Hot-Melt Adhesive Using Recycled Polypropylene
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional adhesives contain petroleum-based waxes and polymers, leading to environmental polymer load and the need for sustainable alternatives that maintain adhesive performance.
Innovation Solution
Development of hot-melt adhesive compositions using recycled, non-virgin polymeric materials, specifically polypropylene, which was previously overlooked due to poor adhesion and wetting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional petroleum-based waxes and polymers are used in adhesives, then adhesive performance is maintained, but environmental polymer load increases
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by replacing petroleum-based polymers with recycled polypropylene and adjusting the ratio of recycled content (5-50 wt%) to achieve both environmental benefits and adequate adhesive performance
Solution Approach 2:
The patent creates a composite adhesive system combining recycled polypropylene with other polymeric materials and additives to achieve the necessary adhesive properties while reducing environmental impact
2Object-affected harmful factors
If non-virgin polypropylene is used as adhesive material, then environmental sustainability is improved, but adhesion properties and wetting behavior deteriorate
Solution Approach 1:
The patent modifies the physical and chemical parameters of recycled polypropylene by controlling viscosity (100-500,000 cP at 190°C) and incorporating it with specific ratios of other polymers and additives to restore adequate adhesion properties
Solution Approach 2:
The patent introduces intermediary substances such as waxes, oils, and coupling agents that mediate between the recycled polypropylene and substrates to improve wetting behavior and adhesion despite the use of non-virgin material
3Stability of the object's composition
If non-virgin polymeric material with high viscosity is used, then material stability is improved, but processing difficulty and application performance worsen
Solution Approach 1:
The patent optimizes the viscosity parameter of the adhesive composition by selecting recycled polypropylene within specific viscosity ranges (100-500,000 cP at 190°C) and adjusting formulation components to achieve balance between stability and processability
Solution Approach 2:
The patent creates a dynamic viscosity profile where the adhesive exhibits appropriate flow characteristics during application (when heated) and stabilizes after application (when cooled), enabling easy processing while maintaining composition stability
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 use of non-virgin polypropylene in hot-melt adhesive compositions offers improved environmental sustainability, accelerated curing times, and enhanced sealing performance, making them a viable alternative to traditional adhesives.
Implementation Method 1
the non-virgin polymeric material has a viscosity of less than about 500,000 centipoise (cps) at a temperature of 190° C.
Implementation Method 2
adhesives are widely used in various industries for bonding different materials together
Data Source
AI summary
The present disclosure provides hot-melt adhesive compositions comprising a non-virgin polymeric material and methods of preparing such hot-melt adhesive compositions.