Low free MDI monomer bicomponent solvent-free
A two-component polyurethane, low-free technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of slow curing speed, high viscosity and poor leveling of adhesives. Superior performance, fast curing speed, and the effect of reducing production costs
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preparation example Construction
[0023] The preparation method of low-free MDI monomer solvent-free two-component polyurethane adhesive includes the preparation of A-component terminal OH polyol and the preparation of B-component terminal NCO polyurethane prepolymer, which is characterized in that: A component is composed of binary Alcohol and long carbon chain aliphatic dibasic acid and / or aromatic dibasic acid are obtained through esterification reaction, component B is made of MDI monomer, vegetable oil modified polyol and / or polyester polyol according to NCO / OH=3~5.5 :1 (molar ratio) reaction, the preparation of component B includes the following steps:
[0024] 1) Dehydrate vegetable oil-modified polyols and polyester polyols until the water content (mass percentage) of the polyol system is lower than 0.05%, add MDI monomer and molecular weight regulator, and heat up to 70-80°C to react to the reaction of hydroxyl groups in the system completely;
[0025] 2) Add a trimerization catalyst and continue to ...
Embodiment 1
[0042] Preparation of component A:
[0043] 1) Add 106.1g of diethylene glycol, 177.05g of neopentyl glycol, and 153.2g of 1,4-butanediol (4.4 moles of OH in total) into the reaction kettle, and heat to 80-100°C to make the diol completely melted;
[0044] 2) Add 43.2g of dimerized fatty acid, 263.0g of adipic acid, and 232.5g of terephthalic acid (3.1 moles of COOH in total), under the protection of weak nitrogen gas, and raise the temperature to 130-160°C for esterification reaction. When the water output of the system reaches After 60-80% of the theoretical effluent value of the esterification reaction, the temperature is raised to 200-220°C to continue the reaction;
[0045] 3) When the acid value drops below 15mgKOH / g, stop the nitrogen flow, evacuate to a vacuum degree of 0.266kPa, carry out esterification under reduced pressure until the acid value is less than 1.0mgKOH / g, cool down and discharge to obtain component A.
[0046]The obtained A component had a viscosity ...
Embodiment 2
[0053] Preparation of component A:
[0054] 1) Take 69.12g of dimer fatty acid, 319.6g of azelaic acid, 124.59g of isophthalic acid, (2.8 moles of COOH in total) 99.75g of diethylene glycol, 186.95g of neopentyl glycol, and 151.40g of 1,4-butanediol (containing 4.5 moles of OH in total) into the reaction kettle, under the protection of weak nitrogen gas, the temperature is raised to 130~160°C for esterification reaction, when the water output of the system reaches 70~80% of the theoretical water output value of the esterification reaction, the temperature is raised to 200~ Continue to react at 220°C;
[0055] 2) When the acid value drops below 15mgKOH / g, stop the nitrogen flow, evacuate to a vacuum degree of 0.266kPa, carry out esterification under reduced pressure until the acid value is less than 1.0mgKOH / g, cool down and discharge to obtain component A.
[0056] The obtained A component had a viscosity of 1050 mPa·s at 25° C. and a hydroxyl value of 164 mgKOH / g.
[0057] ...
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