JP6989952B2 - Concentrated antistatic agent and antistatic method - Google Patents

Description

The present invention relates to concentrated antistatic agents and antistatic methods suitable for insulating materials such as plastics and glass.

Patent Document 1 describes a waste cloth made of ultrafine fibers impregnated with an antistatic treatment liquid for plastics, which comprises 0.5 to 2% of a quaternary ammonium salt and 99.5 to 98% of an isopropyl alcohol. Describes an antistatic treatment method for plastics that wipes the surface of the plastics, and an example discloses an antistatic treatment liquid containing 1% of a quaternary ammonium salt and 99% of an isopropyl alcohol.

Japanese Unexamined Patent Publication No. 9-173961

In wipe application with a waste cloth impregnated with an antistatic agent, it is possible to form an antistatic film by a simple operation while removing dust and the like from the surface to be coated when the antistatic agent is applied.

However, it is formed when an antistatic treatment liquid for plastics, which comprises 0.5 to 2% of a quaternary ammonium salt and 99.5 to 98% of isopropyl alcohol as in Patent Document 1, is used. The antistatic film has adhesiveness, which causes a problem of adhering dust and the like. For this reason, it is necessary to perform coating work in an environment where dust and the like are unlikely to adhere to the surface to be coated (in a clean room, etc.) and under conditions (painting immediately after coating, etc.), and the applicable range is extremely narrow and limited.

In addition, since the proportion of isopropyl alcohol is high, it is necessary to handle it as a liquid having extremely high flammability, which makes delivery and storage complicated in distribution as an antistatic agent.

Therefore, the first object of the present invention is to provide an antistatic agent and an antistatic method capable of easily forming an antistatic film by wipe coating.

The second purpose is to provide a concentrated antistatic agent that is easy to handle during delivery and storage.

The first object of the present invention contains a quaternary ammonium salt and a volatile solvent, the quaternary ammonium salt is 0.01% by weight or more and 0.3% by weight or less, and the volatile solvent is 99.7% by weight. It contains a quaternary ammonium salt of 99.99% by weight or less, or a quaternary ammonium salt, water and a volatile solvent, the quaternary ammonium salt is 0.01% by weight or more and 0.3% by weight or less, and water is It is achieved by an antistatic agent that is greater than 0% by weight and less than 15% by weight and the volatile solvent is greater than 84.7% by weight and less than 99.99% by weight. The volatile solvent includes, for example, an alcohol solvent such as isopropyl alcohol (IPA).

The antistatic agent is wipe-applied to the surface of the electrical insulator (the surface to be coated). Wipe application is to wipe the surface (surface to be coated) of the electric insulator with a cloth impregnated with an antistatic agent. By wipe application, the antistatic agent is applied to the surface to be coated and the surface to be coated is coated with the antistatic agent. Adhering dust and dirt (dust, etc.) are wiped off. Wipe application is a low-quality process that causes uneven application, and the work is extremely simple.

By applying the antistatic agent by wipe, an antistatic film having suppressed adhesiveness is formed on the surface to be coated, and suitable conductivity (antistatic property) can be easily imparted to the surface to be coated.

In the case of an antistatic agent containing water, the water component in the antistatic agent relaxes the quick-drying property, so that the antistatic agent can be easily spread on the surface to be coated at the time of wipe application, and uniform and continuous charging is performed. The preventive film can be easily formed.

A second object of the present invention is achieved by a concentrated antistatic agent containing a quaternary ammonium salt and water, wherein the total of the weight% of the quaternary ammonium salt and the weight% of water is 40% by weight or more. .. The concentrated antistatic agent may or may not contain a volatile solvent.

The total of the weight% of the quaternary ammonium salt and the weight% of water is 40% by weight or more, and the ratio of the components other than the quaternary ammonium salt and water is always less than 60% by weight. Therefore, when the concentrated antistatic agent contains a quaternary ammonium salt, water, and an alcohol-based solvent (for example, IPA), the proportion of the alcohol-based solvent is always less than 60% by weight. Therefore, it can be a concentrated antistatic agent that can be easily handled during delivery, storage, and the like.

The quaternary ammonium salt is 0.01% by weight or more and 0.3% by weight or less, the water is more than 0% by weight and less than 15% by weight, and the volatile solvent is more than 84.7% by weight and 99.99% by weight. By adding a volatile solvent to the concentrated antistatic agent of the present invention to dilute it so that it becomes an antistatic agent of less than%, and wiping the obtained antistatic agent onto the surface of the electric insulator, the present invention is made. The first object of the invention is achieved.

According to the present invention, it is possible to easily form an antistatic film having suppressed adhesiveness by applying a wipe. In addition , it can be easily handled during delivery and storage.

It is a figure which shows an example of the quaternary ammonium salt used in this invention. It is a figure which shows the result of the electrostatic adhesion experiment. It is a figure which shows the measurement result of the surface resistance value of the inner surface (antistatic agent application surface) of the PP case used for the electrostatic adhesion experiment. It is a figure explaining the procedure of a cotton dust adhesiveness experiment, (a) is a state in which a PP sheet in which an antistatic agent was applied to each of 5 areas, and (b) is a state where a PP sheet is set in the bottom of a box. , (C) show a state in which cotton dust is injected. It is a photograph which took the coating area of each antistatic agent concentration (% by weight). It is an enlarged photograph of a coating area where residual adhesive dust is present. It is a figure which shows the difference in electrostatic adhesion due to the difference in the amount of water blended and the relative humidity. It is a figure which shows the result of having evaluated the oil solubility with the IPA / water mixed solution which changed the water | mixing amount.

The antistatic agent according to the first embodiment of the present invention contains a quaternary ammonium salt and a volatile solvent, and the ratio of each component of these is 0.01% by weight or more for the quaternary ammonium salt. 3% by weight or less, volatile solvent is 99.7% by weight or more and 99.99% by weight or less. Further, the antistatic agent according to the second embodiment of the present invention contains a quaternary ammonium salt, water and a volatile solvent, and the ratio of each component of these is 0.01 weight by weight of the quaternary ammonium salt. % Or more and 0.3% by weight or less, water is more than 0% by weight and less than 15% by weight, and volatile solvent is more than 84.7% by weight and less than 99.99% by weight. The difference between these two embodiments is whether or not the antistatic agent contains water. The volatile solvent is, for example, an alcohol solvent, and isopropyl alcohol (IPA) is used in this embodiment. In the following, the case where IPA is used as the volatile solvent will be mainly described, but the volatile solvent contained in the antistatic agent and the concentrated antistatic agent of the present invention is not limited to IPA, and other alcohol-based solvents are used. Or a non-alcoholic solvent may be used.

That is, the antistatic agents of the first and second embodiments have a quaternary ammonium salt concentration in the antistatic agent of 0.01% by weight or more, which is a lower limit having an antistatic effect, and have low adhesiveness. It is in the range of 0.3% by weight or less, which is the upper limit concentration. The antistatic agent forms a conductive antistatic film on the surface of the insulating material. The quaternary ammonium salt, which is a surfactant, is used as the antistatic film, and the hydrophobic part is an antistatic material such as plastic. The hydrophilic part adsorbs moisture in the air to form an antistatic surface having weak conductivity.

The concentrated antistatic agent according to the embodiment of the present invention contains a quaternary ammonium salt and water, and the total of the weight% of the quaternary ammonium salt and the weight% of water is 40% by weight or more.

The antistatic method according to one embodiment of the present invention is applied to the concentrated antistatic agent of the present embodiment (concentrated antistatic agent in which the total of the weight% of the quaternary ammonium salt and the weight% of water is 40% by weight or more). By adding a volatile solvent (for example, IPA) and diluting, the antistatic agent of the second embodiment (quaternary ammonium salt is 0.01% by weight or more and 0.3% by weight or less, water is less than 15% by weight). , Antistatic agent with a volatile solvent of more than 84.7% by weight and less than 99.99% by weight), and the obtained antistatic agent is wipe-applied to the surface (coated surface) of the electrical insulator. .. In other words, the concentrated antistatic agent used in the antistatic method of the present embodiment has a total of 40% by weight or more of the weight% of the quaternary ammonium salt and the weight% of water, and is diluted by adding a volatile solvent. By doing so, it becomes an antistatic agent of the second embodiment.

The quaternary ammonium salt used in the present embodiment (each of the above embodiments) is preferably used for adjusting the resistance value of the coating material and adjusting the surface tension, and for example, the one shown in FIG. 1 is used.

In the formula of FIG. 1, R ₁ and R ₂ are independently alkyl groups having 1 to 16 carbon atoms, and m and n are independently integers of 1 to 10.

A large number of quaternary ammonium salts have been put on the market, and there are many suitable varieties other than those presented in this embodiment. In particular, when it is used as a pretreatment for painting, it is preferable to select from those used for paint, and it is possible to flexibly deal with it by mixing and using several varieties.

In particular, when a paint maker or a paint maker presents requirements, it is possible to make a custom-made product within the scope of the present invention by discussing the blending amount, water blending amount, concentration ratio, etc. with the quaternary ammonium salt variety. ..

From the viewpoint of antistatic effect, it is advantageous that the concentration of the quaternary ammonium salt in the antistatic agent is high. For this reason, for example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 9-173961), the concentration range of the quaternary ammonium salt is set to 0.5% by weight to 2% by weight. However, the antistatic film obtained by applying an antistatic agent (wipe coating) to a quaternary ammonium salt has an adhesive property and has a problem of adhering dust and the like. Therefore, as in Patent Document 1, the quaternary ammonium salt is applied. When an antistatic agent having a high concentration of ammonium salt is used for pre-painting treatment, it is necessary to apply the antistatic agent in a clean environment such as a clean room immediately before painting in a dust-free environment and immediately paint.

On the other hand, since the antistatic agents of the first and second embodiments have both antistatic and low adhesive properties as described above, they have a dust adhesion suppressing performance (dust, etc.) for a long period of time after application. It has the ability to suppress electrostatic adhesion and adhesive adhesion), and continues to exhibit the dust adhesion suppression performance required by antistatic agent application. For example, when the antistatic agent of the present embodiment is applied to the pre-painting treatment, the antistatic agent can be applied immediately after molding the material or immediately after unpacking the material because there are no restrictions on the clean coating environment and the pre-painting time. It suppresses the adhesion of dust even during the period of several days or weeks until painting, reduces the amount of dust adhering, and facilitates the removal of dust by air blowing or wiping work immediately before painting.

Further, in the case of an antistatic agent consisting only of a quaternary ammonium salt and isopropyl alcohol as in Patent Document 1, the quick-drying property of the antistatic agent is too high to spread the antistatic treatment liquid uniformly, or the humidity is low. Sometimes it takes time to adsorb water to the antistatic film, and the antistatic effect is reduced.

On the other hand, in the antistatic agent of the second embodiment, since the addition of water can adsorb water to the antistatic film from the beginning, it contributes to the immediate effect of the antistatic effect especially in low humidity. Further, the addition of water has the effect of slowing the evaporation rate of IPA and improving the workability of applying the antistatic agent. Considering the immediate effect of the antistatic effect under low humidity and the coating workability by relaxing the evaporation rate, the weight% of water in the antistatic agent is preferably 1% or more. When the ratio of the quaternary ammonium salt in the antistatic agent is 0.01% by weight or more and 0.3% by weight or less and the ratio of water is 1% or more and less than 15% by weight, the ratio of the volatile solvent is It exceeds 84.7% by weight and becomes 98.99% by weight or less.

Further, the antistatic agent of the present embodiment contains IPA in the range of 99.7% by weight or more and 99.99% by weight or less, or more than 84.7% by weight and less than 99.99% by weight. , IPA exhibits excellent material cleaning effect with excellent wettability and oil solubility due to its low surface tension, but it is required to be handled as a flammable liquid (dangerous goods class 4 alcohols) with extremely high flammability. , Delivery and storage are complicated.

In order to eliminate such complexity, in the present embodiment, a concentrated antistatic agent having a total of 40% by weight or more of the weight% of the quaternary ammonium salt and the weight% of water is manufactured for delivery and storage, and wiped. Before the coating work, IPA, which is most commonly used for material cleaning work, is added to the concentrated antistatic agent to dilute it, so that the antistatic agent for wipe coating (the antistatic agent of the second embodiment). To get. Since the total of the weight% of the quaternary ammonium salt and the weight% of water is 40% by weight or more, the IPA concentration is always less than 60% by weight even when IPA is included in the concentrated antistatic agent, and alcohols are used. It is a concentrated antistatic agent for non-dangerous goods that is not classified as dangerous goods.

Specifically, the quaternary ammonium salt forming the antistatic film is dissolved in water (or a solution of water and IPA), and the IPA concentration (isopropyl alcohol concentration) is less than 60% by weight (including 0%). It is a non-hazardous water-blended concentrated antistatic agent. At sites where antistatic agents are used (for example, sites where pre-painting is performed), it is easy to obtain and stockpile IPA for cleaning work together with solvent-based paints and thinners, and the above-mentioned concentrated antistatic agent should be added to IPA. This makes it possible to obtain the antistatic agent of the present embodiment.

For example, a concentrated antistatic agent is produced by diluting the quaternary ammonium salt with a solution having an IPA concentration of 50% and water of 50% so that the weight% of the quaternary ammonium salt is 2%. At the site where the product is used, the concentrated antistatic agent is diluted 10-fold with IPA (100% product). By this dilution, an antistatic agent having a composition in which the weight% of each component is 0.2% in a quaternary ammonium salt concentration, 4.9% in a water content, and 94.9% in an IPA content can be obtained.

Concentrated antistatic agents for non-dangerous goods (concentrated antistatic agents containing water) can be easily stored and delivered to the site where the antistatic agent is used by a simple method, so that the container cost and manufacturing cost -Distribution costs and storage costs can be reduced, improving convenience for all manufacturers, distributors, and users.

[Dust adhesion suppression effect, antistatic effect]
The dust adhesion suppressing effect, which is the result of the present invention, is quantitatively measured by the electrostatic adhesion experiment and the cotton dust adhesiveness experiment, and the antistatic effect, which is the factor system, is the surface resistance value of the antistatic agent coated surface. Was measured. The antistatic agent applied to the surface to be coated in each experiment does not contain any components other than the quaternary ammonium salt, water and IPA.

(Electrostatic adhesion experiment)
In the electrostatic adhesion experiment, the electrostatic adhesion of expanded polystyrene beads (average particle size of about 6 mm, hereinafter abbreviated as "beads") to a polypropylene A4 size document storage case (hereinafter abbreviated as "PP case") was measured. .. All measurements were performed in an environment with a temperature of 20 ° C. and a relative humidity of 45%. The specific measurement procedure is shown below.
(1) Spread 0.5 g of antistatic agent on the upper surface, lower surface, and side surface (total area of about 1900 cm ² ) of the inner surface of the PP case with tissue paper.
(2) Put 1 g (about 300) of beads into the PP case and close the case.
(3) Shake the PP case 100 times in 30 seconds, stand the PP case, collect the beads in one corner, and then set it on the tilting table so that the beads are on top.
(4) Tilt the tilting table from 0 ° (horizontal lodging) to 90 ° (vertical standing) at a speed (angular velocity) of 1 ° per second, and record the angle at which all the beads fall.

In the above procedure, from no antistatic agent (no antistatic agent applied (quaternary ammonium salt concentration 0%)) to quaternary ammonium salt concentration 5%, the quaternary ammonium salt concentration (weight) of the antistatic agent to be applied. %) Was gradually increased, and the tilt angle at which all the beads fell (the total fall tilt angle of the beads) was measured for each concentration antistatic agent.

As a result of the measurement, as shown in FIG. 2, the inclination angle is 90 ° until the quaternary ammonium salt concentration reaches 0.01% (while the quaternary ammonium salt concentration is less than 0.01%). When the number of beads that do not fall even when the salt reaches (stands vertically) remains, and when the quaternary ammonium salt concentration is 0.01% or more, all the beads fall and the effect of suppressing electrostatic adhesion is recognized. It has been found. Then, an excellent electrostatic adhesion suppressing effect was confirmed in which all beads fell at an inclination angle of 10 ° or less at a concentration of 0.1% or more, and this effect was almost the same up to a concentration of 5%. That is, it was confirmed that even if the concentration of the quaternary ammonium salt is less than 0.5%, the effect of suppressing electrostatic adhesion is obtained. In addition, until the quaternary ammonium salt concentration reaches 0.01%, beads that do not fall even if the inclination angle reaches 90 ° remain (there is no total falling angle of the beads), so in FIG. 2, FIG. Total drop tilt angle of beads corresponding to each concentration less than 0.01% (0%, 0.001%, 0.002%, 0.004%, 0.004%, 0.006% and 0.008%) Is plotted and displayed at a position of 100 ° for convenience.

Next, the surface resistance value of the inner surface (antistatic agent coated surface) of the PP case used in the electrostatic adhesion experiment was measured by the following procedure.
(1) Open the PP case.
(2) Surface resistance measurement Double ring electrode (JIS K6911 compliant) is crimped onto the inner surface of the PP case with a load of 2 kg.
(3) Measure the resistance value in the 5000V application mode of a super-insulated resistance meter (KEW3125A manufactured by Kyoritsu Electric Meter), multiply it by 6π, and convert it to the surface resistance value (GΩ / □).

As a result of the measurement, the graph of FIG. 3 was obtained. The high surface resistance value of 4 teraΩ / □ without antistatic agent (uncoated) drops to 1.7 teraΩ / □ after application of antistatic agent with a quaternary ammonium salt concentration of 0.01%. It was confirmed that the surface resistance value of was negatively correlated with the concentration almost linearly. Further, it was found that the surface resistance value was on the order of gigaΩ of 1 tera Ω or less in the region where the quaternary ammonium salt concentration was 0.1% or more, which was highly effective in suppressing electrostatic adhesion. Furthermore, the change in surface resistance was continuous even when the quaternary ammonium salt concentration was less than 0.5%, and measurement results supporting the electrostatic adhesion experimental results were obtained.

(Cotton dust adhesiveness experiment)
In the cotton dust adhesiveness experiment, an antistatic agent was applied to a black polypropylene sheet (hereinafter abbreviated as "PP sheet") 1 and the cotton dust was sprayed on the black polypropylene sheet (hereinafter abbreviated as "PP sheet") 1 so that the cotton dust adhesion status could be easily confirmed. It was wiped off and the remaining adhesive cotton dust was photographed.

As shown in FIG. 4A, one antistatic agent is applied so that each coating area 2 has a width of 25 mm and a length of 60 mm at an application pressure and application speed suitable for the actual application of the antistatic agent. The concentration of the antistatic agent (% by weight of the quaternary ammonium salt) was changed in 5 places (5 coating areas 2 in FIG. 4A) with respect to the PP sheet 1 of the above. The concentration of the quaternary ammonium salt of the antistatic agent was changed in the range of 0.01% by weight to 5% by weight.

To spray cotton dust, set the PP sheet 1 coated with the antistatic agent on the bottom of the box 3 as shown in FIG. 4 (b), close the box 3, and cut the cotton as shown in FIG. 4 (c). Bag 4 was compressed 200 times and cotton dust was injected from above the box 3. After injecting the cotton dust, let it stand for 30 minutes, then remove the PP sheet 1 from the box 3, wipe off the cotton dust from the PP sheet 1 (coating area 2) with an air blow, and illuminate the remaining cotton dust with oblique light (a low angle of several degrees). I took a picture with the lighting in. A photograph of the coating area 2 for each concentration is shown in FIG. 5, and an enlarged photograph of the coating area in which residual adhesive dust is present is shown in FIG. The white streaks in FIG. 6 are antistatic films.

From the cotton dust adhesiveness experiment, it was found that the adhesion of cotton dust is remarkable in the region where the quaternary ammonium salt concentration is 0.4% by weight or more, and the adhesion of cotton dust is suppressed when the quaternary ammonium salt concentration is 0.3% by weight or less. ..

[Effects of adding water to antistatic agents and concentrated antistatic agents containing IPA]
The effects of adding water to the antistatic agent component in which a quaternary ammonium salt is dissolved in IPA are mainly the following three.

The first effect is to make the concentrated antistatic agent non-hazardous by setting the IPA concentration to less than 60% by weight. IPA is a Dangerous Goods Class 4 alcohol, but if it is a concentrated antistatic agent for non-dangerous goods that is not classified as a dangerous goods due to the combination of water, it will not be necessary to handle it as a dangerous goods in delivery or storage.

The second effect is the quick-drying relaxation of IPA. The wiping work with an antistatic agent also serves as degreasing and cleaning work of the material, and at the same time, a liquid film of the antistatic agent is formed to obtain a hydrophilic quaternary ammonium film. However, with an antistatic agent composed only of IPA and a quaternary ammonium salt, the quick-drying property of IPA often hinders these workability. Therefore, a method of adding a slow-drying solvent to alleviate the quick-drying property of IPA is adopted, but water exhibits an excellent effect of alleviating the quick-drying effect of IPA. A quaternary ammonium salt 0.2% by weight IPA solution containing water in the range of 2% by weight to 5% by weight was prepared, wiped against the polypropylene material, and the drying time of the liquid film was measured. As a result, the liquid film drying time was 9 seconds without water compounding, and 13 seconds to 14 seconds with 2% by weight to 5% by weight of water compounded, and workability was improved by extending the liquid film drying time by about 50%. The effect was confirmed.

The third effect is to suppress a decrease in the antistatic effect at low humidity. The antistatic effect of the quaternary ammonium salt is obtained by forming a hydrophilic continuous film on the surface of the hydrophobic material and adsorbing water molecules in the air to obtain weak conductivity. However, at low humidity, it takes time to adsorb water molecules from the air, and the antistatic effect is reduced immediately after the application of the antistatic agent. On the other hand, by blending water as a component of the antistatic agent, the hydrophilic film of the quaternary ammonium salt is formed and at the same time, the blended water is adsorbed, so that the antistatic effect can be exhibited even immediately after application.

Prepare a quaternary ammonium salt 0.2% by weight IPA solution containing water in the range of 0% by weight (no water mixture) to 5% by weight, and apply immediately after application at a relative humidity of 45% and at a relative humidity of 30%. Immediately after, and 1 hour after application at a relative humidity of 30%, the above-mentioned electrostatic adhesion experiment was performed. As a result, as shown in FIG. 7, the relative humidity was 30% in the range of 2 to 5% by weight of water. It was found that the electrostatic adhesion in the case of 45% and the electrostatic adhesion in the case of 45% were substantially the same. In addition, when the relative humidity was 30%, the total drop inclination angle of the beads immediately after application decreased to 30 ° without water blending, but the antistatic effect was restored to 11 ° after 1 hour, and water blending 2 to 5 It was found to be substantially equivalent to the weight% antistatic agent.

Further, in the above-mentioned electrostatic adhesion experiment immediately after application at a relative humidity of 30%, when the water content is 0.1% by weight, 0.5% by weight, 1% by weight, and 1.5% by weight, respectively. The total drop inclination angle of the beads was measured. The total drop inclination angle of the beads at each water mixing ratio was equivalent to 2% by weight at 1% by weight and 1.5% by weight (the total drop inclination angle of the beads was 10 ° or less in each case), but 0.5 weight. In%, the total drop inclination angle of the beads decreased to 15 °, and in 0.1% by weight, it decreased to 20 °. From the above results, it was found that the mixing ratio of water is preferably 1% by weight or more in consideration of the immediate effect of the antistatic effect under low humidity and the coating workability by relaxing the evaporation rate.

There is an upper limit to the amount of water to be added, and if it exceeds 15% by weight, the oil solubility of IPA will be lost and degreasing, which is essential for cleaning materials, will not be possible. Therefore, the appropriate amount of water to be blended is less than 15% by weight.

FIG. 8 shows the results of evaluating the oil solubility with the IPA / water mixed solution in which the water content was changed. In the oil solubility evaluation, 0.04 g of oil (mixed oil of corn oil and sesame oil) was added dropwise to a 2 g mixture, the mixture was vigorously stirred, and the mixture was allowed to stand for 1 hour, and then the dissolution status of the oil was recorded. The results are "dissolved (without oil separation)", "separate sedimentation (separated oil precipitates because the specific gravity of the mixed solution is lower than the oil specific gravity up to 40% of water mixture)" and "separate floating (mixed liquid specific gravity of 60% or more of water mixture)". Is higher than the oil specific gravity, and the separated oil floats) ”. As is clear from the results, it was found that the upper limit of the water content was 14% by weight (the range was less than 15% by weight).

Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the essay and the drawings which form a part of the disclosure of the present invention according to the above embodiment. That is, it should be added that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are of course included in the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be widely used to impart antistatic properties to the surface of an electrical insulating material without giving it adhesiveness.

1: Polypropylene sheet (PP sheet)
2: Coating area 3: Box 4: Cut cotton bag

Claims (2)

A concentrated antistatic agent containing a quaternary ammonium salt and water, wherein the total of the weight% of the quaternary ammonium salt and the weight% of water is 40% by weight or more. Quaternary ammonium salt is 0.01% by weight or more and 0.3% by weight or less, water is more than 0% by weight and less than 15% by weight, and volatile solvent is more than 84.7% by weight and less than 99.99% by weight. An antistatic method in which a volatile solvent is added to a concentrated antistatic agent according to claim 1 to dilute the antistatic agent, and the obtained antistatic agent is wipe-applied to the surface of an electrical insulator.

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