Warm-keeping polyester fabric and preparation method thereof

Abstract

The invention relates to a warm-keeping polyester fabric and a preparation method thereof. The fabric can be prepared by adopting the following method: firstly, preparing Na2SO410H2O / polyester microcapsule powder; then, the Na2SO410H2O / polyester microcapsule powder and polyester particles are blended, and the polyester particles containing the 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 polyester fabric. The air permeability ranges from 823.7 mm / s to 862.8 mm / s, the crow value ranges from 1.03 to 1.07, and it is shown that the polyester fabric prepared through the method has the good heat preservation performance on the premise that the air permeability is not affected.

Description

Technical Field

[0001] This invention belongs to the field of fabric preparation technology, specifically relating to a warm polyester fabric and its preparation method. Background Technology

[0002] With the continuous improvement of living standards and the acceleration of the pace of life, modern people are paying more and more attention to their health. When choosing clothes, they not only consider their color and style, but also their convenience and other functions, such as whether the clothes have excellent warmth retention.

[0003] Thermal insulation materials refer to the raw materials that make up thermal insulation wadding. They are often used in the form of wadding or wadding in clothing, bedding, sleeping bags, etc., and their biggest characteristics are that they are lightweight, fluffy, and warm. The fiber raw materials of new thermal insulation wadding generally contain hollow or highly crimped polyester, acrylic short fibers, and microfibers, which are made into thermal insulation materials through different production processes.

[0004] The function of thermal insulation materials is to enhance or weaken heat dissipation pathways, thereby achieving a relative balance in energy exchange and providing the human body with a warm and comfortable feeling. Especially in low-temperature environments, they can reduce heat loss from the body to a certain extent. Currently, there is not only a strong focus on developing various thermal insulation waddings with good comfort, but also on researching various thermal insulation fibers and developing thermal insulation functional fibers to improve the thermal insulation properties of thermal insulation materials.

[0005] Literature review indicates that the thermal insulation properties of polyester fabrics have received widespread attention. For example, Chinese invention patent application number 201110380484.3 discloses a manufacturing process for hollow polyester microfibers: by increasing the hollowness of the fibers, the amount of stagnant air within the fibers is increased, thereby improving thermal resistance and achieving a thermal insulation effect. However, in this invention, the hollow fibers deform and gradually lose their thermal insulation effect with increasing compression and washing cycles. Therefore, the modification process for the thermal insulation properties of polyester fabrics needs further improvement. Summary of the Invention

[0006] In view of the above-mentioned drawbacks of the existing technology, the purpose of this invention is to provide a warm polyester fabric and its preparation method.

[0007] The purpose of this invention is to provide a warm polyester fabric, which has the characteristics of heat preservation and environmental protection. This fabric can be prepared by the following method: First, Na2SO4•10H2O / polyester microcapsule powder is prepared; then, the Na2SO4•10H2O / polyester microcapsule powder is blended with polyester particles to obtain polyester particles containing microcapsules; finally, the particles are spun using a melt spinning machine to weave the yarn into a fabric, which is the warm polyester fabric.

[0008] The objective of this invention is achieved through the following technical solution: A method for preparing a warm polyester fabric includes the following steps: (1) Preparation of Na2SO4•10H2O / polyester microcapsule powder: Polyester was dissolved in a mixed solvent of carbon tetrachloride and petroleum ether to form solution a; Na2SO4•10H2O and emulsifier Span80 were dissolved in water to form solution b; solution b was added dropwise to solution a under stirring to obtain a mixture; the mixture was emulsified at high speed in an emulsifier to obtain emulsion c; emulsion c was added dropwise to a beaker containing tap water under stirring to form a white emulsion, and the carbon tetrachloride and petroleum ether were continuously stirred to completely evaporate to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged and dried to obtain Na2SO4•10H2O / polyester microcapsule powder.

[0009] Preferably, the mixture is emulsified at high speed in the emulsifier for 5 to 15 minutes.

[0010] Preferably, the ratio of carbon tetrachloride to petroleum ether in the mixed solvent is 1 mL: (1-2) mL.

[0011] Preferably, the ratio of the polyester to the mixed solvent of carbon tetrachloride and petroleum ether is 1 g: (30-50) mL.

[0012] Preferably, the ratio of Na2SO4•10H2O, emulsifier Span80, and water is 1g:(0.2-0.4)g:(120-240)mL.

[0013] Preferably, the time for adding solution a to solution b is 20 to 40 minutes.

[0014] Preferably, the ratio of solution b to solution a is 1 mL : (8-10) mL.

[0015] Preferably, the stirring time for the continuous stirring to allow carbon tetrachloride and petroleum ether to completely evaporate is 6-8 hours, and the stirring temperature is 50-70°C.

[0016] (2) Blending and granulation: The Na2SO4•10H2O / polyester microcapsule powder obtained in step (1) is blended with polyester particles by granulation through a screw extruder to obtain polyester particles containing microcapsules.

[0017] Preferably, the ratio of the microcapsule powder obtained in step (1) to the amount of polyester is 1g:(200-300)g.

[0018] (3) Melt spinning and fabric preparation: The polyester particles containing microcapsules obtained in step (2) are spun by a melt spinning machine, and the yarn is woven into a fabric, which is a warm polyester fabric.

[0019] The method for preparing microcapsules in this invention is the solvent evaporation method. The principle of the solvent evaporation method is to dissolve the core material and wall material in a solvent to form an emulsion, and then evaporate the volatile solvent of the dispersed phase from the emulsion to prepare microcapsules.

[0020] This invention has the following significant features: (1) The present invention uses polyester as the wall material and Na2SO4•10H2O as the core material to prepare Na2SO4•10H2O / polyester microcapsule phase change material by solvent evaporation method.

[0021] (2) Inorganic phase change material Na2SO4•10H2O has advantages such as high latent heat of phase change, non-flammability, and low cost, and it has a promising future in the field of thermal insulation fabrics. However, Na2SO4•10H2O also has disadvantages such as easy solubility in water and easy loss of water. Therefore, it needs to be encapsulated when used. The applicant of this invention unexpectedly discovered that Na2SO4•10H2O can be used as the core material of microcapsule phase change material. When this microcapsule phase change material is applied to polyester fiber, the problem of encapsulation can be overcome very well. Since the wall material of the microcapsule phase change material is polyester, the compatibility between the microcapsule phase change material and polyester particles is very good.

[0022] (3) The raw materials for the warm polyester fabric prepared by the present invention are widely available, the preparation process is simple, and it has a good market promotion prospect.

[0023] (4) The thermal insulation performance of the polyester fabric prepared by the present invention was not significantly weakened after 10 washes, which indicates that the Na2SO4•10H2O / polyester microcapsule phase change material was well sealed and preserved in the fabric and was not leaked.

[0024] (5) The air permeability of the polyester fabric prepared by the present invention ranges from 823.7 to 862.8 mm / s, which is within the normal range. The clo value of the polyester fabric prepared by the present invention ranges from 1.03 to 1.07, which is significantly higher than that of the polyester fabric before finishing. After 10 washes, the clo value of the fabric did not decrease significantly, which indicates that the polyester fabric prepared by the present invention has good warmth retention performance without affecting the air permeability. Detailed Implementation

[0025] The present invention is described in detail below with reference to the embodiments and comparative examples.

[0026] Example 1 In this embodiment, a warm polyester fabric is prepared by the following method, including the following steps: (1) Preparation of Na2SO4•10H2O / polyester microcapsule powder: 10g of polyester was dissolved in a mixed solvent of 160mL carbon tetrachloride and 240mL petroleum ether to form solution a; 1g of Na2SO4•10H2O and 0.3g of emulsifier Span80 were dissolved in 180mL of water to form solution b; 10mL of solution b was added dropwise to 90mL of solution a under stirring conditions for 30min to obtain a mixture; the mixture was emulsified at high speed in an emulsifier for 10min to obtain emulsion c; emulsion c was added dropwise to a beaker containing tap water under stirring conditions to form a white emulsion, and the carbon tetrachloride and petroleum ether were stirred continuously to completely evaporate for 7h at a stirring temperature of 60℃ to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged and dried to obtain Na2SO4•10H2O / polyester microcapsule powder.

[0027] (2) Blending and granulation: 1g of Na2SO4•10H2O / polyester microcapsule powder obtained in step (1) and 250g of polyester particles are granulated by screw extruder to achieve blending and obtain polyester particles containing microcapsules.

[0028] (3) Melt spinning and fabric preparation: The polyester particles containing microcapsules obtained in step (2) are spun by a melt spinning machine, and the yarn is woven into a fabric, which is a warm polyester fabric a.

[0029] Example 2 In this embodiment, a warm polyester fabric is prepared by the following method, including the following steps: (1) Preparation of Na2SO4•10H2O / polyester microcapsule powder: 10g of polyester was dissolved in a mixed solvent of 150mL carbon tetrachloride and 150mL petroleum ether to form solution a; 1g of Na2SO4•10H2O and 0.2g of emulsifier Span80 were dissolved in 120mL of water to form solution b; 10mL of solution b was added dropwise to 80mL of solution a under stirring conditions for 20min to obtain a mixed solution; the mixed solution was emulsified at high speed in an emulsifier for 5min to obtain emulsion c; emulsion c was added dropwise to a beaker containing tap water under stirring conditions to form a white emulsion, and the carbon tetrachloride and petroleum ether were stirred continuously to completely evaporate for 6h at a stirring temperature of 50℃ to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged and dried to obtain Na2SO4•10H2O / polyester microcapsule powder.

[0030] (2) Blending and granulation: 1g of Na2SO4•10H2O / polyester microcapsule powder obtained in step (1) is blended with 200g of polyester particles by screw extruder to obtain polyester particles containing microcapsules.

[0031] (3) Melt spinning and fabric preparation: The polyester particles containing microcapsules obtained in step (2) are spun by a melt spinning machine, and the yarn is woven into a fabric, which is a warm polyester fabric b.

[0032] Example 3 In this embodiment, a warm polyester fabric is prepared by the following method, including the following steps: (1) Preparation of Na2SO4•10H2O / polyester microcapsule powder: 10g of polyester was dissolved in a mixed solvent of 166.7mL carbon tetrachloride and 333.3mL petroleum ether to form solution a; 1g of Na2SO4•10H2O and 0.4g of emulsifier Span80 were dissolved in 240mL of water to form solution b; 10mL of solution b was added dropwise to 100mL of solution a under stirring conditions for 40min to obtain a mixture; the mixture was emulsified at high speed in an emulsifier for 15min to obtain emulsion c; emulsion c was added dropwise to a beaker containing tap water under stirring conditions to form a white emulsion, and the carbon tetrachloride and petroleum ether were stirred continuously to completely evaporate for 8h at a stirring temperature of 70℃ to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged and dried to obtain Na2SO4•10H2O / polyester microcapsule powder.

[0033] (2) Blending and granulation: 1g of Na2SO4•10H2O / polyester microcapsule powder obtained in step (1) is blended with 300g of polyester particles by screw extruder to obtain polyester particles containing microcapsules.

[0034] (3) Melt spinning and fabric preparation: The polyester particles containing microcapsules obtained in step (2) are spun by a melt spinning machine, and the yarn is woven into a fabric, which is a warm polyester fabric c.

[0035] Comparative Example A Compared with Example 1, in this example, the type of core material is changed, that is, "1gNa2SO4•10H2O" in step (1) is changed to "1gNaNO3", and other preparation methods are carried out according to the preparation method of Example 1 to obtain polyester fabric d.

[0036] Comparative Example B Compared with Example 1, in this example, the type of solvent is changed, that is, "160mL carbon tetrachloride" in step (1) is changed to "160mL ethanol", and other preparation methods are carried out according to the preparation method of Example 1 to obtain polyester fabric e.

[0037] Comparative Example C Compared with Example 1, in this example, the amount of microcapsules was changed, that is, "1g of Na2SO4•10H2O / polyester microcapsule powder obtained in step (1)" in step (2) was changed to "0.01g of Na2SO4•10H2O / polyester microcapsule powder obtained in step (1)". Other preparation methods were carried out according to the preparation method of Example 1, and polyester fabric f was obtained.

[0038] Breathability test: To better test the air permeability of the polyester fabric prepared in this invention, polyester fabrics a, b, c, d, e, and f prepared in the specific embodiments 1-3 and comparative examples A-C of this invention, as well as unfinished polyester fabric (purchased from Yongji Knitting & Textile Co., Ltd., Keqiao District, Shaoxing City), were selected; the fabric usage was selected as 300 g / m². 2 The air permeability was tested according to GB / T5453-1997, with a sample size of 20mm × 22mm and a pressure of 100 Pa. The test temperature was (20±2)℃ and the humidity was (65±2)%. The test principle is to measure the airflow rate passing vertically through a given area of ​​the sample within a certain time under specified pressure difference conditions, and calculate the air permeability R according to the following formula.

[0039] ; In the formula: qv The average airflow rate, A The area is the test area, and 167 is the conversion factor. The fabric to be tested was subjected to standard washing according to the washing method of GB / T 20944.1-2007 Test Machine for Color Fastness to Wash. The air permeability of the initial sample and the sample after 10 washes was tested, and the test results are shown in Table 1.

[0040] Table 1. Air permeability of polyester fabrics a, b, c, d, e, f and unfinished polyester fabrics ; As shown in Table 1, the air permeability of polyester fabrics a, b, and c ranges from 823.7 to 862.8 mm / s, which is within the normal range. After 10 washes, the air permeability of fabrics a, b, and c did not increase significantly. Therefore, it can be concluded that the polyester fabric prepared by this invention has good air permeability. The polyester fabrics d, e, and f prepared in comparative example AC also showed good air permeability, indicating that the type of core material, the type of solvent, and the amount of microcapsules have little impact on the air permeability of polyester fabrics.

[0041] Warmth retention test: To better test the warmth retention of the polyester fabric prepared in this invention, polyester fabrics a, b, c, d, e, and f prepared in the specific embodiments 1-3 and comparative examples A-C, as well as unfinished polyester fabric (purchased from Yongji Knitting & Textile Co., Ltd., Keqiao District, Shaoxing City), were selected. The warmth retention of the materials was tested according to GB / T11048-2008-T "Determination of Thermal and Moisture Resistance under Steady-State Conditions for Physiological Comfort of Textiles". Before testing, the samples were pre-conditioned and conditioned according to GB6529-86 "Standard for Atmospheric Environment of Constant Temperature and Humidity Chamber". The samples were conditioned in a constant temperature and humidity chamber for 24 h at a temperature of (20 ± 2) ℃ and a humidity of (65 ± 2)%. The sample size was 300 mm × 300 mm, and the preheating time was 15 minutes. The fabrics were washed according to the standard washing method, and the warmth retention performance of the initial samples and the samples after 10 washes was tested. The test results are shown in Table 2.

[0042] Table 2. Warmth retention properties of polyester fabrics a, b, c, d, e, f, and unfinished polyester fabrics. ; As shown in Table 2, the cloisonné values ​​of polyester fabrics a, b, and c range from 1.03 to 1.07, which are higher than those of untreated polyester fabrics. After 10 washes, the cloisonné values ​​of fabrics a, b, and c did not decrease significantly. A higher cloisonné value indicates better warmth retention. Therefore, it can be concluded that the polyester fabric prepared in this invention has good warmth retention performance. The warmth retention performance of polyester fabrics d, e, and f prepared in Comparative Example AC is slightly worse than that of fabrics a, b, and c. This indicates that the type of core material, the type of solvent, and the amount of microcapsules all have a significant impact on the warmth retention performance of polyester fabrics.

[0043] Breathability is crucial to the comfort of a fabric; a fabric with good warmth retention but poor breathability is unpopular. Comprehensive analysis suggests that the polyester fabric prepared in this invention exhibits good warmth retention without compromising breathability.

Claims

1. A method for preparing a warm polyester fabric, characterized in that, The preparation method includes the following steps: (1) Preparation of Na2SO4•10H2O / polyester microcapsule powder: Polyester was dissolved in a mixed solvent of carbon tetrachloride and petroleum ether to form solution a; Na2SO4•10H2O and emulsifier Span80 were dissolved in water to form solution b; solution b was added dropwise to solution a under stirring to obtain a mixture; the mixture was emulsified at high speed in an emulsifier to obtain emulsion c; emulsion c was added dropwise to a beaker containing tap water under stirring to form a white emulsion, and the carbon tetrachloride and petroleum ether were stirred continuously to completely evaporate to obtain emulsion d containing microcapsules; emulsion d was washed with ethanol, centrifuged and dried to obtain Na2SO4•10H2O / polyester microcapsule powder; (2) Blending and granulation: The Na2SO4•10H2O / polyester microcapsule powder obtained in step (1) is blended with polyester particles by granulation through a screw extruder to obtain polyester particles containing microcapsules. (3) Melt spinning and fabric preparation: The polyester particles containing microcapsules obtained in step (2) are spun by a melt spinning machine, and the yarn is woven into a fabric, which is a warm polyester fabric.

2. The method for preparing a warm polyester fabric according to claim 1, characterized in that, In step (1), the ratio of Na2SO4•10H2O, emulsifier Span80 and water is 1g:(0.2~0.4)g:(120~240)mL.

3. The method for preparing a warm polyester fabric according to claim 1, characterized in that, In step (1), the ratio of carbon tetrachloride to petroleum ether in the mixed solvent is 1 mL: (1-2) mL; the ratio of polyester to the mixed solvent of carbon tetrachloride and petroleum ether is 1 g: (30-50) mL.

4. The method for preparing a warm polyester fabric according to claim 1, characterized in that, In step (1), the time for adding solution a to solution b is 20 to 40 minutes; the ratio of the volume of solution b to solution a is 1 mL: (8 to 10) mL.

5. The method for preparing a warm polyester fabric according to claim 1, characterized in that, The mixture described in step (1) is emulsified at high speed in an emulsifier for 5 to 15 minutes.

6. The method for preparing a warm polyester fabric according to claim 1, characterized in that, The stirring time for continuously stirring in step (1) to allow carbon tetrachloride and petroleum ether to completely evaporate is 6 to 8 hours, and the stirring temperature is 50 to 70°C.

7. The method for preparing a warm polyester fabric according to claim 1, characterized in that, In step (2), the ratio of the microcapsule powder obtained in step (1) to the polyester is 1g:(200-300)g.

8. A warm polyester fabric, characterized in that, It is prepared by the method described in any one of claims 1 to 7.