Demoulding is an important process for molded rubber products, which directly affects the appearance quality of the product. Recycled rubber molded products will be added with a release agent to ensure that the rubber products can be released smoothly. The release agent has a great influence on the release of rubber products, so what are the requirements for the release agent? How to choose a release agent?
Silica gel system is mostly used for rubber release agent, among which the release agent is generally a spray can type silica gel diluent. Rubber release agent is divided into film, rubber tube and tire release agent, mold release agent will be used in tire production process. Film release agents are mostly fatty acid soap powder and inorganic powder, which are low in cost, but easily cause dust pollution in the production process. Paste film release agents, butyl rubber or natural rubber inner tire release agents avoid these problems. Polyethers and polyesters are useful as release agents for rubber hoses because of their good cleanability and residue-free properties. Tire release agents (release agents) can be applied to the bladder or to the embryo. Due to the strict requirements on mold release and mold release sustainability, it is necessary to use reactive silicone emulsion and silicone resin emulsion for mold release, one spray, and 12 consecutive mold releases. Silicone rubber release agents should be selected from fluorine-containing surfactants, fluorine-containing polyethers, etc.
During the vulcanization process of rubber products, the release agent is used to prevent the product from sticking to the surface of the mold, so that the rubber product can be released smoothly without tearing. The main function of the release agent is to make the demolding operation easier and prevent the rubber product from being damaged due to demoulding, so as to obtain a smooth and smooth product and ensure that the mold is used many times.
The function of release agent and release agent is to reduce the internal friction between rubber molecular chains or the external friction between rubber and mold, so that the material during processing has good operability, and the sulfide product has good mold release to ensure low surface roughness of the product.
The requirements of the rubber industry for mold release agents are: good thermal stability and chemical inertness; no corrosion of the mold surface; no residual decomposition; good appearance to the product; no influence on the color and performance of the product;
The greater the polarity of the rubber, the better the bonding effect. High bonding strength; natural rubber, silicone rubber and isobutyl rubber have low polarity and weak adhesion. In addition, rubber surfaces often contain mold release agents or other free additives, which can hinder the bonding effect.
When producing reclaimed rubber molded products, manufacturers of rubber products should choose a suitable release agent and strictly follow the operation procedures so that the products can be demolded smoothly. Return to Sohu for more information.
When using the inner mold of the airbag, the rubber inflatable mandrel is coated with a release agent on the outer surface, and the inner mold of the airbag is subjected to a leak test (this is very important. If a leak is found during concrete pouring, the component will be destroyed). The airbag inner mold did not pull well into the rebar cage. When the inflation pressure of the rubber inflatable core mold reaches the object pressure, the concrete is poured. When the concrete is initially set, the inner mold of the airbag can be discharged to complete the molding of the product components without pollution.
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