Nylon elastomer types and dynamic vulcanization preparation process

2022/06/23

Thermoplastic nylon elastomers combine rubber elasticity with thermoplastic repeatability. The production process is simple, and the products can be directly processed by extrusion, injection molding, molding, blow molding, etc., with high resource utilization, repeatable processing, economical and environmental protection, so it is widely used in construction, wires and cables, automobiles, medical equipment, electronic products, etc. Related industries, with good economic and social effects. ​​

Nylon elastomers are easier to process, have a wide range of performance adjustments, and have low production costs. They have developed faster in recent years.

What is dynamic vulcanization manufacturing technology?

Dynamic vulcanization is rubber and thermoplastic polymers that cannot be vulcanized.

The process of preparing nylon elastomers by dynamic vulcanization involves a series of complex problems such as mixture interface interaction, dynamic vulcanization reaction, and rubber shear dispersion. Therefore, processing technology and mixing equipment are the key technologies for preparing elastomers.

 

 

Processing technology of nylon elastomer

The processing temperature of nylon elastomer is required to be 10 ~ 30 higher than the melt temperature of the selected resin. The two-phase melt viscosity is close, and it must be consistent with the decomposition temperature of the vulcanizing agent in order to obtain a fine and uniform microstructure and excellent comprehensive performance.

Reasonable control of mixing time. Mixing time affects the degree of rubber intersection, dispersion of rubber particles, and decomposition of the mixture.

In the mixing process, increasing the speed of the screw or rotor helps to strengthen the shearing and mixing effect, promote the damage of the rubber phase, reduce the size of the rubber particles, disperse evenly, and improve the tensile strength and elongation at break of the material. However, a high shear rate will cause the temperature of the material to rise, and the rubber vulcanization speed will be too fast, which is not conducive to the crushing and dispersion of the rubber phase, resulting in the problem of rough microstructure.

mixing equipment

The mixing equipment used in dynamic vulcanization technology includes open-line, internal mixer, single-screw extruder, twin-screw extruder, etc. Among them, the smelting machine and the internal mixer can easily control the vulcanization time, and observe the vulcanization process through the torque flow curve, but the productivity is not high. The extruder realizes the industrialized continuous production of elastomer, which is easy to control, but the material residence time is short and the degree of vulcanization of the rubber phase is limited.

What are the types of nylon elastomers?

Nylon elastomers prepared by dynamic vulcanization include EPDM, nitrile, butyl, and acrylic rubber.

The tensile strength, tear strength and elongation at break of nylon elastomers generally increase with the degree of interconnection of the rubber.

In addition to mechanical properties, the oil resistance and high temperature resistance of nylon elastomers are also related to the degree of vulcanization.

 

Key words:

nylon elastomer

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