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A kind of modified hydrotalcite and its preparation method and application

A technology for modifying water and hydrotalcite, which is applied in the field of building materials and chemical building materials. It can solve the problems of limited ability to absorb and solidify sulfate radicals, and small specific surface area of ​​barium salts, so as to improve corrosion resistance, durability, and freezing. The effect of durability

Active Publication Date: 2022-04-29
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Description
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  • Application Information

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Problems solved by technology

CN201410535703.4 adds barium sulfide or barium sulfate to concrete, which reacts with sulfate to generate barium sulfate to reduce the impact of sulfate, but the specific surface area of ​​this form of barium salt is small, and the ability to absorb and solidify sulfate is limited

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  • A kind of modified hydrotalcite and its preparation method and application

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[0031] The embodiment of the present invention proposes a method for preparing modified hydrotalcite, comprising the following steps:

[0032] 1) Mix 35-70 parts by mass of aluminum material, 15-50 parts by mass of barium material and 15-50 parts by mass of magnesium material, stir evenly, add water to dissolve, stir and heat, add sodium carbonate or hydrogen dropwise Sodium oxide, adjust the pH to 8-10, then react at 60-80°C for 3-4 hours, suction filter, dry, and roast at 100-300°C for 2 hours to obtain aluminum-magnesium-barium hydrotalcite;

[0033] 2) Mix 90-99 parts by mass of aluminum-magnesium-barium hydrotalcite and 1-10 parts by mass of surface modifier, react for 1-2 hours, and roast at 120-180° C. for 2-3 hours to obtain modified hydrotalcite.

Embodiment 1

[0036] This embodiment provides a modified aluminum magnesium barium hydrotalcite NCC-58, the preparation method of the modified aluminum magnesium barium hydrotalcite comprises the following steps:

[0037] Put 1000g of aluminum nitrate nonahydrate, 170g of magnesium carbonate and 250g of barium carbonate into the reaction kettle and stir evenly, add 500g of water, mechanically stir at 250r / min, add sodium carbonate dropwise, adjust the pH to 10, heat in a water bath to 70°C, and react for 3h , suction filtered, dried and then roasted at 300°C for 2 hours to obtain aluminum magnesium barium hydrotalcite.

[0038] Add 1000g of aluminum magnesium barium hydrotalcite and 100g of γ-mercaptopropyltriethoxysilane into the reaction kettle, stir for 2 hours, and roast at 160°C for 2 hours to obtain modified aluminum magnesium barium hydrotalcite NCC-58.

Embodiment 2

[0040]This embodiment provides a modified aluminum magnesium barium hydrotalcite CCC-55, the preparation method of the modified aluminum magnesium barium hydrotalcite comprises the following steps:

[0041] Put 350g of aluminum carbonate, 170g of magnesium carbonate and 400g of barium carbonate into the reaction kettle and stir evenly, add 500g of water, mechanically stir at 250r / min, add sodium carbonate dropwise, adjust the pH to 9, heat in a water bath to 60°C, react for 3h, pump After filtration and drying, calcinate at 200°C for 2 hours to obtain aluminum magnesium barium hydrotalcite.

[0042] Add 1000g of aluminum magnesium barium hydrotalcite and 50g of 3-aminopropyltriethoxysilane into the reaction kettle, stir for 2 hours, and roast at 180°C for 2 hours to obtain modified aluminum magnesium barium hydrotalcite CCC-55.

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Abstract

The invention provides a modified hydrotalcite and its preparation method and application. The modified hydrotalcite raw material includes aluminum-magnesium-barium hydrotalcite and a surface modifier, and the aluminum-magnesium-barium hydrotalcite is prepared from the following raw materials in parts by mass: 35-70 parts of aluminum material, 15-50 parts of barium material, Magnesium material 15-50 parts. The modified hydrotalcite provided by the invention is used in marine concrete to play the role of "external resistance and internal absorption", and the concrete's sulfate erosion resistance and chloride ion penetration resistance are significantly improved, and the durability of the concrete is improved.

Description

technical field [0001] The invention relates to the technical fields of building materials and chemical building materials, in particular to a modified hydrotalcite and its preparation method and application. Background technique [0002] Water is an indispensable material for concrete preparation. Cement produces calcium silicate hydrate through hydration reaction to agglomerate various aggregates of concrete into artificial stone. However, harmful ions such as chloride ions and sulfate ions in the external environment will also soak into the concrete along with the water, affecting the durability of the concrete. [0003] At present, concrete engineering construction is gradually expanding to the ocean, but chloride ions and sulfate ions in seawater will corrode concrete and affect the durability of concrete. Chloride ions can destroy the passivation film of concrete reinforcement and accelerate the corrosion of reinforcement. Low-concentration chloride ions react with c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06C01F11/00C04B28/00C04B111/24
CPCC04B22/06C01F11/00C04B28/00C04B2201/50C04B2111/24C04B14/06C04B14/02C04B2103/302
Inventor 王肇嘉李扬黄天勇房桂明陈旭峰张增寿
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES