Water-based closed polyisocyanate curing agent as well as preparation method and application thereof
A technology of polyisocyanate and diisocyanate, which is applied in the field of water-based closed polyisocyanate curing agent and its preparation, can solve the problems of increasing the storage difficulty of water-based isocyanate curing agent, achieve excellent water dispersibility and storage stability, reduce dosage, The effect of high transparency
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Embodiment 1
[0041] A preparation method of a water-based closed polyisocyanate curing agent, comprising the following steps:
[0042]Prepare raw materials according to the recipe shown in Table 1. Put 97.1 parts by mass of hexamethylene diisocyanate trimer into a four-necked flask equipped with a stirrer, a thermometer and a nitrogen inlet, raise the temperature to 60°C, and add 2.8 parts by mass of 2-tert-butyl-4-( Cyclohexylamino)-1-butanesulfonate sodium, 0.2 parts by mass of nitrogen nitrogen dimethylbenzylamine, after reacting at 80°C for 6 hours, take a sample to detect the isocyanate content (the determination of the isocyanate content uses HGT 2409 -Toluene-di-n-butylamine titration method in 1992), add sodium bisulfite when approaching the theoretical value (difference from the theoretical value of 0.05% mass content is not more than 0.5%), react at 55 ° C for 5 hours, and then take a sample The content of isocyanate is detected, and the reaction is terminated when the mass cont...
Embodiment 2
[0046] A preparation method of a water-based closed polyisocyanate curing agent, comprising the following steps:
[0047] Prepare raw materials according to the formula shown in Table 2. Put 96.9 parts by mass of hexamethylene diisocyanate trimer into a four-necked flask equipped with a stirrer, a thermometer and a nitrogen inlet, raise the temperature to 60°C, and add 3.0 parts by mass of 2-tert-butyl-4- (Cyclohexylamino)-1-sodium butanesulfonate, 0.35 parts by mass of nitrogen nitrogen dimethyl benzylamine, after reacting at 90°C for 4.5 hours, take a sample to detect the isocyanate content (the determination of the isocyanate content uses HGT 2409 -Toluene-di-n-butylamine titration method in 1992), sodium bisulfite was added when approaching the theoretical value (not more than 0.5% difference from the theoretical value mass content of 0.05%), then reacted at 55°C for 5 hours, and waited When the mass content of isocyanate group is less than 0.05%, the reaction is terminat...
Embodiment 3
[0051] A preparation method of a water-based closed polyisocyanate curing agent, comprising the following steps:
[0052] Prepare raw materials according to the formula shown in Table 3. Put 97.1 parts by mass of hexamethylene diisocyanate trimer into a four-necked flask equipped with a stirrer, a thermometer and a nitrogen inlet, raise the temperature to 60°C, and add 2.8 parts by mass of 2-tert-butyl-4- (Cyclohexylamino)-1-sodium butanesulfonate, 0.5 parts by mass of nitrogen dimethylbenzylamine; after reacting at 80°C for 5.5 hours, take a sample to detect the isocyanate content (the determination of the isocyanate content uses HGT 2409 -Toluene-di-n-butylamine titration method in 1992), add sodium bisulfite when approaching the theoretical value (difference from the theoretical value of 0.05% mass content is no more than 0.5%); then react at 55°C for 5 hours, wait for When the mass content of isocyanate group is less than 0.05%, the reaction is terminated to obtain a wate...
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