WO2008078346A1 - Revêtement hybride qui est hydrophobe et résistant à l'humidité pour matériaux polymères composites renforcés déposés par pecvd - Google Patents

Revêtement hybride qui est hydrophobe et résistant à l'humidité pour matériaux polymères composites renforcés déposés par pecvd Download PDF

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WO2008078346A1
WO2008078346A1 PCT/IT2007/000604 IT2007000604W WO2008078346A1 WO 2008078346 A1 WO2008078346 A1 WO 2008078346A1 IT 2007000604 W IT2007000604 W IT 2007000604W WO 2008078346 A1 WO2008078346 A1 WO 2008078346A1
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Prior art keywords
coating
hybrid coating
laid
humidity
polymer materials
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PCT/IT2007/000604
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English (en)
Inventor
Anna Cremona
Espedito Vassallo
Franco Taddei
Norman Fleck
Angelo Merlo
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Ce.S.I. Centro Studi Industriali Di Taddei Ing. Franco & C. S.A.S.
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Priority to EP07827658A priority Critical patent/EP2094798A1/fr
Publication of WO2008078346A1 publication Critical patent/WO2008078346A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/62—Plasma-deposition of organic layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/048—Forming gas barrier coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/12—Chemical modification
    • C08J7/16—Chemical modification with polymerisable compounds
    • C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2201/00—Polymeric substrate or laminate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers

Definitions

  • the present invention refers to the application of the Plasma Enhanced Chemical Vapour Deposition (PECVD) process for coating reinforced composite polymer materials to be used for structural mechanical applications in which a high geometrical stability is required.
  • PECVD Plasma Enhanced Chemical Vapour Deposition
  • a possible field of application of the present invention is the sector of operating machines (for example, machine tools, measuring machines, machines for high accuracy mechanical working, robots, etc. ) .
  • the structural elements of the operating machine must have a high dimensional stability since possible distortions of a geometric nature are transformed into errors that, if not p reve ⁇ ted or corrected, impair functionality and accuracy of the mec ⁇ an ⁇ - cs ' anc * therefore in the end the quality of the worked pi ece or ⁇ e performed measure.
  • reinforced composite polymer materials for example with aramide, carbon (CFRP) or glass (GFRP) fibres
  • Composite materials are defined as two-phase hybrid materials, in which one phase is composed of a polymer matrix (that can be a thermoplastic or thermosetting resin) , while the second phase is composed of (short or long) fibres, among which the most common ones are carbon, glass and aramide (ex. Kevlar) fibres.
  • Matrix and fibres are in a suitable stoichiometric ratio. Fibres can further assume different orientations inside the matrix itself, according to functional requirements that have to be satisfied.
  • the composite materials can further confer to components of operating machines a high dimensional stability from the point of view of thermal distortions .
  • a typical characteristic of composites based on a polymer matrix that cannot be found in metals is the trend to absorb humidity from the outside environment.
  • humidity absorption implies a dimensional variation whose value is given by a swelling coefficient ⁇ (defined below). In the majority of composites, the humidity absorption can be attributed to the matrix.
  • the composite materials can therefore be unstable from the dimensional point of view, giving rise to distortions.
  • These geometric distortions can be generated, for example, also by the accidental contact of the surface of the composite material with fluids commonly used during the machine operation (such as, for example, cutting fluids used as lubricants-coolants in the tool-piece contact area when working or as means for removing chips from the cutting area) .
  • fluids commonly used during the machine operation such as, for example, cutting fluids used as lubricants-coolants in the tool-piece contact area when working or as means for removing chips from the cutting area
  • Water diffusion inside the polymer resin can generate a series of other undesired effects, such as: variation of structural properties, generation of local stresses that can give rise to micro-cracks, hydrolysis, and in general irreversible ageing phenomena.
  • water absorbed on the ground by the composite material is completely released in the space, determining shrinkage phenomena of structural parts/components that have very severe dimensional stability tolerances.
  • the hybrid coating to which the present invention refers prevents above mentioned geometric distortions and undesired effects from occurring (thereby preventing measuring and working errors that would happen in case of use of the composite material for making structural elements of an operating machine) .
  • the polymer composite material reinforced with a pair of protecting layers that compose a water-repellent and humidity-proof coating is coated through PECVD.
  • the modification of the composite surface does not modify in any way the structural properties of the "bulk", namely the composite itself that composes the substrate, and increases its dimensional stability.
  • PECVD Plasma Enhanced Chemical Vapour Deposition
  • the Plasma Enhanced Chemical Vapour Deposition treatment is a surface modification process for a material consisting in generating a thin film on the material surface exposed to plasma.
  • Plasma is an ionised gas in which electrons and ions move independently and are not mutually linked like in the remaining states of the matter. As such, plasma is considered the fourth state of the matter.
  • the PECVD method uses a gas discharge to create active chemical species (radicals or ions) starting from a precursor monomer under vapour phase. These chemical species react with the material surface to be treated giving rise to a thin deposit (or film) having specific chemical-physical properties. Fragmentation of the precursor monomer (breakage of chemical links and possible ionisation) therefore does not occur through a thermal activation, but occurs by means of energy supplied to particles being present in the plasma. This makes it possible to perform the process at ambient temperature (for this reason, it is also called "cold plasma'') .
  • the PECVD technology provides for the use of a vacuum chamber within which the substrate to be subjected to surface treatment is placed.
  • Such chamber is evacuated by means of a pumping system that, in addition to taking care of reaching vacuum, must keep the pressure during the process constant.
  • Typical working pressures are included in a range of 0.1 ⁇ 50 Pa.
  • Plasma is generated through an electric field whose frequency is on the order of MHz.
  • the substrate After having inserted the sample in the reactor and having reached a vacuum, the substrate can be subjected to a short surface cleaning treatment through inert gas plasma (typically argon) to remove possible contaminants and impurities present on the surface of the material to be treated.
  • the substrate can also be subjected to a pre- treatment, usually with argon, oxygen or hydrogen plasma, whose purpose is improving the film adherence to the substrate.
  • the vaporised precursors are inserted in the vacuum chamber. Turning on the radio-frequency discharge generates fragmentation, excitation and ionisation of precursors.
  • the active species generated in the plasma phase are chemically linked to the substrate surface, thereby generating the coating layer.
  • the coated material can afterwards be possibly subjected to a final, non-PECVD treatment, that confers it further functional properties .
  • the PECVD technology has peculiar advantages with respect to traditional techniques (especially galvanic ones) , first of all the chance of depositing films with desired chemical-physical characteristics operating, as already stated, simply on the above mentioned process parameters.
  • advantages there are the low environmental impact and the limited consumption of energy and process gases and vapours.
  • it is important to underline that the deposition process does not need high temperatures, but occurs at ambient temperature since the necessary energy for chemical reactions is supplied by particles present in the plasma.
  • PECVD Through PECVD, it is possible to confer specific surface properties to a material, without modifying substrate properties and without excessively increasing costs.
  • functional properties there are mechanical . properties such as hardness and low friction coefficient; opto-electronic properties such as low dielectric constant; chemical properties such as permeability or impermeability to gas and vapours (barrier property) , hydrophobicity or hydrophily, biocompatibility, resistance to corrosion and humidity, paintability.
  • the PECVD process has been used for obtaining materials that combine structural properties typical of composite materials
  • PECVD Plasma Enhanced Chemical Vapour Deposition
  • This patent deals with a process for making a surface hardening coating, to be applied onto substrates made of plastic material, such as plane displays.
  • Such coating is composed of carbon, hydrogen, silicon and oxygen and is applied to the substrate through PECVD. Through such process, a coating is obtained that is transparent, resistant to abrasion, water-repellent, and scarcely permeable to humidity, oxygen, helium and other vapours.
  • Patent WO00989 June 2000
  • This patent deals with a process for obtaining materials characterised by a reduced dielectric constant to be used in making semiconductor devices containing integrated circuits.
  • the process provides for the deposition of two layers of oxides on interconnecting structures of the two integrated circuits, structures that generally assume the appearance of metal lines that mutually connect the integrated circuits according to a particular scheme.
  • the first layer of oxides is obtained through High- Density Plasma Deposition (HPD) .
  • HPD High- Density Plasma Deposition
  • Such layer is doped through fluorine in order to reduce the dielectric constant of the laid layer.
  • the second layer of oxides is laid through PECVD.
  • Such layer is doped through phosphor in order to keep mobile ions (for example, sodium and potassium ions) whose migration towards the interconnecting structures could impair the electronic device operation.
  • This second layer is an optimum barrier against humidity. This is fundamental since if humidity reaches the above first layer and reacts with fluorine, hydrofluoric acid is formed, that corrodes the interconnecting structures.
  • the process finally provides for a chemical mechanical polishing operation to level the upper surface of the above second layer of oxides.
  • This patent deals with a coating characterised by a carpet of fibres with nanometre sizes and hydrocarbon nature. Fibres directly grow on the substrate to be coated due to the deposition in some points of the substrate of a catalyst, and afterwards adding the hydrocarbon precursor from which nanofibres originate. The nanofibre growth therefore occurs only in substrate points in which the catalyst has been laid. Nanofibres and free substrate surface included between them are afterwards coated with a hydrophobic and/or lipophobic polymer whose deposition is performed through PECVD. Textile sector Patent MI2002A000360 (February 2002)
  • This patent deals with the restoration through plasma of paper materials stored in archives and libraries. Deterioration of books and archive materials is due to the cellulose decay that can be caused by many factors, such as acid hydrolysis, oxidising agents, light, environment pollution, presence of micro-organisms.
  • the treatment through PECVD is aimed to remove micro-organisms, to reduce surface stains intensity, to confer surface properties of barriers against gases and vapours and water-repellence .
  • the treatment through plasma is aimed to confer water-repellence properties to eyeglass lenses and optical devices.
  • the PECVD is used for sterilising and depositing anti-bacterial and anti-fouling coatings on biomedical devices.
  • the surfaces of materials having affinity for biologic components (proteins, cells, bacteria, algae, etc.) placed in non-sterile environments are subjected to deterioration due to the formation of bio-films with varying composition that "foul" the material and promote the adhesion and growth of bacteria, thereby modifying the performance of the medical device.
  • the deposition of non- fouling films of the PEO (Polyethylene Oxide) type on polymer materials for biomedical applications is currently being studied.
  • Reinforcing fibres of a composite material can for example be subjected to a plasma treatment in order to modify the chemical and physical surface properties of said fibres.
  • the fibre surface can be treated in order to increase its wettability and favour its adhesion to the polymer matrix within which the fibres are dispersed.
  • Plasma treatments can also be applied to reinforced composite polymer materials in order to increase their surface roughness.
  • Such treatment can be used in the chemical industry as method for preparing samples to be analysed under an electronic microscope to locate arrangement and orientation of particles inside the polymer matrix.
  • the coating of the present invention is an innovation since none of the studied application has as its aim the conferment of water-repellence and humidity barrier properties to said composite materials.
  • Object of the present invention is providing a hybrid coating for reinforced composite polymer materials (for example with aramide, carbon (CFRP) or glass (GFRP) fibres) to be used as structural elements in mechanical applications in which a high geometric stability is required, such as, for example, in the field of operating machines.
  • Such coating operates as protecting layer and is obtained by means of a Plasma Enhanced Chemical Vapour Deposition (PECVD) process.
  • PECVD Plasma Enhanced Chemical Vapour Deposition
  • Object of the present invention is providing a coating for reinforced composite polymer materials (for example with aramide, carbon (CFRP) or glass (GFRP) fibres) that can be used as structural elements in mechanical applications where a high geometric stability is required (such as, for example, in the field of operating machines) , so that said coating has specific desired properties.
  • reinforced composite polymer materials for example with aramide, carbon (CFRP) or glass (GFRP) fibres
  • CFRP aramide, carbon
  • GFRP glass
  • a further object of the present invention is providing a coating for reinforced composite polymer materials that can be obtained through a Plasma Enhanced Chemical Vapour Deposition (PECVD) process.
  • PECVD Plasma Enhanced Chemical Vapour Deposition
  • Another object of the present invention is providing a coating for reinforced composite polymer materials that is water-repellent and humidity-proof, thereby being a protecting layer for coated composite materials.
  • FIG. 1 shows a schematic view of a preferred embodiment of the hybrid coating, that is water-repellent and with humidity-barrier properties, laid on a preferred embodiment of a panel made of reinforced polymer composite material, according to the present invention
  • FIG. 2 shows a schematic view of a drop of water laid on the hybrid coating schematically shown in Fig. 1.
  • the Figure points out what is meant by "Water Contact Angle” or WCA;
  • FIG. 3 shows a transmittance spectrum that is the result on an analysis performed on a layer of polyurethane paint laid on a preferred embodiment of a panel made of reinforced polymer composite material, after a three-month exposure to an environment with its relative humidity increased from 40 % to 80 % in a few days, and remained at 80 % for the whole affected period ' (three months) ;
  • FIG. 4 shows a transmittance spectrum that is the result on an analysis performed on the hybrid coating schematically shown in Fig. 1, after a three-month exposure to an environment with its relative humidity increased from 40 % to 80 % in a few days, and remained at 80 % for the whole affected period (three months);
  • Figure 5 shows a graph that describes how humidity concentration changes in a preferred embodiment of a panel made of reinforced polymer composite material, depending on the relative humidity of the environment to which said panel is exposed;
  • Figure ⁇ shows a graph that describes how humidity concentration changes depending on time in a preferred embodiment of a panel made of reinforced polymer composite material exposed to an environment whose relative humidity is equal to 80%;
  • FIG. 7 shows a schematic perspective view of a preferred embodiment of a machine tool.
  • the present invention refers to a hybrid coating (1) for reinforced polymer composite materials to be used in mechanical applications where a high dimensional stability is required.
  • Such coating (1) obtained through PECVD, is composed of a humidity-proof thin layer (4) and a still thinner layer (3) with water-repellence characteristics.
  • the substrate to which said coating (1) is applied can be a panel (2) made of a polymer composite material reinforced with aramide, carbon (CFRP) or glass (GFRP) fibres.
  • CFRP aramide, carbon
  • GFRP glass
  • a preferred embodiment of said coating (2) is obtained by using as gas mixture for the plasma treatment, for example, hexamethyldisiloxane (or HDMSO: [ (CH 3 ) 3 Si] 2 0) as monomer, oxygen (O 2 ) and argon (Ar) .
  • Said coating (1) is therefore a silicon-like coating, namely based on silicon, and also containing carbon, oxygen and hydrogen.
  • two layers (3) and (4) are laid, composed of the same chemical elements being present, but in different percentages and with a different stoichiometry.
  • the deeper layer (4) directly adheres to the composite material (2) skin and has steam- barrier properties.
  • the layer (3) more on the surface is laid on the humidity-proof layer (4) and shows water-repellence characteristics .
  • Deposition in the present case occurs by using as process chamber a reactor with capacitive coupling in an asymmetric configuration (namely with electrodes with different sizes) in which biasing/ionisation of gaseous products (and therefore plasma generation) occurs through an electric field at a frequency, for example, of 13.56 MHz.
  • the material to be coated is placed on the electrode with bigger sizes, that is electrically grounded.
  • the first layer (4) of which the hybrid coating (1) is composed is laid at a pressure, for example, ranging between 1 Pa and 10 Pa and using a gas mixture composed of HMDSO as monomer and O 2 .
  • a pressure for example, ranging between 1 Pa and 10 Pa
  • a gas mixture composed of HMDSO as monomer and O 2 .
  • a thin layer (4) is laid with a thickness that changes, according to the deposition time, from a few tens to a few hundreds of nanometres, having a very high density and whose composition is characterised by a low content of carbon and silanol groups (SiOH) (elements that lower the humidity barrier properties), so that its stoichiometry is next to the silica (SiO 2 ) one.
  • SiOH silanol groups
  • a second, very thin layer (3) (for example, with a thickness of a few tents of nanometres) is laid, with a different chemical composition and with water-repellence characteristics.
  • Such layer (3) is laid at a pressure, for example, included between 1 Pa and 10 Pa and using a gas mixture composed of HMDSO as monomer, O 2 and Ar.
  • the water-repellent layer (3) is obtained by operating in a low fragmentation state (and therefore with low power, for example less than 100 W) and with a lower dilution of HMDSO in O 2 (for example: O 2 flow/HMDSO flow ⁇ 10).
  • the thereby obtained layer (3) is less dense with respect to the layer (4) below, but due to its composition (presence of apolar methyl groups (-CH 3 ) ) has water-repellence properties. Moreover, if such layer (3) is extremely thin, its possible humidity absorption is negligible.
  • the optimum speed with which the above film (1) is obtained is 30 ⁇ 50 nm/minute.
  • (1) obtained through the above described deposition process is characterised by optimum steam barrier properties and water-repellence. Should the application require a higher hardness and resistance to abrasion, it is possible to deposit (through direct insertion, pouring or injection moulding), on the layer (4) with barrier property, as an alternative to the water-repellent later (3), a layer of resins/fillers loaded with metal or ceramic powders, having a thickness of some tens of micrometer.
  • the first experimental test consisted in measuring the contact angle with a water drop (5) laid on the surface of a CFRP sample coated through PECVD with previously mentioned process parameters as an example.
  • the term contact angle of a water drop means the angle included between the contact surface (in such case, the coating (1) of the CFRP sample) and a surface that is tangent to the drop and passing by a point (6) in which the contact between drop (5) and contact surface begins.
  • WCA Water Contact Angle
  • Such angle is therefore a quantitative expression of coating (1) water-repellence.
  • Polyurethane paints are traditional coatings used for conferring properties of water-repellence and barrier against humidity absorption. Said paints, being based on resins, however tend to absorb humidity and then diffuse it to the composite layers below.
  • the second experimental test consisted in qualitatively evaluating the barrier properties of the protecting film, through a survey of the presence of -OH groups in a CFRP sample initially not containing -OH groups, after a three- month exposure to an environment with a relative humidity grown from 40 % to 80 % in a few days, and remained at 80 % for the whole affected period (three months) .
  • the CFRP sample has been coated with PECVD adopting the previously mentioned process parameters as an example.
  • the presence of -OH groups testifies the absorption of water molecules by any material. The lower the concentration of -OH groups, the lower the absorption of water molecules and the better the humidity barrier properties of the coating laid on the material.
  • the sample spectrum coated with polyurethane paint has the negative peak (7) that testifies the presence of -OH groups. Such peak instead is absent in the spectrum (shown in Figure 4) that is the result of the analysis performed on the sample coated with PECVD.
  • the above stated results demonstrate how the coating (1) of the present invention is extremely more efficient than polyurethane paints in terms of humidity- barrier .
  • the coating (1) of the present invention has been conceived to be applied to reinforced composite polymer materials to be used as structural elements in mechanical applications that require a high dimensional stability, and a possible field of application of the present invention is the field of operating machines.
  • the length variation AL [m] of a panel size produced by efforts of a mechanical and thermal nature and by humidity absorption can be approximately expressed by the following relationship: « - where: ⁇ is the distortion due to mechanical efforts;
  • Lo [m] is the initial length of the affected characteristic size
  • ⁇ [% ⁇ 1 ] is the swelling coefficient due to humidity absorption
  • AM / Mo [in % units] is the percentage variation of panel humidity concentration due to the humidity absorption effect, with respect to initial panel humidity concentration; a [K "1 ] is the thermal expansion coefficient;
  • AT [K] is the temperature variation with respect to the initial state.
  • the swelling coefficient ⁇ due to humidity absorption is defined as:
  • the thermal expansion coefficient a is the relative length variation with respect to the initial length, due to the temperature variation with respect to the initial state.
  • Geometric distortions AS produced only by humidity absorption by a structural element can therefore be expressed through the following relationship:
  • beta coefficient has different values, according to considered sizes.
  • ⁇ L is defined as the value assumed by the swelling coefficient along the fibre direction and ⁇ ⁇ the value assumed by the swelling coefficient in a direction perpendicular to the fibres.
  • the percentage variation of humidity concentration in the panel made of composite passes (due to a diffusive effect) from a value of about 0.8% to about 1.4% (equilibrium value) as can be deduced by the experimental graph in Figure 5.
  • Humidity concentration in the panel matrix grows with time according to the Fick law.
  • the relationship between humidity concentration in the panel matrix under the above stated conditions and time is shown by the experimental graph in Figure 6.
  • the humidity concentration in the panel matrix goes from about 0.8 % to the equilibrium value (about 1.4 %) within 50 days (1200 hours) .

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

L'invention concerne un revêtement hybride pour matériaux polymères composites renforcés devant être utilisés pour des applications mécaniques structurales qui requièrent une stabilité géométrique élevée. Les matériaux composites présentent des propriétés de légèreté et de rigidité, mais sont soumises à des distorsions géométriques dues à l'absorption d'humidité présente dans l'atmosphère ou suite à un contact accidentel avec des liquides dans l'environnement de travail dans lequel le composite lui-même est utilisé. L'objectif de ce revêtement est d'attribuer à un matériau composite des propriétés qui améliorent sa stabilité dimensionnelle et qui évitent par conséquent une altération des dimensions des structures composées du matériau touché. On obtient un tel revêtement au moyen d'un procédé de dépôt chimique en phase vapeur activé par plasma (PECVD). Des modes de réalisation préférés d'un tel revêtement sont réalisés en utilisant, en tant que précurseurs, des monomères organosilanes (par exemple, hexaméthyldisiloxane ou HDMSO) combinés avec de l'oxygène (O2) et, éventuellement, de l'argon (Ar).Le revêtement est constitué de deux couches. La couche la plus interne est résistante à l'humidité, et agit par conséquent en tant que barrière protectrice pour le matériau composite sur lequel elle est appliquée. La couche la plus en surface présente des caractéristiques hydrophobes et est constituée des même éléments chimiques qui sont présents dans la couche la plus interne, mais dans des pourcentages différents et avec une stoichiométrie différente. Parmi les matériaux composites sur lesquels il est possible d'appliquer ce revêtement, figurent, par exemple, des matériaux renforcés avec de l'aramide (par exemple, du Kevlar), du carbone (CFRP) ou des fibres de verre (GFRP). Parmi les applications structurales desdits matériaux composites qui nécessitent une stabilité géométrique élevée, figure, par exemple, le domaine des machines fonctionnelles.
PCT/IT2007/000604 2006-12-22 2007-09-03 Revêtement hybride qui est hydrophobe et résistant à l'humidité pour matériaux polymères composites renforcés déposés par pecvd WO2008078346A1 (fr)

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EP07827658A EP2094798A1 (fr) 2006-12-22 2007-09-03 Revêtement hybride qui est hydrophobe et résistant à l'humidité pour matériaux polymères composites renforcés déposés par pecvd

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ITMI2006A002482 2006-12-22
IT002482A ITMI20062482A1 (it) 2006-12-22 2006-12-22 Rivestimento ibrido idrorepellente e impermeabile all'umidita' per materiali compositi polimerici rinforzati deposto mediante pecvd

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Cited By (13)

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DE102010055155A1 (de) * 2010-12-15 2012-06-21 Khs Corpoplast Gmbh Verfahren zur Plasmabehandlung von Werkstücken sowie Werkstück mit Gasbarriereschicht
US8286561B2 (en) 2008-06-27 2012-10-16 Ssw Holding Company, Inc. Spill containing refrigerator shelf assembly
CN103348502A (zh) * 2011-02-08 2013-10-09 应用材料公司 有机发光二极管的混合式封装方法
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US8286561B2 (en) 2008-06-27 2012-10-16 Ssw Holding Company, Inc. Spill containing refrigerator shelf assembly
US10130176B2 (en) 2008-06-27 2018-11-20 Ssw Holding Company, Llc Spill containing refrigerator shelf assembly
US8596205B2 (en) 2008-06-27 2013-12-03 Ssw Holding Company, Inc. Spill containing refrigerator shelf assembly
US10827837B2 (en) 2008-06-27 2020-11-10 Ssw Holding Company, Llc Spill containing refrigerator shelf assembly
US9532649B2 (en) 2008-06-27 2017-01-03 Ssw Holding Company, Inc. Spill containing refrigerator shelf assembly
US11191358B2 (en) 2008-06-27 2021-12-07 Ssw Advanced Technologies, Llc Spill containing refrigerator shelf assembly
US11786036B2 (en) 2008-06-27 2023-10-17 Ssw Advanced Technologies, Llc Spill containing refrigerator shelf assembly
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US9279073B2 (en) 2008-10-07 2016-03-08 Ross Technology Corporation Methods of making highly durable superhydrophobic, oleophobic and anti-icing coatings
US9096786B2 (en) 2008-10-07 2015-08-04 Ross Technology Corporation Spill resistant surfaces having hydrophobic and oleophobic borders
US9067821B2 (en) 2008-10-07 2015-06-30 Ross Technology Corporation Highly durable superhydrophobic, oleophobic and anti-icing coatings and methods and compositions for their preparation
US9926478B2 (en) 2008-10-07 2018-03-27 Ross Technology Corporation Highly durable superhydrophobic, oleophobic and anti-icing coatings and methods and compositions for their preparation
US9074778B2 (en) 2009-11-04 2015-07-07 Ssw Holding Company, Inc. Cooking appliance surfaces having spill containment pattern
US9914849B2 (en) 2010-03-15 2018-03-13 Ross Technology Corporation Plunger and methods of producing hydrophobic surfaces
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CN103348502A (zh) * 2011-02-08 2013-10-09 应用材料公司 有机发光二极管的混合式封装方法
US9546299B2 (en) 2011-02-21 2017-01-17 Ross Technology Corporation Superhydrophobic and oleophobic coatings with low VOC binder systems
US10240049B2 (en) 2011-02-21 2019-03-26 Ross Technology Corporation Superhydrophobic and oleophobic coatings with low VOC binder systems
US10317129B2 (en) 2011-10-28 2019-06-11 Schott Ag Refrigerator shelf with overflow protection system including hydrophobic layer
US9139744B2 (en) 2011-12-15 2015-09-22 Ross Technology Corporation Composition and coating for hydrophobic performance
US9528022B2 (en) 2011-12-15 2016-12-27 Ross Technology Corporation Composition and coating for hydrophobic performance
US9388325B2 (en) 2012-06-25 2016-07-12 Ross Technology Corporation Elastomeric coatings having hydrophobic and/or oleophobic properties
US9741966B2 (en) 2012-09-04 2017-08-22 Applied Materials, Inc. Method for hybrid encapsulation of an organic light emitting diode
US9397318B2 (en) 2012-09-04 2016-07-19 Applied Materials, Inc. Method for hybrid encapsulation of an organic light emitting diode
US11786930B2 (en) 2016-12-13 2023-10-17 Hzo, Inc. Protective coating

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