Coating formula: waterborne polyurethane coating formula

Core tip: waterborne polyurethane coating is one of the products with large market demand at present It is suitable for the middle coating and surface coating of high and medium grade wood (furniture, etc.) with heat sensitive temperature lower than (60-80) ℃ and normal temperature crosslinking curing, high-grade building decoration, high-grade automobile, aircraft and aerospace equipment, etc Product formula: 1 The product of modified trimer crosslinker can be made of isocyanate such as TDI, IPDI, MD I and XDI The reaction temperature of its aromatic NCO is (1 Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Home of coatings: waterborne polyurethane coating is one of the products with large market demand at present It is suitable for high and medium grade wood (furniture, etc.) with heat sensitive temperature lower than (60-80) ℃ and crosslinking curing at room temperature It is also suitable for medium and surface coating of high-grade building decoration, high-grade automobile, aircraft and aerospace equipment Product formula: 1 The modified trimer crosslinker can be manufactured by TDI, IPDI, MDI, XDI and other isocyanates The reaction temperature of aromatic NCO is (120-150) ℃, and that of aliphatic NCO is (150-200) ℃ Its biggest advantage is no yellowing, water white and transparent, which is suitable for the normal temperature crosslinking agent of waterborne polyurethane such as carboxylic acid In order to enhance the comprehensive properties, two diisocyanates with different NCO group activities should be used, and the NCO terminated in the reaction should be reacted with polyol carboxylic acid to facilitate amine neutralization and water solubility of the product Because of its high melting point, the reaction needs to be carried out in organic solvent in stages The isocyanate can self polycondensate to form trimer compound with organic phosphine catalyst and temperature above 120 ℃ The reaction temperature is low and the yield is up to 90% The tripolymerization method is used to promote the complete reaction and seal the residue Product formula: NCO: polyol carboxylic acid (mass ratio) is 6:1:1.43 Process steps: prepare polyol carboxylic acid solution, add neopentyl glycol, trimellitic anhydride, DMPA, xylene and toluene into the reactor and stir according to the formula, raise the temperature to 80 ℃, complete the dissolution, raise the temperature to 148 ℃ and return the water to be transparent, filter the material for standby Preparation of imine prepolymer: add xylene and toluene into the reactor according to the formula, raise the temperature to 148 ℃ for refluxing dehydration, add 10% phosphoric acid (toluene) solution to reduce the temperature to 120 ℃, introduce nitrogen, add TDI and IPDI into the monomer dropping reactor, complete the dropping within 2.5h, raise the temperature to 130 ℃ for 1h, add 10% pentaheterocyclic phosphine liquid into the dropping reactor, start to drop slowly, and continuously observe the reaction of materials to prevent explosive polymerization, At the end of dripping, react at 130 ℃ for 2h, 140 ℃ for 1h, 145 ℃ for 30min, cool down to 70 ℃, add the polyol carboxylic acid solution into the dropping kettle and start dripping After dripping, react at 70 ℃ for (2-3) h, and detect that the conversion of NCO is 96%, and add 10% lithium acetate solution At this time, there are two processes: one is to cool down to 25 ℃, stand for 7d, the other is to heat up to (80-90) ℃ for (2-3) h, and detect that the free TDI is below 0.3%, Add 10% methyl p-toluenesulfonate solution and 10% dimethylpyrazole solution to warm up to 85 ℃ for 20min, vacuum out 2 / 3 of the organic solvent, add hydrophilic solvent to adjust the solid content to 50%, add 50% triethylamine aqueous solution and n-toluenediol amine to cool down to 50 ℃ to adjust the pH value to 8.5, heat up to 60 ℃ to react to transparent, cool down to 40 ℃ to discharge 2 The product formula of modified HDI biuret crosslinker: NCO: H2O = 3:1.1, NCO: Oh = 6:1, theoretical NCO content = 15.9% The method of staged polymerization and neutralization is adopted Process steps: prepare polyol carboxylic acid solution, add neopentyl glycol, trimellitic anhydride, DMPA, xylene and toluene into the reactor according to the formula, raise the temperature to 80 ℃ for uniform dissolution, then raise the temperature to 148 ℃ for refluxing dehydration to transparent anhydrous, and lower the temperature to 40 ℃ for discharging for standby Preparation of HDI prepolymer: add hexadiisocyanate and xylene into the reactor according to the formula, put nitrogen into the reactor, raise the temperature to 65 ℃, add 10% phosphoric acid (toluene) solution and mix well, add deionized water into the dropping reactor to start the dropping, the reaction is self exothermic, control the self heating to be below 80 ℃, after the dropping, raise the temperature to 90 ℃ for 1h, 120 ℃ for 2h, 130 ℃ for 1h, and lower the temperature to 70 ℃, Then the polyol carboxylic acid solution is put into the dropping reactor to start dropping After dropping, it reacts at 70 ℃ (2-3) h, 80 ℃ 1H, and the free HDI is measured to be less than 0.2% The organic solvent is removed by vacuumizing, the hydrophilic solvent is added, the solid content is adjusted to 50%, the 50% triethylamine aqueous solution is added when the temperature is reduced to 50 ℃, the pH value is adjusted to 8.4, the reaction is heated to 60 ℃ to be transparent, and the material is filtered when the temperature is reduced to 40 ℃ 3 The product formula of modified TDI Trimer crosslinker: NCO: Oh (mass ratio of substance) is 6:1, and trimerization catalysis reaction, termination reaction, residue sealing method and staged reaction are adopted Process steps: prepare polyol carboxylic acid solution, add trimethylolpropane, neopentyl glycol, trimellitic anhydride, dm-pa, butyl acetate and xylene into the reactor and stir according to the formula, raise the temperature to 80 ℃ for uniform dissolution, then raise the temperature to 148 ℃ for reflux dehydration to transparent, lower the temperature to 40 ℃ for filtering and discharging for standby Preparation of trimerization system: add xylene and toluene into the reactor for stirring according to the formula, raise the temperature to 148 ℃ after reflux dehydration, lower the temperature to 120 ℃, add 10% lithium phosphate solution for stirring, pass nitrogen, add TDI into the monomer dropping reactor to start adding, after 3H dropping adding, conduct reaction at 120 ℃ for 2h, 130 ℃ for 1h, lower the temperature to 65 ℃, enter the polyol carboxylic acid solution into the dropping reactor to start adding, the reaction is self exothermic, and the temperature is controlled below 75 ℃, After dripping, keep the temperature at 80 ℃ for 2 h, sample and measure the free TDI ＜ 0.9%, add 10% toluene phosphate solution to raise the temperature to 85 ℃ for 2 h (or drop to 25 ℃ for 7 days), measure the free TDI ＜ 0.2%, add 10% dimethyl sulfate solution and 10% dimethylpyrazole solution to raise the temperature to 90 ℃ for 15 min, vacuum out the organic solvent, add the hydrophilic solvent to adjust the solid content to 50%, Add 50% triethylamine aqueous solution and n-toluenediol amine to adjust the pH value to 8.4 when the temperature is reduced to 50 ℃, react to transparency when the temperature is increased to 60 ℃, and discharge when the temperature is reduced to 40 ℃ 4 The formulation of TDI / tmp additive and modifier crosslinker: NCO: Oh (mass ratio of substance) is 3:1, and the method of trimerization catalysis, termination reaction and residue sealing is adopted Process steps: prepare the polyol carboxylic acid solution, add TMP, neopentyl glycol, trimellitic anhydride, DMPA and butyl acetate into the reactor according to the formula, stir and heat up to 80 ℃ for uniform dissolution, heat up to 140 ℃ for reflux dehydration to transparent, cool down to 40 ℃, filter and discharge for standby Preparation of adduct: according to the formula, butyl acetate and toluene are mixed in the reactor, heated to 140 ℃ for refluxing dehydration, cooled to 60 ℃ and added with TDI, introduced with nitrogen, added with polyol carboxylic acid solution in the dropping reactor, the reaction is self exothermic, the dropping is slow, the temperature is controlled at 70 ℃ and dropped completely, added with 10% toluene phosphate solution, and reacted at 70 ℃ for (4-5) H The content of NCO was 13.1%, the free TDI was 12.5%, 10% tributylphosphine solution was added to mix, the temperature was raised to 85 ℃ for reaction (2-3) H (or cooled to 25 ℃ for 7 days), the free TDI was less than 0.2%, 10% benzoyl chloride solution and 10% dimethylpyrazole solution were added to raise the temperature to 90 ℃, the reaction was carried out for 15 minutes, the organic solvent was removed, the hydrophilic solvent was added, and the solid content was adjusted to 50%, Add 50% triethylamine aqueous solution and n-toluenediol amine to adjust the pH value to 8.5 when the temperature is reduced to 50 ℃, react to transparency when the temperature is increased to 60 ℃, and filter the discharge when the temperature is reduced to 40 ℃ 5 XDI / tmp addition modifier, NCO crosslinking agent product formula: NCO: Oh (mass ratio of substances = 9:1), trimerization catalysis, termination, residue sealing method Process step: refer to the fourth process step 6 Modified TDI alcoholysis oil, NCO cross-linking agent product formula: oil degree 86.4%, K value = 0.93, alcohol excess r = 1.17, NCO: 1oh (material ratio = 3 containing hydroxyl in castor oil), using trimerization catalysis, termination, residue sealing method Process steps: add TDI, castor oil and neopentyl glycol into the reactor according to the formula, add calcium naphthenate to 120 ℃, stir and heat it to 240 ℃, alcoholysis reaction (2-3) h, sample and test its transparency, cool it to 180 ℃ after passing the test, add trimellitic anhydride and DMPA to react for 40 min, cool it to 120 ℃ and add toluene for dilution, heat it to 134 ℃ and return for dehydration, cool it to 60 ℃ after the water is completely removed, Add TDI for 2 hours, add 10% toluene phosphate solution and stir it up, rise to 70 ℃ for reaction (3-4) h, test the content of NCO at 12%, free TDI at 9.5%, add 10% alkylphosphine solution and stir it up, rise to 80 ℃ for reaction (2-3) H (or cool to 25 ℃ and let it stand for 7 days), test the free TDI < 0.3%, add 10% benzoyl chloride solution and 10% dimethylpyrazole solution and stir it up to 90 ℃ for reaction for 15 min, vacuum and decompress to remove all toluene, Add hydrophilic solvent, adjust the solid content to 50%, add triethylamine and n-toluenediol amine to 50 ℃, adjust the pH value to 8.5, raise the temperature to 60 ℃ to react to transparent, lower the temperature to 40 ℃ to filter and discharge 7 Formula of waterborne polyester polyurethane product (component a): Oh: NCO (mass ratio of substances = 1.5:1, K value = 1.02, alcohol excess r = 1.18 Process steps: according to the formula, add neopentyl glycol, adipic acid, phenyltrimethyl anhydride and DMPA into the reactor, introduce CO2 gas, heat up to 120 ℃, add tetraisopropyl titanate, stir and heat up to 180 ℃, after reaction for 2h, sample and test its acid value every 30min until it reaches 79mgkoh / g, hydroxyl value reaches 79.5, cool down to 130 ℃, add xylene, heat up to 150 ℃, reflux dehydration, after dehydration, Recover xylene by vacuum, add acetone for dilution when the temperature is reduced to 80 ℃, keep the temperature at 60 ℃, add TDI dropwise for 1.5h, add 10% phosphoric acid (toluene) solution to mix evenly after dripping, rise the temperature to 70 ℃ for reaction (4-5) h, test the free TDI ＜ 0.2%, add 50% phenol (toluene) solution to rise the temperature to 80 ℃ for 15min, and then rise the temperature to 90 ℃, distill 1 / 2 of acetone, keep the temperature at 70 ℃ for standby In another reactor equipped with rapid agitation, add n-toluenediol amine, triethylamine, ethylenediamine and deionized water to start the rapid agitation, slowly add the above materials with heat preservation at 70 ℃ to the reactor, neutralize the reaction at 60 ℃ and make the reaction transparent, raise the temperature to 70 ℃, extract the air and reduce the pressure, distill all the remaining acetone, lower the temperature to 40 ℃, filter and discharge the materials 8 The formula of waterborne soybean oil polyester polyurethane product (component a): Oh: NCO (mass ratio of substances = 1:1.5, resin K value = 1.019, alcohol excess r = 1.3, r = 1.5, oil degree 56% Process steps: add soybean oil fatty acid, castor oil fatty acid, pentaerythritol and neopentyl glycol into the reactor according to the formula, inject CO2 gas, add dibutyltin dilaurate to 120 ℃ for stirring, raise temperature to 220 ℃, react for 3h, cool temperature to 180 ℃, add isophthalic acid, trimethyl benzoic anhydride and DMPA to react for 2h at 180 ℃, and then take samples every 30min to test the acid value until it reaches 75mgkoh / g, When the hydroxyl value is 80, toluene is added when the temperature is reduced to 120 ℃, refluxed and dehydrated when the temperature is increased to 132 ℃, and then 10% phenol toluene solution is added when the temperature is reduced to 65 ℃ to mix evenly, TDI is added into the monomer drop adding kettle to start adding, after 1.5h dropping, the temperature is increased to 70 ℃ to react for 4h, 80 ℃ LH, the free TDI is tested to be 0.2%, 50% phenol (toluene) solution is added to mix evenly, and the temperature is increased to 90 ℃ to react for 15min, and then 2 / 3 toluene is removed by vacuum decompression, Add isobutanol to reduce temperature to 50 ℃, add triethylamine, xylene ethanolamine and 1 / 3 deionized water, adjust pH value to 8.6, raise temperature to 60 ℃ and react to be transparent, vacuum out all toluene, add the remaining deionized water, adjust solid content to 50%, filter and discharge 9 The formula of alkyd polyurethane product (component a): Oh: NCO (mass ratio of substances = 1:1.5, K value of resin = 1.01, alcohol excess r = 1.314, r = 1.499, oil degree = 55.2%, theoretical NCO content = 228% Technological steps