Production method of polyvinyl alcohol sponge

Abstract

The invention discloses a polyvinyl alcohol sponge production method, and relates to the field of polyvinyl alcohol sponge production, polyvinyl acetal resin is dissolved in an alcohol aqueous solution to form polyvinyl acetal to-be-foamed rubber with the mass fraction of 5-25%; the preparation method comprises the following steps: preparing 0.01%-3% of a foaming substance with high foaming performance by using an alcohol aqueous solution, and foaming the foaming substance by using a foaming machine or a foaming machine, or directly stirring and foaming the foaming substance to obtain stable foam slurry; and adding the obtained foam slurry into a polyvinyl acetal resin adhesive to be foamed, uniformly stirring to obtain a foamed colloid, and shaping the foamed colloid by a cooling method to obtain the polyvinyl alcohol sponge. And cleaning and cutting the sponge to obtain a finished product. According to the invention, the polyvinyl acetal resin is directly foamed and then cooled for molding, only physical changes are involved in the foaming production link, chemical changes such as acetalization are avoided, a new thought is provided for industrialization upgrading of polyvinyl alcohol sponge, and the whole process is free of chemical changes, clean and environment-friendly.

Description

technical field [0001] The invention relates to the field of polyvinyl alcohol sponges, in particular to a method for producing polyvinyl alcohol sponges. Background technique [0002] Polyvinyl alcohol sponge refers to the foam formed by polyvinyl alcohol and at least one acetal of formaldehyde, acetaldehyde, glyoxylic acid, glyoxal, propionaldehyde, acrolein, butyraldehyde and glutaraldehyde body. [0003] The currently disclosed preparation method of the polyvinyl alcohol sponge includes: a pore-forming agent filling pore-forming method, a chemical foaming method, a mechanical stirring method, and a combination of the three. [0004] Pore-forming agent pore-forming foaming is to dissolve polyvinyl alcohol, add a pore-forming agent to the solution, and then add a catalyst, a cross-linking agent and various improvement or dispersing agents. After cross-linking and curing, the pore-forming agent is removed from the sponge. to obtain a porous polyvinyl alcohol sponge materi...

AI Technical Summary

Problems solved by technology

For example, PVA collodion head production enterprises, PVA imitation buckskin towel production enterprises, PVA face washing puff production enterprises, etc., all need to adopt batch production, which often leads to the following problems: the industry is scattered, it is difficult to scale production; water consumption is large, production Environmental protection pressure is high, a large amount of waste water containing acid, aldehyde and organic matter is discharged, and a large amount of acid gas and formaldehyde gas are discharged; the production environment is harsh, and the production workshop is almost in a state of water all year round, which cannot be produced in a standard industrial park; energy consumption is high, and a large amount of Steam is heated for dissolution and heating reaction; the product consistency is poor, and it is difficult to increase the production scale