Rubber bulb is a kind of pure rubber hollow round, storage gas thin-walled products, according to the raw materials used can be divided into latex bulb, natural rubber bulb and synthetic rubber bulb. Natural rubber bulbs are processed from natural rubber as the main raw material, which has good elasticity, wear resistance, flexibility, etc.; Appropriate amount of reclaimed rubber can effectively reduce the cost of raw materials. In actual production, what reclaimed rubber can be mixed with natural rubber bulbs? How to design a formulation?
1. What varieties of reclaimed rubber can be mixed with natural rubber bulbs?
(1) The performance of latex reclaimed rubber is almost the same as that of natural rubber, with high mechanical strength and good elasticity, and the production of rubber bulbs with natural rubber can not only reduce the cost of raw materials, but also improve the processing performance of rubber compounds, and improve the aging resistance and dimensional stability of bulbs.
(2) Butyl reclaimed rubber has excellent air tightness, good ozone resistance and aging resistance; Natural rubber bulbs mixed with a small amount of butyl reclaimed rubber can improve the air tightness, heat resistance and aging resistance of the finished product.
(3) Chlorobutyl reclaimed rubber has good air tightness and barrier properties, heat resistance, aging resistance, chemical corrosion resistance, and can be added to the natural rubber bulb formula in small quantities to improve the processing technology performance of ball bile rubber, and the finished product is resistant to air permeability, heat resistance and aging.
(4) Tire reclaimed rubber has good compatibility with natural rubber, low price, and can be used in combination with natural rubber to produce rubber balls with low performance requirements, effectively reducing the cost of raw materials.
2. Natural rubber bulb bladder mixed with reclaimed rubber vulcanization formula
(1) Natural rubber and latex reclaimed rubber are used together to produce the main vulcanization formula of bulb: 90 parts of natural rubber, 10 parts of latex reclaimed rubber, 5 parts of zinc oxide, 1.5 parts of stearic acid, 1 part of antioxidant SP, 45 parts of light calcium carbonate, 20 parts of magnesium carbonate, 2.5 parts of lithopone powder, 1 part of coumaron resin, 0.4 parts of accelerator M, 0.4 parts of accelerator DM, 0.2 parts of accelerator D, 2 parts of sulfur; 179 in total.
(2) Natural rubber and latex reclaimed rubber are used together to produce spherical bile valve vulcanization formula: 85 parts of natural rubber, 15 parts of latex reclaimed rubber, 4.5 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant SP, 0.5 parts of paraffin, 20 parts of light calcium carbonate, 0.6 parts of accelerator D, 1.6 parts of accelerator M, 1.8 parts of sulfur; 131 in total.
Rubber bulb is a typical thin product, strict requirements for raw materials, generally natural rubber as the main raw material, in order to reduce the cost can be mixed with part of butadiene rubber, styrene-butadiene rubber or recycled rubber; Appropriate amount of butyl rubber E4LYY619 or butyl reclaimed rubber can improve the air tightness of the rubber. When mixing reclaimed rubber to reduce the production cost of natural rubber bulbs, it is necessary to choose high-strength latex reclaimed rubber with high fineness and no impurities (the glue content of the formula is controlled among 50% and 65%).
When the appropriate amount of reclaimed rubber is used to reduce the production cost of natural rubber bulbs, it is also necessary to strictly control the production process, such as the rubber needs to be filtered to remove impurities, and the hygroscopic compounding agent needs to be dried, crushed, sieved and other treatments; After mixing and filtering, the ball bile rubber material is added sulfur on the open mill and parked under the sheet to avoid scorching, etc. In the future, Xiaobian will continue to share with you the key points of rubber ball bile formula design and the problems that need to be paid attention to in the production process.
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