Composite modified aqueous polyurethane resin and its preparation method

A water-based polyurethane and composite modification technology, applied in the direction of coating, can solve the problems of poor water resistance, solvent resistance and weather resistance, and insufficient cross-linking density of the paint film, and achieve the effects of good water resistance, low cost and high gloss.

Inactive Publication Date: 2012-11-21
上海展辰涂料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Water-based polyurethane dispersion is a commonly used resin for water-based wood lacquers. Single-modified water-based polyurethane resins are poor in water resistance, solvent resistance, and weather resistance, mainly because the crosslinking density of the paint film is not high enough.

Method used

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  • Composite modified aqueous polyurethane resin and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of preparation method of the aqueous polyurethane resin of composite modification, comprises the following steps:

[0054] (1) Add 102.5g of polyether glycol, 23g of castor oil, and 90.5g of isophorone diisocyanate in a 1000mL four-neck flask equipped with a stirring device, a thermometer and a nitrogen protection, and start stirring and heating at the same time, Insulate at 80-90°C for 2 hours;

[0055] (2) Add 11.6g 1,4-butanediol, 10g epoxy resin E20 (product of Suzhou Sutong Resin Co., Ltd.), 0.1g dibutyltin dilaurate, 15.6g dimethylol propionic acid, 80g N-formazan Base pyrrolidone, at 80-84 ℃, keep warm for 30 minutes;

[0056](3) Start to measure NCO. When the NCO value reaches 1.97%, cool down to below 40°C and add vinyl monomers (50g methyl methacrylate, 10g butyl acrylate, 8g N-methylol acrylamide);

[0057] (4) Add 10.1 g of triethylamine, stir at 2100 rpm for 30 minutes, add 450 g of deionized water and 4.0 g of ethylenediamine while stirring at 250...

Embodiment 2

[0060] A kind of preparation method of the aqueous polyurethane resin of composite modification, comprises the following steps:

[0061] (1) Add 90g of polyester diol, 35g of castor oil, and 63g of toluene diisocyanate into a 1000mL four-neck flask equipped with a stirring device, a thermometer and nitrogen protection in sequence, and start stirring and heating at the same time, at 80-90°C keep warm for 2 hours;

[0062] (2) Add 10.4g diethylene glycol, 10g epoxy resin E44 (Suzhou Sutong Resin Co., Ltd. product), 0.1g stannous octoate, 13.6g dimethylol propionic acid, 80g N-methylpyrrolidone, At 80-84°C, keep warm for 30 minutes;

[0063] (3) Start to measure NCO, when the NCO value reaches 1.88%, cool down to below 40°C, add vinyl monomers (52g methyl methacrylate, 8g butyl acrylate, 2g 2-hydroxyethyl methacrylate , 8g N-methylolacrylamide);

[0064] (4) Add 10.3g triethylenediamine, 2 Stir at 100 rpm for 30 minutes, then add 450 g of deionized water and 4.5 g of isophoro...

Embodiment 3

[0067] A kind of preparation method of the aqueous polyurethane resin of composite modification, comprises the following steps:

[0068] (1) Add 112.5g polyether glycol, 33g castor oil, 90.5g 4,4'-diphenylmethane diisocyanate in a 1000mL four-necked flask equipped with stirring device, thermometer and nitrogen protection successively, simultaneously Start stirring and heating, and keep warm at 80-90°C for 2 hours;

[0069] (2) Add 12.6g 1,6-hexanediol, 10g epoxy resin E51 (product of Suzhou Sutong Resin Co., Ltd.), 0.1g N-methylmorpholine, 14.8g dimethylolbutyric acid, 80g N- Ethylpyrrolidone, at 80-84°C, keep warm for 30 minutes;

[0070] (3) Start to measure NCO, when the NCO value reaches 1.16%, cool down to below 40°C, add vinyl monomers (51g methyl methacrylate, 9g butyl acrylate, 2g isobornyl methacrylate, 8g N -methylolacrylamide), cooling to below 40°C;

[0071] (4) Add 11.2g of N,N-dimethylethanolamine, stir at 2100rpm for 30 minutes, add 515g of deionized water an...

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Abstract

A composite modified aqueous polyurethane resin comprises 6-19wt% of diisocyanate, 6-15wt% of a macro-molecular polyol, 2-15wt% of castor oil, 1-5wt% of a micro-molecular chain extender, 1-8wt% of an epoxy resin, 2-10wt% of a hydrophilic chain extender, 1-4wt% of a neutralizer, 0.01-0.1wt% of a catalyst, 5-15wt% of a vinyl monomer, 2-15wt% of a solvent, 0.5-2wt% of a post chain extender, 0.01-0.5wt% of an initiator and 50-60wt% of deionized water. A preparation method of the composite modified aqueous polyurethane resin comprises the following steps: 1, adding the macro-molecular polyol, the castor oil and the diisocyanate to a reaction vessel, stirring, heating to 80-90DEG C, and maintaining the temperature for 2h; 2, adding the micro-molecular chain extender, the epoxy resin, the catalyst, the hydrophilic chain extender and the solvent, and maintaining the temperature at 80-84DEG C for 30min; 3, detecting NCO, cooling to below 40DEG C, and adding the vinyl monomer; 4, adding the neutralizer, stirring at a high speed for 30ming, adding the deionized water and the post chain extender, stirring at a middle speed for 10min, and heating to 80DEG C; and 5, adding the initiator, maintaining the temperature for 2h, cooling to 30DEG C, and filtering to obtain the composite modified aqueous polyurethane. The composite modified aqueous polyurethane resin synthesized in the invention has the advantages of very good water dispersity and very good storage stability.

Description

technical field [0001] The invention belongs to the technical field of coatings, and specifically relates to a composite modified water-based polyurethane resin and a preparation method thereof, especially for preparing water-based wood varnishes. Background technique [0002] Water-based wood lacquer uses water as the dispersion medium. It is non-toxic, tasteless, environmentally friendly, and harmless to the human body. It is widely used in the decoration and protection of wooden doors and windows, furniture, floors and bamboo utensils. new hotspot. [0003] Compared with foreign countries, the application range of water-based wood lacquers in my country is still very limited, and the resins used in water-based wood lacquers still rely on imports to a large extent. The main reason is that the paint film of domestic water-based wood paint still has a certain gap compared with solvent-based paint in terms of hardness, water resistance, solvent resistance, gloss and other pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08G18/67C08G18/58C09D151/08
Inventor 郭玉刘志刚朱强
Owner 上海展辰涂料有限公司
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