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Method for preparing mono-component normal-temperature self-crosslinking water-based polyurethane

A water-based polyurethane and self-crosslinking technology, used in the chemical industry, can solve the problems of poor solvent resistance and mechanical properties, and achieve the effect of enhancing water and solvent resistance.

Inactive Publication Date: 2013-04-03
QINGDAO PENGHAI SOFT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with solvent-based polyurethane, water-based polyurethane can only obtain a linear structure due to the limitation of the synthesis process, and due to the introduction of hydrophilic groups, it often has disadvantages such as water resistance, solvent resistance and poor mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Under the conditions of rotating speed 900r / min and 81℃, polyurethane prepolymer was prepared from isophorone diisocyanate (IPDI), polyethylene glycol (PEG3000) and dimethylol propionic acid (DMPA) for 3 hours. , The molar ratio of IPDI to PEG1000 and DMPA is 1.1:1, and DMPA accounts for 6% of the mass of the prepolymer. During the process, the solvent N-methylpyrrolidone (NMP) was added depending on the viscosity change. Add 3-[bis-(2-hydroxyethyl)] amino-N(1,1-dimethyl-3 butanone) propionamide (DHPA) to crosslink and extend the prepolymer, and the amount of DHPA is prepolymer 2% of aggregate mass. Cool down to 40°C, add triethylamine for neutralization reaction to generate salt, and react for 3 minutes. The amount of substance of triethylamine is the same as that of DMPA. Increase the rotational speed to 1800r / min, add water to emulsify for 60min, and the amount of water used is twice the total mass of the prepolymer. A one-component room temperature self-crosslin...

Embodiment 2

[0018] Under the conditions of rotating speed 900r / min and 81℃, polyurethane prepolymer was prepared from isophorone diisocyanate (IPDI), polyethylene glycol (PEG3000) and dimethylol propionic acid (DMPA) for 3 hours. , The molar ratio of IPDI to PEG1000 and DMPA is 1.1:1, and DMPA accounts for 6% of the mass of the prepolymer. During the process, the solvent N-methylpyrrolidone (NMP) was added depending on the viscosity change. Add 3-[bis-(2-hydroxyethyl)]amino-N(1,1-dimethyl-3-butanone) propionamide (DHPA) to cross-link and extend the prepolymer. The amount of DHPA is 4% of the mass of the prepolymer. Cool down to 40°C, add triethylamine for neutralization reaction to generate salt, and react for 3 minutes. The amount of substance of triethylamine is the same as that of DMPA. Increase the rotational speed to 1800r / min, add water to emulsify for 60min, and the amount of water used is twice the total mass of the prepolymer. A one-component room temperature self-crosslinkin...

Embodiment 3

[0021] Under the conditions of rotating speed 900r / min and 81℃, polyurethane prepolymer was prepared from isophorone diisocyanate (IPDI), polyethylene glycol (PEG3000) and dimethylol propionic acid (DMPA) for 3 hours. , The molar ratio of IPDI to PEG1000 and DMPA is 1.1:1, and DMPA accounts for 6% of the mass of the prepolymer. During the process, the solvent N-methylpyrrolidone (NMP) was added depending on the viscosity change. Add 3-[bis-(2-hydroxyethyl)]amino-N(1,1-dimethyl-3-butanone) propionamide (DHPA) to cross-link and extend the prepolymer. The amount of DHPA is 6% of the mass of the prepolymer. Cool down to 40°C, add triethylamine for neutralization reaction to generate salt, and react for 3 minutes. The amount of substance of triethylamine is the same as that of DMPA. Increase the rotational speed to 1800r / min, add water to emulsify for 60min, and the amount of water used is twice the total mass of the prepolymer. A one-component room temperature self-crosslinkin...

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PUM

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Abstract

The invention discloses a method for preparing mono-component normal-temperature self-crosslinking water-based polyurethane. The method comprises the following steps: taking diol 3-[bis-(2-hydroethyl)] amine-N (1,1-dimethyl-3-butanone) propionamide (DHPA) containing ketone carbonyl as a crosslinking chain extender for preparing polyurethane from isophorone diisocyanate (IPDI) and polyethylene glycol (PEG 3000), adding a hydrophilic chain extender of dimethylolpropionic acid (DMPA), neutralizing the mixture with triethylamine, and adding water for emulsification and separation to obtain the mono-component normal-temperature self-crosslinking water-based polyurethane. The emulsion has the function of self-crosslinking and the characteristics of excellent water and solvent resistances.

Description

technical field [0001] The invention relates to a preparation method of one-component normal-temperature self-crosslinking waterborne polyurethane, which belongs to the field of chemical industry. technical background [0002] Waterborne polyurethane uses water as the medium, which is safe, environmentally friendly and does not pollute the environment. At the same time, it has good physical and mechanical properties, excellent low temperature resistance and weather resistance, and is widely used in coatings, adhesives, clothing finishing, leather and other fields. However, compared with solvent-based polyurethane, water-based polyurethane can only obtain a linear structure due to the limitation of the synthesis process, and due to the introduction of hydrophilic groups, it often has disadvantages such as poor water resistance, solvent resistance, and poor mechanical properties. Crosslinking is an effective method to improve the performance of waterborne polyurethane, and the...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/67C08G18/66C08G18/48C08G18/32C08G18/12
Inventor 王兵于忠清
Owner QINGDAO PENGHAI SOFT CO LTD
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