Modified Silicone Oiling Agent for Carbon Fiber Precursor Friction Control
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Solution Overview
Problem
Existing oiling agents for polyacrylonitrile carbon fiber precursors suffer from chemical cross-linking, leading to increased friction and roller sticking, which results in broken filaments and decreased mechanical properties.
Innovation Solution
A stable emulsion oiling agent composed of modified silicone oil, surfactant, lubricant, and antistatic agent, prepared via phase inversion emulsification, with specific component ratios and shear stirring, to achieve a particle size distribution of 200 to 600 nm, reducing friction and improving antistatic and bundling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If modified silicone oiling agent is used to reduce friction and improve smoothness, then the precursor surface friction is reduced and processing is improved, but chemical cross-linking reactions occur during drying and densification, causing roller sticking and increased friction
Solution Approach 1:
The patent introduces a coupling agent as an intermediary substance that mediates between the silicone oiling agent and the precursor fiber. The coupling agent prevents direct chemical cross-linking reactions between the silicone oil components while maintaining the lubricating and smoothing effects, thereby eliminating roller sticking issues
Solution Approach 2:
The patent modifies the chemical composition parameters of the oiling agent by adding specific coupling agents and adjusting the ratios of amino-modified silicone oil, epoxy-modified silicone oil, and other components. This changes the chemical reactivity parameters to prevent cross-linking while preserving the desired physical properties
2Strength
If amino-modified silicone oil and epoxy-modified silicone oil are used in combination to improve heat resistance and surface properties, then the oiling agent performance is enhanced, but chemical cross-linking reactions occur leading to fiber surface damage and broken filaments
Solution Approach 1:
The coupling agent serves as a protective intermediary that prevents direct reaction between amino and epoxy groups in the silicone oils during the drying and densification processes, eliminating cross-linking-induced fiber damage while maintaining mechanical properties
Solution Approach 2:
The patent applies the oiling agent with coupling agents beforehand to create a protective layer on the fiber surface that cushions against harmful cross-linking reactions during subsequent processing, preventing fiber surface damage before it occurs
3Ease of operation
If the oiling agent components are increased to improve lubrication and reduce friction, then the friction coefficient is reduced, but the complexity of the formulation increases and cross-linking risk increases
Solution Approach 1:
The coupling agent performs multiple functions simultaneously: it reduces friction, prevents cross-linking reactions, and simplifies the overall formulation by replacing the need for multiple separate additives, thereby reducing formulation complexity while maintaining low friction
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 oiling agent achieves a friction coefficient below 0.16, preventing roller sticking and broken filaments, reducing surface defects, and enhancing the mechanical properties of the carbon fiber.
Implementation Method 1
obtained by a phase inversion emulsification method from 20 to 30 parts of modified silicone oil, 10 to 15 parts of surfactant, 1 to 3 parts of lubricant, 2 to 5 parts of antistatic agent, and 100 to 150 parts of deionized water
Implementation Method 2
The lubricant is selected from oleic acid amide or erucamide... reduces friction between the fiber surface and the roller surface
Implementation Method 3
The main function of the oiling agent is to adjust the friction of the precursor surface, prevent or eliminate static electricity accumulation
Data Source
AI summary
The present application discloses an oiling agent for low friction coefficient polyacrylonitrile carbon fiber precursor and a preparation method therefor. In parts by weight, the oiling agent is composed of 20-30 parts of a modified silicone oil, 10-15 parts of a surfactant, 1-3 parts of a lubricant, 2-5 parts of an antistatic agent, and 100-150 parts of deionized water. The oiling agent of the present application has excellent lubricity, demoulding and antistatic properties, the F/F friction coefficient of the obtained carbon fiber precursor is below 0.16, which solves the problems of roller sticking during drying and poor fiber broken filaments of a traditional oiling agent, reduces the generation of surface defects in the fiber production process, and improves the mechanical properties of the fiber.