JP2008037102A - Resin molding and manufacturing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide propylene resin moldings showing useful rigidity and excellent impact strength as an industrial material for automotive components, appliance components, etc., and a method for manufacturing the propylene resin moldings. <P>SOLUTION: These propylene resin moldings are obtained by a manufacturing method comprising a process to shape a propylene resin containing 5 to 40 mass% polypropylene with 6.0 dl/g or above limiting viscosity, with the help of an injection molding machine etc. and a process to thermally treat the precursor of the moldings at 150 to 170°C. Also the method for manufacturing the propylene resin moldings are provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin molded body made of propylene resin and a method for producing the same. More specifically, the present invention relates to a resin molded body excellent in rigidity and impact strength and a method for producing the same.

Propylene resin moldings are used in many fields as industrial materials such as automobile parts and household appliance parts. For example, in Patent Document 1, for the purpose of improving rigidity, surface hardness, heat resistance and the like, the xylene extraction insoluble part is 99.0% by weight or more, the isotactic pentad fraction is 98% or more, and the isotactic average A propylene-based polymer having a chain length of 500 or more and a total of fractions having an average chain length of 800 or more in each fraction by a column fractionation method of a xylene-insoluble portion of 10 or more is disclosed.
JP-A-7-292202

However, further improvement is required for the rigidity and impact strength of the resin molded body made of propylene resin disclosed in Patent Document 1.
In view of the above problems, an object of the present invention is to provide a resin molded body excellent in rigidity and impact strength and a method for producing the same.

The inventors of the present invention have made the resin molded body rigid by making the propylene resin constituting the resin molded body have a structure in which a plurality of long periods, which are the period of the repeated structure of the crystal part and the amorphous part, are calculated. It was found that the strength could be improved and the present invention was completed.
That is, a resin molded body made of a propylene resin having a crystal part and an amorphous part, and the propylene resin has a plurality of scattering peaks of a scattering profile measured at 155 ° C. to 165 ° C. by the small angle X-ray scattering method. The present invention relates to a resin molded body characterized by having.
Further, the present invention is a method for producing the above resin molded body, wherein a propylene resin containing 5% by mass to 40% by mass of polypropylene having an intrinsic viscosity of 6.0 dl / g or more is shaped to obtain a molded body precursor. The present invention relates to a method for producing a resin molded body comprising a step of producing and a step of heat-treating the molded body precursor at 150 ° C. to 170 ° C.

  ADVANTAGE OF THE INVENTION According to this invention, the resin molding which is excellent in rigidity and impact strength, and its manufacturing method are provided.

[Resin molding]
The resin molded body according to the present invention comprises a propylene resin having a crystal part and an amorphous part and having a plurality of scattering profile peaks measured at 155 ° C. to 165 ° C. by a small angle X-ray scattering method. And
In a resin molded body made of propylene resin having such a profile, a plurality of long periods, which are periods of a repeating structure of crystal parts and non-crystal parts, are calculated. By forming a long-period structure in which both the crystal part and the non-crystal part are thick, it is possible to further improve the rigidity and impact strength of the resin molded body than in the past. The number of peaks in the scattering profile is preferably two. The long period (d) of the crystal structure can be obtained by substituting a wave number (hereinafter referred to as a scattering vector) (q) corresponding to the scattering peak of the scattering profile into an equation of d = 2π / q.
Here, the “crystal part” in the present invention refers to a part present as a crystal in the resin molded body. The “non-crystal part” means a part other than the crystal. The “scattering profile” is the scattering intensity obtained by the small-angle X-ray scattering measurement as described later, as a function of the scattering vector. The “scattering peak” is the above-mentioned scattering profile expressed by a Gaussian function. The peak when approximated.

Here, the scattering profile is at least one scattering peak is present in 0.08 nm ^-1 or 0.15 nm ^-1 less wavenumber range (i) in, and, 0.15 nm ^-1 or 0.30 nm ^- There is at least one scattering peak in the wave number range (ii) of ¹ or less, and among the at least one scattering peak in the wave number range (i), the intensity of the peak having the maximum intensity is expressed as a peak intensity ( 1) and the peak intensity of the peak intensity (1) when the intensity of the peak having the maximum intensity among the at least one scattering peak in the wave number range (ii) is the peak intensity (2). The ratio to (2) is preferably 1-5.
A resin molded body having such a peak strength ratio is more excellent in rigidity and impact strength.
When the strength ratio is less than 1, the impact strength of the resin molded product tends to be insufficient. On the other hand, when the strength ratio exceeds 5, the rigidity tends to be insufficient.

In the present invention, as a small-angle X-ray scattering apparatus, a small-angle X-ray scattering apparatus including an optical system having a spatial resolution of 0.08 nm ⁻¹ , a heating apparatus that heats a resin molded body, and an X-ray detector is used. It is preferred that For example, using a small-angle X-ray scattering measurement system using synchrotron radiation X-rays as described in “Synchrontron Radiation Utilization Technology, Science Forum, pp. 177-183, (1989)” Is preferred.
As a heating device for heating the resin molded body, a heating device having a window through which X-rays pass and capable of increasing the temperature at a temperature increase rate of at least 1 ° C./min is used. A commercially available device may be used as the heating device.
The X-ray detector is an X-ray detector capable of detecting X-ray scattering in units of milliseconds, and is preferably a two-dimensional X-ray CCD detector capable of recording the scattering in two dimensions. A commercially available apparatus may be used as the X-ray detector.

The small-angle X-ray scattering is measured from a room temperature (for example, from 25 ° C.) to a temperature at which the resin molded body melts (for example, 170 ° C.) at a constant heating rate (for example, 1 to 10 ° C./min). To 180 ° C.), the resin molded body is irradiated with X-rays while raising the temperature, and the X-rays scattered from the resin molded body are emitted at a constant temperature interval (for example, at an interval of 1 to 5 ° C.) It is preferable to measure with a line detector.
Then, the measurement result obtained by the measurement method as described above is expressed as a scattering vector (q) defined by the scattering intensity as the vertical axis and the scattering angle or the difference between the incident wave of the X-ray and the wave number vector of the scattered wave. By plotting as a horizontal axis, a scattering profile is obtained. A long period can be calculated from the wave number of the scattering peak position when this scattering profile is approximated by a Gaussian function. The numerical analysis software may be commercially available software.

The measurement temperature for small angle X-ray scattering is preferably 155 ° C. to 165 ° C. When the measurement temperature is lower than 150 ° C., the observation accuracy of the scattering peak existing in the wave number range (i) of 0.08 nm ⁻¹ or more and less than 0.15 nm ⁻¹ may be insufficient. Further, when the measured temperature is higher than 165 ° C. is sometimes observed precision of scattering peaks at 0.15 nm ^-1 or 0.30 nm ^-1 or less in the wavenumber range (ii) in becomes insufficient.

Here, from the viewpoint of preventing thermal deterioration of the resin molded body and the heat conduction speed to the resin molded body, the temperature rising rate during measurement is preferably 1 ° C./min to 10 ° C./min, preferably 5 ° C./min. More preferably, the temperature is from 10 ° C./minute.
From the viewpoint of observation accuracy of the scattering peak, the measurement temperature interval of the small-angle X-ray scattering is preferably 0.1 ° C. to 5 ° C., and more preferably 0.1 ° C. to 1 ° C.

The scattering profile thus obtained has at least one scattering peak in the wave number range (i) of 0.08 nm ⁻¹ or more and less than 0.15 nm ⁻¹ , and 0.15 nm ⁻¹ or more and 0 Each of at least one scattering peak exists in the wave number range (ii) of 30 nm ⁻¹ or less, and the intensity of the peak having the maximum intensity among the at least one scattering peak in the wave number range (i) is When the peak intensity (2) is the peak intensity (1), the peak intensity (2) is the peak intensity (2) of the at least one scattering peak in the wave number range (ii). The ratio with respect to the peak intensity (2) is 1 to 5, preferably 1 to 4.5, and more preferably 1 to 4.
The number of peaks in the wave number ranges (i) and (ii) is preferably one each.

[Method for producing resin molded body]
The method for producing a resin molded body according to the present invention includes a step of producing a molded body precursor (hereinafter also referred to as a molding step) and a step of heat-treating the molded body precursor (hereinafter also referred to as a heat treatment step). Have. This will be described in detail below.

  The molding step is a step of molding a propylene resin containing 5 mass% to 40 mass% of the total amount of polypropylene having an intrinsic viscosity of 6.0 dl / g or more (hereinafter referred to as polypropylene A). By using the propylene resin containing polypropylene A, a plurality of long periods, which are the period of the repeating structure of the crystal part and the non-crystal part of the obtained resin molded body, are calculated. By setting it as such a resin molding, it becomes possible to improve the rigidity and impact strength of a resin molding.

The intrinsic viscosity [η] of polypropylene A is 6.0 dl / g or more, but is preferably 6.5 dl / g or more, preferably 6.7 dl / g or more from the viewpoint of improving mechanical properties, particularly rigidity. It is more preferable that When the intrinsic viscosity is less than 6.0 dl / g, the impact strength of the resin molded product may be insufficient.
Moreover, content of the polypropylene A used for a resin molding is 5 mass%-40 mass% when the whole propylene resin is 100 mass%, and is 7.5 mass%-35.0 mass%. It is preferably 10% by mass to 30% by mass, more preferably 12.5% by mass to 25.0% by mass. When content is less than 5 mass%, the impact strength of a resin molding may become inadequate. Moreover, when content exceeds 40 mass%, the rigidity of a resin molding may fall.

Moreover, it is preferable that a propylene resin further contains the polypropylene (henceforth polypropylene B) whose intrinsic viscosity is 4.5 dl / g or less. By containing polypropylene B, the rigidity and impact strength of the resin molded body can be further improved.
As described above, the intrinsic viscosity of polypropylene B is 4.5 dl / g or less, preferably 4.3 dl / g or less, and more preferably 4.0 dl / g or less. When the intrinsic viscosity is greater than 4.5 dl / g, the impact strength improving effect may be insufficient.
The content of polypropylene B in the propylene resin is 60% by mass to 95% by mass, preferably 65% by mass to 92.5% by mass, based on 100% by mass of the entire propylene resin. More preferably, it is 70 mass%-90 mass%, and it is still more preferable that it is 75 mass%-87.5 mass%.

  The intrinsic viscosity of the entire propylene resin containing polypropylene A and polypropylene B is preferably 2.0 dl / g or more, more preferably 2.5 dl / g or more, and 3.0 dl / g or more. More preferably.

The polypropylene A and the polypropylene B may be a homopolymer or a random polymer of propylene with at least one olefin selected from the group consisting of ethylene and an α-olefin having 4 or more carbon atoms. Among these, a homopolymer is more preferable.
Here, the copolymer of propylene and at least one olefin selected from the group consisting of ethylene and an α-olefin having 4 or more carbon atoms is at least selected from the group consisting of ethylene and an α-olefin having 4 or more carbon atoms. Examples thereof include a propylene random copolymer composed of a kind of olefin and propylene, or a propylene block copolymer containing a propylene homopolymer and a propylene-ethylene random copolymer portion.

From the viewpoint of increasing the rigidity, heat resistance or hardness of the resin molded product, the isotactic pentad fraction of polypropylene A measured by ¹³ C-NMR is preferably 0.94 or more.

The isotactic pentad fraction is defined as A.I. Isotactic linkage (in other words propylene in the molecular chain of polypropylene) measured by the method described by Zambelli et al., Macromolecules, 6, 925 (1973) (ie, using ¹³ C-NMR). This is the fraction of propylene monomer units in the center of a chain of 5 meso-unit monomer units (provided that NMR absorption peaks are assigned based on Macromolecules, 8, 687 (1975)). Specifically, the isotactic pentad fraction is measured as the area fraction of the mmmm peak in the total absorption peak in the methyl carbon region of the ¹³ C-NMR spectrum.

  Molecular weight distribution measured by gel permeation chromatography (GPC) of the entire propylene resin containing polypropylene A and polypropylene B (ratio of weight average molecular weight (Mw) and number average molecular weight (Mn) (Mw / Mn)) ) Is preferably 5.0 to 35.0, more preferably 5.5 to 30.0, and still more preferably 6.0 to 25.0.

As a manufacturing method of the said polypropylene A and polypropylene B, the well-known polymerization method using a polymerization catalyst is mentioned. Examples thereof include a bulk polymerization method, a solution polymerization method, a slurry polymerization method, and a gas phase polymerization method. These polymerization methods may be either batch type or continuous type, and these polymerization methods may be used in combination.
Examples of the polymerization catalyst include a catalyst system comprising (a) a solid catalyst component containing magnesium, titanium, halogen, and an electron donor as essential components, (b) an organoaluminum compound, and (c) an electron donor component. Is mentioned. Examples of the catalyst system include those described in JP-A-1-319508, JP-A-7-216017, JP-A-10-212319, and the like.

  The amount of the solid catalyst component (a), the organoaluminum compound (b) and the electron donor component (c) used in the above polymerization method and the method of supplying each catalyst component to the polymerization tank are determined by the known method of using the catalyst. It may be determined as appropriate.

  The polymerization temperature is usually −30 ° C. to 300 ° C., preferably 20 ° C. to 180 ° C. The polymerization pressure is usually atmospheric pressure to 10 MPa, preferably 0.2 MPa to 5 MPa. Further, for example, hydrogen can be used as a molecular weight adjusting agent in order to adjust the molecular weight and the intrinsic viscosity.

  In the method for producing polypropylene A and polypropylene B, preliminary polymerization may be performed before polymerization (main polymerization). Examples of the prepolymerization method include a method in which a small amount of propylene is supplied in the presence of the solid catalyst component (a) and the organoaluminum compound (b) and polymerization is performed in a slurry state using a solvent.

  In the present invention, polypropylene A and polypropylene B may be produced at a time by polymerizing in two steps. As a method of producing by two-stage polymerization, for example, a method of producing polypropylene A in the former stage and then producing polypropylene B in the latter stage can be mentioned.

  The polypropylene A and the polypropylene B thus obtained are shaped after being melt-kneaded to obtain a propylene resin. Examples of the melt kneading method include a method of melt kneading separately polymerized polypropylene A and polypropylene B with a single screw extruder, a twin screw extruder, a Banbury mixer, a hot roll, or the like. The kneading temperature is usually 170 ° C. to 300 ° C., and the kneading time is usually 1 minute to 20 minutes. Moreover, kneading | mixing of each component may be performed simultaneously and may be performed by dividing | segmenting. When each component is divided and mixed, the kneading order is not particularly limited.

Moreover, the propylene resin may contain resin other than the said polypropylene A and polypropylene B, and various additives as needed.
Examples of resins other than polypropylene A and polypropylene B include elastomers. Examples of the additive include an antioxidant, an ultraviolet absorber, a nucleating agent, an inorganic filler, and an organic filler.

  In general, injection molding is used for shaping the propylene resin. An injection molding machine having an injection machine and a mold is used for the injection molding, and the propylene resin is substantially melted in the injection machine and filled into the mold cavity with a predetermined injection pressure.

  In the molding step, in order to obtain a resin molded body excellent in rigidity and impact strength, the propylene resin injected into the mold cavity may be pressurized and held (held) with a predetermined pressure. By maintaining the pressure, the degree of orientation of the molecular chains of the polymer constituting the propylene resin is increased, and it is possible to form a long-period structure in which both the crystal part and the amorphous part are thick. As a result, it is possible to obtain a resin molded body having more excellent rigidity and impact resistance.

The pressure during holding varies depending on the size of the mold cavity, but is preferably 15% or more, more preferably 20% or more, and more preferably 30% or more of the maximum injection pressure P of the injection molding machine. Most preferred.
The pressure holding time is preferably 0.5 second to 60 seconds, and more preferably 1 second to 50 seconds. The mold temperature during holding is preferably 10 ° C to 70 ° C, more preferably 20 ° C to 60 ° C.
The method for measuring the pressure at the time of holding pressure varies depending on the shape of the desired resin molded body, but is generally measured using a pressure gauge provided in the injection molding machine.

  The molded body precursor obtained by such a method becomes a resin molded body through a heat treatment step in which heat treatment is performed at 150 ° C to 170 ° C. By performing the heat treatment step, a crystal structure having a sufficiently long long-period structure in which both the crystal part and the amorphous part of the propylene resin in the resin molded body are sufficiently thick, that is, the peak intensity in the above-described scattering profile ( The ratio of 1) to the peak intensity (2) can be 1 or more. This makes it possible to improve the rigidity and impact strength of the obtained resin molded body in a shorter time.

  The heat treatment temperature in the heat treatment step is 150 ° C to 170 ° C, preferably 150 ° C to 165 ° C, and more preferably 150 ° C to 160 ° C. The heat treatment time is preferably 10 minutes to 400 hours, more preferably 10 minutes to 300 hours, and even more preferably 10 minutes to 200 hours.

By setting the heat treatment temperature to 150 ° C. or higher, it is possible to further improve mechanical properties, particularly rigidity. Moreover, it becomes possible to stabilize the shape of a resin molding by setting heat processing temperature to 170 degrees C or less.
And by making the heat treatment time longer than 10 minutes, it is possible to improve mechanical properties, particularly impact strength. Moreover, by making the heat treatment time shorter than 400 hours, it is possible to prevent the propylene resin from being decomposed and to impart sufficient mechanical properties.

  As the heat treatment method, for example, (1) a method of heating the mold to 150 ° C. to 170 ° C. without taking out the molded body precursor from the mold for producing the molded body precursor, and (2) a molded body precursor A method of contacting a roll surface or a hot plate surface held at 150 ° C. to 170 ° C., and (3) a method of placing a molded body precursor in an oven filled with a gas of 150 ° C. to 170 ° C. such as nitrogen, argon, air, etc. (4) A method of immersing the molded body precursor in a bath filled with an inert liquid such as silicon oil or water at 150 ° C to 170 ° C.

Hereinafter, the present invention will be further described with reference to examples and comparative examples, but the scope of the present invention is not limited thereto.
The propylene resin used in the present invention or the physical property measuring method and the production method of the resin molded body of the present invention are shown below.

(1) Intrinsic viscosity ([η], unit: dl / g)
Using an Ubbelohde viscometer, tetralin was used as a solvent, and the reduced viscosity was measured at 135 ° C. at three points of concentrations of 0.1 g / dl, 0.2 g / dl and 0.5 g / dl. The intrinsic viscosity is calculated by the calculation method described in “Polymer Solution, Polymer Experiments 11” (published by Kyoritsu Shuppan Co., Ltd.), page 491. That is, the reduced viscosity is plotted against the concentration, and the concentration is extrapolated to zero. Obtained by extrapolation.

(2) Flexural modulus (unit: MPa)
The bending elastic modulus at 23 ° C. was measured using a 3.2 mm-thick test piece molded by injection molding in accordance with ASTM D790.

(3) Izod impact strength (unit: kJ / m ² )
In accordance with JIS-K-7110, an Izod impact strength at 23 ° C. was measured using a 3.2 mm thick test piece molded by injection molding and notched after molding.

(4) Configuration of small-angle X-ray scattering measurement (4-1) Configuration of small-angle X-ray scattering measurement device The optical system of the small-angle X-ray scattering measurement device includes a heating device and a vacuum path for the resin molding from the upstream on the optical axis. A two-dimensional X-ray CCD detector is installed. As the heating device, a heating shear flow field application unit (CSS-450NV) for small-angle X-ray scattering device of Japan High-Tech Co., Ltd. was used. The two-dimensional X-ray CCD detector uses the air-cooled two-dimensional X-ray CCD detector (C7300) and image intensifier of Hamamatsu Photonics Co., Ltd. A 10 mmφ lead beam stop was placed on the optical axis.

(4-2) Conditions for small-angle X-ray scattering measurement The resin molded body is set in a heating device so as to be installed for Through View measurement, and the resin molded body is completely removed at a heating rate of 10 ° C./min. While raising the temperature until melting, small-angle X-ray scattering from the resin molding was measured every 6 seconds with an exposure time of 76 ms.

(4-3) Analysis of small-angle X-ray scattering data For the scattering intensity of small-angle X-ray scattering detected by a two-dimensional X-ray CCD detector, use software (trade name: Hi-pic 6.3) attached to the detector. And analyzed. First, the background was obtained by measuring the small-angle X-ray scattering of only the heating shear flow field application unit for the small-angle X-ray scattering device without installing the resin molding. Next, the resin molding was installed in the unit, and scattering of small angle X-rays of the resin molding installed in the unit was measured. Then, a process of subtracting the background from the measured small-angle X-ray scattering was performed. Furthermore, the scattering vector (q) at an arbitrary point on the two-dimensional image is determined from a small-angle scattered image of collagen with a known scattering angle, the scattering intensity in the flow direction of the resin molding is plotted on the vertical axis, and the scattering vector is plotted on the horizontal axis As a scattering profile.

The long period in the resin molded body was calculated by the following procedure using numerical analysis software (trade name: KaleidaGraph 4.0).
First, in the process of the resin molded body is heated at a 10 ° C. / minute rate, scatter less vector 0.08 nm ^-1 or 0.15 nm ^-1 and the scattering vector 0.15 nm ^-1 or 0.30 nm ^-1 or less of maximum value of the intensity of the scattered peak in the range is observed, respectively, and the scattering profile at 160 ° C. to 161 ° C. scattering intensity in the range of less than the scattering vector 0.08 nm ^-1 or 0.15 nm ^-1 is maximized On the other hand, the scattering profile was approximated using the following Gaussian function to determine the scattering profile parameters (m1 to m6).
y = m1 + m2 × exp {− ((x−m3) / m4) ² } + m5 × exp {− ((x−m6) / m4) ² }

Here, m1 is a constant, parameter m3 is the wave number range (i) scattering vector corresponding to (0.08 nm ^-1 or 0.15nm less than ^-1) (q), the parameter m6 is the wave number range ( ii) (a scattering vector corresponding to 0.15 nm ^-1 or 0.30 nm ^-1 or less). Parameters m2 and m5 are peak intensity (1) and peak intensity (2), and parameter m4 is a half-value width of a Gaussian function.
The long period (d) was determined from the values of m3 and m6 using the formula d = 2π / q. The intensity ratio (peak intensity (1) / peak intensity (2)) was determined using the peak intensity (1) and peak intensity (2) values (m2 and m5) of the scattering peak.

(5) Propylene resin production method Propylene resin was produced using a catalyst described in JP-A-10-212319. The following propylene-ethylene copolymer (PP-1) and propylene homopolymer (PP-2) were used.
PP-1: A propylene-ethylene copolymer having an intrinsic viscosity of 2.9 dl / g, containing 0.3 wt% of ethylene, and an isotactic pentad fraction of 0.965.
PP-2: A propylene homopolymer having an intrinsic viscosity of 7.0 dl / g.

(6) Heat treatment method Heat treatment is performed by placing a test piece in a stainless steel container 20 cm wide, 20 cm wide and 2 cm high in a gear oven, 22 cm long, 22 cm wide, and 0.5 cm thick stainless steel. The test was carried out after covering with a plate made of steel.

[Example 1]
A mixture of 90 parts by weight of PP-1 and 10 parts by weight of PP-2 was melt-kneaded with a single screw extruder having an inner diameter of 40 mm to obtain a propylene resin in the form of pellets. A test piece was molded from this propylene resin by using an injection molding machine (IS100EN manufactured by Toshiba Machine Co., Ltd.) at a cylinder temperature of 260 ° C. and a holding pressure of 33% of the maximum injection pressure P of the injection molding machine. The test piece was heat-treated under the conditions shown in Table 1 using a gear oven. Using the test piece after heat treatment, the flexural modulus and Izod impact strength were measured. These results are shown in Table 1.
Moreover, parameters m1 to m6, long period, maximum intensity, and intensity ratio were obtained by creating a scattering profile from the measurement of small-angle X-ray scattering and approximating it with a Gaussian function. The scattering profile is shown in FIG. 1, and the analysis result of the scattering profile is shown in Table 2 and FIG.

[Example 2]
A propylene resin prepared by mixing 70 parts by weight of PP-1 and 30 parts by weight of PP-2 was injection molded and subjected to the same operation as in Example 1 except that heat treatment was performed under the conditions shown in Table 1. went. The results of the flexural modulus and Izod impact strength are shown in Table 1. The scattering profile is shown in FIG. 3, and the analysis results of the scattering profile are shown in Table 2 and FIG.

[Comparative Example 1]
A propylene resin prepared by mixing 90 parts by weight of PP-1 and 10 parts by weight of PP-2 was injection-molded and subjected to the same operation as in Example 1 except that heat treatment was performed under the conditions shown in Table 1. went. The results of the flexural modulus and Izod impact strength are shown in Table 1. The scattering profile is shown in FIG. 5, and the analysis results of the scattering profile are shown in Table 2 and FIG.

[Comparative Example 2]
A propylene resin prepared by mixing 70 parts by weight of PP-1 and 30 parts by weight of PP-2 was injection molded and subjected to the same operation as in Example 1 except that heat treatment was performed under the conditions shown in Table 1. went. The results of the flexural modulus and Izod impact strength are shown in Table 1. The scattering profile is shown in FIG. 7, and the analysis results of the scattering profile are shown in Table 2 and FIG.

[Comparative Example 3]
The same operation as in Example 1 was performed except that injection molding was performed using only PP-1 and heat treatment was performed under the conditions described in Table 1. The results of the flexural modulus and Izod impact strength are shown in Table 1. The scattering profile is shown in FIG. 9, and the analysis results of the scattering profile are shown in Table 2 and FIG.

[Comparative Example 4]
The same procedure as in Example 1 was performed except that the injection molding was performed using only PP-1 and the heat treatment was performed under the conditions shown in Table 1. The results of the flexural modulus and Izod impact strength are shown in Table 1. The scattering profile is shown in FIG. 11, and the analysis results of the scattering profile are shown in Table 2 and FIG.

It is a small angle X-ray-scattering profile in 160 degreeC obtained using the test piece of Example 1 of this invention. It is the figure which showed the analysis result of the small angle X-ray-scattering profile in 160 degreeC obtained using the test piece of Example 1 of this invention. It is a small angle X-ray-scattering profile in 160 degreeC obtained using the test piece of Example 2 of this invention. It is the figure which showed the analysis result of the small angle X-ray-scattering profile in 160 degreeC obtained using the test piece of Example 2 of this invention. 2 is a small angle X-ray scattering profile at 160 ° C. obtained using the test piece of Comparative Example 1. It is the figure which showed the analysis result of the small angle X-ray-scattering profile in 160 degreeC obtained using the test piece of the comparative example 1. 3 is a small angle X-ray scattering profile at 160 ° C. obtained using the test piece of Comparative Example 2. It is the figure which showed the analysis result of the small angle X-ray-scattering profile in 160 degreeC obtained using the test piece of the comparative example 2. 6 is a small angle X-ray scattering profile at 161 ° C. obtained using the test piece of Comparative Example 3. It is the figure which showed the analysis result of the small angle X-ray-scattering profile in 161 degreeC obtained using the test piece of the comparative example 3. FIG. It is a small angle X-ray-scattering profile in 161 degreeC obtained using the test piece of the comparative example 4. It is the figure which showed the analysis result of the small angle X-ray-scattering profile in 161 degreeC obtained using the test piece of the comparative example 4.

Claims (5)

A resin molded body made of a propylene resin having a crystal part and an amorphous part,
The propylene resin has a plurality of scattering peaks of a scattering profile measured at 155 ° C. to 165 ° C. by the small angle X-ray scattering method. Wherein the scattering profile, and at least one scattering peak is present in 0.08 nm ^-1 or 0.15 nm ^-1 less wavenumber range (i) in, and, 0.15 nm ^-1 or 0.30 nm ^-1 or less of Each has at least one scattering peak in the wavenumber range (ii);
Of the at least one scattering peak in the wave number range (i), the peak intensity having the maximum intensity is defined as peak intensity (1),
Of the at least one scattering peak in the wave number range (ii), the peak intensity (2) of the peak intensity (1) when the intensity of the peak having the maximum intensity is defined as the peak intensity (2). The resin molded body according to claim 1, wherein a ratio to the ratio is 1 to 5.   The resin molded product according to claim 1 or 2, wherein the propylene resin contains 5 mass% to 40 mass% of polypropylene having an intrinsic viscosity of 6.0 dl / g or more based on the total amount of the propylene resin.   4. The resin molded product according to claim 3, wherein the propylene resin further contains polypropylene having an intrinsic viscosity of 4.5 dl / g or less in an amount of 60 mass% to 95 mass% of the total amount of the propylene resin. A method for producing a resin molded body comprising the propylene resin according to any one of claims 1 to 4,
A step of producing a molded body precursor by shaping a propylene resin containing 5 mass% to 40 mass% of polypropylene having an intrinsic viscosity of 6.0 dl / g or more;
Heat treating the molded body precursor at 150 ° C. to 170 ° C .;
The manufacturing method of the resin molding characterized by having.

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