Necessary auxiliary materials for the production of 20 litre plastic bucket
The 20 liter plastic bucket we usually use is not a pure substance, it is made of many materials. Among them, polymer (or synthetic resin) is the primary component of plastics. In addition, in order to improve the function of plastics, various auxiliary materials, such as fillers, plasticizers, lubricants, stabilizers, colorants, etc., should be added to the polymers, so as to become outstanding plastics.
1. Synthetic resin
Synthetic resin is the most important component of plastics, its content in plastic guess is generally 40% - 100%. Because of its high content, and the nature of resin often determines the nature of plastic, people often regard resin as a synonym of plastic. For example, PVC resin and PVC plastic, phenolic resin and phenolic plastic are confused. In fact, resin and plastic are two different concepts. Resin is a kind of raw polymer, which is not only used to make plastics, but also is the material of coatings, adhesives and synthetic fibers. While plastic contains a small part of 100% resin, the vast majority of plastics, in addition to the primary component resin, also need to participate in other substances.
Fillers, also known as fillers, can improve the strength and heat resistance of plastics and reduce costs. For example, joining wood powder in phenolic resin can greatly reduce the cost, make phenolic plastic one of the cheapest plastics, and improve the mechanical strength together. Fillers can be divided into organic fillers and inorganic fillers, the former is wood powder, rags, paper and various fabric fibers, the latter is glass fiber, diatomite, asbestos, carbon black, etc.
Plasticizers can increase the plasticity and softness of plastics, reduce the brittleness, and make plastics easy to be processed and formed. Plasticizers are generally high boiling point organic compounds that can be miscible with resins, non-toxic, odorless, light and heat stable, and the most commonly used ones are phthalates. For example, in the production of PVC plastics, if more plasticizers are added, soft PVC plastics can be obtained. If no or less plasticizers are added (dosage < 10%), rigid PVC plastics can be obtained.
In order to avoid the effect differentiation and damage of light and heat during the processing and application of synthetic resin, and to extend the service life, stabilizer should be added in the plastic guess. Commonly used stearate, epoxy resin, etc.
Colorant can make plastics have all kinds of gorgeous and beautiful colors. Organic dyes and inorganic pigments are often used as colorants.
The effect of lubricant is to avoid that plastic does not stick to the metal mold when forming, and together, the plastic surface can be lubricated and beautiful. Commonly used lubricants are stearic acid and calcium magnesium salt.