WO2019080462A1

WO2019080462A1 - Polyethylene film having thermal insulation layer, and high-altitude balloon

Info

Publication number: WO2019080462A1
Application number: PCT/CN2018/083662
Authority: WO
Inventors: 刘若鹏; 栾琳; 刘莹; 王文剑; 吴光飞; 苏亚军; 宁荣; 谢平; 叶娘华
Original assignee: 东莞前沿技术研究院
Priority date: 2017-10-27
Filing date: 2018-04-19
Publication date: 2019-05-02
Also published as: CN109720068A

Abstract

A polyethylene film having a thermal insulation layer, comprising: a solder layer (1); a load bearing layer (2), located on the solder layer (1); a barrier layer (3), located on the load bearing layer (2); a thermal insulation layer (4), located on the barrier layer (3); and a weather-resistant layer (5), located on the thermal insulation layer (4). According to the polyethylene film, a thermal insulation layer containing metal particles is additionally provided, and by means of scattering and blocking effects of the added metal particles, most light is diffuse-reflected or blocked after incident light passes through the processed film; thus, the occurrence of increase in temperature of the material is effectively avoided, and the temperature difference in a balloon is reduced. The film can be used for a high-altitude balloon.

Description

Polyethylene film with insulation layer and high air ball

Technical field

The present application relates to film of material and, more particularly, to a polyethylene film having an insulating layer.

Background technique

The high air ball is an unpowered aerostat. It is one of the few aircraft that can currently work in the stratosphere. It is a very important space detection and delivery vehicle. In the selection of high-air ball materials, the composite skin material usually based on fiber fabric has high reliability, but its cost is high and its application is greatly limited. The low cost polyethylene film is applied to high air balls, which can greatly reduce the cost. Therefore, polyethylene (PE) balloons have become a trend in the development of high air balls in the future.

technical problem

During the flight of a high air ball, the temperature difference is large due to the difference in solar radiation between day and night. The nighttime temperature is lowered, the high temperature causes the gas inside the sphere to expand, the pressure of the sphere rises continuously, and the increased pressure is absorbed by the capsule. When the temperature is lowered, the material is brittle and affects the life of the product.

In addition, the polyethylene film for high air ball requires high comprehensive performance (such as light transmittance, mechanical properties, weather resistance, welding processability, etc.), and polyethylene film used in other fields is often difficult to satisfy.

Technical solution

The invention adopts a cooling agent containing metal particles in a film layer of a polyethylene film for high air ball, and utilizes scattering and blocking effects of the added metal particles, and most of the incident light passes through the processed film. Light diffuses or blocks, effectively preventing the temperature of the material from increasing.

An embodiment of the present invention provides a polyethylene film comprising: a solder layer; a bearing layer on the solder layer; a barrier layer on the bearing layer; and an insulating layer on the barrier layer; a weatherable layer on the insulation layer.

In the above polyethylene film, the heat insulating layer is composed of low density polyethylene, linear metallocene low density polyethylene, and metal powder.

In the above polyethylene film, the metal powder includes one or more of aluminum powder, zinc powder, zinc oxide powder, and silver powder.

In the above polyethylene film, wherein, in the heat insulating layer, the low-density polyethylene, the linear metallocene low-density polyethylene, and the metal powder account for 60% to 80%, 10% to 20% by mass of the heat insulating layer, respectively. 10~20%.

In the above polyethylene film, the total thickness of the solder layer, the bearing layer, the barrier layer, the heat insulating layer, and the weather resistant layer is 5 to 80 μm.

In the above polyethylene film, wherein the thickness of the solder layer, the bearing layer, the barrier layer, the heat insulating layer, and the weather resistant layer is 10% to 20%, 50%, respectively. ~70%, 1~10%, 4~10% and 5~15%.

In the above polyethylene film, wherein the solder layer is composed of linear metallocene low density polyethylene.

In the above polyethylene film, wherein the bearing layer is a blended layer of high density polyethylene, low density polyethylene, and linear metallocene low density polyethylene.

In the above polyethylene film, wherein, in the bearing layer, high-density polyethylene, low-density polyethylene, and linear metallocene low-density polyethylene account for 60 to 80% by mass of the bearing layer, respectively. ~20% and 10~20%.

In the above polyethylene film, wherein the barrier layer is composed of high density polyethylene.

In the above polyethylene film, the weather resistant layer is composed of a light stabilizer of 2 to 5% by mass of the weather resistant layer, 0.1 to 0.4% of an antioxidant, and the remaining linear metallocene low-density polyethylene.

In the above polyethylene film, wherein the light stabilizer comprises one or more of salicylate, benzophenone and titanium dioxide, and the antioxidant includes butylated hydroxyanisole, dibutylhydroxytoluene and uncle One or more of butyl hydroquinone.

Another embodiment of the present invention provides a high air ball comprising a capsule having a predetermined shape, the capsule being fabricated from a polyethylene film as described above.

Beneficial effect

By adding a heat-insulating layer containing metal particles to the polyethylene film for high-air ball, the scattered light and the barrier effect of the added metal particles, the incident light passes through the processed film, and most of the light is diffusely reflected or blocked, thereby effectively avoiding the material temperature. The increased phenomenon reduces the temperature difference inside the balloon. Further, by adding layers, it is also possible to further expand the candidate range of raw materials for high air balls.

DRAWINGS

Fig. 1 is a schematic view showing the structure of a polyethylene film having a heat insulating layer for a high air ball.

Embodiments of the invention

The invention adopts a heat insulating layer in a polyethylene film for high air ball, introduces a cooling agent containing metal particles in the heat insulating layer, and uses the scattering and blocking effect of the added metal particles to process the incident light. Most of the light after the film is diffusely reflected or blocked, thereby effectively avoiding the increase in temperature of the material. In addition, when the temperature outside the balloon is lowered, the temperature drop inside the balloon can also be reduced due to the action of the insulating layer.

As shown in FIG. 1, a polyethylene film for high air ball is provided, which comprises a solder layer 1, a bearing layer 2, a barrier layer 3, an insulating layer 4, and a weathering layer 5. The five layers of raw materials are melted, plasticized and extruded into five layers of co-extrusion die by five extruders, and extruded into a film. The extruded film is then blow molded, drawn, folded and wound. The polyethylene film is a welded layer 1, a bearing layer 2, a barrier layer 3, a heat insulating layer 4, and a weathering layer 5 from the inside to the outside. The total thickness of the polyethylene film may be 5 to 80 microns, and the solder layer 1 is composed of linear metallocene low density polyethylene (MLLDPE), which accounts for 10 to 20% of the total thickness of the polyethylene film. The bearing layer 2 is a blended layer of high density polyethylene (HDPE), low density polyethylene (LDPE) and linear metallocene low density polyethylene (MLLDPE), which accounts for 50 to 70% of the total thickness of the polyethylene film. In the bearing layer 2, high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) account for 60-80% of the load-bearing layer 2, respectively. 20% and 10~20%. The barrier layer 3 is composed of high density polyethylene (HDPE), and the barrier layer 3 accounts for 1% to 10% of the total thickness of the polyethylene film. The heat insulating layer 4 is composed of a blend of low density polyethylene (LDPE) and linear metallocene low density polyethylene (MLLDPE) as a carrier and a cooling agent containing metal particles, and the heat insulating layer 4 accounts for 4% of the total thickness of the polyethylene film. ~10%. In some embodiments, the metal particle-containing cooling agent is a metal powder including, but not limited to, one or more of aluminum powder, zinc powder, zinc oxide powder, and silver powder. In the thermal insulation layer 4, the mass percentages of the low density polyethylene (LDPE), the linear metallocene low density polyethylene (MLLDPE), and the metal powder are 60 to 80%, 10 to 20%, and 10 to 20%, respectively.

The weatherable layer 5 is composed of a light stabilizer containing 2 to 5% by mass of the weather resistant layer 5, 0.1 to 0.4% of an antioxidant, and the remaining linear metallocene low density polyethylene (MLLDPE), and the weathering layer 5 is a polyethylene film. 5 to 15% of the total thickness. Wherein, the light stabilizer may include one or more of salicylate, benzophenone and titanium dioxide; the antioxidant may include butylhydroxyanisole (BHA), dibutylhydroxytoluene (BHT) and t-butyl group. One or more of hydroquinone (TBHQ).

The present invention also provides a high air ball comprising a capsule having a predetermined shape, the capsule being made of a polyethylene film as described above.

The present application is described below in conjunction with specific embodiments to enable those skilled in the art to better understand the present application.

Example 1

A polyethylene film including a solder layer 1, a bearing layer 2, a barrier layer 3, a heat insulating layer 4, and a weathering layer 5 was prepared by the following methods: raw materials of each layer were melted, plasticized, and extruded to five by five extruders, respectively. The layer is co-extruded, and the composite film is extruded, and the extruded film is blown, drawn, folded, and wound to obtain a polyethylene film.

The total thickness of the polyethylene film is 80 μm, and the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 account for 15%, 60%, 5%, 10%, and 10% of the total thickness, respectively. The high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) in the bearing layer 2 account for 80%, 10% and 10%, respectively, of the load-bearing layer 2. . The insulating layer 4 is composed of low density polyethylene (LDPE), linear metallocene low density polyethylene (MLLDPE), and aluminum powder, and they account for 60%, 20%, and 20% by mass of the insulating layer 4, respectively. The light stabilizer in the weatherable layer 5 is a salicylate, which accounts for 2% by mass of the weatherable layer 5, and the antioxidant is butylhydroxyanisole (BHA) in an amount of 0.1%.

The prepared high air ball is made into a small bag with a polyethylene film, and a temperature sensor is placed inside, and the obtained bag is placed in a high and low temperature box. When the temperature of the case is lowered to -47.4 ° C, the internal temperature of the bag is only -36.8. °C, when the temperature of the cabinet rises to 52.6 °C, the internal temperature of the bag is only 38.9 °C.

Example 2

A polyethylene film including the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 was prepared by a method similar to that of Example 1. The total thickness of the polyethylene film is 5 μm, and the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 account for 10%, 65%, 10%, 4%, and 11% of the total thickness, respectively. The high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) in the bearing layer 2 account for 70%, 15% and 15%, respectively, of the load-bearing layer 2. . The insulating layer 4 is composed of low density polyethylene (LDPE), linear metallocene low density polyethylene (MLLDPE), and zinc powder, and they account for 80%, 10%, and 10% by mass of the insulating layer 4, respectively. The light stabilizer in the weatherable layer 5 is benzophenone, which accounts for 5% by mass of the weatherable layer 5, and the antioxidant is dibutylhydroxytoluene (BHT) in an amount of 0.4%.

The prepared high air ball is made into a small bag with a polyethylene film, and a temperature sensor is placed inside, and the obtained bag is placed in a high and low temperature box. When the temperature of the case is lowered to -53.4 ° C, the internal temperature of the bag is only -43.8. °C, when the temperature of the cabinet rises to 68.6 °C, the internal temperature of the bag is only 55.9 °C.

Example 3

A polyethylene film including the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 was prepared by a method similar to that of Example 1. The total thickness of the polyethylene film is 40 μm, and the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 account for 20%, 60%, 5%, 10%, and 5% of the total thickness, respectively. The high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) in the bearing layer 2 account for 60%, 20% and 20%, respectively, of the load-bearing layer 2. . The insulating layer 4 is composed of low density polyethylene (LDPE), linear metallocene low density polyethylene (MLLDPE), and zinc oxide powder, and they account for 70%, 15%, and 15% by mass of the insulating layer 4, respectively. The light stabilizer in the weatherable layer 5 is titanium dioxide, which accounts for 3% by mass of the weatherable layer 3, and the antioxidant is tert-butyl hydroquinone (TBHQ) in an amount of 0.2%.

The prepared high air ball is made into a small bag with a polyethylene film, and a temperature sensor is placed inside, and the obtained bag is placed in a high and low temperature box. When the temperature of the case is lowered to -38.9 ° C, the internal temperature of the bag is only -25.8. °C, when the temperature of the cabinet rises to 45 °C, the internal temperature of the bag is only 32.8 °C.

Example 4

A polyethylene film including the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 was prepared by a method similar to that of Example 1. The total thickness of the polyethylene film is 20 μm, and the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 account for 20%, 50%, 8%, 7%, and 15% of the total thickness, respectively. The high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) in the bearing layer 2 account for 65%, 20% and 15%, respectively, of the load-bearing layer 2. . The insulating layer 4 is composed of low density polyethylene (LDPE), linear metallocene low density polyethylene (MLLDPE), and silver powder, and they account for 75%, 15%, and 10% by mass of the insulating layer 4, respectively. The light stabilizer in the weatherable layer 5 is benzophenone, which accounts for 4% by mass of the weatherable layer 5, and the antioxidant is dibutylhydroxytoluene (BHT) in an amount of 0.3%.

The prepared high-air ball is made into a small bag with a polyethylene film, and a temperature sensor is placed inside, and the obtained bag is placed in a high-low temperature box. When the temperature of the box is lowered to -41.5 ° C, the internal temperature of the bag is only -31.8. °C, when the temperature of the cabinet rises to 58.5 °C, the internal temperature of the bag is only 45.9 °C.

Example 5

A polyethylene film including the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 was prepared by a method similar to that of Example 1. The total thickness of the polyethylene film is 70 μm, and the welded layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 account for 15%, 70%, 1%, 8%, and 6% of the total thickness, respectively. The high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) in the bearing layer 2 account for 60%, 20% and 20%, respectively, of the load-bearing layer 2. . The insulating layer 4 is composed of low density polyethylene (LDPE), linear metallocene low density polyethylene (MLLDPE), and zinc oxide powder, and they account for 70%, 15%, and 15% by mass of the insulating layer 4, respectively. The light stabilizer in the weatherable layer 5 is titanium dioxide, which accounts for 3% by mass of the weatherable layer 3, and the antioxidant is tert-butyl hydroquinone (TBHQ) in an amount of 0.2%.

The prepared high air ball is made into a small bag with a polyethylene film, and a temperature sensor is placed inside, and the obtained bag is placed in a high and low temperature box. When the temperature of the case is lowered to -49.9 ° C, the internal temperature of the bag is only -38.8. °C, when the temperature of the cabinet rises to 55 °C, the internal temperature of the bag is only 42.5 °C.

Example 6

A polyethylene film including the solder layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 was prepared by a method similar to that of Example 1. The total thickness of the polyethylene film is 10 μm, and the welded layer 1, the bearing layer 2, the barrier layer 3, the heat insulating layer 4, and the weathering layer 5 account for 15%, 55%, 7%, 8%, and 15% of the total thickness, respectively. The high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear metallocene low-density polyethylene (MLLDPE) in the bearing layer 2 account for 75%, 10% and 15%, respectively, of the load-bearing layer 2. . The insulating layer 4 is composed of low density polyethylene (LDPE), linear metallocene low density polyethylene (MLLDPE), and silver powder, and they account for 75%, 15%, and 10% by mass of the insulating layer 4, respectively. The light stabilizer in the weatherable layer 5 is benzophenone, and the mass percentage of the weather resistant layer 5 is 3%, and the antioxidant is dibutylhydroxytoluene (BHT) in an amount of 0.3%.

The prepared high-air ball is made into a small bag with a polyethylene film, and a temperature sensor is placed inside, and the obtained bag is placed in a high and low temperature box. When the temperature of the box is lowered to -44.5 ° C, the internal temperature of the bag is only -33.7. °C, when the temperature of the cabinet rises to 53.5 °C, the internal temperature of the bag is only 40.9 °C.

It can be seen from Examples 1-6 that by adding a heat-insulating layer containing metal particles to a polyethylene film for high-air ball, the scattering and blocking effects of the added metal particles cause diffused reflection of most of the light after the incident light passes through the processed film. Or blocking, thereby effectively avoiding the increase in temperature of the material and reducing the temperature difference inside the balloon.

Generally, those skilled in the art can avoid the problem of large temperature difference during high air ball flight by improving the high and low temperature mechanical properties of the polyethylene film. However, the applicant of the present invention has found that by adding an insulating layer containing metal particles to the polyethylene film, the problem of avoiding a large temperature difference of the high air ball can also be achieved, and the candidate range of the raw material for the high air ball is further expanded. .

Claims

A polyethylene film comprising:

Welding layer

a bearing layer on the welding layer;

a barrier layer on the bearing layer;

An insulating layer on the barrier layer;

a weatherable layer on the insulation layer.
The polyethylene film according to claim 1, wherein the heat insulating layer is composed of low density polyethylene, linear metallocene low density polyethylene, and metal powder.
The polyethylene film according to claim 2, wherein the metal powder comprises one or more of aluminum powder, zinc powder, zinc oxide powder, and silver powder.
The polyethylene film according to claim 2, wherein in the insulating layer, the low-density polyethylene, the linear metallocene low-density polyethylene, and the metal powder account for 60-80% by mass of the insulating layer, respectively. %, 10~20% and 10~20%.
The polyethylene film according to claim 1, wherein the solder layer, the bearing layer, the barrier layer, the heat insulating layer, and the weather resistant layer have a total thickness of 5 to 80 μm.
The polyethylene film according to claim 5, wherein a thickness of the solder layer, the bearing layer, the barrier layer, the heat insulating layer and the weather resistant layer is a percentage of the total thickness It is 10~20%, 50~70%, 1~10%, 4~10% and 5~15%.
The polyethylene film according to claim 1, wherein the solder layer is composed of linear metallocene low density polyethylene.
The polyethylene film according to claim 1, wherein the load bearing layer is a blended layer of high density polyethylene, low density polyethylene, and linear metallocene low density polyethylene.
The polyethylene film according to claim 8, wherein in the load-bearing layer, high-density polyethylene, low-density polyethylene, and linear metallocene low-density polyethylene account for the mass percentage of the load-bearing layer It is 60~80%, 10~20% and 10~20%.
The polyethylene film according to claim 1, wherein the barrier layer is composed of high density polyethylene.
The polyethylene film according to claim 1, wherein the weather resistant layer is composed of 2 to 5% by mass of the weathering layer, 0.1 to 0.4% of an antioxidant, and the remaining linear Made of metal low density polyethylene.
The polyethylene film according to claim 11, wherein the light stabilizer comprises one or more of salicylate, benzophenone and titanium dioxide, and the antioxidant comprises butylated hydroxyanisole, One or more of dibutylhydroxytoluene and tert-butyl hydroquinone.
A high air ball comprising a capsule having a predetermined shape, the capsule being fabricated from the polyethylene film of any of claims 1-12.