JPS62162518A - Manufacture of moisture-permeability laminated member - Google Patents

Abstract

PURPOSE:To obtain a laminated member having favorable moisture permeability and not having a fine opening, by laminating a thin film of polyamino-acid urethane resin, which hardly permeates gas other than aqueous vapor though the same is permeable to the aqueous vapor favorably, and a permeable base through a specific method. CONSTITUTION:A polyamino-acid urethane resin solution is applied to the surface of a peelable conveying base 1 with a knife coater. Then the same is sent into a drying furnace 4 and a film of polyamino-acid urethane resin, which is to be moisture-permeability film, is formed by drying the same. Then the polyamino-acid urethane resin solution or its solvent 3 is applied to the same as an adhesive agent for lamination of a permeable base 5. After the permeable base 5 has been pressed and laminated, it is introduced into a drying furnace 6 and dried again. A product finished in drying is rolled round and made into the final product 7. A moisture-permeability laminated member having a pinholeless polyamino-acid urethane resin layer is obtained in this manner.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a moisture permeable laminate.

Specifically, it is a lamination of a thin film of a copolymer in which polyurethane molecules are introduced into the molecular chains of polyamino acids that have moisture permeability and hardly allow other gases to pass therethrough, and a breathable base material that serves to reinforce the thin film. The present invention relates to a method of manufacturing a body.

[Conventional technology]

The IV membrane, which is a copolymer in which polyurethane molecules are introduced into the molecular chain of polyamino acids (hereinafter sometimes referred to as "polyamino acid urethane resin"), has the property of allowing water vapor to pass through well but hardly allowing other gases to pass through. Therefore, it is said that it is suitable for use in, for example, sports clothing.

However, this polyamino acid urethane resin film
There are problems with strength and texture (touch), so it cannot be used directly as clothing.

[Problem that the invention seeks to solve]

When applying a thin film of polyamino acid urethane resin to clothing, etc., it is conceivable to use it by laminating it with other cloth-like materials.
For example, when trying to form a Wt film by applying a polyamino acid urethane resin solution to the surface of a cloth-like material, since the cloth-like material is porous and has an uneven surface, holes are formed in the polyamino acid urethane resin film. However, when the polyamino acid urethane resin film is made thicker to prevent pores from forming, there is a problem in that the moisture permeability decreases.

[Means for solving problems]

The inventors of the present invention have conducted various studies to solve the above-mentioned problems, and have found that by laminating a breathable base material and a thin film of polyamino acid urethane resin using a special method, it has good moisture permeability. They discovered that a laminate without defects (such as minute openings) can be obtained, and completed the present invention.

The gist of the present invention is to form a thin film by applying a solution of a copolymer in which polyurethane molecules are introduced into the molecular chains of polyamino acids onto a removable transport substrate with a smooth surface and drying it. , Apply a solution of the copolymer or its solvent included in the package above to the surface of the thin film on the conveyance base material, and laminate an air-permeable differential material (suppressive lamination may be performed) before the coating solution or solvent dries. The present invention relates to a method for manufacturing a moisture permeable laminate, which comprises drying and solidifying the moisture permeable laminate.

An example of the method of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are schematic illustrations of an example of an apparatus used to carry out the method of the present invention.

In the figure, l is a peelable conveyance base material, c is a polyamino acid urethane resin solution, 3 is a polyamino acid urethane resin solution or its solvent, Hiro is a drying oven, S is an air permeable base material, 6 is a drying oven, 7 is a product, g to -〇 indicate rollers, respectively.

In FIG. 1, the releasable conveyance base material / is a general release paper (
A mold release agent (e.g., silicone coated on the surface) may be used; other materials have a smooth surface that has little affinity with the polyamino acid urethane resin to be applied, and the polyamino acid urethane resin can easily peel off the button. You can use the one consisting of

A polyamino acid urethane resin solution is coated onto the smooth, releasable side of the fed releasable transport substrate l using a knife coater to a uniform film thickness iC.

Examples of polyamino acid urethane resins include Tokkai Sho! ;
g-3! ! : Polyamino acid urethane resin copolymerized by the manufacturing method described in Publication No. 10,1, that is, a block copolymer in which boric and tan molecules are introduced into the molecular chain of polyamino acid, and has an incyanate group at the terminal. A product obtained by copolymerizing urethane Grevo'77- and an amino acid-N-carboxylic acid anhydride produced by reacting phosgene with an amino acid or an amino acid ester in the presence of an amine is used.

The weight ratio of amino acid-N-carboxylic acid anhydride and urethane prepolymer is q! : ! ; 5-10:90, preferably qo:1o-7°:90, more preferably go:, 2θ to ko:go. In addition, as long as the properties as a film are not lost,
It may also contain an organic or inorganic third component.

As the solvent, M-organic solvents are preferably used, such as methylene dichloride, ethylene dichloride, chlorinated hydrocarbons such as chloroform, dioxane, tetrahydro7rane, nityls such as diethyl ether, dimethylformamide, dimethylacetamide, etc. be done.

The resin concentration during production of polyamino acid urethane resin is J-Hiro θ
It is in the range of 10 to 30, preferably 10 to 30,000. If the concentration is too low, the viscosity of the resulting resin liquid will be low, and if the concentration is too high, the viscosity will be extremely high and it will become gel-like, making it difficult to obtain a practical product.

Further, the temperature during production of the polyamino acid urethane resin is preferably a temperature at which a high molecular weight polyamino acid can be synthesized from the amino acid-N-carboxylic acid anhydride, and is preferably in the range of 10 to 0.degree. C. for practical purposes. If the temperature is higher than 0'C, it becomes difficult for the amino acid chain to take the form of an α-helix during copolymerization, so the degree of polymerization of the amino acid chain does not increase, and it may be difficult to obtain a resin with a high molecular weight or a viscosity of 1000000000 yen. be.

The resin bath liquid obtained by the above method is emulsified and has a viscosity of
Any viscosity in the range of o cps to 300,000 ape can be obtained.

The polyamino acid urethane resin solution obtained as described above is applied to the surface of the conveyance base material 1 using a knife coater. The thickness M varies depending on the concentration of the bath solution, the required moisture permeability, etc., but in the case of applications such as clothing, it is sufficient to apply the polyamino acid urethane resin so that the dry film thickness is approximately j -40 μm.

Further, in the drawings, the coating means is a knife coater using a doctor knife, but it goes without saying that any other coater such as a roll coater can be used. The applied polyamino acid urethane resin layer is then sent to a drying oven T and dried to ensure that the film does not peel or open holes occur during the press lamination of the reinforcing breathable base material S in the next step. It is sufficient if the film is solidified to a certain degree, and if the film thickness is about -θμn, it is 7
At a temperature of about 0°C / ~ no θ minutes and / at a temperature of about θθ°C /
It is sufficient to carry out two-stage drying for about ~io minutes.

The reason for performing multi-stage drying is to prevent the solvent from boiling over due to rapid drying, thereby preventing the formation of through holes.

In this way, first, a film of polyamino acid urethane resin, which is to become a moisture permeable film, is formed on the transport base material l.

Next, a polyamino acid urethane resin solution or its solvent 3 is further applied to this polyamino acid urethane resin film. The application of this polyamino acid urethane resin solution or its solvent 3 is for laminating the breathable base material S in the next step, and the polyamino acid urethane resin solution or its solvent J is used as an adhesive. resin solution. When used, the thickness is usually about 7 to 10 μm.

Breathable base material! The pressing and lamination must be performed before the applied polyamino acid urethane resin solution dries.

As the breathable base material j, nonwoven fabrics, woven fabrics, paper, various foams, and the like may be used as appropriate depending on the purpose as long as they are breathable and have a certain degree of strength.

After the breathable base materials j are laminated, they are introduced into the drying oven 6 and dried again. This drying is performed to evaporate the solvent from the polyamino acid urethane resin solution or solvent applied later, and also to harden and solidify the entire polyamino acid urethane resin layer to bring the polyamino acid urethane resin layer into close contact with the breathable substrate. ), at a temperature of about 100℃/~IO
All you need to do is dry it for about a minute.

The product that has been dried is wound up to form product 7.

When winding up, the releasable conveyance base material 1 may be peeled off while being wound up, but as shown in FIG. 1, the sheets may be rolled up while being laminated, and the buttons may be peeled off during use.

What is shown in FIG. 1 is an example in which the releasable conveyance base material 1 is formed into an endless belt, and upon winding, the conveyance base material 1 is peeled off and wound up.

As described above, in the method of the present invention, a film of polyamino acid urethane resin having moisture permeability is first formed, and the breathable base material S is laminated thereon. It is possible to obtain a laminate having uniform moisture permeability without forming holes or the like.

Above, we have explained the production of a laminate with a two-layer structure.
When obtaining an N-structure laminate, the polyamino acid urethane resin surfaces of the two-layer laminate obtained as described above face each other, and a polyamino acid urethane resin solution or its solvent is coated on at least one side using a knife coater. This is done by applying it with a roller coater or the like, pressing it, and drying it.

In this case, one of the base materials may not be a laminate, but may be a simple cloth, etc., or a material obtained by simply coating and drying a polyamino acid urethane resin solution or its solvent on a cloth, etc., or It is also possible to simply apply a polyamino acid urethane solution onto a cloth and dry it.

〔Effect of the invention〕

According to the method of the present invention, a moisture permeable laminate having a polyamino acid urethane resin layer without pinholes etc. can be obtained, and can be used for applications requiring moisture permeability such as sports clothing, medical materials such as surgical gowns, etc. A laminate that is practically excellent as a cloth-like material for use in applications requiring moisture permeability and complete blocking of viruses etc. can be obtained.

[Brief explanation of drawings]

! FIG. 2 is a schematic explanatory diagram of an example of an apparatus used to carry out the method of the present invention. In the figure, l is the peelable conveying base material, c is the polyamino acid urethane resin solution, 3 is the polyamino acid urethane resin solution or its solvent, q is the drying oven, j is the breathable base material, O is the drying oven, and ri is the product. Each is shown below. Applicant Mitsubishi Chemical Industries, Ltd. Agent Patent Attorney Hase - (and 7 others)

Claims (1)

[Claims] (1) A solution of a copolymer in which polyurethane molecules are introduced into the molecular chains of polyamino acids is applied onto a peelable carrier substrate with a smooth surface, and then dried to form a thin film. Moisture permeability characterized by applying a solution of the same type of copolymer or its solvent to the surface of the thin film on the material, and drying and solidifying after laminating a breathable base material before the coating solution or solvent dries. Method for manufacturing a laminate.