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Preparation method for blocked waterborne polyurethane and application of blocked waterborne polyurethane to preparation of digital printing waterborne paint ink

A water-based polyurethane, end-capped technology, used in dyeing, textiles and papermaking, etc., can solve the problems of dry and wet friction, poor washing fastness, affect the hand feel, and hard film formation, and improve the friction resistance and washing fastness. , The effect of high washing fastness and easy dispersion

Active Publication Date: 2017-07-14
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the glass transition temperature (Tg) of polyacrylate is low, it is soft and sticky, and the dry and wet friction and washing fastness are poor; if the Tg is high, the friction resistance and washing performance are improved, but the film is hard, which affects the hand feel

Method used

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  • Preparation method for blocked waterborne polyurethane and application of blocked waterborne polyurethane to preparation of digital printing waterborne paint ink
  • Preparation method for blocked waterborne polyurethane and application of blocked waterborne polyurethane to preparation of digital printing waterborne paint ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The end-capped water-based polyurethane emulsion of the SME modification of the present embodiment, its specific preparation process is as follows:

[0048] S1. Heat and stir 14.3g of SME (Mn=2800, SMA 17352 of Crayville Chemical Co., Ltd.), 1.7g of 1,4-butanediol, 0.6g of p-toluenesulfonic acid and 83.4g of methyl ethyl ketone, and heat up to 80°C , heat preservation reaction for 4h, and post-treatment to obtain SME solid with hydroxyl groups;

[0049] S2. Prepolymerize 60.61g of dehydrated polypropylene glycol (Mn=2000), 18.53g of isophorone diisocyanate, and 0.01g of stannous octoate at 85°C for 2 hours, and add the hydroxyl SME9.21g, continue to react for 2 hours, then add 2.00g of 1,4-butanediol, chain extension reaction for 1 hour, to obtain polyurethane prepolymer;

[0050] S3. Cool down and add 5.88g of 3,5-dimethylpyrazole for capping, then raise the temperature to 70°C for 2 hours;

[0051] S4. down to room temperature, add acetone to reduce viscosity, add 3...

Embodiment 2

[0059] The end-capped water-based polyurethane emulsion of the SME modification of the present embodiment, its specific preparation process is as follows:

[0060] S1. Heat and stir 17.5g of SME (Mn=2800, SMA 17352 of Crayville Chemical Co., Ltd.), 2.5g of 1,4-butanediol, 0.7g of p-toluenesulfonic acid and 79.3g of methyl ethyl ketone, and heat up to 85°C , heat preservation reaction for 6h, and post-treatment to obtain SME solid with hydroxyl groups.

[0061] S2. Prepolymerize 24.99g of dehydrated polypropylene glycol (Mn=2000), 35.70g of polytetramethylene ether glycol, 18.68g of isophorone diisocyanate, and 0.01g of stannous octoate at 85°C After reacting for 2 hours, add 9.49 g of SME with hydroxyl groups obtained from S1, continue the reaction for 2 hours, then add 2.00 g of 1,4-butanediol, and perform a chain extension reaction for 1 hour to obtain a polyurethane prepolymer;

[0062] S3. Lower the temperature and add 5.68g of 3,5-dimethylpyrazole for capping, then raise...

Embodiment 3

[0071] The end-capped water-based polyurethane emulsion of the SME modification of the present embodiment, its specific preparation process is as follows:

[0072] S1. Heat and stir 14.3g SME (Mn=3600, SMA 2625 from Craigville Chemical Co., Ltd.), 1.7g 1,4-butanediol, 0.6g p-toluenesulfonic acid and 83.4g butanone, and heat up to 85°C , heat preservation reaction for 5h, and post-treatment to obtain SME solid with hydroxyl groups.

[0073] S2. 34.83g of dehydrated polypropylene glycol (Mn=2000), 26.79g of polybutylene adipate, 14.54g of hexamethylene diisocyanate, and 0.02g of dibutyltin dilaurate were carried out at 85°C. Prepolymerization reaction for 2 hours, add 11.96g of SME with hydroxyl obtained from S1 (dissolved in a proper amount of acetone), continue the reaction for 2 hours, then add 2.00g of 1,4-butanediol, and perform chain extension reaction for 1 hour to obtain a polyurethane prepolymer;

[0074] S3. Lower the temperature and add 6.10g of 3,5-dimethylpyrazole ...

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Abstract

The invention discloses a preparation method for blocked waterborne polyurethane. The method is characterized in that polyurethane is modified by synthesizing a partially-esterified styrene-maleic anhydride copolymer carrying hydroxyl, so that a polyurethane chain plays a role in strongly anchoring organic pigment particles, the dispersion stability of the organic pigment particles in waterborne polyurethane emulsion and the adhesion of a pigment by a waterborne polyurethane adhesive during inkjet curing are facilitated, and the friction resistance and washing fastness are improved. Meanwhile, the polyurethane is subjected to active blocking, so that an unblocked NCO group can react with an OH group on fiber during heating curing after digital printing waterborne paint ink prepared by taking the blocked waterborne polyurethane emulsion prepared by the method as an adhesive is directly jetted onto a fiber fabric, thereby remarkably improving the color fixing firmness and friction resistance. A printed pattern is bright in color, and is soft in handfeel.

Description

technical field [0001] The invention belongs to the field of polyurethane preparation, in particular to a method for preparing a blocked water-based polyurethane, and also discloses the application of the blocked water-based polyurethane prepared by the method in digital printing water-based pigment inkjet. [0002] technical background [0003] Textile digital printing refers to the process of printing inkjet on fabrics to form patterns through a jet printing system. It is a non-contact and clean printing method. Textile digital printing can realize digitalization in the whole process, without plate making, not limited by color registration, rapid response, high printing precision, strong pattern expression, less waste of dyeing and chemical materials, and no waste water pollution. The requirements of high-quality textile printing and the development of green production are the main direction of the current development of textile printing technology. Compared with dye digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/08C08G18/12C08G18/10C08G18/40C08G18/42C08G18/48C08G18/62C08G18/32D06P1/52
CPCD06P1/5285C08G18/0823C08G18/10C08G18/12C08G18/4063C08G18/4238C08G18/4825C08G18/4854C08G18/6216C08G18/6674
Inventor 王小妹郑嘉颖卢开平卢润初赵文爱
Owner SUN YAT SEN UNIV
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