Aqueous slurry of nanoscale calcium carbonate and its preparation method and application

A nano-scale calcium carbonate and nano-calcium carbonate technology, applied in the field of materials, can solve the problems of limited transparent wood paint, instability, limited application, etc., and achieve the effects of good stability, uniform dispersion and convenient use.

Active Publication Date: 2019-02-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, in the existing patents, the calcium carbonate particles obtained by grinding are all micron-sized and cannot be stabilized in most slurries, resulting in limited applications, especially limited to transparent wood lacquers

Method used

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  • Aqueous slurry of nanoscale calcium carbonate and its preparation method and application
  • Aqueous slurry of nanoscale calcium carbonate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 27.97g of quicklime into 280g of water at 80°C, and digest it at 1000rpm with a dispersing disc for 2h. Pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, add water to prepare a 12wt% calcium hydroxide suspension, age for 24 hours, and set aside.

[0032] Calcium hydroxide suspension is dispersed with dispersing disc 1000rpm line cutting, adds 0.6wt% dilute sulfuric acid solution and 2wt% polyethylene glycol 400 (mass percentage of calcium carbonate theoretical yield), controls carbonization temperature and is less than 15 ℃, from the bottom into CO 2 / N 2 Mixed gas (60 / 120m 3 h -1 m -3 Suspension liquid), carbonized, carbonized to pH = 7, and then the reaction solution was filtered and washed.

[0033] The above-mentioned calcium carbonate and water are mixed into a 40wt% slurry, sanded in a circulating sand mill, and 3.4wt% sodium polyacrylate is added before the sanding, and sanded for 10 minutes to obtain a nano-calcium carbon...

Embodiment 2

[0035] Put 27.97g of quicklime into 280g of water at 80°C and digest it for 4h with a dispersing disc at 1000rpm. Pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, add water to prepare a 12wt% calcium hydroxide suspension, age for 24 hours, and set aside.

[0036] Calcium hydroxide suspension is dispersed with dispersing disk 1000rpm line cutting, adds 1.5wt% sodium silicate solution and 3wt% polyethylene glycol 600 (mass percentage of calcium carbonate theoretical yield), controls carbonization temperature less than 15 ℃, from Bottom into CO 2 / N 2 Mixed gas (40 / 120m 3 h -1 m -3 Suspension liquid), carbonized, carbonized to pH = 7, and then the reaction solution was filtered and washed.

[0037] Mix the above-mentioned calcium carbonate with water to form a 20wt% slurry, sand it in a circulating sand mill, add 2.2wt% sodium hexametaphosphate before sanding, and sand it for 15 minutes to obtain a nano-calcium carbonate slurry with an averag...

Embodiment 3

[0039] Put 22.95g of quicklime into 280g of water at 80°C, and digest it at 1000rpm with a dispersion plate for 3h. Pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, add water to prepare a 10 wt% calcium hydroxide suspension, age for 24 hours, and set aside.

[0040] Calcium hydroxide suspension is dispersed with dispersing disc 1000rpm line cutting, adds 1.0wt% dilute sulfuric acid solution and 4wt% polyethylene glycol 600 (mass percentage of calcium carbonate theoretical yield), controls carbonization temperature to be less than 15 ℃, from the bottom into CO 2 / N 2 Mixed gas (60 / 120m 3 h -1 m -3 Suspension liquid), carbonized, carbonized to pH = 7, and then the reaction solution was filtered and washed.

[0041] The above-mentioned calcium carbonate is mixed with water to form a 10wt% slurry, sanded in a circulating sand mill, and 3.0wt% sodium polyacrylate is added before sanding, and sanded for 20 minutes to obtain a nano-calcium carbon...

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Abstract

The invention provides aqueous slurry of nano calcium carbonate as well as a preparation method and an application thereof. The method comprises steps as follows: Step 1, quick lime is placed into water at 80 DEG C and digested by a dispersion disk at the revolving speed being 1,000 rpm for 2-4 h, an obtained calcium hydroxide turbid liquid passes through a standard sieve of 200 meshes, a certain amount of water is added, and then a turbid liquid with a certain mass fraction is prepared and aged for 24 h; Step 2, the calcium hydroxide turbid liquid is dispersed in a wire cutting manner, a crystal form agent and a dispersing agent A are added, the carbonization temperature is controlled to be lower than 15 DEG C, CO2 / N2 mixed gas is introduced from the bottom to carbonize the turbid liquid, the turbid liquid is carbonized until the pH is equal to 7, and then a reaction liquid is filtered and washed; Step 3, slurry with certain concentration is prepared from calcium carbonate and water and sanded, a dispersing agent B is added before sanding or in the sanding process, and then the stable nano calcium carbonate slurry is obtained. The slurry is uniformly dispersed and is good in stability, capable of being stored for a long time without coagulation and convenient to use.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to an aqueous slurry of nano-scale calcium carbonate and a preparation method and application thereof. Background technique [0002] Wood has natural beauty such as special texture, appearance and color, and it is still the main raw material for furniture and home decoration so far. Wood varnish has perfect decoration and long-lasting protection, so it is widely used in wood coating and protection. Traditional wood lacquers are mainly oil-based solvent lacquers, which contain a large amount of volatile organic compounds (VOC), and have serious pollution and toxicity problems. With the improvement of people's awareness of environmental protection and health, wood products with low VOC and zero VOC emissions are considered the first choice, and environmentally friendly water-based wood paints have emerged as the times require, and soon occupied a certain market share, even as early...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y40/00C09D7/62
CPCC01F11/181C01F11/183C01F11/185C01P2004/04C01P2004/52C01P2004/62C08K3/26C08K2003/265C08K2201/011C09D7/62
Inventor 庞起刘旭韩行健杨昊郭豪
Owner GUANGXI UNIV
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