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Preparation method of ultrafine coating light calcium carbonate

A light calcium carbonate, coating technology, applied in the direction of calcium carbonate/strontium/barium, pigment-containing coatings, etc., can solve the problems to be further improved, and achieve the effects of fine particle size, avoidance of flocculation, and low viscosity

Inactive Publication Date: 2013-04-03
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technology disclosed in this patent is applied in the high-speed coating process, and its contribution to indicators such as paper strength and gloss still needs to be further improved

Method used

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  • Preparation method of ultrafine coating light calcium carbonate
  • Preparation method of ultrafine coating light calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the water slurry of calcium hydroxide (average particle size is 5 μm) with a weight concentration of 5%, add 0.08% of the dry weight of calcium hydroxide as a composite dispersant, the composite dispersant consists of 40% of 18 carbon Atomic mixed phosphate sodium salt, 40% sodium polyacrylate and 20% acetyl triethyl citrate. Mixed phosphate sodium salt is a mixture of dodecyl phosphate monoester sodium salt and heptadecanyl diester sodium salt, and the molar ratio of monoester to diester is 1:1.

[0020] The calcium hydroxide slurry was fed into two 300-liter vertical sand mills connected in series with a pneumatic diaphragm pump, and the feed flow rate was 15 liters / minute. At the same time, pass pure carbon dioxide gas from the bottom of each sand mill, the flow rate of carbon dioxide is 90 liters per minute, and turn on the sand mill to make grinding and carbonization proceed simultaneously. The slurry discharged from the second sand mill is completely carbonize...

Embodiment 2

[0022] In the calcium hydroxide (average particle size: 10 μm) water slurry with a weight concentration of 20%, add 2% of the dry weight of calcium hydroxide as a composite dispersant, the composite dispersant consists of 55% of 12 carbon Atomic mixed phosphate ammonium salt, 30% sodium polyacrylate and 15% acetyl triethyl citrate. The mixed phosphate ammonium salt is a mixture of lauryl phosphate monoester ammonium salt and heptadecyl diester ammonium salt, and the molar ratio of monoester to diester in the mixed phosphate ammonium salt is 1:1.5.

[0023] The calcium hydroxide slurry is sent into five 80-liter vertical sand mills in series with a pneumatic diaphragm pump, and the feed flow rate is 8 liters / minute. At the same time, pass pure carbon dioxide gas from the bottom of each sand mill, the flow rate of carbon dioxide is 50 liters per minute, and turn on the sand mill to make grinding and carbonization proceed simultaneously. The slurry discharged from the fifth sand...

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Abstract

The invention provides a preparation method of ultrafine coating light calcium carbonate. The preparation method comprises the following steps of: adding a compound dispersant to calcium hydroxide water slurry, then sending the slurry to grinding equipment to be ground and simultaneously filling carbon dioxide gas to carry out carbonization, and carbonizing the slurry until the pH value of the calcium hydroxide slurry is 6.5-7.5, thus obtaining the slurry containing ultrafine light calcium carbonate, wherein the compound dispersant comprises mixed phosphate salt, sodium polyacrylate and citrate; and the mixed phosphate salt is a mixture of dodecanol phosphomonoester and heptadecanol phosphodiester. The preparation method has the advantages that the prepared ultrafine light calcium carbonate slurry is directly used for coating without drying, thus not only saving the cost but also avoiding the problem of flocculation of ultrafine grains in the drying process; the ultrafine light calcium carbonate produced by the method has a small grain size; the slurry prepared from the ultrafine light calcium carbonate has low viscosity; and used for coating paper, the ultrafine light calcium carbonate can improve the quality of paper and reduce the production cost.

Description

technical field [0001] The invention relates to a preparation method of superfine coated light calcium. Background technique [0002] In recent years, the speed of paper coating has made amazing progress, especially the coating outside the machine, whose operation has reached 1700m / min, even more than 2000m / min. Under such high speed coating conditions, many coating quality and running problems can arise. In particular, the requirements for the strength and gloss of coated paper are high. [0003] Light calcium carbonate is an important inorganic chemical raw material. The fineness of light calcium carbonate powder produced by ordinary carbonization method is generally about 400 mesh, the particle size is large, and the aggregation phenomenon between particles is serious, which affects the light calcium carbonate powder. Calcium application. [0004] CN1884085A discloses a preparation method of ultrafine light calcium carbonate, which uses one or more of phosphate salt, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18D21H19/38
Inventor 施晓旦施依莎田雨
Owner SHANGHAI DONGSHENG NEW MATERIALS
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