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CN-121361999-B - Mortar containing nano material and preparation method thereof

CN121361999BCN 121361999 BCN121361999 BCN 121361999BCN-121361999-B

Abstract

The invention relates to the technical field of building materials and discloses a mortar containing nano materials and a preparation method thereof, wherein the mortar consists of 70-80 parts by weight of cement, 8-12 parts by weight of fly ash, 0.4-0.5 part by weight of polycarboxylate water reducer, 0.4-0.6 part by weight of hydroxypropyl methylcellulose, 1-2 parts by weight of nano materials, 2-3 parts by weight of modified silk fibroin and 40-50 parts by weight of water. The modified nano silicon dioxide is modified by gamma-aminopropyl triethoxysilane, the modified cubic nano calcium carbonate is modified by fumaric acid, sodium stearate and palmitic acid in a compound mode, and the modified silk fibroin is prepared by grafting and modifying double aminopropyl end-capped polysiloxane. The mortar has the advantages of remarkably improving the mechanical property, durability and crack resistance and controlling the cost by optimizing component matching and modifying treatment of nano materials and silk fibroin.

Inventors

  • WANG YONG

Assignees

  • 中桔(广东)建材科技有限公司

Dates

Publication Date
20260508
Application Date
20251124

Claims (6)

  1. 1. The mortar containing the nano material is characterized by comprising, by weight, 70-80 parts of cement, 8-12 parts of fly ash, 0.4-0.5 part of polycarboxylate water reducer, 0.4-0.6 part of hydroxypropyl methylcellulose, 1-2 parts of nano material, 2-3 parts of modified silk fibroin and 40-50 parts of water; the nano material comprises, by weight, 0.5-1 part of modified cubic nano calcium carbonate and 0.5-1 part of modified nano silicon dioxide; Adding 45mL of absolute ethyl alcohol and 15mL of deionized water into a reactor, mixing to prepare a solution, then adding 1-2g of nano silicon dioxide into the solution, carrying out ultrasonic treatment for 35-40min, then adding 0.04-0.08g of gamma-aminopropyl triethoxysilane into the solution, regulating the pH value of the system to 4 by hydrochloric acid, carrying out reflux reaction for 1-2h at 45-50 ℃, centrifuging, washing and drying after the reaction is finished, thus obtaining the modified nano silicon dioxide; the preparation method of the modified cubic nano calcium carbonate comprises the following steps: a. Placing 2-3g of Ca (OH) 2 in a hypergravity micro-interface reactor, starting a circulating pump and a cooling device, when the reaction temperature reaches 25 ℃, starting a CO 2 gas flowmeter, setting the volume flow to be 3m 3 /h until the reaction end point pH=7, ending the reaction, and turning off the flowmeter and the circulating pump to obtain nano calcium carbonate; b. adding fumaric acid, sodium stearate and palmitic acid into ethanol solvent, performing ultrasonic treatment for 10-15min, mixing to obtain mixed solution, adding the mixed solution into 1-1.8g of nano calcium carbonate, reacting at 65-70deg.C, filtering after the reaction, and drying in an oven to obtain modified cubic nano calcium carbonate.
  2. 2. The nanomaterial-containing mortar of claim 1, wherein the amount ratio of fumaric acid, sodium stearate, palmitic acid, ethanol in step b is 0.02-0.03g:0.031-0.035g:0.02-0.036g:8-10mL.
  3. 3. The nanomaterial-containing mortar of claim 1, wherein the reaction time in step b is 40-45min.
  4. 4. The nanomaterial-containing mortar of claim 1, wherein the modified silk fibroin is prepared by the following steps: S1, adding octamethyl cyclotetrasiloxane, 1, 3-bis (3-aminopropyl) -1, 3-tetramethyl disiloxane and tetramethyl ammonium hydroxide into a reaction bottle, stirring and heating to 85-90 ℃ under the protection of nitrogen to react for 3-4h, then heating to 135-140 ℃ to continue to react for 1-1.5h, vacuumizing by a vacuum pump after the reaction is finished, and distilling under reduced pressure to obtain the double aminopropyl end-capped polysiloxane; S2, adding 40-45mL of silk fibroin solution and 1-2g of double aminopropyl end-capped polysiloxane into a reaction bottle, adding 0.02-0.04g of carbodiimide, stirring at room temperature for 10-12h, pouring into a dialysis bag, and placing on a stirrer for dialysis with distilled water for 3d to obtain the modified silk fibroin.
  5. 5. The nanomaterial-containing mortar of claim 4, wherein the amount of octamethyl cyclotetrasiloxane, 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane, and tetramethylammonium hydroxide in S1 is 20-24 g/19.8-24.6 g/1.31-1.36 g.
  6. 6. A method for preparing the mortar containing the nano material according to any one of claims 1 to 5, wherein the method for preparing the mortar containing the nano material comprises the steps of adding cement, fly ash, a polycarboxylate water reducer, hydroxypropyl methylcellulose, the nano material and modified silk fibroin into a stirrer, stirring for 2 to 3min, then adding water, and stirring for 50 to 60s to obtain the mortar containing the nano material.

Description

Mortar containing nano material and preparation method thereof Technical Field The invention relates to the technical field of building materials, in particular to a mortar containing nano materials and a preparation method thereof. Background The mortar is a basic material with extremely large dosage in the building engineering, and is mainly used for wall plastering, masonry, tile adhesion, heat preservation protection and other scenes, and the performance of the mortar directly influences the durability and the use safety of a building structure. The traditional mortar uses cement, sand stone and water as main raw materials, has the problems of insufficient compressive strength, poor weather resistance and the like although the cost is low, is easy to crack, fall off and other diseases in the long-term use process, and seriously affects the quality of the building engineering. In the prior art, the modification is carried out by adding a water reducing agent, a water retaining agent or a mineral admixture, but the effect is limited. The nanoparticle has extremely small particle size and extremely large specific surface area, and shows unique physicochemical properties, so that the internal structure of the mortar can be optimized through a filling effect when the nanoparticle is applied to the mortar, but the addition of a single nano material is easy to agglomerate, so that the nanoparticle is unevenly dispersed in the mortar, and the modification effect is affected. Therefore, the development of the mortar containing the nano material, which has excellent performance and controllable cost, has important practical significance. Disclosure of Invention Technical problem to be solved Aiming at the defects of the prior art, the invention provides the mortar containing the nano material and the preparation method thereof, and the mortar has better mechanical property, durability and crack resistance. Technical proposal The mortar containing the nano material comprises, by weight, 70-80 parts of cement, 8-12 parts of fly ash, 0.4-0.5 part of a polycarboxylate water reducer, 0.4-0.6 part of hydroxypropyl methylcellulose, 1-2 parts of nano material, 2-3 parts of modified silk fibroin and 40-50 parts of water. Further, the nanomaterial comprises, by weight, 0.5-1 part of modified cubic nano calcium carbonate and 0.5-1 part of modified nano silicon dioxide; The preparation method of the modified nano silicon dioxide comprises the steps of adding 45mL of absolute ethyl alcohol and 15mL of deionized water into a reactor, mixing to prepare a solution, then adding 1-2g of nano silicon dioxide into the solution, carrying out ultrasonic treatment for 35-40min, then adding 0.04-0.08g of gamma-aminopropyl triethoxysilane into the solution, regulating the pH value of the system to 4 by hydrochloric acid, carrying out reflux reaction for 1-2h at 45-50 ℃, centrifuging, washing and drying after the reaction is finished, and obtaining the modified nano silicon dioxide. Further, the preparation method of the modified cubic nano calcium carbonate comprises the following steps: a. Placing 2-3g of Ca (OH) 2 into a hypergravity micro-interface reactor, starting a circulating pump and a cooling device, when the reaction temperature reaches 25 ℃, starting a CO 2 gas flowmeter, setting the volume flow to be 3m 3/h (under standard conditions) until the reaction end point pH=7, ending the reaction, and turning off the flowmeter and the circulating pump to obtain nano calcium carbonate; b. adding fumaric acid, sodium stearate and palmitic acid into ethanol solvent, performing ultrasonic treatment for 10-15min, mixing to obtain mixed solution, adding the mixed solution into 1-1.8g of nano calcium carbonate, reacting at 65-70deg.C, filtering after the reaction, and drying in an oven to obtain modified cubic nano calcium carbonate. Further, the dosage ratio of fumaric acid, sodium stearate, palmitic acid and ethanol in the step b is 0.02-0.03g:0.031-0.035g:0.02-0.036g:8-10mL. Further, the reaction time in the step b is 40-45min. Further, the preparation method of the modified silk fibroin comprises the following steps: S1, adding octamethyl cyclotetrasiloxane, 1, 3-bis (3-aminopropyl) -1, 3-tetramethyl disiloxane and tetramethyl ammonium hydroxide into a reaction bottle, stirring and heating to 85-90 ℃ under the protection of nitrogen to react for 3-4h, then heating to 135-140 ℃ to continue to react for 1-1.5h, vacuumizing by a vacuum pump after the reaction is finished, and distilling under reduced pressure to obtain the double aminopropyl end-capped polysiloxane; S2, adding 40-45mL of silk fibroin solution and 1-2g of double aminopropyl end-capped polysiloxane into a reaction bottle, adding 0.02-0.04g of carbodiimide, stirring at room temperature for 10-12h, pouring into a dialysis bag, and placing on a stirrer for dialysis with distilled water for 3d to obtain the modified silk fibroin. Further, the dosage ratio of the octamethyl cyclo