Surface modification method of anti-oxidation nano-calcium carbonate for silicone sealant

A technology of nano-calcium carbonate and silicone sealant, which is applied in the direction of chemical instruments and methods, adhesives, non-polymer adhesive additives, etc. In order to solve the problem of poor anti-oxidation property of additives, achieve good thixotropic performance and processing performance, low production cost and less agglomeration

Active Publication Date: 2018-09-14
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses unsaturated fatty acid to modify the surface of nano-calcium carbonate, and the modifier has poor oxidation resistance, which is difficult to meet the needs of filling medium and high-grade silicone sealants.
[0007] In summary, the existing nano-calcium carbonate surface modification technology is difficult to meet the needs of filling high oxidation resistance silicone glue

Method used

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  • Surface modification method of anti-oxidation nano-calcium carbonate for silicone sealant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Nano-calcium carbonate slurry is processed, and the processing method is as follows:

[0032] The newly prepared pH is 6.8, BET specific surface area is 25.1m 2 / g, mass concentration is 10% nano-calcium carbonate suspension is added in the reaction tower, high-speed stirring, after mixing, pass into steam heating temperature to 80 ℃, and constant temperature; Then add 2.5% (calcium carbonate dry basis) fatty acid Mixed saponification solution with iron-sodium diethylenetriaminepentaacetate complex, wherein the mass ratio of fatty acid to iron-sodium diethylenetriaminepentaacetate complex is 9:1, the fatty acid is stearic acid, and the saponification agent is selected Sodium hydroxide, its addition is 17% of the total weight of fatty acid and diethylene triamine pentaacetate ferric-sodium complex, stirred for 40 minutes, stopped steam heating, squeezed the treated nano-calcium carbonate slurry, and entered the chain Drying treatment with a dryer, the moisture content o...

Embodiment 2

[0034] Nano-calcium carbonate slurry is processed, and the processing method is as follows:

[0035] The newly prepared pH is 6.9, BET specific surface area is 30.2m 2 / g, the nanometer calcium carbonate suspension that mass concentration is 10% is added in the reaction tower, stirs at a high speed, after mixing, feeds steam heating temperature to 80 ℃, and constant temperature; Then add 3.0% (calcium carbonate dry basis) fatty acid Mixed saponification solution with iron-sodium diethylenetriaminepentaacetate complex, wherein the mass ratio of fatty acid to iron-sodium diethylenetriaminepentaacetate complex is 9:1, the fatty acid is stearic acid, and the saponification agent is selected Sodium hydroxide, its addition is 17% of the total weight of fatty acid and diethylene triamine pentaacetate ferric-sodium complex, stirred for 40 minutes, stopped steam heating, squeezed the treated nano-calcium carbonate slurry, and entered the chain Drying treatment with a dryer, the moistu...

Embodiment 3

[0037] Nano-calcium carbonate slurry is processed, and the processing method is as follows:

[0038] The newly prepared pH is 6.8, BET specific surface area is 34.7m 2 / g, the nanometer calcium carbonate suspension that mass concentration is 10% is added in the reaction tower, stirs at a high speed, after mixing, feeds steam heating temperature to 80 ℃, and constant temperature; Then add 3.5% (calcium carbonate dry basis) fatty acid Mixed saponification solution with iron-sodium diethylenetriaminepentaacetate complex, wherein the mass ratio of fatty acid to iron-sodium diethylenetriaminepentaacetate complex is 9:1, the fatty acid is stearic acid, and the saponification agent is selected Sodium hydroxide, its addition is 17% of the total weight of fatty acid and diethylene triamine pentaacetate ferric-sodium complex, stirred for 40 minutes, stopped steam heating, squeezed the treated nano-calcium carbonate slurry, and entered the chain Drying treatment with a dryer, the moistur...

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Abstract

The invention discloses a surface modification method of anti-oxidation nanometer calcium carbonate used for a silicone sealant. The method comprises the following steps: 1, preparing a material: preparing a nanometer calcium carbonate slurry; 2, carrying out surface treatment: adding fatty acid and diethylenetriaminepentaacetic acid ferric-sodium complex mixed saponification liquor to the nanometer calcium carbonate slurry, and stirring to prepare a modified nanometer calcium carbonate slurry; 3, dehydrating and drying: carrying out dehydrating and drying treatment on the modified nanometer calcium carbonate slurry; and 4, crushing the obtained material to obtain a nanometer calcium carbonate product. The nanometer calcium carbonate product modified through the method has good compatibility to a silicone adhesive system, and a filled sealant has good mechanical strength and very good anti-oxidation characteristic. The product has the advantages of good dispersibility, less agglomeration, good thixotropy and processability, and effective increase of the tensile strength and the elongation at break of the silicone sealant. The above preparation method has the advantages of simplicity, low production cost and good economic benefit.

Description

technical field [0001] The invention relates to the field of nano-calcium carbonate, in particular to a method for surface modification of oxygen-resistant nano-calcium carbonate for silicone sealants. Background technique [0002] Calcium carbonate powder is widely used in plastics, rubber and coating industries as a filling modification material, which can improve the strength, wear resistance, heat resistance and dimensional stability of the composite material, and reduce the cost of the product. In the silicone sealant industry, nano-calcium carbonate is the most commonly used inorganic powder reinforcing filler. [0003] Nano-calcium carbonate usually uses fatty acids or their salts as surface treatment agents, and it is difficult to use fatty acid (salt) modified CaCO3 alone to meet the anti-oxidation performance of filled silicone sealants, especially some unsaturated fatty acids. Saturated bonds, after filling the silicone sealant, the unsaturated bonds are easily d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C09J11/04C09J183/04
CPCC01P2006/12C08K3/26C08K9/04C08K2003/265C08K2201/011C09C1/021C09C3/006C09J11/04C09J183/04
Inventor 谌业文朱勇颜干才罗元庆
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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