Preparation method of PVC special-purpose functional filler superfine active calcium carbonate with low oil absorption

A technology of activated calcium carbonate and activated calcium carbonate powder, which is applied in fibrous fillers, dyeing low-molecular organic compound treatment, dyeing physical treatment, etc., can solve the problems of high oil absorption value and large particle size, and achieve low oil absorption value and particle size. The effect of small size and high production efficiency

Inactive Publication Date: 2012-10-17
CHIZHOU CELT NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a preparation method of ultrafine active calcium carbonate, a special functional filler for PVC with low oil absorption value, to overcome the serious agglomeration, large particle size, and low oil absorption value in the production of light active calcium carbonate in the prior art. advanced questions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 15 cubic meters of 13% calcium hydroxide slurry is added in the bubbling carbonization kettle, and the kiln gas is passed into the kiln gas for carbonization, wherein the volume percentage concentration of carbon dioxide gas in the kiln gas is 30%, and the initial carbonization temperature The temperature is 45°C, the flow rate of the kiln gas is controlled to be 30 cubic meters per minute, and the pH value of the slurry drops below 7.0 after carbonization for 1 hour and 35 minutes, which is the end point of carbonization, and the temperature of the calcium carbonate slurry rises to 70°C.

[0025] The carbonized slurry is input from the bottom of the vertical bead mill by the feed pump for grinding, and the ground and dispersed slurry flows out from the top separator into the slurry mixing tank.

[0026] Heat 800 kg of water in a 1.5 cubic meter coating agent synthesis kettle, add 52 kg of stearic acid, continue to heat and keep warm at 90 ° C, and add liquid caustic sod...

Embodiment 2

[0030] Similar to Example 1, adding weight percent concentration in the bubbling type carbonization still is 15 cubic meters of 16% calcium hydroxide slurry, the initial carbonization temperature is 43 ℃, and the flow rate of the control kiln gas is 35 cubic meters per minute, After 1 hour and 40 minutes of carbonization, the pH value of the slurry drops below 7.0, which is the end point of carbonization, and the temperature of the calcium carbonate slurry rises to 70°C.

[0031] The carbonized slurry is input from the bottom of the vertical bead mill by the feed pump for grinding, and the ground and dispersed slurry flows out from the top separator into the slurry mixing tank.

[0032] Add 82 kg of stearic acid to hot water and dissolve it into an emulsion. After being mixed with the grinding slurry, it is pumped into the filter storage tank by an emulsification pump, and finally filtered and dried to obtain the invented product.

[0033] The particle size of calcium carbona...

Embodiment 3

[0035] Similar to Example 1, adding weight percent concentration in the bubbling type carbonization still is 15 cubic meters of 11% calcium hydroxide slurry, the initial carbonization temperature is 43 ℃, and the flow rate of the control kiln gas is 30 cubic meters per minute, After 1 hour and 25 minutes of carbonization, the pH value of the slurry drops below 7.0, which is the end point of carbonization, and the temperature of the calcium carbonate slurry rises to 70°C.

[0036] The carbonized slurry is input from the bottom of the vertical bead mill by the feed pump for grinding, and the ground and dispersed slurry flows out from the top separator into the slurry mixing tank.

[0037] Add 42 kg of stearic acid to hot water and dissolve it into an emulsion. After being mixed with the grinding slurry, it is pumped into the filter storage tank by an emulsification pump, and finally filtered and dried to obtain the invented product.

[0038] The particle size of calcium carbona...

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Abstract

The invention discloses a preparation method of a PVC special-purpose functional filler superfine active calcium carbonate with low oil absorption. The method comprises the following main steps of: allowing a kiln gas to enter a high-density calcium hydrate slurry for rapid carbonization; grinding by the adoption of a vertical type bead mill; mixing the grounded slurry with a saponified eleaostearic acid emulsion; synchronously completing dispersion of calcium carbonate and surface coating under the action of high shear force by an emulsification pump; and finally filtering and drying to obtain the product of the invention. The product is characterized in that its particle size distribution is 0.8-1.5 microns; activation grade is greater than 98%; oil absorption is less than 18 g / 100 g CaCO3; and there is no agglomerate phenomena. In addition, the product can be used as a high-grade PVC special-purpose functional filler.

Description

technical field [0001] The invention relates to a preparation method of ultrafine active calcium carbonate, in particular to a preparation method of ultrafine active calcium carbonate as a special functional filler for PVC with low oil absorption value. Background technique [0002] PVC is a general-purpose plastic with a wide range of uses. PVC is the abbreviation of polyvinyl chloride material. It is made of polyvinyl chloride resin as the main raw material, adding an appropriate amount of anti-aging agent, modifier, etc. Materials made by other processes. PVC material has the characteristics of light weight, heat insulation, heat preservation, moisture resistance, flame retardancy, and simple construction. It has various specifications, colors, and patterns, and is very decorative. Its average consumption is second only to polyethylene. In the past, in the processing of PVC, in order to reduce the production cost and improve the dimensional stability, impact strength and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C08L27/06C08K9/10C08K9/04C08K3/26
Inventor 徐宇坤顾庆雷
Owner CHIZHOU CELT NANO TECH
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