Latex reclaimed rubber possesses the basic performance characteristics of natural rubber, including high strength, good elasticity, and low specific gravity. It can wholly or partially replace natural rubber in the production of products, effectively reducing production costs. When used in natural rubber products, if the amount of latex reclaimed rubber is too low, the cost reduction effect is not significant; if the amount is too high, it may affect the physical properties of the finished product. So, what is the optimal blending ratio of latex reclaimed rubber in natural rubber products?
Latex reclaimed rubber is made from waste latex, waste natural rubber, and their products, through processes such as crushing, desulfurization, and refining. It retains the basic performance characteristics of natural rubber, is highly compatible with natural rubber, and can be used in any proportion. In actual production, there is no fixed universal optimal ratio for blending latex reclaimed rubber with natural rubber; it is generally determined according to the performance requirements of the natural rubber products and the physical properties of the latex reclaimed rubber.
1. Blending ratio of latex reclaimed rubber in common natural rubber products
When using natural rubber as the main raw material to produce high-performance rubber products such as rubber tires, rubber joints, sealing strips, automobile seals, high-damping shock pads, and high-quality sponge rubber shoe soles, the blending ratio of latex reclaimed rubber should be controlled among 20%-35%. For medium-grade rubber products such as automobile steering wheel covers, ordinary industrial rubber sheets, and conveyor belt covers, where performance requirements are moderate, the blending ratio of latex reclaimed rubber should be controlled at 30%-60%. For general molded products, such as low-grade rubber mats, miscellaneous rubber parts, and shoe sole filling layers, where color or mechanical strength requirements are not high, the blending ratio of latex reclaimed rubber can be increased to over 70%, and it is even possible to use reclaimed rubber entirely.
2. Factors to consider when determining the blending ratio of latex reclaimed rubber in natural rubber products
When using latex reclaimed rubber to replace an appropriate proportion of natural rubber in product manufacturing, the following factors need to be considered:
(1) Compatibility differences among different types of natural rubber and latex reclaimed rubber: High-grade smoked sheet rubber has a narrower molecular weight distribution and is more sensitive to the “dilution effect” of reclaimed rubber. When using smoked sheet rubber as the main raw material, the proportion of reclaimed rubber should be appropriately reduced.
(2) Consider the physical property indicators of latex reclaimed rubber: Latex reclaimed rubber with a high rubber content has a high effective rubber hydrocarbon content, making its performance closer to that of natural rubber, allowing for a slightly higher blending ratio. For reclaimed rubber with a low rubber content, the blending ratio should be appropriately reduced.
(3) Consider the stress conditions of the natural rubber product: When producing static seals with natural rubber, the blending ratio of latex reclaimed rubber can be appropriately increased; for dynamically reciprocating products such as O-rings, the blending ratio of reclaimed rubber needs to be strictly controlled.
(4) Consider the vulcanization system of natural rubber products: When using a traditional sulfur vulcanization system, the blending ratio of latex reclaimed rubber can be relatively high; when using peroxide vulcanization or resin vulcanization, due to the influence of retarding substances in the reclaimed rubber, it is recommended to reduce the blending ratio by 5%-10%.
So, what is the optimal blending ratio of latex reclaimed rubber in natural rubber products? This is really uncertain. Latex reclaimed rubber is inexpensive and has good processing performance, making it an ideal raw material to replace high-priced natural rubber. Reasonable blending of latex reclaimed rubber in natural rubber products can not only significantly reduce raw material costs but also improve rubber flow and reduce product shrinkage and deformation. Natural rubber product manufacturers need to determine the optimal blending ratio of latex reclaimed rubber based on the product’s usage scenario and performance requirements.
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