Dongguan Guangdong plastic bag factory to introduce the composition of plastic bags
What are the main ingredients of plastic bags?
Dongguan JMEI packaging plastic bag factory for you to introduce the composition of plastic
We usually use plastic is not a pure material, it is made up of many materials and mix.
The high polymer
(or synthetic resin) which is one of the main components of plastic, in addition, in order to improve the basic properties of plastics, but also add various auxiliary materials in the polymer, such as filler, plasticizer, stabilizer, lubricant, coloring agent and so on, it can become the good performance of plastics.
Synthetic resin is one of the most important components of plastics, which is generally in the plastic content of 40% ~ 100%. Because the content is large, and the nature of the resin will often determine the nature of the plastic, so people often think of resin as a synonym for plastics. For example, polyvinyl chloride resin and polyvinyl chloride plastics, phenolic resin and phenolic plastics. In fact, resin and plastic are two different concepts. Resin is an unprocessed raw polymer, which is not only used in the manufacture of plastics, but also as the raw materials for coatings, adhesives and synthetic fibers. In addition to a very small part of the plastic containing 100% of the resin, the vast majority of plastic, in addition to the main components of the resin, but also need to add other substances.
Fillers, also known as fillers, can improve the strength and heat resistance of plastics, and reduce costs. For example, the addition of wood flour in the phenolic resin can greatly reduce the cost, make the phenolic plastics become one of the cheapest plastic, and can significantly improve the mechanical strength. Packing can be divided into two kinds of organic fillers and inorganic filler, the former such as wood powder, rags, paper and all kinds of fabric, the latter such as glass fiber, diatomite, asbestos, carbon black.
Plasticizer can increase the plasticity and flexibility of the plastic, reduce the brittleness, so that plastic molding. Plasticizer is generally can be mixed with resin, non-toxic, odorless, light, heat stable high boiling organic compounds, the most commonly used is the two phthalic acid esters. For example, the production of polyvinyl chloride plastic, if you add a lot of plasticizers will be able to get soft polyvinyl chloride plastic, if you do not add or less plasticizer (dosage <10%), then the hard PVC plastic.
In order to prevent the decomposition and destruction of the synthetic resin in the process of processing and using the light and heat, and prolong the service life, the stabilizer is added into the plastic. Commonly used are stearic acid, epoxy resin, etc..
Coloring agent can make plastic with a variety of bright, beautiful colors. Common organic and inorganic pigments.
The function of the lubricant is to prevent the plastic from sticking to the metal mould while forming the plastic surface. Commonly used lubricants are stearic acid and its calcium and magnesium salts, etc..
In addition to the above additives, plastic can also be added to the flame retardant, foaming agent, antistatic agent, in order to meet the different requirements of plastic products.