Preparation method of in-situ graft modification rubber

Abstract

The invention provides a preparation method of an in-situ graft modification rubber. According to the method, a coupling agent and inert filler are premixed in advance and absorbed, the liquid coupling agent is converted to be in a solid form, and the dispersion uniformity of the coupling agent and the reinforcing filler are effectively ensured; and then the process conditions are regulated and controlled for ensuring that a high-temperature grafting reaction is made on the basis of the dispersion uniformity of the reinforcing filler and the coupling agent, the efficiency, uniformity and stability of the reaction are ensured, and it is ensured that the reaction is sufficiently made. The method can be directly used in rubber compound production, and meanwhile, the aim of reducing the production cost can be achieved. A rubber product prepared by the method has the excellent performances of low heat generation, low pressure changes, low creep, aging resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of rubber composite materials, and in particular relates to a preparation method of in-situ graft modified rubber. Background technique [0002] In the rubber industry, the performance of rubber products is generally improved by adding reinforcing filler materials, but the particles of the reinforcing filler materials are easy to agglomerate, and it is difficult to disperse uniformly in the rubber matrix; it is usually modified with a coupling agent. At a certain temperature, a firm network structure is formed between the coupling agent and the rubber molecular chain, and the filler forms a gel component through the coupling agent and the rubber, which can improve the creep performance and dynamic performance of the rubber, and increase the resistance of the rubber. Aging performance, effectively reducing pressure change and fatigue heat generation. At present, the modification effect of liquid coupling age...

AI Technical Summary

Problems solved by technology

In the existing technology, the coupling agent and the reinforcing filling material are usually added to the internal mixer at the same time, but due to the small amount of the coupling agent, the addition ratio of the reinforcing filling material is far from that of the reinforcing filling material, and due to the density of the two Different, the volume ratio differs by more than a hundred times, only part of the filling material that wraps the coupling agent can fully contact with the coupling agent, and most of the filling materials are difficult to contact the coupling during the banburying process or even under a long time of stirring. Reinforcing filling materials and coupling agents are prone to uneven dispersion, resulting in uneven heating reaction, which not only causes the gel particles formed between the filling material and rubber to be of different sizes and unevenly distributed, and the product The weak point of stress concentration is very easy to appear, and the three-dimensional network structure formed in the product is not perfect, which eventually leads to uneven and unstable performance of rubber products

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