JPS6039789B2 - Nonflammable sheet - Google Patents

Description

[Detailed description of the invention] The present invention relates to a noncombustible sheet.

More specifically, cloth, that is, organic fiber, inorganic fiber,
The present invention relates to a noncombustible sheet obtained by treating a woven fabric or nonwoven fabric made of the above or both with an aqueous dispersion of sepiolite or attapulgite (or palygorskite) and drying the treated fabric. Woven and non-woven fabrics made of organic fibers are generally flammable, so when used for clothing, interior decoration, etc., they often encourage ignition and spread of fire, resulting in loss of life and property. .

Therefore, in order to turn these into firewood, so-called scale combustion agents are mixed in, but in the event of a fire, the poisonous gas generated by the firefighting agents results in unfavorable results. . On the other hand, woven fabrics made of inorganic fibers,
Although nonwoven fabrics are nonflammable, they generally have poor flexibility.
There are limits to its use because it is brittle or has a bad texture.

In view of these circumstances, the present researchers have conducted extensive research and found that
A sheet made of cloth, that is, a woven fabric or nonwoven fabric containing organic fibers, inorganic fibers, or both, treated with an aqueous dispersion of sepiolite or attapulgite (or palygorskite) is nonflammable or flame retardant and has an excellent texture, and
We found that it is a strong axis, and based on this knowledge, we completed the present invention.

The fabric used in the present invention refers to a woven fabric or non-woven fabric made of organic fibers, inorganic fibers, or both, and is a woven fabric or non-woven fabric made of fibrous organic substances or inorganic substances, singly or together, by a conventional method. can be mentioned.

Examples of fibrous organic substances include pulp, cotton,
Natural fibers of plants and animals such as hemp, silk, and wool; synthetic fibers such as copper ammonia fibers and viscose rayon; polyethylene, polypropylene, polyamide,
Synthetic fibers include polyester, polyacrylonitrile, polyvinyl alcohol, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polyurethane, and copolymers thereof, and fibrous inorganic substances include asbestos, rock wool, Mineral cotton, kaolin fiber, glass fiber,
Mineral fibers such as boron fibers, quartz fibers, fused silica fibers, ceramic fibers, such as iron, aluminum,
Metal fibers made of materials such as stainless steel and copper,
Alternatively, carbon fibers and blended products thereof may be mentioned. Woven fabrics and nonwoven fabrics made of these fibers may contain additives or treatment agents such as adhesives, surface treatment agents, stabilizers, and antistatic agents, and may also be dyed.

Sepiolite or attapulgite (or palygorskite) used in the present invention is a hydrous magnesium silicate having hydroxyl groups on the surface.
gnesium silicate) and hydrated magnesium aluminum silicate (hydrousma silicate).
sepiolite is a clay mineral consisting of Si6M&0,5
(OH) 2 (Sun 20) 2nd and 4th 20th, attapalgite (or palygorskite) Si3M saddle 02.

It can be expressed by the molecular formula: (OH)2(日20)4・岬20. Since these minerals occur in various forms, they are called mountain cork, mountain leather, and mountain wood. Sepiolite or attapulgite used in the present invention (
or palygorskite) [hereinafter abbreviated as sepiolite, etc.] is an aqueous dispersion in which the concentration of sepiolite, etc. is about 0.05 to 5% by weight, preferably about 0.1 to 1% by weight.
It is an aqueous dispersion of.

This aqueous dispersion, like other clays, can be obtained by simply adding sepiolite to water or a mixture of water and a hydrophilic organic solvent and mixing with a fly pestle by appropriate means. If a polyhydric alcohol such as , glycerin or sugar is allowed to act on sepiolite or the like in advance, it can be more easily dispersed in the dispersion chamber. Any dispersion method may be used for this dispersion, but a dispersion having a concentration of mountain bark of about 1% or less can be dispersed using a high-speed mixer, for example.

For dispersions of about 5 to 1% by weight, mixing methods such as, for example, three rolls are suitable. For medium-concentration dispersions of about 1 to 5% by weight, a dispersion method such as a dispersion machine for papermaking clay in which the dispersion and kneading are carried out at the same time is preferred. During dispersion, dispersion aids, adhesives, etc. may be added.

Examples of additives include inorganic compounds such as sodium polyphosphate, polyphosphoric acid, ammonium polyphosphate, alumina sol, and silica sol; organic chemicals such as polyvinyl alcohol, CMC (carboxymethyl cellulose), and synthetic rubber latex; ,Funori,
Examples include natural polymer compounds such as turquoise seaweed, starch, and konjac. In the present invention, the fabric is treated with an aqueous dispersion such as sepiolite and dried. Usually, the fabric is soaked in the aqueous dispersion such as sepiolite to impregnate it, or the fabric is treated with an aqueous dispersion such as sepiolite. After applying the non-stick dispersion by means such as brushing, spraying, or roll coking, the water content is reduced by natural filtration or vacuum filtration as required, and then drying at room temperature to about 150°C.

Before, after, or during this drying, the surface can be made to a desired smoothness or embossed using a roll or the like.
The amount of sepiolite used is approximately 1 to the weight of the noncombustible sheet.
90%, preferably about 10-60%. The noncombustible sheet obtained in this way generally has excellent heat resistance, high noncombustibility, and excellent texture, and has a very delicate structure in which the short fibers of mountain bark and organic or inorganic fibers are in close contact with each other. Therefore, extremely thin sheets can be manufactured and have excellent strength. Furthermore, it is possible to freely perform conventional printing on the surface without any particular hindrance, and it is also possible to leave the organic or inorganic fiber portions without printing. This phenomenon can be used to produce Japanese paper-like surface patterns, such as wallpaper, fusuma paper,
Suitable as decorative paper and clothing material. EXAMPLES The present invention will be specifically explained below with reference to Examples.

Example 1 An aqueous dispersion of sepiolite produced in Korea shown in Table 1 below was placed on a glass mat (chopped strand mat, 300 ml) kept flat, and after natural oven filtration, it was heated at 100 qo.
Dry for 0 minutes.

The properties of the obtained nonflammable sheet are as follows. 1st
Table Example 2 The following various nonwoven fabrics were soaked in a 1% aqueous dispersion of sepiolite (produced in Korea), dried at 100 qC, and the soaking and drying process was repeated twice.

Table 2 shows a comparison of the obtained non-flammable sheet with the nonwoven fabric before treatment. Table 2 Example 3 A woven asbestos fabric (1,200 yen/le) was soaked in a 0.5% mountain bark aqueous dispersion, dried at 10,000 yen, and the soaking and drying were repeated once more.

As a result, an asbestos sheet with 120 pieces of mountain bark attached to it is obtained. This sheet did not blow out asbestos powder, was white and had a good texture, and compared to the crumbly feel of asbestos powder before treatment, a significant surface improvement was observed. Example 4 A 1% dispersion of sepiolite (produced in Korea) was uniformly placed on the following various organic cloths, passed through a suction oven, and dried at 7000C.

Table 3 shows a comparison between the obtained treated fabric and the untreated fabric. Table 3 * Put a cloth under a Bunsen burner (blue flame 5) for 5 seconds to check for flame formation, remove the flame and check for self-extinguishing properties.

Comparative Example 1 Experiments i and ii were conducted using the following magnesium silicate-based inorganic powder materials.

1 Talc (manufactured by Fuji Talc ■, produced in Chungju, South Korea) 2 Asbestos (
Grade bait size, produced in Quebec, Canada) 3 Synthetic magnesium silicate (magnesium trisilicate, manufactured by Kyowa Chemical Industry ■) 4 Yamahide (Ade Plus ML-10 manufactured by Takeda Pharmaceutical Company ■, Sepiolite manufactured in Korea) Experiment i: 1% dispersion Preparation of liquid Weigh 100 yen of each powder from 1 to 4 above, and add 99 yen to each powder.
After adding 00 desk water, use a homomixer to mix 20
After stirring for a minute, four 1% dispersions were obtained.

The state of the dispersion after it was left to stand for 30 minutes was as follows. 1 (talc)...Almost all of the talc powder settled and a talc layer was observed at the bottom.

2 (Asbestos) Some asbestos was floating,
A large sedimentary layer of asbestos was observed at the bottom.

3 (Synthetic magnesium silicate): Although no sedimentation layer was formed, precipitation of magnesium silicate was observed at the bottom.

4 (Mountain skin): It maintained a uniformly dispersed state, and this state did not change even if it was left for a day and night.

Experiment ii: Preparation of sheet After thoroughly sacrificing each dispersion prepared in experiment i, weigh 6k9 and calculate the area of 1 and 25 for each dispersion.
The coating was applied to the entire surface of a cotton cloth having a weight of 0.05 kg.

Note that the cotton cloth was spread on a wire mesh, a suction device was provided under the wire mesh, and each sheet was processed by the following method. 1 (Tarta) and 2 (Asbestos)...The water in these dispersions ran out before they were evened out, so there was no need to reduce the pressure.

3 (synthetic magnesium silicate): Although it was possible to spread it evenly onto the cloth, when the pressure was reduced, water and most of the powder passed through the cloth.

4 (Mountain bark) When smoothed on the cloth, a layer of a certain thickness was formed, and when the pressure was reduced, only water was filtered out and a coating layer was formed on the surface of the cloth.

The cotton cloth treated as described above was dried at 70 oo to prepare four types of sheets.

a) Amount of inorganic powder deposited on each sheet, b. 360
The measurement results of the o-bending test and c) flaming test are shown in the following table together with the dispersion.

Claims (1)

[Claims] 1. A noncombustible sheet coated with sepiolite or attapulgite (or palygorskite) obtained by coating or impregnating a woven or nonwoven fabric with an aqueous dispersion of sepiolite or attapulgite (or palygorskite) and drying.