ASA PW-997 ASA PW-997

ASA PW-997

ASA塑料ASA是由苯乙烯、丙烯腈和丙烯酸酯类橡胶体共聚合而成。在技术上而言，ASA不仅维持了ABS之主要特性，并结合PMMA耐候之优点，使得产品之应用上可延伸至户外之用途。ASA分为：一般级、押出级和耐热级。

It is a new type of synthetic fiber. The product is mainly made of polypropylene and polyethylene as raw materials, synthesized through special processing and combined with steel fiber and fiber.

Polypropylene fiber

The advantages of plastic synthetic fibers are mainly used to replace the welded metal mesh and steel fiber in the concrete face structure.

The role of plastic steel fiber

Steel fiber is a kind of application in building engineering, high strength fiber concrete toughness and resistance control, can replace the traditional steel net, steel fiber, and the construction cost is more economical; operation is convenient and time-saving: new material is enhanced and has wide application prospect in concrete. The plastic steel fiber is made of polypropylene modified polymer as the main raw material, which is produced by special technology. It is a rough surface with clear outline and coarse fiber: diameter, thickness, fiber length, wave shape, tensile strength, modulus of elasticity, acid and alkali resistance, and steel bar.

The external shape of steel fiber, the function of steel and steel fiber, and the advantages of the synthetic soft fiber。

Propylene film

PP production in China will increase greatly in the next few years, but production is still in short supply. China has become the largest net importer of polypropylene in the world. However, because of the rapid growth of domestic output, the dependence on imports has generally declined. In the next few years, the apparent consumption will remain high, the import volume will increase and the polypropylene industry has a broad prospect in China in the next few years.

Production process

It is polymerized by vinyl acetate in the presence of acetic acid. The degree of polymerization is 250~600. After polymerization, the residual trace catalyst (usually peroxide), monomer and / or solvent are removed by vacuum drying, steam stripping, washing or combined treatment.

In the presence of acetic acid, benzoyl peroxide is used as initiator, vinyl acetate is bulk polymerized, or polyvinyl alcohol is used as dispersant, and the solution polymerized 2 to 6h at 70~90 degree temperature in the solvent. The product is 250~600.

Variety and model

Isotactic polypropylene, random polypropylene and syndiotactic polypropylene

Polypropylene molecules contain methyl group. They are divided into isotactic polypropylene (isotactic polyPropylene), atactic polypropylene (atactic PolyPropylene) and syndiotactic polypropylene (syndiotatic Polypropylene) according to their methyl positions. The methyl arrangement is called the isotactic polypropylene on the same side of the main chain. If methyl is distributed orderly on both sides of the main chain, it is called atactic polypropylene. When methyl is alternately arranged on both sides of the main chain, it is called syndiotactic polypropylene. The general production of polypropylene resin, the content of isotactic structure (called isotacticity) is about 95%, the rest is random or syndiotactic polypropylene. The polypropylene resin produced in our country is classified according to the melting index and the additives added.

Random polypropylene is a by-product of the production of isotactic polypropylene. The isotactic polypropylene is produced in the isotactic polypropylene production, and the isotactic polypropylene is separated from the random polypropylene by separation.

Random polypropylene is a high elastic thermoplastic material, it has good tensile strength. It can also be vulcanized like ethylene propylene rubber.

Production method

(4) chemical stability: PP has good chemical stability, can be concentrated sulfuric acid and concentrated nitric acid erosion, are relatively stable to various other chemical reagents, but low molecular weight aliphatic hydrocarbon and aromatic hydrocarbon can make PP softening and swelling, chemical stability with the increase of the crystallinity is improved. Therefore, PP is suitable for the production of pipeline and accessories in Russian chemical industry, and has good corrosion prevention effect.

(5) the electrical properties of polypropylene high insulating performance, because it does not absorb water, so the effect of insulation performance is not affected by humidity, have higher dielectric constant, and the temperature rise, heat can be used for the production of electrical insulation products, breakdown voltage is also very high, suitable for electrical accessories etc.. It has good resistance to voltage and arc resistance, but it has high static electricity, and it is easy to be aged with copper.

(6) weatherability: polypropylene is very sensitive to ultraviolet radiation. Adding Zinc Oxide thiopropionic acid, cinnamon fat and carbon black similar cream in February can improve its aging resistance.

Molding process

The selection of injection molding machine: there is no special requirement for the selection of injection molding machine. Because of the high crystallinity of PP, it is necessary to use a computer injection machine with high injection pressure and multi - section control. The clamping force according to the general 3800t/ meters to determine the injection amount is 20%-85%.