Outdoor mirror surface powder coating, preparation method thereof and coating formed by outdoor mirror surface powder coating

A powder coating, outdoor technology, used in powder coatings, coatings, polyester coatings, etc., can solve the problem of difficult to achieve replacement in the field

CN114231135APending Publication Date: 2022-03-25ANHUI SHENJIAN NEW MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-03-25

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Abstract

The invention discloses an outdoor mirror surface powder coating, a preparation method thereof and a coating formed by the outdoor mirror surface powder coating. The outdoor mirror surface powder coating comprises the following raw materials in percentage by weight: 65-85% of carboxyl-terminated polyester resin A; 6-15% of hydroxyl-terminated crystalline resin B; 5 to 8.5% of triglycidyl isocyanurate; 1.5 to 4% of blocked isocyanate; 0.8%-1.2% of a flatting agent; 0.5 to 10 percent of pigment; 0-3% of an inorganic filler; 0-1% wt of an auxiliary agent; the outdoor mirror surface powder coating is prepared in a co-extrusion mode of the low-viscosity carboxyl-terminated polyester resin A and the low-viscosity hydroxyl-terminated crystalline resin B, the leveling level PCI of the coating surface after baking and curing ranges from 9 to 10, the bending performance and the impact performance are excellent while the leveling effect is close to the mirror surface effect, and replacement of paint and water-based paint is achieved.
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Description

technical field

[0001] The invention belongs to the technical field of powder coatings, and in particular relates to an outdoor mirror powder coating, a preparation method thereof and a coating formed by the coating. Background technique

[0002] Powder coating is a solid powder synthetic resin coating composed of solid resin and pigments, fillers and additives. Unlike ordinary solvent-based paints and water-based paints, its dispersion medium is not solvent and water, but air. It has the characteristics of no solvent pollution, 100% film formation, and low energy consumption. Therefore, it has already realized the substitution of paint in many fields such as building materials, construction machinery, furniture and home appliances.

[0003] However, because powder coatings need to go through a high-temperature melting, cross-linking and curing process, their leveling is lower than that of paints, and it is difficult to replace them in some areas that require leveling. The...

Examples

Embodiment

[0047] Polyester resin A

[0048]Put the polyols, aromatic acids and catalysts in the formula in Table 1 into the reaction kettle at the same time, slowly raise the temperature to 235-255°C in a nitrogen atmosphere and maintain it. After the system is clarified, take a sample to detect the acid value (AV) to reach 5-20mgKOH / Add a secondary acidolysis agent when the resin is gram and maintain the temperature at 235-250°C for acid-decapping for about 1.5-2 hours. When the acid value of the polyester is 38-42mgKOH / g resin, cool down to 215-230°C and polycondense in vacuum (~0.1MPA) for a period of time, so that the acid value of the polyester reaches 28-34mgKOH / g resin, and the viscosity is 1500-2500mPa.S / 200°C. Then cool down to 180-225°C and discharge. Wherein resin a, b and c are examples, and d is a comparative example.

[0049] Table 1 Polyester resin A raw material formula, control acid value and performance in the production process

[0050]

[0051]

[0052] C...