In fact, any kind of plastic raw materials in the factory contains at least a certain percentage of stabilizers to prevent its degradation in storage, transportation, and processing. So the strict sense of “non-modified plastics” does not exist. However, the base resin produced by chemical plants is usually called “non-modified plastic”, or “pure resin”. But in our plastic extrusion processing, we often use a variety of modification methods together so that it can have a suitable and stable quality for some specific plastic mechanical requirement.
1, Reinforcement: by adding glass fiber, carbon fiber, mica powder, and other fibrous or flake fillers to achieve the purpose of increasing the rigidity and strength of the material. such as glass fiber reinforced nylon used in power tools.
2, Toughening: by adding rubber, thermoplastic elastomer, and other substances in the plastic to improve its toughness/impact strength, such as automotive, home appliances, and industrial use of common toughened polypropylene, etc.
3, Blending: two or more incompletely compatible polymer materials are uniformly mixed into a macro-compatible, micro-phase mixture to meet certain requirements for physical and mechanical properties, optical properties, processing properties, etc. method.
4, Alloy: similar to the blend, but the components are compatible with each other, easy to form a homogeneous system, and can obtain certain properties that can not be achieved by a single component, such as PC/ABS alloy, or PS modified PPO, etc.
5, Filling: by adding fillers in plastics to improve the physical and mechanical properties or reduce costs.
6, Other modifications: such as the use of conductive fillers to reduce the resistivity of plastics; add antioxidants / light stabilizers to improve the weather-ability of the material; add pigments/dyes to change the color of the material, add internal/external lubricants to improve the processing properties of the material, the use of nucleating agents to change the crystalline properties of semi-crystalline plastics to improve their mechanical and optical properties, etc.
In addition to the physical modification methods mentioned above, there are also methods to modify plastics with chemical reactions to obtain specific properties. such as maleic anhydride grafting of polyolefins, cross-linking of polyethylene, and the use of peroxides in the textile industry to degrade resins to improve flow/fiber formation properties.
In general, we also use a variety of modification methods together, such as the addition of rubber and other toughening agents in the process of plastic reinforcement modification in order not to lose too much impact strength; or the production of thermoplastic vulcanizates (TPV) in the presence of both physical mixing and chemical cross-linking, etc.
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