Category introduction of common additives and lubr

2022-08-02
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The function of lubricant is to improve the fluidity of resin and the demoulding property of products in plastic processing, prevent defects caused by adhesion in the machine or mold, and visually inspect the change of gauge length on the sample. It is usually added to the molding compound or coated on the surface of the mold cavity. Common lubricants are fatty acids and their salts, long-chain aliphatic hydrocarbons. According to the mechanism of lubricant, it can be divided into external lubricant and internal lubricant

(1) external lubricant: this lubricant has poor compatibility with the resin used for molding, so it is commonly used in molding machines or molds. A lubricating layer is formed between it and the resin to facilitate resin flow and product demoulding, such as paraffin

(2) internal lubricant: the phase high and low temperature experiments of this kind of lubricant and resin are generally limited by the travel of the testing machine (the travel of the testing machine when installing the standard fixture). A large part of the cost comes from the power battery. It is often mixed into the resin to reduce the melt viscosity of the resin and improve its fluidity. Such as butyl stearate, lead stearate, etc. Stearates are both good lubricants and effective stabilizers

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