Antistatic Rubber Composition for Paper Feed Rollers
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Solution Overview
Problem
Existing rubber compositions for paper feed rollers face issues with insufficient dispersion of polymer-type antistatic agents, leading to defects in appearance and physical properties, and lack of wear resistance, especially when not crosslinked or weakly crosslinked.
Innovation Solution
Incorporating a polyether/polyolefin block copolymer resin as an antistatic agent into the rubber composition at a temperature equal to or higher than its melting point, ensuring uniform dispersion and enhancing antistatic ability and wear resistance, along with using a peroxide crosslinking agent to prevent friction coefficient reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer type antistatic agent is blended into the rubber composition, then the antistatic ability is improved and durability is enhanced, but the agent does not sufficiently disperse and remains as clumps due to high melting point
Solution Approach 1:
The patent changes the physical state parameter of the antistatic agent from solid to liquid by using a low-melting-point wax-based antistatic agent. This allows the agent to be uniformly dispersed in the rubber composition during standard mixing processes without requiring excessive heat that would damage the rubber. The liquid state at mixing temperature enables complete penetration and uniform distribution throughout the rubber matrix.
Solution Approach 2:
The patent utilizes the phase transition property of wax-based materials, which are solid at room temperature but become liquid at mixing temperatures. This phase transition enables the antistatic agent to flow and disperse uniformly during mixing, then re-solidify upon cooling to maintain its antistatic function. The reversible solid-liquid transition solves the dispersion problem while preserving the agent's effectiveness.
2Manufacturing precision
If the kneading temperature is set to be high to melt the polymer type antistatic agent, then dispersion is improved, but deterioration of the rubber component and other compounding agents occurs
Solution Approach 1:
The patent fundamentally changes the temperature parameter requirement by selecting a wax-based antistatic agent with a melting point below the rubber processing temperature. This eliminates the need for high-temperature kneading specifically for agent dispersion, allowing standard processing temperatures to be used without causing rubber degradation while still achieving complete agent dispersion.
3Reliability
If an antistatic agent with a low molecular weight is blended in, then the antistatic ability is improved, but the coefficient of friction decreases and paper feeding failures occur
Solution Approach 1:
The patent optimizes the molecular weight parameter of the antistatic agent by using waxes with molecular weights specifically in the range that provides both antistatic functionality and adequate friction. The wax-based agents have higher molecular weights than low-molecular-weight antistatic agents, which prevents excessive friction reduction and paper feeding failures while still delivering effective antistatic performance.
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 rubber composition achieves uniform antistatic agent dispersion, excellent antistatic ability, and improved wear resistance, preventing paper feeding failures and maintaining effective paper conveyance over time.
Implementation Method 1
mixed into a rubber component at a temperature equal to or higher than a melting point of the polyether/polyolefin block copolymer resin
Implementation Method 2
a paper feed roller obtained by crosslinking the composition
Data Source
AI summary
There is provided a rubber composition in which an antistatic agent is uniformly dispersed and the rubber composition has antistatic ability, coefficient of friction, and wear resistance. A rubber composition includes 7 parts by mass or more of a polyether/polyolefin block copolymer resin with respect to 100 parts by mass of a rubber component, and the total amount or a part of a rubber component is mixed with a polyether/polyolefin block copolymer resin at a temperature that is equal to or higher than a melting point of the polyether/polyolefin block copolymer resin.