Sheet molding compound and preparation method thereof

Abstract

The invention relates to the field of high polymer materials, and particularly discloses a sheet molding compound and a preparation method thereof. The sheet molding compound is prepared from the following raw materials in parts by weight: 80 to 100 parts of polyurethane resin, 85 to 100 parts of basalt fiber, 25 to 40 parts of hollow glass beads, 30 to 45 parts of expanded microspheres, 4 to 6.5 parts of a thickening agent, 2.5 to 8 parts of a release agent, 10 to 16 parts of a low-shrinkage additive and 0.5 to 2.2 parts of a curing agent, the preparation method comprises the following steps: S1, weighing the polyurethane resin, the hollow glass beads and the expanded microspheres, mixing and stirring to prepare a primary mixture; s2, weighing a thickening agent, a release agent, a low-shrinkage additive and a curing agent, adding into the primary mixture, and uniformly mixing and stirring to obtain a mixture; and S3, mixing the mixture with basalt fibers, and carrying out compression molding and standing shaping to obtain a finished product. Therefore, the sheet molding compound has the advantages of good mechanical property, good insulating property and good plasticity at the same time.

Description

technical field [0001] This application relates to the field of polymer materials, more specifically, it relates to a sheet molding compound and its preparation method. Background technique [0002] Sheet molding compound (SMC) is abbreviated as SMC. It is made of SMC special yarn, unsaturated resin, low shrinkage additives, fillers and various additives by heating and pressing. It is widely used in construction, anti-corrosion and aerospace fields, meeting the requirements of high strength, light weight, high performance, insulation, and low dielectric loss in aerospace and military applications. [0003] The existing polyester composite materials premixed with SMC and BMC cannot meet the requirements of mechanical properties and insulation properties; while the composite materials made of epoxy system plus carbon fiber have good mechanical properties and insulation properties, However, the finished product has the problems of poor formability and poor surface plasticity, ...

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Problems solved by technology

[0003] The existing polyester composite materials premixed with SMC and BMC cannot meet the requirements of mechanical properties and insulation properties; while the composite materials made of epoxy system plus carbon fiber have good mechanical properties and insulation properties, However, the finished product has the problems of poor formability and poor surface plasticity, and the cost of carbon fiber is relatively high, which is easily not proportional to the value of the finished product

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