Low-denier nylon fabric and hydrophobic oil-proof functional finishing liquid and method

Abstract

The invention provides a low-denier nylon fabric and hydrophobic oil-proof functional finishing liquid and method, and belongs to the technical field of textile chemistry and dyeing and finishing engineering.The finishing liquid is prepared from, by weight, 4-7 parts of a C6 waterproof agent, 0.2-1.4 parts of a cross-linking agent, 1-4 parts of an anti-tearing agent, 1-4 parts of a softener and 100 parts of water. The low-denier nylon fabric is subjected to hydrophobic and oil-proof modification by adopting the C6 waterproof agent, and the cross-linking agent, the anti-tear agent and the softener are introduced in the finishing process to form a mixed working solution, so that the low-denier nylon fabric has better hydrophobic, oil-proof and anti-fouling effects, the dosage of the waterproof agent is reduced, the water repellency and the washing resistance are improved, and the fabric is more durable. The hand feeling and the mechanical property of the fabric after water repellent finishing are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textile chemistry and dyeing and finishing engineering, and in particular belongs to a low-denier nylon fabric and a hydrophobic and oil-proof functional finishing liquid and a method. Background Art

[0002] With the advancement of science and technology and the improvement of material living standards, people's demand for textiles has also increased. People are no longer satisfied with the inherent characteristics of textiles, but are modifying them functionally, such as making them waterproof and oil-proof, anti-fouling, tear-resistant, and anti-washing. Low-denier nylon fabrics have high fiber crystallinity and good fiber cohesion, good light resistance and heat resistance, and the fiber surface is smooth and elastic. The fabric is thin and has good air permeability, but low-denier nylon fabrics are water-absorbent and the surface is easy to absorb dust, dirt and other stains, thus affecting the appearance and aesthetics. Therefore, it is considered to finish and modify low-denier nylon fabrics, while retaining its advantages, so that the finished fabric has a good hydrophobic and oil-proof effect. Because low-denier nylon fabrics are thin and light, the fiber surface is smooth, and the fiber cohesion is good, it is not easy for the finishing agent to produce physical bonding with the fiber, and the finishing agent is less attached, which seriously affects the hydrophobic and oil-proof effect, and the fabric is not soft enough, affecting comfort.

[0003] At present, waterproofing agents are widely used. For example, when low-denier nylon fabrics are finished with fluorine-free waterproofing agents, when the mass concentration of the waterproofing agent is 60g / L and the treatment is carried out at 160℃ for 70s, the water repellency level of low-denier nylon fabrics can reach 90 points. However, after five washes, the water repellency of the fabric surface is only 80 points, which does not have good water washing resistance. The use of fluorine-free waterproofing agents cannot improve the oil resistance of low-denier nylon fabrics. In addition, low-denier nylon fabrics are relatively thin and have poor mechanical properties. After water-repellent finishing, problems such as hard hand feel and decreased mechanical properties will occur. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a low-denier nylon fabric and a hydrophobic and oil-proof functional finishing liquid and method, using C6 waterproofing agent to modify the low-denier nylon fabric to be hydrophobic and oil-proof, introducing a cross-linking agent, an anti-tear agent and a softener to form a mixed working liquid during the finishing process, wherein the softener is a fluorine-modified amino silicone oil, which can avoid the problem of reducing the hydrophobic and oil-proof effect of the fabric due to the addition of a softener, so that the low-denier nylon fabric has a good hydrophobic and oil-proof, anti-fouling effect, reduces the amount of waterproofing agent, improves water repellency and washability, and improves the feel and mechanical properties of the fabric after water repellent finishing. At the same time, low-temperature and high-pressure rapid calendering and shaping are adopted in the finishing process, and low-temperature calendering and shaping can reduce fiber damage and also reduce energy consumption, so that the calendering and shaping process has green environmental protection. At the same time, high pressure can improve the physical combination of the finishing agent and the fiber, make the fabric fiber arrangement more closely, improve water washability, and be conducive to the improvement of hydrophobic and oil-proof performance.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabric, wherein the raw materials include, by weight: 4 to 7 parts of C6 waterproofing agent, 0.2 to 1.4 parts of cross-linking agent, 1 to 4 parts of tearing agent, 1 to 4 parts of softener, and 100 parts of water.

[0006] Furthermore, the C6 waterproofing agent is a short carbon chain acrylic fluorine-containing waterproofing agent.

[0007] Furthermore, the cross-linking agent is a blocked isocyanate cross-linking agent, and the model is Y-202.

[0008] Furthermore, the anti-tearing agent is HA-soft80 polyethylene wax emulsion.

[0009] Further, the softener is a fluorine-modified amino silicone oil emulsion containing 35% amino-functional silicone polymer and 20-25wt% fluorine;

[0010] The preparation method of the fluorine-modified amino silicone oil emulsion is as follows: under protective gas, 10% to 20% of tridecafluorooctyl acrylate is added dropwise to the amino silicone oil toluene solution, reacting at a temperature of 45° C. to 60° C. for 6 h to 8 h, and distilling under reduced pressure to obtain the fluorine-modified amino silicone oil;

[0011] The effective component content of tridecafluorooctyl acrylate is ≥98%, the mass fraction of amino groups in the amino silicone oil is 35%, and the concentration of the amino silicone oil in the amino silicone oil toluene solution is 40%-45%.

[0012] The present invention also provides a method for preparing a hydrophobic and oil-proof low-denier nylon fabric, which uses the above-mentioned hydrophobic and oil-proof functional finishing liquid to finish the low-denier nylon fabric. The specific steps are: immersing the low-denier nylon fabric in the hydrophobic and oil-proof functional finishing liquid, rolling it, drying it after two immersions and two rollings, and finally low-temperature and high-pressure rapid calendering to obtain the hydrophobic and oil-proof low-denier nylon fabric.

[0013] Furthermore, the low-denier nylon fabric is immersed in the hydrophobic and oil-proof functional finishing liquid, wherein the bath ratio of the low-denier nylon fabric to the hydrophobic and oil-proof functional finishing liquid is 1:50, and the immersion time is 25 minutes to 30 minutes.

[0014] Furthermore, the rolling wheel pressure is 2 kg, and the rolling margin is 60% to 70%.

[0015] Furthermore, the drying temperature is 80°C to 90°C, and the time is 2 to 3 minutes; the calendering temperature of low-temperature and high-pressure rapid calendering is 100°C to 120°C, the roller pressure is 130N / cm to 150N / cm, and the calendering speed is 25m / min to 30m / min.

[0016] The present invention also provides a hydrophobic and oil-proof low-denier nylon fabric, which is prepared by the above-mentioned preparation method.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The present invention provides a hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabrics, which combines a C6 waterproofing agent, a cross-linking agent, an anti-tear agent and a softener to achieve an efficient hydrophobic and oil-proof effect. The C6 waterproofing agent mainly improves the oil-proof performance of the fabric, and does not contain compounds such as perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) that are difficult to degrade; and the cross-linking agent contains an active isocyanate (R-NCO) group, which can react with the hydroxyl (-OH) in the waterproofing agent to form a stable carbamate (-NH-CO-O-) bond, thereby enhancing the bonding strength between the hydrophobic group and the fiber, and ensuring the durability of the waterproof and oil-proof effect. Since the low-denier nylon fabric itself is relatively light and thin, and has poor mechanical properties, after the hydrophobic and oil-proof finishing, problems such as hard feel and decreased mechanical properties will occur. The finishing liquid of the present invention not only focuses on the hydrophobic and oil-proof performance, but also takes into account the mechanical properties and feel of the fabric. The addition of tear-resistant agent significantly improves the tear strength of fabrics, and the addition of softener can improve the feel and flexibility of fabrics, but the film formed by softener on the surface of fabrics will increase the hydrophilicity of fabrics. Therefore, the softener considers adding fluorine-modified amino silicone oil to make the finished fabric softer and more comfortable without affecting the hydrophobic and oil-proof effect. By optimizing the formula, the amount of waterproofing agent is reduced, the consumption of chemical substances and wastewater discharge are reduced, and environmental protection requirements are met. At the same time, the efficient finishing effect also reduces the subsequent processing procedures and energy consumption.

[0019] The invention provides a preparation method of a hydrophobic and oil-proof low-denier nylon fabric. The finishing method adopts a padding method. Compared with other methods, the method is simple and has a fast processing speed, is suitable for large-scale production, and improves production efficiency. Two dips and two rolls are adopted in the padding process, so that the finishing agent fully penetrates into various parts of the fabric, reducing the uneven finishing phenomenon that may be caused by a single soaking, and by controlling the rolling rate, sufficient adsorption of the finishing agent on the fiber surface is ensured, avoiding spots and stripes caused by excessive accumulation of liquid, and improving the visual consistency of the finishing effect. The finishing agent is initially solidified in the drying stage to remove excess organic matter and moisture on the surface of the fabric. Finally, low temperature and high pressure rapid calendering is adopted in the calendering and shaping process. Low temperature is adopted to avoid deformation, fading or damage of the fabric due to excessive temperature. Rapid high pressure improves production efficiency and makes the fabric fibers more closely arranged, reducing the capillary pores and irregularities on the fiber surface, thereby improving the hydrophobic and oil-proof effect. Through this method, the production process can be optimized, so that each step can be carried out under optimal conditions, thereby improving the overall production efficiency and avoiding the problem of uneven coverage of the waterproofing agent caused by improper temperature control.

[0020] The present invention provides a hydrophobic and oil-proof low-denier nylon fabric, which is prepared by the above-mentioned preparation method. The water contact angle of the low-denier nylon fabric after finishing can reach 145.69°, and the oil contact angle can reach 116.79°. After 30 times of water washing, the water contact angle is reduced to 136.69°, and the oil contact angle is reduced to 107.59°, and it still has a good hydrophobic and oil-proof effect. The tear strength of the low-denier nylon fabric after finishing is more than doubled, and the activity and flexibility are improved. Due to its excellent hydrophobic and oil-proof properties and enhanced mechanical properties, the low-denier nylon fabric can be widely used in outdoor clothing, sports equipment, protective clothing and other fields to meet the use requirements in various complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Fourier infrared spectra of the low-denier nylon fabric of the present invention before and after finishing.

[0022] Figure 2 It is the static contact angle of the low-denier nylon fabric after finishing of the present invention.

[0023] Figure 3 A diagram showing the change in contact angle of low-denier nylon fabric after washing after finishing according to the present invention.

[0024] Figure 4 Diagram of the novel water and oil repellent mechanism of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the concept of the present invention and the technical effects produced in combination with the embodiments, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work all fall within the scope of protection of the present invention.

[0026] The invention provides a hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabrics. The raw materials include, by weight, 4 to 7 parts of a C6 waterproofing agent, 0.2 to 1.4 parts of a cross-linking agent, 1 to 4 parts of a tear resistant agent, 1 to 4 parts of a softener, and 100 parts of water.

[0027] Preferably, the C6 water repellent is a short carbon chain acrylic fluorine-containing water repellent.

[0028] Preferably, the cross-linking agent is a blocked isocyanate cross-linking agent, model Y-202, selected from Bengbu Adiya New Materials Co., Ltd.

[0029] Preferably, the tear resistant agent is HA-soft80 polyethylene wax emulsion, selected from Guangzhou Wanjun Chemical Technology Co., Ltd.

[0030] Preferably, the softener is fluorine-modified amino silicone oil, and the preparation method of fluorine-modified amino silicone oil comprises the following steps:

[0031] Adding amino silicone oil (amino mass fraction 35%) and an organic solvent into a reactor, dissolving the amino silicone oil in the solvent under stirring conditions to obtain an amino silicone oil solution with a concentration of 40% to 45%;

[0032] Under protective gas, add 10% to 20% of fluorine-containing compounds to the amino silicone oil solution, react at 40°C to 60°C for 6h to 8h, and perform reduced pressure distillation at a pressure of 30mmHg to 40mmHg and a distillation temperature of 140°C to 160°C for 1h to 1.5h to remove unreacted substances and by-products to ensure the purity of the product to obtain fluorine-modified amino silicone oil.

[0033] Among them, the organic solvent is dichloromethane, toluene, etc.;

[0034] Fluorine-containing compounds include trifluoropropyltrimethoxysilane, tridecafluorooctyl acrylate (active ingredient content ≥ 98%), perfluorooctyl methacrylate, etc.

[0035] Amino silicone oil is a product of introducing amino functional groups into the polydimethylsiloxane (PDMS) chain;

[0036] The present invention provides a method for preparing a hydrophobic and oil-proof low-denier nylon fabric, and the specific steps are as follows:

[0037] S1: Mix 4-7 parts of C6 waterproofing agent, 0.2-1.4 parts of cross-linking agent, 1-4 parts of tearing agent, 1-4 parts of softener and 100 parts of deionized water by weight to obtain a finishing solution.

[0038] S2: Immerse low-denier nylon fabric in finishing liquid, with the ratio of fabric to finishing liquid being 1:50, and soak for 25 to 30 minutes;

[0039] S3 rolls the finished low-denier nylon fabric, with a roller pressure of 2 kg and a rolling rate of 60% to 70%;

[0040] S4 immerses the fabric that has been treated by the first padding again into the finishing liquid, repeats S3 to achieve two immersions and two paddings, so that the finishing liquid is evenly immersed in the fiber while squeezing out the excess finishing liquid, and then dries.

[0041] S5 performs low-temperature and high-pressure rapid calendering and shaping on the dried fabric.

[0042] Furthermore, in S4, rolling is performed by a rolling mill with a roller pressure of 2 kg and a rolling margin of 60% to 70%.

[0043] Furthermore, in S4, drying and shaping is performed in a blast drying oven at a drying temperature of 80° C. to 90° C. for 2 min to 3 min to dry the moisture and organic solvent on the surface of the fabric.

[0044] Furthermore, in S5, low-temperature and high-pressure rapid calendering and shaping is performed using a two-roll calender, and the calender parameters are set as follows: the calendering temperature is 100°C to 120°C, the roller pressure is 130N / cm to 150N / cm, and the calendering speed is 25m / min to 30m / min.

[0045] Example 1

[0046] This embodiment discloses a method for preparing a hydrophobic and oil-proof low-denier nylon fabric, and the detailed preparation process is as follows:

[0047] Step S1: Take 6 parts of raw materials C6 waterproof agent, 0.3 parts of cross-linking agent, 1 part of tear resistant agent, 3 parts of softener, and 100 parts of deionized water, put them into a container and stir to obtain a finishing liquid.

[0048] The softener is prepared by adding 15% of tridecafluorooctyl acrylate (active ingredient content ≥ 98%) to a 45% amino silicone oil toluene solution under protective gas, reacting at 50°C for 7 hours, and performing reduced pressure distillation at a pressure of 35 mmHg and a distillation temperature of 150°C for 1.3 hours to remove unreacted substances and by-products to ensure the purity of the product to obtain fluorine-modified amino silicone oil.

[0049] Step S2: placing the low-denier nylon fabric in the finishing liquid and soaking it for 30 minutes.

[0050] Step S3: Lay the finished low-denier nylon fabric flat and put it into the rolling machine, with a roller pressure of 2 kg and a rolling rate of 65%.

[0051] Step S4: immersing the fabric that has been treated by the first padding process into the finishing liquid again, and repeating step S3 to achieve two immersions and two paddings;

[0052] Step S5: putting the rolled low-denier nylon fabric into a blast drying oven at a drying temperature of 90° C. for 2 minutes to dry out surface moisture and organic solvents.

[0053] Step S6: Calendering the shaped fabric, setting the calendering machine parameters as follows: calendering temperature of 110° C., roller pressure of 140 N / cm, and calendering speed of 25 m / min, to obtain a hydrophobic and oil-proof low-denier nylon fabric.

[0054] The low-denier nylon fabric of Example 1 before and after finishing was subjected to tear strength, style test, static contact angle, infrared spectrum and water washability test.

[0055] Measuring instruments: universal testing machine, fabric style meter, contact angle meter, Fourier infrared spectrometer, washing color fastness meter.

[0056] Table 1 Tear strength of low-denier nylon fabric before and after finishing

[0057]

[0058] The hydrophobic and oil-proof low-denier nylon fabric prepared by the present invention has a warp tearing strength increased from 4.3N to 9.7N and a weft tearing strength increased from 6.7N to 14.7N after finishing compared with the original state, and the tearing strength of the low-denier nylon fabric is increased by more than double.

[0059] Table 2 Style test of low-denier nylon fabric before and after finishing

[0060]

[0061] The hydrophobic and oil-proof low-denier nylon fabric prepared by the present invention has a maximum static friction and a dynamic friction force that are both reduced compared with the original sample before finishing, indicating that the surface flexibility is enhanced after finishing. The bending stiffness and the maximum bending force of the low-denier nylon fabric after finishing are both reduced compared with the original sample, indicating that the activity and flexibility are improved after finishing.

[0062] Figure 1 The Fourier infrared spectra of the low-denier nylon fabric of the present invention before and after finishing are shown in Figure 1. Compared with before finishing, a new ester group C=H characteristic absorption peak appears at 1732cm-1 after finishing, and a characteristic absorption peak of CF appears at 1260cm-1. This is because the waterproofing agent contains acrylic polymer and organic fluoride, indicating that the waterproofing agent has been grafted onto the surface of the low-denier nylon fabric, giving the fabric hydrophobic properties. In addition, the infrared spectrum after washing is compared with that after finishing, and it can be found that the ester group C=H and CF characteristic absorption peaks still exist. At the same time, compared with the original sample, the absorption peak at 2239cm-1 is -1 The -NCO characteristic absorption peak at 1092cm indicates that the crosslinking agent releases -NCO groups at high temperature, which also shows that after the optimization process, the low-denier nylon fabric has a better anti-washing effect. -1 The characteristic absorption peak of Si-O appearing at indicates that the softener exists on the fabric surface after finishing, giving the fabric good softness and gloss.

[0063] Figure 2 The static contact angle of the low-denier nylon fabric after finishing of the present invention is as follows: the water contact angle can reach 145.69°, and the oil contact angle can reach 116.79°.

[0064] Figure 3This is a diagram showing the change in contact angle of the low-denier nylon fabric after washing according to the present invention. The water contact angle and the oil contact angle of the low-denier nylon fabric after washing decrease with the increase in the number of washing times. After washing 30 times, the water contact angle decreases from 145.69° to 136.69°, and the oil contact angle decreases from 116.79° to 107.59°. It still has a good hydrophobic and oil-proof effect, which shows that after the optimization process, the low-denier nylon fabric has a better anti-washing effect.

[0065] Figure 4 The water-repellent and oil-proof mechanism diagram of the present invention shows that the cross-linking agent releases an isocyanate group (-NCO) under high temperature, cross-links with the hydroxyl group (-OH) in the waterproofing agent, forms a stable carbamate (-NHCOO-) covalent bond, fixes the waterproofing agent on the fabric surface, improves the bonding strength between the waterproofing agent and the fabric, and because the CF bond in the waterproofing agent has a high degree of inertness and low surface energy, it is difficult for water molecules to adhere to its surface, so that the fabric has good water-repellent and oil-proof properties. The amino (-NH2) group in the softener can react with the carboxyl (-COOH) group on the fiber surface to form an amide bond (-CONH-), which is a relatively stable covalent bond, so that the softener can be better attached to the fabric surface, and a lubricating film is formed on the fabric surface, which increases the softness and glossiness of the fabric. The adsorption sites on the fabric fiber surface are certain, and the softener and the waterproofing agent will compete for these sites. The amino silicone oil after fluorine modification grafts the CF chain to the amino group, so that the film formed by the softener also has hydrophobic and oil-proof properties.

[0066] In order to highlight the role of the modified softener, the softener addition amount was varied from 0 to 4 parts, C6 waterproof agent was 6 parts, and water was 100 parts. The low-denier nylon fabric was finished. The water contact angle of the finished fabric was measured as shown in Table 3:

[0067] Table 3 Water contact angle of fabrics after finishing with different softeners

[0068]

[0069]

[0070] As shown in Table 3, as the softener content increased, the contact angle of the fabric did not decrease significantly, indicating that after modification, the water-repellent and softener co-bath did not affect the hydrophobic and oil-proof effect of the fabric.

[0071] Example 2

[0072] This embodiment discloses a method for preparing a hydrophobic and oil-proof low-denier nylon fabric, and the detailed preparation process is as follows:

[0073] Step S1: Take 4 parts of raw materials C6 waterproof agent, 0.2 parts of cross-linking agent, 2 parts of tear resistant agent, 1 part of softener, and 100 parts of deionized water, put them into a container and stir to obtain a finishing liquid.

[0074] The softener is prepared by adding 10% trifluoropropyltrimethoxysilane to a 40% amino silicone oil dichloromethane solution under protective gas, reacting at 45°C for 8 hours, and performing reduced pressure distillation at a pressure of 30 mmHg and a distillation temperature of 160°C for 1 hour to remove unreacted substances and by-products to ensure the purity of the product to obtain fluorine-modified amino silicone oil.

[0075] Step S2: placing the low-denier nylon fabric in the finishing liquid and soaking it for 25 minutes.

[0076] Step S3: Lay the finished low-denier nylon fabric flat and put it into a rolling machine with a roller pressure of 2 kg and a rolling rate of 60%.

[0077] Step S4: immersing the fabric that has been treated by the first padding process into the finishing liquid again, and repeating step S3 to achieve two immersions and two paddings;

[0078] Step S5: putting the rolled low-denier nylon fabric into a blast drying oven at a drying temperature of 80° C. for 3 minutes to dry out surface moisture and organic solvents.

[0079] Step S6: Calendering the shaped fabric, setting the calendering machine parameters as follows: calendering temperature of 100° C., roller pressure of 150 N / cm, and calendering speed of 28 m / min, to obtain a hydrophobic and oil-proof low-denier nylon fabric.

[0080] Example 3

[0081] This embodiment discloses a method for preparing a hydrophobic and oil-proof low-denier nylon fabric, and the detailed preparation process is as follows:

[0082] Step S1: Take 5 parts of raw materials C6 waterproof agent, 1 part of cross-linking agent, 3 parts of tear resistant agent, 2 parts of softener, and 100 parts of deionized water, put them into a container and stir to obtain a finishing liquid.

[0083] The softener is prepared by adding 20% ​​perfluorooctyl methacrylate to a 45% amino silicone oil toluene solution under protective gas, reacting at 60°C for 6 hours, and performing reduced pressure distillation at a pressure of 40 mmHg and a distillation temperature of 160°C for 1.5 hours to remove unreacted substances and by-products to ensure the purity of the product to obtain fluorine-modified amino silicone oil.

[0084] Step S2: placing the low-denier nylon fabric in the finishing liquid and soaking for 26 minutes.

[0085] Step S3: Lay the finished low-denier nylon fabric flat and put it into a rolling machine with a roller pressure of 2 kg and a rolling rate of 70%.

[0086] Step S4: immersing the fabric that has been treated by the first padding process into the finishing liquid again, and repeating step S3 to achieve two immersions and two paddings;

[0087] Step S5: putting the rolled low-denier nylon fabric into a blast drying oven at a drying temperature of 85° C. for 2.5 min to dry the surface moisture and organic solvent.

[0088] Step S6: Calender the shaped fabric, and set the calendering machine parameters as follows: calendering temperature of 120° C., roller pressure of 130 N / cm, and calendering speed of 30 m / min to obtain a hydrophobic and oil-proof low-denier nylon fabric.

[0089] Example 4

[0090] This embodiment discloses a method for preparing a hydrophobic and oil-proof low-denier nylon fabric, and the detailed preparation process is as follows:

[0091] Step S1: Take 7 parts of raw materials C6 waterproof agent, 1.4 parts of cross-linking agent, 4 parts of tear resistant agent, 4 parts of softener, and 100 parts of deionized water, put them into a container and stir to obtain a finishing liquid.

[0092] The softener is prepared by adding 15% of tridecafluorooctyl acrylate (active ingredient content ≥ 98%) to a 43% amino silicone oil toluene solution under protective gas, reacting at 50°C for 7 hours, and performing reduced pressure distillation at a pressure of 35 mmHg and a distillation temperature of 150°C for 1.3 hours to remove unreacted substances and by-products to ensure the purity of the product to obtain fluorine-modified amino silicone oil.

[0093] Step S2: placing the low-denier nylon fabric in the finishing liquid and soaking for 28 minutes.

[0094] Step S3: Lay the finished low-denier nylon fabric flat and put it into a rolling machine with a roller pressure of 2 kg and a rolling rate of 68%.

[0095] Step S4: immersing the fabric that has been treated by the first padding process into the finishing liquid again, and repeating step S3 to achieve two immersions and two paddings;

[0096] Step S5: putting the rolled low-denier nylon fabric into a blast drying oven at a drying temperature of 88° C. for 2 minutes to dry out surface moisture and organic solvents.

[0097] Step S6: Calendering the shaped fabric, setting the calendering machine parameters as follows: calendering temperature of 100° C., roller pressure of 150 N / cm, and calendering speed of 30 m / min, to obtain a hydrophobic and oil-proof low-denier nylon fabric.

[0098] The hydrophobic and oil-proof low-denier nylon fabrics prepared in Examples 1 to 4 of the present invention were tested for their hydrophobic and oil-proof effects and styles. The specific data are shown in Tables 4 and 5:

[0099] Table 4 Static contact angle of low-denier nylon fabric from Example 1 to Example 4

[0100] sample Water contact angle Oil contact angle Example 1 145.69° 116.79° Example 2 144.85° 115.23° Example 3 142.74° 114.58° Example 4 144.79° 116.58°

[0101] As shown in Table 4, the hydrophobic and oil-proof low-denier nylon fabrics obtained after being treated with the finishing liquid and finishing process of the present invention have good hydrophobic and oil-proof effects.

[0102] Table 5 Low-denier nylon fabric style test from Example 1 to Example 4

[0103]

[0104]

[0105] It can be seen from Table 5 that compared with the original sample before finishing, the maximum static friction and dynamic friction of the low-denier nylon fabric treated by the present invention are both reduced, indicating that the surface flexibility is enhanced after finishing. The bending stiffness and maximum bending force of the low-denier nylon fabric after finishing are both reduced compared with the original sample, indicating that the activity and flexibility are improved after finishing.

[0106] In summary, the present invention brings significant benefits from three aspects: finishing liquid, finishing process and fabric. It not only improves the hydrophobic and oil-proof properties of low-denier nylon fabric, but also improves its mechanical properties and hand feel, providing strong support for the high-end application of low-denier nylon fabric.

[0107] Finally, it should be noted that the above embodiments provide a detailed description of the invention. For those skilled in the art, they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabrics, characterized in that: Calculated in parts by weight, the raw materials include: 4 to 7 parts of C6 waterproofing agent, 0.2 to 1.4 parts of cross-linking agent, 1 to 4 parts of tearing agent, 1 to 4 parts of softener, and 100 parts of water.

2. The hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabric according to claim 1, characterized in that: C6 waterproofing agent is a short carbon chain acrylic fluorine-containing waterproofing agent.

3. The hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabric according to claim 1, characterized in that: The cross-linking agent is a blocked isocyanate cross-linking agent, and its model is Y-202.

4. The hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabric according to claim 1, characterized in that: The anti-tear agent is HA-soft80 polyethylene wax emulsion.

5. The hydrophobic and oil-proof functional finishing liquid for low-denier nylon fabric according to claim 1, characterized in that: The softener is a fluorine-modified amino silicone oil emulsion, which contains 35% amino functional silicone polymer and 20wt% to 25wt% fluorine; The preparation method of the fluorine-modified aminosilicone oil emulsion is as follows: under protective gas, 10% to 20% of a fluorine-containing compound is added dropwise to an aminosilicone oil solution, reacting at a temperature of 45° C. to 60° C. for 6 hours to 8 hours, and distilling under reduced pressure to obtain the fluorine-modified aminosilicone oil; The mass fraction of amino groups in the amino silicone oil is 35%, and the concentration of the amino silicone oil in the amino silicone oil toluene solution is 40% to 45%.

6. A method for preparing a hydrophobic and oil-proof low-denier nylon fabric, characterized in that: The low-denier nylon fabric is finished using the hydrophobic and oil-proof functional finishing liquid described in any one of claims 1 to 5. The specific steps are: after the low-denier nylon fabric is immersed in the hydrophobic and oil-proof functional finishing liquid, it is rolled, and after two immersions and two rollings, it is dried, and finally low-temperature rapid high-pressure shaping is performed to obtain a hydrophobic and oil-proof low-denier nylon fabric.

7. The method for preparing a hydrophobic and oil-proof low-denier nylon fabric according to claim 6, characterized in that: The low-denier nylon fabric is immersed in the hydrophobic and oil-proof functional finishing liquid, wherein the bath ratio of the low-denier nylon fabric to the hydrophobic and oil-proof functional finishing liquid is 1:50, and the fabric is immersed for 25 minutes to 30 minutes.

8. The method for preparing a hydrophobic and oil-proof low-denier nylon fabric according to claim 6, characterized in that: The rolling roller pressure is 2 kg, and the rolling rate is 60% to 70%.

9. The method for preparing a hydrophobic and oil-proof low-denier nylon fabric according to claim 6, characterized in that: The drying temperature is 80°C to 90°C, and the time is 2min to 3min. The calendering temperature of the low-temperature, rapid and high-pressure shaping is 100°C to 120°C, the roller pressure is 130N / cm to 150N / cm, and the calendering speed is 25m / min to 30m / min.

10. A hydrophobic and oil-proof low-denier nylon fabric, characterized in that: The method is prepared according to any one of claims 6 to 9.

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