Modified waterborne epoxy resin curing agent and preparation method thereof
A technology of water-based epoxy resin and curing agent, applied in the direction of epoxy resin coating, coating, etc., can solve the problem of high viscosity, achieve the effect of mild reaction, good dispersion and emulsification performance, and convenient operation
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[0068] The present invention also provides a preparation method of the above-mentioned curing agent for modified water-based epoxy resin, comprising the following steps:
[0069] Step 1: reacting diisocyanate with polyethylene glycol monomethyl ether to obtain a reaction product I containing a urethane intermediate product A containing an isocyanate group at one end and a methoxy group at one end;
[0070] Step 2: The reaction product I obtained in step 1 contains enough isocyanate groups to react with aliphatic polyamines to obtain a reaction product II containing a urea intermediate product B containing a methoxy group at one end and a primary amine group at one end;
[0071] Step 3: The amount of primary amine groups contained in the reaction product II obtained in step 2 is sufficient to react with the monofunctional epoxy reactive diluent to obtain the curing agent for the modified waterborne epoxy resin containing the alkanolamine product.
[0072] The preparation of the...
Example Embodiment
[0094] Example 1
[0095] Step 1: Add 10g of isophorone diisocyanate (IPDI) into a 500mL four-necked flask with a thermometer and a condenser, raise the temperature to 30°C under nitrogen protection, and start the stirrer; A total of 33.78 g of polyethylene glycol monomethyl ether MPEG750, except water, was reacted for 1 hour; the reaction product I containing the urethane intermediate product A containing an isocyanate group at one end and a methoxy group at one end was obtained;
[0096] Step 2: add 8.51 g of tetraethylene pentamine to the flask, slowly add the reaction product I obtained in step 1 dropwise into the flask, slowly increase the temperature to 50 ° C after the dropwise addition and continue the reaction for 2 h, to obtain a reaction product containing one end containing Methoxy group, reaction product II of urea intermediate product B containing a primary amino group at one end;
[0097] Step 3: Add monofunctional reactive diluent: 34.62g C12-14 alkyl glycidyl...
Example Embodiment
[0101] Example 2
[0102] Step 1: Add 10g of isophorone diisocyanate (IPDI) into a 500mL four-necked flask with a thermometer and a condenser, raise the temperature to 40°C under nitrogen protection, and start the stirrer; A total of 54 g of polyethylene glycol monomethyl ether MPEG1200, except water, was reacted for 1 hour; the reaction product I containing the urethane intermediate product A containing an isocyanate group at one end and a methoxy group at one end was obtained;
[0103] Step 2: Add 8.51 g of tetraethylene pentamine to the flask, slowly add the reaction product I obtained in step 1 dropwise into the flask, slowly increase the temperature to 70 ° C after the dropwise addition and continue the reaction for 2 h, to obtain a mixture containing one end containing Methoxy group, reaction product II of urea intermediate product B containing a primary amino group at one end;
[0104] Step 3: Add monofunctional reactive diluent: 34.62g C12-14 alkyl glycidyl ether to t...
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