CN116144212B - Exterior wall putty free of alkali-resistant primer coating and preparation method and application thereof - Google Patents
Exterior wall putty free of alkali-resistant primer coating and preparation method and application thereof Download PDFInfo
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- CN116144212B CN116144212B CN202211728640.5A CN202211728640A CN116144212B CN 116144212 B CN116144212 B CN 116144212B CN 202211728640 A CN202211728640 A CN 202211728640A CN 116144212 B CN116144212 B CN 116144212B
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- putty
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- 239000003513 alkali Substances 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002987 primer (paints) Substances 0.000 title description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 68
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 238000000576 coating method Methods 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 27
- 239000006004 Quartz sand Substances 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000003365 glass fiber Substances 0.000 claims abstract description 12
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical group [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920002472 Starch Polymers 0.000 claims description 56
- 239000008107 starch Substances 0.000 claims description 56
- 235000019698 starch Nutrition 0.000 claims description 56
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 30
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical group FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 claims description 29
- 229920000856 Amylose Polymers 0.000 claims description 27
- 239000003973 paint Substances 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 14
- 239000012750 alkali resistant agent Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000000967 suction filtration Methods 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 229920002678 cellulose Polymers 0.000 claims description 7
- 239000001913 cellulose Substances 0.000 claims description 7
- -1 snow white Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000002386 leaching Methods 0.000 claims description 3
- 238000010257 thawing Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 235000015256 Chionanthus virginicus Nutrition 0.000 claims description 2
- 241000234283 Galanthus nivalis Species 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 8
- 229960001484 edetic acid Drugs 0.000 description 34
- 239000000126 substance Substances 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 22
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 17
- 238000012360 testing method Methods 0.000 description 17
- 239000000292 calcium oxide Substances 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 10
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 9
- 229910001424 calcium ion Inorganic materials 0.000 description 9
- 238000007790 scraping Methods 0.000 description 9
- 238000006703 hydration reaction Methods 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 238000004090 dissolution Methods 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 230000000536 complexating effect Effects 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 230000002028 premature Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000007908 dry granulation Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 229920000881 Modified starch Polymers 0.000 description 2
- 239000004368 Modified starch Substances 0.000 description 2
- 206010042496 Sunburn Diseases 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 235000019426 modified starch Nutrition 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229920000945 Amylopectin Polymers 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000013615 primer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/34—Filling pastes
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of putty for building outer walls, and in particular discloses outer wall putty free of alkali-resistant primer, a preparation method and application thereof. The exterior wall putty free of the alkali-resistant primer comprises the following raw materials in parts by weight: 250-350 parts of cement, 0.8-1.5 parts of glass fiber, 90-110 parts of snow white, 280-320 parts of quartz sand with the granularity grade of 70-140 meshes, 280-320 parts of quartz sand with the granularity grade of 50-100 meshes, 3.5-4.5 parts of hydroxypropyl methyl cellulose, 15-20 parts of rubber powder, 20-30 parts of alkali resistance agent, wherein the alkali resistance agent is ammonium oxalate and 500-520 parts of water; the preparation method comprises the following steps: and mixing the raw materials of the exterior wall putty with water to obtain a premix, and uniformly mixing the auxiliary film forming agent with the premix to obtain the exterior wall putty. The exterior wall putty provided by the application can be used for construction of exterior wall coating systems, and has the advantage of difficult alkali reversion.
Description
Technical Field
The application relates to the technical field of putty for building outer walls, in particular to outer wall putty free of alkali-resistant primer, a preparation method and application thereof.
Background
The putty is generally used in the low treatment step of the building outer wall, and plays roles in leveling a base layer, filling the defects of the base layer and preventing cracking.
The thick coating system of the building outer wall comprises the working procedures of scraping and leveling putty, coating alkali-resistant primer, coating the same color middle paint, coating main material decorative paint, coating finish paint and the like, finally, the outer wall surface is obtained, the working procedure of coating alkali-resistant primer is carried out after the finishing of scraping and scraping of the putty layer, the standard that the pH is less than 10 and the humidity is less than 10 percent, the alkali-resistant primer is transparent, most of the inside is emulsion with penetrating effect, the emulsion has the functions of entering the putty layer, reinforcing the putty layer, forming a film on the putty surface, preventing alkaline substances in the putty layer from being flooded out, and the important working procedure of coating alkali-resistant primer on the surface of the putty layer is the important working procedure for reducing the alkali-resistant phenomenon of the building outer wall surface.
At present, related putty powder comprises cement, rubber powder, cellulose, quartz sand and the like, the putty powder is mixed with water to obtain leveling putty for batch scraping, the cement contains a large amount of alkaline substances and salts, such as calcium hydroxide generated by calcium oxide when meeting water, and the like, after the putty powder is scraped in a construction site for the purpose of expelling the construction period, the next working procedure can be carried out without the alkali-resistant primer coating working procedure, and because the alkali-resistant primer is transparent, the working procedure is not easy to be seen during construction, thus the labor of workers can be reduced, and the material cost is saved.
However, the process of coating alkali-resistant primer is not performed, after raining, the surface of the outer wall meets water and permeates into a putty layer, alkaline substances in the outer wall are carried out, the alkaline substances are continuously accumulated on the wall surface and react with carbon dioxide, sulfur dioxide and the like in the air to generate precipitation on the wall surface, namely, the phenomenon of alkali resistance of the wall surface occurs, and the appearance of the wall surface is affected.
Disclosure of Invention
In order to reduce the phenomenon of alkali reflection of the wall surface under the condition of not coating alkali-resistant primer, the application provides an exterior wall putty free of alkali-resistant primer, and a preparation method and application thereof.
The application provides exterior wall putty free of alkali-resistant primer, which adopts the following technical scheme:
in a first aspect, the application provides exterior wall putty free of alkali-resistant primer, which adopts the following technical scheme:
an exterior wall putty free of coating alkali-resistant primer comprises the following raw materials in parts by weight:
250-350 parts of cement and the balance of the cement,
0.8-1.5 parts of glass fiber,
90-110 parts of snow flower white,
280 to 320 parts of quartz sand with the granularity grade of 70 to 140 meshes,
280-320 parts of quartz sand with the granularity grade of 50-100 meshes,
3.5 to 4.5 parts of hydroxypropyl methyl cellulose,
15-20 parts of rubber powder,
20-30 parts of alkali resistant agent, wherein the alkali resistant agent is ammonium oxalate,
500-520 parts of water.
By adopting the technical scheme, cement is used as a cementing material, and the outer wall putty has better strength through hydration reaction; the glass fiber enables the exterior wall putty to have better crack resistance; the snow white and the quartz sand with different granularity grades can play a good filling role; the hydroxypropyl methyl cellulose plays roles of water retention and quick adhesion, reduces the condition that cracks appear in the putty layer due to too fast water loss, improves the adhesive force of the putty, and prolongs the operability of the putty; the rubber powder increases the workability of the exterior wall putty and improves the viscosity of the putty;
the main alkali-resistant substance in the putty powder raw material is cement, the main chemical component of the cement is CaO=64-67%, and SiO 2 ＝20-23％，Al 2 O 3 ＝4-8％，Fe 2 O 3 The finished cement mainly comprises tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite and some free calcium oxide, calcium hydroxide is generated after hydration reaction, so that the outer side of the putty layer can react with carbon dioxide in the air after being carried out by rainwater under the condition that alkali-resistant primer is not coated, and calcium carbonate is generated to be deposited on the surface of an outer wall, which is also a main reason for alkali resistance of the outer wall.
Under the condition that the hydration reaction of the cement is not affected, the addition of ammonium oxalate can react with free calcium oxide in the cement to generate calcium oxalate, and the condition that calcium oxide directly reacts with water to generate calcium hydroxide is reduced, so that the content of alkaline products in the exterior wall putty is reduced, and the generation of calcium oxalate is favorable for the strength of the putty layer after formation.
Preferably, the raw materials also comprise 30-50 parts of film forming agent, wherein the film forming agent comprises 20-30 parts of starch and 10-20 parts of ethylenediamine tetraacetic acid.
By adopting the technical scheme, the starch has the functions of thickening and tackifying, plays a role in adhesion and reduces the powder removal of putty; the film forming agent formed by mixing the starch and the ethylenediamine tetraacetic acid is added into the putty raw material, and the ethylenediamine tetraacetic acid is slowly released along with the dissolution and diffusion process of the starch, so that the premature complexing of the ethylenediamine tetraacetic acid with calcium ions in cement is reduced, and the cement hydration reaction is influenced; and in the process of stretching the molecular chain of the starch, the ethylenediamine tetraacetic acid can complex calcium ions in calcium oxalate to form a stable complex, the complex and the starch act synergistically to form a protective film on the surface of the putty layer, so that the situation that alkali substances are separated out from the putty layer to cause alkali reflection of the outer wall surface is reduced.
Preferably, the preparation step of the film forming agent comprises the steps of premixing the starch and the ethylenediamine tetraacetic acid, and then carrying out dry granulation to obtain the film forming agent.
According to the technical scheme, starch and ethylenediamine tetraacetic acid are subjected to dry granulation to enable ethylenediamine tetraacetic acid to be wrapped by starch, ammonium oxalate reacts with free calcium oxide in cement to form calcium oxalate in the process of mixing putty powder and water, along with the gradual stretching of a molecular chain of the starch, the ethylenediamine tetraacetic acid is released, calcium ions in the calcium oxalate are complexed, a stable complex is further formed, the complex and the starch act on the surface of the putty powder together, a protective film for reducing precipitation of alkaline products is formed, and the condition of wall surface alkali reflection is reduced.
Preferably, the starch is amylose.
By adopting the technical scheme, the dissolution rate of the amylose is slower, and the ethylenediamine tetraacetic acid can be slowly released in the slow extension process of the amylose, so that the premature complexing of the ethylenediamine tetraacetic acid in the early stage is reduced, and the hydration reaction of cement is influenced.
Preferably, the amylose is modified amylose, and the modification process is as follows:
firstly, placing amylose into hydrochloric acid solution for acidolysis, carrying out vacuum suction filtration after acidolysis to obtain solid starch, then placing the solid starch into sodium hydroxide solution for neutralization to enable the pH value of the obtained starch to be neutral, carrying out suction filtration, leaching and airing again, adding distilled water for stirring, placing at the temperature of minus 18 ℃ for preserving for 12 hours, and then thawing, carrying out suction filtration, washing and drying to obtain the modified amylose.
By adopting the technical scheme, the modified amylose can remarkably delay the gelation of starch, ensure good workability in puttying, and after finishing puttying of a later putty layer, the modified amylose can form a film on the surface of the putty layer, and the modified starch has good crystallinity, so that the film forming effect is better, and alkaline substance precipitation is reduced.
Preferably, the raw materials further comprise 20-30 parts of a film forming assistant, wherein the film forming assistant is hexafluoroisopropanol.
By adopting the technical scheme, the hexafluoroisopropanol has strong polarity and strong solubility to macromolecular compounds and polymers, and is added as an auxiliary film forming agent, on one hand, the hexafluoroisopropanol can be dissolved to the film forming agent and the generated complex, and as the hexafluoroisopropanol has strong volatility, the complex is brought to the surface of the putty layer along with volatilization of the hexafluoroisopropanol, so that a protective film for reducing precipitation of alkaline substances is automatically formed on the surface of the putty layer, and the generation of the phenomenon of alkali reflection of an outer wall is reduced;
on the other hand, the fluorine-containing structure of the hexafluoroisopropanol ensures that the hexafluoroisopropanol has good hydrophobicity, and the hexafluoroisopropanol also contains hydroxyl, so that the hexafluoroisopropanol can react with starch through hydrogen bonds, and the film forming agent and the film forming assistant agent have hydrophobicity after forming films on the surface of the putty layer, so that the situation that alkaline substances are brought out by rainwater entering the putty layer to cause alkali reflection on the outer wall surface is reduced.
In a second aspect, the application provides a preparation method of an exterior wall putty free of alkali-resistant primer, which adopts the following technical scheme:
a preparation method of exterior wall putty free of alkali-resistant primer comprises the following steps,
s1: mixing cement, glass fiber, snow white, quartz sand with the granularity grade of 70-140 meshes, quartz sand with the granularity grade of 50-100 meshes, cellulose, rubber powder, an alkali resistant agent, a film forming agent and water to obtain a premix;
s2: and uniformly mixing the auxiliary film forming agent and the premix to obtain the exterior wall putty.
By adopting the technical scheme, the alkali resistant agent and water firstly react to generate calcium oxalate, along with the dissolution of starch in the film forming agent, ethylenediamine tetraacetic acid slowly dissolves out to complex calcium oxalate to form a stable complex, the film forming agent is added into the premix, on one hand, the dispersibility of the film forming agent is improved, on the other hand, the film forming agent dissolves the complex, starch and other substances, the putty layer is formed after the putty is scraped, the starch and the complex are brought to the surface of the putty layer to form a film by volatilization of hexafluoroisopropanol, and part of hexafluoroisopropanol is positioned on the surface of the putty layer due to the hydrogen bonding effect, so that the subsequent rainfall is reduced to bring alkaline substances out of the putty layer by rainwater, and the condition of alkali reflection on the outer wall surface is caused.
In a third aspect, the application provides a preparation method of an exterior wall putty free of alkali-resistant primer, which adopts the following technical scheme:
the application of the exterior wall putty without the alkali-resistant primer is that the exterior wall putty is applied to an exterior wall coating system, and the exterior wall coating system comprises the procedures of scraping exterior wall putty, coating the same-color middle paint, coating the main material decorative paint, coating the finish paint and the like.
By adopting the technical scheme, the exterior wall putty is applied to the construction process of an exterior wall coating system, so that the phenomenon of alkali reflection of a wall surface is not easy to occur under the condition that the process of coating alkali-resistant primer is not carried out, the construction process is saved, the construction cost is reduced, and the attractiveness of the exterior wall surface is ensured.
In summary, the application has the following beneficial effects:
1. the application adopts ammonium oxalate, and the addition of ammonium oxalate can react with free calcium oxide in cement to generate calcium oxalate, so that the condition that calcium oxide directly reacts with water to generate calcium hydroxide is reduced, the content of alkaline products in the exterior wall putty is reduced, and the generation of calcium oxalate is beneficial to the strength after the putty layer is formed.
2. In the application, starch and ethylenediamine tetraacetic acid are preferably used as film forming agents, and the starch has the functions of thickening and tackifying, plays a role of adhesion and reduces putty powder removal; the film forming agent formed by mixing the starch and the ethylenediamine tetraacetic acid is added into the putty raw material, and the ethylenediamine tetraacetic acid is slowly released along with the dissolution and diffusion process of the starch, so that the premature complexing of the ethylenediamine tetraacetic acid with calcium ions in cement is reduced, and the cement hydration reaction is influenced; and in the process of stretching the molecular chain of the starch, the ethylenediamine tetraacetic acid can complex calcium ions in calcium oxalate to form a stable complex, the complex and the starch act synergistically to form a protective film on the surface of the putty layer, so that the situation that alkali substances are separated out from the putty layer to cause alkali reflection of the outer wall surface is reduced.
3. According to the method, the pre-mixture is obtained by mixing, and then the auxiliary film forming agent and the pre-mixture are uniformly mixed to obtain the exterior wall putty, so that on one hand, the dispersibility of the auxiliary film forming agent is improved, on the other hand, the auxiliary film forming agent dissolves substances such as the complex and starch, and the like, a putty layer is formed after the putty is scraped, the starch and the complex are brought to the surface of the putty layer to form a film by volatilization of hexafluoroisopropanol, and part of hexafluoroisopropanol is positioned on the surface of the putty layer due to the action of hydrogen bonds, so that the situation that alkaline substances of the putty layer are brought out by rainwater caused by subsequent rainfall is reduced, and alkali reflection of the exterior wall surface is caused.
Detailed Description
Drawings
Fig. 1 is a graph showing the experimental results of application example 10 after 4 weeks of the rain wash test.
Fig. 2 is a graph showing the experimental results of comparative application example 7 after 4 weeks of the rain wash test.
The raw material sources are as follows:
cement strength grade 42.5, available from Jin Yuji east (tangshan) concrete environmental protection technology group limited;
glass fibers, average length 3mm, purchased from beijing office Li Heng lignocellulosic technology development center;
snow white with a particle size rating of 200 mesh, available from Qu Yangde tai mineral products limited;
quartz sand with a particle size grade of 70-140 mesh, available from new sunburn modeling materials limited;
quartz sand with a particle size class of 50-100 mesh, available from new sunburn modeling materials limited;
hydroxypropyl methylcellulose, available from Shandong Heda group Co., ltd;
the rubber powder comprises ethylene-vinyl acetate polymer, which is purchased from Anhui Vigor New materials Co., ltd;
the finish paint, the decorative paint and the middle paint are all common commercial products and are purchased from Tianjin De Praver paint Co., ltd;
all the raw materials of the embodiment of the application can be obtained through the market, and the raw material manufacturer discloses the raw materials only for fully disclosing the raw materials and does not limit the protection scope.
Examples
Example 1
An exterior wall putty free of coating alkali-resistant primer comprises the following raw materials in parts by weight:
300kg of cement, 1kg of glass fiber, 100kg of snow white, 300kg of quartz sand with the granularity grade of 70-140 meshes, 300kg of quartz sand with the granularity grade of 50-100 meshes, 3.8kg of hydroxypropyl methyl cellulose, 18kg of rubber powder, 25kg of alkali resistance agent, 510kg of ammonium oxalate and 510kg of water;
the preparation method of the exterior wall putty free of the alkali-resistant primer comprises the following steps:
mixing cement, glass fiber, snow white, quartz sand with the granularity grade of 70-140 meshes, quartz sand with the granularity grade of 50-100 meshes, cellulose, rubber powder, alkali resistant agent and water to obtain the exterior wall putty.
Examples 2 to 3
The exterior wall putty free of coating alkali-resistant primer is based on the embodiment 1, and is different in the proportion of raw materials.
The amounts of the raw materials used in examples 1 to 3 are shown in Table 1.
TABLE 1 raw materials amounts of exterior wall putty of examples 1-3
Example 4
Based on the embodiment 1, the exterior wall putty free of coating alkali-resistant primer is characterized in that 40kg of film forming agent is added into the raw materials, and the film forming agent comprises 25kg of starch and 15kg of ethylene diamine tetraacetic acid; wherein the starch is amylose;
the preparation method of the film forming agent comprises the steps of premixing amylose and ethylenediamine tetraacetic acid, and then granulating by a dry method to obtain the film forming agent; the preparation method of the exterior wall putty comprises the following steps:
mixing cement, glass fiber, snow white, quartz sand with the granularity grade of 70-140 meshes, quartz sand with the granularity grade of 50-100 meshes, cellulose, rubber powder, alkali resistance agent, film forming agent and water to obtain the exterior wall putty.
Example 5
The exterior wall putty free of coating alkali-resistant primer is based on the embodiment 4, and is characterized in that the addition amount of the film forming agent is different, 30kg of the film forming agent is added into the raw materials, and the film forming agent comprises 20kg of starch and 10kg of ethylenediamine tetraacetic acid.
Example 6
The exterior wall putty free of coating alkali-resistant primer is based on the embodiment 4, and is characterized in that the addition amount of the film forming agent is different, 50kg of the film forming agent is added into the raw materials, and the film forming agent comprises 30kg of starch and 20kg of ethylenediamine tetraacetic acid.
Example 7
An exterior wall putty free of coating alkali-resistant primer is based on the embodiment 4, wherein the preparation step of the film forming agent comprises the step of directly mixing amylose and ethylene diamine tetraacetic acid to prepare the film forming agent.
Example 8
An alkali-free primer-free exterior wall putty is based on example 4, which differs in that the amylose is replaced by an equivalent amount of amylopectin.
Example 9
The exterior wall putty free of coating alkali-resistant primer is based on the embodiment 4, and is characterized in that the added amylose is modified amylose, and the modification process is as follows:
firstly, 50kg of amylose is put into 2.0mol/L hydrochloric acid solution to be evenly mixed for acidolysis for 5d, the weight ratio of the amylose to the hydrochloric acid solution is 1:3, the solid starch is obtained by decompression and suction filtration after acidolysis, then the solid starch is put into sodium hydroxide solution to be neutralized, the pH value of the obtained starch is 7, and after suction filtration, leaching and airing are carried out again, 500ml of distilled water is added to be stirred, and the mixture is stored at the temperature of minus 18 ℃ for 12h, and then the modified amylose is obtained after thawing, suction filtration, washing and drying.
Example 10
Based on the embodiment 9, the exterior wall putty free of coating alkali-resistant primer is characterized in that 25kg of auxiliary film forming agent is added into the raw materials, and the auxiliary film forming agent is hexafluoroisopropanol;
the preparation method of the exterior wall putty comprises the following steps:
s1: mixing cement, glass fiber, snow white, quartz sand with the granularity grade of 70-140 meshes, quartz sand with the granularity grade of 50-100 meshes, cellulose, rubber powder, an alkali resistant agent, a film forming agent and water to obtain a premix;
s2: and uniformly mixing the auxiliary film forming agent and the premix to obtain the exterior wall putty.
Example 11
Based on the embodiment 10, the exterior wall putty free of coating alkali-resistant primer is different in that the usage amount of the auxiliary film forming agent is different, 20kg of the auxiliary film forming agent is added into the raw materials, and the auxiliary film forming agent is hexafluoroisopropanol.
Example 12
Based on the embodiment 10, the exterior wall putty free of coating alkali-resistant primer is different in that the usage amount of the auxiliary film forming agent is different, 30kg of the auxiliary film forming agent is added into the raw materials, and the auxiliary film forming agent is hexafluoroisopropanol.
Example 13
Based on the embodiment 10, the exterior wall putty free of coating alkali-resistant primer is different in that the preparation method of the exterior wall putty comprises the following steps:
and directly and uniformly mixing cement, glass fiber, snow white, quartz sand with the granularity grade of 70-140 meshes, quartz sand with the granularity grade of 50-100 meshes, cellulose, rubber powder, an alkali resistant agent, a film forming agent, water and a film aiding agent to obtain the exterior wall putty.
Comparative example
Comparative example 1
An exterior wall putty was different from example 1 in that the amount of alkali-resistant agent used was 0kg.
Comparative example 2
An exterior wall putty was different from example 1 in that ammonium oxalate was replaced with an equivalent amount of ammonium chloride.
Comparative example 3
An exterior wall putty differs from example 4 in that the amount of starch in the film former is 0kg.
Comparative example 4
An exterior wall putty differs from example 4 in that the amount of ethylenediamine tetraacetic acid in the film former is 0kg.
Comparative example 5
An exterior wall putty was different from example 4 in that ethylenediamine tetraacetic acid was replaced with an equivalent amount of amino acid.
Comparative example 6
An exterior wall putty was different from example 10 in that hexafluoroisopropanol was replaced with an equal amount of isopropanol.
Comparative example 7
An exterior wall putty based on example 10 was distinguished by using a commercially available common exterior wall leveling putty.
Application example
Application example 1-application example 13
The application of the exterior wall putty without the alkali-resistant primer is characterized in that the exterior wall putty is scraped on the surface of an exterior wall, naturally dried for 24 hours after the scraping is finished, and then the working procedures of rolling and coating the same-color middle paint, main material decorative paint, finish paint and the like are sequentially carried out;
wherein the exterior wall putty is prepared from example 1 to example 13 in order.
Application example 14
The application of the exterior wall putty free of coating alkali-resistant primer is based on application example 10, the exterior wall putty is scraped on the surface of an exterior wall, naturally dried for 20 hours after the scraping is finished, and then rolling-coating the same-color intermediate coat, main material decorative paint, finish coat paint and other procedures are sequentially carried out.
Application example 15
The application of the exterior wall putty free of coating alkali-resistant primer is based on application example 10, the exterior wall putty is scraped on the surface of an exterior wall, naturally dried for 16 hours after the scraping is finished, and then rolling-coating the same-color intermediate coat, main material decorative paint, finish coat paint and other procedures are sequentially carried out.
Comparative application example
Comparative application example 1-comparative application example 7
The application of the exterior wall putty without the alkali-resistant primer is characterized in that the exterior wall putty is scraped on the surface of an exterior wall, naturally dried for 24 hours after the scraping is finished, and then the working procedures of rolling and coating the same-color middle paint, main material decorative paint, finish paint and the like are sequentially carried out;
wherein the exterior wall putty is prepared from comparative example 1 to comparative example 7 in order.
Performance test
The test comprises the following steps:
1. reverse alkali test for wall surface flushing by rain
The reason why the rain wash test was conducted is that the main component of rain water was H 2 O, with small amounts of sulfur dioxide and nitrogen dioxide, sulfur dioxide in rainwater as H 2 SO 3 The pH value of the rainwater is about 5.6 under normal conditions, the main components of the rainwater and the underground water are different, the main components of the underground water are various dissolved ion components, wherein the content of the components such as chloride ion, sulfate ion, bicarbonate ion, sodium ion, potassium ion, calcium ion, magnesium ion and the like is the highest, so that the test for the alkali-back phenomenon of the exterior wall putty is carried out in a rainwash environment;
if the wall surface appears a whitening alkali-resistant substance after rain, the whitening alkali-resistant substance is mainly Ca (OH) 2 +CO 2 +H 2 O→CaCO 3 And then Ca (OH) 2 +SO 2 +H 2 O→CaSO 3 ∈, and some other insoluble white salts and alkalis.
The test wall surfaces prepared in application examples 1-15 and comparative application examples 1-7 are subjected to natural curing for 48, subjected to two-field heavy rain flushing every week, observed for alkali reaction after 1 week, 2 weeks and 4 weeks, found out that 5 people with normal vision form an evaluation group, and give alkali reaction test evaluation to the test wall surfaces, and the evaluation results are shown in table 2.
TABLE 2 results of the anti-alkali test on test wall surfaces of application examples 1 to 15 and comparative application examples 1 to 7
The experimental result diagram of the wall surface of application example 10 after 4 weeks of rain wash is shown in fig. 1, and the experimental result diagram of the wall surface of comparative application example 7 after 4 weeks of rain wash is shown in fig. 2, which shows that the exterior wall putty of the application still has good alkali-resistant effect under the condition of not coating alkali-resistant primer, and ensures the aesthetic property of the wall surface;
as can be seen from the combination of application examples 1-3 and comparative application examples 1-2 and the combination of Table 2, the results of the alkali-resistant test of the exterior wall putty of application examples 1-3 are superior to those of comparative application examples 1-2, and it is demonstrated that the addition of ammonium oxalate can react with free calcium oxide in cement to generate calcium oxalate, and the condition that calcium oxide directly reacts with water to generate calcium hydroxide is reduced, so that the content of alkaline products in the exterior wall putty is reduced, and the generation of calcium oxalate is beneficial to the strength after the putty layer is formed.
As can be seen by combining application examples 4-6 and application example 1 and combining Table 2, the anti-alkali test results of the exterior wall putty of application examples 4-6 are superior to application example 1, and the film forming agent forms a protective film on the surface of the putty layer, so that the situation that alkali substances are separated out from the putty layer to cause the occurrence of anti-alkali on the exterior wall surface is reduced.
As can be seen by combining application example 4 and comparative application examples 3-5 and combining table 2, the anti-alkali test result of the exterior wall putty of application example 4 is superior to that of comparative application examples 3-5, which shows that the starch has the functions of thickening and tackifying, plays a role of adhesion and reduces the powder removal of the putty; the film forming agent formed by mixing the starch and the ethylenediamine tetraacetic acid is added into the putty raw material, and the ethylenediamine tetraacetic acid is slowly released along with the dissolution and diffusion process of the starch, so that the premature complexing of the ethylenediamine tetraacetic acid with calcium ions in cement is reduced, and the cement hydration reaction is influenced; and in the process of stretching the molecular chain of the starch, the ethylenediamine tetraacetic acid can complex calcium ions in calcium oxalate to form a stable complex, the complex and the starch act synergistically to form a protective film on the surface of the putty layer, so that the situation that alkali substances are separated out from the putty layer to cause alkali reflection of the outer wall surface is reduced.
As can be seen from the combination of application examples 7 and 4 and the combination of table 2, the results of the alkali-resistant test of the exterior wall putty of application example 4 are superior to application example 7, and it is shown that starch and ethylenediamine tetraacetic acid are subjected to dry granulation to enable ethylenediamine tetraacetic acid to be wrapped by starch, in the process of mixing putty powder and water, ammonium oxalate reacts with free calcium oxide in cement to form calcium oxalate, along with the gradual stretching of molecular chains of starch, ethylenediamine tetraacetic acid is released and calcium ions in calcium oxalate are complexed, stable complex is further formed, the complex and starch act on the surface of putty powder together, a protective film for reducing precipitation of alkaline products is formed, and the alkali-resistant condition of the wall surface is reduced.
As can be seen from the combination of application examples 8 and 4 and the combination of Table 2, the results of the alkali-resistant test of the exterior wall putty of application example 4 are superior to those of application example 8, which shows that the dissolution rate of the amylose is slower, and the ethylenediamine tetraacetic acid can be slowly released in the slow extension process of the amylose, so that the premature complexing of the ethylenediamine tetraacetic acid in the early stage is reduced, and the hydration reaction of cement is affected.
As can be seen from the combination of application example 9 and application example 4 and the combination of table 2, the anti-alkali test result of the exterior wall putty of application example 9 is better than application example 4, which shows that the modified amylose can significantly delay the gelation of starch, so that good workability is ensured during puttying, and after finishing the puttying of the putty layer in the later period, the modified amylose can form a film on the surface of the putty layer, and the modified starch has good crystallinity, better film forming effect, and is beneficial to reducing the precipitation of alkaline substances.
As can be seen from the combination of application examples 9-12 and comparative application examples 6-7 and the combination of table 2, application examples 9-12 are better than comparative application examples 6-7, and application examples 10-12 are better than application example 9 in that hexafluoroisopropanol is added as a film forming aid, on one hand, hexafluoroisopropanol can dissolve the film forming agent and the generated complex, and as hexafluoroisopropanol has stronger volatility, the complex is brought to the surface of the putty layer along with volatilization of hexafluoroisopropanol, so that a protective film for reducing precipitation of alkaline substances is automatically formed on the surface of the putty layer, and the generation of the alkali-back phenomenon of the outer wall is reduced;
on the other hand, the fluorine-containing structure of the hexafluoroisopropanol ensures that the hexafluoroisopropanol has good hydrophobicity, and the hexafluoroisopropanol also contains hydroxyl, so that the hexafluoroisopropanol can react with starch through hydrogen bonds, and the film forming agent and the film forming assistant agent have hydrophobicity after forming films on the surface of the putty layer, so that the situation that alkaline substances are brought out by rainwater entering the putty layer to cause alkali reflection on the outer wall surface is reduced.
As can be seen by combining application example 13 and application example 10 and combining Table 2, application example 10 is superior to application example 13, the preparation method of the application is illustrated, the alkali inhibitor and water react first to generate calcium oxalate, along with the dissolution of starch in the film forming agent, ethylenediamine tetraacetic acid slowly dissolves out to complex calcium oxalate to form a stable complex, the film forming agent is added into the premix, on one hand, the dispersibility of the film forming agent is improved, on the other hand, the film forming agent dissolves the complex, starch and other substances, and the putty layer is formed after the putty is scraped, the volatilization of hexafluoroisopropanol brings the starch and the complex to the surface of the putty layer to form a film, and part of hexafluoroisopropanol is positioned on the surface of the putty layer due to the hydrogen bond effect, so that the subsequent rainfall is reduced to bring alkaline substances of the putty layer out, and the condition of alkali reflection occurs on the outer wall surface.
As can be seen by combining application example 10 and application examples 14-15 and combining Table 2, the wall surface alkali-resistant effects of application example 10 and application example 14 are basically the same and are better than those of application example 15, and the addition of hexafluoroisopropanol as a film forming assistant agent can shorten the drying time of the putty layer, shorten the construction time to a certain extent and ensure that the alkali-resistant phenomenon of the putty layer is not easy to occur.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (5)
1. The exterior wall putty free of coating alkali-resistant primer is characterized by comprising the following raw materials in parts by weight:
250-350 parts of cement and the balance of the cement,
0.8-1.5 parts of glass fiber,
90-110 parts of snow flower white,
280 to 320 parts of quartz sand with the granularity grade of 70 to 140 meshes,
280-320 parts of quartz sand with the granularity grade of 50-100 meshes,
3.5 to 4.5 parts of hydroxypropyl methyl cellulose,
15-20 parts of rubber powder,
20-30 parts of alkali resistant agent, wherein the alkali resistant agent is ammonium oxalate,
500-520 parts of water;
the raw materials also comprise 30-50 parts of film forming agent, wherein the film forming agent comprises 20-30 parts of starch and 10-20 parts of ethylenediamine tetraacetic acid;
the preparation method of the film forming agent comprises the steps of premixing the starch and the ethylenediamine tetraacetic acid, and then granulating by a dry method to obtain the film forming agent;
the starch is amylose.
2. The exterior wall putty for a non-coating alkali-resistant primer as set forth in claim 1, wherein: the amylose is modified amylose, and the modification process is as follows:
firstly, placing amylose into hydrochloric acid solution for acidolysis, carrying out vacuum suction filtration after acidolysis to obtain solid starch, then placing the solid starch into sodium hydroxide solution for neutralization to enable the pH value of the obtained starch to be neutral, carrying out suction filtration, leaching and airing again, adding distilled water for stirring, placing at the temperature of minus 18 ℃ for preserving for 12 hours, and then thawing, carrying out suction filtration, washing and drying to obtain the modified amylose.
3. The exterior wall putty for a non-coating alkali-resistant primer as set forth in claim 1, wherein: the raw materials also comprise 20-30 parts of auxiliary film forming agent, wherein the auxiliary film forming agent is hexafluoroisopropanol.
4. A method for preparing the exterior wall putty without coating alkali-resistant primer as set forth in any one of claims 1-3, characterized in that: comprises the steps of,
s1: mixing cement, glass fiber, snow white, quartz sand with the granularity grade of 70-140 meshes, quartz sand with the granularity grade of 50-100 meshes, cellulose, rubber powder, an alkali resistant agent, a film forming agent and water to obtain a premix;
s2: and uniformly mixing the auxiliary film forming agent and the premix to obtain the exterior wall putty.
5. An application of an exterior wall putty free of coating alkali-resistant primer is characterized in that: the use of the exterior wall putty as set forth in any one of claims 1-4 in an exterior wall coating system comprising the steps of doctoring exterior wall putty, applying a same color basecoat, applying a main material decorative paint and applying a topcoat.
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