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Zhejiang Jiayue Machinery Manufacturing Co.,Ltd
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Contact Person: Jade Le

Screw for ABS plastics

- Sep 10, 2018 -

ABS resin is one of the five major synthetic resins. It is excellent in impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties. It is also easy to process, stable in product size and good in surface gloss. It is easy to apply. Coloring, it can also be used for secondary processing such as surface metallization, electroplating, welding, hot pressing and bonding. It is widely used in industrial fields such as machinery, automotive, electronic appliances, instrumentation, textile and construction. Wide range of thermoplastic engineering plastics.


    The machine used for the production of ABS plastic is a sheet extruder, and the screw matched with ABS is the following parameter requirement.

Length to diameter ratio: 15-46.

Diameter value: 15mm-300mm.

Straightness value: 0.015um

Quenching and tempering hardness value: HB260-290

Nitriding hardness value: 950-1020HV

Nitrided brittleness value: first grade (advanced)

Surface roughness value: Ra0.4um

Nitrided layer depth value: 0.5-0.8mm

Hardness value requirements: HRC60 or above

Manufacturing process: SACM645, 38CrMoALA, SKD61, SKD11, tungsten carbide alloy and other manufacturing processes.

ABS plastics for sheet extruders can be roughly divided into three categories: weather resistant ABS, heat resistant ABS, transparent ABS.

   (1) Weather resistant ABS

Since the butadiene rubber component in the ABS resin has a double bond remaining, it is easily aged under the action of light and oxygen. To overcome this disadvantage, a chlorinated polyethylene (CPE) containing no double bond is used instead of the butadiene. An ACS resin was obtained from rubber. ACS resin is a graft of acrylonitrile and styrene onto the CPE "main chain, which overcomes the shortcomings of ABS resin weather resistance and charged pollution, and has a total flame retardancy, and the processing overflow is reduced to 190-210 ° C. ACS It can be used as a co-extruded cover for weather-resistant outdoor material window frames and door frames. There is also a commonly used ABS material.


    (2) Heat resistant ABS

The modification method of copolymerization reaction of ABS and N-phenylmaleimide (N-PM1) improves the thermal decomposition temperature, glass transition temperature, and chemical resistance when M! which improves the heat resistance of ABS Performance, UV resistance and processability. Under the premise of not reducing the performance of ABS, when N-PMI is added with 5%-10%, the heat distortion temperature is 125-130 ° C, and even 150 ° C, which becomes super heat-resistant ABS.


   (3) Transparent ABS

ABS is an opaque resin. Its opacity is due to the difference in refractive index between the rubber component and the tree component of the resin. Photorefraction and light scattering occur at the interface. In order to make the product transparent, it is necessary to make The refractive index is similar to that of the resin component and the resin component, and introduction of methyl methacrylate (MMA) can lower the refractive index of the resin phase, thereby achieving the above object. ABS and MMA copolymerization modification method can also be used to prepare ABS transparent resin, which has comprehensive properties of strength, toughness, transparency and processability, and is an economic substitute for polycarbonate (PC) with transparency of 88%. The haze is 5%.

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