Method for improving aging performance of epoxidized natural rubber

A technology for natural rubber and aging properties, applied in the control field of anti-aging properties, can solve the problems of restricting the application and industrialization of epoxidized natural rubber, poor aging resistance, etc., and achieves improved anti-aging properties, low cost, and a preparation method. simple effect

Active Publication Date: 2012-04-11
ZHANJIANG KANGNIAN RUBBER PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current epoxidized natural rubber has a fatal shortcoming: the ring-opening and crosslinking of epoxy groups under acid catalysis, resulting in very poor aging resistance
It is because of this shortcoming that the application and industrialization of epoxidized natural rubber are restricted.

Method used

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  • Method for improving aging performance of epoxidized natural rubber
  • Method for improving aging performance of epoxidized natural rubber
  • Method for improving aging performance of epoxidized natural rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a Preparation of lanthanum stearate

[0036] Dissolve 4.8g (0.12mol) of sodium hydroxide in 100ml of water, slowly add 13g (0.04mol) of lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), the reaction was stirred at 80° C. for 30 min, followed by the addition of 30.48 g (0.12 mol) of stearic acid. The precipitate that reaction generates is filtered, then, vacuum-dried to constant weight, the structural formula that obtains white powder is (c 17 h 35 COO) 3 Lanthanum stearate of La, standby;

[0037] b component and number of servings

[0038] Epoxidized natural rubber with a degree of epoxidation of 10% 100; stearic acid 2; zinc oxide 5; accelerator NS 1.5; sulfur 1.5; lanthanum stearate 0.5.

[0039] c mixing and vulcanization

[0040] 1) Thinly pass the epoxidized natural rubber 10 times on the open mill (roll distance 1.4mm).

[0041] 2) Adjust the roller distance of the open mill to 0.2mm, and pass the rubber thinly twice without wrapping the roller.

[0042] 3) Adju...

Embodiment 2

[0055] a Preparation of lanthanum stearate

[0056] The preparation of lanthanum stearate is identical with embodiment 1.

[0057] b component and number of servings

[0058] Epoxidized natural rubber with 25% epoxidation degree 100; stearic acid 2; zinc oxide 5; accelerator NS 1.5; sulfur 1.5; lanthanum stearate 1.

[0059] c mixing and vulcanization

[0060] The mixing and vulcanization process and the hot air aging test are the same as in Example 1.

[0061] The mechanical properties of the epoxidized natural rubber vulcanizate with a degree of epoxidation of 25% are shown in Table 3. The tensile strength retention and elongation at break of the epoxidized natural rubber vulcanizate after aging in hot air at 100°C The rate retention rate is shown in Table 4.

[0062] Table 3 The mechanical properties of epoxidized natural rubber vulcanizate with epoxidation degree of 25%

[0063]

[0064] Table 4 Tensile strength retention and elongation at break of epoxidized natur...

Embodiment 3

[0069] a Preparation of neodymium stearate

[0070] Dissolve 4.8g (0.12mol) of sodium hydroxide in 100ml of water, slowly add 13g (0.04mol) of neodymium nitrate (Nd(NO 3 ) 3 ·6H 2 O), the reaction was stirred at 80° C. for 30 min, followed by the addition of 30.48 g (0.12 mol) of stearic acid. The precipitate that reaction generates is filtered, then, vacuum-dried to constant weight, the structural formula that obtains white powder is (C 17 h 35 COO) 3 Neodymium stearate of Nd, spare;

[0071] b component and number of servings

[0072] Epoxidized natural rubber with 25% epoxidation degree 100; Stearic acid 2; Zinc oxide 5; Accelerator NS 1.5; Sulfur 1.5; Neodymium stearate 2.

[0073] The mixing and vulcanization process and the hot air aging test are the same as in Example 1.

[0074] The mechanical properties of the epoxidized natural rubber vulcanizate with a degree of epoxidation of 25% are shown in Table 5. The tensile strength retention and elongation at break o...

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Abstract

The invention discloses a method for improving aging performance of epoxidized natural rubber. The method comprises adding 0.5-6 parts of rare earth stearate to a complexing system of epoxidized natural rubber, wherein rare earth ion with special electron structure in the rare earth stearate can maintain epoxy group stable in the aging process of the epoxidized natural rubber, reduce ring openingof the epoxy group and catch free radicals generated in the aging process of the epoxidized natural rubber, thus the aging resisting performance of the epoxidized natural rubber is improved. The method has the advantages that used rare earth stearate has no toxicity or pollution and simple preparation method, the cost is low, and mass production can be realized easily.

Description

【Technical field】 [0001] The invention relates to a technology for controlling the anti-aging performance of epoxidized natural rubber, in particular to a method for improving the aging performance of epoxidized natural rubber. 【Background technique】 [0002] Epoxidized natural rubber is prepared by reacting natural rubber latex with peracetic acid. Since the epoxy reaction is a stereospecific reaction, the cis structure in natural rubber is preserved, thereby maintaining the excellent elasticity of natural rubber; On the other hand, as a result of epoxidation, the polarity of natural rubber is increased, and the force between molecules is increased, so that it has some excellent characteristics of synthetic rubber. Compared with natural rubber, epoxidized natural rubber not only has good oil resistance, but also has excellent air tightness, adhesion and wet skid resistance. This makes the application range of epoxidized natural rubber more extensive. In addition to being d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08K5/098
Inventor 罗勇悦杨昌金彭政钟杰平何灿忠汪月琼李永振
Owner ZHANJIANG KANGNIAN RUBBER PROD CO LTD
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