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Role of cooling tower packing
Release time:
2017-08-24
The filler increases the viscosity of the material, especially the fiber filler increases the viscosity significantly. The filler before addition should be dehydrated to avoid consuming part of the isocyanate. It must be noted that the generation of carbon dioxide will cause the resin to foam and affect the physical properties of the polyurethane resin. In order to speed up the wetting rate of the filler and reduce the viscosity of the system, or add more fillers to the polyurethane resin, it is sometimes necessary to add a wetting or wet dispersant to the resin in advance.
In-mold paint is an additive with three functions of coating, color paste and release agent. It is evenly sprayed in the mold, after the paint film is dried, you can mold polyurethane soles, self-skinning foam, polyurethane flexible foam. After the hard foam product is demoulded, the color paint is attached to the molded peripheral product.
The mechanism of action of the filler: filler as an additive, mainly through its occupied volume play a role, due to the presence of filler, the molecular chain of the matrix material can no longer occupy all the original space, so that the connected chain segments are fixed to some extent, and may cause the orientation of the matrix polymer. Due to the dimensional stability of the filler, in the filled polymer, the molecular chain movement in the polymer interface region is restricted, and the glass transition temperature is increased, the thermal deformation temperature is increased, the shrinkage rate is reduced, and the elastic modulus, hardness, stiffness, and impact strength are increased.
the role of filler:
① Reduce the shrinkage rate of molded parts, improve the dimensional stability, surface finish, smoothness and flatness or mattness of the products;
② effective regulator of resin viscosity;
③It can meet different performance requirements, improve wear resistance, improve electrical conductivity and thermal conductivity, etc. Most fillers can improve the impact strength and compressive strength of the material, but can not improve the tensile strength;
④ can improve the coloring effect of the pigment;
⑤ Some fillers have excellent light stability and chemical resistance;
⑥ has the function of increasing capacity, which can reduce costs and improve the competitiveness of products in the market.
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