Quick-drying water-based adhesive as well as preparation method and application thereof
An adhesive, quick-drying technology, applied in the direction of adhesives, monocarboxylate copolymer adhesives, graft polymer adhesives, etc. Problems such as high viscosity and complex process operation
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preparation example Construction
[0136] In some examples, the preparation method of the above-mentioned waterborne polyurethane-polyvinyl acetate resin comprises the steps:
[0137] (1) preparing a diisocyanate-terminated prepolymer;
[0138] (2) Dissolving and diluting the diisocyanate-terminated prepolymer obtained in step (1) to obtain a diluted diisocyanate-terminated prepolymer;
[0139] (3) Dilute component B) and component C) with water respectively to obtain an aqueous solution of component B) and an aqueous solution of component C); the product obtained in step (2) is contacted with the aqueous solution of component B) to carry out chain extension Reaction; after the end of the chain extension reaction, add the aqueous solution of component C) to carry out the capping reaction, and then add component D) vinyl acetate once or in batches after the end of the capping reaction, and shear and disperse to obtain water-based polyurethane-vinyl acetate Ester mixed emulsion;
[0140] (4) The product obtaine...
preparation example
[0197] (1) Add 8g IPDI, 24g HDI, 230g PBA-2000, 8.5g MPEG1200, 100ppm (0.02705g) organic bismuth catalyst, 24g acetone, react at 80°C to generate a diisocyanate-terminated prepolymer;
[0198] (2) Sampling and monitoring the NCO of the system during the reaction, until the NCO reaches 1.72% of the theoretical value, cool down to about 60° C., add 383 g of acetone and stir for 5 minutes to obtain a diluted diisocyanate-terminated prepolymer;
[0199] (3) Mix 1.2g hydroxyethylethylenediamine, 1g ED-600 and 9.1g After diluting with 45g of deionized water, add to the reaction system at 45°C and stir for chain extension reaction for 20 minutes; dilute 0.36g of diethanolamine and 0.06g of cysteamine with 2g of deionized water, add to the reaction system and perform capping React for 5 minutes; add 135g of vinyl acetate and stir for 2-3 minutes, add 353g of water under the condition of shear dispersion, and obtain water-based polyurethane-vinyl acetate mixed emulsion after shear...
Embodiment 1
[0209] A quick-drying water-based adhesive used in the shoemaking field is prepared by reacting components comprising the following parts by weight:
[0210] Waterborne polyurethane-polyvinyl acetate resin I 100 parts,
[0211] BYK-024 (defoamer) 0.05 parts,
[0212] 0.2 parts of TEGO-KL245 (wetting agent),
[0213] (thickener) 0.2 parts;
[0214] The quick-drying water-based adhesive of this example is prepared by the following steps: add water-based polyurethane-polyvinyl acetate resin I (100g), defoamer BYK-024 (0.05g), and wetting agent TEGO-KL245 (0.2g) into In the stirred tank, the stirring speed is 300 rpm, and the stirring time is 12 minutes; then add the thickener to the stirred tank (0.2g), stirring speed is 500 rev / mins, and stirring time is 30 minutes, is adjusted to viscosity and is 3000cps, discharging.
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