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Hyperbranched water-based polyurethane coating and preparation method thereof

A technology of water-based polyurethane and hyperbranched polyester, which is applied in the direction of polyurea/polyurethane coatings and coatings, and can solve the problems of poor water resistance, solvent resistance and weather resistance

Active Publication Date: 2013-12-18
CHANGCHUN SANHUA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a hyperbranched waterborne polyurethane coating and a preparation method thereof in order to solve the problems of existing hyperbranched waterborne polyurethanes with poor water resistance, solvent resistance and weather resistance

Method used

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  • Hyperbranched water-based polyurethane coating and preparation method thereof
  • Hyperbranched water-based polyurethane coating and preparation method thereof
  • Hyperbranched water-based polyurethane coating and preparation method thereof

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preparation example Construction

[0027] The preparation method of hyperbranched waterborne polyurethane of the present invention preferably comprises as follows:

[0028] Step 1: Hyperbranched Polyester Boltorn TM H40, anhydrous stannous chloride catalyst, antioxidant and maleic anhydride react to obtain modified hyperbranched waterborne polyurethane;

[0029] Step 2: reacting the modified hyperbranched waterborne polyurethane obtained in step 1 with diisocyanate to obtain the first intermediate;

[0030] Step 3: reacting the first intermediate obtained in step 2 with a small molecule chain extender to obtain a second intermediate;

[0031] Step 4: reacting the second intermediate obtained in Step 3 with diaminosulfonate to obtain hyperbranched waterborne polyurethane.

[0032] Hyperbranched polyester Boltorn of the present invention TM H40 refers to the fourth-generation hyperbranched polyester Boltorn produced by Perstorp, Sweden. TM H40, which contains 64 hydroxyl groups in the molecule, reacts with th...

Embodiment 1

[0046] Add 450g of hyperbranched polyester Boltorn in the reaction vessel TM H40 and 1300g xylene, the temperature is raised to 110°C, stirred for 20min, after heating to dissolve completely, add 0.23g of anhydrous stannous chloride catalyst and 0.01g of antioxidant 1010, then add 80g of maleic anhydride, and heat up to 145°C, react for 2 hours, remove xylene under 0.098MPa pressure, and obtain modified hyperbranched waterborne polyurethane;

[0047] Under the protection of nitrogen, add 350g modified hyperbranched water-based polyurethane to the reaction vessel, raise the temperature to 100°C, and remove water under reduced pressure for 2 hours under 0.098MPa pressure, then drop the temperature to 70°C, add 160g acetone, and 165g of 1,6-hexamethylene diisocyanate was added dropwise at a speed of min, and after the dropwise addition was completed, the reaction was continued for 2 hours to obtain the first intermediate;

[0048] Add 120ml of acetone to the reaction vessel to r...

Embodiment 2

[0051] In reaction vessel, add the hyperbranched polyester Boltorn of 820g TM H40 and 1650g xylene, the temperature is raised to 135°C, stirred for 35min, after heating to dissolve completely, add 0.55g anhydrous stannous chloride catalyst and 0.03g antioxidant 1010, then, add 170g maleic anhydride, heat up to 160°C, reacted for 3.5 hours, and removed xylene under a pressure of 0.098MPa to obtain a modified hyperbranched waterborne polyurethane;

[0052] Under the protection of nitrogen, add 672g of modified hyperbranched water-based polyurethane to the reaction vessel, raise the temperature to 120°C, and remove water under reduced pressure for 2 hours under the pressure of 0.098MPa, then drop the temperature to 85°C, add 240g of acetone, and Add 238g of dicyclohexylmethane diisocyanate dropwise at a speed of min, and after the dropwise addition, continue to react for 4 hours to obtain the first intermediate;

[0053] Add 200ml of acetone to the reaction vessel to reduce the ...

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Abstract

The invention provides a hyperbranched water-based polyurethane coating and a preparation method thereof, belongs to the field of water-based coating, and is used for solving the problem that the existing hyperbranched water-based polyurethane is poor in waterproofness, solvent resistance and weather fastness. The coating comprises 35-68 parts of hyperbranched water-based polyurethane, 0.3-0.9 part of water-based wetting agent, 0.2-0.7 part of water-based flatting agent, 0.5-1.1 parts of water-based deformaer, 8-12 parts of water-based cosolvent and 2.5-4.3 parts of curing agent. The hyperbranched water-based polyurethane is prepared with hyperbranched polyester BoltornTMH40 as a soft segment and diaminosulfonate as a hydrophilic chain extender. A film formed by the cured hyperbranched water-based polyurethane coating provided by the invention has no phenomena of blushing, bubbling and falling even after being soaked in normal-temperature water for 60 hours, and also has no phenomena of blushing, facing and dulling even after being wiped 200 times by using ethanol and acetone.

Description

technical field [0001] The invention belongs to the field of water-based paint, in particular to a hyperbranched water-based polyurethane paint and a preparation method thereof. technical background [0002] Hyperbranched waterborne polyurethane is widely used due to its environmental protection characteristics of waterborne polyurethane, good solubility and low melt viscosity of hyperbranched polymers. Waterborne polyurethane is divided into carboxylic acid type waterborne polyurethane and sulfonic acid type waterborne polyurethane. Compared with carboxylic acid type waterborne polyurethane, sulfonic acid type waterborne polyurethane has better stability and higher solid content. Jiang Li et al. (Polyurethane Industry, 2012, 27 (4): 39-42) reported a waterborne polyurethane with a solid content of 50%, and its core technology is 1,2-dihydroxy-3-propanesulfonate sodium As a hydrophilic chain extender, it reacts with isophorone diisocyanate and polyether polyol to prepare wa...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/12C08G18/66C08G18/42C08G18/32C08G18/10
Inventor 张振久高成勇蒋舰马海松张旭刘凯
Owner CHANGCHUN SANHUA IND
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