WO2010125686A1 - リン酸カルシウム複合体及びその製造方法 - Google Patents
リン酸カルシウム複合体及びその製造方法 Download PDFInfo
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- WO2010125686A1 WO2010125686A1 PCT/JP2009/058529 JP2009058529W WO2010125686A1 WO 2010125686 A1 WO2010125686 A1 WO 2010125686A1 JP 2009058529 W JP2009058529 W JP 2009058529W WO 2010125686 A1 WO2010125686 A1 WO 2010125686A1
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/04—Pretreatment of the material to be coated
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
- C23C18/122—Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1229—Composition of the substrate
- C23C18/1241—Metallic substrates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
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- 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
- C08K3/32—Phosphorus-containing compounds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Definitions
- the present invention relates to a calcium phosphate complex and a method for producing the same, and more particularly to a calcium phosphate complex in which calcium phosphate is immobilized on a metal surface and a method for producing the same.
- Calcium phosphate such as hydroxyapatite is widely used in the medical field as a biocompatible material.
- a composite material in which the surface of a base material is coated with calcium phosphate has high cell adhesion, application as a transdermal device such as a catheter is expected.
- a technique has been proposed in which calcium phosphate particles are bonded to the surface of a flexible polymer substrate such as cyclofibroin and used in a transdermal device.
- a technique for fixing hydroxyapatite to the substrate surface for example, a polymer substrate having a specific functional group such as an isocyanate group or an alkoxysilyl group is selected as the polymer substrate, and the polymer group is selected.
- a method of bonding hydroxyapatite to a material has been proposed (Patent Document 1).
- a method for forming hydroxyapatite on the polymer surface Patent Document 2.
- Non-patent Document 1 A method of fixing hydroxyapatite on a metal surface by reaction of a residue and hydroxyapatite has been disclosed (Non-patent Document 1).
- a first object of the present invention is to provide a means for fixing calcium phosphate on a metal surface by a processing method with little residue without using an acid.
- the present invention has a second object to provide means for fixing calcium phosphate on a metal surface by a treatment method that does not use a thiol compound.
- the present invention (1) is a method for producing a calcium phosphate complex formed by binding calcium phosphate to the surface of a substrate, A surface treatment step of bringing the surface treatment agent into contact with the surface of the substrate and then bringing the silane coupling agent into contact with the surface treatment step; After the surface treatment step, a polymerization step for starting polymerization of the silane coupling agent with a polymerization initiator, A bonding step of bonding the calcium phosphate to the silane coupling agent on the surface of the base material after the polymerization step,
- the substrate is a metal;
- the surface treatment agent is ozone water.
- the present invention (2) is the production method of the invention (1), wherein the silane coupling agent is a non-thiol silane coupling agent.
- This invention (3) is a manufacturing method as described in said invention (1) or (2) characterized by using stainless steel as said base material.
- the present invention (4) is a calcium phosphate complex obtained by any one of the above inventions (1) to (3).
- Calcium phosphate complex means a structure in which calcium phosphate is bonded to the surface of a substrate.
- Ozone water means water in which ozone is dissolved.
- Surface treatment means a treatment for modifying the surface of a substrate.
- ozone is used in place of acid when introducing the silane coupling agent to the metal surface.
- calcium phosphate can be fixed to the metal surface without remaining.
- ozone water by treating the metal surface with ozone water, a large amount of OH groups are introduced onto the surface of the base material and wettability is improved, so that the silane coupling agent is remarkably compared with the case of treating with ozone gas. Since it becomes easy to introduce, there is also an effect that calcium phosphate can be fixed on the metal surface with strong adhesive strength and high coverage.
- the organic substance on the surface of the base material can be removed by the ozone water treatment, there is an effect that the silane coupling agent can be easily introduced.
- the use of stainless steel as the base material has the effect that the introduction of the silane coupling agent onto the metal surface by ozone water treatment is particularly easy.
- FIG.1 (a) is a figure which shows the result of having measured the base-material surface before ozone water treatment by XPS
- FIG.1 (b) is the result of having measured the base-material surface after ozone water treatment by XPS.
- FIG. 2A is a 10,000 times SEM photograph of the composite surface of Example 1
- FIG. 2B is a 2,000 times SEM photograph of the composite surface of Example 1.
- FIG. FIG. 3 is a diagram showing the results of IR measurement of the substrate surface after each step
- FIG. 3 (a) is an untreated substrate
- FIG. 3 (b) is a substrate after graft polymerization
- FIG. 3 (c) is a diagram showing the results of measuring the substrate after HAp coating.
- FIG. 4A is a SEM photograph of 5,000 times the surface of the composite of Example 2
- FIG. 4B is a SEM photograph of 2,000 times the surface of the composite of Example 2.
- FIG. 5 is an SEM photograph of 5,000 times the surface of the base material of Comparative Example 1.
- FIG. 6 is an SEM photograph of 5,000 times the surface of the base material of Comparative Example 2.
- FIG. 7 is an SEM photograph of 5,000 times the surface of the base material of Comparative Example 3.
- the calcium phosphate complex in the calcium phosphate complex according to the best mode, calcium phosphate is bonded to the surface of the substrate via a silane coupling agent.
- the calcium phosphate complex includes a surface treatment step in which a surface treatment agent is brought into contact with the surface of the substrate, and then a surface treatment step is carried out by bringing a silane coupling agent into contact with the surface.
- a pretreatment step for washing the substrate surface a homopolymer removal step for removing the homopolymer generated in the polymerization step, a washing step for washing the substrate surface after the bonding step, etc. You may have.
- a homopolymer removal step for removing the homopolymer generated in the polymerization step a washing step for washing the substrate surface after the bonding step, etc.
- the substrate used in the present invention is a metal.
- the metal include titanium, titanium oxide, titanium alloy, and stainless steel.
- stainless steel is particularly preferred.
- austenitic stainless steel containing molybdenum (Mo) is preferable, and more specifically, SUS316 and SUS317 are preferable.
- the shape of the substrate used in the present invention is not particularly limited, and various shapes of substrates can be appropriately selected according to the application of the calcium phosphate complex.
- the shape of the substrate may be a fiber shape, a sheet shape, a tube shape, a porous body, or a more complicated shape. Thus, it is not restricted by the shape of a base material, Even if it uses the base material of a complicated shape, a HAp composite_body
- the production method according to the present invention can easily bond a base material and calcium phosphate to a base material having various shapes with strong adhesive strength and high coverage.
- the silane coupling agent that can be used in this best mode has a chemical structure as shown in chemical formula (1).
- ZX-SiR 3 (1) Said Z should just have a reactive functional group, and specifically, a vinyl group, an epoxy group, an amino group, a (meth) acryloxy group, a mercapto group etc. are mentioned, for example.
- the R may be any one that can undergo a condensation reaction with an inorganic material (hydroxyapatite sintered body). Specifically, for example, an alkoxy group having 1 to 4 carbon atoms such as a methoxy group or an ethoxy group. And a hydroxyl group and a chlorine atom.
- X in the chemical formula (1) may be bonded by a polymer chain, may be bonded by a low molecular chain (for example, an alkylene chain having 1 to 12 carbon atoms), or is directly bonded. May be.
- the alkoxy group has a carbon number within the above-mentioned range, the alcohol produced by the condensation reaction with hydroxyapatite described later has sufficient solubility in water, so the surface is washed with water. It is preferable because the alcohol can be removed only with this.
- examples of the silane coupling agent include vinyl silane coupling agents such as vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltrihydroxysilane; ⁇ - (3,4 Epoxy cyclohexyl) epoxy trisilane coupling agents such as ethyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropylmethyldiethoxysilane, ⁇ -glycidoxypropyltriethoxysilane; p-styryl Styryl silane coupling agents such as trimethoxysilane; ⁇ -methacryloxypropylmethyldimethoxysilane, ⁇ -methacryloxypropyltrimethoxysilane, ⁇ -methacryloxypropylmethyldiethoxysilane, ⁇ -methacryloxypropylto Methacryloxy-based silane coupling agents such as ree
- silane coupling agents having a polymerizable double bond such as vinyl silane coupling agents, styryl silane coupling agents, methacryloxy silane coupling agents, acryloxy silane coupling agents, and the like. Is preferred.
- silane coupling agents exemplified above ⁇ -methacryloxypropyltrimethoxysilane and ⁇ -methacryloxypropyltriethoxysilane are more preferable because they are polymerizable monomers.
- the silane coupling agent used in the surface treatment step described later and the silane coupling agent used in the polymerization step may be the same or different.
- a thiol-based silane coupling agent having a mercapto group is used, there is a high possibility that a problem of odor will occur due to the silane coupling agent remaining, so a non-thiol-based silane coupling agent having no mercapto group. Is preferably used.
- the calcium phosphate used in the production method according to the present invention is not particularly limited, but is preferably hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ), more preferably a hydroxyapatite sintered body (also called hydroxyapatite ceramics). preferable.
- Hydroxyapatite particularly a hydroxyapatite sintered body, is stable as a raw material for a calcium phosphate composite used for medical use because it exists stably in a living body for a long period of time and has high safety. Hydroxyapatite is particularly excellent as a material for transdermal devices because of its high adhesion to cells such as skin.
- the surface treatment step included in the production method according to the present invention is a step of surface-treating a base material, wherein the surface of the base material is contacted with ozone water and then contacted with a silane coupling agent. That's fine.
- the pretreatment step may be performed according to the situation such as when the surface of the base material is contaminated. Specifically, ultrasonic cleaning may be performed by immersing the base material in a solvent such as water or alcohol. By this process, organic substances on the surface of the substrate are removed, and in the surface treatment process performed after the process, ozone treatment can be efficiently performed.
- the present inventors have found that the calcium phosphate and the base material can be very easily combined with each other by an ozone water treatment step in which the base material is surface-treated with ozone water.
- the surface of the base material can be easily and uniformly infused with ozone water simply by infiltrating the base material with ozone water or by spraying the base material with ozone water. Can be contacted. Therefore, the operation can be performed easily and efficiently.
- the present inventors have also found that calcium phosphate and a substrate can be bonded with a strong adhesive strength and a high coverage by performing a surface treatment using ozone water.
- a substrate coated with calcium phosphate is subjected to ultrasonic cleaning, the calcium phosphate may be peeled off. This is due to the weak adhesive strength between the calcium phosphate and the substrate.
- calcium phosphate was bonded to a substrate surface-treated with ozone water, it was possible to prevent the calcium phosphate from peeling off when ultrasonically cleaned.
- the calcium phosphate complex is used for medical purposes, it is preferable that the coverage of the substrate surface with calcium phosphate is about 60%.
- a coverage with 60% or more calcium phosphate can be achieved even on a metal surface.
- the coverage is a value calculated by processing an image taken with a scanning electron microscope with two-step color tone and comparing the area of the particle portion with the area of the substrate surface.
- the ozone water used in the surface treatment step is not limited as long as it is water in which ozone is dissolved, and can be manufactured using a conventionally known method and apparatus. For example, you may manufacture by the method of aeration of ozone in water.
- a conventionally known stirrer, bubble cylinder, pressure injector, Benchery injector, static mixer, or the like may be used as a device for dissolving ozone in water.
- a conventionally known stirrer, bubble cylinder, pressure injector, Benchery injector, static mixer, or the like may be used as a method for producing ozone water.
- the method for bringing the surface of the base material into contact with ozone water is not particularly limited, but for example, the base material may be immersed in ozone water. Moreover, you may stir the said ozone water during immersion.
- the concentration of ozone in the ozone water used in the production method according to the present invention is not particularly limited, but is preferably 1 to 50 ppm, and more preferably 10 to 35 ppm. By setting the concentration of ozone water to 1 to 50 ppm, calcium phosphate can be bonded to the surface of the substrate with extremely strong adhesive strength and high coverage. Further, when the content is 10 to 35 ppm, calcium phosphate can be bonded to the surface of the substrate with stronger adhesive strength and coverage.
- the temperature of the ozone water is not particularly limited, but is preferably 20 to 60 ° C, more preferably 20 to 40 ° C, and still more preferably room temperature (for example, 25 ° C). Within this range, calcium phosphate can be bonded to the surface of the substrate with extremely strong adhesive strength and high coverage.
- the time for contacting the surface of the substrate with the ozone water is not particularly limited, but is preferably 1 to 120 minutes, more preferably 5 to 30 minutes, and further preferably 5 to 20 minutes. If it is the said range, a calcium phosphate can be combined with the surface of a base material with very strong adhesive strength and high coverage.
- the substrate after ozone treatment is immersed in an organic solvent.
- the treatment temperature is not particularly limited, but for example, 10 to 50 ° C. is preferable, and 15 to 35 ° C. is more preferable.
- the treatment time is not particularly limited, but for example, 10 seconds to 5 minutes is preferable, and 20 seconds to 1 minute is more preferable.
- the solvent used here is not particularly limited as long as it is a water-soluble organic solvent, and examples thereof include tetrahydrofuran (THF), methanol, ethanol, acetone, acetonitrile, dimethyl sulfoxide (DMSO) and the like.
- the silane coupling agent contact step of bringing the silane coupling agent into contact with the substrate surface the above-described silane coupling agent is used.
- the method of making a silane coupling agent contact is not specifically limited, For example, a base material is immersed in the solution which melt
- the temperature of the solution is not particularly limited, but is preferably 30 to 100 ° C., more preferably 40 to 80 ° C.
- nonpolar organic solvents such as hydrocarbon solvents, such as toluene and hexane
- the amount of the silane coupling agent used is not particularly limited, but is preferably 10 to 500% by weight, more preferably 50 to 400% by weight, based on the weight of the base material. More preferred is 100 to 300% by weight.
- the contact time for silane coupling is not particularly limited, but is preferably 5 to 120 minutes, and more preferably 10 to 60 minutes.
- the polymerization step included in the production method according to the present invention may be a step in which the polymerization of the silane coupling agent is started by the polymerization initiator.
- the addition of the polymerization initiator causes the remaining silane coupling agent not bonded to the substrate surface in the previous surface treatment step to be polymerized and the silane coupling agent bonded on the substrate surface to be polymerized.
- the graft polymer which has an alkoxy silyl group is formed in the base-material surface, the said alkoxy silyl group and calcium phosphate form a coupling
- silane coupling agent not only the remaining silane coupling agent not bonded to the substrate surface in the surface treatment step, but also a silane coupling agent may be added.
- the silane coupling agent to be added may be the same material as that used in the surface treatment step, or may be another material.
- a compound having a polymerizable double bond and an isocyanate group may be added instead of the silane coupling agent.
- the polymerization initiator used in this step depends on the type of silane coupling agent to be used, but various known azo- and peroxide-based silane coupling agents have a polymerizable double bond.
- a polymerization initiator can be used, and examples thereof include an azo polymerization initiator represented by azobisisobutyronitrile (AIBN) and a peroxide polymerization initiator represented by benzoyl peroxide (BPO). It is done.
- the temperature of the solution is not particularly limited, but is preferably 30 to 100 ° C., more preferably 40 to 80 ° C.
- a solvent for example, nonpolar organic solvents, such as hydrocarbon solvents, such as toluene and hexane, are used suitably.
- the amount of the silane coupling agent used is not particularly limited, but is preferably 10 to 500% by weight, more preferably 50 to 400% by weight, based on the weight of the base material. More preferred is 100 to 300% by weight.
- the amount of the surfactant is preferably 1.0 to 50% by weight, more preferably 10 to 25% by weight, based on the silane coupling agent.
- a homopolymer removing step of removing a homopolymer generated in the polymerization step of the silane coupling agent adhering to the substrate surface may be included.
- ultrasonic cleaning may be performed by immersing the base material in a solvent such as water or alcohol. This step is efficient because the homopolymer on the substrate surface is removed and the bonding step performed after the step allows the alkoxysilyl group of the graft polymer bonded to the substrate to react with calcium phosphate.
- the binding step included in the production method according to the present invention may be a step for binding the calcium phosphate to the surface of the base material after the surface treatment step.
- the method for binding calcium phosphate to the surface of the substrate after the polymerization step is not particularly limited, and a conventionally known method may be used.
- Patent Documents 1 and 2 can be referred to.
- the substrate may be immersed in a liquid in which calcium phosphate is suspended. Further, the liquid may be stirred during the immersion, or may be subjected to ultrasonic treatment.
- the substrate after immersion, the substrate may be allowed to stand under reduced pressure conditions, preferably under vacuum conditions, or may be further heated under reduced pressure conditions or vacuum conditions.
- the heating temperature is preferably 50 to 200 ° C, more preferably 80 to 150 ° C.
- a washing step of washing the calcium phosphate complex obtained by the binding step may be performed.
- the washing step may be performed according to the intended use of the calcium phosphate complex. What is necessary is just to select suitably according to the grade of the target washing
- ultrasonic cleaning may be performed. Since the calcium phosphate composite obtained by the production method according to the present invention has an extremely strong adhesive strength between the substrate and calcium phosphate, peeling of calcium phosphate can be satisfactorily suppressed even when ultrasonic cleaning is performed.
- the ultrasonic cleaning may be performed by a conventionally known method.
- the method for producing a calcium phosphate complex described above can be used for various purposes. For example, it is beneficial to apply to the manufacture of medical devices such as stents.
- FIG. 1A shows the result of analyzing the surface of untreated SUS316L by XPS. According to these results, it can be seen that a large number of OH groups are introduced on the surface of SUS316L because an increase in the peak of M—OH bond was observed.
- a SUS316L substrate having a size of 10 mm ⁇ 10 mm ⁇ thickness 1 mm was subjected to ultrasonic cleaning (50 W) in an ethanol solvent for 2 minutes. Thereafter, the substrate was immersed in room temperature ozone water having a predetermined concentration (ppm) for a predetermined time (min). Ozone water was produced by the same method as described above. After immersion, the substrate was dried, a water droplet was dropped on the surface of the treated substrate, and the contact angle between the substrate and the water droplet was measured. The results under each condition are shown in Table 1 below. The contact angle was calculated from the relationship between the diameter and the amount of dripping, by measuring the diameter of a water droplet that was dropped by dropping 10 ⁇ L of water and allowed to stand for 30 seconds.
- Example 1 [Ozone water treatment] A SUS316L substrate having a size of 10 mm ⁇ 10 mm ⁇ thickness 0.1 mm was subjected to ultrasonic cleaning (50 W) in an ethanol solvent for 2 minutes. Thereafter, the substrate was immersed in 15 ppm room temperature ozone water for 20 minutes. After dipping, the substrate was dipped in THF (tetrahydrofuran) to remove moisture on the surface during ozone water treatment.
- THF tetrahydrofuran
- Silane coupling agent ( ⁇ -methacryloxypropyltriethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd., KBE503, hereinafter simply referred to as “KBE”) was bubbled with nitrogen gas into a solution of 3.3 ml and toluene 25 ml at a temperature of 70 ° C. Then, the base material subjected to the treatment was immersed for 30 minutes. Thereafter, 5 ml of toluene in which 33 mg of AIBN was further dissolved was added, and the substrate was immersed in the solution at a temperature of 70 ° C. for 120 minutes while bubbling with nitrogen gas, and graft polymerization was performed.
- Silane coupling agent ⁇ -methacryloxypropyltriethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd., KBE503, hereinafter simply referred to as “KBE”
- FIG. 1 A scanning electron microscope (SEM) photograph obtained by this treatment is shown in FIG.
- the scanning electron microscope was measured using JSM-5510 manufactured by JEOL.
- FIG. 1 The IR measurement was performed with Spectrum 100 (Fourier transform infrared spectroscopic analyzer) manufactured by PerkinElmer. According to these results, a CBE peak derived from KBE and a Si—O—C peak derived from KBE were observed after graft polymerization ⁇ FIG. 3 (b) ⁇ , so that KBE was introduced to the substrate surface. I was able to confirm.
- the peak of the phosphate ion derived from HAp was observed ⁇ FIG. 3 (c) ⁇ after the HAp coating, it was confirmed that HAp was introduced into the substrate surface.
- Example 2 The surface treatment of the base material was performed under the same conditions as in Example 1 above, except that SUS304 was used as the treatment base material and the ozone water treatment was performed using 40 ppm ozone water for 60 minutes.
- SUS304 was used as the treatment base material
- ozone water treatment was performed using 40 ppm ozone water for 60 minutes.
- SEM photograph which shows the result of a base-material process is shown in FIG.
- Example 1 The substrate was surface treated under the same conditions as in Example 1 except that the graft polymerization treatment was not performed. An SEM photograph of the surface of the substrate is shown in FIG.
- Example 2 The substrate was surface treated under the same conditions as in Example 1 except that the ozone water treatment was not performed. A SEM photograph of the surface of the substrate is shown in FIG.
- Example 3 The substrate was surface-treated under the same conditions as in Example 1 except that the ozone water treatment and the graft polymerization treatment were not performed. A SEM photograph of the surface of the substrate is shown in FIG.
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Abstract
Description
上記基材の表面に表面処理剤を接触させた後に、シランカップリング剤を接触させて表面処理する表面処理工程と、
上記表面処理工程後に、重合開始剤によりシランカップリング剤の重合を開始させる重合工程と、
重合工程後の上記基材の表面のシランカップリング剤に上記リン酸カルシウムを結合させる結合工程と、を含み、
上記基材が金属であり、
上記表面処理剤がオゾン水であることを特徴とする製造方法である。
本発明において使用される基材は金属である。ここで金属としては、チタン、酸化チタン、チタン合金、ステンレス等が挙げられる。これらの中でも特にステンレスが好適である。またステンレスの中でも、モリブデン(Mo)を含むオーステナイト系のステンレスが好適であり、より具体的には、SUS316、SUS317が好適である。これらのステンレスを用いることにより、より穏和な条件下で効率的にオゾン水処理を行うことができ、強い接着強度及び高い被覆率で基材とリン酸カルシウムとを結合させることができる。
本最良形態において使用できるシランカップリング剤は、化学式(1)に示すような化学構造をしている。
Z-X-SiR3 ・・・(1)
上記Zは、反応性官能基を有していればよく、具体的には、例えば、ビニル基、エポキシ基、アミノ基、(メタ)アクリロキシ基、メルカプト基等が挙げられる。また、上記Rは、無機材料(ハイドロキシアパタイト焼結体)と縮合反応することができるものであればよく、具体的には、例えば、メトキシ基、エトキシ基等の炭素数1~4のアルコキシ基や、ヒドロキシル基や、塩素原子等が挙げられる。また、上記化学式(1)中のXは、高分子鎖で結合されていてもよく、低分子鎖(例えば、炭素数1~12のアルキレン鎖)で結合されていてもよく、直接結合されていてもよい。尚、前記アルコキシ基は、先述の範囲内の炭素数であることにより、後述のハイドロキシアパタイトとの縮合反応により生成するアルコールが水に対して十分な溶解性を有するので、水により表面を洗浄するだけで当該アルコールが除去できるため好ましい。
これらのシランカップリング剤の中でも、ビニル系シランカップリング剤、スチリル系シランカップリング剤、メタクリロキシ系シランカップリング剤、アクリロキシ系シランカップリング剤等の重合性二重結合を有するシランカップリング剤が好適である。上記例示のシランカップリング剤のうち、重合性モノマーであるという点で、γ-メタクリロキシプロピルトリメトキシシラン、γ-メタクリロキシプロピルトリエトキシシランがより好ましい。尚、本発明におけるシランカップリング剤は、後述する表面処理工程において使用するものと、重合工程において使用するものが同一であってもよいし、異なる種のものであってもよい。尚、メルカプト基を有するチオール系シランカップリング剤とすると、当該シランカップリング剤が残留することにより、臭気の問題が発生する可能性が高いため、メルカプト基を有しない非チオール系シランカップリング剤を使用することが好ましい。
本発明に係る製造方法で用いるリン酸カルシウムとしては、特に限定されないが、ハイドロキシアパタイト(Ca10(PO4)6(OH)2)が好ましく、ハイドロキシアパタイト焼結体(ハイドロキシアパタイトセラミックスとも呼ばれる)がより好ましい。ハイドロキシアパタイトは、特にハイドロキシアパタイト焼結体は、生体内において長期間安定に存在し、かつ安全性が高いため、医療用に用いるリン酸カルシウム複合体の原料として優れている。また、ハイドロキシアパタイトは皮膚等の細胞との接着性が高いため、経皮デバイスの材料として特に優れている。
本発明に係る製造方法に含まれる表面処理工程は、基材を表面処理する工程であって、上記基材の表面とオゾン水とを接触させた後に、シランカップリング剤を接触させる工程であればよい。尚、表面処理工程前に基材表面を洗浄する前処理工程を行ってもよい。ここで、前処理工程は、基材表面に汚れが生じている場合等の状況に応じて行なえばよい。具体的には、基材を水やアルコール等の溶媒に浸漬して超音波洗浄を行なってもよい。当該工程により、基材表面上の有機物が除去され当該工程後に行われる表面処理工程において、効率的にオゾン処理を行うことが可能となる。
本発明に係る製造方法に含まれる重合工程は、重合開始剤によりシランカップリング剤の重合を開始する工程であればよい。本工程において、前記重合開始剤の添加により、先の表面処理工程において基材表面に結合しなかった残りのシランカップリング剤と、基材表面上に結合したシランカップリング剤が重合し、グラフトポリマーを形成する。これにより、アルコキシシリル基を有するグラフトポリマーが基材表面に形成されるため、後述する結合工程において、当該アルコキシシリル基とリン酸カルシウムが結合を形成する。尚、ここでは、表面処理工程において基材表面に結合しなかった残りのシランカップリング剤のみならず、更に、シランカップリング剤を追加してもよい。また、追加するシランカップリング剤は、表面処理工程において使用するものと同じ物質であってもよいし、別の物質であってもよい。また、シランカップリング剤に代えて、重合性二重結合とイソシアネート基を有する化合物を添加してもよい。これにより、イソシアネート基を有するグラフトポリマーが形成されるため、後述する結合工程において当該イソシアネート基とリン酸カルシウムとの間でウレタン結合を形成することも可能である。
本発明に係る製造方法に含まれる結合工程は、上記表面処理工程後の上記基材の表面に上記リン酸カルシウムを結合させる工程であればよい。重合工程後の基材の表面にリン酸カルシウムを結合させる方法としては、特に限定されず従来公知の方法を用いてもよい。例えば、特許文献1及び2を参照することができる。具体的には、リン酸カルシウムを懸濁させた液体に基材を浸漬させてもよい。また、浸漬の間、当該液体を攪拌してもよいし、超音波処理を行ってもよい。また、浸漬後に、当該基材を減圧条件下、好ましくは真空条件下に静置させてもよく、減圧条件下又は真空条件下において更に加熱してもよい。加熱する温度としては、50~200℃が好適であり、80~150℃がより好適である。
具体的な洗浄方法としては、目的とする洗浄の程度に応じて適宜選択すればよい。例えば超音波洗浄を行なってもよい。本発明に係る製造方法により得られるリン酸カルシウム複合体は、基材とリン酸カルシウムとの接着強度が極めて強いので、超音波洗浄されてもリン酸カルシウムの剥離を良好に抑制できる。超音波洗浄については、従来公知の方法で行なえばよい。
10mm×10mm×厚さ1mmのSUS316L基材に対して、エタノール溶媒中で2分間、超音波洗浄(50W)を施した。その後、基材を15ppmの室温のオゾン水に20分間浸漬した。浸漬後、基材をTHF(テトラヒドロフラン)中に浸漬し、オゾン水処理時の表面の水分を除去した。ここで、使用したオゾン水は、ガス溶解モジュール(ジャパンゴアテック社製、型式:GT-01T)を用いて製造した。具体的には、ガスモジュール内で水道水(流量600ml/min、圧力0.05MPa)とオゾンガス(流量500ml/min、圧力0.03~0.05MPa)とを接触させてオゾン水を製造した。
当該処理後の基材表面をXPSにて酸素のO1sスペクトルの解析を下記の条件で行なった。
機種:サーモフィッシャー製シータプローブ
光源:AlKα
電圧:15kV
電流:6.66mA
スポットサイズ:400μm
(ナロースキャン条件)
パスエナジー:100eV
スキャン回数:5回
ステップ:0.1eV
10mm×10mm×厚さ1mmのSUS316L基材を、エタノール溶媒中で2分間、超音波洗浄(50W)を行なった。その後、基材を所定の濃度(ppm)の室温のオゾン水に所定時間(分)浸漬した。尚、オゾン水は上記と同じ方法により製造した。浸漬後、基材を乾燥し、処理基材の表面に水滴を垂らし、基材と水滴の接触角を測定した。各々の条件における結果を以下の表1に示した。尚、接触角は、10μLの水を滴下し30秒静置させ広がった水滴の直径を計測し、その直径と滴下量との関係より、算出した。
〔オゾン水処理〕
10mm×10mm×厚さ0.1mmのSUS316L基材を、エタノール溶媒中で2分間、超音波洗浄(50W)を行なった。その後、基材を15ppmの室温のオゾン水に20分間浸漬した。浸漬後、基材をTHF(テトラヒドロフラン)中に浸漬し、オゾン水処理時の表面の水分を除去した。
シランカップリング剤(γ-メタクリロキシプロピルトリエトキシシラン、信越化学工業製、KBE503、以下単に「KBE」とする。)3.3mlとトルエン25mlからなる温度70℃の溶液に、窒素ガスにてバブリングしながら、前記処理を施した基材を30分間浸漬した。その後、更にAIBNを33mg溶解したトルエン5mlを追加して、窒素ガスにてバブリングしながら、温度70℃の当該溶液の中で120分間、基材を浸漬し、グラフト重合を行なった。このように時間差でAIBNを添加することで基材表面と結合を有するKBEモノマーと、溶媒中に遊離中のKBEとのグラフトポリマーを形成することを意図している。当該処理後、基材表面上に付着しているKBEのホモポリマーを除去するため、エタノール溶媒中、室温で2分間、超音波洗浄(50W)を実施し、その後、60分間、室温で減圧乾燥した。
上記処理後、1%のハイドロキシアパタイト(HAp)分散液中(分散媒:エタノール)、35℃で20分間、超音波処理(50W)を行った。ここで、ハイドロキシアパタイトは、特許文献1に記載の方法に従って製造したハイドロキシアパタイト焼結体を用いた。その後、減圧下で110℃にて120分間アニーリング(熱処理)を行った。更に当該処理基材をエタノール中、室温で2分間、超音波洗浄(50W)を行なって、基材表面上に物理的に吸着しているHAp粒子を除去した。その後、室温にて60分間減圧乾燥を行なった。当該処理により得られた走査型電子顕微鏡(SEM)写真を図2に示す。尚、走査型電子顕微鏡は、日本電子社製JSM-5510を用いて測定した。また、未処理の基材と、グラフト重合処理後の基材と、HAp被覆後の基材の表面をIRにより測定した結果を図3に示す。尚、IRの測定は、パーキンエルマー製Spectrum 100(フーリエ変換赤外分光分析装置)により行なった。これらの結果によれば、グラフト重合後にKBE由来のC=Oのピークや、KBE由来のSi-O-Cのピークが観測された{図3(b)}ため、基材表面にKBEが導入されたことを確認できた。また、HAp被覆後にはHAp由来のリン酸イオンのピークが観測された{図3(c)}ため、基材表面にHApが導入されたことが確認された。
上記実施例1と、処理基材としてSUS304を用いて、オゾン水処理において、40ppmのオゾン水を用いて、60分間処理したこと以外は同条件で基材の表面処理を行った。基材処理の結果を示すSEM写真を図4に示す。
グラフト重合処理を行わなかったことを除いて、上記実施例1と同条件で基材の表面処理を行った。当該基材の表面のSEM写真を図5に示す。
オゾン水処理を行わなかったことを除いて、上記実施例1と同条件で基材の表面処理を行った。当該基材の表面のSEM写真を図6に示す。
オゾン水処理及びグラフト重合処理を行わなかったことを除いて、上記実施例1と同条件で基材の表面処理を行った。当該基材の表面のSEM写真を図7に示す。
Claims (4)
- 基材の表面にリン酸カルシウムが結合してなるリン酸カルシウム複合体の製造方法であって、
上記基材の表面に表面処理剤を接触させた後に、シランカップリング剤を接触させて表面処理する表面処理工程と、
上記表面処理工程後に、重合開始剤によりシランカップリング剤の重合を開始させる重合工程と、
重合工程後の上記基材の表面のシランカップリング剤に上記リン酸カルシウムを結合させる結合工程と、を含み、
上記基材が金属であり、
上記表面処理剤がオゾン水であることを特徴とする製造方法。 - 前記シランカップリング剤が、非チオール系のシランカップリング剤であることを特徴とする、請求項1に記載の製造方法。
- 上記基材としてステンレスを用いることを特徴とする、請求項1又は2に記載の製造方法。
- 請求項1~3のいずれか一項に記載の方法により得られるリン酸カルシウム複合体。
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- 2009-04-30 KR KR1020117028482A patent/KR101488064B1/ko active IP Right Grant
- 2009-04-30 WO PCT/JP2009/058529 patent/WO2010125686A1/ja active Application Filing
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JPWO2017188285A1 (ja) * | 2016-04-25 | 2019-06-13 | 医療法人Natural Smile | 歯科用補綴物及びその部品 |
JP7141062B2 (ja) | 2016-04-25 | 2022-09-22 | 医療法人Natural Smile | 歯科用補綴物及びその部品 |
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Also Published As
Publication number | Publication date |
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US9447502B2 (en) | 2016-09-20 |
JP5765812B2 (ja) | 2015-08-19 |
KR20120020140A (ko) | 2012-03-07 |
EP2426234A1 (en) | 2012-03-07 |
CN102421940B (zh) | 2015-01-28 |
US20120114832A1 (en) | 2012-05-10 |
EP2426234A4 (en) | 2016-12-28 |
JPWO2010125686A1 (ja) | 2012-10-25 |
KR101488064B1 (ko) | 2015-01-29 |
CN102421940A (zh) | 2012-04-18 |
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