One-component polyurethane powder adhesive synthesized by one-step method and preparation method thereof
A technology of polyurethane powder and adhesive, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of time-consuming and energy-consuming, cumbersome process, complicated preparation process, etc., and achieve a simple and easy-to-operate production process. , The effect of simple equipment requirements and simple preparation process
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[0024] The present invention provides a method of preparing a single component polyurethane powder adhesive synthesized, mainly comprising the step of: synthesizing polyurethane prepolymer, chauling. The R value of the polyurethane prepolymer is from 1.01 to 1.80, and the viscosity is 850 to 1200 MPa.s, which is a transparent viscous liquid.
[0025] The synthetic polyurethane prepolymer and the sealing granulation are completed, and the present invention is important. The blocking granulation is particularly a polar small molecular feaper dispersion of 1 to 2 times the volume of the polyurethane prepolymer to make it seal. Preferably, the polar small molecule-changing dispersion is a volume ratio of 2: 5 having a water dispersion, a volume ratio of 3:10 diethylamine and aqueous dispersion or aqueous dispersion.
[0026] In order to further illustrate the invention, the following examples of the one-component polyurethane powder adhesive and the preparation specific steps thereof ...
Embodiment 1
[0028] The preparation of a single component of the polyurethane powder adhesive is as follows:
[0029] (1) 75 g of polycaprate-1,4-butanediol (PBA, molecular weight 2000), is placed in a vacuum drying tank at 100 ° C, and the vacuum is 60 min, and the condition is removed after removing water, it will not affect The polymerization reaction was repeated; the reaction was reacted in the reaction vessel: 20 g of ilover diisocyanate was added to PBA ( IPDI 0.1 g catalyst dibutyltin, water bath temperature of 60 to 75 ° C, Rotate 400r / min, reactive 1.5 h; then add 4 g 1, 4-butanediol, reaction for 1 h, and adjusted viscosity to 850 to 1000 MPa during period. s;
[0030] (2) After dissolving 0.9 g of dihydroxymethylpropion, after the mass N-methylpyrrolidone, the reaction vessel of step (1) is added, stirred for 4 h, and the amount of moles such as hydrophilic agent is added. The triethylamine regulates the acidity to a pH of 7 to obtain a polyurethane prepolymer;
[0031] (3) Redu...
Embodiment 2
[0034] (1) 75 g of polyhexa-chloroethylic dietary dikanol (PDA, molecular weight 3000) was placed in a vacuum drying tank at 105 ° C, and the vacuum was 60 min; and the reaction was carried out in the reaction vessel, the conditions were: To the PDA, 20 gipdi, 0.2 g of catalyst dibutyltin, water bath temperature of 60 ~ 75 ° C, rotation speed 400r / min, in case reaction of 1.5 h; holding temperature and stirring, add 3 g1, 4-butanediol, reaction 1h The viscosity viscosity to 850 ~ 1000 MPa.s during the period during period;
[0035] (2) 1.8 g of hydrophilic dihydroxymethylpropionate is dissolved in mass N-methylpyrrolidone, adding the reaction vessel of step (1), stirring stirring for 4 h, adding moles of hydrophilic agents. Triethylamine regulates the acidity to a pH of 7 to obtain a polyurethane prepolymer;
[0036] (3) Reduce the reaction temperature of step (2) to 15 to 20 ° C, adjusting the stirring speed of 1000 r / min, adding the volume of diethylamine and water, diethyla...
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