CN110982415A - Silane modified anti-settling polyurethane waterproof coating and preparation method thereof - Google Patents
Silane modified anti-settling polyurethane waterproof coating and preparation method thereof Download PDFInfo
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- CN110982415A CN110982415A CN201911322179.1A CN201911322179A CN110982415A CN 110982415 A CN110982415 A CN 110982415A CN 201911322179 A CN201911322179 A CN 201911322179A CN 110982415 A CN110982415 A CN 110982415A
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- 238000000576 coating method Methods 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 title claims abstract description 37
- 239000004814 polyurethane Substances 0.000 title claims abstract description 20
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 20
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910000077 silane Inorganic materials 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims description 12
- 239000000945 filler Substances 0.000 claims abstract description 28
- 239000003707 silyl modified polymer Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000004611 light stabiliser Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 61
- 239000000377 silicon dioxide Substances 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- RKMGAJGJIURJSJ-UHFFFAOYSA-N 2,2,6,6-tetramethylpiperidine Chemical group CC1(C)CCCC(C)(C)N1 RKMGAJGJIURJSJ-UHFFFAOYSA-N 0.000 claims description 8
- 125000004803 chlorobenzyl group Chemical group 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical group [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- LEHNQGSPRXHYRT-UHFFFAOYSA-N 2-dodecyl-1h-imidazole Chemical compound CCCCCCCCCCCCC1=NC=CN1 LEHNQGSPRXHYRT-UHFFFAOYSA-N 0.000 claims description 5
- CQHJBQDGWRDUML-UHFFFAOYSA-N trichloro-[(4-chlorophenyl)methyl]silane Chemical compound ClC1=CC=C(C[Si](Cl)(Cl)Cl)C=C1 CQHJBQDGWRDUML-UHFFFAOYSA-N 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000002608 ionic liquid Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 235000019441 ethanol Nutrition 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000004432 silane-modified polyurethane Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910021485 fumed silica Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012974 tin catalyst Substances 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 1
- NOKSMMGULAYSTD-UHFFFAOYSA-N [SiH4].N=C=O Chemical compound [SiH4].N=C=O NOKSMMGULAYSTD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000013008 moisture curing Methods 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004526 silane-modified polyether Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/83—Chemically modified polymers
- C08G18/837—Chemically modified polymers by silicon containing compounds
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
Abstract
The invention belongs to the technical field of coatings, and particularly relates to a silane modified anti-settling polyurethane waterproof coating which is characterized by comprising, by weight, α -60 parts of a silane modified polymer, 1-5 parts of a water removing agent, 30-60 parts of a filler, 1-5 parts of aminosilane and 0.5-3 parts of a light stabilizer.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a weather-resistant single-component polyurethane waterproof coating and a preparation method thereof
Background
Waterproof coatings are one of the important components of building functional materials. In building construction, the waterproof coating mainly forms a waterproof layer on the surface of a building so as to achieve the purposes of waterproofing and leakage resistance, and therefore, the performance and the selection of the waterproof coating are directly related to the using effect and the service life of the building. At present, the waterproof coating on the market is mainly a polyurethane waterproof coating, an acrylic waterproof coating, a JS waterproof coating and other products. The polyurethane waterproof coating has excellent mechanical property and good waterproof property, but has poor weather resistance, is easy to foam in construction in high-temperature and high-humidity environments, has high requirement on the drying degree of a base material, and may contain free isocyanate harmful to human bodies; the acrylic waterproof coating has good weather resistance and environmental protection, but the water resistance of the coating is poor, and the construction is difficult under low-temperature and high-humidity conditions; the JS waterproof paint is easy to bond with a wet base layer, is convenient to construct, and has the problem of difficult construction at low temperature. With the improvement of the quality of life, the requirement of people on environmental protection is higher and higher, so that the market needs a high-performance waterproof coating with low smell, no solvent and environmental protection.
The silane modified polymer is a novel high molecular material and is generally divided into two categories of silane modified polyether and silane modified polyurethane. The main chain of the polymer is macromolecular polyether or polyurethane prepolymer and is formed by end capping with isocyanate silane or amino silane, and the curing mechanism is moisture curing and generates a cross-linked network structure by reacting with external moisture. The adhesive or coating prepared based on the silane modified polymer resin has the comprehensive properties of organic silicon and polyurethane.
However, the existing formula system of the silane modified polyurethane modified waterproof coating contains 30-60% of calcium carbonate filler system, and the calcium carbonate filler system can be settled after being placed for a long time, so that the service life of the coating is influenced.
Disclosure of Invention
The calcium carbonate filler system can generate a sedimentation phenomenon after being placed for a long time, and the service life of the coating is influenced. The traditional anti-settling method is to add anti-settling agents such as fumed silica and the like, but the addition of the anti-settling agents reduces the mechanical property and the bonding strength and increases the agglomeration among fillers.
In order to solve the defects in the prior art, the invention provides a silane modified anti-settling polyurethane waterproof coating, which is characterized by comprising, by weight, 30-60 parts of α silane modified polymer, 1-5 parts of a water removing agent, 30-60 parts of a filler, 1-5 parts of aminosilane and 0.5-3 parts of a light stabilizer;
α the main chain of the silane modified polymer is soft polyether chain segment, both ends are connected with α silane containing isocyanate group, the concrete structure is as follows:
because α silane has electron-pushing group blocked by only one methylene, the crosslinking reaction speed is greatly increased, normal curing can be carried out without tin catalyst in general formula system, and the environmental protection performance is greatly improved.
The water removing agent is vinyl silane which can react with water quickly, so that the main resin is protected, and the storage stability of the coating is improved.
The aminosilane is alkaline and plays a role of a catalyst in a coating film curing reaction, so that an organic tin catalyst is not required to be additionally added.
The filler is amphiphilic silica particles, the particles are amphiphilic silica particles which are prepared by adopting silane coupling agent 4-chlorobenzyl trichlorosilane to carry out surface modification on the silica particles to prepare lipophilic silica particles with the surface grafted with chlorobenzyl, and then continuously grafting hydrophilic dodecyl imidazole on the surface. The lipophilic property of the silicon dioxide particles can ensure that the filler is better dissolved in a polymer matrix without sedimentation, and the modification of the ionic liquid group further improves the dispersibility of the particles, so that the particles are not agglomerated when used or kept for a long time, and the use effect and the coating uniformity are improved.
The light stabilizer is a derivative of 2, 2, 6, 6-tetramethyl piperidine, and the compound can better inhibit the photodegradation of a polymer.
The invention also provides a preparation method of the silane modified anti-settling polyurethane waterproof coating, which comprises the following steps:
(1) preparing an amphiphilic silica filler: uniformly mixing a certain amount of water, ethanol and ammonia water at room temperature, then adding ethyl orthosilicate, stirring and reacting for 8-10h at room temperature to obtain monodisperse silica particles, washing with deionized water to be neutral, and drying for later use; and then dispersing the prepared silicon dioxide particles and 4-chlorobenzyl trichlorosilane in toluene, carrying out ultrasonic treatment for 10-20min, stirring, refluxing and reacting for 24h, carrying out centrifugal separation, and washing with ethanol to obtain the silicon dioxide grafted with the chlorobenzyl group. Finally dispersing the obtained silicon dioxide grafted by the chlorobenzyl in acetonitrile, reacting with dodecyl imidazole for 24h under the reflux condition, centrifugally separating ethanol and washing to obtain the amphiphilic silicon dioxide filler
(2) The preparation of the waterproof coating comprises the steps of drying a reaction kettle, replacing the reaction kettle with nitrogen for three times, filling nitrogen for protection, sequentially adding α silane modified polymer, a water removing agent, a filler, aminosilane and a light stabilizer into the reaction kettle, performing ultrasonic dispersion for 30-50min, and then vacuumizing and defoaming to obtain the silane modified anti-settling polyurethane waterproof coating.
The invention has the advantages that the amphiphilic silica filler can be well dissolved in a polymer matrix without adding an anti-settling agent, and does not settle after being placed for a long time; the adopted filler contains ionic liquid groups, so that the filler has better dispersion characteristic and is not easy to agglomerate when in use; the amphiphilic silicon dioxide also contains dodecyl long-chain branches, so that a cured film of the amphiphilic silicon dioxide has better toughness, and no plasticizer is required to be added, thereby avoiding the migration of small molecules and further prolonging the service life.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The amphiphilic silica filler used in the embodiment of the invention is self-made in a laboratory, and the specific preparation route is as follows:
the preparation steps of the amphiphilic silica filler are as follows:
(1) 500g of water, 1250g of ethanol and 250g of ammonia were sequentially put into a 5L flask and stirred at room temperature for 30 min. Uniformly mixing, adding 150g of ethyl orthosilicate (used after reduced pressure distillation), stirring at room temperature for 8-10h, centrifugally washing with deionized water to neutrality, and freeze-drying to obtain monodisperse silica particles;
(2) dispersing 10g of dried silicon dioxide particles and 20g of 4-chlorobenzyl trichlorosilane in 1000g of toluene, performing ultrasonic dispersion for 20min, continuing stirring and refluxing for reaction for 24h, performing centrifugal separation, and washing for 3 times by using absolute ethyl alcohol to obtain the silicon dioxide grafted by the chlorobenzyl;
(3) dispersing 10g of chlorobenzyl grafted silica particles in 10mL of acetonitrile, adding 10g of dodecyl imidazole while stirring, carrying out reflux reaction at 80 ℃ for 24h, centrifugally separating a product after the reaction is finished, and washing the product for 5 times by using absolute ethyl alcohol to obtain the amphiphilic silica filler.
Example 1:
the embodiment provides a silane modified anti-settling polyurethane waterproof coating which is characterized by comprising, by weight, α parts of a silane modified polymer, 2 parts of vinyl silane, 30 parts of an amphiphilic silica filler, 1 part of aminosilane, and 1 part of a derivative of 2, 2, 6, 6-tetramethylpiperidine;
the preparation method of the silane modified anti-settling polyurethane waterproof coating comprises the steps of drying a 5L reaction kettle, replacing the reaction kettle with nitrogen for three times, filling nitrogen for protection, sequentially adding 350g of α silane modified polymer, 20g of vinyl silane, 300g of amphiphilic silica filler, 10g of aminosilane, 10g of 2, 2, 6, 6-tetramethylpiperidine derivative, performing ultrasonic dispersion for 40min, and vacuumizing and defoaming to obtain the silane modified anti-settling polyurethane waterproof coating.
Example 2:
the embodiment provides a silane modified anti-settling polyurethane waterproof coating which is characterized by comprising the following components, by weight, α parts of a silane modified polymer, 2 parts of vinyl silane, 35 parts of an amphiphilic silica filler, 2 parts of aminosilane, and 3 parts of a derivative of 2, 2, 6, 6-tetramethylpiperidine;
the preparation method is the same as example 1.
Example 3:
the embodiment provides a silane modified anti-settling polyurethane waterproof coating which is characterized by comprising 55 parts by weight of α silane modified polymer, 4 parts by weight of vinyl silane, 50 parts by weight of amphiphilic silica filler, 3 parts by weight of aminosilane and 3 parts by weight of 2, 2, 6, 6-tetramethylpiperidine derivative;
the preparation method is the same as example 1.
Comparative example:
the comparative example provides a silane modified polyurethane waterproof coating which comprises, by weight, α parts of silane modified polymer 55 parts, 3 parts of vinyl silane, 55 parts of calcium carbonate filler, 3 parts of aminosilane, and 3 parts of 2, 2, 6, 6-tetramethylpiperidine derivative;
firstly, drying a 5L reaction kettle, then replacing the reaction kettle with nitrogen for three times, filling nitrogen for protection, sequentially adding 550g of α silane modified polymer, 30g of vinyl silane, 550g of calcium carbonate filler, 20g of fumed silica, 30g of aminosilane, 30g of 2, 2, 6, 6-tetramethylpiperidine derivative, ultrasonically dispersing for 40min, and then vacuumizing and defoaming to obtain the silane modified anti-settling polyurethane waterproof coating.
TABLE 1 polyurethane Water-proofing coating Properties
As can be seen from the data, the coating modified by the invention has obvious effects on the aspects of sedimentation resistance and agglomeration.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A silane modified anti-settling polyurethane waterproof coating is characterized by comprising, by weight, α silane modified polymer 30-60 parts, a water removal agent 1-5 parts, a filler 30-60 parts, aminosilane 1-5 parts, and a light stabilizer 0.5-3 parts;
the α silane modified polymer has a main chain of a soft polyether chain segment, two ends of the main chain are connected with α silane containing isocyanate groups, and the specific structure is as follows:
the water removing agent is vinyl silane; the filler is amphiphilic silica particles, the particles are amphiphilic silica particles which are prepared by adopting silane coupling agent 4-chlorobenzyl trichlorosilane to carry out surface modification on the silica particles to prepare lipophilic silica particles with the surfaces grafted with chlorobenzyl, and then continuously grafting hydrophilic dodecyl imidazole on the surfaces to prepare the amphiphilic silica particles containing ionic liquid groups; the light stabilizer is a derivative of 2, 2, 6, 6-tetramethyl piperidine.
2. A preparation method of silane modified anti-settling polyurethane waterproof paint specifically comprises the following steps:
(1) preparing an amphiphilic silica filler: uniformly mixing a certain amount of water, ethanol and ammonia water at room temperature, then adding ethyl orthosilicate, stirring and reacting for 8-10h at room temperature to obtain monodisperse silica particles, washing with deionized water to be neutral, and drying for later use; then dispersing the prepared silicon dioxide particles and 4-chlorobenzyl trichlorosilane in toluene, carrying out ultrasonic treatment for 10-20min, stirring, refluxing and reacting for 24h, carrying out centrifugal separation, and washing with ethanol to obtain the silicon dioxide grafted with chlorobenzyl; finally, dispersing the obtained silicon dioxide grafted by the chlorobenzyl in acetonitrile, reacting with dodecyl imidazole for 24 hours under the reflux condition, and centrifugally separating ethanol and washing to obtain the amphiphilic silicon dioxide filler;
(2) the preparation of the waterproof coating comprises the steps of drying a reaction kettle, replacing the reaction kettle with nitrogen for three times, filling nitrogen for protection, sequentially adding α silane modified polymer, a water removing agent, a filler, aminosilane and a light stabilizer into the reaction kettle, performing ultrasonic dispersion for 30-50min, and then vacuumizing and defoaming to obtain the silane modified anti-settling polyurethane waterproof coating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911322179.1A CN110982415A (en) | 2019-12-20 | 2019-12-20 | Silane modified anti-settling polyurethane waterproof coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911322179.1A CN110982415A (en) | 2019-12-20 | 2019-12-20 | Silane modified anti-settling polyurethane waterproof coating and preparation method thereof |
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| CN110982415A true CN110982415A (en) | 2020-04-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010378A (en) * | 2022-06-06 | 2022-09-06 | 中国计量大学 | In-situ self-cleaning transparent film and preparation method thereof |
| CN115093779A (en) * | 2022-06-24 | 2022-09-23 | 广州集泰化工股份有限公司 | Solvent-free transparent waterproof coating and preparation method thereof |
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