JPS61263615A - Sheet having deodorizing, moisture-absorbing and water-absorbing properties - Google Patents

Abstract

PURPOSE:To obtain the titled uniform sheet having an excellent deodorizing property by using an activated carbon fiber as an activated carbon material, using a moisture- and water-absorbing fiber as a moisture- and water-absorbing material and fixing both materials with a binder material. CONSTITUTION:A precursor org. fiber is made fire-resistant by using rayon, etc., as the material, carbonized by baking and activated with a gas or a pitch fiber is heat-treated and activated with a gas to obtain an activated carbon fiber. fibers of cotton, rayon, etc., are chemically modified and moisture- and water-absorbing properties are provided to the fiber to obtain a moisture and water-absorbing fiber. Both fibers are mixed with a binder material of polyester, polyethylene, etc., the mixed fiber is opened by using a roller card, a web is formed and then a sheet is formed by using a heat-treating device for nonwoven fabrics, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a sheet with excellent deodorization and moisture/water absorption properties. More specifically, it relates to a sheet in which fibrous activated carbon (hereinafter abbreviated as FAC) as an activated carbon material and hygroscopic/water absorbent fiber (hereinafter abbreviated as AQF) as a hygroscopic/water absorbing material are immobilized with a binder material.

(0) Conventional technology Examples of products that require the dual effects of deodorization and moisture/water absorption include sanitary products, insoles (shoe insoles), and hat linings. Material usage technology in this product field has so far been limited to (1) sheets containing activated carbon (powdered activated carbon, granular activated carbon, and FAC) when the main purpose is deodorizing effect;
If the main purpose of the material is (2) hygroscopic or water-absorbing effect, the hygroscopic or water-absorbing substance (hygroscopic or water-absorbing resin, hygroscopic or water-absorbing material) is
When a sheet-like (or paper-like) material containing water-absorbing fibers, etc. is intended to achieve both effects at the same time, a material in which both materials are simply laminated in multiple layers has been used. However, a single sheet-like (or paper-like) material that can simultaneously exhibit both effects has not been known so far.

(c) Problems to be solved by the invention If materials made of activated carbon are used in the above-mentioned fields of application, moisture absorption and
No water absorption effect (activated carbon is inherently hygroscopic, but successive regeneration is required to achieve its effect)
However, there was no deodorizing effect when using a material made of a moisture-absorbing substance. Therefore, the desired effect can be obtained by using a multilayer material in which both materials are simply layered, but the cost is high.
The final product obtained is bulky and has poor air permeability due to pressure loss. .

The object of the present invention is to provide a uniform sheet that simultaneously has deodorizing properties and moisture/water absorbing properties, that is, it uses FAC with excellent deodorizing properties and AQF with excellent moisture/water absorbing properties.

(d) Means for Solving the Problems The inventors of the present invention have made intensive studies to solve these problems, and as a result, have obtained a sheet containing FAC and AQF as shown below. In other words, the mechanism of odor generation is closely related to the cause of the odor and the amount of moisture (humidity) in the atmosphere, and the sheet of the present invention uses a water-absorbing material to remove moisture, so it absorbs moisture and water without causing odor. condition, and at the same time, the generated substances can be removed using activated carbon material.

FAC is FACl or fiber formed by making precursor organic fibers flame-resistant using rayon, polyacrylonitrile, or special phenol as raw materials, followed by carbonization by firing, and further gas activation with air, carbon dioxide, or water vapor. The pitch fibers are melted and extruded through a spinning nozzle, drawn and thinned to obtain pitch fibers, and the resulting pitch fibers are heat-treated in an oxidizing atmosphere to make them infusible. FACl obtained by gas activation with carbon dioxide gas or water vapor, or FAC obtained by first obtaining carbon fiber (GPCF) through a differentiated carbonization process and then gas activation with air, carbon dioxide gas, or water vapor.
etc. are possible.

The FAC used here has a specific surface area of 700 to 2500.
7g (BET method), benzene adsorption power 20-90wt
% (J Is-1474), average pore diameter 10-30 people adsorption performance, fiber diameter 7-25 μm, J I 5-
Fiber strength measured with R7601 10-40kg/+n+
J, elastic modulus 600-30001<g/nJ-elongation 2-4% fiber physical properties.

AQF can be considered to be fibers such as cotton, rayon, vinylon, acrylic fibers, etc., which are chemically modified to have moisture and water absorption properties. Preferably, fibers are carboxymethylated cotton or rayon. The fiber! One manufacturing method is to alkalize cellulose such as rayon or cotton as a raw material in an organic solvent such as water and an alkali-containing alcohol at a temperature of 10 to 70°C, preferably 20 to 50°C, and then Add monochloroacetic acid or sodium monochloroacetate and convert to carboxymethyl (CMC) by raising the temperature to roughly 40-90°C, preferably 50-80°C, and then heat-treat or add a crosslinking agent such as epichlorohydrin. Obtained by processing method.

The water absorption performance of AQF is to absorb 1 to 2000 times the weight of the dry fiber (ii amount analysis), preferably 20 to 2000 times the weight of the dry fiber.
It is necessary to absorb 500 times more water. The moisture absorption performance is, for example, 10 to 98% moisture absorption based on the dry fiber weight under conditions of 20° C. and 95% relative humidity;
Desirably, it is necessary to absorb 40 to 90% of moisture. In addition, the moisture absorption rate (because it is fibrous and has a large surface area, it is significantly faster than conventional powdered water absorption materials, about 10%
It is necessary to reach moisture absorption equilibrium at 0 o'clock opening, preferably within 24 hours. Regarding the fiber properties, the single yarn fineness of AQF is 0.5 to 20 denier,
Desirably, the yarn length is 1 to 7 denier, the yarn length is 1 mm or more, the strength is 0.11-1 o/denier, and the elongation is 1 to 30%.

Binder materials include polyester, polyethylene,
Possible materials include polypropylene, polystyrene, and polyvinyl chloride.

The fiber shapes of FAC, AQF, and the binder material may include short fibers, long fibers, tow, etc., but are not limited to these.

The sheet may be formed by a dry nonwoven fabric method, a wet nonwoven fabric fabric method, a papermaking method, etc., but a dry nonwoven fabric fabrication method is preferable. That is, FAC (10-80wt%), AQF
(10-80wt%), binder material (10-80wt%), binder material (10-80wt%)
wt%) is opened using a roller card used in dry nonwoven fabric production to form a wear, which is then made into a sheet using a heat treatment device for nonwoven fabrics, a paper machine dryer, or the like. In addition, it is better to use the needle punch method to intertwine and bond the sheets, and to improve the processability of the product and increase the uniformity of the strength and adsorption performance of the resulting sheet, use FACSAQF before processing. It is desirable to mix the binder material and the binder material as uniformly as possible.

(Book) Examples Hereinafter, the present invention will be specifically explained with reference to Examples.

Examples 1 to 7 Fiber-forming pitch with a softening point of 240°C was crushed at room temperature,
The melting temperature and spinning temperature were set at 280° C., and the molten pitch was sent to a spinning nozzle section, and spun by being discharged from a nozzle mouthpiece with a nozzle hole diameter of 0.3 mm and a number of holes of 24. The pitch fiber was heated from room temperature to 20% in an oxidizing atmosphere (N025vo1%).
Infusibility was achieved by raising the temperature to 0°C for 30 minutes and then to 400°C for 90 minutes. The invulnerable fiber was activated with steam at an activation temperature of 850° C. for 30 minutes to obtain FAC.

The adsorption performance of this FAC has a specific surface area of 1832wn”/g.
(BET method), benzene adsorption power 45wL% (J Is
-1474), the average pore diameter was 17, and the fiber physical properties were a fiber diameter of 16 μm, a fiber strength measured by J15-R7601 of 15 kg/lel, an elastic modulus of 1200 kg/nJ, and an elongation of 2.3%.

8 pieces of rayon fabric with a single yarn fineness of 2 denier and a yarn length of 51 mm.
．． After alkalization by treatment at 25°C for 1 hour in a mixed solvent of water/methanol 72-propanol containing 73 mol of sodium hydroxide, 4°84 mol of monochloroacetic acid and 0.97 mo + epichlorohydrin were added. It was treated at ℃ for 4 hours. After the reaction, the reaction was replaced with 85vo 1% methanol water, the phenolphthalein was neutralized with hydrochloric acid, and then washed with 100% methanol, dried, and AQ
I got an F.

The water absorption capacity of this AQF is 72 times (cc/g-fiber),
The moisture absorption performance was 37 wt% at 20° C. and 70% relative humidity, and moisture absorption equilibrium was reached in about 18 hours. The fiber properties are: single yarn fineness 2.5 denier, fiber strength 2.4 g/denier,
The elongation was 10%.

As the binder material, polyester fibrous binder R Melty 1 manufactured by Unitika was used. The fiber properties were as follows: single yarn fineness 4 denier, yarn length 51-1, fiber strength 3.2 g/denier, elongation 45%, and melting temperature 110°C.

The above-mentioned FAC, AQF, and binder materials were mixed at various mixing ratios to form garments using an ordinary roller card, and then formed into sheets using a rotary heat treatment apparatus for non-woven fabrics at a heat setting temperature of 110°C.

The sheet weight thus obtained was extremely uniform at 50 g/J. These sheet-like materials were evaluated for sheet forming properties, deodorizing properties, moisture absorption/water absorption properties, etc. Table 1 shows the results.
Shown below.

Table 1 The sheet of Example 2.3.4.5 was used as a material for sanitary products, insoles, and hat linings, and was found to have suitable usage performance.

(f) Effects of the invention The present invention relates to a single sheet consisting of FAC (deodorization), AQF (moisture absorption/water absorption), and a binder, and is a material suitable for application fields that require deodorization and moisture absorption/water absorption at the same time. can be provided.

Claims (3)

[Claims] (1) A sheet that is made of activated carbon material and water-absorbing material and has deodorizing, moisture and water-absorbing properties. (2) The sheet according to claim 1, wherein the activated carbon material is fibrous activated carbon. (3) The sheet according to claim 1, wherein the moisture-absorbing and water-absorbing material is fibrous.