A kind of self-healing powder coating based on polyurethane resin and preparation method thereof

A polyurethane resin and powder coating technology, which is applied in polyurea/polyurethane coatings, powder coatings, anti-corrosion coatings, etc., can solve the problems of reduced repair effect and low crosslinking degree of cured coating film, so as to improve heat resistance and coating The effect of easy cleaning and excellent self-healing performance

Active Publication Date: 2022-07-22
ANHUI HUAHUI SUYE TECH SHARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating film prepared by the powder coating has excellent adhesion to the electrophoretic primer and top coat, and has a smooth coating film with strong self-healing function; but its crosslinking degree in the cured coating film is low, and it is chemically The function realizes self-repair, and the repair effect will be greatly reduced with the increase of repair times

Method used

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  • A kind of self-healing powder coating based on polyurethane resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The preparation method of the powder coating comprises the following steps:

[0037] The first step is to weigh each raw material according to the parts by weight and add it to the mixing tank, and stir for 4-6min under the condition of rotating speed 400r / min;

[0038] In the second step, the mixture is poured into a twin-screw extruder, melt extruded, and the heating conditions of the extruder are 110°C in zone I and 125°C in zone II;

[0039] The third step, after the extrusion is completed, cool down to room temperature, and send it to the pulverizer for grinding. The grinding conditions are 8500-9500r / min for the main mill and 6500-7500r / min for the auxiliary mill, and pass through a 180-mesh sieve to obtain powder. coating.

Embodiment 1

[0041] A self-healing powder coating based on polyurethane resin is prepared from the following raw materials in parts by weight: 50 parts of modified polyurethane resin, 6 parts of silicon-modified hydroxy acrylic resin, 10 parts of curing agent, 1 part of leveling agent, and 0.5 part of brightener , 0.2 parts of curing accelerator, 20 parts of composite filler;

[0042] The powder coating is made by the following steps:

[0043] The first step is to weigh each raw material according to the parts by weight and add it to the mixing tank, and stir for 4min under the condition of a rotating speed of 400r / min;

[0044] In the second step, the mixture is poured into a twin-screw extruder, melt extruded, and the heating conditions of the extruder are 110°C in zone I and 125°C in zone II;

[0045] The third step, after the extrusion is completed, cool to normal temperature, send it to the pulverizer for grinding, and the grinding conditions are 8500r / min for the main mill and 6500r...

Embodiment 2

[0047] A self-healing powder coating based on polyurethane resin is prepared from the following raw materials in parts by weight: 55 parts of modified polyurethane resin, 7 parts of silicon-modified hydroxy acrylic resin, 12 parts of curing agent, 1.2 parts of leveling agent, and 0.55 parts of brightener , 0.25 parts of curing accelerator, 23 parts of composite filler;

[0048] The powder coating is made by the following steps:

[0049] The first step is to weigh each raw material according to the parts by weight and add it to the mixing tank, and stir for 5min under the condition of rotating speed 400r / min;

[0050] In the second step, the mixture is poured into a twin-screw extruder, melt extruded, and the heating conditions of the extruder are 110°C in zone I and 125°C in zone II;

[0051] The third step, after the extrusion is completed, cool to room temperature, send it to the pulverizer for grinding, and the grinding conditions are 9000r / min for the main mill and 7000r / ...

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Abstract

The invention discloses a self-healing powder coating based on polyurethane resin, which is prepared from the following raw materials in parts by weight: 50-60 parts of modified polyurethane resin, 6-8 parts of silicon-modified hydroxy acrylic resin, 10-14 parts of curing agent, 1-1.4 parts of a leveling agent, 0.5-0.6 parts of a brightening agent, 0.2-0.3 parts of a curing accelerator, and 20-26 parts of a composite filler; the invention also discloses a preparation method of the powder coating. By using the modified polyurethane resin as the film-forming material, the present invention not only has high heat resistance, but also can realize repeated self-repair at room temperature, and the self-repair effect will not decrease with the increase of the repair times; Incorporating composite fillers into powder coatings can not only be uniformly dispersed in the polyurethane matrix, but also have a strong interaction with the matrix to improve the heat resistance, corrosion resistance and mechanical properties of the coating; Silicon modified hydroxy acrylic resin It can also provide easy-to-clean and anti-graffiti properties of the coating.

Description

technical field [0001] The invention belongs to the field of powder coatings, in particular to a self-healing powder coating based on polyurethane resin and a preparation method thereof. Background technique [0002] With the development of economy, especially the development of automobile industry, shipbuilding industry, construction industry and home decoration industry, functional coatings such as self-cleaning coatings, anti-reflection coatings, anti-corrosion coatings and antibacterial coatings, etc., have become the hot spots of material science research at home and abroad . Among them, self-healing powder coatings have attracted much attention because they can self-repair the cracks in the coating caused by external force and effectively prolong the service life of the coating. [0003] The powder coating for car body coating disclosed in Chinese patent application CN201510349629.1 and its preparation method, the powder coating for car body coating, in terms of weigh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D133/04C09D5/03C09D5/08C09D5/25C09D5/16C09D7/62C08G18/66C08G18/48C08G18/42C08G18/32
CPCC09D175/08C09D5/033C09D5/08C09D5/00C09D5/18C09D5/1662C09D5/1687C08G18/6618C08G18/4018C08G18/4854C08G18/42C08G18/3243C08K2201/011C08K2003/2227C08K2003/328C08L2201/08C08L33/04C08K9/10C08K7/00C08K3/32C08K3/22
Inventor 费邦忠周正华查全达费安道
Owner ANHUI HUAHUI SUYE TECH SHARE CO LTD
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