Components, Types and Properties of Water-based Mold Release Agents

Water-based release agent is also water-soluble release agent, refers to the internal components of the release agent can be completely dissolved with water, the general industry are used in the emulsion of compounds such as methyl silicone oil, and emulsions are water-soluble, you can get good heat-resistant performance, and easy to clean, anti-corrosion, good fire resistance, environmental pollution is small, in the transport path, storage is safer.

Water-based mold release agents are different from traditional oil-based or solvent-based mold release agents in many ways due to the large amount of water. The release effect of the water-based release agent relies on the film deposited on the surface of the cavity after spraying with a thickness of only micrometers. Therefore, there are higher requirements in the selection of ingredients and the use of technology. But its advantages are also obvious, such as conducive to automatic operation, good cooling effect, no accumulation, improved surface quality of castings, reduction of internal pores, safe use, clean production, and reduced environmental pollution.

Water-based mold release agent has strong adhesion, can preferentially adhere to the mold without passing to the molding parts, and also can play a modified role on the resin surface, which is conducive to resin fluidity and improve the quality of the surface of the molding parts, and is widely used in the mold and silicone rubber, plastic and other products of mold release.

1. Product Ingredients

Generally speaking, water-based mold release agents consist of at least three components: base material, emulsifier and water. The base material can be considered as the active ingredient, which ultimately plays the role of mold release lubricant. The materials used are generally oils, greases, waxes, polymers and silicone substances. The role of the emulsifier is to uniformly disperse the above materials in a continuous aqueous phase with very fine particles to form a stable emulsion. Water is used only as a carrier.

The main components of water-based mold release agents made by emulsification using refined oils and various additives are: mineral oil, animal and vegetable oils, synthetic grease, natural paraffin, synthetic paraffin, silicone oil, solid (lubricant), emulsifier, additive, mold inhibitor, rust inhibitor.

Most of the high-quality release agents are formulated from 15~25 kinds of raw materials, and if the key ingredients or additives are changed by 1%, the release characteristics may be very different, and the cost and price will also bring a big change. Each type of release agent has its best application range and object, if the wrong object is used, then the quality of the product can not play its performance. Water-based release agent generally does not contain solid particles, can be diluted with water more than ten times to a hundred times, the water content generally accounts for more than 95%.

2. Category

According to the category of effective mold release substances in water-based mold release agents, they are mainly divided into three categories: silicone oil type, wax type, and fatty acid type.

1, Silicone oil water-based release agent: silicone oil and silicone oil derivatives are more suitable as polyurethane mold release agent, which has good mold release, such as an aluminum alloy molding casting with mold release agent, consisting of silicone oil, special pressure lubricant, emulsifier and water. Over the years, it has been proved that silicone oil and its derivatives have a good mold release effect. However, when the molded products need to be secondary processing, such as post-painting, silicone oil-based mold release agents have certain side effects.

2, Wax water-based release agent: polyurethane molding products used in the mold release agent to wax-based, wax has good mold release properties. Early wax is added to organic solvents to make mold release agent, recently reported that the wax can be added to water and made into a suspension of water-based mold release agent, the wax used for natural wax or synthetic wax such as polyethylene wax. This type of release agent is mainly used in the production of soft foam.

3, Fatty acid water-based mold release agent: this kind of mold release agent contains components of advanced fatty acid esters, fatty acid salts, other additives and water. It is used in the production of hard and soft foam mold products.

3. Characteristics

1. Fast film formation, water erosion resistance to protect the template, no residue; waterproof and rust-proof.

2. Excellent isolation performance, concrete surface clean, flat and pollution-free. 

3. Easy to demould, after demoulding, the surface can be kept smooth and flat, the angles are neat and undamaged.


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