WO2014196789A1 - Composition pulvérulente hydrophobe dispersée dans l'eau et procédé de préparation d'une pâte à papier et d'une fibre de verre l'utilisant - Google Patents

Composition pulvérulente hydrophobe dispersée dans l'eau et procédé de préparation d'une pâte à papier et d'une fibre de verre l'utilisant Download PDF

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Publication number
WO2014196789A1
WO2014196789A1 PCT/KR2014/004940 KR2014004940W WO2014196789A1 WO 2014196789 A1 WO2014196789 A1 WO 2014196789A1 KR 2014004940 W KR2014004940 W KR 2014004940W WO 2014196789 A1 WO2014196789 A1 WO 2014196789A1
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Prior art keywords
water
dispersed
aerogel
composition
hydrophobic
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PCT/KR2014/004940
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English (en)
Inventor
Jeong-Kun Yoo
Doo-Suk PARK
Eun-Yong Lee
Jung-Ho Han
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Remtech Co., Ltd.
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Publication date
Application filed by Remtech Co., Ltd. filed Critical Remtech Co., Ltd.
Priority to CN201480032165.5A priority Critical patent/CN105263991A/zh
Publication of WO2014196789A1 publication Critical patent/WO2014196789A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/24—Coatings containing organic materials
    • C03C25/26—Macromolecular compounds or prepolymers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/24—Coatings containing organic materials
    • C03C25/40—Organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C08K7/26—Silicon- containing compounds
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/022—Emulsions, e.g. oil in water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/56—Foam
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/02—Foams characterised by their properties the finished foam itself being a gel or a gel being temporarily formed when processing the foamable composition
    • C08J2205/026—Aerogel, i.e. a supercritically dried gel

Definitions

  • the present invention relates to a water-dispersed hydrophobic powder composition and a method for preparing a product using the same, and more particularly, to a water-dispersed hydrophobic powder composition in which the properties of the hydrophobic powder may not be affected and a homogeneous water-dispersed state thereof may be maintained for an extended period of time without layer separation occurring, and methods for preparing pulp paper, a pulp board and a glass fiber impregnated with a hydrophobic powder such as aerogel.
  • Hydrophobic materials are often used for insulation, and among hydrophobic materials, aerogel is a typical insulating material.
  • aerogel is a typical insulating material.
  • the use of aerogel throughout a very wide range of industrial fields is insignificant, in spite of excellent insulating performance, sound absorption performance and soundproofing performance thereof.
  • One of the reasons for this is the high cost of aerogel, and another reason is the lack of an application technique therefor, due to the hydrophobicity of aerogel.
  • a material having strong hydrophobicity such as aerogel
  • the insulating properties of an insulating product may be markedly increased, and an application technique thereof is actively used.
  • One of the most difficult tasks in the application technique lies in the difficulty of mixing an insulating material such as aerogel with a water-soluble material due to the hydrophobicity thereof.
  • a large amount of an additive component or an additional process is necessary. This process may be classified as a chemical method in which a surfactant is added and a compulsive physical mixing method.
  • the water-soluble material is required to have a viscosity of a certain degree or higher, and mixing at an appropriate rate according to the viscosity of the water-soluble material is very important.
  • a large amount of a water-soluble material is used, however, when an excessive amount of the water-soluble material is added, insulating effects and soundproofing effects required for an original mixture including aerogel may be markedly deteriorated.
  • the water-dispersed aerogel composition thus obtained is dried, an excessive amount of a binder material may remain, and aerogel powder may agglomerate or solidify due to the adhesiveness thereof, thereby exhibiting markedly higher thermal conductivity when compared to the original state thereof.
  • the hydrophobicity thereof may be significantly decreased, due to a water-soluble binder material, and the inherent function of the aerogel may be markedly lowered.
  • the binder when a fiber or a non-woven fabric is impregnated with the water-dispersed aerogel composition, the binder may be hardened after drying, and the fiber or the non-woven fabric may lose flexibility.
  • silica gel may be impregnated into a non-woven fabric using a silica sol-gel process, and then a super critical process is conducted to dry and produce the aerogel non-woven fabric.
  • a super critical process is conducted to dry and produce the aerogel non-woven fabric.
  • production efficiency may be lowered, and production costs may be increased.
  • an aerogel non-woven fabric may be manufactured by using relatively low-priced aerogel obtained by drying at room temperature.
  • the aerogel non-woven fabric is produced by a method of spraying an aerogel powder during the manufacturing process of the non-woven fabric.
  • the amount of dust generated during the process may be high, aerogel having low gravity may be sprayed into the air, and the non-woven fabric may be impregnated with an insufficient amount of the aerogel.
  • hydrophobic aerogel may be phase separated from a pulp fiber beaten in water, and the manufacturing of the insulating paper using aerogel may be somewhat difficult.
  • Patent Document 1 Korean Patent Application No. 10-2011-0103450
  • An aspect of the present invention provides a water-dispersed hydrophobic powder composition that may maintain a homogeneous water-dispersed state for an extended period of time without layer separation occurring.
  • a water-dispersed hydrophobic powder composition including water, a superabsorbent polymer (SAP) and the hydrophobic powder.
  • SAP superabsorbent polymer
  • the SAP may preferably include at least one selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, cellulose or a derivative thereof, and chitosan, or a salt thereof.
  • a weight ratio of the SAP and the water may preferably be from 1:50 to 1:1,000.
  • a weight ratio of the SAP and the hydrophobic powder may preferably be from 1:10 to 1:500.
  • a viscosity of the water-dispersed hydrophobic powder composition may preferably be from 100 to 200,000 cp.
  • the hydrophobic powder may be at least one selected from the group consisting of a silica aerogel powder, a hydrophobic (Si, Ca, Al, Mg) x O y mineral powder, a surface treated inorganic compound with hydrophobic silane, and a surface treated organic compound with the hydrophobic silane.
  • a method for preparing a water-dispersed composition including preparing an aqueous solution having a gel state by mixing water and a superabsorbent polymer (SAP); and adding a hydrophobic powder and mixing with stirring.
  • the hydrophobic powder is uniformly dispersed in the water-dispersed composition.
  • the stirring may preferably be conducted at a speed of 3,000 to 10,000 rpm when a viscosity of the water-dispersed composition is from 100 to 5,000 cp.
  • the stirring may be conducted at 500 to 3,000 rpm when a viscosity of the water-dispersed composition is greater than or equal to 5,000 cp.
  • a method for manufacturing aerogel pulp paper including mixing a pulp raw material and water and beating; inserting the water-dispersed hydrophobic powder composition and stirring; forming an aerogel pulp slurry by removing moisture; dissociating by mixing the aerogel pulp slurry with water; forming paper; dehydrating; and drying.
  • the pulp raw material may preferably be selected from the group consisting of natural pulp, artificial pulp and recycled pulp.
  • a method for manufacturing an aerogel composite glass fiber including beating by mixing a glass filament having a length of 1 to 100 ⁇ m and water by a weight ratio from 1:70 to 1:150, adding 0.01 to 0.10 parts by weight of a dispersing agent with respect to 1 part by weight of the glass filament, and mixing; inserting the water-dispersed hydrophobic powder composition stirring; stabilizing by mixing 500 to 1,000 parts by weight of water with respect to 1 part by weight of the glass filament and stirring; molding the composition thus stabilized to a thickness of 5 to 30 mm; dehydrating; and drying.
  • a hydrophobic powder may be dispersed very stably, and a water-dispersed composition having good dispersibility may be obtained. Phase separation may not be generated for an extended period of time in the water-dispersed composition of the present invention.
  • a superabsorbent polymer SAP
  • the amount of the SAP is very small when considering the amount of a mixing agent as a general binder, and the volume of the SAP is very small, the physical properties and the characteristics of the hydrophobic powder may only be slightly affected.
  • FIG. 1(a) is a photographic image in which a hydrophobic aerogel powder is dispersed in a water-dispersed composition prepared in Example 1
  • FIG. 1(b) is a photographic image in which hydrophobic aerogel and water are not mixed and separated in a water-dispersed composition prepared in Comparative Example 2;
  • FIG. 2(a) is a scanning electron microscope (SEM) image of the inner portion of hanji (traditional Korean paper handmade from mulberry trees) of a mulberry fiber manufactured by using a water-dispersed aerogel composition prepared in Preparation Example 2
  • FIG. 2(b) is a photographic image illustrating the hydrophobicity of hanji of a mulberry fiber manufactured using a water-dispersed aerogel composition prepared in Preparation Example 2;
  • FIG. 3 is a SEM image of the inner portion of a composite glass fiber manufactured using a water-dispersed aerogel composition prepared in Preparation Example 3;
  • FIG. 4(a) is a photographic image illustrating the hydrophobicity of a composite glass fiber prepared in Preparation Example 3
  • FIG. 4(b) is a photographic image illustrating the flameproof properties of a composite glass fiber manufactured in Preparation Example 3;
  • FIG. 5(a) is a photographic image illustrating the hygroscopicity of a general wet glass fiber excluding aerogel
  • FIG. 5(b) is a photographic image of a general wet glass fiber melt by flame
  • FIG. 6(a) is a photographic image illustrating the hydrophobicity of an aerogel recycled pulp board manufactured in Preparation Example 5
  • FIG. 6(b) is a photographic image illustrating the durability (flameproof properties) of an aerogel recycled pulp board manufactured in Preparation Example 5.
  • a water-dispersed hydrophobic powder composition including water, a superabsorbent polymer (SAP) and a hydrophobic powder is provided.
  • SAP superabsorbent polymer
  • a water-dispersed composition having high viscosity may be prepared using a minimum amount of the SAP as a viscosity increasing agent of an aqueous solution and obtaining a water-dispersed solution of a hydrophobic powder.
  • the water-dispersed solution of the present invention has a dispersed state of a trace amount of the SAP when considering the amount of the hydrophobic powder, and the properties of the hydrophobic powder may be maintained as it stands when dried again after being applied in each field.
  • the hydrophobic powder when the hydrophobic powder is aerogel, the bulk density thereof is very small and a smaller amount of the aerogel by volume may be mixed.
  • the insulating properties, the hydrophobic properties of the aerogel may be maintained when dried again after being applied in each field.
  • application for the manufacture of an aerogel impregnated non-woven fabric, an aerogel impregnated hanji, pulp, a glass fiber composite, or the like may be expected.
  • the SAP of the present invention When mixed with water, the SAP of the present invention may absorb the water and swell to undergo gelation.
  • the SAP may absorb water by 1,000 times of the weight thereof, and a gel state having high viscosity may be maintained.
  • a trace amount of the SAP may remain as a solid state after drying water. Thus, the properties of the hydrophobic powder may not be affected.
  • the SAP used in the present invention may include at least one component selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, cellulose or a derivative thereof, and chitosan, or a salt thereof.
  • polyacrylic acid or a salt thereof may be used.
  • sodium polyacrylate is a salt of polyacrylic acid, a white powder, a material having no smell and no taste, a polymer of sodium acrylate, and hydrophilic, and has high hygroscopicity.
  • the sodium polyacrylate is slowly dissolved in water to form a solution having a transparent gel state and high viscosity.
  • the high viscosity is attained due to the ionic phenomenon of a plurality of anions in a molecule, and apparent viscosity is high.
  • the solution having high viscosity may be formed with a small amount of sodium polyacrylate.
  • the solution Since the solution has high heat-resistance and may not be decomposed up to 300°C, deteriorating phenomenon may hardly occur, and so, the solution may be used in a food requiring heat treatment. In addition, the solution may not be decomposed or spoiled, and good storage properties may be obtained.
  • acrylic acid or acrylic ester undergoes saponification by sodium hydroxide to form an acrylic acid exclusively, and the acrylic acid is concentrated while removing produced alcohols.
  • concentration of the sodium acrylate monomer thus concentrated is controlled, pH thereof is adjusted using sodium hydroxide, and ammonium persulfate is added as a polymerization catalyst for polymerization.
  • the polymer thus obtained has a gel phase, and sodium polyacrylate may be obtained by drying, grinding and sieving.
  • Cellulose or the derivative thereof may include modified cellulose in which a hydrogen bond is formed between -OH functional groups of the cellulose such as nitrocellulose, acetic acid cellulose, carboxymethyl cellulose, or the like.
  • the SAP used in the present invention is not limited to the materials having the above-described components.
  • a SAP having water absorbing power of greater than or equal to 50 g/g may be used, and a SAP having water absorbing power from 50 to 1,000 g/g may preferably be used. More preferably, a SAP having water absorbing power from 300 to 500 g/g may be used.
  • the SAP When the water absorbing power of the SAP is less than 50 g/g, water absorbing power is insufficient, and a large amount of the SAP may be necessary. Thus, the SAP may remain and affect the final physical properties of the hydrophobic powder.
  • the weight ratio of the SAP and water is 1:50 to 1:1,000.
  • the amount of the SAP is less than the lower limit, the amount of the SAP is excessively small when compared to the amount of water, and the desired viscosity of the aqueous solution (gel) may not be obtained.
  • the amount of the SAP exceeds the upper limit, the amount of the SAP is excessive, and the viscosity of the aqueous solution (gel) may be too high. In this case, the mixing with a hydrophobic powder may be difficult.
  • the weight ratio of the SAP and water is from 1:100 to 1:500.
  • the weight ratio of the SAP and the hydrophobic powder is preferably from 1:10 to 1:500, and is more preferably from 1:100 to 1:200.
  • the amount of the hydrophobic powder is less than the lower limit, the amount of the hydrophobic powder in the aqueous mixture solution is too small, and the realization of the properties of the hydrophobic powder may be inefficient.
  • the amount of the hydrophobic powder exceeds the upper limit, the volume of the hydrophobic powder is excessively increased, and a composition having a desired state such as a flowable gel or a liquid state in which the hydrophobic powder is uniformly dispersed may be hardly obtained.
  • the average diameter of the hydrophobic powder used in the present invention is preferably from 0.001 mm to 5 mm, and is more preferably from 0.01 mm to 0.15 mm.
  • the use of the hydrophobic powder having an average particle diameter of 0.001 mm to 5 mm is preferable when considering the controlling of viscosity, the amount of mixing and the possibility of uniform mixing.
  • the viscosity of the water-dispersed hydrophobic powder composition is preferably from 100 to 200,000 cp, and is more preferably from 1,000 to 20,000 cp.
  • the viscosity is less than 100 cp, the phase of the aerogel and moisture may be separated, and when the viscosity exceeds 200,000 cp, the viscosity may be excessively high, and the stirring may be difficult.
  • the hydrophobic powder is at least one selected from the group consisting of a hydrophobic silica aerogel powder, a hydrophobic (Si, Ca, Al, Mg) x O y mineral powder, a surface treated inorganic compound with hydrophobic silane, and a surface treated organic compound with hydrophobic silane.
  • the silica aerogel powder used in the present invention may include all kinds of aerogel powders in which the porous surface of the aerogel is modified into hydrophobic, and may be any hydrophobic silica aerogel powder known in this art, without specific limitation.
  • the hydrophobic silica aerogel means surface treated silica aerogel to have hydrophobicity.
  • the hydrophobic surface treatment may be conducted by any method known in this art.
  • treated silica aerogel by silylation, or the like may be used.
  • the hydrophobic (Si, Ca, Al, Mg) x O y mineral powder means a hydrophobic mineral powder such as CaO, MgO, Al 2 O 3 , or the like, and a compound may be obtained through composing each component within the range of x from 1 to 9 and y from 1 to 9.
  • a water-dispersed hydrophobic powder composition including water, a SAP and a hydrophobic powder additionally includes a binder, or the like
  • a composition for coating that may be appropriately coated or used for the formation of a coating layer may be formed.
  • an organic binder, an inorganic binder or a combination thereof may be additionally added, without limitation.
  • the organic binder may preferably be selected from the group consisting of polyvinyl alcohol (PVA), polyurethane, acrylate, cellulose, epoxy, a phenol resin, a silicon resin, latex, starch, ethylene vinyl acetate (EVA), polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC), and the inorganic binder may preferably be selected from the group consisting of water glass, cement, red clay and a phosphate binder.
  • PVA polyvinyl alcohol
  • EVA ethylene vinyl acetate
  • PE polyethylene
  • PP polypropylene
  • PVC polyvinyl chloride
  • the binder is preferably included by 1 to 1,000 parts by weight based on 100 parts by weight of the water-dispersed composition.
  • the water-dispersed hydrophobic powder composition may additionally include an alcohol, and a mixture of water and the alcohol may be used.
  • the amount of the alcohol may be from 0.001 to 1 parts by weight based on 1 part by weight of water.
  • the alcohol may preferably be added when the viscosity of the water-dispersed composition is less than 1,000 cp.
  • the water-dispersed hydrophobic powder composition may be used for the effective impregnation of a fiber, paper, other porous material, or the like with aerogel.
  • the above-described organic binder, the inorganic binder, or a combination thereof may be included to impart additional functions.
  • the water-dispersed hydrophobic powder composition of the present invention may additional include at least one additive selected from the group consisting of a surfactant, an inorganic filler, a curing agent, a viscosity increasing agent, and a defoamer.
  • the surfactant may be additionally added so that the hydrophobic aerogel is mixed well with other components as occasion demands.
  • any surfactant known in this art may be used.
  • alcohols such as ethanol, polyethylene glycol (PEG), or the like may be used alone or as a combination thereof, without limitation.
  • the inorganic filler may be additionally added considering the economic feasibility and the tolerance on the temperature.
  • the inorganic filler may be any inorganic filler known in this art.
  • a red clay powder, mica, talc, silica, diatomite, perlite, vermiculite, activated carbon, zeolite, hollow ceramic, hollow silicate, or the like without limitation.
  • These inorganic fillers may be used alone or as a combination thereof.
  • the inorganic filler When the inorganic filler is used, the insulating properties of the insulating composite may be deteriorated when compared to a case including only the hydrophobic aerogel. Thus, the separate addition of the inorganic filler is not preferable when considering insulating properties. However, the inorganic filler may be used when considering economic feasibility.
  • the other additive is preferably added by 0.01 to 100 parts by weight based on 100 parts by weight of the water-dispersed composition.
  • the water-dispersed composition of the present invention as described above may be prepared by including a step of preparing an aqueous solution having a gel state by mixing water and a SAP, and a step of adding a hydrophobic powder and mixing with stirring.
  • a water-dispersed composition in which a hydrophobic powder is uniformly dispersed may be obtained by the above-described method.
  • the stirring during the preparation of the water-dispersed composition of the present invention is preferably conducted at from 3,000 to 10,000 rpm, preferably greater than 3,000 to 10,000 rpm, when the viscosity of the water-dispersed composition is from 100 to less than 5,000 cp.
  • the stirring is preferably conducted from 500 to 3,000 rpm. In this case, the stirring is preferably conducted for at least 3 seconds.
  • the rpm may be higher or the mixing time may be longer than the above-described ranges, however, in the case when the rpm is less than the lower limit of the above-described range, the stirring may become difficult.
  • the hydrophobic powder is very stably dispersed and a dispersed composition having good dispersibility may be obtained.
  • the phase separation may not occur for an extended period of time.
  • only the hydrophobic powder and a trace amount of the SAP may remain after drying the water-dispersed hydrophobic powder composition. Since the amount of the SAP is very small when compared to a common mixing agent as a binder by the weight and is extremely small when considering the volume, the physical properties and the characteristics of the hydrophobic powder may be hardly affected.
  • a coating or a coating layer having improved properties may be easily manufactured by including the hydrophobic powder such as aerogel.
  • the hydrophobic powder may generate dusts during handling, however, this defect may be solved using the water-dispersed hydrophobic powder composition.
  • the water-dispersed hydrophobic powder composition of the present invention may be applied in various fields.
  • the weight of the SAP may be very small when compared to the amount of the hydrophobic powder or the binder.
  • the physical properties of the hydrophobic powder or the binder, or a final product including thereof may be hardly affected.
  • the above-described method is different from the concept of mixing an organic-inorganic binder with common aerogel.
  • the mixing of the common aerogel with a binder is conducted for imparting adhesiveness to a specific object by mixing the aerogel with the binder, and some amounts of the binder may preferably remain after drying for attaining the adhesiveness.
  • a relatively very small amount of the SAP is added in water to increase the viscosity of water. With water having increased viscosity, the hydrophobic aerogel may be mixed. This composition may be usefully used when the power state of original aerogel is necessary so as to eliminate the effect of the SAP.
  • the amount of the SAP is decreased in the present invention.
  • the amount of the SAP is as small as possible only if minimum viscosity may be imparted, and the aerogel may be dispersed in water.
  • the amount of the SAP is very small, and very similar thermal conductivity as the inherent thermal conductivity of the aerogel may be shown.
  • the inherent hydrophobicity of the aerogel may be maintained.
  • the water-dispersed aerogel of the hydrophobic powder when the water-dispersed aerogel of the hydrophobic powder is sprayed during manufacturing a non-woven fabric, dusts may not be generated and the non-woven fabric may be impregnated with a sufficient amount of aerogel. Through the above-described process, the manufacturing cost of the aerogel non-woven fabric may be markedly lowered.
  • the water-dispersed aerogel may be applied in other fiber such as a paper fiber, a wood material, or the like.
  • pulp paper may be manufactured using the water-dispersed aerogel composition of the present invention.
  • This method includes, a beating step, a mixing step of a water-dispersed aerogel composition, a moisture removing step, a dissociating step, a paper forming step, a compressing and dehydrating step and a drying step.
  • a method for manufacturing aerogel pulp paper may include a beating step including mixing a pulp raw material and water and beating; a stirring step after inserting the water-dispersed hydrophobic powder composition; a forming step of an aerogel pulp slurry by removing moisture; a dissociating step by mixing the aerogel pulp slurry with water; a paper forming step; a dehydrating step; and a drying step.
  • the pulp may include all of natural pulp, synthetic pulp and recycled pulp, and may further include hanji and a wide scope of pulps using various pulp raw materials applicable in this art without limitation.
  • the pulp raw material may be selected from the group consisting of natural pulp, artificial pulp and recycled pulp.
  • mulberry trees may be used as a raw material for the manufacture of the hanji.
  • the manufacturing process of the aerogel pulp paper will be particularly explained referring to a manufacturing process of aerogel hanji using mulberry trees.
  • mulberry trees and water are inserted in a beater and refluxed for 30 minutes to 1 hour to conduct beating until a stage just prior to when a mulberry fiber gets entangled.
  • the present invention is not limited to the beating method, and any method conducted in this art may be used.
  • one to ten times of water of the weight of the mulberry trees is used in the beating step.
  • the mulberry trees are used after finishing preprocessing such as washing, drying, or the like, and the white skin of the mulberry trees is more preferably used.
  • the stirring step after inserting the water-dispersed hydrophobic powder composition of the present invention is a step of entangling fibers while distributing the mulberry trees and the hydrophobic aerogel uniformly by inserting the water-dispersed composition of the present invention into a reactor undergoing the beating and stirring.
  • silica aerogel is completely impregnated between the mulberry fibers through the beating process and the mixing process of the water-dispersed aerogel composition, the refluxing and stirring are stopped, and the moisture is naturally removed from the mulberry fiber to obtain a slurry state.
  • the moisture removing process is conducted for removing water.
  • the aerogel mulberry fiber of the slurry state is inserted into a paper case, and the dissociating step is conducted while stirring with water sufficiently.
  • the paper forming process is conducted.
  • an adhesive including a hibiscus as a main component is floated in water, and a woven structure for forming paper is swayed to the front and the back and to the left and the right, thereby fibers lost the elasticity thereof by water may be entangled from each other.
  • the hanji and water scooped by the weave structure most of water is removed through the weave structure.
  • the present invention is not limited to the above-described paper forming method, and any method applied in this art may be used.
  • the hanji shape is separated from the weave structure and stacked.
  • the water remaining in the hanji may be compressed and dehydrated.
  • the paper forming process may correspond to a manufacturing process of papers by mixing the water-dispersed aerogel composition and recycled pulp fiber and compressing for dehydration.
  • a general filler, a pigment and/or a dye may be additionally mixed, and a refining process for evensizing fibers and a selecting process for removing foreign materials may be additionally included.
  • the recycled pulp paper from which most of the moisture was removed may be compressed and dehydrated to remove remaining water in the recycled pulp paper by applying loads using a press.
  • an aerogel pulp board may be manufactured.
  • the hanji shape after conducting the compressing and dehydrating is suspended on a drying rack and naturally dried in a well ventilated space to manufacture hanji of an aerogel mulberry fiber.
  • the thickness of the hanji of the aerogel mulberry fiber is from about 1.5 mm to about 2.0 mm.
  • the drying method is not specifically limited to the natural drying, and the drying may be compulsively conducted in a convection type hot air drying apparatus.
  • a sizing step may be additionally conducted according to the kind of the pulp raw material. That is, in recycled pulp having strong hygroscopicity, a waterproof colloidal material is mixed to fill up gaps on the surface of a fiber or between fibers, to smoothen the surface of the pulp paper.
  • an additive for this purpose is called as a sizing agent.
  • a "surface sizing” method by which paper is formed and then the sizing agent is coated, and an “engine sizing” method by which a beating step is conducted, and a sizing agent is added in the pulp before and after the beating to coat the surface of individual fiber, may be exemplified.
  • the sizing agent used in the sizing step may include a rosin soap, rosin, gelatin, a petroleum resin, an alum cake, wax, or the like.
  • the sizing method and the sizing agent are not limited thereto, and any sizing agent and sizing method used in this art may be applied.
  • a composite glass fiber may be manufactured using the water-dispersed aerogel composition of the present invention.
  • This method may include a beating step, a mixing step of a water-dispersed aerogel composition, a stabilizing step, a molding step and a drying step.
  • the drying step may include a moisture removing step and a final drying step. Particulars of each process are as follows.
  • a beating process is conducted by inserting a glass filament having a length of 1 to 100 ⁇ m with water by the weight ratio of from about 1:70 to about 1:150 in a mixing tank, inserting a small amount of a dispersing agent, and stirring.
  • a stirrer may be used.
  • the dispersing agent is preferably added by 0.01 to 0.10 parts by weight with respect to 1 part by weight of the glass filament.
  • the glass filament may be entangled and may not be dispersed.
  • at least one dispersing agent is preferably added.
  • the preferable dispersing agent may be at least one selected from the group consisting of polyethylene oxide, a polyethylene derivative and sulfuric acid (H 2 SO 4 ).
  • the water-dispersed hydrophobic powder composition of the present invention is inserted in the mixture tank undergoing the beating process, followed by stirring to uniformly distribute the glass filament and the hydrophobic aerogel.
  • the hydrophobic powder and the water-dispersed composition may preferably be inserted by the amount of 0.01 to 10 parts by weight with respect to 1 part by weight of the glass filament.
  • the glass filament, water, and the water-dispersed hydrophobic powder composition were mixed, and 500 to 1,000 parts by weight of water with respect to 1 part by weight of the glass filament was mixed therewith, followed by stirring for stabilization.
  • This stabilizing step may be conducted after conducting a filtering step for removing foreign materials. Through this process, the glass filament and the water-dispersed hydrophobic powder may be completely mixed.
  • the mixture thus obtained may be molded in an appropriate thickness.
  • the mixture is transferred to a molder via pumping, and a composite glass fiber shape may be formed using a molding pressurizing plate of the molder.
  • the mold may be formed to a thickness of 5 mm to 15 mm.
  • the molding may be conducted to a thickness of 16 mm to 30 mm.
  • the stabilized composition may be molded to a thickness of 5 mm to 30 mm as occasion demands.
  • the composite glass fiber molded using the pressurizing plate may be produced in a similar state as sol.
  • moisture may be removed using a minute filtering net or a filtering plate.
  • the moisture removing time may be markedly decreased using a decompression apparatus.
  • the moisture may be removed using an upper dehydration apparatus with pressure as occasion demands.
  • the composite glass fiber was completely dried and an aerogel composite glass fiber having a sheet of a solid state may be manufactured.
  • aqueous solution having a gel state In 100 g of water, 1 g of a SAP (HI-SWELL, manufactured by Songwon Industrial Co.) was mixed to prepare an aqueous solution having a gel state. In this case, the viscosity of the aqueous solution of the gel state measured using a viscometer (SV-10kv, manufactured by AND Co., Ltd.) was 1,300 CP.
  • a viscometer SV-10kv, manufactured by AND Co., Ltd.
  • a water-dispersed hydrophobic powder composition was prepared by conducting the same procedure described in Example 1 except that a hollow silicate (bulk density of 0.04 and an average particle size of 40 ⁇ m) as an inorganic filler was additionally added. The viscosity was measured using the same apparatus in Example 1 and was 1,500 CP.
  • Example 2 The same procedure in Example 1 was conducted except that 200 g of water and 5 g of a SAP were mixed, and 2 g of a CaO mineral powder having the hydrophobicity was additionally mixed in the aqueous solution thus obtained to prepare a water-dispersed hydrophobic powder composition.
  • the viscosity was measured using the same apparatus in Example 1 and was 1,300 CP.
  • Example 2 The same procedure in Example 1 was conducted except that 200 g of water and 400 g of a SAP were mixed to prepare a water-dispersed aerogel composition.
  • Comparative Example 1 the amount of the SAP was excessive, and a liquid phase was not obtained. Thus, the mixing of an aerogel powder with the composition was impossible.
  • the composition thus obtained was coated on a steel plate to a thickness of 2 mm.
  • the coating layer thus formed had good adhesiveness to a steel plate after drying, and it was secured that hydrophobicity by the aerogel was good.
  • the temperature of the steel plate was kept to 150°C, and the composition thus obtained was coated to a thickness of 2 mm. It was secured that the temperature of the upper portion of the coated surface was 79°C, and insulating properties were realized.
  • Comparative Preparation Example 1 Aqueous solution using an aerogel powder and manufacture of a coating layer using the same
  • the method for manufacturing hanji of a mulberry fiber using the water-dispersed aerogel composition of the present invention mainly includes a beating process, a mixing process of a water-dispersed aerogel composition, a moisture removing process, a dissociating process, a paper forming process, a compressing and dehydrating process, and a drying process. Particulars of each process are as follows.
  • Example 1 of the present invention 100 kg of the water-dispersed aerogel composition prepared in Example 1 of the present invention was inserted in a reactor undergoing the beating process, followed by stirring to uniformly distribute the mulberry fiber and the hydrophobic aerogel and to entangle fibers.
  • the aerogel mulberry fiber having the slurry state through the moisture removing process was inserted in a paper case and sufficiently stirred with water for uniform mixing.
  • An adhesive including a hibiscus was floated in water, and a woven structure for forming paper was swayed to the front and the back and to the left and the right, thereby fibers lost the elasticity by water was entangled from each other.
  • a woven structure for forming paper was swayed to the front and the back and to the left and the right, thereby fibers lost the elasticity by water was entangled from each other.
  • hanji and water scooped by the weave structure most of water was removed through the weave structure.
  • the hanji shape from which most of water was removed through the paper forming process was separated from the weave structure and stacked by 10 sheets. Loads were applied using a press, and moisture remaining in the hanji was compressed and dehydrated.
  • the compressed and dehydrated hanji shape was suspended on a drying rack and naturally dried in a well ventilated space to manufacture hanji of an aerogel mulberry fiber having a thickness of from about 1.5 mm to about 2.0 mm.
  • the method of manufacturing a composite glass fiber by a wet method using the water-dispersed aerogel composition of the present invention mainly includes a beating process, a mixing process of a water-dispersed aerogel composition, a stabilizing process, a molding process, a moisture removing process, and a drying process. Particulars of each process are as follows.
  • This process corresponds to a process for completely mixing the glass filament and the water-dispersed hydrophobic aerogel.
  • the completely mixed mixture was transferred to a molder via pumping, and the shape of a composite glass fiber was formed using a molding pressurizing plate.
  • the composite glass fiber molded using the pressurizing plate was produced in a similar state as sol. In this state, remaining water was removed using a minute filtering net or a filtering plate.
  • the composite glass fiber after removing the moisture was transferred to a drying room and dried to obtain an aerogel composite glass fiber of a sheet having a solid state.
  • the method of manufacturing recycled pulp paper using the water-dispersed aerogel composition of the present invention mainly includes a beating process, a mixing process of a water-dispersed aerogel composition, a moisture removing process, a dissociating process, a paper forming process, a compressing and dehydrating process, and a drying process. Particulars of each process are as follows.
  • the sizing was conducted by an engine sizing method using 500 g of gelatin.
  • Example 1 of the present invention 100 kg of the water-dispersed aerogel composition prepared in Example 1 of the present invention was inserted in a reactor undergoing the beating process, followed by stirring to uniformly distribute the recycled pulp paper and the hydrophobic aerogel.
  • the aerogel recycled pulp paper having the slurry state through the moisture removing process was inserted in a paper case and sufficiently stirred with water for uniform mixing.
  • a paper forming process is a process of manufacturing papers by compressing and dehydrating a mixture of the water-dispersed aerogel composition and the recycled pulp paper fiber. To the recycled pulp paper from which most of water was removed through the paper forming process, loads were applied using a press to compress and dehydrate moisture remained in the recycled pulp paper.
  • the compressed and dehydrated recycled pulp paper was dried in a well ventilated drier at 130°C for 4 hours to manufacture an aerogel recycled pulp paper having a thickness of from about 3.5 mm to about 5.0 mm.
  • the method of manufacturing a recycled pulp board using the water-dispersed aerogel composition of the present invention mainly includes a beating process, a mixing process of a water-dispersed aerogel composition, a moisture removing process, a dissociating process, a compressing and dehydrating process, and a drying process like the preceding.
  • a board is manufactured by increasing the thickness of the pulp than paper and is easily applicable to a product having improved insulating and sound absorption effect.
  • Example 1 of the present invention 100 kg of the water-dispersed aerogel composition prepared in Example 1 of the present invention was inserted into a reactor undergoing the beating process, followed by stirring to uniformly distribute the recycled pulp paper and the hydrophobic aerogel.
  • the aerogel recycled pulp paper having the slurry state through the moisture removing process was inserted in a paper case and sufficiently stirred with water for uniform mixing.
  • the mixture of the water-dispersed aerogel composition and the recycled pulp paper fiber was filled in a mold having a certain shape and compressed and dehydrated to manufacture an aerogel pulp board. Loads were applied using a press to the recycled pulp paper mixed with the water-dispersed aerogel to compress and dehydrate the moisture remaining in the recycled pulp paper.
  • the compressed and dehydrated recycled pulp board was dried in a well ventilated drier at 150°C for 10 hours to manufacture an aerogel recycled pulp board having a thickness of from about 35 mm to about 50 mm.
  • Example 1 The water-dispersed compositions of the hydrophobic powder of the present invention obtained in Example 1 and Comparative Example 2 were left for 2 weeks at room temperature, and the results were confirmed.
  • the minute tissue of a hanji specimen of a mulberry fiber manufactured in Preparation Example 2 was observed using a scanning electron microscope. It could be confirmed that silica aerogel particles composing a composite sheet according to the present invention were uniformly distributed between mulberry fibers as in FIG. 2(a).
  • the thermal conductivity of the hanji specimen of a mulberry fiber manufactured in Preparation Example 2 was measured in Korea Conformity Laboratories (KCL). The thermal conductivity was about 0.022 w/mk and showed excellent insulating properties.
  • hanji of a mulberry fiber manufactured by a wet method using the water-dispersed aerogel according to the present invention showed very strong hydrophobicity with respect to water as in FIG. 2(b).
  • the thermal conductivity of the composite glass fiber specimen manufactured in Preparation Example 3 was measured in Korea Conformity Laboratories (KCL). The thermal conductivity was about 0.023 w/mk and showed excellent insulating properties.
  • the glass fiber manufactured in Preparation Example 3 showed strong hydrophobicity after drying as confirmed in FIG. 4(a).
  • the durability to flame of an original glass fiber was increased even more by the uniformly impregnated silica aerogel particles by the water-dispersed aerogel, and the glass fiber was not melt by the exposure to flame for greater than or equal to 1 minute as shown in FIG. 4(b).
  • a common glass fiber having a thickness of 1 mm was not hydrophobic as shown in FIG. 5(a), and was melt by the flame of 1,100°C within 10 to 20 seconds to form a hole as shown in FIG. 5(b).
  • the thermal conductivity of the recycled pulp paper manufactured in Preparation Example 4 was measured in Korea Conformity Laboratories (KCL). The thermal conductivity was about 0.023 w/mk and showed excellent insulating properties.
  • the thermal conductivity of the recycled pulp paper manufactured in Preparation Example 5 was measured in Korea Conformity Laboratories (KCL). The thermal conductivity was about 0.023 w/mk and showed excellent insulating properties.

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Abstract

Cette invention concerne une composition pulvérulente hydrophobe dispersée dans l'eau comprenant de l'eau, un polymère superabsorbant (SAP) et une poudre hydrophobe. La composition dispersée dans l'eau comprend une poudre hydrophobe dispersée de manière stable qui permet d'obtenir une bonne dispersibilité. La séparation des phases peut ne pas survenir dans la composition dispersée dans l'eau pendant une période de temps prolongée. De plus, après séchage de la composition pulvérulente hydrophobe dispersée dans l'eau, seules la poudre hydrophobe et une petite quantité de SAP subsistent. Etant donné que la quantité de SAP est très petite lorsque l'on considère un agent de mélange courant à titre de liant, et est très petite lorsque l'on considère son volume, les propriétés physiques et les caractéristiques de la poudre hydrophobe peuvent s'avérer difficiles à affecter.
PCT/KR2014/004940 2013-06-05 2014-06-03 Composition pulvérulente hydrophobe dispersée dans l'eau et procédé de préparation d'une pâte à papier et d'une fibre de verre l'utilisant WO2014196789A1 (fr)

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CN116041030A (zh) * 2022-12-05 2023-05-02 湖南泓盛新型建材有限公司 一种透水混凝土砌块及其制备方法

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KR101745410B1 (ko) 2015-05-12 2017-06-09 엘지전자 주식회사 고분자 기반 초흡습성 코팅 조성물 및 그 이용
EP3418255A4 (fr) * 2016-02-15 2019-02-27 Panasonic Intellectual Property Management Co., Ltd. Procédé de traitement hydrophobe et procédé de fabrication d'élément en forme de feuille utilisant le procédé
CN106432754B (zh) * 2016-09-09 2019-05-21 齐鲁工业大学 一种纤维和颗粒的湿法分散、成型方法
WO2018221987A1 (fr) * 2017-05-31 2018-12-06 알이엠텍 주식회사 Feuille d'aérogel et matériau d'isolation la comprenant

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