Method for preparing high-strength polyethene continuous fibers and product prepared by the method

Abstract

Abstract The invention discloses a method for preparing a high-strength polyethylene continuous fiber, comprising the steps of: (a) placing a linear polyethylene powder into a solvent of paraffin, and extruding the dissolved solution through a spinneret after deaeration at high temperature, and then cooling the extruded solution to further form an as-spun gel filament; (b) placing the as-spun gel filament into a vacuum environment with the temperature of 40*C-120'C and keeping it on standing, wherein the standing time is 3-84 hours; (c) extracting the gel filament by a multi-stage process; (d) drying the fiber after extraction; (e) taking the dried fiber into a multi-drawing process. The invention also discloses a product made according to the above method for preparing a high-strength polyethylene continuous fiber. In the method for preparing a high-strength polyethylene continuous fiber according to the invention, the standing time is shortened by employing the above technical solution, and the as-spun gel filament is placed on standing in a vacuum environment with a temperature over room temperature, in order to facilitate the phase separation of the gel filament, as well as a large amount of solvent is separated out, thereby decreasing the amount of extractant used.

Description

technical field [0001] The invention relates to a preparation method of high-strength polyethylene continuous fiber and the obtained product. Background technique [0002] The high-strength polyethylene fiber prepared by gel-spinning super-stretching technology has the highest tensile strength and tensile modulus among flexible chain polymer materials, and is the first choice for making high-strength ropes, high-strength textiles, body armor, and bulletproof armor Material. [0003] The existing high-strength polyethylene fibers are prepared by solvent spinning and high-strength drawing technology, and the following two methods can be divided according to the difference of solvents: [0004] (1) Use decahydronaphthalene, a polyethylene solvent with better volatility, to dissolve polyethylene with ultra-high molecular weight in decahydronaphthalene. Decalin is relatively easy to volatilize. The heated hot air flow is used to take out and volatilize the decahydronaphthalene ...

AI Technical Summary

Problems solved by technology

The feature of this method is that the process is relatively simple, and only one solvent, decahydronaphthalene, is needed in the production process. However, this method also has significant defects. The concentration of the spinning solution is limited to a certain extent. When the concentration is too high, a relatively high dissolution temperature is often required to complete the dissolution, and increasing the temperature will intensify the volatilization of decahydronaphthalene. Therefore, the solution concentration in actual use is generally limited to below 8%. , Secondly, due to the high volatility of decahydronaphthalene, it is difficult to recover gasified decahydronaphthalene, and the production often puts a lot of pressure on the environment, and the cost is relatively high