Sponge rubber sole has the characteristics of light texture, good elasticity, good tear resistance and good shock absorption effect, and is widely used in the production of various shoe materials. Traditional sponge rubber soles are generally made of natural rubber or natural rubber/styrene-butadiene rubber as the main raw material. Natural rubber is expensive and fluctuates greatly; latex reclaimed rubber is a low-cost replacement material for natural rubber, which can replace natural rubber. Production of sponge rubber soles reduces costs.
1. Key points for reclaimed rubber selection
When using latex reclaimed rubber for sponge rubber soles to reduce costs, manufacturers should base on the performance requirements of sponge soles (including color, tensile strength, elongation at break, Shore hardness, Mooney viscosity, etc.), market price of reclaimed rubber 2YLYY1217, and production cost budget Wait for the selection of suitable latex reclaimed rubber. Choose latex reclaimed rubber products that are close to the physical properties of sponge soles.
In general, it is recommended to use white latex reclaimed rubber for white and light-colored rubber soles, and black natural reclaimed rubber for black sponge soles to reduce more costs; use environmentally friendly latex reclaimed rubber and odorless latex reclaimed rubber to avoid irritation during the production and wearing of sponge soles Sexual odor and toxic gas; choose high-fineness, impurity-free latex reclaimed rubber to ensure smooth foaming; choose low-volatile latex reclaimed rubber to promote the smooth completion of the vulcanization and foaming process.
2. Mixing ratio of reclaimed rubber
After the natural rubber sponge sole is reasonably blended with reclaimed latex rubber, the foaming rate of the sponge rubber is higher than that of the pure natural rubber sponge sole. The appearance and dimensional stability of the finished product are better, the vulcanization reversion is not easy to occur, and the production process is smoother. In actual production, the amount of reclaimed latex rubber should be determined according to the effective rubber hydrocarbon content of the reclaimed rubber and the index of sponge soles. Under normal circumstances, about 10-30 parts of latex reclaimed rubber can be mixed with 100 parts of natural rubber, and latex reclaimed rubber can be completely used in some black sponge rubber soles, which can effectively reduce the cost of raw materials under the premise of ensuring product quality.
3. Key points of formula adjustment
When using latex reclaimed rubber/natural rubber together to produce sponge rubber soles, the general foaming system chooses foaming agent H to mix with baking soda for foaming; the vulcanization system chooses sulfur vulcanization, with accelerators M/DM/TT, zinc oxide, and stearic acid , Better coordinate vulcanization speed and foaming speed. The filling system can use calcium carbonate, and the amount of calcium carbonate in the black sponge sole should not be too much. The softening system can use common engine oil to improve the performance of rubber processing technology.
4. Key points of rubber mixing process
When using latex reclaimed rubber/natural rubber combined with rubber to produce sponge rubber soles, the natural rubber can be fully masticated first; then the roller distance of the rubber mixer is adjusted to the minimum to thin the latex reclaimed rubber (recommended 3-5 times); Then combine the natural rubber plastic compound and reclaimed rubber together; the subsequent mixing process is basically the same as the mixing process of pure natural rubber sponge soles, reasonable control of mixing time, mixing pressure, mixing temperature, etc., the editor and you later Discuss related issues in detail.
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