V-Belt Elastomer with Functionalized Silica for Dynamic Load Resistance
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Solution Overview
Problem
Conveyor and power transmission belts face challenges in achieving satisfactory service life under high dynamic loads due to the use of carbon black fillers, which contain volatile organic components and cause black abrasion, while silica fillers have previously resulted in belt breakage under stress.
Innovation Solution
A belt with an elastomer base body and tension layers, where the elastomer is formed by radical crosslinking a mixture of ethylene-alpha-olefins with silica filler, surface-functionalized to integrate into the crosslinking process, providing improved dynamic-mechanical properties and resistance to aging and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black filler is used in EPM belts, then dynamic mechanical properties are sufficient, but volatile organic components and black abrasion occur which are ecologically undesirable
Solution Approach 1:
The patent changes the chemical composition parameters of the filler material from carbon black to silica, and modifies the crosslinking method from sulfur-based to radical-based. This parameter change eliminates volatile organic components and black abrasion while maintaining dynamic mechanical properties through the functionalized silica-rubber complex formed during radical crosslinking.
Solution Approach 2:
The patent creates a composite material system consisting of functionalized silica filler integrated with EPM rubber matrix through radical crosslinking. The functional groups on silica surface (such as silane groups) form covalent bonds with rubber chains, creating a synergistic composite that achieves both ecological compatibility and mechanical performance.
2Object-affected harmful factors
If silica filler is integrated into EPM elastomers, then white filler and reduced emissions are achieved, but poor connection leads to belt breaking under stress
Solution Approach 1:
The patent introduces functional groups (such as silane, hydroxyl, or carboxyl groups) on the silica surface as intermediary bonding sites. These functional groups act as mediators that form covalent bridges between the silica filler particles and the EPM rubber chains during radical crosslinking, ensuring strong interfacial adhesion and stress transfer.
Solution Approach 2:
The patent changes the surface chemistry parameters of silica by introducing functional groups through surface treatment or use of pre-functionalized silica. This parameter modification enables chemical bonding between filler and matrix, transforming silica from a poorly connected inert filler to an actively bonded reinforcement that prevents belt breaking under stress.
3Ease of manufacture
If sulfur vulcanization is used for crosslinking, then conventional curing is achieved, but functionalized silica integration into crosslinking is not possible
Solution Approach 1:
The patent replaces the sulfur-based vulcanization mechanism with a radical-based crosslinking mechanism. This substitution enables the functional groups on silica surface to participate actively in the crosslinking reaction, forming covalent bonds between filler and matrix, while still maintaining a practical manufacturing process through peroxide or radiation-initiated radical generation.
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 results in a belt with enhanced dynamic-mechanical properties, reduced self-heating, longer shelf life of unvulcanized material, lower emissions, and improved low-temperature flexibility, along with the elimination of black abrasion, leading to increased service life and better running properties.
Implementation Method 1
The elastomer is formed by radical crosslinking a mixture of ethylene-alpha-olefins with silica filler, surface-functionalized to integrate into the crosslinking process
Data Source
Figure 1~3
AI summary
The V-belt (1) for high dynamic loads, which can be manufactured without sulfur components and carbon black, contains an elastomer obtainable by radical crosslinking of a mixture comprising (a) 51 to 99 phr of a first ethylene alpha olefin with an ethylene unit content of 40 to 54 wt.% based on the proportion of the first alpha olefin, (b) 1 to 49 phr of a second ethylene alpha olefin with an ethylene unit content of 55 to 78 wt.% based on the proportion of the second alpha olefin, wherein the sum of components (a) and (b) constitutes at least 50 wt.% of the weight fraction of the elastomer contained in the base body; (c) 1 to 30 phr of an ionic activator, (d) 10 to 90 phr of a filler comprising at least 80 wt.% of the ethylene alkyl ...The elastomer consists of a silica material with a specific surface area (according to BET) greater than or equal to 50 m²/g, which is surface-functionalized with functional groups or mixed with a functionalization reagent for the introduction of functional groups to the silica material. These functional groups are capable of radical crosslinking, e.g., with a double-linking system. The elastomer may be colored. It exhibits good dynamic test values and is particularly stable in the vulcanized state.