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Preparation method of high-solid-content hydroxyl waterborne polyurethane resin

A water-based polyurethane and hydroxyl-type technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor elasticity of water-based polyurethane coatings, increase the drying time of coating films, and weak dispersion of curing agents, etc., to increase flexibility Excellent properties, improved crosslink density, and chemical resistance

Inactive Publication Date: 2014-02-12
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the hydroxyl-based water-based polyurethane resins on the market have a linear structure, and the relative molecular weight is low, the solid content is not high, the dispersibility of the curing agent is not strong, it is not conducive to construction, and the drying time of the coating film is increased.
At the same time, the two-component water-based polyurethane coating prepared at the same time has poor elasticity and bad hand feeling, so it is not suitable for elastic coatings

Method used

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  • Preparation method of high-solid-content hydroxyl waterborne polyurethane resin
  • Preparation method of high-solid-content hydroxyl waterborne polyurethane resin
  • Preparation method of high-solid-content hydroxyl waterborne polyurethane resin

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Experimental program
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preparation example Construction

[0027] The preparation method of high solid hydroxyl type waterborne polyurethane resin, according to the following steps:

[0028] 1) Add polyester diol, hydroxyl-terminated sulfonate polyester diol, small molecule diol, polyol, and hydrophilic monomer into the reaction vessel for mixing and dehydration;

[0029] 2) Slowly add diisocyanate at 60-65°C for 1 hour and keep warm for 1 hour;

[0030] 3) Add a catalyst, raise the temperature to 65-70°C and keep it warm for reaction, and stop heating when the isocyanate content is detected to be less than or equal to 0.1wt%;

[0031] 4) Cool down to 40-50°C, adjust viscosity with acetone, and neutralize to 7-8 with organic amine;

[0032] 5) Add deionized water to disperse for 30 minutes under high-speed stirring at 35-40°C, and remove acetone under reduced pressure to obtain milky white and bluish hydroxyl-type water-based polyurethane resin;

[0033] Wherein, the above-mentioned raw materials are calculated in parts by weight as...

Embodiment 1

[0036] 1) Polybutylene adipate diol (molecular weight 1000), hydroxyl-terminated sulfonate polyester (BY3301 produced by Beijing Baiyuan Chemical Co., Ltd.), octane glycol, polycaprolactone triol (molecular weight 500), 2,2-dimethylolpropionic acid was added to the reaction vessel and mixed, and vacuumed at 0.05MPa, 107°C for 1h to remove moisture;

[0037] 2) Remove the vacuum, pass in nitrogen protection, slowly add isophorone diisocyanate dropwise at 65°C, finish adding dropwise for 1 hour and keep warm for another hour;

[0038] 3) Add stannous octoate, raise the temperature to 70°C and keep it warm for reaction, and stop heating when the isocyanate content is detected to be less than or equal to 0.1wt%;

[0039] 4) Cool down to 50°C, adjust the viscosity with acetone, and neutralize it to 7-8 with dimethylethanolamine;

[0040] 5) Add deionized water to disperse for 30 minutes under high-speed stirring at 45°C, and remove acetone under reduced pressure to obtain milky wh...

Embodiment 2

[0048] 1) Polyneopentyl adipate diol (molecular weight 1000), sulfonate polyester with terminal hydroxyl group (BY3305 produced by Beijing Baiyuan Chemical Co., Ltd.), hexanediol, castor oil, 2,2-diol Methylolpropionic acid was added to the reaction vessel for mixing, and vacuumed at 0.05MPa, 107°C for 1 hour to remove moisture;

[0049] 2) Remove the vacuum, pass in nitrogen protection, slowly add toluene diisocyanate dropwise at 60°C, finish adding dropwise for 1 hour and keep warm for 1 hour;

[0050] 3) Add dibutyltin dilaurate, raise the temperature to 65°C and keep it warm for reaction, and stop heating when the isocyanate content is detected to be less than or equal to 0.1wt%;

[0051] 4) Cool down to 40°C, adjust the viscosity with acetone, and neutralize it to 7-8 with triethylamine;

[0052] 5) Add deionized water to disperse for 30 minutes under high-speed stirring at 35°C, and remove acetone under reduced pressure to obtain milky white and bluish hydroxyl-based po...

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Abstract

The invention discloses a preparation method of a flexible high-solid-content hydroxyl waterborne polyurethane resin. The method comprises the following steps: polyester diol, hydroxyl-terminated sulfonate polyester diol, micromolecule diol, polyol and hydrophilic monomers are added in a reaction container for mixing and dehydrating; diisocyanate is slowly added at 60-65 DEG C for 1 hour, and is kept at the temperature for 1 hour; a catalyst is added for heating to 65-70 DEG C, and is kept at the temperature for reacting; when the content of isocyanate is less than or equal to 0.1 wt%, the heating is stopped; the temperature is decreased to 40-50 DEG C; acetone is used for regulating viscosity, and organic amine is used for neutralizing to 7-8; de-ionized water is added under high-speed stirring at 35-40 DEG C for dispersing 30 minutes; the acetone is removed by relieving pressure to obtain the hydroxyl waterborne polyurethane resin in milky white color accompanied with blue light. Bi-component paint prepared by using the high-solid-content hydroxyl waterborne polyurethane resin has good appearance, good soft flexibility and excellent scrape, wear and chemicals resistance.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing a soft-feeling high-solid hydroxyl-containing water-based polyurethane resin. Background technique [0002] With the improvement of waterborne polyurethane preparation technology and performance requirements, simple one-component waterborne polyurethane can no longer fully meet the market demand, and two-component waterborne polyurethane can make up for the lack of performance of one-component waterborne polyurethane. Two-component water-based polyurethane is composed of hydroxyl-type water-based polyurethane resin containing -OH group and water-based polyisocyanate containing -NCO group. It can self-crosslink and cure at room temperature, and form a film with excellent performance. [0003] Hydroxy-based water-based polyurethane resin uses water as the dispersion medium and does not contain organic solvents. It has the advantages of non-toxic, ...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/67C08G18/66C08G18/42C08G18/44C08G18/46C08G18/48C09D175/06C09D175/08C09D175/14
CPCC08G18/0823C08G18/0828C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/44C08G18/4829C08G18/6625C08G18/664C08G18/6659C08G18/6662C08G18/755C08G18/7614C09D175/06C09D175/08C09D175/14
Inventor 闫福安陈秋芬
Owner WUHAN INSTITUTE OF TECHNOLOGY
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