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Polyurethane prepolymer, polyurea material, preparation method and application thereof

A polyurethane prepolymer, polyurea technology, applied in the direction of polyurea/polyurethane coatings, radiation-absorbing coatings, coatings, etc., can solve the problems of low filling, poor adhesion, poor flexibility, etc., and achieve impact resistance. The effect of high strength, large coating thickness and strong adhesion

Active Publication Date: 2021-01-12
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polyurethane has good flexibility and impact resistance, but the filling amount is low. Chinese patent CN 103059799 A uses synthetic polyurethane and polyhydroxyl epoxy resin as the binder of electromagnetic wave protective coating, and the mass filling amount of its iron-based powder is 80 %, adhesion is 15.39MPa, impact strength is 50kg cm, and flexibility is 2mm, but the thickness of the coating is not specified. As the thickness of the coating increases, the mechanical properties will deteriorate, and the mechanical properties of the coating will increase with the content of iron-based powder will also deteriorate
Chlorosulfonated polyethylene has good flexibility, but poor adhesion; epoxy resin has high adhesion and high powder filling, but has the problems of poor flexibility and poor impact resistance

Method used

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Examples

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Effect test

preparation example Construction

[0023] The present embodiment provides a kind of polyurethane prepolymer, and its preparation method comprises the following steps:

[0024] Step S1: mixing the polymer polyol and the micro-branched polyester polyol in a reaction vessel, and removing water under vacuum.

[0025] Preferably, the polymer polyol includes polymer diol, and the polymer diol is selected from one or more of adipate-based polyester diol, polycaprolactone diol, or polycarbonate diol. Optionally, the number average molecular weight of the polymer polyol is 1250-2000, or 1400-1800, or 1500-1600.

[0026] Micro-branched polyester polyol refers to a saturated polyester containing two or more terminal hydroxyl groups. Optionally, the hydroxyl content of the micro-branched polyester polyol is 6.4-18%, or 8-15%, or 10-13%.

[0027] Preferably, the mass ratio between the hydroxyl groups in the polymer polyol and the hydroxyl groups in the micro-branched polyester polyol is 1-1.5:1, or 1.1-1.4:1, or 1.2-1.3:1...

Embodiment 1

[0049] The present embodiment provides a kind of polyurethane prepolymer, and its preparation method comprises:

[0050] Add 25kg of polycaprolactone diol with a number average molecular weight of 2000 and 3.54kg of branched polyester polyol with a hydroxyl content of 18% into the reaction kettle, and remove the polyol by vacuuming at a temperature of 105°C for 120min at a vacuum degree of 650Pa of water. Lower the temperature to 60°C, and add 11.14kg of toluene diisocyanate with an isocyanate index of 2.05 and 7.83kg of xylene to the reactor. After the temperature of the material is stabilized, the reaction time is 4 hours at a temperature of 80°C. After the reaction is completed, that is Obtain polyurethane prepolymer.

[0051] This embodiment also provides a kind of polyurea material, and its preparation method comprises:

[0052] To the above-prepared polyurethane prepolymer, 34.43 kg of toluene, 35.21 kg of xylene, and 8.6 kg of cyclohexanone were sequentially added, an...

Embodiment 2

[0057] The present embodiment provides a kind of polyurethane prepolymer, and its preparation method comprises:

[0058] Add 20kg of polycaprolactone diol with a number average molecular weight of 1250 and 12.75kg of branched polyester polyol with a hydroxyl content of 6.4% into the reaction kettle, set the temperature at 108°C, and vacuum for 3 hours at a vacuum degree of 600Pa to remove the polyol. of water. Lower the temperature to 40°C, and the stirring frequency is 35Hz. Add 12.87kg of toluene diisocyanate with an isocyanate index of 1.85 and 11.4kg of toluene to the reaction kettle. After finishing, the polyurethane prepolymer is obtained.

[0059] This embodiment also provides a kind of polyurea material, and its preparation method comprises:

[0060] In the polyurethane prepolymer prepared above, 14.93 kg of ethyl acetate, 14.93 kg of methyl ethyl ketone, 29.87 kg of xylene, and 14.93 kg of propylene glycol methyl ether acetate were sequentially added, and stirred ev...

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Abstract

The invention provides a polyurethane prepolymer, polyurea material and preparation methods and applications thereof and belongs to the field of high-polymer materials. The preparation method of the polyurethane prepolymer comprises mixing polyopolyols and micro-branched polyester polyols in a reaction container, eliminating water under vacuum, and then adding toluene diisocynate and solvent into the reaction container for reaction at 70-80 DEG C for 3-4 h. The preparation method of the polyurea material comprises mixing diamine, antioxygen and mixture solvent to obtain a mixture and mixing the polyurethane prepolymer with the mixture at a weight ratio of 100:23-45. The polyurea material is high filling amount of iron-based powder, large in coating thickness, high in adhesion force, good in flexibility and high in impact resistance.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyurethane prepolymer, a polyurea material and a preparation method and use thereof. Background technique [0002] With the rapid development of various wireless communication technologies, electromagnetic radiation is ubiquitous, especially in large and medium-sized cities where people live intensively. Long-term exposure to high-frequency electromagnetic radiation will have many adverse effects on human health. Therefore, how to provide effective electromagnetic protection for related electronic components, electronic equipment, ships, vehicles, buildings, etc. has become one of the most researched technical issues at present. [0003] To solve the problem of electromagnetic radiation interference, the widely used material is electromagnetic wave protective coating. The electromagnetic wave protective coating is mainly composed of iron-based powder or its alloy powder, mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/42C08G18/44C08G18/10C08G18/32C09D175/02C09D5/32
CPCC08G18/10C08G18/42C08G18/4202C08G18/425C08G18/4277C08G18/44C08G18/7614C08K3/18C09D5/32C09D175/02C08G18/3876C08G18/324C08G18/3243C08G18/3814
Inventor 周金向丁铁伢魏凌云袁芝金
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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