US20130011641A1 - Melamine Decorative Board - Google Patents

Melamine Decorative Board Download PDF

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Publication number
US20130011641A1
US20130011641A1 US13/635,246 US201113635246A US2013011641A1 US 20130011641 A1 US20130011641 A1 US 20130011641A1 US 201113635246 A US201113635246 A US 201113635246A US 2013011641 A1 US2013011641 A1 US 2013011641A1
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Prior art keywords
resin
layer
melamine
decorative board
paper
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Abandoned
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US13/635,246
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English (en)
Inventor
Nobumitsu Miyazaki
Tomoya Ogino
Koushi Suzuki
Koutarou Kodera
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Aica Kogyo Co Ltd
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Aica Kogyo Co Ltd
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Assigned to AICA KOGYO CO., LTD. reassignment AICA KOGYO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KODERA, KOUTAROU, MIYAZAKI, NOBUMITSU, OGINO, TOMOYA, SUZUKI, KOUSHI
Publication of US20130011641A1 publication Critical patent/US20130011641A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/42—Layered products comprising a layer of synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
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    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/06—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/04—Layered products comprising a layer of synthetic resin as impregnant, bonding, or embedding substance
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    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
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    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/028—Paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/02—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/04—Time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B32B2317/122—Kraft paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B32B2317/125—Paper, e.g. cardboard impregnated with thermosetting resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2451/00—Decorative or ornamental articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2509/00—Household appliances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2607/00—Walls, panels
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24934—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including paper layer

Definitions

  • the present invention relates to a melamine decorative board.
  • a melamine decorative board is produced with a melamine resin-impregnated paper as a decorative layer, a phenol resin-impregnated paper as a core layer, and a backside paper as needed.
  • dark brown color of phenol in the core layer is noticeable when such a melamine decorative board is bonded onto a top board for a table, a counter, a desk, or the like.
  • a resin-impregnated paper which is produced by impregnating melamine resin into a whitish fibrous base material with less ash content, as a core layer.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2008-073979
  • Patent Document 2 Japanese Unexamined Patent Application Publication N. 2002-212389
  • Patent Document 3 Japanese Unexamined Patent Application Publication No. 2001-001480
  • the core layer Since the whitish fibrous base material with less ash content is used for the core layer, when a decorative board, in which a decorative paper colored softly and lightly with white, yellow, or the like is used for a decorative layer, is bonded onto a core member such as a plywood, a particle board, a steel board, color tone of the core member is seen through and faintly appears on a surface of the decorative board, thereby to affect the original color tone of the decorative layer in some cases.
  • a core member such as a plywood, a particle board, a steel board
  • a thickness of the decorative board is adjusted to be between 0.6 mm and 1.8 mm as appropriate by changing the number of sheets resin-impregnated core paper used as the core layer, a balance of cure shrinkage between the core layer and the decorative layer becomes easily deteriorated when the number of the sheets is smaller. As a result, there arises a problem in which the decorative layer is warped into a concave shape under the influence of temperature and humidity.
  • a main constituent of the present invention is a melamine decorative board produced by stacking a decorative layer, a core layer, and a backside layer, and then forming the layers under heat and pressure.
  • the decorative layer is a resin-impregnated patterned paper.
  • the core layer is a plurality of sheets of a resin-impregnated core paper produced by impregnating a whitish fibrous base material with a resin liquid including: a condensate of melamine and formaldehyde; and a divalent polyalkylene glycol or a derivative thereof, or a tri- or more valent polyalkylene glycol polyvalent ether, and then drying the whitish fibrous base material.
  • a resin liquid including: a condensate of melamine and formaldehyde
  • the backside layer is a resin-impregnated backside paper produced by impregnating a fibrous base material with a condensate of melamine and formaldehyde, and then drying the fibrous base material.
  • the core layer is milky-white. Therefore, it never happens that dark brown color specific to phenol resin appears at the cut end surface to cause a sense of incongruity.
  • the resin-impregnated backside paper with a high concealing property is used as a backside layer, a concealing property is improved to avoid appearance of a ground color of a core member such as a plywood and a particle board. As a result, the melamine decorative board looks attractive in terms of design.
  • a warpage can be suppressed by setting a dimensional stability, which is measured in accordance with JIS K 6902, of the decorative layer after formed under heat and pressure to be greater than or equivalent to a dimensional stability of the backside layer.
  • FIG. 1 is a structural sectional view of a melamine decorative board of the present invention.
  • FIG. 2 is a perspective view showing a crack resistance test.
  • a condensate of melamine and formaldehyde i.e., a reactive resin
  • a condensate of melamine and formaldehyde can be obtained by: heating a mixture having a molar ratio of formaldehyde to melamine of 1.0 or more to a temperature of 80-100° C. under weak alkaline conditions to allow a methylolation reaction to proceed; condensing the mixture to reach a predetermined reaction level; and then neutralizing and cooling the mixture.
  • melamine can be used independently, co-condensation with acetoguanamine, benzoguanamine, cyclohexaneguanamine, ureas or the like is possible.
  • a modified resin using p-toluene sulfonamide, caprolactam and the like can be also utilized.
  • a denaturant 9-20 parts by weight of divalent polyalkylene glycol having a molecular weight of 2000 or less or a derivative thereof per 100 parts by weight of a solid content of the condensate is blended to the condensate to provide a resin liquid for impregnation.
  • divalent polyalkylene glycol polyvalent ether having a molecular weight of 2000 or less
  • 13-30 parts by weight thereof per 100 parts by weight of a solid content of the condensate is blended to the condensate as a denaturant to provide a resin liquid for impregnation.
  • the denaturant is dissolved into methyl alcohol; phase-separated from the melamine-formaldehyde condensate, which becomes matrix by drying after impregnation and heating during forming; and micro-dispersed uniformly. This contributes to translucency of the core layer of the obtained melamine resin decorative board, and improvement in dimensional stability, crack resistance, flexibility, and the like of the melamine resin decorative board.
  • the denaturant As for a state of the resin liquid provided for impregnation, it is necessary that while the condensate of melamine and formaldehyde, and the denaturant are dissolved into the resin liquid, the denaturant is separated and dispersed when the resin liquid is thermally cured. If the denaturant is in a uniformly dissolved state when the resin liquid is thermally cured, a melamine decorative board excellent in dimensional stability and crack resistance cannot be obtained.
  • the resin is in a uniformly transparent state, it is determined that the denaturant is neither separated from nor dispersed in the resin but the resin and the denaturant are dissolved in each other. If the resin is in a turbid milky-white state, it is determined that the denaturant is separated and dispersed, and a melamine decorative board excellent in dimensional stability and crack resistance can be obtained. If the denaturant exudes from the cured matter, it is determined that the denaturant is not dispersed but separated, and the above effects cannot be expected.
  • a blending ratio of the denaturant is less than a lower limit (by parts by weight)
  • a state in which the denaturant is sufficiently separated and dispersed in the resin cannot be obtained.
  • dimensional stability and crack resistance are not improved as intended, and spotty unevenness appears when only a core layer is formed, thereby to affect a color tone of a decorative layer.
  • a blending ratio of the denaturant exceeds an upper limit (by parts by weight)
  • properties such as heat resistance are deteriorated.
  • a melamine decorative board is obtained, exudation of the denaturant is induced during forming under heat and pressure and problems arise, for example, that a pressing board (forming plate) is stained, which is not preferable.
  • a divalent polyalkylene glycol or a derivative thereof are polyethylene glycol, polypropylene glycol, polybutylene glycol, poly(oxyethylene-oxypropylene)glycol, poly(oxyethylene-oxytetramethylene)glycol, poly(oxypropylene-oxytetramethylene)glycol.
  • a tri- or more valent polyalkylene glycol polyvalent ether are polyethylene glycol glyceryl ether, polypropylene glycol glyceryl ether, polybutylene glycol glceryl ether, poly(ethylene glycol-propylene glycol)glyceryl ether, poly(propylene glycol-tetramethylene glycol)glyceryl ether as a triad; and polyethylene glycol pentaerythritol ether, polypropylene glycol pentaerythritol ether, polybutylene glycol pentaerythritol ether, poly(ethylene glycol-propylene glycol)pentaerythritol ether as a tetrad.
  • a resin-impregnated core paper as a core layer is obtained by impregnating a whitish fibrous base material with a varnish prepared by adding a divalent polyalkylene glycol or a derivative thereof, or a tri- or more valent polyalkylene glycol polyvalent ether to the condensate; and then drying the whitish fibrous base material.
  • a whitish fibrous base material used various base materials can be applied, such as bleached kraft pulp paper, as well as paper including white fibers such as glass fibers, vinylon fibers, and the like, which become transparent or translucent when showing a wet color, blended paper, non-woven fabric, woven fabric, and the like.
  • a basis weight may be around 100-200 g/m 2 .
  • the whitish fibrous base material has 10% by weight or less of ash content in order to ensure a milky-white core layer and to obtain crack resistance and flexibility. If the ash content exceeds an upper limit, the core layer does not become in and the intended improvement in dimensional stability, crack resistance, flexibility, and the like in the decorative board cannot be obtained, which is not preferable. Moreover, it is preferable to adjust a total light transmittance in accordance with JIS K 7136 of an article formed only of resin-impregnated core paper to 30% or less. If the total light transmittance exceeds an upper limit, the color tone of the core layer when bonded cannot be obtained, which is not preferable.
  • base paper for a decorative board having a concealing property which is prepared by impregnating bleached kraft paper with a varnish and then drying the bleached kraft paper, for example, can be applied.
  • the varnish does not include the above-described divalent polyalkylene glycol or the derivative thereof, or the tri- or more valent polyalkylene glycol polyvalent ether so as to suppress a warpage of the melamine decorative board.
  • the resin is slow in curing speed and low in curing density; and in contrast, in a backside layer not including a divalent polyalkylene glycol or a derivative thereof, or a tri- or more valent polyalkylene glycol polyvalent ether, the resin is fast in curing speed and high in curing density.
  • the bleached kraft paper is produced from raw material for pulp by a Fourdrinier multi-cylinder paper machine, a Fourdrinier Yankee paper machine, or a cylinder paper machine. It is preferable that the bleached kraft paper is adjusted with titanium oxide or the like to have 3-10% by weight of ash content so that a color tone of a base plate, such as a plywood, a particle board, and a steel board, is not seen through. If the ash content is less than a lower limit, concealing property is lowered to allow the color tone of the base plate to easily appear, and if the ash content exceeds an upper limit, crack resistance of the melamine decorative board is made more likely to be deteriorated.
  • a base plate such as a plywood, a particle board, and a steel board
  • a basis weight may be 120-200 g/m 2 .
  • a further object of the present invention is to provide a melamine decorative board with less warpage.
  • a dimensional stability in accordance with JIS K 6902 of the decorative layer after formed under heat and pressure is greater than or equivalent to a dimensional stability of the backside layer.
  • a ratio of the dimensional stability of the decorative layer to that of the backside layer is adjusted to 1:0.3 or more to 1.0 or less, more preferably 0.4 or more to 0.7 or less, to keep a balance. Furthermore, it is preferable that a dimensional stability in accordance with JIS K 6902 of only a core layer after formed under heat and pressure is 0.5% or less because this provides the melamine decorative board with excellent crack resistance.
  • the melamine decorative board becomes easy to handle during processing and free from a breakage, a crack, and the like. If the backside layer is not used, the core layer with low curing density cannot bear shrinkage of the decorative layer, and becomes easily warped, making a decorative surface concave.
  • the melamine resin decorative board of the present invention is obtained by stacking the resin-impregnated backside paper, the plurality of sheets of resin-impregnated core paper, the resin-impregnated patterned paper, and, as appropriate, the resin-impregnated surface paper on the surface in this order, and pressing the stacked sheets of paper under thermal pressure condition of a temperature of 120-160° C., a pressure of 40-70 kg/cm 2 , and a time period of 30-70 minutes.
  • p-toluenesulfonic acid amide is added to the reaction solution and, after the reaction solution was adjusted to pH 7.2 and aged, the reaction solution was adjusted to pH 9.2 with caustic soda, to obtain a modified melamine-acetoguanamine co-condensate resin.
  • a solid content of the modified melamine-acetoguanamine co-condensate resin 20 parts by weight of a solid content of polypropylene glycol glyceryl ether having an average molecular weight of 850 and a hydroxyl value of 440-480 as a tri- or more valent polyalkylene glycol polyvalent ether; 7.5 parts by weight of urea; 100 parts by weight of methanol; 2 parts by weight of p-toluenesulfonic acid as a curing agent.
  • a colorless and transparent varnish was obtained.
  • the varnish was impregnated into a bleached kraft paper having an ash content of 0% by weight and a basis weight of 180 g/m 2 so that a degree of impregnation of resin as indicated by Formula 1 becomes 57% and a volatile matter content becomes 7%. Then, the bleached kraft paper was dried to obtain, a resin-impregnated core paper.
  • a patterned paper for a decorative board having a basis weight of 140 g/m 2 was impregnated with a varnish mainly composed of melamine resin so that a degree of impregnation of resin as indicated by Formula 1 becomes 80%. Then, the patterned paper was dried to obtain a resin-impregnated patterned paper as a decorative layer.
  • a kraft paper which had been produced from a pulp slurry obtained by beating hardwood bleached kraft pulp and a softwood bleached kraft pulp, having an ash content of 8% by weight and a basis weight of 185 g/m 2 was impregnated with a varnish mainly composed of the modified melamine-acetoguanamine co-condensate resin so that a degree of impregnation of resin as indicated by Formula 1 becomes 57%. Then, the kraft paper was dried to obtain a resin-impregnated backside paper.
  • One sheet of the resin-impregnated backside paper, three sheets of the resin-impregnated core paper, and one sheet of the resin-impregnated patterned paper are stacked in this order from bottom, and the stacked sheets were formed under thermal pressure condition of a temperature of 128° C., a pressure of 70 kg/cm 2 , and a time period of 120 minutes, to obtain a melamine decorative board having a thickness of 1.0 mm.
  • Embodiment 2 was implemented in a manner similar to that described in Embodiment 1, except that a kraft paper having an ash content of 2% by weight and a basis weight of 160 g/m 2 was used instead of the kraft paper having an ash content of 8% by weight and a basis weight of 185 g/m 2 .
  • Embodiment 3 was implemented in a manner similar to that described in Embodiment 1, except that a kraft paper having an ash content of 10% by weight and a basis weight of 190 g/m 2 was used instead of the kraft paper having an ash content of 8% by weight and a basis weight of 185 g/m 2 .
  • Embodiment 4 was implemented in a manner similar to that described in Embodiment 1, except that an amount of polypropylene glycol glyceryl ether blended was 13 parts by weight in terms of solid content.
  • Embodiment 5 was implemented in a manner similar to that described in Embodiment 1, except that an amount of polypropylene glycol glyceryl ether blended was 30 parts by weight in terms of solid content.
  • Embodiment 6 was implemented in a manner similar to that described in Embodiment 1, except that poly(ethylene glycol-propylene glycol)glyceryl ether was blended instead of polypropylene glycol glyceryl ether.
  • Embodiment 7 was implemented in a manner similar to that described in Embodiment 1, except that 15 parts by weight of a solid content of poly(oxyethylene-oxypropylene)glycol having an average molecular weight of 1400 and a hydroxyl value of 70-86 was blended as a divalent polyalkylene glycol or a derivative thereof instead of polypropylene glycol glyceryl ether.
  • Embodiment 8 was implemented in a manner similar to that described in Embodiment 7, except that an amount of poly(oxyethylene-oxypropylene)glycol blended was 9 parts by weight in terms of solid content.
  • Embodiment 9 was implemented in a mariner similar to that described in Embodiment 7, except that an amount of poly(oxyethylene-oxypropylene)glycol blended was 20 parts by weight in terms of solid content.
  • Comparative Example 1 was implemented in a manner similar to that described in Embodiment 1, except that four sheets of the resin-impregnated core paper and one sheet of the resin-impregnated patterned paper were used instead of using the resin-impregnated backside paper.
  • the dimensional stability of the backside layer shown in Table 1 is represented by a value measured in a test carried out for one sheet of the resin-impregnated core paper arranged undermost after formed under heat and pressure.
  • Comparative Example 2 was implemented in a manner similar to that described in Comparative Example 1, except that a resin-impregnated paper impregnated with a resin liquid (for resin-impregnated core paper) having no polypropylene glycol glyceryl ether blended therein was used.
  • the dimensional stability of the backside layer shown in Table 1 is represented by a value measured in a test carried out for one sheet of resin-impregnated paper arranged undermost after formed under heat and pressure.
  • Reference Example 1 was implemented in a manner similar to that described in Embodiment 1, except that a bleached kraft paper having an ash content of 0% by weight and a basis weight of 180 g/m 2 was used instead of the kraft paper having an ash content of 8% by weight and a basis weight of 185 g/m 2 .
  • Reference Example 2 was implemented in a manner similar to that described in Embodiment 1, except that a kraft paper having an ash content of 50% by weight and a basis weight of 140 g/m 2 was used instead of the kraft paper having an ash content of 8% by weight and a basis weight of 185 g/m 2 .
  • Reference Example 3 was implemented in a manner similar to that described in Embodiment 1, except that an amount of polypropylene glycol glyceryl ether blended was 5 parts by weight.
  • Reference Example 4 was implemented in a manner similar to that described in Embodiment 1, except that an amount of polypropylene glycol glyceryl ether blended was 40 parts by weight.
  • a melamine decorative board was obtained by forming under thermal pressure condition of a temperature of 132° C., a pressure of 70 kg/cm 2 , and a time period of 64 minutes.
  • a melamine decorative board obtained in a good condition was evaluated as ⁇ (good), and a melamine decorative board in which a bleedout (exudation) of the denaturant from a back face or a side face was observed was evaluated as X (poor).
  • External appearance of the core layer and the backside layer Three stacked sheets of the resin-impregnated core paper or just one sheet of the backside layer were formed under heat and pressure in a manner similar to that for obtaining a melamine decorative hoard, and then each external appearance was observed.
  • Total light transmittance Total light transmittance was measured based on the specification of JIS K 7361-1 (2000) 3.2, As a measuring device, Haze-Gard II manufactured by Toyo Seiki Seisaku-Sho, Ltd. was used.
  • the crack resistance was evaluated as ⁇ (very good), 10-20 mm as ⁇ (good), 20-30 mm as ⁇ (average), and 30 mm or longer as X (poor).
  • the crack resistance was also evaluated as X (poor).
  • Warpage A piece was cut out of the decorative board with a dimension of 280 mm by 50 mm (width direction ⁇ fiber direction), and an amount of warpage was measured at each of four edge points.
  • warpage resistance was evaluated as ⁇ (good), 5-10 mm as ⁇ (average), and 10 mm or more as X (poor).
  • Dimensional stability was measured based on the dimensional stability test in accordance with. “Testing method for laminated thermosetting high-pressure decorative sheets” as set forth in JIS K 6902.
  • the core layer was formed of three stacked sheets of the resin-impregnated core paper under a condition same as that of Embodiment 1, and the backing layer was formed of just one sheet of the backside layer under a condition. same as that of Embodiment 1.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
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CN109551580A (zh) * 2018-10-04 2019-04-02 南京航空航天大学溧水仿生产业研究院有限公司 超疏水阻燃三聚氰胺板的制备方法

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US20150101749A1 (en) 2015-04-16
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KR101747851B1 (ko) 2017-06-15
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CN102821957B (zh) 2016-03-02
AU2011230894A1 (en) 2012-10-04
JP2011218792A (ja) 2011-11-04
TWI562888B (ja) 2016-12-21
EP2551111A1 (en) 2013-01-30
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MY160317A (en) 2017-02-28
JP4979038B2 (ja) 2012-07-18

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