A processing method for anti-yellowing nylon fabric

Abstract

This invention discloses a processing method for anti-yellowing nylon fabric, comprising the following steps: S1, immersing the nylon fabric in a quaternary ammonium salt silicone resin emulsion; S2, immersing the nylon fabric in a nano-silica sol; S3, padding the fabric with a waterproof emulsion and drying. This invention's processing method for anti-yellowing nylon fabric, by sequentially immersing the nylon fabric in a quaternary ammonium salt silicone resin emulsion, a nano-silica sol, and a waterproof emulsion, achieves excellent anti-yellowing and waterproof properties. It reduces the effects of light on the oxidation of the textile surface, avoiding photo-yellowing of the nylon fabric. After immersion in the quaternary ammonium salt silicone resin emulsion, the nylon fabric becomes cationic; subsequent immersion in the anionic nano-silica sol, due to the electrostatic attraction between ions, ensures a tight bond between the quaternary ammonium salt silicone resin emulsion and the nano-silica sol on the nylon fabric surface.

Description

Technical Field

[0001] This invention relates to a processing method for anti-yellowing nylon fabric, belonging to the field of functional textile fabrics. Background Technology

[0002] Nylon fiber is produced from polyamide through melt spinning and subsequent processing. Nylon fiber has high strength and good elasticity, exhibiting good tensile strength, tensile impact strength, flexural strength, and fatigue resistance at room temperature. It also possesses good oil and abrasion resistance, chemical resistance, electrical properties, and other desirable characteristics. Due to these excellent physical and mechanical properties, nylon is increasingly widely used in the textile industry.

[0003] Nylon has poor heat and light resistance. Long-term exposure to sunlight or ultraviolet light causes molecular oxidation and cracking, resulting in yellowing of the textile surface, a phenomenon known as photochromism of nylon fabrics. Summary of the Invention

[0004] The purpose of this invention is to provide a processing method for anti-yellowing nylon fabric, which involves applying a substance that resists ultraviolet radiation to the surface of the nylon fabric to reduce yellowing caused by ultraviolet radiation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A method for processing anti-yellowing nylon fabric includes the following steps:

[0007] S1 nylon fabric is immersed in quaternary ammonium salt silicone resin emulsion;

[0008] S2 nylon fabric is immersed in nano-silica sol;

[0009] S3 fabric is impregnated with waterproof emulsion and then dried;

[0010] The method for preparing the quaternary ammonium salt silicone resin emulsion is as follows:

[0011] Weigh out the quaternary ammonium salt type organosiloxane as shown in Formula 1, benzophenone-containing siloxane, deionized water and trace amount of potassium hydroxide, add them to the reactor, mix, and then heat to 75℃ for constant temperature hydrolysis and condensation reaction for 4 hours. Vacuum for 1 hour to remove low-boiling substances to obtain quaternary ammonium salt silicone resin. Mix water and emulsifier evenly, then add quaternary ammonium salt silicone resin, stir to emulsify, and then add acetic acid to adjust the pH value to neutral to obtain transparent quaternary ammonium salt silicone resin emulsion.

[0012]

[0013] The quaternary ammonium salt type organosiloxane is prepared by weighing 23.5g of dodecyl dimethyl tertiary amine into a reactor, adding 40mL of isopropanol to dissolve it, under nitrogen protection, adding 23.6g of γ-glycidyl etheroxypropyltrimethoxysilane and 6.6g of glacial acetic acid, stirring at 75℃ for 6h, and removing isopropanol and impurities by rotary evaporation to obtain the product quaternary ammonium salt type organosiloxane.

[0014] The processing method of the anti-yellowing nylon fabric includes step S1, in which the nylon fabric is immersed in quaternary ammonium salt silicone resin emulsion for 10 minutes, then removed and dried.

[0015] The processing method of the anti-yellowing nylon fabric involves immersing the S2 nylon fabric in nano-silica sol for 5 minutes, then removing and drying it.

[0016] The waterproof emulsion is made by emulsion polymerization of vinyl silicone oil, acrylate, emulsifier, water, and initiator.

[0017] In the processing method of the anti-yellowing nylon fabric, step S3 involves drying at 100°C for 3 minutes and baking at 160°C for 2 minutes.

[0018] The nylon fabric is woven from warp and weft yarns, and the warp and weft yarns are nylon elastic covered yarns.

[0019] The nylon fabric undergoes degreasing and refining treatment:

[0020] Nylon fabric is immersed in pretreatment solution (liquor ratio 1:10) → heated to 100℃ and kept warm for 30 minutes → cooled and washed with water; the pretreatment solution contains 3g / L NaOH, 2g / L degreasing agent, 2g / L chelating dispersant, and the remainder is water.

[0021] This invention discloses a processing method for anti-yellowing nylon fabric. The nylon fabric is sequentially impregnated with a quaternary ammonium silicate resin emulsion, nano-silica sol, and a waterproof emulsion to achieve excellent anti-yellowing and waterproof properties. After impregnation with the quaternary ammonium silicate resin emulsion, the nylon fabric becomes cationic. Subsequent impregnation with the anionic nano-silica sol utilizes electrostatic attraction between the ions to ensure a tight bond between the quaternary ammonium silicate resin emulsion and the nano-silica sol on the nylon fabric surface. If the fixation of nano-silica on the fabric surface relies solely on the subsequent waterproof emulsion, an additional amount must be applied to maintain good adhesion between the nano-silica and the fabric. However, excessive application of the waterproof emulsion will degrade the fabric's hand feel. This invention, through electrostatic interaction, reduces the amount of waterproof emulsion applied, thus ensuring both the relevant adhesion and maintaining the fabric's soft hand feel. Nano-silica reflects and scatters ultraviolet rays, thereby reducing the yellowing phenomenon of nylon fabric caused by ultraviolet radiation; synergistically with benzophenone in the quaternary ammonium silicate resin, it enhances the fabric's anti-yellowing properties. Nano-silica applied to the surface of nylon fabric forms a lotus leaf-like hydrophobic surface with the waterproof emulsion, giving the fabric excellent water-repellent properties. Benzophenone compounds are commonly used UV-resistant finishing agents for fabrics, but these organic compounds undergo migration and degradation during fabric use, weakening their effectiveness. Incorporating benzophenone compounds into the macromolecular chain through chemical reactions can improve their stability. Detailed Implementation

[0022] This invention discloses a processing method for anti-yellowing nylon fabric, comprising the following steps:

[0023] S1 nylon fabric is immersed in quaternary ammonium salt silicone resin emulsion;

[0024] S2 nylon fabric is immersed in nano-silica sol;

[0025] S3 fabric is impregnated with waterproof emulsion and then dried;

[0026] The method for preparing the quaternary ammonium salt silicone resin emulsion is as follows:

[0027] Weigh 30g of quaternary ammonium salt type organosiloxane as shown in Formula 1, 30g of benzophenone-containing siloxane, 9g of deionized water and trace amount of potassium hydroxide, add them to a three-necked flask, mix them, and then heat to 75℃ for constant temperature hydrolysis and condensation reaction for 4h. Vacuum for 1h to remove low-boiling substances to obtain quaternary ammonium salt silicone resin, which is slightly yellow and viscous.

[0028] When emulsifying quaternary ammonium salt silicone resin, first mix water and emulsifier evenly, then add quaternary ammonium salt silicone resin, stir evenly, and then add acetic acid to adjust the pH value to neutral to obtain a transparent quaternary ammonium salt silicone resin emulsion.

[0029] The mass ratio of water, emulsifier and quaternary ammonium salt silicone resin is 7:1:2; the emulsifiers are AEO-3, AEO-9 and TX-4, with a mass ratio of 4:6:3.

[0030]

[0031] The quaternary ammonium salt type organosiloxane is prepared as follows: 23.5 g of dodecyl dimethyl tertiary amine is weighed into a reactor, dissolved in 40 mL of isopropanol under nitrogen protection, followed by the addition of 23.6 g of γ-glycidyl etheroxypropyltrimethoxysilane (KH-560) and 6.6 g of glacial acetic acid. The mixture is stirred at 75 °C for 6 h, and isopropanol and impurities are removed by rotary evaporation to obtain the quaternary ammonium salt type organosiloxane. The reaction formula is as follows:

[0032]

[0033] The benzophenone-containing siloxane is prepared by an addition reaction of trimethoxysilane and 2-hydroxy-4-propenoxybenzophenone; the specific steps are as follows: 28.2 g (0.1 mol) of 2-hydroxy-4-propenoxybenzophenone (CAS No.: 2549-87-3), 80 g of toluene and 0.12 g of platinum catalyst are added to a four-necked round-bottom reflux condenser equipped with a mechanical stirrer, a reflux condenser, a constant pressure dropping funnel and a nitrogen gas delivery pipe. In a bottle, the temperature was raised to 85°C and refluxed for 30 min under a nitrogen atmosphere; 14.7 g (0.12 mol) of trimethoxysilane (CAS No.: 2487-90-3) and 10 g of toluene were weighed, mixed thoroughly, and added to a four-necked flask over 2 h using a constant pressure dropping funnel. The temperature was then raised to 100°C and held for 6 h. After cooling, the unreacted monomer was distilled under reduced pressure at 0.01 MPa. The product was benzophenone-containing siloxane.

[0034] Step S1: Immerse the nylon fabric in quaternary ammonium salt silicone resin emulsion for 10 minutes, then remove and dry.

[0035] Step S2: Immerse the nylon fabric in nano silica sol for 5 minutes, then remove and dry.

[0036] In step S3, the waterproof emulsion is prepared by emulsion polymerization of vinyl silicone oil, acrylate, emulsifier, water, and initiator, and the preparation method is as follows:

[0037] (1) Dissolve 1.6 parts of fatty alcohol polyoxyethylene ether AEO-9, 0.7 parts of alkylphenol polyoxyethylene (10) ether OP-10, 3.8 parts of sodium dodecyl sulfate SDS and 124 parts of water in water by stirring to form an aqueous solution; add 32 parts of methyl methacrylate, 13 parts of ethyl acrylate, 45 parts of butyl acrylate, 16 parts of octadecyl acrylate and 12 parts of double-terminated vinyl silicone oil and mix thoroughly, then stir at high speed to emulsify and form a pre-emulsion.

[0038] (2) In a reactor equipped with a stirrer, a condenser and a nitrogen protection device, add 72 parts water, 0.8 parts fatty alcohol polyoxyethylene ether AEO-9, 0.3 parts alkylphenol polyoxyethylene (10) ether OP-10 and 2.3 parts sodium dodecyl sulfate SDS and dissolve them.

[0039] (3) Add 1 / 4 volume of pre-emulsion to the reactor, stir and heat to 78°C, add 0.2 parts of initiator and 2 parts of water in an aqueous solution, and after blue light appears, continue to keep the temperature and react for 30 minutes.

[0040] (4) Add the remaining pre-emulsion and a solution of 0.6 parts initiator and 6 parts water, controlling the dropping rate so that the dropping process is completed within 2-3 hours;

[0041] (5) After the addition is complete, raise the temperature to 85°C and add 0.1 part of initiator and 1 part of water solution, and keep the temperature constant for 2 hours;

[0042] (6) Cool down and adjust the pH value to 7 with ammonia water to obtain a waterproof emulsion.

[0043] Double-ended vinyl silicone oil, commercially available, viscosity 250±10 mpa.s, vinyl content 1.8-2%.

[0044] In step S3, the drying method is to dry at 100℃ for 3 minutes and bake at 160℃ for 2 minutes.

[0045] The nano-silica sol mentioned in step S2 can be a commercially available product or prepared by the following conventional method: 50 mL of anhydrous ethanol and 5 mL of tetraethyl orthosilicate are added to a reactor and stirred evenly. Then, 10 mL of water and 3 mL of ammonia are added and stirred at 50 °C for 12 h to prepare nano-SiO2 sol with a particle size of about 110 nm.

[0046] The nylon fabric is woven from warp and weft yarns, and the warp and weft yarns are nylon elastic covered yarns.

[0047] If the nylon fabric greige from the loom meets the processing conditions, it can be directly subjected to anti-yellowing processing, that is, the above-mentioned immersion in quaternary ammonium salt silicone resin emulsion, nano silica sol, and padding with waterproof emulsion processing is carried out; if the nylon fabric greige needs to remove stains and impurities first, appropriate degreasing and refining treatment can be carried out before anti-yellowing processing, and conventional dyeing processes can be added later.

[0048] The nylon fabric undergoes degreasing and refining treatment before anti-yellowing finishing: the nylon fabric is immersed in the pretreatment solution → heated to 100℃ and kept warm for 30 minutes → cooled and washed with water; the pretreatment solution contains 3g / L NaOH, 2g / L degreasing agent, 2g / L chelating dispersant, and the remainder is water.

[0049] The degreasing agents and chelating dispersants involved in the degreasing and refining process are all commercially available conventional products.

[0050] Example:

[0051] Nylon fabric, warp and weft threads: 70DN+40DSP×70DN+40DSP, composition: 88% nylon + 12% spandex, weight: 138g / meter, warp and weft density: 54×49.

[0052] Degreasing and scouring treatment of nylon fabric:

[0053] Nylon fabric is immersed in pretreatment solution (liquor ratio 1:10) → heated to 100℃ and kept warm for 30 minutes → cooled and washed with water; the pretreatment solution contains 3g / L NaOH, 2g / L degreasing agent, 2g / L chelating dispersant, and the remainder is water.

[0054] A method for processing anti-yellowing nylon fabric includes the following steps:

[0055] S1 nylon fabric is immersed in quaternary ammonium salt silicone resin emulsion for 10 minutes, then removed and dried at 80℃.

[0056] S2 nylon fabric is immersed in nano silica sol for 5 minutes, then removed and dried at 80°C.

[0057] S3 fabric is impregnated with waterproof emulsion, one dip and one roll, with a roll-in rate of 60%, dried at 100℃ for 3 minutes and baked at 160℃ for 2 minutes.

[0058] The relevant performance test results of nylon fabric are as follows:

[0059] Water repellency of anti-yellowing nylon fabric: 100 points, 90 points after 10 washes.

[0060] Table 1. Test results of whiteness and UV resistance of nylon fabric

[0061] project Whiteness T(UVB)AV / % T(UVB)AV / % UPF Original fabric 82.2 5.72 5.49 24.69 Anti-yellowing nylon fabric 79.6 0.94 0.57 ＞50

[0062] Table 2. Test results of anti-yellowing performance of nylon fabrics

[0063]

[0064] After the original fabric was continuously exposed to ultraviolet light for a long time, the maximum absorption wavelength changed, that is, the color changed, indicating that the fabric had yellowing.

[0065] Raw fabric: Nylon fabric that has undergone degreasing and scouring treatment, but has not been treated to prevent yellowing.

[0066] UV protection performance test: The transmittance of ultraviolet rays of different wavelengths on the fabric is measured using a textile UV protection performance tester, and the UV protection coefficient of the fabric is calculated according to the standard GB / T 18830—2009 "Evaluation of UV protection performance of textiles".

[0067] The whiteness test is conducted in accordance with GB / T8424.2—2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles". A whiteness meter is used for the test. The fabric sample is folded into 4 layers, and different parts of the sample are tested 4 times. The average value is taken.

[0068] UV yellowing test of anti-yellowing nylon fabric: The anti-yellowing nylon fabric was placed in a UV aging chamber with the temperature set at 50℃ and the humidity at 45%. The aging time was set to 24h and 240h. The whiteness and yellowing of the test samples were analyzed.

[0069] Water repellency: Refer to AATCC-22 test.

Claims

1. A processing method of anti-yellowing nylon fabric, comprising the following steps: S1. The nylon fabric is immersed in a quaternary ammonium salt silicone resin emulsion; S2. The nylon fabric is immersed in an alkaline nano-silica sol; S3. The fabric is immersed in a waterproof emulsion and dried; The preparation method of the quaternary ammonium salt silicone resin emulsion is as follows: A quaternary ammonium salt organosiloxane, a benzophenone-containing siloxane, deionized water, and a trace amount of potassium hydroxide are weighed and added to a reactor, mixed, heated to 75°C, and hydrolyzed and condensed for 4 h. Vacuum is applied for 1 h to remove low-boiling substances, obtaining a quaternary ammonium salt silicone resin. The water and an emulsifier are mixed uniformly, then the quaternary ammonium salt silicone resin is added, stirred uniformly, and then acetic acid is added to adjust the pH value to neutral, obtaining a transparent quaternary ammonium salt silicone resin emulsion. 。 2. The method of claim 1, wherein the anti-yellowing process is characterized by: The preparation method of the quaternary ammonium salt organosiloxane is as follows: 23.5 g of dodecyl dimethyl tertiary amine is weighed into a reactor, dissolved in 40 mL of isopropyl alcohol, protected by nitrogen, and then 23.6 g of γ-glycidyl ether propyltrimethoxysilane and 6.6 g of glacial acetic acid are added. Stirring is performed at 75°C for 6 h, and isopropyl alcohol and impurities are removed by rotary evaporation, obtaining the product quaternary ammonium salt organosiloxane.

3. The method of claim 1, wherein the anti-yellowing process is characterized by: In step S1, the nylon fabric is immersed in the quaternary ammonium salt silicone resin emulsion for 10 min, taken out, and dried.

4. The method of claim 1, wherein the anti-yellowing process is characterized by: In step S2, the nylon fabric is immersed in the alkaline nano-silica sol for 5 min, taken out, and dried.

5. The method of claim 1, wherein the anti-yellowing process is characterized by: The waterproof emulsion is prepared by emulsion polymerization of vinyl silicone oil, acrylate, emulsifier, water, and initiator.

6. The method of claim 1, wherein the anti-yellowing process is characterized by: In step S3, the drying method is 100°C drying for 3 min and 160°C baking for 2 min.

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