Method for evaluating rare earth isoprene rubber production materials by bottle polymerization with neodymium n-valerate
A technology of rare earth isoprene rubber and neodymium n-valerate, which is applied in the preparation of organic compounds, chemical instruments and methods, and preparation of carboxylate, which can solve the problems that dissolved oxygen is not suitable for removal, oxygen content is difficult to measure, and is difficult to take. , to achieve the effect of great market promotion and application value, stable quality, convenient storage, transportation and use
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Embodiment 1
[0029] A. Synthesis of neodymium n-valerate
[0030] Under normal temperature and stirring state, add 1.0g n-valeric acid into 99mL deionized water to prepare n-valeric acid aqueous solution, then add 1.3g 30% sodium hydroxide aqueous solution, then add 2.7g 30% neodymium chloride aqueous solution, use pH The pH of the reaction product was measured by test paper to be 5. After stirring and reacting for 30 minutes, the generated neodymium n-valerate was precipitated and filtered, and the filter cake was washed twice with deionized water. Dry 2h in oven, be ground into powder, then dry 2h, product weighs 1.31g, records moisture with Karl Fischer moisture analyzer and is 1.0%, records neodymium element content with EDTA complexometric titration method and is 0.00221g / mol, And sealed and stored in a glass desiccator for later use.
[0031] B. Bottle polymerization evaluation
[0032] Draw 10mL of triisobutylaluminum (2mol / L) and 2mL of diethylaluminum chloride (2mol / L) into an a...
Embodiment 2
[0037] A. Synthesis of neodymium n-valerate
[0038] Under normal temperature and stirring state, add 3.0g n-valeric acid into 97mL deionized water to prepare n-valeric acid aqueous solution, then add 2.93g 40% sodium hydroxide aqueous solution, then add 5.8g 40% neodymium chloride aqueous solution, use pH The PH value of the reaction product measured by the test paper is 7. After stirring and reacting for 30 minutes, the generated neodymium n-valerate is precipitated and filtered, and the filter cake is washed twice with deionized water. Dry in a vacuum oven for 2h, then grind into powder, then dry for 2h, the product weighs 3.90g, the moisture is 2.0% as measured by the Karl Fischer moisture analyzer, and the neodymium element content is 0.00225g / mol as measured by the EDTA complexometric titration method , and sealed and stored in a glass desiccator for later use.
[0039] B. Bottle polymerization evaluation
[0040] Draw 9mL of triisobutylaluminum (2mol / L) and 3mL of die...
Embodiment 3
[0045] A. Synthesis of neodymium n-valerate
[0046] Under normal temperature and stirring state, add 2.0g n-valeric acid into 98mL deionized water to prepare n-valeric acid aqueous solution, then add 2.24g 35% sodium hydroxide aqueous solution, then add 4.60g 35% neodymium chloride aqueous solution, use pH The pH of the reaction product was measured by test paper to be 6. After stirring and reacting for 30 minutes, the resulting neodymium n-valerate was precipitated and filtered, and the filter cake was washed twice with deionized water. Dry it in an oven for 2 hours, grind it into powder, and dry it for another 2 hours. The product weighs 2.72g, and the moisture is 1.5% as measured by Karl Fischer moisture analyzer, and the content of neodymium element is 0.00223g / mol as measured by EDTA complexometric titration, and is sealed and stored in a glass desiccator for subsequent use.
[0047] B. Bottle polymerization evaluation
[0048] Draw 10mL of triisobutylaluminum (2mol / L)...
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