CN115745471A - Special additive for wet-mixed mortar and preparation method and application thereof - Google Patents
Special additive for wet-mixed mortar and preparation method and application thereof Download PDFInfo
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- CN115745471A CN115745471A CN202211467199.XA CN202211467199A CN115745471A CN 115745471 A CN115745471 A CN 115745471A CN 202211467199 A CN202211467199 A CN 202211467199A CN 115745471 A CN115745471 A CN 115745471A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 63
- 239000000654 additive Substances 0.000 title claims abstract description 31
- 230000000996 additive effect Effects 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000002562 thickening agent Substances 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 27
- 150000004676 glycans Chemical class 0.000 claims abstract description 26
- 229920001282 polysaccharide Polymers 0.000 claims abstract description 26
- 239000005017 polysaccharide Substances 0.000 claims abstract description 26
- 239000003094 microcapsule Substances 0.000 claims abstract description 22
- 239000006260 foam Substances 0.000 claims abstract description 20
- 239000003381 stabilizer Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 17
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 17
- 238000013329 compounding Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 31
- 206010016807 Fluid retention Diseases 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000001273 butane Substances 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 6
- 150000002430 hydrocarbons Chemical group 0.000 claims description 6
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 6
- 239000000176 sodium gluconate Substances 0.000 claims description 6
- 229940005574 sodium gluconate Drugs 0.000 claims description 6
- 235000012207 sodium gluconate Nutrition 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 239000002086 nanomaterial Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 150000004756 silanes Chemical class 0.000 claims description 4
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical group CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 239000011162 core material Substances 0.000 claims description 2
- 238000007720 emulsion polymerization reaction Methods 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 2
- 150000008130 triterpenoid saponins Chemical class 0.000 claims description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims 1
- -1 polyoxyethylene Polymers 0.000 claims 1
- 238000001308 synthesis method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000012782 phase change material Substances 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 abstract 2
- 239000003431 cross linking reagent Substances 0.000 abstract 1
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 28
- 235000010413 sodium alginate Nutrition 0.000 description 28
- 239000000661 sodium alginate Substances 0.000 description 28
- 229940005550 sodium alginate Drugs 0.000 description 28
- 239000004576 sand Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000007822 coupling agent Substances 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000003823 mortar mixing Methods 0.000 description 2
- 238000000643 oven drying Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000001338 self-assembly Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a special additive for wet-mixed mortar and a preparation method and application thereof. The additive comprises the following components in percentage by weight: 1-2% of composite phase-change water-retaining thickener, 2-4% of air entraining agent, 5-12% of retarder, 0.2-0.5% of foam stabilizer and the balance of water; the using and mixing amount of the binder is 2.5-5% of the binder; wherein the composite phase-change water-retaining thickener is formed by compounding nano marine polysaccharide molecules, phase-change microcapsules and fatty alcohol-polyoxyethylene ether through an azo cross-linking agent. The special additive for wet-mixed mortar provided by the invention can reduce the air loss with time, increase the opening time, cohesiveness and stability of mortar, improve the construction performance, and reduce the influence of the external temperature on the indoor environment due to the phase change material in the mortar.
Description
Technical Field
The invention relates to the field of wet-mixed mortar additives, in particular to a special additive for wet-mixed mortar and a preparation method and application thereof.
Background
With the development of the building industry, the ready-mixed mortar is well popularized and used, the ready-mixed mortar comprises dry-mixed mortar and wet-mixed mortar, the dry-mixed mortar is prepared by uniformly mixing dried fine aggregate, a cementing material and a powder additive according to a certain proportion, then transporting the mixture to a specified place, then adding water and stirring the mixture, and the wet-mixed mortar is similar to commercial concrete, needs to be mixed into a finished product at a stirring station, then is transported to a specified storage container, and can be directly used when needed. Compared with dry-mixed mortar, the wet-mixed mortar can ensure stable quality, avoid secondary stirring and noise and dust pollution of a construction site, simultaneously have more leeway for selecting materials and save the drying cost.
Generally, wet-mixed mortar is composed of cement, fly ash, natural sand, an additive, water and functional components, wherein the proportion of the sand in the mortar is relatively large, which has great influence on the working performance and strength of the wet-mixed mortar, but the lack of the natural sand and the inconvenience in transportation in places such as a cloud and the like cause the great use of the machine-made sand to replace the natural sand. Compared with natural sand, the manufactured sand has irregular appearance and more edges and corners, so that the mortar has poor water retention, heavy powder and mud, and large adsorption capacity to an additive, thereby affecting the performance of the mortar.
Disclosure of Invention
In order to solve the technical problems, the invention provides a special additive for wet-mixed mortar. The special additive for wet-mixed mortar is low-carbon and environment-friendly in raw material and has good water retention performance.
The technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a special additive for wet-mixed mortar, which comprises the following raw materials in percentage by weight: 1-2% of composite phase-change water retention thickening agent, 2-4% of air entraining agent, 5-12% of retarder, 0.2-0.5% of foam stabilizer and the balance of water;
the composite phase-change water-retaining thickener is prepared by compounding nano marine polysaccharide molecules, phase-change microcapsules, fatty alcohol-polyoxyethylene ether and a cross-linked azo.
Further, the special additive for wet-mixed mortar comprises the following raw materials in percentage by weight: 1.5-2% of composite phase-change water-retention thickening agent, 2-2.5% of air entraining agent, 5-8% of retarder, 0.3-0.4% of foam stabilizer and the balance of water.
Further, the preparation method of the composite phase-change water-retention thickener comprises the following steps:
(1) Preparing a nano marine polysaccharide molecule: adding macromolecular marine polysaccharide into deionized water, then adding hydrogen peroxide into the solution of the marine polysaccharide to obtain a mixed solution, heating the mixed solution to 50-60 ℃ through a water bath, and mechanically stirring for 4-8 h; then obtaining micromolecular marine polysaccharide after separation, sedimentation, centrifugation and purification; dissolving the micromolecular marine polysaccharide powder in deionized water to obtain a marine polysaccharide solution with the mass fraction of 10% -60%, standing for 30-60 h at the temperature of 20 +/-5 ℃, and self-assembling marine polysaccharide molecules with a nano structure; the marine polysaccharide molecule with the nano structure prepared by self-assembly can stably exist in a solution for a long time, and the problem of low solubility of the marine polysaccharide molecule can be well solved;
(2) Preparing a phase change microcapsule: taking phase-change paraffin as a core material, and taking toluene-2, 4-diisocyanate and ethylene glycol as reaction monomers, and obtaining phase-change microcapsules by adopting interface synthesis;
(3) Respectively pretreating the nano marine polysaccharide molecules, the phase change microcapsules and the fatty alcohol-polyoxyethylene ether by using an unsaturated silane coupling agent, and then adding K 2 S 2 O 3 The composite phase-change water-retaining thickener is obtained by emulsion polymerization. The silane coupling agent has the chemical formula: RSiX 3 The material is a substance with an amphoteric structure, wherein one part of groups in the molecules of the material can react with chemical groups on the surface of an inorganic substance to form firm chemical bonding, and the other part of groups have the property of being organophilic and can react with or physically wind organic substance molecules, so that two materials with different properties are firmly combined; the hydrolytic functional group X in the structural formula generates alkoxy when meeting water, and the alkoxy can be in phase transition with hydroxyl in the nano marine polysaccharide moleculeThe active hydroxyl on the surface of the microcapsule and the active hydroxyl at the tail end of the fatty alcohol-polyoxyethylene ether react to form a firm covalent bond, so that the coupling effect is realized.
Furthermore, in the preparation method step (1) of the composite phase-change water-retaining thickener, the unsaturated silane coupling agent is vinyl trimethoxy silane.
Furthermore, in the preparation method of the composite phase-change water-retention thickener, in the step (1), the mass fraction of the hydrogen peroxide is 1.0-2.0%.
Furthermore, the mass ratio of the pretreated marine polysaccharide molecules, the phase-change microcapsules and the fatty alcohol-polyoxyethylene ether is 1.0-1.5: 1.0-5.0: 0.5 to 1.5.
Furthermore, the phase change temperature of the phase change microcapsule is 25.0 ℃, the phase change latent heat is 141.51J/g, the particle size is 0.5-1mm, and the encapsulation efficiency is 70% -75%.
Further, the general formula of the fatty alcohol-polyoxyethylene ether is RO (CH) 2 CH 2 O) n H, R is saturated or unsaturated C 12 ～C 18 The hydrocarbon group (2) may be a linear hydrocarbon group or a branched hydrocarbon group, and has a weight average molecular weight of 320 to 450. Preferably, the fatty alcohol-polyoxyethylene ether is lauryl alcohol-polyoxyethylene ether.
Further, the air entraining agent is at least one or a combination of several of fatty alcohol sodium sulfonate, triterpenoid saponin and sodium dodecyl benzene sulfonate.
Further, the retarder is formed by compounding sodium gluconate and 2-phosphate-1, 2, 4-butane tricarboxylate according to the mass ratio of 2.
Further, the foam stabilizer is alkylolamide.
Further, the mixing amount of the additive is 2.5-5% of the mass of the cementing material.
Further, the preparation method of the admixture comprises the following steps: at normal temperature, firstly adding water into a flask with a stirrer, starting stirring, then adding a retarder and a foam stabilizer, stirring for 10-20 min, adding a composite phase-change water-retention thickening agent after dissolution, continuing stirring for 5-10 min, finally adding an air entraining agent, and continuing stirring until the water is completely dissolved.
In a second aspect, the invention provides the use of the admixture for wet-mixed mortar of the first aspect as an admixture for wet-mixed mortar.
The invention has the following beneficial effects:
(1) According to the preparation method, marine polysaccharide molecules are used as raw materials, the preparation method is safe and environment-friendly, the tackifying and elastomer effects and effects of the phase-change microcapsules are combined, the fatty alcohol-polyoxyethylene ether is introduced to serve as a non-surfactant, the ordered distribution of bubble liquid films in the mortar can be controlled, the bubble films are endowed with good elasticity and self-repairing capability, the bubble stabilizing performance of the added alkylolamide foam stabilizer can be promoted, and the gas loss over time is reduced.
(2) The water-retaining thickener prepared by the invention has good water-retaining property, can increase the opening time, cohesiveness and stability of mortar, can improve the construction performance, and can reduce the influence of the outside temperature on the indoor due to the phase change material in the thickener, thereby effectively solving the problems of large air loss, poor water-retaining property and poor construction performance of the mortar due to irregular shape and appearance of machine-made sand, more edges and corners, heavy powder and mud content and the like.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
(1) Preparation of marine polysaccharides with small molecular weight
Adding 15g of sodium alginate with large molecular weight (weight average molecular weight of 313 kDa) into 985g of deionized water, and stirring, swelling and dissolving to obtain a sodium alginate solution A with mass percentage concentration of 1.5%; then, adding 1.5% of hydrogen peroxide by mass to obtain a mixed solution; heating the mixed solution to 55 ℃ in a water bath, and stirring for reaction for 5 hours; adding 1200g of absolute ethyl alcohol into the mixed solution, precipitating and centrifuging to obtain a solid substance with the small molecular weight sodium alginate as a main component; dissolving the obtained solid with deionized water, filtering, and oven drying to obtain pure sodium alginate powder (weight average molecular weight of 74 kDa);
(2) Preparing nano sodium alginate molecules:
adding 10g of the obtained sodium alginate powder with small molecular weight into 90g of deionized water while stirring for dissolving to obtain a sodium alginate solution B with the mass percentage concentration of 10%; standing the obtained sodium alginate solution B for 48h at 20 ℃ to self-assemble sodium alginate molecules with nano structures, namely the nano sodium alginate molecules A.
(3) Preparing a composite phase-change water-retention thickener:
preparing a 2% vinyl trimethoxy silane aqueous solution by mass fraction. Respectively mixing the nano sodium alginate molecule A, the phase-change microcapsule and the lauryl alcohol polyoxyethylene ether with a prepared coupling agent aqueous solution, carrying out ultrasonic treatment for 60min, carrying out suction filtration, and drying a filter cake at 100 ℃. Then, toluene is used as a solvent to carry out centrifugal separation on the pretreated nano sodium alginate molecules and the phase change microcapsules, and the coupling agent self-polymerization product is removed by repeatedly washing for 4 times. Obtaining the pretreated nano sodium alginate molecules, the phase-change microcapsules and the lauryl alcohol polyoxyethylene ether.
Placing a four-mouth bottle provided with a stirrer, a dropping funnel and a thermometer in a water bath, adding 10g of pretreated nano sodium alginate molecules, 10g of pretreated phase-change microcapsules and 5g of pretreated lauryl polyoxyethylene ether, 150mL of water and 0.01g of K into the bottle 2 S 2 O 3 . The reaction temperature is controlled to be 50-60 ℃ and the reaction is carried out for 4h. And drying the reaction product at 80 ℃ to obtain the composite phase change water-retaining thickener A.
Example 2
(1) Preparation of marine polysaccharides with small molecular weight
Adding 15g of high-molecular-weight sodium alginate (with the weight-average molecular weight of 686 kDa) into 985g of deionized water, and stirring, swelling and dissolving to obtain a sodium alginate solution A with the mass percentage concentration of 1.5%; then, adding 1.5% hydrogen peroxide by mass to obtain a mixed solution; heating the mixed solution to 55 ℃ in a water bath, and stirring for reaction for 7 hours; adding 1200g of absolute ethyl alcohol into the mixed solution, precipitating and centrifuging to obtain a solid substance with the small molecular weight sodium alginate as a main component; dissolving the obtained solid with deionized water, filtering, and oven drying to obtain pure sodium alginate powder (weight average molecular weight of 98 kDa) with small molecular weight;
(2) Self-assembly of sodium alginate nano-fibers:
adding 10g of the obtained sodium alginate powder with small molecular weight into 90g of deionized water while stirring for dissolving to obtain a sodium alginate solution B with the mass percentage concentration of 10%; and standing the obtained sodium alginate solution B for 48 hours at the temperature of 20 ℃ to self-assemble sodium alginate molecules with nano structures, namely the nano sodium alginate molecules B.
(3) Preparing a composite phase-change water-retention thickening agent:
preparing a coupling agent aqueous solution with the mass fraction of 2%. Respectively mixing the nano sodium alginate molecule B, the phase change microcapsule and the lauryl polyoxyethylene ether with the prepared coupling agent aqueous solution, carrying out ultrasonic treatment for 60min, carrying out suction filtration, and drying a filter cake at 100 ℃. Then, toluene is used as a solvent to carry out centrifugal separation on the pretreated nano sodium alginate molecules and the phase change microcapsules, and the coupling agent self-polymerization product is removed by repeatedly washing for 4 times. Obtaining the pretreated nano sodium alginate molecules, the phase-change microcapsules and the lauryl alcohol polyoxyethylene ether.
Placing a four-mouth bottle provided with a stirrer, a dropping funnel and a thermometer in a water bath, adding 10g of pretreated nano sodium alginate molecules, 10g of pretreated phase-change microcapsules and 5g of pretreated lauryl polyoxyethylene ether, 150mL of water and 0.01gK 2 S 2 O 3 . The reaction temperature is controlled to be 50-60 ℃ and the reaction is carried out for 4h. And drying the reaction product at 80 ℃ to obtain the composite phase change water-retaining thickener B.
Application example 1
The special additive for the wet-mixed mortar comprises the following raw materials in percentage by weight: 1.5% of composite phase-change water-retention thickening agent, 3% of air entraining agent, 8% of retarder, 0.3% of foam stabilizer and 87.2% of water.
The air entraining agent is sodium dodecyl benzene sulfonate; the retarder is formed by compounding sodium gluconate and 2-phosphate-1, 2, 4-tricarboxylic acid butane according to the mass ratio of 2; the foam stabilizer is alkylolamide.
The preparation method of the special additive for the wet-mixed mortar comprises the following steps: at normal temperature, firstly adding water into a flask with a stirrer, starting stirring, then adding a retarder and a foam stabilizer, stirring for 10-20 min, adding the composite phase-change water-retention thickening agent A after dissolution, continuing stirring for 5-10 min, finally adding the air entraining agent, and continuing stirring until the mixture is completely dissolved.
The special additive for the wet-mixed mortar is added according to the mass of 3.5 percent of the gelled material in the formula.
Application example 2
The special additive for the wet-mixed mortar comprises the following raw materials in parts by weight: 2% of composite phase-change water retention thickening agent, 4% of air entraining agent, 10% of retarder, 0.5% of foam stabilizer and 84.7% of water.
The air entraining agent is sodium dodecyl benzene sulfonate; the retarder is formed by compounding sodium gluconate and 2-phosphate-1, 2, 4-tricarboxylic acid butane according to the mass ratio of 2; the foam stabilizer is alkylolamide.
The preparation method of the special additive for wet-mixed mortar comprises the following steps: at normal temperature, firstly adding water into a flask with a stirrer, starting stirring, then adding a retarder and a foam stabilizer, stirring for 10-20 min, adding the composite phase-change water-retention thickening agent A after dissolution, continuing stirring for 5-10 min, finally adding the air entraining agent, and continuing stirring until the mixture is completely dissolved.
The special additive for the wet-mixed mortar is added according to the mass of 3.5 percent of the gelled material in the formula.
Application example 3
The special additive for the wet-mixed mortar comprises the following raw materials in parts by weight: 1% of composite phase-change water-retention thickening agent, 2% of air entraining agent, 5% of retarder, 0.2% of foam stabilizer and 84.7% of water.
The air entraining agent is sodium dodecyl benzene sulfonate; the retarder is formed by compounding sodium gluconate and 2-phosphate-1, 2, 4-tricarboxylic acid butane according to the mass ratio of 2; the foam stabilizer is alkylolamide.
The preparation method of the special additive for wet-mixed mortar comprises the following steps: at normal temperature, firstly adding water into a flask with a stirrer, starting stirring, then adding a retarder and a foam stabilizer, stirring for 10-20 min, adding the composite phase-change water-retention thickening agent A after dissolution, continuing stirring for 5-10 min, finally adding the air entraining agent, and continuing stirring until the mixture is completely dissolved.
The special additive for the wet-mixed mortar is added according to the mass of 3.5 percent of the gelled material in the formula.
Application example 4
The special additive for the wet-mixed mortar comprises the following raw materials in parts by weight: 1.5 percent of composite phase-change water retention thickener, 3 percent of air entraining agent, 8 percent of retarder, 0.3 percent of foam stabilizer and 87.2 percent of water.
The air entraining agent is sodium dodecyl benzene sulfonate; the retarder is formed by compounding sodium gluconate and 2-phosphate-1, 2, 4-tricarboxylic acid butane according to the mass ratio of 2; the foam stabilizer is alkylolamide. The preparation method of the special additive for wet-mixed mortar comprises the following steps: at normal temperature, firstly adding water into a flask with a stirrer, starting stirring, then adding a retarder and a foam stabilizer, stirring for 10-20 min, adding a composite phase-change water-retention thickening agent B after dissolution, continuing stirring for 5-10 min, finally adding an air entraining agent, and continuing stirring until the water is completely dissolved.
The special additive for the wet-mixed mortar is added according to the mass of 3.5 percent of the gelled material in the formula.
To further illustrate the beneficial effects of the wet-mixed mortar admixture of the present invention, the wet-mixed mortar admixtures prepared in application examples 1-4 were added to cement with the same parameters, and the wet-mixed mortar admixtures not added with the additive prepared in the present invention were introduced as blank comparison items, and their properties such as consistency, stratification, water retention, compressive strength, etc. were tested and recorded in table 2, wherein table 1 is the mortar mixing ratio.
TABLE 1 mortar mixing proportion
TABLE 2 comparison of Properties
As can be seen from Table 2, after 12 hours, the mortar prepared by adding the wet-mixed mortar admixture prepared in the application examples 1 to 4 of the invention has a remarkably reduced air content loss compared with the blank comparison group, after 24 hours, the mortar still maintains a higher consistency compared with the blank comparison item, has a lower initial apparent density and a higher water retention rate, and has a compressive strength after 28 days higher than that of the blank comparison item, in the aspect of construction performance, the application examples 1 to 4 show excellent performances of softness, no delamination and easy construction of the mortar, which shows that after the addition of the wet-mixed mortar admixture of the invention, the performance level of the mortar can be effectively improved, and the problems of short open time, poor water retention, poor construction performance, easy hollowing and cracking after hardening and the like of the wet-mixed mortar are solved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. The special additive for the wet-mixed mortar is characterized by comprising the following raw materials in percentage by weight: 1-2% of composite phase-change water-retaining thickener, 2-4% of air entraining agent, 5-12% of retarder, 0.2-0.5% of foam stabilizer and the balance of water;
the composite phase-change water-retaining thickener is prepared by compounding nano marine polysaccharide molecules, phase-change microcapsules, fatty alcohol-polyoxyethylene ether and a cross-linked azo.
2. The admixture special for wet-mixed mortar of claim 1, wherein the preparation method of the composite phase-change water-retention thickener comprises the following steps:
(1) Preparing a nano marine polysaccharide molecule: adding macromolecular marine polysaccharide into deionized water, then adding hydrogen peroxide into the solution of the marine polysaccharide to obtain a mixed solution, heating the mixed solution to 50-60 ℃ through a water bath, and mechanically stirring for 4-8 h; separating out, precipitating, centrifuging and purifying to obtain micromolecular marine polysaccharide; dissolving the micromolecular marine polysaccharide powder in deionized water to obtain a marine polysaccharide solution with the mass fraction of 10% -60%, standing for 30-60 h at the temperature of 20 +/-5 ℃, and self-assembling marine polysaccharide molecules with a nano structure;
(2) Preparing a phase change microcapsule: an interface synthesis method is adopted, phase-change paraffin is taken as a core material, and toluene-2, 4-diisocyanate and ethylene glycol are taken as reaction monomers, so that phase-change microcapsules are obtained;
(3) Respectively pretreating the nano marine polysaccharide molecules, the phase change microcapsules and the fatty alcohol-polyoxyethylene ether by using an unsaturated silane coupling agent, and then adding K 2 S 2 O 3 The composite phase-change water-retaining thickener is obtained by emulsion polymerization.
3. The special additive for the wet-mixed mortar of claim 2, wherein in the step (1) of the preparation method of the composite phase-change water-retention thickener, the unsaturated silane coupling agent is vinyl trimethoxy silane.
4. The admixture special for wet-mixed mortar of claim 1, wherein the phase change temperature of the phase change microcapsule is 25.0 ℃, the phase change latent heat is 141.51J/g, the particle size is 0.5-1.0mm, and the encapsulation efficiency is 70-75%.
5. The special admixture for wet-mixed mortar of claim 1, wherein the fatty alcohol polyoxyethylene etherThe alkylen ether has the formula RO (CH) 2 CH 2 O) n H, R is saturated or unsaturated C 12 ～C 18 The hydrocarbon group of (2) is a straight-chain hydrocarbon group or a branched-chain hydrocarbon group, and the weight-average molecular weight is 320-450.
6. The admixture special for the wet-mixed mortar of claim 1, wherein the air entraining agent is at least one or a combination of several of sodium fatty alcohol sulfonate, triterpenoid saponin and sodium dodecyl benzene sulfonate.
7. The special additive for the wet-mixed mortar of claim 1, wherein the retarder is formed by compounding sodium gluconate and 2-phosphate-1, 2, 4-butane tricarboxylate according to a mass ratio of 2.
8. The admixture special for wet-mixed mortar of claim 1, wherein the foam stabilizer is alkylolamide.
9. The special admixture for wet-mixed mortar of claim 1, wherein the admixture amount is 2.5-5% of the mass of the cementing material.
10. Use of the admixture specifically for wet-mixed mortar of any one of claims 1 to 9 as an admixture specifically for wet-mixed mortar.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106498559A (en) * | 2016-09-23 | 2017-03-15 | 青岛大学 | A kind of method that use small-molecular-weight sodium alginate is self-assembled into nanofiber |
| CN112811850A (en) * | 2021-01-15 | 2021-05-18 | 湖南振兴建材科技有限公司 | High-adaptability wet-mixed mortar additive and manufacturing process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498559A (en) * | 2016-09-23 | 2017-03-15 | 青岛大学 | A kind of method that use small-molecular-weight sodium alginate is self-assembled into nanofiber |
| CN112811850A (en) * | 2021-01-15 | 2021-05-18 | 湖南振兴建材科技有限公司 | High-adaptability wet-mixed mortar additive and manufacturing process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 赵云龙等: "石膏应用技术问答", vol. 1, 中国建材工业出版社, pages: 226 - 163 * |
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