WO2018235218A1 - Composition de résine pour découpe, et article moulé en résine pour découpe ainsi que procédé de fabrication de celui-ci - Google Patents

Composition de résine pour découpe, et article moulé en résine pour découpe ainsi que procédé de fabrication de celui-ci Download PDF

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WO2018235218A1
WO2018235218A1 PCT/JP2017/022967 JP2017022967W WO2018235218A1 WO 2018235218 A1 WO2018235218 A1 WO 2018235218A1 JP 2017022967 W JP2017022967 W JP 2017022967W WO 2018235218 A1 WO2018235218 A1 WO 2018235218A1
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cutting
resin
temperature
residual stress
resin composition
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PCT/JP2017/022967
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English (en)
Japanese (ja)
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西田耕治
加藤由可子
柳下勇
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ポリマーアソシエイツ合同会社
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Priority to JP2018512344A priority Critical patent/JP6427717B1/ja
Priority to PCT/JP2017/022967 priority patent/WO2018235218A1/fr
Publication of WO2018235218A1 publication Critical patent/WO2018235218A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/08—Artificial teeth; Making same
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/70—Tooth crowns; Making thereof
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • 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
    • 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
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds

Definitions

  • a resin composition and a resin molded body suitable for obtaining a model for checking an actual bite from a resin block by designing an intraoral dental treatment product or treatment product such as denture, crown, implant, and maintenance device It is a material and manufacturing method which are excellent in shortening of cutting time, and the appearance of a thing to be cut.
  • CAD treatment tooth design
  • resin block a resin model for occlusal confirmation is manufactured. Also in the production of this resin model, it is possible to cut in a short time, to have a smooth cut surface, and to be free from cracks, chipping and deformation.
  • the first problem is as follows.
  • the step of cutting the object to be cut with a milling bar is a step of shearing and deforming the object to be cut. For this reason, when the shear stress is high, cutting becomes difficult. If the shear stress is too low, as a result of the milling bar biting deeply into the object to be cut, it becomes a "mushy type" cutting and the cutting surface roughness becomes rough. At the same time, there is heat generation due to the friction between the milling bar and the object to be cut and chips, and if there is melting or deformation of the surface of the object to be cut due to this heat generation, the cutting conditions (rotation speed, feed rate) become longer cutting times. It must be changed to Therefore, cooling with cold air, water, and cutting oil is performed.
  • the second problem is as follows. Although not limited to plastic products, methods of measuring residual deformation of molded metal products include the method of perforation. The residual stress is measured by the deformation and dimensional change after the hole is opened. This means that cutting from a dental plastic product according to the invention with a milling bar has to be concerned about affecting dimensional accuracy as a result of residual stresses being released. Low residual stress is preferable, but if the direction of residual stress is aligned in a certain direction, there are relatively few problems. However, it has been demonstrated in the comparative example of the present invention that the variation in cutting roughness increases when the direction of residual stress crosses in the product.
  • Acrylic resin which has been widely used as a conventional dental material, is prepared by adding liquid methyl methacrylate monomer, which is a raw material, to powder or pellets of ultrahigh molecular weight polymethyl methacrylate, stirring and swelling to form a so-called "syrup”. Then cast, heat and polymerize.
  • peroxide is added as a radical generator, but in commercial dental products, since peroxide is often already added, polymethyl methacrylate is obtained in the mold by heating as it is. Be In this process, residual stress is very low and isotropic since residual stress occurs but only volume contraction upon solidification. This is a hidden factor that has been commercialized for many years.
  • thermosetting resin As a material to be polymerized in the mold, there is a thermosetting resin. It is a suitable material for manufacturing extremely small parts such as thick gears and optical connectors as industrial parts with high dimensional accuracy and without generating voids inside. Perhaps you need a cumbersome process to recycle.
  • thermoplastic resin has already been polymerized to a high molecular weight, and the product can be obtained through the process of heating, melting, casting and cooling.
  • the viscosity of the melt is very high and it is a non-Newtonian fluid. Therefore, for example, in injection molding, the viscosity change due to the flow rate of the molten resin from the gate, and the flow shear rate at the surface of the mold become zero. This causes shear deformation distortion of the semi-solidified resin near the mold surface and the molten resin that flows later, and even if the flow reaches the end of the mold, it generates a flow interface by reverse flow. Furthermore, complicated fluid ends may be weld-welded.
  • the complicated flow pattern and the associated stress are solidified as residual compressive stress or tensile stress to form a product.
  • the roughness of the cutting roughness is large when a portion having a high rate of stress change is cut at a portion where tension and compression are in conflict.
  • the molten resin solidifies quickly on the surface of the cooled mold, the solidified resin in the vicinity of the surface of the mold becomes a kind of heat insulating layer and the cooling is delayed. Therefore, when the core layer is solidified after the dimensions are fixed on the product surface, the volume difference between the molten resin and the solid becomes void. In particular, with thick-walled products, this is an unavoidable problem.
  • the extrusion molding method of thermoplastic resin has a very low molding speed. This is to avoid residual stress and strain derived from molecular orientation due to the extrusion direction of the resin as much as possible, and depending on the size of the product, it is extruded from the die at a speed of about 0.1 to 1 m / hour. ing.
  • the difference between the melt volume and the volume at the time of solidification reduces the shrinkage difference by molding at a low temperature as much as possible.
  • the profiled extruded product is subjected to an annealing treatment for 1 to 2 weeks after molding to release the residual stress.
  • the annealing process is related to the crystallinity and extrusion rate of the resin, and the extruded product is placed in an oven heated to a temperature higher than the glass transition temperature, and gradually cooled for about 1 week to 2 while gradually cooling the temperature. Weekly heat treatment is usually done.
  • the cost of profile extrusion is very high.
  • the profiled extruded product is basically in the form of a cylinder, a square pole or a flat plate.
  • the basic shape is cut out from the size of the final product plus the cutting machine mounting portion margin.
  • the cut block is cut from the shape of a cylinder, a square pole or a flat plate into a final shape.
  • an unnecessary portion is cut in the final shape.
  • cutting is performed despite the large amount of cutting of the depression portion. This means that the total cutting time becomes longer.
  • Injection molding can mold any shape, and in such a case, cutting time can be shortened if it is possible to use a die with a die-like depression.
  • the shaping by the melt pressing method can also be shaped by devising the mold, and it is possible to suppress the residual stress more than the injection molding.
  • the molten resin also generates orientation due to flow even during pressing. Further, depending on the position of the cooling pipe, there is a difference in solidification rate similar to that of injection molding, and tensile residual stress resulting therefrom is generated. Therefore, residual stress is only because resin pressure is lower than injection molding. Can not be reduced.
  • Patent Document 1 describes improvement in drill winding of a cellulose powder-filled thermoplastic resin for printed wiring board backup board, but does not mention cutting speed, appearance and the like.
  • Non-patent documents 1 to 6 widely introduce cutting conditions and resin to be cut, and do not refer at all to the material characteristics of the object to be cut and the residual stress ratio.
  • the present invention provides a resin composition for cutting having a shortened cutting time and an excellent appearance of a material to be cut, a resin molding for cutting containing the resin composition for cutting, and a method for producing them.
  • the resin composition for cutting according to one aspect of the present invention is a resin composition having a total composition of 100% by weight having 40 to 97% by weight of a resin and 60 to 3% by weight of an inorganic filler,
  • the machinability parameter calculated from the heat distortion temperature and the tensile modulus is 100 or less.
  • the resin molding for cutting according to one aspect of the present invention contains the resin composition for cutting.
  • the average value of the relative ratio of residual stress defined by the following equation is 0.5 or less, Average value of residual stress relative ratio (Fn) ⁇
  • the average value of the relative residual stress ratio is a relative relative average of residual stress when the inside of the cutting surface is equally divided into 20 equal parts.
  • the resin composition for cutting in the mold heated to a temperature selected from a temperature range of +10 to + 80 ° C. or a temperature range from the crystallization temperature to the melting point with respect to the glass transition temperature,
  • the resin composition for cutting is shaped.
  • the resin molding for cutting may be used as a dental and orthopedic material.
  • the appearance with improved cutting surface roughness and the shortening of the cutting time can be achieved because the feed rate of the milling bar can be increased. It is very useful for the medical industry, for example, it is possible to provide a technical product to a dental clinic and provide it at a reasonable price.
  • the present invention has significant meaning applicable to general resin cutting as well as the dental use exemplified above.
  • the figure which shows the residual stress pattern which concerns on the Example of this invention The figure which shows the residual stress pattern which concerns on the Example of this invention.
  • the resin composition for cutting of the present invention is the following embodiments and Of course, the present invention is not limited to the embodiments, and various modifications can be made without departing from the scope of the present invention.
  • the resin of the present invention refers to a thermoplastic resin and a thermosetting resin.
  • materials for intraoral treatment are limited to materials approved by the Ministry of Health, Labor and Welfare. Since the resin model for checking the bite is out of the scope of the Pharmaceutical Affairs Law, it is possible to select and optimize from the cutting speed and the surface roughness of cutting regardless of thermoplasticity or thermosetting property. Good cutting surface roughness and shortening of cutting time are very important regardless of the intraoral treatment application and the resin model.
  • the resin composition and the resin molding suitable for cutting of the present invention are a resin composition having a total composition of 100% by weight having 40 to 97% by weight of a resin and 60 to 3% by weight of an inorganic filler.
  • the cuttability parameter (HDT / tensile modulus) calculated from the heat distortion temperature (HDT load 1.86 MPa) and the tensile modulus is 100 or less (K temperature / GPa).
  • the basic research of cutting and resin molecular structure in the present invention reveals the following.
  • concentration of the inorganic filler exceeds 60% by weight, the material becomes brittle.
  • concentration of the inorganic filler is less than 3% by weight, particularly in the case of a resin having a main dispersion ( ⁇ dispersion) or subdispersion ( ⁇ , ⁇ dispersion) below room temperature in the temperature dependence of the solid viscoelasticity. Since resin molecules convert external deformation into heat at the time of shearing by a milling bar, cutting is likely to be a "mushy type" and unfavorably because the cutting surface roughness is increased.
  • the inorganic filler has the role of constraining the movement of the molecule and also the function of removing shear heat generated at the tip of the milling bar as cutting powder, so the blending of inorganic filler for heat removal Is required.
  • the proportion of the inorganic filler is preferably 10 to 40% by weight, more preferably 20 to 30% by weight.
  • the cutting surface is likely to be a "mushy type" and has a rough appearance.
  • the machinability parameter is less than 25, even if the milling bar tip is usually diamond particles or CBN, it is not preferable because the life of the milling bar becomes short. If the thermal deformation temperature of the object to be cut is high, the number of rotations of the milling bar and the feed rate can be increased to shorten the cutting time.
  • the inorganic filler filled system plays an important role in providing a heat removal effect when scattering as chips and providing smoothness.
  • the inorganic fillers include inorganic fillers such as amorphous, needle-like, spherical and plate-like.
  • inorganic filler calcium carbonate, silica, kaolin, clay, titanium oxide, barium sulfate, zinc oxide, aluminum hydroxide, alumina, talc, mica, wollastonite, potassium titanate, zinc oxide, sepiolite, zonolite, apatite, Hydroxyapatite etc. are illustrated.
  • the cutting surface becomes hot due to the friction between the cutting bar and the object to be cut and the friction between the chips and the cutting bar.
  • the chips serve to remove heat.
  • the amount of the inorganic filler is determined in relation to the heat distortion temperature of the material. That is, in the case of a resin having a low heat distortion temperature, the amount of the inorganic filler is 20 to 60% by weight.
  • the resin having a high heat distortion temperature is polyetheretherketone, it is possible to sufficiently achieve the purpose even if the composition contains 3 to 30% by weight of titanium oxide blended as a pigment. Furthermore, in order to lower the “waviness” of the cutting surface, the temperature of the surface of the object to be cut does not increase.
  • the inorganic filler preferably has high thermal conductivity, and 15 W / mK or more is recommended. However, a suitable ratio for forming the heat conduction channel is 20% by weight or more.
  • the 15 W / mK filler includes metal powder and the like.
  • a thermally conductive inorganic filler having a Mohs hardness of 8 or less is selected.
  • magnesium oxide, boron nitride, aluminum nitride, aluminum oxide, calcium oxide, magnesium hydroxide, calcium hydroxide, aluminum borate etc. may be mentioned.
  • the inorganic filler When the inorganic filler is mixed into the resin, it is also included that known surface treatment agents of silane type and titanate type are used. In addition to this, a pigment may be blended to match the color of natural teeth and tooth base.
  • the material used for the model is not necessarily required to match the color of natural teeth or tooth base, but when transparency is high, the visibility of the technician is degraded, so coloring for opacity is preferable.
  • the formulation of the inorganic filler also plays this role.
  • thermoplastic resin Any thermoplastic resin may be used as long as it satisfies the cutting parameters, and the following resins are listed as general-purpose resins.
  • POM Polyacetal
  • PPE Polyphenylene ether
  • Polyester polypropylene terephthalate, polybutylene terephthalate, polyethylene terephthalate, polyethylene isophthalate, polycyclohexylene dimethyl terephthalate and glycol copolymer, polylactic acid) ⁇ Acrylic (PMMA) resin
  • PC aromatic polycarbonate, polyisosorbite carbonate
  • Polyolefins preferably, polypropylene, poly 4-methylpentene-1
  • Polysulfone sulfate ⁇ Polyether ketone ketone
  • thermosetting resins are currently limited to application to resin models because they are not intraoral dental care materials under the Pharmaceutical Affairs Law.
  • Polyurethane, polyurethane imide, melamine, phenol resin, urea resin and the like can be used.
  • Urethane resin and melamine phenol resin are suitable as the thermosetting resin.
  • a general purpose molding method for thermosetting resins is transfer molding. In recent years, with the emergence of injection molding for thermosetting materials, residual stress and residual distortion similar to thermoplastic resins are inherent, and therefore, they are the subject of the present invention. However, since stress and strain generated in the injection process are alleviated in the mold, transfer molding is less.
  • the residual stress is calculated from the residual strain and the elastic modulus specific to the material, but varies depending on the material. However, even if the material is highly resistant to residual stress, it is a weak point if there is a place where the stress / strain is reversely crossed inside the product. It may be selected so that such a reverse interface does not exist in the area to be cut, but industrially, it is a priority to reduce the reverse crossing interface in the product to be cut.
  • the cause of the stress-strain reverse crossing interface is the flow pattern in the mold especially in injection molding.
  • the molten resin has a specific relaxation time derived from viscosity and melt elastic modulus and melt storage elastic modulus by blending of molecular weight, molecular weight distribution, degree of fine crosslinking, inorganic filler, plasticizer, flame retardant and the like.
  • the molten resin is narrowed in the flow path from the heating cylinder of the injection molding machine to the tip injection nozzle, and receives complicated shear, heat history such as runners and gates in the mold, and fills the cavity from the mold gate. . At that time, while the molten resin conforms to the mold shape, the flow pattern is determined and flows according to the viscosity and the relaxation time.
  • the flow from the mold terminal is prioritized, and the terminal flows from the terminal to the gate in a reverse flow.
  • Residual strain is the cause of the interface between the compression direction and the tension direction.
  • the relaxation time is short, a flow eddy is generated near the vicinity of the gate, so a local residual strain is generated at the interface between the compression direction and the tension direction.
  • the flowability is low and the relaxation time is long, the flow is temporarily stopped on the mold surface, and distortion occurs due to disturbance of the semi-molten resin entering the solidification stage by the molten resin that flows later. Inverted phenomenon occurs.
  • the fact that the residual stress ratio is high when the residual stress is reversed is defined as follows.
  • the residual stress ratio is represented by the following equation in the cutting surface in the formed product before cutting. 20 points average value of residual stress relative ratio (Fn) ⁇
  • the 20-point average value of the relative ratio of residual stress is the relative relative average of residual stress when the cutting surface is equally divided into 20 at equal intervals.
  • a photoelastic stress analysis system was used to measure the relative residual stress.
  • the device manufactured and sold by Stress Photonics, Inc. of Laser Measurement Sales Co., Ltd. can be used as a measuring device.
  • GFP2400 When the product is transparent, GFP2400 is used, and the near infrared ray of the opaque product utilizes the property of transmitting the molded product, and was measured by NIR-GFP-1400. What is measured here is the software's own original numerical value of the measurement method, and relative comparison of the stress of the sample is possible by comparing the luminance value (camera unit) photographed by a camera.
  • the residual stress is known to be generated by the shear elongation history at molding, the compression history, and the residual stress due to the cooling / solidifying speed between the mold surface and the inside. Residual stress was determined for each of the 20 sections in the product length and width directions, and the ratio to the adjacent residual stress was used as a measure of stability.
  • Fig. 1 shows an injection sheet of NIR-GFP-1400, using a mold of 40 mm in length, 30 mm and 3 mm in thickness, having a film gate in a normal injection molding of polyacetal, at a mold temperature of 40 ° C.
  • the residual stress pattern is shown.
  • red is a tensile stress
  • blue is a portion where a compressive stress is generated.
  • the lower part hits the film gate.
  • the residual stress ratio average value in the flow direction (MD direction) at this time is 0.9.
  • the stress ratio at the location where stress crosses is 1.6.
  • FIG. 2 shows a residual stress pattern of a sheet molded at a mold temperature of 70 ° C., using a mold having flowability lower than that of polyacetal, and having a width of 70 mm, a length of 50 mm and a thickness of 5 mm.
  • the residual stress ratio average value in the flow direction perpendicular (TD line) is as high as 5.5, and the residual average value in the flow direction is as high as 1.17.
  • TD line residual stress ratio average value in the flow direction perpendicular
  • the results of cutting surface roughness are described using the above two examples as comparative examples.
  • the average value of the relative residual stress ratio is preferably 0.5 or less, more preferably 0.2 or less.
  • Production that can reduce the relative ratio of residual stress means raising the temperature to a temperature selected from the temperature range of +10 to 80 ° C. or the temperature range from the crystallization temperature to the melting point with respect to the glass transition temperature of the resin composition. It is to mold with a mold.
  • molding processing method of resin such as extrusion molding, injection molding, injection compression molding, compression molding, is applicable.
  • injection compression molding and press molding can be suitably used from the viewpoint of productivity.
  • the reduction of residual stress and its distribution at the molding stage is achieved by setting the molding characteristics of the resin composition to the following (1) or (2).
  • (1) In the case of an amorphous resin which is dominated by the glass transition temperature, the mold temperature is molded in the temperature range of the glass transition temperature +10 to 80 ° C.
  • (2) In the case of a crystalline resin in which the melting point is controlled, the mold temperature is molded with a mold heated to a temperature selected from the crystallization temperature to the melting point temperature range.
  • the resin composition is melted in advance at a cylinder temperature using an injection molding machine or a compression molding machine, and then the glass transition temperature +10 to 80 ° C.
  • the mold temperature is cooled to below the cooling solidification temperature of the resin composition by applying mold clamping and holding pressure, It becomes possible to take out the resin composition molded body from the mold.
  • the resin composition is melted in advance using an extruder and an injection molding machine, and then the mold temperature is raised to a temperature selected from the crystallization temperature to the melting point temperature range. And charge (or inject) the molten resin composition into the molding die, clamp the mold, apply a holding pressure, and cool the mold temperature to below the cooling solidification temperature of the resin composition to obtain resin from the mold
  • the composition molded body can be demolded.
  • the target can also be achieved by melting in a compression mold and shifting to a lower temperature while controlling the mold temperature.
  • a molten resin puddle is provided outside the final product shape, and trimming after mold removal is also a measure to avoid residual stress cross-over. It is.
  • FIG. 3 shows the experimental apparatus used in the example of the present invention.
  • FIG. 4 shows the contents of the materials and the like used in the experiments regarding the examples and comparative examples of the present invention.
  • Example 1 Polyacetal resin (Iupital) manufactured by Mitsubishi Engineering Plastics Co., Ltd., grade name TC3030, compound product of talc 30% by weight, heat deformation temperature 439 K are supplied to an injection compression molding machine J-ELII 55 manufactured by Japan Steel Works. Then, it was melted at a cylinder temperature of 200 ° C. and molded into a mold (80 mm ⁇ 80 mm, thickness 5 mm, film gate sheet) having an initial mold temperature set at 170 ° C. at an injection speed of 30 mm / s. The sheet was allowed to stand for 24 hours in a temperature-controlled room controlled to a room temperature of 23 ° C. and a humidity of 50 RH%, and then used as a cutting sheet.
  • J-ELII 55 injection compression molding machine
  • Example 2 5% by weight of titanium oxide CR63 manufactured by Ishihara Sangyo Co., Ltd. is blended with Mitsubishi Rayon Co., Ltd. polymethacrylic resin (the company name at the time of application: Mitsubishi Chemical Co.) grade VH4, and cylinder temperature 260 ° C with a biaxial compounder An extruded pellet was obtained.
  • the mold temperature is 120 ° C.
  • the cutting surface roughness cut with a milling machine was 5.5 ⁇ m.
  • the cutting parameter calculated from the tensile modulus of elasticity 3800 MPa and the high load HDT 369 K was 97.
  • melting occurs at the tip of the milling bar at room temperature, but it has been found that the cutting is possible even at room temperature by the inorganic filler filling as in this example.
  • Example 3 Melt at 280 ° C resin temperature is injected into a 160 ° C mold using a compound product of Mitsubishi Engineering Plastics, Inc., polyphenylene ether / polystyrene alloy resin (UPIAS), grade name TH620, 20% by weight of talc. A sheet was prepared as in Example 1. The cutting surface roughness cut with a milling machine was as good as 4.3 ⁇ m. The cutting parameter calculated from the tensile elastic modulus 5200 MPa and the high load HDT 388 K was 75.
  • UPIAS polyphenylene ether / polystyrene alloy resin
  • Example 4 40% by weight of talc MT7 manufactured by Fuji Talc Co., Ltd. is blended with polycarbonate resin (Novarex) manufactured by Mitsubishi Engineering Plastics Co., Ltd. and grade name 7025 R, and put into a double screw kneader TEX30 ⁇ manufactured by Japan Steel Works, Ltd. Compound temperature 290 ° C. Compound to obtain pellets. Next, an injection sheet was obtained at a mold temperature of 160 ° C. and an injection speed of 30 mm / s. The cutting surface roughness of this sheet was 7.0 ⁇ m. The cutting parameter calculated from the heat deformation temperature 425 K and the tensile elastic modulus 5700 MPa is 75.
  • Example 5 A PEEK resin sheet manufactured by EN'S INGER JAPAN CO., LTD., And graded TECAPEEK are pulverized to form a powder, and 10% by weight of titanium oxide CR60-3 manufactured by Ishihara Sangyo Co., Ltd. is blended to make a heat press machine MP- manufactured by Toyo Seiki Co. Ten sheets of 0.5 mm in thickness were prepared by SH. Thereafter, the sheets were stacked and heat pressed again. The respective hot pressing conditions are a heating temperature of 405 ° C., and a pressing pressure at the time of heating and cooling of 3 MPa. The cutting surface roughness is 6.5 ⁇ m. The cutting parameter calculated from the heat deformation temperature of 435 K and the tensile elastic modulus of 5200 MPa is 84.
  • Example 6 Melamine phenol manufactured by Taiwa Co., Ltd., grade name MP, is introduced into a disc-shaped mold having a diameter of 25 mm and a thickness of 4 mm. Thermal polymerization is carried out at a mold temperature of 170 ° C. for 5 minutes. Then, it cooled to room temperature. The cutting surface roughness is 5.2 ⁇ m. The cutting parameter calculated from the heat deformation temperature 453 K and the tensile elastic modulus 8800 MPa is 51.
  • Example 1 The material in Example 1 was evaluated by switching to a polyacetal manufactured by Mitsubishi Engineering Plastics, Inc., grade name F20-3 (without inorganic filler). As a result, it was found that the cutting surface roughness was 8 ⁇ m, and the cutting surface roughness was inferior to 3.8 ⁇ m in Example 1.
  • the cutting parameter calculated from the heat deformation temperature of 373 K and the tensile elastic modulus of 2900 MPa is 129.
  • Comparative Example 2 In Comparative Example-2, the mold temperature was changed to 40 ° C., using the same material as in Example-1. In this case, the cutting surface roughness was 4.3 ⁇ m. That is, it is understood that the variation of Comparative Example 2 is larger than that of Example 1.
  • Comparative Example 3 Injection molding was performed on a polymethacrylic resin manufactured by Mitsubishi Rayon Co., Ltd. (the company name at the time of application: Mitsubishi Chemical Co., Ltd.) and grade VH 4 in the same manner as in Example 2.
  • the mold temperature is 60 ° C.
  • the cutting surface roughness cut with a milling machine was 6.2 ⁇ m.
  • the tensile modulus of elasticity was 3300 MPa, and the high load HDT was 111, the cutting parameter calculated from 367 K.
  • melting occurs at the tip of the milling bar at room temperature, but it has been found that the cutting is possible even at room temperature by the inorganic filler filling as in this example.
  • Comparative Example 4 A polycarbonate resin manufactured by Mitsubishi Engineering Plastics, Inc., grade name Novarex 7025R used in Example 4 was injection molded under the same conditions as in Example 4. This cutting surface roughness is extremely large at 13 ⁇ m.
  • the cutting parameter calculated from the heat deformation temperature 402 K and the tensile elastic modulus 2400 MPa is 168.
  • Comparative Example 5 A biopolycarbonate resin, Durabio D7340AR, manufactured by Mitsubishi Chemical (at the time of application Mitsubishi Chemical Co., Ltd.) was pressed at a molding temperature of 280 ° C. This cutting surface roughness is extremely large at 16 ⁇ m. The cutting parameter calculated from the heat deformation temperature 379 K and the tensile elastic modulus 2750 MPa is 138.
  • Example 6 The PEEK resin manufactured by EN'S INGER JAPAN CO., LTD. Applied in Example 5 is commercially available as a natural TECAPEEK extruded product without containing any inorganic filler. I tried cutting directly from the sheet. As a result, the cutting surface roughness was 8 ⁇ m. It was found to be inferior as compared to Example 5 containing titanium oxide. The cutting parameter calculated from the heat deformation temperature 425 K and the tensile elastic modulus 4100 MPa is 104. In addition, when the feed rate of the milling bar was lowered to 64 mm / min, the cutting surface roughness was 5.2 ⁇ m. In order to obtain the same surface roughness, it can be seen that Example-5 can cut at a speed 1.2 times faster than Comparative Example-6.
  • Example-1 to Example-6 From the results of Example-1 to Example-6, it was found that when the cutting parameters are all 100 or less, good cutting surface roughness is obtained regardless of the resin. In each of Comparative Example 1 and Comparative Example 3 to Comparative Example 6, when no inorganic filler was blended, and when the cutting parameter exceeded 100, the cutting surface roughness was found to be inferior.
  • Example and Comparative Example-A A sample obtained by injection molding the polyacetal of Example 1 at a mold temperature of 50 ° C. is used. This sample is cut at three locations near the gate in the product, at the center and at the product end. As a result, it was found that the variation is large such that the cutting surface roughness is 2 to 7 ⁇ m. The average value is 4.3 ⁇ m, which is approximately the same as in Example 1. However, the coefficient of variation of standard deviation / mean value was 35%.
  • the residual stress pattern is measured by Laser Measurement NIR-GFP-1400. Then, according to the definition, from the gate to the fluid end was divided into 20 equal parts, and the rate of change of each difference was measured. As a result, the residual stress ratio was 0.9, but the value near the stress crossover point in the central portion of the sheet was 1.6.
  • the coefficient of variation in cutting roughness in Example 1 was 10%, and the residual stress ratio was 0.2.
  • Example and Comparative Example-B When the polycarbonate resin of Comparative Example 3 was injection molded at an injection speed of 30 mm / s, the cutting surface roughness was 13 microns. The residual stress ratio at that time was measured by Laser Measurement GFP2400 Co., Ltd. As a result, the average residual stress ratio at flow direction 20 points from the gate portion to the flow end was 1.17. On the other hand, the injection-molded sheet was pressed at a pressure of 3 MPa with a 280 ° C. heating press, and then the heating heater was turned off and allowed to stand at room temperature until the next day. The residual stress ratio of this sheet was found to be extremely low at 0.01. However, since the filler is not blended, the cutting surface roughness is not greatly improved such as 12 ⁇ m.
  • the present invention a resin composition for cutting having a shortened cutting time and an excellent appearance of a material to be cut, a resin molding for cutting including the resin composition for cutting, and a method for producing them are provided. can do.

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Abstract

L'invention fournit une composition de résine pour découpe excellente en termes de raccourcissement de durée de découpe et d'apparence d'objet à découper, un article moulé en résine pour découpe contenant cette composition de résine pour découpe, et un procédé de fabrication de celui-ci. La composition de résine pour découpe de l'invention a pour structure de base 100% en masse au total de 40 à 97% en masse d'une résine et de 60 à 3% en masse d'un matériau de charge inorganique. Ses paramètres de découpe calculés à partir de sa température de déformation à la chaleur et de son module d'élasticité à la traction sont inférieurs ou égaux à 100.
PCT/JP2017/022967 2017-06-22 2017-06-22 Composition de résine pour découpe, et article moulé en résine pour découpe ainsi que procédé de fabrication de celui-ci WO2018235218A1 (fr)

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JP2018512344A JP6427717B1 (ja) 2017-06-22 2017-06-22 切削用樹脂組成物、切削用樹脂成形体及びその製造方法
PCT/JP2017/022967 WO2018235218A1 (fr) 2017-06-22 2017-06-22 Composition de résine pour découpe, et article moulé en résine pour découpe ainsi que procédé de fabrication de celui-ci

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08301716A (ja) * 1995-05-10 1996-11-19 Advance Co Ltd 代用歯冠及びその製法
JPH10323353A (ja) * 1997-05-26 1998-12-08 G C:Kk 歯科用レジン材料及びその作製方法
JP2017048121A (ja) * 2015-08-31 2017-03-09 三井化学株式会社 歯科用組成物、歯科用ミルブランク、歯科部材及びその製造方法、義歯床及びその製造方法、並びに、有床義歯及びその製造方法
WO2017073572A1 (fr) * 2015-10-26 2017-05-04 株式会社トクヤマデンタル Bloc de résine et procédé pour le produire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08301716A (ja) * 1995-05-10 1996-11-19 Advance Co Ltd 代用歯冠及びその製法
JPH10323353A (ja) * 1997-05-26 1998-12-08 G C:Kk 歯科用レジン材料及びその作製方法
JP2017048121A (ja) * 2015-08-31 2017-03-09 三井化学株式会社 歯科用組成物、歯科用ミルブランク、歯科部材及びその製造方法、義歯床及びその製造方法、並びに、有床義歯及びその製造方法
WO2017073572A1 (fr) * 2015-10-26 2017-05-04 株式会社トクヤマデンタル Bloc de résine et procédé pour le produire

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