Natural latex reclaimed rubber has the basic performance characteristics of natural rubber, has good elasticity in the hand, and has high mechanical strength. It is widely used in the production of natural rubber products, effectively reducing the cost of raw materials. Molded sponge rubber is light in weight, soft in texture, and has good elasticity. It has good cushioning, shock absorption, sound insulation and heat insulation effects during use. Generally, natural rubber is used as the main raw material. In actual production, the rational use of reclaimed latex rubber can effectively reduce the cost of raw materials while ensuring the performance of the molded sponge rubber product.
1. Choose the natural reclaimed rubber
When using natural latex reclaimed rubber to reduce the production cost of molded sponge rubber, the following three aspects can be considered.
One is the color: under normal circumstances, black reclaimed latex rubber can be used for black molded sponge rubber, white reclaimed latex rubber or colored latex reclaimed rubber for light and colored sponge rubbers, and the price ratio of black latex reclaimed rubber with the same index The price of white natural reclaimed rubber is low. The second is mechanical strength: selecting latex reclaimed rubber that is close to the tensile strength, elongation at break, and constant elongation stress of the finished molded sponge rubber can increase the amount of reclaimed rubber. The third is environmental protection requirements: if the molded sponge rubber is environmentally friendly and tasteless, you should choose environmentally friendly reclaimed latex rubber or odorless natural reclaimed rubber. It is recommended to choose products that can provide relevant test reports.
2. Replacement ratio of natural reclaimed rubber
After the molded sponge rubber is added with latex reclaimed rubber, the amount of reclaimed rubber will not only affect the mechanical strength of the finished product, but also affect the appearance and the degree of rise of the semi-finished product. In actual production, 15 parts of natural reclaimed rubber can replace about 10 parts of natural rubber. The foaming degree and appearance of molded sponge rubber semi-finished products are better; the physical and mechanical strength of vulcanized rubber is closer to the molded sponge rubber made of pure natural rubber.
3. Properly adjust the vulcanization formula
When using natural reclaimed rubber to reduce the production cost of molded sponge rubber, it is necessary to appropriately adjust the rubber formula, especially the vulcanization formula, to match the foaming speed. In actual production, when using 22LYY15 latex reclaimed rubber alone or using natural rubber/natural reclaimed rubber and rubber to prepare molded sponge rubber, the foaming system usually chooses foaming agent H and baking soda; sulfur-accelerator is recommended for the vulcanization system For the system, it is recommended to use accelerator M as the main vulcanizing agent, with a small amount of accelerator DM and a very small amount of accelerator TT.
4. Strictly control the rubber mixing process
When using natural rubber/latex reclaimed rubber and using rubber to prepare molded sponge rubber, it is recommended to masticate the raw rubber for a period of time; adjust the roller distance of the rubber mixer to the minimum and pass the natural reclaimed rubber 5-6 times thinly; then add a section The plastic compound is thinly passed about 5 times; if there are tire reclaimed rubber, sole reclaimed rubber, etc. in the formula, other reclaimed rubber compounds can be added at the end. In actual production, when natural reclaimed rubber produces low-cost sponge rubber products, it is necessary to appropriately adjust the vulcanization process conditions, etc. Later, the editor will have the opportunity to discuss related issues with you.
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