of cement foam insulation board fire recipe varies. Useful sulfur aluminate cement , ordinary Portland cement are also useful for different cement per cubic meter of production of fire insulation board quality and amount of calcium stearate is not like.
Foam stabilizer : calcium stearate effectively prevent fire insulation board was up too high and the lack of material and keep the aperture fine, uniform cell size did not make cement foam PVC stabilizer for wire insulation board does not collapse in the foam, foam completed after the semi-finished table no holes or cracks.
Curing agent: calcium stearate itself there are a lot of calcium , which can effectively increase the intensity of fire insulation board firmly to prevent fire insulation panels fold out powder , produced by calcium stearate fire insulation board with calcium ions in the late the chemical reaction will be more firm , more rugged .
Waterproofing agent : calcium stearate produced by the fire insulation board materials, basically when water does not absorb moisture during transport can reduce transportation costs, saving manpower and material resources in the installation phase.
According to tests, produced by calcium stearate fire insulation board than simply initiator and other small fireproof one pack stabilizer insulation board materials produced with stearic acid or AC, both in appearance , strength, water resistance is much better, stearic calcium can significantly improve product quality, enhance the corporate brand .
2013年12月23日星期一
What is the trend stabilizer
Types and tend to be stable and stabilizing agent for a wide variety of different combinations , in order to better understand its performance and features , must be classified . In several existing classification methods, the most obvious is to be classified according to their chemical composition , followed by its thermal stability, light stability , electrical properties and a hard or soft transparent or opaque article , toxic or non-toxic , and so on various occasions classification. Now titanium dioxide rutile the main types of stabilizers are as follows : 1 , lead-based stabilizers lead-based stabilizers due to low prices , good stabilizing effect , and therefore is the most widely used stabilizer , which is characterized by : ① electric superior performance, a large number of used in manufacturing insulation products ; ② HCI reaction due to the formation and stability , suitable for the manufacture of transparent articles ; ③ small water absorption, suitable for use in humid environments , because it is toxic and therefore not suitable for low or non-toxic products, In addition, it has the effect of sulfide contamination . Lead stabilizers are the following: ( 1 ) tribasic lead sulfate (3PbO · PbSO4 · H2O): is the maximum amount of use of a stabilizer , for HCl absorption force, shading good , so resistance weather is good, the most suitable for soft and hard in the extrusion process also applies to products with high electrical performance requirements . ( 2 ) Dibasic lead phosphite (2PbO · PbHPO3 · 1/2H2O): It is slightly lower than the absorption of HCl tribasic lead sulfate , but it is heat-resistant , good anti- light performance, UV light has shielding effect, and has antioxidant properties , are particularly useful in the paste PVC , but more than 300 ° C, the article is easy to produce bubbles, it is not appropriate for the processing of high temperature applications. It is used with the appropriate lubricant and good initial stability . ( 3 ) white lead [ Dibasic lead carbonate , 2PbCO3 · Pb (OH) 2]: It is also well- HCl absorber , various properties are good mainly for general soft rolled products , the cable sheath , but not suitable for use in high temperature or longer processing times of the occasion, because the gas leaving it prone to foaming products . ( 4 ) Dibasic acid Lead: good heat resistance , suitable for heat-resistant products , but because black iron oxide it has the acid group, therefore when used phthalate ester plasticizers , good compatibility , light stability is also good , currently mostly used in high-temperature products . Further, in the production of PVC foam products with the azo dimethylamine , good foamability . ( 5 ) Dibasic Lead Stearate : such stabilizers will not melt at normal operating temperatures , good lubricity , it is generally not as easy to bloom soaps , generally regular and tribasic lead sulfate or dibasic lead phosphite and use, its heat resistance, electrical insulation is good, dibasic lead stearate and lead stearate and use, when appropriate proportion of time to get closer to transparent products. ( 6 ) lead stearate : good thermal stability , the ability to inhibit the initial color , widely used in extrusion, calendering and molded articles . It has good lubricating properties, but plasticizing poor performance, thus limiting its use proportion ( generally the amount of 0.5 to 1.0 parts ) in the recipe . ( 7 ) co-precipitated silica lead silicate : This stabilizer at high temperatures and for a long time , have a good organic pigments thermal stability , light stability , can be used for spare parts or heat-resistant transparent cable . Its disadvantage is hygroscopic and poor dispersion , care must be taken when using . ( 8 ) tribasic lead maleate : This is a very good heat and light stabilizers , ultraviolet shielding properties, can also get translucent products. The use of chlorine or chlorinated polyvinyl chloride plasticizer occasions , adding tribasic lead maleate , you have better stability.
2013年12月22日星期日
Status and trends of non-toxic PVC heat stabilizers
Status and trends of non-toxic PVC heat stabilizers
Polyethylene, polyvinyl chloride PVC is second only to the world's second-largest synthetic resin production over 90,000 , however , PVC , there are some shortcomings difficult to overcome , including poor thermal stability 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 process Aluminum hydroxide must be added a certain amount of heat stabilizers to improve its thermal stability. Currently , lead salt is the largest amount of heat stabilizer. In building a harmonious society and ensure the sustainable development of the premise that people 's awareness of environmental protection and health gradually strengthened, therefore , low toxicity , no pollution, has become complex and efficient development direction of PVC heat stabilizers .
Thermal stability of PVC resin
PVC is one of the oldest plastic additive synthetic thermoplastics , has difficulty burning, good mechanical properties, low prices, abundant sources of raw materials , synthetic mature technology , which is widely used in construction, telecommunications , transportation, electronics, chemicals , packaging and other industries. PVC heat stabilizers in the heat or subjected to high energy radiation, such as ultraviolet light , "the impact of de- hcl autocatalytic reaction occurs , the thermal decomposition mechanism is generally believed that there are zinc stearate three kinds of radical mechanism oxygenated environment ; . ( 2 ) ion mechanism under a nitrogen atmosphere ; main factors ( 3 ) single molecular mechanism under vacuum conditions affect the thermal decomposition is pvc chain structure , refers to a branched , double, allyl chloride, head structure and molecular weight of conjugated double bonds etc. "effect ; addition, oxygen , HCL additives and other external factors also have an impact .
Polyethylene, polyvinyl chloride PVC is second only to the world's second-largest synthetic resin production over 90,000 , however , PVC , there are some shortcomings difficult to overcome , including poor thermal stability 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 process Aluminum hydroxide must be added a certain amount of heat stabilizers to improve its thermal stability. Currently , lead salt is the largest amount of heat stabilizer. In building a harmonious society and ensure the sustainable development of the premise that people 's awareness of environmental protection and health gradually strengthened, therefore , low toxicity , no pollution, has become complex and efficient development direction of PVC heat stabilizers .
Thermal stability of PVC resin
PVC is one of the oldest plastic additive synthetic thermoplastics , has difficulty burning, good mechanical properties, low prices, abundant sources of raw materials , synthetic mature technology , which is widely used in construction, telecommunications , transportation, electronics, chemicals , packaging and other industries. PVC heat stabilizers in the heat or subjected to high energy radiation, such as ultraviolet light , "the impact of de- hcl autocatalytic reaction occurs , the thermal decomposition mechanism is generally believed that there are zinc stearate three kinds of radical mechanism oxygenated environment ; . ( 2 ) ion mechanism under a nitrogen atmosphere ; main factors ( 3 ) single molecular mechanism under vacuum conditions affect the thermal decomposition is pvc chain structure , refers to a branched , double, allyl chloride, head structure and molecular weight of conjugated double bonds etc. "effect ; addition, oxygen , HCL additives and other external factors also have an impact .
订阅：
博文 (Atom)