JP2009238716A - Static electricity prevention agent and static electricity prevention sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a static electricity prevention charcoal sheet which can better remove impedance due to static electricity. <P>SOLUTION: A static electricity prevention charcoal agent in which a charcoal layer 1 is not soiled is obtained by mixing charcoal powder, ethylene vinyl acetate emulsion adhesive and water. The static electricity prevention charcoal agent is used for static electricity prevention by being applied to various material, for example, a static electricity prevention charcoal sheet obtained by forming the charcoal layer 1 on a sheet. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  About static electricity prevention

  Japanese Patent Laid-Open No. 10-251562 has data on conductive coatings for electromagnetic wave shielding. However, in order to prevent static electricity in this way, conductivity is considered an important factor, and conductive carbon, carbon fibers, and metal fibers are used. It is made from the main structure.

  Japanese Patent Application Laid-Open No. 2006-022144 relates to tack paper, but its function and application are different when the content of carbon powder is low and the manufacturing method and molding method are different.

  Japanese Patent Application No. 2002-074560 includes a charcoal paint blended with charcoal powder with a cellulose-based water-soluble polymer and ethanol.

  However, charcoal paint that has a majority of charcoal in the solid content, has excellent adsorptivity, has excellent flexibility, can adhere to any material, has water resistance, and has an antistatic function There is no.

Reference 1

JP-A-10-251620

Reference 2

JP2006-022144

Reference 3

Japanese Patent Application No. 2002-074560

  Conventionally, in order to remove static electricity, it is common knowledge to create a flow of electrons with a conductive material to move the charge, and as a static prevention material in production machines, conductive carbon or carbon fiber is used for grounding. It was common to drop it.

  However, although static electricity having a large potential can be removed, it is impossible to completely remove a constant potential of several thousand volts or less.

  Since no material that effectively absorbs static electricity has been found, there is no noticeable effect of conventional antistatic materials in places where static electricity always occurs. Although it is most effective, it is not appropriate for the production of paper and other materials that dislike moisture, and there is no way to properly control it.

  The inventor discovered an interesting effect in the process of developing a charcoal molding when no antistatic charcoal was applied and a mouse pad made of a resin plate provided with a charcoal layer was used.

  Therefore, in order to investigate the effects of charcoal on static electricity, after producing a static electricity generator, insulating carbon powder, which is made by adding 15% by weight of conductive carbon to this, and copper powder, Three types of antistatic charcoal added with the above were obtained, coated on a part of one side of the coated sheet to obtain a charcoal layer, and the relationship between static electricity and charcoal was tested.

  The antistatic charcoal containing copper powder mixed with insulating charcoal powder has a structure similar to the application of antistatic charcoal to the conductive sheet, as the copper powder settles on the bottom during the drying process and collects around the coated sheet. Become.

  For the coated sheet, 1 mm thickness made of polyethylene, 1 mm thickness made of polypropylene, and 1 mm thickness made of tinplate were used.

  Static electricity varies greatly depending on the weather, varies greatly depending on the location, and because the potential changes instantaneously, it was found through testing that it was difficult to control.

  The test results are attached in a separate sheet, but if a conductive tin plate is stretched inside a polyethylene sheet or polypropylene sheet as in the conventional theory that conductive materials control static electricity, the tinplate area and the tinplate area However, the potential decreased to one tenth or less. However, a potential that causes a failure remains, and it is difficult to control static electricity only by using conductivity.

  When an antistatic charcoal agent is applied to the inside of a polyethylene sheet or polypropylene sheet to obtain a coal bed, the potential of the coal bed portion is reduced to one-hundred or less, and even outside the coal bed portion is reduced to one-third or less, It is the most suitable static control method because it does not cause potentials that cause trouble.

  When carbon is added to the antistatic charcoal to give conductivity, it further decreases and falls to 1/8 or less even outside the coal layer.

  When a charcoal coating solution is applied to the inside of the tinplate, it can be seen that the potential outside the coal bed portion tends to decrease to 1/100 or less.

  There is no change in the numerical value even when grounding, and no grounding effect is recognized.

  Regardless of the difference in electrostatic potential between 1.4 kv and 5 kv, if a coal seam is provided, the potential range is within 0.06 kv.

  From these results, it was found that the provision of a charcoal layer has an extremely large antistatic effect regardless of the potential.

  When electrical conductivity was imparted to the sheet or coal layer, the potential was further lowered, but this was not a significant effect, and it was found that the coal layer has a significant antistatic action regardless of the presence or absence of electrical conductivity.

  If there is a coal bed on one side, the electrostatic potential is almost the same on both sides.

  In this test, conductive carbon was mixed in order to impart conductivity to the charcoal powder, but conductive carbon is not necessary if charcoal sintered at high temperature to be conductive is used.

  Tests were also conducted with slaked lime, but those with a lime layer formed had a decrease in electric potential similar to that when tin was applied, and the performance was greatly inferior compared with charcoal powder.

  Since charcoal has many nanometer-level micropores and slaked lime has few nanometer-level micropores, the difference in electrostatic absorption between charcoal and slaked lime is thought to be due to the difference in pores.

  From such test results, it is estimated that static electricity is absorbed by the micropores and the electric charge disappears, and that the porous material of charcoal, bamboo charcoal, or activated carbon having many micropores is excellent in antistatic action.

  In addition, in the conductive carbon layer and the conductive sheet, the movement of charges in the carbon powder layer is smoothly performed, and it is considered that the variation in potential depending on the location is reduced and the peripheral potential is also reduced.

  A problem in the production process and distribution is that during the production process, a part of the product adheres due to static electricity and the flow is disturbed, and the precision electronic components are destroyed by static electricity during the distribution process.

  In order to prevent static electricity in the production process, the problem can be solved quickly by applying an antistatic charcoal around the place where it occurs or by applying an antistatic charcoal sheet.

  In claim 1, 0.03 to 0.5 mm granular carbon powder, ethylene vinyl acetate resin emulsion adhesive, and water were mixed at a ratio of 10: 5 to 15: 0 to 10 to obtain an antistatic carbonizing agent. This is characterized by the fact that a charcoal layer with a solid content of 70% or more can be obtained, is characterized by controlling static electricity, and is water-resistant.

  Unlike vinyl acetate resin adhesives, ethylene vinyl acetate resin emulsion adhesives used for antistatic charcoal are water-resistant after drying, have excellent flexibility, and can adhere to any material. Since it is not viscous and smooth, it is difficult to block pores and does not interfere with static electricity absorption.

  The charcoal layer made of antistatic charcoal has water resistance and excellent flexibility, and the flexibility does not change even when applied to paper, cloth, non-woven fabric, resin film, etc., so it is suitable for coating on a sheet.

  Furthermore, it can be applied to almost all materials such as metal, resin, glass, etc., and it has water resistance, so it has an excellent property that does not get dirty even when used outdoors.

  Since the charcoal content ratio of the most preferable coal bed is 73%, the charcoal properties are maintained.

  Since it is necessary to obtain durability for use in production machines, it is durable and slippery if it is stretched so that the coal layer is on the back.

  Claim 2 is obtained by applying the antistatic charcoal of claim 1 to a sheet made of paper, nonwoven fabric, cloth, synthetic resin, and metal in a range of 0.01 to 0.5 mm to obtain a charcoal layer. It is a sheet having properties and flexibility, and is characterized by a remarkably large antistatic effect on the charcoal layer and the peripheral part.

  A third aspect is characterized in that the antistatic charcoal of the first aspect is applied to a synthetic resin pipe, an iron pipe, a machine or a container to control static electricity related to powder or liquid in particular.

The coating applied to the tube has the same antistatic effect both inside and outside.

  In addition, by utilizing the large content ratio of charcoal, it can be applied to the inside of the pipe for water purification and air purification.

  In addition, charcoal absorbs ultraviolet rays and does not deteriorate, so it can withstand long-term use outdoors.

  In order to test the effect of the anti-static carbonization sheet, a test was conducted on the iron surface around the static electricity generation part where the paper was stuck in the process of the paper processing machine. The number of personnel required to remove the power supply is no longer necessary, reducing the number of employees and improving productivity by 50%. Furthermore, conventionally, fog has been sprayed to humidify the paper, but even if the spraying is stopped, paper adhesion does not occur.

  As described above, the static electricity on the surface coated with the antistatic charcoal or the surface on which the antistatic charcoal sheet is stretched is minute, and no static electricity failure occurs.

  The present invention is characterized in that it absorbs static electricity by utilizing the porosity of charcoal, bamboo charcoal, activated carbon, etc., and prevents static electricity trouble that has been difficult to control.

  This is an epoch-making product that is very inexpensive and can provide a surface free from static electricity failure, which was impossible with conventional antistatic materials.

  A conductive antistatic charcoal is obtained by mixing 0.03 mm charcoal powder, conductive carbon, ethylene vinyl acetate resin emulsion adhesive and water in a ratio of 4.2: 0.8: 4: 4. An antistatic charcoal sheet in which a carbon layer is provided by uniformly coating a polyethylene sheet substrate to a thickness of 0.1 mm.

  Antistatic charcoal is obtained by mixing 0.2mm grains of high-temperature carbonized bamboo charcoal powder, ethylene vinyl acetate resin emulsion adhesive and water in a ratio of 5: 4: 5. An antistatic charcoal sheet that is covered with double-sided tape and pressed to hold the charcoal powder layer. At this time, carbon powder is about 72% of solid content.

  An antistatic charcoal is obtained by mixing 0.2 mm granular activated carbon powder, ethylene vinyl acetate resin emulsion adhesive and water in a ratio of 5: 5: 3, and is applied to a vinyl chloride pipe to a thickness of 0.2 mm.

  Since the ratio of charcoal is large, it is possible to obtain far-infrared effects, water purification, and air purification at a low cost.

  Since charcoal absorbs ultraviolet rays, the material inside the coal bed is not deteriorated by ultraviolet rays.

These are sectional drawings of the antistatic charcoal sheet of Example 1. These are sectional drawings of the vinyl chloride pipe which has a charcoal layer obtained by applying the antistatic charcoal of Example 3.

Explanation of symbols

1. Coal bed 2. Sheet base material3. PVC pipe

Claims (3)

    Charcoal powder, an ethylene vinyl acetate adhesive, and water are mixed to obtain an antistatic agent, which is applied to either a metal sheet or a polymer resin sheet to obtain an antistatic sheet.     An antistatic sheet comprising the charcoal powder coated surface of claim 1 covered with a metal sheet, a polymer resin sheet, paper, or a nonwoven fabric and bonded thereto, and a charcoal layer sandwiched therebetween.     An antistatic sheet obtained by mixing charcoal powder, an ethylene vinyl acetate adhesive, and water to obtain an antistatic agent, applying the antistatic agent to the cloth, and then covering and adhering the cloth to sandwich the charcoal powder between the cloths.

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