Warm-keeping chinlon fabric and preparation method thereof

Abstract

The invention relates to a warm-keeping chinlon fabric and a preparation method thereof. The fabric can be prepared by adopting the following method: firstly, preparing LiNO3. 3H2O / polyamide microcapsule powder; then, the LiNO3. 3H2O / polyamide microcapsule powder and polyamide particles are blended, and the polyamide particles containing microcapsules are prepared; finally, spinning is conducted through a melt spinning machine, the silk threads are woven into the fabric, and the fabric is the warm-keeping chinlon fabric. The air permeability range of the chinlon fabric prepared by the method is 749.8-768.4 mm / s, and the Crow value range of the chinlon fabric is 0.95-0.98, which indicates that the chinlon fabric prepared by the method has better thermal insulation performance on the premise of not influencing the air permeability.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric preparation, and in particular relates to a warm 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 on clothing, and they are more advocating and pursuing warmth, comfort and health. In this form, preparing textile fabrics with excellent warmth retention performance is one of the research and development directions.

[0003] Nylon is a fiber obtained by cutting polyamide into filaments, and polyamide is referred to as PA. Although the fabrics woven with nylon have excellent strength, low density, light fabric, good elasticity, fatigue resistance, good chemical stability, alkali resistance but not acid resistance, the traditional nylon fiber has poor thermal insulation and breathability, so it is necessary to improve the existing nylon. There are many types of thermal insulation fibers on the market. The thermal insulation fibers on the market mainly achieve the effect of heating and warmth by reducing the heat lost by the human body through heat conduction, heat convection and heat radiation, or by utilizing the energy in the environment through physical and chemical changes.

[0004] Literature research shows that the thermal insulation performance of nylon fabrics has received widespread attention. For example, China Invention Patent Application No. 201110380484.3 discloses a manufacturing process for polyester hollow micro-denier fibers: by increasing the hollowness of the fibers to increase the amount of static air in the fibers, improve thermal resistance, and achieve a warming effect. However, as the number of extrusions and washings in the invention increases, the hollow fibers may deform and gradually lose their warming effect. China Invention Patent Application No. 201520870829.7 discloses a preparation process for warm and breathable nylon fibers: the fiber includes a fiber body with a circular cross-section, a cavity for air circulation is provided in the body, thermal insulation particles are embedded in the fiber body, a protrusion is provided on the outer surface of the fiber body, and a photocatalyst layer is coated on the outer surface of the protrusion; the cavity includes a cross-shaped cavity in the center of the cavity, and the end of the cross-shaped cavity is connected to an arc-shaped cavity, and two adjacent arc-shaped cavities are not connected. However, the friction between the patented fibers may increase the temperature, causing static electricity between the nylon fibers, resulting in discharge when people or objects come into contact, which is harmful to the human body and even causes electric shock to the human body. Therefore, it is of great significance to study a nylon fabric with excellent heating and warmth retention functions. Summary of the invention

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

[0006] The purpose 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 obtain polyamide particles containing microcapsules; finally, spinning is carried out by a melt spinning machine to weave the silk threads 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 containing tap water under stirring conditions to form a white emulsion, and the dichloromethane and carbon tetrachloride are continuously stirred to completely volatilize 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 usage 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 by a screw extruder to achieve blending and prepare polyamide particles containing microcapsules.

[0018] Preferably, the ratio of the microcapsule powder obtained 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 fabrics, which are warm nylon fabrics.

[0020] The method for preparing microcapsules of the present invention is a solvent volatilization method. The principle of the solvent volatilization method is that the core material and the wall material are dissolved in a solvent to form an emulsion, and then the dispersed phase volatile solvent is volatilized 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 a good inorganic phase change material with heat energy storage and temperature control functions; however, it has the problem of poor compatibility when used in nylon fabrics. The applicant of the present invention unexpectedly discovered that by preparing it as a LiNO3·3H2O / polyamide microcapsule phase change material, the wall material of the microcapsule is polyamide, so the microcapsule can well solve the problem of poor compatibility between LiNO3·3H2O and polyamide fiber.

[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 being washed 10 times, 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 fabric prepared by the present invention ranges from 749.8 to 768.4 mm / s, which is slightly lower than the air permeability of the nylon fabric before finishing, and the air permeability is within the normal range. The Krog value of the nylon fabric prepared by the present invention ranges from 0.95 to 0.98, which is significantly higher than the Krog value of the nylon fabric before finishing; after 10 times of washing, the Krog value of the fabric still does not decrease significantly, which shows that the nylon fabric prepared by the present invention has good thermal insulation performance without affecting the 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, comprising the following steps:

[0030] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: 10 g polyamide was dissolved in a mixed solvent of 75 mL dichloromethane and 225 mL carbon tetrachloride to form solution a; 0.1 g LiNO3·3H2O and 0.02 g emulsifier Span 60 were dissolved in 15 mL water to form solution b; 10 mL solution b was added dropwise to 60 mL 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 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) and 150 g of polyamide particles were granulated by 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 fabrics, which are warm nylon fabrics.

[0033] Example 2

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

[0035] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: 10 g polyamide was dissolved in a mixed solvent of 66 mL dichloromethane and 134 mL carbon tetrachloride to form solution a; 0.1 g LiNO3·3H2O and 0.01 g emulsifier Span 60 were dissolved in 10 mL water to form solution b; 10 mL solution b was added dropwise to 50 mL solution a under stirring conditions to obtain a mixed solution; the mixed solution was emulsified at high speed for 10 min in an emulsifier to obtain emulsion c; emulsion c was added dropwise to a beaker containing 200 mL tap water under stirring conditions to form a white emulsion, and the mixture was stirred continuously to completely volatilize the dichloromethane and carbon tetrachloride for 5 h at a stirring temperature of 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) and 100 g of polyamide particles are granulated by 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 fabrics, which are warm nylon fabrics.

[0038] Example 3

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

[0040] (1) Preparation of LiNO3·3H2O / polyamide microcapsule powder: 10 g polyamide was dissolved in a mixed solvent of 80 mL dichloromethane and 320 mL carbon tetrachloride to form solution a; 0.1 g LiNO3·3H2O and 0.03 emulsifier Span 60 were dissolved in 20 mL water to form solution b; 10 mL solution b was added dropwise to 70 mL solution a under stirring conditions to obtain a mixed solution; the mixed solution was emulsified at high speed for 20 min in an emulsifier to obtain emulsion c; emulsion c was added dropwise to a beaker containing 200 mL tap water under stirring conditions to form a white emulsion, and the dichloromethane and carbon tetrachloride were continuously stirred for 6 h to completely volatilize, and the stirring time was 6 h and the stirring temperature was 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) and 200 g of polyamide particles were granulated by 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 fabrics, which are warm nylon fabrics.

[0043] Comparative Example A

[0044] In contrast to Example 1, in this example, the type of core material is changed, that is, "0.1 g LiNO3·3H2O" in step (1) is replaced with "0.1 g NaNO3", and the other preparation methods are 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] Taking Example 1 as a comparison, in this example, the amount of microcapsules used is changed, that is, the "1g of LiNO3·3H2O / polyamide microcapsule powder prepared in step (1)" in step (2) is changed to "0.01g of LiNO3·3H2O / polyamide microcapsule powder prepared in step (1)", and the other preparation methods are implemented according to the preparation method of Example 1.

[0049] Air permeability test:

[0050] In order to better detect the air permeability 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 specific examples 1 to 3 and comparative examples A to C of the present invention were selected. The air permeability was tested according to GB / T5453-1997, the sample size was 20mm×22mm, and the pressure was 100Pa. The test temperature was (20±2)℃, and the humidity was (65±2)%. The test principle is to measure the air flow rate vertically passing through a given area of ​​the sample within a certain period of time under the specified pressure difference conditions, and calculate the air permeability R according to the following formula.

[0051]

[0052] In the formula: qv is the average air flow, A is the test area, and 167 is the conversion factor. The fabric to be tested was washed in a standard manner according to the washing method of GB / T20944.1-2007 color fastness test machine, and the air permeability of the initial sample and the sample after washing 10 times was 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 can be seen from Table 1, the air permeability ranges of nylon fabrics a, b, and c are between 749.8 and 768.4 mm / s, respectively, which are slightly lower than the air permeability of unfinished nylon fabrics, and the air permeability is within the normal range; after 10 times of washing, the air permeability of fabrics a, b, and c did not increase significantly. It can be considered that the nylon fabric prepared by the present invention has good air permeability. The air permeability of nylon fabrics d, e, and f prepared by comparative examples AC also shows good performance, which shows that the type of core material, the type of solvent, and the amount of microcapsules used have little effect on the air permeability of nylon fabrics.

[0056] Warmth test:

[0057] In order to better detect the warmth retention of the nylon fabric prepared in the present invention, nylon fabrics a, b, c, d, e, f and unfinished nylon fabrics (purchased from Shaoxing Keqiao Yongji Knitting Co., Ltd.) prepared in the above-mentioned specific embodiments 1 to 3 and comparative examples A to C of the present invention were selected; the amount of the selected fabric was 300 g / m 2 . The warmth retention of the material was tested in accordance with GB / T11048-2008-T "Determination of thermal resistance and moisture resistance of textiles under steady-state conditions for physiological comfort". Before the test, the sample was pre-humidified and humidified in accordance with GB6529-86 "Standard for atmospheric environment of constant temperature and humidity chamber". The sample was humidified in a constant temperature and humidity chamber for 24 hours, with a temperature of (20±2)℃ 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 washed in a standard manner according to the washing method of the washing color fastness test machine of 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 can be seen from Table 2, the Kroger values ​​of nylon fabrics a, b, and c are in the range of 0.95 to 0.98, respectively, which are higher than the Kroger values ​​of unfinished nylon fabrics; after 10 times of washing, the Kroger values ​​of fabrics a, b, and c still do not decrease significantly. The higher the Kroger value, the better the warmth retention of the fabric. It can be considered that the nylon fabric prepared by the present invention has good warmth retention performance. The warmth retention performance of nylon fabrics d, e, and f prepared by comparative examples AC is slightly worse than that of fabrics a, b, and c, which indicates that the type of core material, the type of solvent, and the amount of microcapsules used all have an important influence on the warmth retention performance 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: (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 volatilize to obtain emulsion d containing microcapsules; emulsion d is washed with ethanol, centrifuged, and dried to obtain LiNO3·3H2O / polyamide microcapsule powder; (2) Blending and granulation: The LiNO3·3H2O / polyamide microcapsule powder prepared in step (1) is granulated with polyamide particles by a screw extruder to achieve blending and prepare polyamide particles containing microcapsules; (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 fabrics, which are warm nylon fabrics.

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 1 g: (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 usage ratio of dichloromethane and carbon tetrachloride in the mixed solvent in step (1) is 1 mL: (2-4) mL; the usage 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 time for adding solution a to solution b in step (1) is 30 to 60 minutes; the dosage ratio of solution b to 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 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 obtained in step (1) to the polyamide is 1g: (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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