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Preparation method of activated calcium carbonate for high-filling-capacity bi-component silicone adhesive

A technology with active calcium carbonate and high filling content, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, non-polymer adhesive additives, etc., can solve the problem of unfavorable products that are difficult to meet the comprehensive needs of industrial production and application markets Quality stability, calcium carbonate flocculation and other issues, to achieve excellent fluidity, shorten the aging time, slow down the effect of the greenhouse effect

Active Publication Date: 2020-04-14
ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain products with large particle sizes, the accelerated aging agent used in this method has the risk of calcium carbonate flocculation, which is not conducive to the control of product quality stability, and the aging efficiency is still low
[0010] Generally speaking, heating aging is an effective method for preparing large-sized cubic calcium carbonate, but there are still problems such as low aging efficiency, high production energy consumption, and unstable production, which are difficult to meet the needs of industrial production and application markets. Comprehensive needs

Method used

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  • Preparation method of activated calcium carbonate for high-filling-capacity bi-component silicone adhesive
  • Preparation method of activated calcium carbonate for high-filling-capacity bi-component silicone adhesive
  • Preparation method of activated calcium carbonate for high-filling-capacity bi-component silicone adhesive

Examples

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Effect test

Embodiment 1

[0035] A preparation method of active calcium carbonate for high-filling two-component silicone rubber, comprising the steps of:

[0036](1) The limestone is crushed by a jaw crusher to a size of 2~3cm, calcined at 1100°C for 400 minutes to obtain quicklime, and then the quicklime and water are digested according to the gray-to-water mass ratio of 1:11 to obtain lime slurry, lime Pass the slurry through a 100-mesh sieve to remove waste residue, adjust the solid content of the lime slurry to 10.5%, and place the lime slurry for 48 hours for aging;

[0037] (2) Take 15kg of lime slurry and send it to the carbonation reaction tower, start the freezing cycle, adjust the temperature of the lime slurry to 29°C, add 1.5g of sucrose, start the stirring and freezing cycle, and when the system temperature reaches 29°C, turn off the freezing cycle and adjust The stirring rate is 1500r / min, and the mixed gas containing carbon dioxide is introduced to start the reaction. The carbon dioxide...

Embodiment 2

[0043] A preparation method of active calcium carbonate for high-filling two-component silicone rubber, comprising the steps of:

[0044] (1) The limestone is crushed by a jaw crusher to a size of 2~3cm, calcined at 1250°C for 350 minutes to obtain quicklime, and 2kg of quicklime is added to tap water at 25°C at one time according to the mass ratio of 1:11, and stirred for 20 minutes Finally, the lime slurry is passed through a 100-mesh sieve to remove waste residue, the solid content of the lime slurry is adjusted to 11.5%, and the lime slurry is aged for 48 hours;

[0045] (2) Take 15kg of lime slurry and send it to the carbonation reaction tower, start the freezing cycle, adjust the temperature of the lime slurry to 26°C, add 1.5g of sucrose, start the stirring and freezing cycle, and when the system temperature reaches 26°C, turn off the freezing cycle and adjust The stirring rate is 2000r / min, and the mixed gas containing carbon dioxide is introduced to start the reaction...

Embodiment 3

[0050] A preparation method of active calcium carbonate for high-filling two-component silicone rubber, comprising the steps of:

[0051] (1) The limestone is crushed by a jaw crusher to a size of 2~3cm, and calcined at 1150°C for 500 minutes to obtain quicklime. Add 2kg of quicklime to tap water at 25°C at one time according to the mass ratio of 1:10, and stir for 20 minutes. Finally, the lime slurry is passed through a 100-mesh sieve to remove waste residue, the solid content of the lime slurry is adjusted to 12.5%, and the lime slurry is aged for 24 hours;

[0052] (2) Take 15kg of lime slurry and send it to the carbonation reaction tower, start the freezing cycle, adjust the temperature of the lime slurry to 28°C, add 1.5g of sucrose, start the stirring and freezing cycle, and when the system temperature reaches 28°C, turn off the freezing cycle and adjust The stirring rate is 1500r / min, and the mixed gas containing carbon dioxide is introduced to start the reaction, and t...

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Abstract

The invention discloses a preparation method of activated calcium carbonate for a high-filling-capacity bi-component silicone adhesive. The method comprises the following steps: preparing nano calciumcarbonate with a specific surface area of 20-25m <2> / g and a cube-like morphology through a bubbling carbonation reaction tower; adding a morphology modifier for heating and aging; meanwhile, supplementing lime slurry for low-speed carbonation; increasing a calcium carbonate source to effectively accelerate the re-crystallization of calcium carbonate and the crystal growth rate; finally, using sodium stearate to carry out a surface treatment and modification to obtain activated calcium carbonate, which is large in particle size and regular in morphology and has a cube-like specific surface area of 7-12 m <2> / g. The filling amount of calcium carbonate in colloid is effectively increased, and the bi-component silicone adhesive has excellent fluidity, thixotropy and mechanical properties. According to the method, heating aging and low-speed carbonation are combined to generate a synergistic effect, so that the aging time is effectively shortened, the production efficiency is improved, the carbonation tail gas can be effectively recycled, the emission of carbon dioxide is reduced, and the energy consumption and the production cost are reduced.

Description

technical field [0001] The invention relates to the technical field of calcium carbonate preparation, in particular to a method for preparing active calcium carbonate for high-filling two-component silicone rubber. Background technique [0002] Silicone building sealant (commonly known as silicone glue, the same below) is an important component of silicone polymer materials. It can be cured into elastic colloid at room temperature by contacting moisture in the air. It is easy to use. In addition to its excellent properties such as high and low temperature resistance, weather aging resistance, and high electrical insulation, silicon materials also have the characteristics of good adhesion to various substrates and strong resistance to displacement. It has developed into an important sealing material for modern architectural decoration. According to the curing method, silicone adhesive can be divided into two categories: one-component (RTV-1) and two-component (RTV-2), among w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C08K3/26C09J129/14C09J11/04
CPCC01F11/181C08K3/26C09J129/14C09J11/04C08K2003/265C01P2004/38C01P2006/12
Inventor 梁力戈朱勇杨爱梅方贵坜文庆福黄辉亮范勇波
Owner ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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