The plastic we usually use is not a single component, it is made up of many materials. Among them high polymer polymer (or call synthetic resin) it is plastic main component, in addition, in order to improve the performance of plastic, add all sorts of auxiliary materials in high polymer compound even, wait like filler, plasticizer, lubricant, stabilizer, colouring agent, antistatic agent, ability makes the plastic with good performance.
Plastic additives, also known as plastic additives, is a polymer (synthetic resin) during the molding process in order to improve its processing performance or to improve the performance of the resin itself is not enough and must add some compounds. For example, in order to reduce the molding temperature of polyvinyl chloride resin, to make products soft and added plasticizer; For example, in order to prepare light, anti-vibration, heat insulation, sound insulation foam plastic and to add foaming agent; The thermal decomposition temperature of some plastics is very close to the processing temperature of molding. Therefore, the assistant agent of plastic plays an important role in plastic molding.
Folding synthetic resin
Synthetic resin is the most important component of plastics, its content in plastic is generally 40%~100%. Because of its large content and the properties of resins that often determine the properties of plastics, resins are often considered synonymous with plastics. For example, polyvinyl chloride resin and polyvinyl chloride plastic, phenolic resin and phenolic plastic confused. Actually resin and plastic are two different concepts. Resin is a kind of raw polymer compound, which is not only used for making plastics, but also for coating, adhesive and synthetic fiber. And plastic contains 100% outside very few resins, great majority of plastics, besides main component resins, still need to add other material.
Fillers, also known as fillers, increase the strength and heat resistance of plastics and reduce their cost. For example, wood powder added into phenolic resin can greatly reduce the cost, making phenolic plastic become one of the cheapest plastics, but also can significantly improve the mechanical strength. Fillers can be divided into organic fillers and inorganic fillers, the former such as wood powder, rags, paper and a variety of fabric fibers, etc., the latter such as glass fiber, diatomaceous earth, asbestos, carbon black and so on. The content of filler in plastic is generally controlled under 40%.
Plasticizer, or plasticizer can increase the plasticity and softness of plastics, reduce brittleness, and make plastics easy to process and form. Plasticizer (plasticizer) is generally miscible with resin, non-toxic, odorless, light, heat stable high boiling point organic compounds, the most commonly used is phthalate ester. When producing polyvinyl chloride plastic for example, if join more plasticizer to be able to get soft qualitative polyvinyl chloride plastic, if do not add or add plasticizer less (dosage <10%), get hard polyvinyl chloride plastic.
Stabilizer is to point to maintain the stability of polymer plastic, rubber, synthetic fiber and other reagents to prevent its decomposition and aging. In order to prevent synthetic resin in the process of processing and use by the role of light and heat decomposition and damage, extend the service life, to add stabilizer in the plastic. Commonly used are stearate, epoxy resin and so on. Stabilizer dosage is generally 0.3~0.5% of the plastic.
Colorants give plastics a variety of bright, beautiful colors. Organic dyes and inorganic pigments are commonly used as colorants. The natural color of synthetic resin is mostly white translucent or colorless transparent. Colouring agents are often used in industrial production to add color to plastic products.
The function of lubricant is to prevent the plastic from sticking to the metal mold when forming, and at the same time to make the plastic surface smooth and beautiful. Commonly used lubricants are stearic acid and calcium magnesium salt.
Prevent plastic in heating forming or in the process of high temperature use by heat oxidation, and make plastic yellow, hair crack.
In addition to the above-mentioned auxiliaries, flame retardants, foaming agents, antistatic agents, conductive agents, magnetic conductors, compatibilizers and so on can also be added to plastics. To meet the different requirements of use.
Folding antistatic agent
Plastic is an excellent insulator, so it is easy to carry static electricity, and antistatic agents can give plastic with mild to medium conductivity, thus preventing the accumulation of static charge on the product.