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

Method used

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  • Heat-resistant waterborne polyurethane and preparation method thereof

Examples

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Example Embodiment

[0039] Example 1, an example of the present invention, is a heat-resistant water-based polyurethane prepared by the following method, which sequentially includes the following steps:

[0040] Step 101. Prepare polyurethane prepolymer: combine 46.5% polytetrahydrofuran glycol, 15.5% hexamethylene diisocyanate, 33.1% acrylate monomer (including 20% ​​styrene and 13.1% hexyl acrylate). ) And 0.74% of melamine are added to the drying reactor, the reactor is heated to 80 ℃, stirred uniformly, and then 0.1% by mass of the catalyst dibutyl tin dilaurate 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, end-capping reaction: adding 1.6% by mass of hydroxyethyl acrylate to the reactor for end-capping reaction, the reaction temperature is 80° C., and the time is 1.0 hour;

[0...

Example Embodiment

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

[0046] Step 201. Preparation of polyurethane prepolymer: 40.7% by mass of polyε-caprolactone diol, 18.2% of isophorone diisocyanate, 33.3% of acrylate monomer (of which methyl methacrylate 22 %, butyl acrylate 11.3%) and 1.3% of melamine were added to the drying reactor, the reactor was heated to 80 ℃, stirred evenly, and then 0.09% by mass of the catalyst dibutyl tin dilaurate was polymerized 2.0 Hours to form polyurethane prepolymer;

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

[0048] Step 203, end-capping reaction: adding 2.8% by mass of hydroxyethyl methacrylate to the reactor for end-capping reaction, the reaction temperature is 70° C....

Example Embodiment

[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 sequentially includes the following steps:

[0052] Step 301. Preparation of polyurethane prepolymer: 32.8% polytetrahydrofuran glycol, 21.8% isophorone diisocyanate, 32.7% acrylate monomer (of which methyl methacrylate 20.5%, acrylic acid Octyl ester 12.2%) and 2.1% melamine were added to the drying reactor, the reactor was heated to 80 ℃, stirred uniformly, and then 0.07% of the mass percentage of the catalyst dibutyl tin dilaurate was polymerized for 2.5 hours to form Polyurethane prepolymer;

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

[0054] Step 303, end-capping reaction: adding 4.5% by mass of hydroxypropyl acrylate to the reactor for end-capping react...

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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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