ABS plastic heat is not good, how to solve it?

ABS has good processability and good toughness, but its heat resistance is not enough, which limits its application range. In general, the ABS Vicat softening point is around 95 ° C, and the heat-resistant ABS (VST/B/50) exceeds 100 ° C. Therefore, it is necessary to increase the heat resistance of ABS to expand its application. Especially in the automotive and electronic and electrical aspects, for automotive interior parts dashboards, toolboxes, ashtrays, new extrusion and other components; automotive exterior components, such as front grille, car base, painted mirror door panel components, wheels The hood, the spoiler, the gearbox cover, etc. all require good heat resistance. In addition, in the electrical and electronic aspects, vacuum cleaner housings, microwave oven door frames, hair dryers, etc. also require ABS materials to have better heat resistance, in order to meet the material requirements of the parts, the specific requirements are as follows:

High stability in high temperature environments;

High impact resistance;

Excellent dimensional stability;

Easy to process;

Unbeatable surface;

Low VOC.

Second, how to improve the heat resistance of ABS plastics?

The heat resistance of plastics is generally defined as the measure of how many characteristics are maintained below ambient temperature in high temperature environments. In general, high-molecular materials change the physical properties of materials because of the increased molecular motion, and the most obvious is elasticity. The most common way to improve the heat resistance of polymer materials is to inhibit molecular motion. Generally there are the following methods:

1. The molecular model of the polymer is framed into a three-dimensional structure to form a mesh, thereby suppressing molecular motion;

2. Add a difficult-to-operate aromatic ring and alicyclic structure to the molecular mechanism;

3. Add a polar group to the polymer to rely on the binding force of the hydroxide chain to inhibit the molecular structure;

4. Introduce a crystal structure into the polymer structure for heat-resistant modification, using a heat-resistant modifier.

In general, ABS heat resistance can be improved by lowering the rubber content, increasing the SAN molecular weight and the acrylonitrile content, but the method of developing heat resistance and ABS by adding a heat resistant monomer or a heat resistant additive has been attracting more and more attention. Therefore, many well-known ABS plastics modification companies use heat-resistant modifiers to improve the heat resistance of ABS.

Three good heat-resistant modifiers should meet these 8 requirements!

At present, in addition to improving the heat resistance of ABS plastics, the problem of automotive VOCs has become more and more important; people hope that the lower the volatile organic solvents in heat-resistant ABS plastics, the better. Therefore, the requirements for heat-resistant modifying auxiliaries have not only stayed in the demand for improving heat resistance, but also have requirements for reducing VOC. Therefore, in the future, the heat-resistant modification additives required by the modified plastics enterprises need to meet the following requirements:

Higher heat resistance (glass transition temperature = 175 ° C);

Better thermal stability;

Better dimensional stability;

Very easy to mix with ABS and SAN;

Improve the surface adhesion of the product;

Low VOC;

High liquidity;

Good processing performance.