TW201402804A - Lubricant entry sheet for drilling and method for producing the same - Google Patents

Abstract

The invention relates to a lubricant entry sheet for drilling consisting of a metallic sheet and a lubricant sheet formed on at least one surface of the metallic sheet, characterized in that the lubricant sheet comprises (A) a lubricant, (B) a water-soluble resin, (C) a filler and (D) nanopowder. The homogeneity and the thickness of the lubricant sheet can be increased by homogeneously blending the nanopowder and the filler with the lubricant and the water-soluble resin, whereby the precision of the position of the drilled hole is effectively raised.

Description

Lubricating cover plate for drilling and manufacturing method thereof

The present invention relates to a lubricating cover for drilling and a method of manufacturing the same. In particular, the present invention relates to a lubrication lug cover for drilling that improves the accuracy of a drilling position and a method of manufacturing the same.

As electronic products move toward higher density and miniaturization, the requirements for printed circuit boards used in electronic products are becoming increasingly stringent. For example, hundreds of thousands of holes are often required in printed circuit boards, so the minimum through-hole diameter tends to drop to about 0.05 mm, and the requirements for borehole position accuracy and through-hole wall surface roughness are becoming more stringent.

In addition, in order to efficiently drill hundreds of thousands of holes in the printed circuit board, the high-speed rotating drill must be quickly drilled, withdrawn, etc., resulting in extremely easy wear and tear of the drill bit, while in the process of rapid mechanical drilling. The heat generated can accumulate on the drill bit, causing the temperature of the drill bit and the printed circuit board to rise, potentially damaging the electronic components already present in the circuit board. Therefore, it is necessary to provide effective lubrication and cooling of the drill bit to prevent the temperature rise of the circuit board, improve the quality of the drill hole and extend the service life of the drill bit.

It is known to apply a lubricant layer on the aluminum cover for drilling to provide the lubrication and cooling required for the drill bit. Taiwan Patent Publication No. 200938025 discloses a lubricating cover plate for drilling, which is first coated with a film of a thermosetting resin composition on an aluminum cover plate, and further thermosetting. A multilayer aqueous lubricant is coated on the resin composition film. However, since the viscosity of the aqueous lubricant is low, the uniformity of coating is poor, and the coating must be repeated a plurality of times to achieve the desired uniformity and thickness (at least 50 μm), so that the manufacturing cost becomes quite high.

Taiwan Patent Publication No. 200938039 discloses a lubricating lug cover for drilling a resin composition composed of polyethylene oxide and polyethylene glycol on an aluminum cover. By adjusting the ratio of polyethylene oxide to polyethylene glycol, although the problem of film thickness uniformity can be solved, the resin composition composed of polyethylene oxide and polyethylene glycol is not easy to be drilled. The non-conductive resin composition which is removed in the hot water bath and remains in the through hole is liable to cause a continuous conductor to be formed in the through hole during subsequent plating, thereby causing a poor yield of the printed circuit board.

In other words, the conventional lubricating cover for drilling is limited by the coatability of the lubricant, and the desired thickness and uniformity cannot be achieved in a single coating, and the coating property of the resin composition is adjusted to cause It is difficult to remove, so there is a need for an improved lubrication cover for drilling, which can overcome the aforementioned problems, in order to achieve better film thickness uniformity, faster manufacturing process, lower manufacturing cost, and higher quality. rate.

In order to solve the problems of the foregoing and the prior art, an object of the present invention is to provide a lubricating cover plate for drilling, which is characterized in that the coating property and the water washing removal property are adjusted by adding a nano powder and a filler to the resin composition. Better film thickness uniformity, faster manufacturing process, lower manufacturing cost, Better drilling position accuracy and smaller hole wall roughness.

The lubricating cover for drilling is provided by a metal sheet and a lubricating sheet formed on at least one surface of the metal sheet, characterized in that the lubricating sheet comprises: (A) a lubricant (B) a water-soluble resin; (C) a filler; and (D) a nanopowder.

In an embodiment of the present invention, the lubricant (A) is contained in an amount of 10 to 60% by weight, preferably 20 to 50% by weight based on 100% by weight of the total weight of the lubricating sheet; The content of (B) is from 1 to 50% by weight, preferably from 5 to 20% by weight; the filler (C) content is from 1 to 60% by weight; and the content of the nanopowder (D) is from 0.1 to 10% by weight It is preferably from 0.5 to 6% by weight, most preferably from 1 to 3% by weight.

In an embodiment of the present invention, the lubricant (A) is preferably selected from the group consisting of polyethylene glycol, polypropylene glycol, monoether of polyoxyethylene, ester of polyoxyethylene, and polyoxyethylene sorbitan monostearate. Ester, polyglycerol monostearate, polyoxyethylene-propylene copolymer or derivative thereof, talc, calcium carbonate or mixtures thereof.

In an embodiment of the present invention, the water-soluble resin (B) is preferably selected from the group consisting of polyethylene oxide, polypropylene oxide, sodium polyacrylate, polypropylene decylamine, polyvinylpyrrolidone, carboxymethyl cellulose, Polytetramethylene glycol or polyether ester, or a mixture thereof.

In an embodiment of the invention, the nanopowder (C) is preferably selected from the group consisting of Ceria, aluminum hydroxide or a mixture thereof.

In an embodiment of the invention, the nanopowder (C) has a particle diameter of from 1 to 30 nm, preferably from 1 to 20 nm.

In an embodiment of the invention, the filler (D) is preferably selected from the group consisting of talc, calcium carbonate, titanium dioxide, barium sulfate, acid clay, molybdenum disulfide, graphite or a mixture thereof.

In one embodiment of the present invention, the filler (D) has a particle diameter of 0.5 to 20 μm.

In an embodiment of the invention, the lubricating sheet has a thickness of from 1 to 100 μm, preferably from 20 to 80 μm, most preferably from 50 to 80 μm.

The present invention further provides a method for producing a lubricating cover for drilling, comprising the steps of: (a) preparing a resin composition comprising: (A) a lubricant, (B) a water-soluble resin, (C) a filler, and (D) nanopowder; and (b) applying the resin composition to at least one surface of a metal sheet, followed by drying and curing to obtain (A) a lubricant, B) Lubricating cover for drilling a lubricating sheet composed of a water-soluble resin, (C) filler, and (D) nanopowder.

In one embodiment of the present invention, the solvent contained in the resin composition is water or an alcohol which is well known to those skilled in the art, and is preferably isopropanol or propylene glycol methyl ether.

Although the invention will be described in terms of several preferred embodiments, other embodiments of the art that are known to those of ordinary skill in the art (including embodiments that do not provide all of the advantages and features mentioned herein) also fall This hair In the scope of Ming. Accordingly, the scope of the invention is defined by the scope of the appended claims and their equivalents.

Further, it is to be understood that any suitable substitute can be used as the metal sheet used as the substrate in the lubricating cover for drilling of the present invention, and for example, an aluminum foil, a resin substrate or the like can be used. Further, the resin composition of the present invention may optionally contain various additives such as a coloring agent, a dye, an organic or inorganic filler, an organic solvent and the like, as needed.

Further, the resin composition of the present invention may be coated by any one of a roller, a Mayer bar coating, a gravure coating, a reverse roll coating, an extrusion die coating, a wheel coating, and a roll coating. The method is laminated on one or both surfaces of the metal sheet. Further, the resin composition may be kneaded in a kneader and then passed through a heating roll to form a sheet of the resin composition, which is then laminated on one or both surfaces of the metal sheet in a laminator. Such alternatives, additions or equivalent variations will be apparent to those skilled in the art.

The objects, functions, features, and advantages of the present invention will become more apparent from the description of the appended claims.

Please refer to FIG. 1 , which is a schematic cross-sectional view showing a lubricating cover 10 for drilling according to the present invention when it is placed on a laminate 20 for drilling. The lubricating lubricating cover 10 for drilling according to the present invention is composed of a metal sheet 14 and a lubricating sheet 12 formed on at least one surface of the metal sheet 14, and a lubricating cover 10 for drilling It is placed on the laminate 20, and the lower side of the laminate 20 is supported by the backing plate 30. When the drill bit 40 is drilled downward, the lubricating sheet 12, the metal sheet 14, and the laminate 20 are sequentially passed through, and after reaching the required depth, the drill bit is rotated in the opposite direction to exit the hole.

Further, a method of manufacturing the lubricating cover for drilling according to the present invention will be described.

Preparation of Resin Composition I of the Invention

21% by weight of polyethylene oxide and 21% by weight of talc powder were mixed in a high-speed mixer, and then 1.7% by weight of cerium oxide nanopowder (particle diameter: 20 nm or less) was added to the mixture and stirred at a high speed. 24% by weight of polyethylene glycol was melted into a liquid at a temperature of 55 ° C, and added to the above mixture and stirred at a high speed. Finally, propylene glycol methyl ether was added to make the mixture 100% by weight to prepare a resin composition.

Preparation of Resin Composition II of the Invention

A resin composition II was prepared in the same manner as in the above Example 1 except that the addition ratio of the cerium oxide nanopowder was changed to 3% by weight.

Preparation of Resin Composition III of the Invention

A resin composition III was prepared in the same manner as in the above Example 1 except that the addition ratio of the cerium oxide nanopowder was changed to 5% by weight.

Preparation of Control Resin Composition IV

A control resin composition IV was produced in the same manner as in the above Example 1 except that the cerium oxide nanopowder was not added.

Example 1

Before using the above resin compositions I to IV, the hardeners were separately added in a weight ratio of the resin inhibitor: hardener = 10:1 and uniformly mixed. The resulting resin composition was applied onto at least one surface of an aluminum plate (thickness: 70 μm), and then the resin compositions were dried and cured at about 150 ° C for about 2 minutes to form a lubricating cover for drilling. The lubricating sheet was measured by a thickness measuring device to obtain a film thickness of about 70 μm.

The lubricating lube cover plate made in the above manner is further disposed on the pre-drilled laminate, and the underside of the laminate is additionally supported by the backing plate. When the drill bit is drilled down, it will pass through the lubricated sheet, metal sheet and laminate in sequence. After reaching the required depth, the drill will rotate in the opposite direction and exit the hole. After the drilled laminate is placed in a hot water bath, the lubricating material remaining on the surface and the resin material remaining in the hole are removed, and after drying, the residual state of the resin material or the crumb in the hole after the washing is observed, and the result is recorded. In the following Table 1.

It can be seen from the results of Table 1 that the lubricating lubricating plate for drilling according to the present invention can be used as a lubricating cover for drilling when applied to a laminate, thereby exhibiting excellent lubrication and cooling effects, and effectively improving the position of the drilling hole. Degree and reduce debris generated by drilling to achieve better film thickness uniformity, faster manufacturing process, lower manufacturing cost, better drilling position accuracy, and smaller hole wall roughness .

Example 2

The resin composition I of the present invention and the hardener are uniformly mixed in a weight ratio of 10:1, and then the prepared resin composition is separately coated on at least one surface of two aluminum plates, and then one of them is given The resin composition was dried and solidified by the temperature change and the sample transport speed shown in Fig. 2 to obtain the lubricating cover samples a and b for the drilling (the adhesive surface was 5B).

The drilling cover sheets A and B for drilling and the control sample C (purchased from Mitsubishi Gas Chemical Co., model LE 800) were respectively placed on the pre-drilled laminate (number of laminations: BT-NX-t0.1 mm× 6PNL), the bottom of the laminate is additionally supported by a backing plate (ie, urea board) to prepare a test sample. This A, B and C (control group). Test samples A, B and C were drilled using a drilling machine according to the following conditions:

‧Drill: 0.1mm

‧Speed: 300.Krpm

‧Infeed speed: 2.4 m/min

‧Return speed: 50.0 m/min

‧ Hole limit: 6000 hits

When the drill bit is drilled down, the lubricated sheet, sheet metal, and laminate are sequentially passed through, and when the desired depth is reached, the drill bit is rotated in the opposite direction to exit the hole.

The drilled laminate is placed in a hot water bath to remove the surface of the lubricating sheet and the resin material remaining in the hole, and dried.

It can be seen from the drilling test photograph of Fig. 2 that the test sample B according to the present invention has a clogging phenomenon after the drilling process has been performed. In addition, it can be clearly seen from the drilling test target chart of FIG. 3 that after three rounds and 3000 holes per round, the accuracy of the drilling measured by the sample A or B according to the present invention is comparable to that of the drilling. Control sample C was high. Further, from Table 3, it is also known that the cpk values measured by the samples A or B according to the present invention are higher than those of the control sample C. Therefore, the lubricating sheet according to the present invention has superior drilling performance as compared with the known lubricating sheet such as the control sample C.

Since the lubricating sheet of the lubricating lubricating plate for drilling of the present invention contains a filler and a nano powder which can provide lubrication and protection functions, the protection of the drill bit can be increased to improve the service life of the drill bit, and, due to the filler and the nano powder The existence of the drill bit can reduce the hole with better roundness due to the friction reduction during the drilling operation, and the lubricating piece of the invention can be easily removed without causing residue and hindering the subsequent plating operation, and The uniform thickness of the lubricated sheet provides uniform and good drilling lubrication.

While the present invention has been described in detail by the preferred embodiments of the present invention, it is not intended to limit the invention, and the present invention may be variously modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

10‧‧‧ Cover

12‧‧‧Lubricating film

14‧‧‧metal piece

20‧‧‧Laminated board

30‧‧‧ pads

40‧‧‧ drill bit

DY, -DY‧‧‧ Y-axis direction of the drilling position

DX, -DX‧‧‧ X-axis direction of the drilling position

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a lubricating cover plate for drilling according to the present invention when it is placed on a laminate for drilling.

Figure 2 is a photograph of a borehole test.

Figure 3 (a) is a view of a borehole test target of Sample A in accordance with the present invention.

Figure 3 (b) is a drilling test target image of Sample B according to the present invention.

Figure 3 (c) is a drilling test target image of Comparative Sample C.

10‧‧‧ Cover

12‧‧‧Lubricating film

14‧‧‧metal piece

20‧‧‧Laminated board

30‧‧‧ pads

40‧‧‧ drill bit

Claims (18)

A lubricating cover plate for drilling, which is composed of a metal sheet and a lubricating sheet formed on at least one surface of the metal sheet, characterized in that the lubricating sheet comprises: (A) a lubricant; (B) a water-soluble solution Resin; (C) filler; and (D) nanopowder. The lubricating cover for drilling according to the first aspect of the invention, wherein the lubricant (A) is contained in an amount of 10 to 60% by weight based on 100% by weight of the total weight of the lubricating sheet; The content of (B) is from 1 to 50% by weight; the filler (C) content is from 1 to 60% by weight; and the content of the nanopowder (D) is from 0.1 to 10% by weight. The lubricating cover plate for drilling according to claim 1 or 2, wherein the lubricant (A) is selected from the group consisting of polyethylene glycol, polypropylene glycol, monoether of polyoxyethylene, ester of polyoxyethylene, and poly A group consisting of oxyethylene sorbitan monostearate, polyglycerol monostearate, a polyoxyethylene-propylene copolymer or derivative thereof, talc, calcium carbonate, and mixtures thereof. The lubricating cover sheet for drilling according to claim 1 or 2, wherein the water-soluble resin (B) is selected from the group consisting of polyethylene oxide, polypropylene oxide, sodium polyacrylate, polypropylene decylamine, and poly A group consisting of vinylpyrrolidone, carboxymethylcellulose, polytetramethylene glycol or polyetherester, and mixtures thereof. The lubricating cover for drilling according to claim 1 or 2, wherein the nanopowder (D) is cerium oxide, aluminum hydroxide or a mixture thereof. The lubricating cover for drilling according to claim 1 or 2, wherein the nano powder (D) has a particle diameter of 1 to 30 nm. A lubricating cover for drilling according to claim 1 or 2, wherein the lubricating sheet has a thickness of 1 to 100 μm. The lubricating cover for drilling according to the first aspect of the invention, wherein the filler (C) is preferably selected from the group consisting of talc, calcium carbonate, barium sulfate, acid clay, molybdenum disulfide, graphite or a mixture thereof. The lubricating cover for drilling according to claim 1 or 8, wherein the filler (C) has a particle diameter of 0.5 to 20 μm. A method for manufacturing a lubricating cover for drilling, comprising the steps of: (a) preparing a resin composition comprising: (A) a lubricant, (B) a water-soluble resin, (C) a filler, and (D) a nanopowder; and (b) applying the resin composition to at least one surface of a metal sheet, followed by drying and solidifying to obtain a water-soluble (A) lubricant, (B) Lubricating cover for drilling a lubricating sheet composed of a resin, (C) filler, and (D) nanopowder. The method of claim 10, wherein the lubricant (A) is contained in an amount of 10 to 60% by weight based on 100% by weight of the total weight of the lubricating sheet; and the water-soluble resin (B) The content is from 1 to 50% by weight; the filler (C) content is from 1 to 60% by weight; And the content of the nanopowder (D) is from 0.1 to 10% by weight. The method of claim 10, wherein the lubricant (A) is selected from the group consisting of polyethylene glycol, polypropylene glycol, monoether of polyoxyethylene, ester of polyoxyethylene, polyoxyethylene sorbitol. A group consisting of monostearate, polyglycerol monostearate, polyoxyethylene-propylene copolymer or derivatives thereof, talc, calcium carbonate, and mixtures thereof. The method of claim 10, wherein the water-soluble resin (B) is selected from the group consisting of polyethylene oxide, polypropylene oxide, sodium polyacrylate, polypropylene decylamine, polyvinylpyrrolidone, and carboxymethyl A group consisting of cellulose, polytetramethylene glycol or polyether ester, or a mixture thereof. The method of claim 10, wherein the nanopowder (D) is cerium oxide, aluminum hydroxide or a mixture thereof. The method of claim 10, wherein the nanoparticle (D) has a particle diameter of from 1 to 30 nm. The method of claim 10, wherein the lubricating sheet has a thickness of from 1 to 100 μm. The method of claim 10, wherein the filler (C) is preferably selected from the group consisting of talc, calcium carbonate, molybdenum disulfide, graphite, or a mixture thereof. The lubricating cover for drilling according to claim 10 or 17, wherein the filler (C) has a particle diameter of 0.5 to 20 μm.