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CN-117865515-B - Ultrahigh-strength solid-carbon gel material and preparation method thereof

CN117865515BCN 117865515 BCN117865515 BCN 117865515BCN-117865515-B

Abstract

The invention discloses an ultra-high strength solid carbon gel material and a preparation method thereof. The preparation method comprises the steps of uniformly mixing a carbon-fixing gel material, an amphiphilic block copolymer and water to obtain a mixture, and carrying out molding, carbonization and maintenance on the mixture to obtain the ultra-high-strength carbon-fixing gel material. The invention creatively utilizes the amphiphilic block copolymer as a carbonization enhancer of the solid carbon gel material, so that the mechanical property of the solid carbon gel material is greatly improved, the amphiphilic block copolymer can regulate and control the crystal form of a carbonized product, and the amphiphilic block copolymer is combined with calcium ions to form hydrogel with an ion crosslinking network to be filled in pores, and can be used as a template of calcium carbonate crystallization to form a carbon organic-inorganic composite structure, so that calcium carbonate crystal grains grow in an oriented manner, the combination between calcium carbonate crystals is improved, and the mechanical property of the material is greatly improved.

Inventors

  • LIU ZHICHAO
  • CHEN JINGZE
  • WANG FAZHOU
  • HU SHUGUANG

Assignees

  • 武汉理工大学

Dates

Publication Date
20260512
Application Date
20240108

Claims (7)

  1. 1. The preparation method of the ultra-high strength solid carbon gel material is characterized by comprising the following steps of: uniformly mixing a carbon-fixing gel material, an amphiphilic block copolymer and water to obtain a mixture; the mixture is molded, carbonized and maintained to obtain an ultra-high strength solid carbon gel material; the solid carbon gelling material is at least one of calcium silicate mineral and industrial solid waste with the calcium silicate mineral content not lower than 50%, wherein the calcium silicate mineral is at least one of gamma-dicalcium silicate, monocalcium silicate and tricalcium disilicate; The amphiphilic block copolymer comprises two types of chain segments, wherein a first chain segment contains carboxyl and/or carboxylate ions, and a second chain segment contains polar groups; the molecular weight of the amphiphilic block copolymer is 4000-200000.
  2. 2. The method for preparing an ultra-high strength solid carbon gel material according to claim 1, wherein the molecular weight of the amphiphilic block copolymer is 50000-100000.
  3. 3. The method for preparing an ultra-high strength solid carbon gel material according to claim 1, wherein the amount of the amphiphilic block copolymer is 0.1% -3% of the solid carbon gel material.
  4. 4. The method for preparing an ultra-high strength solid carbon gel material according to claim 1, wherein the amount of the amphiphilic block copolymer is 1.5% -2.5% of the solid carbon gel material.
  5. 5. The method for preparing an ultra-high strength solid carbon gel material according to claim 1, wherein the mass ratio of the solid carbon gel material to water is 1 (0.1-0.2).
  6. 6. The preparation method of the ultra-high strength carbon-fixing gel material according to claim 1, wherein the molding mode is compression molding, the pressure of the compression molding is 30-100MPa, the dwell time is 1-5min, and the carbonization maintenance condition is that the air pressure is 0.1-0.5MPa, the carbon dioxide concentration is 5-100%, and the time is 1-24h.
  7. 7. An ultra-high strength solid-carbon gelling material, characterized in that it is obtained by the process for producing an ultra-high strength solid-carbon gelling material according to any one of claims 1-6.

Description

Ultrahigh-strength solid-carbon gel material and preparation method thereof Technical Field The invention relates to the technical field of solid carbon gel materials, in particular to an ultra-high strength solid carbon gel material and a preparation method thereof. Background The cement industry is a recognized carbon dioxide emission amplifier, and the annual emission of carbon dioxide in the whole global cement industry exceeds 20 hundred million metric tons and accounts for 8% of the total global carbon emission, and along with the aggravation of the greenhouse effect, the reduction of the emission of carbon dioxide is almost the same, so that the preparation and the application of the solid carbon gelling material become one of important measures for realizing energy conservation and emission reduction in the cement building material industry. The origin of the solid carbon gelling material can be traced to the 70S of the last century, and r.l. berger et al found that carbonization can promote hydration reaction of calcium silicate minerals and that even calcium silicate minerals having extremely low hydration activity such as CS, γ -C 2 S, etc. have higher carbonization activity and can obtain higher strength in an extremely short time. This series of studies demonstrate that almost all basic calcium silicate minerals in cement have carbonization activity, opening a new door for the development of building materials. In recent years, carbonization of calcium silicate minerals has become a research hotspot due to the improvement of carbonization processes. Sixue Zhao et al (Carbonation reactivity enhancement ofγ-C2S through biomineralization.Journal of CO2 Utilization,2020,39:101183) promote nucleation and growth of carbonized products by adding calcite seeds as nucleation sites, thereby enabling gamma-C 2 S to have higher carbonization activity. The invention patent CN111393049A discloses an activation modification method of gamma-C 2 S, wherein after gamma-C 2 S is doped and sintered by metal ions, the metal ions are enriched at the grain boundary position and replace part of calcium ions to form a continuous solid solution, the compressive strength of carbonized products prepared by activated gamma-C 2 S is improved from 50MPa to 70MPa, the invention patent CN111574137A discloses a shell-like mother-of-pearl layer material with a layered structure and a preparation method thereof, the shell-like mother-of-pearl layer material with the layered structure is obtained by combining a freezing casting technology and a carbonization technology, the obtained material has higher fracture toughness and durability, the compressive strength reaches 160MPa, the tensile strength reaches 60MPa, and the invention patent CN111018383A discloses a preparation method of a chitosan reinforced carbonized hardened body, which utilizes chitosan to regulate and control the crystal form of carbonized products, so as to promote the dissolution of calcium ions and promote the carbonization reaction, and the compressive strength of the carbonized hardened body is improved from 86MPa to 144MPa for 24 h. The mechanical property is one of the most important indexes of the building material, which is always the focus of scientific researchers, but the mechanical property of the material prepared by carbonization maintenance in the current research still can not meet the market demand, and the space is greatly improved. Disclosure of Invention The invention aims to overcome the technical defects, and provides an ultra-high strength carbon-fixing gel material and a preparation method thereof, which solve the technical problem that the mechanical property of carbon-fixing gel in the prior art is still to be improved. In a first aspect, the invention provides a method for preparing an ultra-high strength solid carbon gel material, comprising the following steps: uniformly mixing a carbon-fixing gel material, an amphiphilic block copolymer and water to obtain a mixture; And (3) molding, carbonizing and curing the mixture to obtain the ultra-high strength solid-carbon gel material. In a second aspect, the present invention provides an ultra-high strength solid-carbon gelling material obtained by the process for the preparation of an ultra-high strength solid-carbon gelling material according to the first aspect of the present invention. Compared with the prior art, the invention has the beneficial effects that: The invention creatively utilizes the amphiphilic block copolymer as a carbonization enhancer of the solid carbon gel material, so that the mechanical property of the solid carbon gel material is greatly improved, the amphiphilic block copolymer can regulate and control the crystal form of a carbonized product, and the amphiphilic block copolymer is combined with calcium ions to form hydrogel with an ion crosslinking network to be filled in pores, and can be used as a template of calcium carbonate crystallization to form a carbon