Preparation method of polypropylene fiber outdoor fabric

Abstract

The invention discloses a preparation method of a polypropylene outdoor fabric, which comprises the following steps: (1) applying a flame-retardant waterproof functional layer on the surface of a polypropylene base material fabric: dipping the polypropylene base material fabric in phosphorus modified silica sol, dipping twice and rolling twice, and drying; dipping the polypropylene fiber base material fabric in the flame-retardant waterproof functional finishing emulsion, dipping twice and rolling twice, drying and baking; (2) compounding the base material fabric and the functional film; gluing: coating the surfaces of the base material fabric and the functional film with a hot melt adhesive; laminating: the base material fabric and the thin film are flatly overlapped together and then moved into a pressing machine, then hot pressing time and hot pressing temperature are set, after the temperature is reached, pressing is carried out, hot pressing laminating is completed, and the polypropylene fiber outdoor fabric is prepared. The polypropylene fiber outdoor fabric prepared by the method disclosed by the invention is light in weight, comfortable, breathable and moisture permeable, and also has good flame-retardant and waterproof properties.

Description

Technical Field

[0001] The invention belongs to the field of textile fabrics, and in particular relates to a method for preparing a polypropylene outdoor fabric. Background Art

[0002] Polypropylene, commonly known as polypropylene (PP), is a synthetic fiber made from isotactic polypropylene. It has the characteristics of light weight, good chemical stability and high strength. It is widely used in the field of textiles and clothing and is one of the preferred fabrics for outdoor clothing. However, polypropylene fabrics have a low limiting oxygen index and are easy to burn, posing a safety hazard. In addition, as an outdoor fabric, its waterproof and breathable properties also need to be improved. Summary of the invention

[0003] The invention aims to provide a method for preparing a polypropylene outdoor fabric, so as to develop a fabric which is comfortable, breathable, flame-retardant and has the properties of the like.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions.

[0005] A method for preparing a polypropylene outdoor fabric comprises the following steps: (1) A flame retardant and waterproof functional layer is applied on the surface of the polypropylene base fabric The polypropylene substrate fabric is immersed in phosphorus-modified silica sol, double-immersed and double-rolled, and then dried; The polypropylene base fabric is immersed in a finishing liquid containing silicone acrylate flame retardant and waterproof emulsion, double-immersed and double-rolled, dried and baked; (2) Composite polypropylene base fabric and functional film Gluing: Hot melt adhesive is applied on the surface of polypropylene base fabric and functional film; Lamination: The polypropylene base fabric and the film are stacked together flatly, then moved to the pressing machine, and then the hot pressing time and hot pressing temperature are set. After the temperature is reached, pressing is carried out to complete the hot pressing lamination and make polypropylene outdoor fabric.

[0006] The polypropylene base material fabric has warp and weft yarns of 75D / 68F polypropylene DTY colored yarns, a warp and weft density of 52×37, and 7987 warp yarns.

[0007] The phosphorus-modified silica sol is prepared by: 15 parts of tetraethyl orthosilicate, 8 parts of phosphorus-containing siloxane and 20 parts of ethanol were added to 300 parts of distilled water, and the pH value was adjusted to 5 with hydrochloric acid; the mixture was kept at 30° C. for 20 hours and then cooled to obtain phosphorus-modified silica sol.

[0008] The finishing liquid containing silicone acrylate flame retardant waterproof emulsion is prepared by mixing the silicone acrylate flame retardant waterproof emulsion with water, and the concentration is 120 g / L.

[0009] The silicone acrylate flame retardant waterproof emulsion is prepared by polymerization of acrylate monomer, vinyl triethoxysilane, long-chain siloxane, initiator, emulsifier and water; the amount of each component is 80 parts of acrylate monomer, 6 parts of vinyl triethoxysilane, 18 parts of long-chain siloxane, 1.1 parts of initiator, 8 parts of emulsifier and 460 parts of water by weight; The preparation method of the silicone acrylate flame retardant waterproof emulsion is as follows: Add a certain amount of water and emulsifier to the container, stir evenly, drop acrylate monomer and vinyl triethoxysilane, stir for 30 minutes to obtain a pre-emulsion; dissolve the initiator with an appropriate amount of water to form an initiator aqueous solution for standby use; 1 / 3 volume of the pre-emulsion was transferred to the reactor, nitrogen was introduced for protection, and the temperature was raised under mechanical stirring; long-chain siloxane was added to the remaining 2 / 3 volume of the pre-emulsion, and sheared on a high-speed shearing machine for 15 minutes; After the temperature in the reactor rises to 75°C, add 1 / 3 volume of initiator aqueous solution to initiate polymerization reaction, and keep the temperature for 0.5h; add the remaining pre-emulsion and initiator aqueous solution dropwise within 2-3h, and keep the temperature for 4h to obtain a milky white silicone acrylate flame retardant and waterproof emulsion.

[0010] The polypropylene outdoor fabric prepared by the method of the present invention is light in weight, comfortable, breathable and moisture-permeable, and also has good flame retardant and waterproof properties.

[0011] The acrylate polymer in the silicone acrylate flame retardant waterproof emulsion contains organic siloxane side chains. Silicone has low surface tension. When forming a film, the silicone side chains will migrate to the air interface to form a hydrophobic protective layer on the surface of the film, thereby improving the waterproof performance of the fabric.

[0012] The polypropylene base fabric is first impregnated with phosphorus-modified silica sol, and then impregnated with flame-retardant and waterproof finishing emulsion, which can form a dense carbon layer on the surface of the fabric when it burns, thereby isolating the transfer of heat and oxygen, protecting the fiber material in the layer, and playing a flame-retardant role. Furthermore, nano-silicon dioxide forms a rough structure on the fiber surface, which synergizes with the waterproof layer applied later to enhance the water-repellent performance of the fabric. DETAILED DESCRIPTION

[0013] The unit "part" described in the present invention refers to "part by mass".

[0014] The invention discloses a method for preparing a polypropylene outdoor fabric, comprising the following steps: (1) A flame retardant and waterproof functional layer is applied on the surface of the polypropylene base fabric The polypropylene base fabric is impregnated in phosphorus-modified silica sol, twice dipped and twice rolled, with a rolling rate of 90%, and dried at 80℃; The polypropylene base fabric is immersed in a finishing liquid containing silicone acrylate flame retardant and waterproof emulsion, twice immersed and twice rolled, with a rolling rate of 90%, dried at 100℃ and baked at 170℃; (2) Composite polypropylene base fabric and functional film Gluing: Hot melt adhesive is applied on the surface of polypropylene base fabric and functional film; Lamination: The polypropylene base fabric and the film are stacked together flatly, then moved to the pressing machine, and then the hot pressing time and hot pressing temperature are set. After the temperature is reached, pressing is carried out to complete the hot pressing lamination and make polypropylene outdoor fabric.

[0015] The hot melt adhesive is polyurethane hot melt adhesive, a commercially available product. The hot melt adhesive is coated on the surface of the substrate fabric and the functional film in dots, the adhesive dots are discontinuously distributed, and the coverage rate of the adhesive dots on the fabric and film surface is 30%.

[0016] The polypropylene base material fabric has the following structure: Warp: 75D / 68F polypropylene DTY yarn Weft: 75D / 68F polypropylene DTY yarn Fabric structure: plain weave Total number of warps: 7987 Warp and weft density: 52×37 / cm Fabric weight: 89g / m 2 .

[0017] The raw material of the polypropylene base material fabric is color-spun yarn, which does not need to be subsequently dyed, but can be appropriately pre-treated if necessary.

[0018] The pre-treatment includes scouring and pre-setting of the fabric; Scouring: Scouring agent 2g / L, soda ash concentration 10g / L, bath ratio 1:10, fabric treated at 100℃ for 30min; Presetting: temperature 150-170℃, time 30-40s.

[0019] The functional film is a PU film with a thickness of 15 μm, a commercially available product, and has a moisture permeability function.

[0020] The phosphorus-modified silica sol is prepared by: 15 parts of tetraethyl orthosilicate, 8 parts of phosphorus-containing siloxane and 20 parts of ethanol were added to 300 parts of distilled water, and the pH value was adjusted to 5 with hydrochloric acid; the mixture was kept at 30° C. for 20 hours and then cooled to obtain phosphorus-modified silica sol.

[0021] The phosphorus-containing siloxane is prepared by: Add 0.15 mol of diethyl chlorophosphonate and 50 mL of tetrahydrofuran to a clean three-necked flask, and then add 0.15 mol of N-methylethanolamine and 0.15 mol of triethylamine under ice bath protection, and stir and react for 4 hours under ice bath. After suction filtration, remove tetrahydrofuran by vacuum distillation to obtain an intermediate. Add 0.1 mol of the intermediate and 150 ml of DMF (N, N-dimethylformamide) to a four-necked flask equipped with a stirrer, a thermometer and a condenser, heat to 90°C with stirring, and activate for 30 minutes; add 0.1 mol of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560) under nitrogen protection, heat to 80°C, keep warm for 24 hours, filter, remove DMF from the filtrate by rotary evaporation, add ethyl acetate to dissolve, and then wash with dilute hydrochloric acid, 10% NaOH solution and saturated NaCl solution for 3 times respectively, and finally remove the solvent by rotary evaporation to obtain the product, i.e., phosphorus-containing siloxane. The reaction process is shown in reaction formulas 1 and 2.

[0022]

[0023] The finishing liquid containing silicone acrylate flame retardant waterproof emulsion is prepared by mixing the silicone acrylate flame retardant waterproof emulsion with water, and the concentration of the silicone acrylate flame retardant waterproof emulsion is 120 g / L.

[0024] The silicone acrylate flame retardant waterproof emulsion is prepared by polymerization of acrylate monomer, vinyl triethoxysilane, long-chain siloxane, initiator, emulsifier and water; the amount of each component is 80 parts of acrylate monomer, 6 parts of vinyl triethoxysilane, 18 parts of long-chain siloxane, 1.1 parts of initiator sodium persulfate, 8 parts of emulsifier and 460 parts of water by weight; The preparation method of the silicone acrylate flame retardant waterproof emulsion is as follows: Add 430 parts of water and 8 parts of emulsifier to the container, stir evenly, dropwise add 80 parts of acrylate monomer and 6 parts of vinyl triethoxysilane, stir for 30 minutes to obtain a pre-emulsion; dissolve 1.1 parts of initiator in 30 parts of water to form an initiator aqueous solution for standby use; Transfer 1 / 3 volume of the pre-emulsion into the reactor, introduce nitrogen protection, and heat up under mechanical stirring; 18 parts of long-chain siloxane were added to the remaining 2 / 3 volume of the pre-emulsion and sheared on a high-speed shearing machine for 15 minutes; After the temperature of the reactor rises to 75°C, add 1 / 3 volume of initiator aqueous solution to initiate polymerization reaction, and keep the temperature for 0.5h; add the remaining pre-emulsion and initiator aqueous solution dropwise within 2-3h, and keep the temperature for 4h to obtain a milky white silicone acrylate flame retardant and waterproof emulsion.

[0025] The acrylic acid ester monomer is composed of methyl methacrylate, ethyl acrylate and butyl acrylate in a mass ratio of 2:1:5; the emulsifier includes 5 parts of sodium dodecyl sulfate, 1 part of AEO-3 and 2 parts of AEO-9.

[0026] The long-chain siloxane is prepared by: The measured phosphorus-containing siloxane and IPDI (isophorone diisocyanate) are loaded into the reactor, nitrogen is passed through, a small amount of dibutyltin dilaurate is added to catalyze the reaction, the temperature is slowly raised to 70°C, and the reaction is carried out for about 2 hours until the isocyanate value reaches the theoretical content; the measured monohydroxy-terminated dimethyl silicone oil (Mn=1000) is added, and the reaction is continued until the isocyanate value reaches the new theoretical content to obtain the product phosphorus-PDMS. The molar ratio of phosphorus-containing siloxane, IPDI, and monohydroxy-terminated dimethyl silicone oil is 1:1:1. The reaction process is shown in Reaction Formula 3.

[0027]

[0028] Embodiment 1: A method for preparing a polypropylene outdoor fabric comprises the following steps: (1) A flame retardant and waterproof functional layer is applied on the surface of the polypropylene base fabric The polypropylene base fabric is impregnated in phosphorus-modified silica sol, twice dipped and twice rolled, with a rolling rate of 90%, and dried at 80℃; The silicone acrylate flame retardant waterproof emulsion is mixed with water to form a finishing liquid of 120g / L; the polypropylene base fabric is immersed in the finishing liquid, dipped twice and rolled twice, with a rolling rate of 90%, and then dried at 100℃ and baked at 170℃; (2) Composite polypropylene base fabric and functional film Gluing: Hot melt adhesive is applied on the surface of polypropylene base fabric and functional film, and the surface coverage of hot melt adhesive on fabric and film is 30%; Lamination: The polypropylene base fabric and the film are stacked together flatly, and then moved to the pressing machine, and then the hot pressing temperature and time are set. After the temperature is reached, pressing is carried out to complete the hot pressing lamination to make polypropylene outdoor fabric; the composite pressing pressure is 4kg, the temperature is 110℃, the hot pressing time is 30s, and the speed is 5m / min.

[0029] The preparation method of the silicone acrylate flame retardant waterproof emulsion is as follows: Add 430 parts of water and 5 parts of sodium dodecyl sulfate, 1 part of AEO-3, and 2 parts of AEO-9 into a container, stir evenly, dropwise add 20 parts of methyl methacrylate, 10 parts of ethyl acrylate, 50 parts of butyl acrylate, and 6 parts of vinyl triethoxysilane, and stir for 30 minutes to obtain a pre-emulsion; dissolve 1.1 parts of sodium persulfate in 30 parts of water to form an initiator aqueous solution for later use; Transfer 1 / 3 volume of the pre-emulsion into the reactor, introduce nitrogen protection, and heat up under mechanical stirring; 18 parts of long-chain siloxane were added to the remaining 2 / 3 volume of the pre-emulsion and sheared on a high-speed shearing machine for 15 minutes; After the temperature of the reactor rises to 75°C, add 1 / 3 volume of initiator aqueous solution to initiate polymerization reaction, and keep the temperature for 0.5h; add the remaining pre-emulsion and initiator aqueous solution dropwise within 2-3h, and keep the temperature for 4h to obtain a milky white silicone acrylate flame retardant and waterproof emulsion.

[0030] The phosphorus-modified silica sol is prepared by adding 15 parts of tetraethyl orthosilicate, 8 parts of phosphorus-containing siloxane and 20 parts of ethanol to 300 parts of distilled water, adjusting the pH value to 5 with hydrochloric acid; keeping the temperature at 30°C for 20 hours and then cooling to obtain the phosphorus-modified silica sol.

[0031] Relevant properties of the polypropylene outdoor fabric prepared in Example 1: Water repellency: 100 points.

[0032] Static contact angle: 139°.

[0033] Moisture permeability: 14638g / m 2 24h.

[0034] Flame retardant properties: afterflaming time 0s, smoldering time 0s, damaged length 9.8cm.

[0035] The water repellency test is based on AATCC-22.

[0036] The moisture permeability test refers to JIS L 1099:2012; Method B-1.

[0037] The flame retardant performance is tested according to GB / T5455-2014 "Vertical method for testing the burning performance of textiles".

[0038] The static contact angle of the fabric is tested using a contact angle meter.

Claims

1. A method for preparing a polypropylene outdoor fabric, comprising the following steps: (1) A flame retardant and waterproof functional layer is applied on the surface of the polypropylene base fabric The polypropylene substrate fabric is immersed in phosphorus-modified silica sol, double-immersed and double-rolled, and then dried; The polypropylene base fabric is immersed in a finishing liquid containing silicone acrylate flame retardant and waterproof emulsion, double-immersed and double-rolled, dried and baked; (2) Composite polypropylene base fabric and functional film Gluing: Hot melt adhesive is applied on the surface of polypropylene base fabric and functional film; Lamination: The polypropylene base fabric and the film are stacked together flatly, then moved to the pressing machine, and then the hot pressing time and hot pressing temperature are set. After the temperature is reached, pressing is carried out to complete the hot pressing lamination and make polypropylene outdoor fabric.

2. The method for preparing a polypropylene outdoor fabric according to claim 1, characterized in that: The polypropylene base material fabric has warp and weft yarns of 75D / 68F polypropylene DTY colored yarns, a warp and weft density of 52×37, and 7987 warp yarns.

3. The method for preparing a polypropylene outdoor fabric according to claim 1, characterized in that: The phosphorus-modified silica sol is prepared by adding 15 parts of tetraethyl orthosilicate, 8 parts of phosphorus-containing siloxane, and 20 parts of ethanol to 300 parts of distilled water, and adjusting the pH value to 5 with hydrochloric acid; The mixture was kept at 30°C for 20 hours and then cooled to obtain phosphorus-modified silica sol.

4. The method for preparing a polypropylene outdoor fabric according to claim 1, characterized in that: The finishing liquid containing silicone acrylate flame retardant waterproof emulsion is prepared by mixing the silicone acrylate flame retardant waterproof emulsion with water, and the concentration is 120 g / L.

5. The method for preparing a polypropylene outdoor fabric according to claim 4, characterized in that: The organic silicone acrylate flame retardant waterproof emulsion is prepared by polymerization of acrylate monomer, vinyl triethoxysilane, long-chain siloxane, initiator, emulsifier and water; the amount of each component is 80 parts of acrylate monomer, 6 parts of vinyl triethoxysilane, 18 parts of long-chain siloxane, 1.1 parts of initiator, 8 parts of emulsifier and 460 parts of water by mass; the preparation method of the organic silicone acrylate flame retardant waterproof emulsion is as follows: Add a certain amount of water and emulsifier to the container, stir evenly, drop acrylate monomer and vinyl triethoxysilane, stir for 30 minutes to obtain a pre-emulsion; dissolve the initiator with an appropriate amount of water to form an initiator aqueous solution for standby use; 1 / 3 volume of the pre-emulsion was transferred to the reactor, nitrogen was introduced for protection, and the temperature was raised under mechanical stirring; long-chain siloxane was added to the remaining 2 / 3 volume of the pre-emulsion, and sheared on a high-speed shearing machine for 15 minutes; After the temperature in the reactor rises to 75°C, add 1 / 3 volume of initiator aqueous solution to initiate polymerization reaction, and keep the temperature for 0.5h; add the remaining pre-emulsion and initiator aqueous solution dropwise within 2-3h, and keep the temperature for 4h to obtain a milky white silicone acrylate flame retardant and waterproof emulsion.

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