Low-temperature vulcanized masterbatch and preparation method thereof

Abstract

The invention relates to low-temperature vulcanized masterbatch, which consists of a main material and auxiliary materials, wherein the main material is high-temperature rubber; the auxiliary materials are mixed rubber A and mixed rubber B; and the formula comprises the components in parts by weight: 15-30 parts of high-temperature rubber, 1 part of mixed rubber and 1 part of mixed rubber B. A preparation method of the low-temperature vulcanized masterbatch comprises the following steps of: adding the high-temperature rubber into a rubber mixing mill to cover rolls; adding the mixed rubber A; after fully immersing the rolls, adjusting the roll distance to be less than 1 mm and grinding and bagging for at least twice; and adding the mixed rubber B, continuously performing the step 1 and producing a sheet. The low-temperature vulcanized masterbatch has the beneficial effects that the color and the physical performance of the high-temperature rubber are not changed, the vulcanization temperature of the original high-temperature vulcanized rubber is reduced, the requirement on the low-temperature rubber in a rubber product production process is met, meanwhile, aging damage of the original product vulcanized rubber due to secondary high temperature is avoided during repair of a rubber product, the vulcanization efficiency is high, energy is saved, and the repair is firm.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a low-temperature vulcanized masterbatch and a preparation method thereof. Background technique [0002] The rubber macromolecules chemically react with the cross-linking agent sulfur under heating, and the process of cross-linking into a three-dimensional network structure is called vulcanization. The vulcanized rubber is called vulcanized rubber. Vulcanization is the last process in rubber processing, and it can get shaped rubber products with practical value. Due to the poor thermal conductivity of rubber, if the product is very thick, it will take a long time for the heat to conduct to the center of the product. The use of high temperature vulcanization can shorten the operation time to a certain extent, but it often leads to scorch on the edge of the product near the hot plate. The general vulcanization temperature is 160-180°C, which consumes a lot of energy. [0003] If ...

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Problems solved by technology

Although this method is fast and simple to repair, it has the following disadvantages: ①The cost of the patch is high, which is more than 5-10 times that of ordinary patches; There is only a small amount of vulcanization, and the cross-linking density is small, so the pulling force is not enough; there is basically no vulcanization pressure, and the patch is not tightly bonded. Some low-quality patches are simply glued on, and cannot repair large wounds. They are only suitable for Repair of small wounds; ③Larger wounds need to be repaired twice, once to repair the wound, and then apply the patch after the wound is repaired, which is troublesome and unreliable to operate; ④Vulcanized glue is highly toxic and harmful to the body

But there are also certain disadvantages: ①The vulcanization temperature is too high, exceeding the critical temperature of rubber products. For example, the critical temperature of tires is 125°C. Ultra-high temperature will cause aging and scorching of tire rubber and skeleton materials, and will damage the inner liner of tires. , the quality of the repair cannot be guaranteed, and it cannot be used for the repair of nylon tires and tubeless tires, especially for high-temperature vulcanization of tubeless tires, which will cause bubbles in the airtight layer and air leakage, and the repaired tires cannot be retreaded; ② vulcanization The pressure is not uniform, the mechanical pressure is used externally, and there is a phenomenon of forced strain on the rubber product, resulting in a decrease in strength. The internal pressure is provided by the air bag, but the expansion of the air bag is limited, and the pressure in some places is insufficient, resulting in the patch not being firmly attached; at the same time, due to vulcanization Insufficient pressure leads to poor repair quality; ③Large power consumption and long vulcanization time, for example, the power consumption of vulcanizing a tire is about 15 degrees; ④The equipment is heavy and laborious to operate; cannot be refurbished

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