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A kind of preparation method of nano calcium carbonate special for rubber

A nano-calcium carbonate and rubber technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of affecting the use effect and poor dispersibility, and achieve the effects of reducing oil absorption value, improving strength and improving dispersibility.

Inactive Publication Date: 2021-09-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is recognized that chain-like nano-calcium carbonate has a good reinforcing effect in rubber, but due to poor dispersion, it cannot be well compatible with rubber compounds, which affects the use effect

Method used

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  • A kind of preparation method of nano calcium carbonate special for rubber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Limestone of 4-8cm is selected and calcined in a mechanical shaft kiln. The calcining temperature is controlled at 950-1150°C for 12 hours to obtain active lime (CaO). The active lime (CaO) is digested by adding hot water at 45°C. The gray-water ratio is 1:5, and the coarse lime milk concentration is 14.50%. The digested coarse pulp is aged at 40-60°C for 24 hours, and then subjected to hydrocyclone separation and screening to obtain a refined emulsion for aging; the Ca(OH) is adjusted by adding water and heat exchange 2 The emulsion concentration is 10.5%, Ca(OH) 2 The temperature of the emulsion is 25°C, add sodium polyacrylate to the milk of lime, the molecular weight is 4000-5000, the dosage is 0.2%, after stirring evenly, add 0.5% of crystal form control agent sodium citrate and 0.5% of aluminum chloride, pump into 30m 3 Reactor, while feeding CO 2 Concentration of 28% kiln gas, kiln gas flow rate is 30m 3 / min; when reacting to PH=8, add water glass with a modul...

Embodiment 2

[0033] Select 8-12cm limestone and calcinate it in a mechanical shaft kiln. Control the calcining temperature at 950-1150°C for 24 hours to obtain active lime (CaO). The active lime (CaO) is digested by adding hot water at 50°C. The ratio of lime:water is 1:5.5, resulting in a crude milk of lime with a concentration of 13%. The digested coarse pulp is aged at 40-60°C for 12 hours, and then subjected to hydrocyclone separation and screening to obtain a refined emulsion for aging; the Ca(OH) is adjusted by adding water and heat exchange 2 Emulsion is 9.5%, Ca(OH) 2 The temperature of the emulsion is 22°C, add sodium polyacrylate into the lime milk, the molecular weight is 4000-5000, the dosage is 0.25%, after stirring evenly, then add the crystal form control agent sodium citrate 0.6%, EDTA-2Na0. Into 30m 3 Reactor, while feeding CO 2 Concentration of 30% kiln gas, kiln gas flow rate is 30m 3 / min; when reacting to PH=8.5, add water glass with a modulus of 2.8, add 5% accord...

Embodiment 3

[0035] Select 8-12cm limestone and calcinate it in a mechanical shaft kiln. Control the calcining temperature at 950-1150°C for 24 hours to obtain active lime (CaO). The active lime (CaO) is digested by adding hot water at 50°C. The ratio of lime:water is 1:5.5, resulting in a crude milk of lime with a concentration of 16%. The digested coarse pulp is aged at 40-60°C for 18 hours, and then subjected to hydrocyclone separation and sieving to obtain a refined emulsion for aging; adjust the Ca(OH) by adding water and exchanging heat 2 Emulsion is 9%, Ca(OH) 2 The temperature of the emulsion is 21°C, add sodium polyacrylate into the milk of lime, the molecular weight is 4000-5000, the dosage is 0.2%, after stirring evenly, add the crystal form control agent sodium citrate 0.6%, aluminum sulfate 1.0%, etc., pump Into 30m 3 Reactor, while feeding CO 2 Concentration of 30% kiln gas, kiln gas flow rate is 30m 3 / min; When the reaction reaches PH=8, add methyl silicate, add 3.5% ac...

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Abstract

The invention discloses a preparation method of special nanometer calcium carbonate for rubber. The main steps are: control the lime calcination temperature, digested gray-water ratio, digested temperature, and fine pulp aging time to obtain the active lime milk required for the production of nano-calcium carbonate; control the initial carbonization temperature and concentration of lime milk, and Add specific dispersants and crystal form control agents for carbonization in the early stage to obtain specific chain-shaped nano-calcium carbonate particles, and then add silicon source at the end of carbonization or after carbonization; control the calcium carbonate slurry at 60‑70 ° ​​C, add surfactant first For processing, the treated slurry is dehydrated and dried until the moisture is lower than 0.5%, and then depolymerized to obtain a modified nano-calcium carbonate dry powder, which is then added to a high-speed mixer, treated with a coupling agent, and depolymerized again to obtain Composite modified nano calcium carbonate. The nano-calcium carbonate prepared by the invention has good dispersibility, good compatibility with rubber substrates, good mechanical properties, and can be used as an excellent reinforcing filler for rubber.

Description

technical field [0001] The invention relates to the field of ultrafine inorganic powder manufacturing, and more specifically relates to a method for preparing nano-calcium carbonate special for rubber. Background technique [0002] Calcium carbonate is widely used as a filler in plastics, rubber, paint, paper and other industries because of its high quality and low price. With the development of science and technology, the demand for rubber products in all walks of life continues to expand, but the quality requirements are also more stringent. At present, carbon black and white carbon black are generally used as the main reinforcing agent for rubber products, and heavy calcium and ordinary light calcium are used as fillers. [0003] Some manufacturers also use a small amount of nano-calcium carbonate to replace carbon black and white carbon black. Although progress has been made, the effect is mediocre and there is still a lot of room for improvement. [0004] In recent ye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C08L9/06C08K13/06C08K9/10C08K9/06C08K3/26
Inventor 匡尹杰向枫涂敏周琼花陈敏李宇春
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY