描述

Octyl tin mercaptide-Otm CAS 26401-97-8

OTM Usage

1. Catalyst: Otm can be used as an organotin catalyst for organic synthesis reactions such as esterification, cyclisation and condensation.
2. Preservatives: Otm can be used as an additive for metal anti-corrosion coatings to improve their corrosion resistance.
3. Plastic additives: Otm can be used as plastic additives to improve the heat resistance and light resistance of polymers.
4. lubricant: Otm can also be used as a lubricant to provide lubricating properties on the surface of materials.
5. It has good fluidity and strong thermal stability. It is suitable for calendering, extrusion and injection moulding of PVC food packaging rigid film and sheet. It is one of the heat stabilisers for PVC.

OTM Package

200kg steel plastic drum or IBC tank

OTM Storage

Store in a cool, dry and ventilated place, keep the container sealed. Keep away from fire, heat. Prevent entry into the mouth or eyes, splashed on the skin should be washed with soap timely. Prevent the inhalation of steam and smoke. Storage period 24 months.

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Mechanism of action of PVC heat stabilisers

1) Absorption and neutralisation of HCL, inhibiting its autocatalytic effect. This kind of stabiliser includes lead salts, organic acid metal soap, organotin compounds, epoxy compounds, phenol salts and metal thiol salts. They can react with HCL, inhibit the reaction of PVC off HCL.

2) Replacement of unstable allyl chloride atoms in the PVC molecule to inhibit the removal of PVC, such as organotin stabilizers and PVC molecules of unstable chlorine atoms occurring coordination bond, in the ligand, organotin and unstable chlorine atoms are replaced.

3) Addition reaction with polyene structure, destroy the formation of large conjugate system, reduce the colouring. Unsaturated acid salts or esters contain double bonds, and the conjugated double bonds in the PVC molecule undergo a bis-alkene addition reaction, thus destroying its conjugated structure and inhibiting colour change.

4) Capture free radicals and prevent oxidation reaction. Such as the addition of phenolic heat stabiliser can block off HCL, is due to the phenol given H atom radicals can be coupled with the degradation of PVC macromolecular radicals, the formation of substances that can not react with O2, and has a heat stabilizing effect. This kind of heat stabiliser can have one or several functions.
Ideal PVC heat stabilizer should be a multi-functional material, or a mixture of some materials, they can achieve the following functions: First, replace the active, unstable substituent; Second, absorption and neutralisation of HCL released during the processing of PVC, eliminating HCL autocatalytic degradation; Third, neutralisation or passivation of degradation of catalytic effect of metal ions and other harmful impurities; Fourth, through the Fourth, through a variety of forms of chemical reaction can block the unsaturated bond continues to grow, inhibit degradation of colouring; Fifth, it is best to have a protective shielding effect on ultraviolet light. Usually heat stabiliser according to their special performance with the use of separate cases are rare, and most varieties of powder, some are very toxic chemical substances. In order to use convenient, prevent dust poisoning, reduce toxic substances or replace them with non-toxic substances, in recent years, many kinds of composite stabilisers have been developed at home and abroad, for example, the world-famous German Bear composite stabilizers series, the United States, Germany, Japan, the Netherlands and other countries of the organotin or composite organotin stabilizers, have a considerable market in China. Therefore, to promote the application of our country’s development with high efficiency, low cost, no dust pollution and non-toxic or low-toxicity of the new composite stabiliser, is the urgent need for the development of China’s plastics industry.