Sponge rubber has the characteristics of low density, good elasticity, and resistance to flexing. It has obvious shock absorption, sound insulation and heat insulation effects during use. It is widely used in various fields, such as rubber soles and shock absorption equipment. In actual production, a large part of sponge rubber is processed with natural rubber as the main raw material. Latex reclaimed rubber can replace a certain proportion of natural rubber to produce sponge rubber, effectively reducing the cost of raw materials. In the production process of latex reclaimed rubber sponge products, strict control of plasticizing and mixing processes can effectively improve the yield of products.
1. Main points of plasticizing process of latex reclaimed rubber sponge products
Compared with dense rubber products, sponge rubber requires better plasticity of the rubber compound. When latex reclaimed rubber and natural rubber are used together to produce sponge rubber products, it is generally required that the degree of plasticity should be above 0.6. Among them, natural rubber 2ELYY523 is recommended to use four-stage mastication, and thin pass about 40-60 times. Latex reclaimed rubber has good fluidity and high plasticity. It is not necessary to perform multiple masticating and thinning. It can be properly masticated or directly mixed with fully masticated natural rubber.
2. Key points of the mixing process of latex reclaimed rubber sponge products
Mixing is an important process in the production process of rubber products. It is the process of uniformly dispersing the compounding agent in the raw rubber. The granular compounding agent is in the dispersed phase, and the raw rubber is in the continuous phase.
When using latex reclaimed rubber to produce sponge rubber products, the compounding agent cannot be uniformly dispersed, the material is agglomerated, or there are coarse particles or other impurities, which will cause the rubber material to form large pores during the foaming process, which will affect the quality of reclaimed rubber sponge products. Therefore, when the latex reclaimed rubber is used to prepare the sponge compound for mixing, it is necessary to ensure that the compounding agent is evenly dispersed; after mixing, it is parked for a week (or longer) before use, which is conducive to foaming.
3. Refining process points of latex reclaimed rubber sponge products
Latex reclaimed rubber or latex reclaimed rubber/natural rubber combined to prepare sponge rubber needs to be refined before vulcanization, and the roll distance should be relaxed before filming. Moisture absorbers such as calcium oxide, to eliminate air bubbles, especially for long-striped sponge rubber products using a pressureless continuous vulcanization process.
When using latex reclaimed rubber or latex reclaimed rubber/natural rubber to prepare sponge rubber products, it is not only necessary to select appropriate reclaimed rubber, rationally design formulas, but also strictly control the processes of plasticizing, mixing and refining, for subsequent vulcanization and foaming. Lay a good foundation to ensure that the latex reclaimed rubber sponge rubber is evenly foamed, effectively improve the yield, and avoid unnecessary losses.
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