Composite thermal insulation material and process thereof

Abstract

The invention relates to the technical field of composite thermal insulation materials, and discloses a composite thermal insulation material and a process thereof, a composite structure is adopted, and the composite thermal insulation material is prepared through the ultralow thermal conductivity of aerogel, the supporting thermal insulation effect of polyurethane foam and the heat absorption and heat release functions of phase change microcapsules. The composite warm-keeping material can effectively block heat transfer at different environment temperatures, a hollow hole type hot melt gluing structure is adopted, breathable vacancies are reasonably arranged according to functional use requirements, the heat preservation characteristic of the composite fabric is guaranteed, and meanwhile the fabric can have good breathability; the cold pressing roller and the air cooling box base which are arranged on the rear portion of the hot pressing composite roller are used for cooling the fabric subjected to hot melting composite, the situation that the composite fabric is separated due to conveying tension can be avoided, and the composite stability of the fabric can be effectively improved; and the fabric can be efficiently and rapidly cooled through secondary air cooling, and heat accumulation and adhesion of the rolled fabric can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of composite thermal insulation materials, in particular to a composite thermal insulation material and a process thereof. Background Art

[0002] As people's demands for a better quality of life rise, the need to stay warm and comfortable in cold environments is increasing. While traditional thermal insulation materials like down and cotton offer some thermal performance, they have limitations. Down products can bleed, and some people are allergic to down. Cotton insulation's thermal performance decreases significantly in humid environments. Composite materials are formed by combining different materials to create a complex structure. Through compounding, the advantages of multiple fabrics can be combined to create a new fabric with superior properties. These newly formed materials offer significant performance improvements or differ from the original components, meeting the functional requirements of different products.

[0003] Although composite thermal insulation materials have overcome some of the defects of natural materials, the air permeability of the composite thermal insulation materials is greatly reduced due to the hot melt adhesive layer structure between the composite structures, and there is still room for improvement in terms of thermal insulation effect, air permeability, and lightness. Therefore, a composite thermal insulation material and its process are proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite thermal insulation material and a process thereof to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a composite thermal insulation material comprising a base surface layer, a thermal insulation surface layer, and a functional surface layer, wherein the composite sides of the base surface layer, the thermal insulation surface layer, and the functional surface layer are all provided with a hot melt adhesive layer, wherein the base surface layer, the thermal insulation surface layer, and the functional surface layer are sequentially and integrally composited and connected by the hot melt adhesive layer, and the middle portion of the hot melt adhesive layer is evenly provided with air permeable spaces;

[0006] The base surface layer is arranged on the bottom layer of the composite thermal insulation material, and the base surface layer is a polymer fiber fabric with good flexibility and strength;

[0007] The thermal insulation surface layer is arranged on the upper layer of the base surface layer, and the thermal insulation surface layer is composited by aerogel material and polyurethane foam;

[0008] The functional surface layer is arranged on the upper layer of the thermal insulation surface layer, and the functional surface layer is formed by weaving a mixture of microcapsules containing phase change materials and hygroscopic fibers.

[0009] A process for preparing a composite thermal insulation material comprises the following steps:

[0010] S1. Preparation of base layer: Polyester fiber filaments are produced through a spinning process, and then the filaments are woven into a plain or twill weave. The density and thickness of the fabric are adjusted according to different uses and performance requirements. The woven polyester fiber fabric undergoes finishing processes such as desizing, refining, and dyeing to improve the softness, glossiness, and color fastness of the fabric;

[0011] S2. Preparation of thermal insulation layer: preparing aerogel and polyurethane foam in sequence, and then combining the prepared silica aerogel and polyurethane foam by vacuum adsorption and hot pressing to obtain a thermal insulation surface layer;

[0012] S3. Preparation of functional layer: Phase change microcapsules and hygroscopic fibers are prepared in sequence, and then the treated hygroscopic fibers and phase change microcapsules are mixed in a certain proportion and woven into a functional surface layer through a textile process;

[0013] S4. Overall compounding: Compounding the prepared base surface layer, thermal insulation surface layer and functional surface layer through a compounding mechanism, so that each layer is firmly bonded to form the final composite thermal insulation material.

[0014] Preferably, the above S2 includes the following sub-steps:

[0015] S201, aerogel preparation: using tetraethyl orthosilicate as a silicon source, a sol-gel method is used to prepare silica aerogel, wherein tetraethyl orthosilicate, ethanol, water and an acidic catalyst are mixed in a certain proportion, stirred at room temperature to form a sol, and then the sol is poured into a mold, and a gelation reaction is carried out under certain conditions of 50-70° C. and 40%-60% relative humidity to form a silica wet gel, the wet gel is aged, and then multiple solvent exchanges are carried out with ethanol to remove moisture in the gel, and finally the gel is placed in a supercritical drying equipment and dried under supercritical carbon dioxide conditions to obtain silica aerogel;

[0016] S202, polyurethane foam preparation: polyether polyol, isocyanate, blowing agent, and catalyst raw materials are mixed in a certain proportion, stirred evenly, and poured into a mold for foaming reaction, the foaming temperature is controlled at 25-35° C., and the foaming time is determined according to the foam thickness and density requirements, which is 1-3 hours, to obtain polyurethane foam;

[0017] S203. Composite insulation layer: first place the polyurethane foam in a mold, then evenly spread the aerogel on the surface of the foam, put it into a vacuum oven, and evacuate the air at a vacuum degree of 0.08-0.1MPa and a temperature of 80-100°C for 1-2 hours to fully fit the aerogel and the polyurethane foam. Then perform hot pressing treatment at a hot pressing temperature of 120-150°C, a pressure of 0.1-0.3MPa, and a hot pressing time of 5-10 minutes to further consolidate the combination of the two and obtain a thermal insulation surface layer.

[0018] Preferably, the above S3 includes the following sub-steps:

[0019] S301, preparation of phase change microcapsules: heating and melting a paraffin phase change material, adding an emulsifier and water, and forming an emulsion under high-speed stirring, then slowly adding a melamine resin prepolymer dropwise to the emulsion, continuing stirring and raising the temperature to 70-90° C., reacting for 3-5 hours to allow the melamine resin to polymerize on the surface of the phase change material droplets to form microcapsules. After the reaction is completed, cooling, filtering, and washing are performed to obtain phase change microcapsules;

[0020] S302. Hygroscopic fiber processing: Anti-pilling treatment and hydrophilic finishing are performed on polyacrylonitrile-based hygroscopic fibers. The fibers are immersed in an anti-pilling agent solution for 30-60 minutes, then dried. The fibers are then immersed in a hydrophilic finishing agent solution at a temperature of 40-50°C for 1-2 hours, and then dried.

[0021] S303. Functional layer weaving: The treated hygroscopic fibers are mixed with phase change microcapsules in a certain proportion, and are weaved by warp knitting or weft knitting. The structure and density of the fabric are adjusted as needed to produce a functional surface layer with good hygroscopicity and phase change temperature regulation functions.

[0022] Preferably, the composite mechanism described in S4 above includes a supporting frame, a feeding roller, a winding roller, a hot pressing composite roller, a coating assembly and a cooling assembly, wherein the feeding roller and the winding roller are rotatably mounted on the front and rear sides of the supporting frame respectively, and the hot pressing composite rollers arranged in pairs are rotatably mounted in the middle of the supporting frame in an opposing manner, and the coating assembly and the cooling assembly are respectively arranged on the feeding side and the discharging side of the hot pressing composite roller.

[0023] Preferably, the above-mentioned feeding rollers are used for compound feeding of fabrics, and the feeding rollers are arranged in pairs. The two groups of feeding rollers are driven by a motor to rotate in an upper and lower distribution and are installed at the rear part of the supporting frame. The winding rollers are used for winding the composite fabrics, and the winding rollers are driven by a motor to rotate and are installed at the rear part of the supporting frame.

[0024] Preferably, the two groups of hot pressing composite rollers are driven by a motor to rotate in an opposing manner in the middle of the support frame, and pressurizing cylinders are installed on the rotating shaft supports on both sides of the rear hot pressing composite rollers.

[0025] Preferably, the above-mentioned coating assembly includes a hot melt material bin, a hot melt feeding roller and a hot melt coating roller. The hot melt material bin is fixedly installed on the lower feed side of the hot pressing composite roller through a bracket support. The hot melt feeding roller is driven by a motor to rotate on a fixed axis and is installed inside the hot melt material bin. The hot melt coating roller is driven by a motor to rotate on a fixed axis and is installed below the hot melt material bin. The hot melt coating roller is installed in rolling contact with the hot melt feeding roller, and empty holes are evenly arranged on the upper part of the hot melt coating roller.

[0026] Preferably, the cooling assembly includes an air-cooled box seat, a turning frame cylinder, a supporting turning frame, a cold pressing roller and a cooling jet seat. The front discharge side of the hot pressing composite roller is rotatably mounted with a cold pressing support roller. The supporting turning frame is supported and turned at the front of the cold pressing support roller through a rotating shaft. The two groups of turning frame cylinders are respectively mounted on the two lower arm sides of the supporting turning frame. The cold pressing roller is rotatably mounted on the upper part of the supporting turning frame. The cold pressing roller is installed in rolling contact with the cold pressing support roller.

[0027] Preferably, the cooling jet seat is fixedly installed on the middle part of the upper side of the supporting turning frame, the jet port of the cooling jet seat is facing the lower part of the cold pressing roller, and the air cooling box seat is fixedly installed on the rear feed side of the winding roller through the support of the bracket. Cooling fans are evenly arranged inside the air cooling box seat, and the air outlet of the air cooling box seat is facing the conveying side of the fabric.

[0028] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0029] 1. It adopts a composite structure, and each layer of material is tightly combined through a composite process, which has good wear resistance, tear resistance and durability. Through the ultra-low thermal conductivity of aerogel, the supporting and thermal insulation effect of polyurethane foam, and the heat absorption and heat release function of phase change microcapsules, this composite thermal insulation material can effectively block the transfer of heat at different ambient temperatures and achieve efficient thermal insulation effect. Polyacrylonitrile-based moisture-absorbing fiber can quickly absorb sweat discharged from the human body and diffuse it to the surface of the material to keep the skin dry. The polyester fiber fabric used in the base surface layer and the reasonable combination of each layer of material make the thermal insulation material light in weight and soft in texture. It will not bring too much burden to the human body when worn or used, thereby improving the comfort of use.

[0030] 2. A hollow hot-melt bonding structure is adopted. During the composite process, a hot-melt coating roller with vacant holes is used to coat the composite fabric. After coating, a breathable space is formed in the middle of the hot-melt bonding layer. Even if multiple layers of fabrics are composited, the breathability of the fabric can be guaranteed. Reasonable setting of the breathable space according to functional requirements can ensure the thermal insulation properties of the composite fabric while ensuring good breathability of the fabric, which can effectively improve the wearing comfort of the fabric.

[0031] 3. A double composite cooling structure is adopted, and the cold pressing roller and air cooling box seat arranged at the rear of the hot pressing composite roller are used to cool down the fabric after hot melt composite. The cold pressing roller is supported and installed at the rear of the hot pressing composite roller through a supporting turning frame. While completing the shaping and cooling of the hot melt fabric through cold pressing, it can avoid the separation of the composite fabrics due to conveying tension, which can effectively improve the composite stability of the fabric. The air cooling box seat is arranged in front of the winding roller. The secondary air cooling can cool down the fabric efficiently and quickly, which can avoid the heat accumulation and adhesion of the fabric after winding, and greatly improve the composite processing stability of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 Schematic diagram of the composite layered structure of the present invention;

[0034] Figure 2 Schematic diagram of the ventilation vacancy distribution structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the overall front structure of the composite mechanism of the present invention;

[0036] Figure 4 This is a schematic diagram of the overall rear structure of the composite mechanism of the present invention;

[0037] Figure 5 It is a schematic diagram of the planar working structure of the composite mechanism of the present invention;

[0038] Figure 6 It is a schematic diagram of the three-dimensional working structure of the composite mechanism of the present invention;

[0039] Figure 7 This is a schematic diagram of the working installation structure of the support turning frame of the present invention;

[0040] Figure 8 This is a schematic diagram of the working installation structure of the coating component of the present invention.

[0041] Explanation of the accompanying symbols: 1. Base surface layer; 2. Thermal insulation surface layer; 3. Functional surface layer; 4. Breathable space; 5. Support frame; 6. Feed roller; 7. Winding roller; 8. Hot pressing composite roller; 9. Pressurizing cylinder; 10. Hot melt material bin; 11. Hot melt feed roller; 12. Hot melt coating roller; 13. Space hole; 14. Air cooling box seat; 15. Turning frame cylinder; 16. Support turning frame; 17. Cold pressing roller; 18. Cooling jet seat. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0044] Example

[0045] See also Figure 1-8 The present invention provides a technical solution: a composite thermal insulation material, comprising a base surface layer 1, a thermal insulation surface layer 2 and a functional surface layer 3, specifically:

[0046] As attached Figure 1 As shown, the base surface layer 1 is arranged at the bottom layer of the composite thermal insulation material. The base surface layer 1 is a polymer fiber fabric with good flexibility and strength. Specifically, the base surface layer 1 can be a polyester fiber fabric with a gram weight of 50-100g / m 2 , to ensure the base stability and durability of the material;

[0047] The thermal insulation surface layer 2 is arranged on the upper layer of the base surface layer 1. The thermal insulation surface layer 2 is composed of a composite of aerogel material and polyurethane foam. Specifically, the first is the aerogel material. Aerogel has an extremely low thermal conductivity coefficient, and a large number of nano-scale pores inside it can effectively prevent heat conduction. The selected aerogel is silica aerogel, which has a purity of not less than 99%, a particle size between 10-50nm, and a porosity greater than 90%. The aerogel is composited with polyurethane foam, and the porosity of the polyurethane foam is 80%-90%, and the density is 20-30kg / m 3 This composite structure can not only take advantage of the ultra-low thermal conductivity of aerogel, but also make use of the support effect of polyurethane foam to make the thermal insulation surface layer 2 have good shape stability;

[0048] The functional surface layer 3 is arranged on the upper layer of the thermal insulation surface layer 2. The functional surface layer 3 is woven from a mixture of microcapsules containing phase change materials and hygroscopic fibers. Specifically, the core material of the phase change microcapsules is a paraffin-based phase change material with a phase change temperature range of 25-35°C. It can absorb or release heat in this temperature range to regulate the temperature. The shell material of the microcapsules is melamine resin with a wall thickness of 1-3μm to ensure the stability and durability of the microcapsules. The hygroscopic fibers are polyacrylonitrile-based hygroscopic fibers with a moisture regain of 8%-12%. They can quickly absorb sweat discharged from the human body and convert the absorbed heat into thermal energy through synergistic action with the phase change microcapsules, further enhancing the warmth effect.

[0049] The composite sides of the base surface layer 1, the thermal insulation surface layer 2 and the functional surface layer 3 are all provided with a hot-melt adhesive layer. The base surface layer 1, the thermal insulation surface layer 2 and the functional surface layer 3 are sequentially compositely connected through the hot-melt adhesive layer, and a composite structure is adopted. The materials of each layer are tightly combined through a composite process, and have good wear resistance, tear resistance and durability. Through the ultra-low thermal conductivity of aerogel, the supporting thermal insulation effect of polyurethane foam and the heat absorption and heat release function of phase change microcapsules, this composite thermal insulation material can effectively block the transfer of heat at different ambient temperatures and achieve efficient thermal insulation effect. The polyacrylonitrile-based moisture-absorbing fiber can quickly absorb sweat discharged from the human body and diffuse it to the surface of the material to keep the skin dry. The polyester fiber fabric used in the base surface layer 1 and the reasonable composite of the materials of each layer make the thermal insulation material light in weight and soft in texture. It will not bring too much burden to the human body when worn or used, thereby improving the comfort of use. Figure 2 As shown, after processing, breathable spaces 4 are evenly arranged in the middle of the hot-melt adhesive layer. Even if multiple layers of fabric are composited, the breathability of the fabric can be guaranteed. The breathable spaces 4 are reasonably arranged according to functional requirements to ensure the thermal insulation properties of the composite fabric while allowing the fabric to have good breathability, which can effectively improve the wearing comfort of the fabric.

[0050] A process for preparing a composite thermal insulation material comprises the following steps:

[0051] S1. Preparation of base layer: Polyester fiber filaments are produced through a spinning process, and then the filaments are woven into a plain or twill weave. The density and thickness of the fabric are adjusted according to different uses and performance requirements. The woven polyester fiber fabric undergoes finishing processes such as desizing, refining, and dyeing to improve the softness, glossiness, and color fastness of the fabric;

[0052] S2, preparation of thermal insulation layer: preparing aerogel and polyurethane foam in sequence, and then combining the prepared silica aerogel and polyurethane foam by vacuum adsorption and hot pressing to obtain thermal insulation surface layer 2;

[0053] Specifically, S2 includes the following sub-steps:

[0054] S201. Aerogel preparation: Silica aerogel is prepared using tetraethyl orthosilicate as a silicon source by a sol-gel method. Tetraethyl orthosilicate, ethanol, water, and an acidic catalyst are mixed in a certain proportion and stirred at room temperature to form a sol. The sol is then poured into a mold and subjected to a gelation reaction at a certain temperature of 55° C. and a relative humidity of 50% to form a wet silica gel. The wet gel is then aged, and then solvent exchanged with ethanol is performed multiple times to remove moisture from the gel. Finally, the gel is placed in a supercritical drying device and dried under supercritical carbon dioxide conditions to obtain a silica aerogel.

[0055] S202, polyurethane foam preparation: polyether polyol, isocyanate, blowing agent, and catalyst raw materials are mixed in a certain proportion, stirred evenly, and poured into a mold for foaming reaction, the foaming temperature is controlled at 30° C., and the foaming time is determined according to the foam thickness and density requirements, which is 2 hours, to obtain polyurethane foam;

[0056] S203, composite thermal insulation layer: first place the polyurethane foam in a mold, then evenly spread the aerogel on the surface of the foam, put it into a vacuum oven, and evacuate the air at a vacuum degree of 0.1 MPa and a temperature of 90°C for 2 hours to fully fit the aerogel and the polyurethane foam. Then, perform hot pressing treatment at a hot pressing temperature of 130°C, a pressure of 0.3 MPa, and a hot pressing time of 8 minutes to further consolidate the combination of the two and obtain the thermal insulation surface layer 2.

[0057] S3, functional layer preparation: phase change microcapsules and hygroscopic fibers are prepared in sequence, and then the treated hygroscopic fibers and phase change microcapsules are mixed in a certain proportion and woven into a functional surface layer 3 by a textile process;

[0058] Specifically, S3 includes the following sub-steps:

[0059] S301, preparation of phase change microcapsules: heating and melting a paraffin phase change material, adding an emulsifier and water, and forming an emulsion under high-speed stirring, then slowly adding a melamine resin prepolymer dropwise to the emulsion, continuing stirring and raising the temperature to 80° C., and reacting for 4 hours to allow the melamine resin to polymerize on the surface of the phase change material droplets to form microcapsules. After the reaction is completed, cooling, filtering, and washing are performed to obtain phase change microcapsules;

[0060] S302. Hygroscopic fiber processing: Anti-pilling treatment and hydrophilic finishing are performed on polyacrylonitrile-based hygroscopic fibers. The fibers are immersed in an anti-pilling agent solution for 50 minutes, then dried. The fibers are then immersed in a hydrophilic finishing agent solution at a temperature of 50°C for 1.5 hours, and then dried.

[0061] S303, functional layer weaving: the treated hygroscopic fibers and phase change microcapsules are mixed in a certain proportion, and weaved by warp knitting or weft knitting. The structure and density of the fabric are adjusted as needed to produce a functional surface layer 3 with good hygroscopicity and phase change temperature regulation function.

[0062] S4, overall compounding: the prepared base surface layer 1, thermal insulation surface layer 2 and functional surface layer 3 are compounded through a compounding mechanism to make the layers firmly bonded to form the final composite thermal insulation material. Specifically, the compounding mechanism includes a support frame 5, a feeding roller 6, a winding roller 7, a hot pressing compounding roller 8, a coating component and a cooling component, as shown in the attached Figure 4 As shown, the feeding roller 6 and the winding roller 7 are rotatably installed on the front and rear sides of the support frame 5 respectively. The feeding roller 6 is used for compound feeding of the fabric. The feeding roller 6 is arranged in pairs. The two groups of feeding rollers 6 are driven by a motor to rotate and are installed on the rear part of the support frame 5 in an upper and lower distribution. The winding roller 7 is used for winding the composite fabric. The winding roller 7 is driven by a motor to rotate and is installed on the rear part of the support frame 5.

[0063] The hot pressing composite rollers 8 are arranged in pairs and are rotatably mounted on the middle part of the support frame 5. Figure 5 As shown, two sets of hot pressing composite rollers 8 are driven by a motor to rotate in an opposing manner and are installed in the middle of the support frame 5, which is used for hot pressing composite of fabrics. In order to provide hot pressing pushing force, pressure cylinders 9 are installed on the rotating shaft support sides on both sides of the rear hot pressing composite roller 8. The pressure cylinders 9 are hydraulic cylinders that can control the pressing force of the hot pressing composite roller 8 by pushing.

[0064] The coating assembly and the cooling assembly are respectively arranged on the feeding side and the discharging side of the hot pressing composite roller 8. Specifically, the coating assembly includes a hot melt material bin 10, a hot melt feeding roller 11 and a hot melt coating roller 12. Figure 5 As shown, the hot melt material bin 10 is fixedly mounted on the lower feeding side of the hot pressing composite roller 8 through a bracket support, and is used for supplying and storing hot melt materials. Figure 8As shown, the hot melt feeding roller 11 is driven by a motor to rotate on a fixed axis and is installed inside the hot melt material bin 10 for rotating supply of gluing material. The hot melt coating roller 12 is driven by a motor to rotate on a fixed axis and is installed below the hot melt material bin 10. The hot melt coating roller 12 is installed in rolling contact with the hot melt feeding roller 11. The gluing material can be evenly coated on the upper part of the hot melt coating roller 12 through the hot melt feeding roller 11. In order to realize the forming processing of the breathable space 4, vacant holes 13 are evenly provided on the upper part of the hot melt coating roller 12. A hollow hot melt gluing structure is adopted. During the composite processing, the hot melt coating roller 12 with the vacant holes 13 is used to coat the composite fabric. After coating, a breathable space 4 is formed in the middle of the hot melt bonding layer. Even if multiple layers of fabrics are composited, the breathability of the fabric can be guaranteed. The breathable space 4 is reasonably set according to the functional use requirements to ensure the thermal insulation properties of the composite fabric while allowing the fabric to have good breathability.

[0065] The cooling assembly includes an air cooling box seat 14, a tilting frame cylinder 15, a supporting tilting frame 16, a cold pressing roller 17 and a cooling air jet seat 18, as shown in the attached figure. Figure 6 As shown, in order to realize the cold pressing work, a cold pressing support roller is installed on the front discharge side of the hot pressing composite roller 8 with a fixed axis rotation. In order to realize the installation support of the cold pressing roller 17, the support turning frame 16 is turned and installed on the front of the cold pressing support roller through the rotating shaft support. The turning frame cylinder 15 is a hydraulic cylinder. Two groups of turning frame cylinders 15 are respectively installed on the two lower arm sides of the supporting turning frame 16. By pushing the supporting turning frame 16, a cold pressing thrust can be provided for the cold pressing roller 17. The cold pressing roller 17 is a solid metal roller body and is fixedly mounted. On the upper part of the supporting turning frame 16, the cold pressing roller 17 is installed in rolling contact with the cold pressing support roller. The cold pressing roller 17 and the air cooling box seat 14 arranged at the rear of the hot pressing composite roller 8 are used to cool the hot melt composite fabric. The cold pressing roller 17 is supported and installed at the rear of the hot pressing composite roller 8 through the supporting turning frame 16. While completing the shaping and cooling of the hot melt fabric, the cold pressing can avoid the separation of the composite fabrics due to the conveying tension, which can effectively improve the composite stability of the fabric. In order to achieve the cooling of the cold pressing roller 17, as shown in the attached figure, Figure 7 As shown, the cooling jet seat 18 is fixedly installed on the upper middle part of the support turning frame 16, and the cooling jet seat 18 is connected to the external compressed gas tank. The jet port of the cooling jet seat 18 is facing the lower part of the cold pressing roller 17, and the cold pressing roller 17 can be quickly cooled by blowing gas. The air cooling box seat 14 is fixedly installed on the rear feed side of the winding roller 7 through the support of the bracket. Cooling fans are evenly arranged inside the air cooling box seat 14, and the air outlet of the air cooling box seat 14 is facing the conveying side of the fabric. The fabric can be cooled efficiently and quickly through secondary air cooling, which can avoid heat accumulation and adhesion of the fabric after winding, and greatly improve the composite processing stability of the fabric.

[0066] In summary, a composite structure is adopted, and each layer of material is tightly combined through a composite process, which has good wear resistance, tear resistance and durability. Through the ultra-low thermal conductivity of aerogel, the supporting thermal insulation effect of polyurethane foam and the heat absorption and heat release function of phase change microcapsules, this composite thermal insulation material can effectively block the transfer of heat at different ambient temperatures and achieve efficient thermal insulation effect. The polyacrylonitrile-based moisture-absorbing fiber can quickly absorb sweat discharged from the human body and diffuse it to the surface of the material to keep the skin dry. The polyester fiber fabric used in the base surface layer 1 and the reasonable combination of each layer of material make the thermal insulation material light in weight and soft in texture. It will not bring too much burden to the human body when worn or used, thereby improving the comfort of use. A hollow hot-melt bonding structure is adopted. During the composite processing, a hot-melt coating roller 12 with a vacant hole 13 is used to coat the composite fabric. After coating, the hot-melt A breathable space 4 is formed in the middle of the bonding layer, which can ensure the breathability of the fabric even if multiple layers of fabric are composited. The breathable space 4 is reasonably set according to functional requirements to ensure the thermal insulation properties of the composite fabric while ensuring the fabric has good breathability, which can effectively improve the wearing comfort of the fabric. A double composite cooling structure is adopted, and the cold pressing roller 17 and the air cooling box seat 14 arranged at the rear of the hot pressing composite roller 8 are used to cool the hot-melt composite fabric. The cold pressing roller 17 is supported and installed at the rear of the hot pressing composite roller 8 by the support turning frame 16. While completing the shaping and cooling of the hot-melt fabric through cold pressing, the separation of the composite fabrics due to conveying tension can be avoided, which can effectively improve the composite stability of the fabric. The air cooling box seat 14 is set in front of the winding roller 7, and the fabric can be cooled efficiently and quickly through secondary air cooling, which can avoid heat accumulation and adhesion of the fabric after winding, greatly improving the composite processing stability of the fabric.

[0067] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be made, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be made, without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A composite thermal insulation material comprising a base surface layer (1), a thermal insulation surface layer (2) and a functional surface layer (3), characterized in that: The composite sides of the base surface layer (1), the thermal insulation surface layer (2) and the functional surface layer (3) are all provided with a hot melt adhesive layer, the base surface layer (1), the thermal insulation surface layer (2) and the functional surface layer (3) are sequentially compositely connected via the hot melt adhesive layer, and the middle of the hot melt adhesive layer is evenly provided with a breathable space (4); The base surface layer (1) is arranged on the bottom layer of the composite thermal insulation material, and the base surface layer (1) is a polymer fiber fabric with good flexibility and strength; The thermal insulation surface layer (2) is arranged on the upper layer of the base surface layer (1), and the thermal insulation surface layer (2) is formed by compounding aerogel material and polyurethane foam; The functional surface layer (3) is arranged on the upper layer of the thermal insulation surface layer (2), and the functional surface layer (3) is formed by mixing and weaving microcapsules containing phase change material and hygroscopic fibers.

2. The process of a composite thermal insulation material according to claim 1, characterized in that: The following steps are involved: S1. Preparation of base layer: Polyester fiber filaments are produced through a spinning process, and then the filaments are woven into a plain or twill weave. The density and thickness of the fabric are adjusted according to different uses and performance requirements. The woven polyester fiber fabric undergoes finishing processes such as desizing, refining, and dyeing to improve the softness, glossiness, and color fastness of the fabric; S2. Preparation of thermal insulation layer: preparing aerogel and polyurethane foam in sequence, and then combining the prepared silica aerogel and polyurethane foam by vacuum adsorption and hot pressing to obtain a thermal insulation surface layer (2); S3, functional layer preparation: preparing phase change microcapsules and hygroscopic fibers in sequence, then mixing the treated hygroscopic fibers and phase change microcapsules in a certain proportion, and weaving them into a functional surface layer (3) through a textile process; S4. Overall compounding: Compounding the prepared base surface layer (1), thermal insulation surface layer (2) and functional surface layer (3) through a compounding mechanism, so that the layers are firmly bonded to form a final composite thermal insulation material.

3. The process of a composite thermal insulation material according to claim 2, characterized in that: The S2 includes the following sub-steps: S201, aerogel preparation: using tetraethyl orthosilicate as a silicon source, a sol-gel method is used to prepare silica aerogel, wherein tetraethyl orthosilicate, ethanol, water and an acidic catalyst are mixed in a certain proportion, stirred at room temperature to form a sol, and then the sol is poured into a mold, and a gelation reaction is carried out under certain conditions of 50-70° C. and 40%-60% relative humidity to form a silica wet gel, the wet gel is aged, and then multiple solvent exchanges are carried out with ethanol to remove moisture in the gel, and finally the gel is placed in a supercritical drying equipment and dried under supercritical carbon dioxide conditions to obtain silica aerogel; S202, polyurethane foam preparation: polyether polyol, isocyanate, blowing agent, and catalyst raw materials are mixed in a certain proportion, stirred evenly, and poured into a mold for foaming reaction, the foaming temperature is controlled at 25-35° C., and the foaming time is determined according to the foam thickness and density requirements, which is 1-3 hours, to obtain polyurethane foam; S203, composite thermal insulation layer: first place the polyurethane foam in a mold, then evenly spread the aerogel on the surface of the foam, put it into a vacuum oven, and evacuate for 1-2 hours under the conditions of vacuum degree of 0.08-0.1MPa and temperature of 80-100℃ to make the aerogel and polyurethane foam fully fit together, and then perform hot pressing treatment at a hot pressing temperature of 120-150℃, a pressure of 0.1-0.3MPa, and a hot pressing time of 5-10 minutes to further consolidate the combination of the two and obtain a thermal insulation surface layer (2).

4. The process for producing a composite thermal insulation material according to claim 2, wherein: The S3 includes the following sub-steps: S301, preparation of phase change microcapsules: heating and melting a paraffin phase change material, adding an emulsifier and water, and forming an emulsion under high-speed stirring, then slowly adding a melamine resin prepolymer dropwise to the emulsion, continuing stirring and raising the temperature to 70-90° C., reacting for 3-5 hours to allow the melamine resin to polymerize on the surface of the phase change material droplets to form microcapsules. After the reaction is completed, cooling, filtering, and washing are performed to obtain phase change microcapsules; S302. Hygroscopic fiber processing: Anti-pilling treatment and hydrophilic finishing are performed on polyacrylonitrile-based hygroscopic fibers. The fibers are immersed in an anti-pilling agent solution for 30-60 minutes, then dried. The fibers are then immersed in a hydrophilic finishing agent solution at a temperature of 40-50°C for 1-2 hours, and then dried. S303, functional layer weaving: the treated hygroscopic fibers and phase change microcapsules are mixed in a certain proportion, and the mixture is knitted by warp knitting or weft knitting. The structure and density of the fabric are adjusted as needed to produce a functional surface layer (3) with good hygroscopicity and phase change temperature regulation function.

5. The process of a composite thermal insulation material according to claim 2, characterized in that: The composite mechanism described in S4 includes a support frame (5), a feed roller (6), a winding roller (7), a hot pressing composite roller (8), a coating component and a cooling component. The feed roller (6) and the winding roller (7) are rotatably mounted on the front and rear sides of the support frame (5), respectively. The hot pressing composite rollers (8) arranged in pairs are rotatably mounted in the middle of the support frame (5) in an opposed manner. The coating component and the cooling component are respectively arranged on the feed side and the discharge side of the hot pressing composite roller (8).

6. The process for producing a composite thermal insulation material according to claim 5, characterized in that: The feeding rollers (6) are used for composite feeding of fabrics. The feeding rollers (6) are arranged in pairs. The two groups of feeding rollers (6) are driven by a motor to rotate in an upper and lower distribution and are installed at the rear of the support frame (5). The winding roller (7) is used for winding the composite fabrics. The winding roller (7) is driven by a motor to rotate and is installed at the rear of the support frame (5).

7. The process for producing a composite thermal insulation material according to claim 6, characterized in that: The two groups of hot pressing composite rollers (8) are driven by a motor to rotate in an opposing manner and are installed in the middle of the support frame (5). The rotating shaft support sides of both sides of the rear hot pressing composite rollers (8) are both installed with pressurized cylinders (9).

8. The process for producing a composite thermal insulation material according to claim 5, characterized in that: The coating assembly includes a hot melt material bin (10), a hot melt feeding roller (11) and a hot melt coating roller (12); the hot melt material bin (10) is fixedly mounted on the lower feed side of the hot pressing composite roller (8) through a bracket support; the hot melt feeding roller (11) is mounted inside the hot melt material bin (10) by being driven by a motor to rotate about a fixed axis; the hot melt coating roller (12) is mounted below the hot melt material bin (10) by being driven by a motor to rotate about a fixed axis; the hot melt coating roller (12) is mounted in rolling contact with the hot melt feeding roller (11); and the upper portion of the hot melt coating roller (12) is evenly provided with vacant holes (13).

9. The process for producing a composite thermal insulation material according to claim 5, characterized in that: The cooling assembly includes an air-cooled box seat (14), a turning frame cylinder body (15), a supporting turning frame (16), a cold pressing roller (17) and a cooling jet seat (18); a cold pressing support roller is fixedly mounted on the front discharge side of the hot pressing composite roller (8); the supporting turning frame (16) is turned and mounted on the front of the cold pressing support roller via a rotating shaft; two groups of the turning frame cylinder bodies (15) are respectively mounted on the two lower arm sides of the supporting turning frame (16); the cold pressing roller (17) is fixedly mounted and rotated on the upper part of the supporting turning frame (16); and the cold pressing roller (17) is mounted in rolling contact with the cold pressing support roller.

10. The process for producing a composite thermal insulation material according to claim 9, characterized in that: The cooling jet seat (18) is fixedly installed on the middle part of the upper side of the support turning frame (16), and the jet outlet of the cooling jet seat (18) is directly opposite to the lower part of the cold pressing roller (17). The air cooling box seat (14) is fixedly installed on the rear feeding side of the winding roller (7) through the support of the bracket. Cooling fans are evenly arranged inside the air cooling box seat (14), and the air outlet of the air cooling box seat (14) is directly opposite to the conveying side of the fabric.

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