JPH083544A - Water-repellent treating agent and member whose surface is subjected to water-repellent treatment - Google Patents

Abstract

PURPOSE:To obtain the water-repellent treating agent capable of obtaining a surface quite free from the adhesion of water drops thereto by coating the surface of a plastic molded product or leather, and provide the member having the water repellent-treated surface obtained by coating the surface with the water-repellent agent. CONSTITUTION:The water-repellent agent comprises 50-400 pts. of low mol.wt. ethylene tetrafluoride polymer having an average mol.wt. of 500-20000 and an average particle diameter of <=10mum and fluorinated up to the molecular end, an organic compound or organic substance, and at least one of a weathering resistant stabilizer and an antioxidizing agent. The water repellent-treated member having a water contact angle of >=140 deg.C on the surface and an electric insulation resistance of >=10<9>OMEGA-cm is obtained by treating the surface with the treating agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention does not accept water adhering to the surface of a plastic molded article and leather by coating or applying the same to the surface of the plastic molded article and leather in an initial state. The present invention relates to a water-repellent treatment agent used for maintaining and further improving electric insulation and weather resistance, and a surface water-repellent treatment member obtained by using the treatment agent.

[0002]

2. Description of the Related Art The surface treatment of plastic molded articles and leather has hitherto been carried out with oily wax, usual waterproofing agents, etc., but the surface waterproofness obtained by these treatments is not always sufficient. Without water drops on the surface,
A water film adheres, resulting in deterioration of the properties of plastic molded products and leather, which lowers the mechanical strength and lowers the insulation resistance of electrical insulators, resulting in insulation breakdown, electrical signal cross-links, electrical leaks, etc. In fact, it is happening that replacement, reprocessing and repairs have occurred.

In most cases, an insulating terminal plate or the like which is required to have electrical insulation in a plastic molded product is installed in an environment of high humidity. In this case, moisture is condensed on the surface to form a water drop. As a result, the insulation between the terminals deteriorates, causing insulation failure. Further, in the case of leather, the adhesion of water may soften the material and reduce the strength, so that the original function may not be exhibited. That is, in the fixing band or the like, the cutting failure occurs due to the decrease in strength.

[0004]

As described above, in the prior art, a water-repellent treatment agent having sufficient properties for water-repellent treatment of plastic molded articles and leather has not been obtained, so that the electrical insulating property is not improved. Deterioration, deterioration of weather resistance, deterioration of mechanical strength and the like occurred. The object of the present invention is to solve the problems that the above-described conventional art had,
To provide a water-repellent treatment agent capable of obtaining a surface free from water droplets by coating or applying the surface of a plastic molded article and leather, and coating the water-repellent treatment agent. The surface obtained by the present invention is to provide a water-repellent treated member.

[0005]

[Means for Solving the Problems] The above-mentioned object is the average molecular weight.
From 500 to 20000, an average particle diameter of 10 μm or less and 50 to 400 parts of low molecular weight tetrafluoroethylene fluorinated to the terminal part, an organic compound or an organic material, and at least one of a weather resistance stabilizer and an antioxidant And a water-repellent treatment agent having a contact angle of water on the surface of 140 ° or more and an electric insulation resistance of 10 ⁹ Ω-cm or more by the treatment with the treatment agent. It can be achieved by providing a water-repellent treatment member characterized by:

[0006]

The water-repellent treatment agent of the present invention can be easily coated or applied at a normal working environment temperature, has sufficient durability and weather resistance, and has sufficient electric insulation. The feature is that it can also be used for electric insulators and leather products that require waterproofness.

As the water-repellent treatment agent according to the conventional technique, generally, a silicone-based or fluorine-based treatment agent and a waterproofing agent such as mineral oil and vegetable oil are used. The contact angle with water is 110 ° or less, and the duration of waterproofing is 500 hours or less when used outdoors. In addition, the electrical insulation when used outdoors has a surface resistance of 10 ⁸ Ω.
It becomes less than -cm, and the water-repellent treatment effect can hardly be expected.

When the water repellent treatment agent according to the present invention is used, the contact angle with water is 145 ° or more, the electric insulation resistance on the surface is 10 ⁹ Ω-cm or more, and the duration of the waterproof treatment is for outdoor use. It has been 5 years or more, and the conventional technologies are the average molecular weight of tetrafluoroethylene, the average particle size, the organic compound / organic substance for mixing,
The blending technology and stabilizing technology for additives are completely different.

[0009]

EXAMPLES The water-repellent treatment agent and the surface water-repellent treatment member having the constitution of the present invention will be specifically described below with reference to examples.

[0010]

Example 1 200 parts of low molecular weight tetrafluoroethylene (average molecular weight 6000, average particle diameter 3.8 μm) in 100 parts of epoxy resin,
After adding 0.2 parts of an ultraviolet absorber and thoroughly mixing and stirring, an organic solvent was added to reduce the viscosity, and the mixture was applied to an electrically insulating terminal board to examine the characteristics. As a result, the contact angle with water on the surface was 145 °, the electrical insulation resistance was 10 ¹³ Ω-cm, and no abnormality was observed in the accelerated weathering test for 5 years.

[0011]

[Comparative Example 1] To 100 parts of an epoxy resin, 200 parts of tetrafluoroethylene (average molecular weight 80,000, average particle size 10.5 μm) and 0.2 part of an ultraviolet absorber were added, and after sufficiently mixing and stirring, an organic solvent was added to obtain a low viscosity. Then, it was applied to an electrically insulating terminal board and the characteristics were examined. As a result, the contact angle with water on the surface is 110.
°, electrical insulation resistance was 10 ¹³ Ω-cm, and peeling of the coating film due to water occurred in the accelerated weather resistance test for 5 years.

[0012]

Examples 2 to 5 and Comparative Examples 2 to 4 In the following, the average molecular weight of tetrafluoroethylene, the average particle diameter, the composition when the components of the coating liquid are changed, and the composition by applying the composition to an electrically insulating terminal board are shown. The results of the examination are summarized in Table 1.

[0013]

[Table 1]

From the results shown in the table, the samples of Examples 2 to 5 satisfying the requirements of the present invention show excellent characteristics in contact angle with water, electric insulation and weather resistance, and the results that should be satisfied in total are shown. Whereas, meanwhile, tetrafluoroethylene average molecular weight
It can be seen that Comparative Example 2 of 400, Comparative Example 3 having an average molecular weight of 20100, and Comparative Example 4 having an average particle size of 11 μm exhibited low values in contact angle with water, and showed poor results in terms of overall evaluation. .

When the amount of tetrafluoroethylene added is 50 parts or less, the water-repellent effect is significantly reduced, and when it is 400 parts or more, the viscosity is too high and the workability is extremely deteriorated.

[0016]

As described above, by using the water-repellent treatment agent and the surface water-repellent treatment member as the treatment agent and the treatment member having the constitution of the present invention, the problems of the prior art can be solved. To provide a water-repellent treatment agent capable of obtaining a surface on which no water droplets are attached by coating or applying the surface of a plastic molded article and leather, and the water-repellent treatment agent. It was possible to provide a surface water-repellent treated member obtained by coating the above. As a result, by applying or coating the surface of electrically insulating parts that are easily affected by water, it is possible to eliminate the effect of water and to prevent deterioration of characteristics such as leather due to water. .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeo Saito 3-9-11 Midoricho, Musashino-shi, Tokyo Inside Afty Co., Ltd.

Claims (6)

[Claims] 1. An average molecular weight of 500 to 20000 and an average particle diameter of 10 μm.
50 to 400 parts of low molecular weight tetrafluoroethylene fluorinated up to the terminal part, an organic compound or an organic material, and a weather resistance stabilizer and / or an antioxidant. Aqueous treatment agent. 2. The above organic compound or organic substance is 10 ⁹ Ω-c
The water repellent treatment agent according to claim 1, which is a substance having an electrical insulation resistance of m or more. 3. The water-repellent treatment agent according to claim 1 or 2, which has low viscosity fluidity. 4. After treating the surface of plastic or leather, the contact angle of water is 140 ° or more, and the electric insulation resistance is 10 ⁹ Ω-cm.
The above-mentioned value is shown, The water-repellent treatment agent in any one of Claims 1-3. 5. A surface of a plastic member or leather having an average molecular weight of 500 to 20000, an average particle diameter of 10 μm or less, and 50 to 400 parts of low molecular weight tetrafluoroethylene fluorinated up to the terminal end, an organic compound or an organic substance, A surface water-repellent treated member characterized by being treated with a water-repellent agent comprising at least one of a weather resistance stabilizer and an antioxidant. 6. The surface water-repellent treatment member according to claim 5, wherein the contact angle of water on the surface is 140 ° or more and the electric insulation resistance is 10 ⁹ Ω-cm or more.