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Rare earth complex and preparation method and application thereof

A technology of rare earth complexes and rare earth salts is applied in the field of rubber additives to achieve the effects of improving heat resistance, promoting vulcanization and low cost

Inactive Publication Date: 2010-07-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on rare earth organic complexes as rubber antioxidants has not been reported in the literature.

Method used

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  • Rare earth complex and preparation method and application thereof
  • Rare earth complex and preparation method and application thereof
  • Rare earth complex and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 22.5g (0.15mol) 2-mercaptobenzimidazole (MB) was dissolved in 200ml ethanol-water solution, and 150ml 0.33mol / l europium chloride (EuCl 3 ·6H 2 O 0.05mol) ethanol solution, stirred and reacted at 70°C for 1 hour. The precipitate generated by the reaction was filtered, washed with 1:1 ethanol-acetone solution until no chloride ions were found in the filtrate with acidified silver nitrate solution, and then dried in a vacuum oven to constant weight to obtain a light yellow powder product. Yield: 92%. Elemental analysis: the Eu, C, H, N, and S contents of the product are 30.01%, 33.11%, 2.80%, 11.08%, and 12.23%, respectively, and the chemical formula Eu(MB) 2 (OH)·2H 2 O match. Infrared spectroscopy (FTIR) analysis results are as follows figure 1 shown. Among them, the complex is at 1464cm -1 and 645cm -1 The nearby absorption peaks are the resonance absorption peak N=C-S of the exocyclic sulfur atom and the imidazole ring and the C-S stretching vibration absorpti...

Embodiment 2

[0025] Dissolve 9.84g (0.06mol) of 2-mercaptomethylbenzimidazole (MMB) in 100ml of ethanol-water solution, slowly add 100ml of 0.2mol / l samarium chloride (SmCl 3 ·6H 2 (0.02mol) ethanol solution, stirred and reacted at 20°C for 5 hours. The precipitate formed by the reaction was filtered under reduced pressure, washed with 1:1 ethanol-acetone solution until the filtrate was tested with acidified silver nitrate solution to detect no chloride ions, and then dried in a vacuum oven to constant weight to obtain a light yellow powder product. Yield: 89%. Elemental analysis: the Sm, C, H, N, and S contents of the product are 28.01%, 36.13%, 3.80%, 10.08%, and 12.03%, respectively, and the chemical formula Sm(MMB) 2 (OH)·2H 2 O match. FTIR: The characteristic absorption peak of the organic segment of the complex is basically consistent with the spectrum of the ligand MMB, where the complex is at 1466 and 660cm -1 The nearby absorption peaks are the resonance absorption peak N=C-S...

Embodiment 3

[0027] With 2-mercaptobenzimidazole as a ligand and rare earth lanthanum as a central ion, the lanthanum complex of 2-mercaptobenzimidazole is prepared according to the above steps, and the structural formula is La(MB) 2 (OH)·H 2 O, denoted as La-MB.

[0028] Rare earth complex anti-aging performance test basic formula: natural rubber 100; zinc oxide 3; stearic acid 2; accelerator CZ 1.5; accelerator DM 0.5; sulfur 1.5; antioxidant La-MB or 4010NA2.

[0029] Mixing and vulcanization process: First pass the natural rubber on the φ160 open mill for 6 times (roll distance 0.5mm). Add the rare earth organic complex and other compounding ingredients according to the conventional mixing method, and add sulfur at the end. The rubber is vulcanized on a flat vulcanizer at 143°C and 15MPa, and the positive vulcanization time T90 is measured by a vulcanizer. The vulcanized samples were placed at room temperature for 24 hours, and then tested for physical and mechanical properties.

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Abstract

The invention relates to a novel rare earth complex, which consists of rare earth ions and organic ligands with the anti-aging effect, wherein the rare earth ions are ions made of one or the mixture of more than one of 14 rare earth elements with the atomic numbers of 57-71 in the periodic table of elements; and the rare earth complex is prepared by the method that 2-mercapto benzimidazole or derivant thereof and soluble rare earth salt with stoichiometric ratio are reacted in a lower alcohol or lower alcohol-water medium, filtered, washed and dried. The rare earth complex has good anti-aging effect on natural rubber and various synthetic rubbers.

Description

technical field [0001] The invention belongs to the technical field of rubber additives, and in particular relates to a rare earth complex having the function of a rubber anti-aging agent, a preparation method and application thereof. Background technique [0002] During the processing, storage and use of rubber, due to the influence of various factors, its structure changes and gradually loses its original excellent properties. This phenomenon is called rubber aging. The substance that can prevent or delay the aging of rubber is called anti-aging agent. Antiaging agent is one of the most important categories of rubber additives. Rubber antioxidants can be divided into amine antioxidants, phenolic antioxidants, heterocyclic antioxidants, phosphite antioxidants and other antioxidants according to their chemical structures. Rubber anti-aging agents can be divided into three categories according to their anti-aging mechanism: free radical inhibitors, peroxide decomposers and ...

Claims

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Application Information

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IPC IPC(8): C07F5/00C07D235/28C08L7/00C08L21/00C08K5/37
Inventor 贾志欣谢婵贾德民
Owner SOUTH CHINA UNIV OF TECH
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