CN117820946A - Powder coating composition and coating thereof - Google Patents
Powder coating composition and coating thereof Download PDFInfo
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- CN117820946A CN117820946A CN202311574860.1A CN202311574860A CN117820946A CN 117820946 A CN117820946 A CN 117820946A CN 202311574860 A CN202311574860 A CN 202311574860A CN 117820946 A CN117820946 A CN 117820946A
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- polyester resin
- powder coating
- coating composition
- amorphous polyester
- curing
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- 239000000843 powder Substances 0.000 title claims abstract description 62
- 239000008199 coating composition Substances 0.000 title claims abstract description 48
- 238000000576 coating method Methods 0.000 title claims abstract description 28
- 239000011248 coating agent Substances 0.000 title claims abstract description 25
- 229920001225 polyester resin Polymers 0.000 claims abstract description 78
- 239000004645 polyester resin Substances 0.000 claims abstract description 78
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
- 239000002253 acid Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims description 26
- 230000008018 melting Effects 0.000 claims description 24
- 239000002270 dispersing agent Substances 0.000 claims description 18
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims description 17
- 238000007872 degassing Methods 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 3
- 230000009477 glass transition Effects 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 25
- 238000001723 curing Methods 0.000 description 19
- 239000002994 raw material Substances 0.000 description 16
- 238000009472 formulation Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000000113 differential scanning calorimetry Methods 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000013035 low temperature curing Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920013685 Estron Polymers 0.000 description 1
- DNXHEGUUPJUMQT-CBZIJGRNSA-N Estrone Chemical compound OC1=CC=C2[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3CCC2=C1 DNXHEGUUPJUMQT-CBZIJGRNSA-N 0.000 description 1
- 235000011609 Pinus massoniana Nutrition 0.000 description 1
- 241000018650 Pinus massoniana Species 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229960003399 estrone Drugs 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- HHFDXDXLAINLOT-UHFFFAOYSA-N n,n'-dioctadecylethane-1,2-diamine Chemical compound CCCCCCCCCCCCCCCCCCNCCNCCCCCCCCCCCCCCCCCC HHFDXDXLAINLOT-UHFFFAOYSA-N 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a powder coating composition and a coating thereof, comprising an amorphous polyester resin accounting for not less than 45 weight percent of the powder coating composition, a curing agent for curing the amorphous polyester resin, and a crystalline polyester resin; wherein the amorphous polyester resin has an acid value ranging from 30 to 40mgKOH/g and a viscosity at 200 ℃ of not more than 600 mpa.s; the invention carries out curing reaction at the curing temperature of not higher than 150 ℃ to obtain the coating with PCI leveling grade of not lower than 8.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to a powder coating composition and a coating thereof.
Background
In order to meet the appearance requirements of leveling and the like, the conventional outdoor low-temperature curing powder coating is generally cured at 160 ℃ or above. For outdoor powder coating materials cured at 160 ℃ or below, the viscosity of the cured resin is high, and degassing is difficult, so that the outdoor powder coating materials cured at 160 ℃ or below have a texture effect such as sand marks and orange marks, and cannot achieve a leveling appearance.
Accordingly, the applicant has desired to develop this to improve the above technical problems.
Disclosure of Invention
In view of the above, the present invention aims to provide a powder coating composition and a coating thereof, wherein the PCI leveling grade of the coating obtained by forming after curing reaction at a curing temperature of not higher than 150 ℃ is not lower than 8.
The technical scheme adopted by the invention is as follows:
a powder coating composition comprising an amorphous polyester resin in an amount of not less than 45wt% based on the weight of the powder coating composition, a curing agent for curing the amorphous polyester resin, and a crystalline polyester resin; wherein the acid value of the amorphous polyester resin is in the range of 30 to 40mgKOH/g, and the viscosity thereof at 200 ℃ is not higher than 600mpa.s.
Preferably, the amorphous polyester resin has a glass transition temperature in the range of 55 to 65 ℃; and/or the amorphous polyester resin has a softening point temperature in the range of 102 to 120 ℃.
Preferably, the amorphous polyester resin is present in an amount ranging from 50 to 90wt% of the powder coating composition.
Preferably, the crystalline polyester resin comprises 1 to 15wt% of the powder coating composition.
Preferably, the crystalline polyester resin has a melting point not greater than the softening point temperature of the amorphous polyester resin; and/or the crystalline polyester resin has a viscosity at 125 ℃ of not more than 1500mpa.s.
Preferably, the crystalline polyester resin has a melting point of 60 to 102 ℃; and/or the acid value of the crystalline polyester resin is in the range of 45 to 65mgKOH/g.
Preferably, the curing agent comprises TGIC and/or hydroxyalkylamide.
Preferably, a low melting point degassing agent having a melting point not greater than the softening point temperature of the amorphous polyester resin is further included.
Preferably, leveling agents and/or fillers and/or pigments and/or dispersants are also included, wherein when said dispersants are included, preferably high molecular weight copolymers having pigmentary groups adsorbed on silica are included.
Preferably, a coating is obtained by spraying the powder coating composition described above onto a substrate, and shaping the coating after a curing reaction; wherein the curing temperature of the coating is not higher than 150 ℃, and the PCI leveling grade is not lower than 8.
It should be noted that the acid value detection standard according to the application is ISO 3682-1998; the viscosity number measurement standard is ASTM D4287-1994, and the measurement equipment used can be a standard commercial CONE-PLATE VISCOMETER (for example, ICI CONE-PLATE VISCOMETER (CONE & PLATE) with the name CAP 2000 VISCOMER from Brookfield); the related melting point temperature and solidification temperature data are detected by a METLER thermal analyzer with the model of DSC Q20, the detection method adopts a differential scanning thermal method DSC (English is fully called as Differential Scanning Calorimetry), and the heating rate parameter is set at 20 ℃/min; the softening point temperature standard is referred to as ISO4625-1980.
The application provides a formula base material of amorphous polyester resin with high activity and low viscosity, and a specific powder coating formula scheme of crystalline polyester resin, wherein the powder coating is formed after curing reaction at the curing temperature of not higher than 150 ℃ to obtain a coating with PCI leveling grade of not lower than 8.
Detailed Description
The embodiment of the application provides a powder coating composition, which comprises an amorphous polyester resin, a curing agent for curing the amorphous polyester resin and a crystalline polyester resin, wherein the amorphous polyester resin accounts for not less than 45 weight percent of the powder coating composition; wherein the acid value of the amorphous polyester resin is in the range of 30 to 40mgKOH/g, and the viscosity thereof at 200 ℃ is not higher than 600mpa.s.
Preferably, in this embodiment, the amorphous polyester resin has a glass transition temperature in the range of 55 to 65 ℃; and/or preferably, in the present embodiment, the amorphous polyester resin has a softening point temperature in the range of 102 to 120 ℃.
Preferably, in this embodiment, the amorphous polyester resin comprises in the range of 50 to 90wt%, more preferably 50 to 85wt%, still more preferably 50 to 80wt% of the powder coating composition; preferably, in this embodiment, the crystalline polyester resin comprises 1 to 15wt%, more preferably 1 to 10wt%, still more preferably 2 to 10wt% of the weight of the powder coating composition;
preferably, in order to further facilitate the leveling effect of the coating under low temperature curing conditions, in the present embodiment, the melting point of the crystalline polyester resin is not more than the softening point temperature of the amorphous polyester resin; and/or preferably, in the present embodiment, the crystalline polyester resin has a viscosity at 125 ℃ of not more than 1500mpa.s; further preferably, in the present embodiment, the crystalline polyester resin has a melting point of 60 to 102 ℃; and/or further preferably, in the present embodiment, the acid value of the crystalline polyester resin ranges from 45 to 65mgKOH/g.
Preferably, to facilitate the crosslinking curing reaction with the amorphous polyester resin, in this embodiment, the curing agent comprises TGIC and/or hydroxyalkylamide.
Preferably, in order to further facilitate the leveling effect of the coating, in the present embodiment, a low-melting-point degassing agent having a melting point not greater than the softening point temperature of the amorphous polyester resin is further included.
Preferably, in order to further facilitate the leveling effect of the coating, in this embodiment, a leveling agent and/or a dispersing agent is also included, wherein when a dispersing agent is included, a high molecular weight copolymer having a pigment-philic group adsorbed on silica is preferably included.
Preferably, the embodiment also provides a coating, wherein the powder coating composition is sprayed on a substrate, and the coating is obtained by forming after curing reaction; wherein the curing temperature of the coating is not higher than 150 ℃, and the PCI leveling grade is not lower than 8.
All the raw materials related to the application can be directly purchased in the market, and the raw material sources are easy to obtain.
In the practice of the present application, it is also possible to add known leveling agents, deaerating agents, antioxidants, stabilizers, curing accelerators, functional auxiliaries, fillers, pigments or other auxiliaries, etc. to the powder coating composition, which are all routine technical choices for the person skilled in the art.
In the preparation of the powder coating composition of the present application, the powder coating composition of the present embodiment may be prepared by any known preparation process, preferably by mixing, melt-extruding, crushing and other known processes, and the preparation process is not particularly limited.
In order to verify the technical effects of the application, the application specifically performs the following groups of examples and comparative examples, and performs specific test performance comparisons on each example and each comparative example:
example 1: a powder coating composition comprises the following raw materials:
60wt% of an amorphous polyester resin, which is a polyester resin CE2068 provided by Pinus massoniana, zhejiang, has an acid value ranging from 32 to 38mgKOH/g, a viscosity at 200 ℃ ranging from 3000 to 5000mPa.s, and a softening point temperature ranging from 105 to 115 ℃;
5wt% TGIC, HT-702 available under the name Huang Shanhua;
5wt% of a crystalline polyester resin having a trade name ALMATEX AP-8500, a viscosity at 125℃in the range of 900 to 1100mPa.s, a melting point in the range of 60 to 102℃and an acid value in the range of 54 to 58mgKOH/g;
1wt% of a dispersant, the brand of which is BYK-3951P;
1wt% of a low melting point degassing agent, which is marked CERAFLOUR 964 and has a melting point of 75 ℃;
1wt% of leveling agent with the trade name of Resiffow PL-200from ESTRON;
1wt% of wax powder, specifically N, N' -distearylethylenediamine with CAS number of 110-30-5;
26wt% of filler, and specifically barium sulfate.
Example 2: the remaining technical solutions of this embodiment 2 are the same as those of embodiment 1, except that this embodiment 2 provides a powder coating composition, which has the following raw material formulation:
50wt% of an amorphous polyester resin;
2wt% TGIC;
12wt% of a crystalline polyester resin;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
32% by weight of filler.
Example 3: the remaining technical solutions of this embodiment 3 are the same as those of embodiment 1, except that this embodiment 3 provides a powder coating composition, which has the following raw material formulation:
60wt% of an amorphous polyester resin;
6wt% TGIC;
10wt% of a crystalline polyester resin;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
20% by weight of filler.
Example 4: the remaining technical solutions of this embodiment 4 are the same as those of embodiment 1, wherein the powder coating composition provided in this embodiment 4 has the following raw material formulation:
65wt% of an amorphous polyester resin;
TGIC 8 wt%;
5wt% of a crystalline polyester resin;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
18wt% of filler.
Example 5: the remaining technical solutions of this embodiment 5 are the same as those of embodiment 1, except that this embodiment 5 provides a powder coating composition, which has the following raw material formulation:
70wt% of an amorphous polyester resin;
TGIC 8 wt%;
10wt% of a crystalline polyester resin;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
8% by weight of filler.
Example 6: the remaining technical solutions of this embodiment 6 are the same as those of embodiment 1, except that this embodiment 6 provides a powder coating composition, which has the following raw material formulation:
75wt% of an amorphous polyester resin;
10wt% TGIC;
10wt% of a crystalline polyester resin;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
1% by weight of filler.
Example 7: the remaining technical solutions of this embodiment 7 are the same as those of embodiment 1, except that this embodiment 7 provides a powder coating composition, which has the following raw material formulation:
80wt% of an amorphous polyester resin;
10wt% TGIC;
7wt% of a crystalline polyester resin;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1% by weight of a levelling agent.
Example 8: the remaining technical solutions of this embodiment 8 are the same as those of embodiment 1, except that this embodiment 8 provides a powder coating composition, which has the following raw material formulation:
85wt% of an amorphous polyester resin;
10wt% TGIC;
3wt% of a crystalline polyester resin;
1wt% of a dispersant;
1% by weight of a low-melting degassing agent.
Example 9: the remaining technical solutions of this embodiment 9 are the same as those of embodiment 1, in which the powder coating composition provided in this embodiment 9 has the following raw material formulation:
85wt% of an amorphous polyester resin;
5wt% TGIC;
8wt% of a crystalline polyester resin.
1wt% of a dispersant;
1% by weight of a low-melting degassing agent.
Example 10: the remaining technical solutions of this embodiment 10 are the same as those of embodiment 1, wherein the powder coating composition provided in this embodiment 10 has the following raw material formulation:
90wt% of an amorphous polyester resin;
5wt% TGIC;
5% by weight of crystalline polyester resin.
Comparative example 1: the remaining technical solutions of this comparative example 1 are identical to example 1, except that: this comparative example 1 provides a powder coating composition having the following raw material formulation:
60wt% of an amorphous polyester resin;
5wt% TGIC;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
31wt% of filler.
Comparative example 2: the remaining technical solutions of this comparative example 2 are identical to example 1, except that: this comparative example 2 provides a powder coating composition having the following raw material formulation:
65wt% of an amorphous polyester resin;
5wt% TGIC;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
26% by weight of filler.
Comparative example 3: the remaining technical solutions of this comparative example 3 are identical to example 1, only with the difference that: this comparative example 3 provides a powder coating composition having the following raw material formulation:
60wt% of an amorphous polyester resin;
10wt% TGIC;
1wt% of a dispersant;
1wt% of a low melting point degassing agent;
1wt% of a leveling agent;
1wt% of wax powder;
26% by weight of filler.
Comparative example 4: the remaining technical solutions of this comparative example 4 are identical to example 1, only with the difference that: in this comparative example 4, the brand of amorphous polyester resin was replaced with CYTEC4420-0, which has an acid value of 49-54mgKOH/g and a viscosity of 4500-6600mPa.s at 200 ℃.
Comparative example 5: the remaining technical solutions of this comparative example 5 are identical to example 1, only with the difference that: in this comparative example 5, the brand of the amorphous polyester resin was replaced with GH-5514 carboxyl polyester resin, the acid value was 52 to 60mgKOH/g, and the viscosity at 200℃was 3500 to 4500mPa.s.
Comparative example 6: the remaining technical solutions of this comparative example 6 are identical to example 1, except that: in this comparative example 6, the amorphous polyester resin was replaced with an epoxy resin (GESR 903H, trade name "Hongchang" material), and the TGIC was replaced with an epoxy resin curing agent (Aradur 2844, trade name "HUNTSMAN").
The powder coating compositions of each example and each comparative example were obtained by the procedures of weighing, premixing, melt extrusion, pulverizing, cyclone separation, and the like (known process preparation techniques) according to the above raw material formulation.
The powder coating compositions are prepared in each of the above examples 1-10 and comparative examples 1-6, and after spraying and curing (the curing conditions are uniformly selected to be 150 ℃ C. @15 min), the cured coatings are respectively obtained, and the film thicknesses of the cured coatings are 60-100 mu m; the present application conducted a performance test comparison of each of the above cured coatings as shown in table 1 below:
table 1 comparative tables for performance testing of the examples and comparative examples of the present application
It should be noted that the performance test of the present example or comparative example was performed according to the test criteria or conditions described in table 2 below.
Table 2 test items and test criteria or conditions
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A powder coating composition comprising an amorphous polyester resin in an amount of not less than 45% by weight based on the weight of the powder coating composition, a curing agent for curing the amorphous polyester resin, and a crystalline polyester resin; wherein the acid value of the amorphous polyester resin is in the range of 30 to 40mgKOH/g, and the viscosity thereof at 200 ℃ is not higher than 600mpa.s.
2. The powder coating composition of claim 1, wherein the amorphous polyester resin has a glass transition temperature in the range of 55 to 65 ℃; and/or the amorphous polyester resin has a softening point temperature in the range of 102 to 120 ℃.
3. The powder coating composition of claim 1, wherein the amorphous polyester resin comprises in the range of 50 to 90wt% of the powder coating composition.
4. A powder coating composition as recited in claim 1, wherein the crystalline polyester resin comprises 1 to 15wt% of the powder coating composition by weight.
5. The powder coating composition of claim 1, wherein the crystalline polyester resin has a melting point no greater than the softening point temperature of the amorphous polyester resin; and/or the crystalline polyester resin has a viscosity at 125 ℃ of not more than 1500mpa.s.
6. The powder coating composition of claim 1, wherein the crystalline polyester resin has a melting point of 60 to 102 ℃; and/or the acid value of the crystalline polyester resin is in the range of 45 to 65mgKOH/g.
7. The powder coating composition of claim 1, wherein the curing agent comprises TGIC and/or hydroxyalkylamide.
8. The powder coating composition of claim 1, further comprising a low melting point degassing agent having a melting point not greater than the softening point temperature of the amorphous polyester resin.
9. A powder coating composition according to claim 1, further comprising a leveling agent and/or a filler and/or a pigment and/or a dispersant, wherein when said dispersant is included, preferably a high molecular weight copolymer having pigmentary groups adsorbed on silica is included.
10. A coating, characterized in that the powder coating composition according to any one of claims 1 to 9 is sprayed on a substrate, and the coating is formed after a curing reaction; wherein the curing temperature of the coating is not higher than 150 ℃, and the PCI leveling grade is not lower than 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311574860.1A CN117820946A (en) | 2023-11-23 | 2023-11-23 | Powder coating composition and coating thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311574860.1A CN117820946A (en) | 2023-11-23 | 2023-11-23 | Powder coating composition and coating thereof |
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| Publication Number | Publication Date |
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| CN117820946A true CN117820946A (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311574860.1A Pending CN117820946A (en) | 2023-11-23 | 2023-11-23 | Powder coating composition and coating thereof |
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| Country | Link |
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| CN (1) | CN117820946A (en) |
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- 2023-11-23 CN CN202311574860.1A patent/CN117820946A/en active Pending
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