A composite material

Abstract

The invention discloses a composite material, comprising a PET substrate, in which a conductive material is arranged. The composite material overcomes the disadvantages of using a traditional metal body as a purification unit, such as poor safety, high ozone content, easy oxidation corrosion, high production cost, and inability to form a self-cleaning and maintenance-free function.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, and in particular to a composite material that can be applied to a purification unit for removing particles in the air. Background Art

[0002] At present, one air purification technology for removing particulate matter from the air is electrostatic purification, which charges the particulate matter in the air. The charged particulate matter passes through a purification unit composed of conductive materials with the air, and the particulate matter is adsorbed by the electric field formed by the purification unit. Such conductive materials are usually metal materials, but metal materials used as purification units have disadvantages such as poor safety, high ozone content, easy oxidation and corrosion, and high production costs. Therefore, it is necessary to provide an alternative material to overcome the defects of using metal materials as purification units.

[0003] PET, the full name of polyethylene terephthalate, has a chemical formula of [COC6H4COOCH2CH2O]n; alias polyethylene terephthalate; Dacron; polyester; polyethylene terephthalate; Dacron, etc. PET is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It has good mechanical properties, and its impact strength is 3 to 5 times that of other films, and it has good folding resistance. It is resistant to oil, fat, olefinic acid, dilute alkali, and most solvents; it can be used normally between -70℃ and 60℃, and its mechanical properties are little affected by high and low temperatures; it has low gas and water vapor permeability, and has excellent gas, water, oil and odor barrier properties; it has high transparency, can block ultraviolet rays, and has good gloss; it is non-toxic, odorless, hygienic and safe, and can be directly used for food packaging.

[0004] PE, the full name of polyethylene, is a kind of plastic. It is a polymer formed by the polymerization of ethylene. Polyethylene is a white waxy translucent material. It is soft and tough, lighter than water, non-toxic, has excellent dielectric properties and low-temperature resistance. The minimum operating temperature can reach -100 to -70°C. It has good chemical stability and can withstand the corrosion of most acids and alkalis.

[0005] Graphene has excellent optical, electrical and mechanical properties, and has important application prospects in materials science, micro-nano processing, energy, biomedicine and drug delivery. It is considered to be a revolutionary material in the future. Scientists have found that graphene is also the best known material for electrical conductivity. Graphene can be printed or sprayed on substrates.

[0006] Ink is an important material used in printing. It prints or sprays patterns and texts on substrates. Ink includes main ingredients and auxiliary ingredients, which are evenly mixed and repeatedly rolled to form a viscous colloidal fluid. It is composed of binders (resins), pigments, fillers, additives and solvents. It is used for various printings such as books and periodicals, packaging and decoration, architectural decoration and electronic circuit boards. The density of ink is 1g / cm 3 To 2.25g / cm 3 between. Summary of the invention

[0007] The purpose of the present invention is to provide a composite material to replace the metal material of the existing purification unit and overcome the defects of the metal material.

[0008] To achieve the above objective, an embodiment of the present invention provides a composite material, including a PET substrate, wherein a conductive material is provided in the PET substrate.

[0009] Furthermore, the conductive material is conductive ink or graphene.

[0010] Furthermore, the resistivity of the composite material is 0.0025-3 (Ω·m).

[0011] Furthermore, the density of the composite material is 950-2200 kg / m 3 .

[0012] Furthermore, the PET substrate is in a strip shape.

[0013] Furthermore, the overall thickness of the composite material is 0.2-5 mm.

[0014] Furthermore, the width of the composite material is 5-500 mm.

[0015] Furthermore, the thickness of the ink and graphene is 0.02-2 mm.

[0016] Furthermore, the ink and graphene form a layer with a width of 0.5-490 mm in the strip.

[0017] Furthermore, the PET substrate is formed by hot pressing two PET strips, wherein at least one of the strips has conductive ink or graphene on its inner side.

[0018] Furthermore, the hot pressing temperature is 90-250° C., and the pressure is 0.5 MPa-800 MPa.

[0019] Furthermore, a PE layer is sandwiched between the two PET strips.

[0020] Furthermore, the thickness of the PE layer is 0.02-1 mm.

[0021] Furthermore, a plurality of ink layers or graphene layers are arranged inside the PET substrate.

[0022] Furthermore, the interval between each ink layer or graphene layer is 1-50 mm.

[0023] Furthermore, there is a glue layer between the PET substrate with the ink layer or the graphene layer and another PET substrate.

[0024] Furthermore, from the PET substrate on one side to the PET substrate on the other side, there are sequentially an ink layer or a graphene layer, a glue layer, a PE layer and a glue layer; wherein the ink layer or the graphene layer may be multiple.

[0025] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a PET strip as a substrate, and a conductive material such as ink is embedded inside the strip PET material to form a composite material. The composite material has a conductive function, and the purification unit made of the composite material can be widely used in the fields of HVAC and air purification. It has a simple structure, high strength, aging resistance, oxidation resistance, and corrosion resistance. The composite material overcomes the shortcomings of using traditional metal bodies as purification units, such as poor safety, high ozone content, easy oxidation corrosion, and high production costs. The purification unit formed by the composite material can also realize the self-cleaning and maintenance-free function. The self-cleaning can automatically clean the particulate matter accumulated on the purification unit regularly and transfer it to the dust collection device; at the same time, it has the property of withstanding higher voltage and current. The purification unit formed by this composite material has higher purification efficiency, stronger usability, and wider application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the side structure of a composite material provided by an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view at the conductive ink layer;

[0028] Figure 3 is a schematic side view of the composite material in another embodiment;

[0029] Figure 4 is a schematic side view of the composite material in another embodiment;

[0030] The cross-sectional views of the composite materials in the three embodiments are the same, viewed from the conductive ink;

[0031] In the figure: 1. PET strip; 3. Conductive ink layer; 3. Glue layer; 4. PE layer. DETAILED DESCRIPTION

[0032] The principle and spirit of the present invention will be described below with reference to several exemplary embodiments shown in the accompanying drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way.

[0033] Please refer to Figure 1 A composite material provided by an embodiment of the present invention is in the form of a strip-shaped body, and the strip-shaped body can form a purification unit with a filtering function in a certain manner. For example, the strip-shaped body can be wound to form a purification unit with a disc-shaped structure. There are gaps between the strip-shaped bodies in the purification unit with a disc-shaped structure for gas to flow through. When the air to be purified flows through the purification unit along the vertical direction of the disc surface of the disc-shaped structure, the air passes through the gap, and the charged particles in the air are adsorbed on the strip-shaped body, and then can be automatically cleaned by a self-cleaning device, thereby realizing a self-cleaning and maintenance-free function. Multiple strip-shaped bodies can also be arranged in parallel to form a rectangular structure. There are also gaps between adjacent strip-shaped bodies for gas to flow through, and then can be automatically cleaned by a self-cleaning device, thereby realizing a self-cleaning and maintenance-free function. The process of purifying gas is the same as the aforementioned principle.

[0034] Of course, although the present application uses a strip-shaped body as an example of a composite material, it should be understood that the composite material can also adopt other geometric shapes.

[0035] In this embodiment, the composite material includes a PET substrate as the substrate, and a PET strip 1 is used as the main body of the composite material. Figure 1 In the example, the PET strip 1 has two upper and lower strips, and the conductive ink is arranged on the inner side of the upper PET strip, but this is only an example, and the conductive ink can also be arranged on the inner side of the lower PET strip. In addition, the conductive ink layer can also be arranged on the inner side of the upper PET strip and the inner side of the lower PET strip respectively (that is, when there are two or more conductive ink layers, one or more conductive ink layers can be arranged on the inner side of the upper PET strip, and the remaining conductive ink layers can be arranged on the inner side of the lower PET strip, together forming a composite material with conductive properties), which all belong to the protection scope of the present invention. In this embodiment, a conductive ink layer 2 is formed on the inner side of the PET strip 1, and further, a glue layer 3 is also arranged on the inner side of the conductive ink layer 2, and the glue layer 3 is used to bond the conductive ink layer 2 to the inner side of another PET strip 1. The glue layer 3 can be formed by coating the inner side of the PET strip 1 with glue (as described below). It should be noted that in various embodiments of the present invention, the conductive ink can be replaced by other conductive materials, such as graphene. Therefore, the conductive ink layer described in each embodiment can also be a graphene layer.

[0036] One or more conductive ink layers 2 may be provided at intervals inside the PET strip 1. For example, in some embodiments, the conductive ink layer 2 is generally located in the middle of the PET strip 1, and in other embodiments, the conductive ink layer 2 is generally located in the lower part of the PET strip 1. In some embodiments, two adjacent conductive ink layers 2 are staggered by a certain distance in the thickness direction of the PET strip 1. In other embodiments, each conductive ink layer 2 is in the same plane inside the PET strip 1. The number of conductive ink layers 2 is also not limited, and may be one (e.g., Figure 1 ) can also be multiple (such as Figure 2 , Figure 3 ). A PE layer 4 is sandwiched between the two PET strips 1. During production, after PE is melted, it can increase the bonding between PET, and the structure of the material after molding is more compact and firm. (As described below). Due to the presence of the aforementioned adhesive layer 3, the bonding between PE and PET materials is increased during production, and the bonding between PE and PET and the ink on its surface is increased, and the bonding strength is improved during material molding.

[0037] The resistivity of the entire composite material is 0.0025-3 (Ω·m). The thickness of the entire composite material can be 0.2-5mm and the density is 950-2200kg / m 3 , width is 5-500mm. The thickness of the conductive ink layer is 0.02-2mm, and the density is 1000-2250kg / m 3 , the width is 0.5-490mm, and multiple strips can be set. When multiple ink layers are set, the interval between each ink layer can be 1-50mm, and multiple ink layers can be cut at the intervals as needed to avoid the ink layers being exposed to the air, and purification units of different widths can be formed; at the same time, setting multiple ink layers can also form purification units with different electric field spacings.

[0038] The thickness of the PE layer is 0.02-1mm and the density is 910-970.8kg / m 3 .

[0039] The composite material is mainly formed by hot pressing two layers of PET tapes. Two PET tapes are respectively wound on an axis, and a conductive ink of a certain width and thickness is printed on one of the PET tapes (it can be multiple), and then a special glue of a certain width and thickness is applied on the side printed with the conductive ink, and at the same time, it is combined with another layer of PET tape coated with a special glue of a certain width and thickness (the two layers of PET tapes have the same width and thickness, preferably the same thickness, but can also be different), and a thin layer of PE is sandwiched between the two layers of PET tapes (more specifically, it can be between two glue layers), and by providing a certain temperature and pressure (in this embodiment, the temperature of the hot pressing is 90-250°C and the pressure is 0.5-800MPa) equipment, the two layers of PET tapes can be tightly combined after complex heat treatment and pressure treatment, and PE plays a bonding role and promotes the combination of the two layers of PET tapes, and then after cooling and pressing, the composite material after molding is cut and processed, and composite materials of different widths are made according to needs. Of course, if other processes are used to form a composite material of this structure, it still belongs to the protection scope of the present invention.

[0040] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. A composite material used in a purification unit for removing particulate matter from the air, characterized in that: The invention comprises a PET substrate, which is a strip-shaped body; the PET substrate comprises two upper and lower strips; conductive ink or graphene is arranged on the inner side of the upper PET substrate to form an ink layer or a graphene layer; there are multiple ink layers or graphene layers, and the multiple ink layers or graphene layers are cut at intervals to form purification units with different widths; the width of the composite material is 5-500mm; the width of the layer formed by the ink or graphene in the strip-shaped body is 0.5-490mm; from the upper PET substrate to the lower PET substrate, there are an ink layer or a graphene layer, a glue layer wrapping the ink layer or the graphene layer, a PE layer and a glue layer in sequence.

2. The composite material for use in a purification unit for removing particulate matter in the air according to claim 1, characterized in that: The resistivity of the composite material is 0.0025-3 (Ω·m).

3. The composite material for use in a purification unit for removing particulate matter in the air according to claim 1, characterized in that: The density of the composite material is 950-2200 kg / m 3 .

4. The composite material for use in a purification unit for removing particulate matter in the air according to claim 1, characterized in that: The overall thickness of the composite material is 0.2-5 mm.

5. The composite material for use in a purification unit for removing particulate matter in the air according to claim 1, characterized in that: The thickness of the ink and graphene is 0.02-2 mm.

6. The composite material for use in a purification unit for removing particulate matter in the air according to claim 1, characterized in that: The thickness of the PE layer is 0.02-1 mm.

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