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Preparation method for reactive polyamidoamine dendrime rubber antioxidant

A technology of rubber anti-aging agent and polyamidoamine, which is applied in the field of preparation of reactive rubber anti-aging agent, can solve the problems of poor effect and toxicity, and achieve the effects of simple preparation method, improved rubber aging performance and stable performance

Active Publication Date: 2015-03-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the former are mostly toxic and are a growing concern; the latter are less effective and have compatibility issues with the rubber matrix

Method used

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  • Preparation method for reactive polyamidoamine dendrime rubber antioxidant
  • Preparation method for reactive polyamidoamine dendrime rubber antioxidant
  • Preparation method for reactive polyamidoamine dendrime rubber antioxidant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the 1.0 generation of dendritic polyamidoamine and allyl glycidyl ether, the primary amino group / epoxy group is reacted in a molar ratio of 1:0.5. First, the 1.0 generation of dendritic polyamidoamine is dissolved in methanol, and then stirred dropwise Add allyl glycidyl ether and react at 50°C for 12 hours to obtain reactive polyamidoamine rubber antioxidant R-1.

[0020] The prepared anti-aging agent R-1 was added to NBR to prepare a rubber compound; at the same time, traditional rubber anti-aging agents 4010NA, 4020, MB, and ODA were used as comparisons. The rubber formula is: NBR: 100phr, N220 carbon black: 40phr, zinc oxide: 5phr, stearic acid: 2phr, CZ: 1.5phr, DM: 0.5phr, sulfur: 2phr, antioxidant: 2phr. After the prepared mixed rubber is parked for a period of time, determine the best positive vulcanization time for vulcanization. The mechanical properties are tested according to GB / T-528-2006; the samples are aged in an air aging box at 100°C accor...

Embodiment 2

[0022] According to the 2.0 generation of dendritic polyamidoamine and maleic anhydride in the primary amino group / acid anhydride molar ratio of 1:0.2 to react, the 2.0 generation of dendritic polyamidoamine dissolved in dimethyl sulfoxide to a homogeneous state , dropwise added dimethyl sulfoxide solution of maleic anhydride, reacted at 30°C for 0.5h, and distilled off dimethyl sulfoxide under reduced pressure to obtain reactive polyamidoamine rubber antioxidant R-2.

[0023] The prepared anti-aging agent R-2 was added to NBR, and traditional rubber anti-aging agents 4010NA, 4020, MB, and ODA were used as comparisons to prepare compound rubber. The rubber formulation, vulcanized rubber preparation, aging conditions and tests are all the same as in Example 1. The test results are given in Tables 1, 2, and 3.

Embodiment 3

[0025] React according to the molar ratio of hyperbranched polyamidoamine / 2-methyl-3-butenoic acid of 1:0.4, fully dissolve the hyperbranched polyamidoamine in N,N-dimethylformamide until it becomes After the homogeneous state, slowly drop the N,N-dimethylformamide solution of 2-methyl-3-butenoic acid under stirring conditions, and react at 60°C for 18 hours to obtain a reactive polyamidoamine rubber antioxidant R-3.

[0026] Add the prepared antiaging agent R-3 into NBR to prepare a rubber compound. The rubber formulation, vulcanized rubber preparation, aging conditions and tests are all the same as in Example 1. The test results are given in Tables 1, 2, and 3 (the aging coefficient in Table 1 1 Aging coefficient=(tensile strength after aging*elongation at break after aging) / (tensile strength before aging*elongation at break before aging)).

[0027] Table 1 Mechanical properties of NBR vulcanizates containing different antioxidants before and after aging

[0028]

[0...

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Abstract

The invention discloses a preparation method for a reactive polyamidoamine dendrime rubber antioxidant. The preparation method comprises the following steps: fully dissolving polyamidoamine in an organic solvent until polyamidoamine is in a uniform state, dropwise adding a reactant pre-dissolved in the organic solvent while stirring, reacting at 10-60 DEG C for 0.5-24 hours, and performing reduced pressure distillation to remove the organic solvent to obtain a reactive polyamidoamine rubber antioxidant with unsaturated double bonds, which is the reactive polyamidoamine dendrime rubber antioxidant, wherein the reactant is unsaturated carboxylic acid, unsaturated carboxylic ester, an epoxy compound containing double bonds or unsaturated anhydride. The antioxidant prepared by the method can be crosslinked with a rubber matrix and has remarkable advantages of good antioxidant effect, high relative molecular weight, good compatibility with a polymer matrix, extraction resistance, good environmental protection and the like.

Description

technical field [0001] The invention relates to a preparation method of a reactive rubber antiaging agent, in particular to a preparation method of a reactive dendritic polyamidoamine rubber antiaging agent. Background technique [0002] During the processing, storage and use of rubber materials, due to the influence of external oxygen, ozone, light, radiation, variable price metal ions and various corrosive chemicals, macromolecular chain breaks, depolymerization, crosslinking and ring formation are prone to occur. Such changes will make the material show aging phenomena such as softening, stickiness, hardening, and cracking on the macroscopic scale, and the material will gradually lose its original use value. This makes it very important to inhibit or delay the aging of rubber materials. Rubber anti-aging agent is a kind of rubber compounding agent that can effectively prevent or delay the aging process of rubber products. At present, the most widely used rubber anti-agin...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08L9/02C08L7/00C08L87/00
Inventor 王小萍习雪贾德民
Owner SOUTH CHINA UNIV OF TECH
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