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Preparation method of nano calcium carbonate used for weather proofing silicone sealant

A nano-calcium carbonate and sealant technology, applied in the directions of adhesive additives, dyed low-molecular-weight organic compounds, dyed high-molecular organic compounds, etc., can solve the problems of high modulus, poor processing performance, poor fluidity, etc. Low modulus, simple and feasible process, and the effect of reducing modulus

Active Publication Date: 2015-04-08
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calcium carbonate powder obtained by this method has a good dispersion effect and good thixotropy, but when applied to silicone glue, the fluidity is poor, the processability is not good, and the modulus of the sealant is too high after curing

Method used

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  • Preparation method of nano calcium carbonate used for weather proofing silicone sealant
  • Preparation method of nano calcium carbonate used for weather proofing silicone sealant
  • Preparation method of nano calcium carbonate used for weather proofing silicone sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.065, control the temperature at 20°C, and then transport it to the carbonation reaction kettle; enter the purified and cooled lime kiln gas for carbonation reaction, kiln gas The flow rate is 10m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops to 7.0, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 27.8m 2 / g;

[0034] Prepare the composite surface treatment agent of 4.0% (in calcium carbonate dry basis): wherein fatty acid is selected stearic acid for use, and its consumption is 80% of surface treatment agent total amount, and polyamide wax consumption is 20% of surface treatment agent total amount , hot water temperature is 95 ℃, and sodium hydroxide consumption is 14% of stearic acid total amount;

[0035] Transfer the carbonized slurry to the surface treatment tank, raise the te...

Embodiment 2

[0038] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.060, control the temperature at 23°C, and then transport it to the carbonation reaction kettle; pass it into the purified and cooled lime kiln gas for carbonation reaction, kiln gas The flow rate is 10m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops to 7.0, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 22.4m 2 / g;

[0039] Prepare the compound surface treatment agent of 3.0% (calcium carbonate dry basis): wherein stearic acid consumption is 60% of surface treatment agent total amount, oleic acid consumption is 5% of surface treatment agent total amount, polyamide wax consumption It is 35% of the total amount of surface treatment agent, the temperature of hot water is 95°C, and the amount of sodium hydroxide is 14% of the total amount of fatty acids;

[0040] Transfer the carboniz...

Embodiment 3

[0043] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.055, control the temperature at 20°C, and then transport it to the carbonation reaction kettle; enter the purified and cooled lime kiln gas for carbonation reaction, kiln gas The flow rate is 10m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops to 7.0, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 31.2m 2 / g;

[0044] Prepare the composite surface treatment agent of 4.5% (calcium carbonate dry basis): wherein stearic acid consumption is 50% of surface treatment agent total amount, lauric acid consumption is 20% of surface treatment agent total amount, polyamide wax consumption It is 30% of the total amount of surface treatment agent, the temperature of hot water is 95°C, and the amount of sodium hydroxide is 10% of the total amount of fatty acids;

[0045] Transfer the carbonized sl...

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Abstract

The invention discloses a preparation method of nano calcium carbonate used for a weather proofing silicone sealant, the proportion of lime milk aged for 36-72h is adjusted to 1.055-1.070, the temperature is controlled between 18 to 28 DEG C, lime kiln gas is introduced into for carbonation reaction, the lime kiln gas flow is controlled to 6-10m<3> / h, the carbon dioxide volume content is 25-40%, when the reaction solution pH is reduced to 7, the reaction solution is heated to 50 to 90 DEG C, 12-20g of fatty acid saponified solution and polyamide wax compounded surface treatment agent is added for coating, and after 60-120min of stirring, the product is obtained by completion of surface modification, dehydration, drying, crushing and grading. The nano calcium carbonate prepared by the method can significantly shorten surface drying time, reduce the curing silicone sealant modulus, and improve the filling silicone sealant thixotropy, processing and adhesion properties, and the process is easy and feasible, low in production cost, and good in economic benefit.

Description

field of invention [0001] The invention relates to an active nano-calcium carbonate and a preparation method thereof, in particular to a preparation method of nano-calcium carbonate for silicone weather-resistant sealant. Background technique [0002] The building curtain wall is composed of metal structure and glass or other plates, and is a building envelope structure that does not bear the load of the main structure. In order to ensure that the curtain wall has excellent and durable watertight and airtight performance and cohesion, silicone sealants are widely used in the bonding or sealing of building curtain walls because of their fast curing, good elasticity and good cohesion. [0003] The sealants in building curtain walls mainly include structural adhesives and weather-resistant adhesives. Silicone structural building adhesives are used to firmly and durably bond curtain walls to metal framing, while silicone weather sealants are used to seal expansion joints betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/10C09J11/04
Inventor 熊文朱勇吴娜陆永芳
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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