CN115058139A

CN115058139A - Application of gloss stabilizer in HAA system extinction powder coating

Info

Publication number: CN115058139A
Application number: CN202210782012.9A
Authority: CN
Inventors: 张皓; 李卓衡; 赵啟; 赵成成; 徐斌; 童乃斌
Original assignee: Anhui Huaan Import And Export Co ltd
Current assignee: Anhui Huaan Import And Export Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-09-16

Abstract

The invention belongs to the technical field of powder coatings, and provides an application of a gloss stabilizer in a HAA system extinction powder coating. The HAA system extinction powder coating provided by the invention comprises the following components in percentage by weight: 25-35% of semi-crystalline carboxyl polyester resin, 25-35% of random carboxyl polyester resin, 3-4% of hydroxyalkyl amide curing agent, 0.5-2% of gloss stabilizer and 30-38% of pigment and/or additive; the gloss stabilizer is a fatty acid amide compound and/or a polyallylamine derivative. The invention takes the fatty acid amide compound and/or the polyallylamine derivative as the gloss stabilizer, can eliminate the defect of pattern bloom of HAA system extinction powder coating prepared by the resin extinction technology while reducing the gloss sensitivity, and enhances the application effect of the resin extinction technology.

Description

Application of gloss stabilizer in HAA system extinction powder coating

Technical Field

The invention relates to the technical field of powder coatings, in particular to an application of a gloss stabilizer in a HAA system extinction powder coating.

Background

The HAA system powder coating is an outdoor weather-resistant powder coating with good comprehensive performance, and the powder coating refers to a powder coating system which takes carboxyl polyester as a main film forming substance and a hydroxyalkylamide compound as a curing agent. The HAA system powder coating can easily achieve high gloss and satisfy the demand for high gloss coating, but in some coating fields requiring low gloss powder coating, it is difficult for the HAA system powder coating to satisfy such low gloss demand, more precisely, it is difficult to satisfy such low gloss coating with a one-Shot matting scheme.

The invention patent CN111040591A discloses a "one-step" resin matting technology to realize the "one-step" matting of HAA system powder coating, which discloses: the raw materials used by the resin extinction technology comprise: high acid value semi-crystalline carboxyl polyester resin, random carboxyl polyester resin, hydroxyalkylamide curing agent and additive, and/or pigment and filler. The desired low gloss effect can be achieved by a "one-shot" process using a high acid value semicrystalline carboxyl polyester resin and a carboxyl-free polyester resin together as a film-forming resin to crosslink with a hydroxyalkyl amide curing agent. However, this solution has two obvious technical drawbacks in practical application.

One is the lack of gloss sensitivity. That is, the gloss of the matte surface coating obtained by the technical scheme disclosed in the above patent varies with the thickness of the coating film, specifically, the gloss value is lower as the thickness of the coating film is higher. However, the powder coating often has a phenomenon of uneven coating film thickness during the construction process, and the phenomenon is difficult to avoid, especially when the powder coating is sprayed in a large area, the phenomenon of uneven coating film thickness is more obvious. The defect of gloss sensitivity of the resin extinction technology can cause the application of the resin extinction technology to be limited by the uniformity of the thickness of a coating, especially, the effective control of gloss is difficult to realize when large-area spraying is carried out, and obvious gloss difference is easily generated in different coating thickness areas of a sample plate, so that the application of the resin extinction technology is limited. The severity of the gloss sensitivity can be expressed in terms of the variance between gloss values of the coating at different film thicknesses, with a larger variance indicating a higher sensitivity of gloss to film thickness, whereas a smaller variance indicating a lower sensitivity of gloss to film thickness, the variance in the ideal case should be 0. In contrast, the variance of the gloss values of the coating in the HAA system extinction powder coating disclosed in the invention patent CN111040591A is more than 7 under different coating film thicknesses.

Secondly, the coating has the defect of flowering. Namely, the coating surface cured by the technical scheme disclosed by the patent presents a stripe or spot phenomenon with uneven color, and the appearance of the hair defect in the black formula is particularly obvious. This blooming defect greatly affects the aesthetic appearance of the coating, further limiting the application of the above-mentioned resin matting techniques.

Therefore, how to provide a HAA system matting powder coating that can eliminate the defects of gloss sensitivity and coating bloom has become a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides an application of a gloss stabilizer in a HAA system extinction powder coating, and aims to solve the technical problems of the existing extinction powder coating, such as the defect of gloss sensitivity, the defect of coating blooming and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides an application of a gloss stabilizer in HAA system extinction powder coating, wherein the gloss stabilizer is a fatty acid amide compound and/or a polyallylamine derivative.

Further, the structural general formula of the fatty acid amide compound is as follows:

wherein C is an alkyl group having 1 to 8 carbon atoms, R ₁ And R ₂ Independently an alkyl group having 1 to 20 carbon atoms;

the molecular weight of the fatty acid amide compound is less than or equal to 1000, and the melting point is 100-160 ℃.

Further, the structural general formula of the polyallylamine derivative is as follows:

wherein n is an integer between 10 and 450;

a has one of the following structures 1-4:

wherein a in the structural formulas 1-4 is an integer between 0-100 independently;

R ₃ and R ₄ Independently is alkylene with substituent, alkenylene with substituent or alkylene with ether bond with substituent;

R ₇ and R ₈ Independently a branched alkylene group having 6 to 30 carbon atoms, an alkenylene group having 6 to 30 carbon atoms, or an alkylene group having 6 to 30 carbon atoms, having an ether bond;

R ₉ and R ₁₀ Independently, an alkyl group having a substituent, an alkenyl group having a substituent, a phenyl group having a substituent, or an alkyl group having a substituent and an ether bond.

Furthermore, the amine value of the polyallylamine derivative is 5-150 mg KOH/g, the acid value is 1-10 mg KOH/g, and the melting point is more than or equal to 30 DEG C

Further, the HAA system extinction powder coating comprises the following components in percentage by weight:

25-35% of semi-crystalline carboxyl polyester resin, 25-35% of random carboxyl polyester resin, 3-4% of hydroxyalkyl amide curing agent, 0.5-2% of gloss stabilizer and 30-38% of pigment and/or additive.

Further, the weight average molecular weight of the semi-crystalline carboxyl polyester resin is 1000-20000, the acid value range is 50-150 mg KOH/g, and the melting point is 70-120 ℃.

Further, the weight average molecular weight of the random carboxyl polyester resin is 1000-40000, the acid value range is 10-100 mg KOH/g, and the glass transition temperature is 45-65 ℃.

Further, the hydroxyalkyl amide curing agent is a beta-hydroxyalkyl amide compound, and the structural general formula is as follows:

wherein B is a hydrogen atom, an alkyl group having 1 to 60 carbon atoms, an aryl group or an alkenyl group; r ₅ Independently hydrogen atom, alkyl group containing 1-5 carbon atoms or hydroxyalkyl group containing 1-5 carbon atoms; r ₆ Independently is a hydrogen atom or a methyl group; n 'is an integer of 1 to 10, and n' is an integer of 0 to 2.

Further, the pigment is one or more of titanium dioxide, iron oxide red, iron oxide yellow, chromium pigment, carbon black, phthalocyanine blue, azo, anthraquinone, thioindigo, benzanthrone, triphendioxane and quinacridone;

the additive is one or more of a leveling agent, a plasticizer and a stabilizer.

According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:

the HAA system extinction powder coating with stable extinction effect prepared by the invention has low gloss sensitivity, and the gloss variance under different film thicknesses approaches to 0, thereby greatly improving the gloss stability of the resin extinction technology in the application of the HAA system extinction powder coating;

in the invention, the fatty acid amide compound and/or the polyallylamine derivative are/is used as the gloss stabilizer, so that the defect of pattern formation of HAA system extinction powder coating prepared by adopting the resin extinction technology can be eliminated while the gloss sensitivity is reduced, and the application effect of the resin extinction technology is enhanced.

Drawings

FIG. 1 is a graph showing the variation tendency of gloss at different inspection points in examples 1 to 6 and comparative example;

FIG. 2 is a plot of the effect of the matting powder coating prepared in comparative example 1;

FIG. 3 is a plate effect plot of the matte powder coating prepared in example 1;

FIG. 4 is a plate effect plot of the matte powder coating prepared in example 2;

FIG. 5 is a plate effect plot of the matte powder coating prepared in example 3;

Detailed Description

In the present invention, the structural formula of the fatty acid amide compound is as follows:

wherein C is an alkyl group having 1 to 8 carbon atoms, R ₁ And R ₂ Independently an alkyl group R containing 1 to 20 carbon atoms ₁ And R ₂ May be the same or different.

In the present invention, the alkyl group having 1 to 8 carbon atoms is preferably one of a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, and an octylene group, and is more preferably a methylene group or an ethylene group;

the alkyl group having 1 to 20 carbon atoms is preferably a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, or an eicosyl group, and more preferably a butyl group, a pentyl group, or a hexyl group.

In the present invention, the fatty acid amide compound is more preferably Ethylene Bis Stearamide (EBS) having a structural formula as follows:

in the present invention, the molecular weight of the fatty acid amide compound is 1000 or less, preferably 800 or less, and more preferably 500 or less; the melting point is 100-160 ℃, preferably 120-150 ℃, and more preferably 130-140 ℃.

In the present invention, the structural formula of the polyallylamine derivative is as follows:

wherein n is an integer between 10 and 450, preferably an integer between 50 and 400, and more preferably an integer between 100 and 300;

a has one of the following structures 1-4:

wherein a in the structural formulas 1-4 is independently an integer between 0-100, preferably an integer between 10-80, and more preferably an integer between 20-60;

R ₃ and R ₄ Independently is alkylene having substituent, alkenylene having substituent or alkylene having ether bond having substituent, R ₃ And R ₄ May be the same or different, R ₃ And R ₄ Independently, an alkylene group having a substituent or an alkenylene group having a substituent is preferable, and an alkylene group having a substituent is more preferable;

R ₇ and R ₈ Independently a branched alkylene group having 6 to 30 carbon atoms, an alkenylene group having 6 to 30 carbon atoms orAn alkylene group having 6 to 30 carbon atoms and having an ether bond, preferably an alkenylene group having 6 to 30 carbon atoms and having a substituent or an alkylene group having 6 to 30 carbon atoms and having an ether bond, and more preferably an alkenylene group having 6 to 30 carbon atoms and having a substituent;

R ₉ and R ₁₀ Independently, the substituent is an alkyl group having a substituent, an alkenyl group having a substituent, a phenyl group having a substituent, or an alkyl group having a substituent and an ether bond, preferably an alkyl group having a substituent or an alkenyl group having a substituent, and more preferably an alkyl group having a substituent.

In the invention, the amine value of the polyallylamine derivative is 5-150 mg KOH/g, preferably 10-120 mg KOH/g, and more preferably 40-100 mg KOH/g; the acid value is 1-10 mg KOH/g, preferably 2-8 mg KOH/g, and more preferably 4-6 mg KOH/g; the melting point is not less than 30 ℃, preferably not less than 40 ℃, and more preferably not less than 50 ℃.

In the invention, the HAA system extinction powder coating comprises the following components in percentage by weight:

In the present invention, the HAA system matte powder coating preferably comprises the following components in percentage by weight: 26-34% of semi-crystalline carboxyl polyester resin, 26-34% of random carboxyl polyester resin, 4% of hydroxyalkyl amide curing agent, 0.6-1.9% of gloss stabilizer and 31-37% of pigment and/or additive.

In the present invention, the HAA system matte powder coating further preferably comprises the following components in percentage by weight: 27-33% of semi-crystalline carboxyl polyester resin, 27-33% of random carboxyl polyester resin, 4% of hydroxyalkyl amide curing agent, 0.8-1.8% of gloss stabilizer and 32-36% of pigment and/or additive.

In the present invention, the semi-crystalline carboxyl polyester resin is AHA90, provided by Huaan import and export, Inc., of Anhui province; the weight average molecular weight of the semi-crystalline carboxyl polyester resin is 1000-20000, preferably 4000-15000, and further preferably 8000-12000; the acid value is 50-150 mg KOH/g, preferably 60-130 mg KOH/g, and more preferably 80-120 mg KOH/g; the melting point is 70-120 ℃, preferably 80-110 ℃, and more preferably 90-100 ℃.

In the present invention, the atactic carboxyl polyester resin is SJ5122, provided by new material of anser sword, inc; the weight average molecular weight of the random carboxyl polyester resin is 1000-40000, preferably 1500-10000, and further preferably 3000-6000; the acid value is 10-100 mg KOH/g, preferably 20-80 mg KOH/g, and more preferably 25-40 mg KOH/g; the glass transition temperature is 45-65 ℃, preferably 50-60 ℃, and more preferably 52-58 ℃.

In the invention, the hydroxyalkyl amide curing agent is a beta-hydroxyalkyl amide compound, and the structural general formula is as follows:

In the present invention, the alkyl group having 1 to 60 carbon atoms is preferably one of a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an eicosyl group, a triacontyl group, a forty-alkyl group, a fifty-alkyl group, and a sixty-alkyl group, and is more preferably one of a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an eicosyl group, and a triacontyl group;

aryl is preferably phenyl or naphthyl, and more preferably benzyl or phenethyl;

the alkenyl group is preferably one of an ethylene group, an isopropenyl group, a1, 3-dimethyl-3-propenyl group, a1, 2-dimethyl-2-propenyl group, a 3-carboxy-2-propenyl group and a 3-ethoxycarbonyl-2-propenyl group, and is more preferably one of an ethylene group, an isopropenyl group, a1, 3-dimethyl-3-propenyl group and a1, 2-dimethyl-2-propenyl group.

In the present invention, the alkyl group having 1 to 5 carbon atoms is preferably one of a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an isobutyl group, a tert-butyl group, and a pentyl group, and more preferably a methyl group or an ethyl group;

the hydroxyalkyl group containing 1 to 5 carbon atoms is preferably one of hydroxyethyl, 3-hydroxypropyl, 2-hydroxypropyl, 4-hydroxybutyl, 3-hydroxybutyl, 2-hydroxy-2-methylpropyl, 5-hydroxypentyl, 4-hydroxypentyl, 3-hydroxypentyl and 2-hydroxypentyl; more preferably hydroxyethyl group, 3-hydroxypropyl group or 2-hydroxypropyl group.

In the invention, n' is preferably an integer between 2 and 8, and is further preferably 4 or 5; n "is preferably 1 or 2, and more preferably 1.

In the invention, the pigment is one or more of titanium dioxide, iron oxide red, iron oxide yellow, chromium pigment, carbon black, phthalocyanine blue, azo, anthraquinone, thioindigo, benzanthrone, triphendioxane and quinacridone, preferably one or more of titanium dioxide, iron oxide red, iron oxide yellow, chromium pigment, carbon black, phthalocyanine blue, azo, anthraquinone and thioindigo, and further preferably one or more of titanium dioxide, iron oxide red, carbon black and azo; the additive is one or more of a leveling agent, a plasticizer and a stabilizer, and is added according to the actual situation.

In the invention, the preparation method of the HAA system extinction powder coating is a conventional method, and specifically comprises the following steps: mixing the raw materials uniformly, and then performing hot melting mixing, tabletting, crushing and sieving to obtain a powder coating;

the particle size of the coating is 80-200 meshes, preferably 120-190 meshes, and further preferably 180 meshes.

In the present invention, the powder coating can be adhered to a substrate (e.g., a metal substrate) by powder electrostatic gun, friction gun spray, fluidized bed dip coating, hot melt sintering, etc., and then cured by heating or radiation to form a coating film, the thickness of the coating film is preferably 60 to 200 μm, and more preferably 80 μm.

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The powder coatings described in the examples of the invention and in the comparative examples were prepared and tested by the following methods.

Mixing the raw materials together according to a ratio, placing the mixture into a plastic bag, manually mixing the mixture for 5min, adding the mixture into a double-screw extruder for test, melting and homogenizing the mixture, tabletting, cooling, grinding the mixture into fine powder, sieving the fine powder by a 180-mesh standard sieve, electrostatically spraying the low-gloss powder coating composition on a degreased cold-rolled steel plate, curing the mixture for 15min at the temperature of 200 ℃, and testing the cured product.

Test item and method

1. Thickness of coating film

The measurement was carried out in accordance with the GB/4957 standard, directly using a magnetic thickness meter (thickness meter Q Nix4500 from Automation Dr. Nix GmbH, Germany).

2. Gloss of

The reflectance was measured directly at 60 ℃ according to GB/T1743 using Micro-gloss 60 ℃ 4442 from BYK, Germany.

Gloss detection point: the gloss values of the coatings at coating thicknesses of 65. + -.5. mu.m, 75. + -.5. mu.m, 85. + -.5. mu.m, 95. + -.5. mu.m, 105. + -.5. mu.m, 115. + -.5. mu.m, respectively, were examined and recorded as X ₁ 、X ₂ 、X ₃ 、X ₄ 、X ₅ 、X ₆ 。

3. Variance of gloss

Calculating the gloss values of the 6 detection points according to the following calculation formula to obtain sample variance S ² And the total variance σ ² ，

S ² Is the variance of the sample

σ ² Total variance

X is the gloss value at different detection points

The average of the gloss values at the different test points.

The raw material components and the amounts used for the powder coatings prepared in examples 1 to 3 and comparative example 1 are shown in Table 1.

TABLE 1 raw material components and amounts used in examples 1-3 and comparative example 1

	Comparative example 1	Example 1	Example 2	Example 3
					SJ5122	29.8％	29.7％	29.5％	29.4％
AHA90	29.8％	29.7％	29.5％	29.4％
					AHA6552	3.8％	3.8％	3.8％	3.8％
AHA1088P	1.0％	1.0％	1.0％	1.0％
					Benzoinum	0.2％	0.2％	0.2％	0.2％
Carbon black	0.6％	0.6％	0.6％	0.6％
					Barium sulfate	34.8％	34.6％	34.4％	34.3％
EBS	0.0％	0.5％	1.0％	1.5％

The raw material components and the amounts used for the powder coatings prepared in examples 4 to 6 are shown in Table 2.

TABLE 2 raw material components and amounts used in examples 4-6

Wherein, SJ5122 is atactic carboxyl polyester resin provided by Anhui Shenjian New materials GmbH; AHA90 is a semi-crystalline carboxyl polyester resin, available from Huaan import and export Limited, Anhui province; AHA6552 is a hydroxyalkyl amide curative, provided by Huaan import and export Limited, Anhui province; AHA1088P is a leveling agent, available from Huaan import and export Limited, Inc., of Anhui province; EBS and AJISPER PB821 are both gloss stabilizers, wherein EBS is provided by New materials, Inc. of wisdom Union, Jiangxi, and AJISPER PB821 is provided by Kagaku corporation, Japan.

The gloss results at different test points of examples 1 to 6 and comparative example 1 are shown in Table 3.

TABLE 3 gloss values at different test points

The results of the gloss variance calculations for the different test points of examples 1-6 and comparative example 1 are shown in Table 4.

Table 4: gloss variance calculation results at different detection points

As can be seen from Table 4 and FIG. 1, the variance of the spot gloss gradually decreased with the increase of the EBS addition amount, and eventually became stable (S) at the EBS addition amount of 1% (example 2) ² ＝2.07，σ ² 1.73), the decrease in the variance indicates a decrease in the degree of dispersion of the gloss values measured at the different detection points, more precisely, the closer the gloss values of the coating at different thicknesses are to the average of the gloss values measured at all the detection points, more precisely, the stability of the gloss of the coating to the thickness of the coating is improved, more precisely, EBS significantly improves the stability of the gloss to the thickness of the coating, thereby decreasing the gloss sensitivity of the HAA system matte powder coating, and this effect of EBS on decreasing the gloss sensitivity increases with the increase in the addition of EBS;

when PB821 was added in an amount of 1% as a gloss stabilizer (example 5), the variation in the gloss at the check point was reduced to 0.05 (S) ² ＝0.05，σ ² 0,05), significantly lower than the variance value of comparative example 1 (S in comparative example 1) ² ＝0.03，σ ² When the amount of PB821 was increased to 1.5% (example 6), the variance further decreased to 0, indicating that when PB821 was used as a gloss stabilizer, the sensitivity of gloss to the coating film thickness could be completely eliminated and the matte surface could obtain a uniform matte effect at different film thicknesses.

As can be seen from fig. 2 and 4, the plate surface obtained in comparative example 1 (fig. 2) had significant defect in the development, and when 0.5% of gloss stabilizer EBS was added (fig. 3), the defect in the development was significantly reduced, and very few defects in the development existed only at the edges; when the addition of the EBS is continuously increased to 1 percent (shown in figure 4), the flowering defects of the coating are completely eliminated, and the uniform layout effect without the flowering defects is presented; continuing to increase the EBS addition to 1.5% (fig. 5) the coating effect was consistent with that of fig. 4, which is a uniform, non-blooming effect. The effect of PB821 on eliminating the defect of the blooming on the plate surface is consistent with that of EBS, the defect of the blooming on the coating can be obviously eliminated, and the plate surface effect without the defect of the blooming can be obtained when the addition amount of PB821 is 1 percent (embodiment 5).

It can also be seen from Table 4 that the average gloss values at different film thicknesses of examples 1-3 are increased compared to comparative example 1 at different EBS addition levels, and that surface EBS leads to increased gloss of the coating while reducing gloss sensitivity and eliminating plate surface graining defects. In contrast to the EBS effect, the gloss of the coating was further reduced when PB821 was used as a gloss stabilizer, as shown by the significantly lower gloss of examples 5 and 6 than comparative example 1 shown in table 4, which indicates that both the sensitivity to gloss improvement and the matting effect of AHA90 can be significantly enhanced to obtain lower gloss when PB821 was added at 1% and 1.5%.

The raw material components and the amounts used for the powder coatings prepared in comparative examples 2 to 7 are shown in Table 5.

TABLE 5 raw material components and amounts used in examples 2-7

The gloss results at different test points of comparative examples 1 to 7 are shown in Table 6.

Table 6: gloss values at different detection points

Detection point

X ₁

X ₂

X ₃

X ₄

X ₅

X ₆

Comparative example 1

11.5％

10.5％

9.0％

6.2％

5.1％

4.3％

Comparative example 2

11.7％

9.2％

6.4％

4.6％

3.9％

3.4％

Comparative example 3

12.5％

10.8％

8.1％

6.3％

4.4％

4.3％

Comparative example 4

12.3％

10.8％

8.5％

7.2％

5.2％

4.4％

Comparative example 5

14.3％

13.2％

10.8％

8.7％

6.8％

6.3％

Comparative example 6

15.5％

13.9％

12.1％

10.1％

6.9％

5.8％

Comparative example 7

16.1％

15.4％

13.2％

9.1％

7.8％

7.7％

The results of the gloss variance calculations for the different test points of comparative examples 1-7 are shown in Table 7.

Table 7: gloss variance calculation results at different detection points

As can be seen from tables 6 and 7, neither erucamide nor stearic monoethanolamide is effective in reducing gloss sensitivity and this results in an increase in the variance of gloss at different inspection points and an increase in gloss sensitivity. Erucamide and stearic monoethanolamide, although both are stearic amides, are not useful as gloss stabilizers for the purposes of the present invention to reduce gloss sensitivity.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The application of the gloss stabilizer in HAA system extinction powder coating is characterized in that the gloss stabilizer is a fatty acid amide compound and/or a polyallylamine derivative.

2. The use of claim 1, wherein the fatty acid amide compound has the general structural formula:

3. Use according to claim 1, characterized in that the polyallylamine derivatives have the general structural formula:

wherein n is an integer between 10 and 450;

a has one of the following structures 1-4:

4. Use according to any one of claims 1 to 3, wherein the polyallylamine derivative has an amine number of 5 to 150mg KOH/g, an acid number of 1 to 10mg KOH/g and a melting point of not less than 30 ℃.

5. Use according to claim 4, characterized in that the HAA system matting powder coating comprises, in percentages by weight, the following components:

6. The use according to claim 5, wherein the semi-crystalline carboxyl polyester resin has a weight average molecular weight of 1000 to 20000, an acid value in the range of 50 to 150mg KOH/g, and a melting point of 70 to 120 ℃.

7. The use according to claim 5 or 6, wherein the random carboxyl polyester resin has a weight average molecular weight of 1000 to 40000, an acid value in the range of 10 to 100mg KOH/g, and a glass transition temperature of 45 to 65 ℃.

8. The use according to claim 7, wherein the hydroxyalkyl amide curing agent is a β -hydroxyalkyl amide compound having the general structural formula:

wherein B is a hydrogen atom, an alkyl group having 1 to 60 carbon atoms, an aryl group or an alkenyl group; r ₅ Independently hydrogen atom, alkyl group containing 1-5 carbon atoms or hydroxyalkyl group containing 1-5 carbon atoms; r is ₆ Independently is a hydrogen atom or a methyl group; n 'is an integer of 1 to 10, and n' is an integer of 0 to 2.

9. The use according to claim 8, wherein the pigment is one or more of titanium dioxide, iron oxide red, iron oxide yellow, chromium pigment, carbon black, phthalocyanine blue, azo, anthraquinone, thioindigo, benzanthrone, triphendioxane and quinacridone;