JPH05247848A - Processing of raising fabric - Google Patents

Abstract

PURPOSE:To provide a processing method for producing a raising fabric having excellent moisture-transmission performance and windbreak performance. CONSTITUTION:A woven or knit synthetic fiber fabric is impregnated or coated with a solution of a synthetic polymer resin composed mainly of a polyurethane resin containing >=1% silicon dioxide fine powder having essentially non-porous structure and an average particle diameter of <=0.1mum and the impregnated or coated fabric is subjected to raising treatment after wetcoagulation of the solution. A raising fabric having excellent moisture-transmission and windbreak performance and giving soft feeling to the body can be produced by this process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for producing a moisture-permeable and windproof raised fabric which has two functions of moisture permeability and windproof property and has a soft texture.

[0002]

2. Description of the Related Art A woven fabric or knitted fabric made of ultrafine fibers is napped, and a urethane resin or a softening agent is added to the fabric to give a soft texture and windproof performance. Since the strength of the napped fabric made of is weak as a fabric, a large amount of urethane resin is often used due to the need to maintain strength, and windproof performance is obtained, but moisture permeability is sacrificed. The drawback is that it is easy. In addition, by using a large amount of urethane resin, the feel becomes rubber-like, and a large amount of adhesion between the fluffs of the raised fabric occurs. In order to improve this condition, sand rolls, sand belts, emery raising machines, etc. are used. However, when using these machines, the number of raising times is increased in order to soften the texture. Since it is unavoidable, it causes a decrease in strength. If the number of times of raising is reduced, the fluffing cannot be resolved and the texture does not become soft.

Further, a processing method using a combination of rubbing work in liquid and rubbing work in a finishing machine is also used. However, although the texture is slightly soft, the work for improving the moisture permeability is improved. Not the way. Moreover, the combination of rubbing in liquid and rubbing in a finishing machine is disadvantageous in terms of cost. Generally, it is very difficult to satisfy the performance of both because the moisture permeability and the windproof property are mutually contradictory functions.

[0004] Generally, a raised fabric (hereinafter referred to as a moisture permeable and windproof raised fabric) which has a windproof performance of 1 cc / cm ² / sec or less according to JIS L-1096 and has a good moisture permeability. In order to obtain the above, a method of forming a resin having fine pores continuous in the thickness direction of the cloth on the raised cloth is adopted, and as the resin, urethane elastomer is used in terms of film strength, rubber elasticity and flexibility. Considered preferable. At present, there is no product that can be said to be a breathable and windproof raised fabric on the market, and the current windproof raised fabric has a moisture permeability of 3%.
The limit is 000 to 4000 g / m ² · 24 hr. Therefore, using porous type urethane resin, air permeability is 1cc
/ Cm ² / sec. A breathable and windproof raised fabric was made on a trial basis, and the moisture vapor transmission rate was evaluated. At best, 6000 g / m ² · 24 hr (JIS L-109
Only about 9) was obtained. If this level of moisture permeability can be improved to 8000 g / m ² · 24 hr or more, it will have almost the same moisture permeability as that of a commercially available brushed fabric that does not have windproof properties. The temperature control of the air conditioner can be performed smoothly and you can exercise and work comfortably, but unfortunately it has a windbreak performance of less than 1 cc / cm ² / sec and 8000g / m ² -The fact is that a raised fabric having a moisture permeability of 24 hours or more has not been obtained.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation as described above, and uses a napped fabric mainly composed of synthetic fibers, which has excellent moisture permeability and windproof performance.
Moreover, the object is to produce a breathable and windproof raised fabric having a soft texture.

[0006]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention provides a raised fabric mainly made of synthetic fibers,
Fabrication of napped fabric characterized by applying a synthetic polymer mainly composed of polyurethane resin containing 1% or more of fine particles of silicon dioxide having an average particle size of 0.1 μm or less, wet coagulating, and then subjecting to an emery nap treatment The method is the gist.

The present invention will be described in detail below.

The napped fabric used in the present invention is a woven fabric mainly made of synthetic fibers such as polyester fibers and nylon fibers, and a woven fabric on one or both sides of which fluff is generated by raising or the like. The yarns that make up the fabric are formed of short fibers or long fibers of synthetic fibers such as polyester fibers and polyamide fibers, either alone or in combination. In the case of synthetic fiber, it is particularly preferable to use an ultrafine fiber of 1 d or less because it is close to natural suede in terms of appearance, touch, finger marks, texture, etc. and gives a high-class feeling.

The nap here means a state in which fluff is positively pulled out from the surface of the woven or knitted fabric by a cloth roll, a sand roll, a sand belt, etc., or a loop is shaved.

In the present invention, a solution in which fine silicon dioxide powder is uniformly dispersed in a polar organic solvent solution of a synthetic polymer mainly composed of polyurethane resin is applied to the cloth as described above by a method such as impregnation, spraying or coating. ..

The substantially non-porous silicon dioxide fine powder used in the present invention is generally a silicon dioxide obtained by a dry method such as a gas-phase oxidation method of silicon halide, a combustion hydrolysis method of silicon halide, or an electric arc method. The fine powder obtained by the above method is a hydrophilic substance because it has a large number of silanol groups on the particle surface like other general silicon dioxide fine powders. In the present invention, silicon dioxide fine powder having a large number of silanol groups on the particle surface has sufficient effect, but this hydrophilic silicon dioxide fine powder is uniformly dispersed in a polyurethane polymer-based synthetic polymer solution. Since the resin solution tends to be highly viscous thixotropic and easily adsorbs water, care must be taken in coating operation. Also, since the resin film obtained is hydrophilized, it may be slightly leaked. Cause the disadvantage of. In order to make up for these drawbacks, substances such as trimethylchlorosilane, dimethyldichlorosilane, ethyl alcohol, and isopropyl alcohol are added to the above fine powder, and silicon dioxide fine powder whose surface is made hydrophobic by reacting with silanol groups is used. It is effective to use this hydrophobic fine powder, since it does not become so thixotropic and the amount of adsorbed water is small, the substance itself is excellent in stability and advantageous in operation.

The fine powder used in the present invention may be mainly silicon dioxide fine powder. In addition, it may contain aluminum oxide, magnesium oxide, etc., general fillers, pigments, etc. as impurities or a mixture. There is no problem even if it is done.

The silicon dioxide fine powder used in the present invention is
It means one containing 60% or more as a silicon dioxide component. The fine powder used has an average particle size of 0.1 μm.
It is necessary to be below, and if it is 0.05 μm or less, it is more preferable in terms of effects. If it is larger than 0.1 μm, the pore diameter of the fine pores of the moisture permeable membrane of the obtained coated fabric becomes too large, and the waterproof performance is deteriorated, which is not preferable.

Further, it is necessary that the silicon dioxide fine powder is uniformly contained in the resin layer made of a synthetic polymer mainly composed of polyurethane resin in an amount of 1% or more, and more preferably 3% or more. If it is less than 1%, the number of fine pores in the moisture-permeable film of the moisture-permeable and wind-proof raised fabric will be small, and high moisture permeability will not be obtained.

The polyurethane resin-based synthetic polymer of the present invention means one containing 50 to 100% of a polyurethane component, and other synthetic polymers include, for example, polyacrylic acid, polyvinyl chloride, polystyrene, polybutadiene, It suffices that the polyamino acid or the like or a copolymer thereof is contained in the range of less than 50%, and of course, a compound modified with fluorine or silicon can be used in the present invention.

Polyurethane resin is a copolymer obtained by reacting polyisocyanate and polyol,
As the isocyanate component, aromatic diisocyanate,
Using aliphatic diisocyanates and alicyclic diisocyanates alone or in a mixture thereof, for example, trilene
2,4-diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexane diisocyanate, 1,
4-cyclohexane diisocyanate, etc.,
Polyether polyol and polyester polyol are used as the polyol component, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like are used as the polyether polyol, and diols such as ethylene glycol and propylene glycol and adipic acid and sebacine are used as the polyester polyol. 2 such as acid
A reaction product with a basic acid or a ring-opening polymer such as caprolactone is used.

The above-mentioned polyurethane polymer-based synthetic polymer solution containing silicon dioxide is impregnated or applied by a conventional padding method, coating method, spray method or the like. When the raised surface of the fabric has directionality, it is preferable to impregnate or apply the fabric in the normal direction. If impregnation and coating are performed in the direction of the reverse eye, the fluff will be disturbed and the surface quality will deteriorate.

In order to obtain the desired moisture permeability, windproof property and soft feeling, it depends on the smoothness of the surface of the raised fabric and the air permeability (JIS L-1096 method), but generally it is a resin solid type. Give 1 to 50% in minutes. When the adhered amount is less than 1% in terms of solid content, moisture permeability is obtained, but windbreak performance is poor. On the other hand, if it exceeds 50%, the moisture permeability and the windproof performance are not impaired, but the texture becomes too hard and the characteristics of the napped fabric cannot be exhibited. It is preferable that the amount of solid components attached is 3 to 30%.

As a method of applying the resin, for example, when a coating method is taken as an example, a resin solution containing the above-mentioned polyurethane-based synthetic polymer is applied to the napped cloth, and then 0 to 3 is applied.
The resin component is coagulated (wet coagulation) by immersing it in 0 ° C water for 5-10 minutes, and then in hot water at 40-60 ° C for 5-15 minutes.
After washing for 1 minute, dry as usual.

On the surface of the napped fabric processed by the above-mentioned method, fluff is converged by applying resin, the surface is not smooth, and the texture tends to be hard. In the present invention, in order to obtain not only moisture permeability and windproof performance but also a soft texture, the fabric is subjected to an emery raising treatment for eliminating the defect of fluff focusing by a sand roll, a sand belt, an emery raising machine or the like. .. For example, when processing is performed using an emery raising machine, sandpaper grain size # 150 to # 500
It is good to use the one.

The present invention has the above-mentioned constitution. According to the present invention, there is provided a moisture-permeable and wind-proof raised fabric having excellent moisture permeability and windbreak performance, and also having a soft texture. Obtainable.

[0022]

[Working] Wet coagulation by impregnating or coating a fabric with a synthetic polymer solution composed mainly of polyurethane resin, in which silicon dioxide fine powder having a substantially non-porous and average particle size of 0.1 μm or less is uniformly dispersed. As a result, the polyurethane resin forms its unique porous structure and, at the same time, the silicon dioxide fine powder is uniformly micro-dispersed in the solution.
A slight deviation in the solidification rate occurs at the interface between the silicon dioxide fine powder and the resin to be solidified, and as a result, a large number of fine pores of 1 μm or less are provided that significantly improve the moisture permeability without lowering the windbreak performance. Will be able to.

In the present invention, the moisture permeation performance is improved by the formed fine perforations, so that it is peculiar to the highly moisture permeable fabric.
It is also very effective against water leakage, which tends to cause problems when pressure is applied during wearing. Further, since the silicon dioxide fine powder is uniformly present throughout the surface layer to the lower layer of the resin layer, the resin layer surface eliminates the slimy feeling peculiar to the polyurethane resin, and the texture is obtained by performing a post emery treatment or the like. Becomes softer and higher quality is obtained.

[0024]

EXAMPLES The present invention will be described in more detail below with reference to examples. The measurement and evaluation of the performance of the cloth in the examples were carried out by the following methods. (1) Water vapor transmission rate: JIS L-1099 (method A-1) (2) Air permeability: JIS L-1096 (3) Feeling: Measurement was performed by handling, and the following three-stage evaluation was performed. ○: Soft △: Slightly hard ×: Hard

Example 1 Polyester false twisted bulky yarn 75 denier / 36 as warp
Using a filament (S twist 300 times / m) and a polyester filament yarn 110 denier / 366 filament as a weft, a five-layer satin weave having a double-sided weft double weave structure was woven.
The width immediately after weaving was 175 cm, the warp density was 110 threads / inch, the weft density was 164 threads / inch, and the weight per 1 m ² was 140 g. This woven cloth was used for relaxing, scouring and dyeing in a usual manner, followed by setting with a pin tenter at 170 ° C. for 50 seconds. Next, using the hydraulic type cloth raising machine, the front side was raised 9 times and the back side was lightly raised 3 times. Subsequently, heat setting was performed at 180 ° C. for 40 seconds. The napped fabric at this time has a width of 130 cm,
The thickness was 1.0 mm and the basis weight was 190 g / m ² . A polyurethane resin solution having a solid content of 25% and a composition shown in the following Formulation 1 was applied to this napped woven fabric at a squeezing ratio of 100% using a mangle, and then immediately immersed in water at 15 ° C. for 40 seconds to obtain the resin content. Was solidified, followed by washing in warm water at 50 ° C for 10 minutes and then drying to obtain 11% silicon dioxide fine powder.
The containing resin layer was formed. [Formulation 1] Resamine CU-4550 100 parts (Dainichi Seika Kogyo Co., Ltd., ester type polyurethane resin) N / N-dimethylformamide 200 parts Aerosil R-974 3 parts (Nippon Aerosil Co., Ltd., average particle size 0. 012 μm hydrophobic silicon dioxide fine powder)

Then, using an emery raising machine, the surface of the above fabric is emery raised in the normal direction of the fluff 8 times, and then the back side is subjected to emery raising 2 times in order.
The raised fabric of the present invention was obtained.

For comparison with the present invention, a brushed fabric for comparison (Comparative Example 1) was prepared in the same manner as in this Example except that Aerosil R-974 was omitted from Formulation 1 in this Example.
And ) Got.

The performances of the moisture-permeable and windproof raised fabrics of the present invention and comparative examples were measured and evaluated, and the results are shown in Table 1 together.

[Table 1]

As is clear from the results shown in Table 1, the moisture-permeable and wind-proof raised fabric of the present invention has excellent moisture-permeability and wind-proof property, and has a touch unique to the ultrafine fibers, and is very It was good.

Example 2 A napped fabric before impregnation with the polyurethane resin solution in Example 1 was prepared, and a polyurethane resin solution having a solid content of 25% and a composition shown in the following prescription 2 was added to the knife over roll coater. Was coated on one side of the above-mentioned raised fabric with a coating amount of 80 g / m ² , and immediately 4
The resin component was solidified by immersing for 0 seconds, followed by washing in warm water at 50 ° C. for 10 minutes and drying to form a resin layer containing 11% of silicon dioxide fine powder.

[Formulation 2] Resamine CU-4550 100 parts (Dainichi Seika Kogyo Co., Ltd., ester type polyurethane resin) Resamine X-100 1 part (Dainichi Seika Kogyo Co., isocyanate compound) N · N-dimethyl Formamide 25 parts Aerosil R-974 3 parts (manufactured by Nippon Aerosil Co., Ltd., hydrophobic silicon dioxide fine powder having an average particle size of 0.012 μm) Next, emery nap treatment was performed under the same conditions as in Example 1,
The processed fabric of the present invention was obtained.

For comparison with the present invention, a processed fabric for comparison (Comparative Example 2) was prepared in the same manner as in this Example except that Aerosil R-974 was omitted from Formulation 2 in this Example.
And ) Got.

The performances of the processed fabrics of the present invention and Comparative Example 2 were measured and evaluated, and the results are shown in Table 2 together. (Below margin)

[Table 2]

As is clear from the results shown in Table 2, the processed fabric of the present invention has excellent moisture permeability, and by applying the hydrophobic silicon dioxide fine powder, the drawback of the highly moisture permeable windproof fabric is It can be seen that it is very effective against water leakage and that the texture is soft.

[0035]

According to the method of the present invention, it is possible to obtain a raised fabric having excellent moisture permeability and windproof performance. Furthermore, the moisture-permeable and windproof raised fabric of the present invention has a soft texture and an excellent appearance quality by being further raised after the resin is applied.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D06M 11/79 D06N 3/14 DAD 7141-4F 102 7141-4F // D06M 101: 30

Claims (1)

[Claims] 1. A raised fabric mainly composed of synthetic fibers,
Fabrication of napped fabric characterized by applying a synthetic polymer mainly composed of polyurethane resin containing 1% or more of fine particles of silicon dioxide having an average particle size of 0.1 μm or less, wet coagulating, and then subjecting to an emery nap treatment Method.