A kind of waterborne polyurethane resin for coating and preparation method thereof

A technology of water-based polyurethane and resin, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor performance of water-based polyurethane, inconvenient on-site construction, high viscosity of oil-based polyurethane, etc., and achieve fast surface drying of the coating film, which is beneficial to the site The effect of construction and long pot life

Active Publication Date: 2022-05-27
ZHUHAI FEIYANG NOVEL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The oily polyurethane used in conventional polyurethane coatings has a high viscosity, which is inconvenient for on-site construction
Moreover, the performance of traditional water-based polyurethane is poor, and it cannot have good adhesion and flexibility while having good hardness.

Method used

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  • A kind of waterborne polyurethane resin for coating and preparation method thereof
  • A kind of waterborne polyurethane resin for coating and preparation method thereof
  • A kind of waterborne polyurethane resin for coating and preparation method thereof

Examples

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preparation example Construction

[0039] A second aspect of the present invention provides the above-mentioned preparation method of the water-based polyurethane resin, which comprises the following steps:

[0040] (1) Under nitrogen protection, diisocyanate is added into the reaction flask, the temperature is controlled at 50-70° C., and the diol is added dropwise to react with it, and the reaction is stopped when the -NCO value reaches the theoretical value to obtain compound A;

[0041] (2) Under nitrogen protection, add compound A into the reaction flask, control the temperature to 60-80°C, and dropwise add the N-methylpyrrolidone solution of dimethylolpropionic acid (DMPA) to react with it, and the detection-NCO value reaches the theoretical value That is, stop the reaction to obtain compound B;

[0042] (3) Under nitrogen protection, under the condition of avoiding light, add an excess of 5-20wt% diamine into the reaction flask, at room temperature, add compound B dropwise to react with it, after detecti...

Embodiment 1

[0065] Example 1 : A water-based polyurethane resin is provided, which has the following structural formula:

[0066]

[0067] The preparation method of above-mentioned water-based polyurethane resin comprises the following steps:

[0068] (1) Under nitrogen protection, weigh 666.8g IPDI into the reaction flask, control the temperature to 60±5°C, slowly add 300g PEG200 dropwise to react with it, and stop the reaction when the detection-NCO value reaches the theoretical-NCO value to obtain compound A1;

[0069] (2) Under nitrogen protection, weigh 580g of compound A1 into a reaction flask, control the temperature to 70±5°C, slowly add 60.3g of DMPA NMP solution dropwise to react with it, and stop the reaction when the detection-NCO value reaches the theoretical-NCO value to obtain compound B1;

[0070] (3) nitrogen protection, weigh 548.5g of diamine and add it to the reaction flask, at room temperature, slowly add 640.3g of compound B1 dropwise to react with it, detect the...

Embodiment 2

[0074] Example 2 : A water-based polyurethane resin is provided, which has the following structural formula:

[0075]

[0076] The preparation method of above-mentioned water-based polyurethane resin comprises the following steps:

[0077] (1) Under nitrogen protection, weigh 666.8g IPDI into the reaction flask, control the temperature to 60±5°C, slowly add 600g PEG400 dropwise to react with it, and stop the reaction when the detection-NCO value reaches the theoretical-NCO value to obtain compound A2;

[0078] (2) Under nitrogen protection, weigh 760g of compound A2 into the reaction flask, control the temperature to 70±5°C, slowly add 60.3g of DMPA NMP solution dropwise to react with it, and stop the reaction when the detection-NCO value reaches the theoretical-NCO value to obtain compound B2;

[0079] (3) nitrogen protection, weigh 548.5g of diamine and add it to the reaction flask, at room temperature, slowly add 820.3g of compound B2 dropwise to react with it, detect ...

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Abstract

The invention relates to the technical field of polymer materials, in particular to a water-based polyurethane resin used for coatings and a preparation method thereof. The water-based polyurethane resin used for coatings of the present invention is prepared by prepolymerizing isocyanate and diol, and then respectively extending chains under the action of hydrophilic functional components and diamines as chain extenders. Compared with the prior art, the hydrophilic polyurethane resin of the present invention makes the polyurethane water-based by introducing a hydrophilic chain extender, and has excellent emulsifying ability. Moreover, the water-based polyurethane resin provided by the present invention is used in conjunction with the isocyanate HDI trimer, and the emulsification is good; it has a longer activation period, which is beneficial to on-site construction; the surface of the coating film dries quickly, and the coating film has higher hardness and better Adhesion and flexibility.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an aqueous polyurethane resin used for coatings and a preparation method thereof. Background technique [0002] Compared with the polyurethane structure, the stability of the C-N bond in the polyurea structure is greater than that of the C-O bond in the structure, and the polarity of the urea group is large, which makes the molecular structure of the polyurea more stable, and the polyurea has excellent corrosion resistance, acid and alkali resistance. , aging resistance and good mechanical properties, can be cured at low temperature, and the coating is continuous and dense. Therefore, the synthesis of polyurethane-polyurea block resin is a means to improve the performance of polyurethane. [0003] At present, water-based coatings are a research hotspot, and they have unique advantages: water can be used as a diluent, which reduces the use of organic solvents, thereby re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/75C08G18/48C08G18/34C08G18/32C09D175/08
CPCC08G18/792C08G18/755C08G18/4825C08G18/4841C08G18/348C08G18/3212C09D175/08
Inventor 徐涛鲁晓东曾志尧杨轩龙绪俭熊东路肖增钧李斌仁陈林生
Owner ZHUHAI FEIYANG NOVEL MATERIALS
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