Prehydration-type geosynthetic clay liner and preparation method thereof

A bentonite waterproof blanket and pre-hydration technology, applied in chemical instruments and methods, lamination devices, lamination auxiliary operations, etc., can solve the problems of poor anti-pollution effect, decreased anti-seepage effect, and long time required. Achieve the effect of increasing construction difficulty, facilitating promotion and low production cost

Active Publication Date: 2015-05-20
中国非金属矿工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN202359627U discloses a waterproof blanket, which includes a waterproof blanket body and a protective layer arranged on the waterproof blanket body. When it is used in the field and other environments, the anti-seepage effect will be reduced or even invalid.
[0005] CN101514559A discloses "an anti-pollution sodium-based bentonite waterproof blanket and its manufacturing method", which plays an anti-pollution effect by mixing sodium-based bentonite with cationic polyacrylamide powder and anionic polyacrylamide powder, but due to It takes a long time for anion and cation polyacrylamide to expand. In the presence of sewage, bentonite and anion and cation polyacrylamide cannot fully expand, so their anti-pollution effect becomes poor.

Method used

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  • Prehydration-type geosynthetic clay liner and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ① The natural sodium-based bentonite raw ore is dried and crushed and passed through a 50-mesh sieve to make bentonite powder with an expansion index ≥ 24ml / 2g, a filtration loss of 12ml, and a water content of 10%;

[0031] ② Fully mix 8 parts of bentonite powder, 1 part of sodium polyacrylate, and 0.67 parts of sodium hydroxide, and send the mixture to the continuous stirring reactor through the feeder at a uniform speed, and spray 5 parts of water evenly on the surface of the mixture while conveying, Water is industrial water with a total cationic content of ≤300mg / l. Under the action of a high-speed, high-shear stirring gear, the mixture is stirred and sheared into a uniform mass with toughness. The speed is 90r / min, and the reaction time is 8min. .

[0032] ③Convey the uniform agglomerate to the vacuum screw extruder, vacuumize under the pressure of 2Mpa to remove excess air and moisture in the agglomerate, and increase the product density; Pushed into the annular...

Embodiment 2

[0035] ①The natural sodium-based bentonite raw ore is dried and crushed and passed through a 100-mesh sieve to make bentonite powder with an expansion index ≥ 24ml / 2g, a filtration loss of 18ml, and a water content of 15%;

[0036] ② Fully mix 10 parts of bentonite powder, 1 part of corn starch, and 0.83 parts of sodium carboxymethyl cellulose, and send the mixture to the continuous stirring reactor through the feeder at a uniform speed, and spray 6 parts of water evenly on the mixture while conveying On the surface, the water is tap water with a total cation content of ≤300mg / l. Under the action of a high-speed, high-shear stirring gear, the mixture is stirred and sheared into a uniform mass with toughness. The speed is 90r / min, and the reaction time is 12min.

[0037] ③Convey the uniform agglomerate to the vacuum screw extruder, vacuumize to remove excess air and moisture in the agglomerate, and increase the product density; the agglomerate after vacuuming is continuously pu...

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Abstract

The invention discloses a prehydration-type geosynthetic clay liner and a preparation method thereof. The clay liner consists of shell fabrics, prehydration-type bentonite and base cloth. The preparation method comprises the steps of: mixing natural sodium bentonite, natural high-polymer materials and water so as to prepare prehydration-type bentonite thin sheets, and coating non-woven cloth and knitted cloth on the upper surfaces and the lower surfaces of the prehydration-type bentonite thin sheets. The prehydration-type geosynthetic clay liner provided by the invention is 4.5-5.5kg / m<2> in mass area ratio, 0.55-0.65cm in thickness, and 1m-6m in amplitude, is especially suitable for being applied to seepage-prevention construction of underground engineering of buildings, subways and the like, the seepage prevention of pools, lakes and reservoirs, and the seepage prevention construction of percolate quality at the construction environments of seawater, or refuse landfills and the like under complex conditions, and also can be used as a material for flat or gradient roof surfaces or roofs.

Description

technical field [0001] The invention relates to a waterproof material and a preparation method thereof, in particular to a prehydration type bentonite waterproof blanket and a preparation method thereof. Background technique [0002] In recent years, the bentonite waterproof blanket produced with bentonite as the main raw material has become an important waterproof and anti-seepage material. Because montmorillonite, the main mineral in bentonite, has good physical and chemical properties such as swelling, water absorption, cohesiveness, and ion exchange, it can absorb water dozens of times its own weight when it encounters water, and its volume can increase after absorbing water. Tens of times, during the construction process, the pressure of the upper covering will limit it in a limited space to form a dense gel, which can block water penetration, and its permeability coefficient can usually be as low as 10 -9 cm / s. [0003] At present, bentonite waterproof blanket mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B37/10B32B38/00
Inventor 刘玉芹舒锋王志强李根旭刘枫邓桦
Owner 中国非金属矿工业有限公司
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