Graphene modified lignocellulose composite clothing textile material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of functional textile materials, in particular to a graphene modified lignocellulose composite clothing textile material and a preparation method and application thereof. The composite material comprises 60 to 80 wt% of a lignocellulose base material, 0.5 to 2 wt% of a graphene oxide modifier and 0.1 to 0.5 wt% of a silane coupling agent interface reinforcing agent. The preparation method comprises the following steps: alkalization pretreatment of lignocellulose, ultrasonic-assisted dispersion of graphene oxide, and hot-pressing induced in-situ reduction. The obtained composite material has high infrared absorptivity (more than or equal to 85%, 8-14 [mu] m wave band), high thermal resistance (increased by 40%) and excellent washing resistance (the performance retention rate gt, 90% after 20 times of washing), and is suitable for manufacturing warm-keeping clothes with an infrared health-care function.

Description

Technical Field

[0001] This application belongs to the field of functional textile materials technology, specifically relating to a graphene-modified lignin-cellulose composite clothing textile material, its preparation method and application, which is particularly suitable for the manufacture of thermal clothing with infrared health care functions. Background Technology

[0002] While traditional lignin-cellulose materials possess natural and environmentally friendly advantages, they also face numerous limitations in practical applications. Their low crystallinity results in a relatively high thermal conductivity (approximately 0.08 W / m·K), insufficient far-infrared emissivity (approximately 65%-70%), and limited moisture absorption and heat generation properties (temperature rise of approximately 1.5-2℃). These shortcomings restrict their application in the field of thermal clothing.

[0003] Meanwhile, most existing graphene textiles employ a pure graphene coating process, which, while improving material performance to some extent, is costly (graphene content > 5wt%), and suffers from reduced air permeability (air permeability decreases by 30%-40%) and poor washability (performance degradation > 50% after 5 washes). These issues pose challenges to the market promotion and consumer acceptance of graphene textiles. Summary of the Invention

[0004] In view of the contradiction between the insufficient functionality of traditional biomass materials and the high cost of graphene in existing technologies, this application aims to provide an environmentally friendly thermal clothing material with long-lasting infrared health care function.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution: A graphene-modified lignin-cellulose composite textile material, comprising the following components: - Lignin cellulose, content 60-80 wt%; - Graphene oxide, content of 0.5-2 wt%; -Silane coupling agent, content of 0.1-0.5wt%.

[0006] The method for preparing the composite material includes: a) Alkaliization pretreatment of lignin cellulose: Treat lignin cellulose with an 8-12% NaOH solution; b) Ultrasonic-assisted dispersion of graphene oxide: Graphene oxide and silane coupling agent were added to pretreated lignin cellulose and ultrasonically dispersed at a frequency of 40 kHz. c) Hot-press induced in-situ reduction: Hot-press molding at 120-150℃ and 8-12MPa for 30-60 minutes to complete the reduction reaction of graphene oxide.

[0007] Compared with the prior art, the beneficial effects of this application include: 1. Constructing a three-dimensional network structure of lignin-graphene improves the overall performance and stability of the material; 2. Infrared absorption rate increased to over 85% (8-14μm band), thermal resistance increased by 40% (ASTM D1518 standard), and water resistance significantly improved (performance retention rate >90% after 20 washes). 3. Excellent dynamic heat retention performance, with a phase change enthalpy of 25 J / g (DSC test), promoting microcirculation (increasing blood flow rate by 15%-20%). 4. The graphene content is reduced by 80% while maintaining excellent performance, with low cost and strong market competitiveness. Detailed Implementation

[0008] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0009] This application provides a graphene-modified lignin-cellulose composite clothing and textile material and its preparation method. Unless otherwise specified, all raw materials used in the following embodiments are commercially available products, and the process parameters can be adjusted within the range described in this application.

[0010] Example 1 80g of lignin-cellulose pulp was treated with 10% NaOH solution for 2 hours, followed by the addition of 1.2g of graphene oxide (sheet size 0.5-2μm) and 0.3g of KH550 silane coupling agent. The mixture was then ultrasonically treated at 50℃ for 1 hour. Fibers with a diameter of 30μm were produced by wet spinning. After hot pressing at 150℃, the far-infrared emissivity was measured to be 87.3%, the thermal conductivity was 0.043 W / m·K, and the performance retention rate after 30 washes was 93.5%.

[0011] Example 2 70g of lignin-cellulose pulp was treated with 8% NaOH solution for 3 hours, followed by the addition of 0.8g of graphene oxide (sheet size 0.5-2μm) and 0.2g of KH550 silane coupling agent. The mixture was then ultrasonically treated at 40℃ for 1.5 hours. Fibers with a diameter of 25μm were produced by wet spinning. After hot pressing at 120℃, the far-infrared emissivity was measured to be 85.6%, the thermal conductivity was 0.048 W / m·K, and the performance retention rate after 20 washes was 91.2%.

[0012] Example 3 75g of lignin-cellulose pulp was treated with 12% NaOH solution for 1.5 hours, followed by the addition of 1.5g of graphene oxide (sheet size 0.5-2μm) and 0.4g of KH550 silane coupling agent. The mixture was then ultrasonically treated at 60℃ for 0.5 hours. Fibers with a diameter of 35μm were produced by wet spinning. After hot pressing at 140℃, the far-infrared emissivity was measured to be 88.1%, the thermal conductivity was 0.045 W / m·K, and the performance retention rate after 25 washes was 92.8%.

[0013] Performance testing The performance of the composite materials obtained in Examples 1-3 above was tested: - Infrared emissivity: measured using an FTIR spectrometer (8-14μm band); - Thermal conductivity: Tested using a thermal conductivity meter (ASTM D1518); - Washability: Performance retention rate is calculated based on washing according to AATCC 135 standard.

[0014] The test results are shown in the table below: ; Results analysis: The composite material described in this application exhibits excellent performance in terms of infrared health care, warmth retention and durability, and is suitable for the manufacture of high-end thermal clothing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below: - Figure 1 This is a schematic diagram of the structure of the composite material in this application; - Figure 2 These are scanning electron microscope (SEM) images comparing the modification process before and after. - Figure 3 The infrared emission performance test curves for the composite material are shown.

[0016] Other embodiments Those skilled in the art can make appropriate adjustments to the raw material ratios and process parameters based on the disclosure of this application, and all such changes fall within the scope of protection of this application. For example, silane coupling agents such as KH560 and KH570 can be selected; the hot pressing temperature can be optimized within the range of 120-150℃.

[0017] Industrial applications The graphene-modified lignin cellulose composite material described in this application can be widely used in fields such as thermal clothing, medical textiles, and sportswear, and has multiple advantages such as environmental protection, health, and economy.

Claims

1. A graphene-modified lignin-cellulose composite textile material, characterized in that, Includes the following components: Lignin cellulose, content 60-80 wt%; Graphene oxide, with a content of 0.5-2 wt%; Silane coupling agent, content of 0.1-0.5wt%.

2. The graphene-modified lignin-cellulose composite clothing and textile material according to claim 1, characterized in that, The graphene oxide is loaded onto the lignin-cellulose matrix via chemical bonding, which includes covalent bonding mediated by silane coupling agents, with a bonding strength ≥5 N / m.

3. A method for preparing the graphene-modified lignin-cellulose composite clothing textile material according to claim 1, characterized in that, Includes the following steps: a) Alkaliization pretreatment of lignin cellulose: Treat lignin cellulose with an 8-12% NaOH solution; b) Ultrasonic-assisted dispersion of graphene oxide: Graphene oxide and silane coupling agent were added to pretreated lignin cellulose and ultrasonically dispersed at a frequency of 40 kHz. c) Hot-press induced in-situ reduction: Hot-press molding at 120-150℃ and 8-12MPa for 30-60 minutes to complete the reduction reaction of graphene oxide.

4. The preparation method according to claim 3, characterized in that, The alkalization treatment in step a) takes 1-3 hours; the ultrasonic treatment in step b) takes 40-60℃ for 0.5-1.5 hours.

5. A thermal garment, characterized in that, A textile layer comprising the graphene-modified lignin-cellulose composite material of claim 1, wherein the basis weight of the textile layer is 80-120 g / m² and the infrared emissivity is ≥85%.

6. The thermal clothing according to claim 5, characterized in that, The composite material has a phase transition enthalpy of 25 J / g (DSC test) and retains >90% of its properties after 20 washes.

7. The graphene-modified lignin-cellulose composite clothing and textile material according to claim 1, characterized in that, The graphene oxide sheets have a size of 0.5-2 μm.

8. The preparation method according to claim 3, characterized in that, The fiber obtained after hot pressing has a diameter of 20-40 μm, a far-infrared emissivity of 85%-90%, and a thermal conductivity of 0.04-0.05 W / m·K.

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