P-type rubber waterstop is a common waterproof material for water conservancy projects, mainly used for sealing and waterproof of gates, dam bottoms, tunnels, culverts and other projects, with high elasticity, good compression deformation, strong adaptability to deformation and other characteristics, with natural rubber or synthetic rubber as the main raw material, formed by high temperature and high pressure vulcanization process. When natural rubber produces P-type rubber waterstops, the appropriate use of reclaimed rubber can effectively reduce the cost of raw materials on the premise of ensuring the performance of the waterstop.
1. Performance requirements of P-type rubber waterstop
The rubber waterstop uses the high elasticity and compression deformation of rubber to produce elastic deformation under various loads and play the role of tightening and sealing. Therefore, the P-type waterstop requires high compressive strength and good elasticity, and has strong adaptability to deformation. Maintain the required elasticity during use, and will not become soft in summer and brittle in winter; It has good weathering resistance; It is suitable for engineering environments where the water contains a small amount of acid, alkali, oil or seawater.
2. P-type rubber waterstop vulcanization formula
(1) Vulcanization formula of P-type rubber waterstop for natural rubber production: 100 parts of natural rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 2 parts of antioxidant, 2 parts of paraffin, 50 parts of furnace carbon black, 8 parts of softener, 0.8 parts of accelerator, 2.5 parts of sulfur; Total 172.3 copies.
(2) Natural rubber/reclaimed rubber combined production of P-type rubber waterstop vulcanization formula: 100 parts of natural rubber, 30 parts of reclaimed rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 2 parts of antioxidant, 1.5 parts of paraffin, 35 parts of furnace carbon black, 15 parts of calcium carbonate, 10 parts of softener, 1.9 parts of accelerator, 2.6 parts of sulfur; Total 205 copies.
3. Key points of P-type rubber waterstop formula design mixed with reclaimed rubber
When natural rubber/reclaimed rubber is used together to produce P-type rubber waterstops, the design formula needs to comprehensively consider the performance of the waterstop, processing technology and cost-effectiveness. When using natural rubber as the main raw material to produce P-type rubber waterstops, natural rubber can provide good elasticity and flexibility; With an appropriate amount of reclaimed rubber, the waterstop can effectively reduce the cost of raw materials under the premise of maintaining good tensile strength and elasticity.
The expansion rate is an important indicator to measure the sealing performance of water-stopping rubber, the higher the expansion rate, the greater the expansion degree of water-stopping rubber after being soaked in pressure or water, and the tighter it is when filling the gap, so as to effectively prevent the penetration of water, gas and other substances. However, an excessively high expansion rate may also cause excessive internal stresses when the material is not fully expanded, affecting its long-term use effect.
In the formula of P-type rubber waterstop, the expansion rate of the rubber compound with high glue content is generally greater than that of the rubber compound with low glue content, the expansion rate of the rubber compound with more filling amount is smaller than that of the rubber with less filling amount, and the expansion rate of the rubber compound using fast-pressing furnace black is E4LYY716 much smaller than that of the groove carbon black filled with the same number of parts. The combined use of natural rubber/reclaimed rubber to produce rubber waterstop requires reasonable control of the glue content, the use of sulfur vulcanization, the accelerator DM/NOBS, etc., and the activator zinc oxide; Add antioxidant RD/4010/4020 and so on appropriately to improve the aging resistance of rubber waterstops.
P-type rubber waterstop rubber material should have good elasticity, wear resistance, aging resistance and adaptability to deformation; It has good processability, which is convenient for mixing, forming and vulcanization; On the premise of ensuring product quality, try to increase the amount of low-cost raw materials to meet the waterproof needs of different engineering environments and reduce production costs. When natural rubber produces P-type rubber waterstop mixed with reclaimed rubber, it is not only necessary to reasonably design the formula, but also to properly adjust the plasticizing, mixing, and vulcanization process parameters, and discuss related issues with you later.
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