JPS62276049A - Dustless antiseptic cloth - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to dust-free and sterile fabrics such as dust-free clothing and sterile clothing worn in so-called clean rooms. .

[Conventional technology]

The industries that require dust-free and sterile clothing cover a wide range of fields, as shown in Tables 1 and 2.

(Left below) By the way, the main characteristics required of dust-free and sterile fabrics are: (1) No dust is generated from the fabric; (2) Dust does not pass through the fabric and, for example, inside the garment in the case of a dust-free garment. (3) Dust (bacteria) does not easily adhere to the surface of the fabric (4) Good antistatic performance against static electricity (filter effect). be.

[Problem that the invention seeks to solve]

Conventional dust-free and sterile clothing uses chemical fibers such as rayon and nacetate, and synthetic fibers such as nylon and polyester, but these do not fully satisfy the above requirements. Synthetic fibers are electrically poor conductors, so static electricity is generated due to movement (friction) during work, causing dust to adhere to clothing, unpleasant "crackling" discharges, electric shocks, and combustibles. Problems include ignition of substances, explosion, clogging of clothing, and causing discomfort.

In addition, recently, for example, in the semiconductor field, there has been a demand for high cleanliness clean rooms such as Class 10 or Class 1 and their equipment (bioclean units, etc.).
Not only is dust generation from the human body a fairly serious problem, but prevention of static electricity is also an important issue.

The present invention has been made in view of the above-mentioned problems and problems of conventional products, and by configuring the fabric using ion exchange fibers, it prevents dust from being generated from the human body and dust from adhering to clothing, etc. It also aims to prevent the generation of static electricity.

[Means for solving problems]

The present invention is a dust-free and sterile fabric characterized in that at least a part of the material is made up of ion exchange fibers obtained by supporting an ion exchanger on natural fibers or synthetic fibers.

In the present invention, this dust-free and sterile fabric refers to dust-free clothing,
including sterile garments (these include jackets and pants);
Applications that do not want the presence of dust or fungi, such as clothing, footwear, or their accessories such as hats, gloves, masks, and shoes, carpets, curtains, wall materials, or wipers used in sterile rooms, and even packaging supplies. It means anything used in.

Note that fungi are generally attached to dust in many cases, so preventing the generation of dust has the effect of reducing fungi.

Hereinafter, the present invention will be explained in detail using dust-free and sterile clothing as an example.

First, to explain ion exchange fibers, they are fibers in which cation exchangers and/or anion exchangers are supported on a support such as natural fibers, chemical fibers, synthetic fibers, or blended yarns or mixed yarns of these fibers. As a method, it may be supported directly on a fibrous support, or it may be formed into a woven, knitted or flocked form and then supported thereon. In any case, it is sufficient that the fiber ultimately supports the ion exchanger.

Now, the natural fibers can be wool, silk, etc., the chemical fibers can be rayon or acetate, and the synthetic fibers can be those made from hydrocarbon polymers or fluorine-containing polymers. or polyvinyl alcohol, polyamide, polyester, polyacrylonitrile, cellulose, cellulose acetate, etc.

Examples of the hydrocarbon polymer include aliphatic polymers such as polyethylene, polypropylene, polybutylene, and polybutene, aromatic polymers such as polystyrene and polyα-methylstyrene, and alicyclic polymers such as polyvinylcyclohexane. Alternatively, copolymers of these may be used.

In addition, examples of the fluorine-containing polymer include polytetrafluoroethylene, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-propylene hexafluoride copolymer, and vinylidene fluoride-hexafluoride copolymer. Polypropylene copolymer and the like are used.

In any case, the support can be easily grafted, has high mechanical strength, is less susceptible to shedding and generation of fiber waste, and is less affected by heat, is less affected by acids, alkalis, and solvents, and is free from insects.
Any material that is less affected by mold may be used, and can be selected as appropriate in consideration of usage, economy, effectiveness, etc., but polyester and nylon are generally used, and polyester is particularly preferred.

Next, as the ion exchanger, various cation exchangers or anion exchangers can be used without particular limitation.

For example, bodies containing cation exchange groups such as carboxyl groups, sulfonic acid groups, phosphoric acid groups, and phenolic hydroxyl groups, and anion exchangers such as primary to tertiary amino groups, quaternary ammonium groups, sulfonium groups, and phosphonium groups. Examples include group-containing bodies, or homogeneous or heterogeneous ion exchangers of polymerized or condensed type containing the above-mentioned positive and negative ion exchange groups.

Specifically, styrene compounds such as acrylic acid, methacrylic acid, vinylbenzenesulfonic acid, styrene, ar-halomethylstyrene, acyloxystyrene, hydroxystyrene, and aminostyrene, vinylpyridine, 2
- a polymer of a monomer having a cationic or anionic exchange group or a group convertible thereto, such as methyl-5-vinylpyridine, 2-methyl-5-vinylimidazole, acrylonitrile, sulfuric acid, chlorosulfonic acid, sulfonic acid, or the like; Copolymers of these monomers with monomers having two or more double bonds such as divinylbenzene, trivinylbenzene, butadiene, ethylene glycol, divinyl ether, ethylene glycol dimethacrylate, or polyethylene, polyvinyl fluorocarbon ether or polyester. Ion exchangers obtained by introducing cation and/or anion ion exchange groups or converting into ion exchange groups as necessary into a polymer obtained by graft polymerizing styrene to tetrafluoroethylene, and furthermore, tetrafluoroethylene. There is an ion exchanger made of a copolymer of a vinyl monomer such as chlorotrifluoroethylene and a perfluorovinyl monomer having an ion exchange group or a group convertible to an ion exchange group.

Next, as a method for supporting the ion exchanger on the support, for example, the support may be exposed to ultraviolet rays, α rays, β rays, electron beams, γ rays, etc.
irradiate with ionizing radiation such as radiation, or use oxygen, ozone,
Chlorsulfonic acid, hydrogen peroxide, penzoyl peroxide,
There is a method in which one or more of these treatments are performed using an oxidizing agent such as peracetic acid to graft a monomer that forms an ion exchanger and support the monomer. Among these treatments, radiation irradiation, particularly a method using an electron beam or cobalt-60 as a radiation source, is effective and preferred.

Specifically, for example, after irradiating polyester (support) with ionizing radiation, a graft polymer is obtained by reacting with an aqueous solution of acrylic acid and/or methacrylic acid, and this is then treated with an aqueous sodium hydroxide solution. Ion exchange fibers are obtained.

Another method is to make the support support the ion exchanger through a polymer layer (adhesive layer) that has a high affinity for the ion exchanger. In this method, first, a monomer forming an adhesive layer between the support and the ion exchanger is graft-polymerized.

As the monomer forming the adhesive layer, a polymer whose polymer has high affinity or adhesiveness to the ion exchanger is used. For example, olefin monomers such as propylene, halogenated vinyl monomers such as vinyl chloride,
Styrene derivatives, monomers with nitrile groups such as acrylonitrile, diene monomers such as butadiene,
There are monomers with acid esters such as vinyl acetate and ethyl acrylate. These monomers are subjected to gelabut polymerization on the support by means such as irradiation with ionizing radiation and/or treatment with an oxidizing agent as described above. As a method of implementation, the support is pretreated in advance by these means and then impregnated with the monomer solution to be grafted and polymerized, or in the case of ultraviolet rays or radiation, the support is impregnated with the monomer solution. You can also irradiate with

Next, the ion exchanger is supported on a support.

This method varies depending on the type of ion exchanger, its manufacturing method, etc., but is carried out, for example, as follows.

The raw material monomer mixture of the ion exchanger is impregnated into a support before poly(condensation), and the monomer mixture is poly(condensed) after impregnation, or an initial state in which the monomer mixture is partially polypolymerized in advance The poly(condensation) polymer is impregnated onto the support as it is or dissolved in an appropriate solvent as necessary, and after the impregnation, the poly(condensation) polymer is
Complete the condensation. The advantage of this method is that the support contains a graft polymer with a high affinity for the ion exchange forming monomer, so the monomer mixture or its initial polymerization (condensation)
The adhesive layer of the support is swollen or dissolved by the metal material, and impregnation is sufficiently carried out. As a result, the subsequent polymerization of the monomer mixture or its initial poly(condensation) metal product provides a structure in which the polymer is closely integrated with the support via the graft polymerization layer.

If the polymer impregnated into the support and polymerized does not have sufficient ion exchange groups, cation or anion exchange groups are subsequently introduced to obtain ion exchange fibers.

Next, as another method, a side chain having styrene or a compound thereof such as hydroxystyrene as a main component is grafted to the above-mentioned support, and a graft copolymer partially crosslinked and networked with a diene compound is ionized. There is a method of introducing an exchange group.

Diene compounds for crosslinking and reticulation include compounds having two or more polymerizable double bonds in the molecule, such as divinylbenzene, isoprene, butadiene, cyclopentadiene, etc., as well as diol esters of acrylic acid or methacrylic acid, Divinyl ester of adipic acid and the like are used.

In this method, first, a side chain containing styrene (or its compound) as a main component is grafted onto the main chain of a support, and a graft copolymer partially crosslinked with a diene compound is created. The polyolefin is irradiated with ionizing radiation, and the polyolefin is immersed in a solution containing a hydroxystyrene monomer and a diene compound monomer to perform a graft polymerization reaction.

Next, ion exchange groups are introduced. For example, the introduction of a sulfonic group is carried out by sulfonating the graft copolymer using concentrated sulfuric acid, sulfuric anhydride, chlorosulfonic acid, etc. in the presence or absence of a solvent. . In addition, the introduction of quaternary ammonium groups can be achieved by first reacting the graft copolymer with a secondary amine and an aldehyde-based reactant such as formalin or paraformaldehyde in an appropriate solvent to transform the hydroxystyrene side chain into a tertiary ammonium group. An aminomethylated graft copolymer is obtained. Next, this is treated with a quaternary compound using a halide or dialkyl sulfate.
A graft copolymer having a quaternary ammonium group introduced therein is obtained.

In this way, ion exchange fibers are produced.

The diameter of the ion exchange fiber is 1 to 1,000 IIm, preferably 5 to 200 μm, and can be determined as appropriate depending on the type of product, use, etc.

Ion exchange fiber weaving methods include twill weave, plain weave,
Sateen weaving and the like are possible, and the ion-exchange fibers can be used alone, or by blending them with ordinary materials such as polyester fibers, or by interweaving them with polyester fibers.

In the case of blended or mixed weaving, the ratio of normal material to ion-exchange fiber is preferably 1)5 (weight ratio) or more of normal material/ion-exchange fiber, and is determined by law as appropriate depending on the type of product, application, economic efficiency, etc. Rukoto can.

Ratio of ion exchange fiber used (ratio to normal material)
For example, in wall materials used in workplaces where static electricity is generated, the proportion of ion-exchange fibers may be increased (in some cases, 100%). It is better to use %).

As for yarn usage, the front side is made of the fabric according to the present invention, for example, polyester and ion exchange fiber (weight ratio of 1 to 1), and the back side is made of a blended yarn of ordinary polyester and cellulose (1) (weight ratio of 1). It is also possible to improve the feeling of wearing on the skin by using cellulose blend yarn.

If dust-free and sterile clothing has a front or back side, there are no restrictions on the use of ion-exchange fibers on the front or back side, and regulations can be applied as appropriate depending on the type of product, use, etc.

In addition, it is particularly preferable to use a fabric made of a combination of ion exchange fibers that support a cation exchanger (cation exchange fiber) and those that support an anion exchanger (anion exchange fiber), and the fabric surface Because it is electrically neutralized, the amount of dust adhering to the fabric is greatly reduced, and almost no static electricity is generated, making it an extremely excellent dust-free and sterile garment for use in high-purity clean rooms. be.

Furthermore, fabrics made from blended yarns of anionic and/or cationic exchange fibers and appropriate conventional fibers, such as polyester fibers, or fabrics made from blends of these fibers combine the advantages of ion exchange fibers and conventional fibers. It is a dust-free and sterile fabric, and in addition to being dust-proof and preventing static electricity generation, it also has the advantage of improving abrasion resistance and aesthetic appearance, making it ideal for a variety of uses. This is something that can be obtained.

〔Example〕

Ion exchange fiber (anion fiber/
Cation fiber: l/1, weight ratio) was twilled with regular polyester fiber (10 μm) (ion exchange fiber/polyester fiber: l/1, weight ratio), and dust generation tests and electrostatic chargeability tests were carried out along with commercially available products. I did it.

1. Dust generation test method: The sample cloth was rubbed with the tip of the sample tube of the measuring device at a position 1.9 m away from the air sampler in the clean room toward the air return unit, and the sample air was measured.

Note that a particle counter was used as the measuring device.

(The following is a blank space) Results: From the above table, it can be seen that according to the product of the present invention, the amount of dust generated from the fabric is significantly reduced compared to the conventional product.

2. Charging property test method: The relative humidity is varied from 20 to 60%, and the charging potential of each sample is measured. The results are shown in the drawing.

From the drawings, it can be seen that with the product of the present invention, the risk of static electricity generation from the fabric is drastically reduced compared to the conventional product.

3. Manufacturing method of ion-exchange fiber ■Anion-type exchange fiber: A fibrous polyester was irradiated with an electron beam of 20 Mrad in nitrogen, and then immersed in a solution containing hydroxystyrene monomer and isoprene to perform a graft polymerization reaction. After the reaction, quaternary amination was performed to obtain an anion exchange fiber.

(2) Cation type exchanged fiber: A fibrous polyester was irradiated with an electron beam of 20' Mrad in nitrogen, and then immersed in an aqueous acrylic acid solution to perform a graft polymerization reaction. The reaction product was treated with a sodium hydroxide solution to obtain a cationic exchange fiber.

〔Effect of the invention〕

According to the present invention, as a result of the electric force of the ion-exchange fiber acting on dust-generating substances, the amount of dust generated from fabrics and from inside clothes etc. is significantly reduced compared to conventional products. It has the appearance of being a dust-free and sterile fabric that meets current requirements.

[Brief explanation of the drawing]

The drawing is a graph showing the results of an example of the present invention.

Claims (8)

[Claims] (1) A dust-free and sterile fabric characterized by containing ion exchange fibers in which natural fibers or synthetic fibers support an ion exchanger. (2) The dust-free and sterile fabric according to claim (1), in which the ion exchange fibers include both a cation exchanger-supported fiber and an anion exchanger-supported fiber. (3) The dust-free and sterile fabric according to claim (1), wherein the ion exchange fiber supports an ion exchanger having both a cation exchange group and an anion exchange group. (4) The dust-free and sterile fabric according to claim (1), (2), or (3), which is composed of a blended yarn of the ion exchange fiber and synthetic fiber. (5) Claim (1), which is constructed as a woven product of the ion exchange fiber and natural fiber or synthetic fiber;
The dust-free and sterile fabric described in paragraph (2) or (3). (6) The ion exchange fiber is made by supporting an ion exchanger on a polyester fiber.
) The dust-free and sterile fabric described in any one of paragraphs (5) to (5). (7) The ion exchange fiber is obtained by graft polymerizing an ion exchanger to a natural fiber or a synthetic fiber. Dust and sterile fabrics. (8) The dust-free and sterile fabric according to claim (7), wherein the ion-exchange fiber is obtained by graft-polymerizing an ion exchanger onto a natural fiber or a synthetic fiber using a radiation irradiation method.