The rubber waterstop with natural rubber as the main raw material is processed by plasticizing, kneading, pressing and other processes with the cooperation of various compounding agents, and has good waterproof and shock absorption properties. Reclaimed rubber can replace natural rubber to produce rubber waterstop, effectively reducing the cost of raw materials. In actual production, reclaimed rubber is often used in combination with natural rubber to further improve the comprehensive indicators of rubber waterstops.
1. Reclaimed rubber and a small amount of natural rubber are used together to produce a reference formula for rubber waterstops
70 parts of reclaimed rubber, 15 parts of natural rubber, 15 parts of organic bentonite, 2.5 parts of zinc oxide, 1.5 parts of sulfur, 1.8 parts of accelerator, 1 part of antioxidant, 7 parts of aromatic oil; total: 113.8 parts.
2. Physical property requirements of rubber waterstop and rubber raw material selection skills
Rubber waterstop has the characteristics of good elasticity, wear resistance, aging resistance, tear resistance, etc. It is generally used in the construction of basement exterior walls and post-cast belts, and is affected by factors such as temperature, ozone, ultraviolet rays, and multiple deformations. When selecting the rubber raw material for the rubber waterstop, it is necessary to comprehensively consider the media that the waterstop is exposed to, including acids, alkalis, salts, oils, solvents and various corrosive gases. Among them, natural rubber can be used for ordinary rubber waterstops. It is recommended to use chloroprene rubber when it needs to be in contact with weak acid and alkali corrosive media. Nitrile rubber is used for waterstops in contact with oily corrosive media. Rubber waterstops used under low temperature conditions With multi-choice EPDM rubber.
In actual production, latex reclaimed rubber and tire reclaimed rubber can be used together with natural rubber to produce rubber waterstops with natural rubber as the main raw material, reducing raw material costs and production energy consumption on the premise of ensuring product quality. When reclaimed rubber 2ELYY624 and a small amount of natural rubber are used to produce rubber waterstops, it is recommended to choose reclaimed rubber products with tensile strength 12-15Mpa, elongation at break greater than 450%, and hardness 55-65 degrees.
3. Selection skills of rubber accessories for reclaimed rubber/natural rubber production of rubber waterstop
Bentonite has good hygroscopicity, thickening, high temperature stability, lubricity, water resistance, chemical stability, etc. After water absorption, the expansion ratio can reach more than 30 times, and it plays the role of water absorption and water stop in the production of rubber water stop. ;Organic bentonite has better dispersibility and higher activity in the reclaimed rubber/natural rubber combined rubber. As a filler, it can not only improve the performance of the waterstop, but also improve the processing technology of the rubber compound.
4. Technological skills of reclaimed rubber/natural rubber combined with rubber to produce rubber waterstop
When reclaimed rubber/natural rubber is used together to produce rubber waterstop, the natural rubber can be fully masticated and then blended with reclaimed rubber, organic bentonite, zinc oxide, sulfur, accelerator, anti-aging agent, and aromatic oil. It is recommended to use the mixing process. Internal mixer, under the sealing conditions of normal temperature and pressure. The vulcanization molding of the compounded rubber in the vulcanizer is generally carried out at a temperature of about 150°C and a pressure of about 12MPa, and the vulcanization time is controlled at about 15 minutes.
When the reclaimed rubber/natural rubber is mixed with rubber, the natural rubber can be plasticized three times in advance: the natural rubber is put into a triangle bag and parked for 24 hours → it is marked into 2-2.5 cm sheets and then parked for 24 hours → it is marked into 1-1.5 cm sheets and stored for 24 hours Enter the mixing process after an hour. There are still many points that need to be paid attention to when using reclaimed rubber to reduce the production cost of rubber waterstops. The editor will continue to discuss with you later.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits