METHOD FOR PRODUCING A WATERPROOF, MOISTURE-PERMEABLE FUNCTIONAL TISSUE

Abstract

Method for manufacturing a waterproof, moisture-permeable functional fabric, comprising: a) Production of a waterproof equipment fleet according to a technical formula; b) Impregnating a fabric body with the waterproof finishing fluid and applying scarves; c) Pre-baking and baking; and d) Applying an adhesive layer to the surfaces of the fabric body and a thin layer, seamlessly overlapping, transferring to a press machine for pressing and completing the hot press lamination to obtain the waterproof, moisture-permeable functional fabric; where The waterproof equipment fleet is produced by mixing a crosslinking agent and an emulsion of nano-silica modified polysiloxane; The crosslinking agent is an aqueous, blocked polyurethane; The emulsion of nano-silica-modified polysiloxane is produced in the following steps: 1) Addition of vinyl polysiloxane with terminal amino groups, surface-modified nanosilicon dioxide, the photocatalyst DMPA (2,2-bis(hydroxymethyl)propionic acid), and freshly evaporated THF (tetrahydrofuran) sequentially to a reactor, dissolution of the reactant, and subsequent irradiation and reaction for 30 minutes under UV light with stirring; after the reaction, removal of THF under vacuum, precipitation of the reaction product three times in pure methanol to remove unreacted raw materials and the catalyst, and vacuum drying to a constant weight to obtain a nanosilica-modified polysiloxane, wherein the molar ratio of the "-C=C" group in the vinyl polysiloxane with amino end groups to the "-SH" group in the surface-modified nanosilica is 1:1.05; 2) Mixing nanosilicon dioxide-modified polysiloxane and an emulsifier in a mass ratio of 10:1, adding a mixture of water and acetic acid while stirring, wherein the mass ratio of acetic acid to nanosilicon dioxide-modified polysiloxane is 1:30; stirring until a clear solution is obtained to obtain the emulsion of nanosilicon dioxide-modified polysiloxane; and wherein the waterproof, moisture-permeable functional fabric comprises the fabric body, the waterproof layer arranged on a surface of the fabric body, the thin film, and the adhesive layer bonding the fabric body to the thin film, wherein the fabric body seamlessly overlaps the thin film, and the fabric body is an elastic polyester-polyurethane fabric.

Description

TECHNICAL AREA

[0001] The present disclosure relates to the field of functional fabrics, in particular a method for producing waterproof, moisture-permeable functional fabrics. TECHNICAL BACKGROUND

[0002] Outdoor sports are becoming increasingly popular. These activities generate significant heat and sweat. Clothing should therefore offer good heat dissipation and breathability, making waterproof, moisture-wicking fabrics the best choice. There are generally three types of fabrics for waterproof, moisture-wicking clothing: high-density woven fabrics, coated fabrics, and laminated composite fabrics. High-density woven fabrics have poor water resistance but excellent moisture permeability; coated fabrics have excellent water resistance but poor moisture permeability; only laminated composite fabrics offer both excellent water resistance and excellent moisture permeability.Therefore, laminated composite materials are predominantly used on the market today for waterproof, moisture-permeable garments. The so-called water repellency (also known as hydrophobicity) and moisture permeability of the fabric refer to the fact that the fabric is not water-permeable under the influence of a certain water pressure, but that perspiration vapors released by the human body can diffuse through the fabric or be released into the external environment without accumulating and condensing between the body surface and the fabric.

[0003] US 4 560 611 A discloses a moisture-permeable, waterproof coated fabric with a microporous polyurethane layer 18 obtained by the so-called wet coagulation process using a polar organic solvent solution as the coating solution, containing 8 to 2 wt.% of a polyurethane elastomer, 0.1 to 10 wt.% of a water-repellent agent, 0.2 to 3 wt.% polyisocyanate and 1 to 8 wt.% of a noninoic surfactant.

[0004] DE 689 12 367 T2 discloses a surface-modified, fully aromatic polyamide fiber 1, the fiber matrix of which contains fine inorganic particles 2 with cation exchanger properties. These particles 2 are distributed on and within a surface region of the fiber and carry an additive 3 comprising cationic organic compounds or organic silicone compounds with two or more types of reactive radicals. The modification is carried out after the spinning step by applying the particles 2 and subsequent additive treatment. The fiber 1 exhibits improved adhesion to synthetic resins and rubber, reduced friction, and increased resistance to polar solvents such as dimethylformamide.

[0005] DE 692 10 698 T2 discloses a water vapor-permeable, waterproof-coated fabric comprising a fibrous base fabric and a porous film applied to one side of the base fabric. The porous film contains a synthetic polymer consisting mainly of a polyurethane resin and inorganic fine particles with a mean particle diameter of no more than 0.1 µm. Microcells interconnected in the thickness direction of the porous film form a honeycomb core structure with a diameter of 1 to 20 µm. The porous film has a multitude of micropores with a diameter of no more than 1 µm.

[0006] JP 5 548 344 B2 discloses a moisture-permeable, waterproof fabric formed by laminating a fabric, a microporous polyurethane film, an adhesive layer, and another fabric in that order. The microporous polyurethane film has a thickness of 10 to 50 µm and contains 15 to 45 wt.% powder based on pyrogenic silica. The adhesive layer is provided in the form of a pattern.

[0007] CN 1 13 276 533 A discloses a method for producing a waterproof composite fabric with low moisture resistance, comprising: Step 1, producing a waterproof finishing bath from a waterproof agent and water according to a technical formulation; Step 2, pre-baking and baking; and Step 4, coating adhesive dots on the outer fabric and a film, uniformly overlapping, transferring to a press machine for pressing and completing the hot press lamination to obtain the waterproof composite fabric with low moisture resistance. SUMMARY

[0008] One objective of the present disclosure is to provide a method for manufacturing waterproof, moisture-permeable functional fabrics.

[0009] To achieve the above-mentioned goal, this disclosure provides the following technical solutions.

[0010] A method for manufacturing a waterproof, moisture-permeable functional fabric is provided, comprising the following: a fabric body, a waterproof layer arranged on a surface of the fabric body, a thin film and an adhesive layer bonding the fabric body to the thin film, the fabric body seamlessly overlapping the thin film, and the fabric body being an elastic polyester-polyurethane fabric.

[0011] The waterproof, moisture-permeable functional fabric is manufactured through the following steps: a) Providing a fleet of waterproof equipment according to a technical recipe; b) Impregnating a fabric body with the waterproof finishing fluid and applying scarves; c) Pre-baking and baking; and d) Applying an adhesive layer to the surfaces of the fabric body and a thin layer, seamlessly overlapping, transferring to a press machine for pressing and completing the hot press lamination to obtain the waterproof, moisture-permeable functional fabric; wherein the waterproof equipment fleet is produced by mixing a crosslinking agent and an emulsion of nano-silica modified polysiloxane; The crosslinking agent is an aqueous blocked polyurethane; the emulsion of nano-silica-modified polysiloxane is produced in the following steps: 1) Addition of vinyl polysiloxane with terminal amino groups, surface-modified nanosilicon dioxide, the photocatalyst DMPA (2,2-bis(hydroxymethyl)propionic acid), and freshly evaporated THF (tetrahydrofuran) sequentially to a reactor, dissolution of the reactant, and subsequent irradiation and reaction for 30 minutes under UV light with stirring; after the reaction, removal of THF under vacuum, precipitation of the reaction product three times in pure methanol to remove unreacted raw materials and the catalyst, and vacuum drying to a constant weight to obtain a nanosilica-modified polysiloxane, wherein the molar ratio of the "-C=C" group in the vinyl polysiloxane with amino end groups to the "-SH" group in the surface-modified nanosilica is 1:1.05; 2) Mixing nanosilicon dioxide-modified polysiloxane and an emulsifier in a mass ratio of 10:1, adding a mixture of water and acetic acid while stirring, wherein the mass ratio of acetic acid to nanosilicon dioxide-modified polysiloxane is 1:30; stirring until a clear solution is obtained to obtain the emulsion of nanosilicon dioxide-modified polysiloxane; and The waterproof, moisture-permeable functional fabric comprises the fabric body, a waterproof layer arranged on a surface of the fabric body, the thin layer, and the adhesive layer that bonds the fabric body to the thin layer, with the fabric body seamlessly overlapping the thin layer, and the fabric body being an elastic polyester-polyurethane fabric.

[0012] In some versions, the fabric body consists of: Warp thread: A, FDY70D / 48F+40DSP; Weft thread combination: A, FDY70D / 48F+40DSP and B, FDY160D / 136F; Fabric structure: Plain weave 1:1; Warp / weft density of the raw fabric: 34 warp threads × 30.5 weft threads / cm.

[0013] In some versions, the adhesive layer is a polyurethane (PU) hot melt adhesive.

[0014] In some versions, the thin film is a PU layer with a thickness of 10-20 µm.

[0015] According to the present disclosure, the waterproof, moisture-permeable functional fabric is produced by foularding a fabric body in a waterproof finishing fluid to form a waterproof cover, and is then combined with a functional film that has excellent properties in terms of water repellency, moisture permeability and air permeability.

[0016] The waterproof finish is produced by mixing a crosslinking agent and an emulsion of nano-silica-modified polysiloxane. The waterproof layer that forms on the surface of the polyester fiber has a micro-nano papillary structure similar to the surface of a lotus leaf, which, in combination with low-surface-tension organosilicon, gives the fabric excellent hydrophobic properties.

[0017] The alkaline peeling process hydrolyzes the polyester fabric, creating an etching effect on the surface of the polyester fibers and generating uneven depressions and holes, thus forming a micro-nano roughness structure on the surface of the polyester fibers. With nano-silica-modified polysiloxane, a hydrophobic layer forms on the surface of this micro-nano roughness structure, giving the fabric excellent hydrophobic properties.

[0018] Nanosilica-modified polysiloxane has the disadvantage of poor adhesion to textiles and low mechanical strength. After the polyester fiber undergoes alkaline peeling, hydroxyl groups form on the fiber surface. A blocked polyurethane crosslinking agent can react with the hydroxyl groups on the polyester fiber surface and the amino groups in the polysiloxane molecules, thus fixing the nanosilica-modified polysiloxane to the fabric surface via chemical bonds and improving the durability of the fabric's hydrophobic properties. DETAILED DESCRIPTION OF THE EXECUTIONS

[0019] The present disclosure provides a method for manufacturing waterproof, moisture-permeable functional fabrics, comprising the following steps: a) Production of a waterproof equipment fleet according to a technical formula; b) Impregnating a fabric body with the waterproof finishing fluid and applying scarves; c) Pre-baking and baking; and d) Applying an adhesive layer to the surfaces of the fabric body and a thin layer, seamlessly overlapping, transferring to a press machine for pressing and completing the hot press lamination to obtain the waterproof, moisture-permeable functional fabric; wherein the waterproof equipment fleet is produced by mixing a crosslinking agent and an emulsion of nano-silica modified polysiloxane; The crosslinking agent is an aqueous, blocked polyurethane; The emulsion of nano-silica-modified polysiloxane is produced in the following steps: 1) Addition of vinyl polysiloxane with terminal amino groups, surface-modified nanosilicon dioxide, the photocatalyst DMPA (2,2-bis(hydroxymethyl)propionic acid), and freshly evaporated THF (tetrahydrofuran) sequentially to a reactor, dissolution of the reactant, and subsequent irradiation and reaction for 30 minutes under UV light with stirring; after the reaction, removal of THF under vacuum, precipitation of the reaction product three times in pure methanol to remove unreacted raw materials and the catalyst, and vacuum drying to a constant weight to obtain a nanosilica-modified polysiloxane, wherein the molar ratio of the "-C=C" group in the vinyl polysiloxane with amino end groups to the "-SH" group in the surface-modified nanosilica is 1:1.05; 2) Mixing nanosilicon dioxide-modified polysiloxane and an emulsifier in a mass ratio of 10:1, adding a mixture of water and acetic acid while stirring, wherein the mass ratio of acetic acid to nanosilicon dioxide-modified polysiloxane is 1:30; stirring until a clear solution is obtained to obtain the emulsion of nanosilicon dioxide-modified polysiloxane; and The waterproof, moisture-permeable functional fabric comprises the fabric body, a waterproof layer arranged on a surface of the fabric body, the thin layer, and the adhesive layer that bonds the fabric body to the thin layer, with the fabric body seamlessly overlapping the thin layer, and the fabric body being an elastic polyester-polyurethane fabric.

[0020] The fabric body consists of: Warp thread: A, FDY70D / 48F+40DSP; Weft combination: A, FDY70D / 48F+40DSP and B, FDY160D / 136F; Fabric structure: Plain weave 1:1; Warp / weft density of the raw fabric: 34 warp threads × 30.5 weft threads / cm.

[0021] The adhesive layer is a commercially available PU hot melt adhesive.

[0022] The thin film is a commercially available PU layer or film with a thickness of 10-20 µm.

[0023] The waterproofing solution consists of a crosslinking agent and an emulsion of nanosilica-modified polysiloxane in a mass ratio of 1:20. During use, the crosslinking agent is slowly added to the emulsion of nanosilica-modified polysiloxane and stirred to mix them evenly.

[0024] The crosslinking agent is an aqueous blocked polyurethane as a commercially available product, such as the aqueous blocked isocyanate curing agent BL5335 (Covestro AG, Germany).

[0025] The emulsion of nano-silica modified polysiloxane is obtained by reacting a thiol group of vinylpolysiloxane with amino end groups with “C=C” on a side chain to disperse nano-silica on a polysiloxane molecular chain without agglomeration occurring during subsequent use.

[0026] Vinylpolysiloxane with terminal amino groups is produced as follows:

[0027] Addition of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, octamethylcyclotetrasiloxane, and tetramethyltetravinylcyclotetrasiloxane to a dried four-necked flask equipped with a thermometer and stirrer in a molar ratio of 1:40:2; heating to a reaction temperature with stirring and addition of a specific amount of trifluoromethanesulfonic acid; holding and allowing the reaction to proceed for a specific time; after the reaction, addition of anhydrous Na₂CO₃, stirring, and neutralization to a pH of 6–7; filtration; distillation under reduced pressure (at 90°C, a vacuum of -0.1 MPa or lower) to remove unreacted monomers to obtain a colorless and transparent liquid product, namely vinylpolysiloxane with amino end groups, with a conversion rate of 91.5%. n (g / mol) of 12776 and a C=C bond content of 0.626 mmol / g. The reaction process is shown in equation (2) below.

[0028] The surface-modified nano-silicon dioxide is produced as follows:

[0029] Weigh out an approximate amount of nano-SiO2, add it to pure alcohol, stir magnetically to disperse the nano-SiO2 uniformly, adjust the pH to 4 with an HCl solution; add the silane coupling agent KH590 (γ-mercaptopropyltrimethoxysilane) dropwise to the system, mix thoroughly, and transfer to a three-necked flask. Maintain the system temperature at 80 °C, stir, and allow the reaction to proceed for 10 h. Cool. Filter the mixture by suction, wash, and dry to obtain KH590-modified nano-SiO2. The mass ratio of nano-SiO2, the silane coupling agent KH590, and pure alcohol is 10:1.5:100. The relative percentage grafting of the silane coupling agent on the surface of nano-SiO2 is approximately 10%. ● stands for nano-silica. The reaction process is shown in equation (3) below. Example 1:

[0030] A waterproof, moisture-permeable functional fabric is manufactured in the following steps: a) An aqueous blocked isocyanate hardener BL5335 was slowly added to an emulsion of nano-silica modified polysiloxane in a ratio of 1:20 and stirred to mix the two evenly and to produce a water-resistant equipment bath; b) a fabric sample was impregnated in the waterproof finishing bath, dipped twice and worked twice with a roughness of 80%; c) The tissue sample was pre-baked at 90°C for 2 minutes and then baked at 130°C for 30-60 seconds to form a waterproof layer; and d) A PU hot melt adhesive was applied to the surfaces of the fabric body and the PU layer. The fabric was seamlessly overlapped with the thin film or foil and placed in a press. The hot pressing time was set to 30 seconds and the temperature to 110 °C. Once the temperature was reached, the overlapped fabric was pressed, completing the hot press lamination and creating a waterproof, moisture-permeable functional fabric.

[0031] The waterproof, moisture-permeable functional fabric comprised a fabric body, a waterproof layer arranged on a surface of the fabric body, a thin layer, and an adhesive layer that bonded the fabric body to the thin layer; the fabric body was an elastic polyester-polyurethane fabric.

[0032] The fabric consisted of: Warp thread: A, FDY70D / 48F+40DSP; Weft thread combination: A, FDY70D / 48F+40DSP and B, FDY160D / 136F; Fabric structure: Plain weave 1:1; Warp / weft density of the raw fabric: 34 warp threads × 30.5 weft threads / cm. The ratio of weft A to weft B was 2:1.

[0033] The water-repellent properties and moisture permeability of the resulting waterproof, moisture-permeable functional fabric were tested. The results were as follows: the water repellency rating was 5 before washing and 4 after five washes; the hydrostatic compressive strength was 19,000 mmH2O; the moisture permeability was ≥10,000 g / m². 2 / 24 h.

[0034] The water repellency was tested according to GB / T 4745-2012 “Textiles - Testing and Evaluation for Water Resistance - Spray Test Method”; the water permeability was tested according to JIS L 1092-1998 “Test Methods for Water Resistance of Textiles”; the moisture permeability was tested according to JIS L 1099-2006 “Test Methods for Water Vapor Permeability of Textiles”.

Claims

[1] Method for producing a waterproof, moisture-permeable functional fabric, comprising: a) Production of a waterproof equipment fleet according to a technical formula; b) Impregnating a fabric body with the waterproof finishing fluid and applying scarves; c) Pre-baking and baking; and d) Applying an adhesive layer to the surfaces of the fabric body and a thin layer, seamlessly overlapping, transferring to a press machine for pressing and completing the hot press lamination to obtain the waterproof, moisture-permeable functional fabric; where The waterproof equipment fleet is produced by mixing a crosslinking agent and an emulsion of nano-silica modified polysiloxane; The crosslinking agent is an aqueous, blocked polyurethane; The emulsion of nano-silica-modified polysiloxane is produced in the following steps: 1) Addition of vinyl polysiloxane with terminal amino groups, surface-modified nanosilicon dioxide, the photocatalyst DMPA (2,2-bis(hydroxymethyl)propionic acid), and freshly evaporated THF (tetrahydrofuran) sequentially to a reactor, dissolution of the reactant, and subsequent irradiation and reaction for 30 minutes under UV light with stirring; after the reaction, removal of THF under vacuum, precipitation of the reaction product three times in pure methanol to remove unreacted raw materials and the catalyst, and vacuum drying to a constant weight to obtain a nanosilica-modified polysiloxane, wherein the molar ratio of the "-C=C" group in the vinyl polysiloxane with amino end groups to the "-SH" group in the surface-modified nanosilica is 1:1.05; 2) Mixing nanosilicon dioxide-modified polysiloxane and an emulsifier in a mass ratio of 10:1, adding a mixture of water and acetic acid while stirring, wherein the mass ratio of acetic acid to nanosilicon dioxide-modified polysiloxane is 1:30; stirring until a clear solution is obtained to obtain the emulsion of nanosilicon dioxide-modified polysiloxane; and wherein the waterproof, moisture-permeable functional fabric comprises the fabric body, the waterproof layer arranged on a surface of the fabric body, the thin film, and the adhesive layer bonding the fabric body to the thin film, wherein the fabric body seamlessly overlaps the thin film, and the fabric body is an elastic polyester-polyurethane fabric. [2] Method according to claim 1, wherein the fabric body comprises: Warp: A, FDY70D / 48F+40DSP; Weft combination: A, FDY70D / 48F+40DSP and B, FDY160D / 136F; Fabric structure: Plain weave 1:1; Warp / weft density of the raw fabric: 34 warp threads × 30.5 weft threads / cm. [3] Method according to claim 1, wherein the adhesive layer is a PU (polyurethane) hot melt adhesive. [4] Method according to claim 1, wherein the thin film is a PU film with a thickness of 10-20 µm.