What are the ingredients of the plastic bags produced by the plastic bag making machine?
The plastic we usually use is not a pure substance, it is made of many materials. Among them, high molecular polymer (or synthetic resin) is the main component of plastic. In addition, in order to improve the performance of plastic, various auxiliary materials such as fillers, plasticizers, lubricants, stabilizers, Colorants, etc., can become good performance plastics.
Plastic bag making machine
1. Synthetic resin
Synthetic resin is the most important component of plastic, and its content in plastic is generally 40% to 100%. Because of the large content, and the nature of the resin often determines the nature of the plastic, people often think of resin as a synonym for plastic. For example, mix polyvinyl chloride resin with polyvinyl chloride plastic, phenolic resin and phenolic plastic. In fact, resin and plastic are two different concepts. Resin is an unprocessed raw polymer, which is not only used to make plastics, but also as a raw material for coatings, adhesives and synthetic fibers. In addition to a very small part of plastic containing 100% resin, most plastics, in addition to the main component resin, also need to add other substances.
Fillers are also called fillers, which can improve the strength and heat resistance of plastics and reduce costs. For example, the addition of wood powder to phenolic resin can greatly reduce costs, making phenolic plastic one of the cheapest plastics, while also significantly improving mechanical strength. Fillers can be divided into organic fillers and inorganic fillers, the former such as wood flour, rags, paper and various fabric fibers, etc., the latter such as glass fiber, diatomaceous earth, asbestos, carbon black and so on.
Plasticizers can increase the plasticity and flexibility of plastics, reduce brittleness, and make plastics easier to process and shape. Plasticizers are generally miscible with resins, non-toxic, odorless, light- and heat-stable high-boiling organic compounds, and the most commonly used are phthalates. For example, in the production of PVC plastics, soft PVC plastics can be obtained if more plasticizers are added, and hard PVC plastics can be obtained if no or less plasticizers are added (amount <10%). .
In order to prevent the synthetic resin from being decomposed and destroyed by light and heat during processing and use, and to extend the service life, a stabilizer should be added to the plastic. Commonly used are stearate and epoxy resin.
Colorants can make plastics have various bright and beautiful colors. Commonly used organic dyes and inorganic pigments as colorants.
The role of the lubricant is to prevent the plastic from sticking to the metal mold during molding, and at the same time make the plastic surface smooth and beautiful. Commonly used lubricants include stearic acid and its calcium and magnesium salts.
In addition to the above additives, flame retardants, foaming agents, antistatic agents, etc. can be added to the plastic to meet different requirements.