Impermeable coating with heavy metal chelating function as well as composition and application thereof

Abstract

The invention belongs to the technical field of impermeable coatings, and discloses an impermeable coating with a heavy metal chelating function as well as a composition and application thereof. The preparation method comprises the following steps: carrying out a ring-opening reaction on active siloxane, a long-chain alkyl derivatives and a polyamine structure compound with an epoxy ring of poly(glyceryl methacrylate); and introducing a polyether modified siloxane chain Rn, a long-chain alkyl Rf and a polyamine structure Rm into a polymer chain, wherein the molar ratio of a polyepoxy main chain to the polyether modified siloxane chain Rn to the long-chain alkyl Rf to the polyamine chain Rm is (5-50): (1-10): (1-10): (1-10). The impermeable coating has a plurality of heavy metal binding sites and integrates multiple functions such as a heavy metal chelating function, a bonding function, a hydrophobic function and a film forming function. Micro-nano particles in the coating composition are wound and chemically bonded with a polymer film forming matter to form a stable hydrophobic impermeable polymer film, so that the use amount is small, the cost is low, and the heavy metal stabilizing effect is efficient and lasting.

Description

technical field [0001] The invention belongs to the technical field of anti-seepage coating, in particular to an anti-seepage coating with heavy metal chelating function, its composition and application. Background technique [0002] In hazardous waste landfills, industrial waste dumps and other areas where heavy metals accumulate and have high concentrations of heavy metals, impermeable membranes are particularly important, especially when the groundwater level is higher than the disposal site, and the groundwater seeps and flows into the landfill along the pores. On the one hand, it increases sewage Treatment capacity and operating costs, on the other hand, harmful leachate, especially heavy metal ions redissolved, causing groundwater pollution. Therefore, in places such as hazardous waste landfills and industrial waste dumps, anti-seepage membranes are laid on the bottom, sides and even the top to prevent the penetration of harmful leachate. [0003] The current anti-see...

AI Technical Summary

Problems solved by technology

[0003] The current anti-seepage membrane is mostly replaced by geomembrane. This kind of membrane adopts high-density polyethylene single-layer or double-layer anti-seepage membrane technology, which is brittle. During construction and use, cracks will occur due to induced stress, especially when groundwater When the supporting force of the membrane is greater than the water pressure on the membrane, the anti-seepage membrane will bulge and rupture and lose the anti-seepage function

To make matters worse, the stabilized heavy metals in the landfill redissolve and migrate into the groundwater during the long-term erosion and scouring process of rainwater, causing serious consequences of heavy metal pollution in the groundwater

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