Method for preparing highly grafted silanization modified clay/rubber nanocomposite material

A technology of rubber nano-composite materials, applied in the field of polymer materials, can solve the problems of general modification effect, affecting grafting effect, etc., and achieve the effect of overcoming aggregation

Active Publication Date: 2019-04-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When less acid is added to the silane coupling agent, the acid is almost used to participate in the hydrolysis of the silane coupling agent, and the hydroxyl groups on the surface of the clay cannot be activated, so the modification effect is general. When too much acid is added, the acid can not only participate in the hydrolysis of the silane coupling agent, but also participate in the activation of the hydroxyl groups on the clay surface, but the excess acid promotes the self-polymerization of the silane coupling agent to a certain extent, affecting its Grafting effect

Method used

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  • Method for preparing highly grafted silanization modified clay/rubber nanocomposite material
  • Method for preparing highly grafted silanization modified clay/rubber nanocomposite material
  • Method for preparing highly grafted silanization modified clay/rubber nanocomposite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Add 800 g of natural sodium-based montmorillonite to 10 L of deionized water, stir at a speed of 800 r / min for 8 hours, let stand for 24 hours, take the upper layer to clear the night, and obtain a montmorillonite suspension with a solid content of 5%, dilute with water to montmorillonite suspension A with a solid content of 3%. 180 g of absolute ethanol was dissolved in 10 g of deionized water, and 0.20 g of concentrated hydrochloric acid was added to make the hydrogen ion concentration in the solution 0.008 mol / L. Control the temperature of the system at 20°C. After ultrasonication for 5 minutes, add 10.0 g of γ-methacryloxypropyltrimethoxysilane (KH570) dropwise into the solvent, stir for 10 minutes, let stand for 5 minutes, and add to 333 g of Mongolian In the desoil suspension A, the temperature was raised to 85° C., and the reaction was stirred for 5 hours to obtain the suspension B.

[0062] Table 2 shows the grafting situation of the clay modified with acidifyi...

Embodiment 2

[0066] The difference from Example 1 is that the mass of hydrochloric acid used to acidify γ-methacryloxypropyltrimethoxysilane in this example is 0.08 g, so that the concentration of hydrogen ions in the solution is 0.003 mol / L. Other vulcanization aids and implementation process are identical with example 1. Among them, styrene-butadiene rubber is 100phr, and clay is 10phr. Tested according to national standards, the mechanical properties of composite materials are shown in Table 1, and the stress-strain curves are shown in figure 1 Curve (b) in.

Embodiment 3

[0068]The difference from Example 1 is that the mass of hydrochloric acid used to acidify γ-methacryloxypropyltrimethoxysilane in this example is 0.40 g, so that the concentration of hydrogen ions in the solution is 0.017 mol / L. Other vulcanization aids and implementation process are identical with example 1. Among them, styrene-butadiene rubber is 100phr, and clay is 10phr. Tested according to national standards, the mechanical properties of composite materials are shown in Table 1, and the stress-strain curves are shown in figure 1 Curve (c) in.

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Abstract

The invention relates to a method for preparing a highly grafted silanization modified clay/rubber nanocomposite material. According to the method, a silane coupling agent is treated with an acid to make a surface have more active silicon hydroxyl groups, and then is added to a clay slurry, the acid in the system can simultaneously activate the surface of clay to produce reactive hydroxyl groups,and a grafting reaction is completed in an aqueous phase; and a aqueous suspension of silane coupling agent-grafted clay is stirred and mixed with rubber latex, and the clay/rubber nanocomposite material is obtained by flocculation, washing, drying, mixing and a vulcanization process. By increasing hydrolysis of the silane coupling agent and increasing the amount of reactive hydroxyl groups on thesurface of the clay, the method enables the grafting amount of the silane coupling agent to be increased, thereby enhancing interaction between the clay and rubber, and mechanical properties of the rubber is increased.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing highly grafted silanized modified clay / rubber nano composite materials. Background technique [0002] The clay mineral montmorillonite has a two-dimensional sheet structure with a thickness of 1.02 nm and a width of several hundred nanometers to several microns. It is used to fill rubber to prepare montmorillonite / rubber nanocomposites, which endow rubber materials with excellent mechanical properties and gas barrier properties. In the rubber industry, clay is used as a reinforcing agent for rubber to replace part of white carbon black, which can not only reduce environmental pollution caused by the use of white carbon black, but also improve the performance of materials due to the low filling percentage of clay. So that clay has broad and bright prospects as a new type of filler for rubber. [0003] Since the surface of clay is hydrophilic an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06C08K3/34C08K9/06
CPCC08K3/346C08K9/06C08L9/06
Inventor 吴晓辉李玉洁王益庆李晓林张立群
Owner BEIJING UNIV OF CHEM TECH
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