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Method for preparing high-dispersion white carbon black/rubber nano composite material

A high-dispersion silica and rubber nanotechnology, applied in the field of preparing high-dispersion silica/rubber nanocomposites, can solve the problems of reducing rubber fluidity, low drying temperature, etc. The effect of increased surface area

Active Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, these technologies are only limited to the preparation of powder rubber, and there are no patents and reports on applying it to bulk rubber and nanocomposites. Therefore, these technologies also take measures, such as crosslinking rubber and using lower drying temperatures. Etc., reduce the fluidity of rubber and prevent re-aggregation of powdered rubber after spraying

Method used

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  • Method for preparing high-dispersion white carbon black/rubber nano composite material
  • Method for preparing high-dispersion white carbon black/rubber nano composite material
  • Method for preparing high-dispersion white carbon black/rubber nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Add 8 g of γ-methacryloxypropyltrimethoxysilane to 3.6 L of deionized water. Weigh 400g of precipitated silica, add the weighed silica into the solution, stir the turbid solution at a constant speed to make the components in the turbid solution evenly dispersed, the stirring rate should be 1000rpm, and the stirring time should be 2 hours to obtain White carbon black water slurry, at this time, the mass percentage of white carbon black in the water slurry is 10%. The white carbon black water slurry is mixed with 1.2kg of natural rubber emulsion with a solid content of 50%. At this time, the solid content in the mixed solution is less than 20%. With a stirring speed of 600rpm, stir for 8 hours to obtain a uniform mixed solution. When silica accounts for 40% by mass of the rubber composite material. Put the mixture of silica / rubber latex through a spray drying device. The drying medium is hot air at 350°C, that is, the inlet temperature is 350°C, and the outlet temperature...

Embodiment 2

[0043] In 500ml deionized water, add 216g through two-(γ-triethoxysilylpropyl)-tetrasulfide modified precipitated white carbon black, wherein the coupling agent consumption is 8% of the white carbon black quality, this When the mass percentage of white carbon black in the water slurry is 30%, the turbid liquid is stirred at a uniform speed to make each component in the turbid liquid evenly dispersed, the stirring speed should be 600rpm, and the stirring time is 2 hours to obtain the white carbon black water slurry. Then disperse the water slurry with ultrasonic wave, the ultrasonic frequency power is 300KW, and the ultrasonic time is 30min each time, a total of 4 times. After each ultrasonic dispersion operation, the mixed solution was stirred at a stirring speed of 100 rpm for 10 minutes, the temperature of the mixed solution system was lowered to room temperature, and then the next ultrasonic dispersion operation was performed to obtain a uniformly dispersed coupling agent-mo...

Embodiment 3

[0045] Add 40 g of γ-mercaptopropyltrimethoxysilane to 1 L of deionized water mix. Weigh 400g of precipitated silica, and add the weighed silica into the solution. At this time, the mass percentage of silica in the water slurry is 28%. Stir the turbid solution at a uniform speed to make each group in the turbid solution The dispersion is uniform, the stirring speed should be 1000rpm, and the stirring time should be 2 hours to obtain a white carbon black slurry, and then disperse the slurry with ultrasonic waves, the ultrasonic frequency power is 500KW, and the ultrasonic time is 30min each time, a total of 6 times. After each ultrasonic dispersion operation, the mixed liquid was stirred at a stirring speed of 300 rpm for 10 minutes, and the temperature of the mixed liquid system was lowered to room temperature, and then the next ultrasonic dispersion operation was performed to obtain a uniformly dispersed white carbon black slurry. The white carbon black water slurry is mixed ...

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Abstract

The invention relates to a method for preparing a high-dispersion white carbon black / rubber nano composite material. According to the invention, by means of mixing rubber latex and white carbon black water slurry to obtain a uniform mixed solution and forming a great amount of micro droplets of the mixed solution by utilizing a spray drying atomization process, the specific surface area of the mixed solution is obviously increased, so that the moisture in the mixed solution is rapidly removed in a drying medium of a spray drying device; and by means of introducing a gasified flocculating agent into spray drying carrier gas and combining the spray drying process with a flocculation process, the processes of ion flocculation, rapid dehydration and the like are carried out at the same time and the speed and the efficiency of the conversion process of the white carbon black / rubber mixed solution from a liquid phase to a solid phase are improved, so that the high-dispersion white carbon black / rubber nano composite material is prepared. The method is simple to operate, is energy-saving, has low cost and wide application range and is easy for industrialization. The white carbon black / rubber nano composite material product prepared with the method has excellent comprehensive performances.

Description

technical field [0001] The invention provides a method for preparing highly dispersed white carbon black / rubber nanocomposite materials; in particular, a method for modifying white carbon black by using an emulsion compounding method and a spray drying process to prevent white carbon black from aggregating and forming high Method for Dispersing Silica / Rubber Nanocomposites. Background technique [0002] The chemical name of white carbon black is hydrated amorphous silica or colloidal silica (SiO2 nH2O), which is a white, non-toxic, amorphous fine powder. Its SiO2 content is relatively large (>90%), and the original particle size is generally 10-40nm. Because the surface contains more hydroxyl groups, it is easy to absorb water and become aggregated fine particles. Its relative density is 2.319-2.653t / m3, and its melting point is 1750°C. Insoluble in water and acid, soluble in strong alkali and hydrofluoric acid. It has excellent properties such as porosity, large inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/02C08L9/08C08L9/10C08L11/02C08L9/04C08L33/04C08L75/04C08L23/22C08L23/16C08L83/04C08L27/12C08K9/04C08K9/06C08K3/36C08C1/16
Inventor 刘力张法忠毛迎燕李岩胡水温世鹏张立群
Owner BEIJING UNIV OF CHEM TECH
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