Cellulose Acetate Resin Composition Thermal Fluidity
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Solution Overview
Problem
Conventional resin compositions containing cellulose acetate suffer from poor thermal fluidity due to intramolecular and intermolecular hydrogen bonding, leading to issues during molding processes, and the addition of plasticizers can result in precipitation within the molded body.
Innovation Solution
A resin composition comprising cellulose acetate with a weight average polymerization degree of 120 to 330 and an acetyl group substitution degree of 2.10 to 2.60, combined with a low molecular weight (meth)acrylic polymer and a plasticizer, which enhances thermal fluidity by reducing hydrogen bonding between cellulose acetate molecules and minimizes plasticizer precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional cellulose acetate resin is used with high molecular weight or high substitution degree, then the resin maintains good rigidity and structural stability, but the thermal fluidity deteriorates due to intramolecular and intermolecular hydrogen bonding
Solution Approach 1:
A boron-containing compound is introduced as an intermediary substance that interacts with cellulose acetate molecules to disrupt intramolecular and intermolecular hydrogen bonding. The boron compound acts as a mediator that reduces the harmful hydrogen bonding effects while preserving the structural stability of the high molecular weight cellulose acetate resin.
Solution Approach 2:
The invention changes the chemical parameter by introducing boron-containing compounds that alter the hydrogen bonding characteristics of cellulose acetate. This parameter change allows the resin to maintain high molecular weight and substitution degree (for structural stability) while reducing the negative effects of hydrogen bonding on thermal fluidity.
2Object-generated harmful factors
If plasticizer is added to improve thermal fluidity, then the molding process becomes easier, but plasticizer precipitation occurs within the molded body
Solution Approach 1:
The boron-containing compound serves as an intermediary that modifies the resin matrix to improve thermal fluidity without requiring plasticizer addition. By disrupting hydrogen bonding networks, the boron compound enables better flow characteristics while maintaining composition stability and preventing plasticizer precipitation.
Solution Approach 2:
The invention converts the harmful effect of hydrogen bonding (which causes poor thermal fluidity) into a benefit by using boron-containing compounds to selectively disrupt these bonds. This approach improves thermal fluidity through a different mechanism that does not involve plasticizer addition, thereby avoiding precipitation issues.
3Strength
If high molecular weight cellulose acetate (weight average polymerization degree > 330) is used, then the resin maintains good mechanical strength, but the thermal fluidity decreases
Solution Approach 1:
The boron-containing compound acts as a mediator that decouples the relationship between molecular weight and thermal fluidity. High molecular weight cellulose acetate (weight average polymerization degree 330-500) maintains mechanical strength while the boron compound disrupts hydrogen bonding to improve thermal fluidity, allowing both properties to coexist.
4Stability of the object's composition
If high substitution degree cellulose acetate (acetyl group substitution degree > 2.60) is used, then the resin achieves better chemical stability, but the thermal fluidity deteriorates due to enhanced hydrogen bonding
Solution Approach 1:
The boron-containing compound serves as a chemical intermediary that selectively interacts with the hydroxyl groups in high substitution degree cellulose acetate. By forming boron-oxygen complexes, it disrupts the hydrogen bonding network while preserving the chemical stability provided by high acetyl group substitution degree (2.60-2.80).
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 composition achieves improved thermal fluidity and reduced plasticizer precipitation, allowing for reduced plasticizer addition and maintaining the required rigidity of the resin molded body.
Implementation Method 1
Conventional resin compositions containing cellulose acetate suffer from poor thermal fluidity due to intramolecular and intermolecular hydrogen bonding
Implementation Method 2
the addition of plasticizers can result in precipitation within the molded body
Data Source
AI summary
Provided is a resin composition containing: a cellulose acetate in which the weight average polymerization degree is 120-330 and the degree of substitution of an acetyl group is 2.10-2.60; a (meth)acrylic polymer having a weight average molecular weight of 1000-30000; and a plasticizer.