A kind of modified calcium sulfate anticorrosion pigment and its preparation method and application

A kind of anti-corrosion pigment, calcium sulfate technology

Active Publication Date: 2017-11-17
HUNAN RUISHI SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, calcium sulfate has a variety of crystal water forms, and different crystal water forms have certain differences in stability in different environments. Therefore, calcium sulfate has poor stability in the entire coating system.

Method used

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  • A kind of modified calcium sulfate anticorrosion pigment and its preparation method and application
  • A kind of modified calcium sulfate anticorrosion pigment and its preparation method and application
  • A kind of modified calcium sulfate anticorrosion pigment and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0054] Phosphogypsum extracted from phosphogypsum has a purity of 95%, a whiteness of 95% ISO, a particle size of 150 μm, and a density of 2.5 g / cm 3 , 50g of calcium sulfate with a refractive index of 1.6, slowly added to the aqueous dispersion containing 2% silane coupling agent KH5501.0g under stirring, and the solid content of the suspension was adjusted to 60%, adjusted with 0.5mol / L HCl solution The pH of the suspension is between 5 and 7, stirred at a speed of 4000r / min for 20 minutes and then transferred to a small ball mill; the grinding medium is ceramic beads with a diameter of 1cm, 2cm, and 3cm at a ratio of 1:1:1. 3:1, adjust the voltage of the ball mill to 150V, and grind the mixture for 180 minutes; transfer the ground suspension and ceramic beads to a blast drying oven for drying at 105°C for 5 hours; finally put the dried mixture into the ball mill again Grind into powder. The whiteness of the powder is 95% ISO.

Embodiment 2

[0056] The purity extracted from desulfurized gypsum is 99%, the whiteness is 95% ISO, the particle size is 200μm, and the density is 2.6g / cm 3 , 50g of calcium sulfate with a refractive index of 1.7 was slowly added under stirring to the aqueous dispersion containing 1% silane coupling agent KH5700.5g and 2% titanate coupling agent 1020.5g, and the solid content of the suspension was adjusted to 65%, use 0.5mol / L HCl solution to adjust the pH of the suspension between 5 and 7, stir at a speed of 3000r / min for 15min and then transfer to a ball mill; the grinding medium is 1:1:1 and the diameter is 1cm , 2cm, 3cm ceramic beads, the ratio of ball to material is 5:1, the voltage of the ball mill is adjusted to 200V, and the mixture is ground for 150min; the suspension and ceramic beads after grinding are transferred to a blast drying oven for drying, and dried at 105°C for 4 hours ; Finally, put the dried mixture into the ball mill again and grind it into powder. Whiteness is 95...

Embodiment 3

[0058] The purity extracted from desulfurized gypsum is 99%, the whiteness is 96% ISO, the particle size is 200μm, and the density is 2.6g / cm 3 , 50g of calcium sulfate with a refractive index of 1.7, slowly added to the water dispersion containing 2% silane coupling agent DL6021.5g under stirring, adjusted the solid content of the suspension to 50%, adjusted with 0.5mol / L HCl solution The pH of the suspension is between 5 and 7, stirred at a speed of 4000r / min for 20 minutes and then transferred to a ball mill; the grinding medium is ceramic beads with a diameter of 1cm, 2cm, and 3cm at a ratio of 1:1:1, and the ball-to-material ratio is 3 : 1. Adjust the voltage of the ball mill to 150V, and grind the mixture for 180 minutes; transfer the ground suspension and ceramic beads to a blast drying oven for drying at 105°C for 6 hours; finally put the dried mixture into the ball mill again Grind into powder. The whiteness of the powder is 96% ISO.

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Abstract

The invention discloses a modified calcium sulfate anticorrosion pigment and its preparation method and application. Calcium sulfate extracted from industrial by-product gypsum is made into a suspension with a certain solid content, and at the same time, a modifier is added according to a certain mass percentage, and then Put it into a ball mill to mix and grind evenly. Dry the ground mixture at 80-150° C. for 3-6 hours, and then grind it into powder for pulverization after cooling. It is preferable to add aminosilane-modified fumed silica during the pulverization process. The calcium sulfate anticorrosion pigment of the present invention can effectively solve the pressure brought by the industrial by-product gypsum to the environment, and can be used in combination with other anticorrosion pigments to enhance the covering power, abrasion resistance and corrosion resistance of the coating film, and the pigment in the resin The dispersibility is good, the production process is simple, the production cost is low, and good social and economic benefits can be brought.

Description

technical field [0001] The invention relates to a modified calcium sulfate anticorrosion pigment, a preparation method and application thereof. technical background [0002] According to statistics, in 2013, my country's phosphogypsum emissions were about 70 million tons, and desulfurization gypsum emissions were about 67 million tons. The emissions of other titanium gypsum, citrate gypsum, and fluorogypsum were also quite large. Such a large amount of industrial by-product gypsum has caused huge environmental and economic pressures on various production enterprises. [0003] In recent years, calcium sulfate extracted from desulfurization gypsum, phosphogypsum and other industrial by-product gypsum waste slag or metal smelting waste slag is a new type of inorganic material, which has many excellent properties such as high temperature resistance, acid and alkali corrosion resistance, low wear, and stable size. Physical and chemical properties, but due to the limitations of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/06C09C3/12C09D5/08
Inventor 覃盛涛孙丽红曹静刘翠侯玲红徐典洋
Owner HUNAN RUISHI SCI & TECH DEV
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