A double-sided coated aluminum backdrilling backplate and method of manufacture

Abstract

The application relates to the technical field of PCB drilling backplate, and discloses an aluminum sheet back drilling backplate coated with UV resin coating on two surfaces and a processing method, the aluminum sheet back drilling backplate comprises a base material aluminum sheet and UV resin coatings coated on the upper surface and the lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials in parts by weight: 40-50 parts of acrylic resin, 40-50 parts of polyurethane acrylic resin, 50-70 parts of active monomer, 7-12 parts of photoinitiator, 3.5-5.5 parts of enamine modified graphene oxide, 0.1-0.3 parts of leveling agent, 1-3 parts of defoaming agent and 0.1-0.5 parts of dispersing agent. The coating coated on two surfaces can protect the aluminum sheet back drilling backplate from corrosion and oxidation, thereby prolonging the service life of the aluminum sheet back drilling backplate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of PCB drilling backplate, in particular to an aluminum sheet back drilling backplate coated with UV resin on two sides and a processing method. BACKGROUND

[0002] The backplate is a material placed under the to-be-processed board during mechanical drilling of a printed circuit board (PCB) to meet the requirements of the processing technology. The use of the backplate can effectively reduce burrs at the drilling holes of the base material, protect the drilling machine table during drilling of the through PCB, reduce the temperature of the drill bit, reduce wear of the drill bit, clean part of the drill dirt on the drill bit, and improve the drilling accuracy to a certain extent.

[0003] The aluminum sheet back drilling backplate is a commonly used backplate for PCB drilling processing. If the aluminum sheet back drilling backplate has corrosion marks, the surface hardness and smoothness of the aluminum sheet back drilling backplate will be greatly discounted, which will affect the flatness of the aluminum sheet back drilling backplate during drilling, thereby increasing burrs at the drilling holes of the base material and further affecting the drilling chip removal and drilling accuracy of the PCB. The application coats the aluminum sheet back drilling backplate on two sides with a coating layer to protect the corrosion resistance and oxidation resistance of the aluminum sheet back drilling backplate, thereby prolonging the service life of the aluminum sheet back drilling backplate. SUMMARY

[0004] The application aims to provide an aluminum sheet back drilling backplate coated with UV resin on two sides and a processing method.

[0005] The application can achieve the above-mentioned purpose through the following technical scheme.

[0006] An aluminum sheet back drilling backplate coated with UV resin on two sides, comprising a base material aluminum sheet and a UV resin coating layer coated on the upper surface and the lower surface of the aluminum sheet, wherein the UV resin coating layer comprises the following raw materials in parts by weight:

[0007] 40-50 parts of acrylic resin, 40-50 parts of polyurethane acrylic resin, 50-70 parts of active monomer, 7-12 parts of photoinitiator, 3.5-5.5 parts of enamine modified graphene oxide, 0.1-0.3 parts of leveling agent, 1-3 parts of defoaming agent, and 0.1-0.5 parts of dispersing agent.

[0008] Further, the active monomer is one or a combination of pentaerythritol tetraacrylate, propoxylated trimethylolpropane triacrylate, and ethoxylated trimethylolpropane triacrylate.

[0009] Further, the photoinitiator is one of photoinitiator TPO, photoinitiator 819, and photoinitiator 184.

[0010] Further, the preparation method of the enamine modified graphene oxide is as follows:

[0011] S1, acylation of graphene oxide

[0012] Weigh 1.0-1.3g graphene oxide and 100-120ml N,N dimethylformamide into the reaction bottle containing reflux device, open the stirring, slowly add 3.5-4.0g SOCl2, after the addition is completed, open the heating, incubation stirring reaction 40-50h, after the reaction is completed, natural cooling to room temperature, filtration, using anhydrous ether washing, drying, acylated graphene oxide is obtained;

[0013] S2, preparation of enamine modified graphene oxide

[0014] Measure 400-450ml solvent tetrahydrofuran and acylated graphene oxide prepared in S1 into the reaction bottle, then add 0.7-0.85g undec-10-ene-1-amine, open the stirring and heating, incubation reaction 48-72h, after the reaction is completed, natural cooling to room temperature, filtration, using anhydrous ether washing, drying, enamine modified graphene oxide is obtained.

[0015] Graphene material has excellent hydrophobic, oleophobic performance, high specific surface area, high aspect ratio, chemical inertness and impermeability, applied in coating, can improve the impact resistance and wear resistance of coating, its two-dimensional layered structure also has certain barrier effect on corrosion medium, but the dispersibility of graphene in coating is poor, easy to aggregate, leading to the coating is not smooth enough, the performance is unstable, the graphene oxide has a large number of oxygen-containing functional groups, grafting some small molecule compounds, the modified graphene oxide has good dispersibility in coating, can effectively prevent aggregation. The part of carboxyl in the graphene oxide can react with thionyl chloride to obtain acylated graphene oxide, the acylated graphene oxide reacts with undec-10-ene-1-amine to obtain enamine modified graphene oxide, the enamine modified graphene oxide contains olefin, which can react with the resin matrix acrylic resin, polyurethane acrylic resin and active monomer in the coating under the action of photoinitiator, further solve the problem of easy aggregation of graphene, firmly solidify the graphene in the coating, and the covalent bond form grafts undec-10-ene-1-amine, the fatty carbon chain formed after curing further plays a role in blocking corrosion medium, greatly enhances the corrosion resistance of the coating.

[0016] Further, the temperature of incubation in step S1 is 65-75℃.

[0017] Further, the temperature of incubation in step S2 is 65-70℃.

[0018] Further, the leveling agent is polybutyl acrylate or polypropyl acrylate.

[0019] Further, the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether or polydimethylsiloxane.

[0020] Further, the dispersing agent is calcium stearate or zinc stearate.

[0021] A processing method of an aluminum sheet back drill pad coated with UV resin coating on both sides, comprising the following steps:

[0022] First step: add the formula amount of acrylic resin, polyurethane acrylic resin, active monomer and enamine modified graphene oxide into the stirred tank, after uniform stirring, add the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent, continue to stir for 1-2h, mix uniformly, and then UV resin coating is obtained;

[0023] Second step: use a roller coater to coat a layer of the coating prepared in the first step on one side of the substrate aluminum sheet, smooth, use a UV lamp to irradiate and cure, after curing, use the same method to coat the other side of the substrate aluminum sheet and perform curing, and the aluminum sheet back drill pad coated with UV resin coating on both sides is obtained; the thickness of the coating is 300-350um.

[0024] The beneficial effects of the present application are:

[0025] The aluminum sheet back drill pad coated with UV resin coating on both sides provided by the present application takes aluminum sheet as the substrate, and the UV resin coating is coated on the upper surface and the lower surface of the aluminum sheet, the UV resin coating takes acrylic resin, polyurethane acrylic resin and active monomer as the main body, and further polymerizes and cures with the enamine modified graphene oxide in the formula under the action of the photoinitiator, thereby further solving the problem of easy agglomeration of graphene, firmly curing the graphene in the coating, and covalently bonding the undecan-10-ene-1-amine in the form of grafting, the fatty carbon chain formed after curing further plays a role in blocking corrosion medium, greatly enhances the corrosion resistance of the coating, and thereby prolongs the service life of the aluminum sheet back drill pad.

[0026] Of course, implementing any product of the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is an infrared contrast diagram of oxidized graphite and enamine modified graphene oxide, wherein a is the infrared spectrum of oxidized graphite, and b is the infrared spectrum of enamine modified graphene oxide.

[0029] Figure 2 These are TEM comparison images of graphene oxide and enamine-modified graphene oxide, where: A is the TEM image of graphene oxide; B is the TEM image of enamine-modified graphene oxide.

[0030] Figure 3 The attached figures show the water contact angles of Examples 1-3 and Comparative Examples 1-3. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the following embodiments, the preparation method of the enamine-modified graphene oxide is as follows:

[0033] S1, Acylation of graphene oxide

[0034] Weigh 1.0 g of graphene oxide and 100 ml of N,N-dimethylformamide and add them to a reaction flask containing a reflux device. Start stirring and slowly add 3.8 g of SOCl2. After the addition is complete, turn on the heat and set the temperature to 70 °C. Keep the temperature and stir for 48 h. After the reaction is complete, let it cool naturally to room temperature, filter, wash with anhydrous diethyl ether, and dry to obtain acylated graphene oxide.

[0035] S2, Preparation of enamine-modified graphene oxide

[0036] 400 ml of tetrahydrofuran solvent and the acylated graphene oxide prepared by S1 were added to a reaction flask, followed by 0.8 g of undec-10-en-1-amine. Stirring and heating were started, and the temperature was set to 65 °C. The reaction was maintained at this temperature for 72 h. After the reaction was completed, the mixture was allowed to cool naturally to room temperature, filtered, washed with anhydrous diethyl ether, and dried to obtain enamine-modified graphene oxide. Figure 1 As shown, a is the infrared spectrum of graphene oxide, and b is the infrared spectrum of enamine-modified graphene oxide.

[0037] Before the reaction, the hydroxyl absorption peak at 3430 cm⁻¹ in Figure a is the peak of hydroxyl groups in graphite oxide. After the reaction, the peak at 3226 cm⁻¹ in Figure b is the stretching vibration peak of NH in amide. Before the reaction, the stretching vibration peak of carboxyl groups at 1645 cm⁻¹ in Figure a is the peak of carboxyl groups at 1642 cm⁻¹ and the stretching vibration peak of carbonyl groups in amide at 1630 cm⁻¹ in Figure b, respectively (some carboxyl groups participate in the reaction). The characteristic absorption peak of NH is at 1478 cm⁻¹.

[0038] Figure 2 In the figure, A is a TEM image of graphene oxide; graphene oxide is transparent flake with corrugated structure, B is a TEM image of enamine modified graphene oxide; enamine modified graphene oxide has obvious black fog, because graphene oxide edge is grafted with undec-10-ene-1-amine.

[0039] Example 1

[0040] A double-sided coated aluminum sheet back drill pad with UV resin coating, comprising a substrate aluminum sheet and a UV resin coating coated on the upper surface and lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials by weight:

[0041] 40 parts of acrylic resin, 40 parts of polyurethane acrylic resin, 50 parts of active monomer, 8 parts of photoinitiator, 3.5 parts of enamine modified graphene oxide, leveling agent 0.1 part, defoaming agent 1 part, dispersing agent 0.3 part;

[0042] The active monomer is pentaerythritol tetraacrylate;

[0043] The photoinitiator is photoinitiator TPO;

[0044] The leveling agent is polybutyl acrylate;

[0045] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0046] The dispersing agent is calcium stearate;

[0047] The processing method of the double-sided coated aluminum sheet back drill pad with UV resin coating, comprising the following steps:

[0048] First step: add the formula amount of acrylic resin, polyurethane acrylic resin, active monomer and enamine modified graphene oxide into the stirred tank, after uniform stirring, add the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent, continue to stir for 2h, mix uniformly, get UV resin coating;

[0049] Second step: use a roller coater to coat a layer of coating prepared in the first step on one side of the substrate aluminum sheet, smooth, use UV lamp to irradiate and cure, after curing, use the same method to coat the other side of the substrate aluminum sheet and cure, the thickness of the coating is 300um.

[0050] Example 2

[0051] A double-sided coated aluminum sheet back drill pad with UV resin coating, comprising a substrate aluminum sheet and a UV resin coating coated on the upper surface and lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials by weight:

[0052] 45 parts of acrylic resin, 46 parts of polyurethane acrylic resin, 55 parts of active monomer, 10 parts of photoinitiator, 4.5 parts of enamine modified graphene oxide, 0.1 parts of leveling agent, 1.5 parts of defoaming agent, 0.5 parts of dispersing agent;

[0053] The active monomer is a mixture of propoxylated trimethylolpropane triacrylate and ethoxylated trimethylolpropane triacrylate, with a mass ratio of 1:1.

[0054] The photoinitiator is photoinitiator 819.

[0055] The leveling agent is polybutyl acrylate.

[0056] The defoaming agent is polydimethylsiloxane.

[0057] The dispersing agent is calcium stearate.

[0058] The processing method of the double-sided coated UV resin coated aluminum sheet back drill pad comprises the following steps:

[0059] First step: add the formula amount of acrylic resin, polyurethane acrylic resin, active monomer and enamine modified graphene oxide into the stirred tank, after uniform stirring, add the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent, continue to stir for 1.5h, mix uniformly, get the UV resin coating.

[0060] Second step: use a roller coater to coat the prepared coating on one side of the substrate aluminum sheet, smooth, use a UV lamp to irradiate and cure, after curing, use the same method to coat the other side of the substrate aluminum sheet and cure, the thickness of the coating is 300um.

[0061] Example 3

[0062] A double-sided coated UV resin coated aluminum sheet back drill pad, comprising a substrate aluminum sheet and a UV resin coating coated on the upper surface and the lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials by weight:

[0063] 50 parts of acrylic resin, 47 parts of polyurethane acrylic resin, 70 parts of active monomer, 12 parts of photoinitiator, 5.5 parts of enamine modified graphene oxide, 0.2 parts of leveling agent, 2.5 parts of defoaming agent, 0.4 parts of dispersing agent;

[0064] The active monomer is ethoxylated trimethylolpropane triacrylate.

[0065] The photoinitiator is photoinitiator 184.

[0066] The leveling agent is polypropyl acrylate.

[0067] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0068] The dispersing agent is zinc stearate;

[0069] The processing method of the double-sided UV resin coating coated aluminum sheet back drill pad comprises the following steps:

[0070] The first step: the formula amount of acrylic resin, polyurethane acrylic resin, active monomer and graphene oxide are added to the stirring kettle, after uniform stirring, the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent are added, and continue to stir for 2h, and mix uniformly, that is, the UV resin coating is obtained;

[0071] The second step: a roller coater is used to coat the prepared coating on one side of the substrate aluminum sheet, and the coating is leveled and cured by UV lamp irradiation. After curing, the other side of the substrate aluminum sheet is coated and cured in the same way, and the thickness of the coating is 300um.

[0072] Comparative example 1

[0073] A double-sided UV resin coating coated aluminum sheet back drill pad comprises a substrate aluminum sheet and a UV resin coating coated on the upper surface and the lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials by weight:

[0074] 50 parts of acrylic resin, 47 parts of polyurethane acrylic resin, 70 parts of active monomer, 12 parts of photoinitiator, 5.5 parts of graphene oxide, leveling agent 0.2 parts, defoaming agent 2.5 parts, dispersing agent 0.4 parts;

[0075] The active monomer is ethoxylated trimethylolpropane triacrylate;

[0076] The photoinitiator is photoinitiator 184;

[0077] The leveling agent is polypropyl acrylate;

[0078] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0079] The dispersing agent is zinc stearate;

[0080] The processing method of the double-sided UV resin coating coated aluminum sheet back drill pad comprises the following steps:

[0081] The first step: the formula amount of acrylic resin, polyurethane acrylic resin, active monomer and graphene oxide are added to the stirring kettle, after uniform stirring, the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent are added, and continue to stir for 2h, and mix uniformly, that is, the UV resin coating is obtained;

[0082] Second step: using a roller coater to coat the first step prepared paint on one side of the substrate aluminum sheet, leveling, using UV lamp irradiation curing, after curing, using the same method to coat the other side of the substrate aluminum sheet and curing, the thickness of the coating is 300um.

[0083] Comparative example 2

[0084] A double-sided coated UV resin coating aluminum sheet back drill pad, comprising a substrate aluminum sheet and a UV resin coating coated on the upper surface and lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials by weight:

[0085] 50 parts of acrylic resin, 47 parts of polyurethane acrylic resin, 70 parts of active monomer, 12 parts of photoinitiator, 5.5 parts of graphene, leveling agent 0.2 parts, defoaming agent 2.5 parts, dispersing agent 0.4 parts;

[0086] The active monomer is ethoxylated trimethylolpropane triacrylate;

[0087] The photoinitiator is photoinitiator 184;

[0088] The leveling agent is polypropylene acrylate;

[0089] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0090] The dispersing agent is zinc stearate;

[0091] The processing method of the double-sided coated UV resin coating aluminum sheet back drill pad, comprising the following steps:

[0092] First step: add the formula amount of acrylic resin, polyurethane acrylic resin, active monomer and graphene into the stirred tank, after stirring uniformly, add the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent, continue stirring for 2h, mix uniformly, get the UV resin coating;

[0093] Second step: using a roller coater to coat the first step prepared paint on one side of the substrate aluminum sheet, leveling, using UV lamp irradiation curing, after curing, using the same method to coat the other side of the substrate aluminum sheet and curing, the thickness of the coating is 300um.

[0094] Comparative example 3

[0095] A double-sided coated UV resin coating aluminum sheet back drill pad, comprising a substrate aluminum sheet and a UV resin coating coated on the upper surface and lower surface of the aluminum sheet, wherein the UV resin coating comprises the following raw materials by weight:

[0096] 50 parts of acrylic resin, 47 parts of polyurethane acrylic resin, 70 parts of reactive monomer, 12 parts of photoinitiator, 0.2 parts of leveling agent, 2.5 parts of defoaming agent, 0.4 parts of dispersing agent;

[0097] The reactive monomer is ethoxylated trimethylolpropane triacrylate;

[0098] The photoinitiator is photoinitiator 184;

[0099] The leveling agent is polypropyl acrylate;

[0100] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0101] The dispersing agent is zinc stearate;

[0102] The processing method of the double-sided coated UV resin coated aluminum sheet back drill pad, comprising the following steps:

[0103] First step: add the formula amount of acrylic resin, polyurethane acrylic resin and reactive monomer into the stirring kettle, after uniform stirring, add the formula amount of photoinitiator, leveling agent, defoaming agent and dispersing agent, continue to stir for 2h, mix uniformly, get the UV resin coating;

[0104] Second step: use a roller coater to coat a layer of coating prepared in the first step on one side of the substrate aluminum sheet, smooth, use UV lamp to irradiate and cure, after curing, use the same method to coat the other side of the substrate aluminum sheet and cure, the thickness of the coating is 300um.

[0105] Coating performance test

[0106] Water contact angle test: use video optical contact angle tester ADSA-Realdrop®-C601 to test the water contact angle of the coating surface;

[0107] Neutral salt spray performance: test according to ASTM-B117 standard;

[0108] Adhesion of coating film: test according to GB / T9286-1998;

[0109] The specific test results are shown in Table 1:

[0110]

[0111] As shown in Table 1, the coating on the two sides of the back drill pad plate of the aluminum sheet prepared in Examples 1-3 has good corrosion resistance, the corrosion resistance of Comparative Example 1 is not as good as that of Comparative Example 2, and the possible reason is that the graphene oxide contains a large number of hydrophilic groups such as hydroxyl and carboxyl groups, and the coating of Comparative Example 1 is more hydrophilic than the blank coating of Comparative Example 3, resulting in poor corrosion resistance. Although the coating of Comparative Example 2 shows a certain corrosion resistance and waterproofness, the agglomeration of graphene makes the corrosion resistance relatively poor.

[0112] The above is only an example and description of the concept of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, which should belong to the protection scope of the present application.

Claims

1. A double-sided UV resin coated aluminum sheet backing pad, characterized in that: The material includes an aluminum substrate and a UV resin coating applied to the upper and lower surfaces of the aluminum substrate, wherein the UV resin coating comprises the following raw materials in parts by weight: 40-50 parts acrylic resin, 40-50 parts polyurethane acrylic resin, 50-70 parts reactive monomer, 7-12 parts photoinitiator, 3.5-5.5 parts enamine-modified graphene oxide, 0.1-0.3 parts leveling agent, 1-3 parts defoamer, and 0.1-0.5 parts dispersant; The active monomer is one or more of pentaerythritol tetraacrylate, propoxylated trimethylolpropane triacrylate, and ethoxylated trimethylolpropane triacrylate. The photoinitiator is one of photoinitiator TPO, photoinitiator 819, and photoinitiator 184; The preparation method of the enamine-modified graphene oxide is as follows: S1, Acylation of graphene oxide Weigh 1.0-1.3g of graphene oxide and 100-120ml of N,N-dimethylformamide and add them to a reaction flask equipped with a reflux device. Start stirring and slowly add 3.5-4.0g of SOCl2. After the addition is complete, start heating and maintain the temperature with stirring for 40-50h. After the reaction is complete, allow it to cool naturally to room temperature, filter, wash with anhydrous diethyl ether, and dry to obtain acylated graphene oxide. The temperature for maintaining the temperature in step S1 is 65-75℃. S2, Preparation of enamine-modified graphene oxide Measure 400-450 ml of tetrahydrofuran solvent and add the acylated graphene oxide prepared in S1 to a reaction flask, then add 0.7-0.85 g of undecane-10-en-1-amine, start stirring and heating, and keep the reaction at this temperature for 48-72 h. After the reaction is complete, let it cool naturally to room temperature, filter, wash with anhydrous diethyl ether, and dry to obtain enamine-modified graphene oxide; the temperature for keeping the reaction in step S2 is 65-70℃.

2. The aluminum sheet back drill pad with double-sided UV resin coating according to claim 1, characterized in that: The leveling agent is polybutyl acrylate or polypropyl acrylate.

3. The aluminum sheet back drill pad with double-sided UV resin coating as described in claim 1, characterized in that: The defoamer is polyoxyethylene polyoxypropylene pentaerythritol ether or polydimethylsiloxane.

4. The aluminum sheet back drill pad with double-sided UV resin coating according to claim 1, characterized in that: The dispersant is calcium stearate or zinc stearate.

5. A method for processing an aluminum sheet back drill pad with a double-sided UV resin coating as described in claim 1, characterized in that: Includes the following steps: Step 1: Add the formulated amounts of acrylic resin, polyurethane acrylic resin, active monomer, and enamine-modified graphene oxide to a mixing tank and stir until homogeneous. Then add the formulated amounts of photoinitiator, leveling agent, defoamer, and dispersant, and continue stirring for 1-2 hours until homogeneous to obtain the UV resin coating. Step 2: Apply a layer of the coating prepared in Step 1 to one side of the substrate aluminum sheet using a roller coater, smooth it out, and cure it with a UV lamp. After curing, apply the same coating to the other side of the substrate aluminum sheet and cure it to obtain an aluminum sheet back drill pad with a double-sided UV resin coating; the coating thickness is 300-350um.

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