Thermally activated polyurethane hot melt adhesive and preparation method thereof
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A technology of polyurethane hot melt adhesive and heat activation, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., and can solve the problem of short storage period of hot melt adhesive
Active Publication Date: 2021-09-07
ZHEJIANG HUAFON SYNTHETIC RESIN
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By modifying the NCO at the end of ordinary moisture-curing polyurethane hot-melt adhesives, the hot-melt adhesives are prevented from being sensitive to
Method used
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preparation example Construction
[0027] The preparation of polyurethane involves:
[0028] Step 1. In the presence of a protective gas, put the polymer polyol, optional chain extender, catalyst, and auxiliary agent into the reaction vessel, heat up to 110-135° C. and vacuumize and dehydrate for 1-3 hours;
[0029] Step 2, cooling the mixture obtained in step 1 to 55-70°C, adding polyisocyanate, raising the temperature to 90-100°C and continuing the reaction for 1-2 hours to obtain polyurethane with an NCO mass content of 2-5%;
[0030] Among them, the test of NCO mass content is to use the -NCO group contained in the polyurethane obtained by the reaction to react with excess di-n-butylamine to produce urea, and then titrate the excess di-n-butylamine with hydrochloric acid to quantitatively calculate the mass content of NCO.
[0031] The protective gas is a gas with stable chemical properties and does not participate in the reaction process or reaction. Preferably, the protective gas is nitrogen;
[0032] Pr...
Embodiment 1
[0072] Preparation method of heat-activated polyurethane hot-melt adhesive: In the presence of nitrogen, control the temperature of polyurethane (a1) to 90°C to make it in a molten state, add an active hydrogen-containing oxazine small molecule compound and a catalyst, stir and react for 1 hour, pack saved;
[0073] Wherein, the molar ratio of the active hydrogen to the NCO of the polyurethane in the oxazine small molecular compound containing active hydrogen is 1:1.
Embodiment 2
[0075] Preparation method of heat-activated polyurethane hot-melt adhesive: In the presence of nitrogen, control the temperature of polyurethane (a2) to 110°C to make it in a molten state, then add an active hydrogen-containing oxazine small molecule compound and a catalyst to stir and react for 0.8h, The packaging is preserved;
[0076] Wherein, the molar ratio of the active hydrogen to the NCO of polyurethane in the oxazine small molecular compound containing active hydrogen is 1:0.8.
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Abstract
The invention relates to a thermally activated polyurethane hot melt adhesive and a preparation method thereof, wherein the thermally activated polyurethane hot melt adhesive is obtained by reacting polyurethane with the NCO mass content of 2-5% and an oxazine small molecule compound containing reactive hydrogen, and the molar ratio of the reactive hydrogen in the oxazine small molecule compound containing reactive hydrogen to the NCO of the polyurethane is 1:1-1:0.5. The preparation method comprises the steps: in the presence of protective gas, mixing and reacting the oxazine small molecule compound containing reactive hydrogen and the molten polyurethane to obtain the thermally activated polyurethane hot melt adhesive. The invention provides the thermally activated polyurethane hot melt adhesive and the preparation method thereof. NCO at the tail end of a common moisture-curing polyurethane hot melt adhesive is modified, so that the hot melt adhesive is prevented from being sensitive to water vapor, the problem that the moisture-curing polyurethane hot melt adhesive is short in storage period is solved, no sealing agent needs to be added, and the phenylproxazine small-molecule compound plays a role of a conventional sealing agent.
Description
technical field [0001] The invention belongs to the technical field of polyurethane adhesives, and in particular relates to a heat-activated polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] As an important solvent-free adhesive, polyurethane hot melt adhesive has very broad application prospects due to its simple operation, excellent performance, and environmental friendliness. According to different reaction mechanisms, polyurethane hot melt adhesives are mainly divided into thermoplastic polyurethane hot melt adhesives and reactive polyurethane hot melt adhesives. Among them, compared with conventional thermoplastic polyurethane hot melt adhesives, reactive polyurethane hot melt adhesives have better Bond strength, solvent resistance, and aging resistance make it widely used in industrial and civil fields such as construction, civil engineering, automobiles, ships, electronics, and footwear. [0003] The reactive polyurethane ...
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