Tough and high modulus silicone resin composition and preparation method thereof

Abstract

The invention discloses a tough high-modulus silicon resin composition and a preparation method thereof. The composition comprises the following components in parts by weight: 100 parts of component A, 30-70 parts of component B, 80-150 parts of component C, 8-40 parts of component D and 0.5-10 parts of component E, wherein the component A is organopolysiloxane with polymerization degree not lower than 4,000; the component B is silicon dioxide filler with specific surface area not lower than 50m<2> / g; the component C is unsaturated metal carboxylate; the component D is a toughening agent composition; and the component E is an organic peroxide. Through the invention, a tough high-modulus silicon resin material can be obtained; and the tough high-modulus silicon resin material with compression modulus of 0.8-1.8GPa, good appearance and uniform and consistent interior can be obtained by a compression moulding method or an extrusion or injection moulding method.

Description

technical field [0001] The invention relates to a silicone resin composition with toughness and high modulus and a preparation method thereof. Background technique [0002] Silicone resin has excellent high temperature resistance, cold resistance and weather resistance, and its mechanical properties are relatively stable in the temperature range of -50 to 300 ° C. Due to its low glass transition temperature (-70 to -140 ° C), small specific gravity, and easy Formed into various shapes, it has good characteristics of absorbing mechanical energy, and is widely used as vibration isolation and shock absorbing materials for power machinery of ships, vehicles and aircrafts, instruments and meters, and electronic components. [0003] Ordinary silicone resin materials have small compression modulus (<10MPa) and poor ability to absorb mechanical energy, so it is difficult to meet the requirements of shock absorption and vibration isolation for precision instruments. In the resear...

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Problems solved by technology

[0003] Ordinary silicone resin materials have small compression modulus (<10MPa) and poor ability to absorb mechanical energy, so it is difficult to meet the requirements of cushioning, shock absorption and vibration isolation for precision instruments and meters

In the research on the blending enhancement of silicone resin / unsaturated metal carboxylate salt, it was found that the silicone resin material was reinforced with a large amount (80-150 parts) of unsaturated metal carboxylate salt, although the compressive modulus of the material was greatly improved. Less than 10MPa rises to 0.5GPa or even above 1GPa, but under the condition of compression modulus greater than 0.8GPa, the high modulus silicone resin is brittle during compression or impact, and cracks immediately after exceeding its compressive strength instead of plastic deformation , its fracture strain is less than 5%, and it is easy to break under the impact of falling hammer, so this material is difficult to meet the requirements of practical use

Judging from the data in the above literature, the dosage range of unsaturated carboxylate is relatively small, and it is difficult to meet the requirement of high compressive modulus (>200MPa)

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