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A kind of preparation method of nano-calcium carbonate for stone building sealant

A nano-calcium carbonate and sealant technology, used in adhesives, polyether adhesives, non-polymer adhesive additives, etc., can solve the problems of hollowing, low strength, shedding, etc., and improve dispersibility and fluidity. , The effect of improving temperature resistance and corrosion resistance, and low production cost

Active Publication Date: 2020-09-08
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stone glue prepared by using unsaturated polyester resin may have serious problems such as hollowing, falling off, and low strength during use.

Method used

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  • A kind of preparation method of nano-calcium carbonate for stone building sealant
  • A kind of preparation method of nano-calcium carbonate for stone building sealant

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] Preparation of nano calcium carbonate suspension:

[0031] Limestone is put into the shaft kiln and calcined at 1200°C for 4 hours to obtain quicklime; quicklime and 80°C water are fully digested to obtain slaked lime slurry; slaked lime slurry is sieved and diluted with water to Ca(OH) 2 The solid content is 11-13%, and the freezing temperature is controlled at 20±5°C; CO2 with a volume concentration of 33% is introduced 2 Carry out bubbling carbonization reaction until the pH of the system is less than or equal to 8.0 to obtain nanometer calcium carbonate suspension. The dry powder body specific surface area of ​​the nano-calcium carbonate slurry used in the embodiment of the present invention is 35-40m 2 / g, the crystal particles have a cubic-like regular shape, and the particle size is controllable.

Embodiment 1

[0033] A preparation method for nano-calcium carbonate for stone building sealant, comprising the steps of:

[0034] (1) The newly prepared pH=6.8, BET specific surface area is 35.5m 2 / g, the nanometer calcium carbonate suspension that mass concentration is 10% adds in the reactor and stirs, passes into steam and heats material to 75 ℃; Hydroxyl-terminated polysiloxane saponification solution, wherein the saponification agent is sodium hydroxide, the saponification agent addition is 13% of dodecyl-modified hydroxyl-terminated polysiloxane, the concentration of the saponification solution is 6%, heating and stirring for 30 minutes, Obtain modified nano-calcium carbonate slurry;

[0035] (2) Carry out vacuum dehydration and drying treatment to the modified nano-calcium carbonate slurry, and crush and sieve to control the water content of the powder to ≤0.3%, then add it to a mixer for heating and stirring, and when the temperature of the material rises to 85°C, add 0.5% (Base...

Embodiment 2

[0038] A preparation method for nano-calcium carbonate for stone building sealant, comprising the steps of:

[0039] (1) The newly prepared pH=6.8, BET specific surface area is 40.5m 2 / g, the nanometer calcium carbonate suspension that mass concentration is 10% adds in the reactor and stirs, passes into steam and heats material to 75 ℃; Hydroxyl-terminated polysiloxane saponification solution, wherein the saponification agent is sodium hydroxide, the saponification agent addition is 15% of the total weight, heating and stirring for 30min, the concentration of the saponification solution is 5%, and the modified nano-calcium carbonate slurry is obtained;

[0040] (2) Carry out vacuum dehydration and drying treatment to the modified nano-calcium carbonate slurry, and crush and sieve to control the water content of the powder to ≤0.3%, then add it to a mixer for heating and stirring, and when the temperature of the material rises to 80°C, add 0.7% (Based on calcium carbonate dry...

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Abstract

The invention discloses a preparation method of nano calcium carbonate used for a building sealant for stone. The preparation method comprises the following steps: adding a dodecyl modified hydroxyl-terminated polysiloxane saponification liquid into a nano calcium carbonate suspension, and performing heating and stirring to obtain modified nano calcium carbonate slurry; performing vacuum dehydration on the modified nano calcium carbonate slurry, performing drying treatment, performing crushing, performing sieving, adding the sieved material into a stirring machine, performing heating and stirring, when the temperature of the material is raised to 80-90 DEG C, adding a mixed modifying agent composed of dimethyl silicone oil and silane coupling agent 3-octanoylsulfanyl-1-propyltriethoxysilane, continuing stirring for secondary surface treatment, when the temperature of the material is raised to 100-110 DEG C, stopping stirring, performing cooling, and discharging the material; and afterthe material is discharged, performing re-crushing, and performing re-sieving to obtain the nano calcium carbonate product used for the building sealant for the stone. The nano calcium carbonate prepared by the method has better compatibility with a silane modified polyether stone adhesive system, can effectively improve construction performance of the system, and can significantly improve the cohesiveness and tensile strength of the silane modified polyether stone adhesive.

Description

technical field [0001] The invention relates to the technical field of nano-calcium carbonate, in particular to a preparation method of nano-calcium carbonate for stone building sealant. Background technique [0002] In the field of modern architecture, in order to pursue the beauty and safety of buildings, and at the same time meet the environmental requirements of health and environmental protection, people are more and more inclined to choose natural stone, man-made panels and various composite stone decorative panels as the interior and exterior decoration of buildings. surface decoration materials. After years of rapid development of decorative stone in China, the annual output, consumption and import and export volume of stone are among the top in the world. China has become a big country in the production and use of stone curtain walls. [0003] In building wall decoration, stone products have gradually eliminated the traditional cement bonding method, and more and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J11/04C09J171/02
CPCC08K2003/265C08K2201/011C08L2205/025C09J11/04C09J171/02C08L71/02C08K13/06C08K9/08C08K9/06C08K3/26
Inventor 陈霞朱勇黄本卫方贵坜李仁才陆初典
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD