WO2010061872A1 - 溶融混練方法、押出し物及び透明樹脂材 - Google Patents
溶融混練方法、押出し物及び透明樹脂材 Download PDFInfo
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- WO2010061872A1 WO2010061872A1 PCT/JP2009/069919 JP2009069919W WO2010061872A1 WO 2010061872 A1 WO2010061872 A1 WO 2010061872A1 JP 2009069919 W JP2009069919 W JP 2009069919W WO 2010061872 A1 WO2010061872 A1 WO 2010061872A1
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- screw
- melt
- resin
- kneading
- blend
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- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
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- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
- B29B7/125—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft having a casing closely surrounding the rotor, e.g. for masticating rubber ; Rotors therefor
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Definitions
- the present invention uses a high shear molding apparatus equipped with an internal feedback type screw to melt and knead an incompatible polymer blend, whereby one polymer component is used as a matrix, and the other polymer component is added to this matrix.
- the dispersion phase size is controlled at a level of several tens of nanometers and dispersed, and an extrudate of a nanodispersed polymer blend having a microscopic dispersion structure (a kneaded product extruded by kneading with a high shear molding apparatus, film And a sheet-like shape), and an extrudate of a nano-dispersed polymer blend produced by this melt-kneading method.
- the present invention is, for example, excellent in transparency having a transmittance of 80% or more in the visible wavelength region (400 nm to 700 nm), and is used in the optical field, and has excellent mechanical properties.
- the present invention relates to an extrudate of a polymer blend and a production method thereof.
- Non-Patent Document 1 the reactive processing technology discovered 30 years ago is a method of reducing the interfacial tension by causing a reaction between functional groups existing between blend components, thereby reducing the size of the dispersed phase.
- Non-Patent Document 1 the reactive processing technology discovered 30 years ago is a method of reducing the interfacial tension by causing a reaction between functional groups existing between blend components, thereby reducing the size of the dispersed phase.
- admixtures of additives such as compatibilizers and reaction products generated by reactive processing methods are structural defects in optical materials and electronic / electrical materials that require a continuous and pure microstructure. In other words, it is a “foreign substance”, which has a drawback that it becomes a large obstacle in practical use.
- the present invention aims to solve the above-mentioned problems that have arisen conventionally, without adding any extra additives such as a compatibilizer to the incompatible polymer blend system,
- a compatibilizer such as a compatibilizer to the incompatible polymer blend system
- melt-kneading using a high shear molding apparatus equipped with an internal feedback screw one polymer component is used as a matrix, and the other polymer component is dispersed, and the dispersed phase size is 300 nm or less, more preferably It is an object of the present invention to realize a melt-kneading method for producing an extrudate (including a film or a sheet) of a polymer blend having a microscopic dispersion structure controlled to 100 nm or less, and the extrudate.
- the present invention provides at least two types of incompatible blended resins in a melt-kneading unit including a cylinder, a screw, a material charging unit, and a heating unit. And a melt-kneading step in which the incompatible blended resin is melt-kneaded under the conditions of a screw rotation speed of 600 rpm to 3000 rpm and a shear rate of 900 to 4500 sec ⁇ 1.
- a melt kneading method is provided.
- the present invention provides at least two types of incompatible blended resins to a melt-kneading unit having a cylinder, a screw, a material charging unit, and a heating unit. And feeding the melt-kneaded resin from the rear end to the front end of the screw under the conditions of the charging step and the screw rotation speed of 600 rpm to 3000 rpm and the shear rate of 900 to 4500 sec ⁇ 1. And a melt-kneading step for performing melt-kneading of the incompatible blended resin by circulating back to the rear end of the screw from the gap. To do.
- the present invention provides at least two types of incompatible blended resins in a melt-kneading part including a cylinder, a screw, a material charging part, a heating part, and a seal.
- the gap between the feeding step of feeding from the feeding section and the tip surface of the screw and the seal surface facing the tip surface is 0 to 5 mm
- the hole inner diameter of the screw is 1 mm to 5 mm
- the rotational speed of the screw is 600 rpm to 3000 rpm
- shear When the speed is 900 to 4500 sec ⁇ 1 , in the case of an amorphous resin, it is heated to a temperature higher than the glass transition point, and in the case of a crystalline resin, it is heated to a temperature higher than the melting point thereof.
- the incompatible block is circulated through the gap to return to the rear end of the screw.
- a melt-kneading method characterized in that it comprises a melt-kneading step for melt-kneading command has been resin.
- the incompatible blended resin is preferably 97 to 3% by weight of polycarbonate and 3 to 97% by weight of methacrylic resin.
- the methacrylic resin is preferably polymethyl methacrylate, polyethyl methacrylate, or polybutyl methacrylate.
- the melt-kneaded resin may be molded and extruded as an extrudate.
- the present invention provides an extrudate characterized by being manufactured by the above melt-kneading method.
- the extrudate is any one of a rod, a film, a sheet, and a fiber.
- the extrudate preferably has a configuration in which a dispersed phase having a size of 300 nm or less, preferably 100 nm or less, is uniformly dispersed in a matrix resin.
- the extrudate preferably has a transmittance of 80% or more in a visible wavelength region of 400 nm to 700 nm when formed into a film having a thickness of 100 ⁇ m.
- a high shear molding apparatus equipped with an internal feedback screw is used without adding an extra additive such as a compatibilizing agent even in an incompatible blend system that does not dissolve in a stationary field.
- a polymer blend extrudate having the above structure that is, a dispersed phase of 300 nm or less, preferably 100 nm or less, can be easily realized. Is possible.
- the dispersed phase size of the other polymer component is controlled to a diameter of 300 nm or less, preferably 100 nm or less. It is possible to produce a polymer blend extrudate (including a film or a sheet) having a dispersed structure or a structure (co-continuous structure) in which both polymer components are continuously connected microscopically.
- one of the blend components has a diameter of 300 nm or less, preferably 100 nm or less, and is microscopically mixed with the other.
- the inherent properties of the polymers that make up the blend can be demonstrated synergistically, providing extremely high performance and high functionality with added value. It is possible to create high materials.
- the production method according to the present invention is a simple method in which melt kneading is simply performed using a high shear molding apparatus equipped with an internal feedback screw, and it is necessary to add any extra additive such as a compatibilizer. Therefore, an optimal method can be provided for optical materials and electronic / electrical materials that require a continuous and pure microstructure.
- PC polycarbonate
- PMMA polymethyl methacrylate
- PEMA polyethyl methacrylate
- PBMA polybutyl methacrylate
- FIG. 1 is a diagram showing a material kneading section in a high shear molding apparatus equipped with an internal feedback screw used in the manufacturing method according to the present invention. It is a figure which shows the principal part (screw front-end
- FIG. 4 (a), (b) and (c) are different scales showing the microscopic dis
- curve 1 is a single PMMA
- curve 2 is a single PC
- Curve 3 is a PC / PMMA blend produced under low shear (screw rotation speed 300 rpm, kneading time 2 minutes), and curve 4 is high shear (screw rotation speed 1800 rpm, kneading time 2 minutes).
- the produced PC / PMMA 80/20 blend.
- FIG. 8 shows a block diagram of the plasticizer integrated high shear molding apparatus.
- This apparatus includes a “plasticizer” (symbol 61) provided with a “sample feeder” (symbol 61) for feeding a pre-dried sample of a predetermined ratio, and a “valve” for a sample kept in a molten state at a constant temperature.
- a “plasticizer” symbol 61
- a sample feeder symbol 61
- a “valve” for a sample kept in a molten state at a constant temperature.
- a “high shearing portion” (reference numeral 65) is provided for supplying a constant amount by opening and closing to perform high shear.
- the “high shear portion” is connected to a “drive portion” (reference numeral 64) for rotating the internal feedback screw at a high speed.
- the screw rotation speed is 600 rpm to 3000 rpm, the screw is rotated, and the incompatible polymer blend system is melt-kneaded, so that A polymer blend extrudate and a transparent resin material are produced in which the molecular component is a matrix and the dispersed phase size of the other polymer component is controlled to 300 nm or less, preferably 100 nm or less.
- the “extrudate” produced in the present invention may be a simple kneaded extrudate (referred to as “kneaded product”) or an extrudate formed into a sheet-like shape by molding (referred to as “molded product”). ).
- methacrylic resin polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), polybutyl methacrylate (PBMA) or the like is used.
- a dry blending method in which the mixture is mixed in a granular state can be used.
- polycarbonate and methacrylic resin were dried in vacuum at 80 ° C. for 12 hours.
- the polycarbonate and the methacrylic resin are incompatible with each other, and in order to obtain a blended product thereof, both are usually mixed at 200 to 240 ° C. using a biaxial melt kneader or the like.
- the internal structure of these extrudates is a so-called phase-separated structure in which when one component is a matrix, the dispersed phase size of the other component is coarsened to a level of several microns to several tens of microns. For this reason, the size of the dispersed phase is larger than the wavelength in the visible region, resulting in an opaque material.
- blended with polycarbonate and methacrylic resin was installed with an internal feedback type screw instead of a normal twin screw type kneader.
- a dispersed phase (methacrylic resin) having a diameter of 300 nm or less, preferably 100 nm or less is uniformly and densely dispersed in the polycarbonate matrix phase.
- the present inventors have found an epoch-making finding that a blended extrudate and a transparent resin material having a nano-dispersed structure can be obtained. The same result was obtained in the case of a blend in which a polycarbonate dispersed phase was formed in a methacrylic resin matrix phase.
- FIG. 1 shows a high shear molding apparatus equipped with an internal feedback screw produced by the present inventors. Since this high shear molding apparatus itself is substantially the same as the high shear molding apparatus introduced in the above-mentioned Patent Document 1, a brief description will be given here. Use it after adjusting according to the following procedure.
- the high shear molding apparatus 10 includes a melt-kneading unit 12 and a molding unit 14.
- the molding part 14 has an extrusion molding part or an injection molding part.
- the melt-kneading unit 12 includes a material charging unit 16, a cylinder 18, a feedback screw 20 mounted in the cylinder 18, and a shaft 24 connected to the cylinder 18 via a bearing 22.
- the cylinder 18 includes a heater 26 for melting the resin in the cylinder 18.
- the cylinder 18 is provided with a sealing member 28 for sealing between the molding part 14 and the opposite end of the shaft 24 of the cylinder 18.
- the cylinder 18 includes a front end surface 29 of the screw 20 and a seal surface of the seal member 28 facing the front end surface 29 (hereinafter referred to as “seal surface 28”).
- Adjustment means for adjusting the gap (gap) 32 is provided on the screw rear side. The distance 32 is adjusted within a range of about 0.5 to about 5 mm.
- the extrusion molding section which is the molding section 14 includes an extrusion section heater 35 and a film creation T-die 34.
- the T die 34 includes a T die front end heater 36 and a T die rear end heater 38.
- the extruded film passes through the discharge port 40 between the heaters 36 and 38 at both ends.
- a thermocouple 42 is attached to the extrusion part and the T-die tip heater 36 to measure the temperature. The measurement result is sent to a control device (not shown) to adjust the temperature of the melt-kneading unit 12 and the temperature of the T die.
- the screw 20 has a hole 44 with an inner diameter of about 1 mm to about 5 mm, preferably about 2 mm to about 3 mm, the rotational speed of the screw is 600 rpm to 3000 rpm, and the shear rate is 900 to 4500 sec ⁇ 1 .
- the temperature in the cylinder 18 varies depending on the melt-kneaded resin, but is set to a temperature higher than the glass transition point in the case of an amorphous resin and higher than the melting point in the case of a crystalline resin. In the present invention, it is preferable to heat and melt at 230 to 240 ° C.
- the screw 20 has a structure in which at least two types of incompatible blended resins are sufficiently melted and kneaded inside the screw 20.
- FIG. 3 shows an internal feedback structure 46 of resin in the feedback screw 20.
- the internal feedback type structure 46 sufficiently kneads the mixed resin introduced from the screw rear stage 48 while feeding it to the screw front stage 50 by the screw 20, and opposes the kneaded resin to the most distal surface 29 of the screw 20 and the front end surface thereof.
- the resin confined in the space 32 with the seal surface 28 and further kneaded is put into a hole 44 provided in the longitudinal direction at substantially the center of the screw 20, and returned to the subsequent stage of the screw 20 again.
- the kneading time in the internal feedback type structure 46 can be arbitrarily changed depending on the time for circulating through the internal feedback type structure 46.
- the degree of kneading is adjusted by varying the distance 32 between the tip surface of the screw 20 and the seal surface 28 facing the tip surface and the inner diameter of the hole 44 of the screw 20.
- the degree of kneading increases as the interval 32 is narrowed and the inner diameter of the hole 44 of the screw 20 is decreased.
- the interval 32 and the inner diameter of the hole 44 of the screw 20 are optimal in consideration of the viscosity of the resin. It is necessary to make it.
- the mixing time of the resin in the cylinder 18 is 5 seconds to 10 minutes.
- melt-kneading can be performed without adding an additive such as a compatibilizer to an incompatible blend resin. Then, when one polymer component is used as a matrix by melt kneading, a polymer blend extrudate and a transparent resin material in which the dispersed phase size of the other polymer component is controlled to a diameter of 300 nm or less, preferably 100 nm or less are prepared. Is done.
- the high shear molding apparatus 10 cools the cylinder 18 (not shown, but for example, flows cooling water around the cylinder 18. Structure, etc. (see paragraph 0038 of FIG. 5 of the specification of Patent Document 1).
- the molding process conditions include not only the setting of the specific temperature (230 to 240 ° C.) but also the setting of the screw rotation speed and the kneading time in the molding apparatus. is important.
- the screw rotation speed can be set to 600 to 3000 rpm and the kneading time can be set to 5 seconds to 60 minutes, but the rotation speed and the kneading time can be set to 1200 to 2500 rpm and 5 seconds to 4 minutes, respectively. The optimum result was obtained.
- the production method according to the present invention is characterized in that high shear molding is performed under the specific temperature conditions described above, with the screw rotation speed and kneading time being the optimum numerical conditions.
- high shear molding is performed under the specific temperature conditions described above, with the screw rotation speed and kneading time being the optimum numerical conditions.
- the distance 18 between the tip surface 29 of the screw 20 and the seal surface facing the tip surface in the cylinder 18 filled with the blend and the screw 20 By varying the inner diameter of the hole 44, the strength of the shear flow field or the degree of kneading can be adjusted.
- the interval 32 can be set to an arbitrary value between 1 mm and 5 mm at intervals of 0.5 mm, and the inner diameter of the hole 44 of the screw 20 is similarly set to an arbitrary value of 0.5 ⁇ between 1 ⁇ and 5 ⁇ .
- the interval can be set, an optimum result could be obtained by setting the interval 32 and the inner diameter of the hole 44 of the screw 20 to 1 to 2 mm and 2.5 ⁇ , respectively.
- high shear molding is performed under the above-mentioned specific temperature with optimum values for the gap (gap) between the tip surface of the screw and the seal surface facing the tip surface and the inner diameter of the screw hole.
- Example 1 About the present invention, an example which manufactures polymer blend extrudate and transparent resin material from polycarbonate and methacrylic resin as an incompatible polymer blend is explained.
- Panlite L-1225L, L-1225Y or L-1250Y all trade names manufactured by Teijin Chemicals Ltd. was used as the raw material polycarbonate.
- CM-205 or CM-207 both trade names
- Taiwan Chimi Industry Co., Ltd. or Sumipex LG21 trade names made by Sumitomo Chemical Co., Ltd. was used.
- the temperature of the resin was controlled so as not to exceed 250 ° C. by using a cooling means for cooling the cylinder.
- a cooling means for cooling the cylinder By such a process, an extrudate having a good surface condition could be obtained.
- FIG. 4 (a), (b) and (c) are photographs showing the microscopic dispersion structure of the extrudate obtained in this example.
- the microscopic dispersion structure was measured using a transmission electron microscope (TEM) (Hitachi H7600) at an acceleration voltage of 100 kV. The photograph in this TEM observation was taken as a digital image with a CCD camera.
- TEM transmission electron microscope
- the blended sample was stained with ruthenium tetroxide (RuO 4 ) for 30 seconds, and then an ultrathin section (120 nm) was prepared by an ultramicrotome (Leica Ultracut UCT) and developed on a collodion-attached mesh.
- RuO 4 ruthenium tetroxide
- FIG. 4 (c) shown for comparison is a transmission electron microscope (TEM) photograph of a sample prepared by kneading for 2 minutes with a screw rotation speed of 300 rpm as a sample under low shear.
- TEM transmission electron microscope
- the optical transmittance of each sample is in the ultraviolet / visible wavelength region using a commercially available JASCO V-550 (trade name) UV / VIS IV spectrophotometer with each sample in a film state having a thickness of 100 ⁇ m. Measured in
- curve 1 is a transmittance curve of polymethyl methacrylate alone
- curve 3 is a transmittance curve of polycarbonate alone.
- the transmittance is 80% or more in a wavelength region of 400 nm or more, and it can be seen that they are highly transparent materials.
- DMA dynamic viscoelasticity measurement
- stress-strain measurement was performed.
- the dynamic viscoelasticity measurement was performed in a stretching mode using a Rheobibron DDV-25FP-S (produced by Orientec Co.). The measurement was performed in the range of ⁇ 150 ° C. to 240 ° C. at a temperature rising rate of 3 ° C./min and a frequency of 1 Hz.
- a dumbbell-shaped sample was prepared, and a crosshead speed of 10 mm / min and a temperature of 25 using a tensile tester Tensilon UMT-300 (manufactured by Orientec Co.) in accordance with the ASTM D41-80 test method. The test was performed at a temperature of 50 ° C. and a humidity of 50%.
- FIG. 6 shows the relationship between tan ⁇ and temperature measured by dynamic viscoelasticity.
- the peak temperature of tan ⁇ here corresponds to the glass transition temperature (Tg).
- Tg glass transition temperature
- the Tg of PMMA is 115 ° C and that of PC is 162.5 ° C.
- the Tg was 152.5 ° C., and the Tg was improved by 37 ° C. That is, it was found that the heat resistance was remarkably improved in the blend sample.
- Fig. 7 shows the stress-strain curve.
- curve 1 is a single PMMA, and breaks before almost extending.
- curve 2 is a single PC, and breaks when it extends nearly 120%.
- the elongation at break was significantly improved by reducing the size of the dispersed phase.
- Example 2 About the present invention, an example which manufactures polymer blend extrudate and transparent resin material from polycarbonate and methacrylic resin as an incompatible polymer blend is explained.
- Panlite L-1225L, L-1225Y or L-1250Y all trade names manufactured by Teijin Chemicals Ltd. was used as the raw material polycarbonate.
- CM-205 or CM-207 both trade names
- Taiwan Chimi Industry Co., Ltd. or Sumipex LG21 trade names made by Sumitomo Chemical Co., Ltd. was used.
- FIG. 8 shows a block diagram of a plasticizer integrated high shear molding device (NHSS2-28 manufactured by Niigata Machine Techno Co., Ltd.).
- This apparatus includes a “plasticizer” (symbol 61) provided with a “sample feeder” (symbol 61) for feeding a pre-dried sample of a predetermined ratio, and a “valve” for a sample kept in a molten state at a constant temperature.
- a “high shearing portion” (reference numeral 65) is provided for supplying a constant amount by opening and closing to perform high shear.
- the “high shear portion” is connected to a “drive portion” (reference numeral 64) for rotating the internal feedback screw at a high speed.
- This plasticizing part integrated high shear molding apparatus is not only connected to the plasticizing part, but also can be operated continuously unattended because each part of the apparatus is automatically controlled.
- the apparatus used in Example 1 Are different.
- the temperature of the resin was controlled so as not to exceed 250 ° C. by using a cooling means for cooling the cylinder.
- a cooling means for cooling the cylinder By such a process, an extrudate having a good surface condition could be obtained.
- FIGS. 9A and 9B are photographs showing the microscopic dispersion structure of the extrudate and the transparent resin material obtained in this example.
- the microscopic dispersion structure was measured using a transmission electron microscope (TEM) (JEM 1230 manufactured by JEOL Ltd.) at an acceleration voltage of 120 kV. The photograph in this TEM observation was taken as a digital image with a CCD camera.
- TEM transmission electron microscope
- the blended sample was stained with ruthenium tetroxide (RuO 4 ) for 30 seconds, and then an ultrathin section (120 nm) was prepared by an ultramicrotome (Leica Ultracut UCT) and developed on a collodion-attached mesh.
- RuO 4 ruthenium tetroxide
- a polycarbonate (PC) matrix is stained in black, and a polymethyl methacrylate (PMMA) domain having a very fine size of about 10 nm in the PC (white circle portion).
- PC polycarbonate
- PMMA polymethyl methacrylate
- FIG. 9B a black dyed PC domain having a size of 30 to 40 nm is observed in a white PMMA matrix.
- polymethyl methacrylate domains or polycarbonate domains having a size of about 10 nm or a size of about 30 to 40 nm exist uniformly.
- Example 2 forms a fine domain structure that is an order of magnitude smaller than Example 1.
- high shear kneading was performed at 1800 rpm for 2 minutes, whereas in Example 2, a plasticized part integrated type apparatus was used, so the sample melted in advance in the plasticizing part was high. This is due to the effect of carrying out high shear kneading in a short time of 20 seconds at 2250 rpm by being put into the shearing part.
- the blend is composed of polymers having different refractive indexes, the effect of scattering becomes remarkable and the transparency is impaired when the dispersed phase size increases.
- the dispersed phase size is 100 nm or less as in the blend prepared according to the present invention, the transparency is remarkably secured.
- the refractive index of the PC / PMMA blend extrudate and transparent resin material film (thickness 0.5 mm) produced in Example 2 was measured using an Abbe refractometer DR-M2 manufactured by Atago Co., Ltd. Measured at room temperature at 589 nm.
- the incompatible polymer blend is melt-kneaded using a conventional molding machine (screw rotation speed of about 300 rpm)
- the internal structure of the blend extrudate is phase-separated, that is, one polymer component is used as a matrix.
- the dispersed phase size of the other polymer component became several tens of micrometers, and the synergistic effect by blending was lost, and the desired performance / function could not be exhibited.
- the transparent resin polycarbonate and methacrylic resin according to the present invention were blended by the prior art, a transparent blend could not be obtained, and only a cloudy product was obtained.
- the dispersed phase of the other polymer component is 300 nm or less in diameter and is finer Is a polymer blend extrudate and transparent resin material having a microscopically dispersed structure uniformly dispersed with a size of 100 nm or less, or a structure in which both polymer components are microscopically continuously connected to each other. can get.
- the present invention synergistically exhibits the inherent properties of the polymer that constitutes the blend, compared to the conventional phase-separated material with a large dispersed phase size (several micrometers or more) having a sea / island structure. Therefore, it is possible to create extremely high performance, high functionality, and high value-added materials, and materials that require transparency for various applications that require continuous and pure microstructures, optical materials, electronic and electronic materials. It is extremely useful as an electrical material.
- a methacrylic resin which is a transparent resin
- the methacrylic resin lacks heat resistance
- the desired heat resistance is optimized by the amount of polycarbonate added in the nanoblending according to the invention.
- methacrylic resin has a high elastic modulus and excellent rigidity, but has poor elongation at break and lacks ductility.
- Polycarbonate (PC) is inferior in rigidity to methacrylic resin, but excellent in ductility. Therefore, by creating a PC / PMMA blend with a mixed and dispersed structure at the nano level, it is possible to compensate for the disadvantages of the both and provide an optimal material that is balanced mechanically, that is, a balance between rigidity and ductility. be able to.
- the mechanical properties of these materials are also reflected in the surface hardness.
- the pencil hardness of PMMA is as hard as around 3H, and it is hard to be scratched, but it is easily scratched because it is as soft as 2B. That is, even though PC has better heat resistance than PMMA, its surface hardness is low, so it is not suitable for a material that uses PC as a surface or outside. Therefore, by preparing a PC / PMMA blend with a structure mixed and dispersed at the nano level according to the present invention, the material having a balanced surface hardness, that is, the pencil hardness of the material surface is optimized between 3H and 2B by the blend composition. It has become possible to provide a transparent material having a reduced pencil hardness.
- the transparent resin blend according to the present invention is required to provide an optical material that requires a refractive index between these values.
- a material having an optimized refractive index can be provided.
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Abstract
Description
12 溶融混練部
14 成形部
16 材料投入部
18 シリンダー
20 フィードバック型スクリュー
22 軸受け
24 シャフト
26 ヒーター
28 シール部材(シール面)
29 スクリューの最先端面
32 スクリューの最先端面との間隔(ギャップ)
35 押出部ヒーター
36 Tダイ先端ヒーター
38 Tダイ後端ヒーター
40 排出口
42 熱電対
44 スクリューの孔
46 内部帰還型構造
48 スクリュー後段
50 スクリュー前段
61 試料投入部
62 可塑化部
63 バルブ
本発明について、非相溶性高分子ブレンドとして、ポリカーボネート及びメタクリル系樹脂より高分子ブレンド押出し物及び透明樹脂材を製造する実施例を説明する。この実施例では、原料のポリカーボネートは、帝人化成(株)社製パンライトL-1225L、L-1225YまたはL-1250Y(いずれも商品名)を用いた。
ここでは、200nm前後のサイズであるポリメチルメタクリレートドメインが均一かつ密にポリカーボネートマトリクス相に存在することが分かった。このようなナノ分散構造はポリカーボネート/ポリメチルメタクリレート=97/3~3/97ブレンドという広範なブレンド組成において、即ちマトリクス相が相互に変わっても観察することができた。
本発明について、非相溶性高分子ブレンドとして、ポリカーボネート及びメタクリル系樹脂より高分子ブレンド押出し物及び透明樹脂材を製造する実施例を説明する。この実施例では、原料のポリカーボネートは、帝人化成(株)社製パンライトL-1225L、L-1225YまたはL-1250Y(いずれも商品名)を用いた。
試料 屈折率
PC 1.585
PC/PMMA=80/20 1.573
PC/PMMA=20/80 1.511
PMMA 1.492
このように、PC単体の屈折率1.585とPMMAの1.492との間の屈折率をもつ透明樹脂材をPC/PMMA透明ブレンドにより作製することができ、PC/PMMA=80/20ブレンドで1.573、PC/PMMA=20/80ブレンドで1.511であった。
また、相容化剤等の余分な添加物を加えてしまうと、サブミクロンレベルの分散相サイズは実現できても、不純物が混入しているため連続的かつ純粋な微細構造を必要とする光学材料や電子・電気材料には実用上大きな障害となる方法であった。
Claims (9)
- 少なくとも2種類の非相溶性のブレンドされた樹脂を、シリンダーと、スクリューと、材料投入部と、加熱部とを備えた溶融混練部に該材料投入部から投入する投入工程と、
前記スクリューの回転数が600rpmから3000rpm、せん断速度が900から4500sec-1の条件下で、前記非相溶性のブレンドされた樹脂の溶融混練を行う溶融混練工程と、
を備えることを特徴とする分散相構造のブレンド樹脂を製造するための溶融混練方法。 - 少なくとも2種類の非相溶性のブレンドされた樹脂をシリンダーと、スクリューと、材料投入部と、加熱部とを備えた溶融混練部に該材料投入部から投入する投入工程と、
前記スクリューの回転数が600rpmから3000rpm、せん断速度が900から4500sec-1の条件下で、前記溶融混練した前記樹脂をスクリューの後端から先端に送り前記スクリューの先端の間隙に閉じ込めた後、該間隙から前記スクリューの後端に戻す循環を行って前記非相溶性のブレンドされた樹脂の溶融混練を行う溶融混練工程と、
を備えることを特徴とする分散相構造のブレンド樹脂を製造するための溶融混練方法。 - 少なくとも2種類の非相溶性のブレンドされた樹脂をシリンダーと、スクリューと、材料投入部と、加熱部と、シールとを備えた溶融混練部に該材料投入部から投入する投入工程と、
前記スクリューの先端面と該先端面に対向したシール面との間隔が0から5mm、スクリューの孔内径が1mmから5mm、スクリューの回転数が600rpmから3000rpm、せん断速度が900から4500sec-1、非晶性樹脂の場合にはガラス転移点より高い温度に、結晶性樹脂の場合にはその融点より高い温度に加熱して前記樹脂をスクリューの後端から先端に送り前記スクリューの先端の間隙に閉じ込めた後、該間隙から前記スクリューの後端に戻す循環を行って前記非相溶性のブレンドされた樹脂の溶融混練を行う溶融混練工程と、
を備えることを特徴とする分散相構造のブレンド樹脂を製造するための溶融混練方法。 - 前記少なくとも2種類の非相溶性のブレンドされた樹脂は、ポリカーボネートが97~3重量%、及びメタクリル系樹脂が3~97重量%であることを特徴とする請求項1ないし3のいずれか1項に記載の分散相構造のブレンド樹脂を製造するための溶融混練方法。
- ポリカーボネートが97~3重量%、及びメタクリル系樹脂が3~97重量%であり、かつマトリックス樹脂(ポリカーボネートまたはメタクリル系樹脂)中に300nm以下、より好ましくは100nm以下のサイズを有する分散相(メタクリル系樹脂またはポリカーボネート)が均一に分散されており、厚さ100μmのフィルムにしたときに、可視部の波長領域である400nm~700nmにおいて80%以上の透過率を有する透明樹脂材。
- 前記メタクリル系樹脂は、ポリメチルメタクリレート、ポリエチルメタクリレート又はポリブチルメタクリレートであることを特徴とする請求項5記載の透明樹脂材。
- ポリカーボネートが添加されたことにより破断伸びが改善された透明樹脂材。
- 請求項1ないし4のいずれか1項記載の溶融混練方法により製造されたことを特徴とする押出し物。
- 前記押出し物は、ロッド、フィルム、シート、ファイバーのいずれか1つであることを特徴とする請求項8記載の押出し物。
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US13/131,330 US8975336B2 (en) | 2008-11-26 | 2009-11-26 | Method of melt kneading, extrudate, and transparent resin material |
JP2010540499A JP5697143B2 (ja) | 2008-11-26 | 2009-11-26 | 溶融混練方法、押出し物及び透明樹脂材 |
EP09829117.2A EP2359999B1 (en) | 2008-11-26 | 2009-11-26 | Melting and kneading method |
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CN200980147178.6A CN102227293B (zh) | 2008-11-26 | 2009-11-26 | 熔融混炼方法、挤出物及透明树脂材料 |
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Also Published As
Publication number | Publication date |
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CN102227293A (zh) | 2011-10-26 |
JPWO2010061872A1 (ja) | 2012-04-26 |
KR20110086836A (ko) | 2011-08-01 |
JP5697143B2 (ja) | 2015-04-08 |
EP2359999A4 (en) | 2013-08-21 |
US8975336B2 (en) | 2015-03-10 |
KR101678239B1 (ko) | 2016-11-21 |
CN102227293B (zh) | 2015-09-02 |
US20110282006A1 (en) | 2011-11-17 |
EP2359999B1 (en) | 2017-01-04 |
EP2359999A1 (en) | 2011-08-24 |
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