KR100286604B1 - Dry porous type moisture permeance waterproof cloth and manufacturing method thereof - Google Patents

Abstract

PURPOSE: Dry porous type moisture permeance waterproof cloth having excellent moisture transpiration and high water-pressure resistance, and a manufacturing method thereof are provided which is characterized by using organic solvent dispersing type water repellent to produce w/o type emulsion polyurethane resin coating solution and dispersing water repellent on the whole of polyurethane film equally to give hydrophobicity. CONSTITUTION: The dry porous type moisture permeance waterproof cloth is obtained by coating cloth with the w/o type emulsion polyurethane resin coating solution. The polyurethane resin coating solution is comprised of 100pts.wt. of polyurethane type resin, 20-50pts.wt. of organic solvent, 1-5pts.wt. of hardening agent, 1-5pts.wt. of the organic solvent dispersing type water repellent and 31-70pts.wt. of a mixture containing water and methyl ethyl ketone. The organic solvent is comprised of 10-30pts.wt. of methyl ethyl ketone and 10-20pts.wt. of toluene based on 100pts.wt. of polyurethane type resin. The dry porous type moisture permeance waterproof cloth is characterized by at least 3000mm H2O of water-pressure resistance and at least 5000g/m¬2·24hours of moisture transpiration.

Description

Dry porous permeable tarpaulin and its manufacturing method

The present invention is to provide a dry porous permeable waterproof tarpaulin having a high moisture permeability and at the same time high water resistance properties while solving the problems of the prior art described above and a method of manufacturing the same.

I. Composition and Function of the Invention

The present invention relates to a dry porous vapor permeable tarpaulin having a high moisture permeability and at the same time a high water pressure resistance, and a manufacturing method thereof.

More specifically, the present invention is coated with a water-in-oil dispersion (w / o) emulsion polyurethane resin coating liquid containing an organic solvent-dispersed water-repellent agent so that the water pressure (measured by JIS-L 1096 method) is 3,000 mm H ₂ O or more, The moisture permeability (measured by JIS-L 1099 method) relates to a dry porous permeable tarpaulin having 5,000 g / m 2 · 24 hours or more.

In addition, the present invention is a water-repellent agent in the manufacture of a dry porous moisture-proof tarpaulin by coating the fiber cloth with a water-in-water (w / o) emulsion polyurethane resin coating liquid containing essentially polyurethane-based resins, organic solvents, curing agents and water-repellent agent It relates to a method for producing a dry porous moisture permeable tarpaulin, characterized in that the organic solvent dispersed water repellent is used as.

The present invention will be described in more detail.

First, the composition of the water-in-oil (w / o) emulsion polyurethane resin coating liquid coated on the fiber cloth is shown in the following composition (II).

-Composition Ⅱ-

100 parts by weight of polyurethane resin

20-50 parts by weight of organic solvent (methyl ethyl ketone / toluene) (10-30 parts by weight)

/ 10 ~ 20 parts by weight)

1 to 5 parts by weight of curing agent (hexamethylene diisocyanate)

1 ~ 5 parts by weight of organic solvent dispersion type water repellent

(In organic solvents polorocarbon solids

20-40 wt% dispersion)

Water / methyl ethyl ketone solution 31 ~ 70 parts by weight (30 ~ 60 parts by weight

/ 1 to 10 parts by weight)

In the composition II, as the organic solvent dispersion type water repellent, a water repellent in which 30 to 40% by weight of fluorocarbon (FC) is dispersed in an organic solvent such as toluene, methyl ethyl ketone or dimethyl formamide (DMF) is used. It is preferable that the specific gravity of the organic solvent-dispersed water repellent is about 1, and it becomes difficult to form a w / o emulsion when the solid content of fluorocarbon (FC) exceeds 40% by weight.

It is preferable to use a polyether type polyurethane resin as a polyurethane resin.

As the organic solvent, a solvent in which 10-30 parts by weight of methyl ethyl ketone and 10-20 parts by weight of toluene are mixed with respect to 100 parts by weight of polyurethane resin is used, and hexamethylene diisocyanate is used as a curing agent.

As the fiber wrapping, polyester, polyamide or mixed sump these can be used. The dry porous moisture-permeable tarpaulin of the present invention is prepared by coating the w / o emulsion polyurethane coating composition of composition II on a fiber cloth with a knife overall roll thickness of about 20 to 40 μm and then drying it in multiple stages.

In general, the multistage drying condition is one step of drying at 80 ° C. for 30 seconds to 1 minute, followed by two steps of drying at 120 ° C. for 30 seconds to 1 minute, and three steps of drying at 150 ° C. for 30 seconds to 1 minute. In the present invention, the multistage drying conditions are not particularly limited.

The dry porous moisture permeable tarpaulin of the present invention prepared as described above has characteristics of high moisture permeability and high moisture resistance at the same time.

The reason for this is that the water-repellent agent in the w / o emulsion polyurethane coating composition of composition (II) forms a continuous phase of the emulsion together with the polyurethane resin, the organic solvent and the curing agent as shown in FIG. Even after vaporization, it is distributed evenly throughout the polyurethane film.

As a result, the water pressure is remarkably improved compared to the dry porous vapor permeable tarp prepared by using a water-dispersible waterproof that is dissolved in water and exists only around the pores. In addition, looking at the moisture permeability side, the moisture permeation mechanism is determined by the micropores formed in the coating layer, so even if the polyurethane film layer is hydrophobized, the moisture permeability decrease does not occur.

The moisture permeability of the dry porous permeable waterproof fabric prepared by the method of the present invention is 5,000 g / m 2 · 24 hours or more, and the water pressure is 3,000 mm H ₂ O or more.

The measurement method of moisture permeability and water pressure is as follows.

° Waterproof pressure: measured by JIS-L 1096 method

° Water vapor transmission rate: Measured by JIS-L 1099 method

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the examples.

Example 1

The k / over emulsion polyurethane resin coating composition of composition III below was coated on a polyamide pouch with a thickness of 30 μm, and then 80 ° C. × 30 seconds, 120 ° C. × 30 seconds, and 150 ° C. × 30 seconds in a heat treatment chamber. Multistage drying to prepare a dry porous permeable tarp. Table 1 shows the results of measuring the water pressure and water vapor permeability of the prepared porous porous moisture-proof waterproof fabric.

-Composition Ⅲ-

100 parts by weight of polyurethane resin

Organic solvent (methyl ethyl ketone / toluene) 15 parts by weight / 18 parts by weight

1 part by weight of curing agent (hexamethylene diisocyanate)

Organic solvent-dispersed water repellent (2 parts by weight in dimethylformamide

30% by weight of poloocarbon)

40 parts by weight of water / methyl ethyl ketone solution / 5 parts by weight

Example 2

In the composition III, except that the content of the water repellent is changed to 4 parts by weight to prepare a dry porous moisture-proof waterproof fabric under the same conditions as in Example 1.

Table 1 shows the results of measuring the water pressure and water vapor permeability of the prepared porous porous moisture-proof waterproof fabric.

Example 3

In the composition III, a dry porous moisture permeable tarpaulin was manufactured under the same conditions as in Example 1 except that the organic solvent-dispersed water-repellent agent was changed to 30 wt% of carbon solids dispersed in methyl ethyl ketone.

Table 1 shows the results of measuring the water pressure and water vapor permeability of the manufactured porous porous moisture-proof waterproof fabric.

Comparative Example 1

In the composition III, a dry porous permeable waterproof foam was prepared under the same conditions as in Example 1 except that 4 parts by weight of a water-dispersible water repellent (30% by weight of fluorocarbon solids) was used instead of the organic solvent-dispersible water repellent. .

Table 1 shows the results of measuring the water pressure and water vapor permeability of the prepared porous porous moisture-proof waterproof fabric.

TABLE 1

All. Effects of the Invention

The present invention can be dispersed evenly throughout the polyurethane film to hydrophobize the entire film by using an organic solvent dispersion type water repellent in the production of w / o emulsion polyurethane resin coating liquid. As a result, the dry vapor permeable tarpaulin of the present invention has high moisture permeability and high water resistance.

1 is a state diagram of a conventional water dispersion (w / o) type emulsion polyurethane resin coating liquid in water

2 is a state diagram of the water dispersion (w / o) type emulsion polyurethane resin coating liquid in the present invention.

<Explanation of symbols for main parts of drawing>

1: Water + Water Dispersible Water Repellent 2: Polyurethane Resin + Additive + Organic Solvent

3: water 4: polyurethane resin + organic solvent + additive + organic solvent dispersion type water repellent

end. Purpose of the Invention

(1) the technical field to which the invention belongs and the prior art in that field

The present invention relates to a dry porous moisture permeable tarp excellent in water pressure and moisture permeability and a method of manufacturing the same. Dry porous permeable waterproof fabric is used as a garment fabric to be worn during intense exercise under relatively harsh weather conditions such as sports wear, mountaineering clothes and ski wear.

Therefore, the dry porous breathable waterproof fabric not only blocks raindrops during rainfall, but also maintains body temperature in clothes in low temperature environments, and maintains the temperature in clothes by releasing sweat from the body in high temperature environments following intense exercise. As a result, high water pressure and high moisture permeability, which can always express a comfortable fit, are required.

As a conventional technique for producing such a dry porous moisture-permeable tarpaulin, water-in-oil type emulsion (hereinafter referred to as w / o type) emulsion polyurethane containing polyester, polyamide or water-dispersing water repellent agent as shown below The resin coating solution was coated in a knife over roll method, and then dried in multiple stages to prepare a dry porous permeable tarp.

At this time, the composition of the w / o type emulsion polyurethane resin coating liquid is as shown in Composition I below.

-Composition Ⅰ-

100 parts by weight of polyurethane resin

20-50 parts by weight of organic solvent (methyl ethyl ketone / toluene) (10-30 parts by weight)

/ 10 ~ 20 parts by weight)

1 to 5 parts by weight of curing agent (hexamethylene diisocyanate)

Water dispersion type water repellent (1-5 parts by weight of pullooro carbon solids)

30 wt%)

Water / methyl ethyl ketone solution 31 ~ 70 parts by weight (30 ~ 60 parts by weight

/ 1 to 10 parts by weight)

In the prior art, the coating thickness of the coating solution is 20 to 40㎛, after the multi-stage drying conditions, the coating is dried in one stage at 80 ° C for 30 seconds to 1 minute, and dried at 120 ° C for 30 seconds to 1 minute in two stages of 150 Three stages of drying for 30 seconds to 1 minute at ℃ ℃ to prepare a dry porous breathable tarpaulin.

In the prior art, since a water-dispersible water repellent is used for the purpose of improving the water pressure of the dry porous permeable waterproof tarp, the water repellent is coexisted with water particles dispersed in oil in a w / o type emulsion as shown in FIG. Therefore, when the organic solvent is first vaporized in the drying process after coating and water is continuously evaporated in the state of water, the water repellent is concentrated around the fine pores. As a result, the water repellent is not evenly dispersed in the relatively high density polyurethane film, it is difficult to hydrophobize the entire film. For this reason, the water pressure of the dry porous permeable tarp manufactured by the prior art is only 1,500 ~ 2500 m H ₂ O level.

However, in recent years, as the demand for a moisture-permeable tarpaulin having high moisture permeability and high water resistance increases, there is a demand for developing a new technology that can solve the problems of the prior art.

Claims (8)

In manufacturing a dry porous moisture-permeable tarpaulin by coating a fiber cloth with an aqueous dispersion of water (w / o) in an emulsion polyurethane resin coating liquid, a method for producing a dry porous moisture-permeable tarpaulin, characterized in that an organic solvent-dispersible water repellent is used. . The polyurethane resin coating liquid according to claim 1, wherein the polyurethane resin coating liquid comprises 100 parts by weight of a polyurethane-based resin, 20 to 50 parts by weight of an organic solvent, 1 to 5 parts by weight of a curing agent, 1 to 5 parts by weight of an organic solvent dispersion type water repellent, and water and methyl ethyl ketone. Method for producing a dry porous permeable tarpaulin, characterized in that consisting of 31 to 70 parts by weight of the mixture. The method for producing a dry porous permeable tarpaulin according to claim 1, wherein the polyurethane resin is a polyether type polyurethane resin. The method of claim 1, wherein the organic solvent comprises 10 to 30 parts by weight of methyl ethyl ketone and 10 to 20 parts by weight of toluene based on 100 parts by weight of the polyurethane-based resin. The method for producing a dry porous permeable tarpaulin according to claim 2, wherein the curing agent is hexamethylene diisocyanate. The method of claim 2, wherein the organic solvent-dispersed water repellent agent is 20-40% by weight of fluorocarbon (FC) dispersed in the organic solvent. The method for producing a dry porous permeable tarpaulin according to claim 6, wherein the organic solvent is dimethylformamide, toluene or methyl ethyl ketone. Polyurethane coating resin is water-in-oil type polyether type polyurethane resin containing organic solvent dispersion type water repellent, water resistance (measured by JIS-L 1096 method) is 3,000 mm H ₂ O or more, moisture permeability (JIS-L 1099 Dry porous permeable tarp with a measurement of 5,000 g / m 2 · 24 hours or more.

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