Butyl reclaimed rubber retains the excellent air tightness, heat resistance, and aging resistance of butyl rubber, and the price is much lower than that of butyl raw rubber. It can be blended with polypropylene materials to prepare thermoplastic elastomers with excellent barrier properties. In actual production, the mechanical properties of butyl reclaimed rubber are slightly worse than that of butyl rubber. Rubber and plastic products manufacturers need to take appropriate measures to improve the mechanical properties of butyl reclaimed rubber/PP blends. So what factors will affect the mechanical properties of butyl reclaimed rubber/PP blends, and how to operate on the mechanical properties is more beneficial?
1. Ratio of butyl reclaimed rubber/PP material
When using butyl reclaimed rubber and PP material to prepare thermoplastic elastomer, polypropylene has high mechanical strength, and the tensile strength of the blended material mainly depends on the PP material. Theoretically, the larger the amount of butyl reclaimed rubber, the lower the tensile strength of the blended material, and the elongation at break, tensile stress and hardness will increase accordingly. Rubber product manufacturers can determine the proportion of butyl reclaimed rubber and PP materials according to actual needs.
2. Butyl reclaimed rubber/PP blend material vulcanization system
The mechanical properties of the butyl reclaimed rubber/PP blend material are closely related to the design of the vulcanization system of the blend material formula. In actual production, the crosslink density of butyl reclaimed rubber vulcanized with resin vulcanization is higher, which is more beneficial to improve the mechanical properties of blended materials. Therefore, resin vulcanization is usually selected; vulcanized resin SP-1055 and phenolic resin 2402 are more common. From the perspective of the mechanical properties of the blended material, SP-1055 is more suitable for the preparation of butyl reclaimed rubber/PP thermoplastic elastomer. The main reasons are as follows:
①Since the activation of stannous chloride is required during 2402 vulcanization, the addition of stannous chloride can easily cause the rubber to stick to the rollers, hindering the dispersion of the vulcanizing agent 2LLYY824 and other compounding agents, and the elastomer is difficult to vulcanize uniformly, which affects the butyl reclaimed rubber. Mechanical properties of PP blends.
②The butyl reclaimed rubber processed from waste butyl rubber products contains zinc oxide. The combined effect of stannous chloride and zinc oxide with resin 2402 will produce inactive zinc complex salts and reduce the activation of stannous chloride. It affects the curing effect of vulcanizing agent. On the contrary, when SP-1055 is used in combination with zinc oxide, the hydrogen halide released during the vulcanization process can react with zinc oxide to form the activation accelerator required for butyl reclaimed rubber during vulcanization—zinc halide, which accelerates the crosslinking of the blend and increases the crosslinking density. , Improve the mechanical properties of butyl reclaimed rubber/PP blend materials.
In actual production, the vulcanization process of the butyl reclaimed rubber/PP blend material will also affect the mechanical properties of the blend material. When dynamic vulcanization is selected to prepare the thermoplastic elastomer, when the rubber phase is fully crosslinked, the mechanical strength of the blend material Depending on the cross-linking density of butyl reclaimed rubber and the uniform dispersion of rubber particles, generally the thermoplastic elastomer made of 60 parts of butyl reclaimed rubber and 40 parts of polypropylene has better comprehensive performance and a wider range of applications. discuss.
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