Adhesive Compound High Temperature Stability
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Solution Overview
Problem
Existing anti-corrosive coatings for pipes and manhole covers face issues with high temperature performance, as they become runny and ineffective at elevated temperatures, and are often too expensive for less demanding applications, while also requiring improved humidity and gas barrier properties.
Innovation Solution
An adhesive compound comprising an organic phase with an amorphous aliphatic propene-based polymer and a second aliphatic material, combined with an inorganic filler phase, providing improved high temperature characteristics, adhesion, and low permeability to water and gases, suitable for use as a pressure-sensitive adhesive and anti-corrosive coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyisobutene based anti-corrosive coatings are used, then good anti-corrosive properties and adhesion are achieved, but the coating becomes runny and ineffective at high temperatures
Solution Approach 1:
The patent changes the polymer parameters by using polypropylene with specific molecular weight (10,000-100,000) and comonomer content (5-20 mol%), and by controlling the R&B softening point (75-180°C) to achieve optimal high temperature stability while maintaining anti-corrosive properties
Solution Approach 2:
The invention creates a composite adhesive compound combining polypropylene-based polymer with inorganic fillers (such as calcium carbonate, talc, or silica) and optional rubber compounds, where the composite structure provides both adhesion and high temperature resistance
2Reliability
If polyisobutene coatings are used for demanding anti-corrosive applications, then excellent protection is achieved, but the cost becomes too high for less demanding applications
Solution Approach 1:
The patent replaces expensive polyisobutene with more economical polypropylene-based polymers that can be produced at lower cost while still providing sufficient anti-corrosive protection for various applications, making the coating economically viable for both demanding and less demanding uses
3Temperature
If the adhesive compound uses amorphous propene-based polymer with higher softening point, then high temperature flow resistance is improved, but adhesion and tackiness may be reduced
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: polymer molecular weight (10,000-100,000), comonomer content (5-20 mol%), and R&B softening point (75-180°C) to achieve the right balance between high temperature flow resistance and adhesion strength
Solution Approach 2:
The invention incorporates inorganic fillers and optional rubber compounds (5-50 phr) into the polypropylene-based adhesive to enhance both high temperature stability and adhesion properties, creating a composite material that overcomes the limitations of pure polymer systems
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 compound exhibits enhanced tackiness, cohesive failure, and high temperature stability, preventing fluidity up to 100°C, and effectively prevents water droplet formation and anaerobic bacteria growth, making it suitable for various corrosive applications with improved cost-effectiveness.
Implementation Method 1
an amorphous aliphatic propene based (co)polymer with 30wt% or more polymerized propene units and having a Ring & Ball softening point of between 75 and 180 °C
Implementation Method 2
a second aliphatic material having a Tg of -5 °C or lower and a kinematic viscosity of 4500 mm²/s or lower at 100 °C
Implementation Method 3
The compound has very low permeability for water or gas. Hence, the compound precludes water to form droplets on a metal surface, nor does it allow anaerobic bacteria to grow.
Data Source
AI summary
The present invention relates to an adhesive compound consisting essentially of an organic phase and inorganic phase, the organic phase comprising an amorphous aliphatic (co)polymer having a Ring & Ball softening point of between 75 and 180 °C, and a second aliphatic material having a Tg of about -5 °C or lower and a kinematic viscosity of 4500 mm2/s at 100 °C or less, wherein said organic components are present in weight amounts of between 95/5 and 10/90; the inorganic phase comprising a filler, the filler being present in amount of at least about 15 wt% in the total composition. The compositions are suitable for anti-corrosion coatings or sealants against filtration or penetration of water or moisture. A rubber material may be added to this compound or other anti-corrosion coatings to increase the yield point at high temperatures.