Tannic Acid Derivative Adhesive for Strong Bonding
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Solution Overview
Problem
Conventional adhesives based on synthetic materials, such as epoxy resins, pose health risks and have inadequate adhesive strength for general-purpose applications on metals, woods, and glasses, while naturally occurring material-based adhesives like TA/PEG mixtures lack sufficient tensile shear strength for these materials.
Innovation Solution
A two-pack adhesive composition comprising a tannic acid derivative with a chain hydrocarbon group and a hydrocarbon having cyanate groups, where the tannic acid derivative is produced by reacting tannic acid with a chain hydrocarbon containing an epoxy group, and the mixture is applied with a specific molar ratio and heat treatment to achieve strong bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy-based adhesives are used, then strong adhesive force is achieved, but health problems arise due to BPA content
Solution Approach 1:
The invention changes the chemical composition parameters by replacing BPA-based epoxy resins with tannic acid derivatives that have similar adhesive properties but different safety characteristics. The tannic acid derivative is synthesized with specific molecular weight and hydroxyl group content to match the performance of conventional epoxy adhesives while eliminating harmful BPA content.
Solution Approach 2:
The invention uses a composite system combining tannic acid derivative with PEG and optional additives to create an adhesive formulation that achieves epoxy-like strength without the harmful components. The composite nature allows optimization of both adhesive performance and biocompatibility through component selection and ratio adjustment.
2Object-affected harmful factors
If TA/PEG mixture is used, then health safety is improved, but adhesive force becomes insufficient for general-purpose applications
Solution Approach 1:
The invention modifies the TA/PEG system by introducing tannic acid derivatives with specific molecular characteristics and adjusting the PEG molecular weight and ratio. These parameter changes enhance the adhesive strength from the original 1-20 kPa range to meet the 1 MPa tensile shear strength requirement for general-purpose applications, while preserving the health safety benefits.
Solution Approach 2:
The invention creates an optimized composite formulation combining tannic acid derivative, PEG of specific molecular weight, and optional reinforcing additives to achieve both high adhesive strength and biocompatibility. The composite structure allows synergistic interaction between components to overcome the strength limitations of simple TA/PEG mixtures.
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 composition provides a strong tensile shear strength of at least 1 MPa on various adherends, including metals, woods, and glasses, while being less harmful to human health and offering bactericidal, sterilizing, and gas-adsorbing properties.
Implementation Method 1
the first pack contains a tannic acid derivative in which a hydrogen atom in at least some hydroxyl group of tannic acid is substituted by a chain hydrocarbon group having at least one hydroxyl group, and the second pack contains a hydrocarbon having at least two cyanate groups or a derivative of the hydrocarbon
Data Source
AI summary
The present invention has for its object to provide an adhesive composition that is based on a naturally occurring material less likely to have adverse influences on the human body and has a tensile shear strength (adhesive strength) of at least 1 MPa with respect to a variety of adherends. The present invention provides an adhesive composition including at least a first pack and a second pack, wherein the first pack contains a tannic acid derivative in which a hydrogen atom in at least some hydroxyl group of tannic acid is substituted by a chain hydrocarbon group having at least one hydroxyl group, and the second pack contains a hydrocarbon having at least two cyanate groups or a derivative of the hydrocarbon.