What is the function of filling agent for blow molding?What are the requirements?
Adding fillers to plastics can reduce the cost of the product on the one hand and improve some properties of plastics on the other.For example, it can improve the hardness and rigidity of products, reduce the shrinkage of products, and increase the quality of products at the same time. However, the addition of fillers will also bring some difficulties to the molding process, such as greater wear on equipment, decreased gloss of products, less bright colors, etc., which also limits their dosage.
The main types of filler are: calcium carbonate, active calcium carbonate, clay, glass fiber, mica powder.
The requirements for fillers are as follows.
(1) appropriate fineness and good dispersion.
(2) strong ability to absorb plasticizers.
(3) the polymer and other auxiliaries are inert and do not undergo chemical reactions.
(4) no serious damage to the processing performance.
(5) good thermal stability and light stability.
(6) low price.
(7) except dark containers, the shallower the color, the better.