1. An anti-flash aluminum sheet is characterized by comprising an aluminum sheet and a modified epoxy resin layer arranged on the surface of the aluminum sheet; the modified epoxy resin layer comprises the following components in parts by weight: 70-80 parts of high molecular weight epoxy resin, 5-10 parts of setting agent and 5-10 parts of auxiliary agent.

2. The anti-flash aluminum sheet of claim 1, wherein the high molecular weight epoxy resin is a high molecular weight bisphenol a epoxy resin.

3. The anti-flash aluminum sheet of claim 1, wherein the setting agent is an organic polyamine-based compound.

4. The anti-flash aluminum sheet according to claim 1, wherein the auxiliary comprises the following components in parts by weight: 2-8 parts of flatting agent, 5-12 parts of defoaming agent and 3-10 parts of dispersing agent.

5. The anti-flash aluminum sheet according to claim 1, wherein the aluminum sheet has a thickness of 0.1-0.2 mm.

6. The aluminum flash prevention sheet of claim 1, wherein the modified epoxy resin layer has a thickness of 30-60 μ ι η.

7. The method for preparing the anti-flash aluminum sheet of any one of claims 1-6, comprising:

uniformly mixing 70-80 parts by weight of high molecular weight epoxy resin, 5-20 parts by weight of diluent, 5-10 parts by weight of setting agent and 5-10 parts by weight of auxiliary agent to prepare modified epoxy resin gloss oil;

coating the modified epoxy resin varnish on the surface of the pretreated aluminum strip;

baking the aluminum strip coated with the modified epoxy resin varnish to enable the modified epoxy resin varnish to form a modified epoxy resin layer on the surface of the aluminum strip, so as to obtain an anti-flash aluminum strip;

and rolling and cutting the cooled anti-flash aluminum strip to obtain the anti-flash aluminum sheet.

8. The method according to claim 7, wherein the step of coating the modified epoxy varnish on the surface of the aluminum strip further comprises:

and (3) pretreating the aluminum strip to obtain the pretreated aluminum strip.

9. The method according to claim 7, wherein the step of baking the aluminum strip coated with the modified epoxy varnish comprises:

and baking the aluminum strip coated with the modified epoxy resin gloss oil at 230 ℃, wherein the baking time is set to be 2 min.

10. The use of the anti-flash aluminum sheet of any one of claims 1-6, comprising: and using the anti-flash aluminum sheet for drilling of the PCB.

Background

A cover plate (short for cover plate) for drilling a Printed Circuit Board (PCB) is an auxiliary material which is placed on the surface of a PCB to be processed when the PCB is mechanically drilled so as to meet the requirements of a processing process. Because a large number of cover plates are required in the mechanical drilling processing production of the PCB, and along with the rapid development of the PCB drilling technology in recent years, the cover plate industry becomes an important component with a considerable scale in the PCB raw and auxiliary material industry.

Depending on the material, the cover plates are generally classified on the market into the following categories: phenolic paper cover plates (including phenolic paper cover plates and cold punching plates), common aluminum sheets (namely aluminum foil cover plates) and epoxy glass cloth cover plates. The phenolic paper cover plate and the cold punching plate are mainly used for drilling holes in an FPC (Flexible Printed Circuit); the common aluminum sheet is made of alloy aluminum foil and is used for drilling common and fine circuit boards; the epoxy glass fiber cloth cover plate is composed of high molecular weight epoxy resin and glass fiber cloth, and the consumption of the epoxy glass fiber cloth cover plate on the market is very small at present.

With continuous forward progress and development of society, the requirement on high precision of electronic products is higher and higher, and the high precision development of electronic products directly puts forward the high precision requirement to circuit board processing, also makes the drilling hole site precision and the downthehole quality requirement on PCB drilling higher and higher simultaneously. Although covering the location that the drill bit can effectively promote the drill bit at the PCB surface one deck aluminum sheet, can produce new problem equally, when the drill bit broke the aluminum sheet, the hole of being bored by the drill bit on the aluminum sheet very easily produced the flash, and this flash very easily scrapes colored PCB surface, influences PCB's outward appearance, and when serious, this flash can scrape the green oil insulating layer on PCB surface, influences PCB's insulating properties. And the hardness of PCB has great difference with the hardness of aluminum sheet, will directly drill to PCB after the drill bit drills through the aluminum sheet, and the drill bit directly strikes the great PCB of hardness and leads to the drilling edge breach to appear very easily and drape over one's shoulders the cutting edge, seriously influences the quality of drilling.

Disclosure of Invention

In view of the above, the present application is proposed to provide an anti-flash aluminum sheet and a preparation method and application thereof, which overcome or at least partially solve the above problems, comprising:

an anti-flash aluminum sheet comprises an aluminum sheet and a modified epoxy resin layer arranged on the surface of the aluminum sheet; the modified epoxy resin layer comprises the following components in parts by weight: 70-80 parts of high molecular weight epoxy resin, 5-10 parts of setting agent and 5-10 parts of auxiliary agent.

Preferably, the high molecular weight epoxy resin is a high molecular weight bisphenol a type epoxy resin.

Preferably, the setting agent is an organic polyamine compound.

Preferably, the auxiliary agent comprises the following components in parts by weight: 2-8 parts of flatting agent, 5-12 parts of defoaming agent and 3-10 parts of dispersing agent.

Preferably, the thickness of the aluminum sheet is 0.1-0.2 mm.

Preferably, the thickness of the modified epoxy resin layer is 30 to 60 μm.

A preparation method of the anti-flash aluminum sheet comprises the following steps:

uniformly mixing 70-80 parts by weight of high molecular weight epoxy resin, 5-20 parts by weight of diluent, 5-10 parts by weight of setting agent and 5-10 parts by weight of auxiliary agent to prepare modified epoxy resin gloss oil;

coating the modified epoxy resin varnish on the surface of the pretreated aluminum strip;

baking the aluminum strip coated with the modified epoxy resin varnish to enable the modified epoxy resin varnish to form a modified epoxy resin layer on the surface of the aluminum strip, so as to obtain an anti-flash aluminum strip;

and rolling and cutting the cooled anti-flash aluminum strip to obtain the anti-flash aluminum sheet.

Preferably, before the step of coating the modified epoxy resin varnish on the surface of the aluminum strip, the method further comprises the following steps:

and (3) pretreating the aluminum strip to obtain the pretreated aluminum strip.

Preferably, the step of baking the aluminum strip coated with the modified epoxy varnish comprises:

and baking the aluminum strip coated with the modified epoxy resin gloss oil at 230 ℃, wherein the baking time is set to be 2 min.

An application as above-mentioned prevent drape over one's shoulders aluminium sheet includes: and using the anti-flash aluminum sheet for drilling of the PCB.

The application has the following advantages:

in the embodiment of the application, the aluminum sheet is used as the base material, and the modified epoxy resin layer is arranged on the surface of the aluminum sheet; the modified epoxy resin layer comprises the following components in parts by weight: 70-80 parts of high molecular weight epoxy resin, 5-10 parts of a setting agent and 5-10 parts of an auxiliary agent, wherein when the anti-burr aluminum sheet is applied to drilling of a PCB, the modified epoxy resin layer can effectively inhibit burr generation and prevent burr from scratching the surface of the PCB.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic structural view of an anti-flash aluminum sheet according to an embodiment of the present application;

fig. 2 is a flowchart illustrating steps of a method for preparing an anti-flash aluminum sheet according to an embodiment of the present disclosure;

fig. 3 is a flowchart illustrating steps of a method for preparing an anti-flash aluminum sheet according to another embodiment of the present disclosure;

fig. 4 is a flowchart illustrating steps of an application of an anti-flash aluminum sheet according to an embodiment of the present disclosure.

The reference numbers in the drawings of the specification are as follows:

1. aluminum sheets; 2. and a modified epoxy resin layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, the anti-flash aluminum sheet provided by an embodiment of the present application is shown, including an aluminum sheet 1 and a modified epoxy resin layer 2 disposed on a surface of the aluminum sheet 1; the modified epoxy resin layer 2 comprises the following components in parts by weight: 70-80 parts of high molecular weight epoxy resin, 5-10 parts of setting agent and 5-10 parts of auxiliary agent.

The modified epoxy resin layer 2 is a reticular three-dimensional polymer formed by the cross-linking reaction of the high molecular weight epoxy resin, the setting agent and the auxiliary agent, the hardness of the modified epoxy resin layer 2 is more than 2H (Mitsubishi hardness pencil test method), and the adhesive force is more than or equal to 4B (3M adhesive tape stripping method).

In the embodiment of the present application, the aluminum sheet 1 and the modified epoxy resin layer 2 disposed on the surface of the aluminum sheet 1; the modified epoxy resin layer 2 comprises the following components in parts by weight: 70-80 parts of high molecular weight epoxy resin, 5-10 parts of a setting agent and 5-10 parts of an auxiliary agent, wherein when the anti-burr aluminum sheet is applied to drilling of a PCB, the modified epoxy resin layer 2 can effectively inhibit burr generation and prevent burr from scratching the surface of the PCB.

Next, an anti-flash aluminum sheet according to the exemplary embodiment will be further described.

In this embodiment, the high molecular weight epoxy resin is a high molecular weight bisphenol a type epoxy resin, such as at least one of E-44 epoxy resin (E-44 for short, epoxy equivalent is 44, epoxy value is 0.41-0.47mo1/100g), E-51 epoxy resin (E-51 for short, epoxy equivalent is 51, epoxy value is 0.48-0.54mo1/100g), E-55 epoxy resin (E-55 for short, epoxy equivalent is 55, epoxy value is 0.55-0.56mo1/100g), and preferably E-51 epoxy resin (specifically, epoxy resin with a trade name of south asia 128 or petrochemical E51). The bisphenol A type epoxy resin is prepared by polycondensation of bisphenol A and epichlorohydrin under the action of an alkaline catalyst, can form a cured product with excellent performance with a plurality of curing agents, catalysts and additives, basically does not generate small-molecule volatile matters during curing, and has high bonding strength, high corrosion resistance and electrical performance, and certain toughness and heat resistance.

In this embodiment, the setting agent is an organic polyamine compound, specifically one or a combination of several of phenolic amine, phenolic amide, polyamide, and modified alicyclic amine. The setting agent can react with the high molecular weight epoxy resin to form a reticular three-dimensional polymer, and the composite material aggregate is enveloped in a reticular body, so that the linear resin is changed into a tough body-shaped solid.

In the embodiment, the auxiliary agent comprises the following components in parts by weight: 2-8 parts of flatting agent, 5-12 parts of defoaming agent and 3-10 parts of dispersing agent.

As an example, the leveling agent may be a polyether-modified organosiloxane, preferably a leveling agent under the trade name BYK 354; the leveling agent can improve the leveling and gloss of a system, generate a long-wave effect and prevent shrinkage cavity. The defoaming agent can be a foam breaking polymer and a polysiloxane solution, and is preferably a defoaming agent with the trade name of BYK 530; the defoaming agent can effectively prevent bubbles from occurring in a system in the production and application processes. The dispersant may be fumed silica, preferably fumed silica under the trade name R972; the dispersant can uniformly disperse solid and liquid particles in a system, and can prevent the particles from settling and coagulating to form a stable suspension.

In the present embodiment, the aluminum sheet 1 has a thickness of 0.1 to 0.2mm, preferably 0.12mm, 0.15mm and 0.18 mm.

In the present embodiment, the thickness of the modified epoxy resin layer 2 is 30 to 60 μm, preferably 40 μm and 50 μm.

In this embodiment, the hardness of the modified epoxy resin layer 2 is greater than 2H, preferably 4 to 8H.

In this embodiment, the adhesion of the modified epoxy resin layer 2 is 4B or more, preferably 4 to 5B.

Referring to fig. 2, a method for preparing an anti-flash aluminum sheet according to any one of the embodiments above is shown, which includes:

s210, uniformly mixing 70-80 parts by weight of high molecular weight epoxy resin, 5-20 parts by weight of diluent, 5-10 parts by weight of setting agent and 5-10 parts by weight of auxiliary agent to prepare modified epoxy resin gloss oil;

s220, coating the modified epoxy resin varnish on the surface of the pretreated aluminum strip;

s230, baking the aluminum strip coated with the modified epoxy resin varnish to enable the modified epoxy resin varnish to form the modified epoxy resin layer 2 on the surface of the aluminum strip, and thus obtaining the anti-flash aluminum strip.

S240, rolling and cutting the cooled anti-flash aluminum strip to obtain the anti-flash aluminum sheet.

In an embodiment of the present application, the specific process of uniformly mixing 70 to 80 parts by weight of the high molecular weight epoxy resin, 5 to 20 parts by weight of the diluent, 5 to 10 parts by weight of the setting agent and 5 to 10 parts by weight of the additive to obtain the modified epoxy resin varnish, which is described in step S210, can be further described with reference to the following description.

And cleaning the reaction vessel. Specifically, the reaction vessel is washed with ethyl acetate or ethanol.

And adding 70-80 parts by weight of high molecular weight epoxy resin and 5-20 parts by weight of diluent into the reaction vessel. The diluent is an inactive diluent, does not participate in the reaction between the high molecular weight epoxy resin and the setting agent, and volatilizes along with the curing process of the high molecular weight epoxy resin; the diluent can reduce the viscosity of the high molecular weight epoxy resin, improve the technological performance of the high molecular weight epoxy resin and facilitate the construction of the high molecular weight epoxy resin coating.

5-10 parts by weight of the setting agent and 5-10 parts by weight of the auxiliary agent are added while stirring (the rotating speed is 300-500 r/min).

And dispersing the materials at a high speed for 15-20min (the rotating speed is 900-.

In an embodiment of the present application, a specific process of "coating the modified epoxy varnish on the surface of the pretreated aluminum strip" in step S220 can be further described with reference to the following description.

And cleaning the roller coater. Specifically, the roll coater was cleaned with a dust-free cloth.

And adjusting the roll coating speed of the roll coating machine. Specifically, the roll coating speed of the roll coating machine is adjusted to 18-30 m/min.

And coating the modified epoxy resin varnish on the surface of the pretreated aluminum strip by using the roller coating machine.

In an embodiment of the present application, the specific process of "baking the aluminum strip coated with the modified epoxy resin varnish to form the modified epoxy resin layer 2 on the surface of the aluminum strip by the modified epoxy resin varnish to obtain the flash-proof aluminum strip" in step S230 can be further described with reference to the following description.

And cleaning the baking machine. Specifically, the roaster is cleaned with a dust-free cloth.

And adjusting the baking temperature of the baking machine. Specifically, the baking temperature of the baking machine is adjusted to 150-.

And baking the aluminum strip coated with the modified epoxy resin gloss oil by using the baking machine to form the modified epoxy resin layer 2 on the surface of the aluminum strip by using the modified epoxy resin gloss oil, so as to obtain the flash-proof aluminum strip. Specifically, the surface of the aluminum strip coated with the modified epoxy resin gloss oil faces upwards, and the baking treatment is carried out at the temperature of 150-235 ℃; or; the surface of the aluminum strip coated with the modified epoxy resin varnish faces downwards, and the baking treatment is carried out at the temperature of 220-230 ℃.

In an embodiment of the present application, the specific process of "rolling and cutting the cooled flash-preventing aluminum tape to obtain the flash-preventing aluminum sheet" in step S240 may be further described with reference to the following description.

And rolling the cooled aluminum strip for preventing flash by using a rolling machine.

And cutting the anti-flash aluminum strip by using a cutting machine to obtain the anti-flash aluminum sheet.

In this embodiment, before the step of "coating the modified epoxy resin varnish on the surface of the pretreated aluminum strip", the method further includes:

and (3) pretreating the aluminum strip to obtain the pretreated aluminum strip.

In an embodiment of the present application, the specific process of "pretreating an aluminum strip to obtain the pretreated aluminum strip" may be further described with reference to the following description.

And removing burrs and burrs on the surface of the aluminum strip to obtain the aluminum strip with a smooth surface. Specifically, checking whether the surface of the aluminum strip has burrs and burrs; and if burrs or burrs exist, removing the burrs or burrs on the surface of the aluminum strip to obtain the aluminum strip with a smooth surface.

And cleaning and drying the aluminum strip with a smooth surface by adopting aluminum deacidification, and removing dust, impurities and oil stains on the surface of the aluminum strip. Specifically, according to the oil stain condition on the surface of the aluminum belt, the aluminum deacidification and clean water (tap water or well water) are prepared into a 2-6% cleaning solution; immersing the aluminum strip to be cleaned in a prepared cleaning solution for 3-5 min; and fishing out the dipped aluminum strip from the cleaning solution, fully cleaning the aluminum strip with clear water and drying. The aluminum deacidification agent is also called as an aluminum degreasing agent and an aluminum degreasing agent, is a high-efficiency aluminum treatment agent, is prepared by scientifically compounding organic acid, inorganic acid, an oxidizing agent, a corrosion inhibitor and other various degreasing aids and surfactants, and is suitable for removing oxide films on the surfaces of aluminum and aluminum alloy workpieces and cleaning various oil stains on the surfaces of the aluminum (such as mechanical oil, emulsified oil, lubricating oil, engine oil and the like).

And passivating, cleaning and drying the cleaned aluminum strip to obtain the pretreated aluminum strip. Specifically, the cleaned aluminum strip is immersed in a potassium dichromate solution (2-4g/L) at the temperature of 80-90 ℃ for 2-3 min; and fishing out the dipped aluminum strip from the potassium dichromate solution, fully cleaning the aluminum strip by using clear water and drying. The passivation treatment can improve the corrosion resistance of the aluminum strip, so that a protective film is generated on the surface of the passivated aluminum strip to slow down corrosion.

In this embodiment, the step of "performing baking treatment on the aluminum strip coated with the modified epoxy varnish" includes:

and baking the aluminum strip coated with the modified epoxy resin gloss oil at 230 ℃, wherein the baking time is set to be 2 min.

In this embodiment, after the step of rolling and cutting the cooled flash-preventing aluminum strip to obtain the flash-preventing aluminum sheet, the method further includes:

detecting and screening the anti-flash aluminum sheet, wherein the anti-flash aluminum sheet is qualified if meeting a preset requirement, and is unqualified if not meeting the preset requirement; the preset requirements include: the surface of the modified epoxy resin layer 2 has no greasy dirt, exposed bottom, bubbles or dust points larger than 0.02 mm; the surface of the aluminum sheet 1 is free of paint; the thickness of the modified epoxy resin layer 2 is 30-60 mu m, the adhesive force is greater than or equal to 4B, and the hardness is greater than 2H.

The detection method and the requirements of the anti-flash aluminum sheet are shown in the following table:

referring to fig. 3, there is shown a method for preparing an anti-flash aluminum sheet according to any one of the embodiments above, according to another embodiment of the present application, including:

s310, uniformly mixing 70-80 parts by weight of high molecular weight epoxy resin, 5-20 parts by weight of diluent, 5-10 parts by weight of setting agent and 5-10 parts by weight of auxiliary agent to prepare modified epoxy resin gloss oil;

s320, rolling and cutting the pretreated aluminum strip to obtain the aluminum sheet 1;

s330, coating the modified epoxy resin varnish on the surface of the aluminum sheet 1.

S340, baking the aluminum sheet 1 coated with the modified epoxy resin varnish to enable the modified epoxy resin varnish to form the modified epoxy resin layer 2 on the surface of the aluminum sheet 1, and thus obtaining the anti-flash aluminum sheet.

In an embodiment of the present application, the specific process of uniformly mixing 70 to 80 parts by weight of the high molecular weight epoxy resin, 5 to 20 parts by weight of the diluent, 5 to 10 parts by weight of the setting agent and 5 to 10 parts by weight of the additive to obtain the modified epoxy resin varnish, which is described in step S310, can be further described with reference to the following description.

And cleaning the reaction vessel. Specifically, the reaction vessel is washed with ethyl acetate or ethanol.

And adding 70-80 parts by weight of high molecular weight epoxy resin and 5-20 parts by weight of diluent into the reaction vessel. The diluent is an inactive diluent, does not participate in the reaction between the high molecular weight epoxy resin and the setting agent, and volatilizes along with the curing process of the high molecular weight epoxy resin; the diluent can reduce the viscosity of the high molecular weight epoxy resin, improve the technological performance of the high molecular weight epoxy resin and facilitate the construction of the high molecular weight epoxy resin coating.

5-10 parts by weight of the setting agent and 5-10 parts by weight of the auxiliary agent are added while stirring (the rotating speed is 300-500 r/min).

And dispersing the materials at a high speed for 15-20min (the rotating speed is 900-.

In an embodiment of the present application, a specific process of "rolling and cutting the pretreated aluminum strip to obtain the aluminum sheet 1" in step S320 may be further described with reference to the following description.

And rolling the pretreated aluminum strip by using a rolling machine.

And cutting the aluminum strip by using a cutting machine to obtain the aluminum sheet 1.

In an embodiment of the present application, a specific process of "coating the modified epoxy varnish on the surface of the aluminum sheet 1" in step S330 may be further described with reference to the following description.

And cleaning the roller coater. Specifically, the roll coater was cleaned with a dust-free cloth.

And adjusting the roll coating speed of the roll coating machine. Specifically, the roll coating speed of the roll coating machine is adjusted to 18-30 m/min.

And coating the modified epoxy resin varnish on the surface of the aluminum sheet 1 by adopting the roller coating machine.

In an embodiment of the present application, the specific process of "baking the aluminum sheet 1 coated with the modified epoxy resin varnish to form the modified epoxy resin layer 2 on the surface of the aluminum sheet 1 to obtain the flash-proof aluminum sheet" in step S340 may be further described with reference to the following description.

And cleaning the baking machine. Specifically, the roaster is cleaned with a dust-free cloth.

And adjusting the baking temperature of the baking machine. Specifically, the baking temperature of the baking machine is adjusted to 150-.

And baking the aluminum sheet 1 coated with the modified epoxy resin varnish by using the baking machine to form the modified epoxy resin layer 2 on the surface of the aluminum sheet 1 by using the modified epoxy resin varnish, so as to obtain the anti-flash aluminum sheet. Specifically, the surface of the aluminum sheet 1 coated with the modified epoxy resin varnish faces upwards, and the baking treatment is carried out at the temperature of 150-235 ℃; or; the surface of the aluminum sheet 1 coated with the modified epoxy resin varnish faces downwards, and the baking treatment is carried out at the temperature of 220-230 ℃.

In this embodiment, before the step of rolling and cutting the pretreated aluminum strip to obtain the aluminum sheet 1, the method further includes:

and (3) pretreating the aluminum strip to obtain the pretreated aluminum strip.

In an embodiment of the present application, the specific process of "pretreating an aluminum strip to obtain the pretreated aluminum strip" may be further described with reference to the following description.

And removing burrs and burrs on the surface of the aluminum strip to obtain the aluminum strip with a smooth surface. Specifically, checking whether the surface of the aluminum strip has burrs and burrs; if burrs or burrs exist, removing the burrs or burrs on the surface of the aluminum strip to obtain the aluminum strip with a smooth surface;

and cleaning and drying the aluminum strip with a smooth surface by adopting aluminum deacidification, and removing dust, impurities and oil stains on the surface of the aluminum strip. Specifically, according to the amount of oil stain on the surface of the aluminum strip, the aluminum deacidification and clean water (tap water or well water) are prepared into a 2-6% cleaning solution; immersing the aluminum strip to be cleaned in a prepared cleaning solution for 3-5 min; and fishing out the dipped aluminum strip from the cleaning solution, fully cleaning the aluminum strip with clear water and drying. The aluminum deacidification agent is also called as an aluminum degreasing agent and an aluminum degreasing agent, is a high-efficiency aluminum treatment agent, is prepared by scientifically compounding organic acid, inorganic acid, an oxidizing agent, a corrosion inhibitor and other various degreasing aids and surfactants, and is suitable for removing oxide films on the surfaces of aluminum and aluminum alloy workpieces and cleaning various oil stains on the surfaces of the aluminum (such as mechanical oil, emulsified oil, lubricating oil, engine oil and the like).

And passivating, cleaning and drying the cleaned aluminum strip to obtain the pretreated aluminum strip. Specifically, the cleaned aluminum strip is immersed in a potassium dichromate solution (2-4g/L) at the temperature of 80-90 ℃ for 2-3 min; and fishing out the dipped aluminum strip from the potassium dichromate solution, fully cleaning the aluminum strip by using clear water and drying. The passivation treatment can improve the corrosion resistance of the aluminum strip, so that a protective film is generated on the surface of the passivated aluminum strip to slow down corrosion.

In this embodiment, the step of "performing the baking treatment on the aluminum sheet 1 coated with the modified epoxy varnish" includes:

and baking the aluminum sheet 1 coated with the modified epoxy resin varnish at 230 ℃ for 2 min.

In this embodiment, after the step of baking the aluminum sheet 1 coated with the modified epoxy resin varnish to form the modified epoxy resin layer 2 on the surface of the aluminum sheet 1 by the modified epoxy resin varnish to obtain the flash-proof aluminum sheet, the method further includes:

detecting and screening the anti-flash aluminum sheet, wherein the anti-flash aluminum sheet is qualified if meeting a preset requirement, and is unqualified if not meeting the preset requirement; the preset requirements include: the surface of the modified epoxy resin layer 2 has no greasy dirt, exposed bottom, bubbles or dust points larger than 0.02 mm; the surface of the aluminum sheet 1 is free of paint; the thickness of the modified epoxy resin layer 2 is 30-60 mu m, the adhesive force is greater than or equal to 4B, and the hardness is greater than 2H.

The detection method and the requirements of the anti-flash aluminum sheet are shown in the following table:

referring to fig. 4, in an embodiment of the present application, there is provided an application of the anti-flash aluminum sheet according to any one of the above embodiments, including:

s410, using the anti-flash aluminum sheet for drilling of the PCB.

In an embodiment of the present application, the specific process of "using the anti-flash aluminum sheet for drilling holes in PCB" in step S410 can be further described with reference to the following description.

The base plate, the PCB to be drilled and the anti-flash aluminum sheet are sequentially placed on the machine from bottom to top, so that the modified epoxy resin layer 2 faces the PCB, and the aluminum sheet 1 faces the drill bit. Specifically, the backing plate can be a phenolic paper backing plate, and has the characteristics of high flatness, high temperature resistance, deformation resistance and the like; the drill bit is a UC type drill bit.

And controlling the drill to drill downwards from the upper part of the anti-flash aluminum sheet. Specifically, the drill is controlled to drill downwards from the upper part of the anti-flash aluminum sheet at the rotating speed of 100KRMP, the feed speed of 2.7m/min and the withdrawal speed of 22.05 m/min.

And after the drill bit sequentially drills through the anti-flash aluminum sheet and the PCB and contacts with the base plate, controlling the drill bit to stop drilling.

While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The detailed description is given to the anti-flash aluminum sheet and the preparation method and the application thereof, specific examples are applied in the detailed description to explain the principle and the implementation mode of the aluminum sheet, and the description of the examples is only used for helping to understand the method and the core idea of the aluminum sheet; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.