The plastic we usually use is not a pure substance, PVC Plastic Bags it is made of many materials. In addition, in order to improve the performance of plastic, but also in the polymer to add a variety of auxiliary materials, such as fillers, plasticizers, lubricants, PVC Plastic Bags stabilizers, additives, Coloring agent, etc., PVC Plastic Bags can become a good performance of plastic.
Synthetic resin is the most important component of plastic, its content in the plastic is generally 40% to 100%. Due to the large content, and the nature of the resin often determines the nature of the plastic, so people often see the plastic synonym for the plastic. For example, PVC Plastic Bags the PVC resin and PVC plastic, phenolic resin and phenolic plastic confused. In fact, resin and plastic are two different concepts. PVC Plastic Bags Resin is an unprocessed original polymer, it is not only used in the manufacture of plastic, but also paint, adhesives and synthetic fiber raw materials. The plastic in addition to a small part of the 100% resin, PVC Plastic Bags the vast majority of plastic, PVC Plastic Bags in addition to the main component of the resin, but also need to add other substances.
Fillers, also known as fillers, PVC Plastic Bags can improve the strength and heat resistance of plastics and reduce costs. For example, adding phenolic resin to wood powder can greatly reduce the cost of phenolic plastic to become one of the cheapest plastic, but also significantly improve the mechanical strength. PVC Plastic Bags Fill can be divided into two types of organic fillers and inorganic fillers, such as wood flour, rags, paper and a variety of fabric fibers, the latter such as glass fiber, diatomaceous earth, PVC Plastic Bags asbestos, PVC Plastic Bags carbon black and so on.
Plasticizer can increase the plasticity and flexibility of plastic, reduce the brittleness, make plastic easy to shape. Plasticizers are generally compatible with resin, non-toxic, odorless, light, heat stable high boiling organic compounds, the most commonly used is phthalate esters. For example, PVC Plastic Bags the production of PVC plastic, if the addition of more plasticizers can be soft PVC plastic, PVC Plastic Bags without or less plasticizer (dosage <10%), then the rigid polyvinyl chloride plastic The
Polyvinyl chloride resin is an amorphous structure of thermoplastics. In the ultraviolet light, hard PVC produce light blue or purple white fluorescence, soft PVC is issued blue or blue and white fluorescence. PVC Plastic Bags The temperature at 20 ℃ when the refractive index of 1.544, PVC Plastic Bags the specific gravity of 1.40, and add plasticizer and filler products density is usually in the range of 1.15 ~ 2.00, PVC Plastic Bags soft PVC foam density of 0.08 ~ 0.48, rigid foam 0.03 ~ 0.08. PVC water absorption of not more than 0.5%.
The physical and mechanical properties of polyvinyl chloride depend on the molecular weight of the resin, the content of the plasticizer and the filler. The larger the molecular weight of the resin, PVC Plastic Bags the higher the mechanical properties, the cold resistance and the thermal stability, PVC Plastic Bags but the processing temperature is also high and the molding is difficult; PVC Plastic Bags the low molecular weight is opposite to the above. Increased filler content, reduced tensile strength.