EP3679101A1 - Composition pour la finition d'un substrat, en particulier de verre - Google Patents

Composition pour la finition d'un substrat, en particulier de verre

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Publication number
EP3679101A1
EP3679101A1 EP18759142.5A EP18759142A EP3679101A1 EP 3679101 A1 EP3679101 A1 EP 3679101A1 EP 18759142 A EP18759142 A EP 18759142A EP 3679101 A1 EP3679101 A1 EP 3679101A1
Authority
EP
European Patent Office
Prior art keywords
weight
composition
hard particles
substrate
particularly preferably
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18759142.5A
Other languages
German (de)
English (en)
Inventor
Peter EBERHART
Christian Jentgens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Microdiamant AG
Original Assignee
Microdiamant AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Microdiamant AG filed Critical Microdiamant AG
Publication of EP3679101A1 publication Critical patent/EP3679101A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • 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
    • C08K3/10—Metal compounds
    • C08K3/14—Carbides
    • 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
    • C08K3/38—Boron-containing compounds
    • 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
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/60—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which all the silicon atoms are connected by linkages other than oxygen atoms
    • C08G77/62—Nitrogen atoms
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron
    • 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
    • C08K2201/003—Additives being defined by their diameter

Definitions

  • composition for finishing a substrate in particular glass
  • the invention relates to a composition for the finishing of a substrate.
  • the composition is applied to the substrate, in particular on glass, coated, and improves the mechanical properties such as African ⁇ hardness, scratch resistance and Bruchsi ⁇ safety.
  • the composition contains a binding matrix of silazanes, and a crosslinking agent, as well as hard particles.
  • the displays of electronic devices are protected with glass.
  • this glass layer is often exposed to high loads in everyday life.
  • the manufacturers of such glasses have therefore tried to improve the scratch resistance and fracture resistance of the surface of such glasses.
  • Well-known examples are Gorilla Glass from Corning Inc., Dragontail from Asahi Glass Co. or Xensation from Schott North America. While the treated glasses often have good scratch resistance, breaking strength remains a challenge.
  • Silicon-containing polymers in particular polymers based on silazanes and siloxanes, are known in the prior art and have already been widely used for coating surfaces.
  • Known properties of silazanes / siloxanes for example, heat resistance and transparency (US7371433), anti-reflective properties (US2010092895), both resistance ⁇ ability to cracking and cracking (US2017210944), high refractive index (US2017210944), usefulness as anti-corrosion
  • compositions for coating substrates which hold the one hand, monomers or prepolymers siloxane and filler particles on the other hand ⁇ ent.
  • a curable silicone resin polymer with phosphorus particles and aggregated nanoparticles is shown.
  • CN106497412 and WO 2004/099327 coatings of silicone resin polymers and filler particles are shown.
  • US2017 / 0131591 shows a dielectric film on a substrate whose starting materials comprise siloxane polymers, siloxane oligomers and particles ⁇ 400 nm.
  • Such Caribbeanset ⁇ tongues can be selected on the basis of optical, temperature-resistant, moisture-repellent properties or because of their electrical conductivity.
  • fracture safety Polysiloxane-based structures proved to be only limited resistance even with the addition of fill ⁇ particles.
  • Such siloxane-based compositions with a highly crosslinked, rigid chemical structure have a high brittleness or too low impact resistance.
  • the composition should not significantly weight the material and not affect the optical and electrical properties of the material. It should be applicable to a variety of devices and shapes, including non-planar surfaces.
  • the object is achieved by a composition according to the independent claims.
  • the invention relates to a composition for processing a substrate, in particular for Verede ⁇ development of glass; a substrate finished with a composition according to the invention; a method for refining a substrate with a composition according to the invention; a kit comprising inter alia the composition according to the invention and the use of the composition for the refinement of various substrates.
  • the invention fulfills the above-mentioned purpose by, inter alia, introducing hard particles, in particular diamond particles, into the surface of the substrate.
  • the particles combine with the substrate via a binding matrix comprising silazanes on the one hand and a crosslinking agent on the other hand.
  • Silazanes, especially cycloo silazanes are preferred in the context of the invention over other starting materials, in particular also with respect to siloxanes and cyclosiloxanes.
  • compositions are comprehensively send pre-polymers of silazanes and particularly comprehensively Pre ⁇ polymers with cyclic structures of silazanes suitable for the refinement of the substrate.
  • the combination of ingredients of the composition imparts superior mechanical properties to the treated substrate, namely increased hardness and reduced brittleness.
  • the composition comprises a binder matrix based on silazanes, preferably cyclo-silazanes, and additionally comprising a crosslinking agent, wherein the crosslinking agent before ⁇ Trains t is an alkoxy silane of the form R-Si (OR) 3 or an alkylamine silane of the form R-Si (NR) 3 is. Furthermore, the composition comprises hard particles which have a Vickers hardness of more than 1200 HV1.
  • the silazanes are of the form ⁇ R3-S1 [-NH-S1R 2] n NH-SiR. 3
  • R independently of one another are either hydrogen atoms or organic substituents.
  • R are independently alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, hydroxyalkyl, hydroxialkenyl, hydroxyalkynyl, alkoxy, alkenoxy, alkynoxy, aryl -, Alkylsilyl group or one of the aforementioned organic substituents, additionally containing at least one keto group, an amine group or a hydroxyamine group.
  • n is still a natural number greater than 0.
  • the silazanes are preferably present in the composition in the form of oligomers or prepolymers.
  • the silazanes are of cyclic structure.
  • cyclic structure here means that the silazane chains are at least partially connected so that they form rings.
  • the cyclic structure is already there in the case of the oligomers or pre-polymeric silazanes in the composition, ie even before the crosslinking reaction.
  • organic polysilazane compound (cyclic di-Me / Me-hydro-silazane compound), which can be used under CAS no. 475645-84-2 is registered.
  • the binding matrix can be used in the context of the invention without siloxanes or cyclosiloxanes. More specifically, the composition may be free of siloxane-based prepolymers or oligomers or free of cyclosiloxanes. However, siloxane groups may be formed on the crosslinking agent as described below. It is an advantage of silazane-based binder matrices over siloxane-based binder matrices that they have better adhesion performance. Due to the reactivity of nitrogen-containing groups with respect to polar groups of the substrate and / or with respect to the surfaces of the filler particles, a composition according to the invention proves to be more mechanically stable after curing
  • silazane-based binder matrices over siloxane-based binder matrices that they better wet a substrate, especially a glass surface.
  • the cyclic basic structure of the silazanes proves to be particularly suitable in the context of the invention for reducing the brittleness of the surface finished with the composition and thus contributing to the fracture resistance.
  • Bonding matrices based on silazanes preferably cyclosilazanes
  • Binding matrices based on silazanes, preferably cyclosilazanes have a higher impact strength.
  • composition further contains a crosslinking agent, such as, alkoxy silane, alkylamine silane or isocyanate silane. It is preferred that the crosslinking agent is selected from the group consisting of alkoxy-silane or alkylamine-silane.
  • the crosslinking agent is selected from the group tetra-alkoxy-silane, trialkoxy-silane, tetra-alkylamine-silanes,
  • Tri-alkylamine-silane or mixtures thereof Tri-alkylamine-silane or mixtures thereof.
  • the crosslinking agent is most preferably of the form R-Si (OR) 3 or of the form R-Si (NR) 3 or mixtures thereof.
  • R-Si (OR) 3 or of the form R-Si (NR) 3 or mixtures thereof.
  • all R independently of one another are either hydrogen atoms or organic substituents.
  • the R are alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, hydroxyalkyl, hydroxialkenyl, hydroxyalkynyl, alkoxy, alkenoxy, alkynoxy, aryl, alkylsilyl Groups or one of the abovementioned organic substituents, additionally containing at least one keto group, an amine group or a hydroxylamine group.
  • crosslinking agent is triethoxysilyl-3-propylamine (CAS No. 919-30-2).
  • Silazanes preferably cyclosilazanes, and a crosslinking agent described above, in the presence of moisture at room temperature, form cross-links between the silazanes with each other as well as with the silazanes on the one hand and the substrate surface and hard particle surfaces on the other.
  • a matrix based on a polysilazane available from Merck under the trade name may be used Durazane is distributed.
  • These cross-linked binder matrix in the presence of moisture and can bond covalently with the sub ⁇ stratober Assembly and preferably also with the hard Parti ⁇ kelober moral.
  • composition contains hard particles which have a Vickers hardness of more than 1200 HV1.
  • the hardness of the particles is determined with a measuring load of 1 Newton.
  • the Mes ⁇ solution takes place according to ISO 6507-1: 2005 standard.
  • the hard particles are preferably provided in the form of a suspension and mixed with the other components of the composition.
  • the composition may contain other ingredients.
  • the composition may contain solvents and / or aerosols.
  • the hard particles are selected from the materials diamond, alumina, silicon carbide, boron nitride or boron carbide and mixtures thereof. Particularly preferred are hard particles of diamond, because particles of this Ma ⁇ terials can be well controlled in the making. Particle size and surface structure are easily adjustable. Diamond particles are easy to polish.
  • hard particles of two different size ranges are combined in the composition.
  • a first part of the hard particles has a median diameter of 0.5 to 1 ⁇ m.
  • a second portion of the hard particles is less than 0.2 ym, and more preferably between 0.002 and 0.1 ym in size (median diameter).
  • Particles of this preferred sizes are particularly homogeneous in the matrix contribute what transparency and gleichzes- sige mechanical strength of the finished surface verbes ⁇ sert.
  • the particle sizes of the hard particles are distributed bimodally, where ⁇ is at a first maximum in the frequency distribution for particles greater than 400 nm and a second maximum of the frequency distribution for particles smaller than 350 nm.
  • the particles penetrate from the under ⁇ different handy size areas of different depths in the substrate to be refined.
  • hard particles with a small median diameter of less than 0.2 .mu.m, and particularly preferably between 0.002 and 0.1 .mu.m can penetrate far into the substrate surface and, after curing, together with the binding matrix impart mechanical resistance to an inner layer facing the substrate.
  • the hard particles with a larger median diameter of 0.5 to 1 ⁇ m can penetrate less far into the substrate surface and, after curing, together with the binding matrix impart mechanical resistance to an upper layer facing away from the substrate.
  • a gradient forms with the mass of the individual particles increasing toward the surface.
  • the hard particles of different size ranges are defined combination in the composition, wherein the hard particles out of three size ranges are ⁇ selected.
  • a second part of the hard particles, preferably 20 to 40% by weight of all hard particles, particularly preferably about 33% by weight of all hard particles can be hard particles having a median diameter of 351 to 649 nm, preferably 400 to 600 nm, particularly preferably 450 up to 550 nm be ⁇ stand.
  • a third part of the hard particles preferably 20 to 40% by weight of all hard particles, particularly preferably about 33% by weight of all hard particles, can be hard particles having a median diameter of 650 to 850 nm, preferably 700 to 800 nm, be ⁇ particularly preferably 725 to 775 nm exist.
  • the particle sizes of the hard particles are distributed in a multi-modal manner, wherein a first maximum of the frequency distribution for particles with median diameter is greater than 650 nm, a second maximum of the frequency distribution for particles with median diameter less than 350 nm, and a third Maxi mum ⁇ of the frequency distribution for particles having median fürmes- ser 351-649 nm.
  • the smallest hard particles most penetrate into the substrate to be refined, where they are, preferably covalently connect in egg ⁇ ner innermost layer in about 30 to 50ym depth, with the matrix.
  • the particles of the medium size range penetrate less far into the substrate to be refined. They form a second anschlies ⁇ send to the innermost layer layer and connecting there with the matrix.
  • the Parti ⁇ angle of the highest size range form the outermost layer on the surface of the substrate to be finished.
  • the so ausbil ⁇ Dende gradient in the size of the embedded particles under ⁇ supports the stability and strength of the finished lens, in that there is in each case a ratio of toughness and hardness adapted to the mechanical load per layer.
  • the hard particles In order to ensure the most uniform possible distribution of the mass of hard particles over all layers, the hard particles ideally originate in equal parts from the three aforementioned size ranges. It has proved to be advantageous to choose proportions of 20-40 wt .-% per size range of the total particle mass. Particularly advantageous are proportions of 25-35 wt .-% per size range of the Intelartiserikelmas- se.
  • the invention also covers compositions as described above in which the particle sizes of the hard particles are distributed in a multi-modal manner so that they have more than three maxima of the frequency distribution in the preferred size range of 0.002 to 1 ⁇ m.
  • the provision of such a plurality of particles with different median diameters is not preferred due to production engineering considerations.
  • the relative size distribution of the particles in the Caribbeanset ⁇ -cutting is a CPS Disc Centrifuge instrument be ⁇ true.
  • the detailed measurement method can be found in the following examples.
  • the composition may further contain a solvent.
  • Suitable solvents are ethyl acetate, butyl acetate, hexane, higher alkanes, tetrahydrofuran, and mixtures thereof.
  • Higher alkanes are aliphatic hydrocarbons having the empirical formula C n H2 n + 2, where n is greater than 5.
  • Suitable solvents ⁇ medium can im- complete wetting of the surface and promote the dispersion of the hard particles in the fluid and in the cured matrix.
  • crosslinking agent From 1 to 10% by weight of crosslinking agent, preferably from 5 to 10% by weight.
  • hard particles preferably 0.5 to 5% by weight, particularly preferably 1 to 2.5% by weight, which hard particles have a median diameter of 0.5 to 1 ⁇ m;
  • hard particles preferably 0.5 to 5% by weight, particularly preferably 1 to 2.5% by weight, which hard particles have a median diameter of less than 0.2 ⁇ m, and particularly preferably between 0.002 and 0.1 ⁇ m ;
  • hard particles preferably 0.5 to 5% by weight, particularly preferably 1 to 2.5% by weight, which hard particles have a median diameter of at least 0.75 ⁇ m and up to 1 ⁇ m;
  • hard particles preferably 0.5 to 5% by weight, particularly preferably 1 to 2.5% by weight, of which hard particles have a median diameter of at most 0.2 ym, and more preferably between 0.002 and 0.19 ym;
  • hard particles preferably 0.5 to 5% by weight, particularly preferably 1 to 2.5% by weight, which hard particles have a median diameter of less than 0.75 ⁇ m and more than 0.2 ⁇ m, particularly preferably between 0.3 and 0.6 ym on ⁇ wise;
  • Another aspect of the invention relates to a substrate, in particular glass, finished with the inventive Supreme Set ⁇ wetting.
  • the substrate has a surface hardness> 9 on the Mohs scale.
  • the surface hardness can also be determined using the "Taber Abraser" test, a well-known test for the abrasion resistance of organic coatings
  • the surface hardness can be determined by a universal hardness test using nanoindentation. The hardness can also be referred to as Vickers hardness or Martens hardness
  • Another aspect of the invention relates to a method for
  • the composition is applied to the surface of the substrate, where it acts on the substrate ⁇ .
  • the substrate is uniformly applied to the surface.
  • the job can using a spatula he ⁇ follow.
  • the composition is preferably applied in excess, more preferably with a layer thickness of more than 100 ⁇ m, to the substrate.
  • the composition is placed under ambient conditions on the surface to be treated.
  • the moisture in the atmo sphere ⁇ , the alkoxy groups and / or nitrogen groups, in particular amino groups of the crosslinking agent and / or silazanes hydrolyze.
  • the reaction is favored by the presence of acid. Alcohol groups and / or amine groups are released.
  • the resultie ⁇ leaders hydroxysilyl groups on the silazanes and the crosslinking agent can then condense with hydroxyl groups / nitrogen groups, particularly amino groups or hydroxyl groups of other silazanes of the crosslinking agent at room temperature to a ⁇ network structure. It releases water and / or ammonia.
  • the hydroxysilyl groups resulting from the silazanes and the crosslinking agent may also condense at room temperature with the hydroxy groups of the substrate surface and with hydroxyl groups on the surface of the hard particles. It releases water.
  • the hydrolysis as well as the condensation take place at least at room temperature.
  • the matrix is preferably alive after 48 sawn Sonders preferably 24 hours in the substantially fully ⁇ cured.
  • the contact time is at least 6 minutes, preferably special ⁇ DERS preferably at least 10 minutes and most preferably at least 15 minutes. A longer exposure time causes a deeper penetration of the composition into the substrate.
  • the ⁇ borne composition After expiry of the exposure time of the still liquid portion is removed on the ⁇ borne composition, in particular polished.
  • the surface can be polished with a cloth, preferably with a microfiber cloth.
  • the Caribbeanset ⁇ Zung cures at room temperature. Curing may take 7 days, preferably 48 hours, more preferably 24 hours as from ⁇ closed apply.
  • the ease of execution under standard conditions is an advantage of the inventive method.
  • the application can be performed by a layman in a few steps and a short time.
  • the continuous network of Caribbeanset ⁇ wetting to the substrate can be achieved with appropriately chosen fluidity of the composition.
  • the applied layer can, under standard conditions, in particular room temperature, humidity, ambient air, natural light, cured ⁇ the.
  • the surface of the substrate is treated with an etchant prior to application of the composition.
  • the etchant is preferably an organic or mineral acid in aqueous solution, particularly preferably citric acid.
  • the etchant forms hydroxyl groups on the substrate surface, which can then form covalent bonds with the silazane matrix.
  • kits for processing a substrate comprising a composition described as ⁇ standing, and a usage instruction, illustrating in particular the steps of the method described above.
  • the kit allows a layman, a substrate is to refine ⁇ ner choice independently and in particular to harden its top ⁇ face.
  • the kit may, in a preferred embodiment, further comprise at least one putty for applying the composition and / or at least one polishing cloth.
  • the kit may comprise at least one etching agent.
  • composition of the invention for example, for upgrading of mobile phone displays, displays of other mobile ⁇ devices, displays of other electronic devices, for the finishing of windshields of vehicles, paint coatings of vehicles, ship parts, other vehicle parts, watch cases, watch factory parts, mechanical wearing parts, supply parts made of transparent materials such as glass, quartz, ceramics, zirconium, plastics, flat glass, technical lenses and glasses, products and components of medical technology.
  • transparent materials such as glass, quartz, ceramics, zirconium, plastics, flat glass, technical lenses and glasses, products and components of medical technology.
  • the composition was prepared in a beaker as follows:
  • the abovementioned diamond suspension may alternatively also contain between 1 and 20% by weight of diamond, preferably 5 and 10% by weight of diamond, particularly preferably 10% by weight.
  • a sample of the aqueous diamond suspension was strongly homogenized with the pipette, diluted and sonicated. The sample was then re-diluted until the sample was nearly clear. The measurement sample was again behan ⁇ delt with ultrasound.
  • the calibration standard used was a calibration standard with a PVC grain size of known grain size (0.483 ⁇ m, 1.385 g / ml density) available from CPS Instruments.
  • sucrose solutions were injected into the disc in the following ratios (injection amounts in ml, Table 2):
  • the size distribution of the particles can alternatively be determined with a Coulter Counter, for example a Coulter Counter from Multisizer, which leads essentially to the same results.
  • Example 3 The glass coating of a mobile phone display was rubbed with citric acid and the acid worked on the surface for 6 minutes.
  • the composition prepared according to Example 1 was thoroughly mixed and applied in excess to the surface with the aid of a spatula.
  • the composition worked on the surface for 15 minutes.
  • the top ⁇ surface was polished with a microfiber cloth.
  • the composition-finished surface cured for 48 hours at room temperature.
  • the Vickers hardness and Martens hardness of the coated glass ⁇ disk according to Example 2 were determined. Likewise, the Vickers hardness and Marten hardness of an identical but un- coated glass sheet (reference) determined. The results are shown in Table 3.
  • Martens hardness and Vickers hardness were determined according to standard DIN EN ISO 14577-1.
  • the abrasion resistance (Taber Abraser Test) of the exemplified coated glass pane was also determined and compared with the Ab ⁇ rubbing resistance of an uncoated glass sheet (reference). The results are shown in Table 4.
  • FIG. 1 denotes the background.
  • Reference numeral 2 denotes the non-penetrated part of the glass.
  • the composition After 15 minutes of exposure, the composition has penetrated about 33 ym into the glass.
  • the diamond particles are distributed uniformly over the penetration depth 3, 4, 5 of the composition. It can be seen that a gradient forms over the penetration area.
  • the lowest layer 3 contains the finest nano-particles. They have a median diameter of 180 nm. In an overlying layer 4 more nano-diamond particles are located. They have a median diameter of 560 nm. In the uppermost layer 5, diamond particles of coarser grain size can be seen. They have a median diameter of 825 nm.
  • the silazane-based matrix is diffused over all layers 3,4,5 of the penetration area.
  • the composition according to the invention can penetrate deeper into the substrate, which is certainly also covered by the invention.
  • penetration depths 5 of 85 ⁇ m and more can result.
  • FIG. 2 shows the particle distribution in the diamond suspension according to Example 1 measured with a CPS disk centrifuge.
  • the x-axis shows the particle diameter in ym.
  • the y-axis shows the relative weight fraction in the Messpro ⁇ bene composition in%. It can be seen that the particles are distributed tri-modally.
  • a first maximum is for particles with a diameter of 180 nm.
  • a second maximum is included Particles with a diameter of 560 nm and a third maximum is with particles with a diameter of 826 nm.
  • FIG. 3 shows the particle distribution in an alternative diamond suspension as measured by a disk centrifuge. It can be seen that the particles are distributed bi-modally.
  • a ers ⁇ tes maximum is particles having a diameter of 178 nm.
  • a second maximum is particles having a diam ⁇ ser of around 827 nm.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

L'invention concerne une composition pour la finition d'un substrat, notamment de verre, contenant une matrice de liaison constituée de silazane, de préférence de cyclo-silazane, et d'un agent de réticulation, cet agent de réticulation étant de préférence un alcoxy-silane ou un alkylamine-silane. La composition contient en outre des particules dures, lesquelles présentent une dureté Vickers supérieure à 1200 HV1. La matrice, y compris les particules dures, pénètre dans la surface du substrat, ce qui permet d'améliorer la dureté et la résistance mécanique de la surface. Cette finition est particulièrement adaptée à la protection d'écrans de téléphones mobiles, d'écrans d'autres appareils mobiles et d'appareils électroniques.
EP18759142.5A 2017-09-04 2018-08-31 Composition pour la finition d'un substrat, en particulier de verre Withdrawn EP3679101A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17189142.7A EP3450516A1 (fr) 2017-09-04 2017-09-04 Composition de transformation d'un substrat, en particulier de verre
PCT/EP2018/073514 WO2019043182A1 (fr) 2017-09-04 2018-08-31 Composition pour la finition d'un substrat, en particulier de verre

Publications (1)

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EP3679101A1 true EP3679101A1 (fr) 2020-07-15

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EP18759142.5A Withdrawn EP3679101A1 (fr) 2017-09-04 2018-08-31 Composition pour la finition d'un substrat, en particulier de verre

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