Epoxy Thermoplastic Pellets for Road Adhesion
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Solution Overview
Problem
The existing methods for achieving a strong bond between a bitumen-based base layer and the subsurface in road construction are time-consuming, labor-intensive, and costly, particularly under adverse weather conditions, and require lengthy waiting times between application steps, making them inefficient and expensive, especially in urgent repairs like those on motorways.
Innovation Solution
Applying pellets made of an adhesive composition containing epoxy solid resin and thermoplastic polymer directly onto a non-sticky substrate surface before asphalt application, which melts and forms a strong bond with the asphalt and subsurface, eliminating the need for additional surface treatments and waiting times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bitumen emulsion is applied as a bonding layer, then adhesion between substrate and base layer is improved, but application time and waiting time increase significantly
Solution Approach 1:
The invention changes the physical and chemical parameters of the bonding agent by using epoxy solid resin with specific glass transition temperature (>1.5) and thermoplastic polymer with specific softening point (50-150°C), allowing the material to remain solid at room temperature but melt and bond effectively when heated by hot asphalt, thus achieving strong adhesion without requiring emulsion-forming waiting periods
Solution Approach 2:
The invention uses a composite material system consisting of epoxy solid resin combined with thermoplastic polymer (such as polyethylene, polypropylene, or EVA copolymers), where the epoxy provides strong adhesive bonding and the thermoplastic polymer provides melt-flow characteristics that enable immediate bonding with hot asphalt, eliminating the need for time-consuming emulsion application
2Strength
If additional surface treatments are applied, then bonding quality is improved, but process complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the need for separate primer layers, bitumen emulsion applications, and extended waiting periods from the traditional multi-step bonding process, consolidating all bonding functionality into a single pellet application step that combines adhesive properties and heat-activated bonding in one material
Solution Approach 2:
The adhesive composition pellets serve multiple functions simultaneously: they act as the bonding agent, the heat-activated adhesive, and the bonding layer itself, eliminating the need for separate primer and emulsion applications, thus simplifying the entire surface treatment process while maintaining or improving bonding quality
3Strength
If traditional bonding methods are used, then adhesion is achieved, but production cost and time consumption increase
Solution Approach 1:
The adhesive composition is prepared in advance as solid pellets containing pre-formulated epoxy resin and thermoplastic polymer in specific ratios, allowing immediate application and activation upon contact with hot asphalt without requiring on-site mixing, emulsion preparation, or extended curing等待 times, thus dramatically increasing work speed
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
This method simplifies and speeds up the bonding process, reduces costs, and allows for immediate asphalt coating, providing a strong and durable adhesive bond suitable for urgent repairs without the need for primer layers or bitumen emulsions, even in adverse weather.
Implementation Method 1
the pellets being melted by the asphalt temperature and thereby form excellent adhesion to the asphalt and the subsurface
Implementation Method 2
The adhesion between the substrate and the bitumen-based base layer is a very difficult problem to solve due to the materials involved
Data Source
Figure 1
AI summary
The present invention relates to a method for producing a pavement structure comprising the steps of: applying pellets of an adhesive composition to a non-stick surface of a substrate comprising a support structure, wherein the adhesive composition contains at least one epoxy resin and at least one thermoplastic polymer that is solid at room temperature; and applying a bitumen-based base course. The method enables the rapid and efficient production of a pavement structure with good adhesion between the substrate and the asphalt and is particularly suitable for the rehabilitation of asphalt pavements that must be carried out under time constraints. The application of primer layers is not required.