Brush wheel, manufacturing method thereof and brush wheel mold

Abstract

The present invention provides a brush wheel and a manufacturing method thereof and a brush wheel mold. The brush wheel is manufactured by foaming a gaseous pore-filling agent, thereby solving the problem of the existing method of manufacturing the brush wheel by foaming a solid pore-filling agent, in which the brush wheel has residues derived from the solid pore-filling agent inside. In addition, the brush wheel of the present invention has a plurality of fluid channels that are connected between any two adjacent ones, and the plurality of fluid channels extend to the surface of the brush wheel respectively, thereby forming pores to improve the fluid permeability of the brush wheel. In the brush wheel manufacturing method of the present invention, after maturation of the PVA emulsified solution, a brush wheel having a compression stress that meets the expected condition under a predetermined compression ratio can be formed, so that it can be used to scrub circuit substrates.

Description

Technical Field

[0001] The invention relates to a brush wheel and a manufacturing method thereof and a brush wheel mold, and more particularly to a brush wheel for scrubbing a circuit substrate and a manufacturing method thereof and a brush wheel mold. Background Art

[0002] In the electronics industry, brush wheels are often used to scrub pollutants remaining on the surface of circuit boards. At present, the manufacture of brush wheels usually requires the addition of solid pore-filling agents for foaming so that the physical properties of the manufactured brush wheels meet the requirements. Starch, calcium carbonate, sodium bicarbonate, magnesium silicate, barite powder, quartz powder, gypsum powder, diatomaceous earth, kaolin, rosin and glass powder and other solid materials can be used as solid pore-filling agents, and starch is the most commonly used solid pore-filling agent.

[0003] However, the solid hole filler is not easy to remove from the finished brush wheel and there is a problem of residue. As a result, the brush wheel currently used for scrubbing circuit substrates often has poor fluid penetration due to the internal pores being blocked by the solid hole filler, making it difficult for the scrubbing liquid to pass through, making the scrubbing efficiency of the circuit substrate not as expected. In addition, the solid hole filler residue on the brush wheel may fall off during the scrubbing process of the circuit substrate, and stick to the circuit substrate, thereby affecting the yield of the circuit substrate.

[0004] In addition, if the brush wheel uses starch as a solid pore filler, the residual solid pore filler (i.e. starch) is also prone to breed bacteria. In order to prevent the residual solid pore filler (i.e. starch) from breeding bacteria on the brush wheel, additives such as bactericides and antibacterial agents will be added to the brush wheel. However, these additives are also prone to remain on the brush wheel and affect the yield of the circuit substrate.

[0005] Furthermore, since the residue inside the brush wheel (i.e., solid hole filler) will affect the yield of the circuit substrate, the industry usually needs to perform a residue cleaning and removal procedure (several hours or even days) on the machine before using the brush wheel to scrub the circuit substrate, which leads to a decrease in the utilization rate of the production line equipment.

[0006] In view of this, how to solve the various problems caused by the residue inside the brush wheel due to the solid pore filling agent and the use of the brush wheel, is the technical issue to be solved in this case. Summary of the invention

[0007] In view of the shortcomings of the above-mentioned prior art, the present invention provides a brush wheel manufacturing method for manufacturing a brush wheel, the brush wheel manufacturing method comprising the following steps: preparing a PVA material, a cross-linking agent, a gaseous pore-filling agent and a brush wheel mold; dissolving the PVA material in water to form a PVA aqueous solution; adding a cross-linking agent to the PVA aqueous solution to cause the PVA material in the PVA aqueous solution to undergo a cross-linking reaction to form a PVA cross-linked solution; adding a gaseous pore-filling agent to the PVA cross-linked solution and stirring to mix the gaseous pore-filling agent and the PVA cross-linked solution evenly to form a PVA emulsified solution, the PVA emulsified solution containing uniformly distributed bubbles formed by the gaseous pore-filling agent; and placing the PVA emulsified solution in a brush wheel mold for maturation until the PVA emulsified solution is matured into a solid state to form a brush wheel whose compression stress under a predetermined compression ratio meets the expected conditions, at which time, any two adjacent bubbles uniformly distributed in the PVA emulsified solution will be connected to form a plurality of fluid channels on the brush wheel, and any two adjacent bubbles of the plurality of fluid channels will also be connected and extend to the surface of the brush wheel to form pores to provide fluid penetration.

[0008] Preferably, in the above-mentioned brush wheel manufacturing method, a catalyst is also prepared and added during the formation of the PVA cross-linking solution or the PVA emulsified solution, so that the PVA cross-linking solution or the PVA emulsified solution contains a catalyst, thereby being used to catalyze the cross-linking reaction, wherein the weight percentage of the catalyst in the PVA emulsified solution is between 1.5% and 5%; the catalyst contains at least one component selected from a group consisting of hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.

[0009] Preferably, in the above-mentioned brush wheel manufacturing method, a surfactant is also prepared and added during the formation of the PVA cross-linked solution or the PVA emulsified solution, so that the PVA cross-linked solution or the PVA emulsified solution contains the surfactant, thereby being used to maintain the bubble state in the PVA emulsified solution, wherein the weight percentage of the surfactant in the PVA emulsified solution is between 0.4% and 1.4%; the surfactant at least includes a component selected from a group consisting of diglycerol polypropylene glycol ether, polyoxyethylene stearate, polyethylene glycol octylphenyl ether and sodium alkylbenzene sulfonate.

[0010] Preferably, in the above-mentioned brush wheel manufacturing method, the weight percentage of the cross-linking agent in the PVA emulsified solution is between 3% and 9%; the cross-linking agent at least includes a component selected from a group consisting of formaldehyde, acetaldehyde, glyoxal, propionaldehyde, butyraldehyde, succinaldehyde and glutaraldehyde.

[0011] Preferably, in the brush wheel manufacturing method, the volume ratio of the gaseous pore-filling agent in the PVA emulsified solution is between 31% and 45%.

[0012] Preferably, in the brush wheel manufacturing method, the aging temperature of the PVA emulsified solution is between 42°C and 65°C.

[0013] Preferably, in the above-mentioned brush wheel manufacturing method, during the maturation process of the PVA emulsion solution in the brush wheel mold, the brush wheel mold will be rotated to reduce the floating area of ​​the bubbles of the PVA emulsion solution, so as to maintain a uniform distribution of the bubbles in the PVA emulsion solution.

[0014] Furthermore, the present invention also provides a brush wheel, which is manufactured by the above-mentioned brush wheel manufacturing method.

[0015] Preferably, in the above 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 body, the side support body is combined with the brush body and located on the side of the brush body to provide lateral support for the brush body.

[0016] Preferably, in the above brush wheel, the side support body is a side support body extending along the side of the brush body to form a ring shape.

[0017] Preferably, in the above brush wheel, the side supports are two side supports respectively located on the left and right sides of the brush body.

[0018] Preferably, in the above brush wheel, the side supports are four side supports respectively located on four sides of the brush body.

[0019] Preferably, in the above brush wheel, the side support body is a triangular columnar body.

[0020] In addition, the present invention also provides a brush wheel mold for placing a PVA emulsified solution to manufacture the above-mentioned brush wheel, wherein the brush wheel mold includes a mold cavity, wherein the mold cavity has a brush body molding portion for molding a brush body and a side support body molding portion for molding a side support body. The side support body molding portion has an auxiliary exhaust structure, and when the PVA emulsified solution is placed, the auxiliary exhaust structure is located on the side of the brush body molding portion to assist in removing the prior gas originally existing in the mold cavity, thereby avoiding the prior gas remaining in the mold cavity, which causes the pores of the manufactured brush wheel to be unevenly distributed.

[0021] Preferably, in the brush wheel mold, the auxiliary exhaust structure is a guide slope, which guides the prior gas to leave the mold cavity to assist in exhausting the prior gas.

[0022] Compared with the prior art, the brush wheel and its manufacturing method and brush wheel mold provided by the present invention use a gaseous pore-filling agent to foam a brush wheel containing pores to provide fluid penetration, thereby solving the problem of the existing brush wheel manufacturing method using a solid pore-filling agent to foam, which results from the presence of solid pore-filling agent residues inside the brush wheel. In addition, in the brush wheel manufacturing method of the present invention, after maturation, the PVA emulsified solution can form a brush wheel whose compression stress meets the expected conditions under a predetermined compression ratio, so that it can be used to scrub circuit substrates, and the brush wheel has a plurality of fluid channels connected to any two adjacent ones, and the plurality of fluid channels respectively extend to the surface of the brush wheel to form pores to provide fluid penetration. In this way, the brush wheel of the present invention has excellent fluid permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic flow chart of the brush wheel manufacturing method of the present invention.

[0024] Figure 2 Shown is a three-dimensional schematic diagram of an embodiment of the brush wheel of the present invention.

[0025] Figure 3 Display as Figure 2 Schematic diagram of the brush wheel in use.

[0026] Figure 4 It is a schematic diagram showing that any two adjacent fluid channels in the brush wheel of the present invention are connected and extend to the surface of the brush wheel to form pores to provide fluid penetration.

[0027] Figure 5 Display as Figure 4 A partial enlarged view of the area indicated by the symbol X.

[0028] Figure 6 Display as Figure 4 A local enlarged view of the area indicated by symbol Y.

[0029] Figure 7 A side view of a first embodiment of a brush block of a brush wheel of the present invention is shown.

[0030] Figure 8 A schematic top view of a second embodiment of a brush block of a brush wheel of the present invention is shown.

[0031] Fig. 9 Shown is a high-resolution image of the pores in the brush wheel of the present invention.

[0032] Fig.10 Shown is a partial schematic diagram of the mold cavity of the brush wheel mold of the present invention.

[0033] Fig.11 Display as Fig.10Schematic diagram of the brush wheel mold cavity expelling the initial gas during the process of placing the PVA emulsified solution.

[0034] Description of symbols

[0035] 1 Brush wheel

[0036] 11 Brush Block

[0037] 12 Brush Body

[0038] 13 side supports

[0039] 14 Fluid Channel

[0040] 2 Circuit board

[0041] 21 Face to be washed

[0042] 3 Brush wheel mold

[0043] 31 mold cavity

[0044] 311 Brush body forming unit

[0045] 3111 Auxiliary exhaust structure

[0046] 312 Side support body forming section

[0047] L PVA emulsified solution

[0048] G First gas

[0049] F Fluid DETAILED DESCRIPTION

[0050] The technical content of the present invention is described below through specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] The present invention provides a brush wheel and a manufacturing method thereof and a brush wheel mold. The manufactured brush wheel can be used for brushing circuit substrates such as semiconductor wafers. The brush wheel is mainly made by foaming a gaseous pore filling agent so that there is no residue inside the brush wheel and the physical properties meet the requirements of brushing circuit substrates.

[0052] Regarding the physical properties of the above-mentioned brush wheel, it is mainly because there are integrated circuits on the circuit substrate. In order to avoid damage to the circuit substrate during the brushing process, the physical properties of the fluid permeability (or porosity) of the brush wheel are strictly required, so that the brush wheel has sufficient pores to allow the brushing liquid to pass through, and the brushing liquid can provide an effect during the brushing process of the circuit substrate. In addition, the physical properties of the compressive stress of the brush wheel under the condition of a predetermined compression ratio will also be strictly required to comply with an appropriate interval value between an upper limit value and a lower limit value, because during the brushing process of the circuit substrate, if the compressive stress of the brush wheel under the condition of a predetermined compression ratio is less than the lower limit value of the appropriate interval, the brushing efficiency of the brush wheel on the circuit substrate will not be as expected. In addition, if the compressive stress of the brush wheel under the condition of a predetermined compression ratio is greater than the upper limit value of the appropriate interval, the brushing of the brush wheel will easily damage the circuit substrate.

[0053] For the technical ideas of this invention, please refer to Figures 1 to 11 of revelation.

[0054] like Figure 1 As shown, the manufacturing method of the brush wheel of the present invention mainly includes the following steps:

[0055] Step S1: prepare PVA material, cross-linking agent, gaseous pore filling agent and brush wheel mold.

[0056] It should be noted that the PVA material is polyvinyl alcohol (Polyvinyl Alcohol).

[0057] Step S2: dissolving the PVA material in water to form a PVA aqueous solution.

[0058] Step S3: adding a crosslinking agent to the PVA aqueous solution to cause the PVA material in the PVA aqueous solution to undergo a crosslinking reaction to form a PVA crosslinking solution.

[0059] It should be noted that the cross-linking agent may be selected to include at least one component selected from the group consisting of formaldehyde, acetaldehyde, glyoxal, propionaldehyde, butyraldehyde, succinaldehyde and glutaraldehyde, and in order to mix the PVA aqueous solution and the cross-linking agent evenly, the mixed solution of the PVA aqueous solution and the cross-linking agent may be stirred.

[0060] Preferably, in the brush wheel manufacturing method of the present invention, a catalyst can also be prepared and added during the formation of the PVA cross-linking solution or the PVA emulsified solution, so that the PVA cross-linking solution or the PVA emulsified solution contains a catalyst for catalyzing the cross-linking reaction, so that the formation of the PVA cross-linking solution meets expectations.

[0061] It should be noted that the catalyst may include at least one component selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.

[0062] Step S4: adding a gaseous pore-filling agent to the PVA cross-linking solution, and stirring to evenly mix the gaseous pore-filling agent and the PVA cross-linking solution to form a PVA emulsified solution, wherein the PVA emulsified solution contains uniformly distributed bubbles generated by the gaseous pore-filling agent.

[0063] It should be noted that in the present invention, the gaseous pore filling agent mainly forms bubbles in the PVA emulsified solution without participating in chemical reactions, so the gaseous pore filling agent can be selected as air, or at least includes a component selected from a group consisting of inert gases such as nitrogen and helium.

[0064] Preferably, in the brush wheel manufacturing method of the present invention, a surfactant can also be prepared and added during the formation of the PVA cross-linked solution or the PVA emulsified solution, so that the PVA cross-linked solution or the PVA emulsified solution contains a surfactant for maintaining the bubble state in the PVA emulsified solution.

[0065] It should be noted that the surfactant may include at least one component selected from the group consisting of diglycerol polypropylene glycol ether, polyoxyethylene stearate, polyethylene glycol octylphenyl ether and sodium alkylbenzene sulfonate.

[0066] Step S5: Place the PVA emulsified solution into the brush wheel mold for maturation until the PVA emulsified solution is matured into a solid state to form a brush wheel with a compression stress that meets the expected conditions under a predetermined compression ratio. Figures 4 to 6 As shown, any two adjacent bubbles uniformly distributed in the PVA emulsified solution will be connected to form multiple fluid channels on the brush wheel, and any two adjacent fluid channels will also be connected 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 the following characteristics: Fig. 9 The open-cell structure shown enables the brush wheel of the present invention to have good fluid permeability (or porosity).

[0067] In addition, since the PVA emulsion solution contains gaseous pore-filling agents in the form of bubbles, after the PVA emulsion solution matures into a solid state, the bubbles distributed therein will form pores through which fluid can pass. Therefore, if the fluid permeability (or porosity) of the brush wheel is to be improved, it can be achieved by increasing the amount of gaseous pore-filling agents added.

[0068] It should be noted that if Fig.10 and Fig.11As shown, the brush wheel mold 3 of the present invention is used to place the PVA emulsion solution L to manufacture the above-mentioned brush wheel 1. The brush wheel mold 3 of the present invention includes a mold cavity 31, and the mold cavity 31 has a brush body molding part 311 for molding the brush body 12, and a side support body molding part 312 for molding the side support body 13. Preferably, the side support body molding part 312 has an auxiliary exhaust structure 3111 such as a guiding slope. When the PVA emulsion solution L is placed, the auxiliary exhaust structure 3111 is located on the side of the brush body molding part to guide the first gas G toward Fig.11 The direction of the arrow shown is away from the mold cavity 31 to assist in removing the prior gas G originally present in the mold cavity 31, thereby preventing the prior gas G from remaining in the mold cavity 31 and then entering the PVA emulsified solution, thereby preventing the pores of the manufactured brush wheel from being unevenly distributed.

[0069] It should be noted that during the maturation of the PVA emulsion solution in the brush wheel mold, the bubbles are often affected by buoyancy and float and gather in local areas of the PVA emulsion solution, resulting in uneven distribution of bubbles in the PVA emulsion solution. This may cause differences in the fluid permeability (or porosity) of each part of the brush wheel and the physical properties such as compressive stress under a predetermined compression ratio, thereby affecting the subsequent scrubbing of the circuit substrate. In this regard, in the present invention, during the maturation of the PVA emulsion solution containing bubbles in the brush wheel mold, the brush wheel mold will be rotated to change the floating direction of the bubbles in the PVA emulsion solution in a timely manner, thereby reducing the allowable floating area of ​​the bubbles in the PVA emulsion solution. In this way, the distribution of bubbles in the PVA emulsion solution tends to be uniform, so that the fluid permeability (or porosity) of each part of the brush wheel and the physical properties such as compressive stress under a predetermined compression ratio tend to be consistent, thereby meeting the requirements for scrubbing the circuit substrate.

[0070] In addition, in the present invention, the weight percentage of the above-mentioned catalyst in the PVA emulsified solution can be selected to be between 1.5% and 5%; the weight percentage of the above-mentioned surfactant in the PVA emulsified solution can be selected to be between 0.4% and 1.4%; the weight percentage of the above-mentioned 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 aging temperature of the PVA emulsified solution is between 42°C and 65°C; in this way, the physical properties such as the fluid permeability (or porosity) of the brush wheel and the compressive stress under the conditions of a predetermined compression ratio meet appropriate values.

[0071] In the present invention, the compressive stress of the brush wheel has an appropriate interval value between an upper limit value and a lower limit value. According to the experiment of ASTM (Standard Test Methods for Flexible Cellular Materials), under the condition of a predetermined compression ratio of 30%, the lower limit value of the appropriate interval value of the compressive stress should be 60psi, and the upper limit value of the appropriate interval value of the compressive stress should be 100psi. It should be noted that when the compressive stress of the brush wheel under the condition of a predetermined compression ratio is higher than the lower limit value, the scrubbing efficiency of the circuit substrate can be made to meet expectations, and when the compressive stress of the brush wheel under the condition of a predetermined compression ratio is lower than the upper limit value, damage to the circuit substrate during the scrubbing process can be avoided. In order to make the compressive stress of the brush wheel under a predetermined compression ratio meet the appropriate range value of the above-mentioned compressive stress, some manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of PVA material in the PVA emulsified solution is between 6% and 18%, the weight percentage of the cross-linking agent in the PVA emulsified solution is between 3% and 9%, the weight percentage of the catalyst in the PVA emulsified solution is between 1.3% and 5%, the volume ratio of the gaseous pore filling agent in the PVA emulsified solution is between 20% and 50%, and the aging temperature of the PVA emulsified solution is between 42°C and 65°C.

[0072] In the present invention, the appropriate value of the porosity of the brush wheel of the present invention is based on ASTM (Standard Test Method for Determination of Pore Volume and Pore Volume Distribution of Soil and Rock by Mercury Intrusion In the experiment of Mercury Porosimetry (MPA), the value measured by the mercury intrusion instrument should be between 88% and 95%. In this way, the fluid permeability of the brush wheel can meet the expectation of allowing the brushing liquid to pass through to provide a brushing effect on the circuit substrate. Therefore, the brush wheel of the present invention can effectively complete the brushing of the circuit substrate. In order to make the porosity of the brush wheel meet the appropriate value of the above-mentioned porosity, some manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of PVA material in the PVA emulsified solution is between 8% and 20%, the weight percentage of the cross-linking agent in the PVA emulsified solution is between 3% and 10%, the weight percentage of the surfactant in the PVA emulsified solution is between 0.4% and 1.4%, the weight percentage of the catalyst in the PVA emulsified solution is between 1.5% and 8%, the volume ratio of the gaseous pore filling agent in the PVA emulsified solution is between 31% and 45%, and the aging temperature of the PVA emulsified solution is between 40°C and 70°C.

[0073] Therefore, in order to simultaneously meet the above-mentioned appropriate values ​​of porosity and compressive stress, some manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of PVA material in the PVA emulsified solution is between 8% and 18%, the weight percentage of the cross-linking agent in the PVA emulsified solution is between 3% and 9%, the weight percentage of the surfactant in the PVA emulsified solution is between 0.4% and 1.4%, the weight percentage of the catalyst in the PVA emulsified solution is between 1.5% and 5%, the volume ratio of the gaseous pore filling agent in the PVA emulsified solution needs to be between 31% and 45%, and the aging temperature of the PVA emulsified solution is between 42°C and 65°C.

[0074] In order to make the technical concept of the present invention clear, the following is described through specific embodiments so that people familiar with this technology can easily understand the advantages and effects of the present invention.

[0075] In one embodiment of the present invention, some manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of PVA material in the PVA emulsified solution is 8%, the weight percentage of the cross-linking agent in the PVA emulsified solution is 3%, the weight percentage of the catalyst in the PVA emulsified solution is 1.5%, the weight percentage of the surfactant in the PVA emulsified solution is 1.4%, the volume ratio of the gaseous pore filling agent in the PVA emulsified solution is 45%, and the aging temperature of the PVA emulsified solution is 42°C. In this way, the brush wheel manufactured has a porosity of 94% and a compression stress of 62psi under the conditions of a compression ratio of 30% in the ASTM standard experiment, thereby being able to simultaneously meet the above-mentioned appropriate interval values ​​of the porosity and the compressive stress under the conditions of a predetermined compression ratio.

[0076] In another embodiment of the present invention, some manufacturing parameters of the brush wheel manufacturing method of the present invention are selected as follows: the weight percentage of PVA material in the PVA emulsified solution is 18%, the weight percentage of the cross-linking agent in the PVA emulsified solution is 9%, the weight percentage of the catalyst in the PVA emulsified solution is 5%, the weight percentage of the surfactant in the PVA emulsified solution is 0.4%, the volume ratio of the gaseous pore filling agent in the PVA emulsified solution is 31%, and the aging temperature of the PVA emulsified solution is 65°C. In this way, the brush wheel manufactured has a porosity of 88% and a compression stress of 97psi under the conditions of a compression ratio of 30% in the ASTM standard experiment, thereby simultaneously meeting the above-mentioned appropriate range values ​​of porosity and compression stress.

[0077] Therefore, in the present invention, in the experiment of ASTM standard, the higher the volume ratio of the gaseous pore-filling agent in the PVA emulsified solution, the higher the porosity of the brush wheel. This will also cause the fluid permeability of the brush wheel to be higher and the compressive stress under the condition of a predetermined compression ratio to be lower. At this time, if the compressive stress under the condition of the predetermined compression ratio is lower than the above upper limit value, damage to the circuit substrate during the scrubbing process can be avoided. In other words, by reducing the volume ratio of the gaseous pore-filling agent in the PVA emulsified solution, the porosity of the brush wheel can be reduced and the value of the compressive stress of the brush wheel under the condition of a predetermined compression ratio can be increased. At this time, if the compressive stress under the condition of the predetermined compression ratio is higher than the above lower limit value and meets the appropriate interval value of the above compressive stress, the scrubbing efficiency of the brush wheel on the circuit substrate meets expectations.

[0078] In addition, the higher the weight percentage of the PVA material in the PVA emulsified solution, the lower the porosity of the brush wheel and the higher the compressive stress under the predetermined compression ratio. At this time, if the compressive stress under the predetermined compression ratio is higher than the above lower limit value, and meets the appropriate interval value of the above compressive stress, the brushing efficiency of the brush wheel on the circuit substrate meets expectations. In other words, the lower the weight percentage of the PVA material in the PVA emulsified solution, the higher the porosity of the brush wheel and the lower the compressive stress under the predetermined compression ratio. At this time, if the compressive stress under the predetermined compression ratio is lower than the above upper limit value, damage to the circuit substrate during the brushing process can be avoided.

[0079] In addition, the higher the weight percentage of the catalyst in the PVA emulsified solution, the faster the cross-linking reaction of the PVA material in the PVA aqueous solution, which will cause the porosity of the brush wheel to be lower and the compressive stress under the condition of a predetermined compression ratio to be higher. At this time, if the compressive stress under the condition of a predetermined compression ratio is higher than the above lower limit value and meets the appropriate interval value of the above compressive stress, the brushing efficiency of the brush wheel on the circuit substrate will meet expectations. In other words, the porosity of the brush wheel can be higher and the compressive stress under the condition of a predetermined compression ratio can be lowered by lowering the weight percentage of the catalyst in the PVA emulsified solution. At this time, if the compressive stress under the condition of a predetermined compression ratio is lower than the above upper limit value, damage to the circuit substrate during the brushing process can be avoided.

[0080] Furthermore, the higher the aging temperature of the PVA emulsion solution, the lower the porosity of the brush wheel and the higher the compressive stress under the condition of a predetermined compression ratio. At this time, if the compressive stress under the condition of a predetermined compression ratio is higher than the above lower limit value and meets the appropriate interval value of the above compressive stress, the brush wheel's scrubbing efficiency on the circuit substrate meets expectations. In other words, the aging temperature of the PVA emulsion solution can be lowered to make the porosity of the brush wheel higher and the compressive stress under the condition of a predetermined compression ratio lower. At this time, if the compressive stress under the condition of a predetermined compression ratio is lower than the above upper limit value, damage to the circuit substrate during the scrubbing process can be avoided.

[0081] For the brush wheel provided by the present invention, please refer to Figures 2 to 8 Schematic diagram of the embodiment, as shown in each figure, the surface of the brush wheel 1 has a plurality of brush blocks 11 for brushing the circuit substrate 2, such as Figure 3 to Figure 4 As shown, when scrubbing the circuit substrate 2, the brush block 11 of the brush wheel 1 needs to first contact the surface 21 to be scrubbed on the circuit substrate 2, and then the brush wheel 1 will be driven to rotate, at which time the brush block 11 will scrub the circuit substrate 2 in contact.

[0082] Since the brush block 11 is easily deformed by force during the scrubbing process, the contact area with the circuit substrate 2 is reduced, thereby affecting the scrubbing efficiency of the brush block 11 on the circuit substrate 2. Figure 7 As shown, the brush block 11 has a brush body 12 and at least one side support body 13, wherein the side support body 13 is combined with the side of the brush body 12 to provide lateral support for the brush body 12, thereby reducing the degree of lateral deformation of the brush body 12 due to force when the brush block 11 brushes the circuit substrate 2. In this way, it can be ensured that the contact of the brush block 11 with the circuit substrate 2 during the brushing process is in line with expectations.

[0083] like Figure 7 As shown, the brush block 11 has two side supports 13 respectively arranged on the left and right sides of the brush body 12 to provide lateral support to the brush body 12 on the left and right sides of the brush body 12, but it is not limited thereto. For example, one side support may be selected to extend along the side of the brush body to form a ring. In addition, as Figure 8 As shown, side supports 13 may also be provided on the four sides of the brush body 12 respectively.

[0084] Preferably, if Figure 8 As shown, the side support bodies 13 are triangular prism-shaped bodies. When the brush block 11 brushes the circuit substrate 2 , the brush body 12 will be subjected to shear force. At this time, the side support bodies 13 of the triangular prism-shaped bodies will provide lateral support for the brush body 12 .

[0085] In summary, the present invention provides a brush wheel and a manufacturing method thereof and a brush wheel mold, which mainly use a gaseous pore filling agent to make the PVA emulsified solution contain bubbles, and then put the PVA emulsified solution containing bubbles into the brush wheel mold for maturation to form a brush wheel with pores inside. In this way, the physical properties of the manufactured brush wheel meet the requirements of brushing circuit substrates, and solve the various problems caused by the use of the brush wheel made by the existing solid pore filling agent foaming method because there are residues of the solid pore filling agent inside.

[0086] In addition, any two adjacent ones of the multiple fluid channels inside the brush wheel of the present invention can be connected and extend to the surface of the brush wheel to form pores to provide fluid circulation, so that the brush wheel of the present invention has excellent fluid permeability, and in the brush wheel manufacturing method of the present invention, the PVA emulsified solution can form a brush wheel with a compression stress that meets the expected conditions under a predetermined compression ratio after maturation, so that it can be used for brushing circuit substrates. Furthermore, the brush block of the brush wheel of the present invention has a side support body that can provide lateral support to reduce the degree of deformation of the brush block under stress, so that the brush block can effectively contact the circuit substrate during the process of brushing the circuit substrate.

Claims

1. A brush wheel manufacturing method, characterized in that: Used to manufacture a brush wheel, the brush wheel manufacturing method comprises the following steps: Prepare a PVA material, a cross-linking agent, a gaseous pore-filling agent and a brush wheel mold; Dissolving the PVA material in water to form a PVA aqueous solution; Adding the cross-linking agent into the PVA aqueous solution to make the PVA material in the PVA aqueous solution undergo a cross-linking reaction to form a PVA cross-linking solution; Adding the gaseous pore-filling agent to 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 emulsified solution, wherein the PVA emulsified solution contains uniformly distributed bubbles formed by the gaseous pore-filling agent; and Put the PVA emulsion solution into the brush wheel mold and ripen it until the PVA emulsion solution is ripened into a solid state to form the brush wheel. At this time, any two adjacent bubbles evenly distributed in the PVA emulsion solution will be connected to form a plurality of fluid channels on the brush wheel, and any two adjacent bubbles of the plurality of fluid channels will also be connected and extend to the surface of the brush wheel to form pores to provide fluid circulation; and During the maturation process of the PVA emulsified solution in the brush wheel mold, the brush wheel mold is rotated to reduce the floating area of ​​the bubbles of the PVA emulsified solution, so that the bubbles in the PVA emulsified solution can maintain a uniform distribution.

2. The brush wheel manufacturing method according to claim 1, characterized in that: Also includes: A catalyst is prepared and added during the formation of the PVA cross-linking solution or the PVA emulsified solution, so that the PVA cross-linking solution or the PVA emulsified solution contains the catalyst, thereby catalyzing the cross-linking reaction, wherein the weight percentage of the catalyst in the PVA emulsified solution is between 1.5% and 5%; and the catalyst contains at least one component selected from a group consisting of hydrochloric acid, sulfuric acid, phosphoric acid and nitric acid.

3. The brush wheel manufacturing method according to claim 1, characterized in that: Also includes: A surfactant is prepared and added during the formation of the PVA cross-linked solution or the PVA emulsified solution, so that the PVA cross-linked solution or the PVA emulsified solution contains the surfactant, thereby maintaining the bubble state in the PVA emulsified solution, wherein the weight percentage of the surfactant in the PVA emulsified solution is between 0.4% and 1.4%; the surfactant at least includes a component selected from a group consisting of diglycerol polypropylene glycol ether, stearic acid polyoxyethylene ester, polyethylene glycol octyl phenyl ether and sodium alkylbenzene sulfonate.

4. The brush wheel manufacturing method according to claim 1, characterized in that: The weight percentage of the crosslinking agent in the PVA emulsified solution is between 3% and 9%; the crosslinking agent at least comprises a component selected from a group consisting of formaldehyde, acetaldehyde, glyoxal, propionaldehyde, butyraldehyde, succinaldehyde and glutaraldehyde.

5. The brush wheel manufacturing method according to claim 1, characterized in that: The volume ratio of the gaseous pore-filling agent in the PVA emulsified solution is between 31% and 45%.

6. The brush wheel manufacturing method according to claim 1, characterized in that: The aging temperature of the PVA emulsified solution is between 42°C and 65°C.

7. A brush wheel, characterized in that: The brush wheel is manufactured by the brush wheel manufacturing method as claimed in claim 1.

8. The brush wheel according to claim 7, characterized in that: The surface of the brush wheel is provided with a plurality of brush blocks, each of which has a brush body and at least one side support body, wherein the side support body is combined with the brush body and is located at the side of the brush body to provide lateral support for the brush body.

9. The brush wheel according to claim 8, characterized in that: The side support body is one side support body, and the one side support body extends along the side edge of the brush body to form a ring shape.

10. The brush wheel according to claim 8, characterized in that: The side support bodies are two side support bodies, and the two side support bodies are respectively located at the left and right sides of the brush body.

11. The brush wheel according to claim 8, characterized in that: The side support bodies are four side support bodies, and the four side support bodies are respectively located at four sides of the brush body.

12. The brush wheel according to claim 8, characterized in that: The side support body is a triangular columnar body.

13. A brush wheel mold, characterized in that: Used to place the PVA emulsified solution, so as to manufacture the brush wheel as claimed in claim 7, the brush wheel mold comprises: A mold cavity, the mold cavity has a brush body forming part and a side support body forming part, the brush body forming part is used to form the brush body, and the side support body forming part is used to form the side support body; wherein, The side support body forming part has an auxiliary exhaust structure. When the PVA emulsified solution is placed, the auxiliary exhaust structure is located on the side of the brush body forming part to assist in removing the prior gas originally existing in the mold cavity, thereby avoiding the prior gas from remaining in the mold cavity and causing the pores of the manufactured brush wheel to be unevenly distributed.

14. The brush wheel mold according to claim 13, characterized in that: The auxiliary exhaust structure is a guide slope, and the guide slope guides the preceding gas to leave the mold cavity to assist in exhausting the preceding gas.

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