Copolymerized high-performance damping silicon rubber and preparation method thereof

Abstract

The invention discloses copolymerized high-performance damping silicon rubber and a preparation method thereof. The preparation method is characterized by comprising the following steps of: adding 100 parts by mole of octamethylcy-clotetrasiloxane, 0.001-1 part by mole of tetram-ethy1tetravinylcyclotetrasiloxane, 1-50 parts by mole of octaphenyl cyclotetrasiloxane and 1-500 parts by mole of hybrid ring containing methylphenyl siloxane chain links into a reactor; dehydrating by forming nitrogen bubbles at the temperature of between 55 DEG C and 65 DEG C under the protection of nitrogen gas for 1-3 hours; adding 0.01-5 percent by weight of catalyst; continually drying nitrogen bubbles; adding 0.00001-1 part by millimole of end-capping reagent when the viscosity rises; undergoing a balanced reaction at the temperature of between 90 DEG C and 110 DEG C for 7-8 hours; raising the temperature to 145-165 DEG C after the reaction; preserving heat for 1-2 hours; decomposing and breaking the catalyst; raising the temperature to 180-200 DEG C finally; separating low molecular substances out at reduced pressure under the vacuum degree of 6-12 Mpa until distillate is eliminated fully; cooling to room temperature and discharging; and stopping reducing pressure to obtain polymethyl phenyl ethylene siloxane. Phenyl siloxane rubber further prepared from the copolymer has superior damping capacity and mechanical property.

Description

technical field [0001] The invention relates to a copolymerized high-performance damping silicone rubber and a preparation method thereof, belonging to the field of functional polymer materials. Background technique [0002] Silicone rubber is a special rubber material with certain mechanical properties in a wide temperature range or wide frequency, superior heat resistance, cold resistance, weather resistance, ozone resistance, and radiation resistance. It is widely used in aerospace, precision instruments, and mechanical equipment. and national security and other cutting-edge technology fields. Compared with other materials such as polyurethane, polyacrylate rubber and butyl rubber, the molecular chain structure of ordinary methyl vinyl silicone rubber is symmetrical, and although there are many side methyl groups, it is small in size and small in steric hindrance, resulting in its damping loss factor tanδ is very small (0.05-0.1), in order to improve the damping performa...

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Problems solved by technology

However, the structure of this copolymer is very different from that of silicone rubber, which makes the excellent high and low temperature resistance of silicone rubber worse, and increases the modulus of the rubber material in the operating temperature range, which is not conducive to the wide temperature range. Stable damping performance is obtained in the range of

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