Polyester Crystallinity Control for Fine Particle Processing
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Solution Overview
Problem
Current methods for processing polyalkylene benzenedicarboxylate materials, such as PET, are inefficient and energy-consuming, requiring complex equipment and high temperatures, and often result in unsatisfactory particle size and crystallinity, as well as environmental concerns due to the use of solvents.
Innovation Solution
A method involving an immersion treatment with ethylene glycol to enhance crystallinity, followed by a disintegration treatment, such as impact fracturing, to produce polyester materials with improved size and crystallinity, and a decolorization treatment to remove colorants, reducing energy consumption and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional crushing or grinding methods are used to reduce PET particle size, then particle size is reduced to millimeter scale, but the process requires complicated equipment and consumes large amounts of liquid nitrogen to achieve micrometer scale
Solution Approach 1:
The patent changes the physical-chemical parameters of PET by controlling crystallinity through heating to specific temperature ranges (150-200°C) for predetermined times, transforming the material from amorphous to crystalline state, which enables easy comminution to fine particles without complex equipment or liquid nitrogen
Solution Approach 2:
The patent utilizes phase transition of PET from amorphous to crystalline state through controlled heating and cooling processes. The crystallization process occurs at specific temperature ranges, changing the material's mechanical properties to enable fine particle production through simple comminution rather than complex crushing equipment
2Stability of the object's composition
If high temperature heating is applied to increase crystallinity of PET flakes, then crystallinity is improved, but energy consumption increases and processing time is extended
Solution Approach 1:
The patent optimizes heating parameters by controlling temperature within 150-200°C range and predetermined time periods, achieving sufficient crystallinity enhancement without excessive energy input. This parameter optimization balances crystallinity improvement with energy consumption reduction
Solution Approach 2:
The patent applies partial heating action at controlled temperatures rather than excessive high-temperature processing. By applying heat selectively within the optimal range for a predetermined time, the patent achieves sufficient crystallinity without the energy waste of prolonged or excessive heating
3Stability of the object's composition
If high temperature heating is applied to increase crystallinity of PET flakes, then crystallinity is improved, but the quality of PET flakes deteriorates due to side reactions
Solution Approach 1:
The patent carefully controls heating parameters within 150-200°C and predetermined time ranges to achieve crystallinity enhancement while preventing side reactions. This parameter control ensures that the PET flakes maintain their original quality and properties without degradation from excessive heat treatment
4Manufacturing precision
If organic solvents are used to dissolve PET bottle flakes, then particle size is reduced to micrometer scale, but processing cost increases and environmental friendliness decreases
Solution Approach 1:
The patent replaces the chemical dissolution method using organic solvents with a physical-chemical method involving controlled heating and crystallization. This substitution eliminates the need for harmful organic solvents, reducing environmental impact while still achieving fine particle production through subsequent comminution
Solution Approach 2:
The patent changes the processing approach from chemical dissolution to physical-chemical crystallization control. By controlling temperature and time parameters during heating, the patent achieves material transformation that enables fine particle production without requiring organic solvents, thereby eliminating environmental hazards
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 method effectively produces polyester materials with higher crystallinity and smaller particle sizes, achieving efficient disintegration and decolorization, while reducing energy consumption and processing time compared to existing methods.
Implementation Method 1
subjecting a polyalkylene benzenedicarboxylate material to an immersion treatment with an immersion liquid including ethylene glycol, so as to obtain an immersed polyester material, the immersed polyester material having crystallinity higher than that of the polyalkylene benzenedicarboxylate material
Implementation Method 2
subjecting the immersed polyester material to a disintegration treatment to obtain a disintegrated polyester material
Data Source
AI summary
A method for processing a polyalkylene benzenedicarboxylate material includes subjecting a polyalkylene benzenedicarboxylate material to an immersion treatment with an immersion liquid including ethylene glycol, so as to obtain an immersed polyester material, and subjecting the immersed polyester material to a disintegration treatment to obtain a disintegrated polyester material. The immersed polyester material has crystallinity higher than that of the polyalkylene benzenedicarboxylate material.