CN110922138A - Machine-sprayed polymer anti-crack plastering mortar - Google Patents
Machine-sprayed polymer anti-crack plastering mortar Download PDFInfo
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- CN110922138A CN110922138A CN201911302990.3A CN201911302990A CN110922138A CN 110922138 A CN110922138 A CN 110922138A CN 201911302990 A CN201911302990 A CN 201911302990A CN 110922138 A CN110922138 A CN 110922138A
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- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
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- 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
Abstract
The invention relates to a machine-sprayed polymer anti-cracking plastering mortar which comprises, by weight, 10-12 parts of cement, 11-14 parts of fly ash, 0.015-0.15 part of fiber, 2.02-4.04 parts of thixotropic agent, 2-3 parts of redispersible polymer latex powder, 0.5-1.5 parts of accelerator, 0.015-0.025 part of cellulose ether, 0.01-0.03 part of water reducer and 60-70 parts of sand. The adhesive has good thixotropy, ensures the state of machine spraying construction, has excellent wet bonding strength, and ensures that the adhesive has good anti-sliding and anti-hanging effects after being applied to a wall; and has excellent flexibility and crack resistance, so that the generated brittle shrinkage stress does not easily influence the adhesive force.
Description
Technical Field
The invention relates to the technical field of wall repairing engineering, in particular to a machine-sprayed polymer anti-crack plastering mortar.
Background
The plastering mortar is also called as plastering mortar, and is mortar which is smeared on the surfaces of buildings and members and the surface of a base material, protects a base layer and meets the use requirement. The plastering mortar is mainly used for an anti-cracking protection layer of a heat insulation outer layer in a benzene thin plastering heat insulation system, and the plastering mortar is firmly combined with a base surface, so that the mortar is required to have good bonding force and anti-cracking capability.
The plastering mortar is an extremely important link in wall repairing engineering, particularly ancient building walls which are mostly long and have large area and no shrinkage joints. Under the condition of ancient method new making, the whole repairing system comprises interface mortar, repair mortar, plastering and leveling mortar and anti-cracking mortar, and particularly the plastering and leveling mortar has excellent cracking resistance, excellent adhesion and good weather resistance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the machine-sprayed polymer anti-cracking plastering mortar which has good thixotropy, ensures the state of machine-sprayed construction, has excellent wet bonding strength and ensures that the mortar has good anti-sliding and hanging effects after being put on a wall; and has excellent flexibility and crack resistance, so that the generated brittle shrinkage stress does not easily influence the adhesive force.
The technical purpose of the invention is realized by the following technical scheme:
the machine-sprayed polymer anti-cracking plastering mortar comprises, by weight, 10-12 parts of cement, 11-14 parts of fly ash, 0.015-0.15 part of fiber, 2.02-4.04 parts of thixotropic agent, 2-3 parts of redispersible polymer latex powder, 0.5-1.5 parts of accelerating agent, 0.015-0.025 part of cellulose ether, 0.01-0.03 part of water reducing agent and 60-70 parts of sand.
Further, the cement is selected from PO42.5 portland cement.
Further, the fly ash is selected from class II fly ash.
Further, the fiber is a mixture of polypropylene fiber and polyacrylonitrile fiber, and the weight ratio of the polypropylene fiber to the polyacrylonitrile fiber is 1: 0.2-0.5.
Further, the thixotropic agent is a mixture of hydroxypropyl starch ether and magnesium aluminum silicate, and the weight ratio of the hydroxypropyl starch ether to the magnesium aluminum silicate is (0.02-0.04): 2-4.
Further, the redispersible polymer latex powder is prepared by adopting the following method:
dissolving the end-mercapto polyvinyl alcohol in water at 90-93 ℃, adding methyl methacrylate and sodium bicarbonate into the end-mercapto polyvinyl alcohol aqueous solution at 78-82 ℃, uniformly mixing, adding an initiator aqueous solution with the weight percentage concentration of 1%, and carrying out heat preservation reaction for 1 hour; maintaining the reaction temperature of 78-82 ℃, simultaneously dropwise adding a mixed monomer of methyl methacrylate, triisopropoxysilylpropyl methacrylate, 4,4, 4-trifluoro-2-butenol and phosphoenolpyruvic acid and an initiator aqueous solution with the weight percentage concentration of 1%, controlling the dropwise adding time of the mixed monomer to be 5 hours, and controlling the dropwise adding time of the initiator aqueous solution with the weight percentage concentration of 1% to be 6 hours; after the mixed monomers are added successively, keeping the temperature and reacting for 1 hour to obtain polymer emulsion; 5-8 parts of mercapto-terminated polyvinyl alcohol, 140 parts of water 130-one, 8-10 parts of methyl methacrylate, 1-2 parts of sodium bicarbonate, 15-20 parts of the initial addition amount of 1% by weight of initiator aqueous solution, 50-55 parts of methyl methacrylate, 55-60 parts of triisopropoxypropyl methacrylate propyl ester, 15-20 parts of 4,4, 4-trifluoro-2-butenol, 10-15 parts of phosphoenolpyruvic acid and 50-60 parts of 1% by weight of the secondary addition amount of 1% by weight of initiator aqueous solution;
the weight ratio of the components is 1: 0.2-0.25 of polymer emulsion and 10 percent of aqueous solution of the polyvinyl alcohol by weight percentage concentration, adopting a pH regulator to adjust the pH value of the mixture to 8.5, and obtaining the redispersible polymer latex powder by spray drying.
Still further, the initiator is selected from ammonium persulfate.
Still further, the pH adjuster is selected from an aqueous solution of sodium hydroxide having a concentration of 5% by weight.
Further, the water reducing agent is selected from polycarboxylate water reducing agent powder.
Further, the sand is selected from sand in zone II.
In conclusion, the invention has the following beneficial effects:
firstly, the machine-sprayed polymer anti-cracking plastering mortar provided by the invention has good thixotropy, ensures the state of machine-sprayed construction, has excellent wet bonding strength, and ensures that the mortar has good anti-sliding and anti-hanging effects after being put on a wall; and has excellent flexibility and crack resistance, so that the generated brittle shrinkage stress does not easily influence the adhesive force.
Secondly, the redispersible polymer latex powder provided by the invention is replaced by the latex powder in the prior art, and various performances of the machine-sprayed polymer anti-crack plastering mortar provided by the invention are reduced, which shows that the latex powder in the prior art cannot be compatible with other raw materials in the machine-sprayed polymer anti-crack plastering mortar provided by the invention. And the thixotropic agent consisting of hydroxypropyl starch ether and magnesium aluminum silicate slightly affects various performances of the machine-sprayed polymer anti-cracking plastering mortar provided by the invention, and the hydroxypropyl starch ether and the magnesium aluminum silicate can synergistically improve various performances of the machine-sprayed polymer anti-cracking plastering mortar provided by the invention.
Thirdly, the thixotropic agent consisting of hydroxypropyl starch ether and magnesium aluminum silicate can ensure the thixotropic performance of the machine-sprayed polymer anti-cracking plastering mortar, namely the state of machine-sprayed construction is ensured, and the hydroxypropyl starch ether and the magnesium aluminum silicate are indispensable. In addition, the thixotropic agent consisting of hydroxypropyl starch ether and magnesium aluminum silicate is matched with the redispersible polymer latex powder, so that the machine-sprayed polymer anti-cracking plastering mortar has excellent wet bonding strength, namely, the good anti-slipping and anti-sagging effect after being put on a wall is ensured.
Fourthly, when the polypropylene fiber and the polyacrylonitrile fiber are simultaneously added, various performances, especially the crack resistance, of the machine-sprayed polymer crack-resistant plastering mortar provided by the invention can be enhanced.
Drawings
FIG. 1 is a flow chart of the spray-drying process for preparing the redispersible polymer latex powder of the present invention.
Reference numerals: 1. a material storage tank; 2. a filter; 3. a pump; 4. an air distributor; 5. an atomizer; 6. an air heater; 7. a filter; 8. a blower; 9. an induced draft fan; 10; a cyclone separator; 11. a spray dryer.
Detailed Description
The present invention will be described in further detail with reference to examples.
Preparation of thiol-terminated polyvinyl alcohol: under the temperature condition of 0 ℃, the weight ratio of 144: 0.15: mixing 0.51 of vinyl acetate, azodiisobutyronitrile and thioacetic acid, performing nitrogen protection at the temperature of 0 ℃, heating to 60 ℃ under the nitrogen protection to start polymerization reaction, and cooling to 0 ℃ after 1 hour to terminate the reaction to obtain thioacetic acid-based polyvinyl acetate; under the protection of nitrogen, heating thioacetic acid-based polyvinyl acetate in a methanol solution of sodium hydroxide to 60 ℃ for hydrolysis reaction for 48 hours, removing methanol to obtain end-mercapto polyvinyl alcohol, wherein the weight ratio of thioacetic acid-based polyvinyl acetate to sodium hydroxide to methanol is 100: 51: 792. the product thiol-terminated polyvinyl alcohol showed a typical-SH absorption peak by infrared spectroscopic examination.
Preparation example 1 of redispersible Polymer latex powder
Dissolving 6.5Kg of end-mercapto polyvinyl alcohol in 135Kg of water at 90 ℃, adding 9Kg of methyl methacrylate and 1.5Kg of sodium bicarbonate into the end-mercapto polyvinyl alcohol aqueous solution at 80 ℃, uniformly mixing, adding 17.5Kg of ammonium persulfate aqueous solution with the weight percentage concentration of 1%, and carrying out heat preservation reaction for 1 hour; keeping the reaction temperature of 80 ℃, simultaneously dropwise adding 52Kg of methyl methacrylate, 58Kg of triisopropoxysilyl propyl methacrylate, 18Kg of 4,4, 4-trifluoro-2-butenol and 12Kg of phosphoenolpyruvic acid mixed monomer and 55Kg of ammonium persulfate aqueous solution with the weight percentage concentration of 1%, controlling the dropwise adding time of the mixed monomer to be 5 hours, and controlling the dropwise adding time of the ammonium persulfate aqueous solution with the weight percentage concentration of 1% to be 6 hours; after the mixed monomers are added successively, keeping the temperature and reacting for 1 hour to obtain polymer emulsion;
the weight ratio of the components is 1:0.2 of polymer emulsion and 10 percent of aqueous solution of polyvinyl alcohol, adopting 5 percent of aqueous solution of sodium hydroxide to adjust the pH value of the mixture to 8.5, and obtaining the redispersible polymer latex powder by spray drying.
Preparation example 2 of redispersible Polymer latex powder
Dissolving 5Kg of end-mercapto polyvinyl alcohol into 140Kg of water at 92 ℃, adding 10Kg of methyl methacrylate and 1Kg of sodium bicarbonate into the end-mercapto polyvinyl alcohol aqueous solution at 78 ℃, uniformly mixing, adding 20Kg of ammonium persulfate aqueous solution with the weight percentage concentration of 1%, and carrying out heat preservation reaction for 1 hour; maintaining the reaction temperature of 78 ℃, simultaneously dropwise adding 50Kg of methyl methacrylate, 60Kg of triisopropoxysilyl propyl methacrylate, 15Kg of 4,4, 4-trifluoro-2-butenol and 15Kg of phosphoenolpyruvic acid, and 50Kg of ammonium persulfate aqueous solution with the weight percentage concentration of 1%, wherein the dropwise adding time of the mixed monomers is controlled to be 5 hours, and the dropwise adding time of the ammonium persulfate aqueous solution with the weight percentage concentration of 1% is controlled to be 6 hours; after the mixed monomers are added successively, keeping the temperature and reacting for 1 hour to obtain polymer emulsion;
the weight ratio of the components is 1: 0.22 percent of polymer emulsion and 10 percent of aqueous solution of polyethanol, adopting 5 percent of aqueous solution of sodium hydroxide to adjust the pH value of the mixture to 8.5, and obtaining the redispersible polymer latex powder by spray drying.
Preparation example 3 of redispersible Polymer latex powder
Dissolving 8Kg of end-mercapto polyvinyl alcohol into 130Kg of water at 93 ℃, adding 8Kg of methyl methacrylate and 2Kg of sodium bicarbonate into an aqueous solution of the end-mercapto polyvinyl alcohol at 82 ℃, uniformly mixing, adding 15Kg of an aqueous solution of ammonium persulfate with the weight percentage concentration of 1%, and carrying out heat preservation reaction for 1 hour; keeping the reaction temperature of 82 ℃, simultaneously dropwise adding 55Kg of methyl methacrylate, 55Kg of triisopropoxysilyl propyl methacrylate, 20Kg of 4,4, 4-trifluoro-2-butenol and 10Kg of phosphoenolpyruvic acid, and 60Kg of ammonium persulfate aqueous solution with the weight percentage concentration of 1%, wherein the dropwise adding time of the mixed monomers is controlled to be 5 hours, and the dropwise adding time of the ammonium persulfate aqueous solution with the weight percentage concentration of 1% is controlled to be 6 hours; after the mixed monomers are added successively, keeping the temperature and reacting for 1 hour to obtain polymer emulsion;
the weight ratio of the components is 1: 0.25 percent of polymer emulsion and 10 percent of aqueous solution of polyethanol, adjusting the pH value of the mixture to 8.5 by adopting 5 percent of aqueous solution of sodium hydroxide, and obtaining the redispersible polymer latex powder by spray drying.
Referring to fig. 1, the blend of preparation examples 1 to 3 of redispersible polymer latex powder is delivered from a holding tank 1 through a filter 2 by a pump 3 to an atomizer 5 at the top of a spray dryer, and atomized into droplets. Air is sent to the top of the spray dryer through a filter 7, an air heater 6 and an air distributor 4 by a blower 8, contacts and mixes with the fog drops, and carries out heat transfer and mass transfer, namely drying. The dried product is led out from the bottom of the tower. The dust-entrained waste gas is discharged by the induced draft fan 9 through the cyclone separator 10.
Example 1
Machine spraying of polymer anti-crack plastering mortar: 10Kg of PO42.5 Portland cement, 11Kg of class II fly ash, 0.1Kg of 6mm polypropylene fiber, 0.05Kg of 6mm polyacrylonitrile fiber, 0.03Kg of hydroxypropyl starch ether, 3Kg of magnesium aluminum silicate, 2 to 3Kg of redispersible polymer latex powder provided by preparation example 1 of redispersible polymer latex powder, 0.5 to 1.5Kg of accelerating agent, 0.015 to 0.025Kg of cellulose ether, 0.01 to 0.03Kg of polycarboxylic acid water reducing agent powder and 65 to 76Kg of sand in a II area are mixed to prepare the water-based dispersion.
Example 2
Machine spraying of polymer anti-crack plastering mortar: 10-12Kg of PO42.5 Portland cement, 11-14Kg of class II fly ash, 0.0125Kg of 6mm polypropylene fiber, 0.0025Kg of 6mm polyacrylonitrile fiber, 0.04Kg of hydroxypropyl starch ether, 2Kg of magnesium aluminum silicate, 2-3Kg of redispersible polymer latex powder provided by preparation example 1 of redispersible polymer latex powder, 0.5-1.5Kg of accelerating agent, 0.015-0.025Kg of cellulose ether, 0.01-0.03Kg of polycarboxylic acid water reducing agent powder and 65-76Kg of sand in the II area are mixed to prepare the composite.
Example 3
Machine spraying of polymer anti-crack plastering mortar: 10-12Kg of PO42.5 Portland cement, 11-14Kg of class II fly ash, 0.75Kg of 6mm polypropylene fiber, 0.25Kg of 6mm polyacrylonitrile fiber, 0.02Kg of hydroxypropyl starch ether, 4Kg of magnesium aluminum silicate, 2-3Kg of redispersible polymer latex powder provided by preparation example 1 of redispersible polymer latex powder, 0.5-1.5Kg of accelerating agent, 0.015-0.025Kg of cellulose ether, 0.01-0.03Kg of polycarboxylic acid water reducing agent powder and 65-76Kg of sand in a zone II are mixed to prepare the water reducing agent.
Comparative example 1
Patent application publication No. CN109180133A, published as 2019.01.11, discloses a polymer anti-crack dry-mixed plastering mortar and the polymer anti-crack dry-mixed plastering mortar provided in example 1 of the polymer anti-crack dry-mixed plastering mortar are selected as comparative example 1 of the present invention.
Comparative example 1 specifically is: preparation of polymer emulsion: 20Kg of triethylene glycol dimethacrylate monomer, 15Kg of 2,2, 4-trimethylhexamethylene-bis (2-carbamoyloxyethyl) dimethacrylate monomer and 10Kg of propylene-2-hydroxyethyl ester monomer are added into a mixed solution of 0.5Kg of sodium bicarbonate acid buffer, 0.5Kg of potassium sulfate initiator, 1.4Kg of alkyl diphenyl ether disulfonate disodium emulsifier and 100Kg of deionized water for pre-emulsification, the temperature is raised to 85 ℃, the reaction is carried out for 4 hours, adding 15Kg of diacetone acrylamide monomer, uniformly mixing, then dropwise adding a shell layer mixed monomer containing 15Kg of propylene-2-hydroxyethyl monomer, 10Kg of 2-acrylamide-2-methylpropanesulfonic acid monomer and 25Kg of vinyl acetate monomer, and continuously reacting for 4 hours after dropwise adding to obtain the polymer emulsion.
Preparation of polymer latex powder: adopting a sodium hydroxide aqueous solution with the weight percentage concentration of 5 percent to adjust the pH value of the polymer emulsion to 8.0, adding a polyvinyl alcohol aqueous solution with the weight percentage concentration of 5 percent, uniformly stirring, and then carrying out spray drying treatment on the polymer emulsion powder; wherein, the dosage of the polyvinyl alcohol water solution with the weight percentage concentration of 5 percent is 8 percent of the weight of the polymer emulsion.
Preparing the polymer anti-crack dry powder plastering mortar: 50Kg of P.O42.5 Portland cement, 15Kg of CA-50 high-alumina cement, 15Kg of anhydrous anhydrite, 115Kg of II-grade fly ash, 735Kg of sand, 0.13Kg of thickening agent, 1.0Kg of fiber, 25Kg of polymer emulsion powder, 0.15Kg of thixotropic agent, 25Kg of thixotropic lubricant and 1.0Kg of water reducing agent are evenly mixed to obtain the product. Wherein, the sand is 26 by weight: 24: 12: the 11 continuous graded sand with the grain diameter of 3.35-2.36mm, the 2.36-1.18mm continuous graded sand, the 1.18-0.6mm continuous graded sand and the 0.6-0.075mm continuous graded sand.
Comparative example 2
Machine spraying of polymer anti-crack plastering mortar: compared to example 1, the re-dispersible polymer latex powder provided by preparation example 1 of the re-dispersible polymer latex powder was replaced with the polymer latex powder provided by comparative example 1.
Comparative example 3
Machine spraying of polymer anti-crack plastering mortar: compared to example 1, the re-dispersible polymer latex powder provided by preparation example 1 of the re-dispersible polymer latex powder was replaced with a re-dispersible latex powder of DS-7030 type.
Comparative example 4
Machine spraying of polymer anti-crack plastering mortar: compared with the example 1, the thixotropic agent consisting of 0.03Kg of hydroxypropyl starch ether and 3Kg of magnesium aluminum silicate is replaced by the thixotropic agent consisting of 3.03K of hydroxypropyl starch ether.
Comparative example 5
Machine spraying of polymer anti-crack plastering mortar: compared with the example 1, the thixotropic agent consisting of 0.03Kg of hydroxypropyl starch ether and 3Kg of magnesium aluminum silicate is replaced by the thixotropic agent consisting of 3.03K of magnesium aluminum silicate.
Comparative example 6
Machine spraying of polymer anti-crack plastering mortar: compared with the example 1, the fiber composed of 0.1Kg of 6mm polypropylene fiber and 0.05Kg of 6mm polyacrylonitrile fiber is replaced by the fiber composed of 0.15Kg of 6mm polypropylene fiber.
Comparative example 7
Machine spraying of polymer anti-crack plastering mortar: compared with the example 1, the fiber composed of 0.1Kg of 6mm polypropylene fiber and 0.05Kg of 6mm polyacrylonitrile fiber is replaced by the fiber composed of 0.15Kg of 6mm polyacrylonitrile fiber.
Uniformly mixing the machine-sprayed polymer anti-crack plastering mortar provided in examples 1-3 and comparative examples 2-7 and the polymer anti-crack dry-mixed plastering mortar provided in comparative example 1 with water according to the weight ratio of 1:0.2 respectively to obtain plastering mortar slurry, pumping the plastering mortar slurry through a pipe with the length of 100 meters and the inner diameter of 6 centimeters, and observing the bleeding and segregation conditions of the plastering mortar slurry; and vertically spraying the plastering mortar slurry onto the wall by a spraying machine, wherein the spraying thickness is 8 cm, and observing the sagging condition of the coating. The results of the observation are shown in Table 1.
TABLE 1
| Measurement items | Bleeding and segregation | Sagging condition |
| Example 1 | No bleeding and segregation | Without sagging |
| Example 2 | No bleeding and segregation | Without sagging |
| Example 3 | No bleeding and segregation | Without sagging |
| Comparative example 1 | No bleeding and segregation | Without sagging |
| Comparative example 2 | No bleeding and segregation | With a sagging |
| Comparative example 3 | No bleeding and segregation | With a sagging |
| Comparative example 4 | Bleeding and segregation | With a sagging |
| Comparative example 5 | Bleeding and segregation | With a sagging |
| Comparative example 6 | No bleeding and segregation | Without sagging |
| Comparative example 7 | No bleeding and segregation | Without sagging |
As can be seen from Table 1, the machine-sprayed polymer anti-cracking plastering mortar provided by the invention has good thixotropy, ensures the state of machine-sprayed construction, has excellent wet bonding strength, and ensures that the mortar has good anti-sliding and anti-sagging effects after being applied to a wall.
The machine-sprayed polymer anti-crack plastering mortar provided in examples 1 to 3 and the polymer anti-crack dry powder plastering mortar provided in comparative example 1 have no bleeding, segregation and sagging phenomena after observation; on the other hand, the machine-sprayed polymer anti-crack plastering mortar provided by the comparative example 2 has sagging phenomenon although water and segregation phenomena are not generated. This shows that the polymer latex powder of comparative example 1 and comparative example 2 cannot be matched with other raw materials in the machine-sprayed polymer anti-crack plastering mortar provided by the present invention and achieve the purpose of no sagging, i.e. cannot ensure good anti-slip sagging effect after being put on a wall.
The comparison of the experimental results of the example 1 and the comparative examples 4 to 5 shows that the thixotropic agent consisting of hydroxypropyl starch ether and magnesium aluminum silicate can ensure the thixotropic performance of the machine-sprayed polymer anti-cracking plastering mortar provided by the invention, namely the thixotropic state of the machine-sprayed construction is ensured, and the hydroxypropyl starch ether and the magnesium aluminum silicate are not indispensable. In addition, the thixotropic agent consisting of hydroxypropyl starch ether and magnesium aluminum silicate is matched with the redispersible polymer latex powder, so that the machine-sprayed polymer anti-cracking plastering mortar has excellent wet bonding strength, namely, the good anti-slipping and anti-sagging effect after being put on a wall is ensured.
By comparing the experimental results of example 1 and comparative examples 6 to 7, there was no significant difference in the experimental results of example 1 and comparative examples 6 to 7, which demonstrates that the addition of polypropylene fibers and/or polyacrylonitrile fibers does not affect the thixotropy and wet bond strength of the organic spray polymer anti-crack plastering mortar provided by the present invention.
The measurement results of the properties of the machine-sprayed polymer anti-crack plastering mortars provided in examples 1 to 3 and comparative examples 2 to 7 and the polymer anti-crack dry powder plastering mortar provided in comparative example 1 are shown in Table 2. Wherein, the compressive strength is tested according to the relevant regulations of GBT17671-1999 cement mortar strength test method; the linear shrinkage is tested according to the relevant regulations of JGJ/T70-2009 building mortar basic performance test method standard; the transverse deformation capability is tested according to appendix B of JC/T1004-2006 ceramic wall and floor tile joint mixture; the fold-crush ratio is tested according to the performance index of 6 coating mortar in GBT29906-2013 'molded polyphenyl plate thin plastered exterior wall external thermal insulation system material'; the tensile bonding strength is tested according to the relevant regulations of JGJ/T70-2009 building mortar basic performance test method standard, and the curing is carried out according to the relevant regulations of JCT907-2002 concrete interface treating agent; the corrosion effect of the steel bars is tested according to the relevant regulations of JC/T986-2005 Cement-based grouting material.
TABLE 2
As can be seen from Table 2, the results of the measurements of compressive strength show that the machine-sprayed polymer anti-cracking plastering mortar provided by the invention has excellent compressive strength and is not easily damaged by external force.
Through the measurement results of the transverse deformation capacity and the compression-fracture ratio, the machine-sprayed polymer anti-crack plastering mortar provided by the invention has excellent flexibility, so that the brittle shrinkage stress of the machine-sprayed polymer anti-crack plastering mortar is not easy to influence the bonding force.
The results of the tensile bond strength (untreated 14d) and the wet bond strength show that the machine-sprayed polymer anti-crack plastering mortar provided by the invention has excellent adhesion, so that the machine-sprayed polymer anti-crack plastering mortar is not easy to separate from the repaired wall.
The measurement result of the linear shrinkage rate shows that the machine-sprayed polymer anti-crack plastering mortar provided by the invention has extremely low shrinkage rate. Therefore, the machine-sprayed polymer anti-cracking plastering mortar provided by the invention has no cracking, no expansion joint and no bulge.
The determination of tensile bonding strength (soaking treatment, heat treatment and freeze-thaw cycle treatment) can show that the machine-sprayed polymer anti-crack plastering mortar still has good tensile bonding strength after ultimate treatment, and the tensile bonding strength exceeds 0.5MPa and is far greater than the safety requirement of the bonding force of 0.3MPa of the base layer required by plastering construction. Therefore, the durability of the machine-sprayed polymer anti-cracking plastering mortar provided by the invention is good.
By comparing the experimental results of examples 1 to 3 and comparative example 1, the machine-sprayed polymer anti-crack plastering mortar provided in examples 1 to 3 has more excellent compressive strength, linear shrinkage, flexibility and tensile bond strength than the polymer anti-crack dry powder plastering mortar provided in comparative example 1. In addition, compared with the machine-sprayed polymer anti-crack plastering mortar provided by the invention, the material cost for producing the polymer anti-crack dry powder plastering mortar provided by the comparative example 1 is higher.
Through comparison of the experimental results of the embodiment 1 and the comparative examples 2 to 3, it is shown that simply replacing the redispersible polymer latex powder provided by the invention with the polymer latex powder related to the comparative example 2 and the DS-7030 type redispersible latex powder related to the comparative example 3 all performances of the machine-sprayed polymer anti-crack plastering mortar provided by the invention are reduced. This shows that the latex powder in the prior art cannot be compatible with other raw materials in the machine-sprayed anti-crack polymer plastering mortar provided by the invention.
The comparison of the experimental results of the example 1 and the comparative examples 4 to 5 shows that the thixotropic agent consisting of hydroxypropyl starch ether and magnesium aluminum silicate slightly affects the performances of the machine-sprayed polymer anti-crack plastering mortar provided by the invention, and the hydroxypropyl starch ether and the magnesium aluminum silicate can synergistically improve the performances of the machine-sprayed polymer anti-crack plastering mortar provided by the invention.
The comparison of the experimental results of the example 1 and the comparative examples 6 to 57 shows that the mechanical spray polymer anti-crack plastering mortar provided by the invention can enhance various properties, especially the anti-crack property, when the polypropylene fiber and the polyacrylonitrile fiber are simultaneously doped.
It is to be understood that the preparation methods described in the examples are only for illustrating the present invention and are not to be construed as limiting the present invention, and that the simple modifications of the preparation methods of the present invention based on the concept of the present invention are within the scope of the present invention as claimed.
Claims (10)
1. The machine-sprayed polymer anti-cracking plastering mortar is characterized by comprising, by weight, 10-12 parts of cement, 11-14 parts of fly ash, 0.015-0.15 part of fiber, 2.02-4.04 parts of thixotropic agent, 2-3 parts of redispersible polymer latex powder, 0.5-1.5 parts of accelerator, 0.015-0.025 part of cellulose ether, 0.01-0.03 part of water reducer and 60-70 parts of sand.
2. The machine-sprayed polymeric anti-crack plastering mortar of claim 1, wherein the cement is selected from PO42.5 portland cement.
3. The machine-sprayed polymeric anti-crack plastering mortar of claim 1, wherein the fly ash is selected from class II fly ash.
4. The machine-sprayed polymer anti-crack plastering mortar of claim 1, wherein the fibers are a mixture of polypropylene fibers and polyacrylonitrile fibers, and the weight ratio of the polypropylene fibers to the polyacrylonitrile fibers is 1: 0.2-0.5.
5. The machine-sprayed polymer anti-cracking plastering mortar of claim 1, wherein the thixotropic agent is a mixture of hydroxypropyl starch ether and magnesium aluminum silicate, and the weight ratio of the hydroxypropyl starch ether to the magnesium aluminum silicate is 0.02-0.04: 2-4.
6. The machine-sprayed polymer anti-cracking plastering mortar of claim 1, wherein the redispersible polymer latex powder is prepared by the following method:
dissolving the end-mercapto polyvinyl alcohol in water at 90-93 ℃, adding methyl methacrylate and sodium bicarbonate into the end-mercapto polyvinyl alcohol aqueous solution at 78-82 ℃, uniformly mixing, adding an initiator aqueous solution with the weight percentage concentration of 1%, and carrying out heat preservation reaction for 1 hour; maintaining the reaction temperature of 78-82 ℃, simultaneously dropwise adding a mixed monomer of methyl methacrylate, triisopropoxysilylpropyl methacrylate, 4,4, 4-trifluoro-2-butenol and phosphoenolpyruvic acid and an initiator aqueous solution with the weight percentage concentration of 1%, controlling the dropwise adding time of the mixed monomer to be 5 hours, and controlling the dropwise adding time of the initiator aqueous solution with the weight percentage concentration of 1% to be 6 hours; after the mixed monomers are added successively, keeping the temperature and reacting for 1 hour to obtain polymer emulsion; 5-8 parts of mercapto-terminated polyvinyl alcohol, 140 parts of water 130-one, 8-10 parts of methyl methacrylate, 1-2 parts of sodium bicarbonate, 15-20 parts of the initial addition amount of 1% by weight of initiator aqueous solution, 50-55 parts of methyl methacrylate, 55-60 parts of triisopropoxypropyl methacrylate propyl ester, 15-20 parts of 4,4, 4-trifluoro-2-butenol, 10-15 parts of phosphoenolpyruvic acid and 50-60 parts of 1% by weight of the secondary addition amount of 1% by weight of initiator aqueous solution;
the weight ratio of the components is 1: 0.2-0.25 of polymer emulsion and 10 percent of aqueous solution of the polyvinyl alcohol by weight percentage concentration, adopting a pH regulator to adjust the pH value of the mixture to 8.5, and obtaining the redispersible polymer latex powder by spray drying.
7. The machine-sprayed polymeric crack-resistant render mortar of claim 6, wherein the initiator is selected from ammonium persulfate.
8. The machine-sprayed polymeric crack-resistant render mortar of claim 6, wherein the pH modifier is selected from an aqueous solution of sodium hydroxide having a concentration of 5% by weight.
9. The machine-sprayed polymer anti-cracking plastering mortar of claim 1, wherein the water reducing agent is selected from polycarboxylic acid water reducing agent powders.
10. The machine-sprayed polymeric crack resistant render mortar of claim 1, wherein the sand is selected from sand in zone II.
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