PET fiber hybrid glass fiber reinforced unsaturated polyester resin bulk molding compound and preparation method thereof

Abstract

The invention discloses a PET fiber hybrid glass fiber reinforced unsaturated polyester resin bulk molding compound which comprises the following components in parts by weight: 80-150 parts of BMC unsaturated polyester resin, 60-80 parts of a low shrinkage agent, 0.5-5 parts of a polymerization inhibitor, 0.5-10 parts of a curing agent, 8-15 parts of a release agent, 260-350 parts of calcium carbonate, 100-450 parts of aluminum hydroxide, 60-90 parts of chopped glass fibers and 5-30 parts of chopped PET fibers. The tensile strength and the impact property of the BMC prepared by mixing the PETfibers with the glass fibers are equivalent to those of the BMC prepared from pure glass fibers, the bending strength is improved, the glossiness of the product is well kept, and the problems that a plastic package BMC product is low in bending strength, high in brittleness and prone to cracking are solved.

Description

technical field [0001] The invention belongs to the field of chemical composite materials, and in particular relates to a PET fiber mixed glass fiber reinforced unsaturated polyester resin bulk molding compound and a preparation method thereof. Background technique [0002] Bulk molding compound—Bulk (Dough) molding comounds referred to as BMC (also known as DMC), mainly composed of unsaturated polyester resin (UP), anti-shrinkage agent (LPA), chopped glass fiber (GF), mineral filler and curing agent The fiber-reinforced unsaturated resin-based prepreg obtained by fully mixing and uniformly adding other additives through a kneader. BMC (DMC) materials were first used in production in Germany in the 1960s, and then popularized and applied in the United States and Japan in the 1970s and 1980s. Due to the limitations of large shrinkage of the reinforced matrix unsaturated resin (UP) after curing, the early bulk molding compounds lead to poor stability of the product, which gre...

AI Technical Summary

Problems solved by technology

Due to the low glass fiber content and low strength of BMC, the BMC rapid prototyping process is easy to crack and has poor impact strength. It is only suitable for the manufacture of products with generally small sizes and general strength requirements. Not enough to cause cracking problem

At present, the main solution to the insufficient impact strength of BMC and the easy cracking of products is to increase the glass fiber content of BMC aggregates, increase PE powder auxiliary materials, etc.

However, the disadvantage of adopting the technical solution of increasing the glass fiber content is that due to the brittleness of the glass fiber, it is easy to break and damage the strength loss during the mixing and molding process of the mass, and the excessively high glass fiber content will lead to a decrease in the wettability of the filler. The fluidity of BMC group material decreases, which may easily cause problems such as lack of material in sand holes and poor appearance of BMC products.

The main problem with the technical solution of adding PE powder is that the addition of PE powder will lead to a significant increase in BMC cost and lower cost performance

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