A polyethylene thermal insulation composite

Abstract

The utility model relates to the technical field of composite material, concretely relates to a polyethylene heat insulation composite material, a kind of polyethylene heat insulation composite material, from outside to inside sequentially includes: polyethylene aluminized film layer;Bonding layer;Polyethylene woven cloth layer;And shower membrane layer;The aluminized surface of polyethylene aluminized film layer is set towards the polyethylene woven cloth layer.By reasonable laminar structure design, the utility model composite material simultaneously has excellent heat insulation performance, mechanical strength and weather resistance, is applicable to building sunshade, agricultural greenhouse, outdoor warehousing, transportation and the field, can effectively block solar radiation heat, simultaneously its high strength and weather resistance ensure the stability and reliability of long-term use, provide ideal heat insulation solution for various outdoor facilities.

Description

Technical Field

[0001] This utility model relates to the field of composite material technology, specifically to a polyethylene thermal insulation composite material. Background Technology

[0002] Currently, the mainstream thermal insulation materials on the market are mainly thick products such as boards, with very few thin products and limited application areas. Most of them are based on materials such as silica and non-woven fabrics, and when most materials are combined with aluminum foil or aluminized film, the aluminized side faces outward. For example, the patent: A thermal insulation aluminum-coated woven fabric (CN203499030U) directly composites aluminum foil and HDPE woven fabric with polyethylene as the adhesive layer. This structural design has the following defects: Directly compositing aluminum foil and polyethylene woven fabric, the double-sided composite aluminum foil structure makes the aluminum foil prone to damage during use, affecting the material's thermal insulation performance; direct exposure of the aluminum foil to the environment easily causes the aluminum layer to oxidize and peel off, resulting in a deterioration in appearance and a decrease in thermal insulation performance; long-term exposure of the aluminum-coated surface to sunlight and humidity will accelerate the aging of the aluminum layer, making it unable to maintain its original performance for a long time; when the aluminum side faces outward, it can only present a single metallic luster, with a monotonous color and limited application scenarios. The structural design with the aluminum-coated side facing outward has significant limitations in certain application fields, such as transportation and building shading. The aluminum-coated film has a strong reflective effect, and in summer, strong sunlight shining directly on the aluminum-coated film will produce strong light reflection, causing blurred vision and difficulty in opening the eyes, affecting safety. Utility Model Content

[0003] The purpose of this invention is to provide a polyethylene thermal insulation composite material that is structurally stable, has long-lasting thermal insulation performance, and is safe and durable, in order to solve the technical problems of existing polyethylene thermal insulation composite materials, such as easy damage and aging of the reflective layer, unstable thermal insulation performance, poor interlayer bonding, and safety hazards caused by exposed reflection.

[0004] To achieve the above objectives, this utility model provides a polyethylene heat-insulating composite material with a built-in reflective layer, comprising, from the outside to the inside: a polyethylene aluminized film layer; an adhesive layer; a polyethylene woven fabric layer; and a coating layer; the aluminized surface of the polyethylene aluminized film layer is disposed facing the polyethylene woven fabric layer; the adhesive layer is disposed between the aluminized surface of the polyethylene aluminized film layer and the polyethylene woven fabric layer, and the adhesive layer contains a resin for enhancing the surface polarity of the material.

[0005] Optionally, the basis weight of the polyethylene aluminized film is 12-35 g / m³. 2It can ensure good heat insulation effect without adding too much weight and cost; the structure design with the aluminum-plated side facing inward (towards the woven fabric layer) can effectively isolate external friction, scratches and light, and solve the problems of oxidation peeling and scratches caused by the aluminum layer being directly exposed to the air, so that the aluminum-plated film can maintain its heat insulation performance for a long time; it can also reduce the intensity of light reflected by the aluminum-plated layer, reducing the risk of using the heat insulation material in strong light environment.

[0006] The basis weight of the adhesive layer is 10-35 g / m³. 2 To ensure sufficient bonding strength, the addition of environmentally friendly resin with enhanced surface polarity to the adhesive layer effectively improves the problem of difficulty in bonding the aluminized layer and the polyethylene woven fabric layer due to the large polarity difference; even during subsequent processing (heat sealing) or use, it can maintain a stable bonding effect.

[0007] The basis weight of the polyethylene woven fabric layer is 140-200 g / m². 2 The mechanical strength and weaving density can be adjusted according to actual needs. This layer has high tensile strength, excellent weather resistance and corrosion resistance, and can maintain structural stability for a long time in complex environments.

[0008] The weight of the coating layer is 30-60 g / m². 2 The coating layer is made of environmentally friendly high-molecular polymer material, which has good flexibility and adhesion. It can closely adhere to the polyethylene woven fabric layer to form a continuous waterproof barrier. The surface of the coating layer is specially treated to have low surface energy, which can effectively prevent water droplet penetration and stain adhesion, further improving the practicality and durability of the composite material.

[0009] The four-layer structure design of this utility model not only optimizes the overall performance of the material, but also achieves the integration of multiple functions such as heat insulation, sun protection, waterproofing, moisture resistance and high strength through the synergistic effect between the layers.

[0010] Optionally, the resin used to enhance the surface polarity of the material is maleic anhydride-grafted polyethylene.

[0011] Optionally, the adhesive layer is made by blending the resin used to enhance the surface polarity of the material with low-density polyethylene.

[0012] Optionally, the polyethylene woven fabric layer is made of high-density polyethylene flat yarns woven in warp and weft.

[0013] Optionally, anti-aging masterbatch is added to the polyethylene woven fabric layer.

[0014] Optionally, the anti-aging masterbatch includes at least one of an ultraviolet absorber and a light stabilizer.

[0015] Optionally, the coating layer is made of polyethylene material.

[0016] Optionally, colored masterbatch is added to the polyethylene film of the aluminized polyethylene film layer.

[0017] This utility model has the following beneficial effects: 1. Long-lasting and stable heat insulation performance: By incorporating the aluminum-plated reflective layer into the structure and protecting it with an outer layer of polyethylene aluminum-plated film, direct contact between the reflective layer and the outside world is effectively avoided, preventing performance degradation caused by physical damage, oxidation and corrosion, thus ensuring the longevity of the heat insulation effect.

[0018] 2. High structural bonding strength and structural stability: By setting an independent adhesive layer containing polar resin between the polar aluminized surface and the non-polar polyethylene woven fabric layer, the bonding problem between heterogeneous materials is effectively solved, significantly improving the interlayer peel strength, preventing the material from delaminating during use, and ensuring the stability and durability of the overall structure.

[0019] 3. Good weather resistance: The anti-aging masterbatch added to the polyethylene woven fabric layer can improve the material's resistance to ultraviolet rays and aging, and extend its service life.

[0020] 4. High safety and wide range of applications: Because the outer layer is a polyethylene film, it avoids the problem of strong reflection and glare caused by direct exposure of the metal surface, thus improving application safety; at the same time, color masterbatch can be added to the outer polyethylene film to achieve a variety of appearances, meeting the aesthetic needs of different scenarios and broadening the application range. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic cross-sectional view of a polyethylene thermal insulation composite material with a built-in reflective layer provided in the embodiment; In the diagram, 1-polyethylene aluminized film layer; 2-adhesive layer; 3-polyethylene woven fabric layer; 4-coating layer. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Example 1 like Figure 1 As shown, the composite material is composed of four layers in structure, from the outside to the inside (i.e. from top to bottom): polyethylene aluminized film layer 1, adhesive layer 2, polyethylene woven fabric layer 3, and coating layer 4.

[0025] The composite material of this invention is made of high-density polyethylene through extrusion casting, slitting, stretching and shaping to obtain flat yarns, and then the flat yarns are woven into polyethylene woven fabric through warping. After the woven fabric undergoes anti-permeability pretreatment, the front and back coating layers are completed in one go by a double-die coating unit.

[0026] Specifically, the aluminized polyethylene film layer 1 constitutes the outermost layer of the composite material, directly facing the external environment. A key technical feature of this embodiment is that the aluminized film layer 1 is positioned in a specific direction, with its aluminized surface facing the inside of the composite material (towards the polyethylene woven fabric layer 3), while its polyethylene film surface serves as the outermost surface of the composite material. This "built-in reflective layer" design effectively protects the relatively fragile aluminum reflective layer from external friction and scratches during storage, transportation, installation, and long-term use. Simultaneously, because the aluminum layer does not directly contact corrosive media such as air, moisture, and acid rain, problems such as blackening, peeling, and decreased reflectivity caused by oxidation and corrosion are avoided, thus ensuring the long-term stability of the composite material's thermal insulation performance.

[0027] In addition, since the outermost layer is a polyethylene film rather than a highly reflective metal surface, it can effectively avoid glare (i.e., specular reflection) under strong light, which greatly improves safety in applications such as tarpaulins for road vehicles and buildings next to highways.

[0028] As an optional implementation method, to meet the aesthetic requirements of different application scenarios, color masterbatch can be added to the polyethylene film raw material constituting the polyethylene aluminized film layer 1. For example, green, blue, gray, or white color masterbatch can be added to give the composite material the corresponding color, breaking away from the single metallic color of traditional aluminized materials and broadening its application range in civil buildings, landscape facilities, and other fields.

[0029] An adhesive layer 2 is disposed between the aluminized surface of the aluminized film layer 1 and the polyethylene woven fabric layer 3 to solve the bonding problem between two material layers with vastly different properties. It should be noted that the inner aluminized surface of the aluminized film layer 1 has metal oxides on its surface, exhibiting strong polarity; while the polyethylene woven fabric layer 3 is composed of non-polar polyethylene material. Based on the principle of like compatibility, it is difficult to form a strong bond between polar and non-polar surfaces. If directly laminated, delamination and blistering are easily caused under temperature changes or external forces. To solve this technical problem, this application introduces a separate adhesive layer 2, and a resin for enhancing the polarity of the material surface is specially added to the material of this adhesive layer 2. The molecular chain of this polar resin contains polar functional groups, which can form strong chemical or physical adsorption forces with the metal oxides on the aluminized surface; at the same time, the main chain segments of this resin have good compatibility with the polyethylene material constituting the adhesive layer matrix, and form a stable physical bond with the non-polar polyethylene woven fabric layer 3 through molecular chain diffusion and entanglement. Thus, the adhesive layer 2 acts as a bridge between the two heterogeneous interfaces, firmly bonding the interfaces that were originally difficult to bond together, thereby significantly improving the interlayer peel strength of the composite material and ensuring the stability and durability of the overall structure.

[0030] The polyethylene woven fabric layer 3 serves as the skeleton layer of the entire composite material, primarily providing mechanical strength. In this embodiment, this layer is woven from high-density polyethylene flat yarns. High-density polyethylene itself possesses excellent mechanical properties, and its tensile strength is further enhanced after being stretched and oriented into flat yarns. Weaving these high-strength flat yarns at a specific warp and weft density creates a woven fabric structure that effectively disperses stress, endowing the composite material with extremely high tensile and tear strength. This allows it to withstand severe external forces such as strong winds and pulling, making it suitable for manufacturing large tarpaulins, warehouse covers, geotextiles, and other products requiring high mechanical properties.

[0031] The coating layer 4 is laminated onto the inner surface of the polyethylene woven fabric layer 3, forming the innermost layer of the composite material. This layer is typically formed by an extrusion coating process, where molten polyethylene resin is uniformly coated onto the surface of the woven fabric and then cooled and cured, resulting in a continuous, dense, and pinhole-free plastic film. Its main functions are waterproofing and moisture resistance. On one hand, it prevents external moisture (such as rainwater) from penetrating the upper structure and further infiltrating under extreme conditions; on the other hand, it also blocks water vapor or liquid from the inside of the material from contacting the woven fabric layer. For example, when used as a curtain in agricultural greenhouses or livestock farms, it prevents the high humidity environment inside from affecting the material structure. In addition, the coating layer 4 fills the gaps in the woven fabric, enhancing the airtightness of the entire composite material and making the inner surface smoother. In this embodiment, the coating layer 4 is made of polyethylene, such as low-density polyethylene, which has good flexibility and processing fluidity, making it very suitable as a coating material.

[0032] In this embodiment, to achieve balanced overall performance, the basis weight (i.e., mass per unit area) of each layer can be optimized. For example, the basis weight of the polyethylene aluminized film layer 1 can be selected as 30 g / m². 2 The basis weight of adhesive layer 2 can be selected as 30g / m². 2 The basis weight of polyethylene woven fabric layer 3 can be selected as 160 g / m². 2 The basis weight of the coating layer 4 can be selected as 40 g / m². 2 The composite material prepared using these parameters, according to actual testing, achieves a heat shielding rate of 82.58%, which is a 32.7% improvement in heat insulation performance compared to ordinary polyethylene woven fabric of the same weight but without an aluminum-coated reflective layer, demonstrating significant effectiveness. Furthermore, it exhibits high interlaminar peel strength, showing no delamination during repeated bending and tensile tests, thus demonstrating excellent structural stability.

[0033] Example 2 This embodiment provides a lightweight, low-cost polyethylene thermal insulation composite material solution to suit applications sensitive to material weight and procurement costs, such as disposable or short-term product packaging and temporary agricultural covering materials. This embodiment is also based on... Figure 1 The four-layer structure shown is mainly different in that the weight parameters of each constituent layer are selected from the lower limit of the preferred range, and another high-efficiency polar resin is used in the adhesive layer 2.

[0034] In this embodiment, the composite material, from the outside to the inside, still consists of a polyethylene aluminized film layer, an adhesive layer, a polyethylene woven fabric layer, and a coating layer. The specific basis weight parameters for each layer are set as follows: the basis weight of the polyethylene aluminized film layer 1 is 12 g / m³. 2 The basis weight of adhesive layer 2 is 10 g / m 2 The basis weight of polyethylene woven fabric layer 3 is 140 g / m².2 The basis weight of the 4-layer coating is 30 g / m². 2 Such parameter selection significantly reduces the total weight of the composite material, thereby consuming less raw material in production to reduce costs, while also facilitating handling and installation.

[0035] In this embodiment, maleic anhydride-grafted polyethylene (MPPE) is used as the resin to enhance the surface polarity of the material in adhesive layer 2. MPPE is a polymer obtained by chemically grafting highly polar maleic anhydride groups onto non-polar polyethylene molecular chains. Its mechanism of action is similar to that in Example 1: during the composite process, the maleic anhydride groups can chemically react with the metal oxide surface of the aluminized surface or form strong interaction forces, while its polyethylene backbone can achieve good melt bonding with the polyethylene woven fabric layer 3. Therefore, MPPE can also serve as an effective "interface compatibilizer" to solve the adhesion problem between the aluminized surface and the polyethylene substrate. Adhesive layer 2 can also be made by blending MPPE with low-density polyethylene to balance adhesion performance and processing costs.

[0036] Example 3 To meet the application requirements of long-term exposure to harsh outdoor environments, this embodiment provides a polyethylene thermal insulation composite material with superior weather resistance, which can be specifically used for flexible roofs of large stadiums, cargo yard covers at port terminals, canopies for long-term storage facilities, and agricultural facilities exposed to strong sunlight, etc. The structural basis of this embodiment remains... Figure 1 The four-layer structure shown differs in that it uses an upper limit weight parameter within a more optimized range.

[0037] In this embodiment, the four-layer structure of the composite material and its stacking order are consistent with those in Example 1. To maximize the physical strength and durability of the material, the basis weight parameters of each layer are selected as follows: the basis weight of the polyethylene aluminized film layer 1 is 35 g / m². 2 The basis weight of adhesive layer 2 is 35 g / m². 2 The basis weight of polyethylene woven fabric layer 3 is 200 g / m². 2 The basis weight of the 4-layer coating is 60 g / m². 2 The thickened layers provide the composite material with stronger physical barriers and mechanical properties.

[0038] The core improvement in this embodiment lies in the aging resistance modification of the polyethylene woven fabric layer 3, which serves as the skeleton. Specifically, a composite anti-aging masterbatch with a mass ratio of 2% is added to the high-density polyethylene flat yarn raw material used to produce the polyethylene woven fabric layer 3. This anti-aging masterbatch is a functional additive, and its components may include at least one of ultraviolet absorbers and light stabilizers.

[0039] As a preferred embodiment, the composite anti-aging masterbatch may contain a UV absorber (e.g., benzotriazole UV-326 or triazine UV-1164) and a hindered amine light stabilizer (e.g., HALS 944 or HALS 770). Understandably, these two additives work synergistically to provide comprehensive photo-aging protection for the polyethylene substrate. When the composite material is exposed to sunlight, the UV absorber preferentially absorbs high-energy UV rays and releases them as harmless heat, thus preventing UV rays from reaching and damaging the polyethylene molecular chains. However, a small amount of UV radiation will always trigger photo-oxidative degradation of the polymer, generating destructive free radicals. At this point, the hindered amine light stabilizer comes into play, efficiently capturing these free radicals, terminating the chain degradation reaction, and regenerating itself in the process, thus providing a long-term, cyclical stabilizing effect.

[0040] By introducing this composite anti-aging masterbatch into the polyethylene woven fabric layer 3, the aging process of polyethylene material under the combined action of environmental factors such as ultraviolet rays, oxygen, and heat (such as yellowing, embrittlement, and decline in mechanical properties) can be greatly delayed, ensuring that the woven fabric layer, as the "skeleton" of the composite material, can maintain its flexibility and high strength for a long time, thereby extending the service life of the entire composite material outdoors.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A polyethylene thermal insulation composite material, characterized in that, From the outside in, the following are included: Polyethylene aluminum-coated film layer; Adhesive layer; Polyethylene woven fabric layer; And the coating layer; The aluminum-plated surface of the polyethylene aluminized film layer faces the polyethylene woven fabric layer.

2. The polyethylene thermal insulation composite material according to claim 1, characterized in that, The basis weight of the polyethylene aluminized film layer is 12-35 g / m³. 2 ; The basis weight of the adhesive layer is 10-35 g / m³. 2 ; The basis weight of the polyethylene woven fabric layer is 140-200 g / m². 2 ; The basis weight of the coating layer is 30-60 g / m². 2 .

3. The polyethylene thermal insulation composite material according to claim 1, characterized in that, The adhesive layer contains a resin for enhancing the surface polarity of the material; the resin for enhancing the surface polarity of the material is modified polyethylene.

4. The polyethylene thermal insulation composite material according to claim 3, characterized in that, The resin used to enhance the surface polarity of the material is maleic anhydride-grafted polyethylene.

5. The polyethylene thermal insulation composite material according to claim 3 or 4, characterized in that, The adhesive layer is made by blending the resin used to enhance the surface polarity of the material with low-density polyethylene.

6. The polyethylene thermal insulation composite material according to claim 1, characterized in that, The polyethylene woven fabric layer is made of high-density polyethylene flat yarns woven together.

7. The polyethylene thermal insulation composite material according to claim 6, characterized in that, Anti-aging masterbatch is added to the polyethylene woven fabric layer.

8. The polyethylene thermal insulation composite material according to claim 7, characterized in that, The anti-aging masterbatch includes at least one of an ultraviolet absorber and a light stabilizer.

9. The polyethylene thermal insulation composite material according to claim 1, characterized in that, The coating layer is made of polyethylene material.

10. The polyethylene thermal insulation composite material according to claim 1, characterized in that, Color masterbatch is added to the polyethylene film of the aluminized polyethylene film layer.

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