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There are many factors affecting the rubber shrinkage, but in general can be summarized in two major aspects.
1, raw materials, raw rubber varieties of different rubber due to different molecular structure, its shrinkage rate also has different degrees of difference. Rubber macromolecular chain entangled with each other, there is free space between the network, so the shrinkage margin is also large. When the other components of the rubber material into the gap, it is filled into the gap, compressed free space, so that the shrinkage rate decreased. Shrinkage of different rubber species can be reflected by their coefficient of linear expansion.
2, the process of crosslinking density with the deepening of the degree of vulcanization, crosslinking density is also increased, the network structure of the space is compressed, so that the shrinkage rate decreases. This is related to the amount of sulfur. For example, natural rubber with 3 parts of sulfur, the shrinkage rate of 1.5% ~ 2%, while the amount of sulfur in the hard rubber to reach more than 35 parts, the shrinkage rate decreased significantly. Plasticity and the plasticity of the rubber material, the greater the plasticity of the rubber material, the longer the storage time, the greater the shrinkage.
1, raw materials, raw rubber varieties of different rubber due to different molecular structure, its shrinkage rate also has different degrees of difference. Rubber macromolecular chain entangled with each other, there is free space between the network, so the shrinkage margin is also large. When the other components of the rubber material into the gap, it is filled into the gap, compressed free space, so that the shrinkage rate decreased. Shrinkage of different rubber species can be reflected by their coefficient of linear expansion.
2, the process of crosslinking density with the deepening of the degree of vulcanization, crosslinking density is also increased, the network structure of the space is compressed, so that the shrinkage rate decreases. This is related to the amount of sulfur. For example, natural rubber with 3 parts of sulfur, the shrinkage rate of 1.5% ~ 2%, while the amount of sulfur in the hard rubber to reach more than 35 parts, the shrinkage rate decreased significantly. Plasticity and the plasticity of the rubber material, the greater the plasticity of the rubber material, the longer the storage time, the greater the shrinkage.
