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Anti-yellowing powder coating for architectural decoration

A technology for powder coatings and architectural decoration, applied in the field of coatings, which can solve the problems of easy oxidative degradation of polymers, production of antagonistic effects, and yellowing.

Inactive Publication Date: 2020-04-28
王磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Architectural coatings exposed to the external environment or sunlight, with the accumulation of wind and sun, the polymers in the coating are easy to oxidize and degrade, which manifests as decreased gloss, fading, yellowing, chalking, and brittleness of the coating. , eventually causing the coating to peel off, thus losing its protective and decorative effect
[0003] In the prior art, UV absorbers or UV shielding agents are often added to coatings to resist sunlight exposure, but a single UV protection agent has limited absorption or shielding of ultraviolet light, so different types are used in combination. However, compounding is not simply a matter of simply mixing several kinds of anti-ultraviolet agents together, otherwise it may not only not produce synergistic effects, but may also produce antagonistic effects

Method used

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  • Anti-yellowing powder coating for architectural decoration
  • Anti-yellowing powder coating for architectural decoration
  • Anti-yellowing powder coating for architectural decoration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material methyl 3-hydroxycinnamate: cas:66417-46-7; purchased from Shanghai Shaoyuan Reagent Co., Ltd.;

[0028] Raw material 4-hydroxypiperidine: cas:5382-16-1; purchased from Shanghai Shaoyuan Reagent Co., Ltd.;

[0029] see Figure 1-2 Shown, the preparation method of anti-yellowing agent specifically comprises the following steps:

[0030] The first step, add 1mol 3-hydroxycinnamate methyl ester, 1.1mol 4-hydroxypiperidine, 12mmol catalyst tin tetrachloride and 4L solvent xylene in the reactor, pass into nitrogen to replace the air in the reactor, while Raise the temperature to 135°C while stirring, keep warm for transesterification reaction for 6 hours, after the reaction is completed, add activated carbon for thermal decolorization for 5 minutes, filter while hot, and use 30% DMF ether solution for recrystallization to obtain raw material a;

[0031] The second step, add 0.1mol cyanuric chloride, 200ml solvent chloroform, 0.3mol anhydrous AlCl in the reactio...

Embodiment 2

[0034] A kind of anti-yellowing powder coating that is used for building decoration, comprises the raw material of following weight: epoxy acrylate resin 75g, mica powder 10g, pigment filler (titanium dioxide) 20g, anti-yellowing agent 3.5g, leveling agent 1g, Precipitated barium sulfate 6g, benzoin 1g.

[0035] The Tg of epoxy acrylate resin is 49°C, the number average molecular weight is 12000, and the epoxy equivalent is 457;

[0036] The leveling agent is powder leveling agent RB505;

[0037] The preparation method of anti-yellowing powder coating is:

[0038] Put the raw materials of each component into a ball mill for grinding and mixing for 10 minutes. After mixing, put them into a twin-screw extruder for extrusion and tabletting. The extrusion temperature is 110°C in the first zone and 130°C in the second zone. The material is crushed and finely crushed, and sieved to obtain a yellowing-resistant powder coating with a particle size of 10-50 microns.

Embodiment 3

[0040] A kind of anti-yellowing powder coating that is used for building decoration, comprises the raw material of following weight: epoxy acrylate resin 65g, mica powder 12g, pigment and filler (titanium dioxide) 15g, anti-yellowing agent 4g, leveling agent 1g, precipitation Barium sulfate 3g, benzoin 2g.

[0041] The Tg of epoxy acrylate resin is 52°C, the number average molecular weight is 13000, and the epoxy equivalent is 512;

[0042] The leveling agent is powder leveling agent RB505;

[0043] The preparation method of anti-yellowing powder coating is:

[0044] Add the raw materials of each component to a ball mill for grinding and mixing for 15 minutes. After mixing, put them into a twin-screw extruder for extrusion and tabletting. The extrusion temperature is 105°C in the first zone and 125°C in the second zone. The material is crushed and finely crushed, and sieved to obtain a yellowing-resistant powder coating with a particle size of 10-50 microns.

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Abstract

The invention discloses anti-yellowing powder coating for architectural decoration. The coating is prepared from the following raw materials in parts by weight: 65 to 80 parts of epoxy acrylate resin,10 to 15 parts of mica powder, 15 to 20 parts of pigment filler, 3.5 to 5 parts of an anti-yellowing agent, 1 to 2 parts of a leveling agent, 3 to 6 parts of precipitated barium sulfate and 1 to 3 parts of benzoin. Epoxy acrylate resin is used as a matrix to prepare the anti-yellowing agent with the structure shown in the formula m, the same molecular structure of the anti-yellowing agent contains a triazine ring and hindered amine double-light-stabilizing functional groups, the effect of a light stabilizer can be improved, and the molecular utilization efficiency can be improved. After the coating is applied to the surface of a building, a coating can be kept not yellowed or pulverized for a long time, and the coating is suitable for decoration.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to an anti-yellowing powder coating for architectural decoration. Background technique [0002] Architectural decorative coatings mainly refer to a type of coating used for painting the interior walls and exterior walls of buildings, ceilings, floors, doors, windows, roofs, and all wooden and metal components. Architectural coatings exposed to the external environment or sunlight, with the accumulation of wind and sun, the polymers in the coating are easy to oxidize and degrade, which manifests as decreased gloss, fading, yellowing, chalking, and brittleness of the coating. , eventually causing the coating to peel off, thus losing its protective and decorative effect. [0003] In the prior art, UV absorbers or UV shielding agents are often added to coatings to resist sunlight exposure, but a single UV protection agent has limited absorption or shielding of ultraviolet light, so di...

Claims

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Application Information

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IPC IPC(8): C09D163/10C09D5/03C09D7/48C07D251/24
CPCC07D251/24C09D5/03C09D7/48C09D163/10C08K13/02C08K5/34926
Inventor 王磊江川
Owner 王磊
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