Preparation method of superfine active calcium carbonate functional filler special for PVC

A technology of active calcium carbonate and functional fillers, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of high oil absorption value and poor dispersion, and achieve the effects of low oil absorption value, fast carbonization speed and low production cost

Inactive Publication Date: 2013-04-03
CHIZHOU CELT NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is to provide a preparation method of ultrafine activated calcium carbonate, a special functional filler for PVC, to overcome the problems of serious agglomeration, poor dispersion and high oil absorption value in the prior art when polymer emulsion is coated with calcium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 8 cubic meters of 16% calcium hydroxide slurry in a bubbling carbonization kettle of 10 cubic meters, and feed into kiln gas for carbonization, wherein the volume percent concentration of carbon dioxide gas in the kiln gas is 30%. Control the kiln gas flow rate to 14 cubic meters per minute, and after carbonization for 1 hour and 20 minutes, the pH value of the slurry drops below 7.0, which is the end point of carbonization.

[0030] Transport the carbonized slurry to an intermediate storage tank of 10 cubic meters, add 350 kg of 600-mesh heavy calcium carbonate at the same time, stir and mix evenly, and then input it from the bottom of the vertical bead mill for grinding by the feeding pump, and at the same time The ground and dispersed slurry flows out from the top separator into the coating tank. At the same time, 200 kg of styrene-acrylate emulsion (40% solid content) produced by Zhejiang Xinli Chemical Co., Ltd. was added to the coating kettle and mixed...

Embodiment 2

[0033] Similar to Example 1, the synthetic light calcium carbonate slurry is transported to an intermediate storage tank of 10 cubic meters, and 250 kilograms of 600 mesh heavy calcium carbonate are added at the same time, stirred and mixed evenly, and then fed from the vertical bead mill by a feeding pump The bottom of the machine is input for grinding, and the slurry after grinding and dispersion flows out from the top separator into the coating tank. At the same time, add 100 kg of styrene-acrylate emulsion (40% solid content) and 100 kg vinyl acetate-ethylene polymer emulsion (38% solid content) produced by Zhejiang Xinli Chemical Co., Ltd. After uniformity, under the action of high-shear emulsification of the homogeneous pump, the dispersion of calcium carbonate and the surface coating are completed simultaneously. The coating treatment is 1 hour, and finally the invented product is obtained by filtration and drying.

[0034] The particle size of calcium carbonate...

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PUM

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Abstract

The invention discloses a preparation method of a superfine active calcium carbonate functional filler special for PVC. The method includes the main steps of: introducing kiln gas into a high concentration calcium hydroxide slurry to conduct rapid carbonization, then adding heavy calcium carbonate powder accounting for 20-30% of the weight of synthetic calcium carbonate to prepare a mixed slurry of calcium carbonate, employing a vertical bead mill to perform grinding, mixing the grinded slurry with a high polymer emulsion, and under the high shear emulsification action of a homogenization pump, making calcium carbonate dispersion and high polymer emulsion cladding finished synchronously, finally carrying out filtration and drying, thus obtaining the product. The prepared product has a particle size distribution in the range of 1.0-1.5 micrometers, an activation degree over 99%, an oil absorption value less than 15g / 100gCaCO3, and is free of agglomeration phenomenon, thus being able to serve as a functional filler special for high-end PVC.

Description

technical field [0001] The invention relates to the field of preparation of ultrafine active calcium carbonate, in particular to a preparation method of ultrafine active calcium carbonate as a special functional filler for PVC. Background technique [0002] PVC is a general-purpose plastic with a wide range of uses, and its average consumption is second only to polyethylene. During the processing of PVC, in order to reduce the production cost and improve the dimensional stability, impact strength and toughness of PVC products, inorganic powder calcium carbonate is usually added to improve the plasticizing performance. However, after adding calcium carbonate powder, not only the processing performance is reduced, but also the physical and chemical properties of the product are reduced. In order to improve the performance of PVC products, in the manufacturing process, calcium carbonate after activation treatment is usually added, which can significantly improve the ph...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 顾庆雷徐宇坤顾菲菲孟钧林顾宗军倪伯祥高健健曹继勇张小桐陶沈杰
Owner CHIZHOU CELT NANO TECH
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