CN116375399A - Dry-mixed thin-layer anti-cracking plastering mortar and preparation method thereof - Google Patents
Dry-mixed thin-layer anti-cracking plastering mortar and preparation method thereof Download PDFInfo
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- CN116375399A CN116375399A CN202310291043.9A CN202310291043A CN116375399A CN 116375399 A CN116375399 A CN 116375399A CN 202310291043 A CN202310291043 A CN 202310291043A CN 116375399 A CN116375399 A CN 116375399A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 76
- 238000005336 cracking Methods 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- -1 polypropylene Polymers 0.000 claims abstract description 71
- 239000000835 fiber Substances 0.000 claims abstract description 60
- 239000004743 Polypropylene Substances 0.000 claims abstract description 54
- 229920001155 polypropylene Polymers 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 26
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 19
- 239000004571 lime Substances 0.000 claims abstract description 19
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 19
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 19
- 239000004575 stone Substances 0.000 claims abstract description 19
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 17
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 17
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920000858 Cyclodextrin Polymers 0.000 claims abstract description 9
- 125000000542 sulfonic acid group Chemical group 0.000 claims abstract description 8
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 claims abstract description 7
- 239000001116 FEMA 4028 Substances 0.000 claims abstract description 6
- 235000011175 beta-cyclodextrine Nutrition 0.000 claims abstract description 6
- 229960004853 betadex Drugs 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 18
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical class O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000013067 intermediate product Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 8
- SNKZJIOFVMKAOJ-UHFFFAOYSA-N 3-Amino-1-propanesulfonic acid Natural products NCCCS(O)(=O)=O SNKZJIOFVMKAOJ-UHFFFAOYSA-N 0.000 claims description 7
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 7
- LZXHHNKULPHARO-UHFFFAOYSA-M (3,4-dichlorophenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].C1=C(Cl)C(Cl)=CC=C1C[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 LZXHHNKULPHARO-UHFFFAOYSA-M 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- JOXIMZWYDAKGHI-UHFFFAOYSA-N p-toluenesulfonic acid Substances CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 239000011343 solid material Substances 0.000 claims description 4
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000007792 addition Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 125000005489 p-toluenesulfonic acid group Chemical group 0.000 claims description 2
- 230000008961 swelling Effects 0.000 claims description 2
- 239000000654 additive Substances 0.000 abstract description 5
- 230000000996 additive effect Effects 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- 239000011083 cement mortar Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- 230000036571 hydration Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000012086 standard solution Substances 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 5
- 125000003700 epoxy group Chemical group 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000007142 ring opening reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- YLLIGHVCTUPGEH-UHFFFAOYSA-M potassium;ethanol;hydroxide Chemical compound [OH-].[K+].CCO YLLIGHVCTUPGEH-UHFFFAOYSA-M 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- AKPUJVVHYUHGKY-UHFFFAOYSA-N hydron;propan-2-ol;chloride Chemical compound Cl.CC(C)O AKPUJVVHYUHGKY-UHFFFAOYSA-N 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- HPOKESDSMZRZLC-UHFFFAOYSA-N propan-2-one;hydrochloride Chemical compound Cl.CC(C)=O HPOKESDSMZRZLC-UHFFFAOYSA-N 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- DZGCGKFAPXFTNM-UHFFFAOYSA-N ethanol;hydron;chloride Chemical compound Cl.CCO DZGCGKFAPXFTNM-UHFFFAOYSA-N 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building materials and discloses dry-mixed thin-layer anti-cracking plastering mortar and a preparation method thereof, wherein the dry-mixed thin-layer anti-cracking plastering mortar mainly comprises cement, sand, stone powder, modified polypropylene fibers, fly ash, a polycarboxylate water reducer, an anti-cracking additive, ethylene-vinyl acetate copolymer powder, lime and cellulose ether, wherein the modified polypropylene fibers are prepared by introducing maleic anhydride into a polypropylene fiber structure and then connecting sulfonic acid groups; the cracking-preventing auxiliary agent is prepared by chemically connecting beta-cyclodextrin and hydroxyl-terminated polydimethylsiloxane, and by utilizing the advantages of the modified polypropylene fiber and the cracking-preventing auxiliary agent, the toughness of the plastering mortar can be enhanced, and the cracking resistance of the cement plastering mortar can be synergistically enhanced from different angles.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to dry-mixed thin-layer anti-cracking plastering mortar and a preparation method thereof.
Background
Plastering mortar is a generic name of mortar which is painted on a building base surface to level or provide protection, and can be divided into on-site stirring mortar and premixed dry-mixed mortar, wherein the premixed dry-mixed mortar is a material prepared by mixing aggregate, cementing material and additive in proportion, and can be directly used after being added with water and stirred, and the plastering mortar has the characteristics of convenience in transportation, high construction efficiency, capability of meeting different functional requirements and the like, so that the plastering mortar is very widely used. Along with the continuous acceleration of the urban process, the demand of the basic unit and the high-rise building for the plastering mortar is gradually increased, but the early hydration rate of the cement-based plastering mortar is faster, a large number of small molecular bubbles are difficult to timely discharge, the inside of the mortar is easy to generate serious shrinkage phenomenon after the later moisture is completely volatilized, the uneven hydration process is easy to cause hollowing and microcrack phenomena, and in addition, a large number of pores in the plastering mortar matrix are easy to generate cracks, so that the appearance is unfavorable.
In order to solve the problem that the plastering mortar is easy to crack after construction, in specific application, an additive is often added into the mortar, and Chinese patent application No. CN202010197679.3 discloses green and environment-friendly plastering dry-mixed mortar and a preparation method thereof. However, the dispersibility of the fibers in the mortar matrix is not satisfactory, and the fibers are easily aggregated, so that it is difficult to effectively transfer stress, and the fibers become weak points in the mortar matrix, resulting in a countervailing effect.
Based on the dry-mixed thin-layer plastering mortar with excellent comprehensive performance is prepared by using other materials such as modified polypropylene fibers, cracking-resistant auxiliary agents and the like as additives, and the plastering mortar is simple in preparation method, convenient to use and easy to construct.
Disclosure of Invention
The invention aims to provide dry-mixed thin-layer anti-cracking plastering mortar and a preparation method thereof, wherein functional sulfonic acid groups are introduced into a polypropylene fiber structure, so that the functional sulfonic acid groups can be uniformly dispersed in a mortar matrix, and meanwhile, cyclodextrin-polydimethylsiloxane composite anti-cracking auxiliary agent is prepared to cooperatively enhance the comprehensive performance of the plastering mortar.
The aim of the invention can be achieved by the following technical scheme:
a dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 110-150 parts of cement, 550-700 parts of sand, 20-30 parts of stone powder, 0.5-1 part of modified polypropylene fiber, 35-40 parts of fly ash, 0.25-0.6 part of polycarboxylate water reducer, 2-6 parts of cracking prevention auxiliary agent, 2.5-4 parts of ethylene-vinyl acetate copolymer powder, 10-15 parts of lime and 5-8 parts of cellulose ether;
the modified polypropylene fiber is prepared by introducing maleic anhydride into a polypropylene fiber structure and then connecting sulfonic acid groups;
the cracking-preventing auxiliary agent is prepared by connecting beta-cyclodextrin with hydroxyl-terminated polydimethylsiloxane.
Further, the preparation method of the modified polypropylene fiber comprises the following steps:
s1: mixing polypropylene fiber with pure water, stirring, adding maleic anhydride and ammonium persulfate, introducing nitrogen for protection, placing the system at 80-85deg.C, maintaining the temperature for 2-4 hr, discharging, filtering, washing with water for 2-3 times, and vacuum drying to obtain intermediate product;
s2: swelling the intermediate product in dimethylbenzene, adding 3-amino-1-propane sulfonic acid and a catalyst, uniformly mixing, introducing nitrogen for protection, raising the temperature of the system to 90-100 ℃, preserving heat for 4-8 hours, evaporating the solvent, discharging, washing the solid material by using ethanol, drying in vacuum, and uniformly cutting the obtained fiber to obtain the modified polypropylene fiber.
Further, in the step S1, the dosage ratio of the polypropylene fiber, the maleic anhydride and the ammonium persulfate is 10:4-5:0.1-0.3.
Further, in the step S2, the catalyst is p-toluenesulfonic acid, and the addition amount is 2% -5% of the total amount of the intermediate product and the 3-amino-1-propanesulfonic acid.
Further, in step S2, the length of the uniform cut is 6-9mm.
According to the technical scheme, the maleic anhydride group is introduced into the polypropylene fiber structure by using the water dissimilar grafting method, and can be subjected to ring-opening condensation reaction with amino in the 3-amino-1-propane sulfonic acid structure under the catalysis of p-toluenesulfonic acid due to the high reactivity of the maleic anhydride group, so that the sulfonic acid group is introduced into the polypropylene fiber structure, and the modified polypropylene fiber is prepared.
Further, the preparation method of the cracking-preventing auxiliary agent comprises the following steps:
SS1: pouring beta-cyclodextrin into pure water, mixing uniformly, adding epichlorohydrin and sodium hydroxide solution, stirring for 2-6h at 50-55 ℃, discharging, washing until the material is neutral, and drying in vacuum to obtain modified cyclodextrin;
SS2: mixing the modified cyclodextrin with pure water, adding tetrahydrofuran solution of hydroxyl-terminated polydimethylsiloxane, uniformly mixing, dripping triethylamine, stirring for 2-4h at the temperature of 40-45 ℃, discharging, washing, and vacuum drying to obtain the cracking-preventing auxiliary agent.
Further, in step SS1, the concentration of the sodium hydroxide solution was 0.1mol/L.
Further, in step SS2, the hydroxyl-terminated polydimethylsiloxane has a molecular weight of 500 to 1000.
Further, in the step SS2, the dosage of the triethylamine is 6-10% of the total dosage of the modified cyclodextrin and the hydroxyl-terminated polydimethylsiloxane.
Through the technical scheme, the hydroxyl in the beta-cyclodextrin structure can be subjected to ring opening reaction with epoxy chloropropane, under the action of sodium hydroxide, the hydroxyl generated by the ring opening reaction and halogen chlorine atoms can be subjected to nucleophilic substitution reaction to form epoxy groups, so that the epoxy groups are modified in the cyclodextrin structure to prepare modified cyclodextrin, and under the catalysis of triethylamine, the epoxy groups in the modified cyclodextrin structure can be subjected to ring opening addition reaction with hydroxyl-terminated polydimethylsiloxane to prepare the silane modified cyclodextrin cracking-preventing auxiliary agent.
A preparation method of dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, modified polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
The invention has the beneficial effects that:
(1) According to the invention, a chemical grafting method is utilized to introduce a sulfonic acid hydrophilic group into the polypropylene fiber, the sulfonic acid group can participate in the hydration process of the cement mortar, so that cement particles are loaded on the surface of the polypropylene fiber in situ, the interface performance of the polypropylene fiber and the cement mortar is greatly improved, the polypropylene fiber is promoted to be uniformly dispersed in a cement mortar matrix, the excellent performance of the polypropylene fiber is effectively utilized, and the maleic anhydride group in the modified polypropylene fiber structure and other components in the mortar generate good compatibility, so that other components are tightly connected on the surface of the polypropylene fiber, the deformability of the cement mortar matrix is improved, the toughness of the cement mortar matrix is improved, and the microcrack of the matrix is prevented. In addition, the hydrophilic sulfonic acid group can absorb a large amount of water, and can synergistically enhance the water retention performance of the cement mortar with cellulose ether, so that the problem of crack generation caused by too high hydration rate of the cement mortar is avoided.
(2) The cyclodextrin-polydimethylsiloxane silane compound prepared by the method is used as an anti-cracking additive, and cellulose ether can form a solution with higher viscosity in the mortar coagulation process, so that good adhesion effect can be generated on polydimethylsiloxane, cyclodextrin, cement and sand to form a three-dimensional gel system, and meanwhile, the polydimethylsiloxane has higher fluidity and can fill pores, so that the pore content in a cement mortar matrix is reduced. The cavity structure of the cyclodextrin can lock a large amount of water in the hydration process of the cement mortar, plays a role in anchoring the water, delays the hydration process of the cement, and in the later stage of cement coagulation, the water in the cavity structure of the cyclodextrin is forced to gradually and slowly release by larger pressure, so that the continuous hydration effect is achieved, the capillary pressure of a cement mortar matrix is further reduced, the internal stress is reduced, and the larger shrinkage phenomenon generated after the cement mortar is coagulated is reduced. Therefore, by utilizing the advantages of the modified polypropylene fiber and the cracking-resistant auxiliary agent, the cracking resistance of the cement plastering mortar can be synergistically enhanced from different angles.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Detailed Description
The following examples will clearly and fully describe the technical aspects of the present invention, and it is apparent that the described examples are only some, but not all, examples of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 110 parts of cement, 550 parts of sand, 20 parts of stone powder, 0.5 part of modified polypropylene fiber, 35 parts of fly ash, 0.25 part of polycarboxylate water reducer, 2 parts of cracking prevention auxiliary agent, 2.5 parts of ethylene-vinyl acetate copolymer powder, 10 parts of lime and 5 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, modified polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
The preparation method of the modified polypropylene fiber comprises the following steps:
s1: mixing 2g of polypropylene fiber with pure water, stirring uniformly, adding 1g of maleic anhydride and 0.05g of ammonium persulfate, introducing nitrogen for protection, placing the system at a temperature of 85 ℃ for heat preservation for 3 hours, discharging, filtering, washing with water for 3 times, and vacuum drying to obtain an intermediate product; 1g of intermediate product was weighed, fully swelled in 80mL of xylene, and brought into solutionAdding 50mL of potassium hydroxide-ethanol standard solution with the concentration of 0.1mol/L, heating and refluxing for 6h, cooling the solution, dropwise adding 0.1mL of phenolphthalein indicator into the solution, titrating with hydrochloric acid-isopropanol standard solution with the concentration of 0.1mol/L, stopping titrating when the solution changes color, and recording the volume V of the consumed hydrochloric acid-ethanol standard solution 1 And simultaneously, performing a blank experiment, and calculating the mass fraction of maleic anhydride groups in the intermediate product by using the following formula:
wherein C is the concentration of a potassium hydroxide-ethanol standard solution, mo L/L; v is the volume of the potassium hydroxide-ethanol standard solution, mL; c (C) 1 To titrate the volume of hydrochloric acid-isopropanol standard solution consumed by the intermediate, mL; m is the amount of the intermediate product, and the mass fraction X of the maleic anhydride groups in the intermediate product is 1.5% by calculation.
S2: 1g of the intermediate product is put into dimethylbenzene to be swelled, 2.4g of 3-amino-1-propane sulfonic acid and 0.1g of p-toluenesulfonic acid are added to be mixed evenly, nitrogen is introduced to protect, the temperature of the system is increased to 100 ℃, the temperature is kept for 6 hours, the solvent is evaporated, the solid material is discharged, ethanol is used for washing the solid material, the obtained fiber is uniformly cut into modified polypropylene fiber with the length of 8mm, the mass fraction of maleic anhydride groups in the modified polypropylene fiber structure is tested by using the same method as in the step S1, and the X is 0.4 percent by testing, because the maleic anhydride groups in the intermediate product react with the 3-amino-1-propane sulfonic acid, so that the maleic anhydride groups are partially consumed.
The preparation method of the cracking-preventing auxiliary agent comprises the following steps:
SS1: pouring 5g of beta-cyclodextrin into pure water, uniformly mixing, adding 6.5g of epichlorohydrin and 20mL of sodium hydroxide solution with the concentration of 0.1mol/L, stirring for 3 hours at the temperature of 50 ℃, discharging, washing until the material is neutral, and drying in vacuum to obtain modified cyclodextrin; the epoxy value of the modified cyclodextrin is tested by adopting a hydrochloric acid-acetone method, and the epoxy value of the modified cyclodextrin is 1.326 mmo/g through the test.
SS2: mixing 1g of modified cyclodextrin with pure water, adding 1.5g of tetrahydrofuran solution of hydroxyl-terminated polydimethylsiloxane, uniformly mixing, dripping 0.2mL of triethylamine, stirring for 3 hours at the temperature of 40 ℃, discharging, washing, and vacuum drying to obtain the anti-cracking auxiliary agent, wherein the molecular weight of the hydroxyl-terminated polydimethylsiloxane is 500, and the epoxy value of the anti-cracking auxiliary agent is tested by adopting a hydrochloric acid-acetone method, and the test result shows that the epoxy value of the anti-cracking auxiliary agent is 0.417 mmo/g because the epoxy group of the modified cyclodextrin and the hydroxyl group of the hydroxyl-terminated polydimethylsiloxane are subjected to ring opening, so that the epoxy group is consumed, and the epoxy ester is reduced.
Example 2
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 130 parts of cement, 600 parts of sand, 25 parts of stone powder, 0.8 part of modified polypropylene fiber, 38 parts of fly ash, 0.4 part of polycarboxylate water reducer, 3 parts of cracking prevention auxiliary agent, 3 parts of ethylene-vinyl acetate copolymer powder, 12 parts of lime and 6 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, modified polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
Example 3
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 150 parts of cement, 700 parts of sand, 30 parts of stone powder, 1 part of modified polypropylene fiber, 40 parts of fly ash, 0.6 part of polycarboxylate water reducer, 6 parts of cracking prevention auxiliary agent, 4 parts of ethylene-vinyl acetate copolymer powder, 15 parts of lime and 8 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, modified polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
Comparative example 1
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 130 parts of cement, 600 parts of sand, 25 parts of stone powder, 0.8 part of polypropylene fiber, 38 parts of fly ash, 0.4 part of polycarboxylate water reducer, 3 parts of cracking prevention auxiliary agent, 3 parts of ethylene-vinyl acetate copolymer powder, 12 parts of lime and 6 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
Wherein the preparation method of the cracking prevention auxiliary agent is the same as that of the example 1.
Comparative example 2
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 130 parts of cement, 600 parts of sand, 25 parts of stone powder, 38 parts of fly ash, 0.4 part of polycarboxylate water reducer, 3 parts of cracking-preventing auxiliary agent, 3 parts of ethylene-vinyl acetate copolymer powder, 12 parts of lime and 6 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain a premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
Wherein the preparation method of the cracking prevention auxiliary agent is the same as that of the example 1.
Comparative example 3
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 130 parts of cement, 600 parts of sand, 25 parts of stone powder, 0.8 part of modified polypropylene fiber, 38 parts of fly ash, 0.4 part of polycarboxylate water reducer, 3 parts of ethylene-vinyl acetate copolymer powder, 12 parts of lime and 6 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, modified polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
Wherein the modified polypropylene fiber was prepared in the same manner as in example 1.
Comparative example 4
A dry-mixed thin-layer anti-cracking plastering mortar comprises the following raw materials in parts by weight: 130 parts of cement, 600 parts of sand, 25 parts of stone powder, 38 parts of fly ash, 0.4 part of polycarboxylate water reducer, 3 parts of ethylene-vinyl acetate copolymer powder, 12 parts of lime and 6 parts of cellulose ether;
the preparation method of the dry-mixed thin-layer anti-cracking plastering mortar comprises the following steps:
step one: cement, sand, stone powder, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain a premix;
step two: and (3) adding the polycarboxylate water reducer and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
Performance detection
The cracking indexes of plastering mortars prepared in examples 1 to 3 and comparative examples 1 to 3 of the present invention were tested with reference to national standard JC/T951-2005 Experimental method for crack resistance of Cement mortars; the tensile bond strength, compressive strength, water retention and shrinkage of the plastering mortars prepared in examples 1 to 3 and comparative examples 1 to 3 of the present invention were tested with reference to the national standard JGJ/T70-2009 "basic performance test method standard for construction mortars", and the test results are shown in the following table:
as can be seen from the above table, in the embodiments 1-3, the modified polypropylene fibers and the anti-cracking auxiliary agent are used for filling modification of the mortar, and the synergistic effect of the modified polypropylene fibers and the anti-cracking auxiliary agent is utilized, so that the prepared plastering mortar has the advantages of low cracking index, high toughness, low porosity, small shrinkage and excellent water retention property. The plastering mortar prepared in comparative example 1 adopts unmodified polypropylene fibers for filling modification, and probably because the polypropylene fibers are agglomerated, the plastering mortar cannot be practically cooperated with an anti-cracking auxiliary agent, and has good toughening and anti-cracking effects, so that various indexes are poor in performance. The plastering mortar prepared in comparative example 2 was not added with polypropylene fibers, and was subjected to filling modification only with an anti-cracking aid, but the toughness and water retention were poor although the cracking index and shrinkage were still satisfactory. The plastering mortar prepared in the comparative example 3 only adopts unmodified polypropylene fibers for filling modification, which not only causes agglomeration, but also cannot utilize anti-cracking auxiliary agents to fill pores, and although toughness performance is still good, other indexes are all at lower level. The plastering mortar prepared in comparative example 4 was not modified with a modifier, so that each index exhibited extremely poor performance.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (10)
1. The dry-mixed thin-layer anti-cracking plastering mortar is characterized by comprising the following raw materials in parts by weight: 110-150 parts of cement, 550-700 parts of sand, 20-30 parts of stone powder, 0.5-1 part of modified polypropylene fiber, 35-40 parts of fly ash, 0.25-0.6 part of polycarboxylate water reducer, 2-6 parts of cracking prevention auxiliary agent, 2.5-4 parts of ethylene-vinyl acetate copolymer powder, 10-15 parts of lime and 5-8 parts of cellulose ether;
the modified polypropylene fiber is prepared by introducing maleic anhydride into a polypropylene fiber structure and then connecting sulfonic acid groups;
the cracking-preventing auxiliary agent is prepared by connecting beta-cyclodextrin with hydroxyl-terminated polydimethylsiloxane.
2. The dry-mixed thin-layer anti-cracking plastering mortar according to claim 1, wherein the preparation method of the modified polypropylene fiber comprises the following steps:
s1: mixing polypropylene fiber with pure water, stirring, adding maleic anhydride and ammonium persulfate, introducing nitrogen for protection, placing the system at 80-85deg.C, maintaining the temperature for 2-4 hr, discharging, filtering, washing with water for 2-3 times, and vacuum drying to obtain intermediate product;
s2: swelling the intermediate product in dimethylbenzene, adding 3-amino-1-propane sulfonic acid and a catalyst, uniformly mixing, introducing nitrogen for protection, raising the temperature of the system to 90-100 ℃, preserving heat for 4-8 hours, evaporating the solvent, discharging, washing the solid material by using ethanol, drying in vacuum, and uniformly cutting the obtained fiber to obtain the modified polypropylene fiber.
3. The dry-mixed thin-layer anti-cracking plastering mortar according to claim 2, wherein in step S1, the dosage ratio of the polypropylene fiber, the maleic anhydride and the ammonium persulfate is 10:4-5:0.1-0.3.
4. The dry-mixed thin-layer anti-cracking plastering mortar according to claim 2, wherein in step S2, the catalyst is p-toluenesulfonic acid, and the addition amount is 2% -5% of the total amount of the intermediate product and 3-amino-1-propanesulfonic acid.
5. A dry-mixed thin-layer anti-crack plastering mortar according to claim 2, wherein in step S2, the length of the uniform cut is 6-9mm.
6. The dry-mixed thin-layer anti-cracking plastering mortar according to claim 1, wherein the preparation method of the anti-cracking auxiliary agent comprises the following steps:
SS1: pouring beta-cyclodextrin into pure water, mixing uniformly, adding epichlorohydrin and sodium hydroxide solution, stirring for 2-6h at 50-55 ℃, discharging, washing until the material is neutral, and drying in vacuum to obtain modified cyclodextrin;
SS2: mixing the modified cyclodextrin with pure water, adding tetrahydrofuran solution of hydroxyl-terminated polydimethylsiloxane, uniformly mixing, dripping triethylamine, stirring for 2-4h at the temperature of 40-45 ℃, discharging, washing, and vacuum drying to obtain the cracking-preventing auxiliary agent.
7. A dry-mixed thin-layer anti-crack plastering mortar according to claim 6, wherein in step SS1, the concentration of sodium hydroxide solution is 0.1mol/L.
8. A dry-mixed thin-layer anti-crack plastering mortar according to claim 6, wherein in step SS2, the molecular weight of the hydroxyl-terminated polydimethylsiloxane is 500-1000.
9. The dry-mixed thin-layer anti-cracking plastering mortar according to claim 6, wherein in step SS2, the amount of triethylamine is 6% -10% of the total amount of modified cyclodextrin and hydroxyl-terminated polydimethylsiloxane.
10. A method for preparing the dry-mixed thin-layer anti-cracking plastering mortar according to claim 1, comprising the following steps:
step one: cement, sand, stone powder, modified polypropylene fiber, fly ash, lime and cellulose ether in parts by weight are poured into a mixer to be uniformly mixed, so as to obtain premix;
step two: and (3) adding the polycarboxylate water reducer, the cracking-preventing auxiliary agent and the ethylene-vinyl acetate copolymer powder in parts by weight into the premix, and stirring uniformly to obtain the dry-mixed thin-layer anti-cracking plastering mortar.
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| CN116948467A (en) * | 2023-07-21 | 2023-10-27 | 阁美仕(广东)建材有限公司 | Fireproof damping floor sound insulation coating and preparation method thereof |
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