CN114368211A - Heat insulation sunshade pad for automobile - Google Patents

Heat insulation sunshade pad for automobile Download PDF

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Publication number
CN114368211A
CN114368211A CN202011093373.XA CN202011093373A CN114368211A CN 114368211 A CN114368211 A CN 114368211A CN 202011093373 A CN202011093373 A CN 202011093373A CN 114368211 A CN114368211 A CN 114368211A
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layer
heat
coating
glass wool
phase change
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Chinese (zh)
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黄晓伟
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

The invention discloses a heat-insulating sunshade pad for an automobile, which is sequentially bonded with a metal reflecting film, a tearing-resistant layer, a glass wool structure layer and a flexible heat-conducting layer from top to bottom, wherein one surface of the metal reflecting film, which is far away from the tearing-resistant layer, is uniformly coated with fluorocarbon varnish, the tearing-resistant layer is woven by high-strength yarns, one surface of the glass wool structure layer, which is bonded with the flexible heat-conducting layer, is provided with a plurality of cone bases, phase-change materials are filled in the cone bases, and the flexible heat-conducting layer is bonded with the glass wool structure layer through a bonding coating. The heat-insulating sunshade pad has an obvious effect, can keep the temperature in the vehicle below 36 ℃ and the temperature of the vehicle body below 39 ℃ at the temperature of 30 ℃, has the total thickness of not more than 1cm, can be folded, is convenient to carry and use, and is easy to popularize and apply.

Description

Heat insulation sunshade pad for automobile
Technical Field
The invention relates to the technical field of automobile sunshade pads, in particular to an automobile heat-insulation sunshade pad.
Background
The automobile is used as an outdoor activity tool of people, the probability of being irradiated by strong light from the outside is very high, the time is very long, particularly, when coming in hot summer, the automobiles of many people are parked on an open parking lot, after insolation, when the people get back to the automobile again, the temperature in the automobile is unusually high, the people cannot tolerate at all, after field test, in a certain clear day in Sichuan province, when the outside air temperature is 32 ℃, the automobile without the sunshade pad is parked in the open parking lot for 1 hour, the temperature in the automobile is measured by a thermometer, the test result is that the temperature of a cab in the automobile reaches 65 ℃ and is 33 ℃ higher than the outside air temperature, under the temperature, the people can enter the automobile only after opening the air conditioner in the automobile for a period of time, the time and the energy consumption are not only caused, but also unexpected conditions can cause dizziness, vomiting, even faint, the automobile spontaneous combustion and other hazards, and simultaneously, tests show that the temperature of the metal automobile body part of the automobile can reach over 75 ℃, and scalding is easily caused.
Therefore, in recent years, people develop various types of products for cooling automobiles, mainly use the awning, the glass heat insulation film and the heat insulation and sunshade pad as main products, and the heat insulation and sunshade pad is convenient to carry and use, low in price and good in heat insulation effect, and is popular with people all the time. According to the claims of some famous thermal insulation sunshade pad production enterprises, after the thermal insulation sunshade pad is used, the temperature difference between the inside and the outside of an automobile is within 12 ℃, generally between 6 and 7 ℃, namely when the outdoor temperature is 32 ℃, the temperature in the automobile covered with the thermal insulation sunshade pad is generally about 38 ℃, and cannot exceed 44 ℃ at most, and the thermal insulation effect is excellent.
However, the existing heat-insulating sunshade pad for the automobile still has imperfections, and the heat-insulating way can only be realized by reflecting sunlight, but can not insulate and cool the automobile body, so that the heat-insulating capability of the pad has a larger rising space. That is, the heat absorption of the vehicle body is usually neglected by the existing heat-insulating sunshade pad, even if the temperature in the vehicle is different from the outside air temperature by 6 ℃, the temperature of the metal vehicle body is at least different by more than 13 ℃, particularly, the temperature of the vehicle body can reach 20 ℃ difference, the possibility of scalding still exists, and the heat-insulating effect is still to be improved.
Disclosure of Invention
The invention aims to: aiming at the problems existing in the prior art, the heat-insulation sunshade pad for the automobile is provided to solve the problems that the heat-insulation effect of the existing heat-insulation sunshade pad is not good, and the temperature in the automobile and the temperature of the automobile body are higher.
The technical scheme adopted by the invention is as follows: the utility model provides a car is with thermal-insulated sunshade pad, from last to having bonded in proper order down metal reflective membrane, anti-tear layer, the cotton structural layer of glass and flexible heat-conducting layer, the one side that anti-tear layer was kept away from to metal reflective membrane evenly coats and has had the fluorocarbon varnish, anti-tear layer is woven with high strength yarn and is formed, the cotton structural layer of glass is equipped with a plurality of awl bases with the one side that flexible heat-conducting layer bonded, is full of phase change material in the awl base, flexible heat-conducting layer passes through adhesive coating and bonds with the cotton structural layer of glass.
Due to the arrangement of the structure, the metal reflecting film is used for reflecting most sunlight, and the fluorocarbon varnish is used for protecting the metal reflecting layer; the anti-tearing layer is used for improving the mechanical strength and durability of the heat-insulation sunshade pad on one hand, and is used for preventing energy carried by sunlight from permeating into the heat-insulation sunshade pad on the other hand, so that a heat insulation effect is achieved; the glass wool structure layer is used for heat insulation on one hand and providing a storage structure and fixing a flexible heat conduction layer for the phase change material on the other hand; the flexible heat conduction layer is used for absorbing heat and dissipating heat of the vehicle body so as to reduce the temperature in the vehicle society; the phase-change material layer is used for reducing the thermal dynamic equilibrium temperature of the flexible heat conduction layer, so that the cooling effect is more obvious.
Further, the high-strength yarn is formed by combining and twisting aramid fibers and polyester fibers, wherein the mass percentage of the aramid fibers to the polyester fibers is 2: 1.
Further, the bonding coating covers one side of the glass wool structural layer with the conical substrate.
Furthermore, the cone base is of a cone-tower-shaped dome structure and is uniformly distributed on the glass wool structure layer, and the height of the cone base is 0.2-5 mm.
Furthermore, the spraying thickness of the fluorocarbon varnish is 150-300 μm, the sputtering thickness of the metal reflecting film is 50-150 μm, and the thickness of the flexible heat conduction layer is 0.6-1 mm.
Further, the flexible heat conduction layer is composed of flexible heat conduction coating, and the flexible heat conduction coating is composed of the following raw materials in parts by weight: 38 parts of organic silicon modified acrylic resin, 8 parts of expanded graphite, 14 parts of heat conducting fiber, 6 parts of mica powder, 6 parts of transition metal composite oxide powder, 10 parts of butyl acetate, 0.7 part of fumed silica, 15 parts of diacetone alcohol, 1.3 parts of a dispersing agent and 0.7 part of a leveling agent.
Further, the phase change material is a solid-liquid phase change material, and the phase change temperature of the solid-liquid phase change material is 31-36 ℃.
The invention also comprises a preparation method of the heat-insulating sunshade pad for the automobile, which comprises the following steps:
step 1, weaving high-strength yarns, combining and twisting 42-58 aramid fibers and 21-29 polyester fibers into the high-strength yarns according to the mass percentage of 2:1, and weaving the high-strength yarns into anti-tear layers;
step 2, dipping the obtained anti-tear layer in silica sol, standing for gelation, taking out after 10 hours, and drying in a constant-temperature drying oven at 60 ℃ to obtain the anti-tear layer after gel treatment for later use;
step 3, sputtering a metal reflecting film on one surface of the anti-tearing layer, then spraying fluorocarbon varnish on the formed metal reflecting film, and drying for later use;
step 4, manufacturing a glass wool forming die, and pressing glass wool into a glass wool structural layer with a conical substrate on one surface for later use;
step 5, spraying sealant on one surface of the glass wool structural layer with the conical substrate, forming a sealing layer on the surface of the glass wool structural layer, and drying for later use;
step 6, manufacturing a solid-liquid phase change material, heating the solid-liquid phase change material to be in a liquid phase, placing the liquid phase change material in a cone substrate of the glass wool structural layer, wherein the depth of the liquid phase change material in the cone substrate does not exceed the height of the cone substrate, and then placing the glass wool structural layer in a vacuum box for air cooling to room temperature;
step 7, manufacturing a flexible heat-conducting coating, adding organic silicon modified acrylic resin and a dispersing agent into a reactor, then stirring the mixed components by a stirrer at the rotating speed of 800r/min until the mixed components are uniformly dispersed to obtain a base material, then sequentially adding carbon fiber filaments, expanded graphite, mica powder, fumed silica and transition metal composite oxide powder into the base material, then adding butyl acetate and diacetone alcohol, and fully stirring the mixture by the stirrer at the stirring speed of 1000r/min until the mixed components are uniformly dispersed to obtain an initial coating;
step 8, adding metal fiber wires and a leveling agent into the initial coating obtained in the step 7, uniformly dispersing the mixture by using a dispersion machine to obtain an uncured coating, pumping the uncured coating into a storage tank of an air spray gun, spraying the uncured coating on the surface, provided with the cone substrate, of the glass wool structural layer obtained in the step 6 by using the air spray gun, standing the coating until the coating is leveled, putting the coating into a high-temperature oven, baking the coating in vacuum at 140 ℃ to form a film, keeping the temperature for 10min, and cooling the coating to room temperature along with the oven to obtain an initial heat-insulating sunshade pad;
and 9, bonding and fixing the surface without the metal reflecting film of the anti-tearing layer obtained in the step 3 and the surface without the flexible heat-conducting coating of the initial heat-insulation sunshade pad obtained in the step 7 by using a bonding agent to obtain the heat-insulation sunshade pad.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the heat-insulating sunshade pad has the advantages of wide raw material sources, simple and convenient processing and low manufacturing cost, and is suitable for industrial large-scale production;
2. the anti-tear layer is woven by high-strength yarns, so that the mechanical strength of the heat-insulation sunshade pad can be greatly improved, and meanwhile, after the anti-tear layer is soaked by silica sol, silica gel is filled in gaps of the anti-tear layer, so that the anti-tear layer has remarkable heat-insulation performance, flame-retardant performance and waterproof performance, and the quality of the heat-insulation sunshade pad is integrally improved;
3. due to the arrangement of the flexible heat conduction layer and the phase-change material, the heat-insulation sunshade pad has the functions of heat insulation and sunshade, has the functions of heat absorption and heat dissipation, can greatly reduce the temperature of the vehicle body, keeps the temperature of the vehicle body in a low state, avoids the risk of scalding, and further improves the performance of the heat-insulation sunshade pad;
4. the heat-insulating sunshade pad has remarkable effect, can keep the temperature in the vehicle below 36 ℃ (generally about 33 ℃) and the temperature of the vehicle body below 39 ℃ (generally about 35 ℃), has the total thickness not more than 1cm, can be folded, is convenient to carry and use, and is easy to popularize and apply.
Drawings
FIG. 1 is a schematic view of a heat and sun pad of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
fig. 3 is an enlarged schematic view of a partial structure of the flexible heat-conducting layer.
The labels in the figure are: the composite material comprises a fluorocarbon varnish 1, a metal reflecting film 2, a tear-resistant layer 3, a glass wool structure layer 4, a phase-change material 5, a flexible heat-conducting layer 6, metal fiber filaments 61, carbon fiber filaments 62, expanded graphite 63, transition metal composite oxide powder 64 and a bonding coating 7.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in fig. 1 and 2, a car is with thermal-insulated sunshade pad, from last to having bonded metal reflective membrane 2 down in proper order, tear-resistant layer 3, glass wool structural layer 4 and flexible heat-conducting layer 6, the even coating of one side that anti tear-resistant layer 3 was kept away from to metal reflective membrane 2 has fluorocarbon varnish 1, tear-resistant layer 3 is woven with high strength yarn and is formed, glass wool structural layer 4 is equipped with a plurality of awl bases with the one side that flexible heat-conducting layer 6 bonds, fill phase change material 5 in the awl base, flexible heat-conducting layer 6 passes through adhesive coating 7 and glass wool structural layer bonding.
The cotton structural layer 4 of glass, glass are cotton to have thermal-insulated heat preservation effect well, still have toughness and stability well simultaneously, when being used for thermal-insulated sunshade pad with this, can play good thermal-insulated heat preservation effect on the one hand, and on the other hand can strengthen thermal-insulated sunshade pad's mechanical properties, makes it the structure more stable, is difficult for taking place to warp. The reason why one side of the glass wool structural layer 4 is provided with the cone base is that on one hand, the cone base is filled with the phase-change material 5, on the other hand, the convex part of the cone base is connected with the flexible heat conduction layer 6, and the flexible heat conduction layer 6 is firmly combined and is not easy to separate. More specifically, the cone base is a cone-tower-shaped dome structure uniformly distributed on the glass wool structural layer 4, and the height of the cone base is 0.2-5mm (preferably 0.2mm, and also 0.2mm or 5mm can be selected).
The anti-tearing layer 3 is woven by high-strength yarns, the high-strength yarns are formed by combining and twisting aramid fibers and polyester fibers, the aramid fibers have the characteristics of high elongation, strong tensile force, heat resistance, acid and alkali resistance and the like, the polyester fibers have the characteristics of high strength, good elasticity, heat resistance, acid and alkali resistance and the like, the aramid fibers and the polyester fibers are combined for use, the advantages are complementary, the high-strength yarns not only have good stability, but also have high-strength elasticity and tear resistance, the strength is high, and the anti-tearing is not easy to tear. Furthermore, the mass percentage of the aramid fiber to the polyester fiber is 2:1, so that the high-strength yarn mainly has the advantages of the aramid fiber.
The flexible heat conduction layer 6 is used for directly contacting with the vehicle body to absorb heat and dissipate heat to the vehicle body, and the temperature of the vehicle body is reduced, more specifically, the flexible heat conduction layer 6 is composed of flexible heat conduction coating, and the flexible heat conduction coating is composed of the following raw materials in parts by weight: 34-39 parts of organic silicon modified acrylic resin, 7-9 parts of expanded graphite, 12-15 parts of heat conducting fiber filaments, 6-8 parts of mica powder, 5-7 parts of transition metal composite oxide powder, 9-11 parts of butyl acetate, 0.5-1 part of fumed silica, 12-17 parts of diacetone alcohol, 1-1.5 parts of a dispersing agent and 0.5-1 part of a flatting agent.
In this embodiment, the flexible heat-conducting coating may be composed of the following raw materials in parts by weight: the material consists of the following raw materials in parts by weight: 34-39 parts of organic silicon modified acrylic resin, 7-9 parts of expanded graphite, 12-15 parts of heat conducting fiber filaments, 6-8 parts of mica powder, 5-7 parts of transition metal composite oxide powder, 9-11 parts of butyl acetate, 0.5-1 part of fumed silica, 12-17 parts of diacetone alcohol, 1-1.5 parts of a dispersing agent and 0.5-1 part of a flatting agent; the flexible heat-conducting coating can also consist of the following raw materials in parts by weight: 39 parts of organic silicon modified acrylic resin, 9 parts of expanded graphite, 15 parts of heat conducting fiber, 8 parts of mica powder, 7 parts of transition metal composite oxide powder, 11 parts of butyl acetate, 1 part of fumed silica, 17 parts of diacetone alcohol, 1.5 parts of a dispersing agent and 1 part of a flatting agent; preferably, the flexible heat-conducting coating consists of the following raw materials in parts by weight: 38 parts of organic silicon modified acrylic resin, 8 parts of expanded graphite, 14 parts of heat conducting fiber, 6 parts of mica powder, 6 parts of transition metal composite oxide powder, 10 parts of butyl acetate, 0.7 part of gas-phase silicon dioxide, 15 parts of diacetone alcohol, 1.3 parts of a dispersing agent and 0.7 part of a flatting agent.
In the above, the silicone modified acrylic resin is prepared by copolymerizing a vinyl organosiloxane monomer and an acrylate monomer, and has excellent properties of high temperature resistance, weather resistance, good flexibility, strong adhesion, and the like, and when the silicone modified acrylic resin is used as a base material of a flexible heat conduction coating, the base material can have good heat conduction, flexibility and stability, in the embodiment, the silicone acrylic resin containing hydroxyl groups is selected, the solid content is 50%, and the silicon content is 40%.
The expanded graphite is used as a heat-conducting reinforcing filler, and is mainly used as a heat-conducting block in the embodiment due to excellent heat conductivity and flexibility so as to form a heat-conducting transfer station, so that heat in the flexible heat-conducting coating can be rapidly discharged, and the heat radiation performance of the flexible heat-conducting coating is enhanced. Preferably, the expanded graphite is small-particle expanded graphite with the mesh number of more than 325 meshes and preferably less than 400 meshes.
The heat-conducting fiber wire comprises a metal fiber wire and a carbon fiber wire, the mass percentage of the metal fiber wire to the carbon fiber wire is 4:1, after two different types of heat-conducting fiber wires are blended, the uniform distribution of the fiber wires can be improved, a three-dimensional network heat-conducting path can be further formed, as shown in figure 3, a long and thin metal fiber wire 61 is used as a main channel, a carbon fiber wire 62 is used as a branch and a lap bridge, a continuous and uninterrupted network-shaped heat-conducting path can be formed in the coating, when the coating is heated, heat can be dispersed at each part of the coating through the latticed heat-conducting fiber wires in the coating, the heat is subjected to heat exchange with objects around the coating after being dispersed, the purpose of heat dissipation is further achieved, the comprehensive use of the long and short fiber wires is realized, and the problems that lap blind areas and uneven dispersion are easy to occur to the fiber wires with a single specification are overcome, the technical difficulties that the network fiber is difficult to form and the network fiber is easy to break and is not continuous are solved, meanwhile, the formed three-dimensional network fiber yarn is beneficial to the increase of the flexibility of the coating, so that the coating is not easy to crack, fold, crack and the like when being stretched, compressed, expanded with heat and contracted with cold, the compression deformation rate is extremely low, the cured base material is not easy to fall off, and the stability is enhanced.
In this embodiment, the metal fiber filament 61 may be one or a mixture of brass fiber, stainless steel fiber, carbon steel fiber, aluminum fiber and aluminum alloy fiber, preferably brass fiber with good thermal conductivity, more specifically, the diameter of the brass fiber filament is 40-80 μm, 50-60 μm is the main filament diameter, and the length-diameter ratio is 40-60:1, so as to ensure that the brass fiber filament has good thermal conductivity and toughness. The carbon fiber filaments are fine short pitch carbon fiber filaments, the diameter of each filament is 10-15 mu m, and the length-diameter ratio of each filament is 2-3:1, so that the carbon fiber filaments can form good lap-jointed bridges among the brass fiber filaments.
The mica powder can form basically parallel orientation arrangement in the coating under the action of surface tension, the permeation of corrosive substances such as water, engine oil and the like to a formed flexible heat conducting layer is blocked, the corrosion resistance of the coating is improved, meanwhile, the mica powder can bear tensile stress, the adhesive force of the coating is increased, the heat radiation and the mechanical property of the coating are improved, the mica powder is added, the synergistic effect can be generated with the heat conducting fiber, the stress borne by the heat conducting fiber is reduced, the falling tendency of the heat conducting fiber is reduced, in the embodiment, sericite powder is preferably used, and the optimal effect is exerted by the mica powder.
Butyl acetate and diacetone alcohol are used as solvents in the embodiment, so that the film forming effect of the coating during drying can be ensured, compared with a single solvent, the blending of two solvents with similar dissolution parameters and similar boiling points can achieve the effect of complementary advantages, the inherent defects of the single solvent are overcome, the film forming effect of the coating is ensured more easily, and the success rate is high. The fumed silica is used as an anti-settling agent in the embodiment, and the fluffy powdery and porous fumed silica can effectively improve the suspension property of the filler in the coating, prevent the occurrence of the delamination phenomenon and keep the coating to have good stability. The dispersant is used for reducing the time used in the stirring and dispersing process, so that the mixture can be uniformly dispersed as soon as possible, in the embodiment, the BYK-ATU dispersant is selected, the leveling agent is used for avoiding the phenomena of shrinkage and the like of a formed film, the dispersant is a polyacrylate solution, and the BYK-355 leveling agent is selected.
Transition metal composite oxide powder 64 is as the heat absorbing material in this embodiment, its absorption ratio can reach 0.91, the emissivity is about 0.4, have very strong heat absorption performance, transition metal composite oxide powder 64 homodisperse back, form a plurality of heat absorption source in the coating, every heat absorption source is similar to "endothermic pump", inhale a large amount of heat on every side, then carry the heat everywhere in the coating through heat conduction fiber silk, make the coating inside and outside can not form local heat concentration phenomenon, the coating is heated evenly, the heat absorption capacity improves, and then make coating stability better. As shown in fig. 3, the expanded graphite 63, the transition metal composite oxide powder 64, the metal fiber filaments 61 and the carbon fibers 62 together form a three-dimensional heat conductive network, in the two-dimensional illustration, the slender metal fiber filaments 61 are lapped to form a basic net frame, because a plurality of lapping blind areas exist among the slender metal fiber filaments 61, the basic net frame is a basic net frame with a plurality of break points, a plurality of mutually lapped thin and short carbon fiber filaments 62 are uniformly dispersed at the lapping blind areas of the basic net frame, one part of the thin and short carbon fiber filaments 62 are connected with the basic net frame with the break points, most of the break points of the basic net frame are connected, the other part of the thin and short carbon fiber filaments 62 are lapped with the expanded graphite 63 and the transition metal composite oxide powder 64, and the expanded graphite 63 and the transition metal composite oxide powder 64 are indirectly communicated with the basic net rack, so that a continuous uninterrupted three-dimensional heat-conducting network is integrally formed.
Further, the transition metal composite oxide may be one or more of femnccuo 2, femnccuo 3, femnccuo 4, femnccuo 5 and FeCuO5, and is preferably FeCuO 5.
In the above, the preparation and application method of the flexible heat-conducting coating comprises the following steps:
step 1, adding organic silicon modified acrylic resin and a BYK-ATU dispersing agent into a reactor, and then stirring the mixed components by a stirrer at the rotating speed of 800r/min until the components are uniformly dispersed to obtain a base material;
step 2, sequentially adding asphalt carbon fiber yarns, small-particle expanded graphite, sericite powder, fumed silica and FeCuO5 powder into the base material obtained in the step 1, then adding butyl acetate and diacetone alcohol, and fully stirring the mixture by using a stirrer at the stirring speed of 1000r/min until the mixture is uniformly dispersed to obtain an initial coating;
and 3, adding the brass fiber and the BYK-355 leveling agent into the initial coating obtained in the step 2, uniformly dispersing by using a dispersion machine to obtain an uncured coating, pumping the uncured coating into a storage tank of an air spray gun, spraying the uncured coating on the surface of a treated base material (in the embodiment, the base material is a glass wool structural layer) by using the air spray gun, standing until the coating is leveled, putting the base material into a high-temperature oven, vacuum-baking the base material at 140 ℃ to form a film, preserving the heat for 10min, and cooling the base material to room temperature along with the oven to obtain the coating.
The metal reflective film has a large extinction coefficient and high reflectivity, is an excellent shading material, and can be used in the heat-insulating sunshade pad to enable the heat-insulating sunshade pad to have high reflectivity, and the reflectivity of the heat-insulating sunshade pad can be close to 1. Further, according to different needs of people, the selected metal reflecting film is different, for example, the metal thin material commonly used in the ultraviolet region is aluminum, the metal thin material commonly used in the visible region is aluminum and silver, the metal thin material commonly used in the infrared region is gold, silver and copper metal thin material, in this embodiment, the metal reflecting film is considered to be used for reflecting sunlight accidentally, and the reflecting film is required to have the function of weakening infrared energy, and comprehensively considered, the metal reflecting film can be selected from silver, aluminum, copper and the like, and is preferably made of silver metal thin material; more specifically, the metal reflection layer is sputtered onto the anti-tearing layer to a thickness of 50-150 μm (preferably 100 μm, or 50 μm or 150 μm).
The fluorocarbon varnish has the characteristics of excellent weather resistance, durability, scratch resistance, flexibility, corrosion resistance, strong adhesion and the like, so that the fluorocarbon varnish is a transparent coating, when the fluorocarbon varnish is coated on the metal reflective film, the fluorocarbon varnish does not corrode or damage the metal reflective film, does not influence the reflectivity of the metal reflective film, and well protects the metal reflective film, and in the embodiment, the spraying thickness of the fluorocarbon varnish is 150-300 mu m (preferably 180 mu m, and can also be selected to be 150 mu m or 300 mu m).
Phase change material 5's setting can play the effect of supplementary flexible heat-conducting layer heat absorption heat dissipation, do benefit to flexible heat-conducting layer heat absorption heat dissipation process, when the heat dissipation of flexible heat-conducting layer is untimely when the temperature itself is higher, through phase change material heat accumulation's function, absorb the heat of flexible heat-conducting layer, make flexible heat-conducting layer temperature reduction, and then give play to the heat absorption heat-sinking capability of flexible heat-conducting layer again, phase change material heat accumulation is when the critical value, phase change material no longer absorbs heat, withdraw thermal-insulated sunshade pad this moment, flexible heat-conducting layer is owing to no longer absorbing heat the temperature and reduce rapidly, phase change material releases the heat accumulation, and through flexible heat-conducting layer to external heat dissipation volume, until resumeing initial state (solid-like), in order to continue to use next time, cyclic utilization has been realized.
In order to make the phase-change material have the above functions, the phase-change material is a solid-liquid phase-change material, the phase-change temperature of the solid-liquid phase-change material is 31 to 36 ℃, and further, the solid-liquid phase-change material consists of the following components in percentage by mass: 7% of expanded graphite, 87% of binary eutectic fatty acid, 2% of porous magnesium oxide, 2% of porous polyester fiber and 2% of carboxymethyl cellulose, wherein the binary eutectic fatty acid is formed by blending lauric acid and myristic acid. The binary eutectic fatty acid is designed as a phase-change heat storage matrix, and as lauric acid and myristic acid have the characteristics of low price, easy obtainment, stable property, almost no toxicity, environmental protection, renewability and the like, the binary eutectic fatty acid is formed by blending lauric acid and myristic acid, the phase-change temperature of a eutectic formed after blending is proper, and the actual requirement is met (the phase-change temperature after blending is 20-50 ℃), furthermore, in the embodiment, the phase-change temperature of the binary eutectic fatty acid obtained after blending lauric acid and myristic acid is required to be 31-36 ℃, the phase-change latent heat is 141-167J/g, and the phase-change temperature is selected to be 31-36 ℃, mainly considering that the thermal dynamic balance temperature of an automobile body and a heat-absorbing coating after cooling is generally controlled to be 31-36 ℃, preferably, when the thermal dynamic balance temperature is controlled to be 33 ℃, the influence of the temperature of the vehicle body can be ignored, and at the time, the mass ratio of lauric acid to myristic acid in the phase transition temperature of the binary eutectic fatty acid is 58:42, the phase transition temperature is about 33 ℃, and the latent heat of phase transition is 151J/g.
The expanded graphite is a common organic phase-change material, has good compatibility with fatty acid organic matters, has the maximum adsorption mass of 80 percent in the fatty acid/expanded graphite-based phase-change composite material, hardly causes liquid leakage when the fatty acid undergoes phase change, and has strong stability. However, the fatty acid/expanded graphite-based phase-change composite material can only maintain excellent stability performance under the condition of not receiving large impact force and bending force, when the fatty acid/expanded graphite-based phase-change composite material receives large impact force and bending force (for example, when the heat insulation mat is folded), the porosity of the stretched part in the expanded graphite is increased, the fatty acid in liquid state is easy to be separated, the porosity of the compressed part is increased, the liquid filled in the gap is extruded and loses the attaching force, the liquid fatty acid separated from the expanded graphite flows, and further the phase-change material layer is damaged and loses effect, therefore, in the embodiment, the auxiliary shape-fixing adsorbate porous magnesium oxide and the porous polyester fiber are added, the porous magnesium oxide has excellent mesoporous characteristics, the liquid fatty acid can be fully absorbed in the porous magnesium oxide matrix, porous magnesium oxide is mixed in binary eutectic fatty acid, when the phase change material layer is subjected to impact force and bending force, a large amount of porous magnesium oxide is filled in the fatty acid forming liquid flow, the free porous magnesium oxide provides mobile adsorption points for the liquid flow fatty acid, the viscosity of the liquid flow is further increased, the tendency of structural deformation of the phase change material layer is prevented to a certain extent, the problem of flow leakage of the phase change material layer is effectively prevented, meanwhile, in order to further and completely solve the problem of flow leakage of the phase change material layer, porous polyester fiber is further added in the phase change material layer, the porous polyester fiber not only can improve the heat storage capacity, and the phase change material layer can exert the best effect.
The porous magnesium oxide and the porous polyester fiber are used in a compounding manner, a synergistic effect is generated in a formed phase change material layer, when solid fatty acid is subjected to phase change, free porous magnesium oxide moves along with liquid flow, the porous polyester fiber can block the free porous magnesium oxide, the viscosity of the liquid flow is further increased, the integral expression is that when the phase change material layer is subjected to phase change, the formed liquid is gathered in a local part due to high viscosity, the liquid flow cannot be formed, and the structural stability of the phase change material layer is further maintained. Meanwhile, when the phase change material layer is stretched and impacted, the particle shape and the fiber shape are combined, so that the toughness, the tear strength and the fatigue strength of the phase change material layer are improved, the phase change material layer can be bent, and the adaptability of the phase change material layer is improved.
More particularly, the preparation method of the porous magnesium oxide comprises the following steps: weighing a triblock polymer F-127 template agent with a designed amount into a reactor, adding absolute ethyl alcohol and magnesium nitrate hexahydrate, stirring and mixing for 10-15h under a vacuum environment, then putting the solution into a 50 ℃ constant-temperature drying box for drying until a sample is colloidal, then putting the obtained colloid into a box-type resistance furnace for calcining at 450 ℃, controlling the heating rate to be 2 ℃/min, calcining for 8h under the air condition, preserving heat for 2h after calcining, and then cooling to room temperature along with the furnace to obtain the material.
The preparation method of the solid-liquid phase change material comprises the following steps:
step 1, weighing lauric acid and myristic acid at a normal state according to a mass percentage of 58:42, uniformly stirring and mixing in a reactor, sealing the reactor, keeping the temperature in an oven at 80 ℃ until the lauric acid and the myristic acid are completely melted in the reactor, taking out, and uniformly stirring and mixing by using a stirrer to obtain a binary eutectic fatty acid mixed solution;
2, placing the binary eutectic fatty acid mixed solution in an ultrasonic water bath, carrying out ultrasonic vibration on the binary eutectic fatty acid mixed solution for 4min at the temperature of 60 ℃, then sealing the reactor again and placing the reactor in a drying oven at the temperature of 60 ℃ for heat preservation for later use;
step 3, drying the natural crystalline flake graphite in a vacuum drying oven at 50 ℃ for 12 hours, and heating in a box-type resistance furnace at 800 ℃ by using a high-temperature puffing method to obtain expanded graphite for later use;
step 4, putting the expanded graphite prepared in the step 3 into a reactor, putting porous magnesium oxide and porous polyester fiber into the reactor, stirring and mixing uniformly, and preserving heat in a water bath at 60 ℃ for later use;
step 5, under the vacuum environment, dripping the binary eutectic fatty acid mixed solution and the carboxymethyl cellulose into the reactor in the step 4 by using a dropper until the dripping is finished;
and 6, after the step 5 is finished, continuing the water bath at 60 ℃ in the reactor, fully stirring the reactor by using a stirrer until the materials are uniformly mixed, pouring the materials in the reactor into a pre-treated mould (in the embodiment, the mould is a glass wool structural layer), placing the mould in an oven at 70 ℃ for drying at constant temperature for 20-30h, and finally taking out and demoulding.
In summary, the preparation method of the heat-insulation sunshade pad comprises the following steps:
step 1, weaving high-strength yarns, combining and twisting 42-58 aramid fibers and 21-29 polyester fibers into the high-strength yarns according to the mass percentage of 2:1, and weaving the high-strength yarns into anti-tear layers;
step 2, dipping the obtained anti-tear layer in silica sol, standing for gelation, taking out after 10 hours, putting into a constant-temperature drying oven at 60 ℃ for drying to obtain the anti-tear layer subjected to gel treatment (so that the gel is full of pores in the anti-tear layer, heat is blocked from being transmitted to an automobile body, and the heat insulation performance of the anti-tear layer is greatly improved), and keeping for later use;
step 3, sputtering a metal reflecting film on one surface of the anti-tearing layer, then spraying fluorocarbon varnish on the formed metal reflecting film, and drying for later use;
step 4, manufacturing a glass wool forming die, and pressing glass wool into a glass wool structural layer with a conical substrate on one surface for later use;
step 5, spraying sealant on one surface of the glass wool structural layer with the conical substrate, forming a sealing layer on the surface of the glass wool structural layer, and drying for later use;
step 6, manufacturing a solid-liquid phase change material, heating the solid-liquid phase change material to be in a liquid phase, placing the liquid phase change material in a cone substrate of the glass wool structural layer, wherein the depth of the liquid phase change material in the cone substrate does not exceed the height of the cone substrate, and then placing the glass wool structural layer in a vacuum box for air cooling to room temperature;
step 7, manufacturing a flexible heat-conducting coating, adding organic silicon modified acrylic resin and a dispersing agent into a reactor, then stirring the mixed components by a stirrer at the rotating speed of 800r/min until the mixed components are uniformly dispersed to obtain a base material, then sequentially adding carbon fiber filaments, expanded graphite, mica powder, fumed silica and transition metal composite oxide powder into the base material, then adding butyl acetate and diacetone alcohol, and fully stirring the mixture by the stirrer at the stirring speed of 1000r/min until the mixed components are uniformly dispersed to obtain an initial coating;
step 8, adding metal fiber wires and a leveling agent into the initial coating obtained in the step 7, dispersing uniformly by using a dispersion machine to obtain an uncured coating, pumping the uncured coating into a storage tank of an air spray gun, spraying the surface, with the cone substrate, of the glass wool structural layer obtained in the step 6 by using the air spray gun, standing the sprayed coating with the thickness of 1-5mm (preferably 2mm, or 1mm or 5 mm) until the coating is leveled, placing the coated coating into a high-temperature oven, baking the coated coating in vacuum at 140 ℃ to form a film, keeping the temperature for 10min, and cooling the coated coating to room temperature along with the oven to obtain an initial heat-insulation sunshade pad;
and 9, bonding and fixing the surface without the metal reflecting film of the anti-tearing layer obtained in the step 3 and the surface without the flexible heat-conducting coating of the initial heat-insulation sunshade pad obtained in the step 7 by using a bonding agent to obtain the heat-insulation sunshade pad.
As shown in fig. 1 and 2, the metal reflective film 2 reflects most of sunlight to achieve a good sun-shading effect, the rest part of sunlight and heat are isolated by the anti-tear layer 3, and the heat and the sunlight cannot penetrate to the bottom of the heat-insulation sun-shading pad to achieve a heat-insulation effect; when the flexible heat conduction layer 6 is in contact with the vehicle body, the larger temperature difference enables the flexible heat conduction layer to absorb a large amount of heat of the vehicle body, so that the temperature of the vehicle body is continuously reduced until the vehicle body and the flexible heat conduction layer 6 reach thermal dynamic balance, if the thermal dynamic balance temperature is higher, the phase change material 5 absorbs the heat of the flexible heat conduction layer in a large amount, the temperature of the flexible heat conduction layer 6 is enabled to be reduced, the thermal dynamic balance temperature is further reduced, and the temperature of the vehicle body is in a lower state integrally, so that the risk of scalding is avoided. Meanwhile, the temperature in the car is further reduced due to the chain effect caused by the reduction of the temperature of the car body, and the temperature difference between the temperature in the car and the outside air temperature is within 6 ℃ and preferably only 2-3 ℃ after the heat-insulating sunshade pad is covered on the car for 1h in an open parking lot with the air temperature of 30 ℃ through field test, and is measured by a thermometer, the temperature difference between the temperature in the car and the outside air temperature is within 9 ℃ and preferably only 4-5 ℃, so that the heat-insulating sunshade pad is obviously superior to the heat-insulating sunshade pad used in the prior art.
Example two
The second embodiment is the same as the first embodiment except that the solid-liquid phase change material consists of the following components in percentage by mass: 9% of expanded graphite, 82% of binary eutectic fatty acid, 1% of porous magnesium oxide, 5% of porous polyester fiber and 3% of carboxymethyl cellulose, wherein the binary eutectic fatty acid is formed by blending lauric acid and myristic acid.
EXAMPLE III
Example three is the same as example one and example two except that the solid-liquid phase change material consists of, in mass percent: 7% of expanded graphite, 83% of binary eutectic fatty acid, 5% of porous magnesium oxide, 3% of porous polyester fiber and 2% of carboxymethyl cellulose, wherein the binary eutectic fatty acid is formed by blending lauric acid and myristic acid.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. A heat insulation sunshade pad for an automobile is characterized in that a metal reflecting film, a tearing-resistant layer, a glass wool structure layer and a flexible heat conduction layer are sequentially bonded from top to bottom, fluorocarbon varnish is uniformly coated on one surface, away from the tearing-resistant layer, of the metal reflecting film, the tearing-resistant layer is woven by high-strength yarns, a plurality of cone bases are arranged on one surface, bonded with the flexible heat conduction layer, of the glass wool structure layer, phase change materials are filled in the cone bases, and the flexible heat conduction layer is bonded with the glass wool structure layer through a bonding coating; the high-strength yarn is formed by combining and twisting aramid fibers and polyester fibers, wherein the mass percentage of the aramid fibers to the polyester fibers is 2:1, and the anti-tearing layer is impregnated by silica sol.
2. The automotive thermal insulating sunshade pad of claim 1 wherein the adhesive coating covers the side of the glass wool structural layer with the tapered base.
3. The thermal insulating sunshade pad for automobile according to claim 1, wherein the cone base is a cone-tower-shaped dome structure uniformly distributed on the glass wool structural layer, and the height of the cone base is 0.2-5 mm.
4. The heat-insulating sunshade pad for the automobile as claimed in claim 1, wherein the fluorocarbon varnish spraying thickness is 150-300 μm, the metal reflective film sputtering thickness is 50-150 μm, and the thickness of the flexible heat-conducting layer is 0.6-1 mm.
5. The automotive heat-insulating sunshade pad according to claim 1, wherein the flexible heat-conducting layer is composed of a flexible heat-conducting coating, and the flexible heat-conducting coating is composed of the following raw materials in parts by weight: 38 parts of organic silicon modified acrylic resin, 8 parts of expanded graphite, 14 parts of heat conducting fiber, 6 parts of mica powder, 6 parts of transition metal composite oxide powder, 10 parts of butyl acetate, 0.7 part of fumed silica, 15 parts of diacetone alcohol, 1.3 parts of a dispersing agent and 0.7 part of a flatting agent.
6. The heat-insulating sunshade pad for automobile of claim 1, wherein the phase change material is a solid-liquid phase change material, and the phase change temperature of the solid-liquid phase change material is 31-36 ℃.
7. The method for preparing the heat-insulating sunshade pad for the automobile according to claim 1, comprising the steps of:
step 1, weaving high-strength yarns, combining and twisting 42-58 aramid fibers and 21-29 polyester fibers into the high-strength yarns according to the mass percentage of 2:1, and weaving the high-strength yarns into anti-tear layers;
step 2, dipping the obtained anti-tear layer in silica sol, standing for gelation, taking out after 10 hours, and drying in a 60 ℃ constant temperature drying oven to obtain the anti-tear layer after gelation treatment for later use;
step 3, sputtering a metal reflecting film on one surface of the anti-tearing layer, then spraying fluorocarbon varnish on the formed metal reflecting film, and drying for later use;
step 4, manufacturing a glass wool forming die, and pressing glass wool into a glass wool structural layer with a conical substrate on one surface for later use;
step 5, spraying sealant on one surface of the glass wool structural layer with the conical substrate, forming a sealing layer on the surface of the glass wool structural layer, and drying for later use;
step 6, manufacturing a solid-liquid phase change material, heating the solid-liquid phase change material to be in a liquid phase, placing the liquid phase change material in a cone substrate of the glass wool structural layer, wherein the depth of the liquid phase change material in the cone substrate does not exceed the height of the cone substrate, and then placing the glass wool structural layer in a vacuum box for air cooling to room temperature;
step 7, manufacturing a flexible heat-conducting coating, adding the organic silicon modified acrylic resin and a dispersing agent into a reactor, stirring the mixed components by a stirrer at the rotating speed of 800r/min until the mixed components are uniformly dispersed to obtain a base material, then sequentially adding carbon fiber filaments, expanded graphite, mica powder, fumed silica and transition metal composite oxide powder into the base material, then adding butyl acetate and diacetone alcohol, and fully stirring the mixture by the stirrer at the stirring speed of 1000r/min until the mixture is uniformly dispersed to obtain an initial coating;
step 8, adding metal fiber wires and a leveling agent into the initial coating obtained in the step 7, dispersing uniformly by using a dispersion machine to obtain an uncured coating, pumping the uncured coating into a storage tank of an air spray gun, spraying the uncured coating on the surface, with the cone substrate, of the glass wool structural layer obtained in the step 6 by using the air spray gun, standing until the coating is leveled, putting the coating into a high-temperature oven, baking the coating in vacuum at 140 ℃ to form a film, keeping the temperature for 10min, and cooling the coating to room temperature along with the oven to obtain an initial heat-insulating sunshade pad;
and 9, bonding and fixing the surface without the metal reflecting film of the anti-tearing layer obtained in the step 3 and the surface without the flexible heat-conducting coating of the initial heat-insulation sunshade pad obtained in the step 7 by using a bonding agent to obtain the heat-insulation sunshade pad.
CN202011093373.XA 2020-10-14 2020-10-14 Heat insulation sunshade pad for automobile Pending CN114368211A (en)

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