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Waterborne polyurethane printing ink connecting material and preparation method thereof

A technology of ink binder and water-based polyurethane, which can be used in ink, applications, household appliances, etc. It can solve the problems of poor emulsion stability, complicated process, and high cross-linking density, and achieve low surface tension, simple reaction process, and adhesion performance. enhanced effect

Inactive Publication Date: 2017-02-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent CN103980461 discloses a preparation method of a hydrolysis-resistant water-based polyurethane dispersion, which is cross-linked and modified by synthesizing a polyurethane prepolymer, and then adding an end-capping agent 1-aminopropyl-2-methylimidazole for emulsification. The obtained water-based polyurethane has good water resistance, but the cross-linking chain extension in the prepolymer stage of this method is likely to cause excessive cross-linking density, high molecular weight, difficult emulsification, and poor emulsion stability; patent CN103910851 discloses a water-based A method for preparing a polyurethane binder. The binder prepared by this method has good adhesion fastness to plastic films, and has good water resistance and cooking resistance, and has excellent comprehensive performance. However, the method is fed in batches for many times. The process is complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Synthesis of polyurethane prepolymer: Add 60 g of dehydrated polyε-caprolactone diol and 29.8 g of isophorone diisocyanate 80 After keeping the temperature at ℃ for 2 hours, cool down to 75℃ and add 3.98g of dimethylol propionic acid (DMPA) dissolved in 2g of N-methylpyrrolidone, mix and stir for 1.5h, and then slowly dropwise add DMPA mixed with 4g of acetone at 70℃. 4.68g of 1,4-butanediol, dripped in about 15 minutes, kept the temperature for 1.5 hours, and finally lowered the temperature to 50°C and added a small amount of acetone to reduce the viscosity. After 5 minutes, added 3g of triethylamine to neutralize and react for 15 minutes to prepare NCO-terminated polyurethane Polymer.

[0032] (2) Emulsification, post-chain extension and crosslinking of water-based polyurethane prepolymer: cool down the polyurethane prepolymer synthesized in step (1) to about 40°C, pour 120g of deionized water and increase the stirring speed to 6500r / min After the prepolymer was ...

Embodiment 2

[0035](1) Synthesis of polyurethane prepolymer: Add 60 g of dehydrated polyε-caprolactone diol and 36.8 g of isophorone diisocyanate 80 After 2 hours of heat preservation at ℃, cool down to 75℃ and add 2.8g of dimethylol propionic acid (DMPA) dissolved in 1.5g of N-methylpyrrolidone, mix and stir for 1.5h, then slowly add dropwise at 70℃ and mix with 4g of acetone 5.32g of 1,4-butanediol, dripped in about 15min, kept the temperature for 1.5h, and finally cooled to 30-50℃ and added a small amount of acetone to reduce the viscosity. based polyurethane prepolymers.

[0036] (2) Emulsification, post-chain extension and crosslinking of water-based polyurethane prepolymer: cool down the polyurethane prepolymer synthesized in step (1) to about 40°C, pour 140g of deionized water and increase the stirring speed to 6500r / min After the prepolymer was emulsified by phase inversion dispersion for 5 minutes, 2.3g of ethylenediamine was added to extend the chain, and after stirring for 5 mi...

Embodiment 3

[0039] (1) Synthesis of polyurethane prepolymer: Add 60 g of dehydrated polyε-caprolactone diol and 36.8 g of isophorone diisocyanate 80 After keeping the temperature at ℃ for 2 hours, cool down to 75℃ and add 3.8g of dimethylolpropionic acid (DMPA) dissolved in 2g of N-methylpyrrolidone, mix and stir for 1.5h, and then slowly dropwise add DMPA mixed with 4g of acetone at 70℃. 4.62g of 1,4-butanediol, dripped in about 15 minutes, kept the temperature for 1.5 hours, and finally lowered the temperature to about 50°C and added a small amount of acetone to reduce the viscosity. After 5 minutes, added 2.86g of triethylamine to neutralize and react for 15 minutes to obtain NCO-terminated Polyurethane prepolymers.

[0040] (2) Emulsification, post-chain extension and crosslinking of water-based polyurethane prepolymer: cool down the polyurethane prepolymer synthesized in step (1) to about 40°C, pour 140g of deionized water and increase the stirring speed to 6500r / min After the prepo...

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PUM

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Abstract

The invention belongs to the technical field of waterborne printing ink and discloses a waterborne polyurethane printing ink connecting material and a preparation method thereof. The preparation method includes the steps that oligomer polyhydric alcohol and polyisocyanate react, then a hydrophilic chain extender and an alcohol micromolecular chain extender are sequentially added for a chain extending reaction, and after a reaction product is diluted and neutralized, an NCO-base-terminated polyurethane prepolymer is obtained; the polyurethane prepolymer is subjected to phase inversion emulsion dispersion in water, then an amine chain extender and a silane coupling agent are added for a rear chain extending and cross-linking reaction, and the waterborne polyurethane printing ink connecting material is obtained. The obtained product has excellent water resistance, heat stability and adhesion firmness, and is safe, free of toxins and suitable for printing thin films for food packaging.

Description

technical field [0001] The invention belongs to the technical field of water-based ink, and in particular relates to a water-based polyurethane ink binder and a preparation method thereof. Background technique [0002] Water-based ink, referred to as ink, is made of binder, colorant, water and additives through compound grinding. It is the only one approved by the American Food and Drug Association because of its low VOC content, non-flammability, non-toxicity and no peculiar smell. environmentally friendly inks. Water-based inks are mainly used in gravure printing and flexographic printing. Most of the products are plastic films for packaging. They are mainly used in food packaging, tobacco and alcohol packaging, and children's toy packaging. The requirements are very high. [0003] Binder is the key factor to determine the performance of water-based ink. In recent years, due to its safety, environmental protection and excellent application performance, water-based polyu...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/34C08G18/32C08G18/12C09D11/102
CPCC08G18/755C08G18/0823C08G18/12C08G18/3206C08G18/3228C08G18/348C08G18/3893C08G18/4277C08G18/6659C09D11/102
Inventor 夏正斌张立张燕红张亚君
Owner SOUTH CHINA UNIV OF TECH
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