JPH0124625B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a stretch clothing material suitable for sports clothing using polyurethane elastic fiber nonwoven fabric. PRIOR ART In recent years, the development of materials for sports clothing has been remarkable, and particularly the development of stretch materials has been remarkable. Typical stretch materials are polyester or nylon filaments used as stretch yarns (usually false twisted yarns), which are then knitted and dyed in circular knit fabrics, and circular fabrics with polyurethane elastic yarns (so-called spandex) inserted. There are knitted fabrics, tricots using polyurethane elastic yarns as back yarns and nylon filaments as fillet yarns (so-called two-way tricots, usually knitted in a half structure), and fabrics woven with the above-mentioned stretch processed yarns. Each of these materials is, of course, extremely useful in the field suited to the characteristics it possesses, but it does not possess the following properties. Completely windproof Completely waterproof One way to provide these properties to conventional stretch materials is to laminate the above materials with a stretch film, but this also has the following major problems: It was hot. In other words, when sewing clothing into clothing, the fabric expands and contracts, so the holes in the seams of the film gradually become larger, which not only tends to damage the appearance, but also requires complete sealing of the seams in order to make the film completely waterproof. It is difficult to process the material with stretch properties. Even if it were possible to do so, it would lack durability such as washing resistance, and the part would become hard, degrading the quality of the clothing. A perfect way to overcome this drawback is to make garments without seams by welding, but welding does not apply when using not only natural fibers that do not melt, but also synthetic fibers such as polyester nylon. Processing is extremely difficult;
Even if it were possible to fuse, the welded part would be extremely rough and brittle, and the strength of the welded part would be low, making it impractical. Purpose of the Invention The present invention has stretch properties suitable for sports clothing, is suitable for producing clothing by a fusion method such as welding, and has a fused part of the resulting clothing that is flexible and comfortable to wear. The aim is to provide completely waterproof and windproof materials. Structure of the Invention The clothing material of the present invention is a polyurethane elastic fiber nonwoven fabric in which molten polyurethane elastic filaments are laminated without being substantially bundled, and the mutual contact points of the laminated filaments are joined by the filaments themselves. and a stretchable clothing material in which a polyurethane elastic film is integrated with an adhesive. As the polyurethane elastic body constituting the nonwoven fabric applied to the present invention, a known melt-spuntable thermoplastic polyurethane elastic body is used. Such polyurethane elastomers usually contain a low melting point polyol with a molecular weight of 500 to 6000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, etc., and an organic diisocyanate with a molecular weight of 500 or less, such as p-p'-diphenylmethane. Diisocyanate, tolylene diisocyanate, isophorodiisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate,
2,6-diisocyanate methyl caproate,
Hexamethylene diisocyanate etc. and molecular weight
500 polymers obtained by reaction with chain extenders such as glycols, amino alcohols or triols. Of these polymers,
Particularly good are polyurethanes using polytetramethylene glycol, polyε-caprolactone or polybutylene adipate as the polyol. Moreover, p,p-diphenylmethane diisocyanate is suitable as the organic diisocyanate. Moreover, 1,4-bishydroxyethoxybenzene and 1,4-butanediol are suitable as chain extenders. The polyurethane elastomer is synthesized from a polyol, an organic diisocyanate, and a chain extender as described above, but polyurethane elastomers are preferably used in the present invention when the polyol component accounts for 65% or more of the total weight, and in particular A preferable content is 68% by weight or more; if the content of the polyol component is low, the elongation and elongation modulus of the resulting nonwoven fabric will be low. These polyurethane elastomers may contain plasticizers, pigments, stabilizers, and the like. The nonwoven fabric used in the present invention uses the thermoplastic polyurethane elastomer described above as the polymer, but more preferably, a polyisocyanate compound is added to the molten polyurethane elastomer, kneaded, and then discharged from a spinning nozzle. . The nonwoven fabric used in the present invention is a fabric in which polyurethane elastic filaments are spread and laminated over substantially the entire length of the yarn without convergence. If the monofilaments are joined in a bundled state without being opened, the flexibility of the nonwoven fabric will be significantly impaired. Also, the diameter of this monofilament is usually average
50 microns or less, preferably an average of 30 microns or less, etc., preferably 20 microns or less. The diameter of the monofilament may vary, but it is preferably 70 microns or less at most. As the fiber diameter of the monofilament increases, the nonwoven fabric becomes rough and rigid. The nonwoven fabric applied to the present invention is one in which polyurethane elastic filaments are laminated, and the contact points between the fibers constituting this laminate are joined by the fibers themselves, preferably at least half of the contact points, preferably at least 80% of the contact points. , most preferably approximately 100% bonded. Such a bonded state can be achieved by thermally fusing the polyurethane elastic fibers together. Methods using solvents or other adhesives are not preferred because they reduce the air permeability and flexibility of the nonwoven fabric. However, an adhesive may be used in combination without impairing these properties. One of the important features of the nonwoven fabric applied to the present invention is that the nonwoven fabric has extremely high breaking strength and elongation, and has excellent elastic performance. This is because it directly reflects the performance of the polyurethane elastic fibers that make up the nonwoven fabric, and conventionally known nonwoven fabrics made of inelastic polymers and nonwoven fabrics made of polymers with poor elastic performance such as polyester ether elastomer are polyester. This is a performance that cannot be obtained with synthetic rubber foam sheets. The elongation at break of the nonwoven fabric applied to the present invention is usually 300% or more, preferably 500% or more. Breaking strength varies depending on the thickness of the nonwoven fabric, but is usually 0.4Kg/cm, preferably 1.0Kg/cm.
Kg/cm or more. Also, 100% elongation modulus is usually
It is 85% or more, preferably 90% or more. The strength, elongation, and elongation modulus of a nonwoven fabric vary depending on the adhesive strength of the contact points between the fibers constituting the nonwoven fabric, but the nonwoven fabric used in the present invention has the above-mentioned strength,
Elongation and elongation modulus indicate that the contact points are well bonded. The greatest feature of the nonwoven fabric used in the present invention is that it is extremely flexible. The bending resistance (JISL-1096 45 degree cantilever method) of a nonwoven fabric increases as the basis weight of the nonwoven fabric increases, but the nonwoven fabric used in the present invention has a basis weight of X (g/m ² ) and a bending resistance of When y (mm), y<0.2X+30, and more preferably y<0.2X+20. This feature is achieved by the physical properties of the polyurethane elastic body, the structure of the nonwoven fabric as described above, and the small diameter of the constituent fibers. This was something that could not be achieved with polyurethane nets or sheets manufactured by the method. The polyurethane elastic film used in the present invention can be easily obtained by melt-extrusion (molding with a T-die) method, dry film forming method, or wet film forming method, but the resulting material has good elasticity and flexibility. In order to have practical strength, it is preferable that the thickness of the film be relatively thin, between 5μ and 30μ.
It is preferable to produce the film by a dry film forming method or a wet film forming method. Dry film produced by the dry film forming method is produced by applying a polyurethane elastomer dissolved in a solvent onto a release paper using a knife doctor, etc., and then drying it, and the resulting material has good elasticity and flexibility. In order to ensure this, the 100% modulus of the polyurethane elastic body used is 40Kg/ ^cm2 or more and 100Kg/ ^cm2 or less,
It is sufficient to use a material with a tensile strength of 450 kg/cm ² or more. Various types of such polyurethane elastomers are sold by polyurethane elastomer manufacturers, and elastomers with the required numerical values can be easily obtained. Wet film is made by coating nylon taffeta or polyester taffeta, which has been treated with silicone to improve releasability, in the same way as dry film, and then immersing it in water to solidify the polyurethane into a film (so-called wet regeneration). can get. As mentioned above, the wet film has low mechanical strength due to its microporosity, but is effective in imparting moisture permeability to the material of the present invention. Various types of polyurethane elastomers for wet film are commercially available, and it is preferable to use one with 100% modulus and tensile strength similar to that for dry film, and such elastomers are easily available. The adhesive 3 for integrating the polyurethane elastic fiber nonwoven fabric 1 of the present invention and the polyurethane film 2 shown in FIGS. 1 and 2 is an adhesive for dry synthetic leather;
In particular, it is preferable to use a two-component type thermosetting urethane elastomer. There are many types of such adhesives on the market, but in order not to impair the stretchability and flexibility of the resulting material, one with a relatively low 100% modulus is usually used.
Use Kg/cm ² or more and 50Kg/cm ² or less. Since the nonwoven fabric and film to be integrated are both polyurethane elastic bodies, integration using adhesive is extremely easy, and the amount of adhesive used is 5 g/m ² or more.
40g/m ² or less, preferably 10g/m ² or more 25g/m ²
When the following conditions are met, a material with sufficient adhesion strength and flexibility can be obtained. Another major feature of the material of the present invention is that it is lightweight despite its volume. That is, if only a polyurethane elastic film is used, it will naturally be thick and heavy in order to provide a volume suitable for clothing, but in the case of the present invention, a polyurethane elastic film and a polyurethane elastic fiber nonwoven fabric are combined. Therefore, it becomes rich in volume (thickness). From this point of view, the thickness of the polyurethane elastic film may be thin, but from the viewpoint of the film's abrasion strength and resistance to snagging, it is appropriate to have a thickness of 5μ or more, preferably 7μ or more, from the viewpoint of weight reduction and flexibility. If you use a film with a diameter of 30μ or less, it will be easier to take advantage of the features of this material. The material of the present invention can be used for windbreakers, squeegee jackets, yacht parkas, leotards, etc. In this case, if the material is provided with moisture permeability, it will be less likely to get stuffy and will be more comfortable. In this case, the moisture permeability is
1500g/m ² , preferably 2000g/m ² for 24 hours or more,
If it stays for more than 24 hours, it won't get stuffy. (Measurement method JISZ0208
(Measurement temperature and humidity: 40° C., 90% RH, moisture absorption time: 4 hours) Methods for imparting moisture permeability to the material of the present invention include the use of a dry film and a wet film as described above. The former method is as disclosed in Japanese Unexamined Patent Publication No. 59-53786. That is, there is a method of addition polymerizing N-carboxy amino acid anhydride such as glutamic acid-γ-methyl ester-N-carboxylic acid anhydride to polyurethane, and an amino acid modification rate of 2 to 20% is preferable; It is preferable to use it as a film with a thickness of 20μ. From the above description, it can be easily understood that in the case of the material of the present invention, since the polyurethane elastic film and nonwoven fabric are integrated, fusion sewing (welder processing, etc.) is extremely easy to perform. When making clothing, the film side is often used as the front side.
The polyurethane elastic non-woven fabric on the back has a high coefficient of friction and may be uncomfortable to wear, but it is better to use a polyurethane elastic non-woven fabric that has been embossed into dots to give it an uneven surface. Effects As is clear from the above description, the material of the present invention is a novel material that has not existed before, and I think it is understood that it has extremely useful performance, but to summarize it once again, it is as follows. 1. Completely waterproof and windproof material with excellent stretch, flexibility, and light weight. 2. Can be fused and sewn, and since the main component is polyurethane elastic, the fused part does not become rough and hard and feels good to the touch. Example 1 Polybutylene adipate with a molecular weight of 1500, pp'-
Diphenylmethane diisocyanate and 1,4
- A thermoplastic polyurethane elastomer synthesized from butanediol was melted, and 10% by weight of a polyisocyanate compound synthesized from polybutylene adipate with a molecular weight of 1000 and twice the mole of p, p'-diphenylmethane diisocyanate was added and kneaded. After that, it is discharged from the nozzle of the melt blow spinning device and after spinning it is 100%
A nonwoven fabric having the properties shown in Table 1 when heat treated at ℃ for 3 hours was obtained.

【table】

[Table] In each case, monofilaments of polyurethane elastic fibers were opened and stacked, and the intertwining points between the filaments were joined to each other by fusion. 1st
Table 2 shows the physical properties of various elastic materials of the present invention obtained by integrating a dry polyurethane film with the polyurethane elastic nonwoven fabric shown in the table as follows. Urethane elastic body manufactured by Dainippon Ink and Chemicals Co., Ltd., Crisbon 6666HV (100% modulus 50Kg/
cm ² , tensile strength 600Kg/cm ² ) with DMF to determine the viscosity.
It is adjusted to 3000 to 6000 cps, coated on release paper with a knife coater, and dried at 120°C to produce films of various thicknesses. Next, the two-component polyurethane Crisbon 4070 (100% Modulus 26) manufactured by Dainippon Ink and Chemicals Co., Ltd.
Kg/cm ² ) 100 parts and crosslinking agent, the company's Crisbon
15 parts of NX was mixed and coated on the above film using a knife coater so that the solid content was 20 g/m ² and dried at 100° C. to obtain an adhesive. Next, the polyurethane elastic fiber nonwoven fabric was superimposed on the adhesive layer and pressed with a pressure roll. This was left in a room at 50° C. for one day and night to age the adhesive to obtain the materials of the present invention as shown in Table 2. As shown in Table 2, it can be seen that the material of the present invention is a waterproof fabric with excellent extensibility. In addition, after stacking two sheets of each material with film sides together, non-woven fabric sides, and film and non-woven fabric sides together, and fusing them to a width of 1.5 mm using a high frequency welder,
The breaking strength of the fused part was measured, but in all cases the fused part was not destroyed, but the material itself was destroyed, making it clear that this material has extremely excellent fusion properties.

[Table] Example 2 A polyurethane elastomer with an amino acid modification rate of 5.1% obtained as in Example 1 described in JP-A No. 59-53786 was diluted with DMF in the same manner as in Example 1 and placed on release paper. Two types of films of 7 μm and 20 μm were obtained by forming a film.Furthermore, an adhesive with an amino acid modification rate of 4.3 obtained as in Example 5 of the same was used at a solid content of 15 g/m ² to form a film of 7μ and 20μ. After each coating was applied thereon, the urethane elastic fiber nonwoven fabric was stacked and integrated in the same manner as in Example 1 to obtain the material of the present invention. Table 3 shows the physical properties of the obtained material. As shown in Table 3, the obtained material is not only excellent in stretchability and waterproofness, but also in moisture permeability.

【table】

【table】 [Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the material of the present invention, and FIG. 2 is a sectional view of the same material. 1 is a polyurethane elastic fiber nonwoven fabric, 2 is a polyurethane elastic film, and 3 is an adhesive.

Claims (1)

[Scope of Claims] 1. A polyurethane elastic fiber nonwoven fabric in which melt-spun polyurethane elastic filaments are laminated without being substantially bundled, and the contact points of the laminated filaments are joined by the filaments themselves; A stretchable clothing material characterized by a polyurethane elastic film integrated with an adhesive. 2. The elastic clothing material according to claim 1, wherein the polyurethane elastic film has a thickness of 5 μm or more and 30 μm or less.