Definition of geomembrane: The so-called geomembrane is a kind of geomembrane with extremely low water permeability, which is used in civil engineering. Classification of geomembrane: Geomembrane is generally divided into asphalt geomembrane and polymer (synthetic polymer) geomembrane. In order to meet the different strength and deformation requirements in various civil engineering applications, the two types evolved into reinforced and unreinforced (single or mixed materials) combined types respectively. 1. At present, composite asphalt (including woven or nonwoven geotextile) is mainly used as wetting binder for asphalt geomembrane. 2. Polymer geomembrane can be divided into plastic geomembrane according to different main materials. Elastic geomembrane and composite geomembrane (composite geomembrane) The main materials of plastic geomembrane are: polyvinyl chloride (PVC), durable polyvinyl chloride (PVC-OR), toughened polyvinyl chloride (PVC-E), chlorinated polyethylene (CPE), low density polyethylene (LDPE), medium density polyethylene (MDPE) and high density polyethylene (HDPE). The main materials of toughened polyolefin or elastic polyolefin (ELPO) elastic geomembrane are rubber: butyl rubber (IIR), propylene oxide rubber (ECO), chloroprene rubber (CR), nitrile rubber (NBR) and chlorohydrin rubber. The manufacturing processes of combined geomembrane, such as EPDM, PVC-NBR, and the combination of membrane and geotextile (composite geomembrane made of plastic film and non-woven fabric), can be divided into blow molding, calendering and scraping. The general characteristics of geomembrane include physical properties, mechanical properties, chemical properties, thermal properties and durability. Geomembrane pays more attention to its waterproof (impervious) performance, deformation resistance and durability in engineering application. A large number of engineering practices have proved that geomembrane has good impermeability; Good elastic strain ability, able to withstand different construction conditions and working pressures; It has good aging resistance, especially the durability of geomembrane under water and soil. At present, HDPE geomembrane is the most widely used. The performance characteristics of HDPE geomembrane are as follows: 1. HDPE geomembrane is a kind of flexible waterproof material, which has a very high impervious coefficient (/kloc-0 /×10-17 cm/s). 2.HDPE geomembrane has good heat resistance and cold resistance, and its ambient temperature is 165438+. Low temperature -70℃ 3. HDPE geomembrane has good chemical stability and can resist the corrosion of strong acid, strong alkali and oil. 4.HDPE geomembrane has high tensile strength, which makes it have high tensile strength to meet the needs of high-standard engineering projects. 5.HDPE geomembrane has strong weather resistance and aging resistance. Can be used naked for a long time, maintaining the original performance. 6.HDPE geomembrane adopts three layers of independent feeders, and different ingredients in each layer can have unique properties, which improves the engineering performance of HDPE geomembrane. 7. The comprehensive performance of HDPE geomembrane has strong tensile strength and elongation at break, which enables HDPE geomembrane to be used in various harsh geological and climatic conditions. Strong adaptability to uneven geological settlement. 8.HDPE geomembrane is made of high-quality primary plastics and carbon black particles, and does not contain any preservatives. In China, HDPE has replaced PVC as the raw material for food packaging bags and plastic wrap. The HDPE geomembrane produced by our company is non-toxic, with good engineering performance and wide application range. The application fields of HDPE geomembrane are as follows: 1, environmental protection, sanitation (domestic waste landfill seepage control and leachate collection isolation filtration system, sewage treatment tank seepage control and soft foundation reinforcement, power plant regulation tank seepage control, industrial sewage tank seepage control, chemical sewage tank seepage control, hospital hazardous solid waste landfill seepage control and geotechnical reinforcement, artificial wetland seepage control, seepage control membrane, sewage purification treatment system isolation filtration, etc. ) 2. Geotextiles for water conservancy projects (artificial lake seepage prevention) are used for dam foundation reinforcement, drainage by drainage plates, drainage and pressure reduction. (3) Municipal construction projects (drainage filtration of drainage plate tunnel, drainage decompression of underground construction projects, basement seepage control of waterproof blanket and bentonite waterproof blanket and artificial river seepage control, roof seepage control of HDPE geomembrane planting, subway tunnel seepage control, roof garden seepage control and plant root puncture prevention, seepage control and moisture prevention of high-grade factories and warehouses, and anti-corrosion lining of sewage pipes; External water diversion, decompression and drainage, soft soil foundation reinforcement and drainage and other seepage control projects) 4. Landscape and greening projects (artificial lake seepage control, artificial lake revetment foundation reinforcement, water vapor introduction, artificial wetland seepage control, river seepage control, slope stability, dam reinforcement, reservoir seepage control, golf course artificial lake seepage control, depression greening transformation, saline-alkali land and gravel land greening planting layer transformation, mountain slope protection reinforcement, green lawn waterproof and moisture-proof, etc.). ) 5. Petrochemical system (chemical sewage tank seepage control, refinery sewage tank seepage control, oil tank foundation seepage control, gas station oil tank seepage control and refinery oil pollution tank seepage control, chemical reaction tank seepage control, sedimentation seepage control, tank printing and dyeing sewage tank seepage control and isolation, electroplating pickling tank seepage control and corrosion control, pipeline lining, etc.). 6. Anti-seepage of mining industry (ore washing pond, heap leaching pond, ash yard, ore dissolving pond, sedimentation pond, tailings storage yard, sewage storage pond, etc.). 7. Road traffic facilities (geogrid highway foundation reinforcement, geocell slope protection, drainage board and underground water diversion and decompression on the back of geotextile slope lining wall, rainwater drainage of drainage board expressway and system for preventing water from floating between tire and ground, railway subgrade reinforcement, anti-seepage and diversion reinforcement under ballast, anti-seepage of culvert and tunnel, underground water drainage and moistureproof of lines) 8. Agriculture (leakage control of reservoirs, drinking pools, water diversion and irrigation systems) 9. Food processing industry (anti-seepage in starch slurry pond, orange pond in sugar factory, alcohol wastewater pond and food wastewater treatment pond) 10, animal husbandry (anti-seepage in aquaculture wastewater pond and water diversion irrigation system). Anti-seepage of oxidation pond,) 1 1, traffic facilities (moistureproof and reinforcement of frozen soil foundation of highway, anti-seepage and drainage of pavement, anti-seepage of drainage ditch, anti-seepage of tunnel engineering) 12, salt industry (anti-seepage of crystallization pond in saltworks, salt film drying, anti-seepage of brine pond, salt film drying and salt stack cover).
Geomembrane manufacturer Zhang Mingchao