Curing agent for modified urea-formaldehyde resin adhesives and preparation method thereof
A technology of urea-formaldehyde resin glue and curing agent, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems that cannot completely solve the problem of formaldehyde release, and achieve excellent bonding strength and emulsion stability Good performance and low monomer residual rate
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Embodiment 1
[0029] The preparation method of the curing agent provided by embodiment 1 has the following steps:
[0030] (1) At ambient temperature (0-40°C, the same below), add 300kg of deionized water, 10Kg of OP-10 and 4Kg of V-50 into the pre-emulsification tank with agitator, reflux condenser and thermometer composed of emulsifiers. Stir at a speed of 200rpm, mix well and then add 300kg of vinyl acetate monomer, 48kg of butyl acrylate, 60kg of crosslinking monomer N-methylol acrylamide, 22kg of functional monomer acrylic acid and 0.4kg of chain Transfer agent dodecyl mercaptan, continue to stir evenly to carry out pre-emulsification, obtain pre-emulsion liquid for use.
[0031] (2) Emulsification: first add 180kg of deionized water and 6.5kg of emulsifier (composed of OP-10 and V-50, the same ratio as the aforementioned emulsifier) into the reactor, and raise the temperature to 60°C. Add 120kg of pre-emulsion prepared in step (1), then stir and heat up to 70°C. Add 14kg of initi...
Embodiment 2
[0035] The preparation method of the curing agent provided by embodiment 2 has the following steps:
[0036] (1) Under ambient temperature, add the deionized water of 220kg, the cross-linking monomer acrylamide of 70kg and the functional monomer methacrylic acid of 12kg in the reaction kettle with agitator, stir until fully mixed, and obtain mono body solution .
[0037] (2) Soap-free seed emulsion: first add 350kg of deionized water and 70kg of monomer solution to the reactor , 6kg of vinyl acetate monomer, then stirred and heated to 72°C. Add the initiator solution of 20kg in reactor (the configuration of initiator solution is: the potassium persulfate of 1.8Kg is dissolved in the deionized water of 68Kg, stir well, standby), begin to heat up slowly at this moment, maintain reaction temperature to be controlled at 80 ℃, after about 20min, start to add the remaining 232Kg of monomer solution into the reactor at the same time , 214Kg vinyl acetate monomer and 42kg initia...
Embodiment 3
[0041] The preparation method of the curing agent provided by embodiment 3 has the following steps:
[0042] (1) At ambient temperature, add a mixed emulsifier composed of 280kg of deionized water, 9Kg of OP-10, 4Kg of SDBS and 1Kg of V-50 into the pre-emulsification tank with agitator, reflux condenser and thermometer . Stir at a speed of 180rpm, mix well and add 320kg of vinyl acetate monomer, 48kg of crosslinking monomer (this example uses silane coupling agent KH-550), and 30kg of functional monomer hydroxyethyl acrylate and 0.4kg of chain transfer agent (dodecyl mercaptan was used in this embodiment), and continued to stir evenly for pre-emulsification to obtain a pre-emulsion for use.
[0043] (2) Emulsification: first add 200kg of deionized water and 8kg of mixed emulsifier (in proportion) to the reactor, and raise the temperature to 62°C. Add 150kg of pre-emulsion prepared in step (1), then stir and heat up to 75°C. Add 12kg of initiator solution into the reaction k...
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