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Method for preparing epoxidized natural rubber

A technology of natural rubber and epoxidation, which is applied in the field of ultrasonically accelerated epoxidation reaction to prepare epoxidized natural rubber, which can solve the problems that epoxidized natural rubber cannot achieve quality consistency, so as to ensure product quality and quality consistency , Excellent performance, suppress the effect of open loop

Inactive Publication Date: 2011-01-12
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is also the fundamental reason why epoxidized natural rubber cannot achieve quality consistency

Method used

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  • Method for preparing epoxidized natural rubber
  • Method for preparing epoxidized natural rubber

Examples

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Effect test

Embodiment 1

[0024] Taking by weighing 100 parts of total solids content is the concentrated natural rubber latex of 60%, the concentration of concentrated natural rubber latex is diluted to 30% with deionized water, adding 3 parts of concentration is 20% polyoxyethylene laurate, makes latex keep stable 2 hours later. Then, 21.6 parts of formic acid with a concentration of 86% and 43.2 parts of hydrogen peroxide with a concentration of 30% were sequentially added under stirring, and reacted in a water bath at 50° C. for 6 hours, and treated with 20 KHz ultrasonic waves for 10 minutes every 50 minutes. After the reaction, use a cold water bath to lower the temperature to room temperature, add ammonia water to adjust the pH value of the latex to 9, add ethanol to solidify, dehydrate, rinse, granulate, and dry. The prepared epoxidized natural rubber has an epoxidation degree of 12.6%, a ring-opened substance content of 0.4%, and a double bond content of 87%.

Embodiment 2

[0026]Taking by weighing 100 parts of total solids content is the concentrated natural rubber latex of 60%, the concentration of concentrated natural rubber latex is diluted to 30% with deionized water, adding 3 parts of concentration is 20% polyoxyethylene laurate, makes latex keep stable 2 hours later. Then 21.6 parts of 86% strength formic acid and 43.2 parts of 30% strength hydrogen peroxide were added successively under stirring. React in a water bath at 50°C for 12 hours, and use 20KHz ultrasonic waves to sonicate for 10 minutes every 50 minutes. After the reaction, use a cold water bath to lower the temperature to room temperature, add ammonia water to adjust the pH value of the latex to 9, add ethanol to solidify, dehydrate, rinse, granulate, and dry. The prepared epoxidized natural rubber has an epoxidation degree of 32.5%, a ring-opened substance content of 1.2%, and a double bond content of 65.5%.

Embodiment 3

[0028] Taking by weighing 100 parts of total solids content is the concentrated natural rubber latex of 60%, the concentration of concentrated natural rubber latex is diluted to 30% with deionized water, adding 3 parts of concentration is 20% polyoxyethylene laurate, makes latex keep stable 2 hours later. Then 21.6 parts of 86% strength formic acid and 43.2 parts of 30% strength hydrogen peroxide were added successively under stirring. React in a water bath at 50°C for 24 hours, and use 20KHz ultrasonic waves to sonicate for 10 minutes every 50 minutes. After the reaction, use a cold water bath to lower the temperature to room temperature, add ammonia water to adjust the pH value of the latex to 9, add ethanol to solidify, dehydrate, rinse, granulate, and dry. The prepared epoxidized natural rubber has an epoxidation degree of 49.5%, a ring-opened substance content of 2.8%, and a double bond content of 48.7%.

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Abstract

The invention discloses a method for preparing epoxidized natural rubber, which comprises the following steps of: diluting 100 parts of condensed natural rubber latex with the total solid content of 60 percent with deionized water until the total solid content is 30 percent, adding 1 to 3 parts of 20 percent polyoxyethylene lauryl ether with stirring, stabilizing the mixed solution for 2 hours, slowly adding 16 to 24 parts of 86 percent formic acid and 35 to 45 parts of 30 percent hydrogen peroxide, finishing reaction at certain reaction temperature, for a certain reaction time and in an ultrasonic treatment way, adjusting a pH value to 8 to 9 with ammonia water, and performing coagulation, dehydration, rinsing, granulation and drying to prepare the epoxidized natural rubber with the epoxidization degree of 10 to 50 percent, the ring-opening substance content of less than 3.0 percent, relatively higher quality consistency and capability of satisfying needs in application performance.

Description

technical field [0001] The invention relates to a method for preparing epoxidized natural rubber by ultrasonically accelerating epoxidation reaction. Background technique [0002] The structural unit of natural rubber (NR) is cis-1,4-isoprene, and a hydrogen atom on the carbon atom of the double bond is replaced by a methyl group, resulting in an increase in the electron cloud density of the double bond, which is prone to occur with peroxide Acid electrophilic reaction. Part of the double bonds on the molecular chain of NR are chemically modified by epoxidation to prepare epoxidized natural rubber (ENR), which not only retains the structure and performance characteristics of NR, but also can produce partial phase with non-polar rubber such as NR, SBR, BR, etc. Compatibility and co-vulcanization, and has a certain polarity and reactivity of epoxy groups, which is conducive to improving the grip (wet skid resistance) of rubber on wet road surfaces, and can produce strong dipo...

Claims

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Application Information

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IPC IPC(8): C08C19/06
Inventor 彭政何灿忠罗勇悦钟杰平李永振李希娟
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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