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Preparation method for yellowing resistant aromatic polycarbonate type waterborne polyurethane coating material

A polycarbonate-type, water-based polyurethane technology, applied in the direction of coating, etc., can solve the problem that the anti-yellowing effect of additives is difficult to last, and achieve the effect of expanding the application field

Inactive Publication Date: 2014-04-16
SHANGHAI CARPOLY PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the compatibility of additives and polymers and the timeliness of additives, the anti-yellowing effect is difficult to last.

Method used

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  • Preparation method for yellowing resistant aromatic polycarbonate type waterborne polyurethane coating material
  • Preparation method for yellowing resistant aromatic polycarbonate type waterborne polyurethane coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Nano TiO 2 Preparation of dispersion

[0025] Accurately weigh 0.300g of sodium hexametaphosphate into a dry 250ml conical flask, add 30ml of DMF to completely dissolve the dispersant, add 3.000g of nano-powder TiO 2 , in an ultrasonic cell pulverizer, ultrasonic at 540w for 30min. Among them, nano powder TiO 2 Rutile type, purity ≥ 99.9%, particle size 25nm. from figure 1 It can be seen in the nano-TiO 2 It has good dispersibility in DMF solution.

[0026] The second step: the preparation of polycarbonate water-based polyurethane emulsion.

[0027] In a four-necked flask equipped with an electric stirrer, a thermometer, a reflux condenser, and a nitrogen tube, add 20.000g of polycarbonate diol, and then add 1.095g of isophorone diisocyanate (IPDI) and 9.857g of diphenyl A mixture of methane diisocyanate (MDI) was placed in an oil bath at 75°C until the NCO reached the theoretical value. Cool down to 40°C, add 1.557g of hydrophilic chain extender dimethy...

Embodiment 2

[0030] Step 1: Nano TiO 2 Preparation of dispersion

[0031] Accurately weigh 0.150g of sodium hexametaphosphate into a dry 250ml conical flask, add 30ml of DMF to completely dissolve the dispersant, add 3.000g of nano-powder TiO 2 , in an ultrasonic cell pulverizer, ultrasonic at 540w for 30min. The nano-powder TiO 2Rutile type, purity ≥ 99.9%, particle size 25nm.

[0032] The second step: the preparation of polycarbonate water-based polyurethane emulsion.

[0033] In a four-necked flask equipped with an electric stirrer, a thermometer, a reflux condenser, and a nitrogen tube, add 20.000g of polycarbonate diol, and then add 0.690g of isophorone diisocyanate (IPDI) and 6.210g of diphenyl A mixture of methane diisocyanate (MDI) was placed in an oil bath at 75°C until the NCO reached the theoretical value. Cool down to 40°C, add 1.883g of hydrophilic chain extender dimethylolbutyric acid (DMBA), and react for 1h. Raise the temperature to 80°C, add 0.154g of secondary chain...

Embodiment 3

[0036] Step 1: Nano TiO 2 Preparation of dispersion

[0037] Accurately weigh 0.210g of sodium hexametaphosphate into a dry 250ml conical flask, add 30ml of DMF to completely dissolve the dispersant, add 3.000g of nano-powder TiO 2 , in an ultrasonic cell pulverizer, ultrasonic at 540w for 30min. The nano-powder TiO 2 Rutile type, purity ≥ 99.9%, particle size 25nm.

[0038] The second step: the preparation of polycarbonate water-based polyurethane emulsion.

[0039] In a four-necked flask equipped with an electric stirrer, a thermometer, a reflux condenser, and a nitrogen tube, add 20.000g of polycarbonate diol, and then add 2.903g of isophorone diisocyanate (IPDI) and 11.612g of diphenyl A mixture of methane diisocyanate (MDI) was placed in an oil bath at 75°C until the NCO reached the theoretical value. Cool down to 40°C, add 2.071g of hydrophilic chain extender dimethylolbutyric acid (DMBA), and react for 1h. Raise the temperature to 80°C, add 1.672g of secondary cha...

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Abstract

The invention relates to a preparation method for a yellowing resistant aromatic polycarbonate type waterborne polyurethane coating material. The preparation method comprises the following specific steps: through adopting a manner of adding a dispersing agent, dispersing nano TiO2 into DMF well; compounding MDI with IPDI and enabling the mixture to react with polycarbonate diol, so as to reduce the reaction degree of the MDI, and obtain waterborne polyurethane emulsion with higher stability; adding the nano-powder TiO2 into the polyurethane emulsion before emulsification, so as to improve the dispersion stability of the nano-powder TiO2 in polyurethane, and adding an anti-oxidant 1010 and an ultraviolet light absorber UV-327 into the waterborne polyurethane emulsion to achieve a better yellowing resistant effect.

Description

technical field [0001] The invention relates to a preparation method of a yellowing-resistant water-based polyurethane coating material, in particular to a preparation method of a yellowing-resistant aromatic polycarbonate type water-based polyurethane coating material. Background technique [0002] Based on the designability and tailorability of polyurethane molecules, polyurethane materials are the only polymer materials with a wide range of physical and chemical properties, so they are widely used in adhesives, coatings, and synthetic leather. , building materials and automation industries. Water-based polyurethane overcomes the serious pollution of solvent-based polyurethane, uses water as the dispersion medium, has the characteristics of non-toxic, energy-saving, safe and reliable, and has been widely used in leather finishing agents since the beginning of research. Although aromatic water-based polyurethane has good mechanical properties when used in coatings, its app...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/12C08G18/76C08G18/75C08G18/66C08G18/44
Inventor 张建赵凤艳李晓周强刘红王琳
Owner SHANGHAI CARPOLY PAINT
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