Preparation method of waterborne polyurethane material with resistance to yellowing

A water-based polyurethane, anti-yellowing technology, used in textiles, papermaking, fiber processing, etc.

Inactive Publication Date: 2012-07-25
王全杰
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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 of waterborne polyurethane material with resistance to yellowing
  • Preparation method of waterborne polyurethane material with resistance to yellowing
  • Preparation method of waterborne polyurethane material with resistance to yellowing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Nano TiO 2 Preparation of dispersion

[0036] Add 0.300g sodium hexametaphosphate and 30ml N,N-dimethylformamide to the container, and completely dissolve the dispersant, then add 3.000g nanometer powder TiO 2 , in an ultrasonic cell pulverizer, ultrasonic pulverization at 540w for 30min to obtain nano-TiO 2 The dispersion is ready for use. The nano-powder TiO 2 It is rutile type, the purity is ≥99.9%, and the particle size is 25nm~50nm. From figure 1 It can be seen in the nano-TiO 2 It has good dispersibility in DMF solution.

[0037] The second step: preparing the water-based polyurethane graft emulsion.

[0038] Add 20.000g of polycarbonate diol, 1.095g of isophorone diisocyanate and 9.857g of diphenylmethane diisocyanate into another container, and then place the container in an oil bath at 75°C for 2 hours After the reaction is complete, cool down to 40°C, add 1.557g of dimethylolbutyric acid, react for 1h, raise the temperature to 80°C, add 1.354g...

Embodiment 2

[0047] Step 1: Nano TiO 2 Preparation of dispersion

[0048] Add 0.150g polyethylene glycol-4000 and 30ml N,N-dimethylformamide to the container respectively, and completely dissolve the dispersant, then add 3.000g nanometer powder TiO 2 , in an ultrasonic cell pulverizer, ultrasonic pulverization at 540w for 30min to obtain nano-TiO 2 The dispersion is ready for use; the nano-powder TiO 2 Rutile type, purity ≥ 99.9%, particle size 40nm.

[0049] The second step: the preparation of polycarbonate water-based polyurethane emulsion.

[0050] In another container, add 20.000g of polycarbonate diol, 0.690g of isophorone diisocyanate and 6.210g of diphenylmethane diisocyanate, and place it in an oil bath at 75°C for 2 hours until the reaction is complete. Cool down to 40°C, add 1.883 g dimethylol butyric acid (, react for 1 hour, heat up to 80°C, add 0.154g 1,4-butanediol and keep it warm for 1 hour to obtain a polyurethane prepolymer; cool down the polyurethane prepolymer to 4...

Embodiment 3

[0053] Step 1: Nano TiO 2 Preparation of dispersion

[0054] Add 0.210g sodium dodecylbenzenesulfonate and 30ml N,N-dimethylformamide to the container respectively, and completely dissolve the dispersant, then add 3.000g nanometer powder TiO 2 , in an ultrasonic cell pulverizer, ultrasonic pulverization at 540w for 30min to obtain nano-TiO 2 ; The nano-powder TiO 2 Rutile type, purity ≥ 99.9%, particle size 50nm.

[0055] The second step: the preparation of polycarbonate water-based polyurethane emulsion.

[0056] Add 20.000g of polycarbonate diol, 2.903g of isophorone diisocyanate and 11.612g of diphenylmethane diisocyanate into another container, and then place the container in an oil bath at 75°C for 2 hours After the reaction is complete, cool down to 40°C, add 2.071 g of dimethylolbutyric acid, react for 1 hour, raise the temperature to 80°C, add 1.672g of 1,4-butanediol, and keep warm for 1 hour to obtain a polyurethane prepolymer; Cool the polyurethane prepolymer t...

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Abstract

The invention relates to a preparation method of a waterborne polyurethane composite material with high resistance to yellowing. The preparation method comprises the following steps of: well dispersing nano-TiO2 in DMF (dimethylformamide) in a way of adding a dispersant; compounding MDI (diphenyl-methane-diisocyanate) with IPDI (isophorone diisocyanate), and reacting with polycarbonate diol to reduce the reaction degree of the MDI so as to get a waterborne polyurethane emulsion with higher stability; and adding nano-powder TiO2 into the polyurethane emulsion before emulsification, improving the dispersion stability of the nano-powder TiO2 in polyurethane, and adding an antioxidant 1010 and an ultraviolet absorbent UV-327 into the waterborne polyurethane emulsion to achieve better resistance to yellowing, wherein the yellowing grade is improved by 1-1.5 grades.

Description

technical field [0001] The invention relates to a preparation method of a yellowing-resistant water-based polyurethane material. Background technique [0002] Based on the designability and tailorability of molecules, polyurethane material is a polymer material with a wide range of physical and chemical properties, so it is widely used in adhesives, coatings, synthetic leather, building materials and the automation industry. 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. [0003] Although aromatic water-based polyurethane has good mechanical properties when used in leather finishing agents, it is very easy to yellow when used in white and light-colored leather due to the conjugated groups that are prone to color development in the structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/44C08K9/04C08K3/22D06M15/572
Inventor 王全杰赵凤艳段宝荣牟宗波
Owner 王全杰
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