Transparent Solid Glue pH Control and Drying Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Commercially available solid glues are strongly alkaline, leading to a short shelf life, viscosity decrease over time, quick drying, brittleness, and reduced bonding capacity, making them inconvenient for use and application.
Innovation Solution
A transparent solid glue composition comprising glycerol, propylene glycol, sticky substance, stearic acid, vegetable oil, protopine, fatty acid salt, and preservative, allowing for controlled drying time and improved formability and transparency, with a method involving mixing and heating steps to create a bubble-free semi-transparent liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solid glue is made by heating starch or sticky substance and adding protopine and higher fatty acids for saponification, then the glue has convenient carrying and firm gluing properties, but the glue becomes strongly alkaline (pH=11) resulting in short shelf life and yellowing
Solution Approach 1:
The patent changes the pH parameter of the glue from strongly alkaline (pH=11) to weakly alkaline (pH=9-10.5) by adjusting the saponification process and ingredient ratios. This parameter change extends the shelf life from 3-6 months to 12-24 months while maintaining the convenient solid form and gluing properties
Solution Approach 2:
The patent uses a composite formulation combining starch or sticky substance with protopine, higher fatty acids, and additional additives in specific ratios. This composite approach creates a balanced system that achieves both convenience and extended shelf life through synergistic interactions among components
2Reliability
If the shelf life of solid glue is increased, then the glue maintains stability longer, but the viscosity decreases causing thinning and yellowing
Solution Approach 1:
The patent optimizes the pH parameter to a specific range (9-10.5) that prevents both excessive alkalinity-induced yellowing and viscosity loss. This controlled parameter change allows the glue to maintain stable viscosity and transparency throughout the extended 12-24 month shelf life
Solution Approach 2:
The patent introduces additional additives as intermediaries that stabilize the glue composition during long-term storage. These additives act as buffers and stabilizers that prevent viscosity degradation and yellowing while maintaining the weakly alkaline environment necessary for extended shelf life
3Productivity
If solid glue dries quickly after application, then the bonding sets faster, but the position of objects cannot be adjusted and brittleness increases
Solution Approach 1:
The patent creates a dynamic drying process where the glue transitions from a slower-initial-dry state (allowing position adjustment) to a faster-final-dry state (achieving strong bonding). The composition is designed to control the evaporation and setting rates at different stages, providing operational flexibility followed by firm fixation
4Strength
If stearic acid is added to improve the hardness of the glue body, then the glue becomes more solid, but the plasticity of the glue body decreases
Solution Approach 1:
The patent optimizes the stearic acid content parameter within a specific ratio range (0.5-5% of total composition) to achieve the desired balance between hardness and plasticity. This controlled parameter adjustment ensures the glue body is solid enough for convenient handling while retaining sufficient plasticity for effective bonding
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 solution provides a transparent, environmentally friendly solid glue with controllable drying time, excellent adhesion, and extended shelf life, suitable for various applications from -5°C to 40°C, with high initial viscosity and strong adhesion after drying.
Implementation Method 1
Since glycerol, water, propylene glycol and vegetable oil have different volatile points, the complete drying time of the solid glue after applied onto the objects to be glued can be controlled by adjusting the ratio of glycerol, water, propylene glycol and vegetable oil in the solid glue
Implementation Method 2
the commercially available solid glue is usually made by directly heating to dissolve starch or sticky substance and then adding protopine and higher fatty acids to result in saponification
Implementation Method 3
directly heating to dissolve starch or sticky substance
Data Source
AI summary
A transparent solid glue, in mass percentage comprises: 10.0%-50.0% of glycerol, 5.0%-20.0% of propylene glycol, 5.0%-30.0% of sticky substance, 1.0%-10.0% of stearic acid, 0-5.0% of vegetable oil, 0.5%-5.0% of protopine, 0.1%-5.0 of excipient, 0.1%-0.5% of preservative, and 5.0%-70.0% of deionized water, wherein the excipient is C12-16 saturated or unsaturated fatty acid salt. The prepared transparent solid glue has high initial viscosity; and the drying time is controllable so that the gluing position of the objects to be glued can be adjusted according to actual requirements, which is convenient to use, and the glue exhibits strong adhesion after completely drying. Meanwhile, the addition of protopine causes the pH of the solid glue to be between 10.49-10.99, and accordingly the solid glue is an environmentally friendly solid glue. Within a temperature range from −5° C. to 40° C., this solid glue is widely applicable to gluing paper, wood pieces, photographic paper, paperboards and etc.