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Plastic products gradually banned metal products

Release time:
2014-06-17
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[Abstract]:
In today's increasingly expanding plastics market, the plastics industry in the world is in a state of development. The world's plastic growth rate reached 4% to 6%, now has exceeded the global level

In today's increasingly expanding plastics market, the plastics industry in the world is in a state of development. The world's plastic growth rate reached 4% to 6%, now has exceeded the global level of GDP growth. Currently, in our lives, plastics have replaced metals, wood, minerals, etc. in many areas. The use of plastic products continue to improve, which makes the PVC industry continued to expand, technology is the key to ensuring product quality, we in the production and processing of PVC products, will use a variety of PVC processing aids products, PVC processing There are many types of additives: plasticizers, heat stabilizers, pigments, catalysts and more. The effect of different PVC processing aids on PVC is different. Polymer impact modifiers and processing aids provide the polymer with the most unique and valuable properties and the improved processability of its products, using a wide range of PVC processing aids. Toughening treatment, rheological properties control, appearance aesthetics, processing performance and economic factors are important properties of nature. Various of these PVC processing aids have been used for many years and have evolved a wide range of varieties over the long term. Due to the variety of emulsion polymerization processes for PVC processing aids, scientists are continually designing suitable polymer components, polymer structures, polymer morphology, and polymer molecular weight and molecular weight distribution.

Because PVC processing aids are inexpensive to produce and the resulting emulsion products are easy to separate, emulsion polymerization is very attractive in commercial production. In 1956, the first PVC processing aid for emulsion polymerization was developed. It is a core-shell impact modifier made from methacrylate-butadiene-styrene (MBS). What followed was various acrylic processing aids and acrylic impact modifiers. Initially, these additives were mainly used to improve the processability and toughness of polyvinyl chloride (PVC). For PVC processing aids is mainly to promote the melting of PVC, improve melt strength, improve dispersion properties and surface quality. Ultra-high molecular weight processing aids are an important part of foamed PVC. With processing aids, PVC foams provide a more uniform foam structure, reduce the collapse of the blisters and lower the foam density. From the lubrication of the processing aid can effectively prevent the molten plastic bonded to the metal surface, improve product surface quality and improve production efficiency.

There are many plastic materials that have a limited range of applications because they either do not possess the required physical properties or their processing properties are very poor. PVC processing aids are used to enhance the melt processability of plastics, increase yields and reduce Parking maintenance time and provide better quality products. In the 1950s Rohm and Haas pioneered the first commercially available processing aid product to be used in rigid PVC production. Since then, this unprecedented technology has quickly become familiar to the industry and has given rise to the production craze in the PVC industry. Since the 1980s, such research and development efforts have begun to be targeted at other thermoplastics and polymer blends. Most processing aids are usually added to PVC, whereas processing aids are rarely used in other thermoplastics (0.5% to 5%), but nevertheless, these processing aids can significantly Improve processing performance, while not having a significant impact on other application performance. Depending on their functionality, processing aids can be classified as fluxes, melt rheology modifiers, lubricants and dispersion promoters. In fact, each type of processing aids have more than one effect. The functionality and effectiveness of any processing aid depends on its chemical composition, polymer construction, polymer molecular weight, and the type of polymer matrix.

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