A kind of lignin grafted brominated butyl rubber composite material and preparation method thereof

Abstract

The invention discloses a lignin-grafted brominated butyl rubber composite material and a preparation method thereof. The composite material provided by the invention comprises the following reactionraw materials in parts by mass: 100 parts of brominated butyl rubber, 1 to 40 parts of lignin, 5 to 80 parts of white carbon black, 0 to 5 parts of a silane coupling agent, 1 to 15 parts of a coordination auxiliary agent, 0.1 to 1 part of elemental sulfur, and 0.1 to 8 parts of a vulcanization auxiliary agent. According to the method, through a grafting reaction of a hydroxyl group of the lignin and bromine atoms in the brominated butyl rubber, the polarity of the rubber chain is increased, the dispersion of the white carbon black is promoted, and the use amount of the silane coupling agent isreduced; the coordination auxiliary agent is introduced into the composite material, the coordination auxiliary agent and the grafted lignin can be subjected to physical crosslinking, and polar functional groups such as a hydroxyl group of the white carbon black and a coordination vulcanizing agent can be subjected to coordination crosslinking, so that the mechanical properties of the composite material can be further enhanced; and in addition, the method can not only significantly reduce production costs, but also reduce VOC emission.

Description

technical field [0001] The invention belongs to the technical field of rubber composite materials, and in particular relates to a lignin grafted brominated butyl rubber composite material and a preparation method thereof. Background technique [0002] Brominated butyl rubber (BIIR), as one of the modified products of butyl rubber (IIR), retains 90% of the double bonds of the original butyl rubber, and introduces a highly active reactive functional group: allyl bromide, so brominated Butyl rubber not only maintains the excellent air tightness, heat aging resistance, and damping properties of butyl rubber, but also has excellent properties such as fast vulcanization speed and suitable for various vulcanization systems. Therefore, BIIR is widely used in the fields of radial tires, heat-resistant inner tubes, medicine bottle stoppers and machine liners. However, the mechanical properties of bromobutyl rubber are insufficient when used alone, and a large number of fillers need t...

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Problems solved by technology

[0005] However, the presence of polar oxygen-containing functional groups makes lignin easily agglomerated and difficult to disperse in the rubber matrix, which seriously deteriorates the reinforcing performance.

Although there have been a large number of research reports on the preparation of composite materials by blending lignin and rubber at home and abroad, most of the prepared composite materials have poor performance, and the modification process of lignin is cumbersome, which is not conducive to industrial production and application.

For example, Bahl used lignin sulfate to fill styrene-butadiene rubber, and found that polar lignin particles agglomerated seriously in the rubber matrix, which not only reduced the cross-linking density of rubber, but also made the reinforcing effect of lignin on non-polar styrene-butadiene rubber not obvious , will also prolong the vulcanization time of rubber [Journal of Applied Polymer Science.,2014,131(7):1.]; Professor He Hui of South China University of Technology used latex co-precipitation method to prepare lignin / silica / natural rubber composite material , when lignin partially replaces silica, although the dispersion of filler particles is improved, the mechanical properties are lower than those of pure silica reinforced rubber [Polymer Testing.,2016,54:176.]

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