Cellulose Ester Composition with Citrate Plasticizer for Water Spot Suppression
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Solution Overview
Problem
Cellulose esters exhibit poor thermoplasticity and are prone to water spots in molded articles, limiting their mechanical strength and fluidity.
Innovation Solution
A cellulose ester composition comprising 100 parts of a cellulose ester, 19-45 parts of a citrate-based compound with low water solubility, and 1-9 parts of an adipate-based compound, which enhances fluidity and suppresses water spots in molded articles while improving flexural modulus and impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plasticizer is added to improve thermoplasticity, then fluidity and mechanical strength are improved, but water spots occur on the molded article surface
Solution Approach 1:
The invention changes the chemical composition parameters by selecting specific plasticizers with low water solubility (citrate-based compounds with solubility ≤2g/100mL) and controlling their content within 19-45 parts by mass per 100 parts of cellulose ester. This parameter optimization prevents water spots while maintaining thermoplasticity
Solution Approach 2:
The invention uses a composite plasticizer system combining citrate-based compounds (19-45 parts) with adipate-based compounds (1-9 parts) to achieve synergistic effects. This composite approach improves both thermoplasticity and water spot resistance compared to single plasticizers
2Productivity
If plasticizer content is increased to improve fluidity, then molding processability is improved, but mechanical strength deteriorates
Solution Approach 1:
The invention optimizes plasticizer content parameters within specific ranges (citrate: 19-45 parts, adipate: 1-9 parts per 100 parts cellulose ester) to achieve the balance between fluidity and mechanical strength, avoiding both insufficient and excessive plasticizer addition
3Ease of operation
If conventional plasticizers are used to improve thermoplasticity, then processing is facilitated, but flexural modulus and impact strength are insufficient
Solution Approach 1:
The invention employs a composite plasticizer system where citrate-based compounds (providing low water solubility and good thermoplasticity) are combined with adipate-based compounds (enhancing mechanical properties). This composite formulation achieves both ease of processing and high flexural modulus with good impact strength
Data Source
AI summary
To provide a cellulose ester composition having good fluidity and being capable of providing a molded article that can suppress occurrence of a water spot. A cellulose ester composition containing: (A) 100 parts by mass of a cellulose ester, (B) from 19 to 45 parts by mass of a citrate-based compound having a solubility in water of 2 g/100 mL or less, and (C) from 1 to 9 parts by mass of an adipate-based compound.