CN111070836B - Long-life high-seepage-proofing composite geomembrane and preparation method thereof - Google Patents

Long-life high-seepage-proofing composite geomembrane and preparation method thereof Download PDF

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CN111070836B
CN111070836B CN201911351656.7A CN201911351656A CN111070836B CN 111070836 B CN111070836 B CN 111070836B CN 201911351656 A CN201911351656 A CN 201911351656A CN 111070836 B CN111070836 B CN 111070836B
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seepage
parts
composite geomembrane
resistance
spraying
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CN111070836A (en
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李海娟
刘嘉童
闫富力
韩成强
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Shandong Jinye Geotechnical Material Co ltd
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Shandong Jinye Geotechnical Material Co ltd
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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    • B32B5/022—Non-woven fabric
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    • B32—LAYERED PRODUCTS
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
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Abstract

The invention provides a long-life high-seepage-proofing composite geomembrane which comprises a non-woven fabric layer and a seepage-proofing layer, wherein the puncture resistance strength of the long-life high-seepage-proofing composite geomembrane is 1508-1665N, and the water vapor permeability coefficient K is 0.11-0.31 multiplied by 10‑13g.cm/cm2S.pa; the master batch required by the impermeable layer comprises medium-high density polyethylene, ethylene-vinyl alcohol copolymer, myrcene, filler, vinyl acetate copolymer and coupling agent. The invention also provides a preparation method thereof, which comprises the steps of preparation, spraying, compounding and shaping of the impermeable layer, wherein the spraying is carried out by gluing and spraying the upper surface and the lower surface of the impermeable layer, and the gluing and spraying amount is controlled to be 5-12g/m2The spraying temperature is 37-4 DEG CAt 5 ℃. The composite geomembrane with long service life and high seepage resistance has the advantages of good puncture resistance and seepage resistance, wide application range and great market value.

Description

Long-life high-seepage-proofing composite geomembrane and preparation method thereof
Technical Field
The invention belongs to the technical field of geomembranes, relates to an anti-seepage composite geomembrane, and particularly relates to a long-service-life high-anti-seepage composite geomembrane and a preparation method thereof.
Background
The composite geomembrane, also called a composite impermeable membrane, is divided into a cloth-film and two cloth-films, the width is 4-6m, the weight is 200 + 1500 g/square meter, the physical and mechanical performance indexes such as tensile strength, tear resistance, bursting and the like are high, and the product has the characteristics of high strength, better extensibility, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance, good impermeable performance and the like. Can meet the civil engineering requirements of seepage prevention, isolation, reinforcement, crack prevention, reinforcement and the like in water conservancy, municipal administration, buildings, traffic, subway, tunnel and engineering construction. It is commonly used for the anti-seepage treatment of dams and drainage ditches and the anti-pollution treatment of waste material yards.
Chinese patent application No. CN03151245.3 discloses a method for manufacturing a wide width composite geotextile material, which comprises a. woven fabric, nonwoven fabric roll delivery, b. needling composite base fabric, c. composite base fabric roll delivery, d. bentonite laying, e. bentonite uniformity, f. nonwoven fabric, composite base fabric roll delivery, g. needling composite forming, h. coiling, i. finished product packaging, the whole production process has high safety coefficient, simple production process, low requirement for production equipment, and is beneficial to wide popularization and production to form large-scale batch production.
The Chinese patent with the publication number of 206663903U provides an asphalt-geomembrane composite anti-seepage material, which is characterized in that a first high-density polyethylene geomembrane is laid above a non-woven geotextile layer, a first glass fiber mesh cloth is laid above the first high-density polyethylene geomembrane, a second high-density polyethylene geomembrane is laid above the first glass fiber mesh cloth, a second glass fiber mesh cloth is laid above the second high-density polyethylene geomembrane, and a layered structure of an SBS modified asphalt layer is laid above the second glass fiber mesh cloth; bonding a second glass fiber mesh cloth on the surface of the second high-density polyethylene geomembrane, and compounding an SBS modified asphalt layer; the multilayer structure obtains better anti-seepage effect and stronger structural strength, but the product obtained by multilayer compounding is limited by the layered structure, layers are easy to crack when in use, and the materials of each layer have poor weather resistance, especially low temperature resistance, and the application range is greatly limited.
In summary, the existing composite geomembranes have the following disadvantages: (1) puncture resistance and seepage resistance cannot be improved at the same time; (2) the environmental stress cracking resistance is poor, and the low-temperature brittleness resistance is poor; (3) the service life is short.
Disclosure of Invention
The invention provides a long-life high-seepage-proofing composite geomembrane and a preparation method thereof for solving the technical problems in the prior art, and the following aims are fulfilled:
(1) the long-life high-seepage-proofing composite geomembrane has the advantages of puncture resistance and good seepage-proofing performance;
(2) the long-life high-seepage-proofing composite geomembrane has excellent environmental stress cracking resistance;
(3) the long-life high-seepage-proofing composite geomembrane has excellent low-temperature brittleness resistance;
(4) the composite geomembrane with long service life and high seepage resistance has long service life.
In order to solve the technical problems, the following technical scheme is adopted:
a long-life high-seepage-proofing composite geomembrane with puncture resistance 1508-1665N and water vapor permeability coefficient K of 0.11-0.31 x 10-13g.cm/cm2.s.pa。
The following is a further improvement of the above technical solution:
the composite geomembrane with long service life and high seepage resistance has the environmental stress cracking resistance of 541-.
The long-life high-seepage-proofing composite geomembrane has low-temperature impact resistance temperature ranging from-72 ℃ to-78 ℃.
The invention discloses a preparation method of a long-life high-seepage-proofing composite geomembrane, which comprises the following steps: the method comprises the following steps: preparing the impervious layer, spraying, compounding and shaping.
The spraying is to perform glue applying spraying on the upper surface and the lower surface of the impermeable layer, and the glue applying spraying amount is controlled to be 5-12g/m2The spraying temperature is 37-45 ℃.
And (3) shaping, wherein the rolling pressure is 0.5-5Mpa, and the running speed is 2-3.5 m/min.
And (5) shaping, wherein the water content is less than 5%.
The preparation of the anti-seepage layer comprises the steps of preparing an anti-seepage layer master batch, wherein the anti-seepage layer master batch comprises medium-high density polyethylene, ethylene-vinyl alcohol copolymer, myrcene, filler, vinyl acetate copolymer, coupling agent and antistatic agent.
The preparation of the impermeable layer comprises blow molding, wherein the control of the blow molding extrusion temperature is divided into a front section, a middle section and a rear section which are respectively controlled at 150 ℃, 140 ℃, 185 ℃ and 180 ℃ and 215 ℃.
The blow molding is carried out, the rotating speed of the screw is controlled at 100-125rmd/min, and the blow-up ratio is 2: 3-5.
The required masterbatch of compound geomembrane barrier layer of long-life high prevention of seepage includes: medium and high density polyethylene, ethylene-vinyl alcohol copolymer, myrcene, filler, vinyl acetate copolymer, coupling agent, 4,4,5,5, 5-penta-fluoropentanol, magnesium chloride and antistatic agent.
The master batch required by the long-life high-seepage-proofing composite geomembrane seepage-proofing layer comprises the following components in parts by weight: 110-150 parts of medium-high density polyethylene, 12-25 parts of ethylene-vinyl alcohol copolymer, 20-90 parts of myrcene, 20-90 parts of filler, 2-15 parts of vinyl acetate copolymer, 2-4 parts of coupling agent, 1-4 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.03-1 part of magnesium chloride and 0.1-4 parts of antistatic agent.
The medium-high density polyethylene has the density of 0.961g/cm3The melt flow rate is 0.80g/10min (ASTM D-1238, 190 ℃/2.16 kg), the melting point is 133 ℃, the Vicat softening point is 131 ℃, the brittle temperature is less than-76 ℃, and the yield tensile strength is 32 Mpa.
The vinyl acetate copolymer was imported from dupont, usa under the designation 880 and was blow molded grade 25 KG/bag.
The coupling agent is a mixture of hexafluorobutyl methacrylate and dioctyl acyloxy pyrophosphate, and the mass ratio of the hexafluorobutyl methacrylate to the dioctyl acyloxy pyrophosphate is 13: 5.
The 4,4,5,5, 5-pentafluoropentanol with CAS number 148043-73-6, molecular formula: c5H7F5O, the purity is more than or equal to 98.0 percent.
The filler is a mixture of nano calcium carbonate with pH of 6.5-7, nano attapulgite powder and nano mica powder, and the mass ratio of the nano attapulgite powder to the nano mica powder is 10:0.2: 0.1.
The antistatic agent has effective matter content not less than 98%, amine value 65-75KOHmg/g, volatile matter 2.0%, decomposition temperature higher than 300 deg.c and melting point 53-60 deg.c.
And the blow molding adopts an extrusion film blowing machine set to blow a film, and the extrusion temperature is gradually increased according to the direction from a feeding port to a machine head.
The blow molding and extrusion process conditions are as follows: the temperature control during extrusion is divided into a front section, a middle section and a rear section, which are respectively controlled at the temperature of 110-; the screw rotation speed is controlled at 100-125rmd/min, and the blow-up ratio is 2: 3-5.
And (3) performing water cooling solidification, namely performing cooling solidification by adopting cold water at the temperature of 4-15 ℃, and controlling the flow rate of the cold water at 17-52L/min to obtain the impermeable layer.
The specific gravity of the impermeable layer is 0.884-0.975g/cm3The elongation at break is more than or equal to 380 percent, the puncture strength is more than or equal to 110N, the heat seal strength is more than or equal to 12, and the haze is less than or equal to 5.5 percent.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the long-life high-seepage-proofing composite geomembrane has the puncture resistance strength of 1508-1665N;
(2) the composite geomembrane with long service life and high seepage resistance has the environmental stress cracking resistance of 541-;
(3) the composite geomembrane with long service life and high seepage resistance passes a low-temperature impact embrittlement test at the temperature of-70 ℃.
(4) The composite geomembrane with long service life and high seepage resistance has the water vapor permeability coefficient KIs 0.11-0.31X 10-13g.cm/cm2.s.pa。
Detailed Description
Embodiment 1 composite geomembrane with long service life and high seepage resistance and preparation method thereof
The composite geomembrane with long service life and high seepage resistance comprises a non-woven fabric layer and a seepage-proof layer, and specifically can consist of one non-woven fabric layer and one seepage-proof layer, or can consist of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle seepage-proof layer. The long-life high-seepage-proofing composite geomembrane in the embodiment consists of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle seepage-proofing layer.
The preparation method of the long-life high-seepage-proofing composite geomembrane comprises the following steps of:
step 1: preparation of the barrier layer
(1) Sorting
The master batch required by the impervious layer in the long-life high-impervious composite geomembrane comprises the following components: medium and high density polyethylene, ethylene-vinyl alcohol copolymer, myrcene, filler, vinyl acetate copolymer, coupling agent, 4,4,5,5, 5-penta-fluoropentanol, magnesium chloride and antistatic agent.
Comprises the following components in parts by weight: 110-150 parts of medium-high density polyethylene, 12-25 parts of ethylene-vinyl alcohol copolymer, 20-90 parts of myrcene, 20-90 parts of filler, 2-15 parts of vinyl acetate copolymer, 2-4 parts of coupling agent, 1-4 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.03-1 part of magnesium chloride and 0.1-4 parts of antistatic agent.
Specifically, the master batch required by the long-life high-seepage-resistance composite geomembrane seepage-proofing layer in the embodiment comprises the following components in parts by weight:
120 parts of medium-high density polyethylene, 25 parts of ethylene-vinyl alcohol copolymer, 20 parts of myrcene, 90 parts of filler, 2 parts of vinyl acetate copolymer, 4 parts of coupling agent, 1 part of 4,4,5,5, 5-penta-fluoropentanol, 1 part of magnesium chloride and 0.1 part of antistatic agent.
The medium-high density polyethylene has the density of 0.961g/cm3Melt flow rate 0.80g/10min (ASTM D-1238, 190 ℃/2.16 kg), melting point 133 ℃, Vicat softening point 131The brittle temperature is less than-76 ℃, and the yield tensile strength is 32 Mpa.
The vinyl acetate copolymer is imported from DuPont, USA, No. 880, and has a specification of blow molding grade, 25 KG/bag;
the coupling agent is a mixture of hexafluorobutyl methacrylate and dioctyl pyrophosphate acyloxy, and the mass ratio of the hexafluorobutyl methacrylate to the dioctyl pyrophosphate acyloxy is 13: 5;
the 4,4,5,5, 5-pentafluropentanol has a CAS number of 148043-73-6 and a molecular formula: c5H7F5O, the purity is more than or equal to 98.0 percent.
The filler is a mixture of nano calcium carbonate with pH of 6.5-7, nano attapulgite powder and nano mica powder in a mass ratio of 10:0.2: 0.1;
the antistatic agent has effective matter content not less than 98%, amine value 65-75KOHmg/g, volatile matter 2.0%, decomposition temperature higher than 300 deg.c and melting point 53-60 deg.c.
(2) Melt extrusion
1) Primary extrusion: mixing the raw materials of the medium-high density polyethylene, the ethylene-vinyl alcohol copolymer, the myrcene, the filler and the vinyl acetate copolymer in proportion, melting at high temperature, and extruding by a single-screw extruder;
the extrusion process conditions are as follows: the extrusion temperature is controlled at 172-175 ℃, the screw rotating speed is controlled at 75rmd/min, and the temperature is kept at 97-100 ℃ after extrusion.
2) Secondary extrusion: then adding a coupling agent, magnesium chloride, an antistatic agent, 4,5, 5-penta-fluoropentanol and gamma-aminopropyl triethoxysilane with the mass accounting for 0.1 percent of the total mass of all the raw materials, uniformly mixing, and then melting, blending and extruding by a double-screw extruder;
the extrusion process conditions are as follows: the extrusion temperature is controlled at 182 ℃ and 185 ℃, the screw rotating speed is controlled at 95rmd/min, and the temperature is kept at 95-97 ℃ after extrusion.
(3) Blow molding
And adopting an extrusion film blowing machine set to blow a film, wherein the extrusion temperature is gradually increased according to the direction from a feeding port to a machine head.
The extrusion process conditions are as follows: the temperature control during extrusion is divided into a front section, a middle section and a rear section, which are respectively controlled at the temperature of 110-; the screw rotation speed is controlled at 100rmd/min, and the blow-up ratio is 2: 5.
(4) Water cooling solidification
And cooling and solidifying by adopting cold water at 4 ℃, and controlling the flow rate of the cold water at 45L/min to obtain the impermeable layer.
The specific gravity of the impermeable layer of the embodiment is detected to be 0.884g/cm3Elongation at break 755%, puncture strength 641N, heat seal strength 16.1, haze 2.05%.
Step 2: spraying device
Conveying the impermeable layer to a spray rack through a conveyor belt, and performing glue application and spraying on the upper surface and the lower surface of the impermeable layer, wherein the glue application and spraying amount is controlled to be 5g/m2The spraying temperature is 45 ℃, the glue used is a mixed solution of a commercially available adhesive and ethanol-water, the mass concentration of the commercially available adhesive is 5%, the commercially available adhesive is purchased from Tantaichi Kawakaki, the product number is 201808009, and the density is 1.19g/cm3。
And 3, step 3: compounding
Selecting a grammage of 80g/m2The non-woven fabrics are used as an upper non-woven fabric layer and a lower non-woven fabric layer, the impermeable layer is used as an intermediate layer to be paved, then the composite belt is formed by compounding through the composite unit, and the composite belt is flattened through the flattening unit of the composite belt production line.
And 4, step 4: shaping
And (3) sequentially carrying out three-time rolling and shaping on the composite strip, adjusting the rolling pressure to 0.8Mpa, and operating at the speed of 3.5m/min, and simultaneously opening drying devices on the upper surface and the lower surface to dry in the process, wherein the water content is controlled to be 5%, so that the long-life high-seepage-proofing composite geomembrane is obtained.
Embodiment 2 long-life high-seepage-proofing composite geomembrane and preparation method thereof
The composite geomembrane with long service life and high seepage resistance comprises a non-woven fabric layer and a seepage-proof layer, and specifically can consist of one non-woven fabric layer and one seepage-proof layer, or can consist of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle seepage-proof layer. The long-life high-seepage-proofing composite geomembrane in the embodiment consists of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle seepage-proofing layer.
The preparation method of the long-life high-seepage-proofing composite geomembrane comprises the following steps of:
step 1: preparation of the barrier layer
(1) Sorting
The master batch required by the impervious layer in the long-life high-impervious composite geomembrane comprises the following components: medium-high density polyethylene, ethylene-vinyl alcohol copolymer, myrcene, filler, vinyl acetate copolymer, coupling agent, 4,4,5,5, 5-penta-fluoropentanol, magnesium chloride and antistatic agent.
Comprises the following components in parts by weight: 110-150 parts of medium-high density polyethylene, 12-25 parts of ethylene-vinyl alcohol copolymer, 20-90 parts of myrcene, 20-90 parts of filler, 2-15 parts of vinyl acetate copolymer, 2-4 parts of coupling agent, 1-4 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.03-1 part of magnesium chloride and 0.1-4 parts of antistatic agent.
Specifically, the master batch required by the long-life high-seepage-resistance composite geomembrane seepage-proofing layer in the embodiment comprises the following components in parts by weight: 125 parts of medium-high density polyethylene, 15 parts of ethylene-vinyl alcohol copolymer, 22 parts of myrcene, 32 parts of filler, 8 parts of vinyl acetate copolymer, 3 parts of coupling agent, 2.0 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.05 part of magnesium chloride and 1.2 parts of antistatic agent.
The medium-high density polyethylene has the density of 0.961g/cm3The melt flow rate is 0.80g/10min (ASTM D-1238, 190 ℃/2.16 kg), the melting point is 133 ℃, the Vicat softening point is 131 ℃, the brittle temperature is less than-76 ℃, and the yield tensile strength is 32 Mpa.
The vinyl acetate copolymer is imported from DuPont, USA, with a trade mark of 880, and has a specification of blow molding grade, 25 KG/bag;
the coupling agent is a mixture of hexafluorobutyl methacrylate and dioctyl pyrophosphate acyloxy, and the mass ratio of the hexafluorobutyl methacrylate to the dioctyl pyrophosphate acyloxy is 13: 5;
the 4,4,5,5, 5-pentafluropentanol has a CAS number of 148043-73-6 and a molecular formula: c5H7F5O, the purity is more than or equal to 98.0 percent.
The filler is a mixture of nano calcium carbonate with pH of 6.5-7, nano attapulgite powder and nano mica powder in a mass ratio of 10:0.2: 0.1;
the antistatic agent has effective matter content not less than 98%, amine value 65-75KOHmg/g, volatile matter 2.0%, decomposition temperature higher than 300 deg.c and melting point 53-60 deg.c.
(2) Melt extrusion
1) Primary extrusion: mixing the raw materials of the medium-high density polyethylene, the ethylene-vinyl alcohol copolymer, the myrcene, the filler and the vinyl acetate copolymer in proportion, melting at high temperature, and extruding by a single-screw extruder;
the extrusion process conditions are as follows: the extrusion temperature is controlled at 183 ℃, the screw rotation speed is controlled at 72rmd/min, and the temperature is kept at 95-97 ℃ after extrusion.
2) Secondary extrusion: then adding a coupling agent, magnesium chloride, an antistatic agent, 4,5, 5-penta-fluoropentanol and gamma-aminopropyl triethoxysilane with the mass accounting for 0.08 percent of the total mass of all the raw materials, uniformly mixing, and then melting, blending and extruding by a double-screw extruder;
the extrusion process conditions are as follows: the extrusion temperature was controlled at 195 deg.C, the screw speed was controlled at 93rmd/min, and the temperature was maintained at 98 deg.C after extrusion.
(3) Blow molding
And adopting an extrusion film blowing machine set to blow a film, wherein the extrusion temperature is gradually increased according to the direction from a feeding port to a machine head.
The extrusion process conditions are as follows: the temperature control during extrusion is divided into a front section, a middle section and a rear section which are respectively controlled at 110-150 ℃, 140-185 ℃ and 180-215 ℃; the screw rotation speed was controlled at 124rmd/min, and the blow-up ratio was 2: 4.
(4) Water cooling solidification
And cooling and solidifying by adopting cold water at the temperature of 5 ℃, and controlling the flow rate of the cold water at 18L/min to obtain the impermeable layer.
The specific gravity of the impermeable layer of the embodiment is 0.892g/cm through detection3875% elongation at break, 669N puncture strength, 18% heat seal strength, 1.22% haze.
And 2, step: spraying device
Conveying the impermeable layer to a spray rack through a conveyor belt, and performing glue application and spraying on the upper surface and the lower surface of the impermeable layer, wherein the glue application and spraying amount is controlled to be 6g/m2The temperature during spraying is 43 ℃, and the glue used is a commercially available glue andthe mixed solution of ethanol and water, the mass concentration of the adhesive sold in the market is 5 percent, the adhesive is purchased from Taiwan tobacco, the goods number is 201808009, and the density is 1.19g/cm3。
And 3, step 3: compounding
Selecting a grammage of 80g/m2The non-woven fabrics are used as an upper non-woven fabric layer and a lower non-woven fabric layer, the impermeable layer is used as a middle layer to be paved, then the composite belt is formed by compounding through the composite unit, and the composite belt is flattened through the flattening unit of the composite belt production line.
And 4, step 4: shaping
And (3) sequentially carrying out three-time rolling and shaping on the composite strip, adjusting the rolling pressure to 2.7Mpa, and operating at the speed of 2.8m/min, and simultaneously opening drying devices on the upper surface and the lower surface to dry in the process, wherein the water content is controlled to be 5%, so that the long-life high-seepage-proofing composite geomembrane is obtained.
Embodiment 3 long-life high-seepage-proofing composite geomembrane and preparation method thereof
The composite geomembrane with long service life and high seepage resistance comprises a non-woven fabric layer and a seepage-proof layer, and specifically can consist of one non-woven fabric layer and one seepage-proof layer, or can consist of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle seepage-proof layer. The long-life high-seepage-proofing composite geomembrane in the embodiment consists of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle seepage-proofing layer.
The preparation method of the long-life high-seepage-proofing composite geomembrane comprises the following steps of:
step 1: preparation of the barrier layer
(1) Sorting
The master batch required by the impervious layer in the long-life high-impervious composite geomembrane comprises the following components: medium and high density polyethylene, ethylene-vinyl alcohol copolymer, myrcene, filler, vinyl acetate copolymer, coupling agent, 4,4,5,5, 5-penta-fluoropentanol, magnesium chloride and antistatic agent.
Comprises the following components in parts by weight: 110-150 parts of medium-high density polyethylene, 12-25 parts of ethylene-vinyl alcohol copolymer, 20-90 parts of myrcene, 20-90 parts of filler, 2-15 parts of vinyl acetate copolymer, 2-4 parts of coupling agent, 1-4 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.03-1 part of magnesium chloride and 0.1-4 parts of antistatic agent.
Specifically, the master batch required by the long-life high-seepage-resistance composite geomembrane seepage-proofing layer in the embodiment comprises the following components in parts by weight:
150 parts of medium-high density polyethylene, 12 parts of ethylene-vinyl alcohol copolymer, 90 parts of myrcene, 20 parts of filler, 15 parts of vinyl acetate copolymer, 2 parts of coupling agent, 4 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.03 part of magnesium chloride and 4 parts of antistatic agent.
The medium-high density polyethylene has the density of 0.961g/cm3The melt flow rate is 0.80g/10min (ASTM D-1238, 190 ℃/2.16 kg), the melting point is 133 ℃, the Vicat softening point is 131 ℃, the brittle temperature is less than-76 ℃, and the yield tensile strength is 32 Mpa.
The vinyl acetate copolymer is imported from DuPont, USA, No. 880, and has a specification of blow molding grade, 25 KG/bag;
the coupling agent is a mixture of hexafluorobutyl methacrylate and dioctyl pyrophosphate acyloxy, and the mass ratio of the hexafluorobutyl methacrylate to the dioctyl pyrophosphate acyloxy is 13: 5;
the 4,4,5,5, 5-pentafluropentanol has a CAS number of 148043-73-6 and a molecular formula: c5H7F5O, the purity is more than or equal to 98.0 percent.
The filler is a mixture of nano calcium carbonate with pH of 6.5-7, nano attapulgite powder and nano mica powder, and the mass ratio of the nano attapulgite powder to the nano mica powder is 10:0.2: 0.1;
the antistatic agent has effective matter content not less than 98%, amine value 65-75KOHmg/g, volatile matter 2.0%, decomposition temperature higher than 300 deg.c and melting point 53-60 deg.c.
(2) Melt extrusion
1) Primary extrusion: mixing the raw materials of the medium-high density polyethylene, the ethylene-vinyl alcohol copolymer, the myrcene, the filler and the vinyl acetate copolymer in proportion, melting at high temperature, and extruding by a single-screw extruder;
the extrusion process conditions are as follows: the extrusion temperature was controlled at 185 ℃ and the screw speed was controlled at 66rmd/min, and the temperature was maintained at 100 ℃ after extrusion.
2) Secondary extrusion: then adding a coupling agent, magnesium chloride, an antistatic agent, 4,5, 5-penta-fluoropentanol and gamma-aminopropyl triethoxysilane with the mass accounting for 0.11 percent of the total mass of all the raw materials, uniformly mixing, and then melting, blending and extruding by a double-screw extruder;
the extrusion process conditions are as follows: the extrusion temperature was controlled at 205 deg.C, the screw speed was controlled at 80rmd/min, and the temperature was maintained at 100 deg.C after extrusion.
(3) Blow molding
And adopting an extrusion film blowing machine set to blow a film, wherein the extrusion temperature is gradually increased according to the direction from a feeding port to a machine head.
The extrusion process conditions are as follows: the temperature control during extrusion is divided into a front section, a middle section and a rear section, which are respectively controlled at the temperature of 110-; the screw rotation speed was controlled at 125rmd/min, and the blow-up ratio was 2: 3.
(4) Water cooling solidification
Cooling and solidifying by adopting cold water with the temperature of 10 ℃, and controlling the flow rate of the cold water at 17L/min to obtain the impermeable layer.
The specific gravity of the impermeable layer of the embodiment is detected to be 0.905g/cm3Elongation at break 736%, puncture strength 647N, heat seal strength 16.1, haze 2.52%.
Step 2: spraying device
Conveying the impermeable layer to a spray rack through a conveyor belt, and performing glue applying and spraying on the upper surface and the lower surface of the impermeable layer, wherein the glue applying and spraying amount is controlled to be 11.2g/m2The spraying temperature is 37-45 ℃, the glue used is a mixed solution of a commercially available adhesive and ethanol-water, the mass concentration of the commercially available adhesive is 5%, the commercially available adhesive is purchased from Tantaichi Kawakaki, the product number is 201808009, and the density is 1.19g/cm3。
And step 3: compounding
Selecting a grammage of 80g/m2The non-woven fabrics are used as an upper non-woven fabric layer and a lower non-woven fabric layer, the impermeable layer is used as a middle layer to be paved, then the composite belt is formed by compounding through the composite unit, and the composite belt is flattened through the flattening unit of the composite belt production line.
And 4, step 4: shaping
And (3) sequentially carrying out three-time rolling and shaping on the composite belt, adjusting the rolling pressure to 5Mpa, and operating at the speed of 2m/min, and simultaneously opening drying devices on the upper surface and the lower surface to dry in the process, so as to control the water content to be 2.5%, thereby obtaining the long-life high-seepage-proofing composite geomembrane.
The invention relates to an effect index of a long-life high-seepage-proofing composite geomembrane
The indexes of the long-life high-seepage-proofing composite geomembrane obtained by the preparation process of the non-woven fabric according to the embodiments 1 to 3 are shown in the following table;
Figure 427589DEST_PATH_IMAGE002
the composite geomembrane with long service life and high seepage resistance, which is obtained by the invention, has superior puncture resistance, environmental stress cracking resistance and low-temperature impact embrittlement resistance; the puncture strength reaches 971N at-70 ℃, and in addition, the service life of the obtained composite geomembrane can reach 40 years. The method specifically comprises the following steps:
(1) the long-life high-seepage-proofing composite geomembrane has the puncture resistance strength of 1508-1665N;
(2) the composite geomembrane with long service life and high seepage resistance has the environmental stress cracking resistance of 541-;
(3) the composite geomembrane with long service life and high seepage resistance passes a low-temperature impact embrittlement test at the temperature of-70 ℃.
(4) The composite geomembrane with long service life and high seepage resistance has the water vapor permeability coefficient K of 0.11-0.31 multiplied by 10-13g.cm/cm2.s.pa。
All percentages used herein are weight percentages and all ratios described herein are mass ratios, unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A long-life high-seepage-proofing composite geomembrane which is characterized in that,
the puncture resistance strength of the composite geomembrane is 1508-1665N, and the water vapor permeability coefficient K is 0.11-0.31 multiplied by 10-13g·cm/cm2·s·pa；
The structure of the composite geomembrane consists of an upper non-woven fabric layer, a lower non-woven fabric layer and a middle impermeable layer;
the preparation method of the composite geomembrane comprises the following steps: preparing, spraying, compounding and shaping the impermeable layer;
the master batch required by the composite geomembrane impervious layer comprises the following components in parts by weight: 110-150 parts of medium-high density polyethylene, 12-25 parts of ethylene-vinyl alcohol copolymer, 20-90 parts of myrcene, 20-90 parts of filler, 2-15 parts of vinyl acetate copolymer, 2-4 parts of coupling agent, 1-4 parts of 4,4,5,5, 5-penta-fluoropentanol, 0.03-1 part of magnesium chloride and 0.1-4 parts of antistatic agent;
the medium-high density polyethylene has the density of 0.961g/cm3(ii) a The melt flow rate was measured according to ASTM D-1238, 190 ℃/2.16kg at 0.80g/10 min; the melting point is 133 ℃, the Vicat softening point is 131 ℃, the brittle temperature is less than-76 ℃, and the yield tensile strength is 32 Mpa;
the vinyl acetate copolymer is imported from DuPont, USA, No. 880, and has a specification of blow molding grade, 25 KG/bag;
the coupling agent is a mixture of hexafluorobutyl methacrylate and dioctyl pyrophosphate acyloxy, and the mass ratio of the hexafluorobutyl methacrylate to the dioctyl pyrophosphate acyloxy is 13: 5;
the 4,4,5,5, 5-pentafluropentanol has a CAS number of 148043-73-6 and a molecular formula: c5H7F5O, the purity is more than or equal to 98.0 percent;
the filler is a mixture of nano calcium carbonate with pH of 6.5-7, nano attapulgite powder and nano mica powder, and the mass ratio of the nano attapulgite powder to the nano mica powder is 10:0.2: 0.1;
the antistatic agent has the effective substance content of more than or equal to 98 percent, the amine value of 65-75KOHmg/g, the volatile matter of 2.0 percent, the decomposition temperature of more than 300 ℃ and the melting point of 53-60 ℃;
the preparation of the impermeable layer comprises blow molding, wherein the blow molding extrusion temperature is controlled to be divided into a front section, a middle section and a rear section which are respectively controlled at 110-;
the blow molding is carried out, the rotating speed of a screw is controlled at 100-125rmd/min, and the blow-up ratio is 2: 3-5;
the preparation of the impermeable layer also comprises water cooling solidification, wherein cold water with the temperature of 4-15 ℃ is adopted for cooling solidification, and the flow rate of the cold water is controlled at 17-52L/min, so that the impermeable layer is obtained.
2. The composite geomembrane with long service life and high seepage resistance as claimed in claim 1,
the composite geomembrane with long service life and high seepage resistance has environmental stress cracking resistance of 541-.
3. The composite geomembrane with long service life and high seepage resistance as claimed in claim 1,
the composite geomembrane with long service life and high seepage resistance has low temperature impact resistance ranging from-72 ℃ to-78 ℃.
4. The composite geomembrane with long service life and high seepage resistance as claimed in claim 1,
the spraying is to perform glue applying spraying on the upper surface and the lower surface of the impermeable layer, and the glue applying spraying amount is controlled to be 5-12g/m2The spraying temperature is 37-45 ℃.
5. The composite geomembrane with long service life and high seepage resistance as claimed in claim 1,
and (3) shaping, wherein the rolling pressure is 0.5-5Mpa, and the running speed is 2-3.5 m/min.
6. The long-life high-seepage-proofing composite geomembrane according to claim 1,
and (5) setting, wherein the water content is less than 5%.
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CN201033869Y (en) * 2007-05-24 2008-03-12 谈士军 Weaving nonwoven composite geomembrane
CN107323009A (en) * 2017-07-06 2017-11-07 中国电建集团华东勘测设计研究院有限公司 A kind of many membranous type composite geo-membranes of many cloth of high permeability resistance and preparation method thereof
CN109866490A (en) * 2019-01-24 2019-06-11 鲍可可 A kind of MULTILAYER COMPOSITE geomembrane and preparation method thereof for soil remediation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1833866A (en) * 2006-04-17 2006-09-20 管昆明 Processing-shaping method of composite upper membrane
CN201033869Y (en) * 2007-05-24 2008-03-12 谈士军 Weaving nonwoven composite geomembrane
CN107323009A (en) * 2017-07-06 2017-11-07 中国电建集团华东勘测设计研究院有限公司 A kind of many membranous type composite geo-membranes of many cloth of high permeability resistance and preparation method thereof
CN109866490A (en) * 2019-01-24 2019-06-11 鲍可可 A kind of MULTILAYER COMPOSITE geomembrane and preparation method thereof for soil remediation

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