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Preparation method of preprocessed clay/rubber nano composite material

A composite material and rubber nanotechnology, which is applied in the field of preparing high-performance and highly dispersed clay/rubber nanocomposites, can solve the problems of clay sheet aggregation, poor interaction, and low grafting amount of silane coupling agent grafted clay, etc. To achieve the effect of simple process

Active Publication Date: 2014-01-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a technical solution to solve the problems of low grafting amount of silane coupling agent grafted clay, poor interaction with rubber, and serious aggregation of clay flakes in the vulcanization process; realize the preparation of high interface strength, A method for high performance and highly dispersed clay / rubber nanocomposites

Method used

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  • Preparation method of preprocessed clay/rubber nano composite material
  • Preparation method of preprocessed clay/rubber nano composite material
  • Preparation method of preprocessed clay/rubber nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 500 g of commercially available natural sodium-based bentonite into 10 L of deionized water, stir at 800 r / min for 8 hours, and let stand for 24 hours to obtain a clay / water suspension with a solid content of 2.0%. Take 250g of clay / water suspension A, add concentrated hydrochloric acid to make the concentration of HCl 0.02mol / L, and stir and react at 60°C for 3h. Neutralize to pH=7 with sodium carbonate. The temperature was raised to 80° C., 5.0 g of γ-methacryloxypropyltrimethoxysilane was added, and the reaction was stirred for 5 hours to obtain a suspension B. Suspension B was centrifuged at 4000r / min for 20min, and the precipitate was added to 250g of absolute ethanol, stirred at 60°C for 30min at 400r / min to obtain suspension C. Then the suspension C was centrifuged at 4000r / min for 20min, and the sediment was washed twice with absolute ethanol. Then add the sediment obtained by centrifugation into water, stir at room temperature for 30 minutes, and rotate a...

Embodiment 2

[0043] The difference from Example 1 is that 500 g of the clay / water suspension was acid-treated, and 10.0 g of γ-methacryloxypropyltrimethoxysilane was added. Other processes and vulcanization aids were the same as in Example 1. Among them, styrene-butadiene rubber is 100phr, and clay is 10phr. Mix various additives to obtain rubber compound. Vulcanize according to the positive curing time at 170 degrees Celsius to obtain clay / rubber nanocomposites. 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 .

Embodiment 3

[0045] The difference from Example 2 is that the acid used in the acid treatment is concentrated sulfuric acid, and the clay / water suspension is added to make the hydrogen ion concentration of the system 6 mol / L. Other techniques and vulcanization aids are the same as in Example 1. Among them, styrene-butadiene rubber is 100phr, and clay is 10phr. Mix various additives to obtain rubber compound. Vulcanize according to the positive curing time at 170 degrees Celsius to obtain clay / rubber nanocomposites. 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 (d) in .

[0046] Compared with Comparative Example 2 and Comparative Example 3, the tensile strength, modulus and tear strength of the clay / rubber nanocomposites prepared in Example 2 and Example 3 are all significantly improved.

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Abstract

The invention relates to a preparation method of a preprocessed clay / rubber nano composite material. The preparation method comprises the following steps: first subjecting the clay to an acid process to increase the reactive hydroxyl groups on the clay surface; subjecting the acid-processed clay to carry out grafting reactions with a silane coupling agent in a water phase, wherein the grafting amount is 0.1-1.1*10<-3> mole for each gram of clay; stirring and mixing the water suspension containing the clay grafted with a silane coupling agent with rubber emulsion, then subjecting the mixture to processes of flocculating, washing, drying, mixing, and vulcanizing so as to obtain the clay / rubber nano composite material. The reactive hydroxyl group number on the clay surface is increased through the acid process, thus the grafting amount of the silane coupling agent is increased, so that the interaction between the clay and the rubber is strengthened. The preparation method provided by the invention strengthens the interfacial strength between the clay and the rubber, solves the severe clay aggregation problem caused by high-temperature and high pressure during the sulfuration process at the same time, and obtains a high surface strength, high performance, and high dispersant clay / rubber nano composite material.

Description

technical field [0001] The present invention provides a method for preparing high-performance and highly dispersed clay / rubber nano-composite materials improved on the applicant's original emulsion composite clay / rubber nano-composite technology (authorized Chinese invention patent: ZL98101496.8); specifically It is a method of increasing the grafting amount of silane coupling agent on the surface of clay by acid treatment of clay. During the vulcanization process, silane coupling agent and rubber macromolecules are connected by covalent bonds, which improves the interface strength between clay and rubber, thus The method solves the problem of serious aggregation of clay caused by high temperature and high pressure during the vulcanization process, and obtains a high-performance and highly dispersed clay / rubber nanocomposite material. Background technique [0002] Clay mineral montmorillonite has a two-dimensional sheet structure with a thickness of 0.96nm and a width of sev...

Claims

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Application Information

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IPC IPC(8): C08L9/06C08L7/00C08L11/00C08L9/02C08L13/00C08K9/06C08K3/34
Inventor 张立群查超王益庆吴友平吴晓辉樊梅秀
Owner BEIJING UNIV OF CHEM TECH
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