Natural rubber, high tear strength, however, the use of latex reclaimed rubber instead of natural rubber to produce rubber products when the tear strength can not meet the requirements sometimes, so as to improve the tear resistance of latex reclaimed rubber is imminent, to improve the latex reclaimed rubber Product performance has an important role. So how to improve the tear strength of latex reclaimed rubber to ensure that the performance of the product is the same when it is used instead of natural rubber to produce rubber products?
1, latex reclaimed rubber products tear strength up to less than a large part of the reason is that the internal effective rubber hydrocarbon content is too low, this time under the conditions of cost and with a small amount of natural rubber to improve latex reclaimed rubber products containing plastic, at the same time Natural rubber larger molecular weight, higher crystallinity, which can effectively improve the tear strength of products.
2, the design of latex reclaimed rubber products formula, adjust the curing system, the best use of the traditional sulfur curing system, choose moderate activity, good flatness of the accelerator to adjust the cross-linked density of rubber products, cross-linked rubber latex products to improve the high temperature Tear strength, extend the life of rubber products.
3, sulfur-containing cross-link has a high tear strength peroxide curing system can be equipped with a small amount of sulfur.
4, select the appropriate filler to improve the latex reclaimed rubber tear strength, such as carbon black: generally with the carbon black particle size decreases, the tear strength increases, in the case of the same particle size, the lower structural carbon black It is advantageous to improve the tear strength.
5, latex reclaimed rubber added WCB, significantly improve the tear strength.
6, white carbon black latex reclaimed rubber and other types of reclaimed rubber commonly used reinforcing fillers, especially light-colored reclaimed rubber products, by adding surface treatment meteorological white carbon black rubber latex can enhance the physical and mechanical properties of reclaimed rubber, in particular Is the tensile strength and tear strength.
7, usually adding softener plasticizer will make the latex reclaimed rubber tear strength decreased, so appropriate to reduce the softener, plasticizer dosage.
8, by adding tear-resistant resin, (such as: HR-8019, R-1030) This type of resin is not suitable for food-grade tear rubber, after adding the pressure change data will be more suitable for sulfur curing system can not be used White latex reclaimed rubber products, but its long-term use at high temperatures.
The rubber product manufacturers can adopt two or more measures to improve the high-temperature tear resistance of latex reclaimed rubber, and reasonably adjust the tear strength of the product without affecting other indicators.
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