JP2019014798A - Polyolefin resin composition, polyolefin resin molding using the same, and vacuum cleaner using the same - Google Patents

Abstract

To provide a polyolefin resin composition that is optimal for a resin molding which is lightweight and has excellent impact resistance and surface hardness.SOLUTION: A polyolefin resin composition contains (A) polyolefin resin 51, (B) particulate hollow member 52, (C) elastomer component 53, and (D) modified polyolefin resin 54, where the surface of (B) the hollow member 52 does not contain a hollow member compatible component which has non-compatibility with (A) the polyolefin resin 51 and improves compatibility of the surface of (B) the hollow member 52 with respect to (A) the polyolefin resin 51, and can prevent lowering impact resistance and chipping resistance of a resin molding (not-shown in the figure) constituted of the polyolefin resin composition 50.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polyolefin resin composition suitably used for a resin molded body of a vacuum cleaner part, a polyolefin resin molded body molded using the polyolefin resin composition and used as a vacuum cleaner part, The present invention relates to a vacuum cleaner including a polyolefin resin molded body as a vacuum cleaner component.

  Polyolefin resin compositions mainly composed of polypropylene or the like are widely used in various fields because they are excellent in mechanical strength and molding processability, and are inexpensive and lightweight. In particular, in the field of household electrical appliances, since weight reduction is required, resin molded bodies (polyolefin resin molded bodies) obtained by molding a polyolefin resin composition are widely used as parts for household electrical appliances.

  In the field of home appliances, since there is a demand for further weight reduction, conventionally, for example, studies have been made to reduce the thickness of the polyolefin resin molded body by reducing the thickness thereof. However, if the wall thickness becomes too small, the rigidity or impact resistance of the polyolefin resin molding may be lowered. Therefore, a technique for reducing the weight by adding various fillers to the polyolefin resin molded body is known. Among these, a hollow inorganic filler (hollow filler) is preferably used as the filler. Typical hollow fillers include those made of glass.

  For example, in Patent Document 1, a polyolefin resin such as polypropylene is preferably used as a matrix material (base material), and as a hollow filler, a first layer containing a silane coupling agent on the surface of a hollow member, and anhydrous maleic acid are used. There is disclosed a resin molded article having a configuration in which a hollow filler is dispersed in a polyolefin resin using a material including an acid-modified polyolefin resin and a second layer bonded to the first layer.

  In Patent Document 1, as described above, the surface of the hollow filler has a two-layer structure, and thereby the damage prevention effect of the hollow filler is improved by the maleic anhydride-modified polyolefin resin, which is the second layer. ing. Furthermore, Patent Document 1 discloses that the surface of the hollow filler has a two-layer structure, thereby improving the adhesion with the polyolefin resin as the matrix material and improving the strength of the polyolefin resin molded body.

Japanese Patent No. 5542733

  However, as a result of intensive studies by the inventors of the present application, it has been clarified that the conventional technology cannot sufficiently improve the impact resistance of the polyolefin resin molded article. In particular, if the home appliance is a hand-held type, that is, if the user grips at least a part (gripping part) at the time of use, a part other than the grip part of the home appliance collides with a surrounding object at the time of use. In addition, depending on the use situation, there is a risk that the home appliance will fall away from the user's hand. As a specific example, if the home appliance is a vacuum cleaner, the suction tool (nozzle) or the like may collide with various objects during use.

  For this reason, in a household electrical appliance that can collide with other objects or drop during use, such as a hand-held household electrical appliance, the parts are required to have higher impact resistance than usual. As in Patent Document 1, in a polyolefin resin molded body having high adhesion between the hollow filler and the matrix material (polyolefin resin), for example, the impact resistance required as a suction tool may not be sufficiently realized. Furthermore, many of the components of home-handheld home appliances have a structure such as a rib instead of a flat shape, and stress concentrates on the rib root, and there is a possibility that sufficient impact resistance cannot be realized.

  The present invention has been made to solve such problems, and is suitably used as a part for home appliances, and can achieve excellent impact resistance while realizing good weight reduction. It aims at providing the polyolefin resin composition which can be used suitably for manufacture of a polyolefin resin molding and this polyolefin resin molding.

  In order to solve the above-mentioned problems, the polyolefin resin composition according to the present invention is used in a resin molded body constituting a part for home appliances, (A) a polyolefin resin, (B) a particulate hollow member, (C) An elastomer component and (D) a modified polyolefin resin, wherein the (D) modified polyolefin resin has a high affinity with the modified group (B) and (A) the polyolefin resin. The structure has a polyolefin portion.

  According to the said structure, (B) hollow member and (C) elastomer component and (D) modified polyolefin resin are mixed with (A) polyolefin resin which is a matrix material (base material), (B) hollow member Although the weight of the polyolefin resin composition can be reduced by mixing, (B) the surface of the hollow member is fixed, and (D) the polyolefin portion of the modified polyolefin resin is compatible with (A) the polyolefin resin. Become. Therefore, when an impact is applied to the resin molded body composed of this polyolefin resin composition, at the interface of (B) the hollow member, (A) the polyolefin resin and (B) the hollow member become slippery at a place where they are not fixed. In addition to reducing the possibility of the resin molded body cracking, (D) modified polyolefin resin (A) polyolefin resin and (B) part of the hollow member are fixed, and the strength of the polyolefin resin composition is By improving, it becomes a tough polyolefin resin composition, and the possibility that the resin molded body will break not only with a flat surface but also with a structure where stress such as rib roots concentrates is reduced. Moreover, the surface hardness of a resin molding can be improved because (A) polyolefin resin and a part of (B) hollow member adhere.

  Furthermore, the (C) elastomer component is contained in the polyolefin resin composition, and the impact resistance can be drastically improved by combining this (C) elastomer component with the (B) hollow member.

  As a result, the resin molded body using this polyolefin resin composition can achieve excellent impact resistance, toughness, and surface hardness while realizing good weight reduction. It can be suitably used as a part for home appliances that are required to suppress surface damage.

  The present invention includes a polyolefin resin molded body, which is a part for home appliances constituted by using at least the polyolefin resin composition. As such a polyolefin resin molding, the suction tool of a vacuum cleaner is mentioned, for example.

  Furthermore, the present invention also includes a vacuum cleaner provided with a component composed of the polyolefin resin molded body as a representative example of home appliances.

  The polyolefin resin composition of the present invention can be suitably used for production of a polyolefin resin molded article having excellent impact resistance while realizing good weight reduction. And the vacuum cleaner component which is lightweight and has the outstanding impact resistance and surface hardness can be provided by comprising the component of a vacuum cleaner with this polyolefin resin molding.

Typical sectional drawing which shows the typical structure of the polyolefin resin composition of this invention Typical sectional drawing which shows the typical structure of the conventional polyolefin resin composition The perspective view of the suction tool which shows an example of the polyolefin resin molding which consists of the same polyolefin resin composition Whole perspective view of a paper pack type electric vacuum cleaner including the polyolefin resin molding Whole perspective view of cyclone type vacuum cleaner including the polyolefin resin molding

  The polyolefin resin composition according to the present disclosure is used for a resin molded body constituting a part for home appliances, and includes (A) a polyolefin resin, (B) a particulate hollow member, (C) an elastomer component, and (D). The modified polyolefin resin contains a modified polyolefin resin, and the (D) modified polyolefin resin has a modified group having a high affinity with the (B) hollow member and a polyolefin portion having a high affinity with the (A) polyolefin resin.

  According to the said structure, (B) hollow member, (C) elastomer component, and (D) modified polyolefin resin are mixed with (A) polyolefin resin which is a matrix material (base material), (B) hollow member Although the weight of the polyolefin resin composition can be reduced by mixing, (B) the surface of the hollow member is fixed, and (D) the polyolefin portion of the modified polyolefin resin is compatible with (A) the polyolefin resin. Become. Therefore, when an impact is applied to the resin molded body composed of this polyolefin resin composition, at the interface of (B) the hollow member, (A) the polyolefin resin and (B) the hollow member become slippery at a place where they are not fixed. In addition to reducing the possibility of the resin molded body cracking, (D) modified polyolefin resin (A) polyolefin resin and (B) part of the hollow member are fixed, and the strength of the polyolefin resin composition is By improving, it becomes a tough polyolefin resin composition, and the possibility that the resin molded body will break not only with a flat surface but also with a structure where stress such as rib roots concentrates is reduced. Moreover, the surface hardness of a resin molding can be improved because (A) polyolefin resin and a part of (B) hollow member adhere.

  Furthermore, the (C) elastomer component is contained in the polyolefin resin composition, and the impact resistance can be drastically improved by combining this (C) elastomer component with the (B) hollow member.

  As a result, the resin molded body using this polyolefin resin composition can achieve excellent impact resistance, toughness, and surface hardness while realizing good weight reduction. It can be suitably used as a part for home appliances that are required to suppress surface damage.

  The present invention includes a polyolefin resin molded body, which is a part for home appliances constituted by using at least the polyolefin resin composition. As such a polyolefin resin molding, the suction tool of a vacuum cleaner is mentioned, for example.

In the polyolefin resin composition having the above structure, when the total weight of the (B) hollow member, the (A) polyolefin resin, the (C) elastomer component, and the (D) modified polyolefin resin is 100% by weight, The content of the (B) hollow member is in the range of 1 to 50% by weight, the content of the (C) elastomer component is in the range of 1 to 20% by weight, and the content of the (D) modified polyolefin resin is 0.00. The structure which exists in the range of 5 to 15 weight% may be sufficient.

  In the polyolefin resin composition having the above-described configuration, the (A) polyolefin resin is at least polypropylene, the (B) hollow member is made of glass, and the (C) elastomer component is a styrene-based elastomer, It is at least one of styrene rubber, olefin elastomer, and olefin rubber, and (D) the modified polyolefin resin may be an acid modified polyolefin resin or an amine modified polyolefin resin.

  In the polyolefin resin composition having the above-described configuration, the (C) elastomer component may be at least one styrene-based elastomer selected from the group consisting of SEBS, SEPS, and SEB.

  Moreover, in the polyolefin resin composition of the said structure, the said (A) polyolefin resin is comprised in what the contact angle (theta) of water exists in the range of 85-100 degrees, The surface of the said (B) hollow member is The structure which the contact angle (theta) of water exists in the range of 0-10 degrees may be sufficient.

  The polyolefin resin molded body according to the present invention may be any part for home appliances configured using at least the polyolefin resin composition having the above-described configuration. Examples of the appliance parts include a vacuum cleaner suction tool.

  Moreover, the vacuum cleaner provided with the components comprised with the polyolefin resin molding of the said structure is also contained in this invention.

  Hereinafter, representative embodiments of the present disclosure will be described. The polyolefin resin composition according to the present disclosure contains (A) a polyolefin resin, (B) a particulate hollow member, (C) an elastomer component, and (D) a modified polyolefin resin, The resin has a structure having a modified group having high affinity with the (B) hollow member and a polyolefin resin portion having high affinity with the (A) polyolefin resin.

[(A) Polyolefin resin]
The (A) polyolefin resin contained in the polyolefin resin composition according to the present disclosure may be a polymer obtained by polymerizing at least one olefin monomer. Typically, ethylene, propylene (propene), 1-butene is used. , 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and other α-olefins may be used as long as they are polymerized.

  Specifically, for example, polyethylenes such as high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and very low density polyethylene (VLDPE, ULDPE); homopolypropylene, random polypropylene, Polypropylenes such as block polypropylene; ethylene copolymers such as ethylene / propylene copolymers, ethylene / vinyl ester copolymers, ethylene / vinyl silane compound copolymers, ethylene / (meth) acrylic acid compound copolymers; etc. Can be mentioned. Only one type of these (A) polyolefin resins may be used, or two or more types may be used in appropriate combination. Of these, polypropylenes are particularly preferred.

Among the polypropylenes, the type of monomers other than polypropylene contained in random polypropylene or block polypropylene is not particularly limited, and may be α-olefin such as ethylene, or α- as exemplified in the ethylene copolymer. A polymerizable compound other than olefin may be used. The ethylene copolymer may be a random copolymer, a block copolymer, or a graft copolymer.

  (A) More specific physical properties of the polyolefin resin, such as molecular weight (number average molecular weight Mn or weight average molecular weight Mw, etc.), stereoregularity (when it has a side chain) or (non) crystallinity, density (specific gravity), It does not specifically limit about glass transition point (Tg) etc., According to the kind of component for household appliances used as shaping | molding object, it can set suitably. In addition, when it is desired to reduce the weight of home appliance parts as much as possible, there is a balance with other physical properties, but it is preferable that the density (specific gravity) is as small as possible.

[(B) Hollow member]
The (B) hollow member contained in the polyolefin resin composition according to the present disclosure is not particularly limited as long as it is particulate and the inside is hollow. (B) Although the material of a hollow member is not specifically limited, Typically, inorganic materials, such as glass and a ceramic, can be mentioned. More specific examples of the hollow member (B) include glass hollow fillers (hollow glass) such as glass bubbles. Since the hollow glass has a low affinity (has non-affinity) for (A) the polyolefin resin, it can be suitably used particularly in the present disclosure.

  (B) Specific physical properties of the hollow member, for example, average particle diameter, pressure strength, true density, thermal stability, and the like are not particularly limited, and are appropriately set according to the type of home appliance product to be molded. be able to.

  In the present disclosure, the surface of (B) the hollow member has non-affinity to (A) the polyolefin resin. For example, the non-affinity referred to here is (B) the surface of the hollow member and (A) the polyolefin. It can be quantified by the contact angle θ (water contact angle θ) when water is brought into contact with the surface of the resin. More specifically, (B) the material constituting the hollow member, or (A) a polyolefin resin as a sample having a predetermined shape, and then measuring the contact angle θ with a known contact angle meter, Non-affinity can be quantified.

  In the present disclosure, the water contact angle θ of (A) the polyolefin resin generally falls within the range of 85 to 100 ° C. Polypropylene, which is a typical polyolefin resin, is known to have a water contact angle θ in the range of 95 to 98 °, and the water contact angle θ of polyethylene is known to be about 88 °. Yes. Therefore, the contact angle θ of the matrix material (resin) that can be used as the (A) polyolefin resin in the present disclosure may be in the range of 85 to 100 °.

  On the other hand, the contact angle θ of water on the surface of the (B) hollow member may be 10 ° or less, that is, 0 to 10 °, and 5 ° or less, that is, 0 to 5 °. If there is, it is preferable. When the affinity for water, that is, the presence or absence of hydrophilicity is determined from the contact angle θ, it is known that the contact angle θ is 30 ° as a boundary value (if it is 30 ° or less, it is determined that there is hydrophilicity). Further, it is known that if the contact angle θ is 10 ° or less, it is determined that the surface has a very high affinity (superhydrophilicity) for water. On the other hand, it is known that if the contact angle θ is 90 ° or more, the surface is judged to have water repellent properties, that is, water repellency.

  In the present disclosure, the (A) polyolefin resin does not have hydrophilicity to the extent that it exhibits water repellency. On the other hand, the surface of (B) the hollow member is in a state of exhibiting super hydrophilicity. Thus, in the present disclosure, the fact that (B) the surface of the hollow member has (A) non-affinity with the polyolefin resin can be quantified by the contact angle θ.

[(C) Elastomer component]
The (C) elastomer component contained in the polyolefin resin composition according to the present disclosure can be mixed with the (A) polyolefin resin that is a matrix material, and is contained in the polyolefin resin composition as a component of the polyolefin resin composition. Any material may be used as long as it does not substantially affect the molding of the material.

  Specific examples of the elastomer component (C) include thermoplastic elastomers such as styrene elastomers, olefin elastomers, vinyl chloride elastomers, urethane elastomers and amide elastomers; styrene rubbers, isoprene rubbers, and butadiene rubbers. And diene rubbers such as butyl rubber, ethylene propylene rubber, ethylene propylene diene rubber, and urethane rubber. These elastomer components may be used alone or in combination of two or more. Among these, an elastomer or rubber containing a styrene structure, or an elastomer or rubber containing an olefin structure is preferably used, and a styrene elastomer is particularly preferably used.

  Any elastomer or rubber containing a styrene structure may be used as long as it contains a styrene skeleton and exhibits rubber elasticity. Specific examples include styrene-based elastomers and styrene-based rubbers.

  Styrene-based elastomers (TPE-S) may be those containing polystyrene as a hard segment as a main component in the molecule and polybutadiene or polyisoprene as a soft segment as a subcomponent. The styrene rubber may be a diene rubber having a styrene skeleton such as a styrene-butadiene copolymer (SBR).

  Specific examples of these styrene-based elastomers or styrene-based rubbers include, for example, styrene-butadiene-butylene-styrene block copolymer (SBBS), styrene-ethylene-butylene-styrene block copolymer (SEBS), and hydrogenation. Styrene-butadiene rubber (HSBR), styrene-ethylene / butylene-ethylene block copolymer (SEBC), styrene-ethylene / propylene-styrene block polymer (SEPS), and the like. These styrene rubbers or styrene elastomers may be used alone or in combination of two or more, or may be used in combination of elastomers other than styrene rubber or styrene elastomer. . Among these, at least one styrenic elastomer selected from the group consisting of SEBS, SEPS, and SEB is particularly preferably used.

  Here, it is generally known that the styrene-based elastomer is not particularly compatible with polypropylene, among the (A) polyolefin resins. And the polyolefin resin composition which concerns on this indication has mixed the (B) hollow member which has a non-affinity surface with respect to (A) polyolefin resin. Thus, by using a combination of two components that are difficult to mix with the matrix material, the impact resistance of the resulting resin molded body can be dramatically improved, as will be described later.

  Any elastomer or rubber containing an olefin structure may be used as long as it contains an olefin skeleton as a hard segment and a rubber or elastomer component as a soft segment. Specific examples include olefin elastomers and olefin rubbers.

The olefin elastomer is not particularly limited as long as it includes a hard segment composed of polyolefin and a soft segment composed of a rubber component.
Specifically, for example, a polyolefin component such as polypropylene or polyethylene blended (blended) with a rubber component such as ethylene-propylene rubber; a polyolefin and rubber component blended partially; a polyolefin and rubber component blended And a completely cross-linked product; a copolymer of an olefin monomer and a monomer as a rubber component; and the like. These olefin-based elastomers may be used alone or in combination of two or more.

  The olefin rubber is not particularly limited as long as it contains ethylene monomer or propylene monomer and has rubber elasticity. Specific examples include ethylene propylene rubber (EPR, EPM), ethylene propylene diene rubber (EPT, EPDM), ethylene-vinyl acetate copolymer (ethylene vinyl acetate rubber), and the like.

  Since the olefin-based elastomer or olefin-based rubber includes an olefin-derived structure, the olefin-based elastomer or olefin-based rubber has an affinity for the (A) polyolefin resin that is a matrix material of the polyolefin resin composition according to the present disclosure. Therefore, it is considered that the compatibility of the components (A) and (C) is improved. On the other hand, since the surface of (B) hollow member has non-affinity for (A) polyolefin resin, if (C) the elastomer component is an olefin elastomer, Will also have non-affinity. Thereby, since it is thought that the effect by the mixing | blending of the (B) hollow member is exhibited favorably, the impact resistance of the resin molding obtained can be improved.

[(D) Modified polyolefin resin]
Modified polyolefin resins include acid-modified polyolefin resins and amine-modified polyolefin resins in which polyolefin is modified by graft reaction of polyolefin and unsaturated carboxylic acid, and exhibit excellent adhesion to metals and various fillers.

  Examples of the acid-modified polyolefin resin include maleic anhydride-modified polypropylene and maleic anhydride-modified polyethylene. Examples of other than maleic acid include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, polypropylene modified with these acid anhydrides, and polyethylene.

  These modified polyolefin resins may be used alone or in combination of two or more.

  In particular, polypropylene modified with maleic anhydride and maleic acid is preferably used.

  In the modified polyolefin resin, the modified part is fixed to a part of the (B) hollow member, the polyolefin part is compatible with the (A) polyolefin resin, and the strength of the polyolefin resin composition is improved. By slipping and further, the elastomer (C) is present in the polyolefin (A) and the impact resistance is drastically improved, so that the resin molded body made of the polyolefin resin composition becomes a tough resin molded body. This reduces the possibility of cracking not only in a plane but also in a structure where stresses such as rib roots are concentrated.

[(E) Other ingredients]
The polyolefin resin composition according to the present disclosure includes (A) a polyolefin resin, (B) a hollow member, (C) an elastomer component, and (D) a modified polyolefin resin, as long as the effects of the present disclosure are not impaired. Other known components can be included. Specifically, for example, antioxidants, light stabilizers, ultraviolet absorbers, antistatic agents, dispersants, nucleating agents, plasticizers, neutralizers, colorants (pigments, dyes), foaming agents, lubricants, Examples include flame retardants, copper damage inhibitors, fillers (excluding (B) hollow members), and the like.

  However, the (E) other component does not include the (A) hollow member affinity component that significantly improves the affinity of the surface of the (B) hollow member for the polyolefin resin. (B) When a hollow member affinity component that significantly improves the affinity of the hollow member surface is contained, even if (C) elastomer is contained in (A) polyolefin resin, (D) through the modified polyolefin resin, ( B) Since the surface of the hollow member exhibits a very strong affinity for (A) polyolefin resin, (B) the hollow member firmly adheres to (A) polyolefin resin. Therefore, the impact resistance of the resin molded body is lowered, and (B) it is easy to crack starting from the hollow member.

  In the present disclosure, as described above, the hollow member affinity component that remarkably improves the affinity of the surface of the hollow member is (A) the modified polyolefin resin, and (A) the affinity of the surface of the hollow member for (A) the polyolefin resin. Is defined as a component having the property of significantly improving. Specific examples of the hollow member affinity component that significantly improves the affinity of the hollow member surface include, but are not particularly limited to, a surface modifier. The surface modifying agent (B) modifies the surface of the hollow member and directly and significantly improves the affinity of the surface to the (A) polyolefin resin via the (D) modified polyolefin resin. Examples of the surface modifier include a silane coupling agent (see Patent Document 1). The silane coupling agent is an adhesion aid for firmly bonding the inorganic substance and the organic substance, and further strengthens the affinity between (A) the polyolefin resin and (B) the hollow member. In addition, a cross-linked structure is formed to improve the strength.

[Polyolefin resin composition]
The polyolefin resin composition according to the present disclosure contains (A) a polyolefin resin, (B) a hollow member, and (C) an elastomer component and (D) a modified polyolefin resin as described above. Other components are also contained. However, the polyolefin resin composition according to the present disclosure does not contain a hollow member affinity component that remarkably improves the affinity of the hollow member surface described above.

  FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polyolefin resin composition of the present invention, and FIG. 2 is a schematic cross-sectional view showing a schematic configuration of a conventional polyolefin resin composition.

  The polyolefin resin composition 50 in the present embodiment has a configuration in which (B) hollow members 52 are dispersed in (A) polyolefin resin 51 which is a matrix material. This is the same as the conventional polyolefin resin composition 60.

  Here, in the polyolefin resin composition 50 in the present embodiment, a binding portion (B) between the surface of the hollow member 52 and the (A) polyolefin resin 51 is schematically shown in FIG. (Not shown) is presumed to be formed by (D) the modified polyolefin resin 54.

  Further, the polyolefin resin composition 50 according to the present disclosure includes (C) an elastomer component 53. When an impact is applied to the molded article of the polyolefin resin composition 50, the kinetic energy of the impact is absorbed by the (C) elastomer component 53 existing around the hollow member 52, as schematically shown in FIG. At the same time, (D) the modified polyolefin resin 54 is presumed to improve the strength of the polyolefin resin composition 50 because (B) the surface of the hollow member 52 and (A) the polyolefin resin 51 are bonded.

Therefore, even if an impact is applied to the molded body of the polyolefin resin composition 50, (B) the hollow member 52 has a high impact resistance. (C) The elastomer component 53 has a reduced impact energy, and (B) By combining the surface of the hollow member 52 and the (A) polyolefin resin 51, the strength is improved, and a tough polyolefin resin composition 50 having both strength and impact resistance is obtained, and the impact resistance is considered to be increased. . In particular, when the molded body is not only flat, but also has a structure in which stresses such as rib roots are concentrated, the impact resistance is improved. Moreover, the surface hardness of a resin molding can be improved because (A) polyolefin resin and a part of (B) hollow member adhere.

  Further, (B) the surface of the hollow member 52 and (A) the polyolefin resin 51 are bonded to each other via the (D) modified polyolefin resin 54, so that the strength is improved.

  Although the type of the (C) elastomer component 53 is not particularly limited, for example, if the (C) elastomer component 53 is an olefin-based material, the compatibility with the (A) polyolefin resin 51 is high. Since (C) elastomer component 53 is well dispersed in resin 51), it is presumed that good impact resistance can be obtained.

  On the other hand, if the (C) elastomer component 53 is styrene, the compatibility with the (A) polyolefin resin 51 tends to be low. If the compatibility is low, it is presumed that the matrix material ((A) polyolefin resin 51) cannot be dispersed well and the impact resistance is not improved. However, when the (C) elastomer component 53 is a styrene type, better impact resistance is obtained compared to the olefin type. This is because, in the matrix material ((A) polyolefin resin 51), the molecules of (A) polyolefin resin 51 are not sufficiently mixed with the molecules of (A) polyolefin resin 51. Therefore, the molecules of (C) elastomer component 53 can exhibit good rubber elasticity. It is presumed that.

  As described above, the polyolefin resin composition 50 according to the present disclosure includes (B) the hollow member 52, (C) the elastomer component 53, and (D) the binding portion formed of the polyolefin resin. Hardness can be achieved.

  On the other hand, as shown in FIG. 2, the conventional polyolefin resin composition 60 contains a hollow member affinity component that significantly improves the affinity of the surface of the hollow member. Therefore, as schematically shown as a black area in FIG. 2, (B) a very strong contact is formed around the hollow member 52 by the action of the affinity member for the hollow member that significantly improves the affinity of the surface of the hollow member. A surface 61 is formed. As a result, when an impact is applied to the molded article of the polyolefin resin composition 60, unlike the polyolefin resin composition 50 according to the present disclosure, it is difficult for the kinetic energy of the impact to be dispersed or absorbed. (B) Hollow member There is a risk of concentrating starting from 52.

  As a result, it is considered that the conventional polyolefin resin composition 60 cannot achieve good impact resistance.

  (A) Polyolefin resin, (B) hollow member, and (C) elastomer component and (D) modified polyolefin resin content, that is, content of (A) to (D) components in polyolefin resin composition (content ratio) The blending ratio) is not particularly limited, and can be appropriately set according to various conditions such as the type, application, size, and use environment of the resin molded body to be molded.

  Typically, for example, the content of (B) hollow member is 100% by weight based on the total weight of (A) polyolefin resin, (B) hollow member, and (C) elastomer component and (D) modified polyolefin resin. In the range of 1 to 50% by weight, and preferably in the range of 5 to 30% by weight.

  If the content of the (B) hollow member is less than 1% by weight, although depending on various conditions, the weight ratio of the (B) hollow member in the polyolefin resin composition is small, so the effect of weight reduction is sufficient. It may not be obtained. On the other hand, if it exceeds 50% by weight, the bulk density of the (B) hollow member in the polyolefin resin composition becomes relatively large. Therefore, although depending on various conditions, when the polyolefin resin composition is produced, workability when kneading each component may be lowered, and mechanical properties of the obtained polyolefin resin composition may be lowered.

  The sum of the contents of (C) elastomer component and (D) modified polyolefin resin is the total weight of (A) polyolefin resin, (B) hollow member, and (C) elastomer component and (D) modified polyolefin resin. When it is 100% by weight, it may be in the range of 1.5 to 35% by weight, and preferably in the range of 5.5 to 25% by weight.

  Among them, the (C) elastomer component may be in the range of 1 to 20% by weight, and preferably in the range of 5 to 20% by weight. Moreover, (D) modified polyolefin resin should just exist in the range of 0.5 to 15 weight%, and it is preferable to exist in the range of 0.5 to 10 weight%.

  (C) If the content of the elastomer component is less than 1% by weight, although depending on various conditions, since the “concentration” of the (C) elastomer component contained in the polyolefin resin composition is not high, the resulting polyolefin resin In some cases, the composition may not be sufficiently improved in impact resistance. Further, if the content of the (C) elastomer component exceeds 20% by weight, the “concentration” of the (C) elastomer component contained in the polyolefin resin composition is increased depending on various conditions. Although the impact resistance of the product is improved, since the ratio of the (A) polyolefin resin which is a matrix material is reduced, there is a concern that the strength of the polyolefin resin composition may be reduced.

  (D) If the content of the modified polyolefin resin is less than 0.1% by weight, although depending on various conditions, the (concentration) of the (D) modified polyolefin resin contained in the polyolefin resin composition is not high. In the obtained polyolefin resin composition, the improvement of surface hardness may not be fully expected. Further, if the content of (D) the modified polyolefin resin exceeds 15% by weight, although depending on various conditions, the “concentration” of the (D) modified polyolefin resin component contained in the polyolefin resin composition is increased. Although the surface hardness of the polyolefin resin composition is improved, since the adhesion between the (A) polyolefin resin as the matrix material and the (B) hollow member is increased, there is a concern about a decrease in impact resistance.

  When the polyolefin resin composition according to the present disclosure comprises (A) a polyolefin resin, (B) a hollow member, (C) an elastomer component, and (D) a modified polyolefin resin component, that is, each of (A) to (D) In the case of including only components classified as components and not including (E) other components, the content of (A) polyolefin resin is 100% by weight based on the total weight of components (A) to (D). Sometimes it may be in the range of 15-97.5% by weight, preferably in the range of 45-89.5% by weight.

  (A) If content of polyolefin resin is less than 20 weight%, although depending on various conditions, since the ratio of a matrix material will fall, we are anxious about the strength fall of a polyolefin resin composition. Further, when the content of (A) polyolefin resin exceeds 97.5% by weight, depending on various conditions, in the polyolefin resin composition, (B) hollow member, (C) elastomer component, (D) modified polyolefin There is a possibility that at least one of the resins cannot be contained in a sufficient amount.

In addition, as above-mentioned, the polyolefin resin composition which concerns on this indication is (A) other components (A)-(D) component other than (However, (A) Affinity of (B) hollow member surface with respect to polyolefin resin. (Excluding the component for affinity for hollow member that remarkably improves). At this time, the content of (E) other components is not particularly limited, and the required amount is appropriately added according to the purpose of adding (E) other components or the type of (E) other components. be able to.

[Production method of polyolefin resin composition]
In the polyolefin resin composition according to the present disclosure, at least (A) a polyolefin resin, (B) a hollow member, (C) an elastomer component and (D) a modified polyolefin resin, and optionally (E) other components are optional. In this order, they are blended in an arbitrary blending amount, kneaded with a known kneader, granulated as necessary, and molded with a known molding machine.

  As the kneader for blending the components (A) to (D) (if necessary, the component (E)) during production of the polyolefin resin composition, a known one can be suitably used. Specific examples include kneaders such as a single screw extruder, a twin screw extruder, a super mixer, a Henschel mixer, a Banbury mixer, a roll mixer, a Brabender plastograph, and a kneader. These kneaders may be configured to allow granulation. In addition, before kneading with a kneader, at least one of the components (A) to (D) (optionally (E) component) may be preliminarily kneaded.

  The polyolefin resin composition according to the present disclosure can be obtained by kneading the components (A) to (D) as described above, or can be obtained by granulation after kneading. Such a polyolefin resin composition can be molded as a polyolefin resin molding using various known molding machines. Although it does not specifically limit as a concrete molding machine, For example, an injection molding machine, an extrusion molding machine, a sheet molding machine, a vacuum molding machine etc. can be used.

  Although the polyolefin resin molding which concerns on this indication should just be comprised using the polyolefin resin composition mentioned above, it may also contain materials other than a polyolefin resin composition. The polyolefin resin molded product according to the present disclosure can exhibit good impact resistance, but the impact resistance evaluation method is not particularly limited.

  In the present embodiment, as will be described in Examples and the like to be described later, a polyolefin resin composition is molded into, for example, a 1.6 mm thick plate to obtain a test piece of a polyolefin resin molded body. It can be allowed to stand at 10 ° C. for 3 hours, after which a weight of 250 g is dropped on the test piece, and the evaluation can be made based on the maximum height at which the test piece was not broken. The larger the maximum height, the better the impact resistance. In the present disclosure, the maximum height only needs to exceed 80 cm. If the maximum height is less than 80 cm, (B) only the same or lower impact resistance as that of the conventional polyolefin resin composition reduced in weight by the hollow member can be exhibited. In addition, the upper limit of the maximum height is not particularly limited, and a larger numerical value is desirable, but there is an upper limit on physical properties according to the composition of the polyolefin resin composition.

[Polyolefin resin molded product]
Although the use of the polyolefin resin molded product according to the present disclosure is not particularly limited, examples of typical uses include home appliance parts. Although the kind of concrete household appliances is not specifically limited, Typically, a handheld household appliance can be mentioned, for example. Since the user holds at least a part of the hand-held home appliance at the time of use, the user may collide with or drop the object at the time of use. Therefore, it is desirable that the parts included in such a hand-held home appliance have good impact resistance. Specific examples of the hand-held home appliance include a vacuum cleaner, a dryer, a shaver, a hand mixer, an electric kettle (electric kettle), and the like.

  As a typical example of the polyolefin resin molding according to the present disclosure, a suction tool of a vacuum cleaner can be given. Since the suction tool collides with various objects during use, it is required to have higher impact resistance than a normal part. Therefore, it can be mentioned as a particularly preferred example of the polyolefin resin molded body (parts for home appliances) according to the present disclosure.

  FIG. 3 is a perspective view of a suction tool as a typical example of a polyolefin resin molded body according to the present disclosure.

  In FIG. 3, the suction tool 30 has a substantially T-shaped outer shape, and includes a suction tool body 31, a movable part 32, a connecting pipe part 33, and the like. The suction tool main body 31 has a substantially rectangular parallelepiped shape, and a movable part 32 is swingably provided at the center rear part in the longitudinal direction. Further, a suction port (not shown) is provided on the lower surface of the suction tool body 31, and the suction port communicates with the inside of the movable portion 32. The movable part 32 swings up and down along a direction orthogonal to the longitudinal direction of the suction tool body 31. The other end of the movable portion 32 is a connecting tube portion 33, which is detachably connected to the distal end (the other end) of the extension tube 15 or the extension tube 25 described later.

  The suction tool 30 is not composed of a single member, but is composed of a plurality of members. In the suction tool 30 as the polyolefin resin molded body according to the present disclosure, all members constituting the suction tool 30 may be configured by the polyolefin resin composition according to the present disclosure, for example, more excellent impact resistance. Only the site | part where property is requested | required may be comprised with the polyolefin resin composition which concerns on this indication. For example, the whole suction tool main body 31 may be comprised with the polyolefin resin composition which concerns on this indication. Moreover, the member which comprises the site | part which collides easily with a wall surface etc. like the member which comprises the front surface of the suction tool main body 31, or the both sides | surfaces of the suction tool main body 31 is the polyolefin resin composition which concerns on this indication. It may be configured.

  In addition, many of the parts constituting the entire suction tool body 31 have a shape such as ribs, and if the interval between the ribs is narrow, stress concentration tends to occur at the base of the ribs when subjected to an impact. In addition, the member constituting the portion where the rib interval or the like is narrow may be constituted by the polyolefin resin composition according to the present disclosure.

  The present disclosure also includes a vacuum cleaner including a polyolefin resin molded body such as a suction tool.

  The specific configuration of the vacuum cleaner according to the present disclosure is not particularly limited, and various types of vacuum cleaners can be cited. Typical examples include a paper pack type canister type vacuum cleaner as shown in FIG. 4 or a cyclone type canister type vacuum cleaner 20 as shown in FIG.

  FIG. 4 is an overall perspective view of a paper pack type vacuum cleaner including the polyolefin resin molding of the present invention.

  In FIG. 4, a paper pack type canister type vacuum cleaner 10 includes a cleaner body 11, a hose 12, a gripping portion 13, a hand operating portion 14, an extension tube 15, the above-described suction tool 30, and the like. Yes. The cleaner body 11 includes an electric blower and a paper pack type dust collection chamber (not shown) inside, and a pair of wheels 16 on both sides. Moreover, the rear part of the cleaner body 11 is provided with a power cord (not shown) so as to be housed inside.

One end of the hose 12 is detachably connected to the front portion of the cleaner body 11, and the other end of the hose 12 is detachably connected to one end of the extension pipe 15. Moreover, the suction tool 30 is detachably connected to the other end of the extension pipe 15. The extension pipe 15 is configured to be extendable. A hand operating part 14 is provided on the upper surface of the other end of the hose 12, and a grip part 13 for gripping the other end of the hose 12 is provided in the vicinity of the hand operating part 14.

  By operating the electric blower in the cleaner body 11, a suction force is generated from one end of the hose 12 toward the cleaner body 11. Therefore, suction force is also generated in the inside of the hose 12 connected to the cleaner body 11, the inside of the extension pipe 15, and the suction port (not shown) of the suction tool 30. The cleaner body 11 is movable on the surface to be cleaned by a pair of wheels 16.

  When using the vacuum cleaner 10, first, the user pulls out a power cord (not shown) from the cleaner body 11, inserts a power plug at the tip into the power inlet, grips the grip portion 13, and moves the hand operating portion 14. Operate and turn on the vacuum cleaner body 11. As a result, the electric blower operates and a suction force is generated at the suction port of the suction tool 30, so that the user grips the grip portion 13 and moves the cleaner body 11 as necessary on the surface to be cleaned. By moving the suction tool 30, the dust on the surface to be cleaned can be sucked. The dust sucked from the suction tool 30 is collected in a paper pack type dust collecting chamber in the cleaner body 11 through the extension pipe 15 and the hose 12.

  FIG. 5 is an overall perspective view of a cyclone type electric vacuum cleaner including the polyolefin resin molding of the present invention.

  In FIG. 5, the electric vacuum cleaner 20 includes a cleaner main body 21, a hose 22, a gripping part 23, a hand operating part 24, an extension pipe 25, a suction tool 30, and the like. The vacuum cleaner main body 21 has a built-in electric blower 27 at the rear, and a dust collection container storage (not shown) for storing a dust collection container 28 that is detachably attached to the front and separates and collects dust.

  One end of the hose 22 is detachably connected to the front portion of the cleaner body 21, and the other end of the hose 22 is detachably connected to one end of the extension pipe 25. A suction tool 30 is detachably connected to the other end of the extension pipe 25. The extension tube 25 is configured to be extendable. A hand operation part 24 is provided on the upper surface of the other end of the hose 22, and a grip part 23 for gripping the other end of the hose 22 is provided in the vicinity of the hand operation part 24.

  By operating the electric blower in the cleaner body 21, a suction force is generated from one end of the hose 22 toward the dust collecting container 28 in the cleaner body 11. Therefore, a suction force is also generated in the hose 22 connected to the cleaner body 21, the extension pipe 25, and the suction port (not shown) of the suction tool 30. The cleaner body 21 is movable on the surface to be cleaned by a pair of wheels 26.

  When using the electric vacuum cleaner 20, first, the user pulls out a power cord (not shown) from the main body 21 of the vacuum cleaner, inserts the power plug at the tip into the power outlet, holds the grip portion 23, and moves the hand operating portion 24. Operate and turn on the vacuum cleaner body 21. Thereby, since the electric blower 27 operates and suction force is generated at the suction port of the suction tool 30, the user grips the grip portion 23 and moves the cleaner main body 21 as necessary to move the surface to be cleaned. By moving the suction tool 30 above, dust on the surface to be cleaned can be sucked. The dust sucked in from the suction tool 30 is collected in the dust collecting container 28 in the dust collecting container storage part located in the front part of the cleaner body 21 through the extension pipe 25 and the hose 22.

  The concrete configuration of the paper pack type canister type vacuum cleaner 10 shown in FIG. 4 or the cyclone type canister type vacuum cleaner 20 shown in FIG. 5, that is, the vacuum cleaner body 11 or 21, the hose. There are no particular limitations on the specific configuration of 12 or 22, the gripping portion 13 or 23, the hand operating portion 14 or 24, the extension tube 15 or 25, and various types of configurations known in the field of vacuum cleaners are preferably used. it can.

  As described above, the polyolefin resin composition according to the present disclosure has (B) a hollow member, (C) an elastomer component, and (D) a modified polyolefin resin with respect to (A) a polyolefin resin that is a matrix material (matrix). (B) The mixing of the hollow member makes it possible to reduce the weight of the polyolefin resin composition, but (D) the modified part of the modified polyolefin resin is fixed to (B) a part of the hollow member, and (D) the modified The polyolefin part of the polyolefin resin is compatible with the (A) polyolefin resin, improves the strength of the polyolefin resin composition, and the interface between the modified part and the unreacted part slips. Further, (C) the elastomer component is (B) By combining with a hollow member, the impact resistance is drastically improved, so that a resin molded body made of a polyolefin resin composition has toughness. A resin molded body. Therefore, even if an impact is applied to the resin molded body composed of this polyolefin resin composition, the possibility of cracking is greatly reduced not only on the flat surface but also on the structure where stress such as rib roots is concentrated. can do.

  Further, since the adhesion between the materials is high and the surface hardness can be improved, it is possible to improve the surface scratching and abrasion resistance.

  As a result, the resin molded body using this polyolefin resin composition can achieve excellent impact resistance and surface hardness while realizing good weight reduction, and particularly, impact resistance and surface It can be suitably used as a part for household electrical appliances that are difficult to cut.

  The present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to this. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of the present invention. In addition, measurement / evaluation of physical properties and the like in the following examples and comparative examples were performed as follows.

(Measurement and evaluation method)
[True density]
The sample plate obtained in the example or the comparative example was measured using a true density meter (trade name: MD-300S, manufactured by Alpha Mirage).

[Impact resistance test]
The sample plate obtained in the example or the comparative example was left still in a thermostatic bath (trade name: PDR-3KP, manufactured by ESPEC Corp.) and held at −10 ° C. for 3 hours. Thereafter, the sample plate was quickly taken out from the thermostat, and the maximum height at which the sample plate was not broken when the 250 g weight was dropped was measured from various heights. In addition, assuming a rib, the sample plate was placed on a pedestal with an interval of 30 mm and evaluated.

  In this impact resistance test, the larger the maximum height value, the higher the impact resistance of the sample plate. In Tables 1 and 2 described later, the numerical value of the maximum height is divided into three stages, and the impact resistance is evaluated depending on which stage the numerical value enters. If the maximum height is less than 40 cm, it is evaluated as “x” because the impact resistance is low, and if the maximum height is 40 cm or more and 80 cm or less, it is evaluated as “△” because the impact resistance is slightly low. If the height exceeded 80 cm, the impact resistance was high, and “◯” was evaluated.

[Pencil hardness test]
The pencil hardness was measured with reference to the pencil scratch test JIS K 5400, and a uni pencil made by Mitsubishi Pencil was used as the pencil. The measurement conditions were a sample stage moving speed of 30 mm / min and a load of 1.00 kg. Hardness of 4B or less was evaluated as “x”, and 3B or higher was evaluated as “◯”.

Example 1
(A) Polypropylene (Nippon Polypro, trade name: BC03B) is used as the polyolefin resin, (B) Hollow glass (trade name: Glass Bubbles iM16K, made by 3M) is used as the hollow member, and (C) Elastomer SEBS (manufactured by Asahi Kasei Corporation, trade name: H1062) was used as a component, and maleic acid-modified polypropylene (manufactured by Riken Vitamin Co., trade name: Riqueid MG400W) was used as the (D) modified polyolefin resin.

  Each component was mixed in a premixed container prepared in advance so that the weight ratio was 82% by weight of polypropylene, 10% by weight of hollow glass, 5% by weight of SEBS, and 3% by weight of maleic acid-modified polypropylene, and stirred uniformly. Each component was premixed. Thereafter, the mixture was put into a twin screw extruder, and the mixture was kneaded while heating to granulate pellets (that is, the polyolefin resin composition of Example 1). The cylinder temperature of the twin screw extruder was set to 200 ° C. The obtained pellets were molded into a 70 mm × 60 mm × 1.6 mm sample plate (polyolefin resin molded body of Example 1) with an injection molding machine. The injection molding conditions were a molding temperature of 200 ° C. and a mold temperature of 40 ° C.

  The composition of the obtained sample plate was 82% by weight of component (A), 10% by weight of component (B), 5% by weight of component (C), and 3% by weight of component (D). Thus, the true density was measured and the impact resistance and pencil hardness were evaluated. The results are shown in Table 1.

(Example 2)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) The polyolefin resin composition (pellet) of Example 2 and the same as Example 1 except that the weight ratio was 89.5% by weight, 5% by weight, 5% by weight, and 0.5% by weight, respectively. A polyolefin resin molded body (sample plate) of Example 2 was obtained.

  The composition of the obtained sample plate was (A) component 89.5% by weight, (B) component 5% by weight, (C) component 5% by weight, and (D) component 0.5% by weight. As described above, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Example 3)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) The polyolefin resin composition (pellet) of Example 3 and Example 3 were the same as Example 1 except that the weight ratio was 80% by weight, 5% by weight, 5% by weight, and 10% by weight, respectively. A polyolefin resin molded body (sample plate) was obtained.

  The composition of the obtained sample plate was (A) component 80% by weight, (B) component 5% by weight, (C) component 5% by weight, and (D) component 10% by weight. Thus, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Example 4)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) Each weight ratio is 74.5 wt%
The polyolefin resin composition (pellet) of Example 4 and the polyolefin resin molded article of Example 4 (pellet) and Example 4 except that the content was 5% by weight, 20% by weight, and 0.5% by weight. Sample plate).

  The composition of the obtained sample plate was (A) component 74.5% by weight, (B) component 5% by weight, (C) component 20% by weight, and (D) component 0.5% by weight. As described above, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Example 5)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) The polyolefin resin composition (pellet) of Example 5 and Example 5 were the same as Example 1 except that the weight ratios were 65% by weight, 5% by weight, 20% by weight, and 10% by weight, respectively. A polyolefin resin molded body (sample plate) was obtained.

  The composition of the obtained sample plate was 65% by weight of component (A), 5% by weight of component (B), 20% by weight of component (C), and 10% by weight of component (D). Thus, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Example 6)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) Except for the weight ratios being 64.5 wt%, 30 wt%, 5 wt%, and 0.5 wt%, respectively, the polyolefin resin composition (pellet) of Example 6 and A polyolefin resin molded body (sample plate) of Example 6 was obtained.

  The composition of the obtained sample plate was (A) component 64.5% by weight, (B) component 30% by weight, (C) component 5% by weight, and (D) component 0.5% by weight. As described above, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Example 7)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) The polyolefin resin composition (pellet) of Example 7 and Example 7 were the same as Example 1 except that the weight ratios were 55%, 30%, 5%, and 10% by weight, respectively. A polyolefin resin molded body (sample plate) was obtained.

  The composition of the sample plate obtained was 55% by weight of component (A), 30% by weight of component (B), 5% by weight of component (C), and 10% by weight of component (D). Thus, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Example 8)
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) Each weight ratio is 49.5 wt%
, 30 wt%, 20 wt%, and 0.5 wt%, in the same manner as in Example 1 above, the polyolefin resin composition (pellet) of Example 8 and the polyolefin resin molded article of Example 8 ( Sample plate).

  The composition of the obtained sample plate was (A) component 49.5% by weight, (B) component 30% by weight, (C) component 20% by weight, and (D) component 0.5% by weight. As described above, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

Example 9
(A) Polypropylene which is a polyolefin resin, (B) Hollow glass which is a hollow member, (C) SEBS which is an elastomer component, and (D) Maleic acid-modified polypropylene which is a modified polyolefin resin component (content) The polyolefin resin composition (pellet) of Example 9 and Example 9 were the same as Example 1 except that the weight ratio was 40% by weight, 30% by weight, 20% by weight, and 10% by weight, respectively. A polyolefin resin molded body (sample plate) was obtained.

  The composition of the obtained sample plate was (A) component 40% by weight, (B) component 30% by weight, (C) component 20% by weight, and (D) component 10% by weight. Thus, the true density was measured and the impact resistance was evaluated. The results are shown in Table 1.

(Comparative Example 1)
(A) Polypropylene that is a polyolefin resin and (B) hollow glass that is a hollow member are blended so as to have a weight ratio of 90% by weight and 10% by weight, respectively, and (C) an elastomer component and (D) a modified polyolefin resin. The polyolefin resin composition (pellet) of Comparative Example 1 and the polyolefin resin molded body (sample plate) of Comparative Example 1 were obtained in the same manner as in Example 1 except that was not blended.

  The composition of the obtained sample plate is (A) component 90% by weight, (B) component 10% by weight, (C) component 0% by weight, and (D) component 0% by weight. As described above, this sample plate was measured for true density and evaluated for impact resistance. The results are shown in Table 1.

(Comparative Example 2)
(A) Polypropylene resin, which is 86.8% by weight, (B) Hollow glass, which is a hollow member, 10% by weight, (D) Maleic acid-modified polypropylene, which is a modified polyolefin resin component, is 3% by weight. Each component was blended so as to be. Further, 0.2 wt% of a silane coupling agent (manufactured by Shin-Etsu Silicone Co., Ltd., trade name: KBM603) is dissolved in a toluene solvent, and (B) the hollow glass as a hollow member is immersed, removed after the solvent is removed, and dried. Used for kneading. (C) The polyolefin resin composition (pellet) of Comparative Example 2 and Comparative Example were the same as Example 1 except that the elastomer component was not blended and the surface coating step of the silane coupling agent to the hollow glass was performed. 2 polyolefin resin molded body (sample plate) was obtained.

  The composition of the obtained sample plate was (A) component 86.8% by weight, (B) component 10% by weight, (C) component 0% by weight, (D) component 3% by weight, silane coupling agent 0.2. % By weight. As described above, this sample plate was measured for true density and evaluated for impact resistance. The results are shown in Table 1.

(Comparative Example 3)
(A) 81.8% by weight of polypropylene as a polyolefin resin, (B) 10% by weight of hollow glass as a hollow member, (C) 5% by weight of SEBS as an elastomer component, (D) Malee as a modified polyolefin resin component Each component was mix | blended so that it might become a weight ratio of 3 weight% of acid-modified polypropylene. Further, 0.2 wt% of a silane coupling agent (manufactured by Shin-Etsu Silicone Co., Ltd., trade name: KBM603) is dissolved in a toluene solvent, and (B) the hollow glass as a hollow member is immersed, removed after the solvent is removed, and dried. Used for kneading. A polyolefin resin composition (pellet) of Comparative Example 3 and a polyolefin resin molded body (sample plate) of Comparative Example 3 were obtained in the same manner as in Example 1 except for the surface application step of the silane coupling agent to the hollow glass. It was.

  The composition of the obtained sample plate was (A) component 81.8% by weight, (B) component 10% by weight, (C) component 5% by weight, (D) component 3% by weight, silane coupling agent 0.2. % By weight. As described above, this sample plate was measured for true density and evaluated for impact resistance. The results are shown in Table 1.

(Comparative Example 4)
(A) 85% by weight of polypropylene, which is a polyolefin resin, (B) 10% by weight of hollow glass, which is a hollow member, and (C) 5% by weight of each elastomer component, In the same manner as in Example 1 except that (D) the modified polyolefin resin component was not blended, the polyolefin resin composition (pellet) of Comparative Example 4 and the polyolefin resin molded article of Comparative Example 4 (sample plate) )

  The composition of the obtained sample plate is (A) component 85% by weight, (B) component 10% by weight, (C) component 5% by weight, and (D) component 0% by weight. As described above, this sample plate was measured for true density and evaluated for impact resistance. The results are shown in Table 1.

(Contrast of Examples 1-9 and Comparative Examples 1-4)
As is clear from the results in Table 1, if (B) hollow glass, which is a hollow member, is added to (A) polypropylene, which is a polyolefin resin, the amount added in any of the examples and comparative examples. The density is reduced accordingly. Therefore, it can be understood that the hollow glass is prevented from being broken during the molding of the sample plate, and the weight reduction of the resin molded body can be realized.

Here, in Examples 1 to 5, the sample plates all show good impact resistance, but in Comparative Examples 1 and 3, the impact resistance of the sample plate is somewhat inferior, and in Comparative Example 2,
The impact resistance of the sample plate was clearly reduced.

  Comparative Example 1 does not contain (C) an elastomer component and (D) a modified polyolefin resin component. Therefore, in the present disclosure, it is difficult to improve the impact resistance even if it is possible to reduce the weight of the polyolefin resin molded body by using only the (A) polyolefin resin and the (B) hollow member. I understand that there is.

  Further, in Comparative Example 2, (C) the elastomer component is not included, but instead, a silane coupling agent is included as a hollow member affinity component that significantly improves the affinity of the surface of the hollow member. Therefore, since the affinity of (B) the surface of the hollow member for (A) polyolefin resin is remarkably improved, the adhesion of (B) hollow member to (A) polyolefin resin as a matrix material is remarkably increased ( Patent Document 1). As a result, when an impact is applied to the sample plate, cracks are likely to occur at the interface between (A) the polyolefin resin and (B) the hollow member, and it is considered that the impact resistance is reduced.

  Furthermore, in Comparative Example 3, Comparative Example 2 contains (C) an elastomer component. Although (C) the elastomer component is included, the affinity for (B) the polyolefin resin on the surface of (B) the hollow member is remarkably improved.

  Finally, in Comparative Example 4, (D) the modified polyolefin resin is not included, but (C) the elastomer component is included. (B) Since the affinity for (A) polyolefin resin on the surface of the hollow member is low, the adhesion of (B) hollow member to (A) polyolefin resin which is a matrix material is low. Furthermore, because (C) the elastomer component is included, even if an impact is applied, the interface of (B) the hollow member becomes slippery, and (B) the possibility of cracking the resin molded body starting from the hollow member is greatly reduced. can do. However, it is considered that (A) the hardness of the hollow member (B) with respect to the polyolefin resin is low, so that the surface hardness is low.

  On the other hand, in Examples 1-9, (D) modified polyolefin resin is included in addition to the (C) elastomer component.

  (D) The modified portion of the modified polyolefin resin adheres to a part of the (B) hollow member, and the polyolefin portion of the (D) modified polyolefin resin is compatible with the (A) polyolefin resin, improving the strength of the polyolefin resin composition. In addition, the interface between the modified portion and the unreacted portion slips, and (C) the elastomer component is combined with the (B) hollow member to dramatically improve the impact resistance. The resulting resin molded body is a tough resin molded body. Therefore, even if an impact is applied to the resin molded body composed of this polyolefin resin composition, the possibility of cracking is greatly reduced not only on the flat surface but also on the structure where stress such as rib roots is concentrated. I think you can.

  In addition, since the adhesion between materials is high and the surface hardness can be improved, it is considered possible to improve the resistance to scratching and scraping of the surface.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

The polyolefin resin composition according to the present invention can be suitably used for the production of a polyolefin resin molded article having excellent impact resistance while realizing a good weight reduction. By constituting, it is possible to provide a vacuum cleaner that is lightweight and has excellent impact resistance and surface hardness, and can be applied to various vacuum cleaners.

DESCRIPTION OF SYMBOLS 10, 20 Vacuum cleaner 11, 21 Vacuum cleaner main body 12, 22 Hose 13, 23 Grip part 14, 24 Hand operation part 15, 25 Extension pipe 16, 26 Wheel 27 Electric blower 28 Dust collection container 30 Suction tool 31 Suction tool main body 32 Movable part 33 Connecting pipe part 50 Polyolefin resin composition 51 (A) Polyolefin resin 52 (B) Hollow member 53 (C) Elastomer component 54 (D) Modified polyolefin resin 61 Adhesive surface

Claims (10)

  (A) a polyolefin resin, a particulate (B) hollow member, (C) an elastomer component, and (D) a modified polyolefin resin. The surface of the (B) hollow member is the (A) polyolefin resin. A polyolefin resin composition characterized by not containing a hollow member affinity component that has a non-affinity for the resin and further improves the affinity of the surface of the (B) hollow member for the (A) polyolefin resin.   The (D) modified polyolefin resin has a structure having (B) a modified group having a high affinity with the hollow member and (A) a polyolefin resin portion having a high affinity with the polyolefin resin. Polyolefin resin composition.   When the total weight of (B) hollow member, (A) polyolefin resin, (C) elastomer component, and (D) modified polyolefin resin is 100% by weight, the content of (B) hollow member is 1-50. The content of the (C) elastomer component is 1 to 20% by weight, and the content of the (D) modified polyolefin resin component is 0.5 to 15%. Item 3. The polyolefin resin composition according to Item 1 or 2.   The polyolefin resin according to any one of claims 1 to 3, wherein (B) the hollow member is made of glass, and (D) the modified polyolefin resin has an acid-modified or amine-modified functional group. Composition.   5. The polyolefin resin composition according to claim 1, wherein the elastomer component is at least one styrenic elastomer selected from the group consisting of SEBS, SEPS, and SEB. .   (A) Polyolefin resin composition of any one of Claims 1-5, wherein the polyolefin resin is at least polypropylene.   (A) The polyolefin resin is composed of one having a water contact angle θ in the range of 85 to 100 °, and (B) the surface of the hollow member has a water contact angle θ in the range of 0 to 10 °. It is, The polyolefin resin composition of any one of Claims 1-6 characterized by the above-mentioned.   A polyolefin resin molded article, which is a part for home electric appliances comprising at least the polyolefin resin composition according to any one of claims 1 to 7.   The polyolefin resin molded article according to claim 8, wherein the home appliance component is a vacuum cleaner suction tool.   A vacuum cleaner comprising a part formed of the polyolefin resin molded body according to claim 8 or 9.

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