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Preparation method of nano-grade calcium carbonate

A nano-calcium carbonate, slurry technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of poor dispersibility, poor reinforcement, insufficient gloss, etc., and achieve high reinforcement and high dispersion. Effect

Inactive Publication Date: 2012-06-13
曾庆铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, when the nano-calcium carbonate produced by the prior art is used as a reinforcing filler, if the particle size of the nano-calcium carbonate is made small, although the reinforcing property has been improved, the dispersibility is relatively poor, and the nano-calcium carbonate produced with such There are fine particles on the surface of the sealant, and the gloss is not enough; if the particle size of nano-calcium carbonate is enlarged, although the dispersion is improved, the reinforcement is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The lime calcined in the lime kiln is digested with hot water at 40°C, the weight ratio of water and lime is 10:1, and then the slurry is sieved and aged for 12 hours. During the aging process, a crystal form control agent is added. The type of control agent is EDTA, and the added amount is 0.4% of the lime solid content. Put the aged lime slurry to 15m 3 The high-speed shearing special carbonization kettle is used for carbonization. The carbonization temperature is controlled at 30°C, the stirring speed is 110r / min, and the carbonized slurry is added with a dispersant. The dispersant is sodium hydrogen phosphate, acrylic acid-2-acrylamide-2 -Methylpropanesulfonic acid copolymer, the addition amount of the two dispersants is 0.2% of the dry basis of calcium carbonate, first add sodium hydrogen phosphate, stir for 5min and then add acrylic acid-2-acrylamide-2-methylpropanesulfonic acid The copolymer was stirred for another 10 minutes and then sieved to the coating kettl...

Embodiment 2

[0026] The lime calcined in the lime kiln is digested with hot water at 50°C. The weight ratio of water and lime is 8:1. After sieving, the slurry is aged for 16 hours. During the aging process, a crystal form control agent is added to control the crystal form. The type of agent is EDTA-Na 2 , the added amount is 0.8% of the lime solid content. Put the aged lime slurry to 15m 3 The high-speed shearing special carbonization kettle is used for carbonization, the carbonization temperature is controlled at 26°C, the stirring speed is 120r / min, and the carbonized slurry is added with a dispersant. The dispersant is potassium hydrogen phosphate, acrylic acid-hydroxypropyl acrylate copolymer , the addition amount of two kinds of dispersants is 0.4% of calcium carbonate dry base respectively, add potassium hydrogen phosphate first, add acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer after stirring for 10min, stir for 15min and pass Sieve, to the coating kettle, the ...

Embodiment 3

[0029] The lime calcined in the lime kiln is digested with hot water at 70°C. The weight ratio of water and lime is 6:1. After sieving, the slurry is aged for 18 hours. During the aging process, a crystal form control agent is added to control the crystal form. The type of agent is soft white sugar, and the added amount is 0.6% of the lime solid content. Put the aged lime slurry to 15m 3 The high-speed shearing special carbonization kettle is used for carbonization. The carbonization temperature is controlled at 24°C and the stirring speed is 130r / min. The carbonized slurry is added with a dispersant. The dispersant is sodium pyrophosphate and maleic acid-acrylic acid copolymer. The addition amount of the two dispersants is 0.6% of the dry basis of calcium carbonate. Add sodium pyrophosphate first, add maleic acid-acrylic acid copolymer after stirring for 10 minutes, and then sieve after stirring for 15 minutes. Celic acid C 22 h 44 o 2 and amino-modified silicone oil, fir...

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Abstract

The invention discloses a preparation method of nano-grade calcium carbonate. The invention belongs to the technical field of compound preparation. The method comprises steps that: S1, lime is digested; S2, a slurry obtained through digestion is sieved, and is then aged; S3, the aged slurry is carbonized; S4, the carbonized slurry is processed through primary cladding; S5, the slurry processed through primary cladding is subject to press-filtrating, drying, crushing, grading, and packaging, such that an intermediate product is obtained; S6, the intermediate product is subject to secondary cladding, such that a nano-grade calcium carbonate finished product is obtained. When the nano-grade calcium carbonate prepared with the method is used in RTV silicon rubber, the nano-grade calcium carbonate has both high dispersity and high reinforcing property.

Description

technical field [0001] The invention relates to the technical field of compound preparation, in particular to a method for preparing nano-calcium carbonate which is specially used for RTV silicone rubber and has high reinforcement and high dispersibility. Background technique [0002] RTV silicone rubber is a kind of room temperature vulcanized rubber. Because of its high temperature resistance, low temperature resistance, moisture resistance, insulation, and aging resistance, it is used in silicone sealants, polysulfides, etc. in the fields of construction, automobiles, electronics, aerospace, and solar energy. Glue, PVC glue and other polymers. However, the mechanical properties of pure RTV silicone rubber are poor. Therefore, it is necessary to add reinforcing fillers to RTV silicone rubber in order to have use value. The usual compensating filler is white carbon black, and calcium carbonate is used as a compatibilizing filler in RTV silicone rubber. With the developmen...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y40/00
Inventor 曾庆铭
Owner 曾庆铭
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