Ca-Zn composite stabilizer for PVC (polyvinyl chloride) cables and preparation method of Ca-Zn composite stabilizer

Abstract

The invention discloses a Ca-Zn composite stabilizer for PVC (polyvinyl chloride) cables and a preparation method of the Ca-Zn composite stabilizer. The Ca-Zn composite stabilizer is prepared from raw materials in parts by weight as follows: 45-65 parts of calcium stearate, 15-25 parts of zinc stearate, 10-12 parts of dibutyltin maleate, 10-15 parts of hydrotalcite, 5-10 parts of oxidized polyethlene wax, 25-30 parts of compound calcium carbonate, 3-6 parts of pentaerythritol dimer ester and 10-15 parts of epoxy rubber seed oil, wherein compound calcium carbonate comprises micron-calcium carbonate and nano-scale calcium carbonate in the weight ratio of 1:(1-1.5). The invention further discloses the preparation method of the Ca-Zn composite stabilizer. The Ca-Zn composite stabilizer and the preparation method have the following benefits: through regulation of the ratio of the raw materials, the quality of the stabilizer is improved, the quality of the cables is improved, self-degradation of PVC is retarded, the service life of the cables is prolonged, and the maintenance cost is reduced.

Description

technical field [0001] The invention relates to a stabilizer and a preparation method thereof, in particular to a calcium-zinc composite stabilizer for PVC cables and a preparation method thereof. Background technique [0002] Heat stabilizers are a class of additives that can prevent or reduce self-degradation or crosslinking of polymers due to heat during processing and use, and prolong the service life of materials. They mainly include bases, metal soaps, composites and pure organics. Different types of stabilizers can inhibit the discoloration or deterioration of PVC during processing or use to varying degrees. The principle is mainly to use different components in the stabilizer to inhibit the thermal degradation of PVC by replacing unstable chlorine atoms, neutralizing hydrogen chloride and reacting with unsaturated parts. The demand and output of heat stabilizers increase with the demand and output of PVC cables, and are continuously improved according to the use env...

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Problems solved by technology

[0003] At present, PVC stabilizers are developing in the direction of high efficiency, non-toxicity, environmental protection and low cost. However, the progress of metal stabilizers is relatively slow, and the research and development of auxiliary heat stabilizers are unprecedentedly active, but auxiliary heat stabilizers are rarely alone. Use, often used in conjunction with the main agent, is the main direction of current development

[0004] The applicant combined the existing technology and long-term work practice, after many times of production use and follow-up observation, and found that although the performance of the existing PVC cables is good, there are still some defects, such as: thermal stability needs to be improved. Further improvement, due to the large dielectric loss of PVC, the heat generated during the use of medium and low voltage cables below 15kv will easily degrade PVC itself, shorten the service life of the cable, increase the cost of maintenance, and further improve Limit the use environment of PVC cables and narrow the scope of use

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