Polytrimethylene Terephthalate Composition Stabilizing Melt-Spinning
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Solution Overview
Problem
Polytrimethylene terephthalate fibers face issues with fluffing, yarn breakage, and quality deterioration due to the addition of titanium dioxide, which affects the stability and thermal stability of the fiber production process, especially in producing fibers with small single-fiber fineness.
Innovation Solution
A polytrimethylene terephthalate composition with intrinsic viscosity between 0.50 to 1.60 dL/g, containing 0.05 to 3.0% by weight of titanium dioxide particles larger than 1.0 μm, and a crystallization exothermic peak top temperature of 165°C or more, along with a half-width of 20°C or less, is developed, using a wet-grinding treatment and organic titanium compounds to stabilize the melt-spinning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If titanium dioxide is added to polytrimethylene terephthalate to suppress fiber luster, then the delustering effect is improved, but the polyester polymer is decomposed due to surface activity of inorganic particles, resulting in decreased molecular weight and fiber breakage
Solution Approach 1:
The patent introduces a surface treatment layer on titanium dioxide particles that acts as an intermediary between the inorganic particles and the polyester polymer. This surface treatment suppresses the surface activity of titanium dioxide, preventing polymer decomposition while maintaining the delustering effect. The surface treatment serves as a mediator that allows coexistence of titanium dioxide addition and process stability.
Solution Approach 2:
The patent changes the surface properties of titanium dioxide particles through surface treatment, altering their interaction with the polyester polymer. By modifying the surface activity parameter of titanium dioxide, the patent prevents harmful interactions that would otherwise cause polymer decomposition and fiber breakage, while preserving the desired delustering functionality.
2Illumination intensity
If titanium dioxide is added to polytrimethylene terephthalate, then the delustering effect is improved, but fluffing and hue variation occur due to lower thermal stability of polytrimethylene terephthalate
Solution Approach 1:
The surface treatment on titanium dioxide particles serves as a protective intermediary that prevents direct harmful interactions with the polytrimethylene terephthalate polymer. This treatment suppresses surface activity that would otherwise cause fluffing and hue variation, allowing the delustering effect to be achieved without compromising fiber quality.
Solution Approach 2:
The surface treatment is applied beforehand to titanium dioxide particles before they are introduced to the polyester system. This pre-treatment cushions against potential harmful effects during the fiber production process, preventing fluffing and hue variation before they can occur.
3Reliability
If removal operations such as centrifugation or filtration are performed to reduce titanium oxide aggregates, then filter clogging is reduced, but the methods are insufficient for producing high-quality small-fineness fibers with less fluffing
Solution Approach 1:
Instead of removing titanium dioxide particles, the patent changes their surface properties through treatment. This parameter change allows the particles to be retained in the system without causing harm, enabling production of high-quality small-fineness fibers with reduced fluffing while maintaining filter stability.
Solution Approach 2:
The patent converts the potentially harmful surface activity of titanium dioxide into a beneficial controlled interaction through surface treatment. Rather than removing the particles, the treatment allows them to function as delustering agents while preventing the harmful effects that would cause fluffing and fiber breakage in small-fineness fibers.
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 solution significantly reduces fluffing and yarn breakage, stabilizes the fiber production process, and improves the quality of fibers with small single-finer fineness, maintaining tensile strength and elongation values.
Implementation Method 1
the crystallization exothermic peak top temperature that appears when the polytrimethylene terephthalate composition heated to the melting point or higher is cooled
Data Source
AI summary
A polytrimethylene terephthalate composition including a polyester having a trimethylene terephthalate unit as a main repeating unit, which satisfies all the following requirements: (a) the intrinsic viscosity is 0.50 to 1.60 dL/g; (b) titanium dioxide whose weight distribution of particles having a particle size of more than 1.0 μm is 5.0% by weight or less is contained in an amount of 0.05 to 3.0% by weight; (c) the crystallization exothermic peak top temperature is 165° C. or more; and (d) the half-width of the crystallization exothermic peak is 20° C. or less. In addition, the invention further encompasses a method for producing a polytrimethylene terephthalate composition using titanium dioxide that has been subjected to a wet-grinding treatment, and also a fiber obtained from the composition. The invention provides a polytrimethylene terephthalate composition, which stabilizes the process in the production of a fiber having small single-fiber fineness by melt-spinning, and is suitable for obtaining a fiber with reduced fluffing.