KR100952121B1 - Method and apparatus for polishing surface of resin products - Google Patents

Abstract

The present invention relates to a surface polishing method and a surface polishing apparatus of a resin product for transparently and smoothly polishing a surface of a machined resin product made by machining rather than a casting resin product made by casting a resin, and a resin according to the present invention. The surface polishing method of the product may include: (1) preparing a product for preparing a resin product to be polished; (2) a polishing step of exposing the resin product obtained in the product preparation step with polishing steam to partially dissolve the surface of the resin product to remove scratches on the surface of the resin product; And (3) a drying step of drying the resin product polished in the polishing step.

Resin, Surface, Opacity, Transparency, Polishing, Polishing Vapor, Flaw

Description

Surface polishing method of resin products and surface polishing apparatus {Method and apparatus for polishing surface of resin products}

The present invention relates to a surface polishing method and a surface polishing apparatus of a resin product, and more particularly, a resin for transparently and smoothly polishing a surface of a machined resin product made by machining rather than a casting resin product made by casting a resin. A surface polishing method and a surface polishing apparatus of an article.

Resin products are widely used because of their corrosion resistance, processing convenience and other superior properties. In particular, a resin such as polycarbonate is widely used as a substitute for glass due to its transparency and impact resistance.

Resin such as polycarbonate has an advantage that a resin product having a smooth surface and transparency can be easily obtained when it is molded into a desired shape by casting molding such as injection molding or extrusion molding without undergoing a separate surface processing. .

Recently, there is an increasing demand for the development of resin products having a complex structure, such as a window of a biochip or a loadlock chamber, a kind of semiconductor equipment, and a resin product having a complex structure as described above. They are almost impossible to manufacture by casting, and are manufactured by machining such as machining centers. When the biochip or window is made of glass, there is a problem that it is easily broken during use, and glass is difficult to process, and processing to a glass product having a shape other than a specific shape such as dimensional accuracy and plate shape is very difficult. have.

Unlike cast molded resin products that have a smooth surface and transparency without going through a separate processing process at the same time of manufacturing, in the case of resin processed products, burrs or fine chips are formed on the surface even if they are precisely processed. They remain, and fine scratches remain on the surface of the resin product due to the physical friction applied during machining, thereby degrading the transparency of the resin product. Although such burrs or fine pieces can be removed with a sharp tool or knife, they are still cumbersome and cause a decrease in productivity, even after the separate removal of burrs or fine pieces is performed. The problem that it is difficult to secure the transparency of the resin product due to the flaws remaining on the surface remains.

Although these opaque resin products are not preferable, there is no solution, so they can be used as they are opaque or surface polishing through conventional surface polishing, but conventional polishing through surface polishing is also performed manually. It is still difficult to obtain a smooth and transparent product, and there are problems such as a decrease in productivity.

An object of the present invention is to provide a surface polishing method and a surface polishing apparatus for a resin product for transparently and smoothly polishing a surface of a machined resin product made by machining rather than a casting resin product made by casting a resin.

The surface polishing method of the resin product according to the present invention comprises: (1) preparing a product for preparing a resin product to be polished; (2) a polishing step of exposing the resin product obtained in the product preparation step with polishing steam to partially dissolve the surface of the resin product to remove scratches on the surface of the resin product; And (3) a drying step of drying the resin product polished in the polishing step.

When the resin product is made of polycarbonate, the polishing steam is a mixture of methylene chloride and chloroform (mixing ratio of methylene chloride and chloroform is within a range of 8 to 12 methylene chloride to chloroform 1 by weight). It can be steam.

A pretreatment step of pretreating the surface of the resin product obtained in the product preparation step may be further performed between the product preparation step and the polishing step.

The pretreatment step is carried out by sanding using three to six kinds of sandpaper in order from fine sandpaper (# 220) to fine sandpaper (# 2200), washing with a washing agent, rinsing with water, and then drying. Can be.

The drying step may be performed by leaving the product polished in the polishing step in the air at room temperature for 10 to 20 hours.

In addition, the surface polishing apparatus of the resin product according to the present invention includes a housing in which a polishing space in which a polishing operation is performed, and a product inlet for introducing an air inlet, an air outlet, and a resin product into the polishing space; And a steam generator for supplying polishing steam into the polishing space.

A first fluid storage space may be further formed on the inner bottom surface of the housing.

The steam generator may further be formed with a steam guide protruding toward the polishing space.

The housing may further include a second fluid storage space formed above the first fluid storage space, and further include a vertical guide directed downward from the second fluid storage space toward the first fluid storage space.

The lower end of the vertical guide may be further formed a fluid shock prevention guide formed by bending a portion of the lower end of the vertical guide roundly.

An air guide plate may be further formed at the air inlet of the housing to direct the flow of air introduced through the air inlet to the polishing space.

Therefore, according to the present invention, there is an effect of providing a surface polishing method and a surface polishing apparatus for a resin product for transparently and smoothly polishing a surface of a machined resin product made by machining rather than a cast resin product made by casting a resin.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The surface polishing method of the resin product according to the present invention comprises: (1) preparing a product for preparing a resin product to be polished; (2) a polishing step of exposing the resin product obtained in the product preparation step with polishing steam to partially dissolve the surface of the resin product to remove scratches on the surface of the resin product; And (3) a drying step of drying the resin product polished in the polishing step.

That is, the present invention dissolves burrs and / or fine pieces present on the surface of the resin product, including defects formed on the surface of the resin product by physical friction during machining by exposing the resin product to polishing steam. It is characterized in that the surface of the resin product is smoothed and the transparency is improved by removing it.

The product preparation step of (1) is a step of preparing a resin product that is subject to polishing, and mainly by using a known processing machine, such as mechanical processing, mainly machining centers, such as polycarbonate resin, rather than casting molding 3 It consists of processing into a resin product having a dimensional shape, which can be easily understood by those skilled in the art. However, in the case of the resin product obtained in this product preparation step, unlike casting molding, since a part of the resin is removed by cutting or polishing by physical friction, many fine flaws remain on the surface of the finally obtained resin product. As a result, an opaque product can only be obtained. Moreover, in the resin product obtained in the above product preparation step, burrs or fine pieces may still remain on the surface of the product. The present invention makes it possible to obtain a transparent product by polishing the surface of the resin product obtained by machining in the product preparation step as described above by exposing polishing vapor in the subsequent polishing step.

The polishing step (2) comprises exposing the resin product obtained in the product preparation step with polishing steam to partially dissolve the surface of the resin product to remove the flaw of the surface of the resin product. Polishing steam in the above may vary depending on the type of resin constituting the resin product, it may be mainly a vaporized solvent that can dissolve the resin. For example, in the case where the resin product is made of polycarbonate, the polishing vapor is a mixture of methylene chloride and chloroform (mixture ratio of methylene chloride and chloroform is in a weight ratio of methylene chloride to chloroform 1 in the range of 8 to 12 May be steam).

The polycarbonate is a material used as a molding main material of a DVD. Polycarbonate is a kind of synthetic resin, which belongs to engineering plastics among thermoplastic resins, and was developed by General Electric of the United States of America, and its main raw material is bisphenolol A resin. Polycarbonate has high mechanical strength, tensile strength and bending strength as well as impact strength, and has excellent characteristics such as high heat resistance and light transmittance, and is widely used as a building material as a substitute for glass. The impact resistance of polycarbonate is as strong as 250 times of plate glass, 150 times of tempered glass, and 56 times of acrylic, and it is suitable for use where safety is required because fragments do not scatter and break like glass even if broken. . The tensile strength of polycarbonate is about 705 kg / cm 2, the elongation is about 125%, the flexural strength is about 1,100 kg / cm 2, the compressive strength is about 870 kg / cm 2, and the impact strength is about 90 kg · cm / cm. Polycarbonate is about half the weight of flat glass, is flexible, has a specific gravity of about 1.2, has a light transmittance (95%) comparable to flat glass, and has a beautiful surface gloss. The thermal properties of polycarbonate are excellent in thermal efficiency due to low thermal permeability, high heat resistance (image 135'C), and excellent cold resistance (zero to 132 to 143 ℃) and are not affected by temperature changes.

The polycarbonate does not dissolve in aliphatic hydrocarbons and alcohols, but swells and dissolves in aromatic hydrocarbons, esters, and ketones, is well soluble in chlorinated hydrocarbons such as methylene chloride, chloroform, and chlorobenzene, and also dissolves in paradioxane and strong alkalis. Erosion, weak acid has the characteristics to withstand. Therefore, the polishing steam of the resin product made of polycarbonate may be made of chlorinated hydrocarbons. In particular, as a result of repeated experiments of the present inventors, the polishing steam is a mixture of methylene chloride and chloroform (mixing ratio of methylene chloride and chloroform is Most preferably, steam of methylene chloride in a weight ratio of methylene chloride in the range of 8 to 12 relative to chloroform 1 may be used. When methylene chloride is less than 8 parts by weight with respect to 1 part by weight of chloroform, the polishing efficiency is increased and the polishing time is decreased, but the solubility of the surface of the resin product becomes too high, and thus the surface is much dissolved. If the surface of the resin product is not polished uniformly, an adult phenomenon occurs, and thus, there may be a problem that a change in roughness occurs, and conversely, if it exceeds 12 parts by weight, the time required for surface treatment increases. Therefore, there may be a problem in that the productivity of the polishing operation is also not uniform, and the surface becomes opaque.

A pretreatment step of pretreating the surface of the resin product obtained in the product preparation step may be further performed between the product preparation step and the polishing step. The pretreatment step is to pretreat the surface of the resin product before polishing to remove impurities that may remain on the surface of the resin product or to mechanically remove large scratches or other burrs or pieces formed on the surface of the resin product. It can be understood as removing.

The pretreatment step is preferably sanded by using three to six kinds of sandpaper in order from coarse sandpaper (# 220) to fine sandpaper (# 2200), washed with a washing agent, rinsed with water, and dried. May be performed. Pretreatment using sandpaper as described above can be easily understood by those skilled in the art, and may be performed by sanding using sandpaper commercially provided by leading domestic and foreign manufacturers. The sandpaper at this time may be performed by using sanding in a constant direction in a constant direction by using sequentially in the order of fine sandpaper from rough sandpaper. At this time, the sandpaper is preferably sandpaper using five kinds of sandpaper, more preferably # 220, # 400, # 800, # 1,000 and # 1,200 can be carried out sanding using five sandpaper, but the present invention This is not limited to this. It is to be understood that the sandpaper using the sandpapers can be sanded using sandpaper soaked in water as in the conventional sandpapers.

The drying step of (3) consists of drying the resin product polished in the polishing step. The drying step may be understood to remove water or other solvents that may remain on the surface of the resin product after polishing or polishing is completed and after washing and rinsing.

The drying step may be performed by leaving the product polished in the polishing step in an air at room temperature for 10 to 20 hours, but the present invention is not limited thereto, and it is sufficient that the surface of the resin product is dried. If the drying time is less than 10 hours, there may be a problem that the sufficient drying is not made, if more than 20 hours, there may be a problem that takes too much time to dry and the productivity is lowered.

In addition, the surface polishing apparatus of the resin product according to the present invention, the polishing space 16, the air inlet 13, the air outlet 15 and the resin product in which the polishing operation is performed therein into the polishing space 16. A housing 11 in which a product inlet 12 for introduction is formed; And a steam generator 21 for supplying polishing steam into the polishing space 16.

The housing 11 has an inner space that forms a polishing space 16 in which a polishing operation is performed, and may have a hollow shape. The polishing space 16 is a space in which the polishing steam generated by the steam generator 21 is distributed at a higher concentration than other spaces in the housing 11, and the resin product targeted for polishing is exposed to the space. In this case, the surface of the resin product is partially dissolved, and at the same time, the surface of the resin product is smoothed and the transparency is transferred by the air flow to give a so-called "washing" effect.

The air inlet 13 and the air outlet 15 for forming the air flow are formed in the housing 11, and air may be introduced from the outside of the housing 11 through the air inlet 13. The air may be drawn out of the housing 11 through the air outlet 15. In order to generate air flow, a blower may be connected to the air inlet 13 side, the air outlet 15 side, or both. The blower may be a conventional blower that is typically rotated by an electric motor to generate air flow, it is to be understood that such a blower is known enough to purchase and use commercially supplied from leading manufacturers at home and abroad It can be. The air inlet 13 and / or the air outlet 15 may include a conventional filter. The filter installed at the air inlet 13 may function to remove contaminants that may be included in the air drawn into the housing 11, and the filter installed at the air inlet 13 may be formed at a semiconductor device. It may be a commercially available HEPA filter (High Efficiency Particulate Air filter) or ULPA filter (Ultra Low Penetration Air filter) or a combination thereof. The air filtration by the filter may be a combination of a pre-filter, a medium filter, a hepa filter, and a ulpa filter, as known in the art. It can be understood.

The polishing space 16 formed in the housing 11 is a space in which the concentration of the polishing vapor supplied from the steam generator 21 mounted in the housing 11 is higher than that of other places. Polishing is performed by adding a resin product.

The housing 11 is also provided with a product inlet 12, through which the resin product to be polished can be introduced into the polishing space 16 through the product inlet 12. It is of course understood that the addition of the resin product into the polishing space 16 from the outside of the housing 11 can be performed by hand, or by means of an automated conveyor belt or an automatic transfer system or an operable robot arm. It does not mean that this invention is limited to those mentioned above. The automated conveyor belt or the automatic transfer system or the robot arm can be understood as known, and can be selected and commercially available as needed.

The steam generator 21 serves to supply polishing steam into the polishing space 16. The steam generator 21 accommodates a polishing liquid which is formed according to the composition of the polishing steam to be generated, and can normally form the polishing vapor by heating and evaporating the polishing liquid by a heater 22 or the like. For example, when the polishing steam is for polishing polycarbonate, the polishing liquid is a mixture of methylene chloride and chloroform (mixture ratio of methylene chloride and chloroform is a ratio of 8 to 12 methylene chloride to chloroform 1 in weight ratio). It is within the range of).

The first fluid storage space 31 may be further formed on the inner bottom surface of the housing 11. Water, a solvent or a mixture thereof, preferably water, may be stored in the first fluid storage space 31, and the solvent may use any liquid capable of removing contaminants from the gas passing therethrough. Do. For example, the solvent may be used to dissolve or remove by contaminants that may be included in the polishing steam or the polycarbonate or air contained in the polishing steam, it can be used for the polishing of It can be understood to remove components that are undesirable to be released into the general atmosphere and according to the type of resin product and the type of filter that can be installed in the air inlet 13 and the like. This performs the function of a conventional water filter. Water or a solvent or a mixture thereof in the first fluid storage space 31 may be periodically exchanged or maintained in a continuous flow state while staying for a certain period of time. The periodic exchange may be carried out at regular intervals over time or intermittently depending on the degree of contamination of the water or solvent or mixtures thereof in the first fluid storage space 31 through appropriate measuring means. have. In addition, maintenance of the continuous flow state may be achieved by continuous flow at a low speed, and the periodic exchange or maintenance of the continuous flow state may be achieved by a first fluid connected to the first fluid storage space 31. It can be understood that it can be controlled by the interruption of the valve provided in the inlet pipe 32 and the valve provided in the first fluid outlet pipe 33.

The steam generator 21 may further include a steam guide 23 protruding toward the polishing space 16. The steam guide 23 guides the polishing steam generated and released from the inside of the steam generator 21 toward the polishing space 16, while maintaining a higher concentration of polishing steam in the polishing space 16. Function as possible. Moreover, the vapor guide 23 functions to make it easier for the resin product to be polished to enter and exit the polishing space 16. Preferably, the steam guide 23 extends from the steam generator 21 in a length of about 20 to 30 mm, but the present invention is not limited thereto, and the size or shape of the resin product to be polished, etc. It can be properly understood according to those skilled in the art that can vary accordingly.

The steam generator 21 is supported by the pedestal 24 so that the steam generator 21 is not affected by the fluid contained in the first fluid storage space 31, that is, water, a solvent, or a mixture thereof. The first fluid storage space 31 may be spaced apart from the first fluid storage space 31.

In the housing 11, a second fluid storage space 34 is further formed on the first fluid storage space 31, and the first fluid storage space 31 is formed from the second fluid storage space 34. Vertical guides 17 may be further included which are directed downwards towards the side. Preferably, the second fluid storage space 34 may be supplied with the same or similar fluid as that contained in the first fluid storage space 31, that is, water or a solvent or a mixture thereof. Can be. The fluid supplied to the second fluid storage space 34 is preferably overflowed from the second fluid storage space 34 so that the first fluid storage space downward along the vertical guide 17 ( It is possible to have a continuous flow of fluid towards 31). This may in particular facilitate the collection of contaminants resulting from the polishing space 16 formed at a position adjacent to the vertical guide 17. That is, the fluid that overflows from the second fluid storage space 34 and flows into the first fluid storage space 31 along the vertical guide 17 itself is also the first fluid storage space as described above. It performs the function of the usual water filter (34). The overflow of the second fluid storage space 34 is intermittent between the valve installed in the second fluid inlet pipe 35 connected to the second fluid storage space 34 and the valve installed in the second fluid outlet pipe 36. It can be understood that it can be controlled by.

The lower end of the vertical guide 17 may be further formed with a fluid check prevention guide 18 formed by bending a portion of the lower end of the vertical guide 17 roundly. The fluid check prevention guide 18 overflows from the second fluid storage space 34 and springs up as the fluid flowing downward along the vertical guide 17 falls into the first fluid storage space 31. Function to prevent it. This splash protection serves to minimize the polishing space 16 from being affected by the fluid. The fluid check prevention guide 18 is preferably spaced apart from the water surface of the fluid in the first fluid storage space 31 by a height of 5 to 10 mm. This height gap allows the flow of fluid in the first fluid storage space 31 as well as the air flow introduced through the air inlet 13 to the outside of the housing 11 through the air outlet 15. It is possible to make it flow, and at the same time, the air flow functions to force contact with the fluid in the first fluid storage space 31 to satisfy the function as a water filter by the fluid.

An air guide plate 14 may be further formed at the air inlet 13 of the housing 11 to direct the flow of air introduced through the air inlet 13 to the polishing space 16. The air guide plate 14 causes the air flow toward the polishing space 16 to be constantly directed so that the air flow passing through the polishing space 16 is disturbed in, before, or after the polishing space 16. By preventing the polishing from being performed uniformly.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described.

The following examples are intended to illustrate the invention and should not be understood as limiting the scope of the invention.

Example  One

A resin product that has a complex shape in three dimensions and is a resin product that requires transparency, by processing a substrate used in the manufacture of a commercially available biochip, using a machining center where a plate-shaped ingot made of polycarbonate resin is commercially processed. Was prepared.

On the other hand, using the surface polishing apparatus having a configuration as shown in Figure 1, performing the polishing of the resin product, as the performance conditions used to mix 10 parts by weight of methylene chloride with respect to 1 part by weight of chloroform as a polishing liquid In order to form the polishing steam, the polishing liquid obtained by heating and vaporizing the polishing liquid at a temperature of 40.2 ° C. was fed into the polishing space of the apparatus. On the other hand, the air flow flowing through the air inlet through the air inlet of the device to control the air flow by installing a flow rate generator 36-l per minute, water in the first fluid reservoir space and the second fluid reservoir space of the device The polishing process was performed while the first fluid storage space was stagnant and the second fluid storage space was supplied with water such that the overflowed water flowed along the wall thereof. Polishing was allowed to stay in the polishing space for 2 to 3 seconds and then withdrawn. The resin product before polishing is shown in the photograph in FIG. 2, and the resin product polished according to Example 1 is shown in the photograph in FIG. 3.

Comparative example  One

Except for forming the polishing steam using a mixture of 7 parts by weight of methylene chloride to 1 part by weight of chloroform as a polishing liquid was carried out in the same manner as in Example 1, the polished resin product is shown in Figures 4 and 5 As shown.

Comparative example  2

Except for forming the polishing steam using a mixture of 13 parts by weight of methylene chloride to 1 part by weight of chloroform as a polishing liquid was carried out in the same manner as in Example 1, the polished resin product is shown in Figures 6 and 7 As shown.

As a result of the synthesis of the above embodiments, it was confirmed that when polishing the resin product according to the present invention, the transparency of the resin product can be significantly improved. It was confirmed that the production of a resin product having On the other hand, when out of the mixing ratio of chloroform and methylene chloride in the polishing liquid according to the present invention, that is, the content of methylene chloride is insufficient, rather the content of chloroform increases, as shown in Figure 4 and 5, Although the polishing is performed well to some extent, the solubility in the resin product is so high that excessive dissolution causes severe dissolution at a part of the surface, especially a processed part such as a hole, causing adulteration or deformation of a part of the hole. It was confirmed that there is, the content of methylene chloride is increased, rather if the content of chloroform is too small, as shown in Figure 6 and 7, the polishing is not made well, like a mist on a part of the resin product It was confirmed that there was a problem such as clouding.

The present invention can be used in the industry of producing resin products such as polycarbonate by smoothing and making the surface of resin products formed by machining resin such as resin such as polycarbonate smooth.

1 is a configuration diagram schematically showing the configuration of a surface polishing apparatus of a resin product according to one specific embodiment of the present invention.

2 is a photograph of a resin product molded by machining before polishing.

3 is a photograph of a resin product polished according to Example 1 of the present invention.

4 and 5 are photographs taken of the resin product polished according to Comparative Example 1 as a control of the present invention.

6 and 7 are photographs taken of a resin product polished according to Comparative Example 2 as a control of the present invention.

Claims (11)

(1) preparing a product for preparing a resin product to be polished; (2) a polishing step of exposing the resin product obtained in the product preparation step with polishing steam to partially dissolve the surface of the resin product to remove scratches on the surface of the resin product; And (3) a drying step of drying the resin product polished in the polishing step; And, Wherein the resin product is made of polycarbonate, Wherein the polishing steam is a vapor of a mixture of methylene chloride and chloroform (mixing ratio of methylene chloride and chloroform is in the range of 8 to 12 ratio of methylene chloride to chloroform 1 by weight). Polishing method. delete The method of claim 1, And a pretreatment step of pretreating the surface of the resin product obtained in the product preparation step is further performed between the product preparation step and the polishing step. The method of claim 3, wherein The pretreatment step is carried out by sanding three to six kinds of sandpaper in order from fine sandpaper (# 220) to fine sandpaper (# 2200) in sequence, washing with a washing agent, rinsing with water, and then drying. Surface polishing method of the resin product characterized by the above-mentioned. The method of claim 1, And wherein said drying step is performed by leaving the product polished in said polishing step in an air at room temperature for 10 to 20 hours. A housing in which a polishing space in which a polishing operation is performed and a product inlet for introducing an air inlet, an air outlet, and a resin product into the polishing space are formed therein; And A steam generator for supplying polishing steam into the polishing space; Surface polishing apparatus of the resin product, characterized in that comprises a. The method of claim 6, The surface polishing apparatus of the resin product, characterized in that the first fluid storage space is further formed on the inner bottom surface of the housing. The method of claim 6, And a steam guide protruding toward the polishing space in the steam generator. The method of claim 7, wherein A second fluid storage space is further formed above the first fluid storage space in the housing, and further includes a vertical guide directed downward from the second fluid storage space toward the first fluid storage space. Surface polishing apparatus for resin products. The method of claim 9, The surface polishing apparatus of the resin product, characterized in that the lower end of the vertical guide is formed by further forming a fluid shock prevention guide formed by bending a portion of the lower end of the vertical guide roundly. The method of claim 6, And an air guide plate is formed at the air inlet of the housing to direct the flow of air drawn through the air inlet to the polishing space.

Images