Preparation method of sulfonic acid type waterborne polyurethane adhesive
A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the complex structure of sodium lignosulfonate, poor compatibility with water-based polyurethane, and large steric hindrance and other problems, to achieve the effect of improving the bonding performance and hydrolysis resistance, increasing the bonding strength and reducing the content
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Embodiment 1
[0027] In the first step, 20 g sodium lignosulfonate, 12.24 g diethylenetriamine, 4.8 g formaldehyde solution (36 wt%) were dissolved in 100 g deionized water, and NaOH solution (10 wt%) was added to adjust the pH to 10 -12, reacted at 70 °C for 5 h; then the mixture was cooled to room temperature, and then slowly poured into a large amount of absolute ethanol to precipitate the product, which was centrifuged and washed 3 times with absolute ethanol, then vacuum-dried at 50 °C 24 h to obtain sodium amine lignosulfonate;
[0028] In the second step, 87 g of polybutylene adipate diol was dehydrated at 110 °C and then added to the reactor, and then 4.4 g of isophorone diisocyanate, 6.7 g of hexamethylene diisocyanate, 0.03 g of g 1,4-butanediol and 0.02 g dibutyltin dilaurate were added to the reactor and reacted at 80 °C for 3 h, so that the residual NCO groups accounted for less than 1.34 wt% of the prepolymer; then 60 g acetone to reduce viscosity, then 0.375 g of sodium amin...
Embodiment 2
[0041] The first step is to prepare sodium amine lignosulfonate by step one in Example 1;
[0042] In the second step, 87 g of polycarbonate polyol was dehydrated at 110 °C and added to the reactor, and then 4.4 g of isophorone diisocyanate, 6.7 g of hexamethylene diisocyanate, 0.03 g of 1,4- Butanediol and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80 °C for 3 h, so that the residual NCO group accounted for less than 1.34 wt% of the prepolymer; then 60 g of acetone was added to reduce the viscosity, Then 0.75 g of sodium amine lignosulfonate, 1.0 g of sodium ethylenediamine ethanesulfonate, and 0.36 g of diethanolamine were dissolved in 5 g of deionized water, and added to the reactor for chain extension reaction. The reaction is carried out for 0.5 h to obtain a polyurethane prepolymer;
[0043] In the third step, 110 g of deionized water was added to 165 g of polyurethane prepolymer, and dispersed at high speed for 0.5 h at 25 °C, and then the ...
Embodiment 3
[0046] The first step is to prepare sodium amine lignosulfonate by step one in Example 1;
[0047] In the second step, 87 g of polybutylene adipate diol was dehydrated at 110 °C and then added to the reactor, and then 4.4 g of isophorone diisocyanate, 6.7 g of hexamethylene diisocyanate, 0.03 g of g 1,4-butanediol and 0.02 g dibutyltin dilaurate were added to the reactor and reacted at 80 °C for 3 h, so that the residual NCO groups accounted for less than 1.34 wt% of the prepolymer; then 60 g acetone to reduce viscosity, then 1.13 g of sodium amine lignosulfonate, 1.1 g of sodium ethylenediamine ethanesulfonate, and 0.18 g of diethanolamine were dissolved in 5 g of deionized water, and added to the reactor for chain extension reaction , and reacted at 50 °C for 0.5 h to obtain a polyurethane prepolymer;
[0048] In the third step, 110 g of deionized water was added to 165 g of polyurethane prepolymer, and dispersed at high speed for 0.5 h at 25 °C, and then the acetone was re...
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