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Preparation method for modified polyurethane

A water-based polyurethane and polyurethane technology, used in textiles, papermaking, fiber processing, etc., can solve problems such as poor elasticity, rough surface, and easy brittle cracking, and achieve the effects of improving chain extension, increasing elongation at break, and avoiding pollution.

Active Publication Date: 2012-03-28
SHANXI YUBANG NEW POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortcomings of polyacrylate coating agent coatings such as rough surface, poor elasticity, and brittleness at low temperature, this type of coating is only suitable for medium and low-grade coated fabrics.

Method used

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Examples

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Embodiment Construction

[0014] The technical solutions of the present invention will be described in detail below in conjunction with examples.

[0015] The preparation method of modified polyurethane of the present invention, the reagent that adopts has: polyoxypropylene glycol; Toluene diisocyanate TDI; T12 catalyst; Dimethylol propionic acid; Hydroxyethyl acrylate; Amines; deionized water. Specifically include the following steps:

[0016] Under the protection of nitrogen, add polyoxypropylene glycol into the reaction vessel equipped with a thermometer (thermocouple can be used) and agitator (FLUKE high-speed emulsification disperser), and after the temperature rises to 75-80°C, add TDI and T12 catalyst to react After 2 hours, add dimethylolpropionic acid for 30 minutes, add hydroxyethyl acrylate for another 1 hour, chain extender 1.4-butanediol for 1 hour, and cool down the prepolymer after chain extension to 30 degrees Celsius , under the high-speed stirring of the FLUKE high-speed emulsificat...

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Abstract

The invention discloses a preparation method for modified polyurethane. The preparation method comprises the following steps of: adding polypropylene oxide glycol into a reaction vessel; heating to 75 to 80 DEG C; adding toluene diisocynate (TDI) and a T12 catalyst and reacting for 2 hours; adding dimethylol propionic acid and reacting for 30 minutes; adding hydroxyethyl acrylate and reacting for1 hour; adding a chain extender 1,4-butanediol and reacting for 1 hour; cooling to 30 DEG C after the reaction is finished; adding a KOH solution into prepolymer with stirring at a high speed and dispersing for 20 minutes, wherein the pH value is 7 to 8; adding ethanediamine and reacting with stirring for 20 minutes; and adding deionized water under the action of high shearing force to prepare water-based polyurethane emulsion. Therefore, by the method, the breaking elongation, the moisture permeability and the air permeability of the modified polyurethane are improved effectively.

Description

technical field [0001] The invention relates to a method for preparing polyurethane, in particular to a method for preparing polyurethane modified with hydroxyethyl acrylate. Background technique [0002] Coating finishing is a new type of finishing process, which can endow fabrics with many specific functions, such as water repellency, breathability, moisture permeability, windproof, anti-drilling, oil-proof, radiation-proof and flame-retardant properties. It is also possible to carry out special advanced finishing on fabrics. For example: one-sided dyeing, glitter effects and color mixing effects. Therefore, coating finishing technology has been greatly developed. [0003] Coating agents used in coating finishing mainly include: natural and synthetic rubber, polyvinyl chloride, silicone elastomer, polyacrylate, polyurethane, etc. In fine coating processing, the following two materials are mainly used. In our country, polyacrylates are widely used in fine coated fabrics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/34C08G18/10C08G18/16D06M15/568
Inventor 钱华张宁荣
Owner SHANXI YUBANG NEW POWER SCI & TECH
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