A kind of preparation method of in-situ graft modified rubber

Abstract

The invention provides a method for preparing in-situ graft modified rubber. In this method, the coupling agent is premixed and absorbed with the inert filler in advance, and the liquid coupling agent is converted into a solid form, which effectively ensures the coupling agent and the reinforcement The dispersion uniformity of the filler, and then by adjusting the process conditions to ensure that the high-temperature grafting reaction is carried out on the basis of the uniform dispersion of the reinforcing filler and the coupling agent, to ensure the efficiency, uniformity and stability of the reaction, and to ensure that the reaction is fully carried out. The method can be directly adopted in the production of mixed rubber, and at the same time can achieve the purpose of reducing production costs. The rubber products prepared by the method have excellent properties such as low heat generation, low pressure change, low creep, and aging resistance.

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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