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Preparation method and application of crosslinked formaldehyde-free color fixing agent RF

An aldehyde-free color-fixing agent and reaction technology, applied in the direction of dyeing, textile and papermaking, etc., to achieve the effect of small color change, improved fastness, and excellent color-fixing effect

Inactive Publication Date: 2018-09-04
IANGSU COLLEGE OF ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, people have been using dicyandiamide and formaldehyde condensation resin color fixing agent to fix the color of textiles, but there is a problem of formaldehyde release. With the increasing awareness of environmental protection, dyeing auxiliaries continue to develop in the direction of green environmental protection, high efficiency and energy saving , aldehyde-free or low-aldehyde color fixing agents have become the main direction of development and application

Method used

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  • Preparation method and application of crosslinked formaldehyde-free color fixing agent RF
  • Preparation method and application of crosslinked formaldehyde-free color fixing agent RF
  • Preparation method and application of crosslinked formaldehyde-free color fixing agent RF

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0021] A preparation method of crosslinked formaldehyde-free color fixing agent RF, comprising the steps of:

[0022] (1) Prepare polyurethane prepolymer solution:

[0023] In a 500mL four-neck flask equipped with a stirrer, a thermometer, and a condensing reflux tube, add dehydrated isophorone diisocyanate (IPDI) and hydrophilic chain extender tertiary amine polyoxyethylene ether (molecular weight: 600) in proportion. , heated up to 40°C, and reacted for 1 hour to obtain a polyurethane prepolymer solution; the chemical reaction was as follows:

[0024]

[0025] (2) Preparation of cross-linked formaldehyde-free color fixing agent RF:

[0026] Cool down the prepared polyurethane prepolymer solution to room temperature, add acetone to adjust the viscosity of the system, add metered acetic acid to neutralize the reaction for 20 minutes, add metered sodium bisulfite to capping reaction for 30 minutes, add water to high-speed stirring emulsification, and finally depressurize to...

specific Embodiment 2

[0033] A preparation method of crosslinked formaldehyde-free color fixing agent RF, comprising the steps of:

[0034] (1) Prepare polyurethane prepolymer solution:

[0035] In a 500mL four-neck flask equipped with a stirrer, a thermometer, and a condensing reflux tube, add dehydrated isophorone diisocyanate (IPDI) and hydrophilic chain extender tertiary amine polyoxyethylene ether (molecular weight: 600) in proportion. , heated up to 60°C, and reacted for 2 hours to obtain a polyurethane prepolymer solution; the chemical reaction was as follows:

[0036]

[0037] (2) Preparation of cross-linked formaldehyde-free color fixing agent RF:

[0038] Cool the prepared polyurethane prepolymer solution to room temperature, add acetone to adjust the viscosity of the system, add metered acetic acid for neutralization reaction for 40 minutes, add metered amount of sodium bisulfite for capping reaction for 50 minutes, add water and high-speed stirring for emulsification, and finally re...

specific Embodiment 3

[0045] A preparation method of crosslinked formaldehyde-free color fixing agent RF, comprising the steps of:

[0046] (1) Prepare polyurethane prepolymer solution:

[0047] In a 500mL four-neck flask equipped with a stirrer, a thermometer, and a condensing reflux tube, add dehydrated isophorone diisocyanate (IPDI) and hydrophilic chain extender tertiary amine polyoxyethylene ether (molecular weight: 600) in proportion. , heated up to 50°C, and reacted for 1.5h to obtain a polyurethane prepolymer solution; the chemical reaction was as follows:

[0048]

[0049] (2) Preparation of cross-linked formaldehyde-free color fixing agent RF:

[0050] Cool the prepared polyurethane prepolymer solution to room temperature, add acetone to adjust the viscosity of the system, add metered acetic acid for neutralization reaction for 30 minutes, add metered amount of sodium bisulfite for capping reaction for 40 minutes, add water and high-speed stirring for emulsification, and finally remov...

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Abstract

The invention discloses a preparation method and the application of a crosslinked formaldehyde-free color fixing agent RF. The preparation method comprises the following steps: preparing a polyurethane prepolymer solution; and preparing the crosslinked formaldehyde-free color fixing agent RF. A formaldehyde-free reaction color fixing agent which serves as active dye and direct dye to dye cotton fabrics is produced with the method, and the wet color fastness of the dyeing object is improved. In the color fixing process of the product, sodium hydrogen sulfite is deblocked, one piece of -NCO is generated and performs addition reaction with -OH on cotton type fiber, and the other one piece of -NCO is subjected to covalent bonding with -NH2 or -OH on the dye, so that the fastness is improved. Moreover, the product contains a large amount of N atoms which can form a hydrogen bond and a Van der Waals force with the -OH in the cotton type fiber and has high anchoring capability, so that an excellent color fixing effect is achieved, the rubbing fastness can be increased by 1 to 2 levels and the wet rubbing fastness reaches level 4 to 5.

Description

technical field [0001] The invention belongs to the technical field of textile auxiliaries, and in particular relates to a preparation method and application of a crosslinking formaldehyde-free color fixing agent RF. Background technique [0002] Fixing agent is an auxiliary agent used to improve the color fastness of dyes on fabrics to wet treatment, and is one of the indispensable and important auxiliary agents in the printing and dyeing industry. For a long time, people have been using dicyandiamide and formaldehyde condensation resin color fixing agent to fix the color of textiles, but there is a problem of formaldehyde release. With the increasing awareness of environmental protection, dyeing auxiliaries continue to develop in the direction of green environmental protection, high efficiency and energy saving , No aldehyde or low aldehyde color fixing agent has become the main direction of development and application. Contents of the invention [0003] Purpose of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/50C08G18/83D06P5/10D06P1/38D06P3/66
CPCC08G18/5021C08G18/755C08G18/831D06P1/38D06P3/66D06P5/10
Inventor 唐菊肖慧
Owner IANGSU COLLEGE OF ENG & TECH
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