Tackifier-Free Biodegradable Hot Melt Adhesive Composition
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Solution Overview
Problem
Conventional hot melt adhesives (HMAs) are not biodegradable, leading to environmental harm and are reliant on petrochemical-based components, which are not environmentally friendly.
Innovation Solution
A biodegradable hot melt adhesive is composed of a copolymer comprising a repeating unit of formula (Ia) and a repeating unit of formula (Ib) and polyvinyl alcohol (PVA), which eliminates the need for a separate tackifier, providing favorable adhesion, biodegradability, and properties such as setting time, open time, and softening point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional hot melt adhesives are used, then favorable adhesion and setting properties are achieved, but biodegradability is poor and environmental harm occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using biodegradable polymers (PLA, PCL, PHB) instead of conventional petrochemical polymers. This substitution maintains adhesion performance while improving biodegradability and reducing environmental harm.
Solution Approach 2:
The patent creates a composite adhesive formulation combining multiple biodegradable polymer components (PLA, PCL, PHB) with specific ratios to achieve both favorable adhesion properties and biodegradability. The composite structure allows optimization of both performance and environmental compatibility.
2Object-affected harmful factors
If biodegradable polymers are used to improve environmental compatibility, then biodegradability increases, but adhesion performance may deteriorate
Solution Approach 1:
The patent formulates a composite system using biodegradable polymers (PLA, PCL, PHB) in specific combinations and ratios to achieve both biodegradability and adequate adhesion strength. The synergistic effect of multiple biodegradable components compensates for the lower individual adhesion performance.
Solution Approach 2:
The patent optimizes parameters such as polymer molecular weight, composition ratios, and processing conditions to enhance adhesion performance of biodegradable polymers while maintaining their biodegradable nature.
3Strength
If tackifier is added to improve adhesion, then adhesion increases, but the formulation complexity and cost increase
Solution Approach 1:
The patent removes the tackifier component from the adhesive formulation, relying instead on the inherent adhesion properties of the biodegradable polymer blend. This simplifies the formulation while maintaining acceptable adhesion performance for the intended applications.
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 adhesive exhibits favorable adhesion, biodegradability, and desirable properties like setting time, open time, and softening point without the use of a tackifier, offering a cost-effective and environmentally friendly alternative to traditional HMAs.
Implementation Method 1
a copolymer comprising a repeating unit of formula (Ia) a repeating unit of formula (Ib) and one or more first C 2-10 -hydrocarbons each independently substituted with 2-6 substituents each independently selected from O and OH... and polyvinyl alcohol (PVA)
Implementation Method 2
Biodegradable hot melt adhesives comprising a copolymer... It is well known that many conventional HMAs and polymers comprised therein are not biodegradable
Implementation Method 3
Hot melt adhesives (HMAs) are solid at room temperature and become liquid when heated above their softening point
Implementation Method 4
After the application of the HMAs in molten stage, the HMAs wet the surface of the substrates
Data Source
AI summary
Disclosed is a hot melt adhesive, a method for the preparation and uses thereof. More particularly, disclosed is a biodegradable hot melt adhesive comprising a copolymer, and polyvinyl alcohol (PVA).