KR900002273B1 - Method for manufacturing fabric of moisture permeability and water proot having superior thermal preservation and durability - Google Patents

Abstract

A moisture permeable and water proof fabric which has good glossy surface, improved insulation and durability, ruboff resistance, pin hole free property, storage stability and processability, is prepd. by coating the mixt. of aq. poly urethane resin and ceramic pigment, silica thickner, fine powder of aluminium and surfactant type dispersant. The resistance to water pressure, water permeability and heat insulation rate of the fabric is 2000mm H2O, 400g/m2 day and higher than 60%, resp.

Description

Manufacturing method of moisture-permeable waterproof cloth excellent in heat retention and durability

The present invention relates to a method for manufacturing a coated fabric in which excellent heat retention is imparted by adding a ceramic powder having good thermal reflectivity to a resin composition as an improvement of a conventional water-permeable waterproof processing method.

Among the conventional methods for manufacturing a moisture-permeable waterproof foam is a coating solution in which a polyurethane elastomer (Polyurethane Elastomer) excellent in strength, elasticity, and flexibility is dissolved in a polar organic solvent is applied to a woven fabric, and then immersed in water to coat the coating film It is a method of forming micropores in a film by coagulating and eluting a hydrophilic solvent through washing with water.

At this time, the formed micropores are larger than water vapor and smaller than water droplets so that moisture permeability and water resistance are simultaneously provided.

However, the moisture-resistant waterproof foam lacks the ability to block heat loss, so the use of cold weather is limited, and all-weather outwear is not enough.

In particular, in light of the recent trends in the weight reduction of sports and casual clothing, it is necessary to develop materials with excellent thermal insulation.

As such a heat insulating material, a material coated with a metal powder or paste having good heat reflectivity to a wet coating composition has been developed. This is very effective in blocking the radiant heat by reflecting the radiant heat emitted from the human body by the unique luster of the metal, but since the metal itself is thermally conductive, it does not prevent heat loss due to conduction and the cold feeling by the metallic luster. Note has a disadvantage.

Therefore, recently, a heat-insulating material to which pearl pigment (Pearl Luster Pigment) is added, which is a kind of inorganic ceramic pigment, has been developed and has been greatly received. Pearl pigments, unlike ordinary inorganic pigments, have a gloss but are lower than metal powder, so the amount of additives must be increased in order to give sufficient warmth, so that the pigments can be rubbed after processing and pinholes are generated and washed. There is a problem such as the leakage of the pigment and the storage property that the pigment is partially agglomerated to precipitate when the composition is stored for a long time.

The present invention solves the above problems by using a special additive such as silica (Silica) and aluminum oxide (Aluminum Oxide) fine particles and a high fatty acid salt in a wet coating composition, and relates to a method for thermal insulation coating to improve the insulation, workability and durability will be.

Hereinafter, the present invention will be described in detail.

Bubbles that can be used in the present invention is a nylon fiber, such as nylon 6, nylon 66, polyamide (polyamide) synthetic fibers, polyethylene terephthalate (polyester terephthlalate) represented by a long fiber fabrics such as polyester (synthetic fiber) and cotton, rayon Both short fiber fabrics such as rayon and blended fabrics such as cotton / polyester and rayon / polyester are possible.

Polyurethane resin is a wet coating in which commercial polyester or polyether type diol, TDI (Toluenediisocyanate), MDI (diphenylmethanediisocyanate) and the like are commercially available polyurethane one-component resins made of diisocyanate compounds. Solid resin 20-30%, and the viscosity 100.000-250.000cps (25 degreeC) were used.

Pearl pigment is a mixture of natural pigment guanine / hypoxanthine with basic lead carbonate titanium dioxide coated with mica, bismuth oxychloride and lead hydrogengen arsenate. Arsenate), such as a thin plate powder of 0.05 ~ 0.2μ 5 ~ 50μ thickness was used in the titanium dioxide coated mica which can be easily purchased.

Pearl pigments not only have excellent gloss, but are also made of inorganic ceramics such as titanium dioxide and mica, which is ideal for blocking the loss of radiation and conduction heat due to their high thermal conductivity. It is considered to be an optimal material as a thermal insulation coating filler for clothing. However, according to the experiments of the present inventors, since pearl pigments lack heat reflectivity than metal pigments, in order to function as a heat-insulating material, it should be added two to three times than metal pigments. It was found that workability and functionality were deteriorated due to side effects such as bubble generation and pinhole formation due to excessive powder addition, reduction of gloss and heat retention due to disordered arrangement of plate pigment, pigment aggregation and precipitation during long-term storage of coating composition. It has been found that silver is a major drawback of powder coating, and it necessarily occurs when the amount of addition is increased.

The present inventors have found that the problem is solved by using a silica-based antifoam thickener and a dispersant in the form of a surfactant.

The thickener is a fine powder of a silica compound, a fine powder of 7 ~ 40nm prepared by the high-temperature flame hydrolysis method, and has the following chemical structure.

Such a silica compound also has antifoaming ability by reducing interfacial tension between a resin, a solvent, and a pigment to suppress bubble generation.

In addition, when the aluminum oxide fine powder prepared in the same manner as the silica thickener is used in parallel, more effective results can be obtained. The size of aluminum oxide is 20 ~ 40nm and the mixing ratio of aluminum oxide / silica is about 10: 90 ~ 50: 50, and the overall thickener addition ratio is about 0.5 ~ 3% of the coating composition. If it is 0.5% or less, the thickening and defoaming effect is insufficient, and if it exceeds 3%, the viscosity of the coating liquid rises due to excessive thickening, resulting in poor workability. Silica thickeners provide thixotropic properties, as well as simple thickening, and thus improve the morphological stability, storage and workability of the liquid.

Next, the dispersant may be anionic, cationic, nonionic, or amphoteric surfactant. The polar end of the dispersant is physically or chemically bonded to the pigment surface, and the other end is bonded to the binder resin to crosslink between the pigment and the binder. By suppressing the flow of the pigment to improve the arrangement of the pigment to improve the gloss and warmth, prevent the love-off properties, it was possible to exhibit the effects of preventing leakage during washing.

Dispersants usable in the present invention include an anionic, fatty acid salt or aliphatic alcohol sulfonate represented by the following formula (I) as a surfactant, sulfonated oil, alkyl sulfonate and the like.

[NH ₄ ] ^+- [OOC-CH ₂ -CH ₂ -CH _2- (CH ₂ ) _X -CH ₂ -CH ₃ ] (Ⅰ)

(x = 6-12)

As a cationic surfactant, a fatty acid amine represented by the following formula (II) or an ammonium salt and

[Cl] ^-+ [H ₃ N-CM ₂ -CM ₂ -CH _2- (CH ₂ )-(CH ₂ ) _X -CH ₂ -CH ₃ ] (II)

(x = 6-12)

Alkyl surfactant and alkyl amino carboxylate represented by the following formula (III)

CH _3- (CH ₂ ) _X -CH ₂ -NH ₃ ] ^+- [OOC-CH _2- (CH ₂ ) _X -CH ₃ ] (III)

(x = 6-12)

As the functional surfactant, aliphatic amino acids represented by the following formula (IV) and

H ₂ N-CH _2- (CH ₂ ) _X -CH ₂ -COOH (Ⅳ)

(x = 9-15)

As the non-ionic surfactant, polyalkyl ethers represented by the following formula (V) and the like are possible.

HO-C ₂ H ₄ O- (C ₂ H ₄ O) _X -C ₂ H ₄ O-CH ₂ -CH _2- (CH ₂ ) _X -CH ₂ -CH ₂ -CH ₃ (V)

(x = 2-6)

These dispersants are suitably about 0.1 to 2% of the total coating liquid and about 1 to 10% of the pigment addition amount.

In case of 0.1% or less of the total coating liquid, dispersibility is lowered and the love-off property is not completely solved. In case of 2% or more, the amount of free dispersant released and desorbed from the pigment surface increases, increasing the hydrophilicity of the coating film. This occurs.

It was confirmed that the above thickeners and dispersants showed a surprising effect on the coating for clothes, especially powder coating.

Hereinafter, the present invention will be described in detail through examples.

Example 1

Plain fabrics having a density of 210T using nylon 70 denier as bubbles were subjected to pre-treatment such as water repellent and calendering, and then wet-coated with a coating liquid of formula (VI).

100 parts of polyurethane resin (Ⅵ)

50 DMFs

Pearl pigment 30 parts

Silica thickener part 2

0.5 parts aluminum oxide

0.5 parts cationic surfactant

* Coating Thickness: 150μ (Wet)

* Solidification: Soak 5 minutes in 20 ℃

* Water washing: Soak in 50 ℃ hot water for 1 hour

* Dry: 100 ℃ 2 minutes

* Curing: 160 ° C for 1 minute (in parallel with water repellent)

Physical properties and surface state of the obtained coating cloth are shown in Table 1 below.

Comparative Example 1

In Example 1 was the same as in Example 1 except that no silica thickener, aluminum oxide, surfactant, etc. in the coating composition.

Comparative Example 2

Comparative Example 1 was the same as in Example 1 and Comparative Example 1 except that 15 parts of non-leafing aluminum paste (nonleafing aluminum paste) in place of the pearl pigment in the coating composition.

TABLE 1

* Water pressure measurement regulation: KSK 0591 (low water pressure method)

* Measurement of moisture permeability: JIS Z 0208B (Cup method)

* Insulation rate measurement regulation: KSK 0466 (The insulation rate was measured by ASTM type heat insulation measuring instrument, the radiation insulation was measured 1cm away from the test plate, the conduction heat insulation was measured in close contact with the test plate.)

* Friction fastness measurement regulation: KSS 0650 (measured by contacting coating surface with white cloth)

* LO: Property before washing, LIO: Property after washing 10 times

* Washing conditions: JIS L 1042 (F-1 method)

Claims (4)

Silica thickener and aluminum oxide fine powder in the production of water-resistant 2000mmH ₂ O, water vapor permeability 4000g / m².day, water-proof and moisture-permeable heat-resistant coating processed cloth by adding ceramic pigment with good heat reflection to polyurethane wet coating resin liquid , Method of producing excellent moisture permeability and waterproof moisture-proof foam by adding a surfactant-type dispersant to improve the gloss and thermal insulation of the coating surface, durability, love-off and pinhole prevention, storage and workability of the liquid. The method of claim 1, wherein the mixing ratio of the silica thickener and the aluminum oxide fine powder is 10 to 50% of the silica thickener. The method of manufacturing a moisture-permeable waterproof foam having excellent heat insulation and durability according to claim 1, wherein the amount of the thickener combined with the silica thickener and the aluminum oxide is 0.5 to 3% of the total coating liquid. The method for producing a moisture-permeable waterproof foam having excellent heat insulation and durability according to claim 1, wherein the amount of the dispersant added is 0.1 to 2% with respect to the total coating liquid and 1 to 10% with respect to the amount of pigment added.