Biocidal Pipe Wrapping Material for Anaerobic Corrosion Protection
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Solution Overview
Problem
Buried metal pipes suffer from corrosive degradation due to anaerobic bacteria in soil, leading to sudden failures and significant economic losses, as current protective methods are inadequate in addressing microbiologically influenced corrosion.
Innovation Solution
A thermoplastic blend-based pipe-wrapping material incorporating a biocide like zinc pyrithione, which provides a physical barrier and self-healing properties, effectively inhibiting the growth of anaerobic bacteria such as sulfate-reducing bacteria, thereby reducing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protective coatings are applied to buried pipes, then physical barrier protection is provided, but protection against microbiologically influenced corrosion is insufficient
Solution Approach 1:
The patent combines a thermoplastic blend (providing physical barrier protection) with a biocide (providing chemical protection against microorganisms) into a single integrated wrapping material. This merging of physical and chemical protection mechanisms resolves the contradiction by simultaneously addressing both barrier protection and microbiologically influenced corrosion prevention.
Solution Approach 2:
The wrapping material is formulated as a composite consisting of a thermoplastic blend (including polymers such as polyethylene, polypropylene, and elastomers) combined with biocidal agents (such as zinc pyrithione, copper compounds, or organic biocides). This composite structure enables the material to provide both mechanical barrier properties and antimicrobial activity, thereby resolving the insufficiency of traditional single-function coatings.
2Duration of action of stationary object
If pipes are buried in soil for long periods, then service life is extended, but corrosion from anaerobic bacteria increases over time
Solution Approach 1:
The biocidal wrapping material is applied to the pipe surface before burial, establishing a protective barrier that prevents anaerobic bacteria from colonizing the pipe surface. This preliminary action of pre-treating the pipe with biocidal protection eliminates the need for ongoing maintenance and ensures long-term protection throughout the extended service life of the buried pipe.
Solution Approach 2:
The wrapping material provides continuous protection by maintaining both its physical barrier integrity and biocidal activity over extended periods. The thermoplastic blend ensures continuous physical coverage while the biocide continuously inhibits microbial growth, thereby maintaining protective action throughout the entire service life of the buried pipe system.
3Reliability
If inspection and maintenance are performed on buried pipes, then corrosion damage can be detected, but access to buried pipes is difficult
Solution Approach 1:
The biocidal wrapping material is applied as a preventive measure before pipes are buried, eliminating the need for frequent inspections and maintenance. This preliminary protective action prevents corrosion damage from occurring in the first place, thereby removing the operational difficulty of accessing buried pipes for inspection and maintenance while ensuring reliable protection.
4Strength
If conventional protective methods are used, then initial protection is provided, but protection deteriorates due to damage to coatings over time
Solution Approach 1:
The composite wrapping material combines a durable thermoplastic blend with embedded biocidal agents, creating a protective system where the thermoplastic matrix maintains physical integrity while the biocide provides ongoing chemical protection. This composite structure prevents the deterioration issues seen in conventional coatings by integrating multiple protective mechanisms that support each other over time.
Solution Approach 2:
The biocidal wrapping material provides self-service protection by actively inhibiting microbial growth that could otherwise degrade the protective barrier. The biocide continuously performs the function of preventing biological deterioration, eliminating the need for external maintenance or repair of the protective coating throughout its service life.
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 pipe-wrapping material significantly reduces microbial load and prevents bacterial-induced corrosion, extending the service life of metal pipes by providing both physical and chemical protection against corrosive soil environments.
Implementation Method 1
incorporating a biocide like zinc pyrithione, which provides a physical barrier and self-healing properties, effectively inhibiting the growth of anaerobic bacteria
Implementation Method 2
A thermoplastic blend-based pipe-wrapping material incorporating a biocide like zinc pyrithione, which provides a physical barrier and self-healing properties
Implementation Method 3
provides a physical barrier and self-healing properties, effectively inhibiting the growth of anaerobic bacteria
Data Source
AI summary
A pipe-wrapping material or compound, comprising a thermoplastic blend, wherein the thermoplastic blend includes at least one isobutylene-isoprene copolymer; at least one multi-arm polymer based on ethylene/propylene; at least one ethylene copolymer; and at least one polybutene polymer; at least one filler; at least paraffinic oil; and at least one biocide, wherein the at least one biocide is formulated to be effective against anaerobic bacteria, and wherein the anaerobic bacteria include sulfate-reducing bacteria.