Preparation method of monodispersed nano-calcium carbonate with low surface energy

A technology of nano-calcium carbonate and low surface energy, which is applied in nanotechnology, calcium carbonate/strontium/barium, nanotechnology, etc. for materials and surface science, and can solve the problems of increasing costs, affecting the performance of nano-calcium carbonate, and high surface energy. problems, achieve the effects of reducing specific surface energy, inhibiting re-aggregation, and inhibiting crystal growth

Active Publication Date: 2019-06-07
GUILIN UNIVERSITY OF TECHNOLOGY +1
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the small particle size and high surface energy of nano-calcium carbonate, the primary grains formed during carbonization are easy to agglomerate to form secondary agglomerates, which cannot be effectively dispersed even through subsequent surface modification and high shear force.
When the nano-calcium carbonate in the agglomerated state is used as a filler, due to poor dispersion, the performance of the product is not greatly improved compared with that of micron-sized calcium carbonate, or even worse, and the advantages of nano-materials cannot be effectively exerted
[0004] Chinese patent CN100341786C discloses a kind of monodisperse cubic light calcium carbonate and its preparation method and application, the block copolymer aqueous solution of acrylic acid and polyethylene glycol acrylate is added to Ca(OH) 2 carbonization in the aqueous slurry to obtain a slurry containing monodisperse cubic light calcium carbonate particles, the prepared calcium carbonate has good dispersibility, but the surface energy is still high, and the performance still cannot meet the production requirements
Chinese patent 106542557B discloses a preparation process of nano-calcium carbonate, using high-activity quicklime and high-purity carbon dioxide as raw materials, and using a three-stage carbonization tower as a reaction device for reaction preparation; the nano-calcium carbonate prepared by this method has particle size dispersion Good properties, uniform size, distribution between 20-30nm, and regular shape, etc., but high-purity carbon dioxide is used in the entire carbonization reaction process, which increases the cost of the product, and the three-stage carbonization tower causes waste of space
In summary, the existing preparation methods are all processed in the process of carbonization or carbonization to improve the dispersion, but do not pay attention to the secondary agglomeration, thus affecting the performance of nano-calcium carbonate

Method used

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  • Preparation method of monodispersed nano-calcium carbonate with low surface energy
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  • Preparation method of monodispersed nano-calcium carbonate with low surface energy

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Embodiment 1

[0031] A preparation method of low surface energy monodisperse nano-calcium carbonate, comprising the following steps:

[0032] S1. Prepare nano-calcium carbonate cooked pulp. Nano-calcium carbonate cooked pulp was prepared by intermittent bubbling carbonization method, the solid content of the raw pulp was 9%, the carbonization starting temperature was 20°C, and CO 2 The content is 35%; the carbonization is completed until the slurry pH=7.0. After carbonization, the product obtained is in the form of a chain aggregate or a nearly spherical granular aggregate, the primary grain diameter is 50-100nm, and the aggregate is 3-5μm.

[0033] S2. Adding an aging agent to the cooked nano-calcium carbonate slurry prepared in S1, the aging temperature is 80° C., and the aging time is 24 hours to obtain an aged suspension of nano-calcium carbonate.

[0034] The aging agent is 1% ammonia water, 0.5% urea and 0.5% citric acid, and the amount of aging agent is calculated according to the ...

Embodiment 2

[0038] A preparation method of low surface energy monodisperse nano-calcium carbonate, comprising the following steps:

[0039] S1. Prepare nano-calcium carbonate cooked pulp. Adopt Venturi carbonization method to prepare nano-calcium carbonate cooked pulp, under room temperature, add the calcium hydroxide suspension that concentration is 8% in the carbonization tower, pass into carbon dioxide gas (CO 2 content 30%) to the pH of the reaction slurry=6.5 to obtain the cooked slurry of nano-calcium carbonate.

[0040] S2. Adding an aging agent to the cooked nano-calcium carbonate slurry prepared in S1, the aging temperature is 100° C., and the aging time is 12 hours to obtain an aged suspension of nano-calcium carbonate.

[0041] The seasoning agent is hydrochloric acid. The dosage of the aging agent is 0.5% of the mass of calcium carbonate on a dry basis.

[0042] S3. Adding a surface treatment agent to the aged suspension of nano-calcium carbonate prepared in S2 for surface ...

Embodiment 3

[0045] A preparation method of low surface energy monodisperse nano-calcium carbonate, comprising the following steps:

[0046] S1. Prepare nano-calcium carbonate cooked pulp. Nano-calcium carbonate cooked pulp was prepared by high-gravity carbonization method, the solid content of the raw pulp was 12%, and the carbonization starting temperature was room temperature, CO 2 Content 29%. When the reaction slurry reaches a pH of 6.0, the carbonization is stopped to obtain a cooked slurry of nano-calcium carbonate.

[0047] S2. Adding an aging agent to the cooked nano-calcium carbonate slurry prepared in S1, the aging temperature is 80° C., and the aging time is 48 hours to obtain an aged suspension of nano-calcium carbonate.

[0048] Described aging agent is acetic acid, and the consumption of aging agent is 3% of calcium carbonate dry weight.

[0049] S3. Adding a surface treatment agent to the aged suspension of nano-calcium carbonate prepared in S2 for surface treatment, the t...

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Abstract

The invention provides a preparation method of monodispersed nano-calcium carbonate with low surface energy and relates to the technical fields of preparation and processing of nano-calcium carbonatepowder. The preparation method comprises the following steps: S1, preparing boiled nano-calcium carbonate pulp; S2, adding an aging agent into the boiled nano-calcium carbonate pulp prepared in S1, and carrying out aging treatment to obtain a nano-calcium carbonate aging suspension; and S3, adding a surface treating agent into the nano-calcium carbonate aging suspension prepared in S2 to carry outsurface treatment, and then, carrying out filtration pressing dehydrating, drying and smashing to obtain the monodispersed nano-calcium carbonate with low surface energy. According to the preparationmethod, due to the addition of the aging agent, secondary aggregate depolymerization is realized, meanwhile, the specific surface energy of a powder is greatly reduced, and a monodispersed nano-calcium carbonate product is achieved.

Description

technical field [0001] The invention relates to the technical field of preparation and processing of nano calcium carbonate powder, in particular to a preparation method of low surface energy monodisperse nano calcium carbonate. Background technique [0002] Nano-calcium carbonate, as a new type of functional nano-filler with excellent performance, is widely used in industries such as rubber, plastic, paper, paint, textile, ink, toothpaste, cosmetics, daily necessities, food, and medicine as additives and reinforcing agents. It can not only fill and increase volume, reduce cost, 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 nano-calcium carbonate, the primary grains formed during carbonization are easy to agglomerate to form secondary agglomerates, which cannot be effectively dispersed even through subsequent surface mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCY02P20/141
Inventor 莫淑一何丽秋龙飞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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