Warm nylon fabric and preparation method thereof

Abstract

The present invention relates to a thermal insulation nylon fabric and a method for preparing the same. The fabric can be produced by the following method: first, preparing LiNO3·3H2O / polyamide microcapsule powder; then, blending the LiNO3·3H2O / polyamide microcapsule powder with polyamide particles to produce microcapsule-containing polyamide particles; and finally, spinning the yarn using a melt spinning machine to weave the yarn into a fabric, which is the thermal insulation nylon fabric. The nylon fabric produced by the present invention has an air permeability range of 749.8 to 768.4 mm / s and a Clo value range of 0.95 to 0.98, indicating that the nylon fabric produced by the present invention has good thermal insulation performance without compromising air permeability.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric preparation, and particularly relates to a warm-keeping nylon fabric and a preparation method thereof. Background Art

[0002] With the progress of society and the development of economy, people have put forward more and higher requirements for clothing, and are more advocating and pursuing warmth, comfort and health. In this situation, preparing textile fabrics with excellent thermal insulation performance is one of the research and development directions.

[0003] Nylon is a fiber made by cutting and spinning polyamide (PA) into tow. While fabrics woven from nylon currently offer excellent strength, low density, lightweight fabric, good elasticity, fatigue resistance, and excellent chemical stability, with alkali resistance but not acid resistance, traditional nylon fibers suffer from poor thermal insulation and breathability, necessitating improvements. Numerous types of thermal insulation fibers are currently available on the market, primarily achieving this by reducing heat loss through conduction, convection, and radiation, or by utilizing environmental energy through physical and chemical reactions.

[0004] Literature research indicates that the thermal insulation properties of nylon fabrics have attracted widespread attention. For example, Chinese Invention Patent Application No. 201110380484.3 discloses a process for manufacturing hollow polyester micro-denier fibers. By increasing the hollowness of the fibers, the amount of static air within them is increased, improving thermal resistance and achieving a warming effect. However, with increasing squeezing and washing cycles, the hollow fibers in this invention may deform and gradually lose their thermal insulation properties. Chinese Invention Patent Application No. 201520870829.7 discloses a process for preparing thermally insulating and breathable nylon fibers. This fiber comprises a fiber body with a circular cross-section, a cavity for air circulation within the body, thermally insulating particles embedded within the fiber body, and protrusions on the outer surface of the fiber body, coated with a photocatalyst layer. The cavity comprises a cross-shaped cavity at the center, with arc-shaped cavities connected to the ends of the cross-shaped cavity, and no two adjacent arc-shaped cavities are connected. However, friction between these patented fibers can increase the temperature, generating static electricity between the fibers. This can lead to discharges when people or objects come into contact with each other, potentially causing harm to the human body and even electric shock. Therefore, developing a nylon fabric with excellent heat-generating and warmth-retaining properties is of great significance. Summary of the Invention

[0005] In view of the above-mentioned drawbacks in the prior art, the object of the present invention is to provide a warm nylon fabric and a preparation method thereof.

[0006] The object of the present invention is to provide a warm nylon fabric, which has the characteristics of heat preservation and environmental protection. The fabric can be prepared by the following method: first, the present invention prepares LiNO3·3H2O / polyamide microcapsule powder; then, the LiNO3·3H2O / polyamide microcapsule powder is blended with polyamide particles to prepare polyamide particles containing microcapsules; finally, the silk threads are spun through a melt spinning machine to weave into fabric, and the fabric is the warm nylon fabric.

[0007] The object of the present invention is achieved through the following technical solutions:

[0008] A method for preparing a warm nylon fabric comprises the following steps:

[0009] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: polyamide is dissolved in a mixed solvent of dichloromethane and carbon tetrachloride to form solution a; LiNO3·3H2O and emulsifier Span 60 are dissolved in water to form solution b; solution b is added dropwise to solution a under stirring conditions to obtain a mixed solution; the mixed solution is emulsified at high speed in an emulsifier to obtain emulsion c; emulsion c is added dropwise to a beaker filled with tap water under stirring conditions to form a white emulsion, and the dichloromethane and carbon tetrachloride are continuously stirred to completely evaporate to obtain emulsion d containing microcapsules; emulsion d is washed with ethanol, centrifuged, and dried to obtain LiNO3·3H2O / polyamide microcapsule powder.

[0010] Preferably, the time for high-speed emulsification of the mixed liquid in the emulsifier is 10 to 20 minutes.

[0011] Preferably, the ratio of dichloromethane to carbon tetrachloride in the mixed solvent is 1 mL: (2-4) mL.

[0012] Preferably, the usage ratio of the polyamide to the mixed solvent of dichloromethane and carbon tetrachloride is 1 g: (20-40) mL.

[0013] Preferably, the usage ratio of LiNO3·3H2O, emulsifier Span 60 and water is 1g: (0.1-0.3)g: (100-200)mL.

[0014] Preferably, the solution a is added dropwise to the solution b for 30 to 60 minutes.

[0015] Preferably, the dosage ratio of solution b to solution a is 1 mL:(5-7) mL.

[0016] Preferably, the stirring time for completely volatilizing the dichloromethane and carbon tetrachloride is 5 to 6 hours, and the stirring temperature is 40 to 50°C.

[0017] (2) Blending and granulation: The LiNO3·3H2O / polyamide microcapsule powder prepared in step (1) is granulated with polyamide particles through a screw extruder to achieve blending and prepare polyamide particles containing microcapsules.

[0018] Preferably, the ratio of the microcapsule powder prepared in step (1) to the polyamide is 1 g: (100-200) g.

[0019] (3) Melt spinning and fabric preparation: The polyamide particles containing microcapsules obtained in step (2) are spun through a melt spinning machine, and the silk threads are woven into fabric, which is a warm nylon fabric.

[0020] The method for preparing microcapsules of the present invention is a solvent volatilization method. The principle of the solvent volatilization method is to dissolve the core material and the wall material in a solvent to form an emulsion, and then volatilize the dispersed phase volatile solvent from the emulsion to prepare the microcapsules.

[0021] The present invention has the following notable features:

[0022] (1) The present invention adopts a solvent volatilization method to prepare a LiNO3·3H2O / polyamide microcapsule phase change material with LiNO3·3H2O as the core material and polyamide as the wall material.

[0023] (2) LiNO3·3H2O is an excellent inorganic phase change material with thermal energy storage and temperature control functions; however, its use in nylon fabrics presents the problem of poor compatibility. The applicants of the present invention unexpectedly discovered that by preparing it as a LiNO3·3H2O / polyamide microcapsule phase change material, the microcapsules are made of polyamide as the wall material, so that the microcapsules can effectively solve the problem of poor compatibility between LiNO3·3H2O and polyamide fibers.

[0024] (3) The raw materials of the warm nylon fabric prepared by the present invention are widely available, the preparation process is simple, and it has a good market promotion prospect.

[0025] (4) The thermal insulation performance of the thermal insulation nylon fabric prepared by the present invention is not significantly weakened after 10 washings, which indicates that the LiNO3·3H2O / polyamide microcapsule phase change material is well sealed and preserved in the fabric without leakage.

[0026] (5) The air permeability of the nylon fabrics prepared by the present invention ranged from 749.8 to 768.4 mm / s, which was slightly lower than the air permeability of the nylon fabrics before finishing and was within the normal range. The Kroger values ​​of the nylon fabrics prepared by the present invention ranged from 0.95 to 0.98, which was significantly higher than the Kroger values ​​of the nylon fabrics before finishing. After 10 washes, the Kroger values ​​of the fabrics did not decrease significantly, indicating that the nylon fabrics prepared by the present invention have good thermal insulation performance without affecting air permeability. DETAILED DESCRIPTION

[0027] The following examples and comparative examples illustrate the present invention in detail.

[0028] Example 1

[0029] In this embodiment, a warm nylon fabric is prepared by the following method, including the following steps:

[0030] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: 10 g of polyamide was dissolved in a mixed solvent of 75 mL of dichloromethane and 225 mL of carbon tetrachloride to form solution a; 0.1 g of LiNO3·3H2O and 0.02 g of emulsifier Span 60 were dissolved in 15 mL of water to form solution b; 10 mL of solution b was added dropwise to 60 mL of solution a under stirring conditions for 45 min to obtain a mixed solution; the mixed solution was emulsified at high speed in an emulsifier for 15 min to obtain emulsion c; emulsion c was added dropwise to a beaker containing 200 mL of tap water under stirring conditions to form a white emulsion, and the dichloromethane and carbon tetrachloride were completely volatilized by continuous stirring for 5.5 h at a stirring temperature of 45°C to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged, and dried to obtain LiNO3·3H2O / polyamide microcapsule powder.

[0031] (2) Blending and granulation: 1 g of the LiNO3·3H2O / polyamide microcapsule powder prepared in step (1) was granulated with 150 g of polyamide particles through a screw extruder to achieve blending and prepare polyamide particles containing microcapsules.

[0032] (3) Melt spinning and fabric preparation: The polyamide particles containing microcapsules obtained in step (2) are spun through a melt spinning machine, and the silk threads are woven into fabric, which is a warm nylon fabric.

[0033] Example 2

[0034] In this embodiment, a warm nylon fabric is prepared by the following method, including the following steps:

[0035] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: 10 g of polyamide was dissolved in a mixed solvent of 66 mL of dichloromethane and 134 mL of carbon tetrachloride to form solution a; 0.1 g of LiNO3·3H2O and 0.01 g of emulsifier Span 60 were dissolved in 10 mL of water to form solution b; 10 mL of solution b was added dropwise to 50 mL of solution a under stirring conditions to obtain a mixed solution; the mixed solution was emulsified at high speed in an emulsifier for 10 min to obtain emulsion c; emulsion c was added dropwise to a beaker containing 200 mL of tap water under stirring conditions to form a white emulsion, and the stirring was continued for 5 h to completely volatilize the dichloromethane and carbon tetrachloride, and the stirring time was 40°C to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged, and dried to obtain LiNO3·3H2O / polyamide microcapsule powder.

[0036] (2) Blending and granulation: 1 g of the LiNO3·3H2O / polyamide microcapsule powder prepared in step (1) was granulated with 100 g of polyamide particles through a screw extruder to achieve blending and prepare polyamide particles containing microcapsules.

[0037] (3) Melt spinning and fabric preparation: The polyamide particles containing microcapsules obtained in step (2) are spun through a melt spinning machine, and the silk threads are woven into fabric, which is a warm nylon fabric.

[0038] Example 3

[0039] In this embodiment, a warm nylon fabric is prepared by the following method, including the following steps:

[0040] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: 10 g of polyamide was dissolved in a mixed solvent of 80 mL of dichloromethane and 320 mL of carbon tetrachloride to form solution a; 0.1 g of LiNO3·3H2O and 0.03 of emulsifier Span 60 were dissolved in 20 mL of water to form solution b; 10 mL of solution b was added dropwise to 70 mL of solution a under stirring conditions to obtain a mixed solution; the mixed solution was emulsified at high speed in an emulsifier for 20 min to obtain emulsion c; emulsion c was added dropwise to a beaker containing 200 mL of tap water under stirring conditions to form a white emulsion, and the stirring was continued for 6 h to completely volatilize the dichloromethane and carbon tetrachloride at a stirring temperature of 50°C to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged, and dried to obtain LiNO3·3H2O / polyamide microcapsule powder.

[0041] (2) Blending and granulation: 1 g of the LiNO3·3H2O / polyamide microcapsule powder prepared in step (1) was granulated with 200 g of polyamide particles through a screw extruder to achieve blending and prepare polyamide particles containing microcapsules.

[0042] (3) Melt spinning and fabric preparation: The polyamide particles containing microcapsules obtained in step (2) are spun through a melt spinning machine, and the silk threads are woven into fabric, which is a warm nylon fabric.

[0043] Comparative Example A

[0044] In contrast to Example 1, in this example, the type of core material was changed, that is, "0.1 g LiNO 3 · 3H 2 O" in step (1) was replaced with "0.1 g NaNO 3 ", and the other preparation methods were implemented according to the preparation method of Example 1.

[0045] Comparative Example B

[0046] In contrast to Example 1, in this example, the type of solvent was changed, that is, "225 mL of carbon tetrachloride" in step (1) was replaced with "225 mL of ethanol", and the other preparation methods were implemented according to the preparation method of Example 1.

[0047] Comparative Example C

[0048] In contrast to Example 1, in this example, the amount of microcapsules used was changed, i.e., "1 g of the LiNO3·3H2O / polyamide microcapsule powder prepared in step (1)" in step (2) was changed to "0.01 g of the LiNO3·3H2O / polyamide microcapsule powder prepared in step (1)", and the other preparation methods were implemented according to the preparation method of Example 1.

[0049] Air permeability test:

[0050] To better examine the air permeability of the nylon fabrics prepared in the present invention, nylon fabrics a, b, c, d, e, and f, prepared in Examples 1-3 and Comparative Examples A-C, and unfinished nylon fabrics (purchased from Yongji Knitting Co., Ltd., Keqiao District, Shaoxing City) were selected. Air permeability was tested according to GB / T5453-1997, with specimen dimensions of 20 mm x 22 mm and a pressure of 100 Pa. The test temperature was (20 ± 2)°C and the humidity was (65 ± 2)%. The test principle is to measure the airflow rate vertically through a given area of ​​the specimen under a specified pressure differential over a specified period of time. The air permeability R is calculated as follows:

[0051]

[0052] Where qv is the average airflow rate, A is the test area, and 167 is the conversion factor. The fabrics were washed according to the standard washing method in GB / T 20944.1-2007. The air permeability of the initial sample and the sample after 10 washes were tested. The test results are shown in Table 1.

[0053] Table 1 Air permeability of nylon fabrics a, b, c, d, e, f and unfinished nylon fabrics

[0054]

[0055] As shown in Table 1, the air permeabilities of nylon fabrics a, b, and c ranged from 749.8 to 768.4 mm / s, respectively, slightly lower than those of untreated nylon fabrics and within the normal range. After 10 washes, the air permeabilities of fabrics a, b, and c did not significantly increase. This indicates that the nylon fabrics prepared according to the present invention possess excellent air permeability. Nylon fabrics d, e, and f prepared in Comparative Examples AC also exhibited good air permeability, demonstrating that the type of core material, solvent, and microcapsule dosage have little effect on the air permeability of nylon fabrics.

[0056] Warmth test:

[0057] In order to better test the warmth retention of the nylon fabric prepared in the present invention, the nylon fabrics a, b, c, d, e, f and unfinished nylon fabrics (purchased from Yongji Knitting Co., Ltd., Keqiao District, Shaoxing City) prepared in the above-mentioned specific examples 1 to 3 and comparative examples A to C were selected; the amount of the fabric selected was 300 g / m 2 . The warmth retention of the material was tested in accordance with GB / T11048-2008-T "Determination of thermal and moisture resistance of textiles under steady-state conditions for physiological comfort". Before the test, the sample was pre-humidified and conditioned in accordance with GB6529-86 "Standard for atmospheric environment of constant temperature and humidity chamber". The sample was conditioned in a constant temperature and humidity chamber for 24 hours, with a temperature of (20±2)°C and a humidity of (65±2)%. The sample size was 300mm×300mm, and the preheating time was 15 minutes. The fabric to be tested was subjected to standard washing according to the washing method of the washing color fastness tester GB / T20944.1-2007, and the warmth retention performance of the initial sample and the sample after washing 10 times was tested. The test results are shown in Table 2.

[0058] Table 2 Thermal insulation properties of nylon fabrics a, b, c, d, e, f and unfinished nylon fabrics

[0059]

[0060] As shown in Table 2, the Kroger values ​​of nylon fabrics a, b, and c range from 0.95 to 0.98, respectively, which are higher than those of untreated nylon fabrics. Even after 10 washes, the Kroger values ​​of fabrics a, b, and c remained unchanged. The higher the Kroger value, the better the warmth retention of the fabric. Therefore, it can be concluded that the nylon fabrics prepared in this invention possess excellent warmth retention. The warmth retention of nylon fabrics d, e, and f prepared in Comparative Examples AC is slightly inferior to that of fabrics a, b, and c, indicating that the type of core material, solvent, and microcapsule dosage all have a significant impact on the warmth retention of nylon fabrics.

[0061] Comprehensive analysis shows that the nylon fabric prepared by the present invention has good thermal insulation performance without affecting the air permeability.

Claims

1. A method for preparing a warm nylon fabric, characterized in that: The preparation method comprises the following steps: Preparation of LiNO3·3H2O / polyamide microcapsule powder: polyamide is dissolved in a mixed solvent of dichloromethane and carbon tetrachloride to form solution a; LiNO3·3H2O and an emulsifier, Span 60, are dissolved in water to form solution b; solution b is added dropwise to solution a under stirring to obtain a mixed solution; the mixed solution is emulsified at high speed in an emulsifier to obtain emulsion c; emulsion c is added dropwise to a beaker of tap water under stirring to form a white emulsion, which is continuously stirred to completely volatilize the dichloromethane and carbon tetrachloride to obtain emulsion d containing microcapsules; emulsion d is washed with ethanol, centrifuged, and dried to obtain LiNO3·3H2O / polyamide microcapsule powder; Blending and granulation: the LiNO3·3H2O / polyamide microcapsule powder prepared in step (1) is granulated with polyamide particles through a screw extruder to achieve blending and prepare polyamide particles containing microcapsules; Melt spinning and fabric preparation: The polyamide particles containing microcapsules obtained in step (2) are spun through a melt spinning machine, and the silk threads are woven into fabric, which is a warm nylon fabric.

2. The method for preparing a warm nylon fabric according to claim 1, characterized in that: The dosage ratio of LiNO3·3H2O, emulsifier Span 60 and water in step (1) is 1g: (0.1-0.3)g: (100-200)mL.

3. The method for preparing a warm nylon fabric according to claim 1, characterized in that: The ratio of dichloromethane to carbon tetrachloride in the mixed solvent in step (1) is 1 mL: (2-4) mL; the ratio of the polyamide to the mixed solvent of dichloromethane and carbon tetrachloride is 1 g: (20-40) mL.

4. The method for preparing a warm nylon fabric according to claim 1, characterized in that: The solution b in step (1) is added dropwise to the solution a for 30 to 60 minutes; the dosage ratio of the solution b to the solution a is 1 mL: (5 to 7) mL.

5. The method for preparing a warm nylon fabric according to claim 1, characterized in that: The time for high-speed emulsification of the mixed solution in step (1) in the emulsifier is 10 to 20 minutes.

6. The method for preparing a warm nylon fabric according to claim 1, characterized in that: The stirring time for the continuous stirring in step (1) to completely volatilize the dichloromethane and carbon tetrachloride is 5 to 6 hours, and the stirring temperature is 40 to 50°C.

7. The method for preparing a warm nylon fabric according to claim 1, characterized in that: In step (2), the ratio of the microcapsule powder prepared in step (1) to the polyamide is 1 g: (100-200) g.

8. A warm nylon fabric, characterized in that: The invention is prepared by the method according to any one of claims 1 to 7.

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