阅读说明：本技术 一种自支撑高强真空绝热板及其制造方法 (Self-supporting high-strength vacuum insulation panel and manufacturing method thereof ) 是由 肇晶晶 林润俊 于 2020-08-13 设计创作，主要内容包括：本发明属于真空绝热板技术领域,涉及一种自支撑高强真空绝热板及其制造方法,真空绝热板包括蜂窝状的支撑体、填充在支撑体中空处的芯材填料、完全包裹支撑体和芯材填料的透气包材以及真空封装于透气包材外侧的阻隔膜,芯材填料由纳米多孔粉体、遮光剂及粘结纤维混合而成。方法步骤为在支撑体的空隙内填充芯材填料后成型,得到复合芯材,然后在复合芯材外包裹透气包材再干燥,或者一步法以透气包材为袋子分别装入支撑体和干燥的芯材填料,再封口,最后整体装入阻隔膜,抽真空,热封后得到自支撑高强真空绝热板。本真空绝热板具有优异的隔热性能,具有低成本、长寿命、低膨胀、低收缩、高强度及尺寸稳定等特点。(The invention belongs to the technical field of vacuum heat-insulating plates, and relates to a self-supporting high-strength vacuum heat-insulating plate and a manufacturing method thereof. The method comprises the steps of filling core material filler in gaps of a support body, forming to obtain a composite core material, then wrapping a breathable packaging material outside the composite core material, drying, or respectively filling the support body and the dried core material filler by taking the breathable packaging material as a bag in one step, sealing, finally filling a barrier film in the whole, vacuumizing, and performing heat sealing to obtain the self-supporting high-strength vacuum heat-insulating plate. The vacuum heat insulation plate has excellent heat insulation performance, and has the characteristics of low cost, long service life, low expansion, low shrinkage, high strength, stable size and the like.)

1. A self-supporting high-strength vacuum insulation panel comprises a honeycomb-shaped support body, a core material filler filled in the hollow part of the support body, a breathable packaging material completely wrapping the support body and the core material filler, and a barrier film vacuum-packaged on the outer side of the breathable packaging material, wherein the core material filler is formed by mixing 0-15 wt% of a nano porous powder, 0-5 wt% of a bonding fiber and the balance of the nano porous powder.

2. The self supporting high strength vacuum insulation panel according to claim 1 wherein: the nano-porous powder is a mixture of one or more of fumed silica, fumed titanium dioxide and fumed aluminum trioxide, the median particle size of the nano-porous powder is 7 nm-5 um, and the specific surface area of the nano-porous powder is 50-800 m²/g。

3. The self supporting high strength vacuum insulation panel according to claim 1 wherein: the opacifier is a mixture of one or more materials of silicon carbide, titanium oxide, carbon black or iron oxide, and the median particle size of the opacifier is 1-5 um.

4. The self supporting high strength vacuum insulation panel according to claim 1 wherein: the bonding fiber is a mixture of one or more materials of viscose fiber, glass fiber, high silica fiber, polyester fiber, carbon fiber and basalt fiber, the fiber length of the bonding fiber is 3-10 mm, and the fiber diameter is 5-13 um.

5. The self supporting high strength vacuum insulation panel according to claim 1 wherein: the material of the support body is selected from aramid fiber paper, common paper, kraft paper, plastic paper, aluminum or stainless steel.

6. The self supporting high strength vacuum insulation panel according to claim 1 wherein: the breathable packing material is made of high-transparency kraft paper or non-woven fabric.

7. A manufacturing method of the self-supporting high-strength vacuum insulation panel according to any one of claims 1 to 6 is characterized by comprising the following steps: filling core material filler in the gap of the support body, molding to obtain a composite core material, then wrapping the composite core material with a breathable packaging material, drying, or respectively filling the support body and the dried core material filler into bags made of the breathable packaging material by a one-step method, sealing, finally integrally filling a barrier film, vacuumizing, and performing heat sealing to obtain the self-supporting high-strength vacuum insulation panel.

Technical Field

The invention relates to the technical field of vacuum heat-insulating plates, in particular to a self-supporting high-strength vacuum heat-insulating plate and a manufacturing method thereof.

Background

The Vacuum Insulation Panel (VIP) is the most excellent thermal Insulation material in the prior art, and the thermal conductivity is usually 2-4.5 mW/m.k, which is only 1/5-1/10 of the traditional thermal Insulation material. Compared with the traditional heat insulation material, the vacuum heat insulation plate enables the core material to be in a near vacuum state through a vacuumizing process, and basically avoids heat convection of the material. And through special core material structure design, the heat conduction and the heat radiation of the material are also reduced to the minimum level. The method has wide application prospect in various fields such as cold chain transportation, household appliances, aerospace, building outer walls and the like. The development of the vacuum insulation panel is nearly hundred years, but the real large-scale development and application is in the initial stage of the 21 st century, so that the development of open-cell nano porous materials and other scientific technologies is facilitated on one hand, and the sound of the international society for energy conservation, emission reduction and environmental protection is increasingly rising on the other hand. But compared with the large-scale application in the fields of building material outer walls and the like in Europe, the application is relatively late at home, and the application cases in buildings are old and dull. Among them, the factors of high material cost, low strength, bubbling after air leakage, etc. are all important reasons for limiting the development.

Currently, the mainstream vacuum insulation panels mainly include two types, namely a gas silicon core material vacuum insulation panel and a glass fiber core material vacuum insulation panel. There are also a few open-cell foam vacuum insulation panels, such as polystyrene and polyurethane vacuum insulation panels, but the open-cell foam vacuum insulation panels are less in marketization application due to the fact that the open-cell foam vacuum insulation panels are not ideal in aging resistance, heat insulation performance, service life and the like. The glass fiber vacuum insulation panel is prepared by stacking glass fibers in a layered manner by a dry method or a wet method, and then carrying out processes such as needling, hot pressing, vacuumizing and the like. The glass fiber vacuum insulation panel is the vacuum insulation panel with the lowest initial heat conductivity coefficient at present, and the heat conductivity coefficient is about 2-3 mW/m.k. However, the glass fiber vacuum insulation panel is not satisfactory in the aspects of service life, air leakage expansion and the like, and is mainly used in the fields of household refrigerators, vending machines and the like with low requirements at present. The gas silicon core material vacuum insulation panel is a relatively high-end vacuum insulation panel at present, is widely applied in Europe, has excellent robustness, good appearance and long service life, and has a heat conductivity coefficient of about 4 mW/m.k generally. But the price factor is an important reason for limiting the large-scale application of the composite material, and secondly, the mechanical strength also limits the application of the composite material in a special pressure-bearing environment. The theoretical life can be as long as about 70 years, while the glass fiber vacuum insulation plate is usually 10-15 years.

For the thermal insulation material, the thermal conductivity is an important index for examining the thermal insulation performance, and the practical application focuses more on the thermal resistance of the thermal insulation material. In short, the thermal resistance can be equivalent to the ratio of the thickness of the material to the thermal conductivity, i.e., the thicker the thickness or the lower the thermal conductivity, the higher the thermal resistance of the material, and the better the thermal insulation effect. The thickness is obviously shrunk in the preparation process of the vacuum insulation panel, so that the thermal resistance value of the material is reduced, and the use requirement can be met only by designing a thicker size. Of course, shrinkage can also be reduced by increasing the density, but at the expense of significant cost and thermal conductivity.

In view of the above, it is an important issue to be solved in the industry how to develop a vacuum insulation panel with high strength, low thermal conductivity, low shrinkage, low cost, long service life and excellent comprehensive performance.

Disclosure of Invention

The invention mainly aims to provide a self-supporting high-strength vacuum insulation panel and a manufacturing method thereof, and the vacuum insulation panel with excellent comprehensive performance can be obtained.

The invention realizes the purpose through the following technical scheme: a self-supporting high-strength vacuum insulation panel comprises a honeycomb-shaped support body, a core material filler filled in the hollow part of the support body, a breathable packaging material completely wrapping the support body and the core material filler, and a barrier film vacuum-packaged on the outer side of the breathable packaging material, wherein the core material filler is formed by mixing 0-15 wt% of a nano porous powder, 0-5 wt% of a bonding fiber and the balance of the nano porous powder.

Specifically, the nano-porous powder is a mixture of one or more of fumed silica, fumed titanium dioxide and fumed aluminum trioxide, the median particle size of the nano-porous powder is 7 nm-5 um, and the specific surface area of the nano-porous powder is 50-800 m²/g。

Specifically, the opacifier is a mixture of one or more materials of silicon carbide, titanium oxide, carbon black or iron oxide, and the median particle size of the opacifier is 1-5 um.

Specifically, the bonding fiber is a mixture of one or more materials of viscose fiber, glass fiber, high silica fiber, polyester fiber, carbon fiber and basalt fiber, the fiber length of the bonding fiber is 3-10 mm, and the fiber diameter is 5-13 um.

Specifically, the material of the support body is selected from plastic paper, kraft paper, aramid paper, plain paper, aluminum or stainless steel.

Specifically, the breathable packing material is high-transparency kraft paper or non-woven fabric.

A manufacturing method of a self-supporting high-strength vacuum insulation panel comprises the following steps: filling core material filler in the gap of the support body, molding to obtain a composite core material, then wrapping the composite core material with a breathable packaging material, drying, or respectively filling the support body and the dried core material filler into bags made of the breathable packaging material by a one-step method, sealing, finally integrally filling a barrier film, vacuumizing, and performing heat sealing to obtain the self-supporting high-strength vacuum insulation panel.

By adopting the technical scheme, the technical scheme of the invention has the beneficial effects that:

the vacuum heat insulation plate has excellent heat insulation performance, and has the characteristics of low cost, long service life, low expansion, low shrinkage, high strength, stable size and the like.

Drawings

FIG. 1 is a block diagram of an exemplary self-supporting high-strength vacuum insulation panel.

The figures in the drawings represent:

1-support, 2-core material filler, 3-breathable packaging material and 4-barrier film.

Detailed Description

As shown in figure 1, the self-supporting high-strength vacuum insulation panel comprises a honeycomb-shaped support body 1, a core material filler 2 filled in the hollow part of the support body 1, a breathable packing material 3 closing two sides of the support body 1 and a barrier film 4 tightly wrapping the outer sides of the support body 1 and the breathable packing material 3, wherein the core material filler 2 is formed by mixing nano porous powder, an opacifier and bonding fibers, the opacifier is 0-15 wt%, the bonding fibers are 0-5 wt%, and the balance of the nano porous powder is complemented.

A manufacturing method of a self-supporting high-strength vacuum insulation panel comprises the following steps: filling core material filler in the gap of the support body, molding to obtain a composite core material, then wrapping the composite core material with a breathable packaging material, drying, or respectively filling the support body and the dried core material filler into bags made of the breathable packaging material by a one-step method, sealing, finally integrally filling a barrier film, vacuumizing, and performing heat sealing to obtain the self-supporting high-strength vacuum insulation panel.

The present invention will be described in further detail with reference to specific examples.