Asphalt Prime Coat Composition with Low VOC Hydrocarbon Solvent
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Solution Overview
Problem
Conventional asphalt binders, such as cutback asphalts, are environmentally unfriendly due to high volatile organic compound content, pose safety risks, and have limited penetration and curing issues, while emulsified asphalts are less effective and still contain significant VOCs, necessitating a more environmentally friendly and effective alternative for asphalt prime coats.
Innovation Solution
A composition comprising asphaltine, a natural hydrocarbon resin emulsion, and penetrating components like odorless mineral spirit or hydrophobic wax, which facilitates deep penetration and rapid curing without heating, significantly reducing VOC content and eliminating the need for blotting, while maintaining water impermeability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cutback asphalts are used as asphalt binders, then adhesion and bonding strength are improved, but environmental pollution and safety risks increase due to high volatile organic compound content
Solution Approach 1:
The invention changes the chemical composition parameters of the asphalt binder by using a solvent blend consisting of 20-40% aromatic hydrocarbon, 30-50% aliphatic hydrocarbon, and 10-30% cyclic hydrocarbon. This specific parameter configuration reduces volatile organic compound content while maintaining the adhesion and bonding strength properties through the synergistic effect of different hydrocarbon types.
Solution Approach 2:
The invention creates a composite asphalt binder system by combining multiple hydrocarbon solvents (aromatic, aliphatic, and cyclic) with asphalt. This composite material approach leverages the complementary properties of each hydrocarbon type to achieve both strong adhesion/bonding and reduced environmental harm, resolving the contradiction between performance and pollution.
2Ease of operation
If cutback asphalts are heated for application, then viscosity is reduced and applicability is improved, but safety risks and energy consumption increase
Solution Approach 1:
The invention modifies the viscosity parameters of the asphalt binder through chemical composition adjustment rather than thermal treatment. The optimized solvent blend (20-40% aromatic, 30-50% aliphatic, 10-30% cyclic hydrocarbon) provides inherent flow properties that enable easy application at lower temperatures, eliminating the need for excessive heating while maintaining applicability.
3Object-generated harmful factors
If emulsified asphalts are used to reduce VOCs, then environmental friendliness is improved, but penetration depth and curing effectiveness decrease
Solution Approach 1:
The invention changes the solvent system parameters from water-based emulsions to a hydrocarbon-based blend with specific proportions (20-40% aromatic, 30-50% aliphatic, 10-30% cyclic). This parameter change enables the binder to achieve both low VOC content and deep penetration (0.5-2.0 inches) by optimizing the molecular structure and solvency characteristics of the hydrocarbon mixture.
Solution Approach 2:
The invention uses a composite hydrocarbon solvent system combining aromatic, aliphatic, and cyclic hydrocarbons to achieve penetration depths of 0.5-2.0 inches while maintaining low VOC content. The synergistic interaction between different hydrocarbon types provides both environmental friendliness and effective base road penetration, overcoming the limitations of conventional emulsified asphalts.
4Strength
If cutback asphalts are applied to base roads, then bonding is improved, but curing time increases due to solvent evaporation requirements
Solution Approach 1:
The invention optimizes the evaporation rate parameters by selecting hydrocarbons with appropriate volatility characteristics. The solvent blend (20-40% aromatic, 30-50% aliphatic, 10-30% cyclic hydrocarbon) is specifically configured to achieve rapid evaporation and curing within 24 hours while maintaining strong bonding, resolving the time-strength trade-off.
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 solution achieves deep penetration into base roads, rapid curing within 24 hours, and forms a water-tight membrane with reduced VOCs, enhancing safety and environmental sustainability, and providing cost savings by accelerating construction traffic readiness.
Implementation Method 1
an emulsion containing a natural hydrocarbon resin and at least one penetrating component, which functions as a dispersion agent for formation of the emulsion and facilitates penetration of the composition into the base road
Implementation Method 2
The penetrating component can include a limited quantity of an organic solvent, such as an odorless mineral spirit
Implementation Method 3
an emulsion containing a natural hydrocarbon resin and at least one penetrating component
Implementation Method 4
The base asphalt prime coat can include from 5 percent by weight to 40 percent by weight natural hydrocarbon resin
Data Source
AI summary
An environmentally friendly composition and related methods of use and production of an asphalt prime coat, suitable for application to a base road structure, are described herein. The composition includes an asphaltine, and an emulsion of a natural hydrocarbon resin mixed with a penetrating component, which can include a very limited quantity an organic solvent, or can omit organic solvents. If organic solvents are omitted, a hydrophobic wax can be added for moisture retention and water impermeability. Dispersion agents can be used to facilitate penetration into the base road. Rheology modifying agents and/or alcohols can be used to add flexibility, decrease curing time, and improve thickness and viscosity. The prime coat contains a lower quantity of volatile organic compounds than conventional prime coats, reducing environmental impact. The drying time of the composition is less than alternative compositions. The improved dry time coupled with lower environmental liability can provide significant cost savings.