Resin-based composite material with controllable linear expansion coefficient and preparation method thereof

Abstract

The invention provides a resin-based composite material with a controllable linear expansion coefficient and a preparation method thereof. The composite material is characterized by mainly comprising the following components in parts by weight: 10 parts of unsaturated polyester resin, 2-30 parts of filling material, 2-20 parts of fiber, 1-5 parts of low shrinking agent, 0.6-2 parts of mould release agent and 0.2-1 parts of initiator, wherein the filling material and fiber are materials with negative expansion coefficients or low expansion coefficients. The preparation method comprises the following steps: evenly mixing 1-5 parts of low shrinking agent, 0.6-2 parts of mould release agent and 0.2-1.5 parts of initiator with 10 parts of unsaturated polyester resin; then adding 2-30 parts of filling material and 2-20 parts of fiber for evenly mixing again; and finally, carrying out compression molding at the temperature of 140-160 DEG C. The linear expansion coefficient of the material provided by the invention is adjustable within a range of (8-30)*10<-6>/ DEG C, and the material provided by the invention has isotropy.

Description

technical field [0001] The invention relates to a resin-based composite material with a controllable linear expansion coefficient and a preparation method thereof, in particular to a resin-based composite material with a low linear expansion coefficient and a controllable linear expansion coefficient and a preparation method thereof, which belongs to the resin-based composite material and its manufacturing methods. Background technique [0002] At present, in the fields of electronics, communications and aerospace, in order to ensure that the product can work stably in an environment with large temperature changes or can be used reliably in different regions with large temperature differences, materials with low expansion coefficients are usually used to make the products excellent. dimensional stability. [0003] In the field of communication, the widely used low-expansion materials are metal alloys, such as Invar alloys (the coefficient of linear expansion is 0.8×10 -6 / ...

AI Technical Summary

Problems solved by technology

However, metal materials also have many insurmountable defects: first, the processing of metal skeleton parts is difficult, the processing cost is high, and material waste is large; second, the density of metal materials is high, and the resulting products have a large load on the supporting structure; third, the price of metal materials is high , which increases the cost of the product; Fourth, the linear expansion coefficient of the metal material is relatively fixed, and it is difficult to adjust according to the demand, so it is difficult to achieve the best match with other components (here, the linear expansion coefficient of the components made of different materials is the same)

The composite material uses fibers and fillers at the same time, which greatly reduces the linear expansion coefficient of the resin, but the linear expansion coefficient of the composite material is anisotropic, and the linear expansion coefficient of the laminated board prepared with it will be much larger in the direction perpendicular to the board than along the direction Coefficient of linear expansion in plane direction

In addition, benzoxazine resin is brittle and poor in manufacturability, especially when fillers are added, these two problems become more prominent

[0017] Based on the above, there are still many problems in the existing resin-based composite materials, including high cost, poor dimensional stability, poor mechanical properties and anisotropy of linear expansion coefficient, etc.