WO2021214576A1 - Additifs à base de nanoparticules à surface modifiée dans des compositions imprimables contenant des particules - Google Patents

Additifs à base de nanoparticules à surface modifiée dans des compositions imprimables contenant des particules Download PDF

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Publication number
WO2021214576A1
WO2021214576A1 PCT/IB2021/052819 IB2021052819W WO2021214576A1 WO 2021214576 A1 WO2021214576 A1 WO 2021214576A1 IB 2021052819 W IB2021052819 W IB 2021052819W WO 2021214576 A1 WO2021214576 A1 WO 2021214576A1
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curable composition
curable
metal oxide
polymeric
oxide nanoparticles
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PCT/IB2021/052819
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English (en)
Inventor
Wimonwan KLINKAJON
Jr. Jimmie R. Baran
Craig R. Sykora
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3M Innovative Properties Company
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Publication of WO2021214576A1 publication Critical patent/WO2021214576A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
    • A47L13/16—Cloths; Pads; Sponges
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

Definitions

  • the current disclosure relates to printable compositions that contain particles and include surface-modified nanoparticle additives, to abrasive articles prepared from these printable compositions, and mehods of preparring abrasive articles.
  • Printing typically uses common printing equipment suitable for defining patterns on material, such as screen printing, flexography, gravure, offset lithography, and inkjet. These methods are relatively low-cost processes. The selection of the printing method used is determined by requirements concerning printed layers, by the properties of printed materials as well as economic and technical considerations of the final printed products.
  • Sheet-based inkjet and screen printing are best for low-volume, high- precision work.
  • Gravure, offset and flexographic printing are more common for high- volume production.
  • the current disclosure relates to printable compositions that contain particles and include surface-modified nanoparticle additives, to abrasive articles prepared from these printable compositions, and mehods of preparring abrasive articles.
  • the curable compositions comprise a curable latex, polymeric, precision shaped-grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles, where the curable composition is printable at room temperature.
  • the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition.
  • the abrasive articles comprise a non-woven substrate layer with a first major surface and a second major surface, and an array of a plurality of abrasive dots.
  • the abrasive dots comprise a dried and cured polymeric latex, polymeric precision shaped grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles.
  • the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition used to form the abrasive dots.
  • the method comprises providing a non-woven substrate layer with a first major surface and a second major surface, providing a curable and printable composition, printing the curable and printable composition onto the second major surface of the non-woven substrate layer in an array of dots, and drying and curing the curable and printable composition dots.
  • the curable and printable composition has been described.
  • Figure 1 show TEM images of NP-3 nanoparticles (NALCO 2329K) at 6300 magnification (left side) and 8900 magnification (right side).
  • Figure 2 is a cumulative histogram showing the ratio of maximum diameter to minimum diameter for the dots of Example 1 and Comparative Example CE1.
  • Figure 3 is a cumulative histogram of the circularity of the dots for Example 1 and Comparative Example CEE]
  • Figure 4 shows microscope pictures for Example 1.
  • Figure 5 shows microscope pictures for Comparative Example CE1.
  • FIG. 6 shows microscope pictures for the acrylic disc scratch test samples for Example 1 (left side picture) and Comparative Example CE1 (right side picture).
  • a printable material is applied to a surface and then cured to form a structure on the surface.
  • the structure can have a wide range of shapes such as being a dot, a pattern such as indicia, and the like.
  • Printing typically uses common printing equipment suitable for defining patterns on material, such as screen printing, flexography, gravure, offset lithography, and inkjet. These methods are relatively low-cost processes. The selection of the printing method used is determined by requirements concerning printed layers, by the properties of printed materials as well as economic and technical considerations of the final printed products.
  • inks whether curable or not curable, that have specific and often contradictory properties.
  • the ink in order to be readily printable, the ink needs to have a relatively low viscosity which is typically achieved in ink technology through the use of liquid media to dilute the solid components of the ink.
  • the use of dilute inks is unsuitable.
  • curable inks that have a curable liquid medium and solid particles have been developed for a wide range of applications such as electronic articles.
  • An issue with these inks is that the particle-containing inks can be difficult to deliver by printing techniques as the particles can clump and form agglomerates that can clog printing heads and form non-uniform printed patterns.
  • Disclosed herein are methods for preparing abrasive articles by the printing of inks containing abrasive particles onto a substrate surface.
  • the abrasive particles are polymeric precision shaped grain mineral particles of essentially a uniform shape and size. Such particles are prepared as described in PCT Publication WO 2019/215539.
  • inks utilizing polymeric precision shaped grain mineral particles of essentially a uniform shape and size could be prepared by incorporating surface-modified nanoparticles into the ink.
  • curable compositions that are capable of being printed at room temperature that include a curable latex, polymeric precision shaped grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles.
  • latex as used herein is consistent with the common understanding in the polymeric arts and refers to a dispersion in water or an aqueous mixture of polymer particles.
  • the latexes disclosed herein are curable materials that form a polymeric matrix upon drying and curing.
  • (meth)acrylate refers to monomeric acrylic or methacrylic esters of alcohols. Acrylate and methacrylate monomers or oligomers are referred to collectively herein as “(meth)acrylates”. Materials referred to as “(meth)acrylate functional” are materials that contain one or more (meth)acrylate groups.
  • room temperature and “ambient temperature” are used interchangeably to mean temperatures in the range of 20°C to 25°C.
  • adjacent as used herein when referring to two layers means that the two layers are in proximity with one another with no intervening open space between them. They may be in direct contact with one another (e.g. laminated together) or there may be intervening layers.
  • polymer and “macromolecule” are used herein consistent with their common usage in chemistry. Polymers and macromolecules are composed of many repeated subunits. As used herein, the term “macromolecule” is used to describe a group attached to a monomer that has multiple repeating units. The term “polymer” is used to describe the resultant material formed from a polymerization reaction.
  • alkyl refers to a monovalent group that is a radical of an alkane, which is a saturated hydrocarbon.
  • the alkyl can be linear, branched, cyclic, or combinations thereof and typically has 1 to 20 carbon atoms. In some embodiments, the alkyl group contains 1 to 18, 1 to 12, 1 to 10, 1 to 8, 1 to 6, or 1 to 4 carbon atoms.
  • alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, cyclohexyl, n-heptyl, n-octyl, and ethylhexyl.
  • alkylene refers to a divalent group that is a radical of an alkane.
  • the alkylene can be straight-chained, branched, cyclic, or combinations thereof.
  • the alkylene often has 1 to 20 carbon atoms. In some embodiments, the alkylene contains 1 to 18, 1 to 12, 1 to 10, 1 to 8, 1 to 6, or 1 to 4 carbon atoms.
  • the radical centers of the alkylene can be on the same carbon atom (i.e., an alkylidene) or on different carbon atoms.
  • heteroalkylene refers to a divalent group that includes at least two alkylene groups connected by a thio, oxy, or -NR- where R is alkyl.
  • the heteroalkylene can be linear, branched, cyclic, substituted with alkyl groups, or combinations thereof. Some heteroalkylenes are poloxyyalkylenes where the heteroatom is oxygen such as for example,
  • curable compositions are capable of being printed at room temperature. By capable of being printed it means that the compositions can be printed, but the compositions do not necessarily have be printed, they can be applied in other ways such as coating methods.
  • curable composition and “ink” are used interchangeably.
  • the curable composition comprises a curable latex, polymeric precision shaped grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles.
  • the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition.
  • the curable composition is thermally curable.
  • the curable composition upon deposition on a surface is heated to a temperature to dry and cure it.
  • the temperature required to cure the deposited curable composition can vary, typically being in the range of 150-180°C (300-350°F).
  • the curable composition includes at least one latex.
  • a latex is a dispersion in water or an aqueous mixture of a polymer particles.
  • the latexes disclosed herein are curable materials that form a polymeric matrix upon drying and curing.
  • a wide variety of latexes are suitable.
  • Particularly suitable latexes include styrene-butadiene emulsion polymers and (meth)acrylate emulsion polymers.
  • suitable latexes include the ROVENE polymers commercially available from Mallard Creek Polymers, Charlotte, NC.
  • a wide variety of polymeric precision shaped grain mineral particles are suitable for use in the curable compositions. These particles have been incorporated into abrasive cleaning articles that have been found to give excellent scouring properties without scratching, as described in PCT Publication No. 2019/215539. Scratching can be measured in a variety of ways such as Schieffer Scratch performance.
  • the cleaning articles have a substrate with abrasive particles dispersed on the surface of the substrate.
  • the abrasive particles are polymeric precision shaped grain mineral particles.
  • the polymeric precision shaped grain mineral particles were prepared according to the disclosure of US Patent No. 8,142,531 (Adefris et al.).
  • the polymeric precision shaped grain mineral particles may be any three-dimensional shape such as, but not limited to a pyramid, cone, block, cube, sphere, cylinder, rod, triangle, hexagon, square, and the like.
  • the organic abrasive particles are precision shaped grains that are triangular in shape.
  • the formed abrasive particles were prepared by molding alumina sol gel in equilateral triangle-shaped polypropylene mold cavities. The draft angle between the sidewall and bottom of the mold is typically about 98 degrees. After drying and firing, the resulting formed abrasive particles have an average particle size of 50 - 1000 micrometers. In some embodiments, the average particle size of 200 - 700 micrometers.
  • the loading of polymeric precision shaped grain mineral particles present in the curable composition of this disclosure can vary depending upon a variety of factors. Typically, the loading of the polymeric precision shaped grain mineral particles is below 5.0 weight % based on the total weight of the curable composition. In some embodiments, the loading of the polymeric precision shaped grain mineral particles is 1.0 - 5.0 weight % based on the total weight of the curable composition.
  • the curable compositions of this disclosure comprise surface-modified metal oxide nanoparticles.
  • These metal oxide nanoparticles are surface-treated nanoparticles, which means that a surface treatment agent has been applied to the metal oxide nanoparticles to at least partially modify the surface of the metal oxide nanoparticles.
  • the surface treatments are generally adsorbed or otherwise attached to the surface of the metal oxide nanoparticles.
  • the surface treatment agents are covalently bonded to the metal oxide nanoparticles.
  • the average particle size is less than 200 nanometers. In some embodiments, the average particle size is 1-125 nanometers.
  • metal oxide nanoparticles are suitable.
  • metal oxide nanoparticles include zirconia, titania, and silica.
  • Silica is particularly suitable metal oxide nanoparticle (silica is considered to typically classified as a metal oxide nanoparticle since silicon is classified as a metaloid).
  • suppliers of silica particles including Nalco Chemical Co., Nissan Chemical Co., and WR Grace.
  • particularly suitable silicas are those available from Nalco Chemical Co. under the trade designation "Nalco” such as “Nalco 2326”.
  • the surface-modified metal oxide nanoparticles are silane-modified silica particles.
  • the nanoparticles are surface treated to improve compatibility with the composition components and to keep the nanoparticles non-associated, non-agglomerated, or a combination thereof in the coatable, curable composition.
  • the surface treatment aids the compatibility of nanoparticles with the latex composition.
  • the surface treatment used to generate the surface-treated nanoparticles is a silane surface treatment agent.
  • the silane surface treatment agent covalently bonds with the surface of the metal oxide particle.
  • Silane surface treatment agents are well known and readily available. A wide variety of silane surface treatment agents are suitable.
  • the silane surface treatment agents are of the general structure: R a R b R c Si-X where each R a , R b , R c , is independently an alky or alkoxy group with the proviso that at least one of R a , R b , and R c , is an alkoxy group with 1-3 carbon atoms.
  • Many commercially available silane treatment agents have R a , R b , and R c as the same alkoxy group, typically methoxy or ethoxy.
  • the X group is typically a polyether group (an alkyl terminated heteroalkyl ene group).
  • polyether groups examples include polyethylene oxide (-(O-CEh-CEh T) and polypropylene oxide (-(O-CEh- CHMe) r -T) groups, where r is an integer of one or greater, and T is a terminal group, typically a hydrogen atom or an alkyl group.
  • suitable silane surface treatment agents is the commercially available surface treatment agent SILQUEST A-1230 (a polyether-functional silane) from Momentive Performance Materials Inc., Waterford, NY.
  • the amount of surface-modified metal oxide nanoparticles present in the curable composition can vary but is generally a minor component in the total composition. In some embodiments, the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition.
  • metal oxide nanoparticles are suitable for use in the curable compositions of this disclosure.
  • class of materials known as “fumed silica” are not suitable for use in the curable compositions of this disclosure.
  • Fumed silica also known as “pyrogenic silica” because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three- dimensional secondary particles which then agglomerate into tertiary particles. While not wishing to be bound by theory, it is believed that the agglomeration and formation of three-dimensional paticles makes fumed silica different from the surface-modified metal oxide nanoparticles of the present disclosure, and therefore fumed silica behaves differently. When fumed silica was tried in curable compositions of this disclosure, it was found that the advantages observed with the use of surface-modified metal oxide nanoparticles were not obtained.
  • the abrasive articles comprise a non-woven substrate layer with a first major surface and a second major surface, and an array of a plurality of abrasive dots.
  • the abrasive dots comprise a dried and cured polymeric latex comprising polymeric precision shaped grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles.
  • the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition that forms the abrasive dots.
  • the abrasive articles of the current disclosure comprise a non-woven substrate.
  • the substrate primarily is described as being a nonwoven, the substrate can be other suitable materials known in the art, including, a film or a foam.
  • the substrate is a nonwoven web constituted of a network of synthetic fibers or filaments.
  • the nonwoven web is first impregnated with a binder resin.
  • the substrate can be impregnated with the binder resin by any means known in the art.
  • the binder resin is roll-coated onto the substrate. The coated substrate is then dried and the binder resin is cured.
  • the abrasive articles also comprise an array of a plurality of abrasive dots.
  • the abrasive dots comprise a dried and cured polymeric latex comprising polymeric precision shaped grain mineral particles of essentially a uniform shape and size; and surface- modified metal oxide nanoparticles.
  • the abrasive dots are dots of the curable compositions described above that have been deposited on the substrate surface and have then been dried and cured.
  • the dots comprise a dried and cured latex comprising polymeric precision shaped grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles.
  • the dried and cured latex comprises a styrene-butadiene emulsion polymer latex or a (meth)acrylate emulsion polymer latex that has been cured and dried. Suitable latexes have been described above.
  • the polymeric precision shaped grain mineral particles have been described above. Typically, the particles have an average particle size of 50 - 1000 micrometers. In some embodiments, the average particle size of 200 - 700 micrometers. Typically, the loading of the polymeric precision shaped grain mineral particles is below 5.0 weight % based on the total weight of the curable composition used to form the abrasive dots. In some embodiments, the loading of the polymeric precision shaped grain mineral particles is 1.0 - 5.0 weight % based on the total weight of the curable composition used to form the abrasive dots.
  • the average particle size is less than 200 nanometers. In some embodiments, the average particle size is 1-125 nanometers. In some embodiments, the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition that forms the abrasive dots. In some embodiments, the surface-modified metal oxide nanoparticles are silane-modified silica particles. Particle size can be determined in a variety of ways, including Transmission Electron Microscopy (TEM).
  • TEM Transmission Electron Microscopy
  • the dot size is 0.50-8.0 millimeter in diameter.
  • the dots are 1.0-5.0 millimeters in diameter.
  • the method of preparing an abrasive article comprises providing a non- woven substrate layer with a first major surface and a second major surface, providing a curable and printable composition, printing the curable and printable composition onto the second major surface of the non-woven substrate layer in an array of dots, drying and curing the curable and printable composition dots.
  • Non-woven substrates are described above.
  • the curable and printable composition has been described in detail above.
  • the curable and printable composition comprises a curable latex, polymeric precision shaped grain mineral particles of essentially a uniform shape and size, and surface-modified metal oxide nanoparticles, where the surface-modified metal oxide nanoparticles are present at a loading of 0.1 - 5.0 weight % based on the total weight of the curable composition.
  • the curable composition is printable at room temperature, and curable at a temperature of 150-180°C (300-350°F).
  • a wide variety of printing techniques are suitable.
  • suitable printing techniques are screen printing and inkjet printing.
  • Screen printing is particularly suitable for preparing the dots of curable composition on a non-woven substrate.
  • the formed abrasive articles can be tested by a wide range of techniques.
  • One particularly suitable test is the measurement of scratching. Scratching can be measured in a variety of ways such as Schieffer Scratch performance.
  • a comparison of the exemplary articles versus comparative articles are presented. These examples demonstrate that the use of surface-modified metal oxide nanoparticles in the curable compositions provides printed abrasive dots that have superior consistency and also give superior scratch performance.
  • Surface modified nanoparticles were used to improve the flow and visual appearance of polymeric based shaped abrasive particle slurries without the addition of surfactants and/or lubricants in making screen-printed articles.
  • nm nanometers
  • pm micrometers
  • kg kilograms
  • cm centimeters
  • g grams
  • °C degrees Centigrade
  • °F degrees Fahrenheit
  • mm millimeters
  • m/min meters per minute
  • dPa.s decipascal second.
  • Sample preparation Both a diluted and stock (original) solution were prepared for TEM analysis.
  • the diluted sample was prepared by sonicating the stock solution for 15 minutes and dropping 3 drops into 20 mL of distilled, deionized water using a glass pipet. From this solution, 5 pL drops were each deposited on the light side of 200M Cu/UA TEM grids using an Eppendorf pipet. These grids were stored in open tins in a desiccator to dry before imaging.
  • Images were acquired on a FEI Osiris TEM (FEI Company, Hillsboro, OR) operating at 200 kV. Magnifications of 2300x, 3600x, 6300x, and 8900x were used. The 2300x images did not resolve the particles well enough for accurate measurement. Image processing was performed using the NIH ImageJ software program (Public Domain). A total of 37 images were processed; 6 of the 3600x diluted sample, 21 of the 6300x diluted sample, 10 of the 8900x diluted sample, and 10 of the 8900x original sample.
  • the generated equivalent area can be utilized to calculate an equivalent particle diameter with the following equation: d eq
  • Schiefer Scratch test This test method was used to determine/differentiate the relative scratch pattern of different mineral blends the coated nonwoven scouring materials according to disclosure of U.S. No. 5,626,512 (Palaikis et al.). The nonwoven scouring materials tested were cut into a circular pad (8.25 cm in diameter). The test was carried out using Frazier Schiefer testing machine (available from Frasier Precision Company of Gaithersburg, Maryland). The machine was set up with 6.8 kg head weight and set to stop after 1000 revolutions with water applied to the surface of the circular acrylic work piece (10.16 cm in diameter) at a rate of 40-60 drops per minute. Scratch patterns on the disc were observed and reported using the Schiefer scratch acceptance criteria in Table 1. Table 1
  • An image of the printed particles for each example was capturing using an optical microscope Keyence VHX-7000 microscope with VH-ZST lens (available from Keyence, Osaka, Japan). The magnification was 200X.
  • Sample Preparation A printed sample for each example was placed on a top- illuminated copy stand to be photographed by an Olympus OM-D E-Ml camera (available from Olympus America Inc., PA, USA). The camera was positioned above the example at a distance that would capture the entire printed non-woven. An image of each example was captured using automatic exposure. The images were transferred to a computer and opened with IMAGEPRO Premier software (Media Cybernetics, v. 9.4.1). The maximum and minimum diameters and the circularity were calculated and shown in histogram fig. 2 and fig. 3. Definitions of the parameters calculated by IMAGEPRO Premier
  • the maximum and minimum diameters are the longest and shortest diameters, respectively, that pass through the centroid of the object.
  • the Circularity was defined as (4*Area) / ⁇ *MaxFeret A 2), where MaxFeret was the maximum diameter that would be measured with a caliper if the adhesive dot was a free-standing 2D object.
  • Example preparation The preparation of Silica nanoparticles
  • the nanoparticle sol was weighed into a 3 -neck round bottom flask that was equipped with an overhead mixer and a water-cooled condenser. The flask was placed in an oil bath and heated with stirring to 50°C overnight. The flask was then removed from the oil bath and allowed to cool to room temperature with stirring. A percent solids determination via drying at 150°C was determined.
  • the modified nanoparticle sol was used without any additional workup. 20nm and 75nm modified nanoparticles were prepared the same way as 5nm but using NP-2 and NP-3 instead of using NP-1 as a reactant. (See Table 2) Table 2
  • TEM measurement of the NP-3 equivalent diameters was completed using image analysis routines in the NIH ImageJ software program. Each data set was taken at different random locations on the TEM grid. Mean particle size by equivalent diameter was 73.4 nm and maximum particle size measured was 123.6 nm. The representative TEM are shown in Fig. 1.
  • the combination of silica nanoparticles or fumed silica, and shaped abrasive particles were prepared according to the formulations in Table 4 by pneumatic mixer; the viscosity of the mixers was approximately 65-85 dPa.s.
  • the precursor resins were transferred using peristaltic pump and then printed on the non- woven substrate using a standard rotary screen-printing apparatus.
  • the screen printer used a stencil comprising through-holes which were 2 mm in diameter.
  • the non-woven substrate was sent through the screen printer at speed of 1.7 m/min to deposit respective precursor resins as abrasive dots on the non-woven surface. After printing, the printed non-woven was cured in the oven 280°F (138°C) first for 3 minutes and 350°F (177°C) second for 3 minutes.
  • the formulation with silica nanoparticles demonstrated no processing issues.
  • the formulation without silica nanoparticles (CEX1) plugged the pump, the formulation was transferred by hand.
  • the sample with fumed silica (CEX2) also plugged the pump.
  • Image analysis was used to calculate two parameters for the collection of abrasive dots on each printed non-woven. Cumulative histograms of these parameters have the potential to distinguish between EX1 and CEX1 For example, the ratio of the max diameter to the minimum diameter in Fig.2 is less than 2 for over 90% of the dots on the EX1, while only about 60% of the abrasive dots on the CEX1 meet that criterion.

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Abstract

L'invention concerne des compositions durcissables qui comprennent des particules minérales, ayant des grains de forme précise, polymères, de latex durcissable, ayant essentiellement une forme et une grosseur uniformes, et des nanoparticules d'oxyde métallique à surface modifiée. Les nanoparticules d'oxyde métallique à surface modifiée sont présentes en une quantité de 0,1 à 5,0 % en poids par rapport au poids total de la composition durcissable. La composition durcissable est imprimable à la température ambiante et peut être utilisée pour former des articles abrasifs.
PCT/IB2021/052819 2020-04-21 2021-04-05 Additifs à base de nanoparticules à surface modifiée dans des compositions imprimables contenant des particules WO2021214576A1 (fr)

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Cited By (13)

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US11427740B2 (en) 2017-01-31 2022-08-30 Saint-Gobain Ceramics & Plastics, Inc. Method of making shaped abrasive particles and articles comprising forming a flange from overfilling
US11453811B2 (en) 2011-12-30 2022-09-27 Saint-Gobain Ceramics & Plastics, Inc. Shaped abrasive particle and method of forming same
US11472989B2 (en) 2015-03-31 2022-10-18 Saint-Gobain Abrasives, Inc. Fixed abrasive articles and methods of forming same
US11590632B2 (en) 2013-03-29 2023-02-28 Saint-Gobain Abrasives, Inc. Abrasive particles having particular shapes and methods of forming such particles
US11608459B2 (en) 2014-12-23 2023-03-21 Saint-Gobain Ceramics & Plastics, Inc. Shaped abrasive particles and method of forming same
US11643582B2 (en) 2015-03-31 2023-05-09 Saint-Gobain Abrasives, Inc. Fixed abrasive articles and methods of forming same
US11649388B2 (en) 2012-01-10 2023-05-16 Saint-Gobain Cermaics & Plastics, Inc. Abrasive particles having complex shapes and methods of forming same
US11718774B2 (en) 2016-05-10 2023-08-08 Saint-Gobain Ceramics & Plastics, Inc. Abrasive particles and methods of forming same
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US11453811B2 (en) 2011-12-30 2022-09-27 Saint-Gobain Ceramics & Plastics, Inc. Shaped abrasive particle and method of forming same
US11859120B2 (en) 2012-01-10 2024-01-02 Saint-Gobain Ceramics & Plastics, Inc. Abrasive particles having an elongated body comprising a twist along an axis of the body
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US11608459B2 (en) 2014-12-23 2023-03-21 Saint-Gobain Ceramics & Plastics, Inc. Shaped abrasive particles and method of forming same
US11926780B2 (en) 2014-12-23 2024-03-12 Saint-Gobain Ceramics & Plastics, Inc. Shaped abrasive particles and method of forming same
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US11549040B2 (en) 2017-01-31 2023-01-10 Saint-Gobain Ceramics & Plastics, Inc. Abrasive article including shaped abrasive particles having a tooth portion on a surface
US11427740B2 (en) 2017-01-31 2022-08-30 Saint-Gobain Ceramics & Plastics, Inc. Method of making shaped abrasive particles and articles comprising forming a flange from overfilling
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US11926019B2 (en) 2019-12-27 2024-03-12 Saint-Gobain Ceramics & Plastics, Inc. Abrasive articles and methods of forming same

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