CN-119858372-B - High-puncture-resistance polyethylene geomembrane and production device and production process thereof

CN119858372BCN 119858372 BCN119858372 BCN 119858372BCN-119858372-B

Abstract

The application discloses a high puncture-resistant polyethylene geomembrane, a production device and a production process thereof, and belongs to the technical field of geomembranes. The high puncture-resistant polyethylene geomembrane comprises, from top to bottom, an upper layer membrane, a first middle layer membrane, an inner layer membrane, a second middle layer membrane and a lower layer membrane, wherein the upper layer membrane and the lower layer membrane comprise, by weight, 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of double black-resistant master batches, the first middle layer membrane and the second middle layer membrane comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin and 2-10 parts of double black-resistant master batches, and the inner layer membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin and 2-10 parts of double black-resistant master batches. The application relates to a polyethylene geomembrane with a symmetrical five-layer membrane structure by taking an inner layer membrane as a center, and specifically limits the components of each layer and the proportion relation among the components, and synchronously improves the puncture resistance and the environmental stress cracking resistance of the polyethylene geomembrane so as to meet the requirements of seepage-proofing engineering in severe environments.

Inventors

LI HONGZHEN
ZHAO HENGKAI
GAO DEQIANG
ZHAO KUILI

Assignees

浩阳环境股份有限公司

Dates

Publication Date: 20260505
Application Date: 20241224

Claims (8)

1. The production process of the polyethylene geomembrane with high puncture resistance is characterized by comprising the following steps of: S1, extracting raw materials from a first bin, a second bin, a third bin, a fourth bin and a fifth bin by a first quantitative feeder, a second quantitative feeder, a third quantitative feeder, a fourth quantitative feeder and a fifth quantitative feeder according to the proportion, fully mixing, and respectively feeding the raw materials into a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder and a fifth screw melt extruder through a first hopper, a second hopper, a third hopper, a fourth hopper and a fifth hopper; S2, extruding molten raw materials by a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder and a fifth screw melt extruder, respectively entering a split fluid through a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe and a fifth connecting pipe, conveying the split fluid to a five-layer forming die to form a flowing melt, and extruding the flowing melt through the five-layer forming die to obtain cylindrical film bubbles; S3, lifting the cylindrical film bubble to a first tractor, and forming a closed cylindrical cavity between the five-layer forming die and the first tractor, wherein an air inlet fan injects air into the cylindrical cavity, an air outlet fan discharges the air in the cylindrical cavity, and the air inlet fan and the air outlet fan are controlled according to a transverse draft ratio of 1 (1.2-1.4) so as to form the cylindrical cavity with a stable diameter; S4, controlling the traction speed by a first traction machine according to a longitudinal traction ratio of 1 (1.2-1.4) to form a cylindrical cavity with stable thickness, cutting the cylindrical cavity by a cutting knife assembly, unfolding the cylindrical cavity by a membrane unfolding frame to form a geomembrane with stable breadth and stable thickness, and cutting the geomembrane into rolls by a friction rolling machine after traction by a second traction machine, a membrane storage frame and a third traction machine to obtain the high puncture-resistant polyethylene geomembrane; The high puncture-resistant polyethylene geomembrane comprises, from top to bottom, an upper layer membrane, a first middle layer membrane, an inner layer membrane, a second middle layer membrane and a lower layer membrane, wherein the upper layer membrane and the lower layer membrane comprise, by weight, 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of double black master batches, the first middle layer membrane and the second middle layer membrane comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin and 2-10 parts of double black master batches, and the inner layer membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin and 2-10 parts of double black master batches; the modified linear low-density polyethylene resin comprises, by weight, 80-100 parts of linear low-density polyethylene, 5-15 parts of modified nano silicon dioxide, 5-10 parts of nano titanium dioxide, 2-8 parts of maleic anhydride grafted polyethylene, 0.5-1.5 parts of an antioxidant and 0.05-0.1 part of an ultraviolet absorbent, wherein the modified nano silicon dioxide is prepared by modifying a silane coupling agent.
2. The process for producing a high puncture-resistant polyethylene geomembrane according to claim 1, wherein the preparation method of the modified nano-silica comprises the following steps: (1) Dispersing nano silicon dioxide in ethanol to obtain nano silicon dioxide dispersion liquid; (2) Adding a silane coupling agent into the nano silicon dioxide dispersion liquid, and heating and stirring; (3) Centrifuging and vacuum drying to obtain the modified nano silicon dioxide.
3. The production process of the high puncture-resistant polyethylene geomembrane according to claim 1, wherein in S2, the length-diameter ratio of the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder and the fifth screw melt extruder is 35:1, the feeding section temperature is 175-185 ℃, the compression section temperature is 195-205 ℃, the metering section temperature is 185-195 ℃, the diameter d1=120 mm of the first screw melt extruder, the diameter d2=150 mm of the second screw melt extruder, the diameter d3=180 mm of the third screw melt extruder, the diameter d4=150 mm of the fourth screw melt extruder and the diameter d5=120 mm of the fifth screw melt extruder.
4. The production device for implementing the production process of the high puncture-resistant polyethylene geomembrane according to any one of claims 1 to 3 is characterized by sequentially comprising a centralized feeding mechanism, a melt extrusion mechanism, a die forming mechanism, an internal cooling control mechanism and a traction coiling mechanism, wherein the centralized feeding mechanism comprises a first feeding assembly, a second feeding assembly, a third feeding assembly, a fourth feeding assembly and a fifth feeding assembly, and the first feeding assembly, the second feeding assembly, the third feeding assembly, the fourth feeding assembly and the fifth feeding assembly.
5. The production device according to claim 4, wherein the first feeding assembly comprises a first bin, a first quantitative feeder and a first hopper, the second feeding assembly comprises a second bin, a second quantitative feeder and a second hopper, the third feeding assembly comprises a third bin, a third quantitative feeder and a third hopper, the fourth feeding assembly comprises a fourth bin, a fourth quantitative feeder and a fourth hopper, and the fifth feeding assembly comprises a fifth bin, a fifth quantitative feeder and a fifth hopper, and the first hopper, the second hopper, the third hopper, the fourth hopper and the fifth hopper are respectively arranged below the first quantitative feeder, the second quantitative feeder, the third quantitative feeder, the fourth quantitative feeder and the fifth quantitative feeder.
6. The apparatus for producing according to claim 5, wherein the melt extrusion mechanism comprises a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder, and a fifth screw melt extruder, and the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder are disposed below the first hopper, the second hopper, the third hopper, the fourth hopper, and the fifth hopper, respectively.
7. The apparatus for producing according to claim 4, wherein the die forming mechanism comprises a connecting pipe assembly, a split body, a five-layer forming die and a propeller strut, wherein the connecting pipe assembly comprises a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe and a fifth connecting pipe, wherein the first connecting pipe, the second connecting pipe, the third connecting pipe, the fourth connecting pipe and the fifth connecting pipe are respectively communicated with a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder, a fifth screw melt extruder and the split body, and wherein the split body is communicated with the five-layer forming die.
8. The production device of claim 4, wherein the internal cooling control mechanism comprises an air inlet machine, an air outlet machine, a breadth probe, an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with the air inlet machine and the five-layer forming die, the air outlet pipe is communicated with the air outlet machine and the five-layer forming die, the traction rolling mechanism sequentially comprises a first traction machine, a slitting assembly, an upper guide roller, a film spreading frame, a lower guide roller, a second traction machine, a film storage frame, a third traction machine and a friction rolling machine, the slitting assembly comprises a slitting knife and a slitting knife support, the five-layer forming die comprises a die body, an air inlet and an air outlet, flow channels are arranged in the die body, the flow channels comprise a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel, and the first flow channel, the second flow channel, the third flow channel, the fourth flow channel and the fifth flow channel are respectively communicated with a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe and a fifth connecting pipe.

Description

High-puncture-resistance polyethylene geomembrane and production device and production process thereof Technical Field The application relates to a high puncture-resistant polyethylene geomembrane, a production device and a production process thereof, and belongs to the technical field of geomembranes. Background At present, the flexible cushion layer which is applied to the seepage prevention of refuse sanitary landfill, tailing pond seepage prevention and the like and is used as a main seepage prevention layer is mainly a polyethylene geomembrane. In some seepage-proofing projects, foundation conditions are not ideal, a plurality of sharp-angle gravels exist in a compacted soil layer, a great risk of forming holes exists in the laying process of a geomembrane, the environment conditions are complex, the environment stress cracking resistance of the geomembrane is a great test, in addition, after a protective layer is laid on the geomembrane, a percolate gravels guiding layer is generally laid above the geotechnical cloth, sharp-angle gravels possibly exist in the gravels, although the geotechnical cloth is used as the protective layer, the safety coefficient of the integrity of the geomembrane is greatly reduced under the high-pressure of a garbage pile, on the other hand, for seepage prevention of the landfill, the backfill garbage is not free from the existence of sharp objects after the operation of the landfill, and the puncture resistance of the geomembrane is more required under the high-pressure of the garbage pile. The composite geomembrane in the prior art is prepared by selecting high-density polyethylene or linear low-density polyethylene as raw materials, screening, cleaning, drying and the like, and then sending the raw materials into an extruder. Therefore, how to provide a polyethylene geomembrane with puncture resistance and environmental stress cracking resistance meeting the requirements of severe environment seepage prevention engineering is a problem to be solved. Disclosure of Invention In order to solve the problems, the application provides a high puncture-resistant polyethylene geomembrane, a production device and a production process thereof, and the upper layer membrane, the first middle layer membrane, the inner layer membrane, the second middle layer membrane and the lower layer membrane are sequentially arranged from top to bottom to form the polyethylene geomembrane with a symmetrical five-layer membrane structure taking the inner layer membrane as a center, the components of each layer and the proportion relation among the components are specifically limited, and the puncture resistance and the environmental stress cracking resistance of the polyethylene geomembrane are synchronously improved so as to meet the requirements of severe environment seepage prevention engineering. According to one aspect of the application, the high puncture-resistant polyethylene geomembrane comprises an upper membrane, a first middle membrane, an inner membrane, a second middle membrane and a lower membrane from top to bottom, wherein the upper membrane and the lower membrane comprise 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of double black-resistant master batches, the first middle membrane and the second middle membrane comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin and 2-10 parts of double black-resistant master batches, and the inner membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin and 2-10 parts of double black-resistant master batches. Preferably, the upper layer film and the lower layer film comprise 95 parts of modified linear low-density polyethylene resin and 5 parts of double-black-resistant master batch according to parts by weight, the first middle layer film and the second middle layer film comprise 50 parts of medium-density polyethylene resin, 45 parts of metallocene high-density polyethylene resin and 5 parts of double-black-resistant master batch, and the inner layer film comprises 70 parts of medium-density polyethylene resin, 25 parts of linear low-density polyethylene resin and 5 parts of double-black-resistant master batch. The application comprises an upper layer film, a first middle layer film, an inner layer film, a second middle layer film and a lower layer film from top to bottom, wherein a symmetrical film structure taking the inner layer film as a center is formed, the upper layer film and the lower layer film are subjected to toughening and reinforcing modification and then jointly act with double anti-black master batches, so that the upper layer film and the lower layer film have high stiffness, high tensile strength and high puncture resistance, and excellent flexibility and environmental stress cracking resistance, the first middle layer film and the second middle layer film adopt me