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A kind of natural rubber/nanometer silicon dioxide composite material and preparation method thereof

A technology of nano-silica and natural rubber, applied in the field of rubber composite materials, can solve the problems of stress concentration of composite materials, unfavorable processing of composite materials, poor mechanical properties, etc., and achieve the effects of weakening agglomeration, avoiding water pollution problems, and reducing losses

Active Publication Date: 2021-01-26
HENAN UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation process of traditional mechanical blending method, the mixing energy consumption is high, and dust is easy to be generated, causing environmental pollution, large loss of filler, uneven dispersion, which is not conducive to the processing of composite materials, and directly leads to stress concentration and poor mechanical properties of composite materials.

Method used

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  • A kind of natural rubber/nanometer silicon dioxide composite material and preparation method thereof
  • A kind of natural rubber/nanometer silicon dioxide composite material and preparation method thereof
  • A kind of natural rubber/nanometer silicon dioxide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Based on the dry rubber content of natural rubber emulsion 100phr, take 3.75phr ethanol, 30phr vinyltriethoxysilane modified nano-silica (soak the surface-modified nano-silica with ethanol), and then add it to 116.25phr distilled water , be warming up to 50 ℃, after stirring for 20min, prepare the nano-silica alkanol aqueous solution of 20% solid content; and ammoniated natural rubber latex (25% of dry rubber content) 400g, under the condition of 50 ℃, flow control (can be according to actual situation adjustment) and pumped into the reaction kettle at the same time, stirring at a speed of 200rad / min for 10 minutes to obtain composite micelles (flocs); the flocs were crepe, washed, crushed, and dried to obtain natural rubber / nano-silicon dioxide composite material.

[0043] The content of silicon dioxide in the composite material prepared in this example is shown in Table 1. It can be seen from Table 1 that the loss of nanometer silicon dioxide during the mixing process...

Embodiment 2

[0046] Based on 100phr of dry rubber content of natural rubber emulsion, get 6.25phr propanol, 50phr γ-(2,3-epoxypropoxy) propyltrimethoxysilane modified nano-silica (impregnated with propanol through surface modification) Nano silicon dioxide), then join in 193.75phr distilled water, be warming up to 60 ℃, after stirring for 20min, prepare the nano silicon dioxide alkanol aqueous solution of 20% solid content; 400g, under the condition of 70°C, control the flow rate and pump into the reaction kettle at the same time, stir at the speed of 200rad / min for 8min, and then the composite micelles (flocs) can be obtained; and dry to obtain the natural rubber / nano silicon dioxide composite material.

[0047] The silica content in the composite material prepared in this example is shown in Table 1. The above-mentioned natural rubber / nano-silica composite material 150phr, Si695phr, zinc oxide 5phr, stearic acid 1.5phr, accelerator CBS 1.5phr, accelerator D0.5phr, sulfur 1.5phr, mixing,...

Embodiment 3

[0049] Based on the dry rubber content of natural rubber emulsion 100phr, get 8.75phr propylene glycol, 70phr dimethyldiethoxysilane modified nano-silica (infiltrate the surface-modified nano-silica with propylene glycol), then add to 271.25phr distilled water In the process, heat up to 70°C, stir for 20 minutes, prepare a 20% solid content nano-silica alkanol aqueous solution; and 400g of ammoniated natural rubber latex (dry rubber content 25%), at 50°C, control the flow rate and pump it into the reaction at the same time kettle, stirring at a speed of 200 rad / min for 15 minutes to obtain composite micelles (flocs); crepe, wash, crush, and dry the composite micelles (floes) to obtain natural rubber / nanometer silica composite Material.

[0050] The silica content in the composite material prepared in this example is shown in Table 1.

[0051] The above-mentioned natural rubber / nano-silica composite material 170phr, Si695phr, zinc oxide 5phr, stearic acid 1.5phr, accelerator C...

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Abstract

The invention belongs to the technical field of rubber composite materials, and in particular relates to a natural rubber / nano silicon dioxide composite material and a preparation method thereof. The preparation method of the natural rubber / nano-silica composite material includes the following steps: (1) after the surface-modified nano-silica is infiltrated by alkyl alcohol, it is dispersed in water and stirred to obtain a nano-silica dispersion; ( 2) Mix the nano-silica dispersion with the natural rubber emulsion, stir at 15-70°C for 1-30 min, and perform demulsification and flocculation to obtain flocs; (3) The flocs are obtained after post-treatment. The present invention uses surface-modified nano-silica as filler, which can realize the flocculation of natural rubber emulsion without using flocculant; Wet-mixed rubber is obtained through the processes of sheeting, washing, hammer milling, drying and other processes.

Description

technical field [0001] The invention belongs to the technical field of rubber composite materials, and in particular relates to a wet mixing preparation method of natural rubber / nano silica composite materials. Background technique [0002] Nano-silica, also known as white carbon black, has similar reinforcing properties to carbon black and is a commonly used reinforcing filler for rubber materials. Its surface contains a large amount of silanol, small particle size, large specific surface area, and strong polarity. It is easy to agglomerate in non-polar rubber materials, which reduces the reinforcing effect. After proper surface organic modification, the surface polarity can be reduced and the compatibility with rubber can be enhanced. [0003] The commonly used method for rubber nanocomposites is mainly the mechanical blending method, using mechanical equipment such as double-roll mills, internal mixers, and screw extruders to plasticize and knead rubber materials and pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08K9/06C08K9/04C08K3/36C08C1/14
CPCC08C1/14C08K3/36C08K9/04C08K9/06C08K9/08C08K2201/011C08L7/00
Inventor 张治军李小红田庆丰丁涛胡延昆张立群
Owner HENAN UNIVERSITY
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