The wear-resistant sandblasting hose is mainly used to transport materials containing solid particles, such as gravel, cement, concrete, etc. The inner and outer rubber layers have strict requirements on the abrasion resistance of the materials used, and generally use natural rubber, butadiene rubber, and styrene-butadiene rubber. Rubber or nitrile rubber is processed as the main raw material. When using natural rubber/butadiene rubber to prepare the inner layer rubber of sandblasting hoses, mixing with vulcanized rubber powder in an appropriate amount can further improve the tear resistance and wear resistance of the inner layer rubber while reducing costs.
1. Natural rubber + butadiene rubber
45 parts of natural rubber, 55 parts of butadiene rubber, 3 parts of zinc oxide, 1.7 parts of stearic acid, 0.8 parts of antioxidant, 60 parts of carbon black, 2 parts of aromatic oil, 5 parts of homogenizer, 2 parts of lubricant, 0.75 parts of accelerator Parts, 3.75 parts of sulfur; Total: 179 parts.
2. Natural rubber + butadiene rubber + vulcanized rubber powder
50 parts of natural rubber, 50 parts of butadiene rubber, 20 parts of vulcanized rubber powder, 3 parts of zinc oxide, 2.5 parts of stearic acid, 3 parts of antioxidant, 60 parts of carbon black, 6 parts of pine tar, 10 parts of coumarone, engine oil 5 parts, 1.6 parts of accelerator, 1.9 parts of sulfur; total: 213. parts.
In actual production, after mixing natural rubber/butadiene rubber with an appropriate amount of vulcanized rubber powder, the vulcanized rubber has abrasion resistance, flexural resistance, fatigue resistance, Crack resistance and crack resistance have been improved; it is recommended to use vulcanized rubber powder with 60 mesh or more for better blending effect.
3. Commonly used compounding agents for inner glue of sandblasting hose
(1) Vulcanization system: When using natural rubber/butadiene rubber and rubber to prepare the inner layer of sandblasting hose, sulfur is generally used for vulcanization. It is recommended to choose insoluble sulfur (ordinary sulfur migrates quickly in butadiene rubber, and insoluble sulfur can also Speed up the vulcanization rate, reduce the amount of sulfur, and improve the aging resistance of the product), with the accelerator NOBS, zinc oxide, stearic acid, etc. After natural rubber/butadiene rubber is used to fill part of the vulcanized rubber powder with rubber, it is recommended to use accelerator CZ with sulfur, which has good scorch resistance during vulcanization, short vulcanization time, and high safety.
(2) Reinforcement filling: When the natural rubber/butadiene rubber is used to produce the inner rubber of wear-resistant sandblasting hose, high wear-resistant furnace black is generally used, such as N330, which is easy to disperse in natural rubber and butadiene rubber and has a good reinforcement effect. , The vulcanized rubber has high tensile strength, tear resistance, abrasion resistance, and excellent elasticity; if necessary, the reinforcement filling system can also use semi-reinforcing carbon black, calcium carbonate, clay and other compounding agents to improve the process performance of the rubber , Reduce more raw material costs.
(3) Softening system and anti-aging system: Aromatic oil, pine tar, motor oil, etc. are all commonly used softeners in the preparation of the inner rubber for ordinary wear-resistant sandblasting hoses, and an appropriate amount of homogenizer, lubricant or coumarone resin can also be added. While ensuring the physical properties of the rubber compound, the process performance of the rubber compound is further improved. The anti-aging system can use a certain chemical anti-aging agent alone, or use two or more anti-aging agents together, such as anti-aging agent D and anti-aging agent 4010NA; to further improve the anti-aging performance of the inner rubber of the sandblasting hose and prolong the service life of the product .
In actual production, not only vulcanized rubber powder can be used for the inner rubber of the sandblasting hose, but also reclaimed rubber can be used. Later editors continue to share all kinds of rubber raw materials that reduce the production cost of the inner rubber of the sandblasting hose.
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