Aliphatic Cyclic Amine Pipeline Coating for Bend Adaptability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Trenchless methods for structural renovation of drinking water pipelines face challenges with multiple bends and require disconnecting lateral connection pipes, and existing coatings lack durability and flexibility.
Innovation Solution
A two-part coating composition comprising aliphatic polyisocyanates and aliphatic cyclic secondary amines, applied in a single pass to form a rapid-setting, impervious lining with inorganic particulate filler, suitable for drinking water contact, and free of aromatic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If trenchless methods (pipe in pipe, pipe bursting, polyethylene thin wall lining) are used for pipeline renovation, then the renovation can be performed without excavating the ground, but these methods cannot handle multiple bends in pipelines and require disconnecting lateral connection pipes
Solution Approach 1:
The patent uses a slurry mixture (fluid suspension of coating composition and inert filler) that can be pumped through the pipeline using hydraulic methods. This allows the coating to be applied through existing pipeline infrastructure without requiring physical access or disconnection of lateral pipes, and the fluid nature allows it to navigate multiple bends effectively
2Productivity
If existing two-part coating systems (polyisocyanate + aromatic polyamine or aspartic acid ester) are used, then rapid setting and impervious coating can be achieved, but the coatings lack durability and flexibility
Solution Approach 1:
The patent changes the chemical parameters of the amine component by using aliphatic cyclic secondary amines instead of aromatic polyamines or aspartic acid esters. This substitution maintains the rapid curing capability while significantly improving the durability and flexibility of the cured coating, as evidenced by the extended service life claim of 50+ years versus typical 10-15 year lifetimes of other methods
Solution Approach 2:
The patent creates a composite coating system combining polyisocyanate with aliphatic cyclic secondary amine, producing a cured coating with enhanced properties. The composite structure provides both the rapid setting characteristic of polyisocyanate-amine reactions and the superior durability and flexibility needed for long-term pipeline service
3Volume of moving object
If coating is applied to form a thick lining (caliper ≥ 5 mm) in a single pass, then sufficient coating thickness can be achieved, but the coating must maintain flexibility and continuity despite the thickness
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating system by using aliphatic cyclic secondary amines, which provide the cured coating with enhanced flexibility and elongation properties. This allows the coating to maintain continuity and flexibility even when applied at thicknesses of 5 mm or greater in a single pass, preventing cracking and maintaining the water-tight barrier
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 coating provides a durable, flexible, and moisture-insensitive lining that can be applied in situ, addressing the challenges of pipeline renovation by forming a continuous, water-tight barrier suitable for drinking water contact and compliance with regulatory standards.
Implementation Method 1
a two-part coating composition comprising an aliphatic polyisocyanate and an aliphatic cyclic secondary amine
Data Source
AI summary
Two-part coating compositions are described comprising an aliphatic cyclic secondary amine and methods of coating surfaces of a (e.g. drinking water) pipeline.