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

A technology for nano-composite materials and natural rubber, 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 reinforcement effect, and being difficult to meet the particle size of high-efficiency rubber reinforcement. and surface activity requirements, etc., to achieve the effect of improving mechanical properties and small particle size

Inactive Publication Date: 2009-04-29
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 containing 95% ethanol for 2 hours to hydrolyze, and then add it to 95% ethanol as a solvent, containing In 1 part of nano silica suspension, adjust the pH value of the mixture to 8, stirring, centrifuging, and freeze-drying to obtain coupling modified nano silica powder.

[0026] (2) Disperse the surface-coupling-modified nano-silica powder obtained in (1) ultrasonically for 15 minutes with distilled water as a solvent, add 0.1 part of sodium lauryl sulfate, stir and mix uniformly, and adjust the pH to 10 to obtain The suspension was poured into a three-necked bottle containing 20 parts of concentrated natural rubber latex with a total solid content of 60% by centrifugal concentration, and stirred and mixed uniformly to obtain a nano-silica and milky natural rubber mixture.

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

example 2

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

[0031] (2) Disperse the surface-coupling-modified nano-silica powder obtained in (1) ultrasonically for 20 minutes with distilled water as a solvent, add 0.05 parts of sodium lauryl sulfate, stir and mix uniformly, and adjust the pH to 10 to obtain The suspension was poured into a three-necked bottle containing 25 parts of concentrated natural rubber latex with a total solid content of 60% by centrifugal concentration, and stirred and mixed uniformly to obtain a nano-silica and milky natural rubber mixture.

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

example 3

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

[0036] (2) Disperse the surface-coupling-modified nano-silica powder obtained in (1) ultrasonically for 15 minutes with distilled water as a solvent, add 0.1 part of sodium lauryl sulfate, stir and mix uniformly, and adjust the pH to 10 to obtain The suspension was poured into a three-necked bottle containing 33 parts of concentrated natural rubber latex with a total solid content of 60% by centrifugation, and stirred and mixed uniformly to obtain a mixture of nano-silica and natural rubber latex.

[0037] (3) Take 3 parts of methyl methacrylate, 0.04 parts of tert-butyl hydroperoxide, 0.03 parts of oleic acid, and 1.5 par...

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PUM

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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 of the 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 method for preparing a natural rubber composite material, in particular to a method for preparing a natural rubber-silica nano 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-effect of nano-filler, the polymer / inorganic filler nano-composite can significantly improve the performance of the polymer matrix. [0003] Nano-silica is an amorphous white powder. It is a non-toxic, odorless, and non-polluting non-metallic material. The microstructure is spherical, with a flocculent and net-like quasi-particle structure. It has the characteristics of large specific surface area and low density. . Its small size effect and macroscopic quantum tunneling effect make it produce siltation, which can penetrate deeply into the unsaturated bonds of polymer chains and i...

Claims

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Application Information

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Patent Type & Authority Applications(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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