A kind of two-component polyurea coating and its spraying method

A two-component, polyurea technology, applied in the field of coatings, can solve problems such as difficult construction, long surface drying time of water-based coatings, and inability to improve the low-temperature performance of PVC slush-plastic skins.

Active Publication Date: 2020-03-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

Due to the low viscosity of pure water-based polyurethane coatings, it is easy to flow when spraying polyurethane coatings on the vertically suspended PVC slush skin, resulting in difficulty in construction; at the same time, the surface drying time of water-based coatings is longer, which greatly increases the construction period; When using an aromatic two-component polyurethane reactive coating or an aromatic two-component polyurethane coating, since the isocyanate component can react with the air or traces of moisture on the slush surface, it is necessary to ensure that the spraying is carried out in an environment with reduced humidity to prevent Sprayed coating blisters on the slush skin, limiting spraying conditions
CN107312438A discloses a kind of coating, specifically water-based polyurethane coating and color paste, film-forming aid, defoamer, wetting agent, thickener are compounded to improve the low-temperature blasting performance of PVC slush plastic skin, and the above-mentioned components After compounding, the construction performance of the coating is improved, but there is also the problem of a long time for water-based coatings to dry on the surface (for a coating with a thickness of 0.2mm, it takes 1 to 2 hours to dry to the surface), resulting in a long construction period.
Due to the different application requirements on PVC slush-molded skins, at present, the spray polyurea technology has not been applied to the PVC slush-molded skins of automobile dashboards, and the semi-polyurea or polyurea formulations and spraying technologies currently used in the automotive industry are also Can not meet the requirements of improving the low temperature performance of PVC slush skin

Method used

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  • A kind of two-component polyurea coating and its spraying method
  • A kind of two-component polyurea coating and its spraying method
  • A kind of two-component polyurea coating and its spraying method

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preparation example Construction

[0086] The present invention also provides a method for preparing the two-component polyurea coating described in the above technical solution, comprising the following steps:

[0087] a) reacting an aromatic isocyanate with a hydroxyl-terminated compound to obtain a main ingredient;

[0088] Or react aliphatic isocyanate with amino-terminated compound to obtain the main material;

[0089] b) mixing the main material with a diluent to obtain component A;

[0090] c) mixing the amino-terminated resin, amino-terminated chain extender, auxiliary agent and colorant to obtain component B;

[0091] d) Mixing and spraying the A component and the B component using a polyurea spraying equipment to obtain a polyurea coating;

[0092] Wherein, the step of obtaining component A and the step of obtaining component B are not limited in order.

[0093] Wherein, the types and dosages of the aromatic isocyanates, hydroxyl-terminated compounds, aliphatic isocyanates, amino-terminated compoun...

Embodiment 1

[0105] 1.1 Preparation and spraying of paint

[0106] The preparation of A component: in containing 45.6 parts by mass MDI-50 (a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, wherein the content of 2,4'-diphenylmethane diisocyanate is 50% to 54% , Wanhua Chemical Group Co., Ltd.) into the three-necked bottle, nitrogen was introduced, the temperature was raised to 50 ° C, and 24.7 parts by mass of polyoxypropylene ether triol (TMN-3050, Sinopec Asset Management Co., Ltd. Tianjin Petrochemical Branch) and 24.7 mass parts of low unsaturation polyoxypropylene ether polyol ( POLYOL4200, German Covestro company), after adding, be gradually warming up to 80 ℃, continue to react for 2~3 hours, then take a sample to determine that in the semi-prepolymer -NCO end group content is 13.8%; Mix the semi-prepolymer of 95wt% with 5wt% diluent 1,2-propylene glycol carbonate (trade name Jeffsol TM PC (U.S. Huntsman Company) was stirred evenly to obtain...

Embodiment 2

[0118] 1.1 Preparation and spraying of paint

[0119] 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 difunctional amino-terminated polyoxypropylene ether of 61 mass parts at room temperature ( D-2000, U.S. Huntsman Company), after the addition is completed, the temperature is gradually raised to 80° C., and the reaction is continued for 2 to 3 hours. Then, the content of —NCO end group in the semi-prepolymer is measured by sampling to be 12.1%, which is to obtain the A component. In a closed container, degassed and filled with nitrogen for later use.

[0120] Preparation of component B: 69.3wt% amino-terminated polyoxypropylene ether (48.4wt% difunctional amino-terminated polyoxypropylene ether D-2000 and 20.9 wt% trifunctional amino-terminated polyoxypropylene ether T-5000, U.S. Huntsman company), 26.2wt% amine chain extender ( D-230, U.S. Huntsman company...

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Abstract

The invention provides a two-component polyurea paint and a spraying method. The polyurea coating provided by the present invention is a two-component coating, including A component and B component; the main material in A component is prepared by reacting a specific isocyanate with a hydroxyl-terminated compound or an amino-terminated compound in a certain proportion, and the B component Contains amino-terminated resin and amino-terminated chain extender in a certain ratio. The polyurea coating of the present invention can better improve the low-temperature performance of the PVC slush-molded skin, and when the PVC slush-molded skin with the polyurea coating is blasted at low temperature, no fragmentation and splashing will occur; in addition, the gel of the polyurea coating of the present invention The time and surface drying time are short, which improves the production efficiency, and can ensure the appropriate hardness, so that the PVC slush-plastic skin will not be deformed due to too much hardness.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a two-component polyurea coating and a spraying method. Background technique [0002] Polyvinyl chloride (PVC) slush-plastic skin is widely used in the instrument panels of high-end cars, but the PVC slush-plastic skin becomes brittle under low temperature conditions. When the airbag is blasted at low temperature, the PVC slush-plastic skin is prone to cracking and splashing, which poses a safety hazard. At the same time, due to the constraints of high cost of slush-molded materials and low utilization rate of skin materials, for the slush-molded product manufacturing industry, slush-molded skin products are high-cost and low-profit products; if the thickness of PVC slush-molded skin is changed from the current 1.2 mm is reduced to about 0.8mm, and the cost of the skin material will be reduced by about 33.3%. Therefore, it is an inevitable trend in the development of the slush ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/02C09D175/14C09D5/32C09D7/48C09D7/63C08G18/66C08G18/48C08G18/50C08G18/32B05D7/02B05D7/24
Inventor 许东华石彤非潘鸽王晓伟付志磊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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