High hardnessRubber sheets are widely used in industrial fields, such as automotive, construction, electronics and machinery industries, due to their high hardness and good elasticity to provide good compression and wear resistance, and to maintain their shape and function under high pressure. High-hardness rubber sheets have strict requirements for material properties, and traditional manufacturing methods rely on expensive raw materials, resulting in high costs; The rational use of reclaimed rubber and reclaimed rubber powder can effectively reduce costs without affecting the quality of high-hardness rubber sheets.
1. Characteristics of reclaimed rubber and reclaimed rubber powder
Reclaimed rubber is a rubber processed by recycling waste rubber products, through physical and chemical processes such as crushing, heating, mechanical and chemical treatment, with certain plasticity and physical and mechanical properties, easy to mix with raw rubber and compounding agent, can be used in whole or in part instead of raw rubber, good plasticity, low power consumption, easy to produce tablets, small expansion and contraction of unvulcanized rubber processing, can reduce the sensitivity of rubber to heat, less heat generation in processing, good vulcanization flatness, small vulcanization return to the original, can improve the aging resistance of rubber products.
Reclaimed rubber is widely used in various rubber products, which can not only improve the performance of rubber processing technology, but also effectively reduce the cost of raw materials.
Vulcanized rubber powder is made of waste rubber as raw material, crushed or ground by mechanical processing to make powdery substances with different particle sizes, adjustable particle size, good elasticity, wear resistance, good chemical stability, good thermal stability within a certain temperature range, and good anti-aging performance, easy to process, can be used in the manufacture of a variety of rubber products, to a certain extent, can improve the wear resistance and tear resistance of rubber compounds.
2. Application skills of reclaimed rubber and reclaimed rubber powder in high hardness rubber board
High-hardness rubber sheets are generally made of styrene-butadiene rubber, natural rubber, etc., which can be used with high styrene, reinforcing agents, vulcanizing agents, softeners, etc. Using styrene-butadiene rubber, high styrene, calcium carbonate, silica, vulcanizing agent and corresponding additives as the basic formula, mixed with recycled rubber 2SLYY118 resources, the physical properties of high-hardness rubber can be adjusted by changing the ratio of reclaimed rubber and reclaimed rubber powder and the amount of compounding agent, so as to reduce more costs on the premise of meeting the performance of high-hardness rubber sheet.
Basic formula: 100 parts of styrene-butadiene rubber, 70 parts of high styrene, 8 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant RD, 2 parts of antioxidant 4010NA, 35 parts of silica, 60 parts of calcium carbonate, 2 parts of polymer, 2.5 parts of accelerator CZ, 1.5 parts of DM promotion, 0.5 parts of accelerator TMTD, 8 parts of sulfur.
(1) Change the ratio of styrene-butadiene rubber to reclaimed rubber under the condition that the basic formula remains unchanged: with the increase of the number of reclaimed rubber, the tensile strength of the rubber plate gradually decreases, the elongation at break gradually increases, and the hardness tends to decrease; According to the tensile strength, hardness, elongation at break and other requirements of high-hardness rubber plate, the ideal mixing ratio of reclaimed rubber can be determined.
(2) Change the amount of sulfur under the condition that the basic formula remains unchanged and the proportion of reclaimed rubber is unchanged: with the increase of the number of sulfur parts, the cross-linking density of the molecular chain in the vulcanization process increases, and the hardness of the rubber material increases.
(3) Add rubber powder under the condition that the basic formula remains unchanged and the amount of reclaimed rubber remains unchanged; With the increase of the number of rubber parts, the tensile strength and hardness gradually decreased, and the elongation at break gradually increased. Similarly, according to the tensile strength, hardness, elongation at break and other requirements of high-hardness rubber sheet, the ideal mixing ratio of recycled rubber powder can be determined.
Reclaimed rubber and reclaimed rubber powder are an effective way to reduce the cost of high-hardness rubber sheets. When using recycled rubber resources to reduce costs, it is necessary to comprehensively consider the performance, cost and application environment of the material to ensure the best performance and economic benefits. Through reasonable design of formula and improvement of processing technology to optimize product performance, to meet the performance index requirements of high hardness rubber board in different use occasions.
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