Method for preparing silane coupling agent/silica/plant fiber composite
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cement-based materials are brittle and prone to cracking due to insufficient interfacial bonding and corrosion resistance of plant fibers, limiting their application in building materials.
Innovation Solution
A method involving the preparation of a silane coupling agent/silica/plant fiber composite through steps of pretreating plant fiber, forming a silane coupling agent hydrolysate, immersing and drying the fiber, preparing a silica nanoparticle dispersion, and coating the fiber with silica nanoparticles to enhance interfacial bonding and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plant fiber is used to replace artificial synthetic fiber in cement-based materials, then cost is reduced and sustainability is improved, but interfacial bonding property and corrosion resistance are insufficient
Solution Approach 1:
The patent uses silane coupling agent and silica nanoparticles as intermediary substances between plant fiber and cement matrix. The silane coupling agent forms a bridge through chemical bonding, while silica nanoparticles fill the interface and enhance mechanical interlocking, thereby improving interfacial bonding without compromising the cost advantage of using plant fiber
Solution Approach 2:
The patent creates a composite modification system combining silane coupling agent and silica nanoparticles on the plant fiber surface. This composite approach allows the silane to provide chemical bonding while silica provides physical reinforcement and alkalinity resistance, synergistically solving both interfacial bonding and corrosion resistance issues
2Ease of manufacture
If plant fiber is used to replace artificial synthetic fiber in cement-based materials, then cost is reduced and sustainability is improved, but corrosion resistance is insufficient
Solution Approach 1:
The silane coupling agent acts as a protective intermediary layer between the plant fiber and the alkaline cement environment. This layer chemically bonds to the fiber surface and provides barrier protection against alkaline corrosion and calcium ion penetration, preserving the fiber's durability while maintaining the cost benefits of using plant-based material
Solution Approach 2:
The silane coupling agent creates a chemically inert protective environment around the plant fiber surface, shielding it from the harmful alkaline pore solution and calcium ions in the cement matrix. This inert barrier prevents dissolution of hemicellulose and lignin, maintaining fiber integrity over time
3Ease of operation
If plant fiber is directly used in cement matrix without surface modification, then process simplicity is maintained, but interfacial bonding property is insufficient
Solution Approach 1:
The patent applies preliminary surface modification treatment to the plant fiber before incorporating it into the cement matrix. The silane coupling agent and silica nanoparticles are pre-applied to the fiber surface, ensuring optimal interfacial bonding properties are established before the fiber is placed in the cement environment, rather than relying on post-hoc modifications
4Ease of operation
If plant fiber is directly used in cement matrix without surface modification, then process simplicity is maintained, but corrosion resistance is insufficient
Solution Approach 1:
The patent implements preliminary protective coating of the plant fiber surface with silane coupling agent and silica nanoparticles before cement matrix incorporation. This pre-treatment establishes corrosion resistance mechanisms in advance, preventing alkaline attack and calcium ion penetration from the outset, rather than requiring complex post-processing or specialized cement formulations
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 method improves the interfacial bonding and corrosion resistance of plant fibers, enhancing their performance in cement-based composites, making them suitable for toughening and arresting cracks in cement-based materials.
Implementation Method 1
a silane coupling agent hydrolysate
Implementation Method 2
Through the covalent interaction among a silanol group (Si—OH) formed by hydrolysis of the silane coupling agent, Si—OH of the silica, and a hydroxyl group (—OH) on the surface of the plant fiber
Implementation Method 3
Using a hydrophobic film formed by the silane coupling agent, harmful ions are prevented from invading
Implementation Method 4
Using the pozzolanic activity of the silica nanoparticles, the alkalinity and calcium hydroxide content around the fiber are reduced
Data Source
AI summary
A method for preparing a silane coupling agent/silica/plant fiber composite includes the following steps: S1: pretreating plant fiber; S2: preparing hydrolysate of a silane coupling agent; S3: preparing a silane coupling agent/plant fiber composite; S4: preparing a silica nanoparticle dispersion; and S5: preparing a silane coupling agent/silica nanoparticle/plant fiber composite. Through the covalent interaction among a silanol group (Si—OH) formed by hydrolysis of the silane coupling agent, Si—OH of the silica, and a hydroxyl group (—OH) on the surface of the plant fiber, the present invention enables silica nanoparticles to be grafted on the surface of the plant fiber. Using a hydrophobic film formed by the silane coupling agent, harmful ions are prevented from invading, and the volume stability of the fiber is improved. Using the pozzolanic activity of the silica nanoparticles, the alkalinity and calcium hydroxide content around the fiber are reduced.