Resin compositions, molded articles, and building materials

Abstract

This invention provides a resin composition that, when an inorganic filler such as regolith is blended into a thermoplastic resin, can produce a molded article with excellent mechanical strength, such as fracture stress. [Solution] A resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), wherein the difference in HSP values ​​between the thermoplastic resin (A) and the inorganic filler (B) is 0.1 to 11.0, the inorganic filler (B) contains SiO2, and the content ratio of the inorganic filler (B) is 50% by mass or less of the total amount of the resin composition. A resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), wherein the thermoplastic resin (A) contains a polyvinyl alcohol-based resin, the inorganic filler (B) contains SiO2, and the content ratio of the inorganic filler (B) is 50% by mass or less of the total amount of the resin composition.

Description

[Technical Field]

[0001] This invention relates to a resin composition comprising a thermoplastic resin and an inorganic filler. More specifically, it relates to a thermoplastic resin composition in which the reduction in elongation at break is suppressed and the breaking stress is greatly increased by incorporating an inorganic filler. The present invention also relates to molded articles and building materials using this resin composition. [Background technology]

[0002] Numerous technologies have been studied to enhance the mechanical strength of thermoplastic resins by incorporating inorganic fillers. For example, Patent Document 1 proposes a polycarbonate resin composition in which an inorganic filler is blended with the polycarbonate resin to improve rigidity and other properties.

[0003] On the other hand, in recent years, space development programs have been actively pursued, and research is also progressing on the effective utilization of lunar resources. For example, Patent Document 2 proposes a method for manufacturing building materials, in which regolith is kneaded with a curable resin, the mixture of regolith and curable resin is poured into a mold and cured in a lunar environment, then a photosensitive resin is applied to the surface, and the photosensitive resin is cured by irradiating it with light in a lunar environment to form block-shaped building materials.

[0004] Regolith is sediment deposited on the lunar surface, consisting of aggregates of particles with a median particle size of 70 μm and a maximum particle size of approximately 2 mm. Its composition has been determined from samples brought back by Apollo 11 and other missions, and as shown in Table 1 below, it contains a higher proportion of iron oxide, calcium oxide, magnesium oxide, and titanium oxide compared to minerals on Earth. Furthermore, a regolith simulant (a simulated lunar surface soil) has been developed using Earth's mineral resources based on the composition of regolith, and as shown in Table 1 below, it contains slightly less than 5% iron(III) oxide (Fe2O3), which is not found in regolith.

[0005] [Table 1]

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] As described above, conventionally, blends of thermosetting resins and wollastonite have been proposed, but blends of thermoplastic resins and wollastonite have not been studied.

[0008] While thermosetting resins have advantages over thermoplastic resins in terms of heat resistance, mechanical strength, and chemical resistance, they are inferior in toughness, require a long time for molding, have a large number of molding steps, and it is difficult to obtain a molded body with a complex shape, and there are disadvantages such as high molding costs. Therefore, from the perspective of industrial practical application, it is desirable to apply wollastonite to thermoplastic resins rather than thermosetting resins. However, according to the studies of the present inventors, when wollastonite is blended with a polycarbonate resin, which is a typical thermoplastic resin (hereinafter, may be abbreviated as "PC"), the resulting molded body has a lower breaking stress and elongation at break than in the case of only the polycarbonate resin, and it has been found that pelletization and molding become difficult depending on the blending amount.

[0009] An object of the present invention is to provide a resin composition capable of realizing a molded body excellent in mechanical strength such as breaking stress by blending an inorganic filler such as wollastonite with a thermoplastic resin. Another object of the present invention is to provide a molded body and a building material made of this resin composition.

Means for Solving the Problems

[0010] As a result of repeated studies to solve the above problems, the inventors of the present invention have found that by using a specific thermoplastic resin and blending an inorganic filler such as wollastonite, it is possible to suppress a decrease in elongation at break and increase the breaking stress, thereby obtaining a molded article and a building material having excellent mechanical strength. That is, the gist of the present invention is as follows.

[0011] [1] A resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), where the difference in H between the thermoplastic resin (A) and the inorganic filler (B) is from 0.1 to 11.0, where the inorganic filler (B) contains SiO2, and where the content ratio of the inorganic filler (B) is 50% by mass or less based on the total amount of the resin composition.

[0012] [2] The resin composition according to claim 1, wherein the HSP value (δ D , δ P , δ H ) of the inorganic filler (B) satisfies the following conditions. 15.0 ≤ δ D ≤ 20.0 15.0 ≤ δ P ≤ 20.0 10.0 ≤ δ H ≤ 15.0

[0013] [3] A resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), where the thermoplastic resin (A) contains a polyvinyl alcohol-based resin, where the inorganic filler (B) contains SiO2, and where the content ratio of the inorganic filler (B) is 50% by mass or less based on the total amount of the resin composition.

[0014] [4] The resin composition according to any one of [1] to [3], wherein the thermoplastic resin (A) contains an ethylene-vinyl alcohol copolymer.

[0015] [5] The resin composition according to [4], wherein the content of ethylene structural units in the ethylene-vinyl alcohol copolymer is 20 to 60 mol%.

[0016] [6] The resin composition according to any one of [1] to [5], wherein the SiO2 content is 20 to 60% by mass relative to the total amount of inorganic filler (B).

[0017] [7] The resin composition according to any one of [1] to [6], further comprising Al2O3 as the inorganic filler (B).

[0018] [8] The resin composition according to [7], wherein the Al2O3 content is 10 to 50% by mass relative to the total amount of inorganic filler (B).

[0019] [9] The resin composition according to any one of [1] to [8], wherein the inorganic filler (B) is regolith.

[0020]

[10] A molded article obtained by molding any of the resin compositions described in [1] to [9].

[0021]

[11] A building material obtained by molding a resin composition described in any of [1] to [9]. [Effects of the Invention]

[0022] The resin composition of the present invention is a thermoplastic resin composition in which mechanical strength is enhanced by the incorporation of inorganic fillers, and the thermoplastic resin composition of the present invention can provide molded articles and building materials with excellent mechanical strength, such as fracture stress.

[0023] The resin composition of the present invention makes it possible to effectively utilize regolith and its imitations, which have recently attracted attention for their expanded applications in lunar resource utilization, to provide practical building materials, and thus has extremely high industrial value. [Modes for carrying out the invention]

[0024] The embodiments of the present invention will be described in detail below, but the present invention is not limited to the following description and can be modified and implemented as appropriate without departing from the spirit of the invention. Furthermore, in this specification, when "~" is used to enclose numerical values ​​or physical properties, it shall be used to include the values ​​before and after it. Furthermore, in this specification, “mass%” and “parts by mass” are synonymous with “weight%” and “parts by weight.”

[0025] [Resin composition] A resin composition according to one embodiment of the present invention (hereinafter sometimes referred to as "resin composition I") is a resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), wherein the difference in HSP values ​​between the thermoplastic resin (A) and the inorganic filler (B) is 0.1 to 11.0, the inorganic filler (B) contains SiO2, and the content ratio of the inorganic filler (B) is 50% by mass or less of the total amount of the resin composition. A resin composition according to another embodiment of the present invention (hereinafter sometimes referred to as "Resin Composition II") is a resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), wherein the thermoplastic resin (A) comprises a polyvinyl alcohol-based resin, the inorganic filler (B) comprises SiO2, and the content ratio of the inorganic filler (B) is 50% by mass or less of the total amount of the resin composition.

[0026] Hereinafter, "Resin Composition I" and "Resin Composition II" will be collectively referred to as "the resin compositions of the present invention."

[0027] <Thermoplastic resin (A)> (Thermoplastic resin (A) of resin composition I) In resin composition I, there are no particular restrictions on the type of thermoplastic resin (A) used, but a thermoplastic resin (A) is used in which the difference in HSP value between it and the inorganic filler (B) is in the range of 0.1 to 11.0.

[0028] The HSP value is defined as the dispersion force term (δ D ), polar force term (δP ) is the Hansen solubility parameter that considers the polarity of substances by dividing it into three components of the hydrogen bonding term (δ H ). In the case of multiple components, it can be the sum of values according to the component ratio. In the present invention, the difference in HSP values (ΔHSP) is represented by the following formula. Here, for the two components of the thermoplastic resin (A) and the inorganic filler (B), each term is δ DA , δ PA , δ HA and δ DB , δ PB , δ HB and is represented by. ΔHSP = {4(δ DA - δ DB ) 2 + (δ PA - δ PB ) 2 + (δ HA - δ HB ) 2} 1 / 2

[0029] Those with a small difference have compatibility, and as this difference increases, the compatibility decreases and phase separation is likely to occur.

[0030] If the difference in HSP values between the thermoplastic resin (A) and the inorganic filler (B) in the resin composition I is 11.0 or less, phase separation is unlikely to occur, the adhesive force at the interface between the thermoplastic resin (A) and the inorganic filler (B) is also high, and there is a tendency to increase the mechanical strength. On the other hand, due to the difference in the composition of the thermoplastic resin (A) which is an organic substance and the inorganic filler (B) which is an inorganic substance, the difference in HSP values is usually 0.1 or more. From the above, the difference in HSP values between the thermoplastic resin (A) and the inorganic filler (B) is preferably 0.1 to 11.0, and more preferably 0.1 to 5.0.

[0031] In the present invention, the HSP values (δ D , δ P , δ H ) of the inorganic filler (B) preferably satisfy the following conditions. 15.0 ≦ δ D ≦ 20.0 15.0 ≦ δ P≤20.0 10.0 ≤ δ H ≤15.0 In particular, the HSP value (δ) of the regolith described later, which is preferably used as an inorganic filler (B), is D , δ P , δ H The values ​​are approximately (18, 16, 13), and therefore, in resin composition I, a thermoplastic resin (A) in which the difference in HSP value from this value is within the above range is preferably used.

[0032] Examples of thermoplastic resins (A) whose HSP value difference with respect to inorganic filler (B) falls within the above range include polyvinyl alcohol-based resins described later, particularly preferably ethylene-vinyl alcohol copolymers. Ethylene-vinyl alcohol copolymers are usually obtained by copolymerizing vinyl ester monomers in the presence of ethylene and a polymerization initiator, and then saponifying the mixture. It is preferable that the ethylene-vinyl alcohol copolymer is the one described later as thermoplastic resin (A) in resin composition II.

[0033] As described later for the thermoplastic resin (A) of resin composition II, the thermoplastic resin (A) may consist of one type of thermoplastic resin or may contain two or more types of thermoplastic resins. If the thermoplastic resin (A) consists of two or more types of thermoplastic resins, the difference in HSP value between the thermoplastic resin (A) as a mixture and the inorganic filler (B) should be within the above range.

[0034] (Thermoplastic resin (A) of resin composition II) The thermoplastic resin (A) in resin composition II contains a polyvinyl alcohol-based resin as an essential component. The thermoplastic resin (A) in resin composition II only needs to contain a polyvinyl alcohol-based resin as an essential component, and may contain one or more thermoplastic resins other than polyvinyl alcohol-based resins as long as the objectives of the present invention are not impaired.

[0035] In resin composition II, the thermoplastic resin (A) contains a polyvinyl alcohol-based resin, and in order to effectively obtain the effects of the present invention, namely the effect of improving mechanical strength by blending with the inorganic filler (B), it is preferable that the thermoplastic resin (A) contains 50% by mass or more of the polyvinyl alcohol-based resin, more preferably 70% by mass or more, and even more preferably 80-100% by mass.

[0036] Examples of polyvinyl alcohol-based resins to be used include polyvinyl alcohol resin, modified polyvinyl alcohol resin obtained by modifying polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer, and modified ethylene-vinyl alcohol copolymer obtained by modifying ethylene-vinyl alcohol copolymer. These polyvinyl alcohol-based resins may be used individually or in combination of two or more types.

[0037] Polyvinyl alcohol resin can be obtained by saponifying the acetate group of polyvinyl acetate, which is a polymer of vinyl acetate. Examples of modified polyvinyl alcohol resins include butenediol-modified, silanol-modified, or acetoacetyl-modified polyvinyl alcohol resins.

[0038] The content of ethylene structural units in the ethylene-vinyl alcohol copolymer is preferably 20 to 60 mol%, more preferably 25 to 50 mol%, and particularly preferably 25 to 35 mol%. When the content is above the lower limit, the product tends to exhibit excellent gas barrier properties and melt moldability under high humidity conditions. On the other hand, when the content is below the upper limit, the product tends to exhibit excellent gas barrier properties. In this embodiment, the ethylene structural unit content of the ethylene-vinyl alcohol copolymer refers to the value measured according to ISO 14663.

[0039] The degree of saponification of the ethylene-vinyl alcohol copolymer is preferably 90 to 100 mol%, more preferably 95 to 100 mol%, and even more preferably 99 to 100 mol%. When the degree of saponification is above the lower limit, it tends to exhibit excellent gas barrier properties, thermal stability, moisture resistance, etc. The degree of saponification of such ethylene-vinyl alcohol copolymer can be measured according to JIS K6726 (provided that the ethylene-vinyl alcohol copolymer is used as a solution uniformly dissolved in water / methanol solvent).

[0040] The melt flow rate (MFR) (2160g load at 210°C) of the ethylene-vinyl alcohol copolymer is preferably 0.5 to 100 g / 10 min, more preferably 1 to 50 g / 10 min, and even more preferably 3 to 35 g / 10 min. When the MFR is below the upper limit, the film tends to have excellent stability during film formation, and when it is above the lower limit, it tends to have an appropriate viscosity and excellent melt extrusion properties. The aforementioned MFR is an indicator of the degree of polymerization of the ethylene-vinyl alcohol copolymer, and can be adjusted by the amount of polymerization initiator and solvent used when copolymerizing ethylene and vinyl ester.

[0041] Furthermore, polyvinyl alcohol-based resins such as ethylene-vinyl alcohol copolymers typically have a density of 1.05 to 1.30 g / cm³ as measured by the dry density method (23°C). 3 Particularly preferred is 1.14 to 1.21 g / cm³. 3 The MFR (Melting Frequency Rating) measured by a melt indexer (at 210°C, 2160g load) is typically 1 to 50g / 10 min, particularly preferably 3 to 12g / 10 min, and the melting point measured by DSC method at a heating and cooling rate of 10°C / min is typically 120 to 210°C, particularly preferably 140 to 185°C. If the density of the polyvinyl alcohol-based resin, such as ethylene-vinyl alcohol copolymer, is above the lower limit, the resulting molded article tends to have excellent flexibility and heat resistance. If the density is below the upper limit, the resulting molded article tends to have excellent toughness and a suitable melting point, making it easy to melt mold. If the MFR of a polyvinyl alcohol-based resin such as an ethylene-vinyl alcohol copolymer is above the lower limit, the resin itself tends to have excellent fluidity and is easy to mix with inorganic filler (B). If it is below the upper limit, it tends to have excellent heat resistance and the resulting molded article tends to have excellent strength. If the melting point of a polyvinyl alcohol-based resin, such as an ethylene-vinyl alcohol copolymer, is above the lower limit, it tends to have excellent heat resistance and the resulting molded article has excellent strength. If the melting point is below the upper limit, the resulting molded article tends to have excellent toughness and is easy to melt mold.

[0042] Polyvinyl alcohol-based resins such as ethylene-vinyl alcohol copolymers may be used alone, or two or more resins with different resin types, modification status, and physical properties may be mixed and used.

[0043] <Inorganic filler (B)> The inorganic filler (B) used in the present invention may contain SiO2, and is not particularly limited, but a filler containing SiO2 and further containing Al2O3 is preferred from the viewpoint of compatibility with the thermoplastic resin (A) and uniform dispersion.

[0044] As the inorganic filler (B), two or more different inorganic fillers (B) may be mixed and used, but the SiO2 content is preferably 20 to 60% by mass, and more preferably 40 to 60% by mass, relative to the total amount of inorganic filler (B). If the SiO2 content is above the lower limit, it tends to have excellent compatibility with the thermoplastic resin (A), and if it is below the upper limit, the resin composition itself tends to have excellent brittleness and is less likely to become brittle.

[0045] Furthermore, the Al2O3 content relative to the total amount of inorganic filler (B) is preferably 10 to 50% by mass, and more preferably 20 to 30% by mass. If the Al2O3 content is above the lower limit, it tends to have excellent compatibility with thermoplastic resin (A), and if it is below the upper limit, the resin composition itself tends to have excellent brittleness and is less prone to becoming brittle.

[0046] Examples of such inorganic fillers (B) include red clay, acidic clay, and basalt, but in the present invention, it is preferable to use regolith from the viewpoint of effective utilization of lunar resources. In this invention, regolith refers to a broader term encompassing not only lunar soil but also lunar soil simulants (regolith-like products) such as the aforementioned regolith simulant.

[0047] In the present invention, the inorganic filler (B) may be one of the inorganic fillers described above, or two or more may be mixed, as long as the preferred SiO2 and Al2O3 content ratios described above are met. From the perspective of utilizing lunar resources, it is preferable that the inorganic filler (B) contains 30% by mass or more, and particularly 50-100% by mass, of regolith.

[0048] <Content ratio of inorganic filler (B)> In the resin composition of the present invention, the content of inorganic filler (B) is 50% by mass or less of the total amount of the resin composition. If the content of inorganic filler (B) is 50% by mass or less, it is possible to suppress the decrease in elongation at break caused by the incorporation of inorganic filler (B), increase the mechanical strength such as the breaking stress, and obtain a practical molded article. On the other hand, if the content of inorganic filler (B) is too low, the effect of improving the mechanical strength due to the incorporation of inorganic filler (B) cannot be sufficiently obtained, so the lower limit of the content of inorganic filler (B) is preferably 10% by mass or more of the total amount of the resin composition. From the viewpoint of balancing the suppression of the decrease in elongation at break with the improvement of mechanical strength such as fracture stress, the content of inorganic filler (B) is preferably 20 to 50% by mass, and particularly 30 to 40% by mass, based on the total amount of the resin composition.

[0049] <Other ingredients> The resin composition of the present invention may contain other components besides the thermoplastic resin (A) and inorganic filler (B), as long as they do not impair the purpose of the present invention. Other components that the resin composition of the present invention may contain include plasticizers (such as triacetin), lubricants, antistatic agents, antioxidants, light stabilizers, ultraviolet absorbers, dyes, pigments, hydrolysis inhibitors, nucleating agents, antiblocking agents, lightfastness agents, heat stabilizers, flame retardants, mold release agents, antifogging agents, surface wetting improvers, dispersion aids, various surfactants, slip agents, and other additives, as well as fillers other than inorganic filler (B). These can be arbitrarily blended as long as they do not impair the effects of the present invention, and one type may be used alone, or two or more types may be used in combination.

[0050] The content of these other components is usually preferably such that the total amount of components mixed is 30% by mass or less, for example, 0.05 to 20% by mass, relative to the total amount of the resin composition of the present invention, in order not to impair the physical properties of the resin composition of the present invention.

[0051] <Method for producing resin compositions> The resin composition of the present invention is produced by mixing a thermoplastic resin (A) and an inorganic filler (B) with other components as needed.

[0052] This mixing process involves mixing the thermoplastic resin (A) and inorganic filler (B), along with other components as needed, simultaneously or in any order in predetermined proportions using a mixer such as a tumbler, V-type blender, Nauter mixer, Banbury mixer, kneading roll, or extruder, preferably by melt kneading. While either a twin-screw extruder or a single-screw extruder may be used, a twin-screw extruder is more preferable for achieving good melt kneading depending on the properties of the thermoplastic resin (A) and inorganic filler (B).

[0053] The temperature during melt mixing is preferably 150 to 230°C, and more preferably 190 to 220°C. Within this temperature range, the time required for the melt reaction can be shortened, deterioration of color due to resin degradation can be prevented, and the physical properties in practical applications can be further improved. Furthermore, regarding the melting and kneading time, from the viewpoint of more reliably avoiding resin degradation as described above, unnecessary lengthening should be avoided. Preferably, it should be 20 seconds to 15 minutes, and more preferably 30 seconds to 10 minutes. It is preferable to set the melting and kneading temperature and time conditions to satisfy this.

[0054] [Molded body] The molded articles of the present invention are obtained by molding the resin composition of the present invention. Examples of molding methods include compression molding (compression molding, lamination molding, stampable molding), injection molding, extrusion molding and co-extrusion molding (film molding, lamination molding, pipe molding, wire / cable molding, profile molding by inflation method and T-die method), hot press molding, hollow molding (various blow molding), calendering, solid molding (uniaxial stretching, biaxial stretching, roll rolling, stretch-oriented nonwoven fabric molding, thermoforming (vacuum forming, pressure forming), plastic processing, powder molding (rotational molding), and various nonwoven fabric molding (dry method, adhesive method, entanglement method, spunbond method, etc.). In particular, injection molding, extrusion molding, compression molding, or hot press molding are preferred methods. Specific shapes of molded articles include plate-like, sheet-like, film-like, pellet-like, fibrous, hollow cylindrical, and various injection-molded forms.

[0055] Furthermore, molded articles of the present invention, which are formed by molding the resin composition of the present invention, can be subjected to various secondary processing for the purpose of imparting surface functions such as chemical functions, electrical functions, magnetic functions, mechanical functions, friction / wear / lubrication functions, optical functions, and thermal functions. Examples of secondary processing include embossing, painting, bonding, printing, metallizing (plating, etc.), machining, and surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, coating, etc.).

[0056] The molded articles of the present invention, made from the resin composition of the present invention, can be applied to various fields such as building materials, automotive interior materials, furniture, and various enclosures, but are particularly useful for building material applications due to their excellent mechanical strength, such as fracture stress.

[0057] [Building materials] The building material of the present invention is obtained by molding the resin composition of the present invention, and corresponds to the molded article of the present invention described above. The building materials of the present invention can be applied to various parts of houses or facilities on the lunar surface, such as walls, ceilings, floors, doors, etc. [Examples]

[0058] The specific embodiments of the present invention will be described in more detail below using examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention. The various manufacturing conditions and evaluation result values ​​in the following embodiments represent preferred upper or lower limits in the embodiments of the present invention, and the preferred range may be defined by a combination of the aforementioned upper or lower limits and the values ​​of the following embodiments or between embodiments.

[0059] [Raw materials used] The details of the raw materials used in the following examples and comparative examples are as follows.

[0060] <Thermoplastic resin (A)> Ethylene-vinyl alcohol copolymer: EVOH pellets "Soanol A4412B" manufactured by Mitsubishi Chemical Corporation (Density: 1.14 g / cm³) 3 MFR = 12.0 g / 10 min (210°C), Melting point: 164°C, Ethylene structural unit content: 44 mol%, Degree of saponification: 99.7 mol%, HSP values: (18.4, 14.1, 8.9), Difference in HSP value from regolith: 4.8) Polycarbonate resin: PC pellets "XANTAR7022J" manufactured by Mitsubishi Chemical Corporation (density: 1.21 g / cm³) 3 MVR=14cm 3(10 minutes at 300°C, HSP values: (19.5, 9.2, 4.1), HSP value difference from regolith: 11.7)

[0061] <Inorganic filler (B)> Regolith: Tegara's Regolith-like product "LHS-1D" (HSP values: (18.2, 16.1, 13.2), SiO2 content: 51.2% by mass, Al2O3 content: 26.6% by mass)

[0062] [Examples 1-3, Comparative Examples 1-3] <Preparation of resin composition pellets> A mixture was obtained by dry blending the thermoplastic resin (A) and inorganic filler (B) (regolith) shown in Table 2 in the proportions shown in Table 2. This mixture was fed into a twin-screw extruder (20 mmφ) equipped with a two-hole die, extruded under the following extrusion conditions (required time 5 minutes), and the extruded strand was cooled and solidified by air cooling. Next, the solidified strands were cut with a pelletizer to obtain pellets of the resin composition. (Extrusion conditions) Extruder setting temperature (℃): C1 / C2 / C3 / C4 / C5 / C6 =200 / 210 / 225 / 225 / 225 / 225

[0063] <Preparation of test specimens and tensile testing> Using the prepared pellets, a dumbbell-shaped test specimen with a thickness of 4 mm and a gauge distance of 115 mm was obtained by injection molding at a nozzle temperature of 210°C using an electric injection molding machine (manufactured by Nissei Plastic Industrial Co., Ltd.). Using the obtained test specimens, tensile tests were performed using an Autograph AG-IS5kN (manufactured by Shimadzu Corporation) with a chuck distance of 115 mm, in accordance with JIS K7139, at room temperature of 23°C and a speed of 50 mm / min. From the obtained stress-strain curve, the maximum stress (fracture stress) and fracture elongation were determined. The results are shown in Table 2.

[0064] [Reference examples 1 and 2] Without incorporating regolith, pellets, test specimens, and tensile tests were performed using only the thermoplastic resin (A) shown in Table 2, in the same manner as in Example 1, and the results are shown in Table 2.

[0065] The evaluation criteria for pelletization and injection moldability in Table 2 are as follows:

[0066] <Pelletization> ○: Pellet production is possible without breakage. △: Occasionally, breaks may occur in the strand, but pellet production is still possible. ×: The strands regularly break, making pellet production difficult. ××: Numerous breaks occurred in the strands, making pellet production impossible.

[0067] <Injection moldability> ○: Injection molded parts can be obtained without any problems. ×: The ejector pin causes the molded product to break or crack during extrusion, making it impossible to obtain the molded product. -: Injection molding was not performed as pellet production was impossible.

[0068] [Table 2]

[0069] From Table 2, the following can be seen. With polycarbonate resin, the maximum stress actually decreases and the elongation at break decreases significantly when regolith is added compared to when it is not added. Furthermore, if the amount of regolith added to polycarbonate resin is increased, pelletization and injection moldability are impaired, making it unsuitable for practical use. On the other hand, ethylene-vinyl alcohol copolymers offer excellent pelletization and injection moldability, and the maximum stress can be increased according to the amount of regolith added, while also suppressing the decrease in elongation at break.

Claims

1. A resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), The difference in HSP values ​​between the thermoplastic resin (A) and the inorganic filler (B) is 0.1 to 11.

0. The inorganic filler (B) is SiO ２ including, and, A resin composition in which the content of the inorganic filler (B) is 50% by mass or less with respect to the total amount of the resin composition.

2. The HSP value (δ) of the inorganic filler (B) Ｄ , δ Ｐ , δ Ｈ The resin composition according to claim 1, wherein the following conditions are met. 15.0≦δ Ｄ ≦20.0 15.0≦δ Ｐ ≦20.0 10.0≦δ Ｈ ≦15.0

3. A resin composition comprising a thermoplastic resin (A) and an inorganic filler (B), The thermoplastic resin (A) includes a polyvinyl alcohol-based resin, The inorganic filler (B) is SiO ２ including, and, A resin composition in which the content of the inorganic filler (B) is 50% by mass or less with respect to the total amount of the resin composition.

4. The resin composition according to any one of claims 1 to 3, wherein the thermoplastic resin (A) comprises an ethylene-vinyl alcohol copolymer.

5. The resin composition according to claim 4, wherein the content of ethylene structural units in the ethylene-vinyl alcohol copolymer is 20 to 60 mol%.

6. The content ratio of the SiO ２ is 20 to 60% by mass based on the total amount of the inorganic filler (B). The resin composition according to any one of claims 1 to 3.

7. The inorganic filler (B) is further Al ２ O ３ A resin composition according to any one of claims 1 to 3, comprising:

8. The aforementioned Al ２ O ３ The resin composition according to claim 7, wherein the content of is 10 to 50% by mass relative to the total amount of inorganic filler (B).

9. The resin composition according to any one of claims 1 to 3, wherein the inorganic filler (B) is regolith.

10. A molded article obtained by molding a resin composition according to any one of claims 1 to 3.

11. A building material obtained by molding a resin composition according to any one of claims 1 to 3.

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