Surface treatment method for nanometer calcium carbonate applied to fill silicone sealant

A nano-calcium carbonate, silicone sealant technology, applied in inorganic pigment treatment, chemical instruments and methods, dyed low molecular organic compound treatment and other directions, can solve the problems of unstable finished product performance, short storage period, etc. , The effect of improving adhesion and storage stability

Active Publication Date: 2016-03-16
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 silicone sealant prepared by this method has good light and heat resistance, water resistance and bonding strength, but its storage period is short and the performance of the finished product is unstable.

Method used

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  • Surface treatment method for nanometer calcium carbonate applied to fill silicone sealant
  • Surface treatment method for nanometer calcium carbonate applied to fill silicone sealant
  • Surface treatment method for nanometer calcium carbonate applied to fill silicone sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of surface treatment method that is applied to the nano-calcium carbonate of filling silicone sealant, comprises the following steps:

[0034] (1) Set the specific surface to 30m 2 / g of nano-calcium carbonate slurry is added to the reactor, stirred, and heated to 75°C to obtain nano-calcium carbonate suspension slurry;

[0035] (2) Slowly add a composite surface treatment agent composed of stearic acid and coconut oil to the nano-calcium carbonate suspension under stirring for a surface treatment. The amount added is 3.0% of the dry mass of calcium carbonate, and continue stirring for 15 minutes. Obtain the preliminary modified solution of nano-calcium carbonate;

[0036] The preparation method of the above-mentioned compound surface treatment agent: add stearic acid and coconut oil to the reaction kettle with a mass ratio of 3:1, then add sodium hydroxide with 15% stearic acid mass, and control it at 80°C for saponification reaction to obtain a compound surfa...

Embodiment 2

[0041] A kind of surface treatment method that is applied to the nano-calcium carbonate of filling silicone sealant, comprises the following steps:

[0042] (1) Set the specific surface to 23m 2 / g of nano-calcium carbonate slurry was added to the reactor, stirred, and heated to 60°C to obtain nano-calcium carbonate suspension slurry;

[0043] (2) Slowly add a composite surface treatment agent composed of palmitic acid and coconut oil to the nano-calcium carbonate suspension slurry under stirring for a surface treatment. The addition amount is 2.5% of the dry mass of calcium carbonate, and continue to stir for 20 minutes to obtain Nano-calcium carbonate preliminary modification solution;

[0044] The preparation method of the above-mentioned composite surface treatment agent: add palmitic acid and coconut oil to the reaction kettle with a mass ratio of 2:1, then add sodium hydroxide with 12% palmitic acid mass, and control the saponification reaction at 90°C. That is, the co...

Embodiment 3

[0049] A kind of surface treatment method that is applied to the nano-calcium carbonate of filling silicone sealant, comprises the following steps:

[0050] (1) Set the specific surface to 30m 2 / g of nano-calcium carbonate slurry was added to the reactor, stirred, and heated to 70°C to obtain nano-calcium carbonate suspension slurry;

[0051] (2) Slowly add a compound surface treatment agent composed of arachidic acid and coconut oil to the nano-calcium carbonate suspension under stirring for a surface treatment. The addition amount is 3.0% of the dry mass of calcium carbonate, and continue to stir for 20 minutes to obtain Nano-calcium carbonate preliminary modification solution;

[0052] The preparation method of the above-mentioned compound surface treatment agent: add arachidic acid and coconut oil to the reaction kettle with a mass ratio of 4:1, then add sodium hydroxide with 13% of the mass of arachidic acid, and control the saponification reaction at 95°C. That is, th...

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Abstract

A disclosed surface treatment method for nanometer calcium carbonate applied to fill a silicone sealant comprises the following steps: adding a nanometer calcium carbonate slurry into a reaction kettle, stirring and heating to 60-80 DEG C, so as to obtain a nanometer calcium carbonate suspending slurry; slowly adding a compound surfactant composed of saturated aliphatic acid and coconut oil into the nanometer calcium carbonate suspending slurry for first surface treatment; then slowly adding an alkylphenol polyoxyethylene ether dimeric surfactant for secondary surface treatment, so as to obtain a nanometer calcium carbonate modification solution; and performing dewatering, drying, crushing and sieving on the nanometer calcium carbonate modification solution, so as to obtain the nanometer calcium carbonate for filling the silicone sealant. The nanometer calcium carbonate obtained according to the surface treatment method possesses good dispersibility, hydrophobicity and relatively low oil absorption value, and is capable of improving the storage stability, mechanical properties, ageing resistance, photothermy resistance, oxidation resistance and other performances of the silicone sealant when being applied to fill the silicone sealant.

Description

technical field [0001] The invention relates to the field of preparation of inorganic materials, in particular to a surface treatment method for nanometer calcium carbonate applied to filling silicone sealants. Background technique [0002] As a new type of functional inorganic material, nano-calcium carbonate has ultra-fine particle size and high specific surface area so that it has quantum size effect, small size effect, surface effect and macroscopic quantum effect that ordinary inorganic fillers do not have. It is stable, easy to process and low in price, so it is widely used in industries such as rubber and plastics, coating ink, paper making and silicone sealants. However, the surface of nano-calcium carbonate without surface modification is lipophilic and hydrophobic, and it is difficult to disperse uniformly in the composite material; and the specific surface area is large, the surface energy is high, and the agglomeration between particles is easy to occur. Such def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/10C09J11/04
CPCC09C1/021C09C3/006C09C3/08C09C3/10C09J11/04
Inventor 黄海昌覃玲意朱勇刘旭增林誉盛
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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