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CN-121974646-A - Composite cementing material and preparation method thereof

CN121974646ACN 121974646 ACN121974646 ACN 121974646ACN-121974646-A

Abstract

The invention relates to the technical field of cement cementing materials and discloses a composite cementing material and a preparation method thereof, wherein the composite cementing material comprises (1.5-2.3) g (1.5-45) g (22-36) g (9-20) g (18-35) g (5-18) g (30-38) g of cement, gypsum powder, mineral powder, steel slag powder, superfine powder of fly ash, sulfonate styrene-butadiene latex and water according to the proportion of (32-45) g (30-38) g, and the styrene-butadiene rubber is introduced with a large amount of hydrophilic sodium sulfonate groups, so that the dispersibility of the styrene-butadiene rubber in water is improved, the aggregation of the styrene-butadiene rubber in the latex is reduced, the sulfonate styrene-butadiene rubber in the latex forms a continuous compact and uniformly dispersed viscoelastic polymer film in a cementing material matrix, a good cementing effect is achieved, the compactness and the integrity of the cementing material are improved, and the compressive strength and the breaking strength of the cementing material are improved.

Inventors

  • WANG HONGTAO
  • WANG ZHENZHONG
  • LIN YUN
  • LI HUI
  • QIU HAICHAO
  • LUO DONGYANG

Assignees

  • 天津宏生建材科技有限公司

Dates

Publication Date
20260505
Application Date
20260112

Claims (8)

  1. 1. The composite cementing material is characterized by comprising the following components of cement, gypsum powder, mineral powder, steel slag powder, superfine powder of fly ash, sulfonate styrene-butadiene latex and water, wherein the total weight ratio of the cement, the gypsum powder, the mineral powder, the steel slag powder, the superfine powder of fly ash, the sulfonate styrene-butadiene latex and the water is (32-45), the cement is (1.5-2.3), the sulfonate styrene-butadiene latex is (22-36), the cement is (9-20), the mineral powder is (18-35) and the steel slag powder is (5-18); The preparation method of the sulfonate styrene-butadiene latex comprises the following steps: (1) Adding cyclohexane and styrene-butadiene rubber into a reaction kettle, heating and stirring, adding 1-thioglycerol and azodiisobutyronitrile, reacting, distilling under reduced pressure, washing the product, and drying to obtain a styrene-butadiene rubber precursor; (2) Adding N, N-dimethylacetamide and styrene-butadiene rubber precursors into a reaction kettle, stirring, adding aqueous solution of sodium hydroxide and 1, 3-propane sultone, reacting, distilling under reduced pressure, washing the product, adding into water, stirring and dispersing to obtain sulfonate styrene-butadiene latex.
  2. 2. The composite cementing material according to claim 1, wherein the ratio of the styrene-butadiene rubber, the 1-thioglycerol and the azodiisobutyronitrile in the (1) is 100g (30-120) mmol (4-15) mmol.
  3. 3. The composite cementitious material of claim 1, wherein the reacting in (1) is performed at 70-80 ℃ for 1-3 hours.
  4. 4. The composite cementing material according to claim 1, wherein the ratio of the styrene-butadiene rubber precursor, sodium hydroxide and 1, 3-propane sultone in (2) is 100g (60-250) mmol (80-300) mmol.
  5. 5. The composite cementitious material of claim 1, wherein the aqueous solution of sodium hydroxide in (2) has a mass fraction of 6-10mol/L.
  6. 6. The composite cementitious material of claim 1, wherein the reaction in (2) is performed at 60-80 ℃ for 6-10 hours.
  7. 7. The method for preparing the composite cementing material according to any one of claims 1 to 6, which comprises the steps of adding cement and gypsum powder into water, mixing and dispersing, then adding mineral powder, steel slag powder, superfine powder of fly ash, gypsum powder and sulfonate styrene-butadiene latex, mixing and dispersing, pouring into a mould for compaction and defoaming, and curing and molding after demoulding to obtain the composite cementing material.
  8. 8. The method for preparing a composite cementitious material of claim 7, wherein the curing time is 7-28 days, the temperature is 20-30 ℃, and the relative humidity is 90-95%.

Description

Composite cementing material and preparation method thereof Technical Field The invention relates to the technical field of cement cementing materials, in particular to a composite cementing material and a preparation method thereof. Background The inorganic cementing material is a common building engineering material, and the main components of the inorganic cementing material comprise cement, gypsum, pulverized coal ash, slag powder and the like, and has good heat resistance, freezing resistance, corrosion resistance and the like. The cement cementing material is widely applied to civil construction, road and bridge, ocean process and other aspects, and in order to improve the mechanical strength, water resistance, permeability resistance and other performances of the cement cementing material, additives such as polymers, exciting agents, water reducing agents and the like can be adopted for modification. The styrene-butadiene latex has high strength, high flexibility and good water resistance, and can improve the performances of cracking resistance, water resistance and the like when being added into materials such as cement, concrete and the like. The patent with publication number CN109438621B discloses a functional styrene-butadiene copolymer latex, a preparation method and application thereof, and the prepared functional styrene-butadiene copolymer contains hydroxyl, polymerizable double bonds and other structures and can be used as a functional additive of cement mortar and concrete, but the functional styrene-butadiene copolymer of the patent does not improve the mechanical properties of the cement cementing material such as fracture resistance, compression resistance and the like. Disclosure of Invention The invention provides a composite cementing material and a preparation method thereof, aiming at the defects of the prior art, and solves the problem of lower mechanical strength of cement-based cementing materials. In order to solve the technical problems, the invention adopts the technical scheme that the preparation method of the composite cementing material comprises the following steps: (1) Adding cyclohexane and styrene-butadiene rubber into a reaction kettle, heating and stirring, adding 1-thioglycerol and azodiisobutyronitrile, reacting, distilling under reduced pressure, washing the product with ethanol, and drying to obtain a styrene-butadiene rubber precursor. (2) Adding N, N-dimethylacetamide and styrene-butadiene rubber precursors into a reaction kettle, stirring, adding aqueous solution of sodium hydroxide and 1, 3-propane sultone, reacting to generate sulfonate styrene-butadiene rubber, distilling under reduced pressure, washing the product with ethanol, adding into water, stirring and dispersing to obtain sulfonate styrene-butadiene rubber latex. The reaction formula is as follows: 。 (3) Adding cement and gypsum powder into water, mixing and dispersing, then adding mineral powder, steel slag powder, superfine powder of fly ash and sulfonate styrene-butadiene latex, mixing and dispersing, pouring into a mould for compaction and defoaming, demoulding, curing and forming to obtain the composite cementing material. Further, the ratio of styrene-butadiene rubber, 1-thioglycerol and azobisisobutyronitrile in (1) is 100g (30-120) mmol and (4-15) mmol. Further, the reaction in (1) is carried out at 70-80℃for 1-3 hours. Further, the ratio of the styrene-butadiene rubber precursor, sodium hydroxide and 1, 3-propane sultone in (2) is 100g (60-250 mmol) and (80-300 mmol). Further, the mass fraction of the aqueous solution of sodium hydroxide in (2) is 6-10mol/L. Further, the reaction in (2) is carried out at 60-80℃for 6-10 hours. Further, the proportion of cement, gypsum powder, mineral powder, steel slag powder, superfine powder of fly ash, sulfonate styrene-butadiene latex and water in the step (3) is (32-45) g (1.5-2.3) g (22-36) g (9-20) g (18-35) g (5-18) g (30-38) g. Further, the curing and molding time in the step (3) is 7-28 days, the temperature is 20-30 ℃, and the relative humidity is 90-95%. The technical scheme has the beneficial effects that the addition reaction is carried out on the 1-thioglycerol containing a plurality of hydroxyl groups and the alkenyl of the styrene-butadiene rubber, then the ring opening reaction is carried out on the hydroxyl groups and the 1, 3-propane sultone, the mixture is added into water to obtain sulfonate styrene-butadiene latex, and finally the sulfonate styrene-butadiene latex is compounded with mineral powder, steel slag powder, superfine powder of fly ash and the like to obtain the composite cementing material. According to the invention, a large amount of hydrophilic sodium sulfonate groups are introduced into the styrene-butadiene rubber, so that the dispersibility of the styrene-butadiene rubber in water is improved, and the aggregation of the styrene-butadiene rubber in the latex is reduced, so that a more uniformly dispersed latex emulsion