Hydroxide Modification of Crosslinked Elastomer Bitumen
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Solution Overview
Problem
Bituminous compositions modified with crosslinked elastomers face challenges in achieving optimal elastic properties, particularly in maintaining or improving these properties while reducing the quantity of crosslinked elastomer, which is economically advantageous.
Innovation Solution
Incorporating a hydroxide, such as sodium hydroxide (NaOH) into bituminous compositions containing crosslinked vinyl aromatic hydrocarbon and conjugated diene copolymers, which improves or maintains elastic properties like elastic recovery, deformation energy, and phase angle, even with reduced amounts of crosslinked elastomer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the quantity of crosslinked elastomer is reduced to achieve economic benefits, then the cost decreases, but the elastic properties of the bituminous composition deteriorate
Solution Approach 1:
The patent introduces hydroxide (NaOH or KOH) as a chemical additive to change the chemical parameters of the bituminous composition. This chemical modification enables the system to maintain elastic properties with reduced elastomer content by altering the molecular interactions and crosslinking efficiency within the bitumen matrix.
Solution Approach 2:
The patent creates a composite system by combining crosslinked elastomer, bitumen, and hydroxide additive. This composite approach allows the hydroxide to enhance the functional performance of the elastomer-bitumen system, enabling reduced elastomer dosage while maintaining or improving elastic recovery and deformation energy characteristics.
2Ease of manufacture
If the quantity of crosslinked elastomer is reduced, then the manufacturing cost decreases, but the elastic recovery and deformation energy are compromised
Solution Approach 1:
The addition of hydroxide modifies the chemical and rheological parameters of the bituminous composition, creating a synergistic effect that enhances elastic recovery and deformation energy. This parameter change allows cost reduction through lower elastomer content while maintaining mechanical performance.
Solution Approach 2:
The hydroxide acts as an intermediary substance that mediates between the crosslinked elastomer and bitumen matrix. It facilitates improved interfacial interactions and crosslinking efficiency, enabling the system to achieve desired elastic properties with reduced elastomer concentration.
3Reliability
If hydroxide is added to improve elastic properties, then the elastic recovery and deformation energy increase, but the composition complexity increases
Solution Approach 1:
The patent employs a simple parameter change approach by adding a single chemical additive (hydroxide) to modify the system's elastic properties. This straightforward compositional adjustment avoids complex processing equipment or multi-step procedures, maintaining manufacturing simplicity while achieving enhanced performance.
Data Source
Figure 1~2
AI summary
The invention concerns the use of a hydroxide XOH with X = Na or K, in a bituminous composition comprising bitumen modified by a crosslinked elastomer which is a crosslinked vinyl aromatic hydrocarbon and conjugated diene copolymer, having a vinyl aromatic hydrocarbon content representing less than 30% by weight of the weight of the crosslinked elastomer, for improving the effect of the crosslinked elastomer on the elastic properties of the bituminous composition.