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Lubricants are an important component in formulation design and have a large impact on the surface gloss, quality and yield of the product. It should be noted that it is matched with the stabilizer in the formulation to make it compatible with the lubricity of the stabilizer, so that the material can reach the lubrication balance during the extrusion or injection molding process, and obtain high-yield and high-quality products. The following Jiuzhi plastic nets list the inherent slip properties of several stabilizers and the types of lubricants used:
1. In a single-screw extruder, the amount of external lubricant should be appropriately reduced, and the internal lubricant should be appropriately increased to accelerate the extrusion of the melt. In the twin-screw extruder, the amount of external lubricant is appropriately increased, and the internal lubricant is appropriately reduced, and a high-yield and high-quality product can still be obtained.
2. In the process of extrusion and injection of hard products, the internal lubrication is the focus, but the external lubricant is also added to achieve the balance between internal lubrication and external lubrication.
3. When using a copolymer resin, it is necessary to add an external lubricant than a pure polyvinyl chloride resin. When the amount of the filler is large, a large amount of the internal lubricant is used.
4, metal soap can be considered as a lubricant, but can not be used too much, generally no extrusion formula in the extrusion process, no more than 2 PHR. Due to the action of soap and hydrogen chloride to produce free fatty acids, it can cause blooming. If there is a filler in the formulation, it can reduce or avoid the frosting effect of the lubricant.
5. If there is a modifier such as chlorinated polyethylene in the formulation, since it will promote the melting itself, the internal lubricant must be appropriately reduced to achieve the lubrication balance.