How to optimize the dispersion of nanographene in polyester hot melt yarn?

How to optimize the dispersion of nanographene in polyester hot melt yarn?
Introduction
In today’s fiercely competitive global textile market, innovation and differentiation are the key to enterprises’ success. The rise of nanotechnology has brought unprecedented opportunities to the textile industry. Nanographene, as a nanomaterial with unique properties, is gradually being used in the production of polyester hot melt yarn. However, how to optimize the dispersion of nanographene in polyester hot melt yarn has become a difficult problem for many textile companies. This article will explore this issue in depth, aiming to provide valuable references and solutions for related companies and help them win more shares in the international market.

Importance of Nanographene in Polyester Hot Melt Wire
Nanographene has excellent mechanical properties, thermal conductivity and electrical properties. Applying it to polyester hot melt yarn can significantly improve the performance and added value of the product. For example, polyester hot melt yarn with nanographene added has excellent performance in strength, wear resistance, thermal conductivity, etc., which can meet the needs of high-end textiles, functional clothing and other fields. However, if nanographene is not evenly dispersed in polyester hot melt, it will not be able to fully exert its performance advantages, and may even affect the quality stability of the product.

Dispersion optimization method

Graphene pretreatment

Oxidation treatment

Oxidation treatment is an effective method to improve the dispersibility of nanographene in polyester hot melt. By treating graphene in a mixed acid of concentrated sulfuric acid and concentrated nitric acid, oxygen-containing functional groups such as carboxyl and hydroxyl groups are introduced to its surface. These functional groups can increase the polarity of the graphene surface, thereby improving its compatibility in the polyester matrix, which is conducive to the uniform dispersion of graphene. In addition, oxidation treatment can also change the interlayer spacing and structure of graphene, further promoting its dispersion in polyester hot melt.

Functionalization modification
In addition to oxidation treatment, functionalization modification of nanographene is also an important pretreatment method. For example, functionalization modification of graphene oxide with halogenated hydrocarbons can significantly improve the compatibility of graphene with polyester polyester. Functionally modified graphene can be more evenly dispersed in the polyester matrix, thereby improving the mechanical properties and functionality of the composite fiber. In addition, functional modification can also give graphene some special properties, such as antibacterial and antistatic properties, broadening the application field of polyester hot melt fibers.

Preparation process of composite system

Mixing process
When preparing nanographene/polyester composite system, choosing a suitable mixing process is crucial to the dispersibility of graphene. High-speed stirring is a commonly used mixing method. By stirring graphene and polyester raw materials at high temperature, graphene can be initially dispersed in the polyester matrix. However, simple high-speed stirring may not completely avoid the agglomeration of graphene. In order to further improve the dispersion effect, a twin-screw extruder can be used for mixing. The twin-screw extruder has strong shear force and mixing ability, which can fully disperse and deagglomerate graphene during the mixing process, so that it is evenly distributed in the polyester matrix.

Melt spinning process
Melt spinning is the key process for making nanographene/polyester composite system into hot melt fibers. In the melt spinning process, parameters such as temperature, pressure, and spinning speed have an important influence on the dispersibility of graphene. Appropriate spinning temperature can reduce the viscosity of polyester melt, making graphene easier to disperse in it. At the same time, appropriate spinning speed and draft multiple also contribute to the uniform distribution of graphene in the fiber. In addition, maintaining stable process parameters during the spinning process can avoid the problem of uneven dispersion of graphene due to parameter fluctuations.

Adding additives
In order to further optimize the dispersibility of nanographene in polyester hot melt, some additives can be added to the composite system. For example, adding a molecular weight regulator can control the viscosity of the polyester melt so that it is within a suitable range, which is conducive to the dispersion of graphene. In addition, additives such as antioxidants, anti-aging agents, and heat stabilizers can also be added to improve the comprehensive performance and stability of the composite fiber. These additives not only improve the fiber performance, but also help the uniform dispersion of graphene in the polyester matrix.

Actual application cases
In actual production, some companies have successfully developed high-performance composite fiber products by optimizing the dispersibility of nanographene in polyester hot melt. For example, a textile company used graphene oxide functionalized with halogenated hydrocarbons, combined with twin-screw extruder mixing and melt spinning processes, to prepare polyester hot melt yarn with a graphene content of 0.2%. After testing, the breaking strength of the hot melt yarn was more than 20% higher than that of ordinary polyester hot melt yarn, and it also had good antibacterial and antistatic properties. This successful case shows that through reasonable optimization measures, the dispersibility of nanographene in polyester hot melt yarn can be significantly improved, thereby enhancing the market competitiveness of the product.

Challenges and future prospects
Although some progress has been made in optimizing the dispersibility of nanographene in polyester hot melt yarn, there are still some challenges. For example, how to maintain uniform dispersion of graphene in large-scale production, how to further reduce production costs, etc. In the future, with the continuous development and innovation of nanotechnology, it is expected that more efficient dispersion technologies and processes will be developed to meet the market demand for high-performance polyester hot melt yarn. At the same time, strengthening the basic research on nanographene/polyester composite system and deeply understanding the dispersion mechanism and performance improvement principle of graphene in polyester matrix will also provide important theoretical support for optimizing dispersion.

Conclusion
Optimizing the dispersion of nanographene in polyester hot melt yarn is of great significance to improving product quality and performance. Through various measures such as graphene pretreatment, optimization of the preparation process of the composite system and addition of additives, the dispersion of graphene can be effectively improved, so as to give full play to its performance advantages in polyester hot melt yarn. In practical applications, enterprises should consider the applicability and economy of various optimization methods according to their own conditions and formulate reasonable production plans. At the same time, pay attention to industry development trends and technological innovation, and constantly explore new optimization methods to remain invincible in the fierce market competition.