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A method of extracting in a water-based polyurethane producing process to remove a solvent

A water-based polyurethane and production process technology, applied in the field of solvent removal in the production process of water-based polyurethane, can solve the problems of high energy consumption, affecting product quality, energy consumption, etc., and achieve the effect of simple operation and convenient industrial implementation

Active Publication Date: 2016-08-10
SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned desolvation process known in the industry, the polymerization solvent produced by distillation directly enters the condenser for condensation to obtain a polymerization solvent solution containing a large amount of water. The process of removing the polymerization solvent needs to evaporate all the added solvent. Due to the huge latent heat of vaporization , the desolventization process is the most energy-consuming step in the production of water-based polyurethane; on the other hand, the polymerization solvent produced by desolventization contains a large amount of water, which needs to be refined by rectification, and this process also consumes a lot of energy.
[0005] In the well-known desolventization process in the industry, the polyurethane emulsion needs to be heated, which will lead to poor emulsion stability and affect product quality
For polyurethane emulsions with poor temperature tolerance, it is necessary to reduce the desolvation temperature by means of increasing the vacuum degree, which will also lead to high energy consumption, and there is also a hidden danger of over-temperature waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Components and content of non-desolvated polyurethane emulsion: (weight)

[0033] Polyurethane 0.1%, solvent 0.1%, water 99.8%;

[0034] The solvent is acetone; the extractant is n-pentane;

[0035] Cool the undesolvated polyurethane emulsion to 0°C, and pass it through the upper part of a rotating disk extraction tower at a rate of 10 kg / min. The lower part is passed through, the temperature of the extraction tower is also maintained at 0 ° C, the residence time of the undesolvated polyurethane emulsion is 0.5 minutes, the raffinate phase is collected from the bottom of the rotary tower, the extraction phase is collected from the top of the rotary tower, and the extraction percentage of the polymerization solvent More than 99%, the residual amount of polymerization solvent in the waterborne polyurethane is less than 1%.

Embodiment 2

[0037] Components and content of non-desolvated polyurethane emulsion: (weight)

[0038] Polyurethane 0.1%, solvent 59.9%, water 40%;

[0039] The solvent is butanone; the extractant is a mixture of n-tridecane and n-octadecene, and the weight ratio is 1:99;

[0040] Cool the undesolvated polyurethane emulsion to 50°C, pass it through the upper part of a rotary extraction tower at a rate of 10 kg / min, raise the temperature of the extractant to 50°C, and pass it through the lower part of the rotating disc tower at a rate of 1000 kg / min In, the extraction tower temperature is maintained at 50 DEG C equally, and the residence time of the polyurethane emulsion without desolvation is 30 minutes;

[0041] The raffinate phase is collected from the bottom of the turntable tower, the extract phase is collected from the top of the turntable tower, the extraction percentage of the polymerization solvent is greater than 99.9%, and the residual amount of the polymerization solvent in the ...

Embodiment 3

[0043] Components and content of non-desolvated polyurethane emulsion: (weight)

[0044] Polyurethane 59.9%, solvent 0.1%, water 40%;

[0045] The solvent is N,N-dimethylformamide; the extractant is a mixture of n-hexadecane and 4-vinyl-4-hepten-2-yne, and the weight ratio is 99:1;

[0046] Raise the temperature of the non-desolvated polyurethane emulsion to 50°C, and pass it through the upper part of a rotary extraction tower at a rate of 10 kg / min, and raise the temperature of the extractant to 50°C, and pass it through the lower part of the rotating disc tower at a rate of 1000 kg / min. Into, the extraction tower temperature remains on 50 ℃ equally, and the residence time of the emulsion that does not desolventize is 30 minutes, and other is with embodiment 1;

[0047] The extraction percentage of the polymerization solvent is greater than 99.5%, and the residual amount of the polymerization solvent in the waterborne polyurethane is lower than 0.03%.

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Abstract

A method of extracting in a water-based polyurethane producing process to remove a solvent is disclosed. The method includes bringing an extractant and a polyurethane emulsion a solvent of which is not removed into contact, and collecting an extract phase and a raffinate phase separately, and therefore a polyurethane emulsion the solvent of which is removed can be obtained. The extractant comprises C5-C30 n-alkanes or isoparaffins, C5-C30 n-alkenes or isoalkenes or polyene hydrocarbons, C5-C30 n-alkynes or isoalkenes or polyacetylene, C5-C30 n-eneynes or iso-eneynes, or a composition of the abovementioned compounds. The extraction percentage of the polymerization solvent is higher than 99%. The residual amount of the polymerization solvent in the water-based polyurethane is less than 1%. The method overcomes a defect that solvent-removing steps in water-based polyurethane production processes are high in energy consumption and unstable in product quality, and is convenient for industrial implementation.

Description

technical field [0001] The invention relates to a method for removing solvent in the production process of waterborne polyurethane. technical background [0002] Waterborne polyurethane is an environmentally friendly polyurethane product formed by dispersing polyurethane in water through certain technical means. It is mainly used in many fields such as adhesives, coatings, and synthetic leather. Compared with oily polyurethane system, water-based polyurethane does not contain solvent, or contains a very small amount of solvent, which is a typical environmental protection product. In the production process of waterborne polyurethane, in order to make the prepolymerization reaction go smoothly, and to disperse the prepolymer in water smoothly during the emulsification process, it is usually necessary to add acetone, methyl ethyl ketone, N,N-di Polymerization solvents such as methylformamide to reduce viscosity. After adding water to the prepolymer to emulsify, it is necessar...

Claims

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Application Information

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IPC IPC(8): C08G18/82
CPCC08G18/82
Inventor 尚玥蒋红梅马宁潘利军唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD