Stabilizing Agent To Prevent Oxidation Reaction
Stabilizer is difficult to meet the needs of PVC processing and use, rare earth stabilizer is generally combined with other stabilizer, according to different PVC products, Stabilizer processing needs of different processing equipment, rare earth stabilizer synthesis technology, the type of anion-cation ion in products and the choice of proportion, the different rare earth Composite heat stabilizer is obtained.
Stabilizer is mainly according to this mechanism; In addition, there are metal soaps, organotin, phosphite esters and epoxy ester is also the role of this mechanism.
A chlorine atom on an unstable allyl base in a polyvinyl chloride molecule, Stabilizer or a chlorine atom on a tertiary carbon level.
The stabilizer of metal soaps, phosphite esters and organotin compounds can be used in this mechanism.
The stabilizer reacts with free radicals, stops the transfer of free radicals, captures free radicals, and prevents oxidation reactions.
The stabilizer of Organotin and Phosphite is based on this mechanism.
The conjugate double bond of the multi-ene structure is added to the reaction, Stabilizer inhibiting the growth of the conjugate chain and destroying the formation of the large conjugate system to reduce the coloring.
The stabilizers for organotin and epoxy esters work in this mechanism.
Decompose hydrogen peroxide to reduce the number of free radicals.
The stabilizer of Organotin and Phosphite is a function of this mechanism.
Passivation of metal ions with catalytic dechlorination of hydrogen chloride.
The same stabilizer may have a function or several different mechanisms. Stabilizer To achieve the purpose of heat stability.
We often see the formula of PVC plastic, and there are several stabilizers joined together, its role lies in this. is to prevent it from various aspects of the degradation of polyvinyl chloride in order to ensure its stability during thermal processing.
Classification of stabilizers
The stabilizer generally divides it into 7 major categories: 1. Salt-based lead salts, 2. Metallic soaps, 3. Organic tin, 4. Rare Earth, 5 compound and other, 6. Stabilizer.