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Method for preparing natural rubber-silicon dioxide nano composite material by in-situ grafting polymerization

A nano-composite material and natural rubber technology, which is applied in the field of preparing natural rubber-silica nano-composite materials by in-situ graft polymerization, can solve the problem of improving, failing to achieve the reinforcing effect, and difficult to meet the high-efficiency reinforced particle size of rubber and surface activity requirements to achieve the effect of improving mechanical properties and small particle size

Inactive Publication Date: 2010-12-22
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the above-mentioned filler particles to meet the particle size and surface activity requirements for high-efficiency rubber reinforcement. If they are used directly without modification, a good reinforcing effect cannot be achieved.
In addition, the traditional reinforcement system and anti-aging system are used alone, and each performs its own duties. A single filler cannot improve the comprehensive performance of natural rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] (1) Put 0.1 part of coupling agent γ-methacryloxypropyltrimethoxysilane in a flask filled with 95% ethanol for 2 hours for hydrolysis, then add it to 95% ethanol as solvent, containing In 1 part of nano-silica suspension, adjust the pH value of the mixture to 8, stir, centrifuge, and freeze-dry to obtain coupling-modified nano-silica powder.

[0026] (2) The surface coupling modified nano silicon dioxide powder obtained in (1) is ultrasonically dispersed with distilled water as a solvent for 15 minutes, and 0.1 part of sodium lauryl sulfate is added, stirred and mixed evenly, and the pH value is adjusted to 10 to obtain The suspension is poured into a three-necked bottle equipped with 20 parts of centrifuged concentrated natural rubber latex with a total solid content of 60%, stirred and mixed evenly to obtain a nano-silica, milky natural rubber mixed solution.

[0027] (3) Take 3 parts of methyl methacrylate, 0.04 part of tert-butyl hydroperoxide, 0.03 part of oleic ac...

example 2

[0030] (1) Place 0.05 parts of coupling agent γ-methacryloxypropyltrimethoxysilane in a flask filled with 95% ethanol for 2 hours and then add it to 95% ethanol as solvent containing In the suspension of 0.5 parts of nano-silica, adjust the pH value of the mixed solution to 8, stir, centrifuge, and freeze-dry to obtain coupling-modified nano-silica powder.

[0031] (2) The surface coupling modified nano-silica powder obtained in (1) was ultrasonically dispersed with distilled water as a solvent for 20 minutes, and 0.05 part of sodium lauryl sulfate was added, stirred and mixed evenly, and the pH value was adjusted to 10 to obtain The suspension is poured into a three-necked bottle equipped with 25 parts of centrifuged concentrated natural rubber latex with a total solid content of 60%, stirred and mixed evenly to obtain a nano-silica, milky natural rubber mixed solution.

[0032] (3) Take 1.5 parts of methyl methacrylate, 0.02 parts of tert-butyl hydroperoxide, 0.015 parts of ...

example 3

[0035](1) Put 0.1 part of coupling agent γ-methacryloxypropyltrimethoxysilane in a flask filled with 95% ethanol for 3 hours for hydrolysis, then add it to 95% ethanol as solvent, containing In 1 part of nano-silica suspension, adjust the pH value of the mixture to 8, stir, centrifuge, and freeze-dry to obtain coupling-modified nano-silica powder.

[0036] (2) Ultrasonic dispersion of the surface coupling modified nano-silica powder obtained in (1) with distilled water as a solvent for 15 minutes, adding 0.1 part of sodium lauryl sulfate, stirring and mixing evenly, adjusting the pH value to 10, and obtaining The suspension is poured into a three-necked bottle equipped with 33 parts of concentrated natural rubber latex with a total solid content of 60% by centrifugal concentration, stirred and mixed evenly to obtain a mixed solution of nano silicon dioxide and natural rubber latex.

[0037] (3) Take 3 parts of methyl methacrylate, 0.04 part of tert-butyl hydroperoxide, 0.03 pa...

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Abstract

The invention provides a method for utilizing in-situ graft polymerization to prepare a natural rubber-silica nano-composite material. The method comprises the following steps of adopting a coupling agent to modify the surface of nano-silica, leading double bond into the surface of the nano-silica, directly blending the nano-silica with lacteous natural rubber, adding hydrophilic monomer for in-situ graft polymerization and closely combining the silica with the natural rubber in a chemical bond mode through the bridge function of hydrophilic monomer polymers, so as to prepare the natural rubber-silica nano-composite material. The preparation method realizes that the uniform distribution and small particle size of the nano-silica in the natural rubber, improves the mechanical properties ofthe natural rubber, and provides technical guarantee for preparing the nano-composite material rubber products with excellent comprehensive properties.

Description

[Field of invention] [0001] The invention relates to a preparation method of a natural rubber composite material, in particular to a method for preparing a natural rubber-silicon dioxide nanometer composite material by in-situ graft polymerization. [Background technique] [0002] In recent years, materials scientists have attached great importance to the research of polymer-based nanocomposites. Due to the unique nano-effects of nanofillers, polymer / inorganic filler nanocomposites can significantly improve the properties of polymer matrices. [0003] Nano-silica is amorphous white powder, which is a non-toxic, odorless, and non-polluting non-metallic material. The microstructure is spherical, and it is a quasi-granular structure of floc and net. It has the characteristics of large specific surface area and low density. . Its small size effect and macroscopic quantum tunneling effect make it produce silting effect, which can go deep into the vicinity of the unsaturated bond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F253/00C08F2/44C08K9/06
Inventor 彭政邱权芳罗勇悦孔令学吕明哲李永振
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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