The inner layer rubber of the cloth water transmission hose has strict requirements on the elasticity, flexibility, aging resistance, stiffness and shrinkage of the rubber. Generally, natural rubber and styrene-butadiene rubber are the main raw materials. When using tire recycled rubber in the inner rubber formula of the cloth water transmission hose produced by natural rubber / styrene butadiene rubber to reduce the cost and improve the process performance, in order to further improve the comprehensive performance of the water transmission hose, the rubber product manufacturer needs to adjust the water transmission of the cloth properly The type and amount of the compounding agent in each compounding system in the inner rubber formula of the hose.
1. Natural rubber / styrene butadiene rubber blended tire reclaimed rubber suitable formula
30 parts of natural rubber, 70 parts of styrene-butadiene rubber, 120 parts of tire reclaimed rubber, 4 parts of zinc oxide, 2.5 parts of stearic acid, 2.5 parts of anti-aging agent, 1.5 parts of paraffin, 3 parts of asphalt, 55 parts of carbon black N660, light calcium 50 Parts, 50 parts of clay, 3 parts of engine oil, 2.2 parts of accelerator, 3 parts of sulfur, total: 396.7 parts. The vulcanized rubber has a tensile strength of about 10 MPa, and an elongation at break of over 440%.
2. The principle of combined use of natural rubber / styrene butadiene rubber blended tire reclaimed rubber compounding agent
When a large amount of tire reclaimed rubber is used in the formulation of the water transmission hose made of natural rubber / styrene butadiene rubber, rubber product manufacturers can choose to use multiple compounding agents in combination to achieve the desired effect.
In general, the sulfur system can choose the DM / M combined accelerator system, with the DM as the main accelerator, and use them in a 3: 1 ratio. It has good aging resistance and is not easy to crack; when the accelerator DM and accelerator M are used together, the curing speed can be better adjusted so as to match the curing speed of other parts. Under normal circumstances, the vulcanization speed of the inner layer of the cloth-carrying hose should be close to that of the outer layer, but slower than the rubbing layer.
To improve the aging resistance of tire reclaimed rubber / natural rubber / styrene butadiene rubber compound rubber manufacturers can use chemical anti-aging agent and physical anti-aging agent paraffin together, of which chemical anti-aging agent 2LLYY518 can choose anti-aging agent A and anti-aging agent D The rubber layer has fatigue resistance and flexing resistance, and can inhibit harmful metals from corroding the inner wall of the hose.
3. How to use the compounding agent to further improve the processing performance of the cloth water delivery hose
When using tire reclaimed rubber / styrene butadiene rubber / natural rubber to produce cloth cloth water delivery hose, rubber product manufacturers can improve the fluidity, plasticity, stiffness and shrinkage of the rubber compound by adjusting the type of compounding agent. For example, carbon black N660 combines the high fixed tensile stress of high-definition furnace black, the processing performance of fast extruded carbon black, the high resilience of semi-reinforced carbon black, and the flexural flexibility of fine particle carbon black; rubber clay can be Improve tire reclaimed rubber / styrene-butadiene rubber / natural rubber compound processing technology performance and viscosity, improve rubber compound viscosity, reduce shrinkage, and ensure smooth extrusion of rubber hose.
When using tire reclaimed rubber to reduce the production cost of the inner layer rubber of the water transmission hose, the amount of reclaimed rubber, the type and dosage of the compounding agent need to be adjusted according to the specific needs of the cloth hose. If the quality of raw materials fluctuates, the formula must be adjusted in time; strict Control each production process of the cloth-delivery hose to ensure the smooth delivery of the water-delivery hose and avoid unnecessary losses.