CN115558341A - Hydrophobic coating for wood and preparation method and use method thereof - Google Patents
Hydrophobic coating for wood and preparation method and use method thereof Download PDFInfo
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- CN115558341A CN115558341A CN202211128466.0A CN202211128466A CN115558341A CN 115558341 A CN115558341 A CN 115558341A CN 202211128466 A CN202211128466 A CN 202211128466A CN 115558341 A CN115558341 A CN 115558341A
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- hemicellulose
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- 238000000576 coating method Methods 0.000 title claims abstract description 125
- 239000011248 coating agent Substances 0.000 title claims abstract description 119
- 239000002023 wood Substances 0.000 title claims abstract description 106
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229920002488 Hemicellulose Polymers 0.000 claims abstract description 148
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000002270 dispersing agent Substances 0.000 claims abstract description 65
- 239000002245 particle Substances 0.000 claims abstract description 42
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 25
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 150000008064 anhydrides Chemical class 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 12
- WVRNUXJQQFPNMN-VAWYXSNFSA-N 3-[(e)-dodec-1-enyl]oxolane-2,5-dione Chemical compound CCCCCCCCCC\C=C\C1CC(=O)OC1=O WVRNUXJQQFPNMN-VAWYXSNFSA-N 0.000 claims description 55
- 238000001035 drying Methods 0.000 claims description 19
- 239000002904 solvent Substances 0.000 claims description 19
- 239000003973 paint Substances 0.000 claims description 15
- 238000005886 esterification reaction Methods 0.000 claims description 13
- 239000003607 modifier Substances 0.000 claims description 13
- 230000004048 modification Effects 0.000 claims description 12
- 238000012986 modification Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N dimethyl sulfoxide Natural products CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical group CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 7
- 150000008065 acid anhydrides Chemical class 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000005054 agglomeration Methods 0.000 abstract description 5
- 230000002776 aggregation Effects 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 33
- 230000005661 hydrophobic surface Effects 0.000 description 25
- 239000001913 cellulose Substances 0.000 description 17
- 229920002678 cellulose Polymers 0.000 description 17
- 230000003075 superhydrophobic effect Effects 0.000 description 14
- 239000011259 mixed solution Substances 0.000 description 10
- 239000003822 epoxy resin Substances 0.000 description 9
- 229920000647 polyepoxide Polymers 0.000 description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 8
- 239000007822 coupling agent Substances 0.000 description 7
- 239000002086 nanomaterial Substances 0.000 description 7
- 241000609240 Ambelania acida Species 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000010905 bagasse Substances 0.000 description 6
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 6
- 229960002218 sodium chlorite Drugs 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 125000002887 hydroxy group Chemical class [H]O* 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000004826 Synthetic adhesive Substances 0.000 description 4
- 229960000583 acetic acid Drugs 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012362 glacial acetic acid Substances 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- OATFZMZHCHJBGR-UHFFFAOYSA-N ethenoxyperoxysilane Chemical compound C(=C)OOO[SiH3] OATFZMZHCHJBGR-UHFFFAOYSA-N 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- RSKGMYDENCAJEN-UHFFFAOYSA-N hexadecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCCCCCC[Si](OC)(OC)OC RSKGMYDENCAJEN-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
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- 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
- C09D105/00—Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
- C09D105/14—Hemicellulose; Derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
- B05D7/08—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood using synthetic lacquers or varnishes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0057—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Xylans, i.e. xylosaccharide, e.g. arabinoxylan, arabinofuronan, pentosans; (beta-1,3)(beta-1,4)-D-Xylans, e.g. rhodymenans; Hemicellulose; Derivatives thereof
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Paints Or Removers (AREA)
Abstract
The embodiment of the application discloses a hydrophobic coating for wood, a preparation method and a use method thereof, wherein the coating comprises a dispersant and nano silicon dioxide particles dispersed in the dispersant, wherein the main component of the dispersant is hemicellulose; or the main component of the dispersant is a mixture of hemicellulose and long-chain anhydride modified hemicellulose. The hemicellulose has good agglomeration performance, amphiphilic performance and dispersibility, so the dispersion liquid using the hemicellulose water solution as the hydrophobic coating has the comprehensive advantages of degradability, safety, environmental protection, relatively good coating adhesion effect, lower manufacturing cost and simple process, and has the application prospect of forming industrialization in the wood processing field.
Description
Technical Field
The invention relates to the technical field of hydrophobic coatings, in particular to a hydrophobic coating for film-forming modification of a wood surface; the invention also relates to a preparation method and a use method of the hydrophobic coating for wood.
Background
As a natural porous material, the hydrophilicity of wood makes the wood easily affected by the change of environmental humidity to swell, dry, shrink, deform, even cause mildew and decay. In the prior art, modification means for reducing wood hydrophilicity are abundant, and nano silicon dioxide is accumulated on the surface of wood to form a hydrophobic surface (namely a surface with a water contact angle larger than 90 degrees) or a super-hydrophobic surface (namely a surface with a water contact angle larger than 150 degrees and a sliding angle smaller than 10 degrees) which is a common method. The principle is that the nano silicon dioxide has lower surface energy, and can form a micro-nano structure with certain roughness on the surface of wood, so that the surface of the wood meets two elements of forming a hydrophobic or super-hydrophobic surface, namely a low surface energy and a micro-nano rough structure. For example, in chinese patent database, the invention patent application with publication number CN105599077A, entitled "a method for preparing super-hydrophobic wood based on sol-gel method" describes the following technical solutions: coating the nano silica sol subjected to hydrophobic modification on the surface of wood by adopting a dipping or spraying process, and drying by using an oven to form the super-hydrophobic film layer. Although the technical scheme overcomes the problems of mechanical property loss, environmental pollution and the like in the traditional thermal modification and chemical modification, the adhesion effect of the film layer formed by drying the nano silica sol and the surface of the wood is poor, and the film layer is easy to fall off along with the time, so that the time for providing hydrophobic protection for the surface of the wood is short.
In the chinese patent database, the publication No. CN103448116A entitled "method for improving mechanical stability of super-hydrophobic wood" describes the following technical solutions in the invention patent application: the method comprises the steps of firstly soaking wood in an epoxy resin solution to form an epoxy resin bottom layer on the surface of the wood, then soaking the wood with the epoxy resin bottom layer in a submicron silica solution modified by a coupling agent, taking out and drying, finally soaking the wood in an OTS ethanol solution, taking out and drying to form the super-hydrophobic film layer. And in the Chinese patent database, the invention patent application with the publication number of CN 10556577A and the name of 'a method for improving the mechanical stability of a hydrophobic membrane on the surface of wood' describes the following technical scheme: firstly, wood is soaked in an epoxy resin solution to form an epoxy resin bottom layer on the surface of the wood, then hydrophobic nano silicon dioxide particles/epoxy resin/triethoxy-1H, 2H and 2H-heptadecafluorodecyl silane organic-inorganic composite coating solution is prepared, the solution is coated on the epoxy resin bottom layer through a soaking or spraying process, and finally, the super-hydrophobic film layer is formed through drying. According to the technical scheme, the adhesion effect of the super-hydrophobic film layer and the surface of the wood can be improved through the crosslinking between the epoxy resin in the coating solution and the epoxy resin bottom layer on the surface of the wood and the action of the coupling agent, however, most of the synthetic adhesives are petroleum-based chemicals, petroleum resources need to be consumed, natural degradation is difficult, and the environmental protection performance of the wood as a renewable resource can be reduced when the synthetic adhesives are used for treating the wood. At the same time, fluorinated compounds can cause environmental pollution and safety hazards in production, as well as increase in production cost.
In a Chinese patent database, the publication number is CN110499073A, and the invention patent application named as 'a method for preparing super-hydrophobic coating by modifying a fluorine-free modifier in aqueous solution by using nano-cellulose and nano-particles as raw materials' describes the following technical scheme: firstly loading a coupling agent (gamma-aminopropyltriethoxysilane) on nano-cellulose in deionized water to prepare a modified nano-cellulose solution, dispersing nano-particles (nano-silica particles) in the deionized water, promoting the dispersion by hexadecyl trimethoxysilane and formic acid to prepare a modified silica solution, mixing the modified nano-cellulose solution and the modified silica solution to obtain a super-hydrophobic coating, and finally spraying the super-hydrophobic coating on a substrate to form a super-hydrophobic film layer. According to the technical scheme, the nano-cellulose is used as a raw material to replace a synthetic adhesive, so that the environmental hazard and the potential safety hazard in production are reduced, but in actual operation, the price of the nano-cellulose raw material is high, so that the technical scheme is difficult to be applied to industrialization in the field of wood processing.
Disclosure of Invention
The invention aims to overcome at least one of the technical problems and provides a paint for hydrophobic modification of wood, and also provides a preparation method and a modification treatment method of the hydrophobic paint for wood.
In order to achieve the above objects, a first embodiment of the present invention provides a hydrophobic paint for wood, the paint including a dispersant, and nano silica particles dispersed in the dispersant, wherein a main component of the dispersant is hemicellulose, or a main component of the dispersant is a mixture of hemicellulose and long-chain acid anhydride modified hemicellulose.
Preferably, in the coating material, a ratio of a concentration of the main component to a concentration of the nano silica particles is 1.
Preferably, the long-chain anhydride modified hemicellulose is dodecenyl succinic anhydride graft modified hemicellulose.
Preferably, in the coating material, the dispersant is an aqueous solution of the main component.
In order to accomplish the above objects, a second embodiment of the present invention provides a method for preparing a hydrophobic coating for wood, comprising a dispersant preparing process and a mixing process, wherein,
the dispersant preparation step is a step of dissolving a main component in water under stirring to obtain a dispersant, wherein the main component is hemicellulose or a mixture of hemicellulose and long-chain acid anhydride modified hemicellulose;
the mixing treatment step is a step of further dispersing the nano silica particles in the dispersant under stirring to obtain the coating material.
Preferably, the long-chain anhydride modified hemicellulose is prepared by a hemicellulose modification process, specifically, the hemicellulose is obtained by performing esterification reaction on the hemicellulose and a hemicellulose modifier in an alkaline environment, wherein the hemicellulose modifier is a dodecenyl succinic anhydride reagent.
Preferably, the hemicellulose is dissolved in a solvent at 58 to 62 ℃, the solvent in which the hemicellulose is dissolved is cooled, and a catalyst and the hemicellulose modifier are added to the solvent after the temperature of the solvent is reduced to 48 to 52 ℃.
Preferably, the molar ratio between the amount of the hemicellulose modifier and the amount of the hemicellulose to be modified is (0.60-0.80): 1.
Preferably, the solvent is dimethyl sulfoxide solvent and the catalyst is 4-dimethylaminopyridine powder.
In order to achieve the above objects, a third embodiment of the present invention provides a method for using a hydrophobic coating for wood, the coating comprising a dispersant and nano silica particles dispersed in the dispersant, wherein the main component of the dispersant is hemicellulose, or the main component of the dispersant is a mixture of hemicellulose and long-chain acid anhydride modified hemicellulose; and soaking the wood to be treated in the coating for 18-72 h, and then finishing the drying of the wood and the coating on the surface of the wood within 35 min.
Compared with the prior art, the product and the method have the advantages that:
1. the hemicellulose has good agglomeration performance, amphiphilic (nano silicon dioxide and wood) performance and dispersibility, so that the dispersion liquid using the hemicellulose water solution as the hydrophobic coating has the comprehensive advantages of degradability, safety, environmental protection, relatively good coating adhesion effect and simple process, and has an industrial application prospect in the wood processing field.
2. The long-chain anhydride modified hemicellulose is used for partially replacing the hemicellulose, so that the dispersing efficiency of the dispersing agent and the particle size of the agglomerate can reach a synergistic high-efficiency level, the roughness and the uniformity of a micro-nano structure on the hydrophobic surface of the coating after film forming can be improved, and the hydrophobic performance of the hydrophobic surface can be further improved. Meanwhile, the affinity of the long-chain anhydride modified hemicellulose to the surface of the wood is higher than that of the hemicellulose, so that the adhesion effect of the coating and the surface of the wood can be improved, the effective hydrophobic time of the hydrophobic surface is prolonged, and the service life of the hydrophobic surface is prolonged. Furthermore, the esterified hemicellulose has higher hydrophobic property than hemicellulose, so that the hydrophobic property of the coating can be improved in an auxiliary manner.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic representation of the surface contact angle of the hydrophobic surface obtained by coating the surface of wood with the coatings of examples 1, 2, 3, 4.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
Example 1
The hydrophobic coating for the wood comprises a dispersing agent and nano silicon dioxide particles dispersed in the dispersing agent. Specifically, the dispersant is an aqueous solution, and the main component of the dispersant is hemicellulose; in the coating, the ratio of the concentration of hemicellulose to the concentration of nano silica particles is 1.
The inventor creatively discovers in long-term research practice that hemicellulose has relatively good agglomeration performance, amphiphilic performance and dispersion performance, so that the hemicellulose can be used as a carrier of nano silica particles and a coupling agent of the nano silica particles and the surface of wood, and a hydrophobic coating taking a hemicellulose aqueous solution as a dispersion liquid and a nano silica particle stacking main agent is prepared. Compared with the nano silica gel coating and the coating with the synthetic adhesive for dispersing the nano silica particles in the prior art, the coating of the embodiment has the comprehensive advantages of degradability, safety, environmental protection and relatively good coating adhesion effect. Additionally, compared with the prior art of the coating with the nano silicon dioxide particles dispersed by the cellulose solution, the technical scheme of the application does not use additional coupling agent and dispersing agent, so that the preparation method has the advantage of relatively low manufacturing cost. By combining the advantages, the method has an industrial application prospect in the field of wood processing.
Specifically, the good agglomeration performance enables the nano silicon dioxide particles dispersed in the hemicellulose water solution to form an agglomerate with a large (but proper) particle size, so that a micro-nano structure with relatively high roughness is formed during film formation to construct a hydrophobic surface with good hydrophobic performance. The better amphiphilic property of the hemicellulose is represented by the following properties: the nano silicon dioxide particles can be agglomerated in the hemicellulose water solution to form an agglomerate with a certain particle size, and meanwhile, as a part of the wood fiber raw material, the hemicellulose has strong affinity with the surface of the wood, so the hemicellulose can be used as a connecting bridge between the nano silicon dioxide particles and the surface of the wood, one surface of the nano silicon dioxide particles is loaded, and the other surface of the nano silicon dioxide particles is attached to the surface of the wood with affinity. Therefore, the coating provided by the technical scheme of the application does not need to add a dispersing agent to promote the dispersing efficiency of the nano silicon dioxide particles or a coupling agent to promote the adhesion of the nano silicon dioxide particles on the surface of wood, so that the manufacturing cost of the coating can be further reduced, and the manufacturing process of the coating is simplified. The good dispersion performance enables the nano silicon dioxide particles to be uniformly dispersed in the hemicellulose water solution to form an agglomerate with larger (but proper) particle size, so that the film forming uniformity and the roughness of the micro-nano structure are improved. It is worth noting that in the prior art, the coating for dispersing the nano silica particles by the cellulose solution must use an auxiliary dispersing agent, or the nano silica particles are modified to have better dispersing performance, otherwise the nano silica particles are excessively agglomerated in the cellulose solution to cause that the particle size of the agglomerate is too large to form a coating with a micro-nano structure.
Preferably, the hemicellulose is extracted and prepared from bagasse. Firstly, bagasse is put into a plant crusher to be crushed and screened to obtain a bagasse sample of 40-60 meshes, the bagasse sample is extracted for 6 hours by using absolute ethyl alcohol in a Soxhlet extractor, and after standing and air drying, the bagasse sample is dried in an oven at 70 ℃ to obtain a first dry intermediate product. Then, putting the first intermediate product into an erlenmeyer flask, adding a 2.0wt% sodium chlorite solution to obtain a first mixed solution, wherein the solid-liquid ratio of the first intermediate product to the sodium chlorite solution is 1/25, adjusting the pH value of the first mixed solution to 4.5 by using glacial acetic acid (acetic acid), and reacting for 1h by using a heating magnetic stirrer at the conditions of 60 ℃ and 450rpm to obtain a second mixed solution; continuously adding a sodium chlorite solution into the second mixed solution to increase the concentration of the sodium chlorite solution to 3.0wt%, maintaining the pH value of the second mixed solution at 4.5 by using glacial acetic acid, and continuously reacting for 1h to obtain a third mixed solution; and continuously adding the sodium chlorite solution into the third mixed solution to increase the concentration of the sodium chlorite solution to 3.0wt%, maintaining the pH value of the third mixed solution at 4.5 by using glacial acetic acid, and continuously reacting for 1h (in the period, dispersing the bagasse raw material solution by using a glass rod every 15min to uniformly react) to obtain a fourth mixed solution. And after the reaction is finished, filtering the fourth mixed solution, collecting the solid part to obtain the holocellulose, and drying the holocellulose in an oven at the drying condition of 70 ℃ until the dryness is more than 90%. And finally, adding a 1.5% sodium hydroxide solution into the dried holocellulose, wherein the solid-liquid ratio of the holocellulose to the sodium hydroxide solution is 1.
The nanosilica particles used are obtained commercially. For example, the nano-silica particles with the model SP30T have the particle size of 30 +/-5 nm, the specific surface of 150-300 m/g and the pH value of 5-7.
The method for preparing the hydrophobic coating for wood by utilizing the hemicellulose and the nano silicon dioxide particles comprises a preparation process of a dispersing agent and a mixing treatment process, taking 100ml of the coating as an example:
the dispersant preparation step is a step of dissolving the main component in water under stirring to prepare a dispersant, and the main component in this example is hemicellulose. Specifically, hemicellulose was dissolved in water using a heated magnetic stirrer at a temperature of 60 ℃ and a rotation speed of 400 rpm. The mass ratio of hemicellulose to water was 1.
The mixing treatment is a step of further dispersing the nano silica particles in the dispersant under stirring to obtain the coating material. Specifically, dissolving nano silicon dioxide particles in a dispersing agent, and then dispersing the dispersing solution for 5min by using an ultrasonic cell wall breaking instrument. The mass ratio of the nano silica particles to the hemicellulose was 1, in other words, 1.0g of the nano silica particles were dispersed in the above dispersant.
The application method of the hydrophobic coating is to soak the wood to be treated in the coating prepared by the method for 18 to 72 hours (for example, 24 hours), and the application amount of the coating only needs to be enough to immerse the wood. The drying of the wood and the paint coating on its surface is then completed within 35 min. For example, wood soaked with paint is placed in an oven and the paint coating on the wood and the surface thereof is dried rapidly within 30min by drying conditions of 105 ℃. The rapid drying helps the coating to form a stable coating on the wood surface, avoiding excessive penetration of moisture in the coating.
The surface properties of the hydrophobic surface obtained by coating the surface of wood with the coating of example 1 are shown in table 1. The contact angle of the abraded wood in the experimental project is obtained by placing the hydrophobic surface of the wood in 12000Pa high-pressure sand paper for 15cm to-and-fro friction for 100 times and measuring the surface contact angle; the coating aggregate particle size is the average geometric particle size of the aggregate. The experimental control group 1 is a hydrophobic coating prepared by taking unmodified cellulose aqueous solution as a dispersing agent, and the control group 2 is a hydrophobic coating prepared by nano silica sol grafted and modified by vinyl trioxysilane polymer; the coatings of the control group 1 and the control group 2 are coated on the wood surface by a method of soaking for 24 hours, and are dried in an oven in an environment of 105 ℃ for 30min.
TABLE 1 hydrophobic Wood surface Properties obtained by applying the coating of example 1
As can be seen from the data in table 1, although the wood surface formed by the hydrophobic coating prepared by using the hemicellulose aqueous solution as the dispersant is only close to but not up to the performance level of the super-hydrophobic surface (the surface contact angle should reach 150 °), it is obvious that the hydrophobic coating of the embodiment is only composed of water, hemicellulose and nano silica particles, and is a degradable coating, so that the use of the coating does not affect the environmental protection of wood as a renewable resource, the components are relatively simple, and no additional coupling agent or dispersant is required, so that the production and manufacturing cost is reduced, and the coating is safe and environment-friendly.
Further, the excessively large particle size of the cellulose-nano silica particle agglomerates affects the dispersion efficiency of the agglomerates in the dispersant, and the excessively large particle size and the low dispersion efficiency make it difficult for the coating of the cellulose-nano silica system of the control group 1 to form a relatively uniform micro-nano structure after film formation, thereby causing poor hydrophobic effect of a hydrophobic surface formed by the coating. In the coating of the embodiment, the particle size of the hemicellulose-nano silicon dioxide particle agglomerates is large and moderate, and the dispersion efficiency is relatively higher, so that compared with the coating of the control group 1, a hydrophobic surface with better hydrophobic property can be obtained. Additionally, the manufacturing cost of hemicellulose is lower than that of cellulose, so compared with the control group 1, the technical scheme of the embodiment can achieve the effect of obtaining a better hydrophobic surface at a lower cost.
Further, the hydrophobic surfaces of example 1, control 1 and control 2 were reduced in hydrophobic angle by 23.1%, 24.6% and 34.1%, respectively, after repeated rubbing with sandpaper. Therefore, the cellulose, the nano silicon dioxide particle agglomerates, the hemicellulose and the nano silicon dioxide particle agglomerates can form relatively better cross-linking with the surface of the wood through hydrogen bond connection and chemical bond connection formed in the soaking and hot drying processes of the cellulose, the hemicellulose and the surface of the wood, so that the coating has a better adhesion effect with the surface of the wood compared with the coating of the hydrophobic modified nano silicon dioxide sol system of the control group 2.
In conclusion, considering the hydrophobic property which can be achieved by the coating of the embodiment and the advantages of low manufacturing cost, safety and environmental protection, the comprehensive performance of the coating is superior to that of the coating of a cellulose-nano silica system and the coating of a hydrophobic modified nano silica sol system, and the coating can become a waterproof coating for industrial application in the wood processing field.
Example 2
Example 2 differs from example 1 in that the main component of the dispersant is a mixture of hemicellulose and long-chain acid anhydride-modified hemicellulose, in other words, the dispersant is an aqueous solution of a mixture of hemicellulose and long-chain acid anhydride-modified hemicellulose; meanwhile, in the coating material, the ratio of the concentration of the main component (mixture of hemicellulose and long-chain acid anhydride modified hemicellulose) to the concentration of the nano silica particles is 1. Preferably, the long-chain anhydride modified hemicellulose is dodecenyl succinic anhydride graft modified hemicellulose. Of course, other esterified modified hemicelluloses as would be known to one of ordinary skill in the art may also be the major component of the dispersant of the present application.
Compared with the technical scheme of the embodiment 1, in the embodiment, the long-chain anhydride modified hemicellulose is used for replacing the hemicellulose, so that the dispersing efficiency of the dispersing agent and the particle size of the agglomerate can reach a synergistic high-efficiency level, the roughness and the uniformity of the micro-nano structure of the hydrophobic surface after the coating is formed into a film can be improved, and the hydrophobic performance of the hydrophobic surface can be further improved. The inventor creatively discovers that the affinity of the long-chain anhydride modified hemicellulose with the wood surface is higher than that of the hemicellulose, so that the adhesion effect of the coating and the wood surface can be improved, the effective hydrophobic time of the hydrophobic surface is prolonged, and the service life of the hydrophobic surface is prolonged. Furthermore, the esterified hemicellulose has higher hydrophobic property than hemicellulose, so that the hydrophobic property of the coating can be improved in an auxiliary manner.
The method for preparing the hydrophobic coating by using the long-chain anhydride modified hemicellulose and the nano silicon dioxide particles comprises a hemicellulose modification process, a dispersant preparation process and a mixing treatment process, and takes 100ml of the coating as an example:
the working procedure of hemicellulose modification is to carry out esterification reaction on hemicellulose and a hemicellulose modifier in an alkaline environment to prepare the hemicellulose modifier.
Specifically, the hemicellulose is modified by dissolving the hemicellulose obtained by the preparation in a solvent, preferably dimethyl sulfoxide solvent (DMSO), in a heated magnetic stirrer at a rotation speed of 60 ℃, 300rpm or 400 rpm. The mass ratio of the hemicellulose to the solvent is 1 (380-420), for example, 1.98g of the hemicellulose is taken, and 80ml of dimethyl sulfoxide solvent (DMSO) is taken. And then, cooling the solvent dissolved with the hemicellulose, and adding a catalyst and a hemicellulose modifier into the solvent after the temperature of the solvent is reduced to 50 +/-2 ℃. Preferably, the catalyst is 4-Dimethylaminopyridine (DMAP) and the mass ratio of catalyst to hemicellulose is about 2. The hemicellulose modifier is dodecenyl succinic anhydride (DDSA, concentration 266.38 g/mol). The different ratio of the amount of dodecenyl succinic anhydride (DDSA) to the amount of hemicellulose charged can affect the degree of esterification of the hemicellulose in the modification reaction. In this example, four types of modified hemicellulose, which are referred to as DDSA-0.05, DDSA-0.15, DDSA-0.25, and DDSA-0.50, were obtained by controlling the molar ratio of the two to 0.05. And finally, obtaining mixed powder of the hemicellulose and the dodecenyl succinic anhydride graft modified hemicellulose by drying and drying means in the prior art.
Subsequently, in the dispersant preparation process, 1.0g of the mixed powder of the hemicellulose and the dodecenylsuccinic anhydride graft-modified hemicellulose was added to 100ml of water under continuous stirring at 60 ℃ to obtain a dispersant.
And finally, in the mixing treatment process, adding 1.0g of nano silicon dioxide particles into the dispersing agent at the temperature of 60 ℃ under the state of continuous stirring, uniformly dispersing, transferring into an ultrasonic cell disruption instrument, and continuously dispersing for 5min to obtain the coating.
The application method of the hydrophobic coating is to soak the wood to be treated in the coating prepared by the method for 30 hours, and the application amount of the coating only needs to be enough to immerse the wood. And then the wood soaked with the paint is placed in an oven, and the paint coating on the wood and the surface of the wood is quickly dried within 25min by adopting a drying condition of 108 ℃.
Example 3
Example 3 is different from example 2 in that the main component of the dispersant of the hydrophobic dope is a mixture of hemicellulose and dodecenyl succinic anhydride graft-modified hemicellulose, and dodecenyl succinic anhydride (DDSA) is attached to the surface of the mixture.
In the hemicellulose-modifying step, the molar ratio of dodecenyl succinic anhydride (DDSA) to hemicellulose was controlled to 0.75 to obtain a modified hemicellulose, which was referred to as DDSA-0.75. Finally, mixed powder of the hemicellulose with dodecenyl succinic anhydride (DDSA) attached to the surface and the dodecenyl succinic anhydride graft modified hemicellulose is obtained by drying and drying means in the prior art.
In the dispersant preparation process, at 60 degrees C, continuously stirring state, to 100ml water adding 1.0g of the powder, to obtain a dispersant.
Example 4
Example 4 differs from example 3 in that in the hemicellulose modification step, the molar ratio of dodecenyl succinic anhydride (DDSA) to hemicellulose is controlled to 0.85 to obtain a modified hemicellulose, which is denoted as DDSA-0.85.
The surface contact angles of the hydrophobic surfaces obtained by coating the surfaces of the wood with the coatings of examples 1, 2, 3, 4 are shown in fig. 1.
The surface properties of the hydrophobic surfaces obtained by coating the coatings of examples 2, 3, 4 on the surface of wood are shown in table 2, wherein the technical scheme of example 1 can be written as DDSA-0.
TABLE 2 hydrophobic Wood surface Properties obtained by applying the coatings of examples 2, 3, 4
As can be seen from the data in table 2, the degree of substitution of hydroxyl groups of hemicellulose and the molecular weight of dodecenyl succinic anhydride graft-modified hemicellulose increased as the molar ratio of dodecenyl succinic anhydride (DDSA) to hemicellulose increased, but when the degree of substitution reached about 0.50, the esterification reaction of hemicellulose did not continue even if the amount of dodecenyl succinic anhydride (DDSA) used was increased, and the molecular weight maintained the level of the degree of substitution of about 0.50. With the progress of esterification reaction, due to the steric hindrance relationship, long-chain anhydride can not perform esterification reaction with unreacted hydroxyl, the reaction reaches an equilibrium state, and the hydroxyl substitution degree of hemicellulose is not increased along with the increase of the usage amount of dodecenyl succinic anhydride (DDSA).
When the esterification reaction occurs, the dispersing efficiency of the dispersing agent is greatly improved, but the dispersing efficiency is reduced along with the increase of the molar ratio of the dodecenyl succinic anhydride (DDSA) to the hemicellulose until the molar ratio of the dodecenyl succinic anhydride (DDSA) to the hemicellulose reaches 0.75 (namely DDSA-0.75), and the transition type is improved, wherein the dispersing efficiency of the dispersing agent exceeds the value of the example 1 (DDSA-0) again. The dispersion efficiency of the dispersant still maintained the level of DDSA-0.75 by continuing to increase the molar ratio of the two. The experimental results of the agglomerate particle size are similar to those of the case of the dispersion efficiency. From the above data, it can be seen that the aqueous solution of hemicellulose modified by the esterification reaction affects the formation of agglomerates of nano silica particles, so the particle size of the agglomerates is small but the dispersion efficiency of the dispersant is relatively high, which makes the molar ratio of dodecenyl succinic anhydride (DDSA) to hemicellulose lower the hydrophobic properties (surface contact angle, contact angle after 14 s) of the hydrophobic surface of the paint after film formation compared to the hemicellulose before the esterification reaction reaches the equilibrium state. However, when the esterification reaction reaches an equilibrium state and stops the reaction, the particle size of the agglomerates suddenly increases, and at the same time, the dispersion efficiency does not decrease due to the increase in the particle size of the agglomerates, but rather a synergistic increase occurs. After the particle size of the agglomerate and the dispersion efficiency are synergistically increased, the hydrophobic property of the DDSA-0.75 hydrophobic surface is promoted in a transition mode.
The mechanism of the above phenomenon is not clear, and the inventor speculates that residual dodecenyl succinic anhydride (DDSA) is attached to the surface of hemicellulose or the surface of the hemicellulose graft-modified by dodecenyl succinic anhydride due to insufficient esterification reaction, and after the dispersant is prepared, the residual dodecenyl succinic anhydride (DDSA) is insoluble in water, so that the agglomeration of the hemicellulose or the hemicellulose graft-modified by dodecenyl succinic anhydride and nano silica particles can be promoted, the particle size of an agglomerate is increased, and the dispersion of the agglomerate in the dispersant can be promoted.
Therefore, although the long-chain anhydride modified hemicellulose has a negative effect on the hydrophobic property of the coating material, when the hemicellulose, the long-chain anhydride modified hemicellulose and the dodecenyl succinic anhydride (DDSA) coexist, a relatively good hydrophobic effect can be achieved, and the hydrophobic surface reaches the level of a super-hydrophobic surface.
Further, it is currently believed that the loading of nano silica particles on cellulose can improve the hydrophilicity of cellulose, and therefore, in the technical scheme of the prior art, only nano silica particles are loaded on the surface of cellulose to form an agglomerate, so as to serve as a hydrophobic coating. However, the inventor finds that the hydrophilicity of the cellulose itself still influences the durability of the hydrophobic effect of the hydrophobic surface, namely the expression of the hydrophobic angle after 14 s. Since the modification of hemicellulose by dodecenyl succinic anhydride (DDSA) is achieved by replacing hydroxyl groups, dodecenyl succinic anhydride (DDSA) actually also reduces the hydrophilicity of hemicellulose at the same time, resulting in an improved hydrophobic durability of the coating.
In conclusion, when the mole ratio of dodecenyl succinic anhydride (DDSA) to hemicellulose is in the level of (0.7-0.8): 1, the hemicellulose, the long-chain anhydride modified hemicellulose and the dodecenyl succinic anhydride (DDSA) which coexist in the coating can promote the hydrophobic property of the hydrophobic surface, the durability of the hydrophobic property and the adhesion effect of the coating.
Example 5
The difference between the embodiment 5 and the embodiment 3 is that the application method of the hydrophobic coating in the embodiment comprises the steps of spraying water on the surface of wood to be treated, wherein the water spraying amount is 30 grams per square meter to 35 grams per square meter; sanding the wood surface in the state that the water spraying surface is not dried, wherein the model of the sandpaper is 240#, 320# or 400#. And soaking the sanded wood in the coating for 30 hours, wherein the temperature of the coating is maintained at 55 ℃ by heating during soaking, and the using amount of the coating only needs to be capable of immersing the wood. And then the wood soaked with the paint is placed in an oven, and the paint coating on the wood and the surface of the wood is quickly dried within 30min by adopting the drying condition of 105 ℃. The surface properties of the hydrophobic surface obtained by coating the surface of the wood with the coating of example 5 are shown in table 3.
TABLE 3 hydrophobic Wood surface Properties obtained by applying the coating of example 5
As can be seen from the data in table 3, in example 5, the adhesion effect of the coating material on the treated surface can be improved by applying a soaking temperature of 55 ℃ and roughening the surface of the wood before the soaking treatment. The inventors believe that this phenomenon is initiated by residual dodecenyl succinic anhydride (DDSA) contacting the wood surface. Specifically, after residual dodecenyl succinic anhydride (DDSA) contacts the surface of wood, esterification reaction occurs on the surface of the wood under specific conditions, hydroxyl on the surface of the wood is replaced, the hydrophobicity of the surface of the wood is improved, meanwhile, the affinity between dodecenyl succinic anhydride graft modified hemicellulose in the coating and the surface of the wood is improved, and further, the adhesion effect of the coating and the surface of the wood is improved. The reduction amplitude of the contact angle after abrasion is reduced from 23-30 percent to 14.0 percent. Obviously, the coating preparation method and the coating using method of example 5 can improve the adhesion effect and the service life of the coating.
The foregoing description is intended to be illustrative and not limiting. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not a disclaimer of such subject matter, nor is it to be construed that the applicant does not consider such subject matter to be part of the disclosed subject matter.
Claims (10)
1. The hydrophobic coating for wood is characterized by comprising a dispersing agent and nano silicon dioxide particles dispersed in the dispersing agent, wherein the main component of the dispersing agent is hemicellulose or the main component of the dispersing agent is a mixture of the hemicellulose and long-chain anhydride modified hemicellulose.
2. The hydrophobic coating for wood according to claim 1, wherein the ratio of the concentration of the main component to the concentration of the nano silica particles in the coating is 1.
3. The hydrophobic wood coating of claim 1, wherein the long chain anhydride modified hemicellulose is a dodecenyl succinic anhydride graft modified hemicellulose.
4. The hydrophobic coating for wood according to claim 1, wherein the dispersant is an aqueous solution of the main component in the coating.
5. A method for preparing hydrophobic paint for wood is characterized by comprising a preparation process of a dispersant and a mixing treatment process, wherein,
the dispersant preparation step is a step of dissolving a main component in water under stirring to obtain a dispersant, wherein the main component is hemicellulose or a mixture of hemicellulose and long-chain acid anhydride modified hemicellulose;
the mixing treatment step is a step of further dispersing the nano silica particles in the dispersant under stirring to obtain the coating material.
6. The method for preparing the hydrophobic wood coating according to claim 5, wherein the long-chain anhydride modified hemicellulose is prepared through a hemicellulose modification process, specifically, the hemicellulose is prepared through an esterification reaction of the hemicellulose and a hemicellulose modifier under an alkaline environment, wherein the hemicellulose modifier is a dodecenyl succinic anhydride reagent.
7. The method of claim 6, wherein the hemicellulose is modified by dissolving hemicellulose in a solvent at 58-62 ℃, cooling the solvent in which the hemicellulose is dissolved, and adding a catalyst and the hemicellulose modifier to the solvent after the temperature of the solvent is lowered to 48-52 ℃.
8. The method for preparing the hydrophobic paint for wood according to claim 6, wherein the molar ratio between the amount of the hemicellulose modifier and the amount of the hemicellulose to be modified is (0.60-0.80): 1.
9. The method for preparing a hydrophobic paint for wood as claimed in claim 7, wherein the solvent is dimethyl sulfoxide solvent and the catalyst is 4-dimethylaminopyridine powder.
10. The application method of the hydrophobic coating for the wood is characterized in that the coating comprises a dispersing agent and nano silicon dioxide particles dispersed in the dispersing agent, wherein the main component of the dispersing agent is hemicellulose, or the main component of the dispersing agent is a mixture of the hemicellulose and long-chain anhydride modified hemicellulose; and soaking the wood to be treated in the coating for 18-72 h, and then finishing the drying of the wood and the coating on the surface of the wood within 35 min.
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Application publication date: 20230103 Assignee: RONGXIAN RUNDA FURNITURE CO.,LTD. Assignor: GUANGXI ZHUANG AUTONOMOUS REGION FORESTRY Research Institute Contract record no.: X2023980045102 Denomination of invention: A hydrophobic coating for wood and its preparation and use method Granted publication date: 20230623 License type: Common License Record date: 20231102 |