WO2024089640A1 - Composition de revêtement polymère pour meuble - Google Patents

Composition de revêtement polymère pour meuble Download PDF

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Publication number
WO2024089640A1
WO2024089640A1 PCT/IB2023/060810 IB2023060810W WO2024089640A1 WO 2024089640 A1 WO2024089640 A1 WO 2024089640A1 IB 2023060810 W IB2023060810 W IB 2023060810W WO 2024089640 A1 WO2024089640 A1 WO 2024089640A1
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Prior art keywords
coating composition
tai
previous
agent
composition according
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PCT/IB2023/060810
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English (en)
Inventor
Regina Andreia TORRES MALGUEIRO
Sérgio Filipe SANTOS MOREIRA
Mariana OSÓRIO PEREIRA
Fábio Gabriel FARIA LOUREIRO
Adriana Dinora DA SILVA DUARTE
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Centitvc - Centro De Nanotecnologia E Materiais Tecnicos Funcionais E Inteligentes
Ikea Industry Portugal, Sa
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Publication of WO2024089640A1 publication Critical patent/WO2024089640A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/703—Isocyanates or isothiocyanates transformed in a latent form by physical means
    • C08G18/705—Dispersions of isocyanates or isothiocyanates in a liquid medium
    • C08G18/706—Dispersions of isocyanates or isothiocyanates in a liquid medium the liquid medium being water
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/22—Catalysts containing metal compounds
    • C08G18/222—Catalysts containing metal compounds metal compounds not provided for in groups C08G18/225 - C08G18/26
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4288—Polycondensates having carboxylic or carbonic ester groups in the main chain modified by higher fatty oils or their acids or by resin acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/44—Polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • 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
    • C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides

Definitions

  • the present disclosure relates to a polymeric coating composition for wooden based furniture with improved adhesion, and also presents improved resistance to staining, namely by water, mineral oil, coffee and ethanolic solutions. Additionally, the polymeric coating of the present composition allows the easy cleaning of the furniture, due to their specific properties of sliding for hydrophilic liquids as well as for lipophilic liquids. The polymeric coating composition showed to be clean resistant and able to maintain its performance after several cleaning cycles. Furthermore, the present disclosure relates to a method to obtain said coating composition, and also to furniture comprising said coating composition.
  • hydrophobic coatings 4 are generally used along with Si, ZnO or TiO2 nanoparticles (NPs), being this type of materials available commercially 5 - 6 .
  • NPs nanoparticles
  • the application of coatings that provide micro-texture/roughness to the surface can induce antiadhesive and anti-static properties 7
  • active antimicrobial properties 8 through the addition of growth-retarding agents or biocides to coatings, which promotes microorganism cell lysis, such as ZnO 9 and Ag 10 NPs and photocatalytic additives (eg TiOZ) 11 .
  • the commercial availability of functional furniture is limited, and, in this context, it is intended for hospital use or is not easily accessible to the common consumer.
  • the present disclosure relates to the development of multidisciplinary solutions for an Active, Safe and Healthy Life, focusing on defining and optimizing a new concept of senior-friendly habitat. Included in which is the objective of developing the architectural "home space" design focused on the accommodation of users, and the development of functional furniture. To reduce time and efforts associated with cleaning, the present disclosure describes a coating composition to provide furniture surfaces with easy-cleaning and antimicrobial intrinsic properties to be applied during the production process.
  • the present disclosure relates to the development of innovative and multifunctional modular furniture, with better cleaning and sanitizing properties through the application of a functional finish, with an emphasis on the exploration of eco-sustainable processes and materials and easy industrial implementation. This solution is also committed to increase the durability and long-term protection of the innovative product, without modifying other aesthetic parameters that are equally important for the consumer.
  • the present disclosure is focused on liquid dirt, once it is one of the major concerns on kitchen furniture due to spills of grease and liquids. Once the kitchen cabinets doors are at 90° angle, it is important to assess the water and oil sliding angle and angular hysteresis.
  • a droplet On a tilted surface, a droplet possesses a maximum contact angle before the droplet advances (advancing contact angle - 0 adv) and a minimum contact angle before the droplet recedes (receding contact angle 0 rec).
  • the sliding angle is the tilting angle at which the gravitational force overcomes the lateral adhesion forces and causes the droplet to slide.
  • Different water-based polyurethane (PU) dispersion can be used in the polymeric coating composition of the present disclosure, for instance, lk polyurethane dispersion, 2k polyurethane dispersion, anionic polyurethane dispersions, cationic polyurethane dispersions, non-ionic polyurethane dispersions, aromatic polyurethane dispersions and aliphatic polyurethane dispersions.
  • PU polyurethane
  • PU coatings can be divided into two main groups, namely into 1 and 2 pack systems (lk and 2k).
  • the lk system basically contains a dispersed, fully reacted PU whilst a 2k system can contain partially reacted PU and unreacted monomers. Both systems can be solvent-based or waterborne.
  • the viscosity may be measured by different methods known in the art. In the present disclosure, the viscosity was measured through a Fungilab viscometer using L2 spindle and a velocity of 20 rpm at 23 °C.
  • An aspect of the present disclosure relates to a polymeric coating composition for wooden based furniture easy cleaning comprising:
  • At least one antimicrobial agent 0.01 - 5 % (w/wtotal) of at least one antimicrobial agent.
  • the polymeric coating composition of the present disclosure showed to be clean resistant, and it is able to maintain its performance after several cleaning cycles. Additionally, it showed improved results in terms of adhesion, uniformity of the coating, and final coating color coordinates in different substrates tested. It also showed to be resistance to damage by external forces.
  • the coating composition comprises 1-4% (w/w to tai) of at least one matting agent.
  • the matting agent is elastomeric silicone suspension; preferably an aqueous suspension of elastomeric silicone beads comprising epoxy functionality.
  • the coating composition comprises
  • the coating composition further comprises at least one of the following components, preferably all,
  • the coating composition comprises: at least one of the following components, preferably all,
  • drier catalyst agent preferably 0.1 - 0.5 % (w/w to tai);
  • the level of adhesion of the coating composition is equal to zero, measured using the procedure ISO 2409:2020 (Fifth edition, 2020-08) - Paints and varnishes — Cross-cut test.
  • the viscosity of the coating composition ranges from 600-1500 mPa.s; preferably 900 - 1100 mPa.s measured on a Fungilab viscometer using a 500 mL glass beaker containing the coating composition up to its maximum capacity, with spindles L2, a rotation of 20 rpm, and a torque between 50 and 95%, at 23 °C
  • the water based polyurethane dispersion is a lk aliphatic, fatty acid- modified and anionic polyurethane dispersion (e.g. Bayhydrol® UH 2874), preferably comprising a viscosity equal or below 1000 mPa.s at 23°C.
  • the water based polyurethane dispersion is a lk aliphatic, anionic polyurethane dispersion containing polycarbonate (e.g., Bayhydrol UH 2606).
  • the coating composition is absent of titanium dioxide.
  • the matting agent is selected from a list consisting of: elastomeric silicone suspension (e.g. Dowsil IE-3301), olive pit powder, naturally based wax dispersion (e.g. Ceridust 8091 VITA), beeswax, optical brighteners, silica nanoparticles, polymethylsilsesquioxane microbeads (e.g. E+540), aliphatic polyurethane matting agent (e.g. Decosphaera BIO 8 TR) or mixtures thereof.
  • the matting agent is elastomeric silicone suspension (e.g. Dowsil IE-3301).
  • the antimicrobial agent is selected from consisting of: a mixture of 1,2-Benzisothiazol-3(2H)-One (BIT) and 2-Methyl-2H-lsothiazol-3-One (MIT) (e.g. Nuosept BM 11), vanillin, chitosan, titanium dioxide, quaternary ammonium compound, a mixture of 5 Chloro-2-Methyl-4-isothiazolin-3-one and 2-Methyl-4-isothiazolin-3-one (e.g. MERGAL® CM 1.5), or mixtures thereof.
  • BIT 1,2-Benzisothiazol-3(2H)-One
  • MIT 2-Methyl-2H-lsothiazol-3-One
  • vanillin e.g. Nuosept BM 11
  • vanillin e.g. Nuosept BM 11
  • vanillin e.g. Nuosept BM 11
  • vanillin e.g. Nuo
  • the antimicrobial agent is a mixture of 1,2-Benzisothiazol- 3(2H)-One (BIT) and 2-Methyl-2H-lsothiazol-3-One (e.g. Nuosept BM 11).
  • BIT 1,2-Benzisothiazol- 3(2H)-One
  • 2-Methyl-2H-lsothiazol-3-One e.g. Nuosept BM 11
  • the defoamer agent is a VOC-free defoamer agent selected from a list consisting of: composition of polysiloxanes and hydrophobic solids in polyglycol (e.g. Byk 28), polypropylene glycol, mineral oils, vegetable oils, natural and synthetic waxes, or mixtures thereof.
  • the defoamer agent is a composition of polysiloxanes and hydrophobic solids in polyglycol (e.g. Byk 28).
  • the hydrophobic agent is selected from a list consisting of: polyether modified hydroxy functional polydimethylsiloxane (e.g. Silclean 3720); organosilanes, preferably hexadecyltrimethoxysilane or trimethoxymethylsilan; fluorinated C6 hydrocarbons (e.g. Phobol CP-100; Addiguard C6/6003; Hexafor 6284); micronized PTFE-modified polyethylene wax (e.g. Ceraflour® 999); Capstone® (e.g. Capstone® ST200); beeswax; or mixtures thereof.
  • the hydrophobic agent is polyether modified hydroxy functional polydimethylsiloxane (e.g. Silclean 3720).
  • the first glycol ether-based solvent is selected from a list consisting of: dipropylene glycol methyl ether (e.g. DowanolTM DPM), dipropylene glycol, 1,3-butylene glycol, 2-methylpentane-2,4-diol, or mixtures thereof.
  • the first glycol ether-based solvent is dipropylene glycol methyl ether (e.g. DowanolTM DPM).
  • the second glycol ether-based solvent is selected from a list consisting of: propylene glycol diacetate (e.g. DowanolTM PGDA), dipropylene glycol methyl ether acetate, Dipropylene glycol methyl ether, or mixtures thereof.
  • the second glycol ether-based solvent is propylene glycol diacetate (e.g. DowanolTM PGDA).
  • the drier catalyst agent is selected from a list consisting of: cobalt- free iron complex-based catalyst (e.g. Borchi OXY - Coat 1101), zirconium diketonate, dibutyltin dilaurate, or mixtures thereof.
  • the drier catalyst agent is cobalt-free iron complexbased catalyst (e.g. Borchi OXY - Coat 1101).
  • the isocyanate-based component is selected from a list consisting of: hydrophilic aliphatic polyisocyanate based on pentamethylene diisocyanate (e.g. Bayhydur® eco 701-90), Aromatic blocked isocyanate (e.g. Meikanate TP-10), aliphatic blocked polyisocyanate (e.g. Imprafix® 2794), branched polymer with ether and urethane groups comprising crosslinking, blocked isocyanate groups (e.g. Desmocap® 11), ketone-aldehyde condensation resin (e.g. Tego® Variplus CA) or mixtures thereof.
  • the isocyanatebased component is hydrophilic aliphatic polyisocyanate based on pentamethylene diisocyanate (e.g. Bayhydur® eco 701-90).
  • Another aspect of the present disclosure relates to furniture comprising the coating composition herein described, preferably the furniture is kitchen furniture.
  • the wet grammage of the coating composition in the furniture ranges from 70 g/m2 to 240 g/m2; preferably ranges from 100 g/m2 to 140 g/m2.
  • the furniture material is a wood-based material, preferably with a curing basecoat selected from a list consisting of: polyurethane, UV (ultraviolet radiation coating), waterborne or polyester; more preferably polyurethane.
  • the wood-based material is selected from a list consisting of: high density fiberboard (HDF), medium-density fibreboard (MDF) and three-dimensional fiberboard (3DF), or mixtures thereof.
  • HDF high density fiberboard
  • MDF medium-density fibreboard
  • 3DF three-dimensional fiberboard
  • Another aspect of the present disclosure relates to a method for obtaining the coating composition
  • a method for obtaining the coating composition comprising the following steps: adding to the water based polyurethane dispersion, a defoamer agent, a hydrophobic additive, a first glycol ether-based solvent, a second glycol ether-based solvent, a drier catalyst agent, a isocyanate-based component, a matting agent and an antimicrobial agent; wherein each component is adding separately and sequentially, with a period of stirring of at least 5 minutes between each component addition and with a final period of stirring of at least 20 minutes after the last addition; preferably the stirring is performed at 700 rpm at 25 °C.
  • the composition of the present disclosure provides improved adhesion to wood-based subtracts with a polyurethane basecoat, and at the same time improved resistance to staining, namely by water, mineral oil, coffee and ethanolic solutions. Additionally, and of utmost importance, the polymeric coating of the present composition allows the easy cleaning of the furniture, due to their specific properties of sliding for hydrophilic liquids and also for lipophilic liquids. The composition herein described also showed to be resistant and able to maintain its performance after several cleaning cycles.
  • Figure 1 Images of the uncoated substrate (left) and of the substrate coated with Fl (right).
  • Figure 2 Optical microscopy images of the uncoated substrate, Fl, F2 and F3 coated samples' surfaces.
  • Figure 3 a) 2D representation of the difference between chromatic and non-chromatic colours and the different parameters used; b) 3D representation of the 3 parameters used to classify non-chromatic colours: .AL*, a*, and b*.
  • Figure 4 FTIR spectra of the uncoated substrate and of the samples coated with the Fl, F2 and F3 compositions.
  • Figure 5 Images of the mineral oil dragging marks on the surfaces of the nonfunctionalized substrate (left) and of the coated substrate (right).
  • Figure 6 Graphic representation of the culture growth (above) and of cell density and viability (bellow) of E. coli on the surface of the uncoated substrate (A), of the substrate coated with Fl (B) and of the substrate coated with F3 (C).
  • the present disclosure relates to a polymeric coating composition for wooden based furniture easy cleaning comprising a water based polyurethane dispersion, at least one matting agent and at least one antimicrobial agent. Furthermore, the present disclosure relates to a method to obtain said coating composition, and furniture comprising said coating composition.
  • the selected substrate for the development of multifunctional furniture was a woodbased substrate with a polyurethane basecoat.
  • the coating composition comprises polyurethane-based formulations with 50% recycled content, functionalized with an eco-friendly matting agent and with a FDA approved antimicrobial additive.
  • the water based polyurethane coating (Fl) was mixed using continuous mechanical agitation for 40 min at 700 rpm at room temperature, where the different components of Fl (VOC (volatile organic compound) -free defoamer, hydrophobic additive and cobalt-free drier) were added to the composition in four different steps, with a 5 min stirring in between and a final 20 min stirring before application.
  • Fl volatile organic compound
  • F2 and F3 were prepared in the same way as Fl, but before the final step of stirring, the matting agent (F2 and F3) and the antimicrobial agent (F3) were added.
  • the preparation is divided in a first part (Part A) and in a second part (Part B).
  • Part A comprises the water-based polyurethane dispersion, the VOC-free defoamer agent, the hydrophobic agent, the first glycol ether-based solvent, the drier catalyst and the water (Each component is adding separately and sequentially, with a period of stirring of at least 5 minutes).
  • Part B comprises the mixture of the isocyanate-based component and the second glycol ether-based solvent.
  • the coating composition is then finalized by adding the second part (Part B) to the first part (Part A).
  • the coating composition was applied by spray.
  • the spray coating application was performed on the polyurethane painted wood-based selected substrate (HDF, MDF, 3DF). Prior to spraying, all the samples were cleaned in a twostep process: a passage of compressed air to blow and passage of ethanol wet paper towel. The samples were placed between 10 cm and 15 cm distance from the spray gun, and the coating compositions Fl, F2 and F3 were applied until a thin and uniform layer with similar wet grammages (between 70 g/m 2 and 240 g/m 2 ) was achieved. All samples were dried using an IR tunnel oven set to 50 °C for 30 min. The samples were then left to rest for 8h.
  • the final formulation is filtered, preferably with a 125 pm mesh filter, to avoid the transference of aggregates or undispersed particles.
  • a spray coating application gun was used, with the filter incorporated, with a diameterer between 1.2 to 1.5 mm, preferably 1.2 mm and a pressure between 2 and 4 bar, preferably 2 bar.
  • FTIR-ATR attenuated total reflectance (ATR) Fourrier transform infrared (FTIR) spectroscopy (FTIR- 223 ATR) was performed to evaluate the chemical groups present at the surface of the coated substrates, in comparison to the uncoated substrate, using a Perkin Elmer Spectrum 100 Series spectrophotometer with a spectral range of 4000 cm' 1 to 650 cm' 1 and a resolution factor of 8 cm 1 .
  • Adhesion Test the adhesion of the functional finishing coating to the substrates in study was performed according to the normative procedure described in ISO 2409:2020 - Paints and varnishes — Cross-cut test. The level of adhesion of the coatings to the substrates was attributed according to the classification scale ranging from 0 to 5 (being 0 the maximum level of adhesion and 5 a coating with no adhesion). The level for approval in quality tests in Adhesion Test is a result of 0.
  • Stain Resistance Test the resistance of the coated substrates to staining by water, mineral oil, coffee and 48% ethanolic solution, compared to the performance of the uncoated substrates, was evaluated according to the procedure described in normative EN 12720-2009 - Furniture - Assessment of surface resistance to cold liquids. The level of stain resistance of the tested surfaces was attributed according to the classification scale ranging from 1 to 5 (being 5 the absence of stain and 1 a strong stain). The minimum level for approval in quality tests is stain resistance equal or superior to 4.
  • This procedure is performed on the samples with 0 cycles of cleaning 2.5 mL of water and 2.5 mL of mineral oil spilled on the surface, as well as on samples with at least 10 cycles of spillage and cleaning.
  • the surface cleaning process was done by first passing a dry paper towel, followed by passing a water wet paper towel, and finalizing by passing a dry paper towel.
  • Antimicrobial Activity for the evaluation of the antimicrobial activity of the developed coated materials, the samples were previously cut into 1.5 cm x 1.5 cm x 1 cm cubes, washed with water and cotton for the removal of surface contaminations, and disinfected under UV light. Upon this procedure, dry films of E. coli were put in contact with the coated and uncoated surfaces for 24 h. Upon this, the dry film was removed, and the number of cells adhered to the surface, as well as the cell viability and density where determined.
  • Viscosity determination The viscosity of the Fl, F2 and F3 dispersions were determined at 23 °C on a Fungilab viscometer using L2 spindle and a velocity of 20 rpm.
  • the polyurethane-based compositions of the present disclosure (Fl, F2 and F3) comprises a viscosity between 600 mPa.s and 1500 mPa.s.
  • the polyurethane-based compositions were applied on wood-based substrate representative of furniture with a polyurethane-based basecoat, and resulted in visually uniform finishes (Figure 1).
  • Figure 1 For a more detailed analysis, the surface of the coated substrates and of the uncoated substrate were analysed by optical microscopy, having verified that the applied coatings appear to be uniformly distributed over their surface. Additionally, it is shown that the applied coatings also present some porosity in a similar way to the basecoat of the non-functionalized substrate, resulting from the arrangement of the polymer chains during the curing stage and even to the evaporation of the solvents ( Figure 2).
  • the AL* value have a variation between +0.10 and +0.82.
  • the higher Lightness value of the Substrate + Fl (+0.82) can be related with the absence of matting agent on the composition and the subsequent more brightness spotted simply, by observation.
  • F2 and F3 have a lower non-lightness variation when compared with uncoated substrate.
  • the Aa* value represents the greener/redder variations. All the results are similar to the uncoated substrate and inside the standard deviation range. This proves the green colour similarity between the uncoated substrate and the other samples, and the transparency of the functional coating.
  • the Ab* values are negative which indicates a slightly higher blue level when compared with the control.
  • One of the purposes of the present disclosure was to achieve a substrate with improved easy-cleaning properties through the ease of water and oil slippage and reduction of their trail, without the loss of stain resistance presented by the uncoated substrate (resistance values equal or higher than 4).
  • the surfaces of the substrates coated with Fl, F2 and F3 were evaluated in accordance with EN 12720-2009. According to the results presented in Table 3, the coated substrates present high levels of resistance to staining by water, mineral oil, 48% ethanol solution and coffee, passing the quality criteria defined.
  • Table 3 Values of the stain resistance level (EN 12720-2009), of the surfaces of the unfunctionalized substrate and of the substrates coated with Fl, F2 and F3.
  • compositions Fl, F2 and F3 were developed to reduce the adhesive forces between the basecoat of the non-functionalized substrate and the compositions. This leads to an easy mobility and dragging of all/almost all of its volume during movement. In this sense, the surfaces of the non-functionalized substrate and the substrates coated with Fl, F2 and F3 were analysed in a tensiometer to determine the angular hysteresis and tilt angle, and the results obtained are presented in the Table 4.
  • Table 5 Values of the time needed for the sliding of 20 pL droplets of water and mineral oil to slide over 9 cm of the surfaces of the unfunctionalized substrate and of the substrates coated with Fl, F2 and F3 after 0 and 10 cycles of cleaning spilled water and mineral oil.
  • the surfaces of the non-functionalized substrate and the F3 functionalized substrate do not show antimicrobial properties, since non-viable cells represent between 0.01% and 6% of the total number of adherent cells.
  • the F3 coated substrate has 0.55 log (69%) fewer total E. coli cells than the unfunctionalized substrate. Based on this and the fact that this sample hinders the adhesion and growth of cultures of the bacteria, it is possible to conclude that the substrate coated with F3 has antimicrobial activity.
  • Table 6 depicts examples F4-F6 of the composition of the present disclosure.
  • composition F5 of the present disclosure provides improved results.
  • the water-based polyurethane dispersion Bayhydrol UH 2874 (lk aliphatic, fatty acid-modified, anionic polyurethane dispersion) was substituted by Bayhydrol UH2606 ((lk aliphatic, anionic polyurethane dispersion containing polycarbonate). It was found that using a lk aliphatic, anionic polyurethane dispersion containing polycarbonate, it was obtained an improved performance in terms of coating yellowing. Additionaly, formulation F5 does not comprise TiCh, once it was verified that TiCh provides decreased performance in terms of stain resistance.
  • Examples F4 and F5 were tested regarding level of resistance to staining (EN 12720- 2009), the level of adhesion (ISO 2409), time for sliding of water and mineral oil drops and the antimicrobial activity. Tables 7-8 resumes the results obtained. Table 7. Results with example 4 and example F6.
  • Table 10 provides values of the surface resistance level (IOS-M AT-006 procedure, based on the EN 12720:2009 test method) and the force required in the Hamberger Hobel test (IOS- TM-0002 Test method for surface resistance) of samples coated with example F6.
  • the coating composition of the present disclosure provides improved results concerning surface resistance to staining by different liquids, in particular aqueous solutions (water and coffee) as well as mineral oil and ethanolic solutions, in different substrates (as depicted in Table 8). Additionally, it showed improved results in terms of adhesion, uniformity of the coating, and final coating colour coordinates in the four different substrates tested. It also showed to be resistance to damage by external forces.
  • the present disclosure shows that the developed coating compositions allowed to improve the surface properties of the wood-based substrate, doting them with easy-cleaning and antimicrobial properties, without prejudice of its already good stain resistance performance. These new coated substrates allow a faster sliding of water and mineral oil over the surfaces, with almost inexistent dragging marks, allowing to achieve a clean surface with no effort. Furthermore, the coating composition F3 presents an active antimicrobial activity which will decrease the growth of E. coli colonies, reducing the risk of related diseases.
  • ranges are included. Furthermore, it should be understood that unless otherwise indicated or otherwise evident from the context and/or understanding of a technical expert, the values which are expressed as ranges may assume any specific value within the ranges indicated in different achievements of the invention, at one tenth of the lower limit of the interval, unless the context clearly indicates the contrary. It should also be understood that, unless otherwise indicated or otherwise evident from the context and/or understanding of a technical expert, values expressed as range may assume any subrange within the given range, where the limits of the sub-range are expressed with the same degree of precision as the tenth of the unit of the lower limit of the range.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Plant Pathology (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne une composition de revêtement polymère pour un nettoyage facile de meuble à base de bois comprenant une dispersion de polyuréthane à base d'eau, au moins un agent de matité et au moins un agent antimicrobien. En outre, la présente invention concerne un procédé d'obtention de ladite composition de revêtement, et un meuble comprenant ladite composition de revêtement.
PCT/IB2023/060810 2022-10-26 2023-10-26 Composition de revêtement polymère pour meuble WO2024089640A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4413859A1 (fr) * 2023-02-13 2024-08-14 Livinguard Technologies AG Mélanges pour rendre des substrats cationiques pour des applications antimicrobiennes et autres, telles que la teinture durable, avec utilisation de teinture en sel ou en une étape de tissus mélangés

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