A kind of water-soluble closed type polyurethane curing agent and its preparation method and application
A polyurethane curing agent, a closed-type technology, applied in the direction of polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve the problems of the reduction of the effective functional group ratio of the curing agent, the low solid content, and the large molecular weight of the product. Achieve excellent surface quality, high surface quality, good hydrophilicity
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Embodiment 1
[0065] Step 1: preparing a partial block of isocyanate;
[0066] In the prepolymerization kettle, add 100g IPDI and 50g acetone, add 35g methyl ethyl ketone oxime dropwise at room temperature, drop it in 1.5 hours, the temperature does not exceed 52 ° C, and obtain a partial closure of IPDI (component A).
[0067] Step 2: preparing partially blocked polyisocyanate prepolymers containing hydrophilic carboxyl groups;
[0068] Adopt process 1, the specific process is: in the reactor, add 250g acetone and 66.7g dimethylol butanoic acid, heat to 50 ℃ and dissolve completely, dropwise add 0.3g dibutyltin dilaurate catalyst (due to IPDI, HDI The reactivity of the trimer is low), and the component A is added dropwise, and the dropwise addition is completed in about 1 hour, during which the temperature is kept at 50±2°C. After the dropwise addition, keep it at 50°C for 1 hour, rise to below 60°C for 10 hours, then add 246.5g of HDI trimer (NCO% is 23.0%), add 0.3g of dibutyltin dilaur...
Embodiment 2
[0072] Step 1: preparing a partial block of isocyanate;
[0073] Add 100g of IPDI and 40g of acetone to prepolymerization kettle 1, raise the temperature to 50°C and add 35g of methyl ethyl ketone oxime dropwise for 1 hour, and the dropping temperature is 50-52°C to obtain component A.
[0074] In prepolymerization kettle two, add 328g HDI trimer (NCO% is 23.0%) and 50g acetone, add 51g methyl ethyl ketoxime dropwise at normal temperature, dropwise finish in 1 hour, dropwise temperature does not exceed 50 ℃, obtains component B.
[0075] Step 2: preparing partially blocked polyisocyanate prepolymers containing hydrophilic carboxyl groups;
[0076] Adopt process 1, the specific process is: in the reactor, add 250g acetone and 67g dimethylol propionic acid, heat to 50 ℃ and completely dissolve, dropwise add 0.3g stannous octoate catalyst, stir evenly, first add component A, The addition was completed in about 1 hour, during which the temperature was kept at 50±2°C, and reacted ...
Embodiment 3
[0080] Step 1: preparing a partial block of isocyanate;
[0081] In the reactor, add the prepolymer of 582gTDI and trimethylolpropane (solid content is 75%, NCO% is 13.0%), 100gMDI, 200g acetone, 80g propylene glycol methyl ether acetate, after mixing evenly, add under normal temperature 91 g of methyl ethyl ketoxime was added over 1.5 hours at a temperature not exceeding 50° C. to obtain a partially blocked isocyanate (component C).
[0082] Step 2: preparing partially blocked polyisocyanate prepolymers containing hydrophilic carboxyl groups;
[0083] Adopt process 2, the specific process is: raise the temperature in the reactor to 50°C, add 67g of dimethylolpropionic acid in 5 times, add it within 1 hour, keep it at 50±2°C for 1 hour after the addition, and then Raise the temperature to 60±2°C and react for 6 hours.
[0084] Step 3: preparing a water-soluble closed polyurethane curing agent;
[0085] Lower the temperature of the material in the reactor to 50°C, slowly add...
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