JPS63273683A - Antistatic treatment agent and antistatic sheet product - Google Patents

Abstract

PURPOSE:To obtain the titled treating agent giving antistatic nature through decreasing the surface resistivity of objects, thus suitable for applying on packaging films or sheets for e.g. electronic parts, drug, by incorporating solution of antistatic agent with a water-absorptive polymer and surfactant. CONSTITUTION:The objective antistatic treating agent can be obtained by incorporating (A) a solution of antistatic agent with (B) a water-absorptive polymer (e.g., modified sodium polyacrylate) and (C) a surfactant (e.g., fluoroalkyl carboxylate). This agent is applied on plastic sheet materials to obtain the other objective antistatic sheet products (i.e., packaging materials). The amount of said antistatic agent to be added is pref. such as to be 0.01-5wt.% based on said solution, the component B being pref. 0.001-5wt.%.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention is directed to an antistatic treatment agent that reduces surface resistivity and prevents static electricity, and is used for packaging electronic material parts and chemicals, and for food and clothing. The present invention relates to plate-like materials such as films and sheets that are suitably used for display packaging and the like.

``Prior Art'' Plastic films are easily charged, and when charged, they actively attract dust, resulting in rapid surface contamination. For this reason, conventionally, the film was prevented from being charged by forming the film using a plastic compounded with an antistatic agent in advance.

``Problems to be Solved by the Invention'' However, with films made of plastic containing antistatic agents, the antistatic agent bleeds onto the film surface, and the surface resistivity value changes depending on the usage environment. Therefore, there was a problem in that the antistatic effect could not be sufficiently exerted.

Moreover, the surface resistivity value of the antistatically treated film is IQIIΩ・C11 even in good condition.
This is at a level that is insufficient to prevent electrification, and therefore cannot sufficiently prevent the adhesion of dust. For this reason, conventional antistatic treated films have a problem in that they are unsuitable for packaging of articles such as electronic material parts and pharmaceutical products that are extremely dust-free, and for display packaging of foods and clothing.

[Means for Solving the Problems] The antistatic treatment agent of the first invention is made by adding a water-absorbing polymer and a surfactant to a solution of an antistatic agent.

The antistatic agents constituting the antistatic treatment agent of the first invention include anionic antistatic agents such as fatty acid salts, higher alcohol sulfate ester salts, phosphate ester salts, ester general amines, amino general amines, Various antistatic agents widely used in the field of thermoplastic resins can be used, such as cationic antistatic agents such as quaternary ammonium salts, or nonionic antistatic agents such as ethylene Oquinde adducts and polyethyleneimine. Specific examples of antistatic agents include jetanolamine alkylphosphate, polyoxyethylene alkylamine, polyoxyethylene oleyl ether, etc. (See Pl to P53).1st
These antistatic agents may be added singly or in combination to the antistatic treatment agent of the invention. For handling reasons, it is desirable to use this antistatic agent in the form of an aqueous solution.

The amount of the antistatic agent added is desirably about 0, oi to 5% by weight based on the solution (for example, water).

If the amount of the antistatic agent added is less than the above range, charging of the object to be treated cannot be sufficiently prevented. Furthermore, if the amount of the antistatic agent added exceeds the above range, no further improvement in the antistatic effect can be expected, which is uneconomical.

As the water-absorbing polymer added to the antistatic treatment agent of the first invention, various known ones such as starch, cellulose, polyvinyl alcohol, acrylic, and crosslinked polyethylene oxide can be used.

Specific examples of the water-absorbing polymer include modified sodium polyacrylate, crosslinked sodium polyacrylate, and the like. To the antistatic treatment agent of the first invention, these water-absorbing polymers are added singly or in plural at the same time.

The amount of this water-absorbing polymer added is 0.001~
It is desirable that the amount is about 5% by weight. If the amount of the water-absorbing polymer added is less than the above range, the surface resistance of the object to be treated cannot be sufficiently reduced, and the durability of the applied antistatic treatment will decrease. Furthermore, if the amount of the water-absorbing polymer added exceeds the above range, a problem arises in that the antistatic treatment agent gels and becomes difficult to apply to the object to be treated.

A surfactant is added to the aqueous solution containing the water-absorbing polymer and antistatic agent. The surfactant lowers the surface tension of the antistatic treatment agent and improves its wettability with respect to the object to be treated, that is, the ease with which it spreads. By adding this surfactant, it is desirable that the surface tension of the antistatic treatment agent be 30 dyn/am or less. When the surface tension of the antistatic treatment agent exceeds 30 dyn/ca+,
It becomes difficult for the antistatic treatment agent to wet and spread on the surface of the object to be treated, especially a plate-like object such as a film or sheet, making it difficult to prevent the object to be electrified. The surfactants added to this antistatic treatment agent include various known fluorine-based surfactants such as fluoroalkyl carboxylates, sorbitan distearate, polyoxyethylene sorbitan monolaurate, and polyethylene glycol monostearate. can use things.

The antistatic plate of the second invention is a plastic plate whose surface is coated with the antistatic treatment agent of the first invention. Here, the term "plate-shaped object" refers to a plate-shaped article such as a film or a sheet.

Both thermoplastic resins and thermosetting resins can be used as the plastic for forming the plate-like object, but thermoplastic resins such as polyolefin resins, nylon resins, polycarbonate resins, and polyethylene terephthalate resins are preferably used. . The surface of this plate-like material is subjected to surface activation treatment such as corona treatment, if necessary.

Various methods can be used to apply the antistatic treatment agent to the plate-like object, such as brushing, dipping, roller, and spraying, but spraying is the best way to apply it thinly and evenly. Spraying, which can apply the agent, is preferably used by painting. The coating amount of this antistatic treatment agent is preferably about 0.1 to 2 g/m'', particularly about 0.1 to Ig/m''. If the coating amount exceeds the above range, the surface of the plate-like object will become sticky, and if the coating amount is below the specified range, the antistatic effect will not be sufficiently exhibited. The plate-shaped object coated with the antistatic treatment agent in this manner is subjected to a drying treatment after the coating, if necessary.

"Function" The antistatic treatment agent of the first invention, which is made by adding a water-absorbing polymer and a surfactant to a solution of an antistatic agent, has a surface tension lowered by the surfactant. When applied to a surface, it quickly wets and spreads over the surface of the object to be treated, forming a uniform thin film.

Furthermore, the water-absorbing polymer added to the antistatic treatment agent absorbs water and moderately moistens the surface of the object to be treated.
Reduces the surface resistance of the processed object.

The second coated with the antistatic treatment agent of the first invention
The antistatic plate of the invention has an extremely low surface resistance, and generated static electricity is quickly removed, so that dust adsorption due to charging can be highly prevented.

"Examples" Hereinafter, the antistatic treatment agent and antistatic plate-like material of the present invention will be explained in more detail with reference to Examples and Comparative Examples.

(Example 1) The antistatic treatment agent of the first invention was manufactured, and its composition is as follows.

Water 100 parts by weight Antistatic agent Alkyl phosphoric acid, ethanolamine 0.1 part by weight Water-absorbing polymer Modified sodium 7-acrylate 0.
03 parts by weight Fluorine surfactant 7 [Irofurkylcarboxylate 0.1 part by weight The surface tension of this antistatic treatment agent was 23 dyn/am.

This antistatic treatment agent was applied to produce an antistatic film of the second invention.

First, low-density linear polyethylene (MI, I, Og/10 min) with a density of 0.923 g/am' was heated to a temperature of 170'Ct? Inflation molded to a thickness of 20μ
Manufactured a film for Mitsugu. When the surface resistivity value of this film was measured according to JIS K 6911, it was Ω.
・It was cm.

Next, the previously prepared antistatic treatment agent was applied to this film. The antistatic treatment agent was applied by spraying the treatment agent using an ultrasonic humidifier.

After forming an extremely thin film of the antistatic treatment agent on the surface of the film in this way, the film was passed through a hot air drying zone at 80° C. to dry the antistatic treatment agent, thereby obtaining an antistatic film.

When I touched the surface of this antistatic film, there was almost no stickiness.

Subsequently, the surface resistivity value of this film was examined and found to be 10 8 Ω·cffl, which revealed that the surface resistivity could be significantly reduced by applying an antistatic treatment agent.

(Example 2) A polyethylene terephthalate film having a thickness of 23 μl was produced by the same method as in Example 1, and the same antistatic treatment agent as in Example 1 was applied to this film.

The surface resistivity value of this film was found to be 10'Ω.
・cm, and as in Example 1, it was found that the surface resistivity could be significantly reduced by applying the antistatic treatment agent.

(Comparative Example 1) Example except that no fluorosurfactant is added! A different antistatic treatment agent was created.

The surface tension of this treatment agent was 53'dyn/ca+.

This antistatic treatment agent was applied to Example 1 in the same manner as in Example 1.
When applied to a polyethylene film, the treatment agent became water droplets and did not wet and spread over the film surface.

The surface resistivity value of the treated film was measured and found to be ■Ω·cll.

(Comparative Example 2) A treatment agent was prepared that differed from the antistatic treatment agent of Example 1 in that no water-absorbing polymer was added.

Example 1 This antistatic treatment agent was applied in the same manner as in Example 1.
When applied to a polyethylene film, the treatment agent wetted and spread over the film surface.

When I touched the treated film, there was almost no stickiness, but when I measured the resistance value on the surface of this film, the resistance value was 10" Ω・cra, which is a sufficient level to prevent dust from adsorbing. was not achieved.

"Effects of the Invention" As explained above, the antistatic treatment agent of the first invention is made by adding a surfactant to an aqueous solution containing a water-absorbing polymer and an antistatic agent. It quickly wets and spreads over the surface of the object to be treated, and evenly covers the surface of the object. Moreover, the surface of the object to be treated is appropriately moistened by the moisture adsorbed by the water-absorbing polymer, thereby further reducing the surface resistance.

Therefore, according to the antistatic treatment agent of the present invention, the surface resistance of the object to be treated can be significantly reduced, the charging of the object to be treated can be highly prevented, and the adsorption of dust can be reliably prevented. Furthermore, the antifogging properties of the object to be treated can be improved.

Then, the second layer treated with this antistatic treatment agent is
The antistatic plate of the invention has extremely low surface resistance and is difficult to charge, so it hardly attracts dust and is suitable for packaging of dust-resistant items such as electronic material parts and display packaging of clothing. It is also suitable for

Claims (2)

[Claims] (1) An antistatic treatment agent made by adding a water-absorbing polymer and a surfactant to a solution of an antistatic agent. (2) An antistatic plate-like object made of plastic coated with an antistatic treatment agent made by adding a water-absorbing polymer and a surfactant to a solution of an antistatic agent.