CN113416445A - Preparation method and application of modified silica sol for siloxane wood varnish - Google Patents
Preparation method and application of modified silica sol for siloxane wood varnish Download PDFInfo
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- CN113416445A CN113416445A CN202110799430.4A CN202110799430A CN113416445A CN 113416445 A CN113416445 A CN 113416445A CN 202110799430 A CN202110799430 A CN 202110799430A CN 113416445 A CN113416445 A CN 113416445A
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- China
- Prior art keywords
- siloxane
- silica sol
- modified silica
- preparation
- varnish
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- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000002966 varnish Substances 0.000 title claims abstract description 45
- 239000002023 wood Substances 0.000 title claims abstract description 44
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000000178 monomer Substances 0.000 claims description 18
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 14
- 238000006460 hydrolysis reaction Methods 0.000 claims description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 239000003377 acid catalyst Substances 0.000 claims description 7
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- CPLASELWOOUNGW-UHFFFAOYSA-N benzyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)CC1=CC=CC=C1 CPLASELWOOUNGW-UHFFFAOYSA-N 0.000 claims description 3
- ZZNQQQWFKKTOSD-UHFFFAOYSA-N diethoxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](OCC)(OCC)C1=CC=CC=C1 ZZNQQQWFKKTOSD-UHFFFAOYSA-N 0.000 claims description 3
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 claims description 3
- AHUXYBVKTIBBJW-UHFFFAOYSA-N dimethoxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](OC)(OC)C1=CC=CC=C1 AHUXYBVKTIBBJW-UHFFFAOYSA-N 0.000 claims description 3
- YYLGKUPAFFKGRQ-UHFFFAOYSA-N dimethyldiethoxysilane Chemical compound CCO[Si](C)(C)OCC YYLGKUPAFFKGRQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 3
- -1 polysiloxane Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 3
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 claims description 3
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 239000003973 paint Substances 0.000 description 10
- 230000007547 defect Effects 0.000 description 7
- 239000004922 lacquer Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000012948 isocyanate Substances 0.000 description 5
- 150000002513 isocyanates Chemical class 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- XLJMAIOERFSOGZ-UHFFFAOYSA-N anhydrous cyanic acid Natural products OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 3
- 239000012224 working solution Substances 0.000 description 3
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 description 2
- 239000001263 FEMA 3042 Substances 0.000 description 2
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 2
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 2
- 229940033123 tannic acid Drugs 0.000 description 2
- 235000015523 tannic acid Nutrition 0.000 description 2
- 229920002258 tannic acid Polymers 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 241000047703 Nonion Species 0.000 description 1
- 239000004972 Polyurethane varnish Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 210000004905 finger nail Anatomy 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 230000002087 whitening effect Effects 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
- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The application discloses a preparation method and application of modified silica sol for siloxane wood varnish.
Description
Technical Field
The invention belongs to the technical field of water-based siloxane resin reinforcing materials, and particularly relates to a preparation method and application of modified silica sol for siloxane wood varnish.
Background
The water-based paint is an important means for reducing PM2.5 due to greenhouse effect, the consumption of the wood lacquer in 2019 all the year around is 170 ten thousand tons, wherein the proportion of the water-based wood lacquer is less than 10%, the average Volatile Organic Compounds (VOC) per ton of 90% solvent wood lacquer accounts for 50-60%, and 80 ten thousand tons of volatile organic compounds are discharged to the atmosphere in the year. Such serious pollution is highly appreciated by the countries, and regulations gradually limit the amount of VOC emissions, and politically encourages support for the progress of coating wateriness. The water-based work of the wood paint is vigorously developed by various domestic paint factories. The traditional oily wood lacquer obtains long-term market recognition by the characteristics of high fullness, high hardness, quick drying and low cost, and the waterborne wood lacquer can be recognized by the market only by achieving the appearance effect of solvent type products, so that the waterborne wood lacquer can be truly replaced, and the waterborne wood lacquer is favored by wide consumers.
The water-borne wood varnish which is commercialized at present comprises water-borne two-component polyurethane varnish consisting of a polyurethane curing agent and a hydroxyl polymer, and single-component varnish consisting of acrylic emulsion and isocyanate dispersion. The water-based two-component polyurethane has the advantages that the comprehensive performance is more acceptable by the market, the appearance effect and the hardness are not inferior to those of a solvent type polyurethane, and the defects of low construction solid content, long curing time, limited organic matters and free isocyanic acid are overcome. The acrylic emulsion and the isocyanate dispersion can not be a substitute of high-grade wood varnish in the true sense on the whole, and have a certain distance in hardness, gloss and medium resistance. The product of the invention is added into a double-curing siloxane waterborne wood varnish, and has the effects of increasing curing property, improving construction solid content, wetting wood surface and blocking the rib expansion phenomenon caused by tannic acid in a system. The wood varnish is a dual-component water-based wood varnish, the organic volatile content of the product is low, the construction is carried out with high solid content, and the varnish film has high gloss, high hardness, good visualization and clearness; the harmful substance is zero, and the paint does not contain isocyanate component, formaldehyde, metal catalyst and free isocyanic acid radical; the product is quick to dry and short in curing period, and can be used after 48 hours. Is a waterborne product of woodenware varnish and home decoration materials.
The wood has wide application and various textures, so that the coating has high demand and high performance requirement. Wood aspects include softwood, hardwood; the wood materials have different strength, texture, grease and water absorption, and coating defects such as rib expansion, light loss, whitening, oil return, collapse, cracking and the like are often caused. Because water has extremely strong wettability to wood, the defects of the coating films are further amplified in the process of adopting the water-based wood paint, and the technical difficulty of water-based wood paint is increased. The water-based paint is usually realized by changing the state of the paint and changing the polarity of the paint. The state comprises a water-soluble type, an emulsion type, a suspension type or a mixture of the three types; the polarity includes anion, cation, and non-ion. These water-based methods are more or less limited for wood, and defects such as swelling, oil returning, and collapse occur more frequently.
Disclosure of Invention
The technical problem to be solved is as follows: the application mainly provides a preparation method and application of modified silica sol for siloxane woodware varnish, and solves the technical problems of low construction solid content, long curing time, limited organic matter content, free isocyanic acid and the like in the prior art. The technical scheme is as follows:
a preparation method of modified silica sol for siloxane woodenware varnish comprises the following steps:
the first step is as follows: adding a binary siloxane monomer and a ternary siloxane monomer into silica sol with the pH value of 3-7 at room temperature or at the temperature of 40-80 ℃;
the second step is that: the hydrolysis reaction is carried out under the condition of adding acid catalyst or not adding catalyst to generate stable modified silica sol liquid.
As a preferred technical scheme of the invention: the content of the silicon dioxide in the silicon dioxide sol is between 20 and 45 percent.
As a preferred technical scheme of the invention: the solvent in the silicon dioxide sol is water and/or alcohol ether solvent.
As a preferred technical scheme of the invention: the binary siloxane monomer and the ternary siloxane monomer are one or more of methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, dimethyldimethoxysilane, diphenyldimethoxysilane, dimethyldiethoxysilane, diphenyldiethoxysilane and benzyltriethoxysilane.
As a preferred technical scheme of the invention: the proportion of the effective components in the silicon dioxide is 20-60%, and the binary and ternary siloxane monomers account for 40-80% of the total amount of the silicon dioxide sol and the binary and ternary siloxane monomers.
As a preferred technical scheme of the invention: the reaction conditions of the hydrolysis reaction in the second step are specifically room temperature conditions or constant temperature reaction within the temperature range of 25-81 ℃, and the hydrolysis reaction in the second step is more than 4 hours.
As a preferred technical scheme of the invention: and in the second step, after hydrolysis reaction for 4 hours, removing the methanol solvent at the temperature of between 80 and 85 ℃.
As a preferred technical scheme of the invention: the dosage range of the acidic catalyst is 0-0.5% of the total amount of the substances; the acid catalyst is one or a combination of formic acid, acetic acid, hydrochloric acid and phosphoric acid with pure concentration or 10 to 40 percent diluted by water.
The invention also discloses application of the modified silica sol for siloxane wood varnish prepared by the preparation method in wood varnish.
As a preferred technical scheme of the invention: the application of the modified silica sol for siloxane wood varnish in the wood varnish is as follows: adding 25-30 parts of polysiloxane containing glycidyl ether, 5-10 parts of reactive diluent and 10-15 parts of propylene glycol methyl ether into 10-20 parts of modified silica sol for siloxane wood varnish according to the mass part ratio, and uniformly mixing.
Has the advantages that: compared with the prior art, the preparation method of the modified silica sol for siloxane wood varnish has the following technical effects:
1. the organic volatile amount is low, the solid content is high, the varnish film has high gloss, high hardness, good visualization and clearness; the harmful substance is zero, and the paint does not contain isocyanate component, formaldehyde, metal catalyst and free isocyanic acid radical; the product is quick to dry and short in curing period, and can be used after 48 hours. Is a waterborne product of woodenware varnish and home decoration materials.
2. The curing property is increased, the construction solid content is improved, the surface of the wood is wetted, and the rib expansion phenomenon caused by tannic acid is prevented; the coating film overcomes the defect that the currently commonly adopted single-component Polyurethane (PUD) cannot form high definition.
3. The varnish is composed of a three-layer coating structure of color wiping, back sealing and finishing, and can be independently used or matched with any one according to the actual use condition.
4. The clarity and the light transmittance of the coating film can be improved by 2 percent, and the stereoscopic impression of wood textures is enhanced; the coating overcomes the hidden environmental-friendly defects that the currently commonly adopted waterborne double-component polyurethane woodenware varnish contains free isocyanate, contains a metal catalyst and a ketone solvent.
5. The coating film has high hardness, and can reach 3H pencil hardness on hardwood; the surface tension of the coating film is low, and the coating film has a self-cleaning function; the coating overcomes the defects of easy stain, low hardness and low construction solid content of the woodware varnish prepared from the water-soluble acrylic resin or acrylic emulsion.
6. The product can be used as color spreading carrier resin of a color wiping agent, and is suitable for decoration requirements of wood, metal, glass, stone, fingernails and partial plastic surfaces.
Detailed Description
Example 1
A preparation method of modified silica sol for siloxane woodenware varnish comprises the following steps:
the first step is as follows: adding a binary siloxane monomer and a ternary siloxane monomer into silica sol with the pH value of 3-7 at room temperature or at the temperature of 40-80 ℃;
the second step is that: the hydrolysis reaction is carried out under the condition of adding acid catalyst or not adding catalyst to generate stable modified silica sol liquid.
The content of the silicon dioxide in the silicon dioxide sol is between 20 and 45 percent.
The solvent in the silicon dioxide sol is water and/or alcohol ether solvent.
The binary siloxane monomer and the ternary siloxane monomer are one or more of methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, dimethyldimethoxysilane, diphenyldimethoxysilane, dimethyldiethoxysilane, diphenyldiethoxysilane and benzyltriethoxysilane.
The proportion of the effective components in the silicon dioxide is 20-60%, and the binary and ternary siloxane monomers account for 40-80% of the total amount of the silicon dioxide sol and the binary and ternary siloxane monomers.
The reaction conditions of the hydrolysis reaction in the second step are specifically room temperature conditions or constant temperature reaction within the temperature range of 25-81 ℃; the hydrolysis reaction in the second step is more than 4 hours, and the methanol solvent is removed at 80-85 ℃ after the hydrolysis reaction in the second step is 4 hours; the dosage range of the acidic catalyst is 0-0.5% of the total amount of the substances. The acid catalyst is one or a combination of formic acid, acetic acid, hydrochloric acid and phosphoric acid with pure concentration or 10 to 40 percent diluted by water.
The application of the modified silica sol for siloxane wood varnish in the wood varnish is as follows: a component of the double-component wood varnish:
| name of Material | Specification of | Compounding amount |
| Cationic aqueous siloxane oligomers | 45-55％ | 20-30 |
| Formic acid | 20-40％ | 3-5 |
| Defoaming agent | 80％ | 0.1-0.2 |
| Wetting agent | 100％ | 0.1-0.2 |
| Ethanol | Industrial grade | 2-5 |
| Deionized water | Industrial grade | 15-30 |
| Total up to | 35-50％ |
Weighing 20-30 parts of cationic waterborne siloxane oligomer, 3-5 parts of acid catalyst, 0.1-0.2 part of defoaming agent, 0.1-0.2 part of wetting agent, 2-5 parts of alcohol ether solvent and 15-30 parts of deionized water according to the mass part ratio, and uniformly mixing;
component B of double-component woodenware varnish
Adding 25-30 parts of polysiloxane containing glycidyl ether, 5-10 parts of reactive diluent and 10-15 parts of propylene glycol methyl ether into 10-20 parts of modified silica sol for siloxane wood varnish according to the mass part ratio, and uniformly mixing. And adding the component B into the component A, stirring for 5-10 minutes to prepare working solution, filtering the working solution, and stirring and curing the filtered working solution for 30 minutes to obtain the bi-component wood varnish.
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 present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A preparation method of modified silica sol for siloxane woodenware varnish is characterized by comprising the following steps:
the first step is as follows: adding a binary siloxane monomer and a ternary siloxane monomer into silica sol with the pH value of 3-7 at room temperature or at the temperature of 40-80 ℃;
the second step is that: the hydrolysis reaction is carried out under the condition of adding acid catalyst or not adding catalyst to generate stable modified silica sol liquid.
2. The preparation method of the modified silica sol for siloxane woodenware varnish according to claim 1, characterized in that: the content of the silicon dioxide in the silicon dioxide sol is between 20 and 45 percent.
3. The preparation method of the modified silica sol for siloxane woodenware varnish according to claim 1, characterized in that: the solvent in the silicon dioxide sol is water and/or alcohol ether solvent.
4. The preparation method of the modified silica sol for siloxane woodenware varnish according to claim 1, characterized in that: the binary siloxane monomer and the ternary siloxane monomer are one or more of methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, dimethyldimethoxysilane, diphenyldimethoxysilane, dimethyldiethoxysilane, diphenyldiethoxysilane and benzyltriethoxysilane.
5. The preparation method of the modified silica sol for siloxane woodenware varnish as claimed in claim 2, wherein: the proportion of the effective components in the silicon dioxide is 20-60%, and the binary and ternary siloxane monomers account for 40-80% of the total amount of the silicon dioxide sol and the binary and ternary siloxane monomers.
6. The preparation method of the modified silica sol for siloxane woodenware varnish according to claim 1, characterized in that: the reaction conditions of the hydrolysis reaction in the second step are specifically room temperature conditions or constant temperature reaction within the temperature range of 25-81 ℃, and the hydrolysis reaction in the second step is more than 4 hours.
7. The preparation method of the modified silica sol for siloxane woodenware varnish according to claim 6, wherein the modified silica sol comprises the following components: and in the second step, after hydrolysis reaction for 4 hours, removing the methanol solvent at the temperature of between 80 and 85 ℃.
8. The preparation method of the modified silica sol for siloxane woodenware varnish according to claim 1, characterized in that: the dosage range of the acidic catalyst is 0-0.5% of the total amount of the substances; the acid catalyst is one or a combination of formic acid, acetic acid, hydrochloric acid and phosphoric acid with pure concentration or 10 to 40 percent diluted by water.
9. The use of the modified silica sol for siloxane wood varnish prepared by the preparation method of any one of claims 1 to 8 in wood varnish.
10. The use according to claim 9, wherein the modified silica sol for siloxane wood varnish is used in wood varnish as follows: adding 25-30 parts of polysiloxane containing glycidyl ether, 5-10 parts of reactive diluent and 10-15 parts of propylene glycol methyl ether into 10-20 parts of modified silica sol for siloxane wood varnish according to the mass part ratio, and uniformly mixing.
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| AU2020102971A4 (en) * | 2020-10-23 | 2020-12-24 | Qingdao University Of Science And Technology | A Composite Coating Material of Siloxane Modified Silica Sol and Preparation Method Thereof |
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| US6265029B1 (en) * | 1995-05-04 | 2001-07-24 | William Lewis | Low-cost, user-friendly hardcoating solution, process and coating |
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