Preparation method and application of anhydrous calcium terephthalate whiskers
A technology of calcium terephthalate and ammonium terephthalate, applied in the field of chemistry, can solve the problems of obvious reinforcing properties of polymer materials, lack of terephthalic acid whiskers, and cannot be recycled, and achieves a remarkable reinforcing effect. , huge potential economic benefits, the effect of reducing environmental protection costs
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Embodiment 1
[0020] A method for preparing anhydrous calcium terephthalate whiskers of the present invention comprises the following steps: the precursor obtained by reacting ammonium terephthalate solution and calcium hydroxide slurry is continued in an autoclave at 120°C After reacting for 2 hours, anhydrous calcium terephthalate whiskers were obtained. The obtained anhydrous calcium terephthalate whiskers can be added to polymer materials as a reinforcing agent to prepare composite materials with high strength and high modulus.
[0021] The preparation method of the precursor is to slowly add the calcium hydroxide slurry to the ammonium terephthalate solution under constant stirring, and then continue the reaction for 5 minutes.
[0022] The mass percent concentration of the ammonium terephthalate solution is 2%. The ammonium terephthalate solution is prepared by dissolving terephthalic acid in ammonia solution, or directly dissolving commercially available ammonium terephthalate solid...
Embodiment 2
[0031] The difference between Example 2 and Example 1 is that a method for preparing anhydrous calcium terephthalate whiskers of the present invention comprises the following steps: the precursor obtained by reacting ammonium terephthalate solution and calcium hydroxide slurry , continue the reaction in an autoclave at 140° C. for 4 hours to obtain anhydrous calcium terephthalate whiskers. The obtained anhydrous calcium terephthalate whiskers can be added to polymer materials as a reinforcing agent to prepare composite materials with high strength and high modulus.
[0032] The mass percent concentration of the ammonium terephthalate solution is 10%. The ammonium terephthalate solution is prepared by dissolving terephthalic acid in ammonia solution, or directly dissolving commercially available ammonium terephthalate solid in water, and its mass percent concentration is 10%.
[0033] The calcium hydroxide slurry is obtained by dissolving and dispersing solid calcium hydroxide...
Embodiment 3
[0036] The difference between Example 3 and Example 1 is that a method for preparing anhydrous calcium terephthalate whiskers of the present invention comprises the following steps: the precursor obtained by reacting ammonium terephthalate solution and calcium hydroxide slurry , continue the reaction in an autoclave at 150° C. for 6 h to obtain anhydrous calcium terephthalate whiskers.
[0037] The mass percent concentration of the ammonium terephthalate solution is 15%. The ammonium terephthalate solution is prepared by dissolving terephthalic acid in ammonia solution, or directly dissolving commercially available ammonium terephthalate solid in water, and its mass percent concentration is 15%.
[0038]The calcium hydroxide slurry is obtained by dissolving and dispersing solid calcium hydroxide in hot water at 90° C., and the mass percent concentration of the calcium hydroxide slurry is 25%.
[0039] The reaction molar ratio of the calcium hydroxide to the ammonium terephtha...
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