Bitumen-Polymer Compositions Using Phosphoric Esters
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Solution Overview
Problem
Bitumen-polymer compositions used in waterproofing and insulation applications face challenges with 'hot' viscosity and deformability, requiring improved resistance to high temperatures and elasticity, while maintaining stability at 'cold' temperatures, and lack physico-chemical stability during storage.
Innovation Solution
Incorporating a phosphoric or thiophosphoric ester to broaden the plasticity range of anhydrous bitumen-polymer compositions, increasing the ball-ring temperature and reducing the cold bendability temperature, thereby enhancing 'hot' viscosity and 'cold' resistance, and ensuring storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bitumen-polymer compositions are used for waterproofing applications, then the coating provides waterproofing and insulation properties, but the composition exhibits insufficient resistance to high temperatures and poor deformability under load
Solution Approach 1:
The patent modifies the chemical composition parameters of the bitumen-polymer system by introducing specific polymer types and ratios, along with additives, to change the thermal behavior parameters (ball-ring temperature and deformability under load) without fundamentally altering the application method or basic composition structure
Solution Approach 2:
The patent creates a composite bitumen-polymer-modifier system combining bitumen with specific polymers (SBS, SBR, EPDM) and chemical modifiers to achieve superior thermal resistance and deformability properties that neither component could provide alone
2Ease of operation
If the bitumen-polymer composition is softened for application, then the coating can be spread and adhered to surfaces, but the composition becomes excessively soft and deformable under installation conditions
Solution Approach 1:
The patent adjusts the rheological parameters of the bitumen-polymer composition through polymer selection and additive optimization to achieve a specific temperature-viscosity-deformability relationship that allows easy application at installation temperature while maintaining shape stability under load
3Reliability
If the composition is made more rigid to resist deformation, then the coating gains resistance to high temperature deformability, but the composition becomes difficult to spread and apply
Solution Approach 1:
The patent creates a composition with dynamic rheological properties that adapt to temperature and stress conditions - flexible and spreadable during warm installation, then rigid and stable during service - through polymer selection that provides temperature-dependent viscoelastic behavior
4Reliability
If polymer additive quantity is increased to improve elastic recovery, then the coating gains better cold temperature performance, but the cost and complexity of the composition increases
Solution Approach 1:
The patent optimizes the polymer concentration parameter to achieve maximum elastic recovery efficiency at minimal dosage, and selects polymer types (SBS, SBR, EPDM) with high elastic recovery capability to reduce the required quantity while maintaining or improving performance
Data Source
AI summary
The invention relates to the use of at least one phosphoric or thiophosphoric ester in order to broaden the plasticity range of an anhydrous bitumen/polymer composition of the type comprising at least one bitumen, optionally at least one filler and at least one crosslinkable or non-crosslinkable polymer, preferably a bituminous mastic. Said use enables the absolute value of the lower limit (cold flexibility temperature) and/or the upper limit (ball-ring temperature) of the plasticity range of the composition to be increased. The aim of the invention is to provide a bitumen/polymer composition having a good performance when hot (increase in ball-ring softening temperature) and when cold (reduction in flexibility temperature), along with good storage stability.