What are the characteristics of environmentally friendly calcium zinc stabilizers:
Calcium zinc stabilizers are nitric oxide synthases composed of calcium zinc organic salts, hypophosphite esters, polyether polyols, antioxidants, and organic solvents. Calcium zinc stabilizers have good compatibility with epoxy resins and thickeners, good transparency, and are not easy to precipitate. They are used in small quantities and are convenient to use. However, they have the disadvantage of weak wettability, reducing the softening point of the product, and long-term storage may cause mold growth. Solid state composite calcium zinc soap stabilizers are mainly composed of polyether soap, followed by lauric acid soap and fatty acid soap. The characteristic of calcium zinc stabilizers is good wetting, which does not reduce the softening point of PVC hard products, and is suitable for the production and processing of hard PVC pipes and PVC profiles. Products produced and processed from microemulsion technology can eliminate the aforementioned defects.
We mainly focus on two aspects to carry out improvements: in order to improve the coloring in the early stage, sufficient amount of zinc soap is added, and antioxidants are used to harmless treat zinc chloride, which becomes a high zinc compound and reduces the amount of zinc soap added to suppress zinc burning.
The use of preservatives to change the previous coloring process results in a low zinc combination, which is widely used not only in soft products but also in the thermal stability and clarity of calcium zinc stabilizers. It has also been successfully applied in the production and processing of hard products, in order to better maintain the calcium/zinc management system while preventing early coloring and suppressing zinc burning.
Generally, lead salts are only attached to the surface of PVC particles, and their effect is equivalent to blocking the binding between PVC particles, significantly delaying plasticization, reducing friction between PVC particles, and lowering the cutting effect inside PVC. The production equipment bears a lower load, and the amount of lead salt used is higher. The denser the particles of lead salt, the more significant the secondary effect. Traditional green and environmentally friendly products such as calcium zinc stabilizers have a strong electronegativity during the plasticization process. The optically active functional groups have a certain infectivity with the subacute connection points of PVC epoxy resin, producing a bond with extremely strong bond energy, which weakens or removes the attraction of ion bonds in various layers of PVC. This is the opening chain of PVC that is coiled with each other, making it easier for external diffusion. The molecular structure of functional groups makes it easier for PVC to spread. The middle boundary facilitates the plasticization of PVC epoxy resin.
Post time: Aug-19-2024
