Novel long glass fiber-reinforced polyurethane technique capable of being produced into A-class surface product

Abstract

The invention relates to a long glass fiber-reinforced polyurethane product and a production technique, and the finished product of the long glass fiber-reinforced polyurethane is mainly used as a substitute for certain metal parts in the automobile manufacturing industry, particularly an automobile A-class surface product. The long glass fiber-reinforced polyurethane contains glass fibers and polyurethane combination which account for 10 percent to 40 percent of the total weight of a finished product, and the polyurethane combination contains a certain amount of isocyanate and polyether glycol or isocyanate and polyester polyol. The production technique includes steps such as mould preparation, release layer spraying, paint spraying, isolating layer material spraying, glass fiber-reinforced polyurethane pouring, mould-closed pressure-maintained solidification and demoulding. By means of methods such as 'in-mould paint spraying technique' and 'isolating layer material spraying', the invention solves the technical problem that the long glass fiber-reinforced polyurethane material can be hardly produced into the A-class surface product. Moreover, since the product can be produced in one step, the process is shortened compared with metal part machining, the production difficulty is decreased, and the product has the advantages of high strength, light weight, good sound-insulating and heat-insulating effects and the like.

Description

technical field [0001] The invention relates to a long glass fiber-reinforced polyurethane product, in particular to a process method for making a long glass fiber-reinforced polyurethane to produce an automobile grade A surface product. Background technique [0002] At present, long glass fiber reinforced polyurethane products in the domestic automobile manufacturing industry are mainly used in various automotive interior parts, such as door interior panels, instrument panels, and instrument frames. The process is mainly to use various foaming machines or manually cut the glass fiber mat or glass fiber yarn into a certain length, and then mix the components into isocyanate (ISO) and polyether polyol or isocyanate and polyester polyol ( POLY) blended raw materials and poured into the injection mold, the mold can be made of steel, aluminum, resin or alloy materials. The inner surface of the mold can choose to use plastic sheet or fiber fabric as the surface layer. At presen...

AI Technical Summary

Problems solved by technology

[0004] 1. The glass fiber reinforced polyurethane material is mixed with a certain length of glass fiber. After the product is formed, there are traces of glass fiber protrusions on the surface, resulting in uneven surface of the product;

[0005] 2. During the polymerization process of polyurethane materials, it is easy to cause many tiny pores on the surface, which are not easy to fill or difficult to fill;

[0006] 3. The release agent sprayed on the surface of the mold in order to facilitate demoulding will remain on the surface of the mold after the product is demoulded, which is not easy to remove, thus affecting the adhesion of the paint

Images