Ethylene Polymer Lubricant Composition for Self-Polymerization Control
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Solution Overview
Problem
Ethylene-based polymers face issues of self-polymerization during high temperature and pressure processing, leading to equipment clogging, reduced yield, and process instability, which existing oxidation stabilizers like butylated hydroxytoluene fail to adequately address.
Innovation Solution
A lubricant composition comprising a white mineral oil and an oxidation stabilizer with specific alkyl group substitutions, ensuring solubility of 0.1 g/100 g or more in the oil, inhibits self-polymerization effectively, preventing equipment damage and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature and pressure are applied to polymerize ethylene and comonomer, then polymerization reaction is enhanced, but self-polymerization of monomer occurs causing equipment clogging
Solution Approach 1:
The patent introduces a specific oxidation stabilizer as an intermediary substance that interferes with the self-polymerization process. This stabilizer acts as a mediator between the monomer and the polymerization reaction, preventing unwanted self-polymerization while allowing controlled polymerization to proceed, thus resolving the contradiction between enhancing polymerization efficiency and preventing harmful self-polymerization
Solution Approach 2:
The patent modifies the chemical parameters of the system by introducing a specific oxidation stabilizer with defined molecular structure (Formula 1) and concentration ranges (0.1-2.0 wt%). This parameter change alters the reaction environment to suppress self-polymerization while maintaining desired polymerization efficiency, addressing the contradiction between productivity and harmful self-polymerization
2Reliability
If conventional oxidation stabilizers like butylated hydroxytoluene are used, then some inhibition of self-polymerization is achieved, but equipment clogging and plugging still occur
Solution Approach 1:
The patent changes the chemical parameters of the oxidation stabilizer by specifying a particular molecular structure (Formula 1 with specific alkyl groups) and concentration range (0.1-2.0 wt%). This refined parameter change improves the stabilizer's effectiveness in preventing equipment clogging while maintaining process stability, overcoming the limitations of conventional stabilizers
Solution Approach 2:
The patent creates a composite lubricant composition by combining white mineral oil with the specific oxidation stabilizer (Formula 1). This composite material synergistically prevents equipment clogging and maintains process stability better than conventional single-component stabilizers, resolving the contradiction between reliability and preventing equipment clogging
3Productivity
If monomer is supplied through compressor at high pressure, then polymerization is enabled, but self-polymerization occurs during supply process
Solution Approach 1:
The patent applies preliminary action by introducing the oxidation stabilizer into the lubricant composition before the monomer enters the compressor. This pre-treatment prevents self-polymerization from occurring during the supply process, ensuring that the monomer remains stable throughout compression and delivery, thus maximizing production yield without harmful side reactions
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 lubricant composition significantly reduces self-polymerization, preventing equipment clogging and enhancing polymerization efficiency and yield, while being safe for food packaging applications.
Implementation Method 1
an oxidation stabilizer represented by Formula (1)... to inhibit the clogging and plugging... directly inhibiting self-polymerization of the monomer
Implementation Method 2
a lubricant composition for preparing an ethylene-based polymer... injecting the lubricant composition into a compression device
Data Source
AI summary
A lubricant composition for preparing an ethylene copolymer according to embodiments of the present disclosure includes a base oil including a white mineral oil, and an oxidation stabilizer represented by Formula 1. The oxidation stabilizer may have a solubility of 0.1 g/100 g or more in the white mineral oil at 25° C.