Heat preservation cup capable of improving heat preservation effect and preparation method of heat preservation cup

Abstract

The invention relates to a vacuum cup capable of improving the heat preservation effect and a preparation method thereof.The vacuum cup capable of improving the heat preservation effect comprises a shell and a heat preservation inner container, the heat preservation inner container comprises a heat preservation coating of an inner container body, and the heat preservation coating is formed by coating the outer surface of the inner container body with heat preservation paint; the thermal insulation coating comprises the following components in parts by mass: 50-70 parts of waterborne polyurethane, 32-42 parts of a graphene oxide epoxy resin compound, 9-11 parts of an infrared material, 2-4 parts of a defoaming agent, 2-4 parts of a dispersing agent and 1-3 parts of a flatting agent, the graphene oxide epoxy resin composite component is prepared from modified graphene oxide, octa-amino polyhedral oligomeric silsesquioxane and epoxy resin. The vacuum cup has the effect of improving the heat preservation performance of the vacuum cup.

Description

Technical Field

[0001] The present application relates to the field of thermos cups, and in particular to a thermos cup with improved heat preservation effect and a preparation method thereof. Background Art

[0002] A thermos cup is a water container generally made of ceramic or stainless steel with a vacuum layer. It has a lid on the top and is tightly sealed to achieve the effect of keeping warm.

[0003] There is a vacuum structure between the inner liner of the thermos bottle and the outer shell for further insulation, thereby improving the thermal insulation performance of the thermos bottle. However, even in a vacuum environment, the inner liner of the thermos bottle will have infrared radiation and other factors that affect the thermal insulation performance of the thermos bottle. At present, with the increasing requirements for the thermal insulation performance of thermos bottles, ordinary thermos bottles are difficult to meet the insulation needs. Summary of the invention

[0004] In order to further improve the heat preservation performance of a thermos cup, the present application provides a thermos cup with improved heat preservation effect and a preparation method thereof.

[0005] The present application provides a thermos cup with improved thermos cup effect and a preparation method thereof, which adopts the following technical solutions: In the first aspect, the present application provides a thermos cup with improved heat preservation effect, which adopts the following technical solution: A thermos cup with improved heat preservation effect comprises an outer shell and a heat preservation liner, wherein the heat preservation liner comprises a heat preservation coating of the liner body, wherein the heat preservation coating is formed by coating the heat preservation coating on the outer surface of the liner body, and the heat preservation coating comprises the following components: 50-70 parts of waterborne polyurethane, 32-42 parts of graphene oxide epoxy resin composite, 9-11 parts of infrared material, 2-4 parts of defoamer, 2-4 parts of dispersant and 1-3 parts of leveling agent; the graphene oxide epoxy resin composite component comprises modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin.

[0006] By adopting the above technical scheme, after a layer of thermal insulation coating is coated on the outer wall of the inner liner of the thermos cup, a layer of thermal insulation coating is formed, and the thermal insulation coating can further insulate the inner liner, thereby improving the overall thermal insulation performance of the thermos cup, wherein the thermal insulation coating is added with a graphene oxide epoxy resin composite, and the modified graphene oxide is an important derivative of graphene materials, and the oxygen-containing groups on the surface make it have good chemical stability, and it has good performance in thermal insulation performance, and after the octaamino cage-type polysilsesquioxane is modified with the modified graphene oxide, the disorder of the graphene oxide can be reduced, and after being combined with the epoxy resin, the prepared graphene oxide epoxy resin composite can have good stability, and the compatibility in the thermal insulation coating is effectively improved, thereby further improving the thermal insulation performance and stability of the prepared thermal insulation material; at the same time, infrared materials are also added to the thermal insulation coating, and the infrared materials can further suppress infrared radiation in a vacuum environment, reduce heat loss, and further improve the thermal insulation effect of the thermos cup.

[0007] Preferably, the modified graphene oxide comprises graphene oxide, lysine and composite silicon dioxide.

[0008] By adopting the above technical scheme, after graphene oxide is modified by lysine, the dispersion performance of graphene oxide can be improved, thereby improving the stability of graphene oxide, and then further modified by silicon dioxide. Silicon dioxide has low thermal conductivity and high temperature resistance, and is also a good thermal insulation material, which can further improve the thermal insulation performance and stability of the prepared modified graphene oxide.

[0009] Preferably, the modified graphene oxide is prepared by the following method: Graphene oxide is mixed with water and ultrasonically treated to obtain a graphene oxide dispersion; lysine is mixed with water and added to the graphene oxide dispersion, stirred for reaction, and dried and ground to obtain lysine-graphene oxide; lysine-graphene oxide and N,N-dimethylformamide are stirred and mixed, and ultrasonically treated to obtain a lysine-graphene oxide dispersion; composite silicon dioxide is added to the lysine-graphene oxide dispersion and ultrasonically treated, followed by stirring for reaction, washing after the reaction, and finally drying and grinding to obtain modified graphene oxide.

[0010] By adopting the above technical scheme, the amino group on the surface of lysine undergoes amidation reaction and ring-opening reaction with the carboxyl group and epoxy group on the surface of graphene oxide, respectively, so that lysine is grafted to the surface of graphene oxide, which improves the dispersion performance of graphene oxide and provides more active sites for graphene oxide, thereby improving the dispersion performance and compatibility of graphene oxide in the system. After silicon dioxide is grafted to the surface of lysine-graphene oxide, the interlamellar spacing of graphene oxide can be further increased, thereby making graphene oxide more stable in the system. At the same time, silicon dioxide has good thermal insulation performance, which can further improve the thermal insulation performance of the thermal insulation coating.

[0011] Preferably, the mass ratio between the lysine-graphene oxide and the composite silicon dioxide is (1.6-1.8):1.

[0012] By adopting the above technical solution, the mass ratio between lysine-graphene oxide and composite silicon dioxide is preferably within the above range, which can further improve the comprehensive performance of the prepared modified graphene oxide.

[0013] Preferably, during the preparation of lysine-graphene oxide, the reaction temperature of lysine and graphene oxide is 85-95°C.

[0014] By adopting the above technical solution, the reaction temperature of lysine-graphene oxide is preferably within the above range, which can further improve the comprehensive performance of the prepared modified graphene oxide.

[0015] Preferably, the composite silica is prepared by the following method: mixing nano-silica with ethanol, adding a silane coupling agent after ultrasonication, continuing ultrasonication to obtain a mixed solution, reacting the mixed solution in an oil bath environment, adding water during the reaction, washing and centrifuging at the end, and drying to obtain the composite silica.

[0016] By adopting the above technical solution, after modifying silica with a silane coupling agent, the compatibility of silica can be further improved, and it can be stably combined with lysine-graphene oxide to improve the stability of the prepared modified graphene oxide.

[0017] Preferably, the graphene oxide epoxy resin composite component is prepared by the following method: The modified graphene oxide is mixed with methanol, and a modified graphene oxide dispersion is obtained after ultrasonic treatment; octaamino cage-type polysilsesquioxane is mixed with formaldehyde, and then added to the modified graphene oxide dispersion, and phosphorus pentoxide is added, stirred to react, centrifuged and the supernatant is removed, washed and dried, and finally added to epoxy resin and stirred to obtain a graphene oxide epoxy resin composite component.

[0018] By adopting the above technical scheme, octaamino cage-type polysilsesquioxane is an inorganic core composed of alternating Si-O connections, which has good thermal stability, mechanical properties and flame retardant properties. After being compounded with modified graphene oxide, it can further improve the overall compatibility of the system. After being combined with epoxy resin, it can effectively improve the overall stability and bonding performance of the prepared graphene oxide epoxy resin component, and enable the prepared environmentally friendly coating to be further combined with the outer shell of the liner body.

[0019] Preferably, the mass ratio of the modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin is 1.3-1.5:1:12.

[0020] By adopting the above technical solution, the mass ratio between the modified graphene oxide, octaamino cage-type polysilsesquioxane and the epoxy resin is preferably within the above range, which can further improve the overall stability of the prepared graphene oxide epoxy resin component.

[0021] Preferably, the infrared material includes any one or more mixtures of yttrium oxide, magnesium fluoride and magnesium oxide.

[0022] By adopting the above technical solution, after the above infrared material is added to the environmentally friendly coating system, the environmentally friendly coating can suppress infrared radiation in a vacuum environment, thereby further reducing the heat loss of the thermos cup, thereby effectively improving the overall thermal insulation performance of the thermos cup.

[0023] In a second aspect, the present application provides a method for preparing a thermos cup with improved heat preservation effect, using the following technical scheme: A method for preparing a thermos cup with improved heat preservation effect, comprising the following steps: The thermal insulation coating is applied to the surface of the inner liner body and dried to form a thermal insulation coating on the surface of the inner liner body to obtain a thermal insulation inner liner. The thermal insulation inner liner and the outer shell are then assembled to prepare a thermos cup.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, a thermal insulation coating is coated on the surface of the inner liner body, so that a thermal insulation coating is formed on the outer surface of the inner liner body. A graphene oxide epoxy resin composite is added to the thermal insulation coating. Modified graphene oxide, as an important derivative of graphene materials, has a good effect in thermal insulation performance. After the surface is modified by octaamino cage-type polysilsesquioxane, the overall compatibility of the system can be further improved. After being combined with epoxy resin, the overall stability and compatibility of the prepared graphene oxide epoxy resin component can be effectively improved, and it can be evenly dispersed in the coating system, thereby improving the overall thermal insulation performance of the thermal insulation coating, thereby further improving the thermal insulation performance of the thermos cup; 2. The amino groups on the surface of lysine undergo amidation reaction and ring-opening reaction with the carboxyl groups and epoxy groups of graphene oxide respectively, thereby grafting lysine onto the surface of graphene oxide, thereby improving the dispersion performance of graphene oxide and providing more active sites for graphene oxide. After modification by silicon dioxide, the interlayer spacing of graphene oxide can be further increased, thereby making graphene oxide more stable in the system; 3. After adding infrared materials to the thermal insulation coating, the environmentally friendly coating can suppress infrared radiation in a vacuum environment, thereby further reducing the heat loss of the thermos cup and further improving the thermal insulation performance of the thermos cup. DETAILED DESCRIPTION

[0025] The present application is further described in detail below with reference to the embodiments: Description of raw materials: All raw materials in the examples can be obtained commercially; in the present application, the silane coupling agent is γ-aminopropyltrimethoxysilane (CAS No.: 13822-56-5).

[0026] Example 1 Preparation of modified graphene oxide: 8.33 g of graphene oxide was mixed with 500 g of ultrapure water, and the mixture was ultrasonically treated for 30 min after stirring to obtain a graphene oxide dispersion. 1.67 g of lysine (CAS No.: 56-87-1) was mixed with 250 g of ultrapure water and stirred, and then added to the graphene oxide dispersion. The mixture was stirred and reacted in a water bath at 85° C. for 30 min. After the reaction, the system was dried in a blast drying oven for 24 h, and lysine-graphene oxide was obtained after grinding. 5 g of nano-silicon dioxide was mixed with ethanol, and 5 g of silane coupling agent was added after ultrasonic treatment for 20 min. The mixture was ultrasonically treated for 20 min to obtain a mixed solution. The mixed solution was reacted in an oil bath at 90° C. for 6 h. During the reaction, 100 ml of deionized water was added. After the reaction, the mixture was washed alternately with ethanol and deionized water for 3 times, then centrifuged, dried in a vacuum oven at 70°C for 12 hours, and ground to obtain composite silicon dioxide; 6.15 g of lysine-graphene oxide was stirred and mixed with 200 g of N,N-dimethylformamide (CAS No.: 68-12-2), and then ultrasonicated for 20 minutes to obtain a lysine-graphene oxide dispersion, 3.85 g of composite silicon dioxide was added to the lysine-graphene oxide dispersion, ultrasonicated for 20 minutes, and then stirred in an oil bath at 80°C for 6 hours. After the reaction, it was washed alternately with anhydrous ethanol and deionized water for 3 times, and finally dried in a vacuum drying oven at 80°C for 12 hours. After grinding, modified graphene oxide was obtained.

[0027] Preparation of graphene oxide epoxy resin composite components: 5.45 g of modified graphene oxide was mixed with 300 mL of methanol, and a modified graphene oxide dispersion was obtained after ultrasonic treatment; 4.2 g of octaamino cage-type polysilsesquioxane (CAS No.: 1708993-28-5) was mixed with 200 mL of formaldehyde, stirred, and ultrasonically treated for 30 minutes, and then the ultrasonicated mixed solution was added to the modified graphene oxide dispersion, and 1.5 g of phosphorus pentoxide was added, and then stirred in a water bath at 60°C for 8 hours, centrifuged after the reaction and the supernatant was removed, and then washed repeatedly with deionized water for 6 times, and then dried in an oven at 60°C for 6 hours, and the dried product was added to the epoxy resin, stirred and dispersed to obtain a graphene oxide epoxy resin composite component.

[0028] Preparation of thermal insulation coating: 50 g of waterborne polyurethane, 32 g of graphene oxide epoxy resin composite, 9 g of infrared material, 2 g of defoaming agent, 2 g of dispersant and 1 g of leveling agent were mixed, and stirred for 6 hours to obtain a thermal insulation coating.

[0029] Prepare the thermos cup: The thermal insulation coating is evenly applied to the surface of the inner liner body by spraying, and then dried at 60°C for 45 minutes to form a thermal insulation coating with a thickness of 0.3 mm on the surface of the inner liner body to obtain a thermal insulation liner. The thermal insulation liner and the outer shell are then assembled to prepare a thermos cup.

[0030] Example 2 Preparation of modified graphene oxide: 8.33 g of graphene oxide was mixed with 500 g of ultrapure water, and the mixture was ultrasonically treated for 30 min after stirring to obtain a graphene oxide dispersion. 1.67 g of lysine was mixed with 250 g of ultrapure water and stirred, and then added to the graphene oxide dispersion. The mixture was stirred and reacted in a water bath at 95° C. for 30 min. After the reaction, the system was dried in a blast drying oven for 24 h, and lysine-graphene oxide was obtained after grinding. 5 g of nano-silicon dioxide was mixed with ethanol, and 5 g of silane coupling agent was added after ultrasonic treatment for 20 min. The mixture was ultrasonically treated for 20 min to obtain a mixed solution. The mixed solution was reacted in an oil bath at 90° C. for 6 h. During the reaction, 100 ml of deionized water was added. water, after the reaction is completed, it is washed alternately with ethanol and deionized water for 3 times, then centrifuged, dried in a vacuum oven at 70°C for 12 hours, and ground to obtain composite silicon dioxide; 6.43g of lysine-graphene oxide and 200g of N,N-dimethylformamide are stirred and mixed, and then ultrasonicated for 20 minutes to obtain a lysine-graphene oxide dispersion, 3.57g of composite silicon dioxide is added to the lysine-graphene oxide dispersion, ultrasonicated for 20 minutes, and then stirred in an oil bath at 80°C for 6 hours. After the reaction, it is washed alternately with anhydrous ethanol and deionized water for 3 times, and finally dried in a vacuum drying oven at 80°C for 12 hours. After grinding, modified graphene oxide is obtained.

[0031] Preparation of graphene oxide epoxy resin composite components: 6.21 g of modified graphene oxide was mixed with 300 mL of methanol and subjected to ultrasonic treatment to obtain a modified graphene oxide dispersion. 4.14 g of octaamino cage-type polysilsesquioxane was mixed with 200 mL of formaldehyde and stirred, followed by ultrasonic treatment for 30 min. The ultrasonicated mixed solution was then added to the modified graphene oxide dispersion, and 1.5 g of phosphorus pentoxide was added. The mixture was stirred and reacted in a water bath at 60°C for 8 h. After the reaction, the mixture was centrifuged and the supernatant was removed. The mixture was then washed repeatedly with deionized water for 6 times, and then dried in an oven at 60°C for 6 h. The dried product was added to epoxy resin, stirred and dispersed to obtain a graphene oxide epoxy resin composite component.

[0032] Preparation of thermal insulation coating: 70 g of waterborne polyurethane, 42 g of graphene oxide epoxy resin composite, 11 g of infrared material, 4 g of defoamer, 4 g of dispersant and 3 g of leveling agent were mixed, and stirred for 6 hours to obtain a thermal insulation coating.

[0033] Prepare the thermos cup: The thermal insulation coating is evenly applied to the surface of the inner liner body by spraying, and then dried at 60°C for 45 minutes to form a thermal insulation coating with a thickness of 0.3 mm on the surface of the inner liner body to obtain a thermal insulation liner. The thermal insulation liner and the outer shell are then assembled to prepare a thermos cup.

[0034] Example 3 Preparation of modified graphene oxide: 8.33 g of graphene oxide was mixed with 500 g of ultrapure water, and the mixture was ultrasonically treated for 30 min after stirring to obtain a graphene oxide dispersion. 1.67 g of lysine was mixed with 250 g of ultrapure water and stirred, and then added to the graphene oxide dispersion. The mixture was stirred and reacted in a water bath at 90° C. for 30 min. After the reaction, the system was dried in a blast drying oven for 24 h, and lysine-graphene oxide was obtained after grinding. 5 g of nano-silicon dioxide was mixed with ethanol, and 5 g of silane coupling agent was added after ultrasonic treatment for 20 min. The mixture was ultrasonically treated for 20 min to obtain a mixed solution. The mixed solution was reacted in an oil bath at 90° C. for 6 h. During the reaction, 100 ml of deionized water was added. After the reaction is completed, the mixture is washed alternately with ethanol and deionized water for 3 times, then centrifuged, dried in a vacuum oven at 70°C for 12 hours, and ground to obtain composite silicon dioxide; 6.3 g of lysine-graphene oxide and 200 g of N,N-dimethylformamide are stirred and mixed, and then ultrasonicated for 20 minutes to obtain a lysine-graphene oxide dispersion, 3.7 g of composite silicon dioxide is added to the lysine-graphene oxide dispersion, ultrasonicated for 20 minutes, and then stirred in an oil bath at 80°C for 6 hours. After the reaction, it is washed alternately with anhydrous ethanol and deionized water for 3 times, and finally dried in a vacuum drying oven at 80°C for 12 hours. After grinding, modified graphene oxide is obtained.

[0035] Preparation of graphene oxide epoxy resin composite components: 5.83 g of modified graphene oxide was mixed with 300 mL of methanol, and a modified graphene oxide dispersion was obtained after ultrasonic treatment; 4.17 g of octaamino cage-type polysilsesquioxane was mixed with 200 mL of formaldehyde, stirred, and ultrasonically treated for 30 minutes, and then the mixed solution after ultrasonication was added to the modified graphene oxide dispersion, and 1.5 g of phosphorus pentoxide was added, and then stirred and reacted in a water bath at 60°C for 8 hours, centrifuged after the reaction and the supernatant was removed, and then washed repeatedly with deionized water for 6 times, and then dried in an oven at 60°C for 6 hours, and the dried product was added to the epoxy resin, stirred and dispersed to obtain a graphene oxide epoxy resin composite component.

[0036] Preparation of thermal insulation coating: 60 g of waterborne polyurethane, 37 g of graphene oxide epoxy resin composite, 10 g of infrared material, 3 g of defoaming agent, 3 g of dispersant and 2 g of leveling agent were mixed, and stirred for 6 hours to obtain a thermal insulation coating.

[0037] Prepare the thermos cup: The thermal insulation coating is evenly applied to the surface of the inner liner body by spraying, and then dried at 60°C for 45 minutes to form a thermal insulation coating with a thickness of 0.3 mm on the surface of the inner liner body to obtain a thermal insulation liner. The thermal insulation liner and the outer shell are then assembled to prepare a thermos cup.

[0038] Example 4 Example 4 is based on Example 3. In Example 4, when preparing modified graphene oxide, the amount of lysine-graphene oxide used is 5.65 g, and the amount of composite silicon dioxide used is 4.35 g.

[0039] Example 5 Example 5 is based on Example 3. In Example 5, when preparing modified graphene oxide, the amount of lysine-graphene oxide used is 6.67 g, and the amount of composite silicon dioxide used is 3.33 g.

[0040] Example 6 Example 6 is based on Example 3. In Example 6, when preparing lysine-graphene oxide, the reaction temperature is 75°C.

[0041] Example 7 Example 7 is based on Example 3. In Example 7, when preparing lysine-graphene oxide, the reaction temperature is 105°C.

[0042] Example 8 Example 8 is based on Example 3. In Example 8, when preparing the graphene oxide epoxy resin composite, 4.68 g of modified graphene oxide, 4.26 g of octaamino cage-type polysilsesquioxane, and 51.06 g of epoxy resin are used.

[0043] Example 9 Example 9 is based on Example 3. In Example 9, when preparing the graphene oxide epoxy resin composite, 6.94 g of modified graphene oxide, 4.08 g of octaamino cage-type polysilsesquioxane, and 48.98 g of epoxy resin are used.

[0044] Example 10 Example 10 is based on Example 3. In Example 10, when preparing modified graphene oxide, lysine-graphene oxide is replaced with ordinary graphene.

[0045] Embodiment 11 Example 11 is based on Example 3. In Example 11, when preparing modified graphene oxide, the composite silicon dioxide is replaced by ordinary nano silicon dioxide.

[0046] Example 12 Example 12 is based on Example 3. In Example 12, when preparing the graphene oxide epoxy resin composite, the modified graphene oxide is replaced with ordinary graphene oxide.

[0047] Embodiment 13 Example 13 is based on Example 3. In Example 13, when preparing the graphene oxide epoxy resin composite, octaamino cage-type polysilsesquioxane is not added.

[0048] Comparative Example 1 Comparative Example 1 is based on Example 3, and the graphene oxide epoxy resin composite in Comparative Example 1 is replaced by a composite prepared by physically mixing modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin.

[0049] Comparative Example 2 Comparative Example 2 is based on Example 3, and in Comparative Example 2, the graphene oxide epoxy resin composite is replaced with ordinary graphene oxide.

[0050] Comparative Example 3 Comparative Example 3 is based on Example 3, and no infrared material is added in Comparative Example 3.

[0051] Performance testing The following performance tests were performed on the samples of Examples 1-13 and Comparative Examples 1-3: (1) Thermal insulation performance test The thermal insulation performance of the thermal insulation coating of each sample was tested. Each sample was tested three times, the average value was taken, and the test results were filled in Table 1.

[0052] (2) Infrared radiation Table 1 Performance test results of Examples 1-13 and Comparative Examples 1-3 Test items Thermal conductivity (W / m·k) Example 1 0.08 Example 2 0.09 Example 3 0.07 Example 4 0.16 Example 5 0.17 Example 6 0.12 Example 7 0.13 Example 8 0.15 Example 9 0.16 Example 10 0.22 Embodiment 11 0.14 Example 12 0.30 Embodiment 13 0.20 Comparative Example 1 0.22 Comparative Example 2 0.38 Comparative Example 3 0.15 As can be seen from Table 1, the thermal insulation coefficients of Examples 1-3 are all 0.09 or less, indicating that the thermos cup prepared in the present application has good thermal insulation performance.

[0053] In Example 4 and Implementation 5, when preparing modified graphene oxide, the mass ratio of lysine-graphene oxide to composite silicon dioxide is not within the range defined in the present application. When the content of lysine-graphene oxide is too little, too much composite silicon dioxide will affect the stability of lysine-graphene oxide and agglomerate, thereby reducing the comprehensive performance of the prepared modified graphene oxide; when the content of lysine-graphene oxide is too much, it is difficult to uniformly graft to the surface of lysine-graphene oxide through a sufficient amount of composite silicon dioxide, and it is difficult to fully destroy the π-π bond of graphene oxide, so lysine-graphene oxide is difficult to be further dispersed, so the performance of the prepared modified graphene oxide is reduced, and therefore, the performance of Example 4 and Example 5 are both reduced.

[0054] In Example 6 and Example 7, when preparing lysine-graphene oxide, the reaction temperature is not within the range defined in the present application. When the reaction temperature is too low, it is difficult to increase the reaction rate of composite silicon dioxide grafted to lysine-graphene oxide, so the interlamellar spacing of graphene oxide is difficult to further increase, affecting the stability of graphene oxide; when the reaction temperature is too high, the reaction rate is too fast, and the structure of the reaction material will change, the interaction force between the lamellae will increase, and the agglomeration phenomenon of graphene oxide will become more serious, so the performance of lysine-graphene is seriously reduced, so the performance of Example 6 and Example 7 are both reduced.

[0055] In Example 8 and Example 9, when preparing the graphene oxide epoxy resin composite, the mass ratio between the modified graphene oxide, the octaamino cage-type polysilsesquioxane and the epoxy resin is not within the range defined in the present application. When the content of the modified graphene oxide is too little, it is difficult to combine with a sufficient amount of octaamino cage-type polysilsesquioxane to further improve the stability of the modified graphene oxide. Therefore, the performance of the prepared graphene oxide epoxy resin composite is reduced. When the content of the modified graphene oxide is too much, the excess modified graphene oxide is difficult to further stably disperse in the resin system, thereby affecting the stability of the graphene oxide resin system and the performance of the thermal insulation coating. Therefore, the performance of Example 8 and Example 9 is reduced.

[0056] In Example 10, lysine-graphene oxide is replaced with ordinary graphene when preparing modified graphene oxide. The dispersion performance of the unmodified graphene oxide is difficult to be further improved, and agglomeration occurs in the system. At the same time, the compatibility is difficult to be further improved, thereby affecting the overall stability of the system. Therefore, the uniformity of the thermal insulation coating is reduced, and the performance of Example 10 is reduced.

[0057] In Example 11, when preparing modified graphene oxide, the composite silica is replaced by ordinary nano-silica. The active sites of ordinary silica that have not been modified by a silane coupling agent are difficult to be further improved, so the grafting effect with graphene oxide is reduced, and the interlayer spacing of graphene oxide is difficult to be further improved, thereby affecting the dispersion performance of graphene oxide, so the performance of Example 11 is reduced.

[0058] In Example 12, the modified graphene oxide is replaced with ordinary graphene oxide. The interlayer spacing of ordinary graphene oxide is not improved and agglomerates occur in the system, so the stability of the system decreases. Therefore, the uniformity of the thermal insulation coating decreases, and the performance of Example 12 decreases.

[0059] In Example 13, no octaamino cage-type polysilsesquioxane was added, and it was difficult to further improve the compatibility of graphene oxide. The performance in the system was reduced. The compatibility of graphene oxide that had not been composite-modified with octaamino cage-type polysilsesquioxane was reduced. At the same time, it was impossible to form a stable cross-linked network with the epoxy resin and octaamino cage-type polysilsesquioxane, and the stability was reduced. Therefore, the performance of Example 13 was reduced.

[0060] In Comparative Example 1, the graphene oxide epoxy resin composite is replaced by a modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin physically mixed to prepare it. The modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin physically mixed alone are difficult to form a stable cross-linked network, and the stability is difficult to further increase, which affects the comprehensive performance of the thermal insulation coating, so the performance of Comparative Example 1 is reduced.

[0061] In Comparative Example 2, the graphene oxide epoxy resin composite is replaced with ordinary graphene oxide. Ordinary graphene oxide alone is difficult to form a stable cross-linking structure in the process of combining octaamino cage-type polysilsesquioxane with epoxy resin, so the stability of the thermal insulation coating is difficult to improve, and thus the performance of Comparative Example 2 is reduced.

[0062] No infrared material is added in Comparative Example 3, and the thermal insulation coating without infrared material has reduced resistance to infrared radiation, so the thermal insulation performance of the thermal insulation coating is reduced, and the thermal insulation performance of Comparative Example 3 is reduced.

[0063] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​the present application. The technical scope of the present application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A thermos cup with improved heat preservation effect, characterized in that: The invention comprises an outer shell and a heat-insulating liner, wherein the heat-insulating liner comprises a heat-insulating coating of the liner body, wherein the heat-insulating coating is formed by coating the heat-insulating coating on the outer surface of the liner body, and the heat-insulating coating comprises the following components: 50-70 parts of waterborne polyurethane, 32-42 parts of graphene oxide epoxy resin composite, 9-11 parts of infrared material, 2-4 parts of defoamer, 2-4 parts of dispersant and 1-3 parts of leveling agent; the graphene oxide epoxy resin composite component comprises modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin.

2. A thermos cup for improving heat preservation effect according to claim 1, characterized in that: The modified graphene oxide comprises graphene oxide, lysine and composite silicon dioxide.

3. A thermos cup for improving heat preservation effect according to claim 2, characterized in that: The modified graphene oxide is prepared by the following method: Graphene oxide is mixed with water and ultrasonically treated to obtain a graphene oxide dispersion; lysine is mixed with water and added to the graphene oxide dispersion, stirred for reaction, and dried and ground to obtain lysine-graphene oxide; lysine-graphene oxide and N,N-dimethylformamide are stirred and mixed, and ultrasonically treated to obtain a lysine-graphene oxide dispersion; composite silicon dioxide is added to the lysine-graphene oxide dispersion and ultrasonically treated, followed by stirring for reaction, washing after the reaction, and finally drying and grinding to obtain modified graphene oxide.

4. A thermos cup for improving heat preservation effect according to claim 3, characterized in that: The mass ratio between the lysine-graphene oxide and the composite silicon dioxide is (1.6-1.8):

1.

5. The thermos cup for improving heat preservation effect according to claim 3, characterized in that: During the preparation of the lysine-graphene oxide, the reaction temperature of lysine and graphene oxide is 85-95°C.

6. The thermos cup for improving heat preservation effect according to claim 3, characterized in that: The composite silicon dioxide is prepared by the following method: mixing nano silicon dioxide with ethanol, adding a silane coupling agent after ultrasonication, continuing ultrasonication to obtain a mixed solution, reacting the mixed solution in an oil bath environment, adding water during the reaction, washing and centrifuging at the end, and drying to obtain the composite silicon dioxide.

7. The thermos cup for improving heat preservation effect according to claim 1, characterized in that: The graphene oxide epoxy resin composite component is prepared by the following method: The modified graphene oxide is mixed with methanol, and a modified graphene oxide dispersion is obtained after ultrasonic treatment; octaamino cage-type polysilsesquioxane is mixed with formaldehyde, and then added to the modified graphene oxide dispersion, and phosphorus pentoxide is added, stirred to react, centrifuged and the supernatant is removed, washed and dried, and finally added to epoxy resin and stirred to obtain a graphene oxide epoxy resin composite component.

8. The thermos cup for improving heat preservation effect according to claim 7, characterized in that: The mass ratio of the modified graphene oxide, octaamino cage-type polysilsesquioxane and epoxy resin is 1.3-1.5:1:

12.

9. The thermos cup for improving heat preservation effect according to claim 1, characterized in that: The infrared material includes any one or more mixtures of yttrium oxide, magnesium fluoride and magnesium oxide.

10. A method for preparing a thermos cup for improving heat preservation effect as claimed in any one of claims 1 to 9, characterized in that: The steps include: The thermal insulation coating is applied to the surface of the inner liner body and dried to form a thermal insulation coating on the surface of the inner liner body to obtain a thermal insulation inner liner. The thermal insulation inner liner and the outer shell are then assembled to prepare a thermos cup.