A kind of preparation method and application of anhydrous calcium terephthalate whisker

Abstract

The invention discloses a preparation method and application of anhydrous calcium terephthalate whiskers. The preparation method of anhydrous calcium terephthalate whiskers includes the steps of subjecting ammonium terephthalate solution and calcium hydroxide slurry to reaction to obtain a precursor, and continuing the reaction at 120-150 DEG C in a high-pressure kettle for 1-6 h to obtain the anhydrous calcium terephthalate whiskers. The preparation method is green, low in cost and high in cleanliness level. The production process is free of three wastes, and the obtained anhydrous calcium terephthalate whiskers have large length-diameter ratio, high crystal strength and significant reinforcement effect. During the preparation of the calcium terephthalate whiskers from ammonium terephthalate and calcium hydroxide, isolated ammonia water may continue to dissolve terephthalic acid for next cycle or remaining water is also suitable for reuse after ammonia gas is recycled by means of ammonia steaming, and the whole process is free of three wastes and belongs to clean production.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a preparation method and application of anhydrous calcium terephthalate whiskers. Background technique [0002] Whiskers have a certain length-to-diameter ratio, generally the length-to-diameter ratio is greater than 10, and the cross-sectional area is less than 52×10 -5 cm 2 The single crystal fiber material has a fine diameter, almost no defects such as dislocations, cavities, impurities, and particle interfaces contained in common materials, and has complete crystallization and orderly arrangement, so its strength is close to the theoretical limit of atomic bonding. The strength of whiskers far exceeds that of ordinary fiber materials, and it is a reinforcing agent for new composite materials with excellent mechanical properties. At present, it is mainly used in the reinforcement of ceramic matrix composite materials, metal matrix composite materials and resin matrix composite mater...

AI Technical Summary

Problems solved by technology

The preparation method of whisker-shaped calcium terephthalate has been reported in Chinese patent CN 103173845B and CN102583813B, all is to add thick terephthalic acid to caustic soda solution and dissolve, adjust pH, add polyethylene glycol nonionic surfactant, stir Mix well, then add soluble calcium salt, stir, and age for a certain period of time to obtain calcium terephthalate whiskers. This method is simple and easy, but the filtrate after separating the calcium terephthalate whiskers is a sodium salt solution. It cannot be recycled in this system, and direct discharge will pollute the environment

[0004] At present, there is a lack of a clean preparation process for terephthalic acid whiskers. Not only does the whole production process produce no three wastes, but the obtained whiskers have a significant reinforcing performance on polymer materials.

Images