A rare earth-based fabric with dual functions of heat insulation and warmth preservation, and its preparation method and application

Abstract

The present invention provides a rare earth-based fabric with dual functions of heat insulation and warmth preservation, and a preparation method and application thereof, wherein the rare earth-based fabric comprises an A surface and a B surface, wherein the A surface is an emitting heat insulation fiber layer prepared from an emitting heat insulation slurry and a high molecular polymer as raw materials, and the B surface is an absorbing heat fiber layer prepared from an absorbing heat slurry and a high molecular polymer as raw materials; the emitting heat insulation slurry comprises rare earth-doped potassium hexatitanate and titanate, and the absorbing heat slurry comprises vanadium dioxide co-doped with rare earth and tungsten. The dual functions of heat insulation and warmth preservation described in the present invention can adapt to the changes in winter and summer seasons, and can also adapt to the use in various occasions during the day and night, providing the effects of heat insulation and warmth preservation or heat resistance and cooling, and has a wide range of applications.

Description

Technical Field

[0001] The invention belongs to the field of functional fabrics, and in particular relates to a rare earth-based fabric with dual functions of heat insulation and warmth preservation, and a preparation method and application thereof. Background Art

[0002] The development trend of modern tent fabrics in winter is to achieve multifunctionality to meet the use requirements under different environmental conditions. Especially in outdoor activities, tents must not only be windproof and rainproof, but also provide warmth or insulation according to seasonal changes. Currently, most tents on the market focus on a single function, such as a warm tent for winter or a heat-insulating tent for summer, which cannot meet the needs of both winter and summer seasons.

[0003] For example, patent CN 105128433 B provides a tent fabric with cold-proof and frost-resistant functions. The fabric adopts a multi-layer structure design with a heat-absorbing layer and a heat-insulating layer, which effectively blocks the impact of cold weather on the interior of the tent. However, the heat-insulating effect of the fabric is limited in high-temperature summer environments, which can easily cause overheating inside the tent. In addition, patent CN 116080161 B introduces a flame-retardant and UV-proof sunshade awning fabric, which is suitable for summer use because it prevents the penetration of ultraviolet rays through a special coating and reflective layer design. However, the material has insufficient thermal insulation performance in low-temperature winter environments and cannot effectively maintain the temperature inside the tent.

[0004] In view of the above problems, it is urgent to develop a new type of tent fabric that can achieve the dual functions of warmth preservation and heat insulation, adapt to the changes of four seasons, and reduce the frequency and cost of changing tents for outdoor enthusiasts. Summary of the invention

[0005] In view of this, the present invention aims to overcome the defects in the prior art and proposes a rare earth-based fabric with dual functions of heat insulation and warmth retention, and a preparation method and application thereof.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] In the first aspect, the present invention provides a rare earth-based fabric with dual functions of heat insulation and warmth retention, the rare earth-based fabric comprising an A side and a B side, the A side is an emissive heat-insulating fiber layer prepared from an emissive heat-insulating slurry and a high molecular polymer as raw materials, the B side is an endothermic fiber layer prepared from an endothermic slurry and a high molecular polymer as raw materials; the emissive heat-insulating slurry comprises rare earth-doped potassium hexatitanate and titanate, the endothermic slurry comprises vanadium dioxide co-doped with rare earth and tungsten.

[0008] Preferably, the rare earth doped potassium hexatitanate has a structural formula of Re m K 2-3m Ti 6 O13 , wherein Re is a rare earth element selected from one or more of lanthanum, cerium, yttrium, and europium, 0.01 <m≤0.2。

[0009] Preferably, the preparation method of rare earth-doped potassium hexatitanate comprises the following steps:

[0010] (1) mixing potassium carbonate, titanium dioxide and a first rare earth source according to a molar ratio;

[0011] (2) ball milling the mixture in a planetary ball mill using deionized water as a medium for 6-24 hours, and then drying at a temperature of 80-110° C. for 10-24 hours;

[0012] (3) calcining the dried mixture in a muffle furnace at 800-1200° C. for 6-48 hours to obtain rare earth-doped potassium hexatitanate powder.

[0013] Preferably, the first rare earth source is a rare earth carbonate or a rare earth chloride, wherein the rare earth carbonate is selected from one or a mixture of two or more of lanthanum carbonate, cerium carbonate, yttrium carbonate and europium carbonate; the rare earth chloride is selected from one or a mixture of two or more of lanthanum chloride, cerium chloride, yttrium chloride and europium chloride.

[0014] Preferably, the titanate is one of barium titanate, strontium titanate, calcium titanate, zinc titanate, or a mixture of two or more thereof.

[0015] Preferably, the emission insulation slurry is prepared from the following components in parts by weight:

[0016] 20-50 parts by weight of rare earth doped potassium hexatitanate powder, 20-40 parts by weight of titanate powder, 50-80 parts by weight of dispersion medium, 5-20 parts by weight of surfactant, 1-5 parts by weight of anti-aging agent, and 0.5-2 parts by weight of defoaming agent.

[0017] Preferably, the method for preparing the emission insulation slurry comprises the following steps:

[0018] Rare earth doped potassium hexatitanate powder, titanate powder, dispersion medium, surfactant, anti-aging agent and defoamer are mixed and dispersed evenly with a disperser, and then ultrasonicated for 1h-5h and then put into a sand mill for 3-8h to obtain an emission insulation slurry with a particle size D90 of 200-500nm.

[0019] Preferably, the rare earth and tungsten co-doped vanadium dioxide has a structural formula of Re x W y V z O 2 , wherein Re is a rare earth element selected from one or more of lanthanum, cerium, and neodymium, 0.01 <x<0.2,0.01<y≤0.02,0.75<z<1。

[0020] Preferably, the method for preparing rare earth and tungsten co-doped vanadium dioxide comprises the following steps:

[0021] a. Add vanadium pentoxide, ammonium tungstate and the second rare earth source to a mixed solution of deionized water and anhydrous ethanol in a molar ratio, and then add acid to adjust the pH of the solution to 4-6;

[0022] b. After subjecting the mixed solution of step a to ultrasonic treatment for 0.5-2h, the mixed solution was transferred to a hydrothermal reactor and reacted at 180-240°C for 24-72h;

[0023] c. After washing, the mixture is dried at 80-100° C. for 10-16 hours, and then placed in a tubular furnace filled with argon gas and calcined at 450-700° C. for 2-4 hours to obtain rare earth and tungsten co-doped vanadium dioxide powder.

[0024] Preferably, the second rare earth source is a rare earth carbonate or a rare earth chloride, wherein the rare earth carbonate is selected from one or a mixture of two or more of lanthanum carbonate, cerium carbonate, and neodymium carbonate; and the rare earth chloride is selected from one or a mixture of two or more of lanthanum chloride, cerium chloride, and neodymium carbonate.

[0025] Preferably, the endothermic slurry is prepared from the following components in parts by weight:

[0026] 10-50 parts by weight of rare earth and tungsten co-doped vanadium dioxide powder, 50-80 parts by weight of dispersion medium, 5-15 parts by weight of surfactant, 1-5 parts by weight of anti-aging agent, and 0.5-2 parts by weight of defoaming agent.

[0027] Preferably, the method for preparing the endothermic slurry comprises the following steps:

[0028] The endothermic slurry, dispersion medium, surfactant, anti-aging agent and defoaming agent are mixed and dispersed evenly with a disperser, and then ultrasonicated for 1-5 hours and then put into a sand mill for 4-9 hours to obtain the endothermic slurry with a particle size D90 of 200-500nm.

[0029] Preferably, the dispersion medium in the emission heat insulation slurry and the absorption heat slurry is independently selected from one or a mixture of two or more of deionized water, isopropyl alcohol, ethyl acetate, and propylene glycol methyl ether acetate.

[0030] Preferably, the surfactants in the emission insulation slurry and the absorption slurry are independently selected from one or a mixture of two or more of sodium dodecyl sulfate, silane coupling agent KH560, polyethylene glycol, sodium polyacrylate, sodium carboxymethyl cellulose, and alkyl polyglucoside.

[0031] Preferably, the anti-aging agents in the emission insulation slurry and the endothermic slurry are independently selected from one or a mixture of two or more of butylated hydroxyanisole, bis(2,2,6,6-tetramethylpiperidinium)dehydroacetic acid, and 2-hydroxy-4-methoxyphenylbenzenetrione.

[0032] Preferably, the defoaming agents in the emission heat insulation slurry and the heat absorption slurry are independently selected from one or a mixture of two or more of BYK111, DF 892, and FoamStar A10.

[0033] Preferably, the high molecular polymer is one or a mixture of two or more of polybutylene terephthalate (PBT), polyurethane (PU), polyethylene terephthalate (PET), and polystyrene (PS).

[0034] In a second aspect, the present invention also provides a method for preparing the rare earth-based fabric having the dual functions of heat insulation and warmth preservation, comprising the following steps:

[0035] S1, preparing an emission heat insulation fiber by hot mixing, granulating and spinning 30-60 parts by mass of emission heat insulation slurry and 50-80 parts by mass of high molecular polymer;

[0036] S2, preparing heat-absorbing fibers by hot mixing, granulating and spinning 10-60 parts by mass of heat-absorbing slurry and 40-80 parts of high molecular polymer;

[0037] S3. The emitting heat-insulating fibers and the absorbing heat-insulating fibers are woven into cloths by looms respectively, and rare earth-based fabrics with dual functions of heat insulation and warmth retention are prepared by hot pressing.

[0038] Preferably, the specific steps of step S1 are: heating and mixing the emissive thermal insulation slurry and the high molecular polymer in a hot mixer to remove moisture from the mixture so that the moisture content is not higher than 200 ppm, and then putting it into a twin-screw granulator, and obtaining the emissive thermal insulation functional masterbatch through high-temperature melt extrusion granulation; after the emissive thermal insulation functional masterbatch is sprayed out from the melt spinning machine, it is subjected to two processes of condensation and winding to obtain the emissive thermal insulation fiber.

[0039] Preferably, the specific steps of step S2 are: heating and mixing the endothermic slurry and the high molecular polymer in a hot mixer to remove moisture from the mixture so that the moisture content is not higher than 200 ppm, and then putting it into a twin-screw granulator, and obtaining the endothermic functional masterbatch through high-temperature melt extrusion granulation; the endothermic functional masterbatch is sprayed out from the melt spinning machine and subjected to two processes of condensation and winding to obtain the endothermic fiber.

[0040] Preferably, the high temperature melting temperature in step S1 and step S2 is independently selected from 220-260°C.

[0041] In a third aspect, the present invention also provides the use of the rare earth-based fabric having the dual functions of heat insulation and warmth preservation in the preparation of outdoor tents.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] (1) Potassium hexatitanate has excellent visible light reflectivity. Rare earth ions have a unique 4f valence electron structure. Rare earth doping can improve the reflectivity of potassium hexatitanate in the near-infrared band, thereby achieving excellent reflectivity in the entire visible-near-infrared band. Vanadium dioxide is a phase change material that undergoes a reversible metal-insulator transition between a semiconductor low-temperature phase and a metallic high-temperature phase at 68°C. Doping with rare earth ions and tungsten ions can reduce the phase transition temperature of vanadium dioxide to room temperature while improving its near-infrared shielding performance.

[0044] (2) The A side of the fabric of the present invention is woven from emitting heat-insulating fibers prepared from rare earth-doped potassium hexatitanate and titanate as functional powders, and the emitting heat-insulating fibers have good visible-near-infrared light reflectivity and far-infrared emissivity. The B side is woven from heat-absorbing fibers prepared from rare earth and tungsten co-doped vanadium dioxide as functional powders, and the heat-absorbing fibers have high visible-near-infrared absorptivity and low far-infrared emissivity.

[0045] (3) When the outdoor temperature is high, the emitting heat-insulating fiber layer on the A side faces outward and can block most of the energy in the visible-near infrared band, and at the same time radiate the heat in the form of far infrared rays, playing a role in heat insulation and cooling. The heat-absorbing fiber layer on the B side can absorb the heat inside the tent and concentrate it in the fibers to reduce the temperature inside the tent. Compared with ordinary double-layer fabrics, it can reduce the temperature by 4.3°C. When the outdoor temperature is low, the heat-absorbing fiber layer on the B side faces outward and can absorb the energy in the visible-near infrared light and convert it into heat energy and store it in the fibers. At the same time, the emitting heat-insulating fiber layer on the A side can radiate the heat emitted by the human body to the human body in the form of far infrared rays, reducing heat loss and maintaining the temperature of the internal environment of the tent. Compared with ordinary double-layer fabrics, it can increase the temperature by 6.7°C.

[0046] (4) The addition of surfactants to the fabric of the present invention can, on the one hand, act as a dispersant during the sanding process, and on the other hand, can also improve the affinity and compatibility between the inorganic functional particles and the polymer compounds, thereby maintaining the strength of the fiber while giving the fiber functionality.

[0047] (5) The dual-function fabric with heat insulation and warmth retention described in the present invention can adapt to the changes in winter and summer seasons, and can also be used in various occasions during the day and at night, providing the effects of heat insulation and warmth retention or heat resistance and cooling, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is La in Example 1 0.2 K1.4 Ti 6 O 13 XRD pattern of

[0049] Figure 2 is La in Example 1 0.05 W 0.02 V 0.93 O 2 and La in Example 4 0.15 W 0.02 V 0.85 O 2 XRD pattern of . DETAILED DESCRIPTION

[0050] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods, unless otherwise specified, are all conventional methods.

[0051] The present invention will be described in detail below with reference to the embodiments.

[0052] Example 1

[0053] (1) Preparation of La 0.2 K 1.4 Ti 6 O 13

[0054] a. Weigh lanthanum chloride, potassium carbonate and titanium dioxide in a molar ratio of La:K:Ti=0.2:1.4:6 and mix them evenly.

[0055] b. The mixture was ball-milled in a planetary ball mill with deionized water as the medium for 6 h to reduce the particle size and improve the mixing uniformity, and then dried in a drying oven at 80°C for 24 h.

[0056] c. The dried mixture was calcined in a muffle furnace at 1000°C for 16 h to obtain La 0.2 K 1.4 Ti 6 O 13 , its XRD pattern is as follows Figure 1 shown.

[0057] (2) Preparation of La 0.05 W 0.02 V 0.93 O 2 :

[0058] a. Weigh lanthanum carbonate, ammonium tungstate and vanadium pentoxide in a molar ratio of La:W:V=0.05:0.02:0.93 and mix them evenly. Add all the raw materials into a mixed solution of deionized water: anhydrous ethanol=2:1, and then add oxalic acid to adjust the pH of the solution to 6;

[0059] b. After ultrasonic treatment for 1 h, the solution was transferred to a hydrothermal reactor and reacted at 240 °C for 36 h;

[0060] c. After washing, it was dried in an oven at 80°C for 12 hours, and then placed in a tubular furnace with argon gas and calcined at 700°C for 3 hours to obtain La 0.05 W 0.02 V 0.93 O 2 Powder, its XRD pattern is as follows Figure 2 shown.

[0061] (3) Preparation of thermal insulation and warmth dual-function fabrics:

[0062] a. Take the La prepared in step (1) 0.2 K 1.4 Ti 6 O 13 40 parts by mass, 10 parts by mass of barium titanate, 10 parts by mass of strontium titanate, 80 parts by mass of deionized water, 10 parts by mass of sodium polyacrylate, 3 parts by mass of bis(2,2,6,6-tetramethylpiperidinium)dehydroacetic acid, and 0.5 parts by mass of defoamer BYK111 are uniformly dispersed in a disperser, ultrasonicated for 1 hour, and then put into a sand mill for 3 hours to obtain an emissive thermal insulation slurry with a particle size of D90=200-300nm.

[0063] b. 30 parts by mass of the emission thermal insulation slurry and 50 parts by mass of the polymer material ethylene terephthalate are heated and mixed in a hot mixer to remove the moisture in the mixture, wherein the moisture content is not higher than 200 ppm, and then put into a twin-screw granulator, and granulate by high-temperature melt extrusion to obtain the emission thermal insulation functional masterbatch; the emission thermal insulation functional masterbatch is sprayed out from the melt spinning machine and subjected to two processes of condensation and winding to obtain the emission thermal insulation fiber.

[0064] c. La prepared in step (2) 0.05 W 0.02 V 0.93 O 2 20 parts by mass, 50 parts by mass of ethyl acetate, 5 parts by mass of sodium polyacrylate, 1 part by mass of butylated hydroxyanisole and 0.5 parts by mass of defoamer DF 892 were dispersed uniformly in a disperser, ultrasonicated for 1 hour, and then put into a sand mill for 4 hours to obtain an endothermic slurry with a particle size of D90 = 200-300nm.

[0065] d. 10 parts by mass of the endothermic slurry and 40 parts by mass of the polymer material polystyrene are heated and mixed in a hot mixer to remove moisture from the mixture, wherein the moisture content is not higher than 200 ppm, and then put into a twin-screw granulator, and obtain endothermic functional masterbatch through high-temperature melt extrusion granulation; the endothermic functional masterbatch is sprayed out from a melt spinning machine and subjected to two processes of condensation and winding to obtain endothermic fiber.

[0066] e. The emitting heat-insulating fibers and the absorbing heat-insulating fibers are woven into cloths by looms respectively, and rare earth-based fabrics with dual functions of heat insulation and warmth retention are prepared by hot pressing.

[0067] Example 2

[0068] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0069] Preparation of La 0.1 K 1.7 Ti 6 O 13 :

[0070] Weigh lanthanum chloride, potassium carbonate and titanium dioxide according to the ratio of La:K:Ti=0.1:1.7:6.

[0071] Example 3

[0072] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0073] Preparation of La 0.1 W 0.02 V 0.89 O 2 :

[0074] Lanthanum carbonate, ammonium tungstate and vanadium pentoxide were weighed according to the molar ratio of La:W:V=0.1:0.02:0.89.

[0075] Example 4

[0076] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0077] Preparation of La 0.15 W 0.02 V 0.85 O 2 :

[0078] Lanthanum carbonate, ammonium tungstate and vanadium pentoxide were weighed at a molar ratio of La:W:V=0.15:0.02:0.85 to obtain La 0.15 W0.02 V 0.85 O 2 Powder XRD diagram Figure 2 shown.

[0079] Example 5

[0080] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0081] Preparation of Eu 0.15 W 0.02 V 0.85 O 2 :

[0082] Weigh europium carbonate, ammonium tungstate and vanadium pentoxide according to the molar ratio of Eu:W:V=0.15:0.02:0.85.

[0083] Example 6

[0084] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0085] Preparation of Ce 0.02 K 1.94 Ti 6 O 13 :

[0086] Weigh cerium carbonate, potassium carbonate and titanium dioxide according to the molar ratio of Ce:K:Ti=0.02:1.94:6;

[0087] Preparation of Ce 0.1 W 0.02 V 0.8 O 2 :

[0088] Weigh cerium carbonate, ammonium tungstate and vanadium pentoxide according to the molar ratio of Ce:W:V=0.1:0.02:0.8;

[0089] Ce in emission insulation slurry 0.02 K 1.94 Ti 6 O 13 40 parts by mass, calcium titanate 20 parts by mass, zinc titanate 20 parts by mass, isopropyl alcohol 50 parts by mass, sodium lauryl sulfate 5 parts by mass, 2-hydroxy-4-methoxyphenylbenzenetrione 1 part by mass, defoamer BYK111 2 parts by mass;

[0090] Ce in heat absorbing slurry 0.1 W 0.02 V 0.8 O 210 parts by mass, 80 parts by mass of ethyl acetate, 5 parts by mass of silane coupling agent KH5601, 5 parts by mass of butylated hydroxyanisole, and 2 parts by mass of defoaming agent DF 892.

[0091] Example 7

[0092] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0093] Preparation of Y 0.2 K 1.4 Ti 6 O 13 :

[0094] Weigh yttrium chloride, potassium carbonate and titanium dioxide according to the molar ratio of Y:K:Ti=0.2:1.4:6;

[0095] Preparation of Nd 0.1 W 0.015 V 0.9 O 2 :

[0096] Weigh neodymium carbonate, ammonium tungstate and vanadium pentoxide in a molar ratio of Nd:W:V=0.1:0.015:0.9;

[0097] Y in emission insulation slurry 0.2 K 1.4 Ti 6 O 13 50 parts by mass, 15 parts by mass of calcium titanate, 15 parts by mass of zinc titanate, 70 parts by mass of isopropyl alcohol, 20 parts by mass of sodium lauryl sulfate, 5 parts by mass of 2-hydroxy-4-methoxyphenylbenzenetrione, and 1 part by mass of defoamer BYK111;

[0098] Nd in heat absorbing slurry 0.1 W 0.015 V 0.9 O 2 50 parts by mass, 60 parts by mass of propylene glycol methyl ether acetate, 10 parts by mass of silane coupling agent KH560, 3 parts by mass of butylated hydroxyanisole, and 1 part by mass of defoaming agent DF 892.

[0099] Example 8

[0100] Steps (1) and (2) of this embodiment are the same as those of embodiment 1, except that: the heat-insulating and heat-retaining dual-function fabric is prepared in the following specific steps:

[0101] (1) Take the La prepared in step (1) of Example 1 0.2 K 1.4 Ti 6 O 1350 parts by mass, 10 parts by mass of zinc titanate, 10 parts by mass of calcium titanate, 80 parts by mass of deionized water, 20 parts by mass of polyethylene glycol, 5 parts by mass of 2-hydroxy-4-methoxyphenylbenzenetrione, and 2 parts by mass of defoamer FoamStar A10 are uniformly dispersed in a disperser, ultrasonicated for 5 hours, and then put into a sand mill for 5 hours to obtain an emissive thermal insulation slurry with a particle size of D90=200-300nm.

[0102] (2) 60 parts by weight of an emissive thermal insulation slurry and 80 parts by weight of a polymer material, polybutylene terephthalate, are heated and mixed in a hot mixer to remove moisture from the mixture, wherein the moisture content is not higher than 200 ppm. The mixture is then placed in a twin-screw granulator and subjected to high-temperature melt extrusion granulation to obtain an emissive thermal insulation functional masterbatch. The emissive thermal insulation functional masterbatch is ejected from a melt spinning machine and subjected to two processes of condensation and winding to obtain an emissive thermal insulation fiber.

[0103] (3) La prepared in Example 3 0.1 W 0.02 V 0.89 O 2 50 parts by mass, 80 parts by mass of deionized water, 15 parts by mass of sodium carboxymethyl cellulose, 5 parts by mass of 2-hydroxy-4-methoxyphenylbenzenetrione, and 2 parts by mass of defoamer DF 892 were uniformly mixed in a disperser, ultrasonicated for 3 hours, and then put into a sand mill for 3 hours to obtain an endothermic slurry with a particle size of D90 = 200-300nm.

[0104] (4) 60 parts by weight of the endothermic slurry and 80 parts by weight of the polymer material polyurethane are heated and mixed in a hot mixer to remove moisture from the mixture, wherein the moisture content is not higher than 200 ppm. The mixture is then placed in a twin-screw granulator and subjected to high-temperature melt extrusion granulation to obtain an endothermic functional masterbatch. The endothermic functional masterbatch is ejected from a melt spinning machine and subjected to two processes of condensation and winding to obtain an endothermic fiber.

[0105] (5) The heat-insulating emissive fibers and the heat-absorbing fibers are woven into fabrics by a loom, and then the heat-insulating and warm dual-functional fabrics are prepared by hot pressing.

[0106] Comparative Example 1 Preparation of polystyrene cloth

[0107] (1) Weigh 50 parts by weight of a polymer material polystyrene and dry it in an oven to obtain a water content of no more than 200 ppm. Then put it into a twin-screw granulator and perform high-temperature melt extrusion granulation to obtain a polystyrene masterbatch. The polystyrene masterbatch is ejected from a melt spinning machine and subjected to two steps of condensation and winding to obtain polystyrene fibers.

[0108] (2) Polystyrene fibers are woven into cloth using a loom, and double-layer polystyrene cloth is prepared by hot pressing.

[0109] Comparative Example 2

[0110] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that: La is not added to the emission insulation slurry. 0.2 K 1.4 Ti 6 O 13 .

[0111] Comparative Example 3

[0112] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth prepared in this embodiment are different from those in Example 1 in that La is not added to the heat-absorbing slurry. 0.05 W 0.02 V 0.93 O 2 .

[0113] Comparative Example 4

[0114] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth prepared in this embodiment are different from those in Example 1 in that potassium hexatitanate K is added to the emission heat insulation slurry. 1.4 Ti 6 O 13 .

[0115] Comparative Example 5

[0116] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth prepared in this embodiment are different from those in Example 1 in that tungsten-doped vanadium dioxide W is added to the heat-absorbing slurry. 0.02 V 0.93 O 2 .

[0117] Comparative Example 6

[0118] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth prepared in this embodiment are different from those in Example 1 in that: lanthanum-doped vanadium dioxide La is added to the heat-absorbing slurry. 0.05 V 0.93 O 2 .

[0119] Comparative Example 7

[0120] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth prepared in this embodiment are different from those in Example 1 in that no titanate (barium titanate and strontium titanate) is added to the emission insulation slurry.

[0121] Comparative Example 8

[0122] The preparation method and raw material component ratio of the rare earth-based fabric with dual functions of heat insulation and warmth preservation prepared in this embodiment are different from those in Example 1 in that:

[0123] La is added to the launch insulation slurry 0.3 K 1.1 Ti 6 O 13 , weigh lanthanum chloride, potassium carbonate and titanium dioxide according to the molar ratio of La:K:Ti=0.3:1.1:6.

[0124] La is added to the endothermic slurry 0.3 W 0.03 V 0.67 O 2 , weigh lanthanum carbonate, ammonium tungstate and vanadium pentoxide according to the molar ratio of La:W:V=0.3:0.03:67.

[0125] After irradiating the rare earth-based fabrics prepared in Examples 1 to 7 and Comparative Examples 1 to 8 for 20 minutes, their heat insulation (A side facing the light source) and heat storage (B side facing the light source) temperature rise performances were tested. The test results are as follows:

[0126] Table 1 Comparison of temperature rise performance of fabrics of the embodiment and the comparative example

[0127]

[0128] Comparative Example 1-Example 8 and Comparative Example 1-Comparative Example 8 fabric temperature rise performance test, see Table 1, when the A side is facing the light source to test its thermal insulation performance, compared with Comparative Example 1, the maximum temperature rise of Examples 1-Example 8 is reduced, and the average temperature difference can reach 4.3°C, which is because the A side of the fabric can reflect most of the energy in the visible-near infrared band, which has the effect of heat insulation and cooling. When the B side is facing the light source to test its thermal storage performance, compared with Comparative Example 1, the maximum temperature rise of Examples 1-Example 8 is increased, and the average temperature difference can reach 6.7°C, which is because the B side of the fabric can absorb the energy in the visible-near infrared band and emit far infrared rays inward, which has the effect of heat storage and heat preservation. Comparing Example 1, Comparative Example 4 and Comparative Example 5, it can be found that the thermal insulation and thermal storage performance of the fabric not doped with rare earth are reduced to varying degrees, which is due to the unique 4f valence electron structure of rare earth ions regulating the emissivity and absorptivity of the visible-near infrared band.

[0129] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rare earth-based fabric with dual functions of heat insulation and warmth preservation, characterized in that: The rare earth-based fabric comprises an A surface and a B surface, wherein the A surface is an emitting heat-insulating fiber layer prepared from an emitting heat-insulating slurry and a high molecular polymer as raw materials, and the B surface is an absorbing heat-absorbing fiber layer prepared from an absorbing heat-insulating slurry and a high molecular polymer as raw materials; the emitting heat-insulating slurry comprises rare earth-doped potassium hexatitanate and titanate, and the absorbing heat-absorbing slurry comprises vanadium dioxide co-doped with rare earth and tungsten; The structural formula of the rare earth doped potassium hexatitanate is Re m K 2-3m Ti6O 13 , wherein Re is a rare earth element selected from one or more of lanthanum, cerium, yttrium, and europium, 0.01 <m≤0.2; The preparation method of rare earth doped potassium hexatitanate comprises the following steps: (1) mixing potassium carbonate, titanium dioxide and a first rare earth source according to a molar ratio; (2) ball milling the mixture in a planetary ball mill using deionized water as a medium for 6-24 hours, and then drying at a temperature of 80-110° C. for 10-24 hours; (3) calcining the dried mixture in a muffle furnace at a temperature of 800-1200° C. for 6-48 hours to obtain rare earth-doped potassium hexatitanate powder; The structural formula of the rare earth and tungsten co-doped vanadium dioxide is Re x W y V z O2, where Re is a rare earth element selected from one or more of lanthanum, cerium, and neodymium, 0.01 < x < 0.2, 0.01 < y ≤ 0.02, 0.75 < z < 1; The preparation method of the rare earth and tungsten co-doped vanadium dioxide includes the following steps: a. Add vanadium pentoxide, ammonium tungstate and the second rare earth source to a mixed solution of deionized water and anhydrous ethanol in a molar ratio, and then add acid to adjust the pH of the solution to 4-6; b. After subjecting the mixed solution of step a to ultrasonic treatment for 0.5-2h, the mixed solution is transferred to a hydrothermal reactor and reacted at 180-240°C for 24-72h; c. After washing, the mixture is dried at 80-100° C. for 10-16 hours, and then placed in a tubular furnace filled with argon gas and calcined at 450-700° C. for 2-4 hours to obtain rare earth and tungsten co-doped vanadium dioxide powder.

2. The rare earth-based fabric with dual functions of heat insulation and warmth preservation according to claim 1, characterized in that: The first rare earth source is a rare earth carbonate or a rare earth chloride, wherein the rare earth carbonate is selected from one or a mixture of two or more of lanthanum carbonate, cerium carbonate, yttrium carbonate, and europium carbonate; the rare earth chloride is selected from one or a mixture of two or more of lanthanum chloride, cerium chloride, yttrium chloride, and europium chloride; and the titanate is one or a mixture of two or more of barium titanate, strontium titanate, calcium titanate, and zinc titanate.

3. The rare earth-based fabric with dual functions of heat insulation and warmth preservation according to claim 1, characterized in that: The emission heat insulation slurry is prepared from the following components in parts by weight: 20-50 parts by weight of rare earth doped potassium hexatitanate powder, 20-40 parts by weight of titanate powder, 50-80 parts by weight of dispersion medium, 5-20 parts by weight of surfactant, 1-5 parts by weight of anti-aging agent, and 0.5-2 parts by weight of defoaming agent; The method for preparing the emission insulation slurry comprises the following steps: Rare earth doped potassium hexatitanate powder, titanate powder, dispersion medium, surfactant, anti-aging agent and defoamer are mixed and dispersed evenly with a disperser, and then ultrasonicated for 1h-5h and then put into a sand mill for 3-8h to obtain an emission insulation slurry with a particle size D90 of 200-500nm.

4. The rare earth-based fabric with dual functions of heat insulation and warmth preservation according to claim 1, characterized in that: The second rare earth source is a rare earth carbonate or a rare earth chloride, wherein the rare earth carbonate is selected from one or a mixture of two or more of lanthanum carbonate, cerium carbonate, and neodymium carbonate; and the rare earth chloride is selected from one or a mixture of two or more of lanthanum chloride, cerium chloride, and neodymium chloride.

5. The rare earth-based fabric with dual functions of heat insulation and warmth preservation according to claim 3, characterized in that: The endothermic slurry is prepared from the following components in parts by weight: 10-50 parts by weight of rare earth and tungsten co-doped vanadium dioxide powder, 50-80 parts by weight of dispersion medium, 5-15 parts by weight of surfactant, 1-5 parts by weight of anti-aging agent, and 0.5-2 parts by weight of defoaming agent; The preparation method of the endothermic slurry comprises the following steps: The endothermic slurry, dispersion medium, surfactant, anti-aging agent and defoaming agent are mixed and dispersed evenly with a disperser, and then ultrasonicated for 1-5 hours and then put into a sand mill for 4-9 hours to obtain the endothermic slurry with a particle size D90 of 200-500nm.

6. The rare earth-based fabric with dual functions of heat insulation and warmth preservation according to claim 5, characterized in that: The dispersion medium in the emission heat insulation slurry and the heat absorption slurry is independently selected from one or a mixture of two or more of deionized water, isopropyl alcohol, ethyl acetate, and propylene glycol methyl ether acetate; The surfactants in the emission heat insulation slurry and the heat absorption slurry are independently selected from one or a mixture of two or more of sodium dodecyl sulfate, silane coupling agent KH560, polyethylene glycol, sodium polyacrylate, sodium carboxymethyl cellulose, and alkyl polyglucoside; The anti-aging agents in the emission heat insulation slurry and the heat absorption slurry are independently selected from one or a mixture of two or more of butylated hydroxyanisole, bis(2,2,6,6-tetramethylpiperidinium)dehydroacetic acid, and 2-hydroxy-4-methoxyphenylbenzenetrione; The defoamers in the emission insulation slurry and the endothermic slurry are independently selected from BYK111, DF 892, FoamStarA10, or a mixture of two or more thereof; The high molecular polymer is one or a mixture of two or more of polybutylene terephthalate, polyurethane, ethylene terephthalate and polystyrene.

7. The method for preparing the rare earth-based fabric with dual functions of heat insulation and warmth preservation according to any one of claims 1 to 6, characterized in that: The steps include: S1, preparing an emission heat insulation fiber by hot mixing, granulating and spinning 30-60 parts by mass of emission heat insulation slurry and 50-80 parts by mass of high molecular polymer; S2, preparing heat-absorbing fibers by hot mixing, granulating and spinning 10-60 parts by mass of heat-absorbing slurry and 40-80 parts of high molecular polymer; S3. The emitting heat-insulating fibers and the absorbing heat-insulating fibers are woven into cloths by looms respectively, and rare earth-based fabrics with dual functions of heat insulation and warmth retention are prepared by hot pressing.

8. Use of the rare earth-based fabric with dual functions of heat insulation and warmth preservation according to any one of claims 1 to 6 in the preparation of outdoor tents.

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