阅读说明：本技术 一种复合涂层铝片及其制备方法和应用 (Composite coating aluminum sheet and preparation method and application thereof ) 是由 朱三云 杨国辉 朱大胜 宋银伟 于 2021-07-30 设计创作，主要内容包括：本申请提供了一种复合涂层铝片及其制备方法和应用。所述复合涂层铝片包括铝片和相对设置在所述铝片两侧的热固性树脂层和光固化树脂层；所述热固性树脂层由酚醛树脂材料制成；所述光固化树脂层按重量份数计包括以下组分：预聚物30-70份、单体10-30份、光引发剂3-6份、助剂2-10份。当将所述复合涂层铝片应用于PCB的钻孔时,所述热固性树脂层可以利用粘结性能将所述钻头尖端粘住,使得所述钻头在预设位置上旋转,避免所述钻头入钻瞬间偏离预设位置而引起打滑,有利于提高钻孔的定位精度。此外,所述光固化树脂层可以有效抑制披锋的产生,避免披锋刮花所述PCB表面。(The application provides a composite coating aluminum sheet and a preparation method and application thereof. The composite coating aluminum sheet comprises an aluminum sheet, and a thermosetting resin layer and a light-cured resin layer which are oppositely arranged on two sides of the aluminum sheet; the thermosetting resin layer is made of phenolic resin material; the light-cured resin layer comprises the following components in parts by weight: 30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent. When will the composite coating aluminum sheet is applied to PCB's drilling, the thermosetting resin layer can utilize the adhesive property will the drill bit pointed end glues for the drill bit is rotatory on predetermineeing the position, avoids the drill bit gets into to bore skew predetermineeing the position in the twinkling of an eye and arouses to skid, is favorable to improving the positioning accuracy of drilling. In addition, the light-cured resin layer can effectively inhibit the generation of burrs, and the burrs are prevented from scratching the surface of the PCB.)

1. The composite coating aluminum sheet is characterized by comprising an aluminum sheet, and a thermosetting resin layer and a light-cured resin layer which are oppositely arranged on two sides of the aluminum sheet; the thermosetting resin layer is made of phenolic resin material; the light-cured resin layer comprises the following components in parts by weight: 30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent.

2. The composite coated aluminum sheet of claim 1 wherein the prepolymer is one or more combinations of unsaturated polyester, epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate, pure acrylic, silicone oligomer.

3. The composite coated aluminum sheet of claim 1, wherein the monomer is one or more of a bifunctional monomer and a polyfunctional monomer.

4. The composite coated aluminum sheet of claim 1, wherein the photoinitiator is one or more of a cleavage type radical photoinitiator, a hydrogen abstraction type radical photoinitiator, a cationic photoinitiator, and a macro-molecular photoinitiator.

5. The composite coated aluminum sheet of claim 1, wherein the additive comprises the following components in parts by weight: 0.5-2.0 parts of stabilizer, 0.2-0.8 part of plasticizer, 0.2-0.8 part of flatting agent and 0.3-0.8 part of defoaming agent.

6. The composite coated aluminum sheet of claim 1 further comprising a tack-free adhesive layer disposed between the aluminum sheet and the thermosetting resin layer.

7. The composite coated aluminum sheet according to claim 1, wherein the aluminum sheet has a thickness of 0.1-0.2 mm; the thickness of the light-cured resin layer is 0.03-0.05 mm; the thickness of the thermosetting resin layer is 0.03-0.05 mm.

8. A method for preparing a composite coated aluminum sheet as claimed in any one of claims 1 to 7, comprising:

extruding the aluminum sheet and the thermosetting resin layer into an integrally formed plate body;

uniformly mixing 30-70 parts by weight of prepolymer, 10-30 parts by weight of monomer, 3-6 parts by weight of photoinitiator and 2-10 parts by weight of auxiliary agent to prepare the photocuring resin coating;

coating the light-cured resin paint on the surface of the aluminum sheet far away from the thermosetting resin layer;

and carrying out ultraviolet irradiation on the aluminum sheet coated with the light-cured resin coating to enable the light-cured resin coating to form the light-cured resin layer on the surface of the aluminum sheet, so as to prepare the composite coating aluminum sheet.

9. The method for producing according to claim 8, wherein the step of extruding the aluminum sheet and the thermosetting resin layer into an integrally molded plate body comprises:

placing the thermosetting resin layer on the surface of the aluminum sheet, and extruding the aluminum sheet and the thermosetting resin layer into an integrally formed plate body in a hot press forming mode;

or;

sequentially placing an adhesive layer and the thermosetting resin layer on the surface of the aluminum sheet, and extruding the aluminum sheet and the thermosetting resin layer into an integrally formed plate body in a cold press molding mode.

10. Use of a composite coated aluminium sheet according to any one of claims 1 to 7, comprising: and using the composite coating aluminum sheet for drilling of the PCB.

Technical Field

The application relates to the technical field of PCB drilling, in particular to a composite coating aluminum sheet and a preparation method and application thereof.

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 epoxy resin and glass fiber cloth, and the amount 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 PCB with a layer of aluminum sheet can effectively improve the positioning of the drill bit, it also causes new problems: (1) the surface of the aluminum sheet is smooth, so that the drill bit is easy to slip instantly when drilling, the distance deviation between the processed drilling hole site and the pre-designed hole site is large, the accuracy of the processed drilling hole site is low, and the drill bit is easy to break when drilling or back drilling because of the instant slipping process when drilling; (2) when the aluminum sheet was bored to the drill bit, the hole of being bored by the drill bit on the aluminum sheet very easily produces and drapes over one's shoulders the cutting edge of a knife or a sword, this drapes over one's edge of a knife or a sword very easily scrapes the PCB surface, influence PCB's insulating properties, and PCB's hardness has great difference with the hardness of aluminum sheet, will directly drill to PCB after the drill bit bored the aluminum sheet, the drill bit is direct to strike the great PCB of hardness and leads to the drilling edge breach to appear very easily and drapes over one's edge of a knife or a sword, seriously influence the quality of drilling.

Disclosure of Invention

In view of the problems, the present application is proposed to provide a composite coated aluminum sheet and a method of making and using the same, which overcomes or at least partially solves the problems, comprising:

a composite coating aluminum sheet comprises an aluminum sheet, and a thermosetting resin layer and a light-cured resin layer which are oppositely arranged on two sides of the aluminum sheet; the thermosetting resin layer is made of phenolic resin material; the light-cured resin layer comprises the following components in parts by weight: 30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent.

Preferably, the prepolymer is one or more of unsaturated polyester, epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate, pure acrylic resin and organic silicon oligomer.

Preferably, the monomer is one or more of a bifunctional monomer and a multifunctional monomer.

Preferably, the photoinitiator is one or more of a cracking type free radical photoinitiator, a hydrogen abstraction type free radical photoinitiator, a cationic photoinitiator and a macromolecular photoinitiator.

Preferably, the auxiliary agent comprises the following components in parts by weight: 0.5-2.0 parts of stabilizer, 0.2-0.8 part of plasticizer, 0.2-0.8 part of flatting agent and 0.3-0.8 part of defoaming agent.

Preferably, a non-drying adhesive layer is further included, the non-drying adhesive layer being disposed between the aluminum sheet and the thermosetting resin layer.

Preferably, the thickness of the aluminum sheet is 0.1-0.2 mm; the thickness of the light-cured resin layer is 0.03-0.05 mm; the thickness of the thermosetting resin layer is 0.03-0.05 mm.

A preparation method of the composite coating aluminum sheet comprises the following steps:

extruding the aluminum sheet and the thermosetting resin layer into an integrally formed plate body;

uniformly mixing 30-70 parts by weight of prepolymer, 10-30 parts by weight of monomer, 3-6 parts by weight of photoinitiator and 2-10 parts by weight of auxiliary agent to prepare the photocuring resin coating;

coating the light-cured resin paint on the surface of the aluminum sheet far away from the thermosetting resin layer;

and carrying out ultraviolet irradiation on the aluminum sheet coated with the light-cured resin coating to enable the light-cured resin coating to form the light-cured resin layer on the surface of the aluminum sheet, so as to prepare the composite coating aluminum sheet.

Preferably, the step of extruding the aluminum sheet and the thermosetting resin layer into an integrally molded plate body includes:

placing the thermosetting resin layer on the surface of the aluminum sheet, and extruding the aluminum sheet and the thermosetting resin layer into an integrally formed plate body in a hot press forming mode;

or;

sequentially placing an adhesive layer and the thermosetting resin layer on the surface of the aluminum sheet, and extruding the aluminum sheet and the thermosetting resin layer into an integrally formed plate body in a cold press molding mode.

Use of a composite coated aluminium sheet as described above comprising: and using the composite coating aluminum sheet for drilling of the PCB.

The application has the following advantages:

in the embodiment of the application, the light-cured resin layer is formed by an aluminum sheet and a thermosetting resin layer and a light-cured resin layer which are oppositely arranged on two sides of the aluminum sheet; the thermosetting resin layer is made of phenolic resin material; the light-cured resin layer comprises the following components in parts by weight: 30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent, wherein when the composite coating aluminum sheet is applied to drilling of a PCB (printed Circuit Board), the tip of the drill bit can be adhered by the thermosetting resin layer by utilizing the adhesive property, so that the drill bit rotates at a preset position, the drill bit is prevented from deviating from the preset position at the moment of drilling to cause slipping, and the positioning accuracy of drilling is improved; in addition, the thermosetting resin layer can enable drill cuttings generated by drilling to be instantaneously ablated by utilizing the instantaneous ablation performance, so that the drill cuttings are prevented from remaining in the hole wall or around the drilling hole, and the surface quality of the hole wall of the drilling hole is improved; in addition, the light-cured resin layer can effectively inhibit the generation of burrs, and the burrs are prevented 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 diagram of a composite coated aluminum sheet provided by an embodiment of the present application;

FIG. 2 is a flow chart of the steps of a method for preparing a composite coated aluminum sheet according to an embodiment of the present application;

fig. 3 is a flowchart illustrating steps of an application of a composite coated aluminum sheet according to an embodiment of the present application.

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

1. aluminum sheets; 2. a thermosetting resin layer; 3. and a light-curing 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, a composite-coated aluminum sheet provided by an embodiment of the present application is shown, including an aluminum sheet 1, and a thermosetting resin layer 2 and a light-curing resin layer 3 oppositely disposed on both sides of the aluminum sheet 1; the thermosetting resin layer 2 is made of a phenolic resin material; the light-cured resin layer 3 comprises the following components in parts by weight: 30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent.

The thermosetting resin layer 2 is made of a phenolic resin material which is a composite material made of a mixture of 40% of first-order thermosetting phenolic resin and 60% of diphenol propane type epoxy resin, and has excellent adhesion and instant ablation performance. The light-cured resin layer 3 is a reticular three-dimensional polymer formed by the cross-linking reaction of the prepolymer, the monomer, the photoinitiator and the auxiliary agent under the catalysis of ultraviolet light, the hardness of the light-cured resin layer 3 is less than or equal to 1HB (Mitsubishi hardness pencil test method), and the adhesive force is greater than or equal to 5B (3M adhesive tape stripping method).

In the embodiment of the present application, the light-cured resin layer 3 is formed by an aluminum sheet 1 and a thermosetting resin layer 2 and a light-cured resin layer 3 oppositely arranged on both sides of the aluminum sheet 1; the thermosetting resin layer 2 is made of a phenolic resin material; the light-cured resin layer 3 comprises the following components in parts by weight: 30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent, wherein when the composite coating aluminum sheet is applied to drilling of a PCB (printed Circuit Board), the tip of the drill bit can be adhered by the thermosetting resin layer 2 by utilizing the adhesive property, so that the drill bit rotates at a preset position, the drill bit is prevented from deviating from the preset position at the moment of drilling to cause slippage, and the positioning accuracy of drilling is improved; in addition, the thermosetting resin layer 2 can instantly ablate the drill cuttings generated by drilling by using the instant ablation performance, so that the drill cuttings are prevented from remaining in the hole wall or around the hole, and the surface quality of the hole wall of the drilled hole is improved; in addition, the light-cured resin layer 3 can effectively inhibit the generation of burrs, and the burrs are prevented from scratching the surface of the PCB.

Next, a composite-coated aluminum sheet in the present exemplary embodiment will be further described.

In this embodiment, the prepolymer is one or a combination of more of unsaturated polyester, epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate, pure acrylic resin, and silicone oligomer. Preferably, the prepolymer is polyurethane acrylate or polyester acrylate, and has excellent wear resistance and adhesion capability.

In this embodiment, the monomer is one or a combination of two or more of a bifunctional monomer and a polyfunctional monomer. Specifically, the monomer may be ethylene glycol diacrylate, propylene glycol diacrylate, other glycol diacrylates, trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, diquaternary tetraalcohol hexaacrylate, or the like.

In this embodiment, the photoinitiator is one or a combination of more of a cleavage type radical photoinitiator, a hydrogen abstraction type radical photoinitiator, a cationic photoinitiator, and a macromolecular photoinitiator. Preferably, the photoinitiator is a photoinitiator having strong absorption in a wavelength range not shorter than 350nm, such as 2-benzyl-2- (dimethylamino) -1- [4- (4-morpholino) phenyl ] -1-butanone), 2-methyl-1- [4- (methylthio) phenyl ] -2- (4-morpholino) -1-propanone, phenylbis (2,4, 6-trimethylbenzoyl) -phosphine oxide, TPO (diphenyl (2,4, 6-trimethylbenzoyl) phosphine oxide, and the like.

In the embodiment, the auxiliary agent comprises the following components in parts by weight: 0.5-2.0 parts of stabilizer and 0.2-0.8 part of plasticizer. The stabilizer can improve the storage stability of the light-cured resin coating; the plasticizer may improve the processability of the prepolymer. Preferably, the auxiliary agent further comprises the following components in parts by weight: 0.2-0.8 part of leveling agent and 0.3-0.8 part of defoaming agent. The components of the defoaming agent and the leveling agent can be selected according to actual requirements.

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. Specifically, the aluminum sheet 1 was of the type "1100-H18" and had a purity of 99.7%.

In the present embodiment, the thickness of the light-curing resin layer 3 is 0.03 to 0.05mm, preferably 0.04 mm.

In the present embodiment, the thickness of the thermosetting resin layer 2 is 0.03 to 0.05mm, preferably 0.04 mm.

In the present embodiment, the hardness of the photocurable resin layer 3 is 1HB or less, preferably 1 HB.

In this embodiment, the adhesion of the photocurable resin layer 3 is 5B or more, preferably 5B.

Referring to fig. 2, there is shown a method for preparing a composite coated aluminum sheet according to any one of the above embodiments, including:

s210, extruding the aluminum sheet 1 and the thermosetting resin layer 2 into an integrally formed plate body;

s220, uniformly mixing 30-70 parts by weight of prepolymer, 10-30 parts by weight of monomer, 3-6 parts by weight of photoinitiator and 2-10 parts by weight of auxiliary agent to prepare the photocuring resin coating;

s230, coating the light-cured resin paint on the surface, far away from the thermosetting resin layer 2, of the aluminum sheet 1;

s240, irradiating the aluminum sheet 1 coated with the light-cured resin paint with ultraviolet light to enable the light-cured resin paint to form the light-cured resin layer 3 on the surface of the aluminum sheet 1, and thus obtaining the composite coating aluminum sheet.

In an embodiment of the present application, a specific process of "extruding the aluminum sheet 1 and the thermosetting resin layer 2 into an integrally molded plate body" in step S210 may be further described in conjunction with the following description.

Placing the thermosetting resin layer 2 on the surface of the aluminum sheet 1, and extruding the aluminum sheet 1 and the thermosetting resin layer 2 into an integrally formed plate body in a hot press forming mode. In the process, the aluminum sheet 1 and the thermosetting resin layer 2 are bonded and fixed together by utilizing the instant ablation performance of the thermosetting resin layer 2, so as to form the integrally formed plate body.

Or;

the self-adhesive layer and the thermosetting resin layer 2 are sequentially placed on the surface of the aluminum sheet 1, and the aluminum sheet 1 and the thermosetting resin layer 2 are extruded into an integrally formed plate body in a cold press molding mode. In the process, the aluminum sheet 1 and the thermosetting resin layer 2 are bonded and fixed together by the non-drying adhesive layer to form the integrally formed plate body.

In an embodiment of the present application, the specific process of "uniformly mixing 30 to 70 parts by weight of the prepolymer, 10 to 30 parts by weight of the monomer, 3 to 6 parts by weight of the photoinitiator, and 2 to 10 parts by weight of the auxiliary agent to obtain the photocurable resin coating" in step S220 can be further described with reference to the following description.

30-70 parts of prepolymer, 10-30 parts of monomer, 3-6 parts of photoinitiator and 2-10 parts of auxiliary agent are put into a reaction vessel and dispersed for 5min at constant speed.

And carrying out ultrasonic treatment on the materials under the condition of keeping out of the sun for 8 hours to obtain the photocuring resin coating.

And storing the light-cured resin coating inside a light-resistant container.

In an embodiment of the present application, a specific process of "applying the photocurable resin paint on the surface of the aluminum sheet 1 away from the thermosetting resin layer 2" in step S230 may be further described with reference to the following description.

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 light-cured resin paint on the surface, far away from the thermosetting resin layer 2, of the aluminum sheet 1 by using the roller coating machine.

In an embodiment of the present application, the specific process of "irradiating the aluminum sheet 1 coated with the light-cured resin paint with ultraviolet light to form the light-cured resin layer 3 on the surface of the aluminum sheet 1 by the light-cured resin paint to obtain the composite coated aluminum sheet" in step S240 can be further described with reference to the following description.

And (3) carrying out ultraviolet irradiation on the aluminum sheet 1 coated with the light-cured resin coating by a light curing machine, wherein the wavelength of a light source used by the light curing machine is 350-600nm, and preferably 365-420 nm. Specifically, the light curing machine is provided with 1-3 ultraviolet light tubes of 3-20kw and 0-3 metal halogen tubes of 3-20kw, and the transmission speed of the light curing machine is 1-200 m/min.

Referring to fig. 3, in an embodiment of the present application, there is provided a use of the composite coated aluminum sheet according to any one of the embodiments, including:

s310, using the composite coating aluminum sheet for drilling of the PCB.

In an embodiment of the present application, a specific process of "using the composite-coated aluminum sheet for drilling holes in PCB" in step S310 may be further described in conjunction with the following description.

The base plate, the PCB to be drilled and the composite coating aluminum sheet are sequentially placed on the machine table from bottom to top, so that the light-cured resin layer 3 faces the PCB, and the thermosetting resin layer 2 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 composite coating aluminum sheet. Specifically, the drill is controlled to drill downwards from the upper part of the composite coating 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 composite coating aluminum sheet and the PCB and contacts 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 composite coating aluminum sheet provided by the application and the preparation method and application thereof are introduced in detail, the principle and the implementation mode of the application are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the application; 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.