Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B16/04—Macromolecular compounds
  • C04B16/06—Macromolecular compounds fibrous
  • C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B16/0641—Polyvinylalcohols; Polyvinylacetates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
  • C04B2111/12—Absence of mineral fibres, e.g. asbestos
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the present invention relates to a hydraulic papermaking board that is a particularly useful building material, and uses non-asbestos hydraulic papermaking board that does not use asbestos, is inexpensive, and is excellent in both interlayer adhesion strength and dimensional stability. About.
• hydraulic paperboard is an excellent building material, but recently, non-asbestos hydraulic paperboard that does not use asbestos is attracting attention, and it is used asbestos. It is considered to be most useful among building materials if it can meet the required performance at a low price as compared with papermaking plates.
• PVA fibers are generally considered to be the most superior in terms of fiber strength, alkali resistance and high affinity with cement. ing.
• Patent Document 1 Japanese Patent Laid-Open No. 59-73463
• Patent Document 2 JP-A-59-203747
• Patent Document 3 Japanese Patent Application Laid-Open No. 59-174553
• Patent Document 4 JP-A-60-5049
• An object of the present invention is a hydraulic papermaking board using a reinforcing fiber as a substitute for asbestos, and a non-asbestos hydraulic papermaking which has excellent lashing strength in terms of interlaminar adhesion strength and dimensional stability without cost increase.
• the purpose is to provide a board (hereinafter, simply referred to as “paper board”).
• the present inventors have used a specific amount of PVA fiber having a specific cross-section degree and eucalyptus rep having a specific beating degree as a reinforcing material.
• the present inventors have found that a papermaking plate excellent in both interlayer adhesion strength and dimensional stability can be obtained.
• the PVA fiber having a cross-section degree of 40 to 70% in the total solid content 1.
• eucalyptus pulp of 0 to 2.0% by mass and freeness of 100 to 500 ml in total solids of 2.0 to 4.0% by mass, each having an interlayer adhesion strength of 2. ON / mm 2 or more and A papermaking board characterized in that the dimensional change rate is 0.25% or less, preferably, the cross-sectional solidity of PVA fibers is 60 to 70%, and the freeness of eucalyptus pulp is 100 to 300 ml.
• the fibers having a small cross-sectional degree of the PVA-based fibers have a flatter shape, and have a high sealing effect when the slurry is made up in the papermaking process, thereby improving the cement yield.
• Eucalyptus pulp which has a smaller fiber diameter than conifers that are commonly used as papermaking pulp, is used in combination with PVA fibers with a low degree of cross-section to provide a more effective sealing effect. The yield is significantly improved. Strength If the cross-section of PVA fiber is too small, the fiber strength will be uneven and the reinforcement will be affected.
• fibers with a high degree of cross-section have a shape closer to a perfect circle, and are uniform and have high fiber strength, so that high reinforcement performance can be obtained.
• the cross-section degree is too large, the sealing effect when making the slurry is low and the cement yield is lowered, and as a result, the interlaminar adhesion strength of the papermaking plate is lowered.
• PVA fiber with a cross-section degree of 40-70% is 1.0 to 2.0% by mass in total solids and a free strength repulp with a freeness of 100 to 500 ml in total solids 2.0 to 2.0% 4. It is necessary to contain 0% by mass.
• the amount of added PVA fiber is less than 1.0% by mass of the total solid content, sufficient reinforcement cannot be obtained, and if it is more than 2.0% by mass of the total solid content, Fiber dispersion becomes difficult, resulting in a non-uniform and faulty papermaking board.
• the freeness of eucalyptus pulp is higher than 500 ml, or when the added amount of eucalyptus pulp is less than 2.0% by mass of the total solid content, the cement yield decreases and the interlayer adhesion strength decreases.
• the freeness of Eucalyptus rep can be as low as 100m, but beating the pulp more than necessary will increase costs.
• the amount of eucalyptus pulp added is more than 4.0% by mass of the total solid content, the water absorption of the papermaking plate increases, resulting in a problem that the dimensional change rate increases.
• the cross-section degree of the PVA fiber is 60 to 70%, the freeness of the eucalyptus pulp is Sl00 to 300 ml, and the content of the eucalyptus pulp is 2.5 to 4. It is preferably 0 mass.
• the cross-section degree of PVA fiber is 40-60%, the freeness of eucalyptus pulp is 200-500 ml, and the content of eucalyptus pulp is 2.0-3. It is preferably 5% by mass. The smaller the degree of cross-section of the PVA fiber, the higher the sealing effect, and it can be used together with eucalyptus pulp that has not been fully beaten.
• the interlaminar adhesion strength referred to in the present invention affects the strength and durability of the papermaking plate, and is measured by the method described later.
• the interlayer adhesion strength of the papermaking board needs to be 2. ON / mm 2 or more.
• the interlayer adhesion strength is less than 2.
• ON / mm 2 delamination occurs remarkably.
• the higher the interlayer adhesion strength the better.
• the interlayer adhesion strength is too high, the papermaking plate itself becomes brittle.
• it is 2.5 N / mm 2 or more, more preferably 3. ON / mm 2 or more 5. ON / mm 2 or less.
• the dimensional change rate of the papermaking board of the present invention is as follows in order to prevent the occurrence of a gap in the joint when used in roofing materials, exterior materials, etc. 25% or less is preferable. Particularly preferred is 0.2% or less, and further preferred is 0.1% or less.
• the fineness of the reinforcing fiber in order to increase the bonding area with the cement and sufficiently exhibit the reinforcing performance, is 0.1 ldtex or more and the fiber length is 2 mm or more.
• the fineness of the reinforcing fiber is preferably 2 Odtex or less and the fiber length is 20 mm or less. That is, the fineness of the reinforcing fiber is preferably 0.:! To 20 dtex, and the fiber length is preferably 2 to 20 mm. More preferably, the fineness of the reinforcing fiber is 1 to 15 dtex and the fiber length is 4 to 15 mm. Two or more kinds of fibers having different fineness and fiber length may be mixed.
• the papermaking plate of the present invention is manufactured by a papermaking method.
• Paper making is a process in which a cage-like material in which cement particles are suspended in an aqueous medium is filtered and formed into a mesh.
• thin films are laminated one after another to form a desired thickness of the circular mesh method (Hachiek method), long mesh method, and once or several times using a concentrated suspension.
• Hachiek method circular mesh method
• the paper making method is mechanically continuous and batch-produced, There is an advantage that uniform and stable performance can be obtained, and a relatively thin material having a thickness of 2 to 30 mm, more preferably 4 to 20 mm can be manufactured. Production of such a thin plate is extremely difficult by ordinary mortar pouring other than papermaking.
• the papermaking plate is manufactured by a method such as a circular net, a long net, and a flow-on, and the material composition thereof is a hydraulic material, reinforcing fiber, pulp, and other additives (inorganic substances, etc.). It is.
• the method for preparing the slurry is not particularly limited. From the viewpoint of obtaining a slurry in which the solid components are uniformly dispersed, the pulp is put into a stirrer filled with water and stirred, and then reinforcing fibers, hydraulic materials, other It is preferable to add the additives sequentially.
• Portland cement is preferably used as the hydraulic material.
• organic fibers are preferably used as the reinforcing fibers.
• the pulp should be used with the beating degree and amount added appropriately controlled.
• Other additives include blast furnace slag, fly ash, calcium carbonate, silica fume, sepiolite, attapulgite, my strength, and wollastonite. These additives have the effect of improving the physical properties of the cured product, for example, improvement of freeze-thaw resistance, suppression of intrusion of corrosive substances (various organic acids such as chlorine and sulfuric acid), improvement of adhesion between reinforcing fibers and matrix, The suspension viscosity is adjusted moderately to increase the efficiency of papermaking, control the drying shrinkage of the papermaking body, and improve the strength of the cured body. There is no problem.
• the fiber fineness, fiber strength, fiber strength, fiber elongation, fiber cross-section solidity, freeness, interlaminar adhesion strength of the papermaking board, and dimensional change rate mean those measured by the following measuring methods. .
• the fiber Itoda denier fiber
• VIBROMAT M manufactured by Textechno.
• the Young modulus has a strength at an elongation of 0.1% at T (cN / dtex) and an elongation of 0.4%.
• T (cN / dtex) is calculated by ⁇ (T -T) / (0. 4-0. 1) ⁇ X 100
• the number of fiber types is n
• the cross-sectional solidity of various fibers is Y (%)
• the mixing ratio of various fibers is Z (%).
• Pulp freeness test method 3 ⁇ 4 [Measured according to the Canadian standard type of IS P8121-1976, and an average value corrected to a slurry concentration of 0.4 mass% and a temperature of 20 ° C. was evaluated as CSF.
• Standard papermaking plate was manufactured by the following standard papermaking method, wrapped in polyethylene sheet, pre-cured for 24 hours at 50 ° C and saturated humidity, and then cured for 13 days at 20 ° C and saturated humidity.
• the sheet After forming 14 sheets of paper on a making roller so that the thickness after curing and humidity control is 6.5 mm ⁇ 0.5 mm, the sheet is formed according to the circular net paper making method by Hachiek, and then the cement sheet is applied to the specified sheet. Cut to size, or press squeeze at a maximum pressure of 7.5MPa, then cut the cement sheet to the specified size.
• Standard papermaking plate was manufactured by the standard papermaking method described above, wrapped in polyethylene sheet, pre-cured for 24 hours at 50 ° C and saturated humidity, and then cured for 13 days at 20 ° C and saturated humidity.
• a sample of 170mm x 50mm size was taken from the test specimen after a day, and JIS
• n 3 or more was measured, and the average value was evaluated as the dimensional change rate.
• NUKP Softwood unbleached pulp
• Eucalyptus pulp was made in Brazil
• polyacrylamide-based cement flocculant was made by Nippon Giken Co., Ltd.
• the papermaking board added with 0 to 3.5% by mass has excellent interlayer adhesion strength and dimensional stability at the same time as the papermaking board containing the pulp of Comparative Examples 1 to 6 that does not satisfy the above range. It will be a thing.
• PVA fibers with a cross-sectional solidity of 56% are 2.0% by mass in total solids, and unipotassium pulp with a freeness of 210 ml is 3.0% by mass in total solids.
• the sheet-made sheet contains an interlayer adhesion strength of 3.2 N / mm 2 and a dimensional change rate of 0.20%.
• the interlaminar adhesion strength of Example 2 is 2.0% by mass of PVA fiber having a cross-sectional solidity of 56% in Comparative Example 6 in total solids, and NU KP having a freeness of 200 ml in total solids 3 . a 4 times higher than in the 0 interlayer adhesion strength 0. 80 N / mm 2 of papermaking plate including mass%. Further, as in Example 1 and Comparative Example 4, a PVA fiber having a cross-section degree of 56% may be added in an amount of 2.0% by mass in the total solid content, and eucalyptus pulp having a freeness of 150 ml may be used.
• Example 4 In Comparative Example 4 in which the amount of eucalyptus pulp added was inappropriate at 4.5% by mass in the total solid content, the dimensional change rate was 0.30%, while the amount of eucalyptus pulp added was 3.5% by mass in the total solid content.
• the dimensional change rate of Example 1 which is appropriate at% is 0.21%, which is 30% smaller than that of Comparative Example 4.
• Example 7 even when the PVA fibers having a cross-section degree of 80% and 34% are each 1.0% by mass in the total solid content (average cross-section degree: 57%), the freeness By using 3.0% by mass of eucalyptus pulp with 210ml of total solid content, a paper-making board with excellent physical properties can be obtained, with an interlayer adhesion strength of 3. ON / mm 2 and a dimensional change rate of 0.21%. . Further, as in Examples 4 to 6, even in a papermaking board containing inorganic particles such as calcium carbonate and fly ash, if the cross-sectional solidity of the PVA fiber is 60 to 70%, this is included in the total solid content. 1.
• eucalyptus pulp of 0 to 2.0 mass% and freeness of 100 to 300 ml to the total solid content of 2.5 to 4.0 mass%, or the cross-section degree of PVA fiber is 40 to 40 If it is 60%, add 1.0 to 2.0% by mass in total solids, and add Eucalyptus pulp with a freeness of 200 to 500ml to 2.0 to 3.5% by mass in total solids. By doing so, excellent interlayer adhesion strength and dimensional stability can be obtained.
• an inexpensive and sufficient interlayer can be obtained by using a specific amount of PVA fiber having a specific cross-section degree and eucalyptus pulp having a specific beating degree. It is possible to ensure adhesion strength and dimensional stability at the same time.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Paper (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

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Citations (6)

• 2005
  • 2005-08-08 BR BRPI0513334A patent/BRPI0513334B1/pt active IP Right Grant
  • 2005-08-08 UA UAA200702524A patent/UA86993C2/ru unknown
  • 2005-08-08 WO PCT/JP2005/014539 patent/WO2006016565A1/ja not_active Ceased

Patent Citations (6)

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