KR100828627B1 - r preparing polyurethane pad grasping an object for polishing - Google Patents

Abstract

The present invention discloses a polyurethane pad for gripping a polished object and a method for manufacturing the same, wherein a polyurethane resin is coated by applying a dimethylformamide mixed solution of a polyurethane resin to one surface of a base sheet selected from a synthetic resin film, polyester and nylon fabric Form a coating layer, solidify and dehydrate the coating layer After drying, it is separated from the base sheet, and the surface separated from the base sheet is polished to open micropores, and then the synthetic resin sheet is bonded and cut to the polishing surface. According to this configuration, since the size and distribution of the pores formed inside the tissue is uniform, excellent cushioning and adsorption force is provided, it is possible to provide a polyurethane pad having an excellent abrasive holding force.

Gripping pad, suction pad, polyurethane pad (sheet)

Description

   Polyurethane pad for gripping a polished object and a method for manufacturing the same {r preparing polyurethane pad grasping an object for polishing}

1 is a schematic cross-sectional view showing a polyurethane pad for gripping a workpiece according to the present invention;

Figure 2a to 2c is a schematic cross-sectional view shown for explaining the process of forming a polyurethane pad for polishing the abrasive according to the present invention,

3A to 3E are scanning electron microscope (SEM) organization charts of polyurethane pads for gripping a polished body according to the present invention, respectively;

Figure 4 is a schematic view showing for explaining the manufacturing process of the polyurethane pad for gripping the abrasive according to the present invention,

Figure 5 and Figure 6 is a schematic view showing for explaining the manufacturing process of the polyurethane pad for gripping the abrasive according to another embodiment of the present invention, respectively.

<Description of the symbols for the main parts of the drawings>

100 ... base sheet 101 ... support synthetic resin film

102 ... Paper synthetic film 110C ... Polyurethane resin coating layer

110S ... Polyurethane Sheet 110P ... Polyurethane Pad

111.Separation surface 111G ... Polishing surface

112 ... (coating layer) Top 113 ... Micropore

G ... grinder B ... adhesive

The present invention relates to a pad for gripping a workpiece, and more particularly, to a polyurethane pad for gripping a workpiece to be gripped to enable precise grinding of a polished surface requiring a fine surface, and a manufacturing method thereof. .

For example, an object to be polished that requires a fine and precise surface, such as a glass substrate for a liquid crystal panel (LCD), is set in a fixed state on a suction pad to maintain a constant position and posture during a process for precision polishing.

However, in the case of the conventional polishing pad for gripping, the size and distribution of the cells formed inside the pad are not uniform, so that the cushioning and adsorptive force on the polishing target are reduced, and thus the polishing target is polished on the pad. The sieve flows easily and has a problem of deterioration in polishing quality.

In addition, the conventional abrasive pad for gripping the abrasive is not only the bubble generation inside the sheet or the size of the bubble is not uniform, the adsorption power to the abrasive is reduced, as well as the abrasive is easily removed due to the water repellent deterioration There is a problem that the quality is degraded.

The present invention was created in order to improve this in consideration of the problems of the conventional abrasive pad for gripping the above-described, the object of the present invention is improved cushioning so that the gripping force on the abrasive is more improved To provide a gripping polyurethane pad and a method of manufacturing the same.

Polyurethane pad for polishing the abrasive according to the present invention for achieving the object as described above, by applying a dimethylformamide mixture of polyurethane resin to one surface of any one of the base sheet selected from a synthetic resin film, polyester and nylon fabric After forming a polyurethane resin coating layer, the coating layer is solidified, washed, dehydrated and dried, and then separated from the base sheet to polish the separated surface to open a plurality of fine pores, and then pad the surface. It is made by gluing the synthetic resin film, the dimethylformamide mixed solution of the polyurethane resin, 30 to 120 parts by weight of dimethylformamide with respect to 100 parts by weight of polyurethane resin; 0.5-15 weight part of succinic acid which is an anionic surfactant; 3.0-12.0 parts by weight of a nonionic surfactant composed of a mixture of silicone oil and polyol; Fillers from 2.0 to 10.0 parts by weight; 2.0-15.0 parts by weight of a dye preparation comprising a mixture of a color pigment and dimethylformamide; The aqueous solution of calcium chloride having a concentration of 50% and 0.3 ~ 3.0 parts by weight of any one of the water repellent selected from fluorine resin, paraffin chloride and silicone oil; uniformly mixed to dissolve.

According to the present invention, the coating layer preferably has a density ranging from 0.15 g / cm 3 to 0.35 g / cm 3 after being solidified, washed, dehydrated, and dried.

The base sheet preferably has a thickness of 0.1 mm to 2.0 mm. In addition, the pad synthetic resin film preferably has a thickness of 0.10mm ~ 0.50mm range.

According to the present invention, there is provided a method for producing a polyurethane pad for gripping a polishing object according to the present invention for achieving the above object, on the surface of a base sheet selected from a synthetic resin film, a polyester and a nylon fabric, based on 100 parts by weight of a polyurethane resin, Dimethylformamide 30 to 120 parts by weight; 0.5-15 weight part of succinic acid which is an anionic surfactant; 3.0-12.0 parts by weight of a nonionic surfactant composed of a mixture of silicone oil and polyol; Fillers from 2.0 to 10.0 parts by weight; 2.0-15.0 parts by weight of a dye preparation comprising a mixture of a color pigment and dimethylformamide; A coating step of forming a polyurethane resin coating layer by coating a dissolved polyurethane resin mixture by uniformly mixing a 50% calcium chloride aqueous solution having a concentration of 50% and a water repellent agent selected from fluorine resin, paraffin chloride, and silicone oil; ; A solidification step of solidifying the polyurethane resin coating layer by immersing the base sheet on which the coating layer is formed in the coating step in an aqueous dimethylformamide solution; A water washing step of continuously squeezing the base sheet and the coating layer which have undergone the solidification step by a squeegee roll while immersing it in a washing tank; A dewatering step of continuously compressing and dehydrating the base sheet and the coating layer which have undergone the washing step by a squeegee roll; A drying step of drying the base sheet and the coating layer which have undergone the dehydration step; A coating layer separation step of obtaining a polyurethane sheet by separating the coating layer from the base sheet subjected to the drying step in a chic form; Polishing the separation surface of the polyurethane sheet formed by separating the coating layer from the base sheet; A pad film bonding step of adhering the pad synthetic resin film to the polishing surface of the polyurethane sheet; And a pad cutting step of cutting the polyurethane sheet and the synthetic resin film for a pad to a predetermined standard.

According to the present invention, in the solidification step, the base sheet is immersed in an aqueous solution of 3-15% dimethylformamide in a concentration inside the coagulation bath maintained at a temperature range of 10 ~ 45 ℃ while passing at a rate of 0.5 ~ 5.0m / min It is preferable to solidify the polyurethane resin coating layer.

In the coating step, the polyurethane resin coating layer is applied to a thickness of 0.60mm to 3.0mm range, it is preferred to shrink to a thickness of 40% to 70% after the solidification step to the drying step.

Meanwhile, the polyurethane resin coating layer preferably has a density in the range of 0.15 g / cm 3 to 0.35 g / cm 3 through the solidification step to the drying step, and the base sheet preferably has a thickness of 0.1 mm to 2.0 mm. In addition, the polyurethane resin of the mixed solution for forming the coating layer has a molecular weight of 50,000 to 130,000, preferably a viscosity of 70,000 to 160,000 cps.

According to another aspect of the present invention, after the dehydration step, the synthetic resin film for supporting the base sheet by compressing and squeezed and combined with a polyurethane resin coating layer; A separation step of separating the base sheet from the composite sheet; Polishing the surface of the polyurethane resin coating layer on which the base sheet is separated and the support synthetic resin film is pressed; A film bonding step of adhering the pad synthetic resin film to the polishing surface of the polyurethane sheet; And a cutting step of separating the support synthetic resin film and cutting the polyurethane sheet to which the pad synthetic resin film is adhered to a predetermined standard.

Hereinafter, with reference to the accompanying drawings will be described in detail a polyurethane pad and a method for manufacturing the polishing target according to a preferred embodiment of the present invention.

Referring to FIG. 1, the polyurethane pad 110P for gripping the abrasive according to the present invention includes a pad synthetic resin film 102 on an abrasive surface 111G of a polyurethane sheet 110S. It has a structure made by bonding.

Figures 2a to 2c is shown to explain the process of forming the polyurethane pad for polishing the abrasive according to the invention (110P), referring to this first, as shown in Figure 2a synthetic film or polyester or nylon The polyurethane resin coating layer 110C is formed by applying a dimethylformamide mixture of polyurethane resin to the base sheet 100 selected from the fabrics.

Subsequently, the base sheet 100 and the polyurethane resin coating layer 110C are subjected to a series of solidification processes, washing / dehydrating processes, and drying processes, which will be described later, and the polyurethane resin from the base sheet 100 as shown in FIG. 2B. The coating layer 110C is separated into a sheet.

Next, as shown in FIG. 2C, the back surface of the polyurethane resin sheet 110S separated in the form of a sheet (the surface separated from the contact with the base sheet) 111 is grinder G or the like. Using a polishing process to apply the adhesive (B) to the polishing surface 111G, adhere the pad synthetic resin film 102 and cut it to a predetermined standard, as shown in FIG. Urethane pad 110P is formed.

According to the present invention, the dimethylformamide mixture of the polyurethane resin for forming the polyurethane resin coating layer 110C, based on 100 parts by weight of the polyurethane resin, 30 to 120 parts by weight of dimethylformamide; 0.5-15 weight part of succinic acid which is an anionic surfactant; 3.0-12.0 parts by weight of a nonionic surfactant composed of a mixture of silicone oil and polyol; Fillers from 2.0 to 10.0 parts by weight; 2.0-15.0 parts by weight of a dye preparation comprising a mixture of a color pigment and dimethylformamide; It consists of a solution in which the calcium chloride aqueous solution having a concentration of 50% and 0.3 to 3.0 parts by weight of any one water repellent selected from fluororesin, paraffin chloride and silicone oil are uniformly mixed.

Polyurethane sheet 110S constituting the polyurethane pad 110P for polishing a workpiece according to the present invention obtained through the process as described above is schematically shown by the reference numeral 113 in Figs. 1 and 2a to 2c. As shown, micropores (113) deep inside the tissue has a deep tissue feature. This histological characteristic can be observed through the result of photographing the pore formation state of the internal tissue shown in FIG. 3A with a scanning electron microscope (SEM).

Referring to FIG. 3A, the shape of the fine pores (not shown) is formed in a jar shape that is wide and elongated from the top, and the distribution is uniformly formed. In addition, looking at the bottom of the large and long formed pores has an organizational characteristic that almost no inorganic pore layer is formed. Here, the black background of the upper part and the lower part is a background surface generated when photographing, and is not related to the present invention.

FIG. 3B is a result of photographing the back surface 111 of the polyurethane sheet 110S separated from the base sheet 100 with a scanning electron microscope (SEM). It can be observed that it has a roughness state and is formed so that fine pores (not shown) are uniformly and evenly distributed.

The polyurethane pad 110P for gripping the abrasive according to the present invention has a back surface of the polyurethane sheet 110S separated from the base sheet 100 in the state of organizational characteristics as shown in FIGS. 3A and 3B. As the surface of the surface 111 is polished using a grinder G or the like, the micropores 113 formed inside the tissue have a tissue characteristic of being opened at the surface. This feature is characterized by the internal vertical cutting surface tissue and surface (pores 111G of FIGS. 1 and 2C) in which pores are opened immediately after polishing of the separating surface 111 of the polyurethane sheet (110S of FIG. 1) shown in FIGS. 3C and 3D, respectively. Can be observed through a photograph taken with a scanning electron microscope (SEM).

Therefore, the polishing pad according to the present invention, the polyurethane pad (110P), as described above, the micropores 113 having a plurality of uniform sizes are deeply formed inside the tissue, separated from the base sheet 110 By grinding the separated surface 111 of the polyurethane sheet 110S to increase the pore open rate on the surface, the hardness is lowered and the cushioning property (restoring force) is improved, so that the adsorption force on the abrasive is greatly improved. It will be carried. This characteristic is caused by a vacuum in the pores temporarily by the air exiting the open side.

On the other hand, the upper surface 112 of the polyurethane sheet (110S) constituting the polyurethane pad (110P) for gripping the abrasives according to the present invention is the surface of a conventional synthetic resin material as can be observed in the micrograph shown in Figure 3e It has a smooth surface as in

According to the present invention, the polyurethane sheet 110S has a thickness of 0.30 mm to 1.60 mm and preferably has a density of 0.15 to 0.35 g / cm 3. In addition, the pad synthetic resin film 102 is preferably formed in a thickness of 0.10mm ~ 0.50mm range.

Hereinafter will be described in detail with reference to the accompanying drawings with respect to the manufacturing method of the polyurethane pad for gripping the abrasive according to the present invention as described above.

3 is a view for explaining a coating process and a washing process and a dehydration process for manufacturing the polyurethane pad (100P) for gripping the polished object according to the present invention, with reference to which the base sheet wound on the supply roll (10) The dimethylformamide mixed solution (100L) of the polyurethane resin was applied to the base sheet (100) while supporting (100) by the plurality of guide rolls (R) and running continuously so as to be wound on the winding roll (20). As shown in the drawing, a polyurethane resin coating layer 100C is formed.

 The base sheet 100 is a base paper for making a polyurethane sheet 100S by applying a dimethylformamide mixed solution (100L) of polyurethane resin, any one selected from a synthetic resin film, polyester or nylon fabric is adopted, It is preferable to have a thickness of 0.3 ~ 1.60mm.

In the thickness limiting condition of the base sheet 100 as described above, a thickness of 0.1 mm or less has a problem in that the support force is weak to make a polyurethane sheet, and thus, sheet production itself is difficult. In addition, if the thickness is 2.0 mm or more, the dimethylformamide mixed solution of the polyurethane resin is applied to a predetermined thickness, and thereafter, the workability decreases when the solidification and dehydration are repeated by passing through a coagulation bath and a dehydration roll. . Therefore, in the present invention, the base sheet 110 preferably has a thickness of 0.1 to 2.0 mm.

According to one aspect of the present invention, when the base sheet 100 is selected as a synthetic resin film, it is preferable to form fine irregularities on the surface.

The reason for forming the surface to be coated with polyurethane on the synthetic resin film is an uneven surface, so that the polyurethane resin sheet is maintained without peeling the film and sheet in the process of repeatedly passing through a solidification tank or a dehydration roll (Mangle Roller) It is for. In particular, in the case of stone powder, the size of the diameter of 5 ~ 200㎛ is most preferable, the frictional effect of holding the polyurethane resin sheet is less when the lower limit is exceeded, and the surface of the polysurethane resin sheet is too rough when the upper limit is exceeded. There is a flaw that damages the smoothness.

On the other hand, it is preferable to add the stone powder in the range of 5 to 30 parts by weight with respect to the raw material of the film, in the case of falling outside the lower limit, the uneven surface of the film is not evenly formed, so the unevenness effect is small, and in the case of out of the upper limit, the excessive amount of the stone powder There is then a drawback that the strength of the film is weak and the film forming is poor.

In the method of forming fine concavo-convex on the synthetic resin film, the concave-convex may be formed on the surface of the film by corona discharge processing, plasma processing, or sandpaper.

According to another aspect of the present invention, as a method of forming fine irregularities in the synthetic resin film, it may be formed by applying and curing a mixture of an adhesive and a stone powder of 5 ~ 200㎛ diameter on the surface of the synthetic resin film. .

According to another aspect of the present invention, by adding 5 to 30 parts by weight of stone powder having a diameter of 5 ~ 200㎛ size to the raw material at the time of manufacturing the synthetic resin film, irregularities may be formed on the surface during the production of the synthetic resin film.

The polyester fabric is 100 to 200 ℃ after pretreatment of any one of the water-repellent agent selected from melamine resin, fluorine resin or silicone resin polyester plain weave fabric of weft and warp fineness (thickness) of 70 ~ 300 denier (D) Heat treatment for 10 seconds to 60 seconds to increase the weft and warp density of the fabric is preferably used to give a waterproof paper.

On the other hand, it is possible to use a textile paper coated with either a polyurethane resin solution or a PVC resin solution on the back surface of the polyester fabric paper, or a polyester (PET) resin or polyethylene on the back surface of the polyester fabric paper. It is preferable that any film selected from a film made of (PE) resin, a polypropylene (PP) resin and a thermoplastic polyurethane resin (TPU) is adhered to impart waterproofing properties. Such imparting waterproofness is to prevent the peeling phenomenon of the polyurethane sheet while increasing the surface density by preventing moisture penetration into the fabric.

According to the present invention, the dimethylformamide mixed solution (100L) of the polyurethane resin is 30 to 120 parts by weight of dimethylformamide with respect to 100 parts by weight of the polyurethane resin; 0.5-15 weight part of succinic acid which is an anionic surfactant; 3.0-12.0 parts by weight of a nonionic surfactant composed of a mixture of silicone oil and polyol; Fillers from 2.0 to 10.0 parts by weight; 2.0-15.0 parts by weight of a dye preparation comprising a mixture of a color pigment and dimethylformamide; It consists of a solution in which the calcium chloride aqueous solution having a concentration of 50% and 0.3 to 3.0 parts by weight of any one water repellent selected from fluororesin, paraffin chloride and silicone oil are uniformly mixed.

According to the present invention, it is preferable to apply a dimethylformamide mixed solution (100L) of polyurethane resin to the base sheet 100 to a thickness of 0.60mm ~ 3.0mm to form a coating layer (110C). The reason for this is to make the product manufacturing process faster due to the rapid application of solidification speed even though uniform coating is applied.If the coating is applied at a thickness that falls outside the lower limit, the pad sheet is too thin to act as a pad. There is a drawback that the workability is reduced due to the thick.

According to the present invention, the polyurethane resin has a molecular weight of 50,000 to 130,000, preferably a viscosity of 70,000 to 160,000 cps.

The polyurethane resin having a molecular weight of 50,000 to 130,000 is made by synthesizing any one selected from polyester polyol or polytetramethylene glycol (PTMG) with dimethylmethane diiso cyanate (MDI).

The use of the polyurethane resin (PU) having a molecular weight of 50,000 to 130,000 is to dissolve the polyurethane resin with dimethylformamide (DMF) and to coat the substrate, and then to maintain the polyurethane resin during solidification in the coagulation bath 30. The dimethylformamide of is dissolved in water and escapes to form a plurality of pores (cell) with a uniform size and uniform distribution.

Therefore, the molecular weight of the polyurethane resin (P.U) outside the range of 50,000 ~ 130,000 is intended to prevent this, because the bubble size is uneven or the distribution is formed unevenly.

In addition, when the amount of dimethylformamide added to the polyurethane resin is outside the range of 30 to 120 parts by weight, the size and distribution of bubbles are non-uniformly formed.

Therefore, fine and uniform bubbles are not formed on the inner surface and the surface of the pad for polishing the final product, and irregular and non-uniform bubbles are generated. Thus, the restoring force (cushionability) and hardness due to the vertical pressure are not overall uniform. The holding force on the polished object is lowered.

In addition, adding 0.5 to 5.0 parts by weight of succinic acid, which is the anionic surfactant, is used to increase the shape of the pores. The pore is formed too small at an amount of 0.5 parts by weight or less, and too large at an amount of 5.0 parts by weight or more. It is formed to be non-uniform, so as to prevent the recovery force from falling or weakening.

The addition of 3.0 to 12.0 parts by weight of the silicone oil, which is the nonionic surfactant, is intended to increase the solidification rate of the polyurethane solution in the coagulation bath or to uniform the pore shape. If the weight part or more, the pore shape is uneven and the density of the product is lowered or too high to prevent the holding force on the polished object is lowered.
The filler is a well-known component that is mainly added to make the surface porous during polyurethane production, as is well known. It is to adjust the absorption rate, smoothness and cushioning. In the polyurethane pad for polishing a workpiece according to the present invention, the optimum amount of pore size and porosity adjustment as described above was set by limiting the addition amount of the filler to 2.0 to 10.0 parts by weight.
In the present invention, commonly used fillers such as silica, wood powder, calcium carbonate (CaCO3), zeolite, and the like, which are generally employed by polyurethane processing companies, are used. It is known as 'Abocell' or 'Abocell' from Italy, which is imported and sold by the domestic ISA company, and is a calcium carbonate (CaCO3) produced by Dongwoo TMC in Korea or W-300 imported from Japan. Calcium carbonate (CaCO3) is known, which is composed mainly of tree ash (wood flour).

The carbon black is a known substance added as a colorant of the sheet, and when only carbon black is added, the dispersibility is weak so that the color is not uniformly dispersed in the dimethylformamide solution of the polyurethane resin, and thus the color is not uniform. When added to the mixture, it is possible to obtain an evenly dispersed effect by homogeneity with dimethylformamide in which the polyurethane resin is dissolved.

According to the present invention, the mixture of the dimethylformamide and the carbon black may be added to 2.0 to 15.0 parts by weight with respect to the polyurethane resin to obtain the best dispersibility.

The aqueous solution of calcium chloride is to control the density of the final product (sheet) to low to generate a lot of uniform pores on the surface, it is added to the aqueous solution is to increase the dispersibility like the carbon black described above.

In addition, the addition amount is 1.0 to 10.0 parts by weight in order to obtain the porous sheet with the highest dispersibility and the most active microbubbles, and at 1.0 parts by weight or less, a large amount of uneven pores appear on the surface. In 10.0 parts by weight or more, pores are too large or too large on the surface, so that the surface density is lowered.

The water repellent is to impart water repellency, and if water easily penetrates the polyurethane sheet, which is a final product, the gripping force of the abrasive is weakened, so that a water repellent is added in order to prevent moisture infiltration into the support sheet.

The addition amount of the water repellent is most preferably 0.3 to 3.0 parts by weight based on the polyurethane resin, the addition amount beyond the lower limit weakens the water repellency, the addition amount beyond the upper limit will lower the properties and efficacy of the other additive components.

As a next step, as described above, the base sheet 100 having the polyurethane resin coating layer 110C formed thereon is 3 to 15 parts by weight of dimethylformamide filled in the coagulation bath 30 maintained at a temperature range of 10 to 45 ° C. It is immersed in the aqueous solution 31 is subjected to the solidification process while traveling at a speed of 0.5 ~ 5.0m / min.

In the solidification process, dimethylformamide in the mixed solution of dimethylformamide in the polyurethane resin is dissolved in water, mixed with dimethylformamide in the coagulation bath, and the dimethylformamide in the polyurethane resin is replaced with water. Is gradually solidified, and a large number of pores are formed when the polyurethane resin is completely solidified.

According to the present invention, the coagulation condition as described above is a dimethylformamide while the polyurethane resin coating layer (100C) applied to the base sheet 100 passes through the aqueous solution of dimethylformamide (31) filled in the coagulation tank (30) Dissolved in water and water and dimethylformamide are exchanged to form pores, so that the most suitable pore size and uniform distribution in the formation of cells can be obtained. The replacement speed is set.

As a next step, the base sheet 100 and the polyurethane resin coating layer 100C which have undergone the solidification process as described above are continuously squeezed by a plurality of squeegee rolls SR while immersing and passing through the washing tank 40. . In this pressing process, dimethylformamide remaining by being mixed with water in the polyurethane resin coating layer 100C while repeating the process of continuously supplying water to the polyurethane resin coating layer 100C and the compression dehydration process through the spray S It is replaced with water to completely remove water and press water.

According to the present invention, in the dehydration process as described above, a plurality of squeeze rolls (SR) in the washing tank 40 is repeated several times, so that complete dehydration and dimethylformamide is removed.

As a next step, after the dehydration process as described above, the base sheet 100 and the polyurethane resin coating layer (100C) is wound on the winding roll 20 in roll form.

Subsequently, the base sheet 100 and the polyurethane resin coating layer 100C wound in rolls on the winding roll 20 after the dehydration process as described above were not shown in the drawing as a subsequent process, but a drying chamber ( Not shown) or dry to complete dehydration by natural drying.

The following is a final step for obtaining the polyurethane pad 100 for polishing the abrasive according to the present invention, as shown in Figure 2a to separate the polyurethane resin coating layer (100C) from the base sheet 100, Figure 2b Obtained polyurethane sheet 110S as shown in FIG. Subsequently, the separation surface 111 of the polyurethane sheet 110S is polished with a grinder G or the like to form the polishing surface 111G, as shown in FIG. 2C, thereby forming pores on the surface of the polishing surface 111G. After opening the coated with the adhesive (B) and bonded to the pad synthetic resin film 102 is cut to a predetermined standard to obtain a polyurethane pad (100P) for gripping the abrasive according to the present invention.

According to the present invention, the above polishing process may use sand paper including sand, metal and stone powder having a surface particle size in the range of P60 to P800. This polishing process is to lower the product hardness of the polyurethane pad 100, and to increase the cushion (chision).

Meanwhile, according to another aspect of the present invention, after dehydration and drying process, before the polyurethane resin coating layer (100C) is separated from the base sheet 100 to give the efficiency of the polishing process shown in Figure 5 As described above, it is preferable to go through the step of lapping with the synthetic resin film 101 for support.

That is, referring to Figure 4, a protective tape (T) is attached to one surface of the protective tape (T) is separated and removed while passing the support synthetic resin film 101 between the press roll (1a) (1b) winding roll Wind up in (2). At the same time, by pressing while passing the support synthetic resin film 101 from which the protective tape T is separated and the base sheet 100 on which the polyurethane resin coating layer 100C is formed, between the pressing rolls 3a and 3b. It is wound up by the winding roll (not shown) in the state which was combined.

As described above, the base sheet 100 in which the support synthetic resin film 101 and the polyurethane resin coating layer 100C wound together are press rolls 5a and 5b and a guide roll 6a as shown in FIG. 6. While passing through 6b, the base sheet 100 is separated and wound on a winding roll 7b, and the laminated synthetic resin film 101 and the polyurethane resin coating layer 100C are wound on the other winding roll 7a. Is wound up.

Subsequently, as a final step for obtaining the polyurethane pad 100 for polishing the polished object according to the present invention, the separating surface 111 of the polyurethane resin coating layer 100C in which the support synthetic resin film 101 is incorporated is as described above. After the same polishing process and bonding the synthetic resin film 102 for the pad, the support synthetic resin film 101 is separated and removed and cut to a predetermined standard to obtain a polyurethane pad (100P) for gripping the abrasive according to the present invention. .

According to the polyurethane pad 100P for polishing a workpiece according to the present invention obtained through the process as described above, the thickness of the polyurethane sheet 110S has a range of 0.30 mm to 1.60 mm, and the density is 0.15 g / It has a range of cm 3 to 0.35 g / cm 3, and the pad synthetic resin film 102 having a thickness in the range of 0.10 mm to 0.50 mm achieves the most preferable standard for holding the polished object. In the present invention, the reason for limiting the thickness of the polyurethane sheet 110S and the synthetic resin film 102 for pads is that when the pad is formed at a thickness outside the lower limit, the pad is too thin and difficult to perform the role of the pad itself. In the case of forming a thickness out of the thickness is too thick to overcome the drawback that the workability is degraded.

As described above, according to the present invention, the polyurethane pad for gripping the abrasive includes fine pores (cells) uniformly distributed inside the pad tissue, smooth and uniform recovery force (cushionability) due to hardness and vertical pressure, and strong water repellency. By having a function, it is possible to obtain an effect of maintaining a strong adsorption force on the polished object even under the condition of using water during polishing.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are intended to fall within the scope of the appended claims.

Claims (12)

Polyurethane resin and dimethylformamide mixed solution are applied to one surface of one of the base sheets selected from a synthetic resin film and polyester and nylon fabric to form a polyurethane resin coating layer, and the coating layer undergoes solidification, washing, dehydration and drying. Next, the surface separated from the base sheet of the polyurethane sheet separated from the base sheet in a sheet form is opened by a plurality of fine pores by polishing, and the synthetic resin film for the pad is adhered to the polishing surface. The polyurethane resin and dimethylformamide mixed solution, 30 to 120 parts by weight of dimethylformamide based on 100 parts by weight of polyurethane resin; 0.5-15 weight part of succinic acid which is an anionic surfactant; 3.0-12.0 parts by weight of a nonionic surfactant composed of a mixture of silicone oil and polyol; Fillers from 2.0 to 10.0 parts by weight; 2.0-15.0 parts by weight of a dye preparation comprising a mixture of a color pigment and dimethylformamide; A polyurethane pad for polishing a polishing pad, characterized in that it is uniformly mixed with 0.3% to 3.0 parts by weight of an aqueous calcium chloride solution having a concentration of 50%, a fluorine resin, and any water repellent selected from paraffin chloride and silicone oil. The method of claim 1, The coating layer is a polyurethane pad for polishing the abrasive, characterized in that having a density ranging from 0.15g / cm 3 to 0.35g / cm 3 after the solidification process, washing / dehydration process and drying process. The method of claim 1, The base sheet is a polyurethane pad for gripping the abrasive, characterized in that having a thickness of 0.1mm to 2.0mm. The method of claim 1, The polyurethane sheet is a polyurethane pad for gripping the abrasive, characterized in that the thickness has a range of 0.3mm ~ 1.6mm. The method of claim 1, The pad synthetic resin film is a polyurethane pad for gripping the abrasive, characterized in that the thickness has a range of 0.1mm ~ 0.5mm. 30 to 120 parts by weight of dimethylformamide, based on 100 parts by weight of polyurethane resin, on the surface of the synthetic resin film and the base sheet selected from polyester and nylon fabrics; 0.5-15 weight part of succinic acid which is an anionic surfactant; 3.0-12.0 parts by weight of a nonionic surfactant composed of a mixture of silicone oil and polyol; Fillers from 2.0 to 10.0 parts by weight; 2.0-15.0 parts by weight of a dye preparation comprising a mixture of a color pigment and dimethylformamide; A coating step of forming a polyurethane resin coating layer by uniformly mixing a solution of calcium chloride solution having a concentration of 50%, 0.3 to 3.0 parts by weight of any one water repellent selected from fluorine resin, paraffin chloride and silicone oil;   A solidification step of solidifying the polyurethane resin coating layer by immersing the base sheet on which the coating layer is formed in the coating step in an aqueous dimethylformamide solution; A water washing step of continuously squeezing the base sheet and the coating layer which have undergone the solidification step by a squeegee roll while immersing it in a washing tank; A dewatering step of continuously compressing and dehydrating the base sheet and the coating layer which have undergone the washing step by a squeegee roll; A drying step of drying the base sheet and the coating layer which have undergone the dehydration step; Separating the coating layer from the base sheet subjected to the drying step to obtain a polyurethane sheet; A polishing step of polishing the separation surface of the polyurethane sheet obtained by separating the coating layer from the base sheet; A pad film bonding step of adhering the pad synthetic resin film to the polishing surface of the polyurethane sheet; And And a pad cutting step of cutting the polyurethane sheet to which the pad synthetic resin film is adhered to a predetermined standard. 2. The method of claim 6, wherein in the solidification step, It characterized by solidifying the polyurethane resin coating layer while immersing the base sheet in a concentration of 3 ~ 15% dimethylformamide aqueous solution in the coagulation bath maintained at a temperature range of 10 ~ 45 ℃ while passing at a rate of 0.5 ~ 5.0m / min Method for producing a polyurethane pad for gripping the polishing target. The method of claim 6, wherein after the dehydration step, A synthetic step of compressing and compressing the support synthetic resin film for supporting the base sheet on a polyurethane resin coating layer; A separation step of separating the base sheet from the composite sheet; Polishing the surface of the polyurethane resin coating layer on which the base sheet is separated and the support synthetic resin film is pressed; A film bonding step of adhering the pad synthetic resin film to the polishing surface of the polyurethane sheet; And And a cutting step of separating the support synthetic resin film and cutting the polyurethane sheet to which the pad synthetic resin film is adhered to a predetermined standard. 2. The method of claim 6, In the coating step, the polyurethane resin coating layer is applied to a thickness of 0.60mm to 3.0mm, and after the solidification step to dry the polishing object characterized in that the shrinkage to a thickness of 40% to 70% range after Method of producing a polyurethane pad. The method of claim 6, The polyurethane resin coating layer has a density ranging from 0.15 g / cm 3 to 0.35 g / cm 3 through the solidification step to the drying step. The method of claim 6, The pad synthetic resin film is a method for producing a polyurethane pad for gripping the abrasive, characterized in that the thickness has a range of 0.1mm ~ 2.0mm. The method of claim 6, Synthetic resin film selected as the base sheet is a method for producing a polyurethane pad for gripping the abrasive, characterized in that irregularities are formed on the surface of the coating layer is formed.

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