High-rigidity, high-toughness and low-shrinkage-percentage bulk molding compound and preparation method thereof

Abstract

The invention relates to high-rigidity, high-toughness and low-shrinkage-percentage bulk molding compound and a preparation method thereof. The bulk molding compound is prepared from the following ingredients in weight percentage: 20% to 30% of unsaturated polyester resin, 8% to 12% of polyurethane elastomer resin, 1% to 5% of thermoplastic resin, 8% to 14% of antishrinking agent, 0.2%to 0.4% of tert-butyl peroxybenzoate, 0.2% to 0.4% of tert-butyl cyclohexane peroxide, 0.02%to 0.05% of p-benzoquinone solution, 0.02% to 0.05% of tert-butyl phthalate xylenol solution, 1% to 2% of releasing agent, 15% to 30% of aluminum hydroxide, 1% to 8% of calcium carbonate and 15% to 30% of alkali-free chopped glass fiber. According to the bulk molding compound, the polyurethane elastomer resin and the linear thermoplastic resin are introduced, the polyurethane elastomer resin can be mixed and cross-linked with the unsaturated polyester resin, the linear thermoplastic resin can form a cross network structure with the unsaturated resin, not only are rigidity and toughness of the bulk molding compound obviously improved, but also the shrinkage rate of the bulk molding compound is reduced.

Description

technical field [0001] The invention relates to a bulk molding compound and a preparation method thereof, in particular to a bulk molding compound with high rigidity, high toughness and low shrinkage rate and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of society, people pay more and more attention to composite materials with excellent performance. Among them, bulk molding plastics can replace wood and steel to a certain extent, and are widely used in industry, transportation, construction, electrical appliances, etc. All aspects occupy an extremely important position in production and life. The appearance of bulk molding compound is similar to bulk clay, which is composed of thermosetting unsaturated polyester resin, mixed with various fillers, fiber reinforcement materials, catalysts, stabilizers and pigments, etc. to form a composite material for compression molding or injection molding . ...

AI Technical Summary

Problems solved by technology

[0003] At present, the insulating materials used in the low-voltage electrical appliance industry generally use bulk molding compounds required by national standards, but due to the rapid development of the voltage electrical industry, ordinary bulk molding compounds cannot meet high-standard switchgear, and are used in low-voltage electrical switchgear The bulk molding compound on the raw material of the insulating part is required to have good processing performance, and it is easy to release the mold during manufacture, without cracking, good insulation effect, good flame retardancy, high bending strength, and impact strength. advanced features

Although the existing bulk molding compound can meet the conventional performance requirements, its products still need to be improved in terms of mechanical properties, especially the strength requirements such as high bending strength and high impact strength, which can not meet the insulation requirements of low-voltage electrical switchgear. Requirements for the use of raw materials

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