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Preparation method of modified calcium carbonate

A calcium carbonate and modification technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve problems such as production line shutdown, loss of use effect, silver streaks, etc., and achieve good printing performance and strong combination , smooth surface effect

Active Publication Date: 2017-01-11
JIANGXI GUANGYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although precipitated nano-calcium can solve the problems of reducing costs and improving some mechanical properties, it has the following defects: 1) In the production process of precipitated nano-calcium, in order to ensure its fine particle size and large specific surface area, it must be processed during the production process. Add 2.1-2.8% stearic acid; however, adding more than 1% stearic acid will seriously affect the printing performance of the car body film, for the car body film, it will lose its good printing performance and ink absorption Use effect; 2) In the process of chemical reaction of precipitated nano-calcium, the particles reach the nanometer level, and in the subsequent dehydration and drying process, basically adopt filter press dehydration and chain oven drying, which results in the generation of nano-calcium particles There is a huge agglomeration phenomenon, and there are particles of different sizes in the product after drying, which will seriously affect its blanking during the automatic batching process of the production of car body film, resulting in poor processing fluidity ;Excellent processing fluidity is crucial to the production of body stickers by PVC calendering method. Due to a little uneven processing fluidity, a piece of PVC calendered body stickers with a length of hundreds of meters may be scrapped or even cause the entire production line to stop production; At the same time, the poor dispersion of precipitated nano-calcium fillers will also cause defects such as "fish eyes" and "silver streaks" on the surface of the car body film; The direction of high brightness is developing, and the addition of calcium carbonate will affect the surface brightness of the car body film, making it difficult to meet the functional requirements

Method used

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Examples

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Effect test

Embodiment 1

[0034] A preparation method of modified calcium carbonate, comprising the following steps:

[0035](1) Large calcite ore and talc are crushed at a mass ratio of 100:3, ground into 400 mesh dry powder, configured into a raw slurry with a solid content of 72%, and pumped into a 3600L vertical wet grinder for wet grinding. Grinding by the method, grinding into a cooked slurry with an average particle size of 1 μm;

[0036] (2) Naphthalene sulfonate anti-precipitation agent KM-S and 80°C warm water are prepared into an aqueous solution with a mass fraction of 3-5%;

[0037] (3) The cooked slurry is pumped into the stirring tank for liquid phase dispersion, and the anti-sedimentation agent KM-S aqueous solution of the cooked slurry volume ratio of 1.2%, sodium dodecylbenzenesulfonate and the cooked slurry volume ratio of 0.5% are added simultaneously. An aqueous solution of sodium N-lauroyl glutamate; the conditions for controlling the dispersion of the liquid phase are that the s...

Embodiment 2

[0041] A preparation method of modified calcium carbonate, comprising the following steps:

[0042] (1) Large calcite ore and talc are crushed at a mass ratio of 100:4, ground into 400-mesh dry powder, configured into a raw slurry with a solid content of 75%, and pumped into a 3600L vertical wet grinder for wet grinding. Grinding method, grinding into a cooked slurry with an average particle size of 0.9 μm;

[0043] (2) KM-S and 80°C warm water are prepared into an aqueous solution with a mass fraction of 3-5%;

[0044] (3) Pump the cooked slurry into the stirred tank for liquid phase dispersion, and add the anti-precipitation agent KM-S aqueous solution with a volume ratio of 0.7% of the cooked slurry, sodium dodecylbenzenesulfonate with a volume ratio of 0.7% of the cooked slurry, An aqueous solution of sodium N-lauroyl glutamate and sodium dodecyl phosphate; the conditions for controlling the dispersion of the liquid phase are that the stirring temperature is 80°C, the sti...

Embodiment 3

[0048] A preparation method of modified calcium carbonate, comprising the following steps:

[0049] (1) Large calcite ore and talc are crushed at a mass ratio of 100:5, ground into a 400-mesh dry powder, configured into a raw slurry with a solid content of 70%, and pumped into a 3600L vertical wet grinder for wet grinding. Grinding by the method, grinding into a cooked slurry with an average particle size of 1.1 μm;

[0050] (2) KM-S and 80°C warm water are prepared into an aqueous solution with a mass fraction of 3-5%;

[0051] (3) Pump the cooked slurry into the stirring tank for liquid phase dispersion, and add the anti-sedimentation agent KM-S aqueous solution with a volume ratio of 1.5% of the cooked slurry, sodium dodecylbenzenesulfonate with a volume ratio of 0.9% of the cooked slurry, An aqueous solution of ammonium lauryl sulfate and sodium N-lauroyl acyl glutamate; the conditions for controlling the dispersion of the liquid phase are that the stirring temperature is...

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Abstract

The invention provides a preparation method modified calcium carbonate. The preparation method includes: mixing and crushing calcite and talcum, performing dry grinding to obtain raw slurry with solid content being 70-75%, performing constant-temperature stirring and grinding to obtain processed slurry with average particle size being 0.9-1.1 micrometers, adding naphthalene sulfonate type anti-precipitation agent and anionic surfactant into the processed slurry to perform liquid-phase dispersing, drying, collecting, depolymerizing and dispersing, adding brightener and liquid surface modifier to perform wrapping treatment, and stirring to obtain the modified calcium carbonate. By the preparation method, the modified calcium carbonate which is good in printing performance, good in dispersity, good in surface brightness and applicable to films adhered to car bodies can be prepared.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of calcium carbonate fillers, in particular to a preparation method for modified calcium carbonate fillers used in car body film. [0003] 【Background technique】 [0004] Calcium Carbonate (Calcium Carbonate) is an important and widely used inorganic salt, widely used in papermaking, plastics, chemical fiber, rubber, adhesives, sealants, cosmetics, building materials, coatings, medicine, food and feed, etc. To increase product volume, reduce production costs, improve processing performance, improve dimensional stability and improve physical properties. [0005] The filler used in the traditional polyvinyl chloride (PolyVinyl Chloride, PVC) calendering method to produce body film is precipitated nano-calcium (ie, nano-scale calcium carbonate prepared by precipitation method). Although precipitated nano-calcium can solve the problems of reducing costs and improving some mechanical properties, it has the followi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/12
CPCC09C1/021C09C3/006C09C3/041C09C3/08C09C3/12
Inventor 彭鹤松邹检生曾伟冯才敏袁斌
Owner JIANGXI GUANGYUAN CHEM
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