CN112876978B - Preparation method of single-component root-puncture-resistant waterproof coating - Google Patents
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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
- 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
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
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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
- 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
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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
- 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
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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Abstract
The invention discloses a preparation method of a single-component root-puncture-resistant waterproof coating, which comprises the following steps: mixing polyol, surface functionalized boron nitride, polyisocyanate and a compound shown in a formula (I) for reaction, adding a chain extender for reaction until the NCO content in reactants reaches a set value, and stopping the reaction to prepare a prepolymer, wherein the set value is 2-5%; mixing the obtained prepolymer with the rest raw materials; wherein R is1‑(CH2)n‑Si(OR2)3(I), wherein: r1Is amino or hydroxy, R2Is C1‑6Alkyl or-R3‑O‑R4，R3、R4Each independently selected from methyl, ethyl or propyl; the single-component root-puncture-resistant waterproof coating prepared by the method disclosed by the invention has the advantages of environmental protection performance, excellent root resistance, high strength and good elongation rate while no root-blocking agent is added.
Description
The invention is a divisional application of Chinese patent application with the application date of 2019, 8 and 2, the application number of 2019107126107 and the name of 'a single-component root-puncture-resistant waterproof coating and a preparation method thereof'.
Technical Field
The invention belongs to the field of building waterproofing, and particularly relates to a preparation method of a single-component root penetration resistant waterproof coating.
Background
The waterproof film formed by curing the coating of the waterproof coating smeared on the base layer has certain strength, better extensibility, crack resistance, impermeability and weather resistance, and simultaneously has good temperature adaptability, simple and convenient operation and easy maintenance. Compared with the waterproof coiled material, the waterproof coating has strong adaptability to the base layer, and the waterproof layer has no seam and has higher reliability. Due to the above characteristics, the waterproof coating is one of the main waterproof materials frequently used in waterproof engineering.
At present, a roof greening system of a building generally adopts common waterproof coating, either the roof greening system has no root penetration resistance or has root penetration resistance, but the waterproof coating with the root penetration resistance does not achieve ideal effects on the technical indexes of physical properties such as tensile strength, bonding strength, elongation at break and the like, so that plant roots planted in roof greening can finally penetrate through a waterproof coating layer, and the waterproof failure is caused. Once a roof leaks, it is subject to a series of catastrophic problems that the entire roof is scrapped off, repaired and the high cost of repair and renovation must be incurred. Meanwhile, the existing root penetration resistant waterproof coating is generally added with a root-resisting agent to realize the root penetration resistance, for example, the (R) -2- (4-chloro-2-methylphenoxy) octyl propionate and other root-resisting agents are added, but the root-resisting agent has high cost and difficult preparation, contains halogen elements, is not beneficial to environmental protection and the like.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to overcome the defects in the prior art, and provide a method for preparing a single-component root-penetration-resistant waterproof coating, wherein the single-component waterproof coating prepared by the method has the advantages of environmental protection performance, excellent root resistance, high strength and good elongation rate while no root-blocking agent is added.
In order to solve the technical problems, the invention adopts a technical scheme as follows:
the single-component root-puncture-resistant waterproof coating comprises raw materials including polyisocyanate, polyol, a chain extender, an amino latent curing agent, a compound shown in a formula (I) and surface functionalized boron nitride, wherein the surface functionalized boron nitride is surface hydroxylated boron nitride and/or surface aminated boron nitride;
R1-(CH2)n-Si(OR2)3(I), wherein: r1Is amino or hydroxy, R2Is C1-6Alkyl or-R3-O-R4，R3、R4Each independently selected from methyl, ethyl or propyl; the feeding amount of the surface functionalized boron nitride accounts for 1-5% of the total feeding amount of the raw materials in percentage by mass, and the feeding amount of the compound shown in the formula (I) accounts for 0.5-3% of the total feeding amount of the raw materials.
According to some preferred and specific aspects of the invention, R1Is an amino group.
According to some preferred and specific aspects of the invention, R2Is methyl, ethyl, propyl, -CH2-O-CH3、-CH2CH2-O-CH3or-CH2-O-CH2CH3。
According to some embodiments of the invention, the compound of formula (I) is gamma-aminopropyltriethoxysilane and/or gamma-aminopropyltrimethoxysilane.
According to some specific and preferred aspects of the present invention, the surface hydroxylated boron nitride is prepared by mixing boron nitride with an aqueous solution of an alkaline hydroxide, and reacting with stirring at a temperature of 90 to 150 ℃.
In some embodiments of the present invention, the method for preparing the surface hydroxylated boron nitride is as follows: adding boron nitride (with the purity of more than or equal to 99% and the particle size of 2-5 microns) into a three-mouth reaction bottle, then adding the boron nitride into a prepared sodium hydroxide aqueous solution, mechanically stirring the mixture for 10 hours under the oil bath heating condition at the temperature of about 100 ℃, washing the obtained mixture with distilled water for multiple times until the filtrate is neutral, and drying the filtrate to obtain the surface hydroxylated boron nitride.
In other embodiments of the present invention, the surface hydroxylated boron nitride may also be obtained commercially.
According to some specific and preferred aspects of the present invention, the surface-aminated boron nitride is prepared by the following method: mixing boron nitride with an amino organic compound, and performing ball milling under the atmosphere of inert protective gas to obtain the aminated boron nitride, wherein the amino organic compound is one or more selected from urea, tetraethylenepentamine and triphenylamine.
In some embodiments of the present invention, the method for preparing the surface aminated boron nitride specifically comprises the following steps: adding boron nitride and urea into a ball mill under the nitrogen atmosphere, ball-milling for 10h at normal temperature, taking out the ball-milled mixture, washing with deionized water for multiple times, and drying to obtain the surface amination boron nitride.
In other embodiments of the present invention, the surface aminated boron nitride may also be obtained commercially.
According to some preferred aspects of the present invention, the waterproof coating material is prepared by the following method: mixing and reacting polyol, polyisocyanate, a compound shown in formula (I) and surface functionalized boron nitride, adding a chain extender for reaction to obtain a prepolymer, controlling the NCO content in the prepolymer after reaction to be 2-5%, and mixing the prepolymer with the rest raw materials to obtain the waterproof coating.
According to some preferred aspects of the invention, the raw materials comprise, by mass, 5-10 parts of polyisocyanate, 20-30 parts of polyol, 0.5-2 parts of compound represented by formula (I), 0.5-3 parts of surface functionalized boron nitride, 1-5 parts of chain extender, 1-5 parts of amino latent curing agent, 25-45 parts of filler, 5-15 parts of plasticizer, 0.1-1 part of catalyst and 0-1 part of defoaming agent.
According to some specific aspects of the present invention, the polyol is at least one selected from polyether diols, polyester diols, and polyether triols, for example including but not limited to polyether 330N, polyether 1000, polyether 2000, and the like.
According to some specific aspects of the present invention, the polyisocyanate is a combination of one or more selected from the group consisting of diisocyanates and prepolymers thereof, triisocyanates and prepolymers thereof, including, for example, but not limited to, Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), Naphthylamine Diisocyanate (NDI), and the like.
According to some specific aspects of the present invention, the filler is one or more selected from fumed silica, gypsum whiskers, nano calcium carbonate, nano aluminum nitride, nano boron nitride, nano aluminum borate, heavy calcium, talc, light calcium, kaolin, and wollastonite powder.
According to some specific aspects of the present invention, the plasticizer is at least one selected from DINP, DIDP, chlorinated paraffin, dioctyl adipate, glycol benzoate, trioctyl phosphate, and phenyl alkylsulfonate.
According to some specific aspects of the invention, the defoamer is a polysiloxane defoamer, or a combination of one or more of a silicone defoamer, calcium oxide, magnesium oxide, and calcium hydroxide.
According to some specific aspects of the present invention, the catalyst is at least one selected from the group consisting of dibutyltin dilaurate, stannous octoate, eco-friendly non-butyltin catalysts, bismuth carboxylate-based catalysts, zinc naphthenate, pentamethyldipropylenetriamine, tetramethylethylenediamine, and dimorpholine.
According to some preferred aspects of the invention, the chain extender is a combination of one or more selected from the group consisting of clearlink 1000, clearlink3000, jefflink754, jefflink555, jefflink7027 and jeffamin HK-511.
The "amino latent curing agent" in the present invention means a latent curing agent capable of hydrolyzing to release an amino group. According to some specific and preferred aspects of the present invention, the amino-based latent curing agent is a combination of one or more selected from the group consisting of a latent curing agent 401, a latent curing agent 402, and a latent curing agent 403.
The invention provides another technical scheme that: the preparation method of the single-component root penetration resistant waterproof coating comprises the following steps:
(1) dehydrating the polyhydric alcohol and the surface functionalized boron nitride to be below 0.05 percent under the vacuum condition;
(2) mixing and reacting the dried polyol obtained in the step (1), surface functionalized boron nitride, polyisocyanate and a compound shown in a formula (I), adding a chain extender for reaction until the NCO content in reactants reaches a set value, and stopping the reaction to prepare a prepolymer, wherein the set value is 2-5%;
(3) and (3) mixing the prepolymer obtained in the step (2) with the rest raw materials to prepare the single-component root-penetration-resistant waterproof coating.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
the waterproof coating prepared by the method of the invention creatively adopts the compound shown in the formula (I) and the surface functionalized boron nitride to mix and modify the conventional polyurethane molecular structure, the product has higher hard segment content and greatly improved tear resistance, the molecular structures are arranged layer by layer to form a dense membrane block which is airtight like an aluminum foil, excellent root resistance is realized under the condition of not adding a root resistance agent, the puncture of various developed root system plants can be resisted, the strength is high, the elongation is good, meanwhile, the coating has stronger hydrophobic function (can further enhance the waterproof effect of the coating, greatly reduces the water absorption rate) and heat-conducting property (can conduct heat in time, and boron nitride is white and is not easy to absorb heat), can be directly applied to a damp base surface, has good bonding force, meanwhile, the water-proof roof is more excellent in acid resistance, alkali resistance and salt resistance, so that the water-proof roof is particularly suitable for roof planting and water resistance.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples; it is to be understood that these embodiments are provided to illustrate the general principles, essential features and advantages of the present invention, and the present invention is not limited in scope by the following embodiments; the implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not indicated are generally the conditions in routine experiments.
In the following examples, all starting materials are either commercially available or prepared by conventional methods in the art, unless otherwise specified. TDI80 and MDI were purchased from BASF, respectively; polyether 330N, polyether 1000, polyether 2000 were each purchased from eastern cyantran; clearlink 1000, clearlink3000, jefflink754 were purchased from Guangzhou firm; the latent curative 401 is available from hederide.
The surface amination boron nitride adopted in the following is prepared by adopting boron nitride and urea with the feeding mass ratio of 1: 2, and comprises the following specific steps: adding boron nitride and urea into a ball mill under the nitrogen atmosphere, ball-milling for 10h at normal temperature, taking out the ball-milled mixture, washing with deionized water for multiple times, and drying to obtain the surface amination boron nitride.
The surface hydroxylated boron nitride used in the following was prepared by the following method: adding 50g of boron nitride (the purity is more than or equal to 99 percent and the particle size is 2-5 mu m) into a three-mouth reaction bottle, then adding the boron nitride into a prepared 5mol/L sodium hydroxide aqueous solution, mechanically stirring the mixture for 10 hours under the oil bath heating condition at about 100 ℃, washing the obtained mixture with distilled water for multiple times until the filtrate is neutral, and drying the filtrate to obtain the surface hydroxylated boron nitride.
Example 1
The embodiment provides a single-component root-puncture-resistant waterproof coating which comprises the following raw materials: TDI 807 parts, polyether 330N 15 parts, polyether 100015 parts, gamma-aminopropyltriethoxysilane 0.5 parts, surface aminated boron nitride 1 part, clearlink 10002 parts, latent curing agent 4013 parts, filler 30 parts (each of heavy calcium and talcum powder is 50%), DINP 15 parts, and dibutyltin dilaurate 0.1 part.
The preparation method comprises the following steps: performing vacuum dehydration on surface amination boron nitride, polyether 330N and polyether 1000 at 120 ℃ and under the pressure of-0.1 Mpa until the moisture content is lower than 0.05 percent, then adding gamma-aminopropyl triethoxy silicon and TDI80, reacting for 3 hours at 80 ℃, then adding clearlink 1000 for chain extension reaction for 1.5 hours, titrating to the NCO content of 2.5 percent through NCO, stopping the reaction to prepare a prepolymer, then adding a dried and dehydrated filler and the rest raw materials, and mixing to prepare the single-component root-puncture-resistant waterproof coating.
Example 2
The embodiment provides a single-component root-puncture-resistant waterproof coating which comprises the following raw materials: 10 parts of MDI, 20 parts of polyether 330N, 0.5 part of gamma-aminopropyl trimethoxy silane, 1.5 parts of surface aminated boron nitride, 30001 parts of clearlink, 4013.5 parts of latent curing agent, 40 parts of filler (50 percent of each of heavy calcium and talcum powder), 10 parts of DINP and 0.5 part of dibutyltin dilaurate.
The preparation method comprises the following steps: dehydrating surface amination boron nitride and polyether 330N under the conditions of 120 ℃ and 0.1Mpa in vacuum until the moisture content is lower than 0.05 percent, then adding gamma-aminopropyl trimethoxy silicon and MDI, reacting for 3 hours at 80 ℃, then adding clearlink3000 for chain extension reaction for 1.5 hours, titrating the NCO content to 2.8 percent through NCO, stopping the reaction to prepare a prepolymer, then adding a dried and dehydrated filler and the rest raw materials, and mixing to prepare the single-component root-resistant waterproof coating.
Example 3
The embodiment provides a single-component root-puncture-resistant waterproof coating which comprises the following raw materials: TDI 809 parts, polyether 200010 parts, polyether 100018 parts, gamma-aminopropyltriethoxysilane 0.8 parts, surface hydroxylated boron nitride 2 parts, jeffilink 7541.5 parts, latent curing agent 4013 parts, filler 35 parts (50% of each of heavy calcium and talcum powder), DINP 8 parts, and dibutyltin dilaurate 0.3 parts.
The preparation method comprises the following steps: dehydrating surface hydroxyl boron nitride with polyether 2000 and polyether 1000 under vacuum at 120 ℃ and 0.1Mpa until the moisture content is lower than 0.05 percent, adding gamma-aminopropyl triethoxy silicon and TDI80, reacting for 3 hours at 80 ℃, adding jefflink754 for chain extension reaction for 1.5 hours, titrating to NCO content of 3.2 percent through NCO, stopping the reaction to prepare a prepolymer, adding dried and dehydrated filler and residual raw materials, and mixing to prepare the single-component root-penetration-resistant waterproof coating.
Comparative example 1
Essentially the same as example 1, except that no gamma-aminopropyltriethoxysilane was added, the amount of TDI80 added was adjusted accordingly.
Comparative example 2
The difference is essentially the same as in example 1, except that no surface-aminated boron nitride is added and the amount of TDI80 added is adjusted accordingly.
Performance testing
The waterproof coatings prepared in examples 1 to 3 and comparative examples 1 to 2 were subjected to the following performance tests, and the specific results are shown in Table 1.
TABLE 1
The enterprise standard root-crossing-resistant method comprises the following steps:
the coating root penetration resistance test was carried out in a box, and the waterproof coating prepared in the above examples and comparative examples was applied under the roots of plants (pyracantha fortuneana was selected). A sample of the test paint was painted in the test box. The test chamber contains a planting soil layer and a dense plant cover layer, which will generate high growth stress from the roots, which should be properly fertilized and irrigated with water in order to maintain this high growth stress. The test chamber is placed in a temperature-controllable greenhouse, and the growth conditions should be controllable because the environmental conditions have an influence on the growth of plants. Taking 1-2 years as an experimental period, removing the planting soil layer after the experiment is finished, and observing and evaluating whether root puncture occurs in the test paint.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (5)
1. The preparation method of the single-component root penetration resistant waterproof coating is characterized in that raw materials of the waterproof coating comprise polyisocyanate, polyol, a chain extender, an amino latent curing agent, gamma-aminopropyl triethoxysilane and/or gamma-aminopropyl trimethoxysilane and surface functionalized boron nitride, wherein the surface functionalized boron nitride is surface hydroxylated boron nitride and/or surface aminated boron nitride, the feeding amount of the surface functionalized boron nitride accounts for 1-5% of the total feeding amount of the raw materials of the waterproof coating by mass percentage, and the feeding amount of the gamma-aminopropyl triethoxysilane and/or the gamma-aminopropyl trimethoxysilane accounts for 0.5-3% of the total feeding amount of the raw materials of the waterproof coating;
the waterproof coating is prepared by the following method: dehydrating polyol and surface functionalized boron nitride to be below 0.05 percent under the vacuum condition, mixing the polyol, the surface functionalized boron nitride, polyisocyanate and a compound shown in a formula (I) for reaction, adding a chain extender for reaction until the NCO content in reactants reaches a set value, and stopping the reaction to prepare a prepolymer, wherein the set value is 2.5-3.2 percent; and mixing the obtained prepolymer with the rest raw materials to prepare the single-component root penetration resistant waterproof coating.
2. The method for preparing a one-component root penetration resistant waterproof coating material according to claim 1, wherein the raw materials further comprise a filler, a plasticizer, a catalyst and a defoaming agent;
the raw materials comprise, by mass, 5-10 parts of polyisocyanate, 20-30 parts of polyol, 0.5-2 parts of a compound shown in formula (I), 0.5-3 parts of surface functionalized boron nitride, 1-5 parts of a chain extender, 1-5 parts of an amino latent curing agent, 25-45 parts of a filler, 5-15 parts of a plasticizer, 0.1-1 part of a catalyst and 0-1 part of a defoaming agent.
3. The method for preparing the single-component root penetration resistant waterproof coating material according to claim 1, wherein the surface hydroxylated boron nitride is prepared by mixing boron nitride with an aqueous solution of an alkaline hydroxide, and stirring and reacting at a temperature of 90-150 ℃; the surface aminated boron nitride is prepared by the following method: mixing boron nitride with an amino organic compound, and performing ball milling under the atmosphere of inert protective gas to obtain the aminated boron nitride, wherein the amino organic compound is one or more selected from urea, tetraethylenepentamine and triphenylamine.
4. The method for preparing a single-component root penetration resistant waterproof coating material according to claim 2, wherein the polyol is at least one selected from polyether diol, polyester diol and polyether triol; the polyisocyanate is one or a combination of more of diisocyanate and prepolymer thereof, triisocyanate and prepolymer thereof; the filler is one or more of fumed silica, gypsum whisker, nano calcium carbonate, nano aluminum nitride, nano boron nitride, nano aluminum borate, heavy calcium, talcum powder, light calcium, kaolin and wollastonite powder; the plasticizer is at least one selected from DINP, DIDP, chlorinated paraffin, dioctyl adipate, glycol benzoate, trioctyl phosphate and phenyl alkyl sulfonate; the defoaming agent is polysiloxane defoaming agent or the combination of one or more of silicone defoaming agent, calcium oxide, magnesium oxide and calcium hydroxide; the catalyst is at least one selected from dibutyltin dilaurate, stannous octoate, bismuth carboxylate catalysts, zinc naphthenate, pentamethyl dipropylene triamine, tetramethyl ethylene diamine and dimorpholine.
5. The preparation method of the single-component root penetration resistant waterproof coating material as claimed in claim 1, wherein the chain extender is one or more selected from the group consisting of clearlink 1000, clearlink3000, jefflink754, jefflink555, jefflink7027 and jeffamin HK-511; the amino latent curing agent is one or a combination of more selected from the group consisting of a latent curing agent 401, a latent curing agent 402, and a latent curing agent 403.
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| CN112876978B (en) * | 2019-08-02 | 2021-12-24 | 江苏凯伦建材股份有限公司 | Preparation method of single-component root-puncture-resistant waterproof coating |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021022925A1 (en) | 2021-02-11 |
| CN112876978A (en) | 2021-06-01 |
| CN110499096B (en) | 2021-01-05 |
| CN110499096A (en) | 2019-11-26 |
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