Modified Lignin Reinforced Rubber Dispersion and Bonding
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Solution Overview
Problem
The limited development of lignin in the rubber field due to uneven dispersion and weak bonding strength between lignin and rubber, leading to agglomeration and inadequate property improvement, necessitates a new, energy-efficient, and environmentally friendly modification method.
Innovation Solution
Modification of lignin using compounds with carbon-carbon double bonds, sulfur elements, and hydroxyl-blocking agents to enhance bonding with rubber, improve dispersion, and reduce polarity, thereby improving mechanical properties and reducing vulcanizing agent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lignin is directly applied to rubber, then the filler content increases, but the lignin particles agglomerate due to weak interaction and lack of filler network
Solution Approach 1:
The patent applies chemical modification to change the parameters of lignin by introducing carbon-carbon double bonds through compounds like vinyltrimethoxysilane and zinc acrylate. This chemical transformation enables the lignin to form filler networks and interact strongly with rubber, resolving the agglomeration issue while maintaining high filler content
Solution Approach 2:
The patent creates a composite structure by combining modified lignin with rubber, where the lignin particles form a network framework within the rubber matrix. This composite approach allows the filler to be evenly distributed and integrated, preventing agglomeration while maximizing filler content
2Manufacturing precision
If lignin is ground to improve dispersion, then the particle size becomes more uniform, but energy consumption increases and dust pollution occurs
Solution Approach 1:
The patent performs chemical modification of lignin before the mixing and vulcanization process. By pre-modifying the lignin with coupling agents to improve its compatibility and dispersion characteristics, the need for extensive mechanical grinding is reduced, thereby lowering energy consumption and dust generation while achieving uniform particle size distribution
Solution Approach 2:
The patent replaces the mechanical grinding process with chemical modification. Instead of using mechanical force to achieve uniform particle size, the invention uses chemical reactions to modify lignin surface properties, improving dispersion through chemical compatibility rather than physical size reduction
3Ease of manufacture
If conventional modification methods are used, then the lignin can be processed, but the interaction between lignin and rubber remains insufficient
Solution Approach 1:
The patent introduces carbon-carbon double bonds into the lignin structure through chemical modification with compounds containing these functional groups. This parameter change enables the modified lignin to participate in vulcanization reactions with rubber, creating strong covalent bonds and significantly enhancing the interaction strength between filler and matrix
Solution Approach 2:
The patent utilizes sulfur-containing compounds and peroxides to accelerate the crosslinking reaction between modified lignin and rubber. These strong oxidizing agents promote the formation of sulfur bridges and covalent bonds, significantly enhancing the bonding strength and crosslinking density of the rubber composite
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 lignin exhibits improved binding forces and interaction with rubber, enhancing mechanical properties and dispersibility, while reducing energy consumption and environmental impact.
Implementation Method 1
the contained double bond can generate a bonding effect with olefins in the rubber, to improve a binding force between the lignin and the rubber
Implementation Method 2
the ionic crosslink was generated during the vulcanization of the rubber, thus improving the mechanical properties of the rubber
Implementation Method 3
the modified lignin contains a certain sulfur element, which can further improve the binding force with the rubber in a vulcanization process
Data Source
AI summary
A modified lignin reinforced rubber is obtained by subjecting a lignin to composite modification by a compound containing a carbon-carbon double bond, a compound containing a sulfur element and a compound capable of blocking a hydroxyl; the lignin is modified with the compound containing the carbon-carbon double bond, and the contained double bond and an olefin in the rubber generate a bonding effect, which improves a binding force between the lignin and the rubber; furthermore, by modifying the lignin with the compound containing the sulfur element, the lignin contains a certain amount of the element sulfur, which improves an interaction between the lignin and the rubber, improves properties of the rubber, and reduces the use of a vulcanizing agent, and further increases a replacement amount of the lignin to carbon black.