JPH03161501A - Production of glove having electrical insulation property - Google Patents

Abstract

PURPOSE:To obtain a water-proof glove free from leakage and filling of a cloth glove and having electrical insulation property by adding a coagulating agent to cloth gloves, dipping the cloth glove into a foamed rubber latex to form a coagulated layer and further forming a solid rubber coating film thereon. CONSTITUTION:A coagulating agent 2 is added to a cloth glove 1 to form a coagulated layer 2 and then the cloth glove is dipped into a formed rubber latex to form a coagulated layer of foamed rubber latex thereon. Then the treated cloth glove is dipped into a rubber latex consisting of 35-65wt.% natural rubber latex and isoprene rubber latex (e.g. polymer latex obtained by polymerizing using a SNASM based polymerization catalyst and composed of 92-98% cis 1.4 structure and 2-8% trans 3.4 structure) to form a solid rubber coating film 3 and dried to provide the aimed glove having electrical insulation property.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing an electrically resistant glove, and more particularly to a method for manufacturing an electrically resistant glove with cloth and having waterproof properties.

<Prior Art> Electrical resistance gloves are used as gloves for working on electrical circuits. Gloves for working on electrical circuits usually meet the following requirements:

(a) It should be easy to pick and pull parts with your fingertips.

(b) Be waterproof.

(Cl always has scales to prevent electric shock etc.

In order to meet the requirements of (111) above, a soft material should be used and made thin, and in order to meet the requirement of (b), a step of immersing it in rubber latex during the manufacturing process should be adopted,
In order to form a seamless film on the entire surface and to satisfy the requirement (C), it is necessary that the electrical resistance does not decrease even in water. Conventionally, in an attempt to embody the requirement (a) above, there has been a method in which a thin layer of rubber latex is applied to the entire surface of gloves made of stockinette-knit stretchable fabric. In an attempt to materialize the requirements of (Q), a method in which a seamless coating is applied to the entire surface by dipping it in latex, while also considering the requirements of (a). Methods using latex, chloroprene rubber latex, styrene-butadiene copolymer rubber latex, etc. have been considered and implemented.

<The invention tries to solve i! ￥Title> However, the said fan. The method of realizing the requirement (b) had the following drawbacks.

Cloth gloves made of stockinette stretch fabric have fairly large stitch holes. If this is applied to a hand mold and dipped in latex, leakage of the latex is inevitable. Latex leakage inhibits the elasticity of cloth gloves, increases bending resistance during use, and significantly impairs the workability of rubber gloves.

In particular, when general work gloves are coated on a hand pattern, there are holes of at least 0.3 to 0.5 gm in mesh, and it is inevitable that pinholes will occur in the latex coating itself.

It is because of this problem that it has been difficult to put waterproof rubber gloves with cloth made by the latex dipping method into practical use.

Furthermore, the method for realizing the requirements for Cl has the following drawbacks.

Chloroprene rubber latex has a strong coating after being cast and dried even without the addition of reinforcing agents, and the latex itself is stable and easy to handle, but it is expensive. In order to strengthen the dried film, it is necessary to add a large amount of reinforcing agent, etc. As a result, the stability of the latex deteriorates and it becomes difficult to handle.
The coating had good appearance, but it also had drawbacks such as hardness.

On the other hand, natural rubber latex has a strong coating after being cast and dried even without the addition of reinforcing agents, the latex itself is stable, it is easy to obtain a coating with a good appearance, and the resulting coating is also flexible. It is the most commonly used because it has many advantages such as not being very expensive.

Although natural rubber latex has many features as mentioned above, when it is applied to gloves for working on electrical circuits as a compound using commonly used rubber latex compounding agents, it has poor electrical resistance in water. There was a tendency for this to occur, and there was a risk of electrocution.

The present invention aims to solve the problem of not leaking or sealing the eyes of cloth gloves by forming a thin natural rubber coating using a latex dipping method, and also to impart IT conductivity in water to this natural rubber coating. .

Means for Solving the Problems> In order to solve the above problems, the present invention includes a cloth glove covered with a hand shape containing a coagulating agent, and immersing the coagulant in foamed rubber latex to form the outer surface of the cloth glove. After forming a coagulated layer of foamed rubber latex, it is immersed in a rubber latex consisting of 35-65% by weight natural rubber latex and 65-35% by weight isoprene rubber latex to form a solid rubber coating on the outer surface. The present invention provides a method for manufacturing an electrically resistant glove characterized by drying the glove.

The isoprene rubber latex has a cis 1.4 structure of 92 to 98%, which is obtained by polymerizing isoprene monomer with a polymerization catalyst such as an alkyl lithium type, an alkyl aluminum/titanium tetrachloride type, or a SNAM type using an aluminum hydride derivative instead of the alkyl aluminum. , transformer 3
- A polymer latex consisting of 8-2% of 4 structures is used.

For isoprene rubber latex, compounding agents normally used for natural rubber latex are used.

However, because the chemical stability is somewhat lower than that of natural rubber latex, anionic, cationic, or amphoteric stabilizers are used. For example, sodium alkylnaphthalene sulfonate, KOH1 ammonium casein, etc. are often used.

In order to obtain a blended rubber latex consisting of natural rubber latex and isoprene rubber latex, first, the compounded isoprene rubber latex containing the required compounding agents for rubber latex is stabilized with the above-mentioned stabilizer. It is desirable to add the compounded natural rubber latex containing the required rubber latex compounding agents little by little to the compounded isobrene rubber latex while stirring. If this order is reversed, the soap in the isoprene rubber latex may be removed, causing thickening or gelation, so care must be taken.

The blended rubber latex thus obtained can be uniformly cast onto the surface of other articles, or coated by a dipping method, molded into an appropriate shape, dried, and vulcanized to form a rubber coating. However, in order to obtain proper vulcanization, proteins,
Since it does not contain non-rubber components such as lecithin and amino acid resins, it is necessary to add slightly more vulcanization accelerator, vulcanization activator, anti-aging agent, etc. As the vulcanizing agent, sulfur or a tetramethylthiuram compound is used, and the latter imparts heat resistance.

By carrying out the above manufacturing method, a rubber product that is electrically resistant even in water can be obtained, but in order to further ensure or improve this property, a water washing step must be provided.

By the water washing step, hydrophilic substances such as soap and casein in the latex molten material can be eluted, and the electrical resistance can be further improved.

This water washing step can be carried out either before vulcanization or after vulcanization. The former case is more efficient, but if the shape of the carved object is complex, there is a risk of it losing its shape, and the latter case, although there is no risk of losing its shape, is not efficient and takes a long time to wash. Become.

Therefore, one of the methods is selected depending on the shape of the precept. Note that some hydrophilic substances slightly inhibit proper vulcanization of isobrene rubber, so the latter is preferable from the viewpoint of obtaining proper vulcanization.

EXAMPLE> A case will be described in which low-pressure electrical rubber gloves (hereinafter referred to as "rubber gloves") used for working on electrical circuits with an AC voltage of 300 V or less are manufactured.

In addition, in order to avoid electric shock accidents even if the gloves worn by workers are wet when working on electrical circuits, rubber gloves should be used at a charging current (60 Hz) at an interelectrode voltage of 750 ■ in the underwater test described below. ) must be at least 10.0 mA or less, so this value was targeted in this embodiment.

First, as shown in FIG. 1, a stockinette-knitted glove (1) of cotton thread count 40 as shown in FIG. 2 was placed over a wooden hand pattern (4). Here, the dimensions (m) of each part of the glove (1) shown in FIG. 2 were as shown in the table below.

1. The dimensions of each part, excluding thickness, are based on the table above, and the tolerance is ±IOX.

2. The thickness of the finger (r.J.K.L.M') is set at the center of the finger.

3. Dimensions marked with * indicate dimensions when flattened.

This glove (No. 11) was immersed in a coagulant solution of 50% calcium nitrate in methanol, dried by placing it in a 70'c drying chamber for 15 minutes, and left at room temperature for 10 minutes. 3.5 to 4.0 times the foam) for 1 minute and then pulled out.

Natural rubber latte lyy. (Solid content 60%) 1
00 Part by weight f 5A vulcanizing agent dispersion" 10
・50X NONOXWSL emulsion 0 1
〃BELEX TA”” 2 〃1
0! 'lponin water? liquid
10 〃Book: Tetramethylthium radical sulfide 15 〃Zinc white
15〃Activated tetramethylthium radical sulfide
5 Zinc carbamate
5 Destroying agent and water 56
〃 *Book: I. C. Product name of I (USA) o*: Product name of Kao Ichi Sialkyrus 11 Sodium cat succinate When the latinx compound is foamed on the surface of the cloth gloves, 0. It forms a coagulated layer (2) with a thickness of about 5 am, and the unsolidified foamed latex is pulled up with it stuck to it, so the unsolidified foamed latex can be blown away with air or washed off with a water shower. or immerse it in water to remove it. The cloth glove (1) covered with the hand pattern (4) is stretched to a certain extent to make it fit well with the hand pattern, so the stitches are open and the stitches are at least 0.3 to 0.3 inches wide.
The holes are approximately 5 m in diameter, with some holes being larger depending on the location. When immersed in ordinary mixed latex, the water pressure causes the latex to leak all over the surface and penetrate into the back of the cloth gloves, not only worsening the feel of the cloth gloves, but also crushing the stitches of the gloves, increasing bending resistance and reducing flexibility. However, in this example, the foamed latex coagulated layer (2) exists in a state that bridges the stitches of the cloth glove (1), and there is no place where the foamed latex coagulated layer (2) penetrates from the hole of the stitch to the back of the cloth glove. Ta. Foamed latex coagulation N (2)
The thickness of the sample is adjusted by adjusting the dipping time.The sample is immersed in the blended rubber latex for 10 seconds twice and pulled up.

Nll Nu2 Port3 Inhibition4 Nu5 Thiuram-based vulcanized decomposer Berefux SSL ” Wax dispersion (solid content 50χ) Antifoaming agent 00 Water 11 11 11 111 111 0.1 0.1 0.1 27 27 27 This book The examples are expressed in terms of solid content to make it easier to understand. ** 73 Kyldiphenyl ether disulfonic acid 0lium manufactured by Kao *** Product name KM71 Silicone Emalun manufactured by Igon-etsu Chemical Industry Il@ Initially, a solid rubber film (3) with a thickness of 0.4-0.5+n is formed on the surface of the foamed latex coagulation layer (2) due to the effect of the coagulant contained in the cloth glove.

If it is desired to supplement the coagulant, the coagulant may be applied to the surface of the foamed latex coagulated layer by dipping it in the coagulant solution again and drying it, but normally this step is unnecessary. Then, the temperature is raised to 100°C in stages to dry it.

Next, it was vulcanized for 50 minutes in an indirect vulcanizer at 100°C,
After cutting out the mold, first wash the manufactured gloves using formulations 1 to 5 under the best possible washing conditions, for example, in water at 75°C for 3 hours (such washing is hereinafter referred to as "secondary extraction"). )
After that, after drying in a drying room at 70°C for 6 hours, JIS
Using the test equipment described in T8010-1979.4,
After soaking each glove in water for 2 to 6 hours, it was pulled out and immediately charged with a charging current (the voltage between the electrodes was 750 V AC (60 Hz)).
was measured and the results are shown in Table 1. Next, Table 2 shows the results of examining the influence of washing conditions by changing the secondary extraction conditions for gloves manufactured using the M3 formulation, which is considered to be a formulation that meets the intended purpose of the present invention.

Part 1 ** × indicates that results not meeting the purpose of the present invention were obtained.

Part 2 (Effects of the Invention) In the present invention, the cloth glove covered with a hand shape contains a coagulant, and this is immersed in foamed latex, so that the latex coagulates on the outer surface of the cloth glove with a foam structure. do. That is, a solidified layer of foamed rubber is formed. This coagulated layer is created by: (1) the hand mold is immersed in the foam, so unlike normal liquid latex, the water pressure is low, so there is no leakage, and (2) the foam structure of the latex is difficult to penetrate into the pores. Due to its properties, it will not leak. In this way, even if there is a hole in the mesh of about 0.3 to 0.5 u, the coagulated layer of foam rubber will not leak, so it will not impede the elasticity of the cloth glove and will improve the quality of the product. Flexibility and workability are maintained. At the same time, the coagulated layer acts as a seal for the rubber latex that is then dipped, eliminating the fear of pinholes occurring in the solid rubber coating, so it is not necessary to form the solid coating thicker than necessary for safety reasons. This contributes to improved flexibility and workability. Since the outer solid rubber coating is created by dipping in latex, it can be formed thinly. In addition, because of the foam rubber layer between the cloth glove and the solid rubber coating, flexing of the solid rubber coating can be structurally cushioned, resulting in a softer-feeling rubber glove. Furthermore, the solid rubber coating is mixed with 35-65% by weight of natural rubber latex and 65-3% by weight of natural rubber latex.
It is made from a blended rubber latex consisting of 5% by weight of isoprene rubber latex, and as long as it is thoroughly washed during the process, the electrical resistance will not deteriorate even when exposed to water for a long time. Moreover, it is possible to obtain a soft electrically resistant rubber with a good surface appearance.

Because of such physical properties, the present invention can fully exhibit its effects when applied to electrical circuit work gloves for preventing electric shock.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, and FIG. 2 is a plan view of a glove used in the embodiment. ■・One cloth glove, 2-coagulated layer, 3-rubber coating, 4-hand type,
A. B. CM - - Symbol indicating the dimensions of each part.

Claims (1)

[Claims] (1) A cloth glove covered with a hand shape is impregnated with a coagulant, and the coagulant is immersed in foamed rubber latex to form a coagulated layer of foamed rubber latex on the outer surface of the cloth glove. A method for producing electrically resistant gloves, which comprises dipping the gloves in a rubber latex consisting of natural rubber latex and 65 to 35% by weight of isoprene rubber latex to form a solid rubber film on the outer surface and drying the gloves.