A kind of environment-friendly wood lacquer and preparation method thereof
An environmentally friendly technology for wood lacquers, applied in coatings, polyurea/polyurethane coatings, fire-resistant coatings, etc., can solve problems such as low crosslinking density, poor flame retardancy, and large steric hindrance
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Embodiment 1
[0042] The prepared film-forming resin comprising the steps of:
[0043] After the step S11, the polycarbonate diol into a state where the cooling water heated to a reflux condenser 60 ℃, was slowly added dropwise with stirring isophorone diisocyanate, after the completion of the dropwise addition the solution was heated to 80 ℃, incubated 2h, to give intermediate 1, after cooling to 70 ℃, the dimethylolpropionic acid was added thereto, incubated 4h, little heat to remove excess dimethylol propionic acid to afford intermediate 2;
[0044] After the step S12, the temperature was lowered to 50 ℃, intermediate 2 was added to the diol and the phosphorus-containing tin oxide, and adjusting the viscosity with acetone, the viscosity can be adjusted to smoothly stirred, incubated 2h, then added to the polyol crosslinking extender chain, warmed to 60 ℃, according to the method HG / T3409-92 detection time value of NCO, the NCO content was measured several times during the reaction, when th...
Embodiment 2
[0048] Phosphorus-containing diol was prepared:
[0049] Step S21, the drying of the flask was added under a nitrogen protected 1,4-diene-3-pentanol, benzene was added to dissolve, cooled to 0 deg.] C, the flask was sequentially added phosphorous oxychloride and triethylamine , 0 ℃ isothermal reaction 30min, after the post-treatment process comprises the reaction in an ice water bath, a solution of sodium bicarbonate was slowly added dropwise to the reaction system, benzene was added and then liquid separation was performed on a rotary evaporator and concentrated intermediate 3 is obtained;
[0050] Step S22, the Intermediate 3 was dissolved in methylene chloride, to which was then-chloroperbenzoic acid was stirred 12h, post treatment after the reaction, which comprises a post-treatment process, to the solution was added after the carbonation reaction sodium quenched and then liquid separation was washed with dichloromethane, concentrated on a rotary evaporator, purified and isola...
Embodiment 3
[0054] Preparation of a polyol-crosslinkable chain extender:
[0055] S31, at room temperature, and the dimethyl malonate citronellal was dissolved in dichloromethane, to which was added piperidine acetate, stirred for 24h, post treatment after the reaction, post-treatment process wherein the brine comprises water reaction mixture was washed several times, then there is the camera on a rotary evaporator and concentrated manner with column chromatography to afford intermediate 5;
[0056] S32, Intermediate 5 was dissolved in dichloromethane to obtain a solution A, was added to the flask iron chloride, aluminum chloride and methylene chloride, under anhydrous oxygen-free environment, cooled to -78 deg.] C, the solution A was slowly added to the flask, then warmed to room temperature naturally, post treatment after the reaction, post-treatment process which comprises adding a saturated ammonium chloride solution was added to the reaction mixture, the organic phase was washed, and the...
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