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Preparation method of special nano calcium carbonate for rubber tire

A nano-calcium carbonate, rubber tire technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of high reinforcement, stability and wear resistance of nano-calcium carbonate difficult rubber tires, poor heat resistance of unsaturated carboxylic acids, The problems such as the decline of rubber stability can improve the reinforcement performance and wear resistance, good dispersibility, and reduce the Mooney viscosity.

Inactive Publication Date: 2018-01-09
GUANGXI SHANDONGLAI CHEM IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unsaturated carboxylic acid has poor heat resistance, and the cross-linking reaction of double bonds will inevitably lead to an increase in Mooney viscosity during rubber processing, shortened scorch time, and decreased rubber stability.
[0005] The existing nano-calcium carbonate surface treatment technology is difficult to meet the high reinforcement, stability and wear resistance requirements of the rubber tire industry

Method used

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  • Preparation method of special nano calcium carbonate for rubber tire

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] Preparation of calcium hydroxide slurry:

[0028] CaCO 3 Limestone with a content greater than 98.5% is calcined at 1150°C for 3 hours to obtain quicklime, and the quicklime and water are fully digested at a temperature of 60±5°C at a weight ratio of 1:5 to obtain calcium hydroxide slurry; sieve to remove slag, and age for later use .

Embodiment 1

[0030] A kind of preparation method of nanometer calcium carbonate special for rubber tire, comprises the following steps:

[0031] (1) Slurry: Transport the aged 48h calcium hydroxide slurry to the slurry tank, control the mass concentration of the slurry to 10%, add 1% citric acid on a dry basis of calcium carbonate at a temperature of 15°C, and stir Uniform;

[0032] (2) Carbonation reaction: transport the slurry to a carbonation reactor with agitation, pass through the purified kiln gas with a CO2 volume concentration of 30% for carbonation reaction, until the pH of the slurry is reduced to 7.0, the carbonation reaction is completed, and the carbonation reaction is obtained. The specific surface area is 44.6m 2 / g of nano calcium carbonate slurry;

[0033] (3) Modifier preparation: Sodium polystyrene sulfonate and rosin were dissolved in hot water at 95°C at a mass ratio of 3:1 to prepare sodium polystyrene sulfonate and rosin with a mass concentration of 15%. Medicamen...

Embodiment 2

[0037] A kind of preparation method of nanometer calcium carbonate special for rubber tire, comprises the following steps:

[0038] (1) Slurry: Transport the aged 36h calcium hydroxide slurry to the slurry tank, control the mass concentration of the slurry to 11.5%, add 1.2% citric acid on a dry basis of calcium carbonate at a temperature of 18°C, and stir Uniform;

[0039] (2) Carbonation reaction: transport the slurry to a carbonation reactor with agitation, pass through the purified kiln gas with a volume concentration of CO2 of 33% for carbonation reaction, until the pH of the slurry is reduced to 7.0, and the carbonation reaction is completed. The specific surface area is 40.3m 2 / g of nano calcium carbonate slurry;

[0040] (3) Modifier preparation: Sodium polystyrene sulfonate and rosin were dissolved in hot water at 95°C at a mass ratio of 2:1 to prepare sodium polystyrene sulfonate and rosin with a mass concentration of 15%. Medicament, after dissolving, keep it wa...

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Abstract

The invention discloses a preparation method of special nano calcium carbonate for a rubber tire. The preparation method comprises the following steps: transporting calcium hydroxide slurry to a slurry mixing pond, adding citric acid, and uniformly stirring; introducing purified kiln gas, and performing carbonation reaction until the pH of the slurry is decreased to 7.0, wherein after the carbonation reaction is ended, nano calcium carbonate slurry is obtained; conveying the nano calcium carbonate slurry to an activation pond, introducing steam into the activation pond, then adding sodium polystyrenesulfonate and a rosin agent, stirring for 30 to 45 min, adding a pentaerythritol stearate agent, and stirring for 30 to 45 min, thus completing the surface treatment; and press filtering, drying and crushing the nano calcium carbonate slurry subjected to the surface treatment, thus obtaining the special nano calcium carbonate for the rubber tire. The nano calcium carbonate prepared by the preparation method is good in dispersity, the mooney viscosity of the rubber in a processing process can be favorably reduced, the reinforcement effect is significant, the abrasion resistance is lasting, the scorching time is appropriate, the stability is good, and after the rubber tire is filled, the reinforcement performance and the wear resistance of the tire can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, in particular to a method for preparing nano calcium carbonate special for rubber tires. Background technique [0002] Nano-calcium carbonate has the characteristics of small particle size, uniform particle size, regular shape, and large specific surface area. Its performance is far superior to that of ordinary calcium carbonate. In the application of polymer materials, it often shows the effect of strengthening and toughening. Therefore, nano-calcium carbonate can be used as a filler for rubber products. At present, the rubber products using nano-calcium carbonate in my country mainly include: tires, rubber shoes, hoses and tapes, wires and cables, and rubber sealing products. For tires, the largest product in the rubber industry, nano-calcium carbonate is the third largest reinforcing filler after carbon black and white carbon black. It has excellent processing performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C08K9/04C08K3/26C08L7/00
Inventor 熊文朱勇黄炜波
Owner GUANGXI SHANDONGLAI CHEM IND TECH CO LTD