Polyvinyl alcohol environmental protection adhesive is a new non-polluting, fast-drying water-based adhesive. It is used for the production of man made panels.
Compared with the same adhesive on the market at present, it does not contain formaldehyde and other toxic ingredients. It will not influence the production and using environment. The cost is low, the process is simple, the bonding effect is good and the speed of solidification is fast.
Formula One
Raw materials:
polyvinyl alcohol 0-8%, polyvinyl acetate or ethylene - vinyl acetate or mixture latex (N'XN 50Z) 1-40%. Appropriate modifier and thickening agent; water: 55% to 88%; cement or plaster and its retarder or activator: 3 % to 25%.
Preparation Methods: add 30g of polyvinyl alcohol to a heating pot containing 400g of water, stir and heat to 90 ~ 100℃. Keep stirring for about half an hour until polyvinyl alcohol is completely dissolved, then cool to below 80℃. Add 300g of polyvinyl acetate ethylene (content 50%), thickeners 20g, then add water to make the total quantity 900g. The above belongs to A group. Add B group when in use: 100g of white cement containing tricalcium silicate and dicalcium silicate or 100g of hemihydrate gypsum or its retarder, stir evenly, then sizing, realize pollution-free cold wood-based panel production .
Formula Two
Ingredients: PVA: 5% to 11%, appropriate amount of modifier, 65% to 88% of water; cement or plaster and its retarder or activator: 5 % to 25%
Preparation Methods: add 75g of polyvinyl alcohol to a heated pot containing 750g of water, stir and heat to 90 ~ 100℃, stir for half an hour at the same temperature until it is completely dissolved, then add proper amount of modifier Jun amount and then water to make a total of 880g. That is A group. B group will be 120g of white cement and activator or 100g of hemihydrate gypsum and its retarder, stir, then sizing, then produce pollution-free cold wood-based panel.
没有评论:
发表评论