CN114378988A - Brush wheel, manufacturing method thereof and brush wheel die - Google Patents
Brush wheel, manufacturing method thereof and brush wheel die Download PDFInfo
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- CN114378988A CN114378988A CN202011141037.8A CN202011141037A CN114378988A CN 114378988 A CN114378988 A CN 114378988A CN 202011141037 A CN202011141037 A CN 202011141037A CN 114378988 A CN114378988 A CN 114378988A
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- 230000035882 stress Effects 0.000 claims description 44
- 230000006835 compression Effects 0.000 claims description 39
- 238000007906 compression Methods 0.000 claims description 39
- 238000004132 cross linking Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 29
- 239000003054 catalyst Substances 0.000 claims description 22
- 239000003431 cross linking reagent Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 19
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- 238000006243 chemical reaction Methods 0.000 claims description 8
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- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- PCSMJKASWLYICJ-UHFFFAOYSA-N Succinic aldehyde Chemical compound O=CCCC=O PCSMJKASWLYICJ-UHFFFAOYSA-N 0.000 claims description 3
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229940077388 benzenesulfonate Drugs 0.000 claims description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 3
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 claims description 3
- 229940015043 glyoxal Drugs 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- ZPIRTVJRHUMMOI-UHFFFAOYSA-N octoxybenzene Chemical compound CCCCCCCCOC1=CC=CC=C1 ZPIRTVJRHUMMOI-UHFFFAOYSA-N 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N valeric aldehyde Natural products CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 230000001804 emulsifying effect Effects 0.000 claims 7
- 238000013022 venting Methods 0.000 claims 2
- 238000009828 non-uniform distribution Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 238000005187 foaming Methods 0.000 abstract description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 132
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- 238000012360 testing method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- 238000009826 distribution Methods 0.000 description 2
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
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- 238000007655 standard test method Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
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- 230000001413 cellular effect Effects 0.000 description 1
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- 239000000356 contaminant Substances 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B08B1/12—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2029/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
- B29K2029/04—PVOH, i.e. polyvinyl alcohol
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims
Abstract
The invention provides a brush wheel, a manufacturing method thereof and a brush wheel die, wherein the brush wheel is manufactured in a foaming mode of a gaseous pore-filling agent, so that the problem that residues from the solid pore-filling agent exist in the brush wheel and are derived in the conventional manufacturing mode of foaming the solid pore-filling agent is solved. In addition, the brush wheel of the invention has a plurality of fluid channels which are communicated between any two adjacent brush wheels, and the fluid channels respectively extend to the surface of the brush wheel, so as to form pores, thereby improving the fluid penetrability of the brush wheel.
Description
Technical Field
The present invention relates to a brush wheel, a method for manufacturing the same, and a brush wheel mold, and more particularly, to a brush wheel for brushing a circuit board, a method for manufacturing the same, and a brush wheel mold.
Background
In the electronic industry, it is often necessary to use a brush wheel to scrub contaminants remaining on the surface of a circuit substrate, and at present, the manufacture of the brush wheel usually requires adding a solid pore-filling agent to foam, so that the physical properties of the manufactured brush wheel meet the requirements. Solid materials such as starch, calcium carbonate, sodium bicarbonate, magnesium silicate, barite powder, quartz powder, gypsum powder, diatomaceous earth, kaolin, rosin, and glass powder can be used as the solid pore-filling agent, and starch is the most commonly used solid pore-filling agent.
However, the solid pore-filling agent is not easy to be taken out from the manufactured brush wheel and has a problem of residue, so that the current brush wheel for brushing the circuit substrate is often plugged by the solid pore-filling agent due to poor fluid permeability, so that the brushing liquid is not easy to pass through, and the brushing efficiency of the circuit substrate is not as expected. Even more, the solid pore-filling agent remaining on the brush wheel may fall off during the process of brushing the circuit substrate by the brush wheel, and adhere to the circuit substrate, thereby affecting the yield of the circuit substrate.
In addition, if starch is used as the solid pore-filling agent, bacteria are easily grown in the residual solid pore-filling agent (i.e., starch), and in order to avoid bacteria growth on the brush wheel by the residual solid pore-filling agent (i.e., starch), additives such as bactericide and bacteriostatic agent are added to the brush wheel, however, the additives are also easily left on the brush wheel, which affects the yield of the circuit substrate.
Furthermore, the residue inside the brush wheel (i.e. the solid-state pore-filling agent) affects the yield of the circuit substrate, so that the cleaning procedure (hours or even days) of the residue is usually performed on the machine before the brush wheel is used to brush the circuit substrate, which results in the decrease of the production on-line equipment utilization.
Accordingly, the technical problem to be solved is how to solve the problems caused by the solid pore-filling agent, which causes residues in the brush wheel and further causes the use of the brush wheel.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a brush wheel manufacturing method for manufacturing a brush wheel, the brush wheel manufacturing method comprising the steps of: preparing a PVA material, a cross-linking agent, a gaseous pore filling agent and a brush wheel mold; dissolving a PVA material in water to form an aqueous PVA solution; adding a cross-linking agent into the PVA aqueous solution to perform a cross-linking reaction on the PVA material in the PVA aqueous solution to form a PVA cross-linking solution; adding a gaseous pore filling agent into the PVA cross-linking solution and stirring to uniformly mix the gaseous pore filling agent and the PVA cross-linking solution to form a PVA emulsion solution, wherein the PVA emulsion solution contains uniformly distributed bubbles formed by the gaseous pore filling agent; and putting the PVA emulsion into a brush wheel mould for curing until the PVA emulsion is cured into a solid state to form a brush wheel with a compression stress meeting the expectation under the condition of a preset compression ratio, wherein any two adjacent air bubbles uniformly distributed in the PVA emulsion are communicated to form a plurality of fluid channels on the brush wheel, and any two adjacent fluid channels are also communicated and extend to the surface of the brush wheel to form pores for fluid penetration.
Preferably, in the brush wheel manufacturing method, a catalyst is further prepared, and the catalyst is added in the formation process of the PVA crosslinking solution or the PVA emulsion solution, so that the PVA crosslinking solution or the PVA emulsion solution contains the catalyst for catalyzing the crosslinking reaction, wherein the weight percentage of the catalyst in the PVA emulsion solution is between 1.5% and 5%; the catalyst comprises at least one member selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.
Preferably, in the brush wheel manufacturing method, a surfactant is further prepared, and is added in the forming process of the PVA crosslinking solution or the PVA emulsion solution, so that the PVA crosslinking solution or the PVA emulsion solution contains the surfactant, thereby maintaining the state of bubbles in the PVA emulsion solution, wherein the weight percentage of the surfactant in the PVA emulsion solution is between 0.4% and 1.4%; the surfactant comprises at least one member selected from the group consisting of diglycerol polypropylene glycol ether, polyoxyethylene stearate, polyethylene glycol octyl phenyl ether, and sodium alkyl benzene sulfonate.
Preferably, in the brush wheel manufacturing method, the weight percentage of the cross-linking agent in the PVA emulsion solution is between 3% and 9%; the crosslinking agent comprises at least one member selected from the group consisting of formaldehyde, acetaldehyde, glyoxal, propionaldehyde, butyraldehyde, succinaldehyde, and glutaraldehyde.
Preferably, in the brush wheel manufacturing method, the volume ratio of the gaseous pore-filling agent in the PVA emulsion solution is between 31% and 45%.
Preferably, in the above brush wheel manufacturing method, the aging temperature of the PVA emulsion solution is between 42 ℃ and 65 ℃.
Preferably, in the above brush wheel manufacturing method, during the curing process of the PVA emulsion in the brush wheel mold, the brush wheel mold is rotated to reduce the floating area range of the bubbles of the PVA emulsion, so as to maintain the uniform distribution of the bubbles in the PVA emulsion.
Moreover, the invention also provides a brush wheel which is manufactured by the manufacturing method of the brush wheel.
Preferably, in the brush wheel, the surface of the brush wheel has a plurality of brush blocks, each brush block has a brush body and at least one side support, and the side support is combined with the brush body and located at the side edge of the brush body to provide lateral support for the brush body.
Preferably, in the brush wheel, the side stay is one side stay extending along a side edge of the brush body to form a ring shape.
Preferably, in the brush wheel, the side supporting bodies are respectively located at two side supporting bodies at the left and right sides of the brush body.
Preferably, in the brush wheel, the side supporting bodies are four side supporting bodies respectively located at four side edges of the brush body.
Preferably, in the brush wheel, the side stay is a triangular column.
In addition, the invention also provides a brush wheel mould which is used for putting the PVA emulsion solution so as to manufacture the brush wheel, and the brush wheel mould comprises a mould cavity, wherein the mould cavity is provided with a brush body forming part for forming the brush body and a side support body forming part for forming the side support body. The side support forming part is provided with an auxiliary exhaust structure, when the PVA emulsion solution is put into the side support forming part, the auxiliary exhaust structure is positioned at the side edge of the brush body forming part, and the prior gas in the mold cavity is removed in an auxiliary mode, so that the problem that the prior gas is remained in the mold cavity to cause the problem that the pores of the manufactured brush wheel cannot be uniformly distributed is avoided.
Preferably, in the brush wheel mold, the auxiliary exhaust structure is a guide slope, and the guide slope guides the previous gas to leave the mold cavity to assist in exhausting the previous gas.
Compared with the prior art, the brush wheel, the manufacturing method thereof and the brush wheel mold provided by the invention have the advantages that the brush wheel which is provided with the pores and is penetrated by fluid is manufactured in a foaming mode of the gaseous pore-filling agent, and the problem that the brush wheel manufactured in a foaming mode of the solid pore-filling agent has residues of the solid pore-filling agent in the brush wheel and is derived is solved. In addition, in the brush wheel manufacturing method of the present invention, after the PVA emulsion solution is cured, a brush wheel having a compressive stress under a predetermined compression ratio that meets the requirement may be formed, so that the brush wheel may be used for brushing a circuit substrate, and the brush wheel has a plurality of fluid channels that are connected to any adjacent two of the fluid channels, and the fluid channels extend to the surface of the brush wheel to form pores for fluid penetration, so that the brush wheel of the present invention has excellent fluid penetration.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing a brush wheel according to the present invention.
Fig. 2 is a perspective view of one embodiment of the brush wheel of the present invention.
Fig. 3 is a schematic view showing a use state of the brush wheel shown in fig. 2.
Fig. 4 is a schematic view of a plurality of fluid channels in a brush wheel according to the present invention, wherein any two adjacent fluid channels are connected and extend to the surface of the brush wheel to form pores for fluid penetration.
Fig. 5 is a partially enlarged view of the region indicated by the symbol X in fig. 4.
Fig. 6 is a partially enlarged view of the area indicated by the symbol Y in fig. 4.
Fig. 7 shows a schematic side view of a first embodiment of a brush block of a brush wheel according to the invention.
Fig. 8 shows a schematic top view of a brush block of a brush wheel according to a second embodiment of the invention.
Figure 9 shows a high resolution image of the apertures in a brush wheel according to the present invention.
Fig. 10 is a partial schematic view of a mold cavity of a brush wheel mold of the present invention.
FIG. 11 is a schematic view showing the mold cavity of the brush wheel mold shown in FIG. 10 being purged of precursor gas during insertion of a PVA emulsion solution.
Description of the reference symbols
1 Brush wheel
11 brush block
12 brush body
13 side support
14 fluid channel
2 Circuit Board
21 face to be brushed
3 brush wheel mould
31 mould cavity
311 Brush body Molding part
3111 auxiliary exhaust structure
312 side support body forming part
L PVA emulsion solution
G leading gas
F fluid
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the description herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways. Various modifications and alterations may be made in the details of this description without departing from the spirit of the invention, from its aspects and applications.
The invention provides a brush wheel, a manufacturing method thereof and a brush wheel die, wherein the manufactured brush wheel can be used for brushing a circuit substrate of a semiconductor wafer, and is mainly manufactured by foaming a gaseous pore-filling agent, so that no residue exists in the manufactured brush wheel, and the physical properties meet the requirements of brushing the circuit substrate.
The physical characteristics of the brush wheel are mainly due to the integrated circuit on the circuit substrate, and in order to prevent the circuit substrate from being damaged during the brushing process, the physical characteristics of fluid permeability (or Porosity) of the brush wheel are strictly required, and the brush wheel has enough pores for the brushing liquid to pass through, so that the brushing liquid can provide a role in the brushing process of the circuit substrate. In addition, the physical characteristics of the compressive stress of the brush wheel under the condition of the predetermined compression ratio are strictly required to meet the appropriate interval value between the upper limit value and the lower limit value, because the brushing efficiency of the brush wheel on the circuit substrate is not as expected if the compressive stress of the brush wheel under the condition of the predetermined compression ratio is smaller than the lower limit value of the appropriate interval during the brushing process of the circuit substrate, and in addition, the brushing of the brush wheel is easy to damage the circuit substrate if the compressive stress of the brush wheel under the condition of the predetermined compression ratio is larger than the upper limit value of the appropriate interval.
For the technical idea of the present invention, please refer to fig. 1 to fig. 11 together.
As shown in fig. 1, the manufacturing method of the brush wheel of the present invention mainly comprises the following steps:
step S1, preparing PVA material, cross-linking agent, gaseous pore-filling agent and brush wheel mould.
Note that the PVA material is Polyvinyl Alcohol (Polyvinyl Alcohol).
Step S2, the PVA material is dissolved in water to form an aqueous PVA solution.
And step S3, adding a cross-linking agent into the PVA aqueous solution to perform a cross-linking reaction on the PVA material in the PVA aqueous solution to form a PVA cross-linking solution.
It should be noted that the cross-linking agent may be selected to include at least one selected from the group consisting of formaldehyde, acetaldehyde, glyoxal, propionaldehyde, butyraldehyde, succinaldehyde, and glutaraldehyde, and the mixture of the PVA aqueous solution and the cross-linking agent may be stirred to uniformly mix the PVA aqueous solution and the cross-linking agent.
Preferably, in the brush wheel manufacturing method of the present invention, a catalyst may be prepared, and the catalyst may be added during the formation of the PVA crosslinking solution or the PVA emulsion solution, so that the PVA crosslinking solution or the PVA emulsion solution contains the catalyst and is used for catalyzing the crosslinking reaction, so that the formation of the PVA crosslinking solution is expected.
It should be noted that the catalyst may optionally include at least one member selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid.
And step S4, adding a gaseous pore filling agent into the PVA cross-linking solution, and stirring to uniformly mix the gaseous pore filling agent and the PVA cross-linking solution to form a PVA emulsion solution, wherein the PVA emulsion solution contains uniformly distributed bubbles generated by the gaseous pore filling agent.
It should be noted that, in the present invention, the gaseous pore-filling agent mainly forms bubbles in the PVA emulsion solution without participating in chemical reaction, so the gaseous pore-filling agent may be selected from air or at least include a component selected from a group consisting of inert gases such as nitrogen and helium.
Preferably, in the brush wheel manufacturing method of the present invention, a surfactant may be prepared and added during the formation of the PVA crosslinking solution or the PVA emulsion solution, so that the PVA crosslinking solution or the PVA emulsion solution contains the surfactant for maintaining the state of bubbles in the PVA emulsion solution.
It should be noted that the surfactant may optionally include at least one selected from the group consisting of diglycerol polypropylene glycol ether, polyoxyethylene stearate, polyethylene glycol octyl phenyl ether, and sodium alkyl benzene sulfonate.
Step S5, placing the PVA emulsion solution into the brush wheel mold to be cured until the PVA emulsion solution is cured into a solid state to form a brush wheel with a compressive stress meeting the expectation under the condition of a predetermined compression ratio, wherein, as shown in fig. 4 to 6, any two adjacent air bubbles uniformly distributed in the PVA emulsion solution are communicated with each other to form a plurality of fluid channels on the brush wheel, and any two adjacent fluid channels are also communicated with each other and extend to the surface of the brush wheel to form pores to provide fluid F for circulation, thereby improving the fluid permeability (or porosity) of the brush wheel. Preferably, the pores formed in step S5 have an open-cell structure as shown in fig. 9, so that the brush wheel of the present invention has good fluid permeability (or porosity).
In addition, since the PVA emulsion solution contains the gaseous pore-filling agent in the form of bubbles and contains the bubbles, the bubbles distributed therein form pores through which a fluid can pass when the PVA emulsion solution is cured into a solid state, and thus, if the fluid permeability (or porosity) of the brush wheel is to be improved, it is possible to increase the amount of the gaseous pore-filling agent added.
As shown in fig. 10 and 11, the brush wheel mold 3 of the present invention is used for filling the PVA emulsion solution L to manufacture the brush wheel 1, and the brush wheel mold 3 of the present invention includes a mold cavity 31, and the mold cavity 31 includes a brush body forming portion 311 for forming the brush body 12 and a side support body forming portion 312 for forming the side support body 13. Preferably, the side supporting body forming portion 311 has an auxiliary exhausting structure 3111, such as a guiding slope, when the PVA emulsified solution L is being filled in, the auxiliary exhausting structure 3111 is located at a side of the brush body forming portion to guide the previous gas G to leave the mold cavity 31 in a direction of an arrow shown in fig. 11, so as to assist in removing the previous gas G originally existing in the mold cavity 31, thereby preventing the previous gas G from remaining in the mold cavity 31 and further entering the PVA emulsified solution, and preventing pores of the manufactured brush wheel from being unevenly distributed.
It should be noted that, during the curing process of the PVA emulsion in the brush wheel mold, bubbles are often floated and gathered in a local area of the PVA emulsion under the influence of buoyancy, which causes the bubbles in the PVA emulsion to be unevenly distributed, and thus, physical properties such as fluid permeability (or Porosity) of each part of the brush wheel finished product and compressive stress under a predetermined compression ratio may be different, which may affect the subsequent cleaning of the circuit substrate. In contrast, in the present invention, during the curing process of the PVA emulsion solution containing bubbles in the brush wheel mold, the brush wheel mold is rotated to change the floating direction of the bubbles in the PVA emulsion solution at a proper time, so that the range of the allowable floating area of the bubbles in the PVA emulsion solution is reduced, and thus, the distribution of the bubbles in the PVA emulsion solution is approximately uniform, and the fluid penetrability (or Porosity) of each part of the brush wheel finished product and the physical properties such as compression stress under the condition of a predetermined compression ratio tend to be consistent, thereby meeting the requirement of scrubbing the circuit substrate.
In addition, in the present invention, the weight percentage of the catalyst in the PVA emulsion solution may be selected from 1.5% to 5%; the weight percentage of the surfactant in the PVA emulsion solution can be selected from 0.4% to 1.4%; the weight percentage of the cross-linking agent in the PVA emulsified solution can be selected to be between 3% and 9%; the volume ratio of the gaseous pore filling agent in the PVA emulsified solution can be selected to be between 31% and 45%; the curing temperature of the PVA emulsion is between 42 ℃ and 65 ℃; in this way, the fluid permeability (or porosity) of the brush wheel is matched to the physical properties such as compressive stress under the condition of a predetermined compression ratio.
In the present invention, the compressive stress of the brush wheel has a suitable interval value between an upper limit value and a lower limit value, and according to the Test of ASTM (Standard Test Methods for Flexible Cellular materials), the lower limit value of the suitable interval value of the compressive stress should be 60psi and the upper limit value of the suitable interval value of the compressive stress should be 100psi under the condition that the predetermined compression ratio is 30%. It should be noted that when the compressive stress of the brush wheel under the condition of the predetermined compression ratio is higher than the lower limit value, the brushing efficiency of the circuit substrate can be made to meet the expectation, and when the compressive stress of the brush wheel under the condition of the predetermined compression ratio is lower than the upper limit value, the circuit substrate can be prevented from being damaged in the brushing process. In order to make the compression stress of the brush wheel under the condition of a preset compression ratio accord with the proper interval value of the compression stress, part of manufacturing parameters of the brush wheel manufacturing method are selected as follows: the weight percentage of the PVA material in the PVA emulsion solution is between 6 and 18 percent, the weight percentage of the cross-linking agent in the PVA emulsion solution is between 3 and 9 percent, the weight percentage of the catalyst in the PVA emulsion solution is between 1.3 and 5 percent, the volume ratio of the gaseous pore-filling agent in the PVA emulsion solution is between 20 and 50 percent, and the curing temperature of the PVA emulsion solution is between 42 and 65 ℃.
In the present invention, the proper porosity of the brush wheel of the present invention is determined by the experiment according to the astm (standard Test Method for determining the value of the porosity and Pore Volume Distribution of Soil and Rock by Mercury Intrusion porosimetry), and the value determined by the Mercury Intrusion instrument is between 88% and 95%, so that the fluid permeability of the brush wheel is in accordance with the expected passing of the brushing liquid to provide the effect of brushing the circuit substrate, therefore, the brush wheel of the present invention can effectively complete the brushing of the circuit substrate, and in order to make the porosity of the brush wheel in accordance with the proper porosity, part of the manufacturing parameters of the manufacturing Method of the present invention are selected as follows: the PVA material accounts for 8-20 wt% of the PVA emulsion solution, the cross-linking agent accounts for 3-10 wt% of the PVA emulsion solution, the surfactant accounts for 0.4-1.4 wt% of the PVA emulsion solution, the catalyst accounts for 1.5-8 wt% of the PVA emulsion solution, the gaseous pore-filling agent accounts for 31-45 vol% of the PVA emulsion solution, and the PVA emulsion solution is cured at a temperature of 40-70 ℃.
Therefore, in order to meet the above-mentioned appropriate values of porosity and compressive stress, part of the manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of the PVA material in the PVA emulsion solution is between 8% and 18%, the weight percentage of the cross-linking agent in the PVA emulsion solution is between 3% and 9%, the weight percentage of the surfactant in the PVA emulsion solution is between 0.4% and 1.4%, the weight percentage of the catalyst in the PVA emulsion solution is between 1.5% and 5%, the volume ratio of the gaseous pore-filling agent in the PVA emulsion solution is between 31% and 45%, and the curing temperature of the PVA emulsion solution is between 42 ℃ and 65 ℃.
In order to make the technical idea of the present invention clear, the following description is given by way of specific embodiments, so that those skilled in the art can easily understand the advantages and effects of the present invention.
In one embodiment of the present invention, some of the manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of the PVA material in the PVA emulsion solution is 8%, the weight percentage of the cross-linking agent in the PVA emulsion solution is 3%, the weight percentage of the catalyst in the PVA emulsion solution is 1.5%, the weight percentage of the surfactant in the PVA emulsion solution is 1.4%, the volume ratio of the gaseous pore-filling agent in the PVA emulsion solution is 45%, and the curing temperature of the PVA emulsion solution is 42 ℃, so that the manufactured brush wheel has the porosity of 94% and the compressive stress of 62psi under the condition of the compression ratio of 30% in the test of ASTM specification, thereby simultaneously meeting the appropriate interval value of the porosity and the compressive stress under the condition of the preset compression ratio.
In another embodiment of the present invention, some of the manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of the PVA material in the PVA emulsion solution is 18%, the weight percentage of the cross-linking agent in the PVA emulsion solution is 9%, the weight percentage of the catalyst in the PVA emulsion solution is 5%, the weight percentage of the surfactant in the PVA emulsion solution is 0.4%, the volume percentage of the gaseous pore-filling agent in the PVA emulsion solution is 31%, and the curing temperature of the PVA emulsion solution is 65 ℃, so that the manufactured brush wheel has the compressive stress of 97psi under the conditions that the porosity is 88% and the compression ratio is 30% in an ASTM specification experiment, thereby simultaneously meeting the appropriate interval value of the porosity and the compressive stress.
Therefore, in the test of ASTM specification, the higher the volume ratio of the gaseous pore-filling agent in the PVA emulsion solution, the higher the porosity of the brush wheel, and thus, the higher the fluid penetration of the brush wheel and the lower the compressive stress under the condition of the predetermined compression ratio, in this case, if the compressive stress under the condition of the predetermined compression ratio is lower than the above upper limit value, the damage to the circuit substrate during the brushing process can be avoided. In other words, the porosity of the brush wheel can be decreased by decreasing the volume ratio of the gaseous pore-filling agent in the PVA emulsion solution, so that the value of the compressive stress of the brush wheel under the condition of the predetermined compression ratio can be increased, and in this case, if the compressive stress under the condition of the predetermined compression ratio is higher than the lower limit value and meets the appropriate interval value of the compressive stress, the brushing efficiency of the brush wheel on the circuit substrate can be met.
In addition, the higher the weight percentage of the PVA material in the PVA emulsion solution, the lower the porosity of the brush wheel and the higher the compressive stress under the condition of the predetermined compression ratio, and at this time, if the compressive stress under the condition of the predetermined compression ratio is higher than the lower limit value and meets the proper interval value of the compressive stress, the brushing efficiency of the brush wheel on the circuit substrate is in accordance with the expectation. In other words, the porosity of the brush wheel can be made higher and the compressive stress under the condition of the predetermined compression ratio can be made lower by making the weight percentage of the PVA material in the PVA emulsion solution lower, and in this case, if the compressive stress under the condition of the predetermined compression ratio is lower than the above upper limit value, the circuit substrate can be prevented from being damaged during the brushing process.
In addition, the higher the weight percentage of the catalyst in the PVA emulsion solution, the faster the cross-linking reaction of the PVA material in the PVA aqueous solution, the lower the porosity of the brush wheel and the higher the compressive stress under the condition of the predetermined compression ratio, and at this time, if the compressive stress under the condition of the predetermined compression ratio is higher than the lower limit value and meets the appropriate range value of the compressive stress, the brushing efficiency of the brush wheel on the circuit substrate is expected. In other words, the porosity of the brush wheel can be increased and the compressive stress under the condition of the predetermined compression ratio can be decreased by decreasing the weight percentage of the catalyst in the PVA emulsion solution, and in this case, if the compressive stress under the condition of the predetermined compression ratio is lower than the above upper limit value, the circuit substrate can be prevented from being damaged during the brushing process.
In addition, the higher the curing temperature of the PVA emulsion solution is, the lower the porosity of the brush wheel is and the higher the compressive stress under the condition of the predetermined compression ratio is, and at this time, if the compressive stress under the condition of the predetermined compression ratio is higher than the lower limit value and meets the appropriate interval value of the compressive stress, the brushing efficiency of the brush wheel on the circuit substrate is made to meet the expectation. In other words, the higher the porosity of the brush wheel and the lower the compressive stress under the condition of the predetermined compression ratio can be made by lowering the aging temperature of the PVA emulsion solution, and in this case, if the compressive stress under the condition of the predetermined compression ratio is lower than the above upper limit value, the circuit board can be prevented from being damaged during the brush cleaning process.
Referring to the drawings of fig. 2 to 8, as shown in the drawings, the surface of the brush wheel 1 has a plurality of brush blocks 11 for brushing the circuit substrate 2, and as shown in fig. 3 to 4, when brushing the circuit substrate 2, the brush blocks 11 of the finished brush wheel 1 need to contact the surface to be brushed 21 on the circuit substrate 2, and then the brush wheel 1 is driven to rotate, and at this time, the brush blocks 11 brush the contacted circuit substrate 2.
Since the brush block 11 is easily deformed by force during the brushing process, the contact area with the circuit substrate 2 is reduced, and the brushing efficiency of the brush block 11 on the circuit substrate 2 is affected. In contrast, in the present invention, as shown in fig. 7, the brush block 11 has a brush body 12 and at least one side support 13, wherein the side support 13 is coupled to a side of the brush body 12 to provide lateral support for the brush body 12, so as to reduce the lateral deformation of the brush body 12 caused by a force when the brush block 11 brushes the circuit substrate 2, thereby ensuring that the brush block 11 contacts the circuit substrate 2 in a brushing process as expected.
As shown in fig. 7, the brush block 11 has two side supporters 13 respectively disposed on the left and right sides of the brush body 12 to provide lateral support for the brush body 12 on the left and right sides of the brush body 12, but not limited thereto, for example, one side supporter may be selectively disposed to extend along the side of the brush body to form a ring, and as shown in fig. 8, the side supporters 13 may be selectively disposed on the four sides of the brush body 12.
Preferably, as shown in fig. 8, the side support 13 is a triangular column, wherein when the brush block 11 brushes the circuit board 2, the brush body 12 will be subjected to a shearing force, and the side support 13 of the triangular column will provide a side support for the brush body 12.
In summary, the present invention provides a brush wheel, a method for manufacturing the same, and a brush wheel mold, wherein a gaseous pore-filling agent is mainly used to make the PVA emulsion contain air bubbles, and then the PVA emulsion containing air bubbles is placed into the brush wheel mold for curing, so as to form a brush wheel with pores inside. Therefore, the physical characteristics of the manufactured brush wheel meet the requirement of brushing the circuit substrate, and the problems caused by the use of the brush wheel due to the residues of the solid pore filling agent in the traditional brush wheel manufactured by using the foaming mode of using the solid pore filling agent are solved.
In addition, any two adjacent fluid channels in the brush wheel can be communicated and extend to the surface of the brush wheel to form pores for fluid circulation, so that the brush wheel has excellent fluid penetrability, and in the manufacturing method of the brush wheel, after the PVA emulsion is cured, the compression stress under the condition of the preset compression ratio can be formed to be in accordance with the expected brush wheel, so that the brush wheel can be used for brushing the circuit substrate. Moreover, the brush block of the brush wheel is provided with the side support body which can provide lateral support so as to reduce the degree of stress deformation of the brush block, thereby enabling the brush block to effectively contact the circuit substrate in the process of brushing the circuit substrate.
Claims (15)
1. A method of manufacturing a brush wheel, for manufacturing a brush wheel, the method comprising the steps of:
preparing a PVA material, a cross-linking agent, a gaseous pore-filling agent and a brush wheel mould;
dissolving the PVA material in water to form a PVA aqueous solution;
adding the cross-linking agent into the PVA aqueous solution to enable the PVA material in the PVA aqueous solution to carry out cross-linking reaction to form a PVA cross-linking solution;
adding the gaseous pore filling agent into the PVA cross-linking solution, and stirring to uniformly mix the gaseous pore filling agent and the PVA cross-linking solution to form a PVA emulsion solution, wherein bubbles formed by the gaseous pore filling agent are uniformly distributed in the PVA emulsion solution; and
and placing the PVA emulsified solution into the brush wheel mould for curing until the PVA emulsified solution is cured into a solid state to form the brush wheel with the compressive stress meeting the expectation under the condition of a preset compression ratio, wherein any two adjacent air bubbles uniformly distributed in the PVA emulsified solution are communicated to form a plurality of fluid channels on the brush wheel, and any two adjacent fluid channels are also communicated and extend to the surface of the brush wheel to form pores for fluid circulation.
2. The brush wheel manufacturing method according to claim 1, further comprising: preparing a catalyst, and adding the catalyst during the formation of the PVA crosslinking solution or the PVA emulsifying solution, so that the PVA crosslinking solution or the PVA emulsifying solution contains the catalyst for catalyzing the crosslinking reaction, wherein the weight percentage of the catalyst in the PVA emulsifying solution is between 1.5 and 5 percent; the catalyst comprises at least one member selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.
3. The brush wheel manufacturing method according to claim 1, further comprising: preparing a surfactant, and adding the surfactant in the formation process of the PVA crosslinking solution or the PVA emulsifying solution, so that the PVA crosslinking solution or the PVA emulsifying solution contains the surfactant, thereby maintaining the state of air bubbles in the PVA emulsifying solution, wherein the weight percentage of the surfactant in the PVA emulsifying solution is between 0.4 and 1.4 percent; the surfactant comprises at least one member selected from the group consisting of diglycerol polypropylene glycol ether, polyoxyethylene stearate, polyethylene glycol octyl phenyl ether, and sodium alkyl benzene sulfonate.
4. The method for manufacturing a brush wheel according to claim 1, wherein the weight percentage of the cross-linking agent in the PVA emulsified solution is between 3% and 9%; the crosslinking agent comprises at least one member selected from the group consisting of formaldehyde, acetaldehyde, glyoxal, propionaldehyde, butyraldehyde, succinaldehyde, and glutaraldehyde.
5. The method of claim 1, wherein the gaseous pore-filling agent is present in the PVA emulsion solution in a volume ratio of 31% to 45%.
6. The method for manufacturing a brush wheel according to claim 1, wherein the aging temperature of the PVA emulsion is between 42 ℃ and 65 ℃.
7. The method of claim 1, wherein during the aging of the PVA emulsion solution in the brush wheel mold, the brush wheel mold is rotated to reduce the floating area of the bubbles of the PVA emulsion solution, thereby maintaining a uniform distribution of the bubbles in the PVA emulsion solution.
8. A brush wheel produced by the method of claim 1.
9. A brush wheel according to claim 8, wherein the surface of the brush wheel has a plurality of brush blocks, each brush block having a brush body and at least one side support associated with and located laterally to the brush body to provide lateral support to the brush body.
10. The brush wheel according to claim 9, wherein the side support is a side support extending along a side edge of the brush body to form a ring shape.
11. The brush wheel according to claim 9, wherein the side supporting body is two side supporting bodies, and the two side supporting bodies are respectively positioned at the left side and the right side of the brush body.
12. The brush wheel according to claim 9, wherein the side supports are four side supports, and the four side supports are respectively located at four sides of the brush body.
13. The brush wheel according to claim 9, wherein the side support is a triangular prism.
14. A brush wheel mold for inserting the PVA emulsion solution to manufacture the brush wheel of claim 8, the brush wheel mold comprising:
the die cavity is provided with a brush body forming part and a side support body forming part, the brush body forming part is used for forming the brush body, and the side support body forming part is used for forming the side support body; wherein the content of the first and second substances,
the side support body forming part is provided with an auxiliary exhaust structure, when the side support body forming part is placed in the PVA emulsified solution process, the auxiliary exhaust structure is positioned at the side edge of the brush body forming part, and the prior gas originally existing in the die cavity is removed in an auxiliary mode, so that the condition that the prior gas is remained in the die cavity to cause the non-uniform distribution of the pores of the brush wheel is avoided.
15. The brush wheel mold of claim 14, wherein the auxiliary venting feature is a guide ramp that guides the precursor gas away from the mold cavity to assist in venting the precursor gas.
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| CN202011141037.8A CN114378988A (en) | 2020-10-22 | 2020-10-22 | Brush wheel, manufacturing method thereof and brush wheel die |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030005537A1 (en) * | 1996-11-08 | 2003-01-09 | Kanebo, Ltd. | Cleaning sponge roller |
| CN1863645A (en) * | 2003-08-08 | 2006-11-15 | 安格斯公司 | Methods and materials for making a monolithic porous pad cast onto a rotatable base |
| CN110335837A (en) * | 2019-07-05 | 2019-10-15 | 北京理工大学 | A kind of semiconductor crystal wafer cleaning preparation method of porous hydrophilic material and component |
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2020
- 2020-10-22 CN CN202011141037.8A patent/CN114378988A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030005537A1 (en) * | 1996-11-08 | 2003-01-09 | Kanebo, Ltd. | Cleaning sponge roller |
| CN1863645A (en) * | 2003-08-08 | 2006-11-15 | 安格斯公司 | Methods and materials for making a monolithic porous pad cast onto a rotatable base |
| CN110335837A (en) * | 2019-07-05 | 2019-10-15 | 北京理工大学 | A kind of semiconductor crystal wafer cleaning preparation method of porous hydrophilic material and component |
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