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In the production process of compounding silicone rubber, we encountered the most phenomenon is the structuring of the compounded silicone rubber. So what is the structuring of the compounded silicone rubber? Common point to say that the mixing of silicone rubber storage time is too long will lead to rubber hard plasticity reduction, or mixing of silicone rubber in the production process is not the correct ratio of materials, in the production of structuring difficult to refine the rubber this phenomenon.
Another terminology is used to say that the active silanol group on the surface of silica particles at room temperature and the raw rubber molecule is not the end of the silanol group condensation occurs, which leads to the rubber hardening, plasticity is reduced; another theory is that due to the surface of the Si-OH silica and the rubber molecule of the Si-O bond or the end of the Si-OH group to generate hydrogen bonding, and even the chemical bonding, so that the linear polysiloxane into a pseudo-crosslinked or micro-crosslinked semi-cohesive solid structure, so that the rubber hardened. Elastic state solid structure, so the rubber becomes hard, plasticity is greatly reduced.
Mixing silicone rubber structuring phenomenon the longer the storage time the more serious structuring, the only solution can only be dealt with by refining, if the refining still can not solve this problem, then we have to go through a high temperature mixing process. In addition, we can also put the unstructured rubber in small batches and structured rubber for mixing, this method can be quickly refined structured rubber, so that it returns to the original state.
Silicone rubber compounding preservation period can be up to a year, but theoretically can be semi-permanent storage, the longer the structuring phenomenon is more serious, we only need to structure the material for refining can be. The structuring phenomenon of compounded silicone rubber usually occurs more in high hardness silicone and fumed silicone. However, with today's technology, the structuring phenomenon of compounded silicone rubber has been greatly reduced.
Another terminology is used to say that the active silanol group on the surface of silica particles at room temperature and the raw rubber molecule is not the end of the silanol group condensation occurs, which leads to the rubber hardening, plasticity is reduced; another theory is that due to the surface of the Si-OH silica and the rubber molecule of the Si-O bond or the end of the Si-OH group to generate hydrogen bonding, and even the chemical bonding, so that the linear polysiloxane into a pseudo-crosslinked or micro-crosslinked semi-cohesive solid structure, so that the rubber hardened. Elastic state solid structure, so the rubber becomes hard, plasticity is greatly reduced.
Mixing silicone rubber structuring phenomenon the longer the storage time the more serious structuring, the only solution can only be dealt with by refining, if the refining still can not solve this problem, then we have to go through a high temperature mixing process. In addition, we can also put the unstructured rubber in small batches and structured rubber for mixing, this method can be quickly refined structured rubber, so that it returns to the original state.
Silicone rubber compounding preservation period can be up to a year, but theoretically can be semi-permanent storage, the longer the structuring phenomenon is more serious, we only need to structure the material for refining can be. The structuring phenomenon of compounded silicone rubber usually occurs more in high hardness silicone and fumed silicone. However, with today's technology, the structuring phenomenon of compounded silicone rubber has been greatly reduced.
