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Waterborne polyurethane dispersion, preparation method thereof and self-crosslinking waterborne polyurethane waterproof coating

A water-based polyurethane and dispersion technology, which is applied in the field of coatings and architectural waterproof coatings, can solve the problems that cannot truly reflect the waterproof state of water-based polyurethane waterproof coatings, and achieve excellent mechanical properties, ensure durability, and improve adhesion.

Pending Publication Date: 2022-07-29
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating tensile strength and elongation at break prepared by the waterborne polyurethane coating composition in this patent can meet the requirements under standard conditions, and the water absorption rate can be less than 10%, but the propylene glycol used in the coating formulation, It has the effect of water retention and cannot truly reflect the real waterproof state of water-based polyurethane waterproof coatings

Method used

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  • Waterborne polyurethane dispersion, preparation method thereof and self-crosslinking waterborne polyurethane waterproof coating
  • Waterborne polyurethane dispersion, preparation method thereof and self-crosslinking waterborne polyurethane waterproof coating
  • Waterborne polyurethane dispersion, preparation method thereof and self-crosslinking waterborne polyurethane waterproof coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Heat 325.00g DL-2000D, 4.08g MPEG-1200, 6.39g DMPA and 6.57g 1,2-PG to 55°C and stir to mix well, then add 107.60g HMDI, finally add 67.60g acetone and 0.18g 8108, heated up to 75°C and reacted for 2 hours, then added 0.90 g of HBA and continued the reaction at 80°C for 3 hours to form a prepolymer.

[0099] Reduce the temperature to below 50 °C, add 2.70 g of acetone solution of 1010 and 2.70 g of 292 to the prepolymer (total 527.46 g) and mix well, add 5.30 g of TEA below 40 °C and neutralize for 5 minutes, then meter in 3.35 g Gram EDA and 1.35 g KH-792 (18.80 g acetone diluted) were reacted at 35-40° C. for 15 minutes to generate a polyurethane polymer precursor solution.

[0100] Add 556.63 g of deionized water under the condition of shearing and dispersing at 1200-1500 r / min of the dispersing machine, add 0.32 g of ADH (diluted with 3.20 g of water) and continue stirring for 10 minutes. Finally, the acetone was distilled off under reduced pressure to obtain an...

Embodiment 2

[0102] Heat 283.00g DL-2000D, 47.00g PTMEG-2000, 4.62g MPEG-1200, 8.22g DMPA and 9.89g NPG to 55°C and stir to mix well, then add 25.00g HMDI and 65.00g TDI-80 with 48.86 g of acetone and 0.13 g of acetone added at the end 8108, heated up to 75°C and reacted for 1 hour, then added 1.33 g of HBA and continued the reaction at 75°C for 2 hours to form a prepolymer.

[0103] Lower the temperature to below 50°C, add 2.22g of acetone solution of 1010 and 2.22g of 292 to the prepolymer (total 363.40g) and mix well, add 5.58g of TEA below 40°C and neutralize for 5 minutes, then meter in 8.43g g NHEEA and 1.78 g KH-792 (40.83 g acetone diluted) were reacted at 30-35° C. for 15 minutes to generate a polyurethane polymer precursor solution.

[0104] Add 556.63 g of deionized water under the condition of shearing and dispersing at 1200-1500 r / min of the dispersing machine speed, add 0.47 g of ADH (diluted with 4.70 g of water) and continue stirring for 10 minutes. Finally, the aceto...

Embodiment 3

[0106] Heat 251.00g DL-2000D, 84.00g PTMEG-2000, 5.30g MPEG-1200, 9.35g DMPA and 7.60g 1,2-PG to 50°C and stir and mix well, then add 92.00g TDI-80, finally added 54.10 g of acetone and 0.07 g of 8108 catalyst, heated to 70 °C and reacted for 1 hour, then added 1.80 g of HBA and continued the reaction at 70 °C for 2 hours to form a prepolymer.

[0107] Reduce the temperature to below 50 °C, add 1.80 g of acetone solution of 1010 and 1.80 g of 292 to the prepolymer (total 313.70 g), mix well, add 5.64 g of TEA below 40 °C and neutralize for 5 minutes, then meter in 3.30 g Gram EDA, 6.69 g NHEEA and 2.70 g KH-792 (50.79 g acetone diluted) were reacted at 30-35° C. for 10 minutes to form a polyurethane polymer precursor solution.

[0108] Add 556.63 g of deionized water under the condition of shearing and dispersing at 1200-1500 r / min of the dispersing machine, add 0.63 g of ADH (diluted with 6.30 g of water) and continue stirring for 10 minutes. Finally, the acetone was distil...

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Abstract

The invention discloses a water-based polyurethane dispersion, a preparation method of the water-based polyurethane dispersion and a self-crosslinking type water-based polyurethane waterproof coating. The self-crosslinking type water-based polyurethane waterproof coating comprises the water-based polyurethane dispersion, the waterborne polyurethane dispersoid is prepared by the following steps: reacting components A) polyisocyanate, B) polyether polyol and / or polyether monohydric alcohol, C) micromolecular dihydric alcohol, D) dyhydroxy carboxylic acid, E) o-carbonyl phenylboronic acid ester compound and F) amino compound to generate a polymer precursor, and then reacting the polymer precursor with G) hydrazide compound to generate an aldehyde / ketone-hydrazine cross-linked polyurethane polymer. And water is introduced to form a waterborne polyurethane dispersion. The self-crosslinking type waterborne polyurethane waterproof coating disclosed by the invention has excellent mechanical properties, low water absorption and heat / acid / alkali resistance, is an environment-friendly polymer waterproof coating, and can be used for waterproofing of outer walls, toilets, kitchens, basements and the like.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to the field of architectural waterproof coatings, in particular to an aqueous polyurethane dispersion and a self-crosslinking water-based polyurethane waterproof coating prepared therefrom. Background technique [0002] Polyurethane waterproof coating has good film formation and elasticity, and can form a seamless and complete waterproof layer after curing. The good film-forming properties of the polyurethane waterproof coating make the structure of the coating film compact and can resist a certain impact and puncture ability; at the same time, the good elasticity of the polyurethane film enables the coating film to absorb the stress generated by the deformation of the building through deformation when it is extended. It ensures the integrity of the coating film and also ensures the waterproof function. [0003] At present, solvent-based polyurethane coatings still occupy a major position ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/34C08G18/28C08G18/12C09D175/08
CPCC08G18/6692C08G18/4804C08G18/3206C08G18/348C08G18/2825C08G18/12C09D175/08C08G18/3228C08G18/3893C08G18/3271
Inventor 韩克舒国玉晋云全王震景传明纪学顺
Owner WANHUA CHEM GRP CO LTD
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