There are a wide variety of release agents based on the main raw materials:
pure oil
Including various vegetable oils, animal oils and mineral oils, can be equipped with release agents. But at present, most of them use mineral oil, that is, various light lubricating oils produced by the petroleum industry, such as mechanical oil. According to foreign experience, pure oil release agent is best mixed with 2% surfactant (emulsifier, lubricant) to make concrete surface without pores and reduce chromatic aberration. In order to reduce costs, many units use industrial waste oil, but waste oil There are many impurities, which are more likely to contaminate the concrete surface. Some waste oils may also contain harmful substances such as sulfuric acid and polyvinyl chloride (PCB), so choose carefully. Pure oil release agent can be used for steel and wood formwork, and has a certain influence on the quality of concrete surface.
Emulsified oils
Emulsified oil is mainly made of petroleum lubricating oil, emulsifier and stabilizer, and sometimes anti-rust additives are added. Replacing pure petroleum lubricating oil with emulsified oil can not only save a lot of oil, but also improve the demolding quality and reduce the demolding cost. This release agent can be divided into water-in-oil (W/O) type and oil-in-water (O/W) type, and is generally used for steel or wooden molds. Dry easily after brushing. Some are dried to form a film, which can be reused many times, saving both labor and materials, and greatly reducing the cost of demolding. The water-in-oil release agent has been widely used in the United States, but many units in our country use the oil-in-water release agent with good results. After demoulding, the concrete surface is smooth and the color is uniform. Therefore, it is believed that as long as the oil-in-water mold release agent has a suitable oil content and ensures the stability of emulsification, the quality of use can be completely guaranteed. The key to the preparation of high-quality emulsified release agent is the choice of emulsifier. Commonly used emulsifiers include anionic and nonionic cationic types, which are most desirable. Use of emulsifiers and nonionic cationic complexing agents. Although the emulsified oil release agent has many advantages, its composition contains a lot of water, and it is easy to freeze in winter.
Paraffin
Paraffin wax has good mold release properties. After heating and melting, add an appropriate amount and stir well. Paraffin release agent can be used on steel, wood formwork and concrete seating. When paraffin wax content is high, paraffin residues tend to be left on the concrete surface. Due to the bonding of the concrete surface, its application range is limited.
fatty acids
This release agent usually contains solvents such as gasoline, kerosene, benzene, turpentine, etc. U.S. has stearic acid and benzene solution (1:1); aluminum stearate and kerosene solution; petrolatum and kerosene solution (diluted petrolatum with kerosene, plus 10% aluminum oleate (by weight); fatty acid and alcohol solution; Fatty acid and amine (or base) compounds.
paint
This release agent is expensive, but it can be reused many times and the price is still right. Some domestic units use alkyd varnish as a release agent. It can also be reused many times. As a release agent, the paint should be resistant to alkali, water and friction.
Synthetic material solution.
Synthetic materials such as silica gel are widely used in mold release agents. An emulsifier comes with silica gel, fatty acid, emulsifier, etc.
waste
It is a good measure to reduce the cost of the release agent by using the waste of industrial and agricultural products to configure the release agent. Using these materials under certain conditions can achieve better results. Domestic use of alkaline pulp waste liquid from paper mills, adding appropriate amount of oil. These are all existing release materials and cannot be produced and promoted as mass-production products.
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