CN112940381A - Multilayer geomembrane and preparation method thereof - Google Patents
Multilayer geomembrane and preparation method thereof Download PDFInfo
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- CN112940381A CN112940381A CN202110282743.2A CN202110282743A CN112940381A CN 112940381 A CN112940381 A CN 112940381A CN 202110282743 A CN202110282743 A CN 202110282743A CN 112940381 A CN112940381 A CN 112940381A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
Abstract
The invention discloses a multilayer geomembrane and a preparation method thereof. Through the combined action of the single-screw extruder and the double-screw extruder, the top thorn of a hard object can be effectively resisted by the foaming buffer layer wrapping barrier layer, and the geomembrane can be ensured to be intact in the construction process. Meanwhile, the number of layers of the reinforced barrier layer is increased, the waterproof and anti-seepage performance of the geomembrane can be obviously improved, and the geomembrane prepared by the method has the advantages of excellent puncture resistance, excellent barrier performance, simple preparation process and easier construction compared with the existing product.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to a multilayer geomembrane and a preparation method thereof.
Background
Geomembranes (waterproof boards) are used as the most important anti-seepage materials and are widely applied to the fields of highway tunnels, railway tunnels, refuse landfills, mine landfills, environmental management, aquaculture, roof waterproofing and the like. The geomembranes (waterproof boards) existing in the market mainly comprise high-density polyethylene geomembranes, linear low-density polyethylene waterproof boards, polyvinyl chloride waterproof boards and ethylene-vinyl acetate copolymer waterproof boards, which are extruded by a single-screw extruder and then are subjected to calendering or tape casting molding, and are easily punctured by hard objects such as gravels, soil residues, reinforcing steel bars and the like in the construction process to influence the waterproof and anti-seepage effects of the engineering, so that the service life and the safety of the engineering are influenced. Therefore, it is very important how to improve the puncture resistance and other mechanical properties of the polymer geomembrane.
Disclosure of Invention
The invention aims to provide a multilayer geomembrane with excellent puncture resistance, excellent barrier property and simple preparation process and a preparation method thereof.
The multilayer geomembrane consists of a foaming buffer layer and a reinforced barrier layer, wherein the foaming buffer layer is arranged on the upper side and the lower side of the reinforced barrier layer, and the thickness ratio of the foaming layer to the reinforced barrier layer is 1:2: 1.
The multilayer geomembrane comprises the following raw materials in parts by weight: 100 parts of reinforced barrier layer material, 100 parts of foaming buffer layer material and 0.5 part of foaming master batch.
The material of the reinforced barrier layer is two or three mixtures of polyethylene, polypropylene, ethylene-octene copolymer, ethylene-vinyl acetate copolymer or polyethylene glycol terephthalate;
the material of the foaming buffer layer is one of microcellular foaming polyethylene, polypropylene, ethylene octene copolymer (POE), ethylene-vinyl acetate copolymer (EVA) or polyurethane elastomer.
The multilayer geomembrane is characterized in that the diameter of the foam buffer layer material is 1-50 mu m.
The multilayer geomembrane is characterized in that the polyethylene is one or two of high density polyethylene and linear low density polyethylene.
The multilayer geomembrane is characterized in that the reinforced barrier layer material comprises 60-90 parts by weight of matrix phase and 10-40 parts by weight of dispersed phase.
The preparation method of the multilayer geomembrane comprises the following steps:
(1) putting the material of the reinforced barrier layer into a double-screw extruder at the speed of 20-25rpm, wherein the rotating speed of the screw of the extruder is 280rpm, the temperature of each section is 170-;
(2) placing the foaming layer material into a side single-screw extruder to obtain a microporous foaming buffer layer, wherein the temperature of each section of the extruder is 100-230 ℃, and the rotating speed of the screw is 70 rpm;
(3) and the microcellular foamed buffer layer enters a slit die head, is subjected to composite extrusion on the upper surface and the lower surface of the multiphase reinforced barrier layer through a flow channel, is subjected to three-roll calendering, and is drawn to a wind-up roll through a drawing roll to prepare the multilayer geomembrane.
The invention relates to a preparation device of a multilayer geomembrane, which consists of a double-screw extruder, a layer multiplier, a single-screw extruder, a melt pump, a slit die head, a three-roller machine, a traction roller and a winding roller, wherein the melt pump is connected between the double-screw extruder and the layer multiplier, the outlet of the layer multiplier is connected with the slit die head, the single-screw extruder is arranged on one side of the slit die head, and the traction roller and the winding roller are arranged on the other side of the three-roller machine.
In the above apparatus for manufacturing a multilayer geomembrane, the number of layers of the layer multiplier is 2n（n=1-11）。
Compared with the prior art, the invention has obvious beneficial effects, and the technical scheme can show that: according to the invention, the single-screw extruder and the double-screw extruder share the effect, so that the foaming buffer layer wraps the upper side and the lower side of the multiphase reinforced barrier layer to form the buffer protective layer, the top prick of a hard object can be effectively resisted, and the geomembrane can be ensured to be intact in the construction process. Meanwhile, the number of layers of the reinforced barrier layer is increased, the waterproof and anti-seepage performance of the geomembrane can be obviously improved, and the geomembrane prepared by the method has the advantages of excellent puncture resistance, excellent barrier performance, simple preparation process and easier construction compared with the existing product.
Drawings
Fig. 1 is a view of the structure of a multilayer geomembrane of the present invention;
FIG. 2 is a schematic structural view of a multilayer geomembrane co-extrusion device according to the present invention;
the labels in the figure are:
1. a twin screw extruder; 2. a single screw extruder; 3. a layer multiplier; 4. a melt pump; 5. a slot die head; 6. three-roll machines (calender rolls); 7. a traction roller; 8. geomembrane coiled material; 9. and (7) winding the roller.
Detailed Description
The following detailed description of the embodiments, structures, features and effects of the multi-layer geomembrane and the method for manufacturing the same according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Example 1
A method for preparing a multilayer geomembrane, comprising the steps of:
(1) uniformly mixing 80 parts of high-density polyethylene and 20 parts of linear low-density polyethylene serving as a material of the reinforced barrier layer, putting the mixture into a double-screw extruder 1 at a speed of 20-25rpm, wherein the rotating speed of a screw of the extruder is 280rpm, the temperature of the extruder 1 is 170 ℃, the temperature of the extruder 2 is 190 ℃, the temperature of the extruder 3 is 210 ℃, the temperature of the extruder 4 is 210 ℃, the temperature of the extruder 5 is 210 ℃ and the temperature of the extruder 6 is 210 ℃, pumping the molten extrusion material into a layer multiplier 3 and a slit die head 5 which are at 210 ℃ through a melt pump 4, and the pressure before the melt pump 4 is 18-25MPa and the pressure after the pump is 12-17 MPa;
(2) uniformly mixing 100 parts of ethylene-octene copolymer (POE) and 0.5 part of foaming master batch of a foaming layer material, and putting the mixture into a lateral single-screw extruder 2, wherein the temperature of 1 section of the extruder is 100 ℃, the temperature of 2 sections is 130 ℃, the temperature of 3 sections is 150 ℃, the temperature of 4 sections is 150 ℃, the temperature of 5 sections is 150 ℃, and the rotation speed of a screw is 70 rpm;
(3) after entering a slit die head 5, the microcellular foamed buffer layer is compositely extruded on the upper surface and the lower surface of the multiphase reinforced barrier layer through a runner, and is then rolled by a three-roller machine 6 and then is drawn to a wind-up roll 9 by a drawing roll 7 to be rolled to obtain the multilayer geomembrane.
Example 2
A method for preparing a multilayer geomembrane, comprising the steps of:
(1) uniformly mixing 85 parts of polyethylene terephthalate serving as a material of the reinforced barrier layer and 15 parts of ethylene octene copolymer (POE), putting the mixture into a double-screw extruder 1 at a speed of 20-25rpm, wherein the speed of the extruder is 280rpm, the temperature of the extruder 1 is 210 ℃, the temperature of the extruder 2 is 235 ℃, the temperature of the extruder 3 is 260 ℃, the temperature of the extruder 4 is 260 ℃, the temperature of the extruder 5 is 260 ℃ and the temperature of the extruder 6 is 255 ℃, and the molten extrusion material is pumped into a layer multiplier 3 and a slit die head 5 which are 255 ℃ through a melt pump 4, wherein the pressure before the melt pump 4 is 18-25MPa, and the pressure after the pump is 12-17 MPa;
(2) uniformly mixing 100 parts of ethylene-octene copolymer (POE) and 0.5 part of foaming master batch of a foaming layer material, and putting the mixture into a lateral single-screw extruder 2, wherein the temperature of 1 section of the extruder is 100 ℃, the temperature of 2 sections is 130 ℃, the temperature of 3 sections is 150 ℃, the temperature of 4 sections is 150 ℃, the temperature of 5 sections is 150 ℃, and the rotation speed of a screw is 70 rpm;
(3) after entering a slit die head 5, the microcellular foamed buffer layer is compositely extruded on the upper surface and the lower surface of the reinforced barrier layer through a runner, and is then rolled by a three-roller machine 6, and then is drawn by a drawing roll 7 to a wind-up roll 9 for rolling to obtain the multilayer geomembrane.
Example 3
A method for preparing a multilayer geomembrane, comprising the steps of:
(1) uniformly mixing 70 parts of linear low-density polyethylene, 20 parts of high-density polyethylene and 10 parts of ethylene-vinyl acetate copolymer (EVA) as a material for the reinforced barrier layer, putting the mixture into a double-screw extruder 1 at a speed of 20-25rpm, wherein the speed of the extruder is 280rpm, the temperature of the extruder 1 section is 170 ℃, the temperature of the extruder 2 section is 190 ℃, the temperature of the extruder 3 section is 210 ℃, the temperature of the extruder 4 section is 210 ℃, the temperature of the extruder 5 section is 210 ℃, and the temperature of the extruder 6 section is 210 ℃, pumping the molten extrusion material into a layer multiplier 3 and a slit die head 5 at 210 ℃ through a melt pump 4, the pressure before the melt pump 4 is 18-25MPa, and the pressure after the pump is 12-17 MPa;
(2) uniformly mixing 100 parts of ethylene-vinyl acetate copolymer and 0.5 part of foaming master batch of a foaming layer material, putting the mixture into a lateral single-screw extruder 2, wherein the temperature of a screw rod 1 section of the extruder is 120 ℃, the temperature of a screw rod 2 section is 140 ℃, the temperature of a screw rod 3 section is 150 ℃, the temperature of a screw rod 4 section is 150 ℃, the temperature of a screw rod 5 section is 150 ℃, and the rotating speed of the screw rod is 70 rpm;
(3) after entering a slit die head 5, the microcellular foamed buffer layer is compositely extruded on the upper surface and the lower surface of the reinforced barrier layer through a runner, and is then rolled by a three-roller machine 6, and then is drawn by a drawing roll 7 to a wind-up roll 9 for rolling to obtain the multilayer geomembrane.
Performance index (thickness 1.0mm as an example):
the foregoing is a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any simple modification, equivalent change and modification made to the foregoing embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention without departing from the technical solution of the present invention.
Claims (8)
1. A multilayer geomembrane comprises a foaming buffer layer and a reinforced barrier layer, wherein the foaming buffer layer is arranged on the upper side and the lower side of the reinforced barrier layer, and the thickness ratio of the foaming layer to the reinforced barrier layer is 1:2: 1.
2. The multilayer geomembrane as claimed in claim 1, which comprises the following raw materials in parts by weight:
100 parts of reinforced barrier layer material, 100 parts of foaming buffer layer material and 0.5 part of foaming master batch;
the material of the reinforced barrier layer is two or three mixtures of polyethylene, polypropylene, ethylene-octene copolymer, ethylene-vinyl acetate copolymer or polyethylene glycol terephthalate;
the material of the foaming buffer layer is one of microcellular foaming polyethylene, polypropylene, ethylene octene copolymer, ethylene-vinyl acetate copolymer or polyurethane elastomer.
3. A multilayer geomembrane according to claim 2, wherein: the diameter of the foam pores of the foaming buffer layer material is 1-50 μm.
4. A multilayer geomembrane according to claim 2, wherein: the polyethylene is one or two of high-density polyethylene and linear low-density polyethylene.
5. A multilayer geomembrane according to claim 2, wherein: the reinforced barrier layer material comprises, by weight, 60-90 parts of a matrix phase and 10-40 parts of a dispersed phase.
6. A method of making a multilayer geomembrane according to claim 1, comprising the steps of:
(1) putting the material of the reinforced barrier layer into a double-screw extruder at the speed of 20-25rpm, wherein the rotating speed of the screw of the extruder is 280rpm, the temperature of each section is 170-;
(2) placing the foaming layer material into a side single-screw extruder to obtain a microporous foaming buffer layer, wherein the temperature of each section of the extruder is 100-230 ℃, and the rotating speed of the screw is 70 rpm;
(3) and the microporous foaming buffer layer enters a slit die head, is subjected to composite extrusion on the upper surface and the lower surface of the multiphase reinforced barrier layer through a flow channel, is subjected to three-roll calendering, and is drawn to a wind-up roll through a drawing roll to prepare the multilayer geomembrane.
7. The preparation device of a multilayer geomembrane as claimed in claim 1, which consists of a double-screw extruder (1), a layer multiplier (3), a single-screw extruder (2), a melt pump (4), a slit die head (5), a three-roller machine (6), a traction roller (7) and a wind-up roller (9), wherein the melt pump (4) is connected between the double-screw extruder (1) and the layer multiplier (3), the outlet of the layer multiplier (3) is connected with the slit die head (5), the single-screw extruder (2) is arranged on one side of the slit die head (5), and the traction roller (7) and the wind-up roller (9) are arranged on the other side of the three-roller machine (6).
8. The apparatus for manufacturing a multi-layer geomembrane according to claim 7, wherein: the number of layers of the layer multiplier is 2n（n=1-11）。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110282743.2A CN112940381A (en) | 2021-03-16 | 2021-03-16 | Multilayer geomembrane and preparation method thereof |
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| CN202110282743.2A CN112940381A (en) | 2021-03-16 | 2021-03-16 | Multilayer geomembrane and preparation method thereof |
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| CN112940381A true CN112940381A (en) | 2021-06-11 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203427298U (en) * | 2013-08-30 | 2014-02-12 | 成都迈科新材料有限公司 | Flexible production line device for multilayer composite material |
| CN107020782A (en) * | 2017-02-28 | 2017-08-08 | 浩阳环境股份有限公司 | Matte HDPE geomembranes and its production technology prepared by a kind of chemical blowing process |
-
2021
- 2021-03-16 CN CN202110282743.2A patent/CN112940381A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203427298U (en) * | 2013-08-30 | 2014-02-12 | 成都迈科新材料有限公司 | Flexible production line device for multilayer composite material |
| CN107020782A (en) * | 2017-02-28 | 2017-08-08 | 浩阳环境股份有限公司 | Matte HDPE geomembranes and its production technology prepared by a kind of chemical blowing process |
Non-Patent Citations (1)
| Title |
|---|
| 匡尚富等: "农业高效用水灌排技术应用研究", vol. 1, 中国农业出版社, pages: 211 - 212 * |
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