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Benzimidazole Binuclear Zinc Metal Complex and Its Application in PVC Heat Stabilizer

A technology of benzimidazole and heat stabilizer, applied in the direction of zinc organic compounds, etc., to achieve the effects of improving colorability and long-term thermal stability, good application prospects and low cost

Active Publication Date: 2016-04-06
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the existing PVC heat stabilizers, the present invention synthesized a benzimidazole binuclear zinc metal complex with a binuclear structure, and compounded it with calcium stearate and other co-stabilizers to obtain a green and efficient PVC heat stabilizer. stabilizer

Method used

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  • Benzimidazole Binuclear Zinc Metal Complex and Its Application in PVC Heat Stabilizer
  • Benzimidazole Binuclear Zinc Metal Complex and Its Application in PVC Heat Stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of Ligand L

[0029] Weigh isophthalic acid (1.66g, 10mmol) and 4,5-dimethyl-o-phenylenediamine (3.40g, 25mmol), grind for half an hour, mix well, and add to a 100ml single-necked round bottom flask. 40ml of polyphosphoric acid was slowly added, and the mixture was slowly warmed up to 230°C in an oil bath, stirred and refluxed, and reacted for 4 hours. The temperature of the reaction solution was lowered to 100° C., and the obtained colorless solution was poured into 500 ml of ice water while vigorously stirring, and a large amount of white solids precipitated out. After suction filtration, the obtained solid was added to 600 ml of saturated aqueous sodium bicarbonate solution, and stirred for 12 hours. Filter again with suction and dry the resulting solid in an oven. Finally, recrystallize with 160ml of methanol and place it in the refrigerator to obtain a colorless crystal product, which is ligand L, 1,3-bis(2-(5,6-dimethylbenzimidazole))benzene, and...

Embodiment 2

[0040] Preparation of PVC heat stabilizer: the benzimidazole dinuclear zinc metal complex Zn prepared in Example 1 2 L 2 (H 2 PO 3 ) 4 It is used to prepare PVC heat stabilizer, and will be added to a certain amount of PVC to obtain PVC composition, and test the heat stability of PVC composition. The components of the PVC composition and the content (parts by weight) of each component are shown in Table 1.

[0041] The content of each component of the prepared PVC composition of table 1 embodiment 2

[0042] formula

W1

W2

W3

W4

W5

W6

pvc

100

100

100

100

100

100

calcium carbonate

20

20

20

20

20

20

Dioctyl phthalate

30

30

30

30

30

30

stearic acid

0.6

0.6

0.6

0.6

0.6

0.6

Paraffin

0.4

0.4

0.4

0.4

0.4

0.4

calcium stearate

0.8

0.8

0.8

0.8

0.8

0.8

beta diket...

Embodiment 3

[0048] Different from Example 2, the PVC heat stabilizer consists of the following components in parts by weight: benzimidazole dinuclear zinc metal complex Zn 2 L 2 (H 2 PO 3 ) 4 3.5 parts, 10 parts of calcium carbonate, 40 parts of dioctyl phthalate, 0.4 parts of stearic acid, 0.5 parts of paraffin, 0.6 parts of calcium stearate and 0.6 parts of β-diketone. The PVC heat stabilizer will be added to 100 parts by weight of PVC to obtain a PVC composition. The thermal stability test of the PVC composition showed that it was still white after 80 minutes.

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Abstract

The invention discloses a benzimidazole binuclear zinc metal complex and an application of the complex in a PVC (polyvinyl chloride) thermal stabilizer. The benzimidazole binuclear zinc metal complex Zn2L2(H2PO3)4 is prepared by the following steps: firstly, by using m-phthalic acid and 4, 5-dimethyl o-phenylenediamine as an initial raw material and polyphosphoric acid as a solvent and a catalyst, preparing a benzimidazole ligand 1, 3-di(2-(5, 6-dimehtyl benzimidazole)) benzene (ligand L); and preparing the complex by means of a simple solution method. By using the benzimidazole binuclear zinc metal complex Zn2L2(H2PO3)4 as a main raw material which is supplemented with other co-stabilizers to prepare a compound stabilizer, and the compound stabilizer is added into PVC to synergically improve the thermal stability of PVC. For 100 parts of PVC by weight, the additive amount of the complex is 0.2-3.5 parts by weight, preferably 0.5-1.5 parts by weight. The thermal stabilizer disclosed by the invention is convenient to prepare, can be used for improving the stainability of PVC and the long-term thermal stability, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis and coordination chemistry, and relates to benzimidazole complexes, in particular to the synthesis of a benzimidazole dinuclear zinc metal complex and its application in PVC heat stabilizers. Background technique [0002] Due to the structural defects of polyvinyl chloride (PVC), it is easy to degrade due to dehydrochlorination reaction under the condition of heat, light, oxygen or mechanical shear, so it is necessary to add heat stabilizer to PVC products. Lead salt stabilizers have dominated the stabilizer market in my country for a long time. However, with the enhancement of people's awareness of environmental protection, the use of lead salt heat stabilizers has been gradually restricted. In this context, organotin has been widely used in the United States and Europe, but the price of organotin heat stabilizers is relatively high, so it is difficult to popularize and use them in my ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F3/06C08L27/06C08K13/02C08K5/3447C08K3/26C08K5/12C08K5/09C08K5/01C08K5/098C08K5/07
Inventor 刘法谦李荣勋丁乃秀黄兆阁苏娟刘莉梁坤刘光烨
Owner QINGDAO UNIV OF SCI & TECH
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