Graphene-based composite fabric and electric heating tablecloth

Abstract

The application relates to the technical field of fabrics, in particular to a composite fabric based on graphene and an electric heating table cloth, which comprises a base cloth and a coating layer; the coating layer is made of the following raw materials in parts by weight: 100-120 parts of epoxy resin emulsion, 20-30 parts of epoxidized eucommia rubber, 5-10 parts of polyether modified siloxane phosphate, 5-15 parts of graphene, 1-5 parts of carbon nanotube / layered double metal oxide, 20-40 parts of a curing agent and 0-2 parts of an additive; the prepared composite fabric has suitable resistance, moderate and uniform heating temperature and good mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a graphene-based composite fabric and an electrically heated tablecloth. Background Technology

[0002] In winter, due to the low room temperature, food cools down quickly after being served, affecting its taste and giving consumers a poor dining experience. The current solution is to use candles or alcohol to heat the bottom of the plates, which poses certain safety hazards. Frequently adding alcohol or replacing candles also increases the workload of service staff. Ordinary tablecloths are only used to prevent stains or enhance the appearance of the table. If the tablecloth could heat the plates, the above problems would be solved very well. Summary of the Invention

[0003] Purpose of the invention: To address the above-mentioned technical problems, this invention proposes a graphene-based composite fabric and an electrically heated tablecloth.

[0004] The technical solution adopted is as follows:

[0005] A graphene-based composite fabric, comprising a base fabric and a coating;

[0006] The coating is made from the following raw materials in parts by weight:

[0007] 100-120 parts epoxy resin emulsion, 20-30 parts epoxidized Eucommia ulmoides gum, 5-10 parts polyether modified siloxane phosphate, 5-15 parts graphene, 1-5 parts carbon nanotubes / layered bimetallic oxides, 20-40 parts curing agent, and 0-2 parts additives.

[0008] Furthermore, the epoxy resin emulsion has a solid content of ≥50% and an epoxy equivalent of 300-400 g / mol.

[0009] Furthermore, the preparation method of the epoxidized Eucommia ulmoides gum is as follows:

[0010] Add eucommia gum to toluene, heat to 50-60℃, add formic acid and hydrogen peroxide dropwise, react for 2-5 hours, remove toluene by vacuum distillation, wash the obtained product with water and ethanol, dry and pulverize.

[0011] Furthermore, the preparation method of the polyether-modified siloxane phosphate is as follows:

[0012] Heptamethylhydrotrisiloxane and allyl alcohol polyoxyalkyl ether are added to toluene, and nitrogen gas is introduced for protection. Isopropanol chloroplatinate solution is added as a catalyst, and the mixture is heated to 60-80°C. After reacting for 5-10 hours, the mixture is distilled under reduced pressure to remove low-boiling substances and obtain an intermediate. Phosphorus pentoxide is then added to the intermediate, and the mixture is heated to 80-100°C. After reacting for 5-10 hours, the mixture is distilled under reduced pressure to remove low-boiling substances.

[0013] Furthermore, the layered bimetallic oxide is a Mg-Al layered bimetallic oxide.

[0014] Furthermore, the preparation method of the carbon nanotube / layered bimetallic oxide is as follows:

[0015] Soluble magnesium salts and soluble aluminum salts are dissolved in water, and then carbon nanotubes are added. After ultrasonic oscillation and dispersion, sodium hydroxide solution is added dropwise to adjust the pH of the reaction solution to 10-11. The resulting reaction solution is transferred to a hydrothermal reactor, sealed and heated to 120-140℃ for 16-24 hours to obtain the precursor. The precursor is then calcined at 450-650℃ for 2-4 hours.

[0016] Furthermore, the curing agent is any one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, and diethylaminopropylamine.

[0017] Furthermore, the additives include any one or more of dispersants, defoamers, leveling agents, and antioxidants.

[0018] Furthermore, the preparation method of the composite fabric is as follows:

[0019] An impregnation solution is prepared by uniformly mixing epoxy resin emulsion, epoxidized Eucommia ulmoides gum, polyether modified siloxane phosphate, graphene, carbon nanotubes / layered bimetallic oxide, curing agent, and additives. The base fabric is then impregnated in the impregnation solution and dried under vacuum at 40-60℃ for more than 10 hours.

[0020] The present invention also provides an electrically heated tablecloth made of the above-mentioned graphene-based composite fabric.

[0021] The beneficial effects of this invention are:

[0022] This invention provides a graphene-based composite fabric, comprising a base fabric and a coating. Epoxy resin is used as the matrix resin. The introduction of epoxidized Eucommia ulmoides gum not only improves the brittleness of the epoxy resin itself, thus enhancing the toughness and mechanical properties of the coating, but also compensates for the pores generated during the curing process of the epoxy resin, improving film-forming properties. Furthermore, it improves the dispersion of graphene and carbon nanotubes / layered bimetallic oxides, increasing the uniformity of heat release. The residual P-OH in the polyether-modified siloxane phosphate can undergo an addition reaction with the epoxy groups, grafting the polyether segments and Si-O to the... In the resin network, the curing shrinkage rate of the resin matrix is ​​improved, the average distance between graphene and carbon nanotubes / layered bimetallic oxides is reduced, the probability of direct contact between them is increased, and more effective conductive channels are formed, thereby improving the conductivity and exothermic stability. The layered bimetallic oxides effectively overlap and synergistically disperse with the 0-dimensional graphene and 1-dimensional carbon nanotubes, better forming a spatial conductive network, giving the composite system good conductivity. After testing, the composite fabric prepared by this invention has suitable resistance, moderate and uniform heating temperature, and good mechanical properties. Attached Figure Description

[0023] Figure 1 This is a microscopic photograph of the carbon nanotube / Mg-Al layered bimetallic oxide prepared in Example 1. Detailed Implementation

[0024] Unless otherwise specified in the examples, the conditions were performed under standard conditions or as recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products. Techniques not mentioned in this invention refer to existing technologies. Unless otherwise specified, the following examples and comparative examples are parallel experiments, using the same processing steps and parameters.

[0025] Example 1:

[0026] A graphene-based composite fabric comprising a polypropylene base and a coating;

[0027] The coating is made from the following raw materials in parts by weight:

[0028] 110 parts epoxy resin emulsion, 25 parts epoxidized Eucommia ulmoides gum, 8 parts polyether modified siloxane phosphate, 10 parts graphene, 3 parts carbon nanotube / Mg-Al layered bimetallic oxide, and 30 parts triethylenetetramine.

[0029] The epoxy resin emulsion had a solid content of 55±2% and an epoxy equivalent of 380g / mol, and was purchased from Bath Synthetic New Materials (Shenzhen) Co., Ltd.

[0030] The preparation method of epoxidized Eucommia ulmoides gum is as follows:

[0031] Add 20g of Eucommia gum to 200ml of toluene, heat to 60℃, add 10ml of formic acid and 60ml of hydrogen peroxide dropwise, react for 2.5h, remove toluene by vacuum distillation, wash the obtained product with water until neutral, then wash with ethanol, and finally dry and pulverize.

[0032] The preparation method of polyether-modified siloxane phosphate is as follows:

[0033] 22.25 g of heptamethylhydrotrisiloxane and 240 g of allyl alcohol polyoxyalkyl ether were added to 1.5 L of toluene, and nitrogen gas was introduced for protection. 0.5 g of 0.05 M isopropanol chloroplatinic acid solution was added as a catalyst, and the mixture was heated to 80 °C. After reacting for 6 h, the mixture was distilled under reduced pressure to remove low-boiling substances and obtain an intermediate. 4.75 g of phosphorus pentoxide was then added to the intermediate, and the mixture was heated to 85 °C. After reacting for 6 h, the mixture was distilled under reduced pressure to remove low-boiling substances.

[0034] The preparation method of carbon nanotube / Mg-Al layered bimetallic oxide is as follows:

[0035] Dissolve 46.08g magnesium nitrate hexahydrate and 22.5g aluminum nitrate nonahydrate in 800ml of water, then add 8g carbon nanotubes. After ultrasonic oscillation and dispersion for 30min, add 1.5M sodium hydroxide solution dropwise to adjust the pH of the reaction solution to 10. Transfer the resulting reaction solution to a hydrothermal reactor, seal and heat to 120℃ for 24h to obtain the precursor. Place the precursor in a muffle furnace and calcine at 600℃ for 4h.

[0036] The preparation method of the above-mentioned composite fabric is as follows:

[0037] An impregnation solution was prepared by uniformly mixing epoxy resin emulsion, epoxidized Eucommia ulmoides gum, polyether modified siloxane phosphate, graphene, carbon nanotube / Mg-Al layered bimetallic oxide, and triethylenetetramine. The base fabric was then immersed in the impregnation solution three times and rolled three times, with a bath ratio of 1:50, an impregnation time of 20 minutes, and a roll-off rate of 80%. The fabric was then placed in a drying oven and vacuum dried at 50°C for 15 hours.

[0038] Example 2:

[0039] The process is essentially the same as in Example 1, except that, by weight, the coating is made from the following raw materials:

[0040] 120 parts epoxy resin emulsion, 30 parts epoxidized Eucommia ulmoides gum, 10 parts polyether modified siloxane phosphate, 15 parts graphene, 5 parts carbon nanotube / Mg-Al layered bimetallic oxide, and 40 parts triethylenetetramine.

[0041] Example 3:

[0042] The process is essentially the same as in Example 1, except that, by weight, the coating is made from the following raw materials:

[0043] 100 parts epoxy resin emulsion, 20 parts epoxidized Eucommia ulmoides gum, 5 parts polyether modified siloxane phosphate, 5 parts graphene, 1 part carbon nanotube / Mg-Al layered bimetallic oxide, and 20 parts triethylenetetramine.

[0044] Comparative Example 1:

[0045] It is basically the same as Example 1, except that epoxidized Eucommia gum is not added.

[0046] Comparative Example 2:

[0047] It is basically the same as Example 1, except that polyether-modified siloxane phosphate is not added.

[0048] Comparative Example 3:

[0049] It is basically the same as Example 1, except that carbon nanotubes / Mg-Al layered bimetallic oxide is not added.

[0050] Performance testing:

[0051] The composite fabrics prepared in Examples 1-3 and Comparative Examples 1-3 of the present invention were used as samples for performance testing.

[0052] ① The sheet resistance of the sample was measured using a Kunde KDY-1A four-probe resistivity meter, and the sample thickness was measured using an electronic digital micrometer. The volume resistivity ρ = R s ×t, Rs is the sheet resistance of the sample, and t is the thickness of the sample.

[0053] ② Take a sample (10cm×10cm), connect it to the circuit and turn on the power. After the voltage stabilizes at 6V, after 60 minutes of power-on, measure the temperature of the sample at each of the four corners and the center using an Agilent 34970A data acquisition instrument with an external thermocouple.

[0054] ③ Determine the elongation at break and the breaking time according to GB / T 3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method)". Measure each sample 3 times and take the average value.

[0055] The test results are shown in Table 1 below:

[0056] Table 1:

[0057]

[0058] As shown in Table 1 above, the composite fabric prepared by the present invention has suitable resistance, moderate and uniform heating temperature, and good mechanical properties.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A graphene-based composite fabric, characterized in that, It includes a base fabric and a coating; the coating is made from the following raw materials in parts by weight: 100-120 parts epoxy resin emulsion, 20-30 parts epoxidized Eucommia ulmoides gum, 5-10 parts polyether modified siloxane phosphate, 5-15 parts graphene, 1-5 parts carbon nanotubes / layered bimetallic oxide, 20-40 parts curing agent, and 0-2 parts additives. The preparation method of the epoxidized Eucommia ulmoides gum is as follows: Add eucommia gum to toluene, heat to 50-60℃, add formic acid and hydrogen peroxide dropwise, react for 2-5 hours, remove toluene by vacuum distillation, wash the obtained product with water and ethanol, dry and pulverize. The preparation method of the polyether-modified siloxane phosphate is as follows: Heptamethylhydrotrisiloxane and allyl alcohol polyoxyalkyl ether are added to toluene, nitrogen gas is introduced for protection, isopropanol chloroplatinate solution is added as catalyst, heated to 60-80℃, reacted for 5-10 hours, and then distilled under reduced pressure to remove low-boiling substances to obtain an intermediate. Phosphorus pentoxide is then added to the intermediate, heated to 80-100℃, reacted for 5-10 hours, and then distilled under reduced pressure to remove low-boiling substances. The layered bimetallic oxide is a Mg-Al layered bimetallic oxide; The preparation method of the carbon nanotube / layered bimetallic oxide is as follows: Soluble magnesium salt and soluble aluminum salt are dissolved in water, and then carbon nanotubes are added. After ultrasonic oscillation and dispersion, sodium hydroxide solution is added dropwise to adjust the pH of the reaction solution to 10-11. The resulting reaction solution is transferred to a hydrothermal reactor, sealed and heated to 120-140℃ for 16-24 hours to obtain the precursor. The precursor is then calcined at 450-650℃ for 2-4 hours. The epoxy resin emulsion has a solid content of ≥50% and an epoxy equivalent of 300-400 g / mol; The curing agent is any one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, and diethylaminopropylamine; The additives include any one or more of dispersants, defoamers, leveling agents, and antioxidants; The method for preparing the composite fabric is as follows: An impregnation solution is prepared by uniformly mixing epoxy resin emulsion, epoxidized Eucommia ulmoides gum, polyether modified siloxane phosphate, graphene, carbon nanotubes / layered bimetallic oxide, curing agent, and additives. The base fabric is then impregnated in the impregnation solution and dried under vacuum at 40-60℃ for more than 10 hours.

2. An electrically heated tablecloth, characterized in that, Made from the graphene-based composite fabric as described in claim 1.

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