JP4288619B2 - Protective seal tape - Google Patents

Description

  The present invention relates to a protective material for protecting workers handling organic chemical substances and a seal tape used for seams of protective clothing. More specifically, gaseous or liquid organic chemicals that are absorbed from the skin, such as organophosphorus compounds, and adverse effects on the human body, and aerosols such as fine dust, bacteria, and viruses are prevented from entering from seams. The present invention relates to a sealing tape that can effectively protect an operator.

  A waterproof fabric obtained by coating or laminating a film of polyurethane or the like on a fibrous fabric is used for a wide range of applications such as ski wear and outdoor sports wear. Sealing tape is used at the stitched portions of these waterproof clothes for sealing. The seal tape is composed of a two-layer structure in which a hot-melt urethane resin is coated or laminated on a heat-resistant urethane film, or a three-layer structure based on a tricot base. It is not possible to obtain complete protection against substances or aerosols of fine dust, bacteria, viruses, etc. (see Patent Document 1).

  Moreover, the sealing tape which has the fabric and the outstanding adhesiveness and washing durability as a sealing tape is disclosed. This sealing tape is a sealing tape mainly composed of polyurethane consisting of a heat-resistant layer portion and a hot-melt layer portion on the fabric, and has a permeation suppressing ability against gaseous or liquid organic chemicals or harmful fine dust. Not. In the production of protective clothing, the stitching is performed after sewing, so this sealing tape invites gaseous and liquid hazardous chemicals and harmful fine dust from the seam of the sewing part, and wears the wearer. Cannot be protected (see Patent Document 2).

  Further, a waterproofing method using a seal tape for the outer wall material is also disclosed. Such a sealing tape can be waterproofed quickly and easily by sticking it to the cut surface of the outer wall material, but it is not intended for clothing, and it is not capable of permeating gas or liquid organic chemicals and harmful fine dust. Is not specified (see Patent Document 3).

JP 2003-176463 A JP 2002-249730 A JP 2001-115113 A

  The present invention has been made against the background of the problems of the prior art, and the seam of protective clothing is also highly protective against aerosols such as gaseous or liquid organic chemicals, harmful fine dust, bacteria, and viruses. It is providing the sealing tape which has.

  In order to solve the above problems, the present invention has been completed as a result of intensive studies. That is, the present invention is as follows.

1. A sealing tape comprising a barrier layer having a protective property against gaseous and liquid organic chemicals and fine dust, aerosols and the like harmful to human bodies.
2. 2. The sealing tape according to 1 above, wherein the thickness of the sealing tape is 50 μm or more and 300 μm or less.
3. 3. The sealing tape according to 1 or 2 above, wherein the mass of the sealing tape is 20 g / m ² or more and 250 g / m ² or less.
4). 4. The sealing tape as described in any one of 1 to 3 above, wherein the hot melt layer has a thickness of 10 μm or more and 200 μm or less.
5. 5. The seal tape as described in any one of 1 to 4 above, wherein the hot melt layer is made of ester polyurethane.
6). 6. The sealing tape as described in any one of 1 to 5 above, wherein the thickness of the barrier layer is 5 μm or more and 100 μm or less.
7). 7. The sealing tape as described in any one of 1 to 6 above, wherein the barrier layer is an ethylene-vinyl alcohol copolymer.
8). 8. The sealing tape according to any one of 1 to 7 above, wherein a woven fabric, a knitted fabric, or a nonwoven fabric is applied to the barrier layer as a protective layer of the sealing tape.
9. A protective material and a protective garment using the seal tape according to any one of 1 to 8 above.

  The seal tape of the present invention is a seal tape having a barrier layer having a protective property against gaseous and liquid organic chemicals, harmful fine dusts, aerosols, etc., and gaseous from a seam part of protective clothing, There is an advantage that high protection against invasion of liquid organic chemicals, harmful fine dusts, aerosols and the like can be obtained.

Hereinafter, the present invention will be described in detail.
The gaseous and liquid organic chemical substances referred to in the present invention are organic compounds having one or more carbon elements. It is a gaseous chemical substance having a relatively large molecular weight of 50 or more and capable of adsorbing a gas adsorbing substance such as activated carbon. For example, organic phosphorus compounds used for agricultural chemicals, insecticides, herbicides, and general organic solvents such as toluene, methylene chloride, chloroform used for painting work, and the like. Examples of harmful fine dust include radioactive suspended dust.

  As the resin for forming the barrier layer of the seal tape according to the present invention, a resin having a permeation suppressing ability with respect to an organic chemical substance can be used without limitation after film formation. Specifically, cellulose, cellulose derivatives, regenerated cellulose can be used. , Ethylene-vinyl alcohol copolymer (EVA), polyvinyl alcohol, polyacrylate, polyacrylonitrile, polyamide, polyamideimide, polyurethane, polyester, copolymer polyester, polyolefin, polytetrafluoroethylene, rubber, etc. Resins are exemplified. These resins may be used alone or in combination of two or more. Further, a barrier layer formed by laminating two or more kinds of films may be used.

  The resin for forming the barrier layer is a method of forming a single film by a casting method, an extrusion method, an injection molding method, etc., a method of forming a fine fiber nonwoven fabric by a melt blown method, a flash spinning method, an electrospinning method, etc., Examples thereof include a method of coating the substrate with a solution or low polymer of the polymer, drying or polymerizing after coating by dipping or the like.

  These barrier layers may be used alone or in combination, or two or more types of resin layers may be sequentially coated and laminated to form a film. In addition, other additives such as titanium oxide, silica, activated carbon, and zeolite may be added to the resin layer. Moreover, the adsorptive substance may be coated and laminated on one side or both sides of the barrier layer.

  The thickness of the barrier layer used in the present invention is preferably 5 μm or more and 100 μm or less. When the thickness of the seal tape is 5 μm or less, the durability of use is inferior and the performance cannot be maintained due to wear or the like. If it exceeds 100 μm, the feeling of firmness increases, the seal part becomes stiff and the comfort as clothes is impaired. More preferably, they are 10 micrometers or more and 80 micrometers or less.

The mass of the barrier layer is preferably 200 g / m ² or less. This is because, within this range, it is possible to obtain a sealing tape that does not feel stiff without the sealing portion becoming stiff, and does not impair the comfort. More preferably, it is 150 g / m ² or less. The lower limit of the mass is not particularly defined, but is usually 5 g / m ² or more.

  The barrier layer of the present invention may be used alone, but a woven fabric, a knitted fabric, a non-woven fabric or the like may be bonded to the barrier layer as a base material for reinforcing or protecting the barrier layer. In order to obtain a lightweight and flexible sealing tape while maintaining strength, the thickness of the substrate is preferably 0.05 mm or more and 0.50 mm or less.

  As a base material for reinforcing the barrier layer, natural fibers such as cotton, hemp, hair, and silk, regenerated fibers such as rayon, polynosic, cupra, and lyocell, semi-synthetic fibers such as acetate and triacetate, nylon, aramid, vinylon, vinylidene, Examples include woven fabrics, knitted fabrics, and nonwoven fabrics made of synthetic fibers such as polyvinyl chloride, polyester, acrylic, acrylic, polyethylene, polypropylene, polyurethane, polyclar, polyarylate, polyvinyl alcohol, polybenzazole, polyimide, and polyphenylene sulfide. These fibers may be used alone or in combination by blending, union, union, etc. to form a sheet-like fiber assembly. A microporous or nonporous film or membrane may also be used. Examples of the material include polyethylene, polypropylene, polytetrafluoroethylene, copolymer polyester, polyurethane, polyether polyurethane, and acrylate.

  When a base material is provided as a protective layer for the barrier layer, it can be laminated by a laminating method and a coating method while maintaining the flexibility of the material. In the laminating method, it is preferable to bond the seal tape and the base material with a polyurethane-based, acrylate-based emulsion or polyamide-based adhesive. Further, the barrier layer may be welded or fused. As other bonding, it is also possible to perform heat bonding through a low-mass non-woven fabric, network or powder made of low melting point copolyester, polyamide or polyolefin.

  In the present invention, the above-mentioned base material may be subjected to post-processing such as water- and oil-repellent processing and flame-retardant processing. Examples of the water repellent include, but are not limited to, fluorine, polysiloxane, and paraffin.

  The barrier layer having a protective property against gaseous and liquid organic chemical substances and fine particles harmful to the human body, aerosol, etc. in the present invention means a gas permeability concentration of 50 ppm according to the gas permeability test shown in the following examples. The barrier layer is preferably 25 ppm or less, more preferably 0.1 ppm or less (ND).

  The hot melt layer of the present invention is preferably composed of a hot melt adhesive mainly composed of a thermoplastic polyurethane resin obtained by reacting a polyisocyanate and a polyol. Since thermoplastic polyurethane is used as a hot melt adhesive, ester-based polyurethane is preferable from the viewpoint of adhesiveness. The hot melt layer may be used in combination with a heat-resistant agent, an ultraviolet absorber, a pigment, and the like in addition to the polyester-based resin and the polyamide-based resin. The thickness of the hot melt layer is preferably 10 μm or more and 200 μm or less. If the thickness of the hot melt layer is 10 μm or less, the adhesive strength at the time of sealing is insufficient, and if it is 200 μm or more, it becomes stiff after bonding and is not desired. More preferably, they are 20 micrometers or more and 150 micrometers or less.

  When the softening temperature of the hot melt layer is about 50 ° C. to 150 ° C., the fluidity of the resin of the hot melt layer is increased, the adhesive strength with the laminated fabric is improved, and not only the use durability but also the washing durability It is preferable for improvement. More preferably, the softening temperature of the hot melt layer is 70 ° C. or higher and 100 ° C. or lower.

  The seal tape of the present invention may have an adhesive layer and a heat-resistant layer in addition to the barrier layer and the hot melt layer.

  The heat-resistant layer of the present invention is preferably a resin layer mainly composed of polyurethane, and is not particularly limited, such as polyester or polyamide. Moreover, you may use together a heat-resistant agent, a ultraviolet absorber, a pigment, a titanium oxide, a cellulose derivative etc. as an additive. The melting point of the heat-resistant layer is preferably 150 ° C. or higher. If the temperature is lower than 150 ° C., the tape softens at the temperature at which the stitched portion is bonded, and the resin layer may be broken by the pressure during bonding. The heat-resistant layer also serves to suppress the reaction between the adhesive and the hot melt layer. The thickness of the heat resistant layer is preferably 10 μm or more and 60 μm or less. When the thickness of the heat-resistant layer is 10 μm or less, the strength is insufficient and the glass layer is easily damaged. More preferably, they are 20 micrometers or more and 50 micrometers or less.

  The adhesion between the heat-resistant layer and the barrier layer can be laminated by a laminating method and a coating method while maintaining the flexibility of the material. In the laminating method, it is preferable to bond with a polyurethane, acrylate emulsion or polyamide adhesive. The bonding method is not particularly limited, such as full surface bonding or point bonding. It is also possible to thermally bond via a low-weight non-woven fabric, network or powder made of low melting point copolyester, polyamide or polyolefin. Alternatively, a method of welding a part of the barrier layer may be used.

  Although the manufacturing method of the sealing tape of this invention is not specifically limited, A resin solution is apply | coated using a knife over roll coater, and a film is produced by drying after raising temperature at 50 to 110 degreeC after that. What is necessary is just to perform by a well-known method. Specifically, a hot melt type polyurethane and a resin solution obtained by diluting a polyester resin or polyamide resin with an organic solvent are coated on a release paper and dried to prepare a hot melt type film, and a polyurethane for a heat-resistant layer thereon. A resin product is applied, an adhesive is further applied thereon, and a laminated product having a barrier layer adhered thereto is obtained. Then, in order to promote the crosslinking of the adhesive and improve the adhesive strength between the barrier layer and the adhesive, after aging for 2-3 days at room temperature, the laminate is separated from the release paper, and this is desired by a cutter. A method of cutting to a width of may be used. FIG. 1 is a perspective view showing a seal tape of the present invention.

  The width of the seal tape of the present invention is preferably 5 mm or more and 50 mm or less. If the width of the seal tape is 5 mm or less, the stitched portion cannot be completely sealed, and the use durability is also lowered. If it exceeds 50 mm, the feeling of firmness increases and the comfort is impaired. More preferably, it is 10 mm or more and 30 mm or less.

  The total thickness of the seal tape of the present invention is preferably 50 μm or more and 300 μm or less. When the thickness of the seal tape is 50 μm or less, the durability for use and the durability for washing are lowered. If it exceeds 300 μm, the seam portion is stiff, resulting in poor comfort. More preferably, they are 60 micrometers or more and 250 micrometers or less.

The mass of the seal tape of the present invention is preferably 20 g / m ² or more and 250 g / m ² or less. If the mass of the seal tape is 20 g / m ² or less, the durability of use is low, and if it is 250 g / m ² or more, the mass of protective clothing or the like increases, which is not preferable. More preferably, it is 50 g / m ² or more and 200 g / m ² or less.

  It is preferable that the tensile strength of the seal tape of the present invention is 30 N / 3 cm or more in the length direction and 20 N / 3 cm or more in the width direction. When the tensile strength of the seal tape is 30 N / 3 cm or less in the length direction and 20 N / 3 cm or less in the width direction, the workability in the sealing process after sewing is remarkably lowered.

  The tear strength of the seal tape of the present invention is preferably 0.5 N or more in both the length direction and the width direction. If the tear strength of the seal tape is 0.5 N or less in both the length direction and the width direction, the workability in the sealing process after sewing is significantly reduced.

  The elongation at break of the seal tape of the present invention is preferably 30% or more in both the length and width directions. If the elongation at break of the seal tape is 30% or less, the workability in the sealing process after sewing is significantly reduced. More preferably, it is 50% or more.

  EXAMPLES Next, although this invention is demonstrated concretely using an Example and a comparative example, this invention is not restrict | limited by these Examples. The evaluation described in the examples is based on the method described below.

Gas permeability test:
A container diagram used in the test is shown in FIG. The test product is sandwiched between two glass cells having an internal volume of 350 cc, and the periphery is sealed with paraffin. From the upper cell of the test container, 20 μL of 3-methoxybutyl acetate is dropped onto the test product. This is put in a constant temperature box set to 25 ± 2 ° C., the gas concentration on the lower cell side is sampled at regular intervals, and the gas concentration permeating the test product is measured by gas chromatography.

Liquid penetration resistance test:
A schematic diagram of the test is shown in FIG. A filter paper was placed on a glass plate, and the test product of the present invention was placed thereon, and 20 μL of a liquid chemical substance (methyl salicylate in which a red dye was dissolved) was dropped thereon. And that on every weight the predetermined load of the bottom area of ^{1cm 2 (9.8N / cm 2)} , to determine the penetration of the liquid by coloring of the filter paper every predetermined time interval.

Particle collection efficiency measurement:
A schematic diagram of the test is shown in FIG. Using a particle generator pre-adjusted so that the particle loading is 20 mg / m ³ , the test product is installed in a duct with a size of 5φ, while generating a constant wind speed of 3 m / sec, polyalphaolefin particles Was sprayed and measured. The number of polyalphaolefin particles on the upstream and downstream sides of the test product was measured using a particle number measuring device Scanning Mobility Particle Sizer (Model 13936 manufactured by TSI) to measure the particle collection efficiency. The particle collection efficiency was calculated using Equation 1.

Mass: According to JIS L-1018 8.4.

Thickness: According to JIS K-71303.

Breathability: According to JIS L1018 8.33.

Specific surface area: An adsorption isotherm of nitrogen is obtained and calculated by the BET method based on this.

Example 1
The film material was produced by the following method. Cellulose acetate having a degree of acetylation of 55% and a viscosity of 6% 70 × 10 ⁻³ Pa · S (Daicel Chemical Industries, Ltd. L-30) is used, and the solvent is a 1: 1 mixed solution of methyl ethyl ketone and N, N dimethylformamide. A cellulose acetate solution was prepared by mixing and stirring at room temperature so that the solid content concentration was 10 wt%. This solution was cast on a release paper (manufactured by Lintec Corporation), applied while adjusting the film thickness with a coating knife, and dried in an oven. After drying at 70 ° C. for 1 minute, drying was performed at 120 ° C. for 2 minutes. The thickness of the obtained film layer was 20 μm and the mass was 25 g / m ² .

A fibrous activated carbon fabric was produced as a gas adsorption layer by the following method. A plain fabric having a mass of 85 g / m ² made of spun yarn of 2.2 decitex 20th novolak phenol resin fiber is heated in an inert atmosphere at 410 ° C. for 30 minutes and then inerted to 870 ° C. for 20 minutes. Heating was performed in the atmosphere to cause carbonization, and then activation was performed at a temperature of 870 ° C. for 2 hours in an atmosphere containing 12% by volume of water vapor. The mass of the obtained fibrous fibrous activated carbon is 50 g / m ² , specific surface area is 1400 g / m ² , thickness is 0.40 mm, and air permeability is 470 cm ³ / cm ² · s with a pressure difference of 1.27 cm in water level. Met.

A seal tape was produced by the following method. As the barrier layer, Eval EF-XL of Kuraray Co., Ltd., which is an ethylene-vinyl alcohol copolymer, was used. Eval EF-XL had a thickness of 12 μm and a mass of 15 g / m ² . After applying a hot melt layer of ester polyurethane on the release paper to a thickness of 100 μm, drying and solidifying at 100 ° C., one-component polyurethane (Samprene HMP-17A), which is a component of the heat-resistant layer, and titanium oxide And a solution mixed so that the composition ratio of acetyl butyl cellulose becomes 100/18/15 was applied to the hot melt layer so as to have a thickness of 30 μm, and then dried and solidified. Finally, a barrier layer having a thickness of 12 μm was adhered via a two-component polyurethane adhesive (Samprene LQ-120), and aged at 50 ° C. for 2 days to obtain a laminated film. Then, it peeled off from the release paper and was slit so that it might become a width of 20 mm, and it was set as the sealing tape. The thickness of the obtained seal tape was 150 μm and the mass was 179 g / m ² .

The sample for evaluation was prepared by adhering the membrane material and the gas adsorbing layer with a breathable non-woven hot melt adhesive having a mass of 20 g / m ² and a melt index of 60 g / 10 min (DYNAC manufactured by Kureha Tech Co., Ltd.) After two pieces of this material were laid down and stitched together by stitch stitching, a household iron was used and a sealing tape was adhered to the stitched portion at an adhesion temperature of 120 ° C. (FIG. 5). The laminated sample was subjected to a gas permeability test, a liquid permeability test, and a particle collection efficiency measurement. Each result was described in Tables 1-3.

( Reference Example 1 )
In Example 1, a hot melt resin, which is an ester polyurethane, was directly applied to the barrier layer of the seal tape so as to have a thickness of 100 μm, and dried and solidified at 100 ° C. Then, it was slit to a width of 20 mm to obtain a seal tape. The thickness of the obtained seal tape was 110 μm and the mass was 120 g / m ² . This material was subjected to a gas permeability test, a liquid permeability test, and a particle collection efficiency measurement. Each result was described in Tables 1-3.

(Comparative Example 1)
In Example 1, a seal tape using a polyurethane resin for the barrier layer of the seal tape was produced. Using this sealing tape, a gas permeability test, a liquid permeability test, and a particle collection efficiency measurement were performed on a material in which the seam portion of the laminated sample was sealed. Each result was described in Tables 1-3.

(Comparative Example 2)
In Example 1, a sample having only a seam portion to which no seal tape was applied was prepared. This material was subjected to a gas permeability test, a liquid permeability test, and a particle collection efficiency measurement. Each result was described in Tables 1-3.

(Comparative Example 3)
After laminating the membrane material and the gas adsorbing layer, a gas permeability test was conducted using a material sealed with a seam portion of the laminated sample with a high-density woven fabric and a breathable non-woven hot melt adhesive (DYNAC manufactured by Kureha Tech Co., Ltd.) Liquid permeability test and particle collection efficiency measurement were carried out. Each result was described in Tables 1-3.

Example 1 is excellent in gas permeation suppression ability, liquid permeation resistance and particle collection efficiency, and is a desired seal tape, whereas Comparative Example 1 does not have gas permeation suppression ability and liquid resistance performance, Example 2 is a result of low gas permeation suppressing ability, liquid resistance performance and particle collection efficiency, and Comparative Example 3 is a result of no gas permeation suppressing ability and liquid permeation resistance, and a desired seal tape is obtained. There was no result.

  The seal tape of the present invention can protect against gaseous and liquid organic chemicals by using a barrier layer with excellent chemical resistance, and also has high particle removal performance against harmful fine dusts, aerosols, etc. It relates to sealing tape with excellent protective properties, and can be used for protective clothing, protective hoods, protective gloves, protective shoes, agricultural materials, protective tents, medical supplies, etc., and contributes greatly to the industry. .

It is a perspective view which shows the seal tape of this invention. It is the schematic which shows the test container used for a gas-permeability test method. It is the schematic of the testing apparatus used for a liquid permeability measurement. It is the schematic of the test apparatus used for particle collection efficiency measurement. FIG.

Explanation of symbols

1: Barrier layer 2: Adhesive 3: Heat resistant layer 4: Hot melt layer 5: Upper cell (150 cc)
6: Sampling port 7: Test solution 8: Test product 9: Paraffin sealing 10: Lower cell (150 cc)
11: Weight (9.8 N / cm2)
12: Test solution 13: Test product 14: Filter paper 15: Slide glass 16: Blower 17: Particle generator 18: Particle measuring device 19: Test product 20: Gas adsorption layer 21: Membrane material 22: Stitch 23: Seal tape

Claims (9)

From a barrier layer made of an ethylene-vinyl alcohol copolymer resin, polyurethane, acrylate emulsion or polyamide adhesive, or a low melting point copolymer polyester, polyamide, a nonwoven fabric made of polyolefin, a net or powder An adhesive layer, a heat-resistant layer composed of a polyurethane-based resin layer, and a hot-melt adhesive layer composed mainly of a thermoplastic polyurethane resin, and a hot-melt layer composed of at least a four-layer structure. .   The seal tape according to claim 1, wherein the thickness of the seal tape is 50 μm or more and 300 μm or less. The sealing tape according to claim 1 or 2, wherein the sealing tape has a mass of 20 g / m ² or more and 250 g / m ² or less.   The seal tape according to any one of claims 1 to 3, wherein the hot melt layer has a thickness of 10 µm to 200 µm.   The sealing tape according to any one of claims 1 to 4, wherein the hot melt layer is made of ester polyurethane.   The seal tape according to claim 1, wherein the barrier layer has a thickness of 5 μm to 100 μm.   The sealing tape according to any one of claims 1 to 6, wherein a woven fabric, a knitted fabric or a nonwoven fabric is applied to the barrier layer as a protective layer of the sealing tape.   A protective material using the sealing tape according to claim 1.   A protective garment using the sealing tape according to claim 1.