Focus on modified plastics to improve the processing properties of modified plastics

The processing of plastics is a process from plastic raw materials (resins + additives) to products with a certain strength. Thermoplastic resins and thermosetting resins vary in their processing.

The processing properties of improved plastics are mainly concentrated in the following aspects.

(1) Increasing the thermal decomposition temperature of the resin

(2) lowering the melting temperature of the resin

(3) Improve the processing fluidity of the resin

(4) Improve the melt characteristics of the resin

The mechanism of action of plasticizer

Plasticizer refers to a kind of substance which can improve the plasticity of polymer. It is mainly used for PVC resin. The amount of PVC can be more than 98% of the total amount of plasticizer. In addition to PVC, plasticizers are also used in polymers such as PVDC, CPE, SBS, polyvinyl acetate, nitrocellulose, Pa, aBS and PVa.

The main role of plasticizers is as follows

a, reduce the polymer melting temperature and melt viscosity, thereby reducing its molding processing temperature.

b. The polymer article has softness, elasticity and low temperature resistance.

The specific mechanism of action of plasticizers is as follows

a, volume effect

b, shielding effect

Lubricant mechanism

The role of the lubricant is to reduce the friction between the materials and the surface of the material and processing equipment, reduce the flow resistance of the melt from the surface, reduce the melt viscosity, improve the fluidity of the melt, avoid the adhesion of the melt to the equipment, and improve The surface finish of the product, etc.

Common lubricants

(1) Classification of lubricants

a. According to the classification of lubricating components, there are mainly saturated hydrocarbons, halogenated hydrocarbons, fatty acids, fatty acid esters, aliphatic amides, metal soaps, fatty alcohols and polyols.

b. According to the action classification of lubricants, it can be divided into internal and external lubricants. The distinction between internal and external lubricants depends mainly on the compatibility with the resin. The internal lubricant has a large affinity with the resin, and its function is to reduce the force between the macromolecules; the external lubricant has a small affinity with the resin, and the effect is to reduce the friction between the resin and the processing machine.

Common lubricants

According to the composition of the lubricant, it can be divided into: saturated hydrocarbons, metal soaps, aliphatic amides, fatty acids, fatty acid esters and fatty alcohols.

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