CN115717013B - Transparent powder coating composition and coating thereof - Google Patents
Transparent powder coating composition and coating thereof Download PDFInfo
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- CN115717013B CN115717013B CN202211667191.8A CN202211667191A CN115717013B CN 115717013 B CN115717013 B CN 115717013B CN 202211667191 A CN202211667191 A CN 202211667191A CN 115717013 B CN115717013 B CN 115717013B
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Abstract
The invention discloses a transparent powder coating composition and a coating thereof, at least comprising acrylic resin, a curing agent and a defoaming auxiliary agent, wherein the defoaming auxiliary agent comprises an amide modified phenolic urea surfactant; the transparent coating provided by the application is arranged on the bottom coating and used as the finishing coating of the bottom coating, so that the compatibility between the finishing coating and the bottom coating can be obviously improved, and the finishing coating has good flatness and little pinhole defect.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to a transparent powder coating composition and a coating applied to the transparent powder coating composition.
Background
The thermosetting powder coating has the advantages of environmental protection, low energy consumption, convenient construction, no (at least a small amount of) VOC emission and the like, so that the thermosetting powder coating is widely used for replacing paint and water paint to realize the protection and decoration of products in various fields.
In some specific applications, it is required to further provide a finishing coating on the primer coating (usually an ink cured coating or a liquid cured coating), and in order to meet the environmental protection requirement, it is desirable to spray and cure the finishing coating with a thermosetting powder coating to obtain a thermosetting coating. However, in practical application, the existing conventional thermosetting powder coating with transparent finishing effect has poor compatibility with the primer coating, so that the flatness after finishing is poor, and the finishing coating is accompanied with slight pinhole-shaped defects, thereby obviously affecting the finishing effect on the primer coating.
Therefore, the applicant hopes to develop a new technical scheme to solve the above technical problems.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a transparent powder coating composition and a coating layer thereof, wherein a transparent coating layer provided by the present invention is provided on a primer coating layer, and the transparent coating layer is used as an overcoat layer of the primer coating layer, so that compatibility between the overcoat layer and the primer coating layer can be significantly improved, and the overcoat coating layer has good flatness and little pinhole defects.
The technical scheme adopted by the invention is as follows:
a clear powder coating composition comprising at least an acrylic resin, a curing agent, and a defoamer aid, wherein the defoamer aid comprises an amide modified phenolic urea surfactant.
Preferably, the defoamer aid comprises 0.1 to 2.5wt% of the transparent powder coating composition.
Preferably, the melting point of the defoaming agent is 125+ -3deg.C.
Preferably, the acrylic resin has an epoxy equivalent weight in the range of 450 to 600g/eq.
Preferably, the acrylic resin comprises GMA acrylic resin; and/or the curing agent comprises a diacid curing agent; and/or the acrylic resin contains a leveling agent.
Preferably, the acrylic resin is present in an amount of not less than 70wt% based on the weight of the clear powder coating composition; and/or the weight part ratio of the curing agent to the acrylic resin is in the range of 1:8-1:3.
Preferably, the transparent powder coating composition further comprises an anti-aging aid and/or alumina.
Preferably, the clear powder coating composition has a gel time in the range of 52-65 seconds at 180 ℃ and/or a diagonal flow length of not less than 245mm at 180 ℃.
Preferably, a transparent coating is obtained by spraying the transparent powder coating composition described above on a substrate, and shaping the transparent coating after curing reaction.
Preferably, the base material is provided with a primer coating, and the transparent coating is used as a finishing coating of the primer coating.
It should be noted that, throughout the present application, the detection criteria according to which the gel time is referred to are: GB/T16995-1997; the related detection standard for the diagonal flow length is as follows: GB/T21782.11-2010; the detection criteria according to which the epoxy equivalent is concerned are: GB/T4612-2008; the detection criteria according to which the softening point is concerned are: GB/T4507-1999: the melting point referred to is based on the detection standard ASTM F2625-07.
The application surprisingly finds that in a transparent powder coating composition using an acrylic resin as a thermosetting resin, an amide modified phenolic urea surfactant is used as a specific defoaming auxiliary agent, a transparent coating layer obtained by spraying and curing the transparent powder coating composition is arranged on a base coating layer, and the transparent coating layer is used as an over-coating layer of the base coating layer, so that the compatibility between the over-coating layer and the under-coating layer can be obviously improved, and the over-coating layer has good flatness and little pinhole defects.
Detailed Description
The embodiment of the application provides a transparent powder coating composition, which at least comprises acrylic resin, a curing agent and a defoaming auxiliary agent, wherein the defoaming auxiliary agent comprises an amide modified phenolic urea surfactant.
Preferably, in this embodiment, the defoamer aid comprises 0.1 to 2.5wt%, more preferably 0.2 to 2wt%, still more preferably 0.5 to 1.5wt% of the clear powder coating composition; still more preferably, in this embodiment, the amide modified phenolic urea surfactant comprises from 0.1 to 2.5wt%, more preferably from 0.2 to 2wt%, and even more preferably from 0.5 to 1.5wt% of the clear powder coating composition. Further preferably, in the present embodiment, the melting point of the defoaming agent is 125±3 ℃. In particular, preferably, in the present embodiment, the amide-modified phenolic urea surfactant is of the type derived from TROY542DG, of course, may be employed with the same or similar effectThe amide modified phenolic urea surfactant of the fruit acts as an antifoaming aid in the examples herein.
Considering that an excessively high epoxy equivalent may affect the basic mechanical properties of the transparent coating layer, and an excessively low epoxy equivalent may affect the flatness of the transparent coating layer, it is preferable that the epoxy equivalent of the acrylic resin in the present embodiment ranges from 450 to 600 g/eq; more preferably 480 to 580g/eq, still more preferably 500 to 550g/eq.
Preferably, to further facilitate this example in providing a clear overcoat effect of the clear coat layer relative to the basecoat layer, in this embodiment, the acrylic resin contains a leveling agent.
Preferably, in order to obtain a good curing reaction effect and further facilitate the flatness of the transparent coating, in the present embodiment, the acrylic resin includes GMA acrylic resin; and/or the curing agent includes a dibasic acid curing agent, and further preferably dodecadibasic acid (DDDA, acronym english "dodecanedioic acid").
Preferably, in order to obtain a more excellent clear coat finishing effect, in the present embodiment, the acrylic resin is present in a proportion of not less than 70% by weight based on the weight of the clear powder coating composition; more preferably 70-92wt%; more preferably 72 to 88wt%, still more preferably 75 to 85wt%. Preferably, in order to facilitate the overpring effect of the transparent coating, in this embodiment, it is not recommended to add other types of thermosetting resins to the transparent powder coating composition, or at least other types of thermosetting resins (e.g. polyester resins or epoxy resins), in a proportion of not more than 10% by weight, preferably not more than 5% by weight, most preferably not to be added to the transparent powder coating composition, in addition to the acrylic resin as thermosetting resin.
Preferably, in order to obtain a good curing reaction effect, in the present embodiment, the weight part ratio between the curing agent and the acrylic resin ranges from 1:8 to 1:3, more preferably from 1:6 to 1:4; further preferably 1:5.5 to 1:4.5.
Further specifically preferably, in the present embodiment, the acrylic resin may be selected from GMA15 epoxy-based acrylic resins from the chemical of the Ningbo south sea, which themselves contain a leveling agent, and which have an epoxy equivalent weight in the range of 510 to 550g/eq; the softening point is 100-110 ℃, or acrylic resin with the same or similar effect is selected, and the embodiment does not limit the acrylic resin solely; any known DDDA curing agent or other known diacid curing agents can be specifically selected as the curing agent, and the embodiment is not limited only.
Preferably, in this embodiment, the clear powder coating composition further comprises an anti-aging aid in order to facilitate the anti-aging effect of the clear coat layer.
Preferably, in this embodiment, the transparent powder coating composition further comprises alumina in order to improve the flowability of the powder coating composition at the time of the subsequent spray application.
Preferably, in this embodiment, the clear powder coating composition has a gel time in the range of 52 to 65 seconds at 180 ℃ and/or a diagonal flow length of not less than 245mm, more preferably 245 to 275mm, still more preferably 250 to 270mm at 180 ℃.
Preferably, other well known adjuvants may also be optionally added to the clear powder coating composition in the practice of this application, such as leveling agents, deaerators, antioxidants, dispersants, pigments, fillers, stabilizers, flow agents, waxes and/or other adjuvants and the like, which are routine technical choices for those skilled in the art. Further preferably, in this embodiment, in order to obtain a more excellent effect of the clear coat layer, it is recommended that the filler is not added to the clear powder coating composition in view of the effect of the clear coat layer to be affected by the filler added, or at least to ensure that the added filler does not significantly affect the clear effect of the coating layer, the maximum addition amount of the filler is not more than 5wt%.
In the present embodiment, the transparent powder coating composition of the present embodiment is preferably prepared by known processes such as mixing raw materials, melt extrusion, and crushing, but the transparent powder coating composition of the present embodiment may be prepared by other known preparation processes, and the preparation process thereof is not particularly limited.
In this embodiment, raw materials for the transparent powder coating composition, such as acrylic resin, curing agent, amide-modified phenolic urea surfactant, or other auxiliary agents, are commercially available, and the sources of raw materials are readily available.
Preferably, this embodiment provides a transparent coating, spraying the transparent powder coating composition described in this embodiment on a substrate, and forming the transparent coating after curing reaction; in this embodiment, the substrate may be a metal substrate or a non-metal substrate; preferably, in the present embodiment, a metal substrate is used as the substrate, and more preferably an aluminum substrate or an iron substrate is used; in particular, in the present embodiment, the substrate may be a related component of an automobile or other vehicles, or may be another related component having similar requirements, which is not particularly limited in this example.
Preferably, in the present embodiment, the base material is provided with a primer coating layer, and the transparent coating layer is used as a finishing coating layer of the primer coating layer; further, in the present embodiment, the undercoat layer may be specifically an ink-curable layer or a liquid-curable layer, and the film thickness thereof is preferably not more than 40 μm in general, and may be specifically selected according to practical circumstances.
In this embodiment, the thickness of the transparent coating layer can be specifically selected according to practical needs, and the proposed thickness range of the transparent coating layer is 60-100 μm (the test standard is ISO 2360-2017).
To further demonstrate the technical effects of the present application, the present application specifically conducted the following sets of examples as raw materials for formulations with clear powder coating compositions for specific test performance comparisons:
example 1: a transparent powder coating composition comprises the following raw materials in formula:
80wt% of an acrylic resin, with the trade name GMA15 epoxy acrylic resin from Ningbo south sea chemistry, which itself contains a leveling agent, the epoxy equivalent of which ranges from 510 to 550g/eq; the softening point is 100-110 ℃;
18wt% DDDA, manufacturer CATHAY BIOTECHNOLOGY;
1wt% of an amide modified phenolic urea surfactant, trade name from TROY542DG；
0.5% by weight of a UVA-resistant adjuvant, wherein "UVA" is an abbreviation for the English word "UltraViolet A", chinese meaning UltraViolet A;
0.5% by weight of a Hindered Amine Light Stabilizer (HALS), where "HALS" is an abbreviation for english "hindered amine light stabilizer".
The transparent powder coating composition is prepared by the procedures of weighing, premixing, melt extrusion, grinding, cyclone separation and the like of the raw materials in the formula.
Example 2: the remaining technical solutions of this example 2 are the same as those of example 1, except that in this example 2, the raw materials of the formulation of the transparent powder coating composition are as follows:
78wt% of acrylic resin;
18wt% DDDA;
1wt% of an amide modified phenolic urea surfactant;
1.5wt% of a UVA resistant adjuvant;
1.5% by weight of a Hindered Amine Light Stabilizer (HALS).
Example 3: the remaining technical solutions of this example 3 are the same as those of example 1, except that in this example 3, the raw materials of the formulation of the transparent powder coating composition are as follows:
80wt% of an acrylic resin;
18.5wt% DDDA;
1wt% of an amide modified phenolic urea surfactant;
0.5wt% alumina.
Example 4: the remaining technical solutions of this example 4 are the same as those of example 1, except that in this example 4, the raw materials of the formulation of the transparent powder coating composition are as follows:
85wt% of an acrylic resin;
12wt% DDDA;
1wt% of an amide modified phenolic urea surfactant;
1.5wt% of a UVA resistant adjuvant;
0.5wt% alumina.
Example 5: the remaining technical solutions of this example 5 are the same as those of example 1, except that in this example 5, the raw materials of the formulation of the transparent powder coating composition are as follows:
80wt% of acrylic resin, with the trade name of type A254 GMA acrylic resin from Dielsen DIC, and the epoxy equivalent weight range of the acrylic resin is 515-555g/eq;
19wt% DDDA;
1wt% of an amide modified phenolic urea surfactant.
Example 6: the remaining technical solutions of this example 6 are the same as those of example 1, except that in this example 6, the raw materials of the formulation of the transparent powder coating composition are as follows:
79wt% of acrylic resin, namely A254 type GMA acrylic resin of the DIC, and the epoxy equivalent weight range of the acrylic resin is 515-555g/eq;
19wt% DDDA;
1wt% of an amide modified phenolic urea surfactant;
1wt% leveling agent, brand Resifflow PL-200from ESTRON.
Example 7: the remaining technical solutions of this example 7 are the same as those of example 1, except that in this example 7, the raw materials of the formulation of the transparent powder coating composition are as follows:
80.5wt% acrylic resin;
19wt% DDDA;
0.5 wt.% of an amide modified phenolic urea surfactant.
Example 8: the remaining technical solutions of this example 8 are the same as those of example 1, except that in this example 8, the formulation raw materials of the transparent powder coating composition are as follows:
80.8wt% acrylic resin;
19wt% DDDA;
0.2 wt.% of an amide modified phenolic urea surfactant.
Example 9: the remaining technical solutions of this example 9 are the same as those of example 1, except that in this example 9, the raw materials of the formulation of the transparent powder coating composition are as follows:
80.9wt% acrylic resin;
19wt% DDDA;
0.1 wt.% of an amide modified phenolic urea surfactant.
Comparative example 1: the remaining technical solutions of this comparative example 1 are identical to example 1, except that: in this comparative example 1, the formulation raw materials of the transparent powder coating composition were as follows:
86.5wt% of a polyester resin, trade name from Allnex4642-3 having a viscosity at 200 ℃ in the range of 1500-2300mpa.s and an acid value in the range of 32-38mgKOH/g;
7wt% TGIC (abbreviation 1,3,5-Triglycidyl Isocyanurate, chinese meaning triglycidyl isocyanurate), HT-702 under the name Huang Shanhua;
1wt% of leveling agent with the trade name of Resiffow PL-200from ESTRON;
1wt% of an amide modified phenolic urea surfactant;
1.5wt% of a UVA resistant adjuvant;
2wt% of a hindered amine light stabilizer;
1wt% alumina.
Comparative example 2: the remaining technical solutions of this comparative example 2 are identical to example 1, except that: in this comparative example 2, the formulation raw materials of the transparent powder coating composition were as follows:
40wt% of epoxy resin, BE-502 epoxy resin supplied by vinca CCP;
53.5% by weight of a polyester resin, trade name Uralac P865 from DSM;
1wt% of leveling agent with the trade name of Resiffow PL-200from ESTRON;
1wt% of an amide modified phenolic urea surfactant;
1.5wt% of a UVA resistant adjuvant;
2wt% of a hindered amine light stabilizer;
1wt% alumina.
Comparative example 3: the remaining technical solutions of this comparative example 3 are identical to example 1, only with the difference that: in this comparative example 3, the formulation raw materials of the transparent powder coating composition were as follows:
80wt% of an acrylic resin;
18wt% DDDA;
0.5wt% of a UVA resistant adjuvant;
0.5wt% of a Hindered Amine Light Stabilizer (HALS);
1% by weight of degassing agent, in particular Benzoin Benzoin, with the brand name Microphone (MACKLIN).
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 formulation raw materials of the powder coating composition were as follows:
80wt% of acrylic resin, namely A255 type GMA acrylic resin with the brand of DIEYISDN, and the epoxy equivalent weight range of the acrylic resin is 515-555g/eq;
17wt% DDDA;
0.5wt% of a UVA resistant adjuvant;
1wt% of leveling agent with the trade name of Resiffow PL-200from ESTRON;
0.5wt% of a Hindered Amine Light Stabilizer (HALS);
1% by weight of degassing agent, in particular Benzoin Benzoin, with the brand name Microphone (MACKLIN).
To verify the transparent cover effect achieved by the present application, powder coating compositions were prepared for each of examples 1-9 and comparative examples 1-4 above, respectively, and these powder coating compositions were first tested for gel time and diagonal flow length, the test results being shown in table 1 below:
TABLE 1
Then, each of the powder coating compositions of examples 1 to 9 and comparative examples 1 to 4 was sprayed and cured (the curing conditions were uniformly selected to 175 ℃ C. @20 min) on the same type of aluminum substrate (on which a black ink cured coating layer having a thickness of about 20 μm was previously provided) to obtain cured coatings each having a film thickness of 60 to 100. Mu.m. The present application conducted a performance test comparison of each of the above cured coatings as shown in table 2 below:
TABLE 2
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 3 below.
TABLE 3 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 contains only one independent technical solution, and the description is provided for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the examples and the technical features independent of each other may also be combined appropriately to form other embodiments that can be understood by those skilled in the art.
Claims (6)
1. The transparent powder coating composition is characterized by at least comprising acrylic resin, a curing agent and a defoaming auxiliary agent, wherein the defoaming auxiliary agent is an amide modified phenolic urea surfactant; the acrylic resin comprises GMA acrylic resin; the curing agent is a dibasic acid curing agent; the gel time of the transparent powder coating composition at 180 ℃ ranges from 52 to 65 seconds, and the diagonal flow length at 180 ℃ is not less than 245mm; the acrylic resin accounts for not less than 70wt% of the transparent powder coating composition; the acrylic resin contains a leveling agent; the defoaming auxiliary agent accounts for 0.1-2.5wt% of the transparent powder coating composition; the weight part ratio of the curing agent to the acrylic resin is 1:8-1:3; the transparent powder coating composition is formed after curing reaction to obtain a transparent coating, and the transparent coating is used as a finishing coating of a bottom coating.
2. A clear powder coating composition as claimed in claim 1, wherein the defoamer aid has a melting point of 125 ± 3 ℃.
3. The transparent powder coating composition of claim 1, wherein the acrylic resin has an epoxy equivalent weight in the range of 450-600g/eq.
4. The clear powder coating composition of claim 1, further comprising an anti-aging aid and/or aluminum oxide.
5. A clear coat layer, characterized in that the clear coat layer is obtained by spraying the transparent powder coating composition according to any one of claims 1 to 4 onto a substrate, and shaping after curing reaction.
6. The clearcoat layer of claim 5, wherein the substrate has a basecoat layer disposed thereon, the clearcoat layer being a top coat layer of the basecoat layer.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6576336B1 (en) * | 1998-09-11 | 2003-06-10 | Unitech Corporation, Llc | Electrically conductive and electromagnetic radiation absorptive coating compositions and the like |
| KR20150071941A (en) * | 2013-12-19 | 2015-06-29 | 유림특수화학 주식회사 | Method of forming dry paint film with native rock powder |
| CN112680074A (en) * | 2020-12-29 | 2021-04-20 | 老虎表面技术新材料（苏州）有限公司 | Extinction ultralow-temperature curing powder coating composition and coating thereof |
| CN114921140A (en) * | 2022-05-17 | 2022-08-19 | 厦门彩绎科技有限公司 | Acrylic acid transparent powder coating for finishing |
| CN115260876A (en) * | 2021-04-30 | 2022-11-01 | 廊坊立邦涂料有限公司 | Low-temperature curing transparent coating powder suitable for automobile hub and preparation method |
-
2022
- 2022-12-23 CN CN202211667191.8A patent/CN115717013B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6576336B1 (en) * | 1998-09-11 | 2003-06-10 | Unitech Corporation, Llc | Electrically conductive and electromagnetic radiation absorptive coating compositions and the like |
| KR20150071941A (en) * | 2013-12-19 | 2015-06-29 | 유림특수화학 주식회사 | Method of forming dry paint film with native rock powder |
| CN112680074A (en) * | 2020-12-29 | 2021-04-20 | 老虎表面技术新材料（苏州）有限公司 | Extinction ultralow-temperature curing powder coating composition and coating thereof |
| CN115260876A (en) * | 2021-04-30 | 2022-11-01 | 廊坊立邦涂料有限公司 | Low-temperature curing transparent coating powder suitable for automobile hub and preparation method |
| CN114921140A (en) * | 2022-05-17 | 2022-08-19 | 厦门彩绎科技有限公司 | Acrylic acid transparent powder coating for finishing |
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