CN114318860B - Warm-keeping polyester fabric based on tourmaline powder and preparation method thereof - Google Patents

Abstract

The invention relates to a thermal polyester fabric based on tourmaline powder and a preparation method thereof. The thermal polyester fabric can be prepared by the following method: firstly, preparing nano tourmaline powder; secondly, preparing a silane coupling agent KH-570 hydrolysate; thirdly, reacting the silane coupling agent KH-570 hydrolysate with the nano-grade tourmaline powder to prepare a cross-linked modified nano-grade tourmaline powder solution; and finally, putting the polyester fabric into finishing liquid for finishing and drying to obtain the thermal polyester fabric. The air permeability range of the terylene fabric prepared by the invention is 876.1-892.5 mm/s, the Crohn value range is 1.08-1.18, and the terylene fabric prepared by the invention has better heat preservation performance on the premise of not influencing air permeability.

Description

A kind of warm polyester fabric based on tourmaline powder and preparation method thereof

Technical Field

The invention belongs to the technical field of preparation of polyester fabrics, and in particular relates to a tourmaline powder-based thermal insulation polyester fabric and a preparation method thereof.

Background Art

With the rapid development of the times and the huge increase in population, the speed of textile renewal is accelerating, and the multifunctional finishing of textiles to increase their added value has become an inevitable trend. In recent years, the development of textile clothing with excellent thermal insulation performance has received great attention.

The warmth-keeping mechanism of fabrics refers to the performance of clothing fabrics, textiles, etc. in maintaining the body temperature of the person being covered. When the human body is in thermal equilibrium, the comfortable temperature is around 33.4°C. If it exceeds 37.9°C, the human body will feel cold or warm. According to the structural morphology of the fiber, thermal insulation fabrics can be divided into hollow fibers, microfibers, and space fabric fibers. Hollow polyester accounts for the largest proportion of hollow fibers and is also the most widely used in the thermal clothing industry. From filling materials, thermal clothing, thermal pants to special protective clothing and aerospace clothing, the cross-development prospects of hollow polyester with other disciplines in the future are worth looking forward to.

Literature research shows that the thermal insulation performance of polyester fabrics has received widespread attention, such as: China Invention Patent Application No. 201820520803.3 discloses a hydrophobic double hollow thermal insulation polyester filament: The cross-sectional outer contour of the present invention adopts an angled "T"-shaped structure, so that the horizontal edge has an inclined surface, so that water droplets are difficult to adsorb on the surface, thereby better facilitating the rolling and removal of water droplets, etc., to achieve the effect of surface hydrophobicity, and the "T"-shaped structure is extruded and expanded through a spinneret, and the leaves are connected to each other to form three hollow chambers with the inner hollow layer, which has a better thermal insulation effect. At the same time, the cross-sectional outer contour is a hexagonal shape, which makes the fiber fluffiness better. However, the hollowness of this preparation process is difficult to grasp, which may affect the overall fiber wearability.

Tourmaline powder is a powder obtained by mechanically crushing tourmaline ore after removing impurities. Tourmaline powder is used in the textile industry to make environmentally friendly carbon cloth. Ultrafine tourmaline powder is made into ultrafine fibers, which can be made into anti-magnetic, moisture-proof, warm quilts, cotton pads, anti-electromagnetic radiation shirts, vests, insoles, etc. It can also be used in bedrock baths, steam rooms, light wave rooms, sauna facilities and environmentally friendly home decoration. At present, the application of tourmaline powder in the research and development of warm polyester fabrics is a direction with development and application prospects.

Summary of the invention

The purpose of the present invention is to provide a warm-keeping polyester fabric based on tourmaline powder and a preparation method thereof, so as to solve the deficiencies in the prior art. The polyester fabric contains tourmaline powder, which can effectively generate heat under the influence of human body temperature, thereby realizing the warm-keeping function of the polyester fabric.

The purpose of the present invention is to provide a thermal insulation polyester fabric based on tourmaline powder. The thermal insulation cotton fabric can be prepared by the following preparation method: first, preparing nano tourmaline powder; second, preparing a silane coupling agent KH-570 hydrolyzate; third, reacting the silane coupling agent KH-570 hydrolyzate with nano-level tourmaline powder to obtain a cross-linked modified nano-level tourmaline powder solution; finally, putting the polyester fabric into a finishing liquid for finishing, drying, and preparing the thermal insulation polyester fabric.

Another object of the present invention is to provide a method for preparing the above-mentioned tourmaline powder-based thermal insulation polyester fabric, the preparation method comprising the following steps:

(1) Preparation of nano-tourmaline powder: Grind the tourmaline powder to obtain tourmaline powder particles with a particle size of nanometers.

Preferably, the particle size ranges from 500 to 2000 nanometers.

(2) Hydrolysis: At room temperature, dissolve the emulsifier Span 80 in deionized water, stir evenly, add the silane coupling agent KH-570, emulsify, and prepare the silane coupling agent KH-570 hydrolyzate.

Preferably, the usage ratio of the emulsifier Siban 80, the silane coupling agent KH-570 and the deionized water is 1g: (1-2)g: (200-400)mL; the stirring time is 10-20min; and the emulsification time is 10-20min.

(3) Cross-linking reaction: dissolving the hydrolyzate of silane coupling agent KH-570 obtained in step (2) in dimethylformamide to obtain a diluent; adding the nano-scale tourmaline powder obtained in step (1) to the diluent, stirring and reacting, to obtain a cross-linked modified nano-scale tourmaline powder solution.

Preferably, the usage ratio of the KH-570 crosslinking agent hydrolyzate (mL) to dimethylformamide (mL) is 1:10-20; the usage ratio of the nano-level tourmaline powder (g) to the diluent (mL) is 1:100-200.

Preferably, the reaction temperature is 60-80° C., and the reaction time is 3-5 h.

Analysis of the mechanism of action involved in this step: The reaction model of the surface of tourmaline powder particles modified by silane coupling agent KH-570 includes the following steps: 1. Si-X generates Si-OH under the action of water molecules. 2. Dehydration condensation reaction occurs between the hydrolyzed silane coupling agent molecules to generate oligosiloxane with a certain degree of polymerization; 3. Hydrogen bonds are formed between the Si-OH at the end of the oligosiloxane and the Si-OH on the surface of the tourmaline powder particles; 4. When the temperature required for the reaction is reached, dehydration condensation reaction occurs, and the oligosiloxane is grafted to the surface of the tourmaline powder particles.

(4) Preparation of finishing liquid: Dissolve azobisisobutyronitrile in the cross-linked modified nano-scale tourmaline powder solution prepared in step (3), and stir to prepare a finishing liquid.

Preferably, the dosage ratio of the azobisisobutyronitrile to the cross-linked modified nano-scale tourmaline powder solution prepared in step (3) is: 1 g: (100-200) mL.

(5) Finishing: heating the finishing liquid obtained in step (4) to 90-100° C., and immersing the polyester fabric in the finishing liquid for 1-2 hours; taking out the immersed polyester fabric, washing it with a large amount of tap water, and drying it to obtain a warm polyester fabric.

Preferably, the usage ratio of the polyester fabric (g) to the finishing liquid (mL) is 1:20-40.

The relevant mechanism of action of the present invention is that a part of the functional groups in the silane coupling agent KH-570 can react with the polyester fabric, and another part of the functional groups can react with the tourmaline powder to form a strong bond.

The present invention has the following notable features:

(1) Tourmaline powder has a heating function, but there are difficulties in using it on fabrics. The inventor of the present application unexpectedly discovered that the present invention achieves the purpose of attaching tourmaline powder to polyester fabrics, thereby achieving the purpose of the heating and warmth-keeping function of polyester fabrics; this discovery can achieve the attachment of tourmaline powder to the surface of fabrics without damaging polyester fabrics.

(2) The tourmaline powder-containing polyester fabric prepared by the present invention has the characteristics of simple preparation method and wide source of raw materials, and has good application prospects.

(3) The air permeability of the polyester fabric prepared by the present invention ranges from 876.1 to 892.5 mm/s, which is slightly lower than the air permeability of the polyester fabric before finishing and is within the normal range. The Krog value of the polyester fabric prepared by the present invention ranges from 1.08 to 1.18, which is significantly higher than the Krog value of the polyester fabric before finishing; after 10 times of washing, the Krog value of the fabric still does not decrease significantly, which shows that the polyester fabric prepared by the present invention has good thermal insulation performance without affecting the air permeability.

DETAILED DESCRIPTION

Sources of main raw materials: KH-570 crosslinking agent (chemical name: γ-methacryloxypropyltrimethoxysilane) was purchased from Wuhan Hualun Silicone Co., Ltd.; unfinished polyester fabric was purchased from Taizhou Santai Weaving Factory.

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

Example 1

In this embodiment, a warm polyester fabric based on tourmaline powder is prepared by the following method, comprising the following steps:

(1) Preparation of nano-tourmaline powder: Grind the tourmaline powder to obtain tourmaline powder particles with a particle size of 1000 to 2000 nanometers.

(2) Hydrolysis: At room temperature, dissolve 1 g of emulsifier Span 80 in 300 mL of deionized water and stir evenly for 15 min. Add 1.5 g of silane coupling agent KH-570 and emulsify for 15 min to obtain a hydrolyzate of silane coupling agent KH-570.

(3) Cross-linking reaction: Dissolve 10 mL of silane coupling agent KH-570 hydrolyzate in 150 mL of dimethylformamide to prepare a diluent; add 1 g of the nano-scale tourmaline powder prepared in step (1) to 150 mL of the diluent, and stir to react at a reaction temperature of 70° C. for 4 h to obtain a cross-linked modified nano-scale tourmaline powder solution.

(4) Preparation of finishing liquid: Dissolve 1 g of azobisisobutyronitrile in 150 mL of the cross-linked modified nano-scale tourmaline powder solution prepared in step (3), and stir to prepare a finishing liquid.

(5) Finishing: The finishing liquid obtained in step (4) is heated to 95° C., and 10 g of polyester fabric is placed in 300 mL of the finishing liquid and immersed for 1.5 hours; the immersed polyester fabric is taken out and washed with a large amount of tap water, and dried to obtain a warm polyester fabric.

Example 2

In this embodiment, a warm polyester fabric based on tourmaline powder is prepared by the following method, comprising the following steps:

(1) Preparation of nano-tourmaline powder: Grind the tourmaline powder to obtain tourmaline powder particles with a particle size of 500 to 1500 nanometers.

(2) Hydrolysis: At room temperature, dissolve 1 g of emulsifier Span 80 in 200 mL of deionized water and stir evenly for 10 min. Add 1.0 g of silane coupling agent KH-570 and emulsify for 10 min to obtain a hydrolyzate of silane coupling agent KH-570.

(3) Cross-linking reaction: dissolve 10 mL of silane coupling agent KH-570 hydrolyzate in 100 mL of dimethylformamide to prepare a diluent; add 1 g of the nano-scale tourmaline powder prepared in step (1) to 100 mL of the diluent, stir and react at a reaction temperature of 60° C. for 3 h to obtain a cross-linked modified nano-scale tourmaline powder solution.

(4) Preparation of finishing liquid: Dissolve 1 g of azobisisobutyronitrile in 100 mL of the cross-linked modified nano-scale tourmaline powder solution prepared in step (3), and stir to prepare a finishing liquid.

(5) Finishing: The finishing liquid obtained in step (4) is heated to 90° C., and 10 g of polyester fabric is placed in 200 mL of the finishing liquid and immersed for 1.0 hour; the immersed polyester fabric is taken out and washed with a large amount of tap water, and dried to obtain a warm polyester fabric.

Example 3

In this embodiment, a warm polyester fabric based on tourmaline powder is prepared by the following method, comprising the following steps:

(1) Preparation of nano-tourmaline powder: Grind the tourmaline powder to obtain tourmaline powder particles with a particle size of 800 to 2000 nanometers.

(2) Hydrolysis: At room temperature, dissolve 1 g of emulsifier Span 80 in 400 mL of deionized water and stir evenly for 20 min. Add 2 g of silane coupling agent KH-570 and emulsify for 20 min to obtain a hydrolyzate of silane coupling agent KH-570.

(3) Cross-linking reaction: Dissolve 10 mL of silane coupling agent KH-570 hydrolyzate in 200 mL of dimethylformamide to obtain a diluent; add 1 g of the nano-scale tourmaline powder obtained in step (1) to 200 mL of the diluent and stir to react at a reaction temperature of 80° C. for 5 h to obtain a cross-linked modified nano-scale tourmaline powder solution.

(4) Preparation of finishing liquid: Dissolve 1 g of azobisisobutyronitrile in 200 mL of the cross-linked modified nano-scale tourmaline powder solution prepared in step (3), and stir to prepare a finishing liquid.

(5) Finishing: The finishing liquid obtained in step (4) is heated to 100° C., and 10 g of polyester fabric is placed in 400 mL of the finishing liquid and immersed for 2 hours; the immersed polyester fabric is taken out and washed with a large amount of tap water, and dried to obtain a warm polyester fabric.

Comparative Example A

In contrast to Example 1, in this comparative example, the amount of the emulsifier Span 80 was reduced, that is, in step (2), "1 g of emulsifier Span 80" was changed to "0.1 g of emulsifier Span 80", and the other preparation methods were carried out according to the preparation method of Example 1.

Comparative Example B

In contrast to Example 1, in this comparative example, the temperature and time of the cross-linking reaction were reduced, that is, the reaction temperature of step (3) was changed from "70°C and the reaction time of 4 h" to "30°C and the reaction time of 1 h", and the other preparation methods were carried out according to the preparation method of Example 1.

Comparative Example C

In this comparative example, the amount of azobisisobutyronitrile was reduced, that is, "1 g azobisisobutyronitrile" in step (4) was changed to "0.1 g azobisisobutyronitrile", and the other preparation methods were carried out according to the preparation method of Example 1.

Air permeability test:

In order to better detect the air permeability of the polyester fabric prepared in the present invention, the polyester fabrics a, b, c, d, e, f and unfinished polyester fabrics (purchased from Taizhou Santai Weaving Factory) prepared in the above specific examples 1 to 3 and comparative examples A to C of the present invention were selected; the amount of the fabric selected was 300g/ ^m2 . The air permeability was tested according to GB/T5453-1997, the sample size was 20mm×22mm, and the pressure was 100 Pa. 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.

Where: 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/T 20944.1-2007, 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.

Table 1 Air permeability of polyester fabrics a, b, c, d, e, f and unfinished polyester fabrics

As can be seen from Table 1, the air permeability range of polyester fabrics a, b, and c is between 876.1 and 892.5 mm/s, which is slightly lower than the air permeability of unfinished polyester fabrics. 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 polyester fabric prepared by the present invention has good air permeability. The air permeability of polyester fabrics d, e, and f prepared by comparative examples A-C also shows good performance, which shows that the amount of emulsifier Span 80, the temperature and time of the cross-linking reaction, and the amount of azobisisobutyronitrile have little effect on the air permeability of the polyester fabric.

Warmth test:

In order to better test the warmth retention of the polyester fabric prepared in the present invention, the polyester fabrics a, b, c, d, e, f and unfinished polyester fabrics (purchased from Taizhou Santai Weaving Factory) prepared in the above-mentioned specific examples 1 to 3 and comparative examples A to C of the present invention were selected; the amount of the fabric selected was 300g/ ^m2 . The warmth retention of the material was tested according to GB/T11048-2008-T "Determination of thermal resistance and moisture resistance under steady-state conditions for physiological comfort of textiles". Before the test, the sample was pre-humidified and humidified according to 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 fabrics to be tested were subjected to standard washing according to the washing method of the washing color fastness test machine of GB/T20944.1-2007, and the thermal insulation performance of the initial samples and the samples after washing 10 times was tested. The test results are shown in Table 2.

Table 2 Thermal insulation properties of polyester fabrics a, b, c, d, e, f and unfinished polyester fabrics

As can be seen from Table 2, the Kroger values of polyester fabrics a, b, and c are in the range of 1.08 to 1.18, respectively, which are higher than the Kroger values of unfinished polyester 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 polyester fabric prepared by the present invention has good warmth retention performance. The warmth retention performance of polyester fabrics d, e, and f prepared in comparative examples A-C is slightly worse than that of fabrics a, b, and c, which indicates that the amount of emulsifier Span 80, the temperature and time of the cross-linking reaction, and the amount of azobisisobutyronitrile all have an important influence on the warmth retention performance of the polyester fabric.

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

Claims (3)

1. A method for preparing a warm polyester fabric based on tourmaline powder, characterized in that the preparation method comprises the following steps: (1) Preparation of nano tourmaline powder: Grinding the tourmaline powder to obtain tourmaline powder particles with a particle size of nanometers; (2) Hydrolysis: dissolve the emulsifier Span 80 in deionized water at room temperature, stir evenly, add the silane coupling agent KH-570, emulsify, and prepare the silane coupling agent KH-570 hydrolyzate; (3) Cross-linking reaction: dissolving the hydrolyzate of silane coupling agent KH-570 obtained in step (2) in dimethylformamide to obtain a diluent; adding the nano-scale tourmaline powder obtained in step (1) to the diluent, stirring and reacting, to obtain a cross-linked modified nano-scale tourmaline powder solution; (4) Preparation of finishing liquid: dissolving azobisisobutyronitrile in the cross-linked modified nano-scale tourmaline powder solution prepared in step (3), and stirring to prepare a finishing liquid; (5) Finishing: heating the finishing liquid obtained in step (4) to 90-100° C., and immersing the polyester fabric in the finishing liquid for 1-2 hours; taking out the immersed polyester fabric, washing it with a large amount of tap water, and drying it to obtain a warm polyester fabric; The particle size range of step (1) is 500 to 2000 nanometers; In step (2), the ratio of the emulsifier Siban 80, the silane coupling agent KH-570 and the deionized water is 1 g: (1-2) g: (200-400) mL; the stirring time is 10-20 min; the emulsification time is 10-20 min; In step (3), the ratio of the KH-570 crosslinking agent hydrolyzate to dimethylformamide is 1 mL: (10-20) mL; the ratio of the nano-scale tourmaline powder to the diluent is 1 g: (100-200) mL; The reaction temperature in step (3) is 60-80°C and the reaction time is 3-5h; The amount ratio of azobisisobutyronitrile in step (4) to the cross-linked modified nano-scale tourmaline powder solution prepared in step (3) is 1 g: (100-200) mL. 2. The method for preparing a thermal insulation polyester fabric based on tourmaline powder according to claim 1, characterized in that the dosage ratio of the polyester fabric to the finishing liquid in step (5) is 1 g: (20-40) mL. 3. A warm-keeping polyester fabric based on tourmaline powder, characterized in that it is prepared by the method described in any one of claims 1 to 2.