Preparation method of special modified calcium hydroxide for coating

A calcium hydroxide, modified technology, applied in chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, coatings, etc., can solve problems that are difficult to meet industrial production, unstable specific surface area, calcium hydroxide Instability and other problems, to achieve the effects of high production efficiency, improved compatibility and adhesion, and good market promotion prospects

Inactive Publication Date: 2021-12-03
NANNING XIAYANG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing production method of calcium hydroxide in my country mainly takes lime as raw material, adds hydrochloric acid to dissolve, and the calcium chloride solution after impurity removal adds alkali precipitation to produce calcium hydroxide, but the calcium hydroxide purity that makes is low, and particle size distribution is not good. Uniformity, low activity, instability, insufficient specific surface area, etc., it is difficult to meet the needs of industrial production
[0003] Calcium hydroxide is an important filler in architectural coatings, but because calcium hydroxide is unstable, easily reacts with carbon dioxide in the air, and has poor compatibility with coatings, it is difficult to achieve uniformity and dispersion during the material preparation process, so that the material Performance drop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method for special modified calcium hydroxide for coatings, comprising the steps of:

[0024] S1: Grind the limestone to a particle size of 4mm, sieve it, and calcinate it at 1000°C for 4 hours, and use water, urea, polyethylene glycol and fatty alcohol polyoxyethylene ether in a mass ratio of 6:0.02:0.015:0.01 to lime Sodium sulfate is digested and aged at a temperature of 90°C to obtain calcium hydroxide emulsion;

[0025] S2: Add an ultrasonic stirrer to the calcium hydroxide emulsion, and then add azidobenzimidazole, cocoyl carboxymethyl sodium imidazoline acetate, and polymethylmethacrylate with a mass ratio of 2:5:7:1. A composite modifier composed of ester-butyl acrylate copolymer and a rare earth coupling agent was ultrasonically dispersed for 40 minutes at a power of 250W, and the amount of the modifier added was 2.5% of the dry weight of calcium hydroxide, which had to be modified. Calcium hydroxide suspension;

[0026] S3: dehydrate the modifi...

Embodiment 2

[0029] A preparation method for special modified calcium hydroxide for coatings, comprising the steps of:

[0030] S1: Grind the limestone to a particle size of 8mm, sieve it, and calcinate it at 1050°C for 3 hours, and use water, urea, polyethylene glycol and fatty alcohol polyoxyethylene ether in a mass ratio of 7:0.015:0.02:0.008 to lime Sodium sulfate is digested and aged at a temperature of 85°C to obtain calcium hydroxide emulsion;

[0031] S2: Add an ultrasonic stirrer to the calcium hydroxide emulsion, and then add azidobenzimidazole, cocoyl carboxymethyl sodium imidazoline acetate, and polymethylmethacrylate with a mass ratio of 2:5:8:3. A composite modifier composed of ester-butyl acrylate copolymer and a rare earth coupling agent was ultrasonically dispersed for 50 minutes at a power of 300W, and the amount of the modifier added was 1.8% of the dry weight of calcium hydroxide, which had to be improved. Calcium hydroxide suspension;

[0032] S3: dehydrate the modif...

Embodiment 3

[0035] A preparation method for special modified calcium hydroxide for coatings, comprising the steps of:

[0036] S1: Grind the limestone to a particle size of 4 mm, sieve, and calcinate at a temperature of 1000 ° C for 4 hours, according to the water, urea, polyethylene glycol and fatty alcohol polyoxyethylene ether with a mass ratio of 6:0.025:0.01:0.012 to lime Sodium sulfate is digested and aged at a temperature of 90°C to obtain calcium hydroxide emulsion;

[0037] S2: Add an ultrasonic stirrer to the calcium hydroxide emulsion, and then add azidobenzimidazole, cocoyl carboxymethyl sodium imidazoline acetate, and polymethylmethacrylate with a mass ratio of 1:4:9:2. A composite modifier composed of ester-butyl acrylate copolymer and a rare earth coupling agent was ultrasonically dispersed for 30 minutes at a power of 350W, and the amount of the modifier added was 2.4% of the dry weight of calcium hydroxide, which had to be improved. Calcium hydroxide suspension;

[0038...

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Abstract

The invention discloses a preparation method of special modified calcium hydroxide for a coating, the preparation method comprises the following steps: crushing limestone, sieving, calcining, adding water, urea, polyethylene glycol and fatty alcohol-polyoxyethylene ether sodium sulfate, carrying out digestion reaction, sieving, removing impurities, and aging to prepare a calcium hydroxide emulsion to be added into an ultrasonic stirrer, then adding a compound modifier composed of azidobenzimidazole, coco-sodium carboxymethyl imidazoline acetate, a polymethyl methacrylate-butyl acrylate copolymer and a rare earth coupling agent, and carrying out ultrasonic dispersion to obtain a modified calcium hydroxide suspension; and dehydrating by a filter press, and drying to obtain the special modified calcium hydroxide for the coating. The calcium hydroxide powder prepared by the method has the advantages of large specific surface area, uniform particle size distribution, good stability, good dispersity, good reinforcing effect and the like, has good compatibility and cohesiveness with the coating, can improve the filling amount of the coating and reduce the cost of the coating, and is simple in process, relatively low in cost and high in production efficiency.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic non-metallic minerals, in particular to a method for preparing modified calcium hydroxide specially used for coatings. Background technique [0002] Calcium hydroxide, also known as slaked lime or slaked lime, is obtained by digesting quicklime with water and is usually a white powdery solid. With the rapid development of industrial modernization and the country's increasing emphasis on environmental protection, calcium hydroxide has been widely used. For example: petrochemical industry, pharmaceutical and food industry plastics, coatings, environmental protection and other fields. The existing production method of calcium hydroxide in my country mainly takes lime as raw material, adds hydrochloric acid to dissolve, and the calcium chloride solution after impurity removal adds alkali precipitation to produce calcium hydroxide, but the calcium hydroxide purity that makes is low, a...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/10C01F11/02C09D7/62
CPCC09C1/02C09C3/043C09C3/08C09C3/10C09C3/006C01F11/02C09D7/62C01P2006/22C01P2006/12
Inventor韦明
OwnerNANNING XIAYANG CHEM TECH CO LTD