Nylon elastomer types and dynamic vulcanization preparation process

2022/07/26

Nylon elastomer has rubber elasticity and thermoplastic reprocessing properties, and is called third-generation rubber. Its production technology is simple, and can be directly processed into products by extrusion, injection molding, molding, blow molding and other methods, and has high resource utilization rate, repeatable processing, economic development and environmental protection, so we are widely used in construction, wire and cable, Automobiles, medical service equipment, e-commerce products and other related education industries have a good economic and environmental benefits and social work benefits.

According to the preparation principle, nylon-based TPE can be divided into two categories: rubber-plastic blending and chemical synthesis. Among them, rubber and plastic elastomer blends are easy to process, have a wide range of performance adjustments, and low production costs, and have developed rapidly in recent years.

What is the dynamic curing technology of nylon elastomer?

 

 

Dynamic vulcanization refers to the non-vulcanized rubber and PP, PVC, PA and other thermoplastic polymer resins are blended in the melt at high temperature, and the rubber is vulcanized under the action of the cross-linking agent to obtain micron Grade rubber phase particles and uniformly dispersed in the resin. The rubber particles are uniformly dispersed in the basic structure of the plastic and are very stable with no biological changes during processing.

The process management of nylon elastomers prepared by dynamic vulcanization involves a series of complex environmental and social problems such as the interaction of mixture interfaces, dynamic vulcanization reaction and rubber shear dispersion. Therefore, the processing and production technology and mixing equipment of enterprises are the core information technology for preparing elastomers. .

Nylon elastomer treatment technology

The processing temperature is required to be 10-30°C higher than the melting temperature of the selected resin to ensure that the viscosity of the two-phase melt is similar and matches the decomposition temperature of the vulcanizing agent. Thus, a fine and uniform structure and excellent overall properties are obtained.

Reasonably and effectively control the working time of mixing. Agitation time affects the degree of crosslinking of Chinese rubber, dispersion of rubber particles, and degradation of the mixture.

During the stirring process, increasing the speed of the screw or rotor will enhance the shearing and stirring effect, promote the crushing of rubber, reduce the size of rubber particles, make the dispersion more uniform, and improve the tensile strength and elongation at break of the material. However, the high shear rate will increase the temperature of the material of the enterprise, which will lead to the rapid vulcanization of Chinese rubber, which is not conducive to the crushing and dispersion of the rubber phase, and the problem of rough microeconomic structure will occur. the

The mixing equipment used in dynamic vulcanization technology includes leveling machine, mixer, single-screw extruder, twin-screw extruder, etc. Among them, open and closed smelters are easy to control the curing time, and the curing process can be observed through the torque flow curve, but the production efficiency is not high. The extruder can realize the continuous production of a nylon elastomer industrial enterprise, which is easy to manage and control, but the material residence time is short, and the development of the vulcanization degree of the rubber phase is limited.

 

Key words:

Nylon elastomer,PEBAX,Shanghai nylon material

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