Butyl rubber/poly(meth)acrylate interpenetrating polymer networks damping material and process for preparing same

Abstract

The interpenetrating butyl rubber / poly (methyl) acrylate polymer network damping material and its preparation process features that butyl rubber in 100 (in weight portions, the same below), sulfurizing agent 1-15, sulfurizing assistant 1.5-6.0 and stuffing 10-20 are first mixed homogeneously in a double-roller mixing machine, and pressed in a press at 140-170 deg.c and 5-10 MPa for 10-20 min to obtain the first sulfurized butyl rubber network; the sulfurized butyl rubber is then soaked in the mixture comprising acrylate or methacrylate monomer 100, crosslinking agent 1-10 and initiator 0.2-0.8 to reach a 30-40 % weight increase; and the above said mixture is finally in-situ reacted at 60-90 deg.c and 5-10 MPa and mold pressed for 4-8 hr to form the interpenetrating butyl rubber / poly (methyl) acrylate polymer network damping material with butyl rubber in 60-90 wt% and poly (methyl) acrylate polymer in 10-40 wt%.

Description

1. Technical field [0001] The invention relates to a butyl rubber / poly(meth)acrylate composite damping material and a preparation method thereof, belonging to the field of polymer synthesis and molding processing. 2. Background technology [0002] Butyl rubber is a traditional damping material because every other carbon atom in the isobutylene molecular chain has two symmetrically substituted methyl groups, the number of substituents is large, the chain segment relaxation resistance is large, and the internal friction peak is high. However, the maximum damping value of butyl rubber appears at -30 to -40°C. At 0°C, the damping value is low. Above 10°C, the damping function is almost lost, which greatly reduces the effective damping function of butyl rubber near room temperature. . In order to broaden the effective damping functional area of ​​butyl rubber near room temperature, many experts and scholars at home and abroad have improved the performance of butyl rubber through...

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Problems solved by technology

The research on the blending of butyl rubber and neoprene reported by Professor Luo Quankun (≤Synthetic Rubber Industry≥Journal 2004.NO.1) showed that the compatibility of butyl rubber and neoprene in the blend is good , an internal friction peak appears at 0°C, but it is difficult to calculate its maximum damping value (tanδ max ) and move to a higher temperature region

[0004] 2. Kioura, Renzo, etc. reported the research work on the compatibilization and blending of butyl rubber / polyamide with the block copolymer of the two as compatibilizer (J.Appl.Polym.Sci., 1999, 74, 3548) , the results show that the compatibilizer can significantly improve the compatibility of the two, which is manifested in the decrease of the phase domain of the compatibilized blend and the physical and mechanical properties are greatly improved. However, because the polyamide damping value itself is not high, As a result, the damping value in the high temperature area is still low, tanδ max ≤0.15

Taiwan scholar Liao Fusheng reported in Polymer, 1994,35 (12), in the chlorinated butyl rubber / polypropylene blend, due to the effect of thermal stress, the liquid-liquid transformation of polypropylene to butyl rubber (T 11 ) has an inhibitory effect, and its maximum damping value tanδ max <0.35, it is difficult to meet the application requirements of shock absorption and noise reduction

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