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Method for preparing high solid content aqueous polyurethane emulsion by continuous process

A technology of water-based polyurethane and polyurethane emulsion, which is applied in the field of high-solid content and low-viscosity sulfonic acid-type anionic water-based polyurethane emulsion, can solve the problems of low solid content of water-based polyurethane emulsion products, and achieve good heat resistance and high initial bonding strength Effect

Inactive Publication Date: 2008-12-24
ANHUI UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Select suitable raw materials, use better methods, find the best conditions for the reaction, prepare water-based polyurethane emulsion with high solid content, and solve the problem of low solid content of water-based polyurethane emulsion products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0059] Under the protection of dry nitrogen, 58g of polyoxypropylene diol (N-210) after vacuum dehydration, 30g of isophorone isocyanate (IPDI), 3.7g of diethylene glycol (DEG); appropriate amount of solvent and catalyst two Add dibutyltin laurate (T-12) and stannous octoate (T-9) into the reactor at one time, and control a certain temperature under mechanical stirring to carry out the reaction. When the NCO content remains unchanged, lower the system temperature to 20°C to 50°C, slowly add an appropriate amount of sulfonate hydrophilic chain extender 2.0g to the prepolymer, and add an appropriate amount of solvent to prevent coagulation caused by excessive viscosity. After the reaction until the NCO content does not change, the system is cooled to room temperature, and then a metered amount of water is added under high shear force for emulsification to obtain a milky white opaque water-based polyurethane emulsion. The obtained water-based polyurethane emulsion was desolvated ...

example 2

[0061] Under the protection of dry nitrogen, polyoxypropylene diol (N-220) 116g after vacuum dehydration, isophorone isocyanate (IPDI) 30g, diethylene glycol (DEG) 3.0g, appropriate amount of solvent and catalyst two Add dibutyltin laurate (T-12) and stannous octoate (T-9) into the reactor at one time, and control a certain temperature under mechanical stirring to carry out the reaction. When the NCO content remains unchanged, lower the temperature of the system to 20°C to 50°C, slowly add an appropriate amount of sulfonate hydrophilic chain extender 2.6g to the prepolymer, and add an appropriate amount of solvent to prevent coagulation caused by excessive viscosity. After the reaction until the NCO content does not change, the system is cooled to room temperature, and then a metered amount of water is added under high shear force for emulsification to obtain a milky white opaque water-based polyurethane emulsion. The obtained water-based polyurethane emulsion was desolvated b...

example 3

[0063] Under the protection of dry nitrogen, 58g of polyethylene adipate (PHA) with a hydroxyl value of 1.96mmol / g after vacuum dehydration, 30g of isophorone isocyanate (IPDI), diethylene glycol (DEG) ) 3.7g, an appropriate amount of solvent and catalyst dibutyltin dilaurate (T-12) and stannous octoate (T-9) are added to the reactor at one time, and the reaction is carried out at a controlled temperature of 100-105°C under mechanical stirring. When the reaction reaches a certain NCO content, lower the system temperature to 20°C-50°C, slowly add an appropriate amount of sulfonate hydrophilic chain extender 2.0g to the prepolymer, and add an appropriate amount of solvent to prevent gelation caused by excessive viscosity , after the reaction until the NCO content no longer changes, the system is cooled to room temperature, and then a metered amount of water is added under high shear force for emulsification to obtain a milky white opaque water-based polyurethane emulsion. The ob...

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Abstract

The invention provides a method for preparing water-borne polyurethane emulsion with high solid content by the continuous method. The method comprises the following steps that: oligomer polylol after vacuum dehydration, isocyanate, a chain extender, a solvent and a catalyst are added into a reactor at a time under the protection of dry nitrogen; the mixture is mechanically stirred and simultaneously controlled at a certain temperature for reaction to a certain degree; the system temperature is reduced to between 20 and 50 DEG C; the hydrophilic chain extender is slowly dripped into a prepolymer which is then added with the solvent so as to prevent gel coagulation caused by overlarge viscosity; the isocyanate-based NCO content in the prepolymer which is generated through reaction is not changed again; and the prepolymer is added with water again to perform emulsion dispersion and undergoes vacuum distillation to remove the solvent, and then the water-borne polyurethane solution is prepared. The water-borne polyurethane solution prepared by the method has high solid content, low viscosity, large initial bonding strength, and good heat resistance, can be used as textile fabric coating agent, shoe coating agent, leather finishing agent, and adhesives used in the fields of wood, architecture, automobile, paper-making, electronics and so on.

Description

technical field [0001] The invention relates to a preparation method of a polymer material, in particular to a continuous method for preparing a high-solid-content, low-viscosity sulfonic acid anionic water-based polyurethane emulsion with high film-forming speed, high initial bonding strength and certain heat resistance . Background technique [0002] Polyurethane refers to polyurethane (PU), which is a general term for polymers containing repeated carbamate groups [NHCOO-] in the molecular structure. Waterborne polyurethane is relative to solvent-based polyurethane. It is a binary colloid system in which polyurethane particles are dispersed in the continuous phase (water). Like ordinary polyurethane, it belongs to (AB)n type block polymer. It was successfully prepared for the first time in 1943 by West German P. Schlack. In 1967, polyurethane emulsion was industrialized for the first time and came out in the US market. In 1972, Bayer Company took the lead in using polyur...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/30C08G18/38C08G18/32
Inventor 许戈文熊潜生周海峰王彤
Owner ANHUI UNIVERSITY
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