Preparation method for heat-resisting polylactic acid fiber

Abstract

The invention relates to a preparation method for a heat-resisting polylactic acid fiber, which comprises the following steps: drying polylactic acid grains in a vacuum drum; modifying the surface of nanometer silicon dioxide by using a silane coupling agent, namely, gamma-aminopropyl triethoxy silane; mixing the dry polylactic acid grains with the modified nanometer silicon dioxide; preparing into polylactic acid plus silicon dioxide master batches by utilizing a double-screw extruding machine; uniformly mixing the master batches and the polylactic acid grains at weight ratio; pouring the mixture into a melt spinning machine for spinning; and drafting through two areas, thereby obtaining polylactic acid plus silicon dioxide fibers. The process of the preparation method is advanced; the data is full and accurate; the preparation method is suitable for mass production; the prepared polylactic acid filament is excellent in heat resistance and mechanical property; the problem of poor heat resistance of the polylactic acid fiber is effectively solved; and the application scope of the polylactic acid fiber is widened.

Description

Technical field: [0001] The invention relates to a method for preparing heat-resistant polylactic acid fibers, which belongs to the technical field of preparation and application of functionalized polylactic acid fibers. Background technique: [0002] Polylactic acid fiber, referred to as PLA fiber, is a fiber material made from renewable corn and other grains through fermentation, polymerization, and spinning. The source of corn and other raw materials can be regenerated, overcoming synthetic fibers such as polyester, Nylon depends on the shortcomings of petroleum; moreover, the waste of polylactic acid fiber can be completely decomposed into water and carbon dioxide in water or soil, and will not pollute the environment. It is an environmentally friendly material that solves the problem of synthetic fibers that are difficult to degrade question. [0003] There is a serious problem in the application process of polylactic acid fiber and its textiles. Although it can be u...

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Problems solved by technology

[0003]There is a serious problem in the application process of polylactic acid fiber and its textiles. Although it can be used normally at room temperature, once the ambient temperature rises, it will exceed the temperature of PLA. After the glass transition temperature Tg≈57°C, the mechanical properties such as tensile strength of PLA fiber and its products will drop sharply, and it will be deformed and sticky, which limits the scope of application; in addition, poor heat resistance will also cause molding problems, such as PLA filament non-woven fabrics are made into carpets by thermoforming. When the forming temperature is 130-140 ° C, the non-woven fabrics are not easy to form due to the decrease in strength and extensibility, and problems such as deep extrusion and partial rupture often occur; due to poor heat resistance, Polylactic acid fibers and fabrics cannot be dyed by conventional high-temperature dyeing methods and high-temperature ironing

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