The reclaimed rubber from waste tires is widely used in the production of all kinds of rubber products to reduce production costs. Rubber waterstop is one of them. The rubber waterstop is mainly used for the foundation project that is set in the construction joint and deformation joint when the concrete is cast in situ and is integrated with the concrete structure. It is generally processed with natural rubber and synthetic rubber as raw materials. The proper mixing of recycled rubber from tires can effectively reduce the cost of raw materials and production energy consumption.
1. Key points for selection of reclaimed tire rubber for rubber waterstop
Traditional rubber waterstops generally use natural rubber as the main raw material, but the price of natural rubber is high and the processing fluctuation is large, and the manufacturing cost of waterstops is high. Compared with natural rubber, the price of reclaimed rubber 2ELYY930 is low and the price fluctuation is small. It can be used with natural rubber to produce rubber waterstop. When selecting the reclaimed rubber of tire for rubber waterstop, it is recommended to comprehensively consider the performance requirements of the waterstop and select products close to its technical indicators.
It is suggested to select high strength recycled tire tread with high tensile strength, high elongation at break and good elasticity, which can better ensure the quality of finished waterstop.
2. Key points of formula design for rubber waterstop mixed with recycled tire rubber
The formula of natural rubber waterstop needs to be adjusted after appropriate amount of recycled tire rubber is added to the formula of natural rubber waterstop. The rubber used for rubber waterstop shall have good waterproof, elasticity, wear resistance, aging resistance, deformation adaptability, etc.
When natural rubber is used as the main raw material to produce rubber waterstop, sulfur vulcanization is generally used, and zinc oxide can be used as the activator in combination with accelerator DM, accelerator CTP, accelerator NOBS, etc; Filling with appropriate amount of bentonite; When natural rubber/recycled tire rubber is used to produce rubber waterstop, antioxidant RD, 4010, 4020, etc. are generally used to improve the aging resistance of recycled rubber waterstop; Aromatic oil improves the processing properties of rubber compound.
3. Key points of process operation of rubber waterstop mixed with tire recycled rubber
When the natural rubber/recycled tire rubber is used to produce rubber waterstop, the natural rubber can be plasticized for three times first; Then, it is mixed with recycled rubber and compounding agent in internal mixer; After that, thin the sheet on the open mill; Install the mold in the curing press for curing.
(1) Key points of three stage plasticizing of natural rubber: for the first plasticizing, the natural rubber shall be wrapped in triangle bags and stored for 24 hours; After the second plastic refining, the 2-2.5cm thin sheet shall be stored for more than 24 hours; For the third time, the 1-1.5cm thin sheets shall be made and weighed, and stored for more than 24 hours.
(2) Key points for mixing of natural rubber and plastic, reclaimed tire rubber and compounding agent: add natural rubber and plastic, reclaimed tire rubber, bentonite, zinc oxide, sulfur, accelerator, antioxidant and aromatic oil into the internal mixer for mixing under the sealed condition at normal temperature and pressure, and the mixing time is about 15min.
(3) Vulcanization points of rubber waterstop produced by natural rubber/recycled tire rubber: control the curing temperature at 150 ℃, the curing pressure at 12MPa, and the curing time at about 15min.
The recycled tire rubber is the main way to recycle the waste tires. It can expand the application scope of the recycled tire rubber in various rubber waterstops, and can handle more waste tires. Later, Xiaobian will continue to share the application of the recycled tire rubber in rubber waterstops with you.
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