Poly(carbonate-ether) polyurethane emulsion for printing glue and preparation method thereof

A technology of polyurethane emulsion and carbonate, which is applied in dyeing, textile and paper making, and can solve the problems of mutual contact, high viscosity of polyurethane prepolymer, and high cost of raw materials

Active Publication Date: 2021-03-19
SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easy to prepare high-solid emulsions with polyether polyols as raw materials, but the film strength is low and the abrasion resistance is poor
Polyurethane prepolymers prepared from polyester polyols have relatively high viscosity and lower solid content than polyether-based polyurethanes, and polyester-based water-based polyurethanes have the disadvantages of poor storage stability and poor hydrolysis resistance.
Although the water-based polyurethane prepared by polytetrahydrofuran diol and polycarbonate diol has the advantages of high strength, hydrolysis resistance and good weather resistance, the cost of raw materials is high and it is difficult to prepare high solid emulsion by conventional processes.
Take the acetone method as an example: choose a polycarbonate polyol with strong crystallinity, add a large amount of acetone to dilute the prepolymer during the synthesis process, and it can still emulsify smoothly. The high temperature of the heating medium and the long desolvation time will cause the boundary layer bound water between polyurethane particles to volatilize, and the emulsion particles to contact each other, the viscosity of the emulsion will increase, and even become a paste, which will affect the preparation of high solid content emulsion

Method used

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  • Poly(carbonate-ether) polyurethane emulsion for printing glue and preparation method thereof
  • Poly(carbonate-ether) polyurethane emulsion for printing glue and preparation method thereof
  • Poly(carbonate-ether) polyurethane emulsion for printing glue and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]9 parts of isophorone diisocyanate (IPDI), 7 parts of hexamethylene diisocyanate (HDI), 40 parts of poly(carbonate-ether) glycol (molecular weight 2500, polycarbonate unit 60%), polytetrahydrofuran 10 parts of polyol (molecular weight 1000), 2 parts of trimethylolpropane polyethylene glycol monomethyl ether (molecular weight 1000), 0.4 part of 1,4-butanediol, 1 part of sodium ethylenediaminoethanesulfonate, organic 0.03 part of bismuth catalyst, 45 parts of acetone, 50 parts of deionized water, 0.5 part of isophorone diamine;

[0038] Preparation:

[0039] (1) Heat poly(carbonate-ether) diol and polytetrahydrofuran diol to 100°C, remove water from the polyol under reduced pressure, cool down to 65°C in an inert atmosphere, add trimethylolpropane polyethylene glycol Alcohol monomethyl ether, 1,4-butanediol, diisocyanate and catalyst, react at 80°C for 3 hours, during the reaction, add acetone to adjust the viscosity of the reaction system to 3000-4000cp (45°C), measure N...

Embodiment 2

[0043] 10 parts of isophorone diisocyanate (IPDI), 6 parts of hexamethylene diisocyanate (HDI), 40 parts of poly(carbonate-ether) glycol (molecular weight 2500, polycarbonate unit 60%), polytetrahydrofuran 20 parts of polyol (molecular weight 2000), 4 parts of trimethylolpropane polyethylene glycol monomethyl ether (molecular weight 1200), 0.5 part of neopentyl glycol, 2.5 parts of sodium ethylenediaminoethanesulfonate, 0.03 parts of organic bismuth catalyst Parts, 55 parts of acetone, 52 parts of deionized water, 0.5 parts of ethylenediamine;

[0044] Preparation:

[0045] (1) Heat poly(carbonate-ether) diol and polytetrahydrofuran diol to 110°C, remove water from the polyol under reduced pressure, cool down to 70°C in an inert atmosphere, add trimethylolpropane polyethylene glycol Alcohol monomethyl ether, 1,4-butanediol, diisocyanate and catalyst, react at 90°C for 2h, during the reaction, add acetone to adjust the viscosity of the reaction system to 3000-4000cp (45°C), me...

Embodiment 3

[0049] 15 parts of isophorone diisocyanate (IPDI), 8 parts of hexamethylene diisocyanate (HDI), 35 parts of poly(carbonate-ether) glycol (molecular weight 2500, polycarbonate unit 60%), polytetrahydrofuran 20 parts of polyol (molecular weight 2000), 5 parts of trimethylolpropane polyethylene glycol monomethyl ether (molecular weight 1200), 1 part of neopentyl glycol, 2.5 parts of sodium ethylenediaminoethanesulfonate, organic bismuth catalyst 0.03 part, 58 parts of acetone, 55 parts of deionized water, 0.8 part of hydrazine hydrate;

[0050] The preparation method was the same as in Example 1 to obtain a poly(carbonate-ether) type aqueous polyurethane emulsion with a solid content of 60%.

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PUM

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Abstract

The invention discloses a poly(carbonic ester-ether) type polyurethane emulsion for printing paste and a preparation method thereof. The poly(carbonic ester-ether) type polyurethane emulsion for printing paste is prepared from, by weight, 30-40 parts of poly(carbonic ester-ether) diol, 16-30 parts of diisocyanate, 10-20 parts of polyether glycol, 2-5 parts of a nonionic hydrophilic chain extender,0.03-0.05 part of a catalyst, 0.4-4.0 parts of a non-hydrophilic small-molecular chain extender, 1-2.5 parts of an ionic hydrophilic chain extender, 50-55 parts of water and 0.5-1.0 part of a post-chain extender. The poly(carbonic ester-ether) type polyurethane emulsion of the invention has excellent softness, high elasticity and normal / low-temperature bending resistance. The water-based polyurethane emulsion of the invention has the advantages of low raw material cost, excellent hand feeling, high rebound, high elasticity, resistance to humidity and heat, warping strength and good compatibility with pigments and fillers.

Description

technical field [0001] The invention relates to a poly(carbonate-ether) type water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Screen printing is a production process for printing on textiles instead of dyes. Printing glue is the main raw material for screen printing: in order to reflect the softness and elasticity of knitwear, the main resin in the glue must have the characteristics of softness, dryness, non-stickiness and hardness; in order to facilitate construction and ensure the thickness of screen printing, the resin is required to have a high Contains. Most of the traditional printing resins are water-based acrylate emulsions. Because acrylate resins have poor film-forming elasticity, hot stickiness and brittleness, poor washing fastness, and are easy to block the net when compounded into glue, it has become a difficulty in elasticity, softness and easy construction. Water-based polyurethane can effectively make up for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/52C08G18/32C08G18/44C08G18/48C08G18/73C08G18/75C08G18/66C08G18/12
CPCC08G18/0828C08G18/12C08G18/3206C08G18/4018C08G18/44C08G18/48C08G18/4808C08G18/4833C08G18/4854C08G18/6618C08G18/6685C08G18/722C08G18/73C08G18/755D06P1/5285C08G18/3228C08G18/3234
Inventor 宋海峰王焕蒋红梅陆银锋唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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