The processing of waste rubber products into a certain degree of fine rubber powder, recycling to rubber and plastic products to reduce the cost of raw materials, is the main way of circulating solid rubber waste; in the processing of rubber products, the rubber powder It can be used as a host material or added to the raw materials of the product in the form of a filler; wherein the softening plasticization system design directly affects the physicochemical properties of the rubber powder.
During the processing of rubber products, the softening plasticizing system can improve the fluidity and viscosity of the rubber compound, improve the calendering and extrusion process, and increase the amount of filler, reduce the heat of rubber mixing, and promote the dispersion of powder compounding agent to a certain extent. Aromatic oil, pine tar, rosin, coumarone resin, etc. are common softeners. The most commonly used plasticizer is DOP. The most commonly used rubber powder is coumarone resin and DOP.
1. The effect of Gumalon on the physical properties of rubber powder
Gumalon has solid and liquid components. The molecular structure of solid coumarone contains double bond heterocyclic ring and linear paraffin. It has good compatibility with rubber, promotes uniform dispersion of powder compounding agent in rubber compound, and vulcanizes. The dissolution of stearic acid and filler is beneficial, and the double bond structure can also be cross-linked to provide a certain reinforcing effect; the polar part of the solid coumarone molecular structure has a barrier effect on the macromolecular segment, thereby increasing the molecule. The distance between the segments reduces the force of the macromolecular machine and improves the plasticity. The use of coumarone in the rubber powder material can improve the mechanical properties of the rubber powder material, including tensile strength, tensile stress, etc.; vulcanization has a long flattening period and good processing safety, but the vulcanization rate is slow and easy to coke burn.
2.DOP influence on the physical properties of rubber powder
DOP has good comprehensive performance, high plasticizing efficiency, good low temperature and softness. It is not easy to be volatilized in the early use, low in water absorption and good in electrical performance. It is the most widely used plasticizer in the rubber and plastics industry; DOP can weaken rubber and plastic molecules. The interaction between the softening temperature, melting temperature, glass transition temperature, softness, impact resistance and elongation at break; and its polar portion can increase the distance between molecules and reduce the intermolecular force. Reduce the hardness of the material to improve flexibility and elasticity. Compared with the solid coumarone, the use of DOP in the rubber powder has a fast vulcanization speed, a short vulcanization flat period, and relatively poor processing safety. Since the DOP has no reinforcing effect in the rubber powder, the mechanical properties of the prepared material are better than those of the ancient horse. Long is low.
The use of coumarone in rubber powder can significantly improve the mechanical properties of the material, but Gumalon itself has high price, low efficiency and relatively poor plasticizing effect; low DOP price and good plasticizing effect, but processing safety and mechanical properties of finished products Need to be improved; therefore, companies using rubber powder need to choose a suitable softening plasticizing system according to actual needs.
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