plastics processing aids

Global plastics industry is growing very rapidly, with an annual growth

rate of 4% to 6%, exceeding the growth rate of global GDP. The main reason

is that this growth to continue in the aluminum hydroxide  alternative plastic materials

traditional materials such as metal, wood, and minerals. In fact, various

additives in the resin for the successful application of plastic materials

are of great help. In the use of various types of additives to the polymer

impact modifiers and processing aids for the polymer to provide the most

unique and most valuable superior performance, but also improve the

processing performance of the product. Toughening treatment, rheology

control, beautiful appearance, processing performance, and economic factors

that are important to the nature of the property. Many of these additives

have been used for many years, after a long development derived from a wide

range of varieties. A major reason for this situation is the emulsion

polymerization process varied, which makes scientists continue to design

suitable polymer components, polymer structure, polymer morphology and

molecular weight / weight distribution. Low cost of production, and the

resulting product is easy to separate the iron oxide  emulsion, therefore, in the

commercial production of emulsion polymerization is very attractive.

In 1956, a first polymer additives for emulsion polymerization technique

was developed, which is a methacrylate - butadiene - styrene (MBS) prepared

as core-shell impact modifier. Subsequent to a variety of acrylic

processing aid and an acrylic impact modifier. Initially, these additives

are primarily used to improve the polyvinyl chloride (PVC) processability

and toughness. And processing aids for PVC mainly to promote fusion of PVC,

to enhance the melt strength, to improve the dispersion properties and

surface quality. High molecular weight PVC foam processing aid is an

important component. Means of processing aids, PVC foams can be obtained in

a more homogeneous foam structure, and to reduce the breakdown of closed

cell foam density will be lower. Act as a lubricant processing aids can

effectively prevent the molten plastic bonded to the metal surface to

improve the surface quality of products, improve production efficiency.

There are many applications of plastic materials is very limited, because

they either do not have the required physical properties, or its processing

performance is very poor, processing aids, is used to enhance the plastics

melt processing, increase production, reduce parking maintenance time and

provide better quality products.  the development of the first commercial production of processing aids product

that is used for the production of rigid PVC. After this, this

unprecedented technology will  chromium oxide soon be known to the industry, and thus

triggered a boom in the production of PVC industry. Since the 1980s

onwards, this research and development work began against other

thermoplastic materials and polymer blends product unfolded. Most of the

processing aid is generally added in PVC, and in other thermoplastics

processing aids used in little (only 0.5% to 5%), but in spite of these

processing aids able to significantly improve the processing performance,

while not affect other applications significantly affect performance.

According to the type of functionality, processing aids can be divided into

flux, melt rheology modifiers, lubricants and dispersing accelerator. In

fact, each type of processing aids and have more than one effect. Any one

processing aid functionality and application results to be dependent on its

chemical composition, the polymer structure, molecular weight and type of

the polymer matrix.