Compound formaldehyde stabilizer waterborne polyvinyl formal acetal and preparation method thereof

Abstract

The invention discloses a compound formaldehyde stabilizer waterborne polyvinyl formal acetal. The compound formaldehyde stabilizer waterborne polyvinyl formal acetal is characterized by being prepared from the following raw materials in parts by weight: 69-71 parts of polyvinyl acetate, 70-72 parts of methanol, 7.6-7.8 parts of sulfuric acid, 4-4.3 parts of formaldehyde, 30-32 parts of acetaldehyde, 0.76-0.78 part of sodium hydroxide, 0.75-0.78 part of potassium hydroxide, 3-4 parts of OP-10, 600-610 parts of water, 0.8-1.2 parts of carboxymethylcellulose and 0.3-0.5 part of an antioxidant 245. According to the compound formaldehyde stabilizer waterborne polyvinyl formal acetal disclosed by the invention, a conventional process is modified. By adopting a two-step method, hydrolyzed polyvinyl acetate is condensed with formaldehyde and acetaldehyde, so that the consumption of a solvent is reduced; by combining addition of the OP-10 and the antioxidant 245, an aqueous product which is uniform in dispersion of active ingredients and good in stability is prepared, and can be dissolved in water and high concentration formaldehyde in any proportion, so that the stabilizing efficiency of formaldehyde is improved and the operating steps are simplified.

Description

technical field [0001] The invention relates to a composite formaldehyde stabilizer water-based polyvinyl formal and a preparation method thereof. Background technique [0002] Polyvinyl formal ("PVFA") special resin is a kind of polyvinyl acetal resin, with regular molecular structure, concentrated viscosity-average molecular weight distribution, and the characteristics of both formal and acetal. It is used in the field of insulating coating and adhesive for bare copper wire. In addition, due to its unique chemical structure, the methanol solution of PVFA special resin can be used as a stabilizer for formaldehyde solution, which has the advantages of long storage time, fast dissolution speed, high solubility, and no foaming. The PVFA special resin produced by the traditional method is in the form of solid powder, which is only soluble in organic solvents such as methanol, and hardly soluble in water or formaldehyde solution. When used as a formaldehyde stabilizer, it can ...

AI Technical Summary

Problems solved by technology

When used as a formaldehyde stabilizer, it can only be fully dissolved in methanol first and then added to formaldehyde, which is cumbersome to operate

When used in a high-concentration formaldehyde solution, the traditional solid powder resin itself will continue to precipitate, affecting the use effect

Moreover, there are few domestic manufacturers of PVFA special resins, the production scale is small, and the process technology is applied to foreign patents. The production process technology has not been truly digested and absorbed, and there are potential safety hazards and environmental risks. Difficult to control and other issues