Preparation method of secondary-post-chain-extension waterborne polyurethane and dispersing liquid prepared from waterborne polyurethane

A technology of water-based polyurethane and post-chain extension, which is applied in the field of polyurethane preparation, can solve problems such as the difficulty in fully improving the relative molecular weight of water-based polyurethane, and achieve improved water-based polyurethane product performance, large commercial application value, and improved tensile strength and elongation at break rate effect

Active Publication Date: 2017-08-25
HANGZHOU TRANSFAR FINE CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the post-chain extension reaction of water-soluble diamines is only limited to the hydrophilic surface of polyurethane latex particles, and has no effective chain extension effect on the isocyanate groups remaining in the lipophilic interior of polyurethane latex particles. The relative molecular mass of

Method used

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  • Preparation method of secondary-post-chain-extension waterborne polyurethane and dispersing liquid prepared from waterborne polyurethane
  • Preparation method of secondary-post-chain-extension waterborne polyurethane and dispersing liquid prepared from waterborne polyurethane
  • Preparation method of secondary-post-chain-extension waterborne polyurethane and dispersing liquid prepared from waterborne polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]With 100g (0.05 mole) the polycarbonate diol of relative molecular mass 2000, the polypropylene oxide diol of 110g (0.11 mole) relative molecular mass 1000, the polypropylene oxide diol of 5g (0.0017 mole) relative molecular mass 3000 and 100 g (0.1 mol) of polytetrahydrofuran diol with a relative molecular mass of 1000 was vacuum dehydrated at 120° C. for 1.5 h. Cool down to 65°C, add 159.5g (0.718 moles) of isophorone diisocyanate, and react under nitrogen protection at 80°C for 1 hour. Add 0.1 g of stannous octoate (0.000247 mol) and react at 80° C. for 1.5 h. Add 12g (0.081 mol) of 2,2-dimethylolbutyric acid, 6g (0.057 mol) of diethylene glycol, and 60g of butanone, and react at 80°C for 3 hours to obtain a clear and viscous prepolymer. Cool down to 50°C, add 9.0g of triethylamine for neutralization, disperse the prepolymer in 1134g of deionized water under high-speed stirring at 1000r / min, add 8.6g (0.143 moles) of ethylenediamine to extend the chain, and stir at h...

Embodiment 2

[0035] 100 g (0.2 mol) of polybutylene adipate with a relative molecular mass of 500 was vacuum dehydrated at 120° C. for 1 h. Cool down to 60°C, add 72g (0.414 moles) of toluene diisocyanate, and react under nitrogen protection at 80°C for 1 hour. Add 0.03g (0.0000475 moles) of dibutyltin dilaurate and react at 80°C for 1.5h. Add 4g (0.03 moles) of 2,2-dimethylolpropionic acid, 3g (0.03 moles) of neopentyl glycol, 5g of N-methylpyrrolidone, and 25g of methyl ethyl ketone, and react at 80°C for 3h to obtain a clear and viscous pre- Polymer. Cool down to 50°C, add 3.6g of triethylamine for neutralization, disperse the prepolymer in 104g of deionized water under high-speed stirring at 1000r / min, add 3.9g (0.045 moles) of piperazine and extend the chain, and stir at high speed for 0.5h , adding 5g (0.028 moles) of 3,5-diethyltoluenediamine for secondary chain extension, stirring at high speed for 1 h, and removing the solvent under reduced pressure to obtain an aqueous polyuret...

Embodiment 3

[0037] 200 g (0.1 mol) of polypropylene oxide diol with a relative molecular mass of 2000 was vacuum dehydrated at 120° C. for 1.5 h. Cool down to 65°C, add 76.4g (0.344mol) of isophorone diisocyanate, and react under nitrogen protection at 80°C for 1 hour. Add 0.06g (0.000148 moles) of stannous octoate and react at 80°C for 1.5h. Add 8g (0.06 moles) of 2,2-dimethylolpropionic acid, 5g (0.06 moles) of 1,4-butanediol, 10g of N-methylpyrrolidone, 40g of methyl ethyl ketone, and react at 80°C for 3h to obtain a clear viscous Thick prepolymer. Cool down to 50°C, add 7.2g of triethylamine for neutralization, disperse the prepolymer in 245g of deionized water under high-speed stirring at 1000r / min, add 3.0g (0.05 mole) of ethylenediamine to extend the chain, and stir at high speed for 0.5 h, add 5.2g (0.029 moles) of 3,5-diethyltoluenediamine for the second chain extension, stir at high speed for 1 h, remove the solvent under reduced pressure, and obtain the aqueous polyurethane d...

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Abstract

The invention discloses a preparation method of secondary-post-chain-extension waterborne polyurethane and a dispersing liquid prepared from waterborne polyurethane. According to the preparation method, the problems that the post-chain-extension reaction of water-soluble diamine is only limited on the hydrophilic surfaces of polyurethane emulsion particles at present, therefore, no effective chain extension is caused to oleophilic isocyanate groups remained in the polyurethane emulsion particles, and the relative molecular mass of waterborne polyurethane is difficult to be adequately increased are solved. The preparation method comprises the steps of reacting polymeric polylol with diisocyanate, a hydrophilic chain extender and a small molecule chain extender in the presence of a catalyst, adjusting the viscosity by virtue of a solvent so as to obtain a prepolymer, adding a neutralizer for neutralization, carrying out chain extension by virtue of a water-soluble chain extender, carrying out secondary post chain extension by virtue of an oil-soluble post chain extender, and decompressing to remove the solvent, so as to obtain the secondary-post-chain-extension waterborne polyurethane dispersing liquid. By virtue of a secondary-post-chain-extension method, the adequate reaction between the remained isocyanate groups of polyurethane and a post chain extender is realized, and the relative molecular mass of the waterborne polyurethane is rapidly and effectively increased.

Description

technical field [0001] The invention relates to the field of polyurethane preparation methods, more specifically to a preparation method for secondary chain-extended water-based polyurethane and a dispersion liquid prepared therefrom. Background technique [0002] With the improvement of people's quality of life and environmental protection requirements, various environmental protection regulations have strict restrictions on the emission of volatile organic compounds (VOC) and the content of toxic solvents. Water-based polyurethane is a water-dispersed polymer that uses water as the dispersion medium and contains no or only a small amount of organic solvents. It has the advantages of non-toxic, non-flammable, non-polluting, energy-saving, safe and reliable. As a substitute for solvent-based polyurethane materials, water-based polyurethane materials not only have good comprehensive properties, but also have the advantages of no pollution, safe transportation and good working...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/66C08G18/12C08G18/08
Inventor 熊露王小君余冬梅陈八斤王胜鹏
Owner HANGZHOU TRANSFAR FINE CHEM CO LTD
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