The effect of talc powder on plastics

The addition of micronized talc powder can change the addition of talc to plastic products, which can change plastics such as molding shrinkage, plastic hardness, flexural modulus, tensile strength, impact strength, thermal deformation temperature, product molding process, dimensional stability, etc. Multiple influences. The specific impact of each performance is as follows:


1. Adding talc powder to plastic can effectively improve the molding shrinkage rate of plastic products, thereby improving the surface properties of the product. Talc powder itself has no shrinkage, thereby reducing the molding shrinkage rate of the overall material; fine talcum powder can also be used as PP The nucleating agent plays a role in changing the structure of PP, prevents the formation of PP large spherulites, and also reduces the crystallinity of PP.
2. Surface hardness and surface scratch resistance are also requirements for the use of certain plastic products. Adding talc powder to polyethylene and polypropylene plastics can effectively improve the surface hardness and surface scratch resistance of products.
3. The flexural modulus, that is, the rigidity of the product we often say, is a very important indicator when plastic products are used, especially for engineering plastic products. The white flake structure of talcum powder added to any kind of plastic can significantly increase its flexural modulus, and it can be doubled. For general mineral filling, this is the most significant feature of talc. At this point, calcium carbonate is not as good as talc.
4. The improvement of the tensile strength of plastic materials by talc powder is relatively limited. The content of talc powder can increase the tensile strength within a certain range. If the content of talc powder continues to increase, the tensile strength will decrease instead. For some plastics, the addition of talc will not only increase the tensile strength, but will decrease it.
5. The impact of talc on the impact strength of plastic materials is similar to the impact of talc on the tensile strength of plastic materials. It is also found in the experiment that the fineness of various mineral additives has a great influence on the impact toughness. The greater the fineness when the content remains unchanged, the better the toughness of the material.
6. Talc has obvious influence on the thermal deformation temperature of plastic materials, which can effectively increase the thermal deformation temperature of various plastics, thereby increasing the heat resistance of plastics.
7. The influence of talc powder on the molding process of plastic materials is mainly that talc powder can effectively improve the fluidity and molding shrinkage of plastic materials, thereby improving the stability of product molding and improving product quality, especially for some melts with low strength For plastics, adding talc powder can effectively improve the melt strength, which is very effective in extrusion molding, such as polypropylene and nylon in extrusion molding.