JPH11140765A - Water-soluble nonwoven fabric laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a nonwoven fabric laminate having sufficient water resistance to water at a temperature of the bodily temperature or below when used as a substrate for medical care or nursing and capable of being disinfected and dissolved in hot water after the use by forming a laminate of water-soluble nonwoven fabrics undergoing water repellent treatment such as a polyvinyl alcohol-based fabric. SOLUTION: This nonwoven fabric laminate is formed by laminating two or more kinds of water-soluble nonwoven fabrics prepared by applying a fluorine-based water repellent to nonwoven fabrics composed of water soluble resin fibers such as polyvinyl alcohol. The resultant nonwoven fabric laminate is used as a substrate for medical care or nursing and then treated with any of hot water or disinfectant-containing hot water at >=70 deg.C, preferably >=100 deg.C, disinfected and dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble nonwoven fabric, and more particularly, to a laminate comprising two or more water-soluble polyvinyl alcohol (hereinafter abbreviated as PVA) -based nonwoven fabrics, The present invention relates to a water-soluble nonwoven fabric laminate that can be disposed of in sewage by being dissolved in water.

[0002]

2. Description of the Related Art Conventionally, in Japan, due to the small land area, some wastes are recycled (regenerated) or treated as industrial waste at a treatment plant. Most are incinerated and disposed of. In recent years, industrial waste treatment plants have also become full,
There are few new candidate sites for industrial waste disposal, and incineration of waste is difficult due to the problem of dioxin.

[0003] In particular, in recent years, the amount of waste (so-called medical waste) generated in hospitals and nursing homes for the elderly has increased, and the problem of the labor and man-hours of these treatments has become a hot topic. In particular, in order to dispose of plastic moldings such as plastic trays for placing scalpels and candies after surgery, plastic basins used by patients, and plastic trays for treating parts and body fluids removed from patients, It is not possible to send to a recycling plant or a waste disposal site, but after disinfection, it takes a lot of trouble to send to a regeneration plant or a waste disposal site, or when incinerated as it is, dioxin can be reduced by incineration There is a very painful problem that it will occur, and there is a continuing need for rapid improvement.

[0004]

The plastic molded product is not melted, not recycled, sent to an industrial waste disposal site, and is not incinerated. Dissolution treatment is not practical because of the problem of these waste liquids, and is dissolved in water. In order to make the molded product water-soluble, it is necessary to use a water-soluble resin.However, when the water-soluble molded product is made of solid material, it has strength but takes time to dissolve in water. Too practical. Also, when using a resin that is molecularly designed to dissolve in water at high speed as a solid material,
It becomes too soft due to moisture absorption and cannot be used. There is also a means of forming a water-soluble molded article with a water-soluble resin foam, but in this case, although the time for dissolving in water is short, there is a problem of strength and a thin material cannot be used, so that it is not practical. For disposal treatment, a water-soluble molded product that dissolves in water quickly, can be disposed of sewage, is thin, light, strong, and does not become soft due to moisture absorption is desired. In particular, molded products that are used and contaminated for medical or nursing care are those that are thin, light, strong, do not soften due to moisture absorption, dissolve quickly when dissolved in water, can be easily disinfected, and can be disposed of in sewage. Is desired.

[0005]

Means for Solving the Problems However, the present inventors have conducted intensive studies in order to solve such problems, and as a result, have found that a laminate composed of two or more water-soluble nonwoven fabrics, particularly two or more water-soluble PVA-based nonwoven fabrics It has been found that a water-soluble nonwoven fabric laminate obtained by laminating the above can achieve the above object, and the present invention has been completed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described specifically. The greatest feature of the present invention is that a water-soluble nonwoven fabric is laminated.

Hereinafter, the base material used in the laminate of the present invention will be described. First, the fibers constituting the water-soluble nonwoven fabric are not particularly limited, but PVA-based fibers, conjugate fibers of PVA-based resins and other water-soluble resins, and sea-island fibers are preferred. The water-soluble resin in the present invention is not particularly limited as long as it is soluble in water, preferably in hot water of 50 ° C. or higher. Examples of such a water-soluble resin include PVA-based resins, oxyalkylene group-containing PVA-based resins, polyvinylpyrrolidone-based resins, starch-based resins, carboxymethylcellulose, methylcellulose, polyethylene oxide, various polysaccharides, and the like. Resins, oxyalkylene group-containing PVA-based resins, and polyvinylpyrrolidone-based resins are practical. Industrially, those having hot melt adhesiveness are more preferable. Examples of those having hot melt adhesiveness include PVA resins having an average degree of polymerization of 300 to 800 and a saponification degree of 90 mol% or more, PVA resins containing about 0.1 to 10 mol% of oxyalkylene groups, and PVA resins.
A-type resins are mentioned, and those obtained by blending glycerin, diglycerin, polyethylene glycol or the like as a plasticizer with these resins are more practical. Particularly preferably, a resin which is biodegradable in nature after being dissolved and disposed in water, that is, a PVA-based resin or an oxyalkylene group-containing PVA-based resin is most preferable in terms of sewage disposal.

The water-soluble non-woven fabric used in the present invention is a water-soluble PVA non-woven fabric. A water-soluble PVA-based fiber is formed by spun lace, spunbond, melt blow, spinning blow, chemical bond, needle punch or stitch bond. It is a nonwoven fabric manufactured by a known method such as a method.

Water-soluble PVA for producing the nonwoven fabric
The system fiber is spun using a water-soluble PVA resin as a raw material. Such a water-soluble PVA-based resin is usually produced by saponifying polyvinyl acetate obtained by polymerizing vinyl acetate. However, the present invention is not limited to this, and a small amount of unsaturated carboxylic acid ( Salts, esters, amides,
Nitrile, etc.), olefins, vinyl ethers, unsaturated sulfonates, oxyalkylene group-containing unsaturated monomers, and the like, and may contain components copolymerizable with vinyl acetate. Since the completed water-soluble nonwoven fabric preferably has water resistance, it is preferably dissolved in warm water of 70 ° C. or more, for example, a water-soluble PVA-based resin having a saponification degree of 80 to 100 mol% and an average polymerization degree of 100 to 5500 (modified PVA). The spinning is preferably carried out in an aqueous system,
There is no particular limitation on a solvent system or a mixed solvent system thereof. Further, a plasticizer such as glycerin or diglycerin may be added during spinning.

For laminating PVA-based nonwoven fabrics, it is more advantageous to laminate two or more kinds of different kinds or production methods than to laminate PVA of the same type and those made by the same production method. . Although nonwoven fabrics manufactured separately may be laminated, industrially, the first nonwoven fabric may be first spunlace method, spunbond method, melt blow method, spinning blow method, chemical bond method, needle punch method or stitch bond method. And then laminated thereon by a nonwoven fabric manufacturing method in a manner different from the method by which the first nonwoven fabric was manufactured. Industrially, a laminated nonwoven fabric obtained by performing a melt blow method on a nonwoven fabric manufactured by a spunbond method and further performing a spunbond method on the nonwoven fabric is desirable, but is not limited thereto.

The thickness of such a nonwoven fabric laminate is 0.01 mm
The thickness range is preferably from 10 to 10 mm, and the thickness is preferably 0.01 to 10 mm.
When it is less than 10 mm, the strength is insufficient and it is inconvenient.
When it exceeds, the dissolution time in water is too long.

The above nonwoven fabric is usually subjected to a water-repellent treatment. Such treatment improves the water resistance to water at a temperature of about blood or body fluid. The water repellent treatment is carried out by immersing the nonwoven fabric in a liquid of a water repellent, spraying or coating the liquid repellent on the surface of the nonwoven fabric. For the purpose of the present invention, the adhesion amount of the water repellent is 0.0
It is preferable that the content be 01 to 1%.

Examples of the water repellent include fluorine-based water- and oil-repellents such as perfluorooctyl acrylate polymer, polytetrafluoroethylene, and fluororesin emulsion; ethylene urea-based such as octadecylethylene urea;
Examples thereof include melamines such as methylol melamine, methylolamides such as methylol stearamide, and silicones such as methyl-substituted linear dimethylpolysiloxane. SCOTCHG when listing specific product names
ARD FC-251, FC-5101, FC-510
2 (Sumitomo 3M), Octex EM (Hodogaya Chemical), Paraguard 823 425 519Z (Ohara Palladium Chemical), TF-2000 TF-2001 (Matsumoto Yushi), SUMIFULOIL EM-201 (Sumitomo Chemical), Dairoof DC DG 700 (Daiwa) Chemistry),
NK Guard NDN-7 22 7300, I-700
4 (Nichika Chemical), PHOENIX PE-1240 C
W-40P (Futaba Fine Chemical), Dickguard FS-1, FS-91, F90-N (Dainippon Ink)
There is. Thus, the nonwoven fabric obtained by the present invention has a basis weight of 20%.
About 300 g / m ² is particularly useful.

In the present invention, the raw material PVA-based fibers include wood fibers such as groundwood pulp, kraft pulp, semi-chemical pulp, sulfite pulp, soda pulp, chemical ground pulp and the like, as long as the scope of the present invention is not impaired. ,
Manila hemp, plant fibers such as jute, polyester-based, polyacryl-based, polyolefin-based, polyvinyl chloride-based, hydrophobic synthetic fibers such as polyamide-based, PVA-based fibers other than those defined in the present invention, hydrophilic fibers such as starch, Regenerated fibers such as viscose rayon, viscose soup, and acetate, inorganic fibers such as glass fiber, asbestos, and carbon fiber, and mixtures thereof may be used.

If necessary, various additives such as known agents such as antibacterial agents, bactericides, antioxidants, dyes, pigments, plasticizers, crosslinking agents, softening agents, curing agents, anti-stick agents, etc. Can be used together.

The nonwoven fabric laminate of the present invention thus obtained is used for various uses including medical use. Specific applications include medical gloves, surgical gowns, sheets, pillowcases, sleepwear, curtains, towels, hangings, gowns, headcovers, face masks, shoe covers, sponges,
Bandages, tapes, under bats, diapers, napkins, agricultural sowing sheets, cold gauze, vinyl house films,
Examples include paper pots, disposable tableware, trays, tobacco filters, and the like. Although mainly described above mainly on the PVA-based fiber, the present invention is not limited to the fiber, and any fiber provided with hot water solubility by introducing a functional group or the like, including starch, polyester, and nylon, may be used. Can be used.

In the case of medical applications, the water-soluble nonwoven fabric laminate contaminated with bacteria after use is treated with water containing a disinfectant, hot water of 70 ° C. or more (furthermore, 95 ° C. or more), and heat of 70 ° C. or more containing a disinfectant. It is preferable to disinfect and dissolve in any of water (further, at 95 ° C. or higher), the effects of the present invention can be exerted without regret, and sewage disposal is possible as long as heavy metals are not mixed.
Also, a dissolution method using hot water of 100 ° C. or more under high pressure is extremely efficient from the sterilization point of view. The form of the water-soluble nonwoven laminate is sheet-like, bag-like, tubular, box-like, or tray-like, but it can be easily thrown. Is preferably in the form of a tray. In particular, in a hospital, the tray of the present invention is placed on a wire mesh container, and a surgical tool such as a scalpel, kanshi, tweezers, or the like contaminated for use is placed and disinfected and dissolved with hot water. It can be used for new surgery and is very useful for saving labor in hospitals. At this time, the tray may be covered with an upper lid or sheets of the present invention to prevent infection.

[0018]

The present invention will be specifically described below with reference to examples. Example 1 PV having an average degree of polymerization of 1800 and an average degree of saponification of 99.3 mol%
A was dissolved in 90 ° C. water to prepare a spinning stock solution having a resin concentration of 15% by weight. The stock solution was discharged from a die having a hole diameter of 0.5 mm and a number of holes of 1,000 into a saturated sodium sulfate bath so as to have a single fiber fineness of 1.5 denier, thereby forming a yarn. After 14
The film was stretched 8 times at 0 to 200 ° C., dried, and then cut into a fiber length of 45 mm.

The above fibers are laminated in a web on a flat plate, and the pressure is 100 kg / cm ² from a nozzle having a nozzle hole of 0.1 mm.
Of water is jetted into a water columnar flow, dehydrated with a pressure roll, 100
By drying at a temperature of 70 ° C., a PVA nonwoven fabric having a basis weight of 70 g / m ² was produced. Next, a spinneret having a nozzle hole row width of 1.2 m (diameter 0.
15 mm), using a device with a jet gas port width of 1.4 m,
Spraying water-containing PVA pellets (water content 2.5% by weight) with an average degree of polymerization of 2,000 and an average degree of saponification of 96 mol% on the web at a collection distance of 15 cm while supplying heated air at 5 Nm ³ / min per 10 cm. Then, a sheet-shaped nonwoven fabric having an average fiber diameter of 4 μm was manufactured, and was used as a laminate.

Table 1 shows the properties of the nonwoven fabric. In addition, each physical property value was measured as follows.

(1) Solubility in hot water A test piece of 30 × 30 mm was put into 300 g of hot water,
The temperature was raised while stirring at 400 rpm, and the temperature at which the dissolution rate became 95% or more was measured. (2) Water resistance According to the static pressure method of the water resistance test A method (low water pressure) of JIS L 1092 (3) Bending resistance JIS L 1085 (41.5 degree cantilever method 2c)
mx 20cm x 5) (average value in MD direction and TD direction)

Example 2 The nonwoven fabric of Example 1 was immersed in a fluororesin emulsion (Paraguard 823 manufactured by Ohara Palladium Chemical Co., Ltd.), subjected to a water-repellent treatment, dehydrated and dried to produce a nonwoven fabric having a resin deposition amount of 0.01% by weight. did. Table 1 shows the results.

Example 3 The same experiment as in Example 2 was conducted except that PVA having an average degree of polymerization of 1200 and an average degree of saponification of 89 mol% was used as the first nonwoven fabric. Table 1 shows the results.

Table 1 Example 1 Example 2 Example 3 Weight per unit area (g / m ² ) 70 70 70 Hot water solubility (° C) 90 90 60 Water pressure resistance (mm / Aq) 125 220 230 Bending degree (mm) 25 35 30

[0024]

According to the present invention, by laminating two or more types of water-soluble nonwoven fabrics, it is possible to maintain the hand while keeping the body temperature of blood or the like that may come into contact during use or water at a temperature lower than the temperature. In addition, a hot water soluble nonwoven fabric laminate having sufficient water resistance can be obtained.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI D04H 1/42 D04H 1/42 A M 1/46 1/46 C D06M 15/295 D06M 15/295 (72) Inventor Kenji Hasegawa 1-88 Oyodonaka, Kita-ku, Osaka-shi Nippon Gosei Chemical Industry Co., Ltd.

Claims (8)

[Claims] 1. A water-soluble nonwoven fabric laminate comprising two or more water-soluble nonwoven fabrics laminated. 2. The water-soluble nonwoven fabric laminate according to claim 1, wherein the water-soluble nonwoven fabric is made of a polyvinyl alcohol-based nonwoven fabric. 3. The water-soluble nonwoven fabric laminate according to claim 1, wherein the water-soluble nonwoven fabric is subjected to a water-repellent treatment. 4. The water-soluble nonwoven fabric laminate according to claim 3, wherein the laminate is subjected to a water-repellent treatment using a fluorine-based water-repellent. 5. The water-soluble nonwoven fabric laminate according to claim 3, wherein a water-repellent agent is coexisted in a water-soluble resin and subjected to a water-repellent treatment. 6. The water-soluble nonwoven laminate according to claim 1, which is used as a medical or nursing base material. 7. The water-soluble nonwoven fabric according to any one of claims 1 to 6, wherein the nonwoven fabric is disinfected and dissolved after use by using either hot water of 70 ° C or higher or hot water of 70 ° C or higher containing a disinfectant. Laminate. 8. After use as a medical or nursing substrate,
The water-soluble nonwoven fabric laminate according to any one of claims 1 to 6, wherein the laminate is disinfected and dissolved in hot water of 100 ° C or higher or hot water of 100 ° C or higher containing a disinfectant.