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Comb-shaped multi-branched water-based polyurethane dispersion as well as preparation and application thereof

A water-based polyurethane, multi-branched technology, used in polyurea/polyurethane coatings, coatings, etc., can solve problems such as effect discounts

Active Publication Date: 2018-08-31
优美特(北京)环境材料科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the compounding of different performance emulsions and the adjustment of post-formulation additives, although part of the performance of the present invention can be realized to a certain extent, the effect may be discounted

Method used

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  • Comb-shaped multi-branched water-based polyurethane dispersion as well as preparation and application thereof
  • Comb-shaped multi-branched water-based polyurethane dispersion as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Add 1g of trimethylolpropane and 1.5g of pentaerythritol (molar ratio 1:2) into 12g of isophorone diisocyanate (IPDI) dropwise, and stir at 80°C for 30 minutes; continue adding 9.2g of polytetrahydrofuran ether polyol ( Molecular weight 1000) was added dropwise to the above-mentioned reactants, stirred and reacted at 90°C for 30min; , double-terminated hydroxyl polymer content accounted for 30%) were added to the above reactants at intervals of 3:1 titration rate, while adding the initiator dibutyltin dilaurate accounting for 1‰ of the total reactants, stirring at 95 ° C Reaction 60min.

[0036] 50g polycarbonate dibasic alcohol (number-average molecular weight 1000) and 13.2g isophorone diisocyanate (IPDI) and above-mentioned reactant are joined in the drying reactor equipped with stirrer, temperature measuring instrument together, at 70 The reaction was stirred at °C for 2 hours. Subsequently, 2 g of dimethylolpropionic acid, 0.5 g of 1,4-butanediol and 0.1 g of dibu...

Embodiment 2

[0038] Add 3g of trimethylolpropane dropwise into 12g of isophorone diisocyanate (IPDI), stir and react at 80°C for 30 minutes; continue to add 9.2g of polytetrahydrofuran ether polyol (molecular weight 1000) dropwise into the above reactant, 90°C Stirring and reacting for 30 minutes; then 3g hydroxyl-terminated siloxane (molecular weight 600, double-terminated hydroxyl polymer content accounts for 30%) and 1g hydroxyl-terminated polyethylene glycol (molecular weight 500, double-terminal hydroxyl polymer content accounts for 50%) respectively Add the above-mentioned reactants at intervals of a titration rate of 1:3, and at the same time add the initiator dibutyltin dilaurate accounting for 1‰ of the total reactants, and stir and react at 95°C for 60 minutes.

[0039] 50g polyethylene oxide glycol (number-average molecular weight 2000) and 20g hexamethylene diisocyanate and 18g isophorone diisocyanate are added in the drying reactor equipped with stirrer, temperature measuring i...

Embodiment 1 and 2

[0049] The aqueous dispersion prepared in the embodiment of the present invention 1 and 2 and curing agent ( XP2655, purchased from Covestro Polymers (China) Co., Ltd.) in a disperser (FLUKO FA25 type, purchased from Fluke Fluid Machinery Manufacturing Co., Ltd.) at 16000rpm to mix and disperse evenly, add a wetting agent (model YMT 245 , purchased from Umitech (Beijing) Environmental Materials Technology Co., Ltd.) and adjusted the viscosity. After the viscosity was adjusted to 800mPa·s, the mixed solution was directly coated on the matting release paper and PVC leather ( Polyvinyl chloride artificial leather), fully dried in a blast oven at 90 and 120 °C, respectively.

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Abstract

The invention discloses a comb-shaped multi-branched water-based polyurethane dispersion as well as preparation and application thereof. A preparation method comprises the following steps: 1) reactinga trifunctional or tetrafunctional polyhydroxy compound with isocyanate having an equal mole number as functional groups of the polyhydroxy compound by adopting a drop-wise adding method to form a product having a polyisocyanate functional group; 2) adding a polyol raw material dropwise and gradually into the product obtained in the step 1), wherein a molar ratio of a polyol to the obtained product is 1:2 to 1:1; 3) reacting the product obtained in the step 2) with a silane chain having a terminal hydroxyl group, wherein a mole number of the silane chain is 0.25-0.5 of a mole number of a product functional group; 4) reacting the product obtained in the step 3) with a hydrocarbon chain having a terminal hydroxyl group, wherein a mole number of the hydrocarbon chain is 0.33-0.5 of a mole number of a product functional group; and 5) further reacting the product obtained in the step 4) with isocyanate, a polyol and a chain extender to obtain the stable comb-shaped multi-branched water-based polyurethane dispersion.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and in particular relates to a comb-like multi-branched aqueous polyurethane dispersion and its preparation and application. Background technique [0002] The existing water-based polyurethane synthetic products with a comb structure all use a diol compound with a long branched chain to increase the branched chain structure, and the amount of addition is limited and the distribution is random. There is an impact on performance improvement, but to a limited extent. For example, Han Xixi and other articles "Synthesis and Properties of Long Comb Waterborne Polyurethane", China Leather, 2016, 45, 6; 70-74) (US2017240756A1-COMB POLYURETHANE DISPERSANTS). The PUA method is also used to prepare comb-shaped water-based polymers (WO2012130762A1-AQUEOUS POLYURETHANE ACRYLATE DISPERSIONS WITH ACOMB-LIKE STRUCTURE OF THE POLYMER), but the preparation process is complicated, and a large amount of s...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/61C08G18/48C08G18/44C08G18/34C08G18/32C09D175/04
CPCC08G18/4018C08G18/44C08G18/4804C08G18/4833C08G18/4854C08G18/61C08G18/6607C08G18/6611C08G18/6618C08G18/6625C09D175/04
Inventor 张建森张冬海罗楠郝伟
Owner 优美特(北京)环境材料科技股份公司
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