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Waterborne polyurethane dispersoid with high solid content as well as preparation method and application of waterborne polyurethane dispersoid

A water-based polyurethane, high solid content technology, applied in the field of water-based polyurethane, can solve the problems of aggravating global warming, reducing system viscosity, environmental pollution, etc., and achieving the effects of reducing transportation costs, low prices, and easy availability of raw materials

Pending Publication Date: 2022-07-15
QUZHOU RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the water-based polyurethane resins reported above are usually prepared from petroleum-based raw materials. Extensive use of petroleum-based raw materials will increase the exploitation of fossil resources and aggravate global warming, which will bring negative impacts on society and human beings.
In addition, organic solvents are used to reduce the viscosity of the system in the above-mentioned polyurethane synthesis process, and toxic catalysts (dibutyltin dilaurate, stannous octoate, or tin octoate, etc.) participate in the reaction, and the catalyst in the final product cannot be removed. It will pollute the environment and affect the application of water-based polyurethane dispersions

Method used

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  • Waterborne polyurethane dispersoid with high solid content as well as preparation method and application of waterborne polyurethane dispersoid
  • Waterborne polyurethane dispersoid with high solid content as well as preparation method and application of waterborne polyurethane dispersoid
  • Waterborne polyurethane dispersoid with high solid content as well as preparation method and application of waterborne polyurethane dispersoid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Weigh 8.2g of norbornene dianhydride and 6.1g of tris(hydroxymethyl)aminomethane according to the ratio of the acid anhydride functional group of norbornene dianhydride to tris(hydroxymethyl)aminomethane amino functional group at 1:1.2 and dissolve in 200mL In methanol, the temperature was raised to 50 °C with magnetic stirring, reacted for 1 hour under nitrogen protection, and after rotary evaporation at 45 °C, a chain extender A with catalytic and hyperbranched properties was obtained.

[0053] (2) get 0.01mol castor oil 9.3g, add 0.04mol isophorone diisocyanate 8.9g, pass nitrogen, be warming up to 80 ℃ and react for 4 hours, then add 0.03mol polyethylene glycol 18g and react for 1.5 hours to obtain bio-based To the hyperbranched polyurethane prepolymer, add 2.85 g of chain extender A (0.01 mol) with catalytic hyperbranching properties obtained in step (1), react for 2 hours, and dry to obtain bio-based hyperbranched polyurethane.

[0054] (3) Take 18 g of bio-ba...

Embodiment 2

[0057] The preparation method of high solid content aqueous polyurethane dispersion comprises the following steps:

[0058] (1) According to the functional group ratio of the acid anhydride functional group of methyl nadic anhydride to the amino functional group of tris(hydroxymethyl) aminomethane, 1:1.2, take 9 g of methyl nadic anhydride and 7.2 g of tris(hydroxymethyl) aminomethane to dissolve In 350 mL of methanol, the temperature was raised to 50 °C with magnetic stirring, reacted for 1 hour under nitrogen protection, and after rotary evaporation at 45 °C, a chain extender with catalytic and hyperbranched properties was obtained.

[0059] (2) get 0.03mol castor oil 27.9g, add 0.09mol isophorone diisocyanate 20g, pass nitrogen, be warming up to 80 DEG C and react for 4 hours, then add 0.08mol polyethylene glycol 48g and react for 2 hours to obtain bio-based hyperbranching The polyurethane prepolymer was synthesized, and 5.7 g of the chain extender (0.02 mol) with catalytic...

Embodiment 3

[0063] The preparation method of high solid content aqueous polyurethane dispersion comprises the following steps:

[0064] (1) According to the functional group ratio of the acid anhydride functional group of norbornene dioic anhydride to the functional group of tris(hydroxymethyl)aminomethane amino group of 1:1.4, take 9g of norbornene dianhydride and 9.6g of tris(hydroxymethyl)aminomethane dissolved in In 350 mL of methanol, the temperature was raised to 30 °C with magnetic stirring, reacted under nitrogen protection for 2 hours, and after rotary evaporation at 45 °C, a chain extender with catalytic and hyperbranched properties was obtained.

[0065] (2) get 0.04mol castor oil 37.3g, add 0.1mol isophorone diisocyanate 22.3g, pass nitrogen, be warming up to 80 DEG C and react for 4 hours, then add 0.13mol polytetrahydrofuran 80g and react for 2 hours to obtain bio-based hyperbranched To the polyurethane prepolymer, add 8.5 g of the chain extender (0.03 mol) with catalytic hy...

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Abstract

The invention relates to the technical field of waterborne polyurethane, and discloses a high-solid-content waterborne polyurethane dispersoid as well as a preparation method and application thereof.The high-solid-content waterborne polyurethane dispersoid is prepared from the following raw materials: 40-55% of bio-based hyperbranched polyurethane, 0.5-5% of a neutralizing agent, 0.5-5% of a sulfonate chain extender and the balance of water; the preparation method comprises the following steps: reacting organic acid anhydride with tris (hydroxymethyl) aminomethane in a solvent to prepare a hyperbranched chain extender; vegetable oil, diisocyanate and high polymer dihydric alcohol are subjected to a reaction to prepare a bio-based branched polyurethane prepolymer, a hyperbranched chain extender is added into the system for a reaction, and the bio-based hyperbranched polyurethane is obtained. The solid content of the dispersion can reach 50%-65%, the particle size of the dispersion is smaller than 250 nm, the dispersion can be stably stored for a long time, meanwhile, the dispersion has the characteristics of high solid content, bio-based raw materials, no solvent and autocatalysis, and the dispersion has important significance on industry development.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane, in particular to a high-solid content water-based polyurethane dispersion and a preparation method and application thereof. Background technique [0002] Aqueous polyurethane dispersion is an emulsion liquid in which gel-forming particles are evenly dispersed in water. During use, it relies on the fusion of polymer particles to form a continuous coating film with uniform distribution. It is widely used in digital printing, textiles, construction, coatings, adhesives. pharmaceuticals, packaging, etc. However, most waterborne polyurethane emulsions currently on the market have low solid content (20% to 40%), and have the disadvantages of low production efficiency, high product packaging and transportation costs, slow water volatilization, and high energy consumption. [0003] High solid content waterborne polyurethane dispersion (solid content ≥ 50%) has low water content, short d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/12C08G18/36C08G18/42C08G18/48C08G18/32C08G18/67
CPCC08G18/12C08G18/6696C08G18/4833C08G18/36C08G18/4854C08G18/6662C08G18/4277C08G18/676C08G18/3857
Inventor 刘浏段金汤蒋明哲冯连芳张才亮顾雪萍
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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