CN115960514A - Insulating powder coating composition and coating thereof - Google Patents
Insulating powder coating composition and coating thereof Download PDFInfo
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- CN115960514A CN115960514A CN202211657871.1A CN202211657871A CN115960514A CN 115960514 A CN115960514 A CN 115960514A CN 202211657871 A CN202211657871 A CN 202211657871A CN 115960514 A CN115960514 A CN 115960514A
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Abstract
The invention discloses an insulating powder coating composition and a coating thereof, wherein the raw materials at least comprise epoxy resin, a phenolic hydroxyl curing agent, a rheological additive and a filler, wherein the rheological additive comprises fumed silica treated by dimethyldichlorosilane, and the filler comprises a silica filler; according to the invention, the coating obtained after the insulating powder coating composition is sprayed and cured has a stable and reliable insulating effect, the problem of edge film thickness and edge fat of a sprayed workpiece can be well controlled, and the product yield is obviously improved.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to an insulating powder coating composition and a coating applied by the insulating powder coating composition.
Background
The thermosetting powder coating has the advantages of environmental protection, low energy consumption, convenient construction, no (at least little) VOC emission and the like, so the thermosetting powder coating is widely used for replacing paint and water-based paint to realize protection and decoration of products in various fields.
In some specific application occasions, for example, parts of new energy automobiles, in order to achieve an insulation protection effect, an insulation film is generally adhered to the parts, so that the operation process is complex, the construction difficulty is high, and bubbles are easily generated, so that frequent replacement and maintenance are required. At present, some technical schemes adopt thermosetting powder coating to obtain an insulating cured coating to replace an insulating film, however, after practical verification, the stability of the insulating property is found to be poor, and meanwhile, the problem of fat edge of a workpiece (namely, the problem of excessive film thickness at the edge of the workpiece) can occur, so that the product yield of the insulating cured coating is low.
Therefore, the applicant wishes to develop a new technical solution to solve the above technical problems.
Disclosure of Invention
In view of the above, the present invention provides an insulating powder coating composition and a coating thereof, and a coating obtained by spraying and curing the insulating powder coating composition provided by the present invention has a stable and reliable insulating effect, and can well control the problem of edge film thickness and edge fat of a sprayed workpiece, thereby significantly improving the yield of products.
The technical scheme adopted by the invention is as follows:
the raw materials of the insulating powder coating composition at least comprise epoxy resin, a phenolic hydroxyl curing agent, a rheological aid and a filler, wherein the rheological aid comprises fumed silica treated by dimethyldichlorosilane, and the filler comprises a silica filler.
Preferably, the rheological aid is present in a proportion of 0.2 to 5% by weight of the insulating powder coating composition and/or the silica filler is present in a proportion of 8 to 40% by weight of the insulating powder coating composition.
Preferably, the rheology adjuvant comprises 0.5-2.5wt% of the insulating powder coating composition by weight and/or the silica filler comprises 10-25wt% of the insulating powder coating composition by weight.
Preferably, the specific surface area of the fumed silica treated with dimethyldichlorosilane ranges from 90 to 130m 2 /g。
Preferably, the silica filler has a D90 particle size in the range of 25 to 45 microns, and/or the silica filler has a D50 particle size in the range of 8 to 15 microns.
Preferably, the epoxy resin accounts for not less than 40wt% of the insulating powder coating composition, and/or the weight ratio between the phenolic hydroxyl curing agent and the epoxy resin is 1.
Preferably, the epoxy equivalent of the epoxy resin ranges from 650 to 900g/eq; and/or the softening point temperature of the epoxy resin is in the range of 90-105 ℃; and/or the melt viscosity of the epoxy resin at 150 ℃ ranges from 3500 cps to 6000cps.
Preferably, the phenolic hydroxyl equivalent weight of the phenolic hydroxyl curing agent is in the range of 200-300g/eq; and/or the softening point temperature range of the phenolic hydroxyl curing agent is 70-90 ℃; and/or the gelling time of the phenolic hydroxyl curing agent and the epoxy resin at 180 ℃ is in the range of 20-60 seconds.
Preferably, the insulating powder coating composition is obtained by mixing, extruding and crushing the raw materials.
Preferably, the insulating coating is obtained by spraying the insulating powder coating composition on a substrate, and performing curing reaction and shaping.
It should be noted that throughout the present application, the D90, D50 particle size data referred to are obtained by performing a particle size distribution test by laser diffraction (e.g., using a malvern particle size analyzer 2000); the detection standard of the related epoxy equivalent is GB/T4612-2008; the detection standard according to which the softening point is concerned is GB/T4507-1999: the melting point referred to is according to the test standard ASTM F2625-07; the detection standard adopted by the related phenolic hydroxyl equivalent adopts ISO7142:2007Annex A; the gel time is referred to according to the test standard GB/T1699-1997.
Epoxy and phenolic hydroxyl curing agent are selected for use as the main part curing resin system of insulating powder coating composition to this application, simultaneously selected for use by the fumed silica after dimethyl dichlorosilane handles as specific rheological auxiliary agent and compound silica filler very much, and then obtain the insulating powder coating composition of this application, after on-the-spot practical application, prove to adopt the insulating powder coating composition that this application provided to carry out the spraying, the coating that obtains after the solidification not only has reliable and stable insulating effect, and can control the thick fat limit problem of edge film of spraying work piece well, the product yield has obviously been promoted.
Detailed Description
The embodiment of the application provides an insulating powder coating composition, which at least comprises epoxy resin, a phenolic hydroxyl curing agent, a rheological additive and a filler, wherein the rheological additive comprises fumed silica treated by dimethyldichlorosilane, and the filler comprises a silica filler; preferably, in order to further ensure the stability of the insulating effect, in the present embodiment, the cured film-forming material of the insulating powder coating composition is composed of an epoxy resin, a phenolic hydroxyl curing agent; of course, in the modified embodiment of the present application, other thermosetting resins and curing agents thereof having similar insulating effects may be appropriately added, which is not limited in the present application.
Preferably, in this embodiment, the rheology modifier comprises 0.2 to 5wt%, more preferably 0.5 to 2.5wt%, and still more preferably 0.5 to 1.5wt% of the insulating powder coating composition.
Preferably, in this embodiment, the proportion of silica filler by weight of the insulating powder coating composition is 8 to 40 wt.%, more preferably 10 to 25 wt.%, even more preferably 10 to 20 wt.%.
Preferably, in this embodiment, the fumed silica after treatment with dimethyldichlorosilane has a specific surface area in the range of 90 to 130m 2 /g。
Preferably, in this embodiment, the D90 particle size of the silica filler ranges from 25 to 45 microns, more preferably from 30 to 40 microns, and even more preferably from 32 to 37 microns; preferably, in this embodiment, the silica filler has a D50 particle size in the range of 8 to 15 microns, more preferably 10 to 15 microns, and even more preferably 12 to 14 microns.
In order to facilitate the curing effect of the coating, the epoxy resin preferably accounts for not less than 40wt%, more preferably 40 to 65wt%, and still more preferably 40 to 55wt% of the insulating powder coating composition in the present embodiment; preferably, in the present embodiment, the weight ratio of the phenolic hydroxyl curing agent to the epoxy resin is 1.
In order to facilitate the curing effect of the cured coating, preferably, in the present embodiment, the epoxy equivalent of the epoxy resin ranges from 650 to 900g/eq, more preferably from 700 to 850g/eq, and still more preferably from 720 to 800g/eq; preferably, in this embodiment, the epoxy resin has a softening point temperature in the range of 90 to 105 ℃, more preferably 90 to 100 ℃; preferably, in this embodiment, the melt viscosity of the epoxy resin is in the range of 3500 cps to 6000cps at 150 ℃.
In order to facilitate the film-forming effect of the cured coating, preferably, in the present embodiment, the phenolic hydroxyl equivalent of the phenolic hydroxyl curing agent is in the range of 200 to 300g/eq, more preferably 220 to 280g/eq, and further preferably 220 to 260g/eq; preferably, in the present embodiment, the softening point temperature of the phenolic hydroxyl curing agent is in the range of 70 to 90 ℃; in the present embodiment, the gel time of the phenolic hydroxyl curing agent and the epoxy resin at 180 ℃ is preferably 20 to 60 seconds, more preferably 25 to 55 seconds, and still more preferably 25 to 50 seconds.
Preferably, other well-known additives, such as leveling agents, degassing agents, antioxidants, dispersants, pigments, fillers, stabilizers, flow agents, waxes and/or other additives, and the like, are optionally added to the powder coating composition when practiced herein, and are generally selected by those of ordinary skill in the art. In the present embodiment, the insulating powder coating composition of the present invention can be prepared by a known process such as mixing raw materials, extruding, and crushing, but it is needless to say that the insulating powder coating composition of the present embodiment can be obtained by another known preparation process, and the preparation process is not particularly limited in the present invention.
In the present embodiment, the raw materials of the insulating powder coating composition, for example, the epoxy resin, the phenolic hydroxyl curing agent, the rheological aid, the filler, and other aids, can be purchased directly on the market, and the raw material sources are easily available.
Preferably, this embodiment provides an insulating coating, wherein the insulating powder coating composition as described above in this embodiment is sprayed on a substrate, and subjected to a curing reaction to form the insulating coating. In the present embodiment, the substrate may be a metal substrate or a non-metal substrate; preferably, in the present embodiment, the substrate is a metal substrate, and more preferably, an aluminum substrate or a ferrous substrate.
In the present embodiment, the thickness of the insulating coating can be specifically selected according to actual needs, and the suggested coating thickness is in the range of 100-300 μm, more preferably 150-250 μm, and still more preferably 180-220 μm (the test standard is according to ISO 2360-2017).
To further verify the technical effects of the present application, the present application specifically performs the following tests on the following examples as the formulation raw materials of the insulating powder coating composition:
example 1: an insulating powder coating composition comprises the following raw materials in formula:
50wt% of EPOXY RESIN, namely NPES-903H of NAN YA EPOXY RESIN, wherein the EPOXY equivalent range is 740-800g/eq, the softening point temperature range is 92-100 ℃, and the melt viscosity range at 150 ℃ is 3500-6000cps;
20wt% of phenolic hydroxyl curing agent with the brand number of KD-420 of KUKDO, the equivalent range of the phenolic hydroxyl is 230-260g/eq, the temperature range of the softening point is 73-85 ℃, and the gelling time of the curing agent and the epoxy resin at 180 ℃ is 20-60 seconds;
1% by weight of fumed silica treated with dimethyldichlorosilane under the trademark
R972 with a specific surface area ranging from 90 to 130m 2 /g；
1wt% of leveling agent, which is RESIFLOW PV-67C of ESTRON;
28wt% silica, SAC S-SIL C301, having a D90 particle size of 35.1 microns and a D50 particle size in the range of 13.7 microns.
The insulating powder coating composition is prepared by the following working 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 formulation raw materials of the insulating powder coating composition are as follows:
55wt% of an epoxy resin;
22wt% of phenolic hydroxyl curing agent;
2wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
20wt% silica.
Example 3: the remaining technical solution of this example 3 is the same as that of example 1, except that in this example 3, the formulation raw materials of the insulating powder coating composition are as follows:
60wt% of an epoxy resin;
25wt% of phenolic hydroxyl curing agent;
1.5wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
12.5wt% silica.
Example 4: the remaining technical solution of this example 4 is the same as that of example 1, except that in this example 4, the formulation raw materials of the insulating powder coating composition are as follows:
45wt% of an epoxy resin;
16wt% of a phenolic hydroxyl curing agent;
0.5wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
15wt% silica;
22.5wt% barium sulfate BaSO 4 Chemical engineering with grade of Shunde district of Fushan CitySHUANGYI 2008.
Example 5: the remaining technical solution of this example 5 is the same as that of example 1, except that in this example 5, the formulation raw materials of the insulating powder coating composition are as follows:
40wt% of an epoxy resin;
15wt% of phenolic hydroxyl curing agent;
0.5wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
18.5wt% silica;
25wt% barium sulfate BaSO 4 The grade is SHUANGYI 2008 of Shunjie chemical engineering in Changde district of Fushan city.
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 formulation raw materials of the insulating powder coating composition are as follows:
50wt% of an epoxy resin;
20wt% of phenolic hydroxyl curing agent;
1wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent, namely an ESTRON P67A leveling agent;
27.9wt% silica;
0.1wt% of a catalyst, in particular an imidazole-based curing accelerator which is commercially available.
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 formulation raw materials of the insulating powder coating composition are as follows:
50wt% of epoxy resin, namely BE-503 of chemical engineering (Jiangsu) of Changchun, wherein the epoxy equivalent range is 740-780g/eq, and the softening point temperature range is 92-100 ℃;
20wt% of phenolic hydroxyl curing agent;
1wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
28wt% silica.
Comparative example 1: the remaining technical solutions of comparative example 1 are different from example 1 only in that: in this comparative example 1, the formulation of the insulating powder coating composition was as follows:
50wt% of an epoxy resin;
20wt% of phenolic hydroxyl curing agent;
1wt% of a leveling agent;
29wt% silica.
Comparative example 2: the rest of the technical scheme of the comparative example 2 is different from the embodiment 1 only in that: in comparative example 2, the formulation of the insulating powder coating composition was as follows:
50wt% of an epoxy resin;
20wt% of phenolic hydroxyl curing agent;
1wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
28wt% barium sulfate BaSO 4 The grade is SHUANGYI 2008 of Shunjie chemical engineering in Changde district of Fushan city.
Comparative example 3: the remaining technical solutions of comparative example 3 are different from example 1 only in that: in this comparative example 3, the formulation of the insulating powder coating composition was as follows:
50wt% of an epoxy resin;
20wt% of phenolic hydroxyl curing agent;
1% by weight of benzoin (commercially available product);
1wt% of a leveling agent;
28wt% silica.
Comparative example 4: the other technical scheme of the comparative example 4 is the same as that of the example 1, and the difference is only that: in this comparative example 4, the formulation of the insulating powder coating composition was as follows:
35wt% of an epoxy resin;
35wt% of polyester resin, and the grade is smooth GH-1255 polyester resin;
1wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
28wt% silica.
Comparative example 5: the rest of the technical scheme of the comparative example 5 is the same as that of the example 1, and the difference is only that: in this comparative example 5, the formulation of the insulating powder coating composition was as follows:
61wt% of an acrylic resin (trade name: GMA acrylic resin type a254 from dear);
9wt% of a DDDA curing agent (from ningbojel chemical), wherein DDDA is an abbreviation for "docandioic acid" in english, wherein the meaning means; dodecanedioic acid;
1wt% fumed silica treated with dimethyldichlorosilane;
1wt% of a leveling agent;
28wt% silica.
In order to verify the insulation effect obtained by the present application, the powder coating compositions prepared in the present application for each of examples 1 to 7 and comparative examples 1 to 5 were respectively sprayed and cured (curing conditions were uniformly selected as: 190 ℃ @15 min) on the same type of aluminum substrate to obtain cured coatings, and the thickness of each cured coating was 180 to 220 μm. The present application performed the following comparison of performance tests shown in table 1 for each of the above cured coatings:
TABLE 1
| Breakdown voltage (kV) | Leakage current (mA) | |
| Example 1 | >6 | <0.05 |
| Example 2 | >6 | <0.05 |
| Example 3 | >6 | <0.05 |
| Example 4 | >6 | <0.05 |
| Example 5 | >6 | <0.05 |
| Example 6 | >6 | <0.05 |
| Example 7 | >6 | <0.05 |
| Comparative example 1 | >6 | <0.05 |
| Comparative example 2 | 2.5-6.0 | 0.05-0.1 |
| Comparative example 3 | >6 | <0.05 |
| Comparative example 4 | 2.5-5.5 | 0.1-0.5 |
| Comparative example 5 | 2.5-6.0 | 0.1-0.5 |
In order to further test the performance reliability of the embodiment, the application conducts construction trial on the insulating powder coating compositions provided by the above embodiments 1-7 and comparative examples 1-3 on new energy automobile parts (specifically, automobile battery installation shell workpieces), four groups of automobile battery installation shell workpieces with the same specification are respectively prepared for each embodiment and comparative example, and each automobile battery installation shell workpiece is respectively sprayed and cured (the curing conditions are uniformly selected to be 190 ℃ for @15 min) to respectively obtain a cured coating, wherein the film thickness of the cured coating ranges from 200 to 250 micrometers. The present application performs a comparison of the performance tests shown in table 2 below for each of the cured coatings above:
wherein, when the breakdown voltage (kV) of the cured coating is larger than 3kV and the leakage current is less than or equal to 1mA, the corresponding embodiment or comparative example of the group of cured coatings is marked as an insulation qualified product.
TABLE 2
It should be noted that the performance test according to the present example or comparative example was performed according to the test standards or conditions described in the following table 3.
TABLE 3 test items and test standards 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 attributes 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 description refers to embodiments, not every embodiment may include only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments and features independent of each other may also be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The insulating powder coating composition is characterized in that raw materials at least comprise epoxy resin, a phenolic hydroxyl curing agent, a rheological additive and a filler, wherein the rheological additive comprises fumed silica treated by dimethyldichlorosilane, and the filler comprises a silica filler.
2. The insulated powder coating composition of claim 1, wherein the rheology modifier comprises 0.2 to 5wt% of the insulated powder coating composition and/or the silica filler comprises 8 to 40wt% of the insulated powder coating composition.
3. The insulated powder coating composition of claim 1, wherein the rheology modifier comprises 0.5 to 2.5wt% of the insulated powder coating composition and/or the silica filler comprises 10 to 25wt% of the insulated powder coating composition.
4. The insulating powder coating composition according to claim 1, wherein the fumed silica treated with dimethyldichlorosilane has a specific surface area in the range of 90-130m 2 /g。
5. The insulated powder coating composition of claim 1, wherein the silica filler has a D90 particle size in the range of 25-45 microns and/or the silica filler has a D50 particle size in the range of 8-15 microns.
6. The insulated powder coating composition of claim 1, wherein the epoxy resin comprises not less than 40wt% of the insulated powder coating composition, and/or the ratio between the phenolic hydroxyl curing agent and the epoxy resin is 1.
7. The insulated powder coating composition of claim 1, wherein the epoxy resin has an epoxy equivalent weight in the range of 650-900g/eq; and/or the softening point temperature of the epoxy resin is in the range of 90-105 ℃; and/or the epoxy resin has a melt viscosity in the range of 3500 to 6000cps at 150 ℃.
8. The insulated powder coating composition of claim 1, wherein the phenolic hydroxyl curing agent has a phenolic hydroxyl equivalent weight in the range of 200-300g/eq; and/or the softening point temperature range of the phenolic hydroxyl curing agent is 70-90 ℃; and/or the gelling time of the phenolic hydroxyl curing agent and the epoxy resin at 180 ℃ is in the range of 20-60 seconds.
9. The insulated powder coating composition of claim 1, wherein said insulated powder coating composition is obtained by mixing, extruding and crushing said raw materials.
10. An insulating coating, characterized in that an insulating powder coating composition according to any one of claims 1 to 9 is sprayed onto a substrate and, after a curing reaction, is shaped to give the insulating coating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211657871.1A CN115960514A (en) | 2022-12-22 | 2022-12-22 | Insulating powder coating composition and coating thereof |
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| CN202211657871.1A CN115960514A (en) | 2022-12-22 | 2022-12-22 | Insulating powder coating composition and coating thereof |
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Citations (4)
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| US6096807A (en) * | 1993-07-06 | 2000-08-01 | Basf Coatings Ag | Powder coating, process for the exterior coating of metal pipes, and use of the powder coating for the one-layer exterior coating of metal pipes |
| CN1310144A (en) * | 2000-02-16 | 2001-08-29 | 日立电线株式会社 | Partial discharge resistant conductor enamel composition and partial discharge resistant magnetic conductor |
| CN111032799A (en) * | 2017-08-10 | 2020-04-17 | 日涂工业涂料有限公司 | Powder coating composition |
| WO2022048992A1 (en) * | 2020-09-03 | 2022-03-10 | Siemens Aktiengesellschaft | Powder coating formulation for an insulation system of an electric machine, electric machine having an insulation system of this kind, and a method for producing an insulation system of this kind |
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2022
- 2022-12-22 CN CN202211657871.1A patent/CN115960514A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6096807A (en) * | 1993-07-06 | 2000-08-01 | Basf Coatings Ag | Powder coating, process for the exterior coating of metal pipes, and use of the powder coating for the one-layer exterior coating of metal pipes |
| CN1310144A (en) * | 2000-02-16 | 2001-08-29 | 日立电线株式会社 | Partial discharge resistant conductor enamel composition and partial discharge resistant magnetic conductor |
| CN111032799A (en) * | 2017-08-10 | 2020-04-17 | 日涂工业涂料有限公司 | Powder coating composition |
| WO2022048992A1 (en) * | 2020-09-03 | 2022-03-10 | Siemens Aktiengesellschaft | Powder coating formulation for an insulation system of an electric machine, electric machine having an insulation system of this kind, and a method for producing an insulation system of this kind |
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