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A kind of organic additive and its preparation method and application

An admixture and organic technology, applied in the field of organic admixtures and their preparation, can solve the problems of reducing the early strength of cement-based materials, brittleness and easy cracking, etc., and achieve the improvement of mechanical properties, early strength, toughness and impermeability. Effect

Active Publication Date: 2018-07-13
北京水木佳维新材料技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the modern concrete industry, in order to improve the early working performance of cement-based materials and their own defects such as high brittleness and easy cracking in the later stage, water-soluble polymers represented by polycarboxylate superplasticizers and water-dispersed polymers represented by polymer emulsions It is widely used in cement-based materials, but both will significantly change the cement hydration process, which is manifested as inhibiting or delaying cement hydration and reducing the early strength of cement-based materials

Method used

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  • A kind of organic additive and its preparation method and application
  • A kind of organic additive and its preparation method and application
  • A kind of organic additive and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Anionic water-soluble polymers are used to prepare early-strength admixtures, and the raw materials and specific preparation schemes are as follows:

[0029] Molecular weight is 80,000, and mass concentration is 130g of acrylic acid (AA) and isopentenyl polyoxyethylene ether (TPEG) copolymer solution of 5%, and mass concentration is 3.15g of calcium nitrate solution of 40%, and mass concentration is 15% of silicic acid Sodium solution 3.12g.

[0030] Put 130g of copolymer solution into a three-neck flask with constant temperature in a water bath at 25°C, adjust the pH of the copolymer solution to 12 with 1mol / L NaOH solution; first add calcium nitrate solution dropwise, and stir while adding, and the dropping time is 1h; After the addition is completed, add the sodium silicate solution dropwise, and stir while adding dropwise. The dropwise addition time is 1 hour; finally, the preparation is completed.

Embodiment 2

[0032] Anionic water-soluble polymers are used to prepare early-strength admixtures, and the raw materials and specific preparation schemes are as follows:

[0033] The molecular weight is 20,000, the mass concentration is 130g of 5% sodium styrene sulfonate (SSS) autopolymer solution, the mass concentration is 6g of 40% aluminum nitrate solution, and the mass concentration is 5g of 15% sodium silicate solution.

[0034] Put 130g of self-polymer into a three-neck flask with constant temperature in a water bath at 50°C, and adjust the pH of the copolymer solution to 12 with 1mol / L NaOH solution; first add aluminum nitrate solution dropwise, and stir while adding, and the dropping time is 1h; After the addition is completed, add the sodium silicate solution dropwise, and stir while adding dropwise. The dropwise addition time is 1 hour; finally, the preparation is completed.

Embodiment 3

[0036] Cationic water-soluble polymers are used to prepare early-strength admixtures, and the raw materials and specific preparation schemes are as follows:

[0037] Molecular weight is 30,000, and mass concentration is 130g of trimethylaminopropyl methacrylamide chloride (MAPTAC) and isobutylene polyoxyethylene rice (HPEG) copolymer solution that mass concentration is 15%, and mass concentration is 40% calcium nitrate solution 6g, mass concentration Concentration is 15% sodium silicate solution 5g.

[0038] Put 130g of self-polymer into a three-neck flask with constant temperature in a water bath at 50°C, adjust the pH of the copolymer solution to 12 with 1mol / L NaOH solution; first add the sodium silicate solution dropwise, and stir while adding, and the dropping time is 1h; After the dropwise addition is completed, add the calcium nitrate solution dropwise, stir while adding dropwise, and the dropwise addition time is 1 hour; finally complete the preparation.

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Abstract

The invention belongs to the field of additives used for civil engineering construction, and discloses an organic additive, and a preparation method and applications thereof. According to the preparation method, a polymer, a soluble metal salt, and a soluble alkali metal silicate are taken as raw materials, interaction of charged functional groups of the polymer with inorganic ions is adopted, an organic polymer is taken as a template, the soluble metal salt and the soluble alkali metal silicate are added dropwise at the same time or step by step based on the difference of the functional groups of the polymer, and synthesis of organic-inorganic compound nano silicate particles is realized. The organic-inorganic compound nano silicate particles are capable of eliminating inhibition effect of polymer emulsions on cement hydration; cement hydration is promoted by nucleation so as to achieve early strengthening effect; and in addition, adding of organic matters is capable of increasing rupture strength and improving impervious performance of hardened cement-base materials; nanometer scale and micrometer scale combination of polymer organic materials with cement hydration products is realized, the mechanical properties and durability of the hardened cement-base materials are improved, and application prospect is promising.

Description

technical field [0001] The invention belongs to the field of admixtures for civil engineering construction, and in particular relates to an organic admixture and its preparation method and application. Background technique [0002] Cement-based materials (including cement paste, cement mortar and concrete) are currently the most widely used building materials, and their performance is closely related to daily life. Different constructions have different performance requirements for cement-based materials, and the early strength of cement-based materials is an important performance. To improve the early strength of cement-based materials, the common way at present is to add early strength agents to cement-based materials. According to the different main components, early strength agents can be divided into inorganic early strength agents and organic early strength agents. In traditional applications, inorganic early strength agents include calcium chloride, sulfate, nitrate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B24/16C04B24/28C04B103/12
CPCC04B40/0039C04B2103/12C04B24/2647C04B22/08C04B22/085C04B24/163C04B24/2682
Inventor 孔祥明卢子臣
Owner 北京水木佳维新材料技术研究院有限公司
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