Preparation method of hollow rollable composite thermal insulation material

Abstract

A dynamic air convection channel (7) is formed through collaborative design of double-sided reflecting layers (1 and 3) and an elastic supporting frame (2), and the heat insulation effect is larger than 50%. A precise planetary gear set and a ratchet wheel self-locking assembly are arranged in the reel mechanism (5), and rapid storage and precise unfolding are achieved. The insertion piece type connection (8) and the middle section fixing outer sleeve (9) enhance the structural stability, and are suitable for high-frequency folding and unfolding scenes. The material has the characteristics of ultra-thinness, light weight and high reflectivity.

Description

Technical Field

[0001] The present invention relates to the field of thermal insulation materials, and in particular to a hollow rollable composite thermal insulation material and a preparation method thereof, which is suitable for scenes that require high-frequency retraction and release and have strict requirements on light weight and high reflectivity, such as building sunshade, vehicle thermal insulation, and outdoor equipment protection. The material solves the technical problems of traditional thermal insulation materials, such as heavy weight, low reflectivity, and inconvenient storage, through the coordinated design of multi-layer composite structure and dynamic air channels. Background Art

[0002] Existing flexible thermal insulation materials mostly use a single reflective layer or static air layer design. For example, the "aluminum-coated film thermal insulation material" disclosed in patent CN202010001234.5 has a reflectivity of only 30%-40% and lacks a dynamic unfolding mechanism, resulting in limited thermal insulation effect. In addition, traditional roll-type thermal insulation materials (such as CN201920000567.8) are difficult to achieve lightweight and efficient thermal convection due to the bulky supporting structure and fixed air layer.

[0003] The innovation of the present invention is:

[0004] 1. Double-sided reflective layer: through aluminum / silver-plated substrate and TiO 2 / SiO 2 The composite design of nano-coating increases the reflectivity to ≥50%;

[0005] 2. Dynamic air channel: Utilize the linkage between the elastic support frame and the scroll mechanism to form an adjustable arched air layer to enhance the efficiency of heat convection;

[0006] 3. Plug-in connection: The combined structure of the flexible fixed end and the outer sleeve extension section ensures the stable connection between the support frame and the upper and lower layers to avoid interlayer peeling. Summary of the invention

[0007] The present invention provides a hollow rollable composite thermal insulation material, including the following technical solutions:

[0008] 1.Structural composition:

[0009] Upper layer (1): made of aluminum or silver-plated fabric / paper material and TiO 2 / SiO 2 Nano-coating composite formation, reflective layer thickness 50-200nm, UV / infrared reflectivity ≥50%;

[0010] Lower layer (3): Made of flexible substrates such as fiber woven cloth and TPU film coated with aluminum / silver, it has both mechanical strength and flexibility;

[0011] Support frame component (2): PC sheets or hard kraft paper strips distributed in an array, with a spacing of 5-20 cm and an elastic modulus ≥ 1.5 GPa, which form an arched air channel (7) with a height of 1-10 cm after unfolding;

[0012] Reel mechanism (5): Built-in planetary gear set (module 0.3, transmission ratio 1:5) and ratchet self-locking assembly to achieve one-touch storage and precise unfolding.

[0013] 2. Technical effects:

[0014] The dynamic air channel (7) can accelerate heat dissipation when in the unfolded state, and the heat insulation efficiency is improved by more than 50% compared with traditional materials;

[0015] The reel mechanism (5) and the insert-type connection structure (8) work together to support more than 10,000 retraction and extension cycles without structural failure.

[0016] Overall material thickness <3mm, surface density ≤500g / m 2 , to meet the lightweight needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Combined with the accompanying drawings ( Figures 1 to 8 ), the specific instructions are as follows:

[0018] Figure 1 : A cross-sectional view in an unfolded state (a schematic diagram of the cut surface being opened), showing the arched air passage (7) formed by the support frame (2) unfolding at 90°, with the passage height marked as 1-10 cm;

[0019] Figure 2 : Closed state cross-sectional view (cut surface closed schematic diagram), the support frame (2) is flatly attached between the upper and lower layers (1, 3), and the interlayer spacing is less than 1mm;

[0020] Figure 3 : A three-dimensional image of the roll storage (a schematic diagram of the cut-face roll storage), showing that the roll (5) has a diameter of 5 cm and the insulation material is rolled into a tight cylindrical shape (6);

[0021] Figure 4 : Schematic diagram of the support frame arrangement from top view (schematic diagram of the support frame arrangement from the front view), with the parallel array spacing of 5-20cm and the support frame width of 2-15cm marked;

[0022] Figure 5-Figure 8 :Detailed display of the fixing process of the insert (8) and the extension section of the jacket (9), including key structures such as the hot pressing melting point (12) and the UV curing adhesive bonding area. Figure 5 : (Schematic diagram of inserting the support frame insert), Figure 6 :(Schematic diagram of the cut surface of the support frame), Figure 7 : (Schematic diagram of the fixed cut surfaces at the upper and lower ends of the support frame), Figure 8 : (Schematic diagram of the closed cut surface of the support frame). Description of reference numerals: (1) Upper layer (i.e., ultraviolet and infrared reflection layer); (2) Support frame (fixed support for air circulation layer); (3) lower layer (i.e., ultraviolet and infrared reflection layer); (4) Overall storage and closing state; (5) roller (storage reel); (6) The insulation material is stored and curled; (7) support frame arrangement (regular array arrangement); (8) Support frame sheet (i.e., light and elastic material, such as plastic sheet, hard kraft paperboard, etc.); (9) Extension section of the support frame jacket (used to fix the upper and lower layers of fabric); (10) upper and lower fixed ends of the support frame; (11) Support frame insert cut surface; (12) The extension section of the outer jacket of the support frame fixes the upper and lower layers; (13) Support frame closed bevel. DETAILED DESCRIPTION

[0023] The present invention is further described below with reference to the following examples, but they do not limit the scope of protection.

[0024] Example 1: Building sunshade and heat insulation roller shutter

[0025] 1. Material preparation:

[0026] Upper layer (1): A polyester fiber base fabric is used, and an aluminum layer (thickness 80nm) and a TiO2 layer are alternately deposited by magnetron sputtering. 2 / SiO 2 Nano coating (total thickness 120nm);

[0027] Lower layer (3): TPU film is silver-plated and then cured by micro-dot UV to form a flexible base layer;

[0028] Support frame (2): PC sheet (elastic modulus 2.0 GPa) is cut into strips with a width of 1-5 cm and a length of 2-15 cm, wrapped with a silver-plated fabric jacket (9), and 3-5 cm fixed ends (10) are reserved at both ends.

[0029] 2. Assembly process:

[0030] The support frame extension section (9) is embedded into the upper and lower layers (12) by hot pressing, melting, sewing, or gluing, and the middle section is bonded with UV curing glue;

[0031] The edge of the material is fixed to the reel (5) through an aluminum alloy strip, and an integrated planetary gear set (module 0.3) and a ratchet self-locking mechanism are provided.

[0032] 3. Performance test:

[0033] Reflectivity: 58% in ultraviolet band, 63% in infrared band;

[0034] After unfolding, the air channel height is 2-8cm, and the thermal insulation temperature difference is >15℃ (measured ambient temperature 40℃→25℃ on the back).

Claims

1. A hollow rollable composite thermal insulation material, characterized in that: Includes the following structures: Upper layer (1): a UV and infrared reflective layer formed by a composite of aluminum-plated or silver-plated fabric or paper material and TiO2 / SiO2 nano-coating, with a thickness of 50-200nm; Lower layer (3): a flexible base layer formed by fiber woven fabric, paper material or TPU film coated with aluminum or silver; Support frame assembly (2): composed of light elastic strip support frames distributed in an array, the support frame material is polycarbonate (PC) sheet or hard kraft paper board, and the distance between adjacent support sheets is 5-20 cm; Reel mechanism (5): integrated at one end of the material, with a built-in ratchet self-locking mechanism and a planetary gear set, used to synchronously drive the expansion and closing of the support frame; Insert type connection structure (8): the two ends of the support frame are embedded in the upper and lower layers (12) through the flexible fixed ends (10), and the middle section is bonded and fixed to the upper and lower layers through the outer jacket extension section (9), and is melted by sewing, gluing or hot pressing process.

2. The composite thermal insulation material according to claim 1, characterized in that: The support frame assembly (2) is coated with a flexible material jacket (9) on the outside, and the two ends of the jacket extension section are fixed to the upper and lower layers (1, 3) by a micro-dot UV curing process, or melted by sewing, gluing or hot pressing.

3. The composite thermal insulation material according to claim 1, characterized in that: The storage mechanism of the reel mechanism (5) is: In the storage state (6), the support frame (2) is laid flat and fits between the upper and lower layers; In the unfolded state, the scroll rotates to drive the support frame (2) to form an arched air channel (7) with a channel height of 1-10 cm and an unfolding angle of 45°-90°.

4. The composite thermal insulation material according to claim 1, characterized in that: The ultraviolet / infrared reflectivity of the upper layer (1) and the lower layer (3) is ≥50%, and the reflective layers are symmetrically distributed to achieve double-sided heat insulation.

5. A method for preparing the composite thermal insulation material according to any one of claims 1 to 4, characterized in that The following steps are involved: (a) Al-plated layers and TiO2 / SiO2 nano-coatings are alternately deposited on a polyester fiber base fabric or a paper material by a magnetron sputtering process to form a double-sided reflective layer (1, 3); (b) using a micro-dot UV curing process to form a lower layer (3) of a fiber woven cloth, a paper material or a TPU film composite material; (c) Wrapping the cut support frame (2) with the flexible jacket (9), fusing by sewing, gluing or hot pressing, and then embedding the two ends of the extension section of the support frame into the upper and lower layers (12); (d) The edge of the composite material is fixed to the ratchet self-locking component of the reel mechanism (5) through a pressure strip, and a planetary gear set is integrated.

Images