Layered thermal insulation material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of thermal insulation materials, and particularly relates to a layered thermal insulation material and a preparation method and application thereof. The layered thermal insulation material provided by the invention comprises a rigid layer, a composite layer, a thermal insulation layer, a composite layer and a rigid layer which are sequentially stacked, the thermal insulation layer is composed of polyphenylene sulfide-graphene core-shell microspheres; the composite layer comprises organic silicon resin and carbon fibers distributed in the organic silicon resin. The result of the embodiment shows that the heat conductivity coefficient of the layered thermal insulation material provided by the invention is 1t; the ultra-thin heat-insulation board has the advantages of being good in heat-insulation and heat-preservation performance, good in mechanical performance, capable of meeting the performance requirements of processing, transporting and working, ultra-thin in structure, capable of normally working at 0.5 cm, and especially suitable for heat preservation in a narrow space.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a layered thermal insulation material and a preparation method and application thereof. Background Art

[0002] With the development of human society, people's living standards are improving day by day. People in cold areas have higher and higher requirements on the thermal insulation performance of buildings and household appliances to meet the human body's thermal insulation needs or save heat sources.

[0003] At present, the commonly used insulation materials are mainly solid insulation materials, flocculent insulation materials and foam insulation materials, especially foam insulation materials, which are more commonly used. However, this kind of insulation material requires a certain volume to play the role of its holes and achieve the insulation effect, which makes it impossible to use it in narrow spaces. Moreover, some buildings do not have much space reserved for insulation materials, which also puts forward requirements on the volume of insulation materials.

[0004] Therefore, how to reduce the volume of thermal insulation materials while ensuring the thermal insulation effect is an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a layered thermal insulation material and a preparation method and application thereof. The layered thermal insulation material provided by the present invention has a small volume and can work normally at 0.5 cm, and can be used in narrow spaces.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a layered thermal insulation material, comprising a first rigid layer, a first composite layer, a thermal insulation layer, a second composite layer and a second rigid layer stacked in sequence; the thermal insulation layer is composed of polyphenylene sulfide-graphene core-shell microspheres; the first composite layer and the second composite layer independently include silicone resin and carbon fibers distributed in the silicone resin.

[0008] Preferably, the first rigid layer and the second rigid layer are independently prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the first rigid layer is 0.15 to 0.78 mm; the thickness of the second rigid layer is 0.15 to 0.78 mm.

[0009] Preferably, in the first composite layer and the second composite layer, the weight average molecular weight of the silicone resin is 10,000 to 100,000; the length of the carbon fiber is 10 to 50 cm; the mass ratio of the silicone resin to the carbon fiber is 100:15 to 28; the thickness of the first composite layer is 1.35 to 3 mm; the thickness of the second composite layer is 1.35 to 3 mm.

[0010] Preferably, the thickness of the thermal insulation layer is 2 to 8 mm; the diameter of the polyphenylene sulfide-graphene core-shell microspheres is 1 to 1.3 mm; the volume ratio of polyphenylene sulfide to graphene in the polyphenylene sulfide-graphene core-shell microspheres is 100:50 to 70; and the graphene shell thickness of the polyphenylene sulfide-graphene core-shell microspheres is 0.2 to 0.4 mm.

[0011] Preferably, the layered thermal insulation material also includes a third rigid layer; the third rigid layer is arranged between the thermal insulation layer and the second composite layer or between the thermal insulation layer and the first composite layer; the third rigid layer is prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the third rigid layer is 0.10 to 0.40 mm.

[0012] The present invention also provides a method for preparing the layered thermal insulation material described in the above scheme, comprising the following steps:

[0013] Sodium silicate, bentonite, aluminum silicate wool and an adhesive are mixed and coated on the surface of a substrate and then cured to obtain a first rigid layer or a second rigid layer on the surface of the substrate;

[0014] The organic silicone resin monomer and the carbon fiber are mixed and coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer or a second rigid layer-second composite layer;

[0015] The polyphenylene sulfide-graphene core-shell microspheres are dispersed on the surface of the first rigid layer-first composite layer and / or the second rigid layer-second composite layer and then heated to obtain the layered thermal insulation material.

[0016] Preferably, the mass ratio of the sodium silicate to bentonite is 100:2-10; the mass ratio of the sodium silicate to aluminum silicate wool is 100:5-14; the mass ratio of the sodium silicate to the adhesive is 100:3-20.

[0017] Preferably, the preparation method of the polyphenylene sulfide-graphene core-shell microspheres is: mixing polyphenylene sulfide, N-methylpyrrolidone and a surfactant to obtain a polyphenylene sulfide mixed solution, mixing graphene and dimethylformamide to obtain a graphene solution, and mixing the polyphenylene sulfide mixed solution and the graphene solution for core-shell formation.

[0018] Preferably, when the layered thermal insulation material includes a third rigid layer, the preparation method of the third rigid layer is the same as that of the first rigid layer or the second rigid layer, and the prepared third rigid layer is removed and placed on the target layer.

[0019] The present invention also provides the use of the layered thermal insulation material described in the above scheme or the layered composite material obtained by the preparation method described in the above scheme in the field of thermal insulation of narrow spaces.

[0020] The present invention provides a layered thermal insulation material. The layered composite material provided by the present invention has good thermal insulation performance through the cooperation of each layer, especially the inner layer (except the rigid layer), a thermal conductivity coefficient of <0.015W / m·K, good mechanical properties, can meet the performance requirements of processing, transportation and work, and has an ultra-thin structure and can work normally at 0.5cm, and is particularly suitable for thermal insulation in narrow spaces.

[0021] The present invention also provides a method for preparing the layered thermal insulation material of the above scheme. The preparation method provided by the present invention has relatively simple steps, which makes it easy for staff to operate, reduces labor costs, and has huge economic advantages.

[0022] The present invention also provides the use of the layered thermal insulation material described in the above scheme or the layered composite material obtained by the preparation method described in the above scheme in the field of thermal insulation of narrow spaces. The layered composite material provided by the present invention has excellent thermal insulation performance and a small volume, and can be used in narrow spaces, such as the interlayer of a dryer, wall insulation, etc., with low cost and harmless to the human body. DETAILED DESCRIPTION

[0023] The present invention provides a layered thermal insulation material, comprising a first rigid layer, a first composite layer, a thermal insulation layer, a second composite layer and a second rigid layer stacked in sequence; the thermal insulation layer is composed of polyphenylene sulfide-graphene core-shell microspheres; the first composite layer and the second composite layer independently include silicone resin and carbon fibers distributed in the silicone resin.

[0024] The layered thermal insulation material provided by the present invention comprises a first rigid layer; the first rigid layer is preferably prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the first rigid layer is preferably 0.15 to 0.78 mm, more preferably 0.25 to 0.68 mm, further preferably 0.35 to 0.55 mm, and further preferably 0.412 mm.

[0025] The layered thermal insulation material provided by the present invention comprises a first composite layer; the first composite layer comprises a silicone resin and carbon fibers distributed in the silicone resin; the weight average molecular weight of the silicone resin is preferably 10,000 to 100,000, more preferably 35,000 to 75,000, and further preferably 50,000 to 55,000.

[0026] In the present invention, the length of the carbon fiber is preferably 10 to 50 cm, more preferably 20 to 40 cm, further preferably 30 to 35 cm, and further preferably 32 to 33 cm.

[0027] In the present invention, the mass ratio of the silicone resin to the carbon fiber is preferably 100:15-28, more preferably 100:17-25.5, further preferably 100:21-24, and further preferably 100:22.5.

[0028] In the present invention, the thickness of the first composite layer is preferably 1.35 to 3 mm, more preferably 1.5 to 2.5 mm, and further preferably 2 to 2.2 mm.

[0029] The layered thermal insulation material provided by the present invention comprises a thermal insulation layer; the thickness of the thermal insulation layer is preferably 2 to 8 mm, more preferably 3 to 7 mm, further preferably 4 to 6 mm, and further preferably 5 mm.

[0030] In the present invention, the thermal insulation layer is composed of polyphenylene sulfide-graphene core-shell microspheres; the polyphenylene sulfide-graphene core-shell microspheres are preferably arranged in a tightly packed manner; the diameter of the polyphenylene sulfide-graphene core-shell microspheres is preferably 1 to 1.3 mm, more preferably 1 to 1.2 mm, further preferably 1.05 to 1.15 mm, and further preferably 1.1 mm.

[0031] In the present invention, the volume ratio of polyphenylene sulfide to graphene in the polyphenylene sulfide-graphene core-shell microspheres is preferably 100:50-70, more preferably 100:55-65, further preferably 100:59-62, and further preferably 100:60-61.

[0032] In the present invention, the graphene shell thickness of the polyphenylene sulfide-graphene core-shell microspheres is preferably 0.2 to 0.4 mm, more preferably 0.24 to 0.36 mm, further preferably 0.26 to 0.31 mm, and further preferably 0.29 to 0.30 mm.

[0033] The layered thermal insulation material provided by the present invention comprises a second composite layer; the second composite layer comprises a silicone resin and carbon fibers distributed in the silicone resin; the weight average molecular weight of the silicone resin is preferably 10,000 to 100,000, more preferably 35,000 to 75,000, and further preferably 50,000 to 55,000.

[0034] In the present invention, the length of the carbon fiber is preferably 10 to 50 cm, more preferably 20 to 40 cm, further preferably 30 to 35 cm, and further preferably 32 to 33 cm.

[0035] In the present invention, the mass ratio of the silicone resin to the carbon fiber is preferably 100:15-28, more preferably 100:17-25.5, further preferably 100:21-24, and further preferably 100:22.5.

[0036] In the present invention, the thickness of the second composite layer is preferably 1.35 to 3 mm, more preferably 1.5 to 2.5 mm, and further preferably 2 to 2.2 mm.

[0037] The layered thermal insulation material provided by the present invention includes a second rigid layer; the second rigid layer is preferably prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the second rigid layer is preferably 0.15-0.78 mm, more preferably 0.25-0.68 mm, further preferably 0.35-0.55 mm, and further preferably 0.412 mm.

[0038] In the present invention, the layered thermal insulation material preferably also includes a third rigid layer; the third rigid layer is preferably arranged between the thermal insulation layer and the second composite layer or between the thermal insulation layer and the first composite layer; the third rigid layer is preferably prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the third rigid layer is preferably 0.10-0.40 mm, more preferably 0.15-0.35 mm, further preferably 0.20-0.30 mm, and further preferably 0.241 mm.

[0039] The present invention also provides a method for preparing the layered thermal insulation material described in the above scheme, comprising the following steps:

[0040] Sodium silicate, bentonite, aluminum silicate wool and an adhesive are mixed and coated on the surface of a substrate and then cured to obtain a first rigid layer or a second rigid layer on the surface of the substrate;

[0041] The organic silicone resin monomer and the carbon fiber are mixed and coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer or a second rigid layer-second composite layer;

[0042] The polyphenylene sulfide-graphene core-shell microspheres are dispersed on the surface of the first rigid layer-first composite layer and / or the second rigid layer-second composite layer and then heated to obtain the layered thermal insulation material.

[0043] In the present invention, sodium silicate, bentonite, aluminum silicate wool and an adhesive are mixed and coated (referred to as the first coating) on ​​the surface of a substrate and then cured to obtain a first rigid layer or a second rigid layer on the surface of the substrate. In the present invention, the mass ratio of the sodium silicate to the bentonite is preferably 100:2-10, more preferably 100:3-8, further preferably 100:4-7, and further preferably 100:4.8-4.9.

[0044] In the present invention, the mass ratio of the sodium silicate to the aluminum silicate wool is preferably 100:5-14, more preferably 100:7-10, and further preferably 100:8.88-9.14.

[0045] In the present invention, the mass ratio of the sodium silicate to the binder is preferably 100:3-20, more preferably 100:5-13, and further preferably 100:7-9.

[0046] In the present invention, the adhesive preferably includes one or more of polyurethane, polyacrylate and polystyrene.

[0047] In the present invention, the first coating is preferably knife coating.

[0048] In the present invention, the curing temperature is preferably 50 to 90 degrees Celsius, more preferably 60 to 70 degrees Celsius, and further preferably 65 degrees Celsius. The heat preservation time is preferably 2 to 4 hours, and more preferably 3 hours.

[0049] After obtaining the first rigid layer or the second rigid layer, the present invention coats the surface of the first rigid layer or the second rigid layer (referred to as the second coating) after mixing the organic silicone resin monomer and the carbon fiber to obtain the first rigid layer-first composite layer or the second rigid layer-second composite layer. In the present invention, the rotation speed of the mixing is preferably 300 to 1000 rpm, more preferably 500 to 700 rpm, and further preferably 600 rpm, and the stirring time is preferably 15 to 30 min, more preferably 18 to 27 min, and further preferably 21 to 24 min.

[0050] In the present invention, the second coating is preferably performed by brush coating or spin coating; the number of times of the second coating is preferably 3 times or more, more preferably 8 times or more.

[0051] After obtaining the first rigid layer-first composite layer or the second rigid layer-second composite layer, the present invention disperses polyphenylene sulfide-graphene core-shell microspheres on the surface of the first rigid layer-first composite layer and / or the second rigid layer-second composite layer and then heats to obtain the layered thermal insulation material. In the present invention, the preparation method of the polyphenylene sulfide-graphene core-shell microspheres is preferably: polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, graphene and dimethylformamide are mixed to obtain a graphene solution, the polyphenylene sulfide mixed solution and the graphene solution are mixed to perform core-shell formation to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0052] In the present invention, the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is preferably 1 to 10 mol / L, more preferably 3 to 8 mol / L, and further preferably 5 to 7 mol / L.

[0053] In the present invention, the concentration of graphene in the graphene solution is preferably 2 to 5 mol / L, more preferably 3 to 4 mol / L, and further preferably 3.5 mol / L.

[0054] In the present invention, the core-shell temperature is preferably 40 to 60 degrees Celsius, more preferably 45 to 55 degrees Celsius, and further preferably 50 degrees Celsius. The insulation time is preferably 3 to 8 hours, more preferably 5 to 6 hours, and further preferably 5.5 hours.

[0055] In the present invention, the heating temperature is preferably 65 to 85 degrees Celsius, more preferably 70 to 80 degrees Celsius, and further preferably 72 degrees Celsius. The insulation time is preferably more than 5 hours, more preferably more than 12 hours, and further preferably 18 to 27 hours.

[0056] In the present invention, the heating preferably includes post-processing; the post-processing preferably includes cooling and removing in sequence; the cooling is preferably natural cooling; the removing is preferably direct removal or steam removal.

[0057] In the present invention, when the layered thermal insulation material includes a third rigid layer, the preparation method of the third rigid layer is the same as that of the first rigid layer or the second rigid layer, and the prepared third rigid layer is removed and placed on the target layer.

[0058] The present invention also provides the use of the layered thermal insulation material described in the above scheme or the layered composite material obtained by the preparation method described in the above scheme in the field of thermal insulation of narrow spaces.

[0059] The layered composite material provided by the present invention has excellent thermal insulation performance and a small volume, and can be used in narrow spaces, such as the interlayer of a drying machine, wall insulation, etc. It is low in cost and harmless to the human body.

[0060] In order to further illustrate the present invention, the scheme of the present invention is described in detail below in conjunction with embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0061] Example 1

[0062] The present embodiment provides a layered thermal insulation material, comprising a first rigid layer (thickness 0.15 mm), a first composite layer (thickness 1.35 mm), a thermal insulation layer (thickness 2 mm), a second composite layer (thickness 1.35 mm) and a second rigid layer (thickness 0.15 mm) stacked in sequence.

[0063] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0064] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 1 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 2 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 40 degrees Celsius for 8 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0065] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polyurethane) are mixed in a mass ratio of 100:2:5:3. After coating on the surface of a substrate, the mixture is cured at 50 degrees Celsius for 4 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0066] The silicone resin monomer and carbon fiber (length 10 cm) in a mass ratio of 100:15 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer or a second rigid layer-second composite layer.

[0067] Polyphenylene sulfide-graphene core-shell microspheres (with a diameter of 1 mm, a shell thickness of 0.2 mm, and a volume ratio of polyphenylene sulfide to graphene of 100:50) are dispersed on the surface of the first rigid layer-first composite layer and the second rigid layer-second composite layer. The polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 65 degrees Celsius for 24 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0068] Example 2

[0069] The present embodiment provides a layered thermal insulation material, comprising a first rigid layer (thickness 0.78 mm), a first composite layer (thickness 3 mm), a thermal insulation layer (thickness 8 mm), a second composite layer (thickness 3 mm) and a second rigid layer (thickness 0.78 mm) stacked in sequence.

[0070] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0071] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 10 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 5 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 60 degrees Celsius for 3 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0072] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polyacrylate) are mixed in a mass ratio of 100:10:14:20. After coating on the surface of a substrate, the mixture is cured at 90 degrees Celsius for 2 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0073] The silicone resin monomer and carbon fiber (length 50 cm) in a mass ratio of 100:28 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer and a second rigid layer-second composite layer.

[0074] Polyphenylene sulfide-graphene core-shell microspheres (diameter 1.3 mm, shell thickness 0.4 mm, volume ratio of polyphenylene sulfide to graphene 100:70) are dispersed on the surface of the first rigid layer-first composite layer and the second rigid layer-second composite layer. The polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 85 degrees Celsius for 5 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0075] Example 3

[0076] The present embodiment provides a layered thermal insulation material, comprising a first rigid layer (thickness 0.4 mm), a first composite layer (thickness 2.4 mm), a thermal insulation layer (thickness 5 mm), a second composite layer (thickness 2.4 mm) and a second rigid layer (thickness 0.4 mm) stacked in sequence.

[0077] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0078] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 5 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 3 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 50 degrees Celsius for 5 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0079] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polystyrene) are mixed in a mass ratio of 100:5:9:10. After coating on the surface of a substrate, the mixture is cured at 70 degrees Celsius for 3 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0080] The silicone resin monomer and carbon fiber (length 30 cm) in a mass ratio of 100:22 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer and a second rigid layer-second composite layer.

[0081] Polyphenylene sulfide-graphene core-shell microspheres (diameter 1.1 mm, shell thickness 0.3 mm, volume ratio of polyphenylene sulfide to graphene 100:60) are dispersed on the surface of the first rigid layer-first composite layer and the second rigid layer-second composite layer. The polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 75 degrees Celsius for 12 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0082] Example 4

[0083] The present embodiment provides a layered thermal insulation material, comprising a first rigid layer (thickness 0.15 mm), a first composite layer (thickness 1.35 mm), a thermal insulation layer (thickness 3 mm), a second composite layer (thickness 2 mm) and a second rigid layer (thickness 0.5 mm) stacked in sequence.

[0084] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0085] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 8 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 4 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 55 degrees Celsius for 4 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0086] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polyacrylate) are mixed in a mass ratio of 100:6:10:14. After coating on the surface of a substrate, the mixture is cured at 90 degrees Celsius for 2.5 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0087] The silicone resin monomer and carbon fiber (length 15 cm) in a mass ratio of 100:18 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer and a second rigid layer-second composite layer.

[0088] Polyphenylene sulfide-graphene core-shell microspheres (diameter 1.3 mm, shell thickness 0.4 mm, volume ratio of polyphenylene sulfide to graphene 100:50) are dispersed on the surface of the first rigid layer-first composite layer and the second rigid layer-second composite layer. The polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 85 degrees Celsius for 6 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0089] Example 5

[0090] The present embodiment provides a layered thermal insulation material, including a first rigid layer (thickness 0.78 mm), a first composite layer (thickness 1.35 mm), a third rigid layer (thickness 0.10 mm), a thermal insulation layer (thickness 8 mm), a second composite layer (thickness 1.35 mm) and a second rigid layer (thickness 0.78 mm) stacked in sequence.

[0091] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0092] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 10 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 5 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 40 degrees Celsius for 8 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0093] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polyurethane, polyacrylate and polystyrene) are mixed in a mass ratio of 100:9:13:18. After coating on the surface of a substrate, the mixture is cured at 90 degrees Celsius for 2 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0094] The silicone resin monomer and carbon fiber (length 50 cm) in a mass ratio of 100:28 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer and a second rigid layer-second composite layer.

[0095] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polystyrene) are mixed in a mass ratio of 100:2:5:5. After coating on the surface of the substrate, the mixture is cured at 50 degrees Celsius for 3 hours to obtain a third rigid layer on the surface of the substrate. The third rigid layer is removed and placed on the surface of the first composite layer.

[0096] Polyphenylene sulfide-graphene core-shell microspheres (diameter 1.3 mm, shell thickness 0.2 mm, volume ratio of polyphenylene sulfide to graphene 100:60) are dispersed on the surface of the second rigid layer-second composite layer, and the polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 75 degrees Celsius for 18 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0097] Example 6

[0098] The present embodiment provides a layered thermal insulation material, comprising a first rigid layer (thickness 0.15 mm), a first composite layer (thickness 1.35 mm), a third rigid layer (thickness 0.40 mm), a thermal insulation layer (thickness 2 mm), a second composite layer (thickness 1.35 mm) and a second rigid layer (thickness 0.15 mm) stacked in sequence.

[0099] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0100] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 7 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 4 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 45 degrees Celsius for 6 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0101] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polystyrene) are mixed in a mass ratio of 100:10:14:20. After coating on the surface of a substrate, the mixture is cured at 90 degrees Celsius for 2 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0102] The silicone resin monomer and carbon fiber (length 35 cm) in a mass ratio of 100:23 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer and a second rigid layer-second composite layer.

[0103] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polystyrene) are mixed in a mass ratio of 100:2:14:20. After coating on the surface of the substrate, the mixture is cured at 76 degrees Celsius for 3.6 hours to obtain a third rigid layer on the surface of the substrate. The third rigid layer is removed and placed on the surface of the first composite layer.

[0104] Polyphenylene sulfide-graphene core-shell microspheres (diameter 1.2 mm, shell thickness 0.3 mm, volume ratio of polyphenylene sulfide to graphene 100:55) are dispersed on the surface of the second rigid layer-second composite layer, and the polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 70 degrees Celsius for 20 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0105] Example 7

[0106] The present embodiment provides a layered thermal insulation material, comprising a first rigid layer (thickness 0.78 mm), a first composite layer (thickness 3 mm), a third rigid layer (thickness 0.40 mm), a thermal insulation layer (thickness 8 mm), a second composite layer (thickness 3 mm) and a second rigid layer (thickness 0.78 mm) stacked in sequence.

[0107] The method for preparing the layered thermal insulation material described in this embodiment comprises the following steps:

[0108] Polyphenylene sulfide, N-methylpyrrolidone and a surfactant are mixed to obtain a polyphenylene sulfide mixed solution, wherein the concentration of polyphenylene sulfide in the polyphenylene sulfide mixed solution is 10 mol / L; graphene and dimethylformamide are mixed to obtain a graphene solution, wherein the concentration of graphene in the graphene solution is 5 mol / L; the polyphenylene sulfide mixed solution and the graphene solution are mixed, and core-shell reaction is performed at 60 degrees Celsius for 8 hours to obtain polyphenylene sulfide-graphene core-shell microspheres.

[0109] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polyurethane) are mixed in a mass ratio of 100:10:5:10. After coating on the surface of a substrate, the mixture is cured at 90 degrees Celsius for 2 hours to obtain a first rigid layer and a second rigid layer on the surface of the substrate.

[0110] The silicone resin monomer and carbon fiber (length 50 cm) in a mass ratio of 100:15 were stirred and mixed, and then coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer or a second rigid layer-second composite layer.

[0111] Sodium silicate, bentonite, aluminum silicate wool and adhesive (polystyrene) are mixed in a mass ratio of 100:10:8:13. After coating on the surface of the substrate, the mixture is cured at 90 degrees Celsius for 4 hours to obtain a third rigid layer on the surface of the substrate. The third rigid layer is removed and placed on the surface of the first composite layer.

[0112] Polyphenylene sulfide-graphene core-shell microspheres (diameter 1.3 mm, shell thickness 0.4 mm, volume ratio of polyphenylene sulfide to graphene 100:70) are dispersed on the surface of the second rigid layer-second composite layer, and the polyphenylene sulfide-graphene core-shell microspheres are arranged in a densely stacked manner, and then heated at 85 degrees Celsius for 5 hours, naturally cooled, and removed to obtain the layered thermal insulation material.

[0113] The performance of the layered composite materials prepared in Examples 1 to 7 was tested, and the thermal conductivity of the materials was calculated according to the Fourier thermal conductivity equation:

[0114] K = -Q / [S (dT / dx) t] Formula I;

[0115] In formula I, K is the thermal conductivity, Q is the heat transferred by the material, S is the cross-sectional area of ​​the material, dT is the temperature difference, x is the material thickness (dT / dx is the temperature gradient), and t is the thermal conductivity test time. The results are shown in Table 1.

[0116] Table 1 Thermal conductivity of the layered composite materials prepared in Examples 1 to 7

[0117] project Thermal conductivity Example 1 0.009W / m·K Example 2 0.011W / m·K Example 3 0.014W / m·K Example 4 0.010W / m·K Example 5 0.011W / m·K Example 6 0.013W / m·K Example 7 0.012W / m·K

[0118] It can be seen from Table 1 that the layered thermal insulation material provided by the present invention has a thermal conductivity of <0.015 W / m·K and has good thermal insulation performance.

[0119] The compressive strength mechanical properties of the layered composite materials prepared in Examples 1 to 7 were tested, and the results are shown in Table 2.

[0120] Table 2 Compressive strength of the layered composite materials prepared in Examples 1 to 7

[0121]

[0122]

[0123] It can be seen from Table 2 that the compressive strength of the layered composite material prepared by the present invention is above 0.70 MPa, which ensures the normal operation of the layered composite material and can meet the performance requirements of processing, transportation and work.

[0124] The tensile strength mechanical properties of the layered composite materials prepared in Examples 1 to 7 were tested, and the results are shown in Table 3.

[0125] Table 3 Tensile strength of the layered composite materials prepared in Examples 1 to 7

[0126] project Tensile strength / MPa Example 1 0.22 Example 2 0.27 Example 3 0.25 Example 4 0.26 Example 5 0.27 Example 6 0.24 Example 7 0.21

[0127] It can be seen from Table 3 that the layered composite material prepared by the present invention has a tensile strength of more than 0.21 MPa and good mechanical properties.

[0128] It can be seen from the above embodiments that the layered thermal insulation material provided by the present invention has a thermal conductivity of <0.015W / m·K, has good thermal insulation performance, good mechanical properties, can meet the performance requirements of processing, transportation and work, has an ultra-thin structure, and can work normally at 0.5cm, and is particularly suitable for insulation in narrow spaces.

[0129] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A layered thermal insulation material, characterized in that: It comprises a first rigid layer, a first composite layer, a thermal insulation layer, a second composite layer and a second rigid layer which are stacked in sequence; the thermal insulation layer is composed of polyphenylene sulfide-graphene core-shell microspheres; the first composite layer and the second composite layer independently comprise silicone resin and carbon fibers distributed in the silicone resin.

2. The layered thermal insulation material according to claim 1, characterized in that: The first rigid layer and the second rigid layer are independently prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the first rigid layer is 0.15 to 0.78 mm; the thickness of the second rigid layer is 0.15 to 0.78 mm.

3. The layered thermal insulation material according to claim 1 or 2, characterized in that: In the first composite layer and the second composite layer, the weight average molecular weight of the silicone resin is 10,000 to 100,000; the length of the carbon fiber is 10 to 50 cm; the mass ratio of the silicone resin to the carbon fiber is 100:15 to 28; the thickness of the first composite layer is 1.35 to 3 mm; the thickness of the second composite layer is 1.35 to 3 mm.

4. The layered thermal insulation material according to claim 1, characterized in that: The thickness of the thermal insulation layer is 2 to 8 mm; the diameter of the polyphenylene sulfide-graphene core-shell microspheres is 1 to 1.3 mm; the volume ratio of polyphenylene sulfide to graphene in the polyphenylene sulfide-graphene core-shell microspheres is 100:50 to 70; the graphene shell thickness of the polyphenylene sulfide-graphene core-shell microspheres is 0.2 to 0.4 mm.

5. The layered thermal insulation material according to claim 1 or 4, characterized in that: The layered thermal insulation material also includes a third rigid layer; the third rigid layer is arranged between the thermal insulation layer and the second composite layer or between the thermal insulation layer and the first composite layer; the third rigid layer is prepared from sodium silicate, bentonite and aluminum silicate wool; the thickness of the third rigid layer is 0.10 to 0.40 mm.

6. The method for preparing the layered thermal insulation material according to any one of claims 1 to 5, characterized in that: The following steps are involved: Sodium silicate, bentonite, aluminum silicate wool and an adhesive are mixed and coated on the surface of a substrate and then cured to obtain a first rigid layer or a second rigid layer on the surface of the substrate; The organic silicone resin monomer and the carbon fiber are mixed and coated on the surface of the first rigid layer or the second rigid layer to obtain a first rigid layer-first composite layer or a second rigid layer-second composite layer; The polyphenylene sulfide-graphene core-shell microspheres are dispersed on the surface of the first rigid layer-first composite layer and / or the second rigid layer-second composite layer and then heated to obtain the layered thermal insulation material.

7. The preparation method according to claim 6, characterized in that: The mass ratio of the sodium silicate to bentonite is 100:2-10; the mass ratio of the sodium silicate to aluminum silicate wool is 100:5-14; the mass ratio of the sodium silicate to the adhesive is 100:3-20.

8. The preparation method according to claim 6 or 7, characterized in that: The preparation method of the polyphenylene sulfide-graphene core-shell microspheres comprises: mixing polyphenylene sulfide, N-methylpyrrolidone and a surfactant to obtain a polyphenylene sulfide mixed solution, mixing graphene and dimethylformamide to obtain a graphene solution, and mixing the polyphenylene sulfide mixed solution and the graphene solution to perform core-shell formation.

9. The preparation method according to claim 6, characterized in that: When the layered thermal insulation material includes a third rigid layer, the preparation method of the third rigid layer is the same as that of the first rigid layer or the second rigid layer, and the prepared third rigid layer is removed and then placed on the target layer.

10. Use of the layered thermal insulation material according to any one of claims 1 to 5 or the layered composite material obtained by the preparation method according to any one of claims 6 to 9 in the field of thermal insulation of narrow spaces.

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