KR890005018B1 - Water proofing cloth of moisture transpiration - Google Patents

Abstract

The water-proof fabric having lots of micropores is manufd. by (a) an adhesive layer on a surface of fabrics with the mixing soln. of polyurethane resin, acrylic resin, inorganic substance such as silicagel, foaming agent, polyisocyanate and organic solvent, (b) forming a microporous layer on the adhesive layer with polyurethane resin, inorganic substance, surfactant, waterrepellent agent, polyisocyanate and organic solvent, and (c) forming a surface layer on the microporous layer with polyurethane resin, paraffin wax, inorganic substance, fluoro polymer (I; R1= H, lower alkyl; R2= C2-21 Perfluoro alkyl; n=10-200).

Description

Breathable tarpaulin

1 is an enlarged cross-sectional view showing the configuration of the moisture-permeable tarpaulin of the present invention.

2 is an electron micrograph showing a 300-fold enlarged cross section of a void formed in the polyurethane coating of the moisture-permeable tarpaulin of the present invention.

3 is an electron microscope in which the surface layer of the moisture-permeable tarpaulin of the present invention is enlarged 200 times.

The present invention relates to an improved moisture permeable tarpaulin. More specifically, in the present invention, the adhesive layer, the microporous layer and the surface layer are sequentially formed on one side of the forge, and a plurality of micropores penetrate between the plurality of pores formed in the adhesive layer, and the surface layer has a low surface friction coefficient. It is characterized in that the penetration of the body is prevented.

The moisture-permeable tarpaulin known as Japanese Patent Application Laid-Open No. 51-70082 is formed by forming an adhesive layer and a microporous layer on one side of the forge. When used for a long time, there was a drawback of lowering moisture permeability due to clogging of micropores.

In addition, since the inside of the adhesive layer is composed of only a simple void by foaming of PAU resin (polyamino acid urethane resin), there is a problem that the moisture permeability is insufficient.

The present invention solves the problems as described above, excellent sewnability and can continuously maintain the moisture permeability, to provide a moisture-permeable waterproof cloth to further improve the moisture permeability by the micropores formed in the adhesive layer. The bar will be described in detail below.

The present invention is a polar organic solvent solution containing a polyurethane polymer, an inorganic material, a surfactant, a water-repellent agent by coating an organic solvent solution made of an inorganic material, a repellent agent, a polyurethane resin on a fiber cloth to give a breathable and moisture-permeable adhesive layer Was coated on the adhesive layer and wet-coagulated, followed by extraction of the polar organic solvent and the elution of an inorganic substance in an alkaline aqueous solution, followed by drying to form a normal microporous layer. The present invention relates to a water-permeable waterproof foam which is applied to a water-repellent treatment by applying a certain amount of an organic solvent solution made of oil-repellent agent to provide excellent sewing and oil repellency at the same time.

The present invention will be described in detail by coating layer as follows.

(Adhesive layer)

It is manufactured as follows as a layer giving excellent adhesion between the fabric and the microporous coating with moisture permeability. 10-20% of polyester polyurethane resin and other solid content of number average molecular weight 10,000 to 50,000, (hereinafter is weight percentage), solid content of acrylic resin 1-9%, inorganic material 3-10%, foaming agent 1-4%, poly A solution of 0.2-5% isocyanate compound and an organic solvent is coated on a fiber cloth and then dried or dried to elute an inorganic substance in an alkaline aqueous solution and then dried.

Polyurethane resin is too strong adhesion when the number average molecular weight is 50,000 or more is difficult to dissolve inorganic substances in the alkaline aqueous solution and low moisture permeability, when the 10,000 or more is too weak adhesiveness.

As inorganic materials, silica gel, titanium dioxide, calcium carbonate, sodium bicarbonate and calcium chloride were used. If less than 3%, air permeability and moisture permeability are insufficient. If it is 10% or more, the viscosity decreases, and the adhesiveness and workability deteriorate.

(Microporous layer)

2 is a layer for forming voids and micropores as shown in the photograph.

The solid content of the polyurethane polymer is 8-30% (hereafter weight percentage), 0.1-10% inorganic material, 0.1-5% nonionic surfactant, 0.1-5% anionic surfactant, 0.2-5% water repellent, Then, polar organic solvent solution containing 0.2-5% of polyisocyanate was coated on the fiber cloth and wet-coagulated in 3-15%, DMF aqueous solution to form micropores, and then polar organic solvent was extracted from alkaline aqueous solution and inorganic substance. After eluting it, it is dried and water-repellent.

(Surface layer)

It is a layer for improving seizure defects due to ease of penetration into the inside of the microporous layer which is a disadvantage of the conventional moisture-permeable waterproof material, wet touch, and high coefficient of friction of the polyurethane surface. Polyurethane solids having a hardness of 80 degrees or more are 5-15% (hereinafter referred to as a weight percentage), silica gel 1-8%, paraffin wax 1-8%, and fluoropolymer 1-10% of the following general formula (1): 5-20% aluminum powder or an organic solvent solution of a suitable amount of pigment is coated or dried on the microporous layer by spraying or printing to make the surface layer 0.5-10μ thick and then treated with a silicone or fluorine-based water repellent agent. do.

When the hardness of the polyurethane resin is 80 degrees or less, the surface feel is sticky and moisture permeability is lowered. In addition, when the polyurethane solid content is 5% or less, the effect is small, and when it is 15% or more, workability is poor and thickness control is difficult.

If the silica gel is less than 1%, the moisture permeability is lowered, the surface gloss is severe, and if it is more than 8%, workability is poor. If the paraffin wax is less than 1%, the coefficient of friction is high and there is no effect. If the paraffin wax is more than 8%, the moisture permeability is lowered and the surface is not smooth. If the fluorine-based oil and water repellent agent of the following general formula (1) is less than 1%, its effect is insufficient, and if it is more than 10%, the coating state is uneven.

(Wherein R ₁ is hydrogen or lower alkyl group, R ₂ is a perfluoro alkyl group having ₂ to ₂₁ carbon atoms, n is an integer of 100-200.) Aluminum powder is used to improve the thermal insulation by radiant heat reflection. If it is added less than 5%, the effect is insufficient, and if it is more than 20%, the aluminum powder is highly contaminated by the powder and the value of the product is lost.

In addition, when the surface layer thickness is 0.5μ or less, the effect is insufficient, and when it is 10μ or more, the moisture permeability is lowered and the touch is bad.

Examples of the material used in the present invention include knitted fabrics made of natural fibers such as cotton, silk, wool, chemical fibers such as viscose rayon, synthetic fibers such as polyamide, polyester, and polyacrylonitrile, fabrics, or blended fabrics thereof. In the case of short fibers, fine hairs are used to relieve or reduce hairs by processing such as calendering.

The moisture-permeable blister of the present invention is excellent in sewing work because the surface of the surface layer has a plurality of fine uneven surface and the surface friction coefficient is small, as shown in the surface photograph of FIG. In addition, since the surface layer is treated with an oil repellent agent in the present invention, the body is prevented from adhering to the surface layer or penetrated into the micropores during use, and thus there is no closed end that the moisture permeability decreases even when used for a long time. In addition, the present invention further enhances the moisture permeability of the microporous layer due to the micropores penetrating between the pores and the pores formed in the adhesive layer, so that the moisture-permeable waterproof fabric of the present invention has improved moisture permeability compared to having only simple pores in the adhesive layer.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

A 70d nylon fabric (inclination density 120ol / inch, weft density 90ol / inch) was immersed in an aqueous solution of 5% concentration of fluorine-based water repellent and heat-treated at 170 ° C.

Composition of A Resin Liquid

Polyurethane Resin: 15 parts

Acrylic resin: 5 parts

Na ₂ B ₄ O ₇ 10 H ₂ O: 4 parts

Silica gel: 3 parts

NaHCO ₃ : 2 parts

Toluene: 67 parts

Apply 50g / m ² and dry to form a breathable and moisture-permeable adhesive layer, and then apply 250g / m ^{2 of} vertical solution B using a knife over-roll coater and place it in a coagulation bath kept at 5 ° C. M. F. solution at 20 ° C. After immersion for 5 minutes, the solution was again extracted for 20 minutes in an extraction tank maintained at 60 ° C. in 0.5% aqueous sodium hydroxide solution, washed with sodium hydroxide and dried at 150 ° C. for 2 minutes to form a microporous layer.

B resin composition

Polyester Crab Polyurethane: 16 parts

D.M.F: 63 copies

Silica gel: 7 parts

HO (EO) ₁₀ (PO) ₃₀ (EO) ₁₀ H: 4 parts

Fluorine-based water repellent: 4 parts

Polypropylene Sulfate: 2 parts

2.4- (2.6) torylene diisocyanate: 4 parts

A vertical solution C is applied on the microporous layer by a spray method so that the thickness after drying is maintained at 3 mu to obtain a water-permeable waterproof material by water repellent treatment.

C resin solution composition

Polyurethane (100 degree of hardness): 10 parts

Silica gel: 2 parts

Paraffin Wax: Part 2

MEK: 84 parts

Comparative Example 1

Urethane resin was spot-coated on 70d nylon fabric (inclination density 120ol / inch, weft density 90ol / inch), and resin D was coated on one side with knife over roll coater.

D resin liquid composition

Polyurethane Resin: 15 parts

D.M.F: 83 copies

Nonionic Surfactants: 2 parts

200 g / m ^{2 was} applied and 5% D.M.F aqueous solution was immersed in a molten bath maintained at 20 ° C. for 5 minutes, extracted for 20 minutes in an extraction tank maintained at 60 ° C., dried at 150 ° C. for 2 minutes, and subjected to water repellent treatment.

The results of measuring the physical properties of the sample prepared by Example 1 in comparison with Example 1 are shown in Table 1.

Table 1

(*; Measured by Model SS-505D of TOYO BALDWIN CO., LTD (JAPAN))

As described above, the moisture-permeable waterproof fabric of the present invention is not only excellent in waterproofness and moisture permeability but also sewability. It has been confirmed that it can be effectively used in various sports clothes, winter clothes, waterproof clothes, footwear, etc. because of its peel strength and oil repellency.

Claims (3)

Applying a solution of polyurethane resin, acrylic resin, inorganic material, foaming agent, polyisocyanate and organic solvent on one side of the forge and drying it to form an adhesive layer, and polyurethane resin, inorganic material, bione and anion on the top of the adhesive layer A conventional microporous layer is formed by coating and drying a solution of a surfactant, a water repellent, a polyisocyanate, and a polar organic solvent, and a polyurethane resin, paraffin wax, an inorganic material, a fluorine-based polymer, and an organic solvent on the upper surface of the microporous layer. The moisture-permeable waterproof cloth which formed the surface layer by apply | coating and drying a solution of this. The moisture-permeable waterproof fabric of claim 1, wherein the inorganic material is silica gel. The moisture-permeable waterproof fabric according to claim 1, wherein the fluoropolymer is a compound of the following general formula.

R ₁ is hydrogen or a lower alkyl group, R ₂ is a C2-21 perfluoroalkyl group (Perflouoro alkvl), n is an integer of 10-200.

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