Neoprene rubber is made of chloroprene as the main raw material and is polymerized by α. It has good physical and mechanical properties, heat resistance, oil resistance, acid and alkali resistance, sunlight resistance, etc. It can be used to produce rubber conveyor belts, transmission belts, wires and cables, hoses, rubber boards, sealing products, etc. Adding an appropriate amount of rubber powder in the production of neoprene rubber products can not only further improve the tear resistance, wear resistance and fatigue temperature rise performance of rubber products, but also save raw rubber, solve the problem of disposal of some waste rubber products, and reduce more cost.
1. Classification and characteristics of rubber powder commonly used in neoprene products
(1) Vulcanized rubber powder: After purification and drying, waste rubber products are processed into powder with a certain fineness by mechanical, freezing and crushing methods; the production process is simple. In actual production, 60-100 mesh vulcanized rubber powder is more widely used in neoprene rubber products.
(2) Activated rubber powder: Vulcanized rubber powder is prepared by surface activation treatment and has reactivity. The preparation method of activated rubber powder used in chloroprene rubber products is as follows: add the vulcanized rubber powder into the mixer, and in the process of continuous stirring, add polymer activators with special functional groups in the molecule, catalysts and an appropriate amount of silane coupling agent , after 2-3min, add modifier and modified catalyst and stir for 2min. Compared with vulcanized rubber powder, the mixing effect of activated rubber powder in rubber is better.
2. Application skills of vulcanized rubber powder in neoprene products
(1) The influence of the fineness of the vulcanized rubber powder on the physical properties of the chloroprene rubber products: the smaller the particle size of the vulcanized rubber powder, the larger the specific surface area, and the oxygen-containing groups on the surface increase accordingly, which in turn increases the amount of rubber powder 2ELYY418 and rubber. The ability of molecular chains to diffuse and penetrate each other increases the uniformity of the dispersion of the rubber compound in the matrigel, the density of the vulcanizate increases, the tensile strength increases, and the heat-resistant air aging and oil resistance are also improved. The 300% tensile strength of the neoprene vulcanizate added with rubber powder is basically unchanged.
(2) Influence of vulcanized rubber powder varieties on the physical properties of chloroprene rubber products: According to the principle of chemical structure similarity, vulcanized rubber powder with the same rubber matrix can improve the rubber properties less than different types of vulcanized rubber powder. Under the conditions of the same particle size and dosage of rubber powder, as well as the same mixing process and vulcanization conditions, the tensile strength of the rubber with the same rubber powder is 1-3MP higher than that of the rubber with different rubber powders. And oil resistance is relatively better.
(3) The ideal dosage of vulcanized rubber powder in chloroprene rubber products: It is recommended to use vulcanized rubber powder of about 80 mesh in the production of chloroprene rubber products, and the dosage should be controlled at about 40 parts; -100 mesh product, the dosage can be increased to 60 parts, and the extrusion performance of neoprene vulcanizate is good.
3. Application skills of activated rubber powder in neoprene products
After adding activated rubber powder to neoprene rubber products, the comprehensive performance of vulcanized rubber is better, and the 300% tensile stress, hardness, tear strength, resilience, heat generation, wear amount, and heat aging resistance are improved to varying degrees. ; Activated rubber powder of the same variety and particle size is more used in neoprene than vulcanized rubber powder. In actual production, many chloroprene rubber product manufacturers will strengthen the physical and chemical combination among the vulcanized rubber powder and the matrix glue through physical, chemical, mechanical and other methods, and the editor will continue to discuss related issues with you later.
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