JPH0248669B2 - TSUKISEIBOSUISEISOZAINOSEIZOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to breathable and waterproof polyurethane coated fabrics. Furthermore, the present invention relates to a polyurethane coated cloth whose manufacturing method is easier than ever before, and whose adhesive strength between the polyurethane layer and the base material is extremely excellent. Many proposals have been made regarding coating fabrics that are breathable or moisture permeable and waterproof. For example, a method called a wet coagulation method in which a polyurethane solution in an organic solvent is coated on a base material and then the solvent is removed in a coagulation bath such as water to form a microporous film, a foamed water-based urethane resin, There is a method in which a water-based acrylic resin is coated through a metal screen, and a method in which a molded product of tetrafluoroethylene resin is rapidly stretched, fibrillated, and heat-set, and a porous body is bonded to cloth or the like. A common drawback of these conventional methods is that the manufacturing process for forming a microporous film is very complicated, it is difficult to form a film with a stable pore size, and the cost is considerably high. Furthermore, since the entire film is microporous, the strength of the film is extremely lower than that of a non-porous film made of the same material, which limits the handling and use of the product. In addition, porous films are opaque and cannot be used as a surface layer in clothing applications, but are generally used as inner layers, resulting in disadvantages such as texture. Furthermore, the adhesive strength between the porous film obtained by these methods and the base material is weak due to the manufacturing process, and there is a problem in terms of durability. The present invention improves the above-mentioned drawbacks and relates to a breathable and waterproof polyurethane-coated cloth that is transparent, has excellent film strength, and has excellent adhesive strength to a base material. That is, the present invention provides a three-layer laminate in which a resin layer mainly composed of a polyurethane polymer, a removable resin layer or a mold release material, and an adhesive resin layer of 10μ or less are formed on both sides of the resin layer, in a laminated state. From the adhesive resin layer side, a small hole with a depth that at least penetrates the polyurethane polymer is formed, and the adhesive resin layer surface and the fiber base material,
This is a method for producing a breathable waterproof material, which is characterized by stacking a breathable base material such as a nonwoven fabric or paper and hot pressing at a temperature equal to or higher than the melting point of the adhesive resin. The first feature of the present invention is that small holes are formed in a laminated state of a resin layer mainly composed of polyurethane polymer and a removable resin layer or a mold release layer.
When forming small holes in a resin layer mainly made of polyurethane polymer, they are penetrated with a needle roll, etc.
In this case, if a resin with high elongation such as polyurethane resin passes through the needle roll, it will not stretch at the needle tip and penetrate, but when laminated with a release layer, the release layer acts as a backing and prevents the polyurethane resin from elongating. However, small holes are easily formed. In this way, once a uniform polyurethane film is created, small pores are formed.
The strength of the film is much stronger than that of a microporous film produced by wet coagulation or the like. In addition, the second feature is that the adhesive resin layer is placed on a breathable base material such as a fiber base material, nonwoven fabric, paper, etc., and heat pressed at a temperature higher than the melting point of the adhesive resin.
The small pores of this adhesive resin are maintained, the adhesive resin penetrates into the breathable base material, and the adhesion with the polyurethane resin layer is improved, and the adhesive strength is several times higher than before hot pressing. . The present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a laminate 3 consisting of a resin layer 1 mainly made of polyurethane polymer, a peelable resin layer 2, and an adhesive resin layer 5. Here, the thickness of the resin layer 1 mainly made of polyurethane resin is 1 to 50 μm, preferably 1 to 20 μm.
It is. If it is 50μ or more, it becomes difficult to make holes with a needle roll, and the texture also deteriorates. In addition, it is difficult to process a uniform resin layer of 1μ or less,
The water pressure resistance, which indicates waterproofness, is also low, which deviates from the gist of the present invention. As the resin layer 1 mainly composed of polyurethane polymer and the releasable resin layer or release material 2, polyolefin resin such as polyethylene or polypropylene or release paper prepared by applying a silicone release agent to paper can be used. The adhesive resin layer 5 is a resin that has sufficient adhesion to the resin layer 1 mainly composed of a polyurethane polymer, and further has a lower melting point than the resin layer 1 mainly composed of a polyurethane polymer. in particular,
Consists of one selected from copolymerized polyester and copolymerized polyamide. Examples of the copolymerized polyester include terephthalic acid, isophthalic acid, adipic acid,
Copolyester obtained by condensation of ethylene glycol, propylene glycol, etc. as an alcohol component and polyester with a long chain soft segment made of alkylene ether/
There are polyether block copolymers. Copolymerized polyamides include caprolactam/laurinlactam copolymer, laurinlactam/hexamethylene diammonium adipate copolymer, caprolactam/hexamethylene diammonium adipate/hexamethylene diammonium sebatate copolymer, ethylene diammonium adipate/
Examples include hexamethylene diammonium adipate copolymer, caprolactam/hexamethylene diammonium adipate/hexamethylene diammonium sebatate copolymer, polymethaxylylene adivamide copolymer, and the like. This laminate 3 can also be manufactured by coating the release layer 2 with an organic solvent solution of the resin 1 mainly composed of a polyurethane polymer, drying it, and further coating the adhesive resin 5; It is preferable to form three layers at the same time by coextruding resin 1, which mainly consists of coalescing, peelable resin 2, and adhesive resin 5. In general, the viscosity of thermoplastic polyurethane resins when melted has a very large temperature dependence, and its processing range is narrow, and it is particularly difficult to extrude a thin layer of 30 μm or less as a single layer. However, by laminating and extruding polyolefin-based resins such as polypropylene and polyethylene, which have excellent processability, using a co-extrusion method, the polyolefin-based resin becomes a supporting layer, greatly improving processability and forming an ultra-thin layer of 10μ or less. It also becomes easier. Forming small holes 4 in the laminate obtained as described above is achieved by passing the cylindrical roll over a needle roll having needle-like protrusions on the entire surface (fourth
(see figure). Next, as shown in FIG. 2, the second step is to bond the laminate 3 having small holes obtained in the first step with the breathable base material 6 such as a fiber base material, nonwoven fabric, paper, etc. by heat pressing. becomes. The breathable base material 6 is nylon, polyester,
Cloths such as acrylic, cotton, and blended fabrics thereof, nonwoven fabrics such as polypropylene, nylon, and polyester, and even general thin paper may be used depending on the purpose. The bonding is performed by hot pressing at a temperature higher than the melting point of the adhesive resin 5. The heat press process is the most important process in the present invention,
As a result, the adhesive resin 5 permeates into the breathable base material 6 and stronger adhesive force is obtained.
The peelable resin or mold release material 2 is peeled off before or after this hot pressing. (FIG. 3) The present invention will be explained below with reference to Examples. Example 1 Polypropylene (Mitsui Petrochemical Industries: F631) and polyester polyurethane (Nippon Elastran: Elastran) were produced by coextrusion method.
E180PNAT), adhesive resin (Fuji Photo Film: Staphyx PLC), respectively.
Three-layer laminated films with thicknesses of 30μ, 5μ, and 3μ were made and passed through a needle roll to form small holes that penetrated the adhesive resin layer and the polyurethane layer. Next are the adhesive resin layer and the base material. When the polyester-cotton blend cloth was hot pressed at 125° C. and 5 kg/cm ² for 10 seconds, a material for a sports parka with a good feel and the physical properties shown in Table 1 was obtained. 【table】

[Brief explanation of drawings]

The drawings show embodiments of the invention, and FIGS. 1 to 3 are cross-sectional views showing steps of the invention. FIG. 4 is an explanatory diagram showing the process of forming small holes. 1...Resin layer mainly composed of polyurethane polymer, 2...Peelable resin or mold release material, 3...Laminated body, 4...Small pores, 5...Adhesive resin, 6...Breathable base material, 7...Needle roll.

Claims (1)

[Claims] 1. On both sides of the resin layer mainly composed of polyurethane polymer, a resin layer or mold release material that is releasable from this,
A three-layer laminate with an adhesive resin layer of 10μ or less is formed with a small hole having a depth that penetrates at least the resin layer mainly composed of polyurethane polymer from the adhesive resin layer side in a laminated state to improve adhesiveness. A method for producing a breathable waterproof material, which comprises stacking a resin layer surface and a breathable base material such as a fiber base material, nonwoven fabric, or paper, and heat-pressing the resin layer at a temperature equal to or higher than the melting point of the adhesive resin.