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Double-screw reactor design based continuous production process of aqueous polyurethane dispersion

A twin-screw reactor, water-based polyurethane technology, which is applied in the field of new chemical materials, can solve the problems of long production cycle, low equipment use efficiency, and cannot be reused, and achieves the effect of short production cycle and automatic control.

Inactive Publication Date: 2012-08-15
王武生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it increases the complexity of the production process, on the other hand, the production process of a green product is not green
Recovered solvents contain moisture or other chemical substances, and generally cannot be reused, resulting in a significant increase in production costs
In the production cost of waterborne polyurethane by acetone method, the solvent cost may be as high as 30-40% of the production cost
[0006]2) Long production cycle and low equipment efficiency
Batch process and semi-continuous process production cycle up to 4 to 10 hours
[0007]3) Low degree of production automation
[0008] Twin-screw reactors are widely used in the production of polyurethane heat-shrinkable elastomers, but there are no research reports on the synthesis of waterborne polyurethane prepolymers

Method used

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  • Double-screw reactor design based continuous production process of aqueous polyurethane dispersion
  • Double-screw reactor design based continuous production process of aqueous polyurethane dispersion

Examples

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Effect test

example 1

[0035] 500 parts of polytetrahydrofuran diol (Mn=2000), 60 parts of 2-methyl 1,3 propanediol, 248 parts of isophorone diisocyanate (IPDI), 55 parts of dimethylol propionic acid (DMPA), mixed and preheated to 70 DEG C are injected twin-screw reactor, twin-screw reactor temperature is controlled at 220 DEG C, and extrusion time is controlled at 10 minutes. After the prepolymer is extruded from the extruder, it is directly extruded into the primary disperser, and the metered triethylamine aqueous solution is injected into the primary disperser simultaneously, and the temperature of the injected triethylamine aqueous solution is controlled at 90°C. The primary disperser adopts mechanical dispersion, the dispersion temperature is controlled at 130°C, and the pressure is controlled at 0.3MPa. The primary dispersion liquid enters the secondary disperser, and the secondary disperser adopts ultrasonic dispersion, and the temperature and pressure are the same as the primary disperser. T...

example 2

[0037]Polytetrahydrofuran diol (Mn=2000) 500 parts, 2-methyl 1,3 propanediol 60 parts, isophorone diisocyanate (IPDI) 248 parts, dimethylol propionic acid (DMPA) 55 parts, N-formaldehyde 50 minutes of pyrrolidone, 40 minutes of triethylamine were mixed and injected into the twin-screw reactor, and the temperature of the twin-screw reactor was controlled at 140° C., and the extrusion time was controlled at 10 minutes. After the prepolymer is extruded from the extruder, it is directly extruded into the primary disperser, and the metered temperature of 90°C distilled water is injected into the primary disperser at the same time. The primary disperser adopts mechanical dispersion, the dispersion temperature is controlled at 100°C, and the pressure is controlled at 0.1MPa. The primary dispersion liquid enters the secondary disperser, and the secondary disperser adopts ultrasonic dispersion, and the temperature and pressure are the same as the primary disperser. The dispersion throu...

example 3

[0039] Polytetrahydrofuran diol (Mn=2000) 500 parts, 2-methyl 1,3 propanediol 50 parts, toluene diisocyanate (TDI) 170 parts, N-methyldiethanolamine 30 parts, N-methylpyrrolidone 50 parts, bis The temperature of the screw reactor was controlled at 120° C., and the extrusion time was controlled at 15 minutes. After the prepolymer is extruded from the extruder, it is directly extruded into the first-level disperser, and the metered temperature is injected into the first-level disperser at the same time as an aqueous formic acid solution with a temperature of 90°C. The primary disperser adopts mechanical dispersion, the dispersion temperature is controlled at 100°C, and the pressure is controlled at 0.1MPa. The primary dispersion liquid enters the secondary disperser, and the secondary disperser adopts ultrasonic dispersion, and the temperature and pressure are the same as the primary disperser. The dispersion through the secondary disperser enters the pipeline cooler, is cooled ...

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Abstract

The invention discloses a double-screw reactor design based continuous production process of aqueous polyurethane dispersion, comprising the steps of mixing aqueous polyurethane synthetizing raw materials, injecting the aqueous polyurethane synthetizing raw materials into a double-screw reactor, polymerizing for 3-15min at a temperature of 120-200 DEG C in the double-screw reactor, squeezing the polymerized polyurethane prepolymer out via the double-screw reactor, squeezing the polymerized polyurethane prepolymer into two pressure mixers connected in series, mixing the polymerized polyurethane prepolymer with water at a temperature of 90-150 DEG C, cooling and decompressing the reactant to obtain the aqueous polyurethane dispersion, wherein mechanical dispersion or ultrasonic dispersion can be adopted by the mixers. The production process disclosed by the invention has the advantages that: no solvent or few organic solvent can be used in the process; the production cycle is very short: the process from entering a continuous production device of the raw materials to obtaining products only takes 3-15min; and the fully automatic control on the process is realized.

Description

technical field [0001] The invention belongs to the field of new chemical materials, and in particular relates to a continuous production process of water-based polyurethane dispersion based on twin-screw reactor design. Background technique [0002] Water-based polyurethane dispersion uses water as the dispersion medium, and only water volatilizes into the atmosphere during use, which has no adverse effects on the environment. At the same time, using water as the dispersion medium makes the water-based polyurethane dispersion also have the characteristics of non-toxic, odorless, non-flammable, non-explosive and safe. Water-based polyurethane dispersion is widely used as a green and environmentally friendly polymer material. It can replace traditional solvent-based polyurethane materials for leather finishing, clean process preparation of synthetic leather, paper sizing, textile coating finishing, textile paint printing and glue, Wood coatings, metal coatings, plastic coati...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08J3/03B29C47/38B29C47/92B29C48/395B29C48/92
CPCB29C47/1063B29C47/0004B29C48/022B29C48/29B29C48/40B29C48/92B29C2948/92514B29C2948/92704B29C2948/92895B29C2948/92923
Inventor 王武生
Owner 王武生
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