A kind of nonionic and anionic mixed modified waterborne polyurethane curing agent and preparation method thereof
An anionic modifier and water-based polyurethane technology, which is applied in the field of water-based polyurethane curing agent and its preparation, can solve the problems such as the decrease of the effective-NCO percentage content of the curing agent, the decrease of water resistance, and the long drying time of the coating film, and reach the NCO content High, good resistance to yellowing, and the effect of improving hydrophilicity
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Embodiment 1
[0032] A preparation method of nonionic and anionic mixed modified water-based polyurethane curing agent, comprising the following steps:
[0033] (1) In a tank equipped with a stirrer, a thermometer and a 2 In a protected, dry and clean 500mL four-neck flask, add 300 g of HDI monomer, and add 12 g of polyethylene glycol with a molecular weight of 400 at a stirring speed of 100 r / min, heat to 60°C and keep it warm for 2 hours to obtain Adducts of HDI and oligomer polyols.
[0034] (2) Add 0.61g of 2-hydroxyethyltrimethylammonium chloride to the adduct obtained in step (1), keep the temperature at 70°C during the reaction, measure the NCO content in the reaction system every hour, when the NCO content reaches 36.8% At 160°C and 0.01 Torr, the unreacted HDI monomer was removed by thin film evaporation technology to obtain a HDI prepolymer with low free monomer content.
[0035] (3) When the temperature of the HDI prepolymer obtained in step (2) drops to 60°C, add 24.96g of DMP...
Embodiment 2
[0039] A preparation method of nonionic and anionic mixed modified water-based polyurethane curing agent, comprising the following steps:
[0040] (1) In a tank equipped with a stirrer, a thermometer and a 2 In a protected dry and clean 500mL four-neck flask, add 300 g of HDI monomer, and add 24 g of polyethylene glycol with a molecular weight of 400 at a stirring speed of 100 r / min, heat to 80°C and keep it warm for 2 hours to react The adducts of HDI and oligomer polyols are obtained.
[0041] (2) Add 0.88g of tetrabutylammonium bromide to the adduct obtained in step (1), keep it warm at 60°C, measure the NCO content in the reaction system every hour, and when the NCO content reaches 34.6%, at 170 Under the conditions of ℃ and 0.02 Torr, the unreacted HDI monomer is removed by thin film evaporation technology, and the HDI prepolymer with low free monomer content is obtained.
[0042] (3) When the temperature of the HDI prepolymer obtained in step (2) drops to 70°C, add 13....
Embodiment 3
[0046] A preparation method of nonionic and anionic mixed modified water-based polyurethane curing agent, comprising the following steps:
[0047] (1) In a tank equipped with a stirrer, a thermometer and a 2 Add 300g of HDI monomer to a protected, dry and clean 500mL four-necked flask, and add 21g of polyethylene glycol with a molecular weight of 500 at a stirring speed of 100 r / min, heat to 70°C and keep it warm for 3 hours to obtain HDI Adducts with oligomer polyols.
[0048] (2) Add 0.9g of benzyltriethylammonium chloride to the adduct obtained in step (1), keep it warm at 70°C, measure the NCO content in the reaction system every hour, and when the NCO content reaches 35.9%, the Under the conditions of 150°C and 0.03 Torr, the unreacted HDI monomer is removed by thin film evaporation technology to obtain a HDI prepolymer with low free monomer content.
[0049] (3) When the temperature of the HDI prepolymer obtained in step (2) drops to 60°C, add 22.47g of DMPA, keep it w...
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