It is understood that rubber release agent is generally divided into external and internal use of two. The traditional release agent is generally topical, that is coated on the surface of the cavity, and is also known as a release agent. The products are talc, mica, soap, paraffin, polytetrafluoroethylene and silicone oil. Have a certain stripping effect, but with easy to leave mold and traces of the mold has a corrosive effect, the price is more expensive and other shortcomings. Among the many mold release agents, fluorine and silicon release agents are suitable for stripping molds due to their stripping effect, and are two kinds of release agents which have developed rapidly in recent years.
The main requirements for the release agent are: have a certain thermal stability and chemical inertia, does not corrode the cavity surface; in the cavity surface residual decomposition products; does not affect the product color, but can give a good appearance, non-toxic; Preparation, easy to use.
Rubber release agent refers to a type of substance used to prevent the rubber product from adhering to the surface of the mold and to make it smooth and not to be torn. When used, it is sprayed or applied to the cavity surface to form an effective barrier. The use of rubber release agent is here.
Rubber release agent is between the mold and the product between the functional substances in the rubber, plastic manufacturing industry, manufacturing model products, in order to mold, improve production efficiency and extend the life of the mold, while the product smooth, qualified , To reduce waste, and the need to use an essential additive. Its main function is to make the stripping operation easy, to prevent the removal of the product caused by damage. Separation of release agent depends on its surface properties, its significant feature is the critical surface tension is small, it is difficult to be liquid wetting, because of this, in order to achieve the role of stripping.
Types of rubber release agents Classification:
1, rubber release agent: refers to the rubber products used to prevent the adhesion of the mold surface, and can make it a smooth mold without tearing a class of substances. When used, it is sprayed or applied to the cavity surface to form an effective barrier. The main requirements for the release agent are: have a certain thermal stability and chemical inertia, does not corrode the cavity surface; in the cavity surface residual decomposition products; does not affect the product color, but can give a good appearance, non-toxic; Preparation, easy to use.
2, fluoride release agent: fluoride release agent inherited the characteristics of fluorine-containing materials, can significantly reduce the surface energy of the solid, making it difficult to infiltrate and non-sticky, easy to dissolve with other substances, a good solution Finished product and the adhesion between the mold, the preparation of release agent, the amount of fluorine compounds is minimal. It is suitable for thermosetting resin, thermoplastic resin and various rubber parts. The surface of the molded article is smooth and the secondary processing performance is excellent, especially suitable for the stripping of fine electronic parts.
3, silicon release agent: silicone release agent is made of organic silicon oxide as raw materials, the advantages of good heat resistance, moderate surface tension, easy to become evenly separated membrane, stripping long life. The disadvantage is that after stripping the surface of the product has a layer of oil-like surface, the second processing must be carried out surface cleaning. Commonly used silicone oil, silicone rubber, silicone oil and silicone grease. Silicone release agent is the current rubber and plastic release agent mid-range market mainstream products, in the polyurethane, rubber, and other resin processing are widely used.
4, wax (oil) release agent wax oil series release agent is characterized by low prices, sticking performance, the disadvantage is pollution mold, the main varieties are:
① industrial Vaseline, directly used as release agent; ② paraffin wax, directly used as release agent; ③ sulfonated vegetable oil, directly used as release agent;
④ printing and dyeing oil (turkey oil, turmeric oil), in 100 copies of boiling water, add 0.9 to 2 copies of printing and dyeing oil made of the emulsion, than the soap water stripping effect is good;
⑤ polyethylene glycol (relative molecular mass 200 ~ 1500), directly for the release of rubber products.