Plasticizer Ratio And Its Product Impact.
The effect of plasticizers on the properties of wood-plastic composites (WPC) and the addition of plasticizers can reduce the interaction between the PVC molecular chains and reduce the glass transition temperature, flow temperature, and the melting point of the contained microcrystals of PVC plastics. Plasticizers can improve the plasticity of the resin, making the product soft and resistant to low temperatures. When the plasticizer is less than 10 parts, the effect on the mechanical strength is not obvious. When about 5 parts of the plasticizer is added, the mechanical strength is the highest, which is the so-called anti-plasticization phenomenon. It is generally believed that the phenomenon of antiplasticization is the addition of a small amount of plasticizer, which increases the mobility of macromolecular chains and causes the ordering of molecules to produce microcrystals. Adding a small amount of plasticizer hard products, the impact strength is smaller than no time, but increased to a certain dose, the impact strength will increase with the increase in the amount to meet the universal law.
In addition, with the addition of plasticizers, the heat resistance and corrosion resistance of the products decreased. Every time a plasticizer was added, Martin Heat decreased by 2 to 3. Therefore, generally hard products do not add plasticizers or plasticizers. Sometimes plasticizers are added to improve processing fluidity. Soft products, on the other hand, require the addition of a large amount of plasticizer. The greater the plasticizer dosage, the softer the product. The types of plasticizers include phthalates, linear esters, epoxies, phosphate esters, etc. For its comprehensive performance, DOP is a better product and can be used in various PVC product formulations. Straight-chain esters such as DOS are cold-hardening plasticizers. They are used in agricultural films. They have poor compatibility with PVC. Generally, it is not more than 8 parts. Epoxy-based plasticizers have good cold resistance. With heat and light resistance, especially when used in conjunction with metal soap stabilizers, epoxy plasticizers generally use 3 to 5 parts. Wire and cable products need to be flame-retardant, and plasticizers with relatively good electrical properties should be used. PVC itself is flame-retardant, but plasticized soft products are mostly flammable. In order to make the soft PVC products flame-retardant, flame-retardant plasticizers such as phosphate esters and chlorinated paraffin should be added. These two types of plasticizers The electrical properties are also superior to other plasticizers, but as the amount of plasticizer increases, the electrical performance generally shows a downward trend. For non-toxic PVC products, non-toxic plasticizers such as epoxy soybean oil should be used. As for the total amount of plasticizers, they should be different depending on the softness requirements of the products and their uses, processes, and use environment. The general calendaring process produces PVC film. The total amount of plasticizer is about 50 parts. Blown film is slightly lower, generally 45 to 50 copies.