Xu Xinhua secondary vulcanization silicone rubber seals products

Silicone rubber seal products quality factor

First, the quality of raw materials will lead to a silica gel silicone products difficult demolition side, poor quality of silicone raw materials less than its toughness, tear strength was significantly less in the process of demolition side is certainly very difficult to split the edge.

Second, the relatively thick forming part of the molding, then the flash is actually relatively thick, the thickness increases certainly lead to difficulties in demolition edges.

Third, environmental factors vulcanization, curing temperature should be appropriate, too low will lead to problems difficult demolition side, but the curing time also requires good control, curing time is too long will cause the product to become brittle, curing time is too short to It will lead sulfide link no effect, so the vulcanization links must control.

Fourth, the mold problem areas, if removed from the mold design is unreasonable, excessive use of mold, mold wear serious, mold quality, but off, etc. These conditions can lead to post-production molding is difficult to split edges.

Secondary vulcanization of silicone products called post-cure. The role of secondary vulcanization: The silicone rubber seals when peroxide cured, polymer initiator peroxide decomposition reaction of the low molecular weight compounds (such as benzene and benzoic acid, etc.) present in the rubber will affect the mechanical properties of rubber . Moreover, silicone rubber seals after the first stage of thermoforming, the crosslink density is not enough to make it further in order to increase the density of the vulcanization reaction of silicone rubber seals. Pulled strength, elasticity, hardness, degree of swelling, density, thermal stability sex than once vulcanization has greatly improved. without secondary vulcanization, perhaps by the production of silicone performance a certain impact, not better performance rubber seals. curing time parameters and the secondary parameters of vulcanization It may be different, which is related to the actual operation! vulcanized silicone variety, high temperature and room temperature. Exemplified by high-temperature silicone, not cured before what we usually say that the raw rubber, is to mix a lot of additives such as vulcanizing agents, mold release agents, etc., and refining and gum together. From the appearance can be seen at a glance. Hand said something on the break, there is no flexibility. If at a certain temperature of the kneaded rubber under certain temperature vulcanization molding products can be obtained, as we usually see silicone mobile phone sets, etc. As long as the drug is not toxic food manufacturers can provide certification to the general say they are non-toxic. Strict quality control of raw materials. Raw material checks part silicone seals of importance, however, is not detected on the use of raw materials of low quality grade silicone raw materials for food production tool, or the use of substandard glue and color additives in the production process for coloring, cause the product to health failed.

Since silicone rubber products seal member particularity safety requirements, food silicone products for the production process requirements are very strict, sufficient time after molding to remove volatile substances.

 

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Shenzhen Xu Xinhua Rubber Products Co., Ltd.