A high abrasion resistant polyester powder coating and a method for its preparation

Abstract

This invention relates to the field of powder coating technology, and proposes a high-abrasion-resistant polyester powder coating and its preparation method. The high-abrasion-resistant polyester powder coating comprises the following components in parts by weight: 50-80 parts polyester resin, 20-50 parts epoxy-cured polyester resin, 3-6 parts curing agent, 8-12 parts filler, 3-4 parts leveling agent, and 0.5-1 part defoamer; the acid value of the polyester resin is 20-55 mgKOH / g; and the acid value of the epoxy-cured polyester resin is 30-38 mgKOH / g. This technical solution solves the problem of poor abrasion resistance and adhesion of existing polyester powder coatings.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology, specifically to a high abrasion-resistant polyester powder coating and its preparation method. Background Technology

[0002] Powder coatings are solid powdered resin coatings composed of solid resin, fillers, and additives. During spraying, powder coatings use air as the dispersion medium, avoiding the potential harm to humans and the environment caused by traditional coatings that use liquid solvents. After spraying, the powder coating adheres to the substrate surface, gradually melts during heating, and then undergoes a chemical reaction to cross-link into a coating film. Polyester powder coatings, in particular, possess excellent weather resistance and decorative properties, playing a vital role in practical production. However, their relatively poor abrasion resistance and adhesion limit their further application. Summary of the Invention

[0003] This invention proposes a high wear-resistant polyester powder coating and its preparation method, which solves the problem of poor wear resistance and adhesion of polyester powder coatings in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a high wear-resistant polyester powder coating, comprising the following components in parts by weight: 50-80 parts polyester resin, 20-50 parts epoxy-cured polyester resin, 3-6 parts curing agent, 8-12 parts filler, 3-4 parts leveling agent, and 0.5-1 part defoamer.

[0006] The acid value of the polyester resin is 20~55 mgKOH / g; the acid value of the epoxy-cured polyester resin is 30~38 mgKOH / g.

[0007] As a further technical solution, the mass ratio of the polyester resin and the epoxy-cured polyester resin is 3:2 to 7:3.

[0008] In this invention, the wear resistance and adhesion of polyester powder coating are further improved by adjusting the mass ratio of polyester resin and epoxy-cured polyester resin.

[0009] As a further technical solution, the following components by weight are also included: 4 to 8 parts of ethylene-acrylic acid copolymer.

[0010] As a further technical solution, the ethylene-acrylic acid copolymer is one of EAA-6100, EAA-3004, EAA-3440, EAA-3460, and EAA-5980;

[0011] Preferably, the ethylene-acrylic acid copolymer is one of EAA-3460 and EAA-5980;

[0012] More preferably, the ethylene-acrylic acid copolymer is EAA-5980.

[0013] In this invention, an ethylene-acrylic acid copolymer component is introduced into the polyester powder coating, and the wear resistance of the polyester powder coating is further improved by adjusting the type of the acetic acid-acrylic acid copolymer.

[0014] As a further technical solution, the curing agent includes curing agent T31 and curing agent 593.

[0015] As a further technical solution, the mass ratio of curing agent T31 to curing agent 593 is 4:1~3.

[0016] As a further technical solution, the filler is one or more of silicon dioxide, calcium carbonate, zinc oxide, and titanium dioxide.

[0017] As a further technical solution, the leveling agent is one or both of TEGO 100 and TEGO 410.

[0018] As a further technical solution, the defoamer is one or more of BYK-054, BYK-055, BYK-057, and BYK-065.

[0019] As a further technical solution, the particle size of the high wear-resistant polyester powder coating is 150~180 mesh.

[0020] The present invention also proposes a method for preparing the high wear-resistant polyester powder coating, comprising the following steps: mixing the components of the high wear-resistant polyester powder coating, extruding and granulating, and crushing to obtain the high wear-resistant polyester powder coating.

[0021] The working principle and beneficial effects of this invention are as follows:

[0022] In this invention, a polyester resin with an acid value of 20~55mgKOH / g and an epoxy-cured polyester resin with an acid value of 30~38mgKOH / g are compounded to ensure that the two are fully combined. After the coating film is formed, peeling can be reduced, and the wear resistance and adhesion of the polyester powder coating are significantly improved. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] In the following examples and comparative examples, the polyester resin with an acid value of 20-24 mgKOH / g is designated as SJ4B-2; the polyester resin with an acid value of 48-55 mgKOH / g is designated as SJ5801; the polyester resin with an acid value of 70-80 mgKOH / g is designated as SJ4870; the polyester resin with an acid value of 16-24 mgKOH / g is designated as SJ5802; the epoxy-cured polyester resin with an acid value of 30-36 mgKOH / g is designated as SJ6BDT; the epoxy-cured polyester resin with an acid value of 33-38 mgKOH / g is designated as SJ6A; the epoxy-cured polyester resin with an acid value of 24-31 mgKOH / g is designated as SJ7208; and the epoxy-cured polyester resin with an acid value of 45-55 mgKOH / g is designated as SJ6805.

[0025] Example 1

[0026] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 50 parts of polyester resin with an acid value of 20~24 mgKOH / g, 50 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 2.7 parts of curing agent T31, 0.3 parts of curing agent 593, 8 parts of titanium dioxide, 3 parts of leveling agent TEGO 100, and 0.5 parts of defoamer BYK-054;

[0027] The preparation method of high abrasion-resistant polyester powder coating includes the following steps: mixing the components of high abrasion-resistant polyester powder coating, extruding and granulating, and crushing to obtain high abrasion-resistant polyester powder coating with a particle size of 180 mesh.

[0028] Example 2

[0029] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 80 parts of polyester resin with an acid value of 48~55 mgKOH / g, 20 parts of epoxy-cured polyester resin with an acid value of 33~38 mgKOH / g, 3.6 parts of curing agent T31, 0.4 parts of curing agent 593, 10 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, 0.5 parts of defoamer BYK-054, and 0.5 parts of defoamer BYK-057;

[0030] The preparation method of high wear-resistant polyester powder coating includes the following steps: mixing the components of high wear-resistant polyester powder coating, extruding and granulating, and crushing to obtain high wear-resistant polyester powder coating with a particle size of 200 mesh.

[0031] Example 3

[0032] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 50 parts of polyester resin with an acid value of 20~24 mgKOH / g, 50 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0033] The preparation method of high abrasion-resistant polyester powder coating includes the following steps: mixing the components of high abrasion-resistant polyester powder coating, extruding and granulating, and crushing to obtain high abrasion-resistant polyester powder coating with a particle size of 180 mesh.

[0034] Example 4

[0035] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 80 parts of polyester resin with an acid value of 20~24 mgKOH / g, 20 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0036] The preparation method is the same as in Example 3.

[0037] Example 5

[0038] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 60 parts of polyester resin with an acid value of 20~24 mgKOH / g, 40 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0039] The preparation method is the same as in Example 3.

[0040] Example 6

[0041] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 70 parts of polyester resin with an acid value of 20~24 mgKOH / g, 30 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0042] The preparation method is the same as in Example 3.

[0043] Example 7

[0044] The only difference between this embodiment and Embodiment 6 is that the high abrasion-resistant polyester powder coating also includes the following components in parts by weight: 4 parts of EAA-6100;

[0045] The preparation method of high abrasion-resistant polyester powder coating includes the following steps: mixing the components of high abrasion-resistant polyester powder coating, extruding and granulating, and crushing to obtain high abrasion-resistant polyester powder coating with a particle size of 180 mesh.

[0046] Example 8

[0047] The only difference between this embodiment and Embodiment 6 is that the high abrasion-resistant polyester powder coating also includes the following components in parts by weight: 8 parts of EAA-6100;

[0048] The preparation method is the same as in Example 7.

[0049] Example 9

[0050] The only difference between this embodiment and Embodiment 6 is that the high abrasion-resistant polyester powder coating also includes the following components in parts by weight: 8 parts of EAA-3460;

[0051] The preparation method is the same as in Example 7.

[0052] Example 10

[0053] The only difference between this embodiment and Embodiment 6 is that the high abrasion-resistant polyester powder coating also includes the following components in parts by weight: 8 parts of EAA-3004;

[0054] The preparation method is the same as in Example 7.

[0055] Example 11

[0056] The only difference between this embodiment and Embodiment 6 is that the high abrasion-resistant polyester powder coating also includes the following components in parts by weight: 8 parts of ethylene EAA-5980;

[0057] The preparation method is the same as in Example 7.

[0058] Example 12

[0059] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 70 parts of polyester resin with an acid value of 20~24 mgKOH / g, 30 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 3 parts of curing agent T31, 3 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, 1 part of defoamer BYK-054, and 8 parts of EAA-5980;

[0060] The preparation method is the same as in Example 11.

[0061] Example 13

[0062] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 70 parts of polyester resin with an acid value of 20~24 mgKOH / g, 30 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 4.8 parts of curing agent T31, 1.2 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, 1 part of defoamer BYK-054, and 8 parts of EAA-5980;

[0063] The preparation method is the same as in Example 11.

[0064] Example 14

[0065] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 70 parts of polyester resin with an acid value of 20~24 mgKOH / g, 30 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 3.4 parts of curing agent T31, 2.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, 1 part of defoamer BYK-054, and 8 parts of EAA-5980;

[0066] The preparation method is the same as in Example 11.

[0067] Comparative Example 1

[0068] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 50 parts of polyester resin with an acid value of 70~80mgKOH / g, 50 parts of epoxy-cured polyester resin with an acid value of 30~36mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0069] The preparation method is the same as in Example 3.

[0070] Comparative Example 2

[0071] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 50 parts of polyester resin with an acid value of 16~24 mgKOH / g, 50 parts of epoxy-cured polyester resin with an acid value of 30~36 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0072] The preparation method is the same as in Example 3.

[0073] Comparative Example 3

[0074] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 50 parts of polyester resin with an acid value of 20~24 mgKOH / g, 50 parts of epoxy-cured polyester resin with an acid value of 24~31 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0075] The preparation method is the same as in Example 3.

[0076] Comparative Example 4

[0077] High abrasion resistant polyester powder coating comprises the following components in parts by weight: 50 parts of polyester resin with an acid value of 20~24 mgKOH / g, 50 parts of epoxy-cured polyester resin with an acid value of 45~55 mgKOH / g, 5.4 parts of curing agent T31, 0.6 parts of curing agent 593, 12 parts of titanium dioxide, 4 parts of leveling agent TEGO 100, and 1 part of defoamer BYK-054;

[0078] The preparation method is the same as in Example 3.

[0079] The abrasion resistance of the polyester powder coatings prepared in Examples 1-14 and Comparative Examples 1-4 was tested according to the standard GB / T 23988-2009 "Determination of Abrasion Resistance of Coatings - Falling Sand Method". The test results are shown in Table 1.

[0080] Table 1 Abrasion resistance test results

[0081]

[0082] By comparing the data of Examples 1-14 and Comparative Examples 1-4, it was found that the polyester powder coatings prepared in Examples 1-14 had higher wear resistance than those in Comparative Examples 1-4. This indicates that the use of polyester resin with an acid value of 20-55 mgKOH / g and epoxy-cured polyester resin with an acid value of 30-38 mgKOH / g can significantly improve the wear resistance of polyester powder coatings.

[0083] By comparing the data from Examples 3 to 6, it was found that the polyester powder coatings prepared in Examples 5 to 6 had higher wear resistance than those in Examples 3 to 4. This indicates that by adjusting the mass ratio of polyester resin and epoxy-cured polyester resin, the wear resistance of polyester powder coatings can be further improved.

[0084] Comparing the data from Examples 7-11, it was found that the polyester powder coatings prepared in Examples 9-11 had higher wear resistance than those in Examples 7-8. This indicates that the introduction of the ethylene-acrylic acid copolymer component into the polyester powder coating and the adjustment of the type of the acetic acid-acrylic acid copolymer further improved the wear resistance of the polyester powder coating.

[0085] By comparing the data from Examples 11 to 14, it was found that the polyester powder coatings prepared in Examples 13 to 14 had higher wear resistance than those in Examples 11 to 12. This indicates that adjusting the mass ratio of curing agent T31 to curing agent 593 to 4:1 to 3 can further improve the wear resistance of the polyester powder coating.

[0086] The adhesion of the polyester powder coatings prepared in Examples 3 to 6 was tested according to the standard GB / T 9286-2021 "Cross-cut test for paints and varnishes". The test results are shown in Table 2.

[0087] Table 2 Adhesion Test Results

[0088]

[0089] By comparing the data of Examples 3-6 and Comparative Examples 1-4, it was found that the polyester powder coatings prepared in Examples 3-6 had a higher adhesion grade than those in Comparative Examples 1-4. This indicates that the combination of polyester resin with an acid value of 20-55 mgKOH / g and epoxy-cured polyester resin with an acid value of 30-38 mgKOH / g can significantly improve the adhesion of polyester powder coatings.

[0090] By comparing the data from Examples 3 to 6, it was found that the polyester powder coatings prepared in Examples 5 to 6 had a higher adhesion grade than those in Examples 3 to 4. This indicates that by adjusting the mass ratio of polyester resin and epoxy-cured polyester resin, the adhesion of polyester powder coatings can be further improved.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high abrasion-resistant polyester powder coating, characterized in that, It is composed of the following components in parts by weight: 50-80 parts polyester resin, 20-50 parts epoxy-cured polyester resin, 3-6 parts curing agent, 8-12 parts filler, 3-4 parts leveling agent, 0.5-1 part defoamer, and 4-8 parts ethylene-acrylic acid copolymer; The polyester resin has an acid value of 20~24 mgKOH / g and is designated as SJ4B-2; the epoxy-cured polyester resin has an acid value of 30~36 mgKOH / g and is designated as SJ6BDT. The mass ratio of the polyester resin to the epoxy-cured polyester resin is 3:2 to 7:3; The curing agent includes curing agent T31 and curing agent 593 in a mass ratio of 4:1~3; The ethylene-acrylic acid copolymer is one of EAA-6100, EAA-3004, EAA-3440, EAA-3460, and EAA-5980.

2. The high abrasion-resistant polyester powder coating according to claim 1, characterized in that, The filler is one or more of silicon dioxide, calcium carbonate, zinc oxide, and titanium dioxide.

3. The high abrasion-resistant polyester powder coating according to claim 1, characterized in that, The defoamer is one or more of BYK-054, BYK-055, BYK-057, and BYK-065.

4. The high abrasion-resistant polyester powder coating according to claim 1, characterized in that, The particle size of the high wear-resistant polyester powder coating is 150~180 mesh.

5. A method for preparing a high abrasion-resistant polyester powder coating according to any one of claims 1 to 4, characterized in that, The process includes the following steps: mixing the components of the high abrasion-resistant polyester powder coating, extruding and granulating the mixture, and then crushing it to obtain the high abrasion-resistant polyester powder coating.

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