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High-solid-content waterborne polyurethane and preparation method thereof

A technology of water-based polyurethane and high solid content, applied in the field of polyurethane materials, can solve the problems of low solid content of water-based polyurethane, and achieve the effect of solving environmental pollution and excellent resistance to ultraviolet aging.

Pending Publication Date: 2021-12-21
CHONGQING ZONJO RENEWABLE RESOURCES DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to overcome the problem of low solid content of existing water-based polyurethane, and provide a method for preparing water-based polyurethane with high solid content

Method used

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  • High-solid-content waterborne polyurethane and preparation method thereof
  • High-solid-content waterborne polyurethane and preparation method thereof
  • High-solid-content waterborne polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 Embodiment 1～5

[0030] Embodiment 1 Embodiment 1~5 is prepared according to the following steps:

[0031] a. Dry polyols, alcohol chain extenders, amine chain extenders, hydrophilic chain extenders, and small molecule chain extenders at 100-120°C for 2-3 hours in vacuum before use;

[0032] b. Add solvents, isocyanates and polyols in proportion to a dry three-necked flask with a stirrer, a thermometer and a reflux condenser;

[0033] c. continue to add a certain amount of tin catalyst, in N 2 Under protection, react at 40-60°C for 20-40 minutes, then raise the temperature to 70-80°C and continue to react for 60-80 minutes;

[0034] d. Add hydrophilic chain extender and alcohol chain extender in proportion and raise the temperature to 90-95°C for 40-50 minutes, then continue to add amine chain extender in proportion to react for 30-40 minutes;

[0035] e. Add a small molecule chain extender in proportion to continue the reaction for 30-40 minutes, then add a certain amount of salt-forming ag...

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Abstract

The invention relates to the field of polyurethane materials, in particular to high-solid-content waterborne polyurethane and a preparation method thereof. The high-solid-content waterborne polyurethane is prepared from the following components in parts by weight: 40 to 60 parts of isocyanates, 60 to 80 parts of polyols, 0.2 to 0.5 part of catalysts, 3 to 10 parts of alcohol chain extenders, 5 to 8 parts of amine chain extenders, 5 to 10 parts of hydrophilic chain extenders, 1 to 10 parts of micromolecule chain extenders, 1 to 3 parts of end-capping reagents, 3 to 5 parts of salt-forming agents, 30 to 50 parts of solvents and 100 to 200 parts of emulsifiers. Based on the characteristic that isocyanato of polyisocyanate can be subjected to Michael addition reaction with active groups such as hydroxyl, amido and water, a plurality of chain extenders are adopted to carry out chain extension addition reaction on a polyurethane prepolymer, and finally, the waterborne polyurethane with high solid content is prepared through neutralization and emulsification. In addition, the polyurethane is aqueous, so that the polyurethane is green and environment-friendly.

Description

technical field [0001] The invention relates to the field of polyurethane materials, in particular to a high-solid-content aqueous polyurethane and a preparation method thereof. Background technique [0002] Polyurethane, as a new type of polymer material, can not only make up for the shortcomings of traditional acrylic resins with poor weather resistance, but also make up for the shortcomings of water-based epoxy resins that are easy to crack. It is being more and more widely used in construction, automobiles, and ships. , high-speed rail, wood, leather and other coating fields. Due to the high content of volatile organic compounds, oily polyurethane has serious environmental pollution and does not conform to the development concept of "green water and green mountains", and is being gradually eliminated. Although water-based polyurethane meets the requirements of environmental protection, its low solid content seriously restricts its use. [0003] CN109824850A discloses a...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/48C08G18/42C08G18/12C08G18/34C08G18/32C08G18/08
CPCC08G18/7614C08G18/7678C08G18/755C08G18/751C08G18/4018C08G18/4238C08G18/4825C08G18/4829C08G18/12C08G18/0823C08G18/348C08G18/3206C08G18/3228
Inventor 郭峰达瓦扎西战琦琦李福建张瑜
Owner CHONGQING ZONJO RENEWABLE RESOURCES DEV CO LTD
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