How to choose die-casting release agent for die-casting mold

There are a lot of die-casting release agents on the market. Different die-casting release agents have different effects on die-casting molds. So what are the specific effects? Let’s take a look together below.

The choice of die-casting release agent The commonly used release agents are inorganic, organic and polymer. Inorganic mold release agents, such as talc powder, mica powder, pottery clay, white clay, etc. as the main components of the compound, are mainly used as a release agent for the film and semi-finished products in rubber processing.

Organic release agents include fatty acid soaps (potassium soap, sodium soap, ammonium soap, zinc soap, etc.), fatty acids, paraffin, glycerin, petrolatum, etc. The third type of release agent is a high polymer, including silicone oil, polyethylene glycol, low molecular weight polyethylene, etc., and their release agent efficiency and thermal stability are much better than organic release agents.

Mold release agents are usually divided into powder, semi-solid and liquid. The powder and semi-solid can be applied to the surface of the mold with a brush or hand like wax grease. The liquid can be sprayed or brushed on the surface of the mold to form an isolation film. The liquid release agent is preferably sprayed. Developed countries in the international industry mostly use release agents filled with metal spray cans. Due to the good sealing performance of the metal spray can, it can prevent the release agent from being oxidized or mixed with impurities, and can ensure the purity of the release agent when it leaves the factory. Large-scale injection molding equipment is installed indoors, with small changes in ambient temperature, and has no effect on the use of spray release agents. However, the temperature of the mold for compression molding should be considered, and a mold release agent with good thermal stability should be selected. Generally, the thermal decomposition temperature of the mold release agent for die casting is required to be higher than the mold temperature for molding. Otherwise, the phenomenon of carbonization will occur. For high-end products and secondary processing (such as painting and printing), a release agent suitable for secondary processing should be selected. In order to prevent environmental pollution, a mold release agent that is not easy to burn, has a low odor and toxicity is selected. In the selection of release agents, economy is an important factor that cannot be ignored. Poor quality release agents will cause cracks and wrinkles on the surface of the product, affect the appearance of the product and the service life of the mold, and cause environmental pollution. Choose high-quality spray release agent, the price is higher, but the comprehensive economic benefits are high.

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