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Preparation method of light-resistant waterborne polyurethane

A technology of water-based polyurethane and light resistance, applied in the field of preparation of water-based polyurethane, can solve the problems of lack of rigid benzene ring, low hardness of water-based polyurethane coating film, poor water resistance and solvent resistance, etc. low cost effect

Inactive Publication Date: 2013-05-01
上海力太化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the field of use is often exposed to sunlight, the sun’s rays contain a large amount of ultraviolet light that is harmful to light-colored objects, and its wavelength is 290~460nm. These ultraviolet rays change the color of the material surface through chemical oxidation and reduction, affecting the appearance of the surface.
[0003] At present, aromatic isocyanates are often used as raw materials for polyurethane, but polyurethane prepared from aromatic isocyanates is prone to yellowing, which cannot meet the needs of varnishes, white paints, and outdoor decorations. Therefore, aliphatic isocyanates are often used to prepare water-based polyurethane dispersions with light resistance. The lack of rigid benzene ring in the family molecular structure, the synthetic water-based polyurethane coating film has low hardness, poor water resistance and solvent resistance, and it is difficult to meet the market demand for light-resistant polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] (1), in the 500ml four-neck flask that stirring blade, thermometer, condenser tube are housed, polytetrahydrofuran ether glycol 10.0g is mixed with isophorone diisocyanate 35.5g, dibutyltin dilaurate catalyst 0.07g Under the condition of existence, stirred and reacted at 70°C for 2 hours to obtain 45.3g of polyurethane prepolymer;

[0019] (2), add hydrophilic chain extender dimethylol propionic acid 2.02g in the polyurethane prepolymer, the stirring reaction time is 30min, add tetrakis hydroxymethyl phosphorus sulfate 0.09g and carry out cross-linking, the stirring reaction time is 30min, Add 4.5g of butanone solvent, stir and react at 70°C for 1.0h, add 3.05g of triethylamine for neutralization, stir for 40min, add 150g of water for emulsification, and obtain 202.5g of hydrophilic polyurethane with a solid content of 24.9%. Transfer to the 500ml beaker for subsequent use;

[0020] (3), emulsifying agent 10g is dissolved in 50g water, adds nano iron oxide 2g, 2,4-dihy...

example 2

[0023] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condensation pipe are housed, polytetrahydrofuran ether glycol 10.0g is mixed with hexamethylene diisocyanate 67.2g, dibutyltin dilaurate catalyst 0.31g Under the condition of existence, stir and react at 90°C for 4h to obtain 77.5g polyurethane prepolymer;

[0024] (2), add hydrophilic chain extender dimethylol butyric acid 10.71g in polyurethane prepolymer, stirring reaction time is 60min, add trimethylolpropane 0.62g to carry out cross-linking, stirring reaction time is 30min, add Butanone solvent 23.3g, stirred and reacted at 90°C for 3.5h, added 5.22g of triethylamine for neutralization, stirred for 60min, added 150g of water for emulsification, and obtained 267.4g of hydrophilic polyurethane with a solid content of 33.2%. into the 500ml beaker for subsequent use;

[0025] (3), sodium dodecylbenzene sulfonate 10g is dissolved in 50g water, adds nano silicon dioxide 5g, o-hydroxybenzoic acid phenyl ...

example 3

[0028] (1), in the 500ml four-necked flask that stirring blade, thermometer, condenser tube are housed, polytetrahydrofuran ether glycol 10.0g is mixed with isophorone diisocyanate 62.2g, dibutyltin dilaurate catalyst 0.20g Under the condition of existence, stir and react at 80°C for 3 h to obtain 72.3 g of polyurethane prepolymer;

[0029] (2), add hydrophilic chain extender dimethylol propionic acid 6.2g in polyurethane prepolymer, stirring reaction time is 45min, continue to add tetrakis hydroxymethyl phosphorus sulfate 0.36g, stirring reaction time is 30min, add butyl Ketone 14.5g, stirred and reacted at 80°C for 2 hours, added 4.9g of triethylamine for neutralization, stirred and reacted for 50min, added 160g of water for emulsification, formed 257.9g of water-based polyurethane with a solid content of 32.3%, transferred to a 500ml beaker in standby;

[0030] (3), sodium hexametaphosphate 10g is dissolved in 50g water, adds nano-zinc oxide 3.5g, phenyl o-hydroxybenzoate ...

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PUM

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Abstract

The invention discloses a preparation method of light-resistant waterborne polyurethane, which comprises the steps of mixing polytetramethylene ether glycol with diisocyanate in the presence of a dibutyltin dilaurate catalyst, stirring at 70-90 DEG C for reaction for 2-4h, obtaining a polyurethane prepolymer, adding a hydrophilic chain extender, a polyhydroxyl compound and butanone into the polyurethane prepolymer, stirring at 70-90 DEG C for reaction for 1.0-3.5 h, adding triethylamine for neutralizing, stirring for reaction for 40-60min, adding water for emulsification to form hydrophilic polyurethane, adding a nano emulsion into a hydrophilic polyurethane system, shearing and stirring for 40-60min under the condition that a pH value is 7, and obtaining light-resistant waterborne polyurethane. Prepared light-resistant waterborne polyurethane is environment-friendly and low in price, and can meet the demand of a market on a property of light-resistant polyurethane.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane, in particular to a preparation method of light-resistant water-based polyurethane. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, is non-toxic, tasteless, and does not pollute the environment. It is widely used in the preparation of water-based paints and paints. However, because the field of use is often exposed to sunlight, the sun’s rays contain a large amount of ultraviolet light that is harmful to light-colored objects, and its wavelength is 290~460nm. These ultraviolet rays cause color changes on the surface of the material through chemical oxidation and reduction, affecting the appearance of the surface. . [0003] At present, aromatic isocyanates are often used as raw materials for polyurethane, but polyurethane prepared from aromatic isocyanates is prone to yellowing, which cannot meet the needs of varnishes, white paints, a...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/48C08G18/34C08G18/32C08G18/10C08K13/02C08K3/22C08K3/36C08K5/134C08K5/132C08K5/13C08K5/17
Inventor 段宝荣高龙宋宇
Owner 上海力太化学有限公司
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