Preparation method of environment-friendly high-strength high-modulus polyethylene fibers

Abstract

The invention relates to a preparation method of environment-friendly high-strength high-modulus polyethylene fibers. The preparation method comprises the following steps: mixing ultrahigh molecular weight polyethylene and decahydronaphthalene at a certain ratio to prepare spinning solution, enabling the spinning solution to enter a twin-screw extruder and a spinning box after swelling, entering acalorstat after extruding by a spinneret plate, entering a multistage hot roller drying device after shaping by cooling of a cold roller in the calorstat and finally dragging a hot roller for ultra-drawing and rolling up for shaping. The strength of the prepared fibers can reach above 40 cN / dtex, and the modulus is above 1,800 cN / dtex; compared with the traditional spinning method, the preparation method has the characteristics of being short in process, low in energy consumption, environmentally friendly, free of secondary solvent introduced into aftertreatment, uniform in fiber number and so on; the prepared fibers can be used for preparing body armors, bullet proof helmets, protective armors, high-strength marine cables, anti-cutting gloves, summer sleeping mats, arm guards and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer material processing and preparation, and in particular relates to a preparation method of an environment-friendly high-strength and high-modulus polyethylene fiber. Background technique [0002] UHMWPE fiber was first successfully developed by Capaccio and Ward of the University of Leeds in the 1970s, when the molecular weight of polyethylene used was only 100,000. Obtained the first patent on UHMWPE fiber gel spinning technology. Afterwards, the Dutch DSM company used decahydro as a solvent, invented the gel spinning method, and prepared ultra-high molecular weight polyethylene fibers; in 1984, it began to jointly build a 50t / month China The pilot plant, the fiber trade name is DyneemaSK-60; in 1990, industrial production was realized in a factory in Heerlem, the country. Then in 1986, American Allied Company (now Honeywell Company) purchased the patent right to use DSM and started the industri...

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Problems solved by technology

[0003] Chinese patent 201610838145.8 discloses a method for preparing ultra-high molecular weight polyethylene fibers and the prepared ultra-high molecular weight polyethylene fibers. The invention selects ultra-high molecular weight polyethylene powder and adds solvent oil, antioxidants and modified The spinning solution is sent to a twin-screw extruder for blending and extrusion, the spinning solution is sent to a filter, and passed through a metering pump, extruded through a spinneret, sequentially extracted, dried, and grade drafting, the invention uses white oil as solvent oil, and an extraction process is also required in the production process. The extraction agent used in this process pollutes the environment seriously and consumes a lot, which is not conducive to the development of green spinning industry

[0004] Chinese patent 201511022257.8 discloses an ultra-high molecular weight polyethylene fiber and its preparation method. The process adopts the traditional wet spinning process, including placing the ultra-high molecular weight polyethylene as-spun yarn after extracting the solvent in a radiation-sensitive cross-linking agent. The impregnation treatment is carried out in the modified solution, and the as-spun silk after the impregnation is dried, multi-stage hot air drawing and other processes. In this process, an extractant is used to remove the solvent in the fiber, and radiation crosslinking is used to improve the creep performance of the fiber. The whole The extraction agent and radiation used in the process are relatively harmful to the environment, and more new environmental pollutants are introduced, and the post-processing is complicated, which is not conducive to sustainable development

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