Gas isolation ethylene-propylene-diene monomer self-adhesive coiled material and preparation method thereof

Abstract

The invention discloses a gas isolation ethylene-propylene-diene monomer self-adhesive coiled material and a preparation method, the coiled material is composed of a sheet layer, a self-adhesive layer and an isolation layer, the sheet layer is a bottom layer, the sheet layer is coated with the self-adhesive layer as a middle layer, the self-adhesive layer is coated with an isolation material as an isolation layer, ethylene-propylene-diene monomer is used as an isolation material, and the isolation material is used as an isolation layer. The preparation method comprises the following steps: mixing polyethylene, thermoplastic elastomer and other materials, carrying out hot melting granulation, extruding in a plastic extruder, and carrying out three-roller forming to prepare a homogeneous sheet as a basis; a vulcanizing agent, a cross-linking agent, a plasticizer, a gas barrier agent and an anti-blocking agent are added, so that the compatibility of discontinuous-phase rubber and continuous-phase plastic and the gas isolation performance, machinability and the like of the homogeneous sheet are improved; and uniformly coating a layer of self-adhesive glue on the homogeneous sheet through a coating machine, and covering the homogeneous sheet with an isolation material. The processing technology is mature, construction is convenient, and the durability, physical and mechanical properties, certain flame retardance, convenient construction performance and excellent gas isolation performance of the ethylene-propylene-diene monomer self-adhesive coiled material are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof coiled materials, and particularly relates to a gas-isolating ethylene propylene diene monomer (EPDM) self-adhesive coiled material and a preparation method thereof. Background Art

[0002] In order to improve linearity and shorten mileage, many highways and railways adopt tunnel schemes. It is quite common for railways and highways to pass through coal measures areas with weak lithology and coal seam gas tunnels with high-pressure gas deposits; in the construction industry, underground construction is relatively common, which also requires early prevention of the occurrence of gas disasters. Currently, during construction, PE boards are mainly used, but the gas barrier performance of PE boards is very poor. To solve this problem, a PE gas isolation board is formed by lining a closed-cell foam cushion layer with a certain thickness outside the PE board. The compactness and impermeability of this sandwich structure have certain significance for preventing the accumulation and leakage of gas. However, the quality of existing commercially available traditional PE gas isolation boards varies, and they cannot simultaneously meet several major performance requirements for gas tunnel construction: high flame retardancy, high airtightness, high barrier property, and high strength, thus bringing certain potential safety hazards to the construction and later use of gas tunnels. In addition, the construction process of traditional gas isolation boards is relatively cumbersome. It is necessary to first line the foam plastic protective layer and then construct the isolation board, increasing the construction cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a gas-isolating EPDM self-adhesive coiled material and a preparation method thereof, specifically a gas-isolating EPDM self-adhesive coiled material with good gas barrier property, good airtightness, good water resistance, high strength, and convenient processing, and its preparation method, so as to solve the problem that the quality of existing gas isolation boards varies and they cannot simultaneously meet the high flame retardancy, high airtightness, high barrier property, and high strength performance requirements for gas tunnel construction.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A gas-isolating EPDM self-adhesive coiled material provided by the present invention is composed of a sheet layer, a self-adhesive layer, and an isolation layer. The sheet layer is the bottom layer, the self-adhesive layer is coated on the sheet layer as the middle layer, and an isolation material is further covered on the self-adhesive layer as the isolation layer. The sheet layer is composed of EPDM rubber, polyethylene, thermoplastic elastomer, vulcanizing agent, crosslinking agent, plasticizer, gas barrier agent, and anti-blocking agent.

[0005] The sheet layer provides durability, excellent physical and mechanical properties, and a certain degree of gas isolation; the self-adhesive layer provides a certain degree of flame retardancy and good adhesiveness. These two structures are combined together, thus ensuring the durability, physical and mechanical properties, a certain degree of flame retardancy, convenient construction performance, and excellent gas isolation performance of the EPDM self-adhesive coiled material.

[0006] In an embodiment of the present invention, the sheet layer is specifically composed of the following materials by weight percentage: 40-55% ethylene propylene diene monomer (EPDM), 10-20% polyethylene, 5-10% thermoplastic elastomer, 1-2% vulcanizing agent, 1-3% crosslinking agent, 14.5-22.5% plasticizer, 5-10% gas barrier agent, and 0.5% antiblocking agent.

[0007] In an embodiment of the present invention, the ethylene propylene diene monomer (EPDM) is one or a combination of EPDM obtained by solution polymerization and EPDM obtained by gas phase polymerization.

[0008] In an embodiment of the present invention, the polyethylene is high density polyethylene, and the thermoplastic elastomer is an ethylene-propylene block copolymer with a propylene content of 14-17%.

[0009] In an embodiment of the present invention, the plasticizer is one or a combination of paraffin oil, naphthenic oil, and aromatic oil.

[0010] In an embodiment of the present invention, the vulcanizing agent is sulfur, the gas barrier agent is ethylene-vinyl alcohol copolymer, and the antiblocking agent is silica.

[0011] In an embodiment of the present invention, the self-adhesive layer is obtained by coating self-adhesive glue on the sheet layer. The self-adhesive glue is transported through a pipeline and coated on the sheet layer by a roller.

[0012] In an embodiment of the present invention, the release material is a silicone-coated release film.

[0013] In an embodiment of the present invention, the sheet is prepared by mixing and granulating, extruding through a twin-screw extruder, forming with three rolls, and drawing.

[0014] The present invention also provides a method for preparing a gas isolation EPDM self-adhesive coil, comprising the following steps: S1. Mix 40-55% ethylene propylene diene monomer (EPDM), 10-20% polyethylene, 5-10% thermoplastic elastomer, 1-2% vulcanizing agent, 1-3% crosslinking agent, 14.5-22.5% plasticizer, 5-10% gas barrier agent, and 0.5% antiblocking agent, and hot melt extrude and pelletize through a single-screw or twin-screw extruder; S2. Turn on the heating and cooling systems of the twin-screw extruder and set the temperatures of each feeding zone and each die head; S3. After the temperatures of each zone reach the set temperatures and the main machine current is stable, pump the pellets into the plastic extruder, turn on the feeding, start the three rolls, drawing, and start; melt the rubber strip and extrude it through the twin-screw extruder, form it by three-roll extrusion, and automatically measure the thickness; S4. Transport the self-adhesive glue through a pipeline, coat it with a coating die head, and uniformly coat it on the sheet layer to form a self-adhesive layer; S5. Cover it with an insulating material to obtain a gas-isolated ethylene propylene diene monomer (EPDM) self-adhesive coil.

[0015] Based on the above technical solutions, the embodiments of the present invention can at least produce the following technical effects: (1) For the gas-isolated EPDM self-adhesive coil provided by the present invention, the sheet layer provides durability, excellent physical and mechanical properties, and a certain degree of gas barrier property; the self-adhesive layer provides a certain degree of flame retardancy and good adhesiveness. Through the composite structure of the sheet layer, the self-adhesive layer, and the insulating layer, the durability, physical and mechanical properties, a certain degree of flame retardancy, convenient construction performance, and excellent gas isolation performance of the EPDM self-adhesive coil are ensured.

[0016] (2) The gas-isolated EPDM self-adhesive coil provided by the present invention has a strong shielding ability for polar small molecule substances such as water, carbon dioxide, gasoline, and non-polar small molecule substances such as oxygen and methane. The waterproof effect and gas isolation effect are very good. Its physical properties fully meet the production and construction requirements, and it has a certain degree of flame retardancy, excellent gas isolation and airtightness. Moreover, it is simple to process and convenient to construct, and can be well applied to tunnel, coal mine, and underground construction of building structures. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 is a schematic structural diagram of an embodiment of the present invention; In the figure: 1. Insulating layer; 2. Insulating layer; 3. Sheet layer. Detailed Embodiments

[0019] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, characteristics, and implementation schemes of the present invention.

[0020] It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention. Additionally, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0021] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Although this invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of this invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the said documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0022] Without departing from the scope or spirit of this invention, various improvements and changes can be made to the specific embodiments of the description of this invention, which are obvious to those skilled in the art. Other embodiments obtained from the description of this invention are obvious to those skilled in the art. The description and examples of this invention are merely exemplary.

[0023] Regarding the use of "comprising", "including", "having", "containing", etc. herein, they are all open-ended terms, meaning including but not limited to.

[0024] Example 1 As Figure 1 shown, it is composed of a sheet layer 3, a self-adhesive layer 2, and an isolation layer 1. The sheet layer 1 is the bottom layer, the self-adhesive layer 2 is coated on the sheet layer 1 as the middle layer, and an isolation material is also coated on the self-adhesive layer 2 as the isolation layer 3.

[0025] The sheet layer is specifically composed of the following materials by weight percentage: 40 - 55% ethylene propylene diene monomer (EPDM), 10 - 20% polyethylene, 5 - 10% thermoplastic elastomer, 1 - 2% vulcanizing agent, 1 - 3% cross-linking agent, 14.5 - 22.5% plasticizer, 5 - 10% gas barrier agent, 0.5% antiblocking agent.

[0026] Preparation of a gas isolation EPDM self-adhesive coil: Mix the prepared raw materials: ethylene propylene diene monomer (EPDM), polyethylene, thermoplastic elastomer, vulcanizing agent, cross-linking agent, plasticizer, gas barrier agent, antiblocking agent evenly, and hot melt extrude and pelletize through a single-screw or twin-screw extruder; The temperature of the hot melt pelletizing area is 90 - 160 °C, the die head temperature is 180 - 215 °C, and the vacuum pressure is 0.2 - 0.4 MPa; (3) Turn on the heating and cooling systems of the twin-screw extruder, set the temperatures of each feeding zone and each die head, the feeding zone temperature is 80 - 165 °C, the die head temperature is 160 - 185 °C, and the vacuum pressure is 0.2 - 0.4 MPa; (4)After the temperature of each area reaches the set temperature and the main machine current is stable, the obtained particles are pumped into a plastic extruder, the feeding is started, and the three-roll, traction, and start are carried out; the rubber strip is extruded through a twin-screw extruder by hot melting, formed by three-roll extrusion, and the thickness is automatically measured; (5)The self-adhesive glue is transported through a pipeline and coated by a coating die head, and is evenly coated on the sheet layer to form a self-adhesive layer, and the thickness of the glue layer is ≥0.25 mm; (6)Cover with an isolating material to complete the preparation of the gas-isolating ethylene propylene diene monomer (EPDM) self-adhesive coil.

[0027] The physical properties of the above-prepared gas-isolating EPDM self-adhesive coil are tested according to the requirements of GB / T 18173.1-2012, the flame retardant performance is determined according to UL-94, and the gas barrier performance is determined according to the test method for gas permeability of plastic films and sheets in GB / T 1038-2000. The results are shown in Table 1: Table 1 In addition to the properties shown in Table 1, the alkali resistance, water impermeability, heat air aging, heating shrinkage amount, and artificial weathering performance of the gas-isolating EPDM self-adhesive coil all meet the requirements of GB / T 18173.1-2012.

[0028] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A gas-isolated ethylene propylene diene monomer (EPDM) self-adhesive coil, characterized in that, It is composed of a sheet layer, a self-adhesive layer, and a release layer. The sheet layer is the bottom layer. The self-adhesive layer is coated on the sheet layer as the middle layer. An isolation material is also coated on the self-adhesive layer as the release layer. The sheet layer is composed of ethylene propylene diene monomer (EPDM), polyethylene, thermoplastic elastomer, vulcanizing agent, crosslinking agent, plasticizer, gas barrier agent, and anti-blocking agent.

2. The ethylene propylene diene monomer self-adhesive coil for gas isolation according to claim 1, characterized in that Specifically, the sheet layer is composed of the following materials by weight percentage: 40-55% ethylene propylene diene monomer (EPDM), 10-20% polyethylene, 5-10% thermoplastic elastomer, 1-2% vulcanizing agent, 1-3% crosslinking agent, 14.5-22.5% plasticizer, 5-10% gas barrier agent, and 0.5% anti-blocking agent.

3. The ethylene propylene diene monomer (EPDM) self-adhesive coil for gas isolation according to claim 1, wherein The ethylene propylene diene monomer (EPDM) is one or a combination of ethylene propylene diene monomer (EPDM) obtained by solution polymerization and ethylene propylene diene monomer (EPDM) obtained by gas phase polymerization.

4. The ethylene propylene diene monomer self-adhesive coil for gas isolation according to claim 1, characterized in that The polyethylene is high-density polyethylene, and the thermoplastic elastomer is an ethylene-propylene block copolymer with a propylene content of 14-17%.

5. The ethylene propylene diene monomer (EPDM) self-adhesive coil for gas isolation according to claim 1, wherein The plasticizer is one or a combination of paraffin oil, naphthenic oil, and aromatic oil.

6. The ethylene propylene diene monomer self-adhesive coil for gas isolation according to claim 1, characterized in that The vulcanizing agent is sulfur, the gas barrier agent is ethylene-vinyl alcohol copolymer, and the anti-blocking agent is silica.

7. The ethylene propylene diene monomer (EPDM) self-adhesive coil for gas isolation according to claim 1, characterized in that The self-adhesive layer is obtained by coating self-adhesive glue on the sheet layer, and the isolation material is a silicone-coated release film.

8. The preparation method of the gas-isolated EPDM self-adhesive coil according to any one of claims 1-7, characterized in that, It includes the following steps: S1. Mix 40-55% ethylene propylene diene monomer (EPDM), 10-20% polyethylene, 5-10% thermoplastic elastomer, 1-2% vulcanizing agent, 1-3% crosslinking agent, 14.5-22.5% plasticizer, 5-10% gas barrier agent, and 0.5% anti-blocking agent, and carry out hot melt extrusion and pelletizing through a single-screw or twin-screw extruder. S2. Turn on the heating and cooling systems of the twin-screw extruder and set the temperatures of each feeding zone and each die head. S3. After the temperatures of each zone reach the set temperature and the main machine current is stable, suck the produced pellets into the plastic extruder, turn on the feeding, three-roll, traction, and start; the rubber strip is hot-melt extruded through the twin-screw extruder, formed by three-roll extrusion, and the thickness is automatically measured. S4. The self-adhesive glue is transported through a pipeline and coated by a coating die head, and evenly coated on the sheet layer to form a self-adhesive layer. S5. Cover with an isolation material to obtain a gas isolation EPDM self-adhesive coil.

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