A kind of calcium zinc composite stabilizer and its preparation method and application

Abstract

The invention relates to a calcium-zinc compound stabilizer as well as a preparation method and application thereof. The calcium-zinc compound stabilizer is prepared from the following components in percentage by mass: 10 to 40 percent of fatty acid calcium salt, 5 to 20 percent of fatty acid zinc salt, 10 to 45 percent of hydrotalcite, 5 to 12 percent of beta-diketone, 2 to 8 percent of polylol, 1 to 5 percent of epoxy compound, 1 to 5 percent of antioxidant, 5 to 15 percent of lubricant and 2 to 5 percent of silica, wherein the silica is fumed hydrophilic silica; the specific surface area of the silica is 100m<2> / g to 335m<2> / g. The calcium-zinc compound stabilizer provided by the invention has the advantages that the long-time uninterrupted production without plating out can be carried out, a sizing sleeve is not frosted and a mold flowing passage does not generate scale formation at a higher production speed, and moreover, also has higher heat stability and favorable processing performance.

Description

technical field [0001] The invention relates to the technical field of chemical stabilizers, in particular to a calcium-zinc composite stabilizer and its preparation method and application. Background technique [0002] Polyvinyl chloride is widely used in electrical insulation materials, water supply and drainage pipes, door and window profiles and other fields because of its good chemical stability, flame retardant and self-extinguishing properties, and high insulation. It is one of the most widely used general-purpose plastics at present. . [0003] The thermal stability of polyvinyl chloride is a key factor affecting the quality of polyvinyl chloride products. Therefore, polyvinyl chloride stabilizers are usually added during the processing of polyvinyl chloride to improve its stability, so as to meet the requirements of the production process and actual use. need. PVC stabilizers mainly include lead salts, organotins, metal soaps and rare earths, etc. Among them, lead...

AI Technical Summary

Problems solved by technology

However, when the currently commercially available calcium-zinc composite stabilizer for polyvinyl chloride pipes produces small-sized pipes, if the appearance, color, dimensional stability, and physical properties of the pipes can meet the production requirements and related product standards, the production speed will be relatively low. Low (≤10M / min)

If the production speed is further increased, the production speed and product quality of the pipe in the early stage will basically remain unchanged. After 12 to 16 days of uninterrupted production, the torque will increase significantly, the sizing sleeve will frost, and the mold flow channel will be fouled. There is also a noticeable drop in performance

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