Preparation method of high temperature resistance ultrafine active calcium carbonate

A technology of activated calcium carbonate and ultra-fine calcium carbonate, which is applied in the direction of climate sustainability, sustainable manufacturing/processing, dyeing polymer organic compound treatment, etc., and can solve problems such as high surface energy, small particle size, and yellowing

Active Publication Date: 2019-06-28
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the small particle size and high surface energy of ultra-fine calcium carbonate, it is easy to agglomerate, the surface is hydrophilic and oleophobic, and the surface properties are very different from the organic polymer matrix, resulting in great defects in the structure of the composite material. The gap between the matrix and the filler Adhesion is a key factor that determines the final properties of the material, especially the mechanical properties. Therefore, the surface of calcium carbonate needs to be modified. The commonly used calcium carbonate surfactant is the use of fatty acids, including stearic acid, coconut oil, and oleic acid. etc.

Method used

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  • Preparation method of high temperature resistance ultrafine active calcium carbonate
  • Preparation method of high temperature resistance ultrafine active calcium carbonate
  • Preparation method of high temperature resistance ultrafine active calcium carbonate

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Embodiment 1

[0030] A preparation method of high temperature resistant ultrafine activated calcium carbonate, comprising the following steps:

[0031] S1. Preparation of ultrafine calcium carbonate slurry: using a carbonization method to obtain cooked nanometer calcium carbonate slurry as ultrafine calcium carbonate slurry;

[0032] S2. Put the ultrafine calcium carbonate slurry prepared in S1 in a sealed container, add 0.5-5% acrylic acid, and age for 24 hours at a temperature of 120° C. to obtain an aged slurry;

[0033] The amount of dispersant is calculated based on the mass of calcium carbonate on a dry basis;

[0034] S3. Add a surface treatment agent to the aged slurry prepared in S2, use a microwave with a power of 100W to carry out an auxiliary catalytic reaction, the temperature is 80°C, and the stirring and activation treatment time is 0.5h. After the surface treatment is completed, the slurry is dehydrated by pressure filtration , dried and pulverized to obtain the product;

...

Embodiment 2

[0038] A preparation method of high temperature resistant ultrafine activated calcium carbonate, comprising the following steps:

[0039] S1. Preparation of ultrafine calcium carbonate slurry: using carbonization method to obtain light calcium carbonate cooked slurry as ultrafine calcium carbonate slurry;

[0040] S2. Put the ultrafine calcium carbonate slurry prepared in S1 in a sealed container, add 1% sodium hexametaphosphate, 1% citric acid, 1% silane coupling agent, and 2% sodium lauryl sulfate. , aged for 144h, and the aging temperature was 120° C. to obtain aged pulp; the amount of the dispersant was calculated based on the mass of calcium carbonate on a dry basis;

[0041] S3. Add a surface treatment agent to the aged slurry prepared in S2, and use a high pressure of 0.1 to 0.5 MPa to carry out an auxiliary catalytic reaction. The temperature of the reaction treatment is 130°C, and the stirring and activation treatment time is 2h. After the surface treatment is complet...

Embodiment 3

[0045] A preparation method of high temperature resistant ultrafine activated calcium carbonate, comprising the following steps:

[0046] S1. Preparation of ultrafine calcium carbonate slurry: using a carbonization method to obtain cooked nanometer calcium carbonate slurry as ultrafine calcium carbonate slurry;

[0047] S2. Place the superfine calcium carbonate slurry prepared in S1 in a sealed container, add 0.5% sodium lauryl sulfate, 0.8% ethylenediaminetetraacetic acid, 0.4% cetyltrimethylammonium bromide, 0.2 A dispersant composed of % polyvinylpyrrolidone was aged for 45h, and the aging temperature was 100°C to obtain aged pulp; the amount of the dispersant was calculated as the mass of calcium carbonate on a dry basis;

[0048] S3. Add a surface treatment agent to the aged slurry prepared in S2, use a microwave with a power of 300W and a high pressure with a pressure of 0.7-0.9MPa to carry out an auxiliary catalytic reaction, the temperature of the reaction treatment is...

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Abstract

The invention provides a preparation method of high temperature resistance ultrafine active calcium carbonate, and relates to the technical field of preparation and processing of calcium carbonate powder. The preparation method comprises the following steps of S1, preparing an ultrafine calcium carbonate slurry; S2, adding a dispersing agent into the ultrafine calcium carbonate slurry prepared byS1, and aging for 24-144 hours to obtain an aged slurry; S3, adding a surface treatment agent to the aged slurry prepared by S2, carrying out an auxiliary catalytic reaction by microwave or/and high pressure, after the surface treatment is finished, dehydrating the slurry by pressure filtration, drying, and pulverizing to obtain the calcium carbonate. The surface treatment agent is surface-hydrophilically-treated fatty acid, and the surface treatment agent accounts for 3-5% the mass of the dry basis of the calcium carbonate. The ultrafine active calcium carbonate can maintain the activation degree at 350 DEG C, and do not volatilize and turn yellow. The ultrafine active calcium carbonate can be widely applied to products having a processing temperature of 270 DEG C or higher such as BOPP and the like.

Description

technical field [0001] The invention relates to the technical field of preparation and processing of ultrafine active calcium carbonate powder, in particular to a preparation method of high temperature resistant ultrafine active calcium carbonate. Background technique [0002] Ultrafine calcium carbonate is the most widely used chemical product at present. As a new type of functional filler with excellent performance, it is widely used as an additive and a reinforcing agent. It can not only increase capacity, reduce costs, save masterbatch, but also Improve the surface color of the product and improve the comprehensive mechanical properties of the product. [0003] Due to the small particle size and high surface energy of ultra-fine calcium carbonate, it is easy to agglomerate, the surface is hydrophilic and oleophobic, and the surface properties are very different from the organic polymer matrix, resulting in great defects in the structure of the composite material. The gap...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/08C09C3/10C09C3/12
CPCY02P20/10
Inventor 何丽秋莫淑一龙飞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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