Flexible Gastight Material for Landfill Odor Sealing
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Solution Overview
Problem
Current methods for managing landfill odors, such as deodorant spraying, provide only short-term relief and fail to effectively address the long-term environmental pollution caused by toxic gases emitted from landfill sites, impacting both health and carbon emission goals.
Innovation Solution
A flexible gastight material composed of specific polyols, diisocyanates, and catalysts, which forms a micro-closed-cell foam structure when applied, effectively sealing off toxic odors and combining with gas treatment systems to provide long-lasting gas sealing and water-blocking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If deodorant spraying is used to treat landfill odor, then odor dispersion is curtailed to a certain extent, but the deodorant has short duration and cannot meet long-term deodorization requirements
Solution Approach 1:
The patent changes the chemical parameters of the sealing material by using specific polyols (molecular weight 300-500, 1000-1500) combined with diisocyanates and catalysts to create a foam structure that provides long-lasting gas sealing, transforming the temporary deodorization effect into a sustained barrier that prevents gas emission over extended periods
Solution Approach 2:
The patent employs a composite material system consisting of multiple components: polyols with specific molecular weights, diisocyanates (2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, or hexamethylene diisocyanate), and catalysts (dibutyltin dilaurate or bismuth carboxylate) to create a foam structure with superior long-term sealing performance
2Ease of manufacture
If landfill garbage is disposed of without treatment, then treatment cost is reduced, but toxic and harmful gases are emitted causing environmental pollution and health impacts
Solution Approach 1:
The patent extracts and seals the harmful gases (methane, carbon dioxide, hydrogen sulfide, ammonia, and other toxic substances) generated during garbage decay by applying the flexible gastight material as a barrier layer, preventing these gases from escaping into the environment while allowing the landfilling process to continue
Solution Approach 2:
The flexible gastight material acts as an intermediary barrier between the decomposing garbage and the external environment, using its foam structure with closed cells to block gas transmission while maintaining flexibility and adaptability to the landfill site conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The flexible gastight material achieves excellent gas sealing and odor blocking, reducing environmental pollution and carbon emissions, with a simple construction process and long-lasting effect, offering significant social and environmental benefits.
Implementation Method 1
forms a micro-closed-cell foam structure when applied
Implementation Method 2
component A includes: (1) at least one of polypropylene glycol with a molecular weight of 600-4000, polytetrahydrofuran diol with a molecular weight of 1000-3000, polycaprolactone diol with a molecular weight of 1000-3000, and polycarbonate diol with a molecular weight of 1000-3000; and (2) at least one of 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate
Implementation Method 3
a catalyst, being one of dibutyltin dilaurate and bismuth carboxylate
Implementation Method 4
The closed-cell elastic structure of the flexible gastight material may block the volatilization of toxic and harmful odors and may cut off the diffusion path of the odors
Data Source
AI summary
A flexible gastight material for a landfill site includes a component A and a component B, the component A including: at least one of polypropylene glycol with a molecular weight of 600-4000, polytetrahydrofuran diol with a molecular weight of 1000-3000, polycaprolactone diol with a molecular weight of 1000-3000, and polycarbonate diol with a molecular weight of 1000-3000; and at least one of 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate. The flexible gastight material for the landfill site provided in the present application has a micro-closed-cell foam structure. The closed-cell elastic structure of the flexible gastight material may block the volatilization of toxic and harmful odors, and may cut off the diffusion path of the odors by combining with gas treatment systems at the landfill site. The flexible gastight material has excellent water blocking and gas sealing performance.