Smooth, scratch-resistant, matte and anti-bending polyurethane powder coating
A polyurethane powder, powder coating technology, applied in polyurea/polyurethane coatings, powder coatings, coatings, etc., can solve the problems of poor extinction, insufficient adhesion and flexibility, affecting product quality and effect, etc.
Inactive Publication Date: 2019-09-27
佛山市和俊美辰涂料科技有限公司
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0003] Polyurethane is relatively brittle after heating, and lack of flexibility is a common problem of polyurethane. This will cause the product to be unable to bend after the polyurethane powder coating is sprayed. Bending will cause cracks to form on the surface of the product, affecting the quality and effect of the product.
Moreover, the traditional low-temperature curing powder coating does not have scratch resistance due to its loose texture, and due to poor matting, it cannot achieve a matte effect. It is impossible to achieve the purpose of smoothness and matte at the same time. , and when the carrier carrying the powder coating is bent, the existing polyurethane powder coating will break due to insufficient adhesion and flexibility, failing to achieve the purpose of anti-bending
Method used
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Experimental program
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Embodiment 1
[0019] A smooth anti-scratch, matte anti-bending polyurethane powder coating of the present embodiment is made of the following raw materials in parts by mass:
[0020]
[0021] This embodiment also provides a method for preparing a smooth and scratch-resistant, matte and anti-bending polyurethane powder coating, comprising the steps of:
[0022] S1: dry mixing powder coating raw materials;
[0023] S2: Put the raw materials after dry mixing into the first zone of the extruder, the temperature of the first zone of the extruder is 95-105 degrees Celsius, melt and knead the raw materials in the first zone of the extruder, and the raw materials after melting and kneading enter the extrusion In the second zone of the extruder, the temperature in the second zone of the extruder is 105 degrees Celsius to 115 degrees Celsius. In the second zone of the extruder, the raw materials are sheared by the extruder screw to form a molten mixture;
[0024] S3: Pressing and cooling the molt...
Embodiment 2
[0039] A smooth anti-scratch, matte anti-bending polyurethane powder coating of the present embodiment is made of the following raw materials in parts by mass:
[0040]
[0041]
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Abstract
The invention relates to the field of chemical powder coatings, and especially to a smooth, scratch-resistant, matte and anti-bending polyurethane powder coating. The formula of the powder coating includes a hydroxy-terminated polyester resin with a high hydroxyl value, porous powder quartz, an isocyanate curing agents, benzoin, an acrylate leveling agent, a hydroxy-terminated polyester resin with a low hydroxyl value, a pigment and filler, and triglycidyl isocyanurate. When the powder coating with the formula is sprayed and the temperature in an oven reaches about 170 DEG C, the isocyanate curing agent simultaneously reacts with the hydroxy-terminated polyester resin with the high hydroxyl value and the hydroxy-terminated polyester resin with the low hydroxyl value, and the hydroxy-terminated polyester resin with the high hydroxyl value reacts more quickly and forms a smooth surface at the microscopic level; and when the temperature reaches 180 DEG C, carboxyl groups in the hydroxyl-terminated polyester resins react with the triglycidyl isocyanurate, so the smooth surface formed at the microscopic level is broken, and microscopic pinholes are generated to afresh form a new matte surface in order to achieve the matte effect.
Description
【Technical field】 [0001] The invention relates to the field of chemical powder coatings, in particular to a smooth, scratch-resistant, matte and bending-resistant polyurethane powder coating. 【Background technique】 [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the characteristics of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. In recent years, low-temperature curing powder coatings have begun to emerge, especially for some thicker substrates and special substrates. [0003] Polyurethane will be relatively brittle after heating, and lack of flexi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C09D175/06C09D5/03C09D7/61C09D7/63C08G18/42
CPCC08G18/4202C09D5/033C09D7/61C09D7/63C09D7/70C09D175/06C08K5/34924C08K7/26C08K5/07
Inventor 汪财运陈锋汪千涵朱洪涛
Owner 佛山市和俊美辰涂料科技有限公司