Classifications

• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/10—Coatings without pigments
  • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
  • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • 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
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
  • D21H27/18—Paper- or board-based structures for surface covering
  • D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
  • D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/47—Condensation polymers of aldehydes or ketones
  • D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/47—Condensation polymers of aldehydes or ketones
  • D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
  • D21H17/51—Triazines, e.g. melamine

Definitions

• the invention relates to an impregnate and a method for producing the impregnate and a use of the impregnate.
• Impregnates are an important primary product of the wood-based materials industry for the production of coatings and laminates. Impregnates are a base paper that consists either of cellulose paper, sodium kraft paper or other special papers that are also printed with a wide variety of motifs and that is soaked with mostly thermally curable resins and various additives and then dried.
• the finished impregnate is a preliminary product which, under the influence of pressure, for example between 10 and 70 kg / cm 2 , and heat, for example between 150 and 200 ° C, in one or more layers on the wood-based panels to be coated, such as one Chip or medium density fibreboard (MDF board) is pressed on directly. A chemically, thermally and mechanically highly resistant coating is obtained.
• the impregnate can be pressed with the wood-based material either in the short-cycle process or in the continuous process.
• the core layer with another impregnate, e.g. a decorative paper, and allow pressure and heat to act on it
• the laminate can be produced in a clock process (HPL - high pressure laminate) or in a continuous process (CPL - continuous pressure laminate).
• impregnation channels are used as industrial plants for the production of the impregnates, in which continuous production is possible.
• the base paper runs through one or more troughs filled with impregnating fluids or the liquid is applied in a controlled manner via rollers and doctor blades or also via nozzles.
• the base paper so impregnated. is dried immediately afterwards in order to evaporate the excess water or solvent and to obtain a dry, storage-stable and machine-processable preliminary product.
• the continuous impregnate is either cut into sheets (dimensions, for example, 2x5m 2 ) or wound on reels into rolls with several 100 linear meters.
• the fluid has, for example, aqueous condensation resins such as urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF) or phenol-formaldehyde resin (PF) and mixtures thereof, various additives such as wetting agents and release agents and a hardener, for example based on paratoluenesulfonic acid (PTSA).
• aqueous condensation resins such as urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF) or phenol-formaldehyde resin (PF) and mixtures thereof, various additives such as wetting agents and release agents and a hardener, for example based on paratoluenesulfonic acid (PTSA).
• aqueous condensation resins such as urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF) or phenol-formaldehyde resin (PF) and mixtures thereof
• Core papers for laminates consist, for example, of kraft paper> which are impregnated with PF resins.
• Decorative papers consist of cellulose paper filled with, for example, titanium oxides and printed with a wide variety of motifs, which are mostly produced with UF and MF resins in two impregnation steps.
• Overlay impregnates consist of pure cellulose paper, which are mostly impregnated with pure MF resin.
• cellulose papers filled with powders made from extremely hard compounds such as corundum (aluminum oxide) are also used, or it is state of the art to disperse the corundum in the fluid and to apply it together with the base paper.
• MF and UF resins or acrylates used become highly transparent in the course of pressing under the influence of pressure and temperature, so that the print motif becomes fully visible in the finished coating or laminate.
• Overlay papers become completely transparent when pressed and can therefore be applied as one or more layers over decorative papers with the aim of achieving increased resistance to chemical, thermal and mechanical stress.
• the basis weights of the base papers are adapted to the requirements, the same applies to the amount of resins applied.
• Usual basis weights are between 30 and 300 g / m 2 , usual levels of resination are in the range between 40 and 300 wt%, calculated as a solid resin based on the paper weight.
• Additives such as wetting agents and release agents are only added to the fluid in extremely small quantities - mostly well below 1% by weight based on solid resin. These are said to favor both the wettability and the penetration of the base paper during the impregnation process, and also to support the demolding of the finished coated plate from the press plate.
• the invention is therefore based on the technical problem of improving the impregnate known from the prior art and its production process in such a way that the disadvantageous surface properties are improved.
• inventions according to at least one curable resin is applied to a base paper.
• polytetrafluoroethylene (PTFE) is applied to the base paper, with PTFE being used in the form of Teflon.
• PTFE polytetrafluoroethylene
• the at least one resin and the PTFE can be applied in several successive work steps, between which the base paper is dried.
• PTFE polystyrene resin
• PTFE is cold-resistant up to -200 ° C and is permanently heat-resistant up to +260 ° C.
• the impregnate is more easily detached from the pressing surface during further processing and thus the surface of a coated wood-based panel or laminate that has just been produced is not damaged.
• PTFE in the impregnate ensures that its surface or the surface of the coated wood-based panel or laminate produced therewith is more dirt and water-repellent.
• the non-stick effect for dirt particles is increased and the wettability with water is reduced.
• This Surface properties play a major role in many areas of application of coated wood-based panels, e.g. surfaces of furniture and wall or floor coverings. Their properties are therefore improved by the method according to the invention.
• PTFE provides electrostatic insulation and thus prevents electrostatic charging of the wood-based panel or. - the laminate.
• At least one resin is a condensation resin such as urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), phenol-formaldehyde resin (PF) or a mixture thereof.
• UF urea-formaldehyde resin
• MF melamine-formaldehyde resin
• PF phenol-formaldehyde resin
• the PTFE can be added to this resin in various ways while the process is being carried out.
• At least one resin is applied in the form of at least one fluid and that the polytetrafluoroethylene is dissolved or dispersed in at least one of the fluids.
• the PTFE is applied to the base paper with the same fluid as the resin.
• the PTFE can be applied to the base paper with at least one of the application devices together with the resin and / or additive applied therewith. So can the position of the PTFE-containing impregnation layer within the layer structure of various impregnation layers can be set specifically.
• a second alternative consists in dissolving or dispersing the polytetrafluoroethylene in a separate fluid and applying it to the base paper with the fluid.
• At least one fluid containing polytetrafluoroethylene is applied to the base paper by dipping, brushing or spraying.
• the same application methods are used that are also used for the application of the at least one resin, so that they can be combined in the manner described above.
• the concentration of the polytetrafluoroethylene in the fluid contained therein is advantageously set in the range from 5 to 50% by weight, preferably 10 to 25% by weight. This ensures easy processing of the fluid.
• the weight ratio of polytetrafluoroethylene applied to the applied resin to a value in the range of 0.1 to 10%, preferably 0.5 to 5%, especially 1 to 3%uß- ⁇ provides. It should be taken into account here that too small a proportion by weight of PTFE greatly reduces its effect. Too high proportions by weight of PTFE on the other hand impair the hardening effect of the resin and lead to increased manufacturing costs. A lower limit of 0.1% and an upper limit of 10% were found. Good results are found at values between 0.5 and 5%, while the best results are achieved in the range of 1 to 3%.
• an impregnate with the features of claim 8. This consists at least of a base paper and a portion of at least one curable resin, a portion of polytetrafluoroethylene being provided. With this impregnate, the above-mentioned special properties of the impregnate are achieved.
• At least one resin is a condensation resin such as urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), phenol-formaldehyde resin (PF) or a mixture thereof.
• UF urea-formaldehyde resin
• MF melamine-formaldehyde resin
• PF phenol-formaldehyde resin
• the proportion of PTFE can be distributed to the impregnate in different ways.
• the weight ratio of the polytetrafluoroethylene to the resin is in the range from 0.1 to 10%, preferably 0.5 to 5%, in particular 1 to 3%.
• the properties of the impregnate to be achieved are described above.
• the technical problem outlined above is also solved by using an impregnate of the type described above for the production of a coated wood-based material.
• the impregnate according to the invention is processed according to one of the methods described at the beginning.
• the wood-based material produced in all the uses of the impregnate according to the invention described above, for example chipboard or MDF board, thus obtains surface properties as have been described in detail above and can be used particularly advantageously in the field of furniture production and the production of wall and floor surfaces.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

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Family Applications (1)

Country Status (6)

Families Citing this family (12)

Family Cites Families (9)

• 2000
  • 2000-07-21 DE DE10035924A patent/DE10035924B4/de not_active Expired - Fee Related
• 2001
  • 2001-07-19 EP EP01969435A patent/EP1301661A1/de not_active Ceased
  • 2001-07-19 WO PCT/EP2001/008348 patent/WO2002008518A1/de not_active Application Discontinuation
  • 2001-07-19 PL PL01366168A patent/PL366168A1/xx not_active Application Discontinuation
  • 2001-07-19 CZ CZ20030181A patent/CZ301136B6/cs not_active IP Right Cessation
  • 2001-07-19 AU AU2001289695A patent/AU2001289695A1/en not_active Abandoned

Non-Patent Citations (1)

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