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A kind of surface treatment method of nano calcium carbonate

Active Publication Date: 2017-04-19
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, the current surface treatment technology of calcium carbonate is difficult to endow silicone sealants with excellent adhesion and weather resistance at the same time

Method used

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  • A kind of surface treatment method of nano calcium carbonate
  • A kind of surface treatment method of nano calcium carbonate
  • A kind of surface treatment method of nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dilute the milk of lime that has been refined and aged for 72 hours, adjust the specific gravity to 1.055, control the temperature at 23°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation chemical reaction, the kiln gas flow rate is 8m 3 / h, the volume content of carbon dioxide is 30%, when the pH of the reaction solution drops below 7.0, continue to pass through the kiln gas for 10 minutes, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 24.1m 2 / g

[0033] (2) Add the nano-calcium carbonate slurry obtained after carbonization into the reaction kettle, control the temperature to 85° C., and stir evenly.

[0034] (3) Add 3.5% (calculated on dry basis of calcium carbonate) surface treatment agent in the nano-calcium carbonate slurry obtained in step (2), and continue stirring for 60 min to complete the modification of nano-calcium carbonate...

Embodiment 2

[0038] (1) Dilute the milk of lime that has been refined and aged for 72 hours, adjust the specific gravity to 1.055, control the temperature at 23°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation chemical reaction, the kiln gas flow rate is 8m 3 / h, the volume content of carbon dioxide is 30%, when the pH of the reaction solution drops below 7.0, continue to pass through the kiln gas for 10 minutes, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 24.1m 2 / g

[0039] (2) Add the nano-calcium carbonate slurry obtained after carbonization into the reaction kettle, control the temperature to 85° C., and stir evenly.

[0040] (3) Add 2.5% (calculated on dry basis of calcium carbonate) surface treatment agent in the nano-calcium carbonate slurry obtained in step (2), and continue stirring for 60 min to complete the modification of nano-calcium carbonate...

Embodiment 3

[0044] (1) Dilute the milk of lime that has been refined and aged for 72 hours, adjust the specific gravity to 1.055, control the temperature at 23°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation chemical reaction, the kiln gas flow rate is 8m 3 / h, the volume content of carbon dioxide is 30%, when the pH of the reaction solution drops below 7.0, continue to pass through the kiln gas for 10 minutes, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 27.3m 2 / g

[0045] (2) Add the nano-calcium carbonate slurry obtained after carbonization into the reaction kettle, control the temperature to 85° C., and stir evenly.

[0046] (3) Add 3.5% (in calcium carbonate dry basis) surface treatment agent in step (2) gained nano-calcium carbonate slurry, continue stirring 60min and finish the modification of nano-calcium carbonate.

[0047] The saturated fatty aci...

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Abstract

The invention discloses a nano calcium carbonate surface treatment method which is as follows: diluting lime milk which is refined and aged for 72h, and transferring to a bubbling carbonization column; introducing kiln gas with the flow rate of 6-10m<3> / h, when the reaction liquid pH drops to below 7.0, continuing to introduce the kiln gas for carbonization for 10min, and after carbonation reaction is completed, controlling the nano calcium carbonate slurry specific surface area to 23-30m<2> / g. The nano calcium carbonate slurry temperature is controlled at 80 to 90 DEG C, after even stirring, a surfactant is added, and the modification of nano calcium carbonate is completed by continuing stirring for 60 to 90min. The highly active nano calcium carbonate prepared by the method is used as a filler for filling silicone sealant, the reinforcing effect is significantly increased, adhesion properties and weathering stability of the silicone sealant can be greatly improved; the method has the advantages of simple process, easy operation, suitability for industrial production, and good economic benefit and social benefit.

Description

technical field [0001] The invention relates to a surface treatment method of nano-calcium carbonate, in particular to a surface treatment method of nano-calcium carbonate capable of imparting good bonding performance and weather resistance to silicone sealants. [0002] technical background [0003] One-component room temperature vulcanizing silicone rubber reacts with moisture in the air to become an elastomer, which can act as an adhesive. Because of its excellent performance, it is widely used in construction, automobiles, electronics and other fields. The silicone sealants currently used in the market have poor adhesion and weather resistance. For the construction industry, silicone sealant plays an important structural role in glass curtain walls, because it connects glass to glass, glass to aluminum, and withstands wind, earthquake, self-weight, and temperature changes. Therefore, the bonding and weather resistance of silicone sealants should be improved to avoid qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/12C09J11/04C01F11/18B82Y30/00B82Y40/00
Inventor 莫冬丽朱勇颜干才谌业文
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD