Sponge rubber shock-absorbing pads have good elasticity, shock absorption, chemical corrosion resistance, etc., and are widely used in construction, transportation, industrial equipment, sports facilities and other fields, and are mostly processed with natural rubber as the main raw material. Latex reclaimed rubber has the basic performance characteristics of natural rubber, which can be used alone or combined with natural rubber to produce sponge rubber shock-absorbing pads, which can effectively reduce production costs on the premise of ensuring the quality of sponge rubber shock-absorbing pads.
1. Latex reclaimed rubber and natural rubber are used together to produce sponge shock-absorbing pad vulcanization formula
80 parts of natural rubber, 20 parts of latex reclaimed rubber, 5 parts of zinc oxide, 7 parts of stearic acid, 1 part of antioxidant D, 10 parts of spray carbon black, 20 parts of light calcium, 65 parts of barium sulfate, 15 parts of dibutyl phthalate, 3 parts of foaming agent H, 1 part of urea, 7 parts of water, 1.25 parts of accelerator DM, 2.55 parts of sulfur; Total 237.8 copies.
50 parts of natural rubber, 50 parts of latex reclaimed rubber, 2 parts of zinc oxide, 6 parts of stearic acid, 2 parts of antioxidant D, 2 parts of paraffin, 30 parts of spray carbon black, 15 parts of petroleum jelly, 5 parts of asphalt, 4 parts of foaming agent H, 1 part of urea, 5 parts of water, 0.9 parts of accelerator DM, 2.5 parts of sulfur; Total 175.4 copies.
20 parts of natural rubber, 80 parts of latex reclaimed rubber, 4 parts of zinc oxide, 6 parts of stearic acid, 2 parts of antioxidant RD, 2 parts of paraffin, 55 parts of light calcium, 9 parts of carbon black N774, 20 parts of engine oil, 4 parts of foaming agent H, 1.6 parts of accelerator CZ, 0.1 part of accelerator TMTD, 0.9 parts of sulfur; Total 204.6 copies.
2. Key points of the design of the sponge rubber shock-absorbing pad formula mixed with latex reclaimed rubber
(1) The ratio of natural rubber and latex reclaimed rubber
According to the performance requirements of the shock absorbing pad, different proportions of natural rubber and latex reclaimed rubber can be selected. Natural rubber provides excellent elasticity and fatigue resistance, and latex reclaimed rubber can maintain good processability and abrasion and aging resistance while reducing costs. The compound of sponge rubber needs to have enough plasticity to ensure uniform foaming. The combined rubber of natural rubber and latex reclaimed rubber should be fully plasticized to ensure that the plasticity reaches more than 0.5.
(2) Design of vulcanization system
Natural rubber/latex reclaimed rubber is used to produce sponge rubber shock absorbing pads, and sulfur is mostly used as vulcanizing agent, and the dosage is controlled at 1.5-3.0 parts, and accelerators DM, CZ, TMTD, etc. are combined with sulfur to improve vulcanization efficiency E4LYY517 and match the decomposition speed of foaming agent. In actual production, the matching of vulcanization speed and foaming speed is the key to sponge rubber production. Too fast vulcanization can lead to uneven porosity, while too slow can cause the compound to over-foam. The vulcanization system should be designed in such a way that the rate of vulcanization matches the rate of decomposition of the blowing agent.
(3) Design of foaming system
Foaming agent H is a commonly used foaming agent for sponge rubber shock absorbing pads, and the dosage and decomposition temperature need to be adjusted according to the thickness and performance requirements of the product; Urea and water can assist in foaming and optimize the cell structure: the size and uniformity of the cells can be controlled by adjusting the amount of blowing agent and the vulcanization system. The cell structure of sponge rubber directly affects its shock absorption and sound insulation performance.
(4) Design of filling system: light calcium, spray carbon black, barium sulfate and other fillers can be used to adjust the density and mechanical properties of the rubber compound. The addition of filler should ensure uniform dispersion to avoid uneven cells caused by filler aggregation.
(5) The design of the anti-aging system: the porous structure of sponge rubber makes it have a large surface area and is easy to age. Therefore, it is necessary to add high-efficiency antioxidants to the formula, such as antioxidant D, 4010, etc.
When using latex reclaimed rubber to reduce the production cost of sponge rubber shock absorbing pads, reasonable design of vulcanization formula is the key to ensure product performance. By optimizing the combined ratio of natural rubber and latex reclaimed rubber, vulcanization system, foaming system and filling system, the production cost can be significantly reduced and the economic benefits can be improved under the premise of ensuring the performance of the shock absorbing pad.
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