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

AI Technical Summary

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, an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example one

[0023] The lime calcined in the lime kiln is digested with hot water at 40°C, and the weight ratio of water to lime is 10:1. After sieving, the slurry is aged for 12 hours. During the aging process, a crystal form control agent and crystal form are added. The type of control agent is EDTA, and the addition amount is 0.4% of the solid content of lime. 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℃, the stirring speed is 110r / min, and the carbonized slurry is added with a dispersant. The dispersant is sodium hydrogen phosphate and acrylic acid-2-acrylamide-2 -Methylpropanesulfonic acid copolymer, the addition amount of the two dispersants is 0.2% of the calcium carbonate dry basis, first add sodium hydrogen phosphate, stir for 5min, then add acrylic acid-2-acrylamide-2-methylpropanesulfonic acid The copolymer is stirred for another 10 minutes and t...

Example Embodiment

[0025] Example two

[0026] The lime calcined in the lime kiln is digested with hot water at 50°C, and the weight ratio of water to lime is 8:1. Then the slurry is sieved and aged for 16 hours. A crystal form control agent is added during the aging process to control the crystal form. The type of agent is EDTA-Na 2 , The addition amount is 0.8% of the solid content of lime. 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 and the stirring speed is 120r / min. Add dispersant to the carbonized slurry. The dispersant is potassium hydrogen phosphate and acrylic acid-hydroxypropyl acrylate copolymer. , The addition amount of the two dispersants is 0.4% on the dry basis of calcium carbonate, first add potassium hydrogen phosphate, stir for 10 minutes, add acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, and stir for 15 minutes. Sieve, to the coating kettle, t...

Example Embodiment

[0028] Example three

[0029] The lime calcined in the lime kiln is digested with hot water at 70°C, and the weight ratio of water to lime is 6:1. Then the slurry is sieved and aged for 18 hours. A crystal form control agent is added during the aging process to control the crystal form. The type of agent is soft white sugar, and the addition amount is 0.6% of the solid content of lime. 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. Add dispersant to the carbonized slurry. The dispersant is sodium pyrophosphate and maleic acid-acrylic acid copolymer. The addition amount of the two dispersants is 0.6% of the calcium carbonate dry basis. First add sodium pyrophosphate, stir for 10 minutes, then add the maleic acid-acrylic acid copolymer, stir for 15 minutes, then sieving, to the coating kettle, coating agent Ceric acid C 22 H 44 O 2 ...

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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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