Continuous synthesis method and device of solvent-free waterborne polyurethane

A technology of water-based polyurethane and synthesis method, which is applied in the field of continuous synthesis method and device of solvent-free water-based polyurethane, which can solve the problems of poor product stability, low solid content of polyurethane dispersion, poor compatibility, etc., and achieve high stability Effect

Inactive Publication Date: 2019-12-31
HANGZHOU TRANSFAR FINE CHEM CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this continuous process, triethylamine is first dispersed into water, that is, the neutralization of the prepolymer is carried out simultaneously with water dispersion, and the mixing of the prepolymer and triethylamine is insufficient due to the poor compatibility of triethylamine and water. As a result, the degree of ionization of the carboxyl groups on the prepolymer is not high, and more water needs to be added to undergo phase transition. Therefore, the polyurethane dispersion obtained by this continuous synthesis process has low solid content and poor product stability.

Method used

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  • Continuous synthesis method and device of solvent-free waterborne polyurethane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 5kg of polyethylene oxide diol with a relative molecular mass of 2000, 5kg of polypropylene oxide diol with a relative molecular mass of 2000, 10.8kg of isophorone diisocyanate, 2.3kg of 1,4-butanediol and 120g of stannous octoate , and reacted at 80°C for 5h to obtain a clear solvent-free polyurethane prepolymer.

[0032] The above-mentioned polyurethane prepolymer is delivered to the emulsifier by the first metering pump from the prepolymer tank at a flow rate of 10kg / h, and at the same time, deionized water is delivered to the emulsifier by the second metering pump at a flow rate of 10L / h. The emulsifier performs strong dispersion and emulsification at a speed of 4000rpm, and the obtained polyurethane dispersion is sent to a static mixer with an aspect ratio of 60. At the same time, 40% of N-(2-aminoethyl)- The aqueous solution of sodium 2-aminoethanesulfonate is delivered to the static mixer by the third metering pump at a flow rate of 1.5 L / h, and through the effic...

Embodiment 2

[0034] With the polyneopentyl glycol adipate of 3kg relative molecular mass 1000, the polytetrahydrofuran diol of 3kg relative molecular mass 1000, 8.9kg toluene diisocyanate, 1kg ethylene glycol, 1.5kg neopentyl glycol and 40g stannous octoate, React at 85°C for 5h to obtain a clear solvent-free polyurethane prepolymer.

[0035] The above-mentioned polyurethane prepolymer is delivered to the emulsifier by the first metering pump from the prepolymer tank with a flow rate of 5kg / h. At the same time, deionized water is delivered to the emulsifier by the second metering pump at a flow rate of 8L / h. The emulsifier performs strong dispersion and emulsification at a speed of 5000rpm, and the obtained polyurethane dispersion is sent to a static mixer with an aspect ratio of 40. At the same time, the mass fraction of 50% N-(2-aminoethyl)- The aqueous solution of sodium 3-aminoethanesulfonate was delivered to the static mixer by the third metering pump at a flow rate of 1.2 L / h, and th...

Embodiment 3

[0037] 6kg of polybutylene adipate with a relative molecular mass of 3000, 2kg of polybutylene adipate with a relative molecular mass of 1000, 10.52kg of hydrogenated phenylmethane diisocyanate, 2kg of 1,4-butanediol, 0.5kg Diethylene glycol and 50g of dibutyltin dilaurate were reacted at 90°C for 4 hours to obtain a clear solvent-free polyurethane prepolymer.

[0038] The above-mentioned polyurethane prepolymer is delivered to the emulsifier by the first metering pump from the prepolymer tank with a flow rate of 15kg / h. At the same time, deionized water is delivered to the emulsifier by the second metering pump at a flow rate of 10L / h. The emulsifier performs strong dispersion and emulsification at a speed of 6000rpm, and the obtained polyurethane dispersion is sent to a static mixer with an aspect ratio of 80. At the same time, 30% of N-(3-aminoethyl)- The aqueous solution of sodium 2-aminoethanesulfonate was transported into the static mixer by the third metering pump at a ...

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Abstract

The invention discloses a continuous synthesis method and device of solvent-free waterborne polyurethane. According to a technical scheme in the invention, the synthesis method comprises the followingsteps: quantitatively conveying a solvent-free polyurethane prepolymer with a terminal isocyanate group through a single-screw pump, subjecting the solvent-free polyurethane prepolymer and deionizedwater to violent dispersing and emulsifying in an emulsifying machine to form emulsion particles, and subjecting the amino groups of a water-soluble hydrophilic chain extender diamido sulfonate and the isocyanate groups on the surfaces of the emulsion particles to a sufficient chain extension reaction in a static mixer so as to forcibly disperse hydrophilic groups on the surfaces of the emulsion particles. According to the invention, quantitative conveying of the high-viscosity solvent-free polyurethane prepolymer can be achieved, and organic solvents such as acetone and butanone do not need to be added to reduce the viscosity of the prepolymer; the static mixer provides a mixing place for the emulsion particle and the water-soluble hydrophilic chain extender and the sufficient chain extension reaction is performed, so the emulsion particle formed by violent dispersion and emulsification are low in viscosity and not easy to block a pipeline, which facilitates the continuous synthesis of waterborne polyurethane.

Description

technical field [0001] The invention relates to the field of polyurethane dispersion preparation, in particular to a continuous synthesis method and device for solvent-free waterborne polyurethane. Background technique [0002] In recent years, with the rapid development of industry, the problem of environmental pollution has attracted widespread attention, and countries around the world are taking measures to limit the emission of volatile organic compounds (VOC). In order to comply with this development trend, water-based materials have become an extremely active research and development field, and water-based materials are one of the best ways to reduce VOC. Waterborne polyurethane has excellent comprehensive properties and is environmentally friendly, so its application scope involves many fields such as coatings, leather, paper, textiles, plastics, and rubber. In the 21st century, the application field has been continuously expanded, especially the increasing environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/38C08G18/42C08G18/50
CPCC08G18/3206C08G18/3855C08G18/4018C08G18/4202C08G18/4238C08G18/4808C08G18/482C08G18/4825C08G18/4833C08G18/4854C08G18/5072C08G18/6607C08G18/6618C08G18/664C08G18/6651C08G18/6674C08G18/6685
Inventor 熊露王小君王胜鹏田世哲余冬梅储昭华裘俊峰
Owner HANGZHOU TRANSFAR FINE CHEM CO LTD
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