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Method for preparing polymer/clay nano-composite

A technology of nanocomposite materials and polymers, which is applied in the field of preparation of polymer-based nanocomposite materials, can solve the problem that the modification efficiency of organic modifiers and coupling agents is not very high, and the performance of composite materials cannot be greatly improved. Problems such as large consumption of raw materials and energy, to achieve the effect of reducing mixing time, reducing energy consumption and high cost

Inactive Publication Date: 2011-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet modification of clay is to disperse the clay in water to form a suspension, then add a modifier for ion exchange modification, and then perform a series of processes such as filtration, washing, drying, grinding, and sieving. The process is complicated and the equipment is huge. , the consumption of raw materials and energy is large, which further increases the cost of organic clay and causes environmental pollution, which seriously affects the popularization and application of clay in polymers.
The solid-phase modification method of clay has the advantages of simplicity, no need for water or solvent, no environmental pollution, etc., but this method needs to use a certain amount of organic modifier and coupling agent, and the organic modifier and coupling agent The modification efficiency is not very high
Organic amines and organic quaternary ammonium salt modifiers modify the clay by intercalating into the interlayer of the clay by ion exchange, so that the interlayer distance increases, but such modifiers cannot react with the clay sheet and the matrix rubber , so the properties of the obtained composite materials cannot be greatly improved

Method used

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  • Method for preparing polymer/clay nano-composite
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  • Method for preparing polymer/clay nano-composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]First add 8 parts of commercially available montmorillonite into water for stirring and dispersing, and the solid content of montmorillonite is controlled at 2% (weight); add 8 parts of montmorillonite to the above montmorillonite suspension, and the degree of epoxidation is 25% based on dry glue , a total solid content of 25% (weight) of epoxidized natural rubber latex, stirring and dispersing to prepare a montmorillonite dispersion; then adding 100 parts of the above montmorillonite dispersion to a total solid content of 60% (weight) based on dry rubber Stir and mix evenly in the natural rubber latex, and then use 10% (weight) calcium chloride solution for flocculation. The flocs were washed with water until neutral, and dried in a vacuum oven at 80°C to constant weight to obtain NR / ENR / MMT nanocomposites. The composite material is mixed and vulcanized by adding various compounding ingredients according to the commonly used rubber formula. The physical and mechanical p...

Embodiment 2

[0043] First 40 parts of commercially available montmorillonite are added into water and stirred, and the solid content of montmorillonite is controlled at 5% (weight); adding 25 parts of montmorillonite to the above-mentioned suspension of montmorillonite is 30% in terms of dry glue, and the degree of epoxidation is 30%. Total solids content is 25% epoxidized natural rubber latex, stirs and disperses and prepares montmorillonite dispersion; Adds above-mentioned montmorillonite dispersion again and is stirred in 100 parts of styrene-butadiene rubber latexes with total solids content of 20% in dry rubber Mix well, and then use 5% octadecyltrimethylammonium chloride solution for flocculation. The flocs were washed with water until neutral, and dried in a vacuum oven at 80°C to constant weight to obtain the SBR / ENR / MMT nanocomposite. The composite material is mixed and vulcanized by adding various compounding ingredients according to the commonly used rubber formula. The tensile ...

Embodiment 3

[0045] First add 20 parts of commercially available montmorillonite into water for stirring, and at the same time add 1 part of silane coupling agent KH560, wherein the solid content of montmorillonite is controlled at 10% (weight); add 10 parts ( In terms of dry rubber) the degree of epoxidation is 15%, and the total solid content is 10% of epoxidized natural rubber latex, stirring and dispersing to prepare montmorillonite dispersion; then add the above-mentioned montmorillonite dispersion to 100 parts in dry rubber Nitrile rubber latex and carboxylated styrene-butadiene latex mixed latex are stirred and mixed evenly, wherein the mixed latex contains 50 parts of nitrile rubber latex with a solid content of 20% based on dry rubber and 50 parts with a solid content of 20% based on dry rubber. % carboxylated styrene-butadiene latex. Then use 2% (weight) hydrochloric acid solution for flocculation, wash the flocs to neutrality, and dry them in a vacuum oven at 80°C to constant we...

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Abstract

The invention relates to a method for preparing polymer / clay nano-composite by using epoxidized natural rubber latex as compatilizer of clay and a polymer. On the one hand, an epoxidized natural rubber molecular chain is inserted between clay layers to be subjected to chemical reaction with the clay layers, and the on the other hand, unsaturated double bonds in epoxidized natural rubber and the matrix polymer can be subjected to crosslinking reaction. The effect of dispersing the clay in the matrix polymer can be improved and the interaction between the clay and the matrix polymer can be enhanced by using the bridging function of the epoxidized natural rubber latex, and the high-performance polymer / clay nano-composite is prepared. The prepared polymer / clay nano-composite has excellent physical and mechanical properties and greatly improved dynamic mechanical properties.

Description

technical field [0001] The invention relates to a method for preparing a polymer-based nanocomposite material. In particular, the invention relates to a method for dispersing clay nanoplatelets in a polymer. Background technique [0002] Traditional reinforcing agents in polymers include carbon black, white carbon black and calcium carbonate, etc., and carbon black has always occupied a dominant position in the rubber industry. Among them, the size of primary particles of carbon black and white carbon black is very small, and the composite material prepared by them has excellent mechanical properties. However, they also have many serious disadvantages, such as large processing pollution; long processing time, high energy consumption for mixing; high-grade carbon black generally has better comprehensive reinforcing ability than white carbon black, so it is more commonly used in rubber Industry, but the black color of the product cannot be changed; both are difficult to give...

Claims

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Application Information

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IPC IPC(8): C08L7/02C08L9/08C08L9/04C08L13/02C08L11/02C08L75/04C08L27/06C08L33/04C08L31/04C08L23/08C08L15/00C08K9/00C08K9/04C08K9/06C08K3/34
Inventor 王小萍谭井华贾德民罗远芳
Owner SOUTH CHINA UNIV OF TECH
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