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Waterborne polyurethane resin, waterborne polyurethane coating material and preparation method of waterborne polyurethane resin

A technology of water-based polyurethane and resin, applied in the direction of coating, etc., can solve the problems of difficult dissolution and uniform dispersion of nano-silica, unsuitable hardness, scratch resistance, and influence on the permeability of paint film, etc., to achieve convenient and excellent construction The effect of temperature resistance and high light transmittance

Pending Publication Date: 2020-05-01
惠州市安品新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN201110028348.8 discloses a method for preparing a one-component high heat-resistant water-based polyurethane adhesive. Nano-silica is used to modify the water-based polyurethane to prepare a single-component adhesive with a heat-resistant temperature above 160°C. Nano-silica is difficult to dissolve and disperse evenly during the preparation process, and it affects the permeability of the paint film during the curing film formation process, which has limitations in application
[0006] Patent CN101633828A discloses a method for preparing a high heat-resistant water-based polyurethane adhesive. By introducing a silane coupling agent for secondary chain extension and compounding functional polyvinyl alcohol, a high heat-resistant water-based polyurethane adhesive is obtained, but polyethylene Alcohol is soft, not suitable for wood varnishes that require high hardness, scratch resistance, etc.

Method used

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  • Waterborne polyurethane resin, waterborne polyurethane coating material and preparation method of waterborne polyurethane resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation method of modified chain extender is as follows:

[0047] Accurately weigh 400g of glycidyl methacrylate, 4.5g of tetrabutylammonium bromide, and 0.03g of hydroquinone in a four-necked flask with a reflux device, and heat up to 120°C while stirring, and dropwise add 270g of dimethylol Propionic acid and 300g N,N-dimethylformamide mixed solution, after 1 hour of dropwise addition, continue to keep warm at 120°C for 9 hours, raise the temperature to 160°C, and distill off N,N-dimethylformamide under reduced pressure , the catalyst tetrabutylammonium bromide and the residual low-molecular monomer, cooling to room temperature, and filtering to obtain a modified chain extender.

[0048] In addition, the preparation of unsaturated polyester polyol is as follows:

[0049] Add 1mol of itaconic acid and 1.2mol of 1,4-butanediol into a four-necked flask, add 1.5g of stannous chloride and 0.5g of hydroquinone and raise the temperature to 160°C for esterification r...

Embodiment 2

[0051] The preparation method of waterborne polyurethane resin is as follows:

[0052] The unsaturated polyester polyol prepared by 75g embodiment 1, 100g polyester polyol (polyester polyol based on adipic acid, ethylene glycol, diethylene glycol, model PE-1280S, hydroxyl value 79-86 , molecular weight is 1200, Zhejiang Huafon New Materials Co., Ltd.), 40g polyethylene glycol diacrylate (molecular weight 200, from Dongguan Jiumao Industrial Co., Ltd.) vacuum dehydration, add 150g TDI, 60g acetone to react at 65 ° C 2h, take a sample to detect that the NCO content is 2.82g / 100g (the determination of NCO content refers to GB / T29493.6-2013), add dropwise a mixture of 15g dimethylolpropionic acid and 30g N,N-dimethylformamide and 20g The modified chain extender prepared in Example 1 was dropped within 0.5 hours, kept for 1.5 hours, added 2.5g of AIBN, heated to 80°C, slowly added dropwise 25g of vinyl silicone oil (vinyl content 3.1%, kinematic viscosity 100mm 2 / s, from Anhui A...

Embodiment 3

[0054] The preparation method of waterborne polyurethane resin is as follows:

[0055] The unsaturated polyester polyol that 60g embodiment 1 prepares, 120g saturated polyester polyol (the polyester polyol based on adipic acid, diethylene glycol, 1,4-butanediol, PE-2348, hydroxyl value 45-50, the molecular weight is 2350, Zhejiang Huafeng New Material Co., Ltd.), 60g of polyethylene glycol (400) diacrylate (from Dongguan Jiumao Industrial Co., Ltd.) vacuum dehydration at 110 ° C for 2 hours, Cool down to room temperature, add 180g of diphenylmethane diisocyanate (MDI) and 120g of acetone, raise the temperature to 68°C, react for 1.5 hours, and take a sample to detect that the NCO content is 3.1g / 100g (the determination of the NCO content refers to GB / T 29493.6-2013 ), dropwise the mixed solution of dimethylolpropionic acid of 17g and 35g of N,N-dimethylformamide and the modified chain extender prepared in 25g embodiment 1, dropwise finished in 0.5 hour, heat preservation react...

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Abstract

The invention discloses a waterborne polyurethane resin, a waterborne polyurethane coating material and a preparation method of the waterborne polyurethane resin. The preparation method comprises thefollowing steps: mixing saturated polyester polyol, (methyl) acrylate and the like, polyisocyanate and a solvent, reacting, adding a chain extender, a cosolvent, a modified chain extender, a radical initiator and vinyl polysiloxane, neutralizing, cooling, adding water, carrying out dispersing emulsifying, and carrying out a chain extension reaction to obtain the waterborne polyurethane resin. Thewaterborne polyurethane resin disclosed by the invention combines high hardness and high resilience flexibility of polyurethane and temperature resistance, high light transmittance, wear resistance and the like of vinyl polysiloxane, so that the resin grafting rate is high, the emulsion stability is good, and the paint film has excellent glossiness, excellent hardness and excellent heat resistance.

Description

technical field [0001] The invention relates to a water-based polyurethane resin, which is prepared into a water-based polyurethane coating, which has good glossiness and heat resistance. [0002] technical background [0003] Water-based polyurethane is a polymer material that uses water instead of organic solvents as the dispersion medium. It has the advantages of good film-forming properties, high bonding strength, high gloss, strong corrosion resistance, excellent mechanical properties, and environmental protection. It is an alternative to solvent-based polyurethane. The inevitable trend. [0004] However, the current water-based polyurethane transparent varnish for wood protection generally has the problems of low heat resistance and high activation temperature. Due to the characteristics of carbamate in the molecular structure of a single water-based polyurethane material, the heat resistance temperature is usually below 80°C, which cannot meet the dry heat resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F283/12C08F222/20C08F222/14C08G18/68C08G18/67C08G18/42C08G18/12C08G18/34C09D151/08
CPCC08F283/008C08F283/124C08G18/12C08G18/4202C08G18/4247C08G18/68C08G18/4238C08G18/6755C09D151/085C08G18/348C08G18/0823
Inventor 唐建振余栋才吴光飞彭派潜
Owner 惠州市安品新材料有限公司
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