Solid Carrier Component for Silicone Migration Control
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Solution Overview
Problem
Lower molecular weight silicone fluids, while offering benefits in extrusion processes such as reduced shear-related defects and lower energy requirements, face challenges of 'bleeding' and migration issues during pellet manufacturing and storage, similar to higher molecular weight solutions.
Innovation Solution
A solid carrier component comprising high density polyethylene and a bis-hydroxyl-functional polydiorganosiloxane, optionally with a maleated ethylene-based polymer and filler, is developed to minimize the migration of silicone fluids, ensuring stability and improved handling in wood plastic composite production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lower molecular weight silicone fluids are used, then extrusion process benefits are improved (reduced shear-related defects, lower energy requirements), but silicone fluid migration and bleeding issues occur during pellet manufacturing and storage
Solution Approach 1:
The patent introduces a carrier polymer (polyethylene, polypropylene, or polyester) as an intermediary substance that physically incorporates and contains the low viscosity silicone fluid. This carrier matrix prevents the silicone from migrating or bleeding during storage and handling, while still allowing the silicone to provide its beneficial low viscosity properties during extrusion processing.
Solution Approach 2:
The invention creates a composite material system combining the carrier polymer with the low molecular weight silicone fluid. This composite approach allows the silicone to maintain its low viscosity benefits for energy efficiency during processing, while the carrier polymer provides structural integrity and prevents migration during storage and handling.
2Reliability
If higher molecular weight silicone fluids are used, then silicone fluid migration is reduced, but extrusion process benefits are compromised (increased shear-related defects, higher energy requirements)
Solution Approach 1:
The patent separates the functions of viscosity control and migration prevention into two distinct components: the low molecular weight silicone fluid provides the desired low viscosity for energy efficiency during extrusion, while the carrier polymer matrix provides the structural framework that prevents migration during storage. This segmentation allows each component to optimize its specific function without compromising the other.
3Adaptability or versatility
If liquid silicone fluids are used as additives, then formulation flexibility is improved, but handling difficulty increases during injection molding and extrusion processes
Solution Approach 1:
The carrier polymer acts as a mediating substance that transforms the handling characteristics of the liquid silicone fluid. By incorporating the liquid silicone into the solid carrier matrix, the mixture maintains formulation flexibility and the beneficial properties of the silicone, while the solid carrier form enables easy handling during injection molding and extrusion processes.
Solution Approach 2:
The invention changes the physical state parameter of the silicone-containing formulation from liquid to solid (pellet or masterbatch form). This parameter change enables the formulation to be easily handled during processing while still allowing the liquid silicone component to provide its desired formulation flexibility and chemical properties when processed.
Data Source
AI summary
A solid carrier component includes a liquid polydiorganosiloxane and an ethylene-based polymer. The solid carrier component is useful in processes for preparing wood plastic composite articles, such as building materials.