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CN-122010448-A - Powder accelerator master batch with high aluminum-sulfur ratio and preparation method and application thereof

CN122010448ACN 122010448 ACN122010448 ACN 122010448ACN-122010448-A

Abstract

The invention discloses a powder accelerator master batch with high aluminum-sulfur ratio and a preparation method and application thereof, wherein the preparation method comprises the following steps of 1, carrying out blending airtight reaction on an inorganic aluminum source and fluosilicic acid, simultaneously dropwise adding concentrated sulfuric acid to promote the reaction to quickly raise the temperature, damaging the molecular structure of the inorganic aluminum source and obtaining a reaction liquid a, 2, adding magnesium salt, a stabilizer and organic amine into the reaction liquid a prepared in the step 1, sealing the reaction kettle, carrying out high-temperature pressured reaction, and obtaining a reaction liquid b by leading fluorine ions into a product crystal phase under the condition of high-temperature pressured reaction, and 3, introducing the high-temperature reaction liquid b prepared in the step 2 into a grinding and crushing device, and carrying out natural cooling, drying, crushing and grinding to obtain the powder accelerator master batch with high aluminum-sulfur ratio, wherein the inorganic aluminum source comprises aluminum hydroxide and gamma-alumina. The accelerator is an organic-inorganic complex composite material, has a high fluorine ion curing effect and high product stability, and has a remarkable effect of improving the strength of concrete, wherein the aluminum-sulfur ratio is 1:0.9-1:1.3.

Inventors

  • ZHU BOSONG
  • WU JINGZHI
  • WANG WEI
  • FENG PAN
  • HONG JINXIANG
  • ZHAO SHUANG
  • ZENG LUPING
  • CHEN JUNSONG
  • DU SHUANG
  • WU QINGYONG

Assignees

  • 江苏苏博特新材料股份有限公司
  • 四川苏博特新材料有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The preparation method of the powder accelerator master batch with high aluminum-sulfur ratio is characterized by comprising the following steps of: step 1, inorganic aluminum source and fluosilicic acid are blended and hermetically reacted, concentrated sulfuric acid is added dropwise to promote the reaction to quickly raise the temperature, and the molecular structure of the inorganic aluminum source is destroyed to obtain a reaction solution a; step 2, adding magnesium salt, stabilizer and organic amine into the reaction solution a prepared in the step 1, sealing the reaction kettle, carrying out high-temperature pressured reaction, and obtaining a reaction solution b by enabling fluoride ions to enter a product crystal phase under the high-temperature pressured condition; step 3, introducing the high-temperature reaction liquid b prepared in the step 2 into a grinding and crushing device, naturally cooling, drying, crushing and grinding to prepare a powder accelerator master batch with high aluminum-sulfur ratio; The inorganic aluminum source includes aluminum hydroxide and gamma-alumina.
  2. 2. The preparation method of the powder accelerator master batch with the high aluminum-sulfur ratio, which is disclosed in claim 1, is characterized in that the ratio of an inorganic aluminum source to concentrated sulfuric acid is (50-78): (82-128), and the mass ratio of the inorganic aluminum source to fluosilicic acid, magnesium salt, stabilizer and organic amine is (50-78): (58-230): (2-12): (3-26): (7-50) preferably.
  3. 3. The method for preparing the powder accelerator master batch with high aluminum-sulfur ratio according to claim 1, wherein the reaction pressure in the step 2 is 0.1-0.6 MPa.
  4. 4. The method for preparing the powder accelerator master batch with high aluminum-sulfur ratio according to claim 1, wherein the organic amine is any one or more of alcohol amine and catecholamine, preferably diethanolamine, triethanolamine and triisopropanolamine, dopamine and epinephrine.
  5. 5. The method for preparing the powder accelerator master batch with high aluminum-sulfur ratio according to claim 1, wherein the stabilizer is any one or more of fumed silica, sepiolite, attapulgite and hydrous magnesium silicate.
  6. 6. The method for preparing the powder accelerator master batch with high aluminum-sulfur ratio according to claim 1, wherein the reaction temperature in the step 2 is in the range of 90-130 ℃.
  7. 7. The preparation method of the powder accelerator master batch with high aluminum-sulfur ratio according to claim 1, wherein the reaction time of the step 2 is 30-120 min.
  8. 8. A powder accelerator master batch with high aluminum-sulfur ratio, which is characterized by being prepared by the preparation method of any one of claims 1 to 7.
  9. 9. The application of the high-aluminum-sulfur-ratio powder accelerator master batch disclosed in claim 1 is characterized in that the addition amount of the high-aluminum-sulfur-ratio powder accelerator master batch is 4-6% of the total mass of a cementing material.
  10. 10. The application of the high-aluminum-sulfur-ratio powder accelerator master batch according to claim 9, wherein the high-aluminum-sulfur-ratio powder accelerator master batch is configured to be a liquid accelerator, and the addition amount of the high-aluminum-sulfur-ratio powder accelerator master batch is 6-9% of the total mass of a cementing material.

Description

Powder accelerator master batch with high aluminum-sulfur ratio and preparation method and application thereof Technical Field The invention belongs to the field of concrete additives, and in particular relates to a powder accelerator master batch with high aluminum-sulfur ratio, and a preparation method and application thereof. Background In recent years, the field of alkali-free accelerator has developed rapidly, and the number of industry patents has increased significantly. However, due to the limited transportation distance, each manufacturer performs performance compression on the liquid alkali-free accelerator again and again to control the cost, so that the comprehensive performance of the liquid alkali-free accelerator is reduced, and the problems of product stability and cement adaptability are particularly outstanding. In actual construction, in order to achieve the coagulation effect, the mixing amount of the liquid accelerator is often required to be increased on a construction site, so that the rebound rate of the concrete is high, and the material loss and the construction cost are increased. Therefore, the powder alkali-free accelerator shows better application prospect. Through intensive researches on published patents and documents, the powder accelerator is prepared by adopting a compounding scheme in the prior powder alkali-free accelerator such as patent CN113264711A, CN117534362B, CN115677255B, CN112142359B, and no alkali-free powder accelerator product prepared by adopting a synthetic process path exists yet. In the compounding scheme, most of the components are soluble salts or organic phases, and the compounding dissolution time is long, so that the stability of the product is poor. At present, the main raw material of the alkali-free accelerator is aluminum sulfate, and the aluminum sulfate content in the product is generally between 40% and 70%. With the continuous increase of the aluminum sulfate content, the excessive SO 4²- introduced into the accelerator can obviously increase the risk of secondary ettringite generation inside the concrete. This problem not only results in a later loss of strength of the concrete, but is more likely to cause sulfate attack, severely compromising its long-term durability. In the prior art, in order to reduce the sulfur content, in a patent CN113135689A, a plurality of accelerator components are compatible, wherein the first accelerator component is aluminum sulfate octadecatried, the second accelerator component is aluminum dihydrogen phosphate, and the third accelerator component is sodium metaaluminate, so that the characteristic of low sulfur is achieved, but the aluminum dihydrogen phosphate is easy to absorb water and wet and agglomerate, thereby causing unstable performance, and the application of the aluminum dihydrogen phosphate is limited by high price. The patent CN111377649B is based on the use of aluminum nitrate instead of aluminum sulfate to achieve the purpose of low sulfur, but since aluminum nitrate is an explosive product, there are many limitations in production. The low-sulfur accelerator exists in a liquid form, and if powder is required to be prepared again, spray drying equipment and the like are required to be assisted, and the finished product cannot be ensured to have good uniformity. In view of this, the present invention is directed to providing a novel powder accelerator masterbatch with a high aluminum to sulfur ratio to make up for the deficiencies of the prior art. Disclosure of Invention The invention aims at providing a powder accelerator master batch with high aluminum-sulfur ratio, a preparation method and application thereof, and an organic-inorganic complex composite material is obtained through a chemical synthesis process path, wherein the aluminum-sulfur ratio is between 1:0.9 and 1:1.3. Meanwhile, the product has strong fluoride ion curing effect and has obvious effect of improving the strength of concrete. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A preparation method of a powder accelerator master batch with high aluminum-sulfur ratio comprises the following steps: step 1, inorganic aluminum source and fluosilicic acid are blended and hermetically reacted, concentrated sulfuric acid is added dropwise to promote the reaction to quickly raise the temperature, and the molecular structure of the inorganic aluminum source is destroyed to obtain a reaction solution a; step 2, adding magnesium salt, stabilizer and organic amine into the reaction solution a prepared in the step 1, sealing the reaction kettle, carrying out high-temperature pressured reaction, and obtaining a reaction solution b by enabling fluoride ions to enter a product crystal phase under the high-temperature pressured condition; step 3, introducing the high-temperature reaction liquid b prepared in the step 2 into a grinding and crushing device, naturally cooling, drying, crushing a