Dimensionally Stable Adhesive Mass for Plant Fiber Bonding
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Solution Overview
Problem
There is a need for a dimensionally stable, water- and solvent-free adhesive that can be applied without a special applicator, is skin-friendly, and maintains high bonding strength for materials like paper and cardboard, while being non-sticky at room temperature and having sufficient initial adhesion to bond substrates without requiring pressure for setting.
Innovation Solution
A formulation comprising 45-85% natural resin with a hydroxyl and acid number of at least 100 mg KOH/g, 5-50% polyester, and 5-20% C12-C22 fatty acids, which provides low tack for easy application, sets to form a strong adhesive film, and maintains stability up to 70°C, ensuring effective bonding of plant fiber materials without curling or tearing flexible substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adhesive is formulated to be dimensionally stable and non-sticky at room temperature, then it can be stored and handled easily without packaging, but it becomes difficult to apply to substrates without requiring heat activation or special applicators
Solution Approach 1:
The adhesive composition changes its physical state based on temperature parameters. At room temperature, it maintains dimensional stability with low tackiness for easy handling. When heated to 40-80°C, the polyester component becomes more fluid, enabling the adhesive to be applied to substrates. This temperature-dependent parameter change allows the same material to satisfy both storage stability and application requirements without needing different formulations or special applicators.
2Stability of the object's composition
If the adhesive is made water-free and solvent-free for stability and ease of storage, then it requires no special packaging to prevent drying, but it loses the ability to be easily activated and applied by simple rubbing or contact
Solution Approach 1:
The adhesive utilizes phase transition of the polyester component in response to temperature changes. The polyester remains in a solid or semi-solid state at room temperature, providing dimensional stability and preventing drying. When heated, it transitions to a more fluid phase that enables easy application to substrates through rubbing or contact, then re-solidifies upon cooling to form a stable bond.
3Strength
If the adhesive has high initial tackiness to bond substrates immediately, then substrates are fixed in position while the adhesive sets, but the adhesive becomes permanently sticky and contaminates skin during application
Solution Approach 1:
The adhesive's tackiness is controlled by temperature parameters. During application at elevated temperature (40-80°C), the adhesive has moderate tackiness sufficient for bonding plant fiber substrates like paper and cardboard. As the adhesive cools to room temperature after application, it transitions to a non-sticky state that prevents skin contamination while maintaining the bonded substrates in fixed position. This parameter change ensures high initial adhesion without permanent stickiness.
4Strength
If the adhesive is formulated with high resin content for strong bonding, then bonding strength to plant fibers is improved, but the adhesive becomes more sticky and difficult to apply without heating
Solution Approach 1:
The adhesive is formulated as a composite material combining resin (45-85 wt.%) for bonding strength, polyester (5-50 wt.%) for temperature-responsive fluidity, and fatty acids (5-20 wt.%) for adhesion enhancement. The polyester component acts as a temperature-sensitive matrix that keeps the high-resin formulation stable and non-sticky at room temperature, while becoming fluid at elevated temperatures to enable easy application. This composite structure allows high resin content for strong bonding without permanent stickiness.
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 achieves high initial adhesion and bonding strength for plant fiber materials, allowing for easy application and storage without packaging, with a balanced property profile that includes low stickiness and high dimensional stability, ensuring effective bonding without the need for additional pressure or special handling.
Implementation Method 1
applied in such a way that a thin film of the adhesive is transferred to the substrate by rubbing at the contact point
Implementation Method 2
a thin adhesive film is applied
Data Source
AI summary
The present invention relates to a dimensionally stable adhesive compound formulated largely free of water and solvents, which can be applied as a thin adhesive film by rubbing it into contact with the substrate to be bonded. This adhesive compound is particularly suitable for bonding materials derived from plant fibers. The adhesive compound according to the invention comprises a resin, in particular a natural resin, the sum of which of the hydroxyl and acid values is at least 100 mg KOH/g, a polyester, and fatty acids. The adhesive compound exhibits high temperature stability and does not become sticky when used by hand or in contact with skin. The invention also relates to a method for applying an adhesive film to a planar substrate, preferably paper, by rubbing the adhesive compound at the point of contact with the substrate.