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Preparation method for submicron active calcium carbonate special for PVC and with low oil absorption value

A technology of activated calcium carbonate and oil absorption value, applied in the direction of calcium carbonate/strontium/barium, nanotechnology for material and surface science, nanotechnology, etc., to achieve the effect of good fluidity, low oil absorption value, and increased filling amount

Active Publication Date: 2014-04-30
WUHU ZHUOYUE NANO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the product itself exists in the form of large particles of agglomerates, with high oil absorption value, which makes the surface of the finished product rough, poor gloss, poor toughness and other weaknesses

Method used

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  • Preparation method for submicron active calcium carbonate special for PVC and with low oil absorption value

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a stirring jacketed reactor of 1 cubic meter, add 0.9 cubic meters of calcium hydroxide slurry with a concentration of 7% by weight, add 0.4 kilograms of sucrose, and pass through kiln gas for carbonization, wherein the amount of carbon dioxide gas in the kiln gas The volume percentage concentration is 28%, the carbonization temperature is controlled at 27°C to 30°C, the flow rate of the kiln gas is 0.7 cubic meters per minute, and the carbonization takes 22 minutes. Minutes, the pH value of the slurry drops below 7.0, which is the end point of carbonization.

[0025] Add 40 kg of water and 4.0 kg of stearic acid to the coating agent synthesis kettle, keep the temperature at 90°C, and simultaneously add liquid caustic soda until the pH is 13, so that the stearic acid is saponified into an emulsion in hot water.

[0026] After mixing the stearic acid emulsion and the calcium carbonate slurry, the mixed slurry is heated to 80°C, and coated for 20 minutes under the high...

Embodiment 2

[0029] Similar to Example 1, 0.9 cubic meters of calcium hydroxide slurry with a weight percentage concentration of 5% was added to the reactor, 0.5 kg of sucrose was added, and kiln gas was passed into for carbonization, and the carbonization temperature was controlled to be 27°C to 30°C. The flow rate of kiln gas is 0.5 cubic meters per minute, carbonization takes 16 minutes, and the flow rate of kiln gas is continued to be 1.0 cubic meters per minute, carbonization takes 55 minutes, and the pH value of the slurry drops below 7.0, which is the end point of carbonization.

[0030] Add 40 kg of water and 2.5 kg of stearic acid to the coating agent synthesis kettle, keep the temperature at 90°C, and simultaneously add liquid caustic soda until the pH is 13, so that the stearic acid is saponified into an emulsion in hot water.

[0031] After mixing the stearic acid emulsion and the calcium carbonate slurry, the mixed slurry is heated to 80°C, and coated for 20 minutes under the h...

Embodiment 3

[0034] Similar to Example 1, 0.9 cubic meters of calcium hydroxide slurry with a concentration of 6% by weight was added to the reaction kettle, 0.6 kg of sucrose was added, and kiln gas was introduced to carry out carbonization, and the carbonization temperature was controlled to be 27°C to 30°C. The flow rate of kiln gas is 0.6 cubic meters per minute, carbonization takes 19 minutes, and the flow rate of kiln gas is continued to be 1.2 cubic meters per minute, and carbonization takes 60 minutes. The pH value of the slurry drops below 7.0, which is the end point of carbonization.

[0035] Add 40 kg of water and 2.8 kg of stearic acid to the coating agent synthesis kettle, keep the temperature at 90°C, and simultaneously add liquid caustic soda until the pH is 13, so that the stearic acid is saponified into an emulsion in hot water.

[0036] After mixing the stearic acid emulsion and the calcium carbonate slurry, the mixed slurry is heated to 80°C, under the action of the high ...

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Abstract

The invention discloses a preparation method for submicron active calcium carbonate special for PVC and with low oil absorption value. The preparation method comprises the main steps: preparing a solution of a refined calcium hydroxide slurry with a weight percentage of 5-7%, adding a crystal-form controlling agent cane sugar accounting for 0.4-0.8% by weight of calcium hydroxide, introducing kiln gas containing carbon dioxide with a concentration of 25% or more, controlling the temperature of the reaction slurry at 27-30 DEG C for carbonization, when the carbonization rate is 15-25%, stopping cooling water, continuing to introduce kiln gas for normal-temperature carbonization, wherein the carbonization terminal point is that the pH value of the slurry is less than 7; then heating the slurry to 80 DEG C, adding a saponification emulsion of stearic acid accounting for 2.5-4.5% by weight of calcium carbonate, and under the effect of high shearing force of an emulsification pump, synchronously finishing dispersing and surface cladding of the calcium carbonate slurry; and finally performing filtering, drying and depolymerizing on the slurry to obtain the PVC special-purpose low-oil-absorption-value submicron active calcium carbonate product with the particle size of 200-400 nm and the oil absorption value of 16-18.

Description

Technical field: [0001] The invention relates to a preparation method of active calcium carbonate, in particular to a preparation method of submicron active calcium carbonate special for PVC with low oil absorption value. Background technique: [0002] PVC products are made of polyvinyl chloride resin as the main raw material, adding an appropriate amount of anti-aging agents, modifiers and other additives, and undergoing processes such as mixing, calendering, and vacuum blistering. PVC products have the characteristics of light weight, heat insulation, heat preservation, moisture resistance, flame retardancy, and simple construction. They have various specifications, colors, and patterns, and are very decorative. Their average consumption is second only to polyethylene plastics. Generally, during the processing of PVC products, in order to reduce production costs and improve the dimensional stability and impact strength of PVC products, inorganic powder calcium carbonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00
Inventor 顾达张和庆朱士洲邵小保张顺帆陈宁史韦倪春慧
Owner WUHU ZHUOYUE NANO NEW MATERIALS
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