JP5878387B2 - Antistatic coating floor - Google Patents

Description

  The present invention relates to an antistatic coating floor having an antistatic function.

Single-layer or multi-layer coated floors are widely used as floors for various production facilities such as factories. Such a coated floor needs to have excellent resistance to chemicals and solvents used in factories and the like.
In addition, for example, clean rooms used in the manufacturing process of electronic components such as semiconductor elements, floors that require a high level of dust resistance, or handling of organic solvents and gases are required to prevent the occurrence of static electricity sparks. In addition to the above-mentioned resistance, the coated floor applied to the floor to be used must have a function of preventing electric charge (antistatic function) having a low electrical resistance value (leakage resistance value).

This is because a painted floor made of an insulator with a high leakage resistance value is easy to be charged when an operator walks on it, and it is difficult to leak static electricity accumulated in the painted floor itself or the worker due to charging. It is.
Therefore, dust that adheres to the operator's body due to the accumulated static electricity is brought into the clean room or mixed in the manufacturing process of the electronic component on the floor to be constructed in the electronic component manufacturing factory or the like. In order to provide a so-called dustproof performance for preventing this, it is required to have an antistatic function as described above.

In recent years, in order to prevent electronic components from being destroyed by static electricity generated when an operator walks or works on the floor, the coating floor (antistatic coating floor) In comparison with this, it has been required to have a higher antistatic function.
For example, in a factory that handles electronic parts that are destroyed by static electricity of 100 V or less, the potential of static electricity accumulated in the worker by charging when walking or working on the floor, the so-called human body charging potential is suppressed to tens of volts or less. It is required to have an antistatic function capable of

As a flooring material that can form an antistatic coating floor that satisfies these requirements, it is prepared by blending a binder resin, a conductivity imparting agent, and other additives as a base with a solvent such as an organic solvent or water. Paint-type flooring materials are known.
The paint-type coating floor material has a relatively low viscosity and can be applied by, for example, a roller or a brush, and can be applied to a thickness of, for example, about 0.5 mm or less by a single application. Refers to wood.

  According to the paint flooring and the coating floor material in which the conductivity-imparting agent is blended, the conductivity-imparting agent is brought into intimate contact with each other in the antistatic coating floor after the formation by reducing the volume by evaporation of the solvent. By increasing the number of contacts, a good path through which electricity flows can be constructed. For this reason, the leakage resistance value of the antistatic coating floor can be sufficiently reduced by adding a relatively small amount of the conductivity-imparting agent, and an appropriate antistatic function can be imparted to the antistatic coating floor (for example, Patent Document 1). reference).

  However, on the floors of factories that have introduced transportation means such as automated guided vehicles, forklifts, reach forks, etc., there are specific loads that receive high loads, especially from tires of the transportation means, or where workers frequently pass. In this region, there is a problem that the antistatic coating floor is locally worn and the antistatic function is lost in a relatively short period of time, and dust or the like is likely to be generated from the exposed ground such as concrete. In particular, since the antistatic coating floor made of the paint type coating floor material has a small thickness, these problems are likely to occur.

In recent years, the paint-type flooring material containing a large amount of an organic solvent has also been evaded due to problems such as odor and construction of ventilation during field construction.
On the other hand, when a sink type coating floor material (hereinafter sometimes referred to as “a sinking floor coating material”) is used, a coating floor having excellent strength and durability can be formed.
The sink flooring material is mainly composed of, for example, a curable binder resin such as an epoxy resin, and basically does not contain a solvent, or contains a small amount of solvent compared to a paint type, and relatively It is a high-viscosity type flooring material that is usually spread and applied using a gold trowel, etc. (spreading pan application), and is applied to a thickness of, for example, about 0.5 to 2 mm by a single application. Refers to the flooring material that can be.

According to the sink flooring material, it is possible to apply a thick coating as described above, and because the volume reduction due to evaporation of the solvent is small, the thickness is large, and it is made of a cured product of a curable binder resin. In combination, it is possible to form a coated floor having sufficient strength and having excellent durability that is not easily worn or lost locally in the specific region.
In addition, as mentioned above, sink flooring materials do not contain solvent basically or contain a small amount of solvent compared to paint type, so there are odor problems and ventilation problems at the construction site. There is also an advantage that it does not easily occur.

In order to reduce the leakage resistance value in order to give an antistatic function to the floor made of the above-mentioned floor pan coating material, for example, a conductivity imparting agent such as graphite, conductive carbon black, metal powder, metal fiber, etc. is blended. It is common to do.
However, as described above, since the volume reduction due to the evaporation of the solvent is smaller than that of the paint type as described above, it can be formed by bringing the conductivity-imparting materials into contact with each other in the antistatic coating floor after formation. There are few contacts.

Therefore, just adding the conductivity-imparting agent at a rate equivalent to that of the paint type does not provide a sufficient effect of reducing the leakage resistance value of the antistatic coating floor by constituting a good path through which electricity flows. There is a problem that an appropriate antistatic function cannot be imparted to the antistatic coating floor.
In order to sufficiently reduce the leakage resistance value of the antistatic coating floor, it is conceivable to increase the number of the contacts by increasing the blending ratio of the conductivity imparting agent.

However, in that case, the antistatic coating floor may be black (when graphite or conductive carbon black is included), or it may have a unique color tone (when metal powder or metal fiber is included), or it may have a glossy surface. There is a problem in that the appearance and appearance are impaired.
Further, as the blending ratio of the conductivity-imparting agent is increased, the blending ratio of the binder resin is relatively reduced, so that the above-described strength is particularly required for the antistatic coating floor formed by the above-mentioned non-stick coating floor material. There is also a problem that durability is lowered.

In Patent Document 2, white conductive fibers such as those in which the surface of potassium titanate (whisker) is coated with a conductive substance such as tin oxide and antimony are used as the conductivity imparting agent for the sink floor coating. It is described that the leakage resistance value of the antistatic coating floor is lowered without using it, thereby impairing the appearance and appearance.
However, according to the inventor's study, the white conductive fiber is not functionally different from the conventional conductivity-imparting agent described above, so that the human body charging potential can be suppressed to tens of volts or less. In order to form an antistatic coating floor having an antistatic function, it is necessary to increase the blending ratio as compared with the paint type. Therefore, although the white conductive fiber is white, it does not affect the color tone of the antistatic coated floor, but it solves the problem that the gloss of the surface is lost or the strength and durability are reduced. I can't.

Japanese Patent No. 2573105 JP-A-4-224858

  An object of the present invention is to provide a novel antistatic coated floor which has excellent appearance and beauty, has sufficient strength and durability, and has an antistatic function as compared with the conventional one. It is in.

The human body charging potential P _H is the amount of electrostatic charge Q ₁ generated, the amount of leaked charge Q ₂ , and the human body capacitance C _H : Equation (1):
P _H = (Q ₁ −Q ₂ ) / C _H (1)
The relationship is shown in To reduce the body charging potential P _H may be smaller charge amount Q ₁ of either increase body capacitance C _H, or the amount of charge Q ₂ to which leakage or generated.

However the capacitance _{C H} of the human body, not generally can vary about 100～150PF. Therefore conventionally, in order to increase the amount of charge Q ₂ to which leakage has been reduced the leakage resistance of the antistatic coating bed by increasing the mixing ratio of conductive agent as described above, of the Thus, there is a limit to the effect, and as the blending ratio is increased, the appearance and appearance of the antistatic coating floor are impaired, and the problem that the strength and durability tend to be reduced tends to occur. there were.

Therefore, the inventors have, instead of increasing the charge amount Q _2, or in addition to increasing the amount of charge Q _2, reducing the amount of charge Q ₁ of generating, suppress i.e. generation of static electricity itself I examined that.
When two objects touch, static electricity is generated by contact, peeling, and friction. The smaller the contact area between the two objects, the smaller the amount of static electricity generated by the contact, delamination and friction.

The inventor applies this theory to an antistatic coating floor, forms fine irregularities on the outermost surface of the antistatic coating floor, and reduces the contact area with the shoe sole of the operator, thereby reducing the above formula. (1) to reduce the charge amount to Q ₁ in thought to reduce the human body charging potential P _H.
As a result, in order to form fine irregularities on the outermost surface of the antistatic coating floor, a binder resin, a conductive resin, etc. are contained in a resin composition such as a non-stick flooring material that is the basis of the layer located on the outermost surface. It has been found that acrylic beads may be blended together with a property-imparting agent and the like.

Therefore, as a result of further investigation on the size of the irregularities formed by the blending of the acrylic beads, the size of the irregularities is expressed by the surface roughness Ra of the outermost surface of the antistatic coating floor, 0.1 μm or more, and 0.0. The inventors have found that the thickness may be within a range of 5 μm or less, and have completed the present invention.
Accordingly, the present invention is Ba inductor resin, conductive agent, and a resin composition comprising an acrylic bead, comprising at least a layer located on the outermost surface, the surface roughness Ra of the outermost surface 0.1μm or more, 0 It is an antistatic coating floor characterized by being 5 μm or less.

In the antistatic coating floor of the present invention, the surface roughness Ra of the outermost surface is limited to the above range for the following reason.
That is, when the surface roughness Ra of the outermost surface of the antistatic coating floor is less than 0.1 μm, the contact area between the outermost surface and the shoe sole of the operator is reduced by forming irregularities on the outermost surface, contact between them, peeling, and the charge amount Q ₁ generated by friction is reduced, thereby not to obtain the effect of reducing body charging potential P _H.

On the other hand, when the surface roughness Ra exceeds 0.5 μm, the unevenness of the outermost surface becomes too large and the gloss is lost, and the appearance and appearance of the antistatic coating floor are impaired.
In contrast, by setting the surface roughness Ra of the outermost surface of the antistatic coating floor within the above range, the outermost surface and the shoe of the operator are maintained while maintaining the good appearance and beauty of the antistatic coating floor. the contact area between the bottom and the like by reducing the contact therebetween, peeling, and the charge amount Q ₁ generated by friction is reduced, thereby allowing to reduce the human body charging potential P _H.

In the present invention, the surface roughness Ra is the roughness specified in Japanese Industrial Standard JIS B0601: 2001 “Product Geometrical Specification (GPS) —Surface Property: Contour Curve Method—Terminology, Definition, and Surface Property Parameter”. It will be expressed by the arithmetic average roughness Ra of the curve.
The blending ratio of the acrylic beads in the resin composition that is the basis of the antistatic coating floor of the present invention is preferably 6 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the binder resin.

When the blending ratio of the acrylic beads is less than the above range, the resin composition is formed on the base, although it varies depending on the average particle diameter of the acrylic beads and the coating amount of the resin composition per unit area. and a layer, the surface roughness Ra of the outermost surface of the antistatic coating bed becomes less than the above range, by reducing the contact area between the operator of the sole such as by forming irregularities on the outermost surface, contact between them, peeling, and reduces the amount of charge Q ₁ generated by friction, whereby the effect of reducing the body charging potential P _H may not be sufficiently obtained.

On the other hand, when the blending ratio exceeds the above range, the surface roughness Ra of the outermost surface of the antistatic coating floor exceeds the range, the gloss of the outermost surface is lost, and the appearance and beauty of the antistatic coating floor are lost. Wearability may be impaired. Further, since the blending ratio of the binder resin is relatively reduced, the strength and durability of the antistatic coating floor may be lowered.
On the other hand, by maintaining the blending ratio of the acrylic beads within the range of 6 parts by mass or more and 50 parts by mass or less, the good appearance and appearance of the antistatic coated floor, or sufficient strength and durability are maintained. while the by reducing the contact area between the shoe sole or the like of the outermost surface and the operator, the contact between the two, small peeling, and the charge amount Q ₁ generated by friction, reducing body charging potential P _H The effect can be further improved.

The antistatic coating floor of the present invention preferably has a leakage resistance value of less than 1 × 10 ⁹ Ω.
When the leakage resistance value is equal to or greater than the above range, unevenness that satisfies the range of the predetermined surface roughness Ra is formed on the outermost surface of the antistatic coating floor to reduce the contact area with the shoe sole of the operator. as well, since the charge amount Q ₂ to which leaking is too small, there is a possibility that the effect of reducing body charging potential P _H can not be obtained.

Note From principles of reducing the amount of charge Q ₂ to increase to the human body charging potential P _H, the leakage resistance is preferably as small as possible even within the above range. However, in consideration of improving safety by preventing accidents due to electric leakage, the leakage resistance value is preferably 2.5 × 10 ⁴ Ω or more even within the above range. This value assumes the case where an alternating current of 200 V flows through the worker's body to the antistatic coating floor, and corresponds to the minimum leakage resistance value for flowing only a current of 10 mA or less. This is because when the value of current flowing through the body exceeds 10 mA, the muscle contracts and loses control power, increasing the risk.

  According to the present invention, it is possible to provide a novel antistatic coating floor that has excellent appearance and beauty, has sufficient strength and durability, and is superior in antistatic function as compared with conventional ones. Can do.

The present invention, bus inductor resin, conductive agent, and at least includes a layer located on the outermost surface of a resin composition containing the acrylic beads, the surface roughness Ra of the outermost surface 0.1μm or more, 0.5 [mu] m An antistatic coating floor characterized by the following.
<Resin composition>
<Binder resin>
The binder resin is preferably a two-component curable resin, a moisture curable resin, a radical polymerizable resin, or the like that can be cured and reacted at about room temperature (5-35 ° C.) without requiring heating, particularly in field construction.

In consideration of minimizing the amount of the solvent to be blended in the resin composition or omitting the blending of the solvent, the binder resin is preferably a liquid resin that exhibits a liquid state before being cured.
Examples of the curable binder resin include one or more of epoxy resin, urethane resin, acrylic resin, polyester resin, vinyl ester resin, and the like.

  In particular, high strength is imparted to the antistatic coating floor to make it difficult to be locally worn or lost in the specific areas described above, and to reduce the amount of solvent to be blended in the resin composition as much as possible. In view of omitting the blending of the solvent and the like, a liquid epoxy resin, particularly a two-component curable epoxy resin which is liquid and can be cured and reacted with a curing agent is preferable.

<Conductivity imparting agent>
As a conductivity imparting agent, blended in the resin composition, the leakage resistance value of the antistatic coating floor is adjusted, for example, within the range of 2.5 × 10 ⁴ Ω or more and less than 1 × 10 ⁹ Ω described above. Any of various conventionally known conductivity imparting agents that can be used can be used. In particular, it is preferable to use carbon fiber and conductive zinc oxide powder in combination as a conductivity imparting agent.

(Carbon fiber)
As the carbon fiber, any of PAN-based and PITCH-based carbon fibers classified by the production raw material can be used.
The carbon fiber, as a conductivity imparting agent, has a function of adjusting the leakage resistance value of the antistatic coating floor within the above-mentioned range, and the end of the carbon fiber protrudes to the outermost surface of the formed antistatic coating floor to form a contact (electrode ) To ensure good energization with the shoe sole of the worker in contact with the outermost surface. Therefore, the antistatic performance of the antistatic coating floor can be further improved by using the carbon fiber as a conductivity imparting agent.

The carbon fiber preferably has an average fiber length of 0.1 mm or more and 1.0 mm or less.
If the average fiber length is less than the above range, there is a possibility that the effect of improving the antistatic performance of the antistatic coating floor by the above mechanism due to the blending of carbon fibers may not be sufficiently obtained. Further, in order to set the average fiber length of the carbon fibers within the above range, for example, the long fiber carbon fiber, the chopped fiber obtained by cutting the long fiber carbon fiber short, the middle fiber, and the like are further pulverized. However, this is also because it is not easy to stably produce extremely short carbon fibers having an average fiber length less than the above range by such grinding.

On the other hand, when the average fiber length exceeds the above range, the black color of the carbon fiber becomes conspicuous on the outermost surface of the antistatic coating floor after formation, and the appearance and appearance of the antistatic coating floor are impaired. There is a risk of being.
In consideration of further improving the above-described effect of improving the antistatic performance of the antistatic coating floor by blending the carbon fiber, the average fiber length of the carbon fiber is 0.3 mm or more even within the above range. Preferably there is. In consideration of further improving the appearance and appearance of the antistatic coating floor, the average fiber length is preferably 0.9 mm or less even within the above range.

The blending ratio of the carbon fibers is preferably 0.1 parts by mass or more and preferably 2 parts by mass or less per 100 parts by mass of the binder resin.
When the blending ratio is less than the above range, there is a possibility that the effect of improving the antistatic performance of the antistatic coating bed by the above mechanism due to the blending of carbon fiber may not be sufficiently obtained.
On the other hand, when the blending ratio exceeds the above range, the black color of the carbon fiber becomes conspicuous on the outermost surface of the antistatic coating floor after formation, and the appearance and appearance of the antistatic coating floor are impaired. There is a fear. Further, since the blending ratio of the binder resin is relatively reduced, the strength and durability of the antistatic coating floor may be lowered.

  In consideration of further improving the above-described effect of improving the antistatic performance of the antistatic coating floor by blending the carbon fiber, the blending ratio of the carbon fiber is 0.2 parts by mass or more even within the above range. Is preferred. In consideration of further improving the appearance and appearance, or the strength and durability of the antistatic coating floor, the blending ratio is 1.5 parts by mass or less, particularly 0.7 parts by mass or less, even within the above range. Preferably there is.

(Conductive zinc oxide powder)
As the conductive zinc oxide powder, any of various conductive zinc oxide powders can be used, such as zinc oxide made into an N-type semiconductor by doping different elements such as aluminum and gallium.
Examples of the conductive zinc oxide powder include 23-K (volume resistivity: 100 to 500 Ω · cm, specific surface area 4 to 10 m ² / g) manufactured by Hakusui Tech Co., Ltd., and passette GK-40 (volume resistivity: 20). ˜100 Ω · cm, specific surface area 30˜50 m ² / g] and the like. The volume resistivity is a value measured in a state where the powder is compressed at 10 MPa.

  In addition to the function of adjusting the leakage resistance value of the antistatic coating floor within the above range, the conductive zinc oxide powder is interposed between adjacent carbon fibers as an electrical conductivity imparting agent, It also serves to secure the connection. Therefore, the antistatic performance of the antistatic coating floor can be further improved by using a conductive zinc oxide powder together with the carbon fiber as a conductivity imparting agent.

Moreover, the conductive zinc oxide powder is white and does not impair the appearance and appearance of the antistatic coating floor.
The blending ratio of the conductive zinc oxide powder is preferably 50 parts by mass or more and preferably 120 parts by mass or less per 100 parts by mass of the binder resin.
If the blending ratio is less than the above range, there is a possibility that the effect of improving the antistatic performance of the antistatic coated floor by the above mechanism by blending the conductive zinc oxide powder may not be sufficiently obtained.

On the other hand, when the blending ratio exceeds the above range, the outermost surface gloss may be lost, and the appearance and appearance of the antistatic coating floor may be impaired. Moreover, since the blending ratio of the binder resin is relatively reduced, the strength and durability of the antistatic coating floor may be lowered.
<Acrylic beads>
As an acrylic bead for forming irregularities on the outermost surface of the antistatic coating floor, in particular, a cross-linked acrylic bead excellent in resistance to a solvent contained in the resin composition, a binder resin before cross-linking, etc., and excellent in weather resistance, Among these, colorless transparent and white crosslinked acrylic beads are preferably used, which are less likely to impair the appearance and appearance of the antistatic coating floor.

  Examples of the crosslinked acrylic beads include Art Pearl (registered trademark) SE-006T (average particle size: 6 μm), G-800 transparent [average particle size: 6 μm], and GR-800 transparent [average] manufactured by Negami Kogyo Co., Ltd. Particle size: 6 μm], GR-600 transparent [average particle size: 10 μm], G-400 transparent [average particle size: 15 μm], GR-400 transparent [average particle size: 15 μm], GR-300 transparent [average particle size] : 22 μm], GS-350T [average particle size: 30 μm], GR-200 transparent [average particle size: 32 μm], SE-050T [average particle size: 46 μm], SE-090T [average particle size: 110 μm], GR -50 W [average particle diameter: 120 μm] and the like.

  The surface roughness Ra of the outermost surface of the antistatic coating floor is adjusted by adjusting the average particle diameter of the acrylic beads, the blending ratio in the resin composition, and the coating amount of the resin composition per unit area. Can be changed arbitrarily. Therefore, it is suitable for forming an antistatic coated floor having a predetermined surface roughness Ra within the range of 0.1 μm or more and 0.5 μm or less as described above when a predetermined blending ratio and application amount are set. It is preferable to use one or more acrylic beads having an average particle diameter selected from the acrylic beads.

The blending ratio of the acrylic beads is preferably 6 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the binder resin.
When the blending ratio of the acrylic beads is less than the above range, the resin composition is applied on the base, although the average particle diameter of the acrylic beads and the coating amount of the resin composition per unit area are different as described above. The surface roughness Ra of the outermost surface of the antistatic coated floor comprising the layers formed in this manner is less than the above range, and the contact area with the shoe sole of the operator is reduced by forming irregularities on the outermost surface. to the contact therebetween, peeling, and reduces the amount of charge Q ₁ generated by friction, whereby the effect of reducing the body charging potential P _H may not be sufficiently obtained.

On the other hand, when the blending ratio exceeds the above range, the surface roughness Ra of the outermost surface of the antistatic coating floor exceeds the range, the gloss of the outermost surface is lost, and the appearance and beauty of the antistatic coating floor are lost. Wearability may be impaired. Further, since the blending ratio of the binder resin is relatively reduced, the strength and durability of the antistatic coating floor may be lowered.
On the other hand, by maintaining the blending ratio of the acrylic beads within the range of 6 parts by mass or more and 50 parts by mass or less, the good appearance and appearance of the antistatic coated floor, or sufficient strength and durability are maintained. while, to reduce the contact area between the operator of the sole such as the outermost surface of the antistatic coating bed, the contact between the two, to reduce flaking, and the charge amount Q ₁ generated by friction, the body charged potential Furthermore it is possible to improve the effect of reducing the P _H.

<Others>
The resin composition further includes a curing agent for curing the binder resin, and for adjusting the viscosity and fluidity when the resin composition is applied on a base as, for example, a non-stick flooring material. The solvent, the reactive diluent, the toner for coloring the antistatic coating to be formed, and the like can be blended at an appropriate ratio. The toner is obtained by pulverizing the colorant together with a binder resin in order to improve the dispersibility of the colorant such as a pigment in the resin composition.

In consideration of the pot life and the like, the resin composition is supplied as a two-component type of a main agent containing each component excluding the curing agent and the curing agent, and at the construction site, the main agent and the curing agent are predetermined. It is preferable to mix them in proportions.
《Antistatic coating floor》
The antistatic coating floor of the present invention is a layer located on the outermost surface of the antistatic coating floor, which is formed by, for example, pouring, applying, and curing the resin composition on a base as a sink coating floor material. The surface roughness Ra of the outermost surface is not less than 0.1 μm and not more than 0.5 μm . For example, in the case of the two-component resin composition, the base agent and the curing agent are mixed at a predetermined ratio at the construction site as described above to prepare a cast flooring material and the like on the foundation. The layer is formed by, for example, applying a non-stick coating and curing.

The configuration of the present invention is applicable to various antistatic coating floors having a single layer or a multilayer structure. That is, the acrylic beads resin composition was applied containing, may form an antistatic coating floor layer single layer formed by curing. In this case, the layer is naturally a layer located on the outermost surface of the antistatic coating floor.
Moreover, you may comprise the antistatic coating floor of the multilayer structure containing the said layer. The Antistatic coating floors of a multi-layer structure, the layer positioned on the outermost surface is coated with a resin composition containing the acrylic beads, it shall be the layer formed by curing.

In any case, due to the function of the layer, that is, the function of the acrylic beads contained in the layer, the surface roughness Ra of the outermost surface of the antistatic coating floor is not less than 0.1 μm and not more than 0.5 μm. It is possible to obtain an antistatic coated floor that is excellent in appearance and appearance, has sufficient strength and durability, and has an antistatic function as compared with the conventional one.
The reason why the surface roughness Ra of the outermost surface of the antistatic coating floor is limited to the above range is as follows.

That is, when the surface roughness Ra of the outermost surface of the antistatic coating floor is less than 0.1 μm, the contact area between the outermost surface and the shoe sole of the operator is reduced by forming irregularities on the outermost surface, contact between them, peeling, and the charge amount Q ₁ generated by friction is reduced, thereby not to obtain the effect of reducing body charging potential P _H.
On the other hand, when the surface roughness Ra exceeds 0.5 μm, the unevenness of the outermost surface becomes too large and the gloss is lost, and the appearance and appearance of the antistatic coating floor are impaired.

In contrast, by setting the surface roughness Ra of the outermost surface of the antistatic coating floor within the above range, the outermost surface and the shoe of the operator are maintained while maintaining the good appearance and beauty of the antistatic coating floor. the contact area between the bottom and the like by reducing the contact therebetween, peeling, and the charge amount Q ₁ generated by friction is reduced, thereby allowing to reduce the human body charging potential P _H. Specifically, by applying a good antistatic function antistatic coating bed, the body charged potential P _H to 50V or less, particularly preferably can be reduced to 30V or less.

The human body charged potential _{P H,} in the present invention, the temperature 23 ° C., under a relative humidity of 50%, Japanese Industrial Standard JIS C61340-4-5: 2007 "Electrostatic - Standard Test Method for particular applications - and the human body It shall be expressed by the value measured in accordance with “6.4 Measurement of electrification” described in “Evaluation method of antistatic performance of footwear and floor system in combination”.
Note the surface roughness Ra of the antistatic coating the outermost surface of the bed, while maintaining its appearance and YoshiSosei the best possible conditions, considering that more to further reduce the human body charging potential P _H, even within the range It is preferably 0.11 μm or more, preferably 0.45 μm or less, particularly preferably 0.30 μm or less.

Further, the antistatic coating floor preferably has a leakage resistance value of less than 1 × 10 ⁹ Ω.
When the leakage resistance value is equal to or greater than the above range, unevenness that satisfies the range of the predetermined surface roughness Ra is formed on the outermost surface of the antistatic coating floor to reduce the contact area with the shoe sole of the operator. as well, since the charge amount Q ₂ to which leaking is too small, there is a possibility that the effect of reducing body charging potential P _H can not be obtained.

Note From principles of reducing the amount of charge Q ₂ to increase to the human body charging potential P _H, the leakage resistance is preferably as small as possible even within the above range. However, in consideration of improving safety by preventing accidents due to electric leakage, the leakage resistance value is preferably 2.5 × 10 ⁴ Ω or more even within the above range. This value assumes the case where an alternating current of 200 V flows through the worker's body to the antistatic coating floor, and corresponds to the minimum leakage resistance value for flowing only a current of 10 mA or less. This is because when the value of current flowing through the body exceeds 10 mA, the muscle contracts and loses control power, increasing the risk.

In the present invention, the leakage resistance value of the antistatic coating floor is determined using the Japanese Industrial Standard JIS C61340-4-1: 2008 “Static Electricity” using an insulation resistance meter and electrodes in an environment of a temperature of 23 ° C. and a relative humidity of 50%. -Part 4-1: Standard test method for specific application-Electrical resistance of flooring materials and construction floors "It shall be expressed by the value measured according to the measurement method.
The leakage resistance value can be arbitrarily changed by adjusting the blending ratio of the conductivity-imparting agent and acrylic beads to the resin composition, or the coating amount of the resin composition per unit area.

Example 1
<Preparation of resin composition>
(Main agent)
As the binder resin, a two-component curable liquid epoxy resin [jER (registered trademark) 828 manufactured by Mitsubishi Chemical Corporation, viscosity at 25 ° C .: 12 to 15 Pa · s, epoxy equivalent: 184 to 194] is used. It was.

As the conductivity imparting agent, chopped fiber as carbon fiber [DIALEAD (registered trademark) K6331T manufactured by Mitsubishi Plastics, fiber length: 6 mm] is pulverized so that the average fiber length is 0.7 mm. , Conductive zinc oxide powder [23-K, Huxitec Co., Ltd., volume resistivity: 100 to 500Ω, specific surface area: 4 to 10 m ² / g described above] was used in combination.
The average fiber length of the carbon fibers was determined as an average value of values obtained by randomly measuring the fiber lengths of n = 100 samples from an image taken using a digital microscope (Leica DVM5000 manufactured by Leica Microsystems).

As the acrylic beads, cross-linked acrylic beads [Art Pearl (registered trademark) SE-090T, manufactured by Negami Kogyo Co., Ltd., average particle size: 110 μm] were used.
Further, SET T-26 manufactured by Mikuni Dye Co., Ltd. was used as the toner.
100 parts by mass of the epoxy resin is mixed with 0.5 parts by mass of carbon fiber, 100 parts by mass of conductive zinc oxide powder, 6 parts by mass of acrylic beads, 10 parts by mass of toner, and 20 parts by mass of benzyl alcohol as a solvent, and stirred. Using a machine (Haidon (registered trademark) Three-One Motor manufactured by Shinto Kagaku Co., Ltd.), mixing was carried out at 1200 rpm to prepare a base material for a cast-on flooring material.

(Curing agent)
As a curing agent, Daito Sangyo Co., Ltd. trade name Daitokural X-6045 was used.
<Preparation of antistatic coated floor sample>
(Conductive primer)
As the conductive primer, a mixture of SL333A (main agent) and SL333B (curing agent) manufactured by Sumitomo Rubber Industries, Ltd. at a mass ratio of 4: 1 was used.

(Base)
As a base, a primer layer is formed by applying the conductive primer on a slate plate using a roller so that the coating amount per unit area is 110 ± 5 g / m ² and then curing. Prepared.
(Sample preparation)
The main agent and the curing agent of the previously prepared sink flooring material are mixed so that the mixing ratio of the curing agent per 100 parts by mass of the epoxy resin in the main agent is 45 parts by mass, and mixed to flow. A bedding flooring was prepared.

Next, after the above-mentioned base layer primer layer is formed and the above-mentioned primer layer is formed by using a gold trowel, it is cast and applied so that the coating amount per unit area becomes 1350 ± 10 g / m ^2. Cured to prepare a sample of an antistatic coating.
<< Comparative Example 1 >>
Except that the acrylic beads were not blended in the main agent, the main agent and the curing agent of the non-stick coating floor material were prepared in the same manner as in Example 1 to prepare a sample of the antistatic coating floor.

<< Examples 2 to 5, Comparative Examples 2 and 3 >>
The mixing ratio of the acrylic beads in the main agent is 2 parts by mass (Comparative Example 2), 10 parts by mass (Example 2), 15 parts by mass (Example 3), 30 parts by mass (100 parts by mass) of the epoxy resin in the main agent. Example 4) The main component and the curing agent of the non-stick flooring material were prepared in the same manner as in Example 1 except that 50 parts by mass (Example 5) and 70 parts by mass (Comparative Example 3) were used. A sample of an antistatic coating floor was prepared.

<< Examples 6 and 8 >>
Implemented except that the spreader floor coating was applied so that the coating amount per unit area was 1000 ± 10 g / m ² (Example 6) and 2700 ± 10 g / m ² (Example 8). A sample of an antistatic coating floor was prepared in the same manner as in Example 1.
<< Examples 7 and 9 >>
Implemented except that the spreader floor coating was applied so that the coating amount per unit area was 1000 ± 10 g / m ² (Example 7) and 2700 ± 10 g / m ² (Example 9). A sample of an antistatic coated floor was prepared in the same manner as in Example 5.

<Surface roughness measurement>
The surface shape of the surface of the antistatic coated floor sample prepared in each of the above examples and comparative examples was measured using a surface roughness meter [Surface Com (registered trademark) 130A manufactured by Tokyo Seimitsu Co., Ltd.]. From the results measured under the conditions of evaluation length: 3.2 mm, measurement speed: 0.3 mm / second, cut-off value: 0.8 mm, tilt correction, straight line correction, and cut-off ratio 300, The arithmetic average roughness Ra of the roughness curve was determined. The measurement was performed at any 10 locations on the surface of one sample, and the median value (Median) was defined as the surface roughness Ra of the sample.

<Measurement of charged body potential>
Wherein each of the embodiments, the body charging potential P _H of the sample of the antistatic coating bed prepared in Comparative Example were measured by the measuring method described above. For the measurement, a human body electrometer KSD-4000 manufactured by Kasuga Electric Co., Ltd. was used.
Body charging potential P _H as 30V following the antistatic function very well as (◎), 30V good antistatic function those following 50V exceeded (○), those in excess of 50V antistatic malfunction (×) evaluated.

<Evaluation of beauty>
The 60 ° glossiness of the surface of the antistatic coated floor sample prepared in each of the examples and comparative examples was measured using a gloss meter [PG-1 manufactured by Nippon Denshoku Industries Co., Ltd.]. The measurement was carried out at any 10 locations on the surface of one sample, and the median value (Median) was used as the glossiness of the sample.

When the glossiness is 70 or more, the appearance is very good (）), when it is less than 70, the appearance is good (◯), and when it is less than 50, the appearance is poor (x). evaluated.
<Leakage resistance measurement>
The leakage resistance value of the surface of the antistatic coated floor sample produced in each of the above Examples and Comparative Examples was measured by the measurement method described above. As the insulation resistance meter, a resistance meter tera ohm meter manufactured by Midori Safety Co., Ltd. was used.

"Comprehensive judgment"
The case where the human body charging potential and the cosmetic appearance were both ◎ was very good (◎), at least one was ○ (good), and at least one was bad (×). As evaluated.
The above results are shown in Tables 1 to 3.

From the results of Examples 1 to 9 and Comparative Examples 1 to 3 in Tables 1 to 3, the surface roughness Ra of the outermost surface of the antistatic coating floor is 0.1 μm or more by blending acrylic beads with the cast floor coating material. In the range of 0.5 μm or less, the contact area between the outermost surface and the shoe sole of the operator is reduced while maintaining the good appearance and beauty of the antistatic coated floor. can reduce the charging potential P _H, that is, the antistatic coating bed, it was found that can impart excellent antistatic function.

Moreover, in order to obtain the antistatic coating floor which has the said favorable characteristic from the result of Examples 1-9, the mixture ratio of an acrylic bead is the range of 6 to 50 mass parts per 100 mass parts of epoxy resins. Among them, it was found that the leakage resistance value is preferably in the range of 2.5 × 10 ⁴ Ω or more and less than 1 × 10 ⁹ Ω.
Furthermore, from the results of Examples 1 to 9, in order to obtain an antistatic coated floor having particularly excellent properties, the surface roughness Ra is 0.11 μm or more and 0.45 μm or less, particularly 0. It was found that it is preferable to set the thickness within a range of 30 μm or less.

Claims (3)

Ba Inda resin, conductive agent, and a resin composition comprising an acrylic bead, comprising at least a layer located on the outermost surface, the surface roughness Ra of the outermost surface 0.1μm or more, is 0.5μm or less An antistatic coated floor characterized by that.   The antistatic coated floor according to claim 1, wherein the blending ratio of the acrylic beads in the resin composition is 6 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the binder resin. The antistatic coated floor according to claim 1 or 2, wherein the leakage resistance value is 2.5 x 10 ⁴ Ω or more and less than 1 x 10 ⁹ Ω.