Plastic additives are widely used in the plastics industry. Plastic additives are auxiliary chemicals that need to be added during the production or processing of composite products. They are commonly referred to as plastic additives or "auxiliaries". Plastic additives have six roles in composites.
1. Stabilization of plastic additives Resin-based composite materials are prone to aging and deterioration during preparation, storage, processing and use, and their performance is significantly reduced. In order to prevent or delay the aging of composite materials, it is necessary to prepare and process composite materials. Adding a stabilizer in a class of plastic additives, also known as an antioxidant. Stabilized plastic additives mainly inhibit the aging process of composite materials produced by oxygen, light and heat during preparation, processing and application.
2, plastic additives can improve the mechanical properties of resin-based composite materials, in order to improve some of their mechanical properties, such as tensile strength, hardness, rigidity, impact strength, etc., can be added during the preparation of composite materials can improve the mechanics Performance of plastic additives. For example, epoxy resin-based composites have higher hardness and higher strength after cross-linking and solidification, but have poor toughness and imperfect impact resistance. In order to improve its impact resistance, plastic additives can improve toughness additives. .
3, plastic additives can improve the processing properties of composite materials in the preparation and processing process often add some diluted plastic additives to improve the processing properties of composite materials, such as improved fluidity and mold release. The addition of diluted plastic additives can reduce the viscosity of the resin, improve the wettability of the glue to the reinforcing material, and also facilitate the transfer of energy released during the curing process of the resin, and can appropriately extend the service life of the glue. The addition of a lubricant can improve the lubricity between polymer molecules and between the polymer and the reinforcing material, thereby improving the processability of the composite.
4, plastic additives play a role in flame retardant With the rapid expansion of composite materials in aviation, automotive, construction and electrical applications, the flame retardant performance requirements are also higher, the resin matrix composite matrix is ​​mostly The organic polymer composed of hydrocarbons is flammable. Therefore, in the processing of composite materials, it is necessary to add a kind of plastic additives which make the composite materials meet certain flame retardant requirements. These additives are commonly known as flame retardants.
5, plastic additives can improve the surface properties In order to prevent the static electricity generated during the processing and use of composite materials, the preparation of composite materials often add a class of surface-active plastic additives to improve the surface properties of composite materials, such plastic additives Including antistatic agents and antifogging agents.
6. Plastic additives can improve the appearance quality. In the processing or preparation of composite materials and their products, in order to improve the appearance quality of composite materials and their products, a kind of plastic additives which can give the composite materials a smooth appearance or various colors of the products are often added. Such plastic additives are colorants and lubricants.
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