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Two-component polyurea coating and application thereof

A two-component, polyurea technology, used in polyurea/polyurethane coatings, coatings, devices for coating liquids on surfaces, etc. The effect of wiping performance, fast surface drying, and low VOC content

Inactive Publication Date: 2019-12-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the coating material sprayed on the polypropylene bumper has to meet various tests such as appearance, adhesion, high pressure cleaning resistance, stone impact resistance and abrasion resistance, at present, the spray polyurea technology has not been applied to the non-sprayed any paint Modified polypropylene bumper, and the polyurea formulation and its spraying method used in the automotive industry in the prior art can not meet the requirements for the coating of the automotive bumper

Method used

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  • Two-component polyurea coating and application thereof
  • Two-component polyurea coating and application thereof
  • Two-component polyurea coating and application thereof

Examples

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preparation example Construction

[0075] The present invention also provides a method for preparing the two-component polyurea coating described in the above technical solution, comprising the following steps:

[0076] a) mixing and reacting the main material with the diluent to obtain component A;

[0077] b) Grinding after mixing the amino-terminated polyether, amino-terminated chain extender, auxiliary agent and colorant to obtain component B;

[0078] c) mixing component A obtained in step a) with component B obtained in step b) to obtain a two-component polyurea coating;

[0079] The steps a) and b) are not limited in sequence.

[0080] In the present invention, the main material and the diluent are stirred until uniform to obtain the A component. In the present invention, the main material and the diluent are the same as those described in the above technical solution, and will not be repeated here. The present invention has no special limitation on the process of stirring until uniform; after obtaini...

Embodiment 1

[0099] Preparation of Aromatic Single-layer Polyurea Coatings

[0100] (1) Preparation of component A: In a three-necked bottle containing 58.2 parts by weight of 4,4'-MDI (Lupranate MI, BASF, Germany), nitrogen gas was introduced, the temperature was raised to 50°C, and 6.6 parts by weight of The polyε-caprolactone polyol (PlaccelL205AL, Nippon Chemical Industry Co., Ltd. Daicel Company) and the polyether diol (Acclaim 2200, U.S. Arco Company) of 28.7 parts by weight are gradually warming up to 80° C. after adding, Continue to react for 2h to 3h to obtain a semi-prepolymer;

[0101] Sampling and determination of NCO% content in the semi-prepolymer is 18.4%;

[0102] Then the semi-prepolymer of 93.5wt% and the diluent propylene carbonate of 6.5wt% (trade name ArconatePC, Holland LyondellBasell company) are stirred evenly, obtain A component; Be placed in airtight container, degassing and nitrogen filling stand-by.

[0103] (2) Preparation of component B: 62.5 wt% of amino-t...

Embodiment 2

[0106] Preparation of Aliphatic Single-layer Polyurea Coatings

[0107] (1) The preparation of A component: in the isophorone diisocyanate ( IPDI, in the there-necked flask of Evonik Degussa Company of Germany), feed nitrogen, drop the amino-terminated polyether (the copolyetherdiamine of the difunctionality of 20wt% of 41 weight parts at room temperature) THF-170, American Huntsman Company and 21wt% difunctional amino-terminated polyether BASF D2000, German BASF Company), after the addition is completed, the temperature is gradually raised to 80 ° C, and the reaction is continued for 2h to 3h to obtain a semi-prepolymer;

[0108] Sampling and determination of NCO% content in the semi-prepolymer is 19.7%;

[0109] Then after the semi-prepolymer of 96wt% and the diluent propylene carbonate of 4wt% (trade name Arconate PC, Holland LyondellBasell company) are stirred, obtain A component; After stirring, be A component; In a closed container, degassed and filled with nitrogen ...

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Abstract

The invention provides a two-component polyurea coating. The two-component polyurea coating comprises a component A and a component B at a volume ratio of 1: 1, wherein the component A comprises the following components in percentage by weight: 90wt%-100wt% of a semi-prepolymer; 0 to 10 wt% of a diluent; the semi-prepolymer is prepared from an aromatic isocyanate and a hydroxyl-terminated compound, or is prepared from an aliphatic isocyanate and an amino-terminated compound; the component B comprises the following components in percentage by weight: 40 to 75wt% of an amine-terminated polyether; 10 wt%-50 wt% of an amino-terminated chain extender; 0-10 wt% of an auxiliary agent; 0-30 wt% of a pigment; the isocyanate index of the two-component polyurea coating is 1.0 to 1.1. Compared with the prior art, the advantages are that: the bi-component polyurea coating provided by the invention contains specific content components; preferable interaction effect is achieved; the two-component polyurea coating can be used for direct spraying coating onto modified polypropylene bumpers treated through flame treatment and / or primer treatment, and coating layers obtained by spraying can pass alltests of automobile bumper coating and meet the requirements of the coating for automobile bumpers.

Description

technical field [0001] The invention relates to the technical field of composite material coatings, in particular to a two-component polyurea coating and its application. Background technique [0002] The front and rear ends of the car are equipped with a bumper, which not only has a decorative function, but more importantly, it is a safety device that absorbs and moderates external impact, and protects the body and occupants. With the development of the automobile industry and the extensive application of engineering plastics in the automobile industry, automobile bumpers, as an important safety device, are also on the road of innovation. With the formation of the automotive industry's pursuit of lightweight trends, car bumpers are currently mainly made of plastic. Modified polypropylene (PP) materials are widely used in the field of automobile bumpers due to their light weight, excellent heat resistance, weather resistance, excellent impact strength, tensile strength and ...

Claims

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Application Information

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IPC IPC(8): C09D175/02C08G18/66C08G18/48C08G18/50C08G18/42C08G18/32B05D1/02B05D3/08B05D7/02B05D7/24B05D7/00
CPCB05D1/02B05D3/08B05D7/02B05D7/24B05D7/54C08G18/324C08G18/4277C08G18/4825C08G18/5024C08G18/6618C09D175/02
Inventor 许东华刘芳李双双石彤非付志磊潘鸽杨雪赵志刚
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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