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A kind of potassium aluminosilicate nanogel precursor additive and its application in low calcium system geopolymer

A technology of nano-gel and potassium aluminosilicate, applied in cement production, etc., can solve problems such as hindering the promotion of the construction field, uneven hydration process, and affecting workability

Active Publication Date: 2022-05-24
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the unstable performance of geopolymers hinders the promotion in the field of construction
In particular, a class of low-calcium system geopolymers such as metakaolin has the following problems: unstable mechanical properties, uneven hydration process affects workability and internal pore distribution of components, and excessive shrinkage, easy to crack, etc.

Method used

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  • A kind of potassium aluminosilicate nanogel precursor additive and its application in low calcium system geopolymer
  • A kind of potassium aluminosilicate nanogel precursor additive and its application in low calcium system geopolymer
  • A kind of potassium aluminosilicate nanogel precursor additive and its application in low calcium system geopolymer

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preparation example Construction

[0019] In the present invention, the preparation method of the potassium aluminosilicate nanogel precursor additive preferably includes the following steps:

[0020] The potassium hydroxide, nano-silica, nano-alumina and water are mixed to carry out a hydrothermal synthesis reaction to obtain the potassium aluminosilicate nano-gel precursor admixture.

[0021] In the present invention, unless otherwise specified, all raw material components are commercially available commodities well known to those skilled in the art.

[0022] In the present invention, the mass ratio of the potassium hydroxide, nano-silica, nano-alumina and water is preferably (4-15): (1.5-4): (0.75-2): (30-100), more Preferably (5-12): (2-3.5): (0.8-1.5): (40-80), most preferably (8-10): (2.5-3): (1-1.2): (50- 80). In the present invention, the water is preferably deionized water.

[0023] In the present invention, the temperature of the mixing is preferably 70-100°C, more preferably 75-95°C, and most pref...

Embodiment 1

[0031] Add 300 parts of deionized water and 30 parts by mass of KOH to the Teflon reaction tank, put the Teflon tank into a water bath with a stirring speed of 200r / min and 95°C, and add it after the temperature rises to 95°C. 16 parts by mass of nano-SiO with a particle size of 50 to 100 nm 2Stir for 2min, add 14 parts by mass of nano-Al with a particle size of 50-100nm 2 O 3 After stirring for 2 minutes, take out the polytetrafluoroethylene tank and seal it with plastic wrap and adhesive tape, then continue to stir in the water bath for 1 hour, turn off the stirring knob, and let it stand at 95 °C for a constant temperature hydrothermal synthesis reaction for 4 hours. Centrifuge at a speed of 4000 r / min for 4 min, pour off the liquid components, add deionized water, stir and mix, continue to centrifuge at a speed of 4000 r / min for 4 min, and repeat centrifugal washing 3 times to obtain potassium aluminosilicate nanogel precursor. agent;

[0032] In the potassium aluminosi...

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Abstract

The invention provides a potassium aluminosilicate nano-gel precursor external additive and its application in low-calcium geopolymers, belonging to the technical field of geopolymer additives. The potassium aluminosilicate nanogel precursor external additive provided by the present invention has a structure of a highly active potassium aluminosilicate short-chain structure, and is a precursor of a low-calcium system polymer, and its chemical composition includes K 2 O, SiO 2 and Al 2 o 3 , the K / Si molar ratio is 1.0-4.0, and the Al / Si molar ratio is 0.25-1.5. The potassium aluminosilicate nanogel precursor external additive provided by the present invention is added to the low-calcium system polymer matrix material, which can effectively optimize the hydration process of the low-calcium system polymer such as metakaolin, balance internal reactions, and improve pores structure, thereby improving the mechanical properties. It effectively solves the problems of harsh curing conditions, uneven hydration reaction, and substandard mechanical properties of low-calcium geopolymers, and provides a feasible solution for the application of low-calcium geopolymers.

Description

technical field [0001] The invention relates to the technical field of geopolymer admixtures, in particular to a potassium aluminosilicate nanogel precursor admixture and its application in a low-calcium system geopolymer. Background technique [0002] Geopolymer is a new type of gel material, which has the advantages of environmental protection and energy saving in the production process, simple process and excellent durability. Therefore, it has been of high research value since the last century. [0003] However, the unstable properties of geopolymers hinder the popularization in the construction field. In particular, a class of low-calcium geopolymers such as metakaolin has the following problems: unstable mechanical properties, uneven hydration process affecting workability and pore distribution inside components, excessive shrinkage, and easy cracking. [0004] my country is the world's major kaolin producer, accounting for 78% of the world's total output; there are m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06C04B7/26C04B12/00
CPCC04B40/0039C04B7/243C04B12/005C04B22/062C04B22/06Y02P40/10
Inventor 方媛郑淑怡邢锋
Owner SHENZHEN UNIV
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