Silicon Compound Processing Aid for Polyolefin Extrusion
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Solution Overview
Problem
Polyolefin compositions face challenges in achieving high energy input and throughput during extrusion without degrading, requiring lower extrusion temperatures and reduced retention time while maintaining surface quality.
Innovation Solution
Incorporating a silicon-containing compound as a processing aid with a specific structure, such as hexadecyl trimethoxy silane, which enhances mixing and dispersion, and when used with a silanol condensation catalyst, allows for extrusion at lower temperatures and increased throughput, maintaining surface quality and reducing retention time in the extruder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher energy input is applied to improve mixing and dispersion, then mixing quality improves, but temperature increases causing polyolefin degradation
Solution Approach 1:
A silicon-containing compound is introduced as an intermediary processing aid between the polyolefin components and the extrusion process. This compound facilitates improved mixing and dispersion at lower temperatures by acting as a mediator that enhances the interaction between polymeric components and additives, thereby achieving good dispersion quality without causing polyolefin degradation through excessive heat
Solution Approach 2:
The invention changes the processing parameters by introducing a silicon-containing compound that enables effective mixing at lower temperatures. This parameter change allows the process to operate in a different regime where dispersion quality is improved without reaching the temperature threshold that causes polyolefin degradation
2Productivity
If higher output of extruder is achieved, then productivity increases, but temperature increases causing polyolefin degradation
Solution Approach 1:
The silicon-containing compound serves as a processing aid intermediary that enables higher extruder output by improving the flow and mixing characteristics of the polyolefin composition, allowing increased productivity without the temperature rise that would lead to polyolefin degradation
3Reliability
If extrusion temperature is reduced to avoid degradation, then polyolefin stability improves, but mixing and dispersion quality deteriorates
Solution Approach 1:
The silicon-containing compound acts as a processing aid that mediates the mixing process at lower temperatures, enabling good dispersion quality to be achieved without compromising polyolefin stability. The compound facilitates interaction between components at reduced temperatures where it would otherwise be difficult to achieve proper mixing
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 silicon-containing compound enables extrusion at significantly lower temperatures with improved dispersion and high output, extending production campaigns, maintaining surface smoothness, and reducing retention time in the extruder, even after storage, by acting as a compatible processing aid and cross-linking agent.
Implementation Method 1
mixing, and hence dispersion of the additives, can be improved
Implementation Method 2
due to an increase of temperature of the polyolefin composition created by friction
Implementation Method 3
when used with a silanol condensation catalyst, allows for extrusion at lower temperatures
Data Source
AI summary
The present invention relates to the use of a silicon containing compound for reducing the retention time of a polyolefin composition comprising a crosslinkable polyolefin with hydrolysable silane groups. A master batch is compounded with the polyolefin composition to form a compounding composition. The master batch comprises a matrix polymer, a Bronsted acid that is a silanol condensation catalyst and is present in the amount of 0.7 to 3.5 wt %, and a silicon containing compound with a structure according to the formula (I): (R1)x[Si(R2)y(R3)z]m wherein R1 is C6-22 alkyl, R2 is C1-10 alkoxy, R3 is —R4SiR1R2 , R4 is —(CH2)rYs(CH2)t— where Y is a difunctional heteroatomic group, x+y+z=4, and m=1. The silicon containing compound is 2 to 10 wt % of the master batch, and 0.01 to 1.5 wt % of the compounding composition.