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Method for preparing polyurea coating modified with end-capped polyetheramine

A technology of polyetheramine and polyurea, which is applied in the field of preparation of polyetheramine-modified polyurea materials, can solve the problems that polyurea cannot be painted by hand, and achieve excellent hygroscopic performance, high mechanical strength and strong antistatic property Effect

Inactive Publication Date: 2020-04-10
WUXI ACRYL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the high activity of this amine, it will react immediately when it comes into contact with isocyanate, so polyurea cannot be painted by hand, but special spraying equipment must be used

Method used

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  • Method for preparing polyurea coating modified with end-capped polyetheramine
  • Method for preparing polyurea coating modified with end-capped polyetheramine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing a modified polyurea coating with blocked polyetheramine comprises the following steps:

[0033] (1) Synthesis of ketimine: Add 35g of methyl isobutyl ketone into a 500mL three-neck flask equipped with a constant pressure dropping funnel, thermometer and stirrer, and add 200g of polyether dropwise when the temperature rises to 100°C Amine EDR-148, after the dropwise addition, the temperature is raised to 105-110°C, and the reaction is kept for 1-2 hours. Then remove the constant pressure dropping funnel, install a water separator, fill the water separator with methyl isobutyl ketone, an azeotropic solvent, raise the temperature and azeotrope, and control the water separation rate to 1-2 drops / second. Distillation under reduced pressure gave the ketimine when no more water flowed out.

[0034] (2) Preparation of polyurea coating: mix the isocyanate component and amino component in a molar ratio of 2:1, brush the obtained coating on the substrate at...

Embodiment 2

[0037] A method for preparing a modified polyurea coating with blocked polyetheramine comprises the following steps:

[0038] (1) Synthesis of ketimine: Add 35g of methyl isobutyl ketone into a 500mL three-neck flask equipped with a constant pressure dropping funnel, thermometer and stirrer, and add 180g of polyether after dehydration dropwise when the temperature rises to 100°C Amine EDR-176, after the dropwise addition, the temperature is raised to 105-110°C, and the reaction is kept for 1-2 hours. Then remove the constant pressure dropping funnel, install a water separator, fill the water separator with methyl isobutyl ketone, an azeotropic solvent, raise the temperature and azeotrope, and control the water separation rate to 1-2 drops / second. Distillation under reduced pressure gave the ketimine when no more water flowed out.

[0039](2) Preparation of polyurea coating: mix the isocyanate component and amino component in a molar ratio of 2:1, apply the obtained coating to...

Embodiment 3

[0042] A method for preparing a modified polyurea coating with blocked polyetheramine comprises the following steps:

[0043] (1) Synthesis of ketimine: Add 30g of acetone into a 500mL three-neck flask equipped with a constant pressure dropping funnel, thermometer and stirrer, and add 192g of polyetheramine EDR-192 dropwise when the temperature rises to 100°C. After the dropwise addition, the temperature was raised to 105-110°C, and the temperature was kept for 1-2 hours. Then remove the constant pressure dropping funnel, install the water separator, fill the water separator with acetone, the azeotropic solvent, raise the temperature and azeotrope, and control the water separation rate to 1-2 drops / second. Distillation under reduced pressure gave the ketimine when no more water flowed out.

[0044] (2) Preparation of polyurea coating: mix the isocyanate component and amino component in a molar ratio of 2:1, brush the obtained coating on the substrate at 25°C, and place it at ...

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Abstract

The invention relates to a method for preparing a polyurea coating modified with end-capped polyetheramine. The method includes a step of synthesizing ketimine by reacting ketone and polyetheramine; astep of reacting diisocyanate and the ketimine to obtain a polyurea material; and a step of subjecting the polyurea material to coating and constant-temperature curing to obtain the polyurea coatingmodified with end-capped polyetheramine. The end-capped polyetheramine is utilized in the method, and because of a characteristic (that the molecule contains an ether bond) of the polyetheramine itself, the polyurea material obtained by reacting the diisocyanate has high mechanical strength, excellent heat resistance, strong antistatic property, excellent moisture absorption performance, and the like. The reaction of the end-capped polyetheramine with isocyanate can change the severity of the reaction and reduce requirements for spraying equipment.

Description

technical field [0001] The invention relates to a method for preparing a polyurea coating modified with end-capped polyetheramine, in particular to a method for preparing a polyetheramine-modified polyurea material with moisture absorption and antistatic properties, and belongs to the technical field of polymer materials. Background technique [0002] Polyurea is a general term for a class of coatings composed of isocyanate components and amino components. It has excellent mechanical properties and is a new type of environmentally friendly polymer material that is currently developing rapidly. Polyetheramine (also known as amino-terminated polyether) is one of the main raw materials of polyurea, which is cheap and widely used. Compared with traditional polyurea coatings, modified polyurea coatings prepared with polyetheramines have high molecular weight, good toughness, good antistatic properties, excellent heat resistance, and excellent moisture absorption. At the same tim...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D5/24C08G18/50
CPCC08G18/5021C09D5/24C09D175/02
Inventor 张松林司义新潘萍张文泉黄佳斯
Owner WUXI ACRYL TECH
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