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Aqueous polyurethane and preparation method thereof

A water-based polyurethane and isocyanate technology, which is applied in the field of polymer materials, can solve the problems of poor resin hydrophilicity, reduced resin strength and extensibility, and decreased mechanical properties of materials, and achieves high solid content, good water resistance and storage stability. The effect of low viscosity

Inactive Publication Date: 2016-01-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses polyester polyols as raw materials, and the synthetic resin is slightly less hydrophilic than polyether polyols. In addition, although small molecule polyols can be used as chain extenders to reduce costs, they will also reduce the strength and extensibility of resins. , leading to a decrease in the mechanical properties of the material

Method used

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  • Aqueous polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of waterborne polyurethane provided by the invention is made successively through following steps:

[0035] 1) Preparation of DMPA solution: 6.32g of DMPA was dissolved in 12.64g of NMP to obtain a DMPA solution;

[0036] 2) Add 31.4gIPDI and 41.70gPTMG into a three-necked reaction flask, put in an oil bath at 90°C, and stir mechanically for 2h; add 1-3 drops of green catalyst Kat24, and continue the reaction for 1h;

[0037] 3) When -NCO% reached 10%, the reaction bottle was taken out from the oil bath and cooled to 40°C, and 18.96g of the DMPA solution prepared in step 1) was added, reacted for 1h, and then raised the temperature to 75°C to continue the reaction for 2h;

[0038] 4) Take the reaction bottle out of the oil bath and cool it to 45°C, add 4.52g of triethylamine to neutralize, continue to stir for 0.5-1.5h, then cool down with ice water for 8min, then increase the stirring speed to 1000r / min, and slowly add 200 grams of 10°C ionized water, after the...

Embodiment 2

[0042] Another kind of water-based polyurethane provided by the invention is made successively through the following steps:

[0043] 1) Preparation of DMPA solution: 4.39g of DMPA was dissolved in 9g of NMP to obtain a DMPA solution;

[0044] 2) Add 33.35gIPDI and 50.00gPTMG into a three-necked reaction flask, put in an oil bath at 85°C, and stir mechanically for 2h; add 1-3 drops of green catalyst Kat24, and continue the reaction for 1h;

[0045] 3) When -NCO% reached 10%, the reaction bottle was taken out from the oil bath and cooled to 40°C, and 13.39g of the DMPA solution prepared in step 1) was added, reacted for 1h, and then raised the temperature to 75°C to continue the reaction for 2h;

[0046] 4) Take the reaction bottle out of the oil bath and cool it to 45°C, add 3.31g of triethylamine to neutralize it, continue to stir for 1.5h, then cool down with ice water for 10min, then increase the stirring speed to 1100r / min, and slowly add 200g Ionized water at 10°C, after ...

Embodiment 3

[0050] Another kind of water-based polyurethane provided by the invention is made successively through the following steps:

[0051] 1) Preparation of DMPA solution: 8.05g of DMPA was dissolved in 16g of NMP to obtain a DMPA solution;

[0052] 2) Add 44.46g of IPDI and 66.70g of PTMG into a three-necked reaction flask, put in an oil bath at 80°C, and stir mechanically for 2 hours; add 1-3 drops of green catalyst Kat24 (BorchiKat24, a tin-free environmental protection catalyst), and continue the reaction for 2 hours;

[0053] 3) When -NCO% reached 10%, the reaction bottle was taken out from the oil bath and cooled to 45°C, and 24.05g of the DMPA solution prepared in step 1) was added, reacted for 2h, and then raised the temperature to 80°C to continue the reaction for 2h;

[0054] 4) Take the reaction bottle out of the oil bath and cool it to 45°C, add 6.07g of triethylamine to neutralize, continue to stir for 1.5h, then cool down with ice water for 5min, then increase the stirri...

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Abstract

The present invention discloses an aqueous polyurethane and a preparation method thereof. A purpose of the present invention is to provide an aqueous polyurethane with characteristics of good environmental protection, high solid content, low viscosity and good stability. The technical scheme is that the aqueous polyurethane is prepared from 8-20% ofaliphatic isocyanate, 10-20% ofpolyether polyol, 1-5% of DMPA, 1-3% of triethylamine, 0.1-3% of ethylene diamine, 0-3% of diethylene triamine, and 60-80% of water, and the aqueous polyurethane belongs to the technical field of polymer materials.

Description

technical field [0001] The invention relates to a method for preparing water-based polyurethane, specifically, a method for preparing water-based polyurethane by stepwise polymerization, and belongs to the technical field of polymer materials. Background technique [0002] Water-based polyurethane (WPU) is a binary colloid system with water as the dispersion medium. It not only has the advantages of solvent-based polyurethane (PU) (such as excellent low temperature resistance, good flexibility and high bonding strength, etc.), but also has non-flammable properties. , low odor, no pollution to the environment, energy saving and convenient operation and construction. At present, WPU has been widely used in coatings, adhesives (including the bonding of automotive interior parts, decorative materials, composite films, soles and uppers) and leather finishing agents. At present, there are many domestic research reports on aromatic isocyanate WPU, but less research on aliphatic is...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/32C08G18/12C08G18/16
CPCC08G18/755C08G18/0852C08G18/12C08G18/168C08G18/348C08G18/4854C08G18/6692C08G18/3228
Inventor 姬文晋张磊宋巍郑育英庄鸿杰
Owner GUANGDONG UNIV OF TECH
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