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Aqueous polyurethane, and preparation method and application thereof

A water-based polyurethane, reaction technology, applied in chemical instruments and methods, transportation and packaging, dissolution, etc., can solve problems such as use restrictions, "bridging" effect, etc., to achieve low surface tension, flocculation prevention, good wetting effect. Effect

Inactive Publication Date: 2014-04-16
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome many defects such as the sensitivity of the pH of the existing water-based wetting and dispersing agent, the use is limited, and the "bridging" effect is prone to occur, and a new water-based polyurethane, its preparation method and its Application in wetting and dispersing additives

Method used

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  • Aqueous polyurethane, and preparation method and application thereof
  • Aqueous polyurethane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Add 30g of diphenylmethane diisocyanate, 96g of methoxypolyoxyethylene ether (number-average molecular weight: 800) that has been vacuumed to remove water, 40g of 4A Acetone and 0.38 g of dibutyltin dilaurate were reacted at 45-50° C. for 0.5 h to obtain a polyurethane prepolymer. Among them, the water contents of methoxypolyoxyethylene ether (number average molecular weight: 800), acetone and dibutyltin dilaurate are 0.042%, 0.036% and 0.015%, respectively.

[0061] Add 5.36g of trimethylolpropane that was dewatered by vacuuming and 31g of acetone that was dewatered by 4A molecular sieves for one week to adjust the solid content in the system to 50% in the above polyurethane prepolymer. React under the condition of 50~60°C, and stop the reaction when NCO% = 0 to obtain the polyurethane containing solvent acetone. Among them, the water content of trimethylolpropane is 0.031%.

[0062] The acetone is distilled off the above-mentioned solvent-containing polyurethane und...

Embodiment 2

[0064] Add 27g of isophorone diisocyanate, 96g of allyl polyoxyethylene ether (number-average molecular weight: 800) that has been vacuumed to remove water, and 20g of 4A Ethyl acetate and 0.35 g of stannous octoate were dried with molecular sieves to remove water for one week, and reacted at 90-95°C for 2 hours to obtain a polyurethane prepolymer. Among them, the water contents of allyl polyoxyethylene ether (number-average molecular weight: 800), ethyl acetate and stannous octoate were 0.044%, 0.023% and 0.017%, respectively.

[0065] Add 5.94g of butanediol vacuumized to remove water and 12g of ethyl acetate dried with 4A molecular sieve to remove water for one week to the above polyurethane prepolymer to stabilize the solid content in the system to 80%. React under the condition of 55~65°C, stop the reaction when NCO%=0, and obtain the polyurethane containing solvent ethyl acetate. Among them, the water content of butanediol is 0.030%.

[0066] The above solvent-containi...

Embodiment 3

[0068] Add 35g of polymethylene polyphenylisocyanate and 144g of methallyl polyoxyethylene ether (number average molecular weight: 1200) to a four-necked flask equipped with tetrafluoro stirring, thermometer and condenser. 1. 80g of ethyl acetate and 0.35g of dibutyltin dilaurate were reacted at 50-55°C for 1.5h to obtain a polyurethane prepolymer. Among them, the water contents of methallyl polyoxyethylene ether (number average molecular weight: 1200), ethyl acetate and dibutyltin dilaurate are 0.041%, 0.023% and 0.015%, respectively.

[0069] Add 4.94g of propylene glycol dewatered by vacuuming and 43g of ethyl acetate dried over 4A molecular sieves for one week to the above polyester prepolymer to stabilize the solid content in the system to 60%. React under the condition of 50~55°C, and stop the reaction when NCO%=0, and obtain the polyurethane containing solvent ethyl acetate. Among them, the water content of propylene glycol is 0.027%.

[0070] The above solvent-contai...

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Abstract

The invention discloses aqueous polyurethane, and a preparation method and application thereof. The preparation method comprises: 1) dissolving isocyanate, polyethenoxy ether and a catalyst in a solvent, reacting at 45-95 DEG C for 0.5-3 h to obtain a polyurethane prepolymer, wherein isocyanate is diisocyanate and / or polyisocyanate, polyethenoxy ether is polyether with a single hydroxyl group, the catalyst is triethylenediamine, stannous octoate or dibutyltin dilaurate, and the solvent is one or more of acetone, ethyl acetate, toluene and cyclohexane; 2) reacting the polyurethane prepolymer with a compound containing two or more hydroxyl groups or amino groups, replenishing the solvent of the step 1) to a solid content of 50%-80%, and keeping the reaction until the content of isocyanate is zero, wherein the compound containing two or more hydroxyl groups or amino groups is one or more of a diol, a triol, a dihydric phenol and a diamine; and 3) removing the solvent. The aqueous polyurethane provided by the invention is low in surface tension and good in wetting performance; and after prepared, the aqueous polyurethane can be adsorbed by the surface of a pigment / filling material, helps to prevent the pigment / filling material from flocculating and helps the pigment / filling material to form a stable disperse system.

Description

technical field [0001] The invention relates to a waterborne polyurethane and its preparation method and application. Background technique [0002] The wetting and dispersing of pigments and fillers are two different stages in the dispersion and stabilization process. Wetting agents and dispersing agents are generally surfactants, and wetting agents generally have a small molecular weight. The air or moisture in the air or water reduces the surface tension between solid / liquid, which is beneficial to the wetting of the liquid on the surface of the pigment, so as to achieve the purpose of easy dispersion of the pigment; the dispersant generally has a large molecular weight, and its main function is to adsorb on the surface of the pigment and filler Generate charge repulsion or steric hindrance, prevent harmful flocculation of pigments and fillers, and keep the dispersion system in a stable state. Wetting is an important link in the dispersion process. Sometimes it is difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48B01F17/52C09K23/52
CPCC08G18/10C08G18/283C09K23/16
Inventor 张天水崔言云董建国王振波杜辉
Owner SHANGHAI DONGDA CHEM
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