A kind of self-crosslinking polyurethane dispersion and its preparation method and application
A polyurethane dispersion and self-crosslinking technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problem of low sealing efficiency of sodium bisulfite, easy crosslinking of shoe glue, and storage time Short and other problems, to achieve good storage stability, avoid quality decline, and enhance the effect of adhesive effect
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[0033] Another technical solution of the present invention is to provide a method of preparing the self-crosslinked polyurethane dispersion, comprising the steps of:
[0034] Step 1, will contain R 2 The structure of the bisroxy compound and 2,2-dihydroxymethropic acid were added to the reactor, and the weight ratio of 100 to 150 ° C, the weight ratio of moisture to moisture was less than 0.1%, and then cooled to 20 to 50 ° C, and containing R 1 The group of diisocyanate compounds, toned to 60 to 100 ° C, and the reaction was 50 ° C after 0.5 to 8 hours, and the prepolymer was obtained.
[0035] Step 2, adding acetone in the prepolymer obtained in step 1, the action of adding solvent acetone in the prepolymer is to reduce the functional viscosity, so that the crosslinking reaction can be carried out smoothly, slowly adding triphenylmethol dissolved in acetone. In the prepolymer, the dispersion is uniform, and the temperature is warmed to 50 to 65 ° C, and the reaction is 50 to 40 ...
Embodiment 1
[0050] A self-crosslinked polyurethane dispersion, the synthesis method is as follows:
[0051] 1, 7 mol of polyoxyethylene-12 (PEG-12) and 1 mol 2,2-dihydroxymepropionic acid were added to the reactor, warmed to 120 ° C, and removing moisture by vacuuming, the weight ratio of moisture is smaller than 0.1%; Cooling to 40 ° C, slowly addition of 8.7 mol of hexamethylene diisocyanate (HDI) and warmed to 70 ° C, and then cooled to 30 ° C after 4 hours to obtain a prepolymer product.
[0052] 2, 1000 ml of acetone was added to reduce the viscosity of the system; the 1.4 mol triphenylmethol was slowly added to the system, warmed to 55 ° C, and the reaction was lowered after 4 hours.
[0053] 3. After 1 mol of triethylamine is diluted with 5000 ml of water, the solution obtained from step 2 was slowly added. At a certain stirring rate, the acetone in the system was recovered by a decompression distillation, and the distillation temperature was not higher than 50 ° C. When the acetone co...
Embodiment 2
[0060] A self-crosslinked polyurethane dispersion, the synthesis method is as follows:
[0061] 1, 20 mol of polyoxypropylene-10 (PPG-10) and 1 mol 2,2-dihydroxymepropionic acid were added to the reactor, warmed to 120 ° C, and removing moisture by evacuation, and the weight ratio of moisture is less than 0.1%; Cooling to 40 ° C, slowly incorporating 22 mol ketone diisocyanate (IPDI) and warmed to 80 ° C, and then cooled to 30 ° C after 4 hours to obtain a prepolymer product.
[0062] 2, 5000 mL of acetone was added to reduce the viscosity of the system; 2 mol of triphenylmethol was slowly added to the system, warmed to 50 ° C, and the reaction was 10 hours to obtain an isocyanate polymer.
[0063] 3. After 1 mol of triethylamine is diluted with 16000 ml of water, the system is adjusted to be approximately 8 in the system. At a certain stirring rate, the acetone in the system was recovered by decompression distillation, and the distillation temperature was not higher than 55 ° C. ...
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