CN112888162A - Double-sided composite aluminum sheet - Google Patents
Double-sided composite aluminum sheet Download PDFInfo
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- CN112888162A CN112888162A CN202110038520.1A CN202110038520A CN112888162A CN 112888162 A CN112888162 A CN 112888162A CN 202110038520 A CN202110038520 A CN 202110038520A CN 112888162 A CN112888162 A CN 112888162A
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- aluminum sheet
- sheet body
- resin
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 133
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 115
- 238000000576 coating method Methods 0.000 claims abstract description 115
- 229920005989 resin Polymers 0.000 claims abstract description 74
- 239000011347 resin Substances 0.000 claims abstract description 74
- 239000003822 epoxy resin Substances 0.000 claims abstract description 16
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- 239000002518 antifoaming agent Substances 0.000 claims description 35
- 239000002904 solvent Substances 0.000 claims description 24
- 238000009498 subcoating Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 18
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical group O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 16
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical group CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 claims description 16
- 239000003431 cross linking reagent Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 13
- 229910052791 calcium Inorganic materials 0.000 claims description 13
- 239000011575 calcium Substances 0.000 claims description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003973 paint Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 12
- 239000000049 pigment Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229940116333 ethyl lactate Drugs 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 239000003085 diluting agent Substances 0.000 claims description 6
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical group CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 2
- 229920003180 amino resin Polymers 0.000 claims description 2
- 150000008064 anhydrides Chemical class 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000012948 isocyanate Substances 0.000 claims description 2
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000000454 talc Substances 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 4
- MWSKJDNQKGCKPA-UHFFFAOYSA-N 6-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical group C1CC(C)=CC2C(=O)OC(=O)C12 MWSKJDNQKGCKPA-UHFFFAOYSA-N 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000006748 scratching Methods 0.000 description 3
- 230000002393 scratching effect Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 206010024796 Logorrhoea Diseases 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/05—Insulated conductive substrates, e.g. insulated metal substrate
- H05K1/056—Insulated conductive substrates, e.g. insulated metal substrate the metal substrate being covered by an organic insulating layer
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09009—Substrate related
- H05K2201/09109—Locally detached layers, e.g. in multilayer
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Drilling And Boring (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a double-sided composite aluminum sheet, which comprises: the aluminum sheet body is respectively provided with an anti-flash resin coating and an accurate alignment resin layer on two side surfaces of the aluminum sheet body; the thickness of the anti-flash resin coating is 10-60 mu m, and the hardness is 4-9H; the thickness of the coating of the accurate alignment resin layer is 40-140 mu m, and the hardness is 2B-H. According to the invention, one surface coated with the anti-burr resin coating is covered on the circuit board, the accurate alignment resin layer faces the drill point, the drill point can contact the accurate alignment layer firstly during drilling, the accurate alignment layer is made of epoxy resin materials, the hardness of the accurate alignment layer is 2B-H, the accurate alignment layer can stick and fix the position of the drill point head, the positioning effect during drilling under the drill point is achieved, and the hole position positioning accuracy of the processed circuit board is improved.
Description
Technical Field
The invention relates to the technical field of circuit board processing, in particular to a double-sided composite aluminum sheet.
Background
Since most circuit boards have mounting holes for mounting and through holes for conduction, the circuit boards need to be drilled. In order to improve the drilling precision, the surface of the circuit board is covered with a layer of aluminum sheet, so that the drill point can be conveniently and accurately positioned. Although the positioning of the drill point can be effectively improved by covering a layer on the surface of the circuit board, new problems also occur, when the drill point drills through an aluminum sheet, a burr is easily generated on a hole drilled by the drill point on the aluminum sheet, and the burr is very easy to scratch the circuit board and influence the appearance of the circuit board; in severe cases, the burrs can scratch the green oil insulation layer on the surface of the circuit board, which affects the insulation performance of the circuit board. And the hardness of the circuit board has a large difference with the hardness of the aluminum sheet, after the drill point drills the aluminum sheet, the drill point directly drills the circuit board layer, but the drill point directly impacts the hard circuit board material, so that the edge of the hole is easy to be notched and flapped, and the quality of the hole is seriously influenced. Although the aluminum sheet can well improve the drilling precision, the hole diameter drilled by the circuit board is extremely small, the diameter of the drill point is also very small, and the contact between the drill point and the aluminum sheet is hard to touch, so that the situation of needle breakage is easy to occur when the drill point rotating at a high speed touches the aluminum sheet, and if the needle breakage occurs, the machine must be stopped to replace the drill point, and the production efficiency is seriously influenced.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the double-sided composite aluminum sheet is provided, and burrs of the drill point are avoided when the drill point drills, so that the appearance and the insulating property of a circuit board are prevented from being influenced, and the probability of breakage of the drill point is reduced.
The technical scheme of the invention is as follows: providing a double-sided composite aluminum sheet, comprising: the aluminum sheet body is respectively provided with an anti-flash resin coating and an accurate alignment resin layer on two side surfaces of the aluminum sheet body; the thickness of the anti-flash resin coating is 10-60 mu m, and the hardness is 4-9H; the thickness of the coating of the accurate alignment resin layer is 40-140 mu m, and the hardness is 2B-H. In this scheme, pencil hardness is used. Preferably, the thickness of the aluminum sheet body is as follows: 0.1mm-0.25 mm.
During the application, will scribble and prevent covering a knife or a sword resin coating's a face lid on the circuit board, accurate counterpoint resin layer towards the drill point, can contact accurate counterpoint layer earlier during the drill point drilling, because accurate counterpoint layer adopts the epoxy material, and its hardness is 2B ~ H, because the epoxy material has the solidification convenience, the adhesion is strong, and the shrink nature is low, and mechanical properties is stable, and chemical stability is high, dimensional stability. The surface adhesion of the accurate alignment layer is strong and the surface hardness is lower than that of the aluminum sheet body; the position of accurate counterpoint layer can glue and fix the drill point head plays the location effect when the drill point drills down, reaches the hole site positioning accuracy who improves the circuit board drilling of processing. Because of accurate counterpoint layer surface hardness is softer than this body surface of aluminum sheet, make the drill point bore through accurate counterpoint layer more easily, and accurate counterpoint layer can provide a buffering for drill point and aluminum sheet body, need not bump hard like current ordinary aluminum sheet is direct hard, reduce the knife face wearing and tearing of drill point, can better guarantee the sharpness of drill point knife face, reduced the drilling in-process and lead to disconnected needle because of the surface is too hard, the piece that produces when simultaneously can also making drilling in time discharges in the outside, make the inside pore wall surface of drilling after being bored by the drill point more level and more smooth, so reach and improve the interior quality of circuit board drilling of processing.
When the drill point drills into the anti-burring resin coating from the aluminum sheet body, the anti-burring resin coating is harder and firmly attached to the aluminum sheet body, namely, the bonding surface of the aluminum sheet body and the anti-burring resin coating is firmly pressed, so that the generation of burrs can be effectively inhibited, and the burrs are prevented from scratching the appearance and the insulating layer of the circuit board. The hardness of the circuit board is greatly different from that of the aluminum sheet body, the hardness of the anti-burring resin layer is between that of the aluminum sheet body and that of the circuit board, and the anti-burring resin layer is tightly attached to the circuit board layer, so that the anti-burring resin layer serves as a transition layer of hardness, transition is provided when a drill bit drills a hard circuit board, gaps and burrs at the edge of a hole when the drill bit drills the circuit board are inhibited, and the drilling quality is improved.
The hardness of the anti-burring resin layer is 4H-9H, and the hardness is between the hardness of the circuit board and the hardness of the aluminum sheet body, so that the anti-burring resin layer can provide a hardness transition for the drill point, the drill point can be conveniently drilled, and the probability of needle breakage caused by the fact that the drill point directly drills the circuit board with high hardness is reduced.
Preferably, the anti-flash resin coating consists of a plurality of sub-coatings; and in the two adjacent subcoats, the subcoat close to the aluminum sheet body has high hardness. Also in two adjacent subcoatings, keep away from the subcoating hardness of aluminum sheet body and slightly littleer, outside subcoating alright can provide moderate pliability for inside subcoating, avoid the drill point to bore when too fast, the drill point bores the coating of garrulous great area, has also avoided preventing that flash resin coating piece scrapes colored circuit board and insulating layer.
Further, the anti-flash resin coating is formed by drying an anti-flash coating coated on the aluminum sheet body, and the anti-flash coating is prepared from the following raw materials: 30-50 wt% of resin, 10-25 wt% of cross-linking agent, 0.01-50 wt% of filler, 0.1-2 wt% of defoaming agent, 0.1-2 wt% of flatting agent and the balance of solvent; the resin is at least one of epoxy resin, polyester, organic silicon resin, inorganic silicon resin and hybrid resin; the cross-linking agent is at least one of amines, anhydride curing agents, amino resin and isocyanate; the defoaming agent is an organic silicon defoaming agent or a silicon-free defoaming agent, the leveling agent is an organic silicon leveling agent or a silicon-free leveling agent, and the solvent is a solvent with a boiling point higher than 100 ℃.
Further, accurate counterpoint resin layer is dried for the counterpoint dope layer of coating on the aluminum sheet body and is formed, the raw materials of counterpoint coating constitute: 76.1-80.1 wt% of diluent and 5.3-6.1 wt% of coating pigment; 3.5-4.2 wt% of calcium powder, 2.8-3.8 wt% of defoaming agent, 4.21-5.0 wt% of complex and 2.6-2.8 wt% of flatting agent; the diluent is ethyl lactate, and the coating pigment is epoxy resin; the calcium powder is calcium carbonate, the defoaming agent is a BYK defoaming agent, the complex is a boron trioxide complex, and the leveling agent is a BYK leveling agent.
Further, the solvent is ethylene glycol ethyl ether and/or isophorone, and the filler is at least one of calcium carbonate, talcum powder, corundum powder and silicon oxide.
Further, the preparation method of the anti-flash coating comprises the following steps: adding resin and a solvent into a reaction vessel, and then adding a filler and a crosslinking agent while stirring to obtain a mixture; and adding a defoaming agent and a flatting agent into the mixture to be fully and uniformly mixed, and then standing for defoaming to obtain the required anti-flash coating.
Further, the preparation method of the para-position coating comprises the following steps: respectively placing epoxy resin, calcium powder, a boron trioxide complex, ethyl lactate, a BYK defoaming agent and a BYK flatting agent into a container, and fully stirring to fully mix the materials together to obtain a granular coating; and pouring the granular coating into a three-roll grinder for grinding, and obtaining the para-position coating after the materials of the granular coating are fused together.
Further, the preparation method of the double-sided composite aluminum sheet comprises the following steps.
S1: inspecting the surface of the aluminum sheet body to check whether burrs or burrs exist; if the burrs or burrs exist, removing the burrs or burrs on the aluminum sheet body; and obtaining the aluminum sheet body with a smooth surface.
S2: and cleaning and drying the aluminum sheet body with a smooth surface, and removing dust, impurities and oil stains on the surface of the aluminum sheet body.
S3: and coating the alignment coating on the surface of the aluminum sheet body in a roll coating manner.
S4: the aluminum sheet body coated with the para-position coating is baked at the temperature of 200 ℃ for 120 seconds to obtain a para-position aluminum sheet body; and inspecting the aluminum sheet body.
S5: and (4) coating the prepared anti-flash coating on the aligned aluminum sheet body processed in the step (S4) by using a coating machine.
S6: sending the aligned aluminum sheet body coated with the anti-flash coating into a drying oven for drying at the baking temperature of 200 +/-6 ℃ for 180 +/-10 seconds to obtain a double-sided composite aluminum sheet; and (5) inspecting the double-sided composite aluminum sheet.
Preferably, the formula proportion of the para-position coating component is that the thinner accounts for 79.8 wt%, and the coating pigment accounts for 6 wt%; the calcium powder accounts for 4 wt%, the BYK defoaming agent accounts for 3 wt%, the complex accounts for 4.5 wt%, and the BYK leveling agent accounts for 2.7 wt%.
By adopting the scheme, the invention provides the double-sided composite aluminum sheet, one side coated with the anti-burring resin coating is covered on the circuit board, the accurate alignment resin layer faces the drill point, the drill point can contact the accurate alignment layer firstly during drilling, the accurate alignment layer is made of epoxy resin materials, the hardness of the accurate alignment layer is 2B-H, the accurate alignment layer can be adhered to and fix the position of the drill point head, the positioning effect during drilling under the drill point is achieved, and the hole site positioning precision of the processed circuit board is improved. Because of accurate counterpoint layer surface hardness is softer than this body surface of aluminum sheet, make the drill point bore through accurate counterpoint layer more easily, and accurate counterpoint layer can provide a buffering for drill point and aluminum sheet body, need not bump hard like current ordinary aluminum sheet is direct hard, reduce the knife face wearing and tearing of drill point, can better guarantee the sharpness of drill point knife face, reduced the drilling in-process and lead to disconnected needle because of the surface is too hard, the piece that produces when simultaneously can also making drilling in time discharges in the outside, make the inside pore wall surface of drilling after being bored by the drill point more level and more smooth, so reach and improve the interior quality of circuit board drilling of processing. When the drill point drills into the anti-burring resin coating from the aluminum sheet body, the anti-burring resin coating is harder and firmly attached to the aluminum sheet body, namely, the bonding surface of the aluminum sheet body and the anti-burring resin coating is firmly pressed, so that the generation of burrs can be effectively inhibited, and the burrs are prevented from scratching the appearance and the insulating layer of the circuit board.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Example 1
Referring to fig. 1, the present invention provides a double-sided composite aluminum sheet, including: an aluminum sheet body 10, an anti-flash resin coating 20 and a precise alignment resin layer 30 respectively arranged on two side surfaces of the aluminum sheet body 10; the thickness of the anti-flash resin coating 20 is 10-60 μm, and the hardness is 4-9H; the thickness of the coating of the accurate alignment resin layer 30 is 40-140 μm, and the hardness is 2B-H. In this embodiment, the thickness of the aluminum sheet body is 0.1 mm.
The anti-flash resin coating 20 is formed by drying a coating coated on the aluminum sheet body 10, and comprises the following raw materials: 30 wt% of resin, 10 wt% of cross-linking agent, 25 wt% of filler, 0.1 wt% of defoaming agent, 0.1 wt% of flatting agent and the balance of solvent; the resin is epoxy resin E44; the cross-linking agent is methyl tetrahydrophthalic anhydride; the defoaming agent is BYK-A535; the leveling agent is BYK-346, and the solvent is a solvent with a boiling point higher than 100 ℃. Preferably, the solvent is ethylene glycol ethyl ether. The filler is corundum powder.
Accurate counterpoint resin layer 30 is dried for the counterpoint dope layer of coating on aluminum sheet body 10 and is formed, the raw materials of counterpoint paint constitute: the thinner accounts for 79.8 weight percent, and the coating pigment accounts for 6 weight percent; the calcium powder accounts for 4 wt%, the BYK defoaming agent accounts for 3 wt%, the complex accounts for 4.5 wt%, and the BYK leveling agent accounts for 2.7 wt%; the diluent is ethyl lactate, and the coating pigment is epoxy resin E44; the calcium powder is calcium carbonate, the BYK defoaming agent is BYK-A535 defoaming agent, the complex is boron trioxide complex, and the BYK flatting agent is BYK-346 flatting agent.
The preparation method of the anti-flash coating comprises the following steps: adding resin and a solvent into a reaction vessel, and then adding a filler and a crosslinking agent while stirring to obtain a mixture; and adding a defoaming agent and a flatting agent into the mixture to be fully and uniformly mixed, and then standing for defoaming to obtain the required anti-flash coating.
The preparation method of the para-position coating comprises the following steps: respectively placing epoxy resin, calcium powder, a boron trioxide complex, ethyl lactate, a BYK-A535 defoaming agent and a BYK-A535 flatting agent into a container, and fully stirring to fully mix the materials together to obtain a granular coating; and pouring the granular coating into a three-roll grinder for grinding, and obtaining the para-position coating after the materials of the granular coating are fused together.
The preparation method of the double-sided composite aluminum sheet comprises the following steps.
S1: inspecting the surface of the aluminum sheet body 10 to check whether burrs or burrs exist; if the burrs or burrs exist, removing the burrs or burrs on the aluminum sheet body 10; an aluminum sheet body 10 having a flat surface is obtained.
S2: the aluminum sheet body 10 with a smooth surface is cleaned and dried, and dust, impurities and oil stains on the surface of the aluminum sheet body 10 are removed.
S3: and coating the alignment coating on the surface of the aluminum sheet body 10 in a roll coating manner.
S4: the aluminum sheet body 10 coated with the para-position coating is baked at the temperature of 200 ℃ for 120 seconds to obtain a para-position aluminum sheet body 10; the aluminum sheet body 10 is inspected.
S5: and (4) coating the prepared anti-flash coating on the aligned aluminum sheet body 10 processed in the step S4 by using a coater.
S6: sending the aligned aluminum sheet body 10 coated with the anti-flash coating into a drying oven for drying at the baking temperature of 200 +/-6 ℃ for 180 +/-10 seconds to obtain a double-sided composite aluminum sheet; and (5) inspecting the double-sided composite aluminum sheet.
Example 2
Referring to fig. 2, the present invention provides a double-sided composite aluminum sheet, including: an aluminum sheet body 10, an anti-flash resin coating 20 and a precise alignment resin layer 30 respectively arranged on two side surfaces of the aluminum sheet body 10; the thickness of the anti-flash resin coating 20 is 10-60 μm, and the hardness is 4-9H; the thickness of the coating of the accurate alignment resin layer 30 is 40-140 μm, and the hardness is 2B-H. In this embodiment, the thickness of the aluminum sheet body is 0.25 mm.
The flash-resistant resin coating 20 is composed of two sub-coatings: an inner sub-coat layer 21, an outer sub-coat layer 22 coated on the inner sub-coat layer 21; the inner subcoating 21 near the aluminum sheet body 10 has a large hardness. That is, the hardness of the outer sub-coating 22 far away from the aluminum sheet body 10 is slightly lower, and the outer sub-coating 22 can provide moderate flexibility for the inner sub-coating 21, so that the drill bit is prevented from drilling a large area of coating when the drill bit is drilled too fast, and the phenomenon that the burr-proof resin coating 20 scraps scratch the circuit board and the insulating layer is also avoided.
In this embodiment, the inner sub-coating 21 is formed by drying a paint coated on the aluminum sheet body 10, and the paint of the outer sub-coating 22 is composed of the following raw materials: 30 wt% of resin, 10 wt% of cross-linking agent, 25 wt% of filler, 0.1 wt% of defoaming agent, 0.1 wt% of flatting agent and the balance of solvent; the resin is epoxy resin E44; the cross-linking agent is methyl tetrahydrophthalic anhydride; the defoaming agent is BYK-A535; the leveling agent is BYK-346, and the solvent is a solvent with a boiling point higher than 100 ℃. Preferably, the solvent is ethylene glycol ethyl ether. The filler is corundum powder.
The outer side sub-coating 22 is formed by drying the paint coated on the inner side sub-coating 21, and the paint of the outer side sub-coating 22 comprises the following raw materials: 30 wt% of resin, 10 wt% of cross-linking agent, 20 wt% of filler, 0.1 wt% of defoaming agent, 0.1 wt% of flatting agent and the balance of solvent; the resin is epoxy resin E44; the cross-linking agent is methyl tetrahydrophthalic anhydride; the defoaming agent is BYK-A535; the leveling agent is BYK-346, and the solvent is a solvent with a boiling point higher than 100 ℃. Preferably, the solvent is ethylene glycol ethyl ether. The filler is corundum powder.
Accurate counterpoint resin layer 30 is dried for the counterpoint dope layer of coating on aluminum sheet body 10 and is formed, the raw materials of counterpoint paint constitute: the thinner accounts for 79.8 weight percent, and the coating pigment accounts for 6 weight percent; the calcium powder accounts for 4 wt%, the BYK defoaming agent accounts for 3 wt%, the complex accounts for 4.5 wt%, and the BYK leveling agent accounts for 2.7 wt%; the diluent is ethyl lactate, and the coating pigment is epoxy resin E44; the calcium powder is calcium carbonate, the BYK defoaming agent is BYK-A535 defoaming agent, the complex is boron trioxide complex, and the BYK flatting agent is BYK-346 flatting agent.
The preparation method of the anti-flash coating comprises the following steps: adding resin and a solvent into a reaction vessel, and then adding a filler and a crosslinking agent while stirring to obtain a mixture; and adding a defoaming agent and a flatting agent into the mixture to be fully and uniformly mixed, and then standing for defoaming to obtain the required anti-flash coating.
The preparation method of the para-position coating comprises the following steps: respectively placing epoxy resin, calcium powder, a boron trioxide complex, ethyl lactate, a BYK-A535 defoaming agent and a BYK-A535 flatting agent into a container, and fully stirring to fully mix the materials together to obtain a granular coating; and pouring the granular coating into a three-roll grinder for grinding, and obtaining the para-position coating after the materials of the granular coating are fused together.
The preparation method of the double-sided composite aluminum sheet comprises the following steps.
S1: inspecting the surface of the aluminum sheet body 10 to check whether burrs or burrs exist; if the burrs or burrs exist, removing the burrs or burrs on the aluminum sheet body 10; an aluminum sheet body 10 having a flat surface is obtained.
S2: the aluminum sheet body 10 with a smooth surface is cleaned and dried, and dust, impurities and oil stains on the surface of the aluminum sheet body 10 are removed.
S3: and coating the alignment coating on the surface of the aluminum sheet body 10 in a roll coating manner.
S4: the aluminum sheet body 10 coated with the para-position coating is baked at the temperature of 200 ℃ for 120 seconds to obtain a para-position aluminum sheet body 10; the aluminum sheet body 10 is inspected.
S5: and (4) coating the prepared anti-flash coating on the aligned aluminum sheet body 10 processed in the step S4 by using a coater.
S5: the prepared paint of the inner side sub-coat 21 is applied to the aluminum sheet body 10 aligned in step S4 by using a coater.
S6: and (3) sending the para-position aluminum sheet body 10 coated with the paint of the inner side subcoating 21 into an oven for drying at the baking temperature of 200 +/-6 ℃ for 180 +/-10 seconds to obtain the aluminum sheet body 10 of the inner side subcoating 21.
S7: the aluminum sheet body 10 of the inside sub-coat layer 21 treated in step S6 is coated with the aforementioned paint of the prepared outside sub-coat layer 22 by means of a coater, to obtain the aluminum sheet body 10 coated with the paint of the outside sub-coat layer 22.
S4: sending the aluminum sheet body 10 coated with the coating of the outer side subcoating 22 into an oven for drying at the baking temperature of 200 +/-6 ℃ for 180 +/-10 seconds to obtain a double-sided composite aluminum sheet; and (5) inspecting the double-sided composite aluminum sheet.
In summary, the invention provides a double-sided composite aluminum sheet, wherein one side coated with an anti-burring resin coating is covered on a circuit board, a precise alignment resin layer faces a drill point, the drill point can contact the precise alignment layer firstly during drilling, the precise alignment layer is made of epoxy resin material and has the hardness of 2B-H, the precise alignment layer can be adhered and fixed on the position of the drill point head, the positioning effect during drilling under the drill point is achieved, and the positioning precision of the hole site of the processed circuit board is improved. Because of accurate counterpoint layer surface hardness is softer than this body surface of aluminum sheet, make the drill point bore through accurate counterpoint layer more easily, and accurate counterpoint layer can provide a buffering for drill point and aluminum sheet body, need not bump hard like current ordinary aluminum sheet is direct hard, reduce the knife face wearing and tearing of drill point, can better guarantee the sharpness of drill point knife face, reduced the drilling in-process and lead to disconnected needle because of the surface is too hard, the piece that produces when simultaneously can also making drilling in time discharges in the outside, make the inside pore wall surface of drilling after being bored by the drill point more level and more smooth, so reach and improve the interior quality of circuit board drilling of processing. When the drill point drills into the anti-burring resin coating from the aluminum sheet body, the anti-burring resin coating is harder and firmly attached to the aluminum sheet body, namely, the bonding surface of the aluminum sheet body and the anti-burring resin coating is firmly pressed, so that the generation of burrs can be effectively inhibited, and the burrs are prevented from scratching the appearance and the insulating layer of the circuit board.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A double-sided composite aluminum sheet, comprising: the aluminum sheet body is respectively provided with an anti-flash resin coating and an accurate alignment resin layer on two side surfaces of the aluminum sheet body; the thickness of the anti-flash resin coating is 10-60 mu m, and the hardness is 4-9H; the thickness of the coating of the accurate alignment resin layer is 40-140 mu m, and the hardness is 2B-H.
2. The double-sided composite aluminum sheet according to claim 1, wherein the flash-resistant resin coating is composed of a plurality of sub-coatings; and in the two adjacent subcoats, the subcoat close to the aluminum sheet body has high hardness.
3. The double-sided composite aluminum sheet according to claim 1, wherein the anti-flash resin coating is formed by baking an anti-flash paint coated on the aluminum sheet body, and the anti-flash paint comprises the following raw materials: 30-50 wt% of resin, 10-25 wt% of cross-linking agent, 0.01-50 wt% of filler, 0.1-2 wt% of defoaming agent, 0.1-2 wt% of flatting agent and the balance of solvent; the resin is at least one of epoxy resin, polyester, organic silicon resin, inorganic silicon resin and hybrid resin; the cross-linking agent is at least one of amines, anhydride curing agents, amino resin and isocyanate; the defoaming agent is an organic silicon defoaming agent or a silicon-free defoaming agent, the leveling agent is an organic silicon leveling agent or a silicon-free leveling agent, and the solvent is a solvent with a boiling point higher than 100 ℃;
accurate counterpoint resin layer is dried for the counterpoint dope layer of coating on the aluminum sheet body and is formed, the raw materials of counterpoint coating constitute: 76.1-80.1 wt% of diluent and 5.3-6.1 wt% of coating pigment; 3.5-4.2 wt% of calcium powder, 2.8-3.8 wt% of defoaming agent, 4.21-5.0 wt% of complex and 2.6-2.8 wt% of flatting agent; the diluent is ethyl lactate, and the coating pigment is epoxy resin; the calcium powder is calcium carbonate, the defoaming agent is a BYK defoaming agent, the complex is a boron trioxide complex, and the leveling agent is a BYK leveling agent.
4. The double-sided composite aluminum sheet according to claim 3, wherein the solvent is ethylene glycol ethyl ether and/or isophorone, and the filler is at least one of calcium carbonate, talc, corundum powder and silica.
5. The double-sided composite aluminum sheet according to claim 3, wherein the preparation method of the flash-proof coating comprises the following steps: adding resin and a solvent into a reaction vessel, and then adding a filler and a crosslinking agent while stirring to obtain a mixture; adding a defoaming agent and a flatting agent into the mixture to be fully and uniformly mixed, and then standing and defoaming to obtain the required anti-flash coating;
the preparation method of the para-position coating comprises the following steps: respectively placing epoxy resin, calcium powder, a boron trioxide complex, ethyl lactate, a BYK defoaming agent and a BYK flatting agent into a container, and fully stirring to fully mix the materials together to obtain a granular coating; and pouring the granular coating into a three-roll grinder for grinding, and obtaining the para-position coating after the materials of the granular coating are fused together.
6. The double-sided composite aluminum sheet according to claim 5, characterized in that the preparation method comprises the following steps:
s1: inspecting the surface of the aluminum sheet body to check whether burrs or burrs exist; if the burrs or burrs exist, removing the burrs or burrs on the aluminum sheet body; obtaining an aluminum sheet body with a smooth surface;
s2: cleaning and drying the aluminum sheet body with a smooth surface, and removing dust, impurities and oil stains on the surface of the aluminum sheet body;
s3: coating the alignment coating on the surface of the aluminum sheet body in a roll coating manner;
s4: the aluminum sheet body coated with the para-position coating is baked at the temperature of 200 ℃ for 120 seconds to obtain a para-position aluminum sheet body;
s5: coating the prepared anti-flash coating on the aligned aluminum sheet body processed in the step S4 by using a coating machine;
s6: and (3) feeding the aligned aluminum sheet body coated with the anti-flash coating into a drying oven for drying at the baking temperature of 200 +/-6 ℃ for 180 +/-10 seconds to obtain the double-sided composite aluminum sheet.
7. The double-sided aluminum clad sheet as claimed in claim 1, wherein the step S4 further comprises inspecting the aluminum clad sheet body, and the step S6 further comprises inspecting the double-sided aluminum clad sheet.
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