High-toughness high-adhesion modified polyurethane building waterproof coating

Abstract

The invention relates to a high-toughness and high-adhesion modified polyurethane building waterproof coating, the building waterproof coating comprises modified polyurethane, fluorocarbon alcohol, a chain extender, a plasticizer and a solvent, and the modified polyurethane has the following structural formula: # imgabs0 #. The modified polyurethane building waterproof coating provided by the invention not only has good hydrophobic ability, but also has good water resistance, good water resistance, good water resistance, good water resistance, good water resistance and good water resistance; and the coating has good high toughness and high adhesive force.

Description

Technical Field

[0001] The present invention relates to the technical field of building waterproofing, and in particular to a high-toughness and high-adhesion modified polyurethane building waterproofing coating. Background Art

[0002] Polyurethane waterproof coating is an isocyanate-containing prepolymer formed by addition polymerization of isocyanate, polyether, etc., with catalyst, anhydrous additive, anhydrous filler, etc., and processed by mixing and other processes. my country has promoted and applied it since the early 1980s. It is the most successful coating waterproof material used so far and occupies an important position in building waterproof applications. Polyurethane waterproof coating is widely used in tunnels, subways, high-speed railways, roofs, kitchens and bathrooms and other projects, and has good waterproof effect. Polyurethane waterproof coating is divided into two categories according to its composition and curing mechanism: single-component polyurethane waterproof coating and multi-component polyurethane waterproof coating. Since multi-component polyurethane waterproof coating needs to be mixed according to a certain proportion and mechanically stirred during on-site construction, the introduction of bubbles during the mixing process, inaccurate mixing, and uneven stirring will affect the construction quality, so waterproof quality accidents occur from time to time; while single-component polyurethane waterproof coating is a single component, ready to use, no stirring is required, reliable construction, and has been widely used.

[0003] However, traditional polyurethane coatings have poor water resistance, which seriously affects their stability and service life in humid environments. Therefore, hydrophobic modification of polyurethane coatings to enhance their water resistance has become a research direction with broad application prospects. Summary of the invention

[0004] The present invention provides a high-toughness and high-adhesion modified polyurethane building waterproof coating to solve the deficiencies in the related art.

[0005] According to a first aspect of an embodiment of the present disclosure, a high-toughness and high-adhesion modified polyurethane building waterproof coating is provided, wherein the building waterproof coating comprises modified polyurethane, fluorocarbon alcohol, chain extender, plasticizer and solvent, and the modified polyurethane has the following structural formula:

[0006]

[0007] in,

[0008] R1 is selected from wherein Ar1 and Ar2 are each independently selected from C5-C12 aryl or C4-C10 heteroaryl;

[0009] R2 is selected from *-R 21 -*; where R 21 Selected from C1-C10 alkyl or C1-C10 alkoxy;

[0010] R3 is selected from *-R 31 -*; where R 31 Selected from C3-C15 alkyl substituted with one or more fluorine atoms;

[0011] R4 is selected from

[0012] In one aspect of the disclosed embodiments, n is selected from 300-3000.

[0013] In one aspect of the disclosed embodiment, R 21 Selected from -CH2CH2-, -CH2CH2CH2-, -CH2CH2CH2CH2-, -CH2CH2CH2CH2CH2-, -CH2CH2CH2CH2CH2CH2-, -CH2CH2-O-CH2CH2-.

[0014] In one aspect of the disclosed embodiment, R 21 Selected from -CH2CH2-O-CH2CH2-.

[0015] In one aspect of the disclosed embodiment, R 31 Selected from

[0016] In one aspect of the disclosed embodiments, R4 is selected from

[0017] In one aspect of the disclosed embodiments, R4 is selected from

[0018] In one aspect of the disclosed embodiments, Ar1 and Ar2 are each independently selected from

[0019] In one aspect of the embodiments of the present disclosure, the modified polyurethane is prepared by the following steps:

[0020] Add the compound of formula II, the compound of formula III, the compound of formula IV and the compound of formula V to an organic solvent, keep stirring, use bismuth neodecanoate as a catalyst, react at 70° C.-80° C. for 1.5-2.5 hours to obtain the modified polyurethane;

[0021] The structural formulas of the compound of formula II, the compound of formula III, the compound of formula IV and the compound of formula V are as follows:

[0022]

[0023] In one aspect of the disclosed embodiments, the compound of formula II is selected from any one of the following compounds:

[0024]

[0025]

[0026] In one aspect of the embodiments of the present disclosure, the compound of formula III is selected from any one of the following compounds: OHCH2CH2CH2OH, OHCH2CH2CH2CH2OH, OHCH2CH2CH2CH2CH2OH, OHCH2CH2CH2CH2CH2CH2OH, OHCH2CH2CH2CH2CH2CH2OH, OHCH2CH2-O-CH2CH2OH.

[0027] In one aspect of the disclosed embodiments, the compound of formula IV is:

[0028]

[0029] In one aspect of the disclosed embodiments, the compound of formula V is selected from any one of the following compounds:

[0030]

[0031] In one aspect of the embodiments of the present disclosure, in the process of preparing the modified polyurethane, the compound of formula II, the compound of formula III, the compound of formula IV and the compound of formula V are added in equimolar amounts.

[0032] In one aspect of the embodiments of the present disclosure, in the process of preparing the modified polyurethane, the organic solvent is dimethyl sulfoxide.

[0033] In one aspect of the disclosed embodiment, based on the total mass of the architectural waterproof coating, the mass percentage of the modified polyurethane is selected from 25%-35%. Preferably, based on the total mass of the architectural waterproof coating, the mass percentage of the modified polyurethane is selected from 28%-32%.

[0034] Specifically, based on the total mass of the building waterproof coating, the mass percentage of the modified polyurethane can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%.

[0035] In one aspect of the disclosed embodiment, based on the total mass of the architectural waterproof coating, the mass percentage of the fluorocarbon alcohol is selected from 2%-8%. Preferably, based on the total mass of the architectural waterproof coating, the mass percentage of the fluorocarbon alcohol is selected from 4%-6%.

[0036] Specifically, based on the total mass of the building waterproof coating, the mass percentage of the fluorocarbon alcohol can be 2%, 3%, 4%, 5%, 6%, 7% or 8%.

[0037] In one aspect of the disclosed embodiment, the fluorocarbon alcohol is selected from any one of trifluoroethanol, trifluoropropanol, tetrafluoropropanol, pentafluoropropanol, trifluorobutanol, tetrafluorobutanol, pentafluorobutanol, hexafluorobutanol, heptafluorobutanol, trifluoropentanol, tetrafluoropentanol, pentafluoropentanol, hexafluoropentanol, heptafluoropentanol, octafluoropentanol, nonafluoropentanol, trifluorohexanol, tetrafluorohexanol, pentafluorohexanol, hexafluorohexanol, heptafluorohexanol, octafluorohexanol, nonafluorohexanol, decafluorohexanol, and undecafluorohexanol. Preferably, the fluorocarbon alcohol is selected from any one of trifluoroethanol, trifluoropropanol, tetrafluoropropanol, tetrafluorobutanol, pentafluorobutanol, trifluoropentanol, tetrafluoropentanol, pentafluoropentanol, heptafluoropentanol, octafluoropentanol, trifluorohexanol, tetrafluorohexanol, pentafluorohexanol, and hexafluorohexanol.

[0038] In one aspect of the disclosed embodiment, based on the total mass of the architectural waterproof coating, the mass percentage of the chain extender is selected from 5%-10%. Preferably, based on the total mass of the architectural waterproof coating, the mass percentage of the chain extender is selected from 7%-9%.

[0039] Specifically, based on the total mass of the building waterproof coating, the mass percentage of the chain extender may be 5%, 6%, 7%, 8%, 9% or 10%.

[0040] In one aspect of the disclosed embodiment, the chain extender is selected from one or more of trimethylolpropane, ethylene glycol, propylene glycol, and 1,4-butanediol. Preferably, the chain extender is selected from 1,4-butanediol.

[0041] In one aspect of the disclosed embodiment, based on the total mass of the architectural waterproof coating, the mass percentage of the plasticizer is selected from 5% to 15%. Preferably, based on the total mass of the architectural waterproof coating, the mass percentage of the plasticizer is selected from 8% to 12%.

[0042] Specifically, based on the total mass of the building waterproof coating, the mass percentage of the plasticizer can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%.

[0043] In one aspect of the disclosed embodiment, the plasticizer is selected from one or more of chlorinated paraffin, dibutyl phthalate, tributyl citrate, acetyl tributyl citrate, and epoxidized soybean oil. Preferably, the plasticizer is selected from dibutyl phthalate.

[0044] In one aspect of the embodiment of the present disclosure, the architectural waterproof coating may further include pigments and fillers. Based on the total mass of the architectural waterproof coating, the mass percentage of the pigments and fillers is selected from 0.2% to 5%.

[0045] In one aspect of the embodiments of the present disclosure, the pigment filler is selected from a mixture of any one or more of light calcium carbonate, heavy calcium carbonate, carbon black, titanium dioxide, red iron ore, montmorillonite, kaolin, barium sulfate, magnesium oxide, calcium oxide, wollastonite, silica powder, and talc.

[0046] In one aspect of the embodiments of the present disclosure, the building waterproof coating may further include polytetrahydrofuran diol, and the molecular weight of the polytetrahydrofuran diol is 1000-3000.

[0047] In one aspect of the embodiments of the present disclosure, based on the total mass of the building waterproof coating, the mass percentage of the polytetrahydrofuran diol is selected from 0.2%-5%.

[0048] In one aspect of the embodiment of the present disclosure, the architectural waterproof coating may further include an auxiliary agent, and the mass percentage of the auxiliary agent is selected from 0.1%-12% based on the total mass of the architectural waterproof coating.

[0049] In one aspect of the embodiments of the present disclosure, the auxiliary agent comprises one or more of a defoamer, a dispersant, a leveling agent, a substrate wetting agent, a surface tension additive, an anti-settling agent, a light stabilizer, and an antioxidant.

[0050] In one aspect of the embodiments of the present disclosure, the defoaming agent is selected from one or more of tributyl phosphate, defoaming agent Deqian 3100, and defoaming agent BYK088; but is not limited thereto.

[0051] In one aspect of the embodiment of the present disclosure, the dispersant is selected from polycarboxylate dispersant 5040 or sodium hexametaphosphate; but is not limited thereto.

[0052] In one aspect of the embodiment of the present disclosure, the leveling agent is selected from leveling agent BYK-333 or silicone leveling agent HY-5030, but is not limited thereto.

[0053] In one aspect of the embodiments of the present disclosure, the substrate wetting agent is selected from one or more of sodium alkylnaphthalene sulfonate, castor oil sulfate, sodium dodecyl sulfate, lauryl sulfate, alkylphenol polyoxyethylene ether, alkyl alcohol polyoxyethylene ether, ethylene glycol polyoxyethylene alkyl ester, ethylene glycol polyoxyethylene alkyl aromatic ether, and acetylene glycol; but is not limited thereto.

[0054] In one aspect of the embodiments of the present disclosure, the surface tension aid is selected from polysiloxane-polyalkoxy polyether copolymers; but is not limited thereto.

[0055] In one aspect of the embodiments of the present disclosure, the light stabilizer is selected from one or more of ultraviolet absorber UV-O, ultraviolet absorber UV-9, ultraviolet absorber UV-531, ultraviolet absorber UVP-327, light stabilizer GW-540, and light stabilizer 744; but is not limited thereto.

[0056] In one aspect of the embodiments of the present disclosure, the anti-settling agent is selected from any one of hydroxyethyl cellulose, modified polyurea compounds, fumed silica, and organic bentonite substances; but is not limited thereto.

[0057] In one aspect of the embodiments of the present disclosure, the antioxidant is selected from one or more of antioxidant 1010, 2,6-di-tert-butyl-4-methylphenol, bis(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide, and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; but is not limited thereto.

[0058] In one aspect of the embodiments of the present disclosure, in addition to the aforementioned components, the remaining components in the modified polyurethane are solvents; the solvent is selected from one or more of ethyl acetate, propylene glycol methyl ether acetate, butyl acetate, xylene, and trimethylbenzene; but is not limited thereto.

[0059] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0060] It can be seen from the above embodiments that the architectural waterproof coating provided by the present disclosure not only has good hydrophobicity, but also has good high toughness and high adhesion.

[0061] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The relevant embodiments described herein are illustrative and are used to provide a basic understanding of the present application. The embodiments of the present application should not be interpreted as limiting the present application.

[0063] For simplicity, only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and any upper limit can be combined with any other upper limit to form an unspecified range. In addition, each separately disclosed point or single value can itself be combined as a lower limit or upper limit with any other point or single value or with other lower limits or upper limits to form an unspecified range.

[0064] In this article, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0065] In the description herein, unless otherwise specified, “above” and “below” include the number.

[0066] Unless otherwise specified, the terms used in this disclosure have the well-known meanings commonly understood by those skilled in the art. Unless otherwise specified, the numerical values ​​of the various parameters mentioned in this disclosure can be measured using various measurement methods commonly used in the art (for example, they can be tested according to the methods given in the embodiments of this disclosure).

[0067] The term "about" is used to describe and illustrate small changes. When used in conjunction with an event or situation, the term may refer to an example in which the event or situation occurs precisely and an example in which the event or situation occurs very approximately. For example, when used in conjunction with a numerical value, the term may refer to a range of variation of less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. In addition, amounts, ratios, and other numerical values ​​are sometimes presented in this article in a range format. It should be understood that such a range format is for convenience and simplicity, and should be flexibly understood to include not only numerical values ​​explicitly designated as range limits, but also all individual numerical values ​​or subranges encompassed within the range, as if each numerical value and subrange were explicitly designated.

[0068] A list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single component or multiple components. Item B may contain a single component or multiple components. Item C may contain a single component or multiple components.

[0069] In this disclosure, the term "alkyl" refers to an aliphatic hydrocarbon group, which can be straight or branched. Branched refers to one or more lower alkyl groups, such as methyl, ethyl or propyl, attached to a linear alkyl chain. "Lower alkyl" refers to a group containing about 1 to about 6 carbon atoms in the chain, which can be straight or branched.

[0070] In this disclosure, the term "alkenyl" refers to an aliphatic hydrocarbon group containing at least one carbon-carbon double bond, which can be straight or branched. Branched refers to one or more lower alkyl groups, such as methyl, ethyl or propyl, attached to a linear alkenyl chain. "Lower alkenyl" refers to a group containing about 2 to about 6 carbon atoms in the chain, which can be straight or branched.

[0071] In the present disclosure, the term "alkynyl" refers to an aliphatic hydrocarbon group containing at least one carbon-carbon triple bond, which can be straight or branched. Branched refers to one or more lower alkyl groups, such as methyl, ethyl or propyl, attached to a linear alkynyl chain. "Lower alkynyl" refers to containing about 2 to about 6 carbon atoms in the chain, which can be straight or branched. Non-limiting examples of alkynyl include ethynyl, propynyl, 2-butynyl, 3-methylbutynyl, n-pentynyl and decynyl.

[0072] In the present disclosure, the term "amino" refers to a -NR'R" group. The amino group may be optionally substituted. In an unsubstituted amino group, R' and R" are hydrogen. In a substituted amino group, R' and R" may each independently be, but are not limited to, hydrogen, alkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, alkylcycloalkyl, alkylheterocycloalkyl, alkoxy, sulfonyl, alkenyl, alkanoyl, aryl, arylalkyl or heteroaryl, provided that R' and R" are not both hydrogen. In a substituted amino group, R' and R" may be cyclized to form a cyclic amino group, such as a pyrrolidinyl or piperidinyl group. Such cyclic amino groups may incorporate other heteroatoms, for example to form piperazine or morpholine groups. Such cyclic amino groups may be optionally substituted, for example, by amino, hydroxyl or oxo groups.

[0073] In the present disclosure, the term "alkoxy" refers to -O-alkyl. Alkoxy can refer to a straight chain, branched or cyclic, saturated or unsaturated oxy-hydrocarbon chain, including, for example, methoxy, ethoxy, propoxy, isopropoxy, butoxy, tert-butoxy and pentoxy. Alkoxy can be optionally substituted with one or more alkoxy substituents ("substituted alkoxy").

[0074] In this disclosure, the term "aryl" refers to an aromatic monocyclic or polycyclic ring system. The aryl group may be optionally substituted with one or more "ring system substituents", which may be the same or different, and are as defined herein. Non-limiting examples of suitable aryl groups include phenyl and naphthyl.

[0075] In the present disclosure, the term "heteroaryl" refers to an aromatic monocyclic or polycyclic ring system in which one or more of the ring atoms is an element other than carbon, such as nitrogen, oxygen or sulfur, either alone or in combination, with preferred heteroaryls containing about 5 to about 6 ring atoms. The "heteroaryl" may be optionally substituted with one or more "ring system substituents", which may be the same or different, as defined herein. The prefix aza, oxa or thia before the heteroaryl root name indicates that at least one nitrogen, oxygen or sulfur atom, respectively, is present as a ring atom. The nitrogen atom of the heteroaryl may be optionally oxidized to the corresponding N-oxide. Non-limiting examples of suitable heteroaryl groups include pyridinyl, pyrazinyl, furanyl, thiophenyl, pyrimidinyl, isoxazolyl, isothiazolyl, oxazolyl, thiazolyl, pyrazolyl, furazanyl, pyrrolyl, pyrazolyl, triazolyl, 1,2,4-thiadiazolyl, pyrazinyl, pyridazinyl, quinoxalinyl, 2,3-naphthyridinyl, imidazo[1,2-a]pyridinyl, imidazo[2,1-b]thiazolyl, benzofurazanyl, indolyl, azaindolyl, benzimidazolyl, benzothiophenyl, quinolinyl, imidazolyl, thienopyridinyl, quinazolinyl, thienopyrimidinyl, pyrrolopyridinyl, imidazopyridinyl, isoquinolinyl, benzazaindolyl, 1,2,4-triazinyl, benzothiazolyl, and the like.

[0076] The present invention is further described below by way of specific examples. The various chemical reagents used in the examples of the present invention are obtained through conventional commercial channels unless otherwise specified. Unless otherwise specified, the contents described below are all weight contents. Unless otherwise specified, it is understood that the process is carried out at room temperature.

[0077] Example

[0078] Embodiment 1:

[0079] Embodiment 1 comprises the following steps:

[0080] A: Preparation of Compounds of Formula II

[0081] Step A-1:

[0082]

[0083] Take a three-necked flask, add 10 mL of fuming nitric acid, cool to -5 °C, slowly add 5 g of raw material 1-1, keep the temperature for 2 h; pour the reaction solution into 300 mL of saturated NaCl solution, extract with ether three times, spin dry to obtain a brown solid. Recrystallize with ethanol to obtain 4.52 g of white crystal intermediate 1-1, with a yield of 75%. 1H NMR (500MHz, CDCl3) δ8.60(d,J=8.8Hz,2H),8.24(d,J=8.6Hz,2H),7.76(ddd,J=8.2,7.0,0.9Hz,2H),7.69(d,J=8.5Hz,2H),7.42(ddd,J =8.2, 7.0, 0.9Hz, 2H), 7.35 (d, J = 8.6Hz, 2H); 19FNMR (282MHz, CDCl3) δ -127.48, -128.28, -129.37, -129.38, -130.17, -130.18, -130.95.

[0084] Step A-2:

[0085]

[0086] At 25°C, add 2 g of intermediate 1-1 to 10 mL of ethyl acetate, add 0.2 g of Pd / C, introduce H2, and evacuate the air 3 times to fill the flask with hydrogen. Maintain the reaction at 25°C for 24 h, and then stop the reaction. Dry the solvent, separate by column chromatography directly, and then elute with EA / PE mixed solvent to obtain 1.63 g of intermediate 1-2 as an oily liquid, with a yield of 92%. 1HNMR (500MHz, CDCl3) δ8.11–8.06(m,1H),7.70(d,J=8.8Hz,1H),7.48(d,J=6.8Hz,3H),6.55(d,J=8.4Hz,1H); 13C NMR (126MHz, CDCl3) δ141.83,139.96,126.55,126.25,125.93,124.49,122.06,121.23,112.49,108.34.

[0087] Step A-3:

[0088]

[0089] At 0°C, add 30g of intermediate 1-2 to 200mL CH2Cl2, then add 12g of triphosgene and 2g of DMAP in sequence, react for 30min under stirring, then heat to 25°C and react for 2h. Stop the reaction, spin dry, and distill under reduced pressure to obtain the product, which is the prepared compound 2-1, totaling 20.61g, with a yield of 62%. :1H NMR (500MHz, CDCl3) δ8.35(d,J=8.7Hz,2H),8.24(d,J=8.5Hz,2H),7.71(ddd,J=8.1,7.2,0.9Hz,2H), 7.59 (d, J=8.5Hz, 2H), 7.52 (ddd, J=8.1, 7.0, 0.9Hz, 2H), 7.46 (d, J=8.6Hz, 2H); 19FNMR (282MHz, CDCl 3) δ-127.58,-128.27,-129.57,-129.36,-130.19,-130.28,-130.85.

[0090] B: Preparation of modified polyurethane

[0091] Equimolar amounts of compound 2-1 (compound of formula II), OHCH2CH2CH2CH2OH (compound of formula III), (4,4,5,5,6,6,6-heptafluorohexane-1,2-diol, compound of formula IV) and (naphthalene diisocyanate, compound of formula V) was added into 50 mL of dimethyl sulfoxide, and stirred continuously. Bismuth neodecanoate was used as a catalyst, and the mixture was reacted at 75° C. for 2 h. After purification, the modified polyurethane of Example 1 was obtained.

[0092] C: Preparation of the waterproof coating of Example 1:

[0093] 30 parts by weight of the modified polyurethane of Example 1, 5 parts by weight of tetrafluorobutanol, 8 parts by weight of 1,4-butanediol, 10 parts by weight of dibutyl phthalate, 3 parts by weight of polytetramethylene glycol, 1 part by weight of silicone leveling agent HY-5030, 1 part by weight of sodium dodecyl sulfate, 1 part by weight of light stabilizer GW-540, 1 part by weight of bis(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide and 40 parts by weight of butyl acetate are mixed uniformly to obtain the waterproof coating of Example 1.

[0094] Embodiment 2:

[0095] The steps of Example 2 are the same as those of Example 1, except that

[0096] replace

[0097] Embodiment 3:

[0098] The steps of Example 3 are the same as those of Example 1, except that

[0099] replace

[0100] Embodiment 4:

[0101] The steps of Example 4 are the same as those of Example 1, except that

[0102] replace

[0103] Embodiment 5:

[0104] The steps of Example 5 are the same as those of Example 1, except that

[0105] replace

[0106] Embodiment 6:

[0107] The steps of Example 6 are the same as those of Example 1, except that OHCH2CH2-O-CH2CH2OH is used instead of OHCH2CH2CH2CH2OH.

[0108] Embodiment 7:

[0109] The steps of Example 7 are the same as those of Example 1, except that OHCH2CH2CH2CH2CH2CH2OH is used instead of OHCH2CH2CH2CH2OH.

[0110] Embodiment 8:

[0111] The steps of Example 8 are the same as those of Example 1, except that OHCH2CH2CH2OH is used instead of OHCH2CH2CH2CH2OH.

[0112] Comparative Example 1:

[0113] The steps of Comparative Example 1 are the same as those of Example 1, except that 4,4,5,5,6,6,6-heptafluorohexane-1,2-diol is not used, but a 2-fold molar amount of OHCH2CH2CH2CH2OH is used.

[0114] Comparative Example 2:

[0115] The steps of Comparative Example 2 are the same as those of Example 1, except that OHCH2CH2CH2CH2OH is not used, but a 2-fold molar amount of 4,4,5,5,6,6,6-heptafluorohexane-1,2-diol is used.

[0116] Hydrophobic performance test:

[0117] Contact angle test: The surface wettability of the samples of Examples 1-8 and Comparative Examples 1-2 was tested using a contact angle meter (OCA 25, Dataphysics GmbH, Germany). The contact angle (CA) and sliding angle (SA) of the samples were tested with 5 μL of deionized water, and the average value was taken after testing at 5 different positions.

[0118] Contact angle test after self-repair: The samples of Examples 1-8 and Comparative Examples 1-2 were contacted with 800 mesh, 1000 mesh, and 1200 mesh sandpaper, respectively. A 100g weight was placed on the sample, and it was pushed back and forth horizontally along a straight line for 10 cm each (20 cm in total) as one friction cycle. After 10 friction cycles, the surface wettability of the sample was tested with a contact angle meter (OCA 25, Dataphysics GmbH, Germany) after being placed for 1 month. The contact angle (CA) and rolling angle (SA) of the coating were tested with 5 μL of deionized water, and the average value was taken after testing at 5 different positions. The contact angle test results of the coating and the contact angle after self-repair are shown in Table 1 below:

[0119] Table 1

[0120]

[0121]

[0122] The samples of Examples 1-8 and Comparative Examples 1-2 were tested according to the relevant standards in JG / T 242018 "Synthetic Resin Sand Wall Architectural Coatings". The test results are shown in Table 2 below:

[0123]

[0124]

[0125] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure.

Claims

1. A high-toughness and high-adhesion modified polyurethane building waterproof coating, characterized in that: The building waterproof coating comprises modified polyurethane, fluorocarbon alcohol, chain extender, plasticizer and solvent, and the modified polyurethane has the following structural formula: in, R1 is selected from wherein Ar1 and Ar2 are each independently selected from C5-C12 aryl or C4-C10 heteroaryl; R2 is selected from *-R 21 -*; where R 21 Selected from C1-C10 alkyl or C1-C10 alkoxy; the C1-C10 alkyl or C1-C10 alkoxy is optionally substituted by one or more C2-5 alkenyl, C2-5 alkynyl, amino; R3 is selected from *-R 31 -*; where R 31 Selected from C3-C15 alkyl substituted with one or more fluorine atoms; R4 is selected from 2. The architectural waterproof coating according to claim 1, characterized in that: R 21 Choose from -CH2CH2-, -CH2CH2CH2-, -CH2CH2CH2CH2-, -CH2CH2CH2CH2CH2-, -CH2CH2CH2CH2CH2CH2-, -CH2CH2CH2CH2CH2CH2-, -CH2CH2-O-CH2CH2-.

3. The architectural waterproof coating according to claim 1, characterized in that: R 31 Selected from 4. The architectural waterproof coating according to claim 1, characterized in that: R4 is selected from 5. The architectural waterproof coating according to claim 1, characterized in that: Ar1 and Ar2 are each independently selected from 6. The architectural waterproof coating according to any one of claims 1 to 5, characterized in that: The modified polyurethane is prepared by the following steps: Add the compound of formula II, the compound of formula III, the compound of formula IV and the compound of formula V to an organic solvent, keep stirring, use bismuth neodecanoate as a catalyst, react at 70° C.-80° C. for 1.5-2.5 hours to obtain the modified polyurethane; The structural formulas of the compound of formula II, the compound of formula III, the compound of formula IV and the compound of formula V are as follows:

7. The architectural waterproof coating according to any one of claims 1 to 5, characterized in that: Based on the total mass of the building waterproof coating, the mass percentage of the modified polyurethane is selected from 25%-35%.

8. The architectural waterproof coating according to claim 1, characterized in that: Based on the total mass of the building waterproof coating, the mass percentage of the fluorocarbon alcohol is selected from 2%-8%; and the fluorocarbon alcohol is selected from any one of trifluoroethanol, trifluoropropanol, tetrafluoropropanol, pentafluoropropanol, trifluorobutanol, tetrafluorobutanol, pentafluorobutanol, hexafluorobutanol, heptafluorobutanol, trifluoropentanol, tetrafluoropentanol, pentafluoropentanol, hexafluoropentanol, heptafluoropentanol, octafluoropentanol, nonafluoropentanol, trifluorohexanol, tetrafluorohexanol, pentafluorohexanol, hexafluorohexanol, heptafluorohexanol, octafluorohexanol, nonafluorohexanol, decafluorohexanol and undecafluorohexanol.

9. The architectural waterproof coating according to claim 1, characterized in that: Based on the total mass of the building waterproof coating, the mass percentage of the chain extender is selected from 5%-10%; and the chain extender is selected from one or more of trimethylolpropane, ethylene glycol, propylene glycol, and 1,4-butanediol.

10. The architectural waterproof coating according to claim 1, characterized in that: Based on the total mass of the building waterproof coating, the mass percentage of the plasticizer is selected from 5%-15%; and the plasticizer is selected from one or more of chlorinated paraffin, dibutyl phthalate, tributyl citrate, acetyl tributyl citrate, and epoxy soybean oil.

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