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Water-based cationic polyurethane bridging agent

A cationic, polyurethane technology, applied in the field of chemistry, can solve the problems of difficulty in direct emulsification or dispersion, severe, shrinkage on the surface of the fabric, etc., and achieve the effects of improving environmental protection, stable storage and reducing content

Inactive Publication Date: 2012-03-28
WUJIANG BEISHE SHENGYUAN TEXTILE PROD AUXILIARIES PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional polyurethane bridging agent is difficult to directly emulsify or disperse in water, and the surface of the fabric obtained in textile printing and dyeing will shrink greatly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] In a clean and dry container equipped with a condenser, add TMP (1.00kmol), diethanolamine (0.5kmol) and N-methylpyrrolidone solvent to prepare a 75% solution, heat up to 40°C-50°C, fully Stir to dissolve. After the mixture is completely dissolved, stop stirring and keep the system temperature at 40°C-50°C for use.

[0012] In a clean and dry reaction kettle, install a condenser, add MDI (5.2kmol), N-methylpyrrolidone and compound catalyst (2.30kg) in vacuum metering, and prepare a solution of about 75%, and close the inlet hole after completion. Cover, start stirring and slowly raise the temperature to 90°C, wait until it is completely dissolved, slowly add the mixture of TMP and diethanolamine dropwise under the condition of 90°C, control the dropping temperature at 90°C-100°C, add dropwise The time is controlled at 1h-2.5h. After the dropwise addition, react at 105°C-125°C for 1.5h, cool down, lower the temperature, drop the metered glycolic acid (0.45kmol) at a temp...

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Abstract

The invention discloses a water-based cationic polyurethane bridging agent. The water-based cationic polyurethane bridging agent is prepared by the following technological steps of: a, adding an N-methylpyrrolidone solvent, diphenylmethanediisocyanate (MDI) and a composite catalyst sequentially into a reactor and heating to 40 DEG C to dissolve the materials completely; b, adding trimethoprim (TMP) slowly in 0.5 to 2 hours, and heating to the temperature of between 30 and 70 DEG C to dissolve the TMP with stirring; and c, adding a cationic hydrophilic agent of diethanol amine, heating to the temperature of between 60 and 100 DEG C, reacting for 1 to 4 hours, cooling to the temperature of below 60 DEG C, adding a small amount of N,N-dimethylethanolamine for neutralization, stirring for 30 MDIn, adding deionized water, and stirring uniformly to obtain faint yellow transparent liquid. The water-based cationic polyurethane bridging agent reduces toxicity, improves water dispersibility of prepolymer, excellent heat treatment performance and storage stability, is suitable for industrialized production, can be widely applicable to crosslinking bridging agents of water-based coatings and dyes, and can also serve as a non-shrinking finishing agent for silk and wool.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to the preparation of modified polyurethane materials. Background technique [0002] The use of polyurethane prepolymers with NCO end groups as cross-linking bridging agents for textile printing and dyeing fabrics requires excellent adhesion, abrasion resistance, good toughness, and good water resistance. Water-based polyurethane has the above advantages, and there are many studies on water-based polyurethane to increase water resistance. Traditional polyurethane bridging agents are difficult to directly emulsify or disperse in water, and the surface of the fabric obtained during textile printing and dyeing will shrink greatly. Contents of the invention [0003] The purpose of the present invention is to provide a low content of free TDI, a novel water-based cationic polyurethane bridging agent, which is stable in storage, excellent in heat treatment performance, and suitable for industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/78C08G18/76C08G18/32C08G18/10C08G18/22
Inventor 钱华张林荣
Owner WUJIANG BEISHE SHENGYUAN TEXTILE PROD AUXILIARIES PLANT
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