Magnesium-light rare earth hydrotalcite composite heat stabilizer and preparation method thereof
A composite heat stabilizer and light rare earth technology, which is applied in the field of polyvinyl chloride molding and processing, can solve the problems of poor performance, only applicable composite heat stabilizers, and short static heat stabilization time, and achieves inhibition of initial coloration and high industrial application. Value, Torque Moderate Effect
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[0024] The preparation method of the magnesium-light rare earth hydrotalcite composite thermal stabilizer according to the second aspect of the present invention is used to prepare the magnesium-light rare earth hydrotalcite composite thermal stabilizer described in the first aspect of the present invention, comprising steps: (1 ) Dissolve magnesium salt and light rare earth salt in the deCO2 2 The first solution was obtained in deionized water, and at the same time sodium hydroxide and organic carboxylic acid were dissolved in deCO 2 The second solution is obtained in the mixed solution of deionized water and ethanol, wherein, n(NaOH) / [n(Mg 2+ )+n(RE 3+ )]=2, n(organic carboxylic acid) / n(RE 3+ )=2, n is the amount of substance, RE is light rare earth; (2) in N 2 Under protection, drop the first solution into the three-necked flask pre-installed with the second solution, the reaction temperature is 75°C-95°C, stir, and keep the pH of the reaction solution at 9-12. Reflux a...
Embodiment 1
[0031] Weigh 23.1g Mg(NO 3 ) 2 ·6H 2 O and 13.0g La(NO 3 ) 3 ·6H 2 O dissolves in deCO 2 Obtain the first solution in deionized water, weigh 9.6g NaOH and 17.1g stearic acid (C 18 h 36 o 2 ) dissolved in deCO 2 Obtain the second solution in the mixed solution of deionized water and ethanol;
[0032] in N 2 Under protection, slowly drop the first solution into the three-necked flask pre-installed with the second solution, the reaction temperature is 85°C, stir vigorously, keep the pH of the reaction solution at 9-12, after the dropwise addition, reflux at 85°C for 8h , and then aging the reaction solution at 100° C. for 12 hours, filtering, washing, drying, and grinding to obtain stearic acid intercalated magnesium-lanthanum hydrotalcite;
[0033] In terms of parts by mass, 25 parts of stearic acid intercalated magnesium-lanthanum hydrotalcite, 25 parts of zinc stearate and 30 parts of pentaerythritol were pre-mixed and ground, and mechanically stirred at 80°C for 3 ...
Embodiment 2
[0035] Weigh 27.7g Mg(NO 3 ) 2 ·6H 2 O and 25.6 g CeCl 3 ·6H 2 O dissolves in deCO 2 Obtain the first solution in deionized water, take by weighing 14.4g NaOH and 32.8g myristic acid (C 14 h 28 o 2 ) dissolved in deCO 2 Obtain the second solution in the mixed solution of deionized water and ethanol;
[0036] in N 2 Under protection, slowly drop the first solution into the three-necked flask pre-installed with the second solution, the reaction temperature is 75°C, stir vigorously, keep the pH of the reaction solution at 9-12, after the dropwise addition, reflux at 75°C for 7h , then aging the reaction solution at 100°C for 12 hours, filtering, washing, drying, and grinding to obtain a myristic acid intercalated magnesium-cerium hydrotalcite heat stabilizer;
[0037] In terms of parts by mass, take 15 parts of myristic acid intercalated magnesium-cerium hydrotalcites, 15 parts of stearic acid intercalated magnesium-lanthanum hydrotalcites (prepared according to the met...
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