Polyvinyl formal sponge material with uniform abscesses and rapid imbibition and preparation method thereof
A polyvinyl formal and polyvinyl alcohol technology, which is applied in the field of polyvinyl formal sponge and its preparation, can solve the problems of yellowing, low product yield, mildew and the like, and achieves improved water retention rate and stable production process , the effect of increasing the water absorption rate
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Embodiment 1
[0027]Stir 2 parts of polyvinyl alcohol in 20 parts of water at a temperature of 90°C to form a solution, add 2 parts of pore-forming agent and 0.01 part of emulsifier to the solution during the stirring process, and fully emulsify the pore-forming agent to form a dispersion After the uniform continuous liquid phase, add 3 parts of formaldehyde solution, and then add 2 parts of 50% sulfuric acid solution, mix well and pour it into the mold, react at 75°C for 1 hour, the continuous liquid phase system will transform and form bubbles After the hole is heated to 90°C for 4 hours of curing, the cured product is cooled and removed from the mold, the waste liquid is recycled, and the product is rolled and washed; after cleaning, the product is cut and cut under different environmental conditions according to the application requirements. Sterilize and pack.
Embodiment 2
[0029] Stir 5 parts of polyvinyl alcohol in 80 parts of water at a temperature of 90°C to form a solution, add 0.2 parts of pore-forming agent and 0.01 part of emulsifier to the solution during stirring, and fully emulsify the pore-forming agent to form a dispersion After the uniform continuous liquid phase, add 5 parts of formaldehyde solution, then add 10 parts of 50% sulfuric acid solution or 10 parts of recovered waste liquid, and 4 parts of cross-linking agent for mixing, and pour it into the mold for cross-linking after 10 minutes After reacting for 0.5 hours, after the continuous liquid phase system transforms to form cells, heat and mature at 70°C for 8 hours, cool the matured product and pour it out of the mold, recover the waste liquid, and perform preliminary cleaning and deep cleaning on the product Cutting is made into polyvinyl formal sponge material again, and is made into polyvinyl formal sponge material.
Embodiment 3
[0031] First, fully stir and disperse 7 parts of polyvinyl alcohol in 100 parts of water at a temperature of 95°C; add 4 parts of pore-forming agent to fully disperse and dissolve together under stirring conditions, or add 4 parts of pore-forming agent to stir and disperse after cooling down; add in sequence 9 parts of cross-linking agent, 15 parts of catalyst, or sequentially add 15 parts of catalyst, 9 parts of cross-linking agent, or sequentially add 20 parts of recovered waste liquid, 10 parts of catalyst, 10 parts of cross-linking agent, or sequentially add Add 20 parts of recovered waste liquid, 9 parts of cross-linking agent, and 10 parts of catalyst, stir for 15 minutes and pour into the mold. After 1 hour of cross-linking reaction in the mold, the continuous liquid phase system changes to form bubbles. After the hole, continue to heat and cross-link at 76°C for 12 hours; remove the cured product from the mold and recycle the waste liquid generated; clean the product; c...
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