JPS63175177A - Production of moisture permeable waterproof fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a moisture permeable waterproof fabric having excellent waterproof properties.

(Prior art) A resin solution consisting of a polyurethane resin, an isocyanate compound, and a polar organic solvent is applied to a fiber fabric.

Immerse in water to solidify the resin. A method for producing a moisture-permeable waterproof fabric using the so-called wet coagulation method.

It has been known for a long time.

The moisture permeable waterproof fabric manufactured by such a wet coagulation method has a moisture permeability of 4500 to 5000 g/I・24hrs.
(JIS Z-0208), water pressure resistance 13
00~1500 Dragon H! 0 (JIS L-1096 low water pressure method), and was considered to be fully satisfactory in terms of performance.However, in recent years, there has been an increasing demand for a dramatic improvement in waterproof performance, and it has become difficult to achieve the same level of moisture permeability. In order to meet these demands, products with even higher water pressure resistance are required.

Conventional methods such as those mentioned above can no longer be used (
became.

(Problem to be solved by the invention) The present invention was made in view of the above-mentioned current situation.

In particular, the object is to obtain a highly moisture-permeable waterproof fabric with good waterproof performance.

(Means for Solving the Problems) The present invention achieves the above-mentioned object and has a first-order configuration.

That is, the present invention is based on the following two aspects: ``After applying a resin solution consisting of a polyurethane resin, an isocyanate compound, a polar organic solvent, and a volatile solvent to a fiber fabric.

A method for producing a moisture-permeable waterproof fabric characterized by immersing the fabric in a solvent for 20 to 30 minutes to coagulate the resin component.''

Two aspects of the present invention will be described in detail below.

In the present invention, a resin solution consisting of a polyurethane resin, an isocyanate compound, a polar organic solvent, and a volatile solvent is used to form a film, and this is applied to a fiber fabric.

The polyurethane resin used in the present invention is a polymer obtained by reacting polyisocyanate and polyol,
As the polyisocyanate, known aliphatic and aromatic polyisocyanates can be used, such as hexamethylene diisocyanate, toluene diisocyanate, xylene diisocyanate, and the reaction product of an excess of these with a polyhydric alcohol. As the polyol, it is possible to use polyethers, polyesters, and other known polyols that are commonly used in the production of polyurethane resins. Examples of polyesters include reactants of polyhydric alcohols such as ethylene glycol, diethylene glycol or 1,4-butanediol, and polybasic carboxylic acids such as oxalic acid or sebacic acid.

Examples of polyethers include ethylene glycol,
Examples include polyhydric alcohols such as propylene glycol to which one or more alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide are added.

In the present invention, a compound having high affinity with the fiber base fabric is used in combination with the resin solution for the purpose of improving the peeling resistance between the resin film and the fabric. In the present invention, an isocyanate compound is also used as the compound. As an isocyanate compound, 2
・Triisocyanate obtained by addition reaction between 4-tolylene diisocyanate diphenylmethane diisocyanate, isophorone diisocyanate hexamethylene isocyanate, or 3 moles of these diisocyanates and 1 mole of a compound containing active hydrogen (e.g., trimethylolpropane, glycerin, etc.) class is used.

The above-mentioned isocyanates can be stabilized by adding phenol, methyl ethyl ketoxime, etc., even if the isocyanate group is in a free form.
Even if the block is dissociated by subsequent heat treatment, any one can be used, and it may be used appropriately depending on workability, purpose, etc. The amount of isocyanate compound used is 0.1 to 10% based on the polyurethane resin.
.

It is desirable to use it preferably in a proportion of 0.5 to 5%. If the amount used is less than 0.1%, the adhesive strength of the resin to the fabric will be poor, and if it exceeds 10%, the texture will be hardened, which is not preferable.

In the present invention, the above-mentioned polyurethane resin and isocyanate compound are mixed with a polar organic solvent and a volatile solvent. Volume E4 includes dimethylformamide toamide, dimethyl sulfoxide, N-methylpyrrolidone, hexamethylenephosphonamide, etc. Volatile solvents include ketone solvents, aromatic hydrocarbon solvents, alcohols, etc. Examples of ketone solvents include acetone, methyl ethyl ketone, methyl isobutyl ketone, etc., and aromatic hydrocarbon solvents include toluene,
Alcohols include xylene, etc.

Examples include ethyl alcohol, propyl alcohol, and isopropyl alcohol.

The resin solution may be applied to the fiber fabric by a conventional coating method, such as a coating method using a knife coater, a comma coater, or the like. Generally, the appropriate coating thickness is about 10 to 150 μm in view of machine performance.

The fiber fabric used here is: Polyamide synthetic fibers represented by nylon 6 and nylon 66.

Polyester synthetic fibers represented by polyethylene terephthalate, polyacrylonitrile synthetic fibers, and polyvinyl alcohol synthetic fibers. Fabrics made of semi-synthetic fibers such as triacetate, or blended fibers such as nylon 6/cotton, polyethylene terephthalate/cotton, etc.
Examples include kW products and non-woven fabrics.

In the present invention, these fiber fabrics may be treated with a water repellent in advance. In this case, the water resistance of the fabric is
Water repellency 90 by JIS L-1096 spray method
It is desirable that there be at least one. The fθ water agent to be used may be a known one such as a paraffin-based ↑8 water agent, a polysiloxane-based water repellent, or a fluorine-based water repellent, and the treatment may be performed by a commonly used known method. . When particularly good water repellency is required, a fluorine-based water repellent is used. 35%) followed by heat treatment at 160° C. for 1 minute.

In the present invention, after applying the aforementioned resin solution to the fiber fabric,
The used solvent is uniformly distributed to 20~b. Evaporation of solvent is 2
If it is less than 0%, sufficient waterproofness cannot be obtained, and if it is less than 70%
If it exceeds this, the concentration of the coated resin will become too high, making it difficult for the solvent to dissolve into water, and the moisture permeability of the resulting coating film will drop significantly.

Evaporation of the solvent is required to be between 20 and 70%. It is desirable that the evaporation be carried out at a temperature below the boiling point of the volatile solvent used, preferably below 20°C. When the solvent is evaporated in such a manner, the thickness of the applied resin layer decreases in inverse proportion to the evaporation rate of the solvent.

The fabric that has been soaked with 20~b of solvent is immersed in water to coagulate the resin. The water temperature at this time may be room temperature, and the immersion time is preferably 20 seconds or more; if it is less than 20 seconds, the resin will not solidify sufficiently, making it difficult to obtain a satisfactory resin coating.

After coagulating the resin in water, add 50% of the fabric as needed.
Wash with warm water of 0 to 80°C to remove remaining solvent. The conditions for hot water washing at this time vary depending on the mixing ratio of the resin and solvent used, but usually at a temperature of 30 to 80°C.
You can do this for more than a minute.

After washing with hot water, dry and apply water repellent treatment if necessary.

Regarding the water repellent used here and the water repellent treatment method,
As mentioned above, the water repellent treatment may be carried out by an appropriate padding method, spray method, coating method, etc. in accordance with the method used when the fiber fabric is previously treated to be water repellent. Also, to increase the durability of water repellency.

Water repellent treatment can also be performed using a resin such as melamine resin.

In the method of the present invention, it is also possible to perform the TA water treatment both before and after the coating process, and in this case, a product with even better water pressure resistance can be obtained. Also,
In order to improve the smoothness and flexibility of the fabric, the fabric may be further coated with a polysiloxane resin. As a polysiloxane to be applied.

Dimethylpolysiloxane, phenyl group-containing polysiloxane, modified silicone oils such as amino-modified and olefin-modified, and methylhydrogen polysiloxane.

Alternatively, a mixture of dimethylpolysiloxane and methylhydrogen polysiloxane can be used, which may be selected as appropriate depending on the intended use. In the present invention, dimethylpolysiloxane having a molecular weight of 5,000 to 30,000 is preferably used. First of all, this polysiloxane treatment can impart smoothness to the fabric and reduce frictional damage to the film due to friction between the fabrics. Also, due to this smoothing effect,
It also has the advantage of being able to be put on and taken off smoothly without using a lining. Second, the silicone resin adheres between the textile structures,
By reducing the friction between the threads that make up the fabric, the texture becomes softer. This polysiloxane treatment may be applied in the form of an aqueous dispersion, an emulsion, etc., but in order to prevent treatment spots from occurring, chlorinated hydrocarbons such as 1,1,1-trichloroethane, trichlorethylene, perchlorethylene, etc. It may also be applied as a solution in a solvent such as toluene, hexane or mineral turpentine. The polysiloxane resin may be applied by one of the commonly used padding methods, coating methods, spraying methods, etc. What is the amount of polysiloxane attached?

The solid content is preferably 0.1% or more based on the fiber weight.

The present invention has three or more configurations.

(Function) The method of the present invention has a structure in which a resin solution consisting of a polyurethane resin, an isocyanate compound, a polar organic solvent, and a volatile solvent is applied to a fiber fabric, and then the solvent is applied to the fiber fabric to solidify the resin component. be.

In this way, when immersing in water, if you roll 20 to 100ml of solvent in advance and then immerse, the solvent will be extracted in a fine form and voids will be formed during immersion in water, so the pores formed will be extremely small. It becomes countless microscopic pores. This contributes to improved water pressure resistance.

(Example) Next, the present invention will be described in more detail with reference to Examples. Two examples are the measurement of the performance of the fabric.

Evaluation was performed by the first method.

(1) Water pressure resistance JIS L-1096 (low water pressure method) (2) Moisture permeability JIS Z-0208 (3) Peeling resistance Using a Gakushin type friction fastness tester, 10 at a load of 200g
The fabric was rubbed 00 times, the appearance of the fabric was observed, and the following two-level evaluation was performed.

○・-1111~・No peeling at all x −−−−−−・Example 1 where peeling is observed First, as a base fabric, the warp is nylon 70 denier/24 filament, and the weft is nylon 70 denier/34 Warp density 120/inch using filament, weft density 9
A plain woven fabric (taffeta) of 0 strands/inch is prepared, and after scouring and dyeing with an acid dye in the usual manner, it is heated at a temperature of 170 using a calendering machine with mirror rolls.
Calendering was performed under the conditions of °C, pressure of 3Q kg/cm, and speed of 20 m/min.

Next, a polyurethane resin solution with a resin solid content concentration of 20% shown in Formulation 1 below was applied at a coating amount of 50 g/rd using a knife-over roll coater, and then hot air treatment was performed at 40°C for 3 minutes. The solvent used was uniformly reduced to 45%.
The resin was evaporated, then immersed in a 20°C water bath for 2 minutes to solidify the resin, washed in warm water at 60°C for 10 minutes, and dried.

[Formulation 1] Dimethylformamide 5 parts Methyl ethyl ketone 20 parts After this, the above fabric was padded with a 5% aqueous solution of Asahi Guard 710 (a product of Asahi Glass Co., Ltd.), a fluorine-based water agent emulsion (squeezing ratio 30).
%), heat treated at 160°C for 1 minute, and then padded with a 4% mineral turpentine solution of Shin-Etsu silicone oil KF-96 (dimethyl polysiloxane, product of Shin-Etsu Chemical Co., Ltd.) (squeezing ratio 30%). After drying, heat treatment was performed at 130° C. for 3 minutes in a tenter to obtain two moisture-permeable waterproof fabrics of the present invention.

For comparison with the present invention, evaporation of the solvent immediately after application of the resin liquid of Formulation 1 in this example was reduced.

A comparative moisture-permeable waterproof fabric was obtained in exactly the same manner as in this example.

The performance of the present invention and comparative moisture-permeable waterproof fabrics obtained as described above was measured and evaluated.

The results are shown in Table 1.

As is clear from Table 1, the moisture permeable waterproof fabric according to the present invention exhibited excellent water pressure resistance and good moisture permeability. It also had excellent peeling resistance.

(Effects of the Invention) In the present invention, after coating a fabric with a resin liquid using a mixture of a polar organic solvent and a volatile solvent as a solvent for polyurethane resin, film formation is performed using a solid method to remove the solvent from 20 to 50%. According to the present invention having such a configuration, it is possible to produce a highly moisture permeable waterproof fabric having excellent water pressure resistance.

In addition, in order to improve the waterproofness of sensitive materials with surface shapes such as spun fabrics, conventionally only a multiple coating method was possible, but even for such materials, according to the method of the present invention, - It is very rational because it is possible to produce a moisture-permeable waterproof fabric with high water pressure resistance by coating with .

The moisture permeable waterproof fabric of the present invention is a material particularly suitable for sports clothing due to its excellent performance.

Claims (1)

[Claims] (1) After applying a resin solution consisting of a polyurethane resin, an isocyanate compound, a polar organic solvent, and a volatile solvent to a fiber fabric, 20 to 70% of the solvent is evaporated, and then immersed in water to solidify the resin component. A method for producing a moisture-permeable waterproof fabric.