EVOH Resin Coloration Suppression via Boron Stabilizers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
EVOH resin compositions are prone to thermal degradation and coloration during melt forming, which reduces productivity and affects the quality of multilayer structures used in packaging materials.
Innovation Solution
Incorporating a specific amount of an alkali earth metal compound and a sorbic acid ester into the EVOH resin composition, with a controlled weight ratio, to suppress coloration and improve melt viscosity properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EVOH is used for its excellent gas barrier properties and mechanical strength, then packaging quality is improved, but the resin is susceptible to thermal degradation and coloration during melt forming
Solution Approach 1:
A boron compound is introduced as an intermediary substance between the EVOH resin and thermal degradation. The boron compound acts as a heat stabilizer that intercepts and neutralizes harmful thermal effects, preventing direct damage to the EVOH polymer chains during melt forming processes.
Solution Approach 2:
The invention changes the chemical composition parameters of the resin system by adding specific amounts of boron compounds (0.001-10 parts by weight per 100 parts of EVOH). This parameter modification transforms the thermal stability characteristics of the EVOH, enabling it to withstand melt forming temperatures without excessive coloration or degradation.
2Adaptability or versatility
If forming apparatuses are made highly sophisticated to meet diversified requirements, then product functionality is improved, but resin thermal degradation and coloration increase, reducing productivity
Solution Approach 1:
The boron compound is pre-added to the EVOH resin composition before the forming process. This preliminary stabilization ensures that when the resin undergoes subsequent melt forming in sophisticated apparatuses, it is already protected against thermal degradation, maintaining productivity despite increased process complexity.
Data Source
AI summary
An ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer; (B) an alkali earth metal compound; and (C) a sorbic acid ester; wherein the sorbic acid ester (C) is present in an amount of 0.00001 to 10 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition; wherein the ratio (B)/(C) of the weight of the alkali earth metal compound (B) on a metal basis to the weight of the sorbic acid ester (C) is 10 to 30,000. The ethylene-vinyl alcohol copolymer composition is less susceptible to coloration.