A kind of preparation method of whitening foaming agent

Abstract

The invention discloses a preparation method of a whitening foaming agent, comprising the following steps: S11, stirring and mixing sodium bicarbonate and a composite calcium-zinc stabilizer evenly; S12, performing jet crushing to obtain a semi-finished product A; S21, mixing citric acid After the salt and citric acid are mixed evenly, airflow milling is carried out; S22, the coating of the fatty acid and its derivatives on the citrate and citric acid is completed, and the semi-finished product B is obtained; S3, the preparation of the whitening foaming agent: the semi-finished product A Mix with the semi-finished product B, then add an appropriate amount of urea and its derivatives and epoxy compounds to obtain the whitening foaming agent; the mass ratio of the sodium bicarbonate to the composite calcium-zinc stabilizer is 100: (1-5) . The whitening foaming agent prepared by the preparation method of the whitening foaming agent of the present invention has an excellent foaming effect on polyvinyl chloride, moderate foaming rate, less heat in the foaming process, and can significantly improve the foaming effect of polyvinyl chloride. Whiteness, surface gloss, cell fineness, etc. of foam products.

Description

technical field [0001] The invention relates to the field of foaming agents, in particular to a preparation method of a whitening foaming agent, more particularly to a whitening foaming agent for polyvinyl chloride and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC for short) is one of the five general-purpose plastics in the world, among which rigid polyvinyl chloride foam has the characteristics of low density, geothermal conductivity, high chemical stability, and high energy absorption, and is widely used as heat insulation , Noise-reducing and shock-absorbing materials, especially suitable for the production and processing of bathroom cabinet boards, special boards for building templates, special boards for automobiles and ships, special boards for advertising engraving, and special boards for chemical anticorrosion. [0003] Polyvinyl chloride is a chain-like high polymer formed by the homopolymerization of vinyl chloride monomers. I...

AI Technical Summary

Problems solved by technology

[0003] Polyvinyl chloride is a chain-like high polymer formed by the homopolymerization of vinyl chloride monomers. Its decomposition temperature is lower than its glass transition temperature, and it is prone to dehydrochlorination and decomposition, which will cause discoloration of the product, affect the processing performance of polyvinyl chloride and cause mechanical damage to the product. Performance drop

The introduction of ultra-fine high-residue inorganic foaming agent sodium bicarbonate increases the strength of the melt, the fluidity of the melt becomes poor, and the heat generated by internal friction increases. Insulation performance and mechanical properties cause great adverse effects; the introduction of exothermic AC foaming agent (azodicarbonamide) leads to local overheating of PVC melt and scorching and yellowing

[0004] The above problems are prominent in the existing conventional foaming agents, resulting in extremely unstable production quality of downstream product manufacturers, so they have to increase the amount of stabilizers and often shut down for debugging