Preparation method of curcumin rare earth complex, composite heat stabilizer for rigid PVC (polyvinyl chloride) and preparation method of composite heat stabilizer

A technology of composite thermal stabilizer and rare earth complexes, which is applied in the fields of compounds containing Group 3/13 elements of the periodic table, chemical instruments and methods, organic chemistry, etc. problems, to achieve the effects of excellent rheological properties and mechanical properties, excellent thermal stability during processing, and rich sources of raw materials

Active Publication Date: 2015-09-09
TANGSHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But curcumin is unstable in alkaline system, especially, curcumin rare earth complex prepared under the condition of weak alkaline system or with weak alkaline reagent has poor processing heat stability to PVC

Method used

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  • Preparation method of curcumin rare earth complex, composite heat stabilizer for rigid PVC (polyvinyl chloride) and preparation method of composite heat stabilizer
  • Preparation method of curcumin rare earth complex, composite heat stabilizer for rigid PVC (polyvinyl chloride) and preparation method of composite heat stabilizer

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preparation example Construction

[0014] According to the preparation method of the curcumin rare earth complex of the first aspect of the present invention, comprise steps: (1) curcumin and dehydrated alcohol are added in the flask, heat and stir until curcumin dissolves completely; (2) drip in the flask Add rare earth nitrate solution, and then adjust the pH value of the solution to 6.0±0.2; (3) continue to stir and reflux, after the reaction is over, cool the reaction solution to room temperature, and filter with suction, then use the precipitate obtained by suction filtration Washing with absolute ethanol, suction filtration, and vacuum drying to obtain the curcumin rare earth complex.

[0015] In the preparation method of the curcumin rare earth complex according to the first aspect of the present invention, the curcumin rare earth complex is prepared under the condition of weak acidity and no weak base reagent, so its structure is stable.

[0016] In the preparation method of the curcumin rare earth comp...

Embodiment 1

[0030] 1. Preparation of Curcumin Rare Earth Complexes

[0031] Add 10g of curcumin and 80mL of absolute ethanol into a 250mL flask, stir in a water bath at 40°C until the curcumin is completely dissolved; then, add 100mL of rare earth lanthanum nitrate solution with a concentration of 0.1mol / L to the flask dropwise, and use phosphoric acid Salt buffer solution to adjust the pH of the solution to 6.0±0.2; then continue to stir and reflux for 2.5 to 4 hours. After the reaction is completed, cool the reaction solution to room temperature and filter with suction, and then wash the precipitate obtained by suction with absolute ethanol. After suction filtration and vacuum drying, curcumin lanthanum complex is obtained.

[0032] Among them, curcumin lanthanum complex, 1H NMR (300MHz, DMSO) δ (ppm): 3.84 (s, 6H, OCH 3 ), 6.06 (s, 1H, CH), 6.74-6.83 (d, 4H, =CH), 7.15-7.56 (m, 6H, Ar-H), 9.65 (s, 2H, Ar-OH). IR (KBr pellet, cm -1 )ν: 3071, 3016, 2972, 2944, 2848, 1628, 1603, 1510cm...

Embodiment 2

[0036] Prepare rigid PVC composite heat stabilizer according to the method of embodiment 1, except following differences:

[0037] 1. Preparation of Curcumin Rare Earth Complexes

[0038] Change rare earth lanthanum nitrate to rare earth neodymium nitrate, wherein, curcumin neodymium complex, 1 H NMR (300MHz, DMSO) δ (ppm): 3.84 (s, 6H, OCH 3 ), 6.06 (s, 1H, CH), 6.74-6.84 (d, 4H, =CH), 7.15-7.57 (m, 6H, Ar-H), 9.66 (s, 2H, Ar-OH). IR (KBr pellet, cm -1 )ν: 3071, 3015, 2971, 2944, 2843, 1628, 1602, 1510cm -1 .

[0039] 2. Preparation of composite heat stabilizer for rigid PVC

[0040] In parts by weight, 100 parts of curcumin neodymium complex, 10 parts of antioxidant 1010, 10 parts of glyceryl monostearate, and 15 parts of glyceryl tristearate were pre-mixed uniformly, then heated to 45°C and Stir and mix at high speed for 15 minutes at a spindle speed of 1100 rpm; then add 25 parts of calcium stearate and 10 parts of zinc stearate, raise the temperature to 75°C and mix a...

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Abstract

The invention provides a preparation method of a curcumin rare earth complex, a composite heat stabilizer for rigid PVC (polyvinyl chloride) and a preparation method of the composite heat stabilizer. The preparation method of the curcumin rare earth complex comprises steps as follows: curcumin and absolute ethyl alcohol are added to a flask and heated until curcumin is dissolved completely; a rare earth nitrate solution is dropwise added to the flask, and the pH value is regulated to 6.0 plus or minus 0.2; the mixture is continuously stirred and flows back, after the reaction is finished, the mixture is cooled to the room temperature and is subjected to extraction filtration, precipitates obtained through extraction filtration are washed with absolute ethyl alcohol and subjected to extraction filtration and vacuum drying, and the curcumin rare earth complex is obtained. The composite heat stabilizer for rigid PVC comprises components in parts by weight as follows: 100 parts of the curcumin rare earth complex, 0-20 parts of an antioxidant 1010, 5-20 parts of glyceryl monostearate, 5-20 parts of glyceryl tristearate, 15-50 parts of calcium stearate and 5-10 parts of zinc stearate. The composite heat stabilizer for rigid PVC has excellent heat stabilizing effect on processing of a PVC product, and meanwhile, the PVC product has excellent rheological properties and mechanical properties.

Description

technical field [0001] The invention relates to the field of polyvinyl chloride (PVC) molding processing, in particular to a preparation method of a curcumin rare earth complex, a composite heat stabilizer for rigid PVC and a preparation method thereof. Background technique [0002] Curcumin is derived from the herb Curcuma longa of the Zingiberaceae family. Its molecular structure has two structural units, phenolic hydroxyl and β-diketone, which can easily capture free radicals in the system and exhibit excellent antioxidant effects. At the same time, the isomerization transformation between the keto-enol structure of β-diketone gives curcumin a unique coordination ability. Rare earth ions have larger ionic radii and more empty electron energy levels, and can form rare earth complexes with organic ligands through coordination bonds. Researches at home and abroad have confirmed that curcumin rare earth complexes are safe, non-toxic, non-polluting to the environment, and hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/00C07C49/255C08K5/132C08L27/06
Inventor 李德玲李光辉张宁于静王光荣
Owner TANGSHAN NORMAL UNIV
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