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Heat-resistant waterborne polyurethane and preparation method thereof

A water-based polyurethane and heat-resistant technology, which is applied in the field of heat-resistant water-based polyurethane and its preparation, can solve the problems of poor heat resistance and water resistance, improve heat resistance, improve heat resistance and water resistance, and simplify the preparation process Effect

Inactive Publication Date: 2014-12-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of poor heat resistance and water resistance in the prior art, and provide a heat-resistant water-based polyurethane and its preparation method

Method used

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  • Heat-resistant waterborne polyurethane and preparation method thereof

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Embodiment 1

[0039] Embodiment 1, a kind of heat-resistant waterborne polyurethane of the embodiment of the present invention, is prepared by the following method, and described method comprises the following steps in sequence:

[0040] Step 101, preparing polyurethane prepolymer: mix 46.5% polytetrahydrofuran diol, 15.5% hexamethylene diisocyanate, 33.1% acrylate monomer (20% styrene, 13.1% hexyl acrylate) ) and 0.74% melamine were added to the dry reactor, the reactor was heated to 80°C, stirred evenly, and then the catalyst dibutyltin dilaurate with a mass percentage of 0.1% was polymerized for 2.0 hours to form a polyurethane prepolymer ;

[0041] Step 102, chain extension reaction: the hydrophilic chain extender dimethylol butyric acid with a mass percentage of 1.2%, the reaction temperature is 70°C, and the reaction time is 2.0 hours;

[0042] Step 103, capping reaction: adding 1.6% by mass of hydroxyethyl acrylate into the reactor for capping reaction, the reaction temperature is 8...

Embodiment 2

[0045] Embodiment 2, the embodiment of the present invention provides a heat-resistant water-based polyurethane, which is prepared by the following method, and the method includes the following steps in sequence:

[0046]Step 201, preparing polyurethane prepolymer: mix 40.7% of polyε-caprolactone diol, 18.2% of isophorone diisocyanate, 33.3% of acrylate monomer (wherein methyl methacrylate 22 %, butyl acrylate 11.3%) and 1.3% melamine were added to the dry reactor, the reactor was heated to 80°C, stirred evenly, and then the catalyst dibutyltin dilaurate with a mass percentage of 0.09% was polymerized for 2.0 Hour, form polyurethane prepolymer;

[0047] Step 202, chain extension reaction: the hydrophilic chain extender dimethylol butyric acid with a mass percentage of 2% is used, the reaction temperature is 80°C, and the reaction time is 2.5 hours;

[0048] Step 203, capping reaction: adding hydroxyethyl methacrylate with a mass percentage of 2.8% to the reactor for capping r...

Embodiment 3

[0051] Embodiment 3, the embodiment of the present invention provides a heat-resistant water-based polyurethane, which is prepared by the following method, and the method includes the following steps in sequence:

[0052] Step 301, preparing polyurethane prepolymer: mix 32.8% polytetrahydrofuran diol, 21.8% isophorone diisocyanate, 32.7% acrylate monomer (including 20.5% methyl methacrylate, 20.5% acrylate Octyl ester 12.2%) and 2.1% melamine were added to the dry reactor, the reactor was heated to 80°C, stirred evenly, and then the catalyst dibutyltin dilaurate with a mass percentage of 0.07% was polymerized for 2.5 hours to form Polyurethane prepolymer;

[0053] Step 302, chain extension reaction: dimethylol butyric acid, a hydrophilic chain extender with a mass percentage of 3.2%, is reacted at a temperature of 75° C. and a reaction time of 2.0 hours;

[0054] Step 303, capping reaction: adding 4.5% by mass hydroxypropyl acrylate into the reactor for capping reaction, the ...

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Abstract

The invention discloses heat-resistant waterborne polyurethane which comprises the following raw materials in percentage by mass: 27%-46.5% of polymer polyol, 15.5%-24.2% of isocyanate, 1.2%-6% of a hydrophilic chain extender, 0.05%-0.1% of a catalyst, 1.3%-2.6% of a crosslinker, 1.6%-7.5% of end-sealing monomers, 31.8%-33.6% of acrylate monomers, 0.8%-4% of volatile alkali and 1%-2% of an initiator based on the acrylate monomers. The invention further discloses a preparation method of heat-resistant waterborne polyurethane. Through the preparation method, the heat resistance of waterborne polyurethane can be improved; no VOC (volatile organic compound) is generated in the preparation process; the overall performance is optimized.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals and their preparation, and in particular relates to a heat-resistant water-based polyurethane and a preparation method thereof. Background technique [0002] A large amount of organic solvents are used in the synthesis process of traditional solvent-based polyurethane materials, resulting in high content of volatile organic compounds (VOC) in the product, which is harmful to the environment and human health. The emission of VOC must be strictly stopped, which objectively promotes the development of water-based polyurethane. [0003] Water-based polyurethane is a new type of polyurethane that replaces organic solvents with water as the dispersion medium. It has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility and easy modification. It is a new type of environmentally friendly material. Since its appearance in the 1930s, it has been ...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G18/83C08G18/66C08G18/32C08G18/12
Inventor 赖小娟宫米娜王磊闫蓓
Owner SHAANXI UNIV OF SCI & TECH
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