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Preparation method of nanometer calcium carbonate applied to top-grade silicone adhesive

A nano-calcium carbonate, the technology of the manufacturing method, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult discharge of reaction heat, unsatisfactory crystal form of nano-calcium carbonate particles, poor dispersibility, etc., and achieves improved dispersibility. Effect

Inactive Publication Date: 2010-10-20
ENPING CITY YAN HUA CHEM INDAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of traditional nano-calcium carbonate generally includes limestone calcination-lime digestion reaction-carbonization reaction-surface treatment-dehydration drying-crushing and grading, etc. Considering technical and equipment reasons, the reaction heat generated by the current carbonization reaction process is difficult. Discharge, so there is a defect that the temperature is too high in the reaction process, which makes the crystal form of the generated nano-calcium carbonate particles not ideal, and the dispersion is not good. In addition, the surface treatment process of the nano-calcium carbonate product has not yet reflected the functional effect , the current nano-calcium carbonate products cannot meet the needs of high-grade silicone adhesives in terms of cohesiveness, elongation, and strength.

Method used

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  • Preparation method of nanometer calcium carbonate applied to top-grade silicone adhesive
  • Preparation method of nanometer calcium carbonate applied to top-grade silicone adhesive
  • Preparation method of nanometer calcium carbonate applied to top-grade silicone adhesive

Examples

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example 1

[0020] Example 1: at 8M 3 Add 5M to the reactor 3 Concentration of 8% Ca(OH) 2 Emulsion, add 100g sucrose and stir before the reaction to control the shape and particle size of the product. The initial temperature of the reaction is controlled at 12°C, and then 33% CO 2 Gas is carbonized, CO 2 The flow rate is 20m 3 / min, carbonized to a pH value of 10, and then added 3.75kg of ammonium bicarbonate to carbonize to a pH value of 7 to obtain a calcium carbonate slurry. The reaction heat generated during the carbonization reaction process is generally taken away by cooling water to ensure that the temperature of the reaction process is controlled , so that the particles have good dispersion.

[0021] Dissolve 1.04kg of NaOH and 10kg of stearic acid in water at 90°C for saponification. After the pH value is stable, add 12kg of palm oil and continue stirring for 30 minutes to make a surface treatment agent, and then add it to the calcium carbonate slurry. 30 minutes. After th...

example 2

[0024] Example 2: at 8M 3 Add 5M to the reactor 3 Concentration of 8% Ca(OH) 2 Emulsion, add 100g of sucrose and stir before the reaction, the initial temperature of the reaction is controlled at 18 ° C, and then the concentration of 28% CO 2 Gas is carbonized, CO 2 The flow rate is 30m 3 / min, carbonized to a pH value of 10, then added 2.72 kg of sulfuric acid, sulfuric acid is used to control the growth rate of the crystal plane, and then continued carbonization to a pH value of 7 to obtain a calcium carbonate slurry.

[0025] Dissolve 1.04kg of NaOH and 10kg of stearic acid in water at 90°C for saponification. After the pH is stable, add 12kg of palm oil and continue stirring for 30 minutes to make a surface treatment agent, then add it to the calcium carbonate slurry for 30 minutes minute. After the first surface treatment is completed, add 5kg of tallow fatty acid to the slurry, stir for 30 minutes, hydraulically filter, dry, and pulverize the treated carbonized slur...

example 3

[0029] Example 3: at 8M 3 Add 5M to the reactor 3 Concentration of 8% Ca(OH) 2 Emulsion, add 100g sucrose and stir before the reaction, the initial temperature of the reaction is controlled at 25°C, and then the concentration of 28% CO 2 Gas is carbonized, CO 2 The flow rate is 20m 3 / min, carbonized to a pH value of 10, then added 2.72kg of sulfuric acid, and then continued carbonization to a pH value of 7, to obtain calcium carbonate slurry.

[0030] Dissolve 1.04kg of NaOH and 10kg of stearic acid in water at 90°C for saponification. After the pH is stable, add 12kg of palm oil and continue stirring for 30 minutes to make a surface treatment agent, then add it to the calcium carbonate slurry for 30 minutes minute. After the first surface treatment is completed, add 5kg of tallow fatty acid to the slurry, stir for 30 minutes, hydraulically filter, dry, and pulverize the treated carbonized slurry to obtain uniformly dispersed nano-calcium carbonate powder.

[0031] Add ...

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Abstract

The invention discloses a preparation method of nanometer calcium carbonate applied to top-grade silicone adhesive, comprising the steps of calcining and assimilation reaction, carbonization reaction, surface treatment for the first time, surface treatment for the second time, dehydration, drying, crushing, grading, surface treatment for the third time, crushing for the second time, and the like. In the invention, by changing the initial temperature and the final temperature of the carbonization reaction, the reaction temperature is controlled, and the dispersibility of nanometer calcium carbonate granules is ensured. In addition, surface treatment is adopted for three times, and crushing is carried out for twice, thereby the dispersibility, the thixotropy, the caking property and the elongation of the product are improved by the three times of cladding treatment, and the generated nanometer calcium carbonate product is more suitable to be applied to top-grade silicone adhesive.

Description

technical field [0001] The invention relates to a nano-calcium carbonate manufacturing technology, in particular to a nano-calcium carbonate manufacturing method which can be applied to high-grade silicone glue. Background technique [0002] Silicone glue is mainly used to make various sealants. As the main functional filler of silicone glue, nano-calcium carbonate can have a good affinity with the glue when it is used in the glue, and can accelerate the crosslinking of the glue. Reaction greatly improves the thixotropy of the system, enhances the dimensional stability, improves the mechanical properties of the rubber, and achieves the dual functions of filling and reinforcement. At the same time, it can make the surface of the rubber material smooth and delicate. Not affected. The structure and properties of nano-calcium carbonate have a decisive influence on the product function of silicone glue, especially high-grade silicone glue has extremely high requirements for the ...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 江志荣陈国荣吴健松谢忠
Owner ENPING CITY YAN HUA CHEM INDAL