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A kind of preparation method of core-shell structure high white precipitated calcium carbonate

A technology of precipitated calcium carbonate and core-shell structure, applied in the direction of calcium carbonate/strontium/barium, etc., can solve problems such as failure to achieve ideal application effects, polluted products, whiteness failure, etc., achieve enhanced coating effect, low cost, The effect of permanent whiteness maintenance

Active Publication Date: 2020-11-17
卢氏国嵩莱纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These chemical whitening technologies can all achieve the effect, but either introduce toxic substances, or pollute the product, or the cost is high, and the additives added will gradually become invalid, the product will return to yellow, and the whiteness will decrease over time. Will "whiteness failure", can not achieve the ideal application effect

Method used

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  • A kind of preparation method of core-shell structure high white precipitated calcium carbonate
  • A kind of preparation method of core-shell structure high white precipitated calcium carbonate

Examples

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Effect test

Embodiment 1

[0031] A preparation method of high-white precipitated calcium carbonate with core-shell structure, comprising the following steps,

[0032] Step 1. Digest the quicklime with a whiteness of 90 and digested water at 50°C in a ratio of 1:9 by mass, and carry out the digestion reaction. After the reaction is completed, sieve it through a 320-mesh vibrating sieve. After sieving, use a three-stage The suspension separator removes impurities to obtain low-whiteness calcium hydroxide seminal pulp, and ages the seminal pulp for 40 hours;

[0033] Step 2: Mix quicklime with a whiteness of 96 and digested water at 50°C in a ratio of 1:9 by mass, then carry out the digestion reaction. After the reaction is completed, sieve through a 320-mesh vibrating sieve, and use a third-stage The suspension separator removes impurities to obtain high-whiteness calcium hydroxide seminal pulp, and ages the seminal pulp for 40 hours;

[0034] Step 3: Add an appropriate amount of water to the aged low-w...

Embodiment 2

[0040] A preparation method of high-white precipitated calcium carbonate with core-shell structure, comprising the following steps,

[0041] Step 1. Digest the quicklime with a whiteness of 86 and digested water at 45°C in a mass ratio of 1:8, and carry out the digestion reaction. After the reaction is completed, sieve through a 250-mesh vibrating sieve. After sieving, use a three-stage The suspension separator removes impurities to obtain low-whiteness calcium hydroxide seminal pulp, and ages the seminal pulp for 36 hours;

[0042] Step 2: Mix quicklime with a whiteness of 95 and digested water at 45°C in a ratio of 1:8 by mass, and carry out digestion reaction. After the reaction is completed, sieve through a 250-mesh vibrating sieve, and use a third-stage The suspension separator removes impurities to obtain high-whiteness calcium hydroxide seminal pulp, and ages the seminal pulp for 36 hours;

[0043] Step 3, adding an appropriate amount of water to the aged low-whiteness...

Embodiment 3

[0049] A preparation method of high-white precipitated calcium carbonate with core-shell structure, comprising the following steps,

[0050] Step 1. Digest the quicklime with a whiteness of 88 and digested water at 40°C in a mass ratio of 1:10, and carry out the digestion reaction. After the reaction is completed, sieve through a 200-mesh vibrating sieve. After sieving, use a three-stage The suspension separator removes impurities to obtain low-whiteness calcium hydroxide seminal pulp, and ages the seminal pulp for 38 hours;

[0051] Step 2: Digest the quicklime with a whiteness of 97 and digested water at 40°C in a ratio of 1:10 by mass, and carry out the digestion reaction. After the reaction is completed, sieve through a 200-mesh vibrating sieve. After sieving, use a three-stage The suspension separator removes impurities to obtain high-whiteness calcium hydroxide seminal pulp, and ages the seminal pulp for 38 hours;

[0052] Step 3, adding an appropriate amount of water t...

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Abstract

The invention discloses a preparation method of core-shell structure high-white precipitated calcium carbonate. The method comprises the steps that digesting, screening, impurity removing and aging are conducted on low-quality-level and low-white quick lime, a crystalline form controlling agent is added to conduct carbonation reaction, and a formed low-white calcium carbonate particle is taken asa core; digesting, screening, impurity removing and ageing are conducted on high-white quick lime, the high-white quick lime is grafted to a core surface after carbonation reaction to be taken as a housing, filter pressing dehydrating, drying, pulverizing and grading are conducted after the reaction is completed, and the core-shell structure high-white precipitated calcium carbonate is obtained. According to the method, the white level of a calcium carbonate product with the white level of below 90 degrees can be improved to 90 degrees or above by the calcium carbonate prepared by the method,particular diameter distribution of the product is concentrated, the dispersing performance is good, the calcium carbonate is applied to PVC panels and tubular materials, and processing performance, whitening and toughening are achieved. The product technology is simple and implementable, the cost is low, the price is cheap, and the economic benefits are better.

Description

technical field [0001] The invention relates to the technical field of preparation of precipitated calcium carbonate, in particular to a preparation method of high-white precipitated calcium carbonate with a core-shell structure. Background technique [0002] Precipitated calcium carbonate (PCC) can be divided into PCC for rubber, PCC for plastics, PCC for papermaking, PCC for toothpaste, PCC for medicine and so on according to its use. PCC series products are widely used in industries such as rubber, plastic, papermaking, paint, wire, cable, ink, sealant, medicine, food, etc. Especially in recent years, with the progress of domestic miniaturization and surface treatment technology, PCC products have become The development of specialization, refinement, and functionalization has expanded the application field, and the amount of PCC is increasing. According to the statistics of the Calcium and Magnesium Association, the amount of PCC in 2013 has exceeded 10 million tons, and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K9/04C08K3/26C08K9/10C08L27/06C01F11/18
Inventor 杜年军孙勇峰
Owner 卢氏国嵩莱纳米科技有限公司
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