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A kind of hydroxyl-containing polyurethane aqueous dispersion and its preparation method and application

A polyurethane water dispersion and polyurethane technology, applied in polyurea/polyurethane coatings, coatings, primers, etc., can solve the problems of no oxidative crosslinking effect, poor paint film sandability, slow drying speed, etc.

Active Publication Date: 2020-04-10
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1278539A provides a kind of hydroxy polyurethane aqueous dispersion, obtained a kind of highly branched hydroxy polyurethane dispersion by end-capping, the coating with its preparation has high hardness and resistance, but sandability is poor, can only be used for making topcoat , not suitable for wood primer
[0006] CN1557892A uses a hydroxyacrylic emulsion and isocyanate curing agent to prepare the coating, which has the characteristics of high hardness and good resistance, but has the problems of slow drying speed and poor sanding performance, and cannot realize rapid recoating
[0007] CN102633979A introduces the alkyd resin prepared from vegetable oleic acid and polyol as chain extender into the polyurethane system to obtain a polyurethane dispersion with high wettability and self-drying performance. poor
[0008] CN101437863A adopts ricinoleic acid as the component of synthesizing polyester, and the prepared polyurethane polyol is used for the synthesis of polyurethane wood lacquer, introduces the hydroxyl group that can post-crosslink at the same time, the two-component coating that prepares thus improves when applying in woodware The substrate wettability and chemical resistance of the paint film are improved. Due to the low content of double bonds in the ricinoleic acid used, there is basically no oxidative cross-linking effect in the later stage, and the drying speed is slow
[0009] The coating prepared by the polyurethane dispersion in the prior art has a lower glass transition temperature, low drying speed and poor sandability, and a more excellent polyurethane dispersion is required

Method used

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  • A kind of hydroxyl-containing polyurethane aqueous dispersion and its preparation method and application
  • A kind of hydroxyl-containing polyurethane aqueous dispersion and its preparation method and application
  • A kind of hydroxyl-containing polyurethane aqueous dispersion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Add 80g of dehydrated vegetable oil modified polyol 1, 1.8g of dehydrated Ymer N-120, 50g of WANOL R2307, 93g of TDI, 28.05g of HMDI, and 38g of acetone into a 1L four-neck round-bottomed flask equipped with a nitrogen inlet and outlet, The mixture was stirred at 80-90°C until NCO reached 9.28 wt%. Cool down and add 16g of 1,6-hexanediol, 8.0g of dimethylolpropionic acid and 50g of acetone, raise the temperature to 70°C and continue the reaction until the NCO reaches 2.92wt%. Lower the temperature and add 33.8g of trimethylolpropane and 96g of acetone, raise the temperature to 60°C and stir to continue the reaction until the NCO is lower than 0.1wt%, add 187g of acetone to dilute, and add 6.8g of triethylamine to neutralize for about 5min, then add 629g of water to the The mixture dispersed. After separation of acetone by distillation, a solvent-free aqueous dispersion of hydroxyl-containing polyurethane was obtained, which had a solids content of 35% by weight, an OH ...

Embodiment 2

[0094] Add 50g of dehydrated poly-1,6-hexanediol phthalate diol 1, 120g of dehydrated vegetable oil modified polyol, 88g of TDI, 28.05g of HMDI, 30g of WANOL R2307, 47g of acetone into a In a 1L four-neck round bottom flask with nitrogen inlet and outlet, the mixture was stirred at 80-90°C until NCO reached 4.78wt%. Cool down and add 10.0 g of dimethylolpropionic acid and 20 g of acetone, raise the temperature to 70° C. and stir to continue the reaction until the NCO reaches 2.82 wt%. Lower the temperature and add 33.5g trimethylolpropane and 106.4g acetone, heat up to 60°C and stir to continue the reaction until the NCO is lower than 0.1wt%, add 260g acetone to dilute, and add 6.8g triethylamine to neutralize for about 5min, then add 701g water to The mixture dispersed. After separation of acetone by distillation, a solvent-free aqueous dispersion of hydroxyl-containing polyurethane was obtained, which had a solids content of 35% by weight, an OH content of 2.5% by weight (b...

Embodiment 3

[0096] Add 120g of dehydrated vegetable oil-modified polyol 1, 90g of TDI, 19g of HMDI, 54g of WANOL R2307, and 42g of acetone into a 1L four-necked round-bottomed flask equipped with a nitrogen inlet and outlet, and stir the mixture at 80-90°C until the NCO reaches 4.06 wt%. Cool down and add 8g of dimethylolpropionic acid and 16g of acetone, raise the temperature to 70°C and stir to continue the reaction until the NCO reaches 2.35wt%. Cool down and add 26.2g of trimethylolpropane and 78.6g of acetone, heat up to 60°C and stir to continue the reaction until the NCO is lower than 0.1wt%, add 243g of acetone to dilute, and add 5.44g of triethylamine to neutralize for about 5min, then add 644g of water to The mixture dispersed. After separation of acetone by distillation, a solvent-free aqueous dispersion of hydroxyl-containing polyurethane was obtained with a solids content of 35% by weight, an OH content of 2.1% by weight (based on solids) in the dispersed phase by means of a...

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Abstract

The invention relates to a polyurethane aqueous dispersion containing a hydroxy group as well as a preparation method and application of the polyurethane aqueous dispersion. The polyurethane aqueous dispersion containing the hydroxyl group contains long-carbon-fatty-chain vegetable oil modified polyol, polyether triol and other polyol components. By virtue of reaction between the polyurethane aqueous dispersion and an isocyanate curing agent, quick film formation can be realized, and a formed film has excellent water resistance, chemical resistance, film formation property, glossiness, flexibility and sanding property as well as quick surface drying property.

Description

technical field [0001] The invention relates to a water-based polyurethane dispersion, in particular to a hydroxyl-containing polyurethane water dispersion and its preparation method and application. [0002] technical background [0003] Polyurethane has the advantages of high strength, good wear resistance, strong adhesion, and good chemical resistance, and is widely used in coatings, adhesives, and other fields. Water-based polyurethane uses water as a solvent, has the characteristics of non-toxic and low VOC, and is an important branch of water-based coatings. [0004] Due to the limitation of the synthesis method, the one-component water-based polyurethane has the characteristics of low molecular weight and poor water and chemical resistance compared with solvent-based polyurethane, which cannot meet the requirements in some fields. Two-component water-based polyurethane coatings use hydroxyl-containing components to react with isocyanate curing agents to obtain greater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/44C08G18/36C08G18/32C08G18/34C09D175/08C09D5/00
CPCC08G18/3206C08G18/348C08G18/36C08G18/4018C08G18/4211C08G18/44C08G18/48C08G18/4804C08G18/6629C08G18/6696C09D5/002C09D175/08
Inventor 王震朱文辉纪学顺林争超
Owner WANHUA CHEM GRP CO LTD
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