Olefin Polymer Surface Material Suppressing Silicone Bleeding
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Solution Overview
Problem
Existing resin-based molded products used in applications like motor vehicle seals and interior materials face issues with excessive bleeding of silicone compounds, leading to impaired slidability and appearance, due to high process oil content which increases bleeding.
Innovation Solution
A surface material comprising a matrix of olefin-based polymer with a domain of cross-linked or non-cross-linked ethylene vinyl acetate copolymer and a silicone compound, which effectively suppresses silicone bleeding, enhancing slidability, adhesion prevention, and gloss improvement, while maintaining high plasticity and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If process oil content is increased to enhance plasticity, then plasticity is improved, but silicone bleeding increases
Solution Approach 1:
The patent introduces an intermediary substance (wax or fatty acid) between the silicone compound and the process oil to prevent direct interaction that causes bleeding. This intermediary acts as a barrier that allows the process oil to provide plasticity while preventing silicone from migrating to the surface
Solution Approach 2:
The patent creates a composite resin composition containing multiple components: base resin, process oil, silicone compound, and intermediary substance (wax or fatty acid). This composite structure allows the components to work together synergistically, where the intermediary substance mediates between the process oil and silicone to achieve both plasticity and bleeding suppression
2Ease of operation
If bleeding substance is blended in resin to improve slidability and adhesion prevention, then these functions are enhanced, but excessive bleeding occurs when process oil is present in inner layer
Solution Approach 1:
The intermediary substance (wax or fatty acid) serves as a mediator that prevents process oil from extracting silicone from the surface layer. This allows the surface layer to maintain its silicone content for slidability while the intermediary blocks the bleeding pathway that would otherwise be created by process oil in the inner layer
Solution Approach 2:
The patent changes the chemical and physical parameters of the resin system by introducing wax or fatty acid components. This alters the solubility parameters and interaction characteristics between process oil and silicone, preventing the bleeding phenomenon while maintaining the desired plasticity and slidability functions
Data Source
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AI summary
The present invention provides a surface material comprising, in a matrix composed of an olefin-based polymer, a domain composed of a cross-linked ethylene vinyl acetate copolymer or a non-cross-linked ethylene vinyl acetate copolymer, and a silicone compound.