Preparation method of hyperbranched water-based polyurethane hydroxy component

A polyurethane hydroxyl and water-based technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of long drying time of water-based two-component polyurethane paint film, low molecular weight of the final product, poor hardness, etc., and achieve high branching degree , Increase the cross-linking density, increase the effect of contact probability

Active Publication Date: 2013-07-03
岳阳海玖科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The document "Preparation of Hyperbranched Polyesteramide / Polyurethane Aqueous Dispersion and Its Film-forming Properties" (Tang Jinwei, Xiang Jingjing, etc. published in "Coating Industry", 2008, 38 (9): 18-21) hyperbranched terminal hydroxyl Polyester-amide was grafted onto the end-NCO polyurethane prepolymer to obtain a polyurethane / hyperbranched polyester-amide hybrid aqueous dispersion, and the end-NCO polyurethane prepolymer was obtained by toluene-diisocyanate, The reaction of dimethylolpropionic acid and n-butanol makes the molecular weight of the final product low, and the water-based two-component polyurethane paint film formed after adding a curing agent takes a long time to dry and has poor hardness.

Method used

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  • Preparation method of hyperbranched water-based polyurethane hydroxy component
  • Preparation method of hyperbranched water-based polyurethane hydroxy component
  • Preparation method of hyperbranched water-based polyurethane hydroxy component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 86.09g methyl acrylate, 105.14g diethanolamine and 100ml methanol in a four-necked flask, the mixture is at room temperature and logical N 2 Under normal circumstances, after stirring for 30 minutes, the temperature was raised to 35°C and maintained for 4 hours, and then vacuumed to remove methanol to obtain a colorless and transparent oily N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer.

[0042] Weigh 1.36g of pentaerythritol, 7.6492g of N, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer and 0.04g of p-toluenesulfonic acid in a four-necked flask, heat the mixture to 120h°C for 2h, then add 15.2984g of N , N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer and 0.08g p-toluenesulfonic acid were placed in a four-necked flask, kept at 120h°C for 2h, and finally vacuumed to remove the generated methanol to obtain a light yellow oil The second generation of hydroxyl-terminated hyperbranched poly(amine-ester).

[0043]Weigh 1.48g of ...

Embodiment 2

[0046] Weigh 86.09g methyl acrylate, 105.14g diethanolamine and 100ml methanol in a four-necked flask, the mixture is at room temperature and logical N 2 Under normal circumstances, after stirring for 30 minutes, the temperature was raised to 35°C and maintained for 4 hours, and then vacuumed to remove methanol to obtain a colorless and transparent oily N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer.

[0047] Weigh 1.36g pentaerythritol, 7.6492g N, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer and 0.04g p-toluenesulfonic acid in a four-neck flask, heat the mixture to 120h°C for 1h, then add 15.2984gN , N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer and 0.08g p-toluenesulfonic acid in a four-necked flask, kept at 120h°C for 1h, and continued to add 30.5968g N, N-dihydroxyethyl-3 - methylalanine monomer and 0.16g p-toluenesulfonic acid in a four-necked flask, kept at 120h°C for 2h, and finally evacuated to remove the generated methanol t...

Embodiment 3

[0051] Weigh 86.09g methyl acrylate, 105.14g diethanolamine and 100ml methanol in a four-necked flask, the mixture is at room temperature and logical N 2 Under normal circumstances, after stirring for 30 minutes, the temperature was raised to 35°C and maintained for 4 hours, and then vacuumed to remove methanol to obtain a colorless and transparent oily N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer.

[0052] Weigh 1.36g pentaerythritol, 7.6492g N, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer and 0.04g p-toluenesulfonic acid in a four-neck flask, heat the mixture to 120°C for 0.5h, then add 15.2984 gN, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer and 0.08g p-toluenesulfonic acid in a four-necked flask, kept at 120°C for 0.5h, and continued to add 30.5968g N, N-dihydroxyethyl -Methyl 3-aminopropionate monomer and 0.16g p-toluenesulfonic acid were placed in a four-necked flask, kept at 120°C for 1h, and then 61.1936g N, N-dihydroxyeth...

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Abstract

The invention relates to a preparation method of a hyperbranched water-based polyurethane hydroxy component, comprising the following steps: subjecting an acrylate monomer with dihydric amine to generate a colorless transparent oily monomer A1; subjecting the monomer A1 with an monomer containing three or four hydroxys to ester exchange reaction, and adding materials according to proliferation times to obtain hydroxyl-terminated hyperbranched poly (amine-ester) A2; subjecting diisocyanate and an oligomer dihydric alcohol to react with an dihydric alcohol containing one carboxyl to generate a polyurethane prepolymer B; adding the hydroxyl-terminated hyperbranched poly (amine-ester) A2 into the polyurethane prepolymer B, adding a neutralizer to neutralizing, and adding water to dissolve to obtain the hyperbranched water-based polyurethane hydroxy component. The invention has the advantages that the prepared hyperbranched water-based polyurethane hydroxy component has low viscosity and high solid content, can be mixed uniformly with water-dispersible isocyanate curing agent to form a film without adding a film forming additive after being aired at normal temperature, is non-toxic andodorless and can not pollute the environment, and the hardness, the water resistance and the impact resistance of the film can be significantly improved.

Description

technical field [0001] The invention relates to a preparation method of a hyperbranched waterborne polyurethane hydroxyl component with a spherical molecular structure, and to a two-component waterborne polyurethane coating composed of the hyperbranched waterborne polyurethane hydroxyl component obtained by the method. Background technique [0002] Due to the advantages of good fluidity, low viscosity, easy film-forming, multi-functionality, and good solubility, hydroxyl-terminated hyperbranched polymers are widely used in coatings, polymer blending and modification, medical and biological materials, etc. good characteristics. Because the molecule can provide a lot of terminal hydroxyl groups that can be modified, and the functional groups can be diverse, as well as the special molecular shape, it is not easy to entangle the macromolecular chains, and when the molecular weight increases or the concentration increases, it can maintain a low viscosity. , so that it has unique...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/64C08G18/32C08G18/12C09D175/04
Inventor 刘胜波鲁慧牛永华张良均
Owner 岳阳海玖科技有限公司
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