Resin Modified Starch Adhesive for Corrugated Board Strength
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Solution Overview
Problem
Conventional corn starch adhesives for corrugated boards lack sufficient adhesive strength and water resistance due to the weak chemical bonds in starch molecules, leading to issues like water absorption and salt accumulation, which affect the durability and environmental friendliness of the adhesives.
Innovation Solution
A resin modified starch adhesive is developed, comprising dry corn starch, epoxy resin, azido polyether, 3, 5-diamido-1, 2, 4-triazole, cyanoacrylate, sodium hypochlorite solution, sodium tripolyphosphate, hydrotalcite, kaolin, and sodium sulfate, which form a cross-network structure to enhance adhesive strength and water resistance through chemical bonding and the formation of tetrazole five-membered rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional corn starch adhesive is used, then the adhesive is easy to manufacture and low in cost, but the adhesive strength is insufficient and water resistance is poor
Solution Approach 1:
The patent combines corn starch with epoxy resin to create a composite adhesive system. The starch provides the base adhesive properties and ease of manufacture, while the epoxy resin contributes high adhesive strength and water resistance. This composite approach allows the final product to simultaneously achieve strong adhesion and remain relatively easy to manufacture.
Solution Approach 2:
The patent modifies the chemical parameters of starch through oxidation and introduces cross-linking agents (epoxy resin, cyanoacrylate) to change the molecular structure. These parameter changes transform the weak hydrogen bonding network of pure starch into a stronger cross-linked structure, significantly improving adhesive strength while maintaining the ease of starch-based processing.
2Ease of manufacture
If conventional corn starch adhesive is used, then the adhesive is easy to manufacture and low in cost, but the water resistance is poor due to water absorption and salt accumulation
Solution Approach 1:
By combining starch with hydrophobic epoxy resin and water-resistant additives (hydrotalcite, kaolin), the composite adhesive creates a protective barrier that reduces water absorption. The epoxy resin forms a water-resistant matrix that prevents water penetration, while the mineral additives provide additional water repellency, solving the water resistance issue while maintaining ease of manufacture.
Solution Approach 2:
The patent converts the naturally hydrophilic nature of starch into a benefit by using it as a base that can be modified. Through oxidation and cross-linking, the abundant hydroxyl groups in starch become sites for forming strong cross-links with epoxy resin, creating a structure where the original water-attracting groups are locked in a water-resistant network, transforming the harmful water absorption property into a beneficial water resistance feature.
3Object-affected harmful factors
If starch adhesive is used to replace sodium silicate, then the adhesive is non-corrosive and environmentally friendly, but the adhesive strength and durability are insufficient
Solution Approach 1:
The patent fundamentally changes the chemical parameters of starch through oxidation (introducing carbonyl and carboxyl groups) and cross-linking (forming ether and ester bonds). These parameter changes transform the weak, simple hydrogen bonding of native starch into a complex, strong cross-linked network that provides high adhesive strength and durability, while maintaining the non-corrosive, environmentally friendly nature of the starch-based system.
Solution Approach 2:
The patent creates a composite system where starch serves as the eco-friendly, non-corrosive base matrix, and epoxy resin provides the high strength and durability characteristics. This composite structure allows the adhesive to simultaneously achieve environmental friendliness (from starch) and high performance (from epoxy), resolving the contradiction between green chemistry and adhesive strength.
4Stability of the object's composition
If pure starch adhesive is used, then the adhesive has good toughness and flexibility, but the adhesive strength fails to meet application requirements due to weak hydrogen bonds
Solution Approach 1:
The patent changes the bonding parameters by introducing cross-linking agents that form strong covalent bonds (ether bonds from epoxy-starch reaction, ester bonds from cyanoacrylate-starch reaction). These covalent cross-links work together with the existing hydrogen bonds to create a dual-network structure that maintains the toughness and flexibility of the original starch while dramatically increasing the adhesive strength to meet application requirements.
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 modified adhesive exhibits improved adhesive strength, water resistance, antibacterial properties, and quick-drying effects, extending storage life and enhancing application performance.
Implementation Method 1
the azide groups in the molecules can react with cyanogroups in the cyanoacrylate to produce tetrazole five-membered ring structures
Implementation Method 2
The molecules of the azido polyether contain a large number of hydroxyl groups, which can form hydrogen bonds with hydroxyl groups, carboxyl groups and aldehyde groups in the starch
Implementation Method 3
the structure also contains reactive hydrogen, which can react with epoxy groups and hydroxyl groups, and further form a cross network together with the oxidized starch, the azido polyether and the epoxy resin
Implementation Method 4
triazole structures can further interact with the water-absorbing groups in the starch such as the hydroxyl groups, the carboxyl groups and the like to prevent the water-absorbing groups from directly interacting with water
Data Source
AI summary
The present disclosure provides a resin modified starch adhesive. The resin modified starch adhesive comprises, by weight, 100 parts of a dry starch, 300-500 parts of deionized water, 20-40 parts of an epoxy resin, 5-10 parts of an azido polyether, 1-2 parts of 3, 5-diamido-1, 2, 4-triazole, 1-3 parts of a cyanoacrylate, 5-10 parts of sodium hypochlorite solution, 3-8 parts of sodium tripolyphosphate, 2-5 parts of hydrotalcite, 3-8 parts of kaolin and 1-4 parts of sodium sulfate. The starch adhesive is prepared by modifying an oxidized starch emulsion with an epoxy resin modified by the azido polyether to introduce reactive functional groups and water-resisting five-membered ring structures, thus the shear strength and the water resistance of the adhesive are greatly improved.