WO2021199838A1 - ポリプロピレン樹脂組成物、ポリプロピレン樹脂組成物の製造方法、および成形体 - Google Patents
ポリプロピレン樹脂組成物、ポリプロピレン樹脂組成物の製造方法、および成形体 Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/04—Monomers containing three or four carbon atoms
- C08F10/06—Propene
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
- C08F222/06—Maleic anhydride
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/08—Oxygen-containing compounds
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- C08L101/00—Compositions of unspecified macromolecular compounds
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
- C08K2003/3063—Magnesium sulfate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Definitions
- the present invention relates to a polypropylene resin composition, a method for producing a polypropylene resin composition, and a molded product.
- Basic magnesium sulfate is widely used as a filler for polypropylene resin and the like.
- As the basic magnesium sulfate for example, fibrous basic magnesium sulfate having improved acid resistance by treating with two types of surfactants, anionic and cationic, has been proposed (see, for example, Patent Document 1). .. It is described that the resin composition containing the fibrous basic magnesium sulfate can suppress the generation of blisters.
- a propylene resin composition containing a propylene polymer, a modified olefin polymer, a non-fibrous inorganic filler and an elastomer together with basic magnesium sulfate as a fibrous inorganic filler has been proposed (for example, Patent Documents). 3). It is described that by using this resin composition, a molded product having an excellent balance of appearance, rigidity and impact resistance, and impact resistance and heat resistance can be obtained.
- basic magnesium sulfate is used as a filler in order to improve physical characteristics such as FM (flexural modulus) and impact strength of polypropylene resin, and the resin composition is used for members of automobiles and the like. ..
- FM flexible modulus
- the resin composition is used for members of automobiles and the like. ..
- an exterior material such as a bumper exposed to rainwater, it is required to suppress the generation of blisters and to have sufficient mechanical properties so that the appearance of the paint is not impaired.
- the polypropylene resin composition according to the present invention comprises 1 to 41 parts by mass of fibrous basic magnesium sulfate, 50 to 98 parts by mass of a propylene polymer, 0.02 to 1.6 parts by mass of a lubricant, and the basicity. It contains less than 0.5 times the amount of magnesium sulfate and 0.1 to 20 parts by mass of an acid-modified polymer.
- the method for producing a polypropylene resin composition according to the present invention includes 1 to 41 parts by mass of fibrous basic magnesium sulfate, 50 to 98 parts by mass of a propylene polymer, 0.02 to 1.6 parts by mass of a lubricant, and It includes mixing less than 0.5 times the amount of the basic magnesium sulfate compounded and 0.1 to 20 parts by mass of the acid-modified polymer, and then melt-kneading.
- the molded product according to the present invention is a molded product of the polypropylene resin composition described above.
- the present invention it is possible to provide a polypropylene resin composition in which the generation of blisters is suppressed and a molded product having sufficient mechanical properties can be obtained, and a method for producing the polypropylene resin composition. Further, according to the present invention, it is possible to provide a molded product in which the generation of blisters is suppressed and the molded product has sufficient mechanical properties.
- the present inventor has conducted diligent research to generate blister of a molded product obtained by blending a predetermined amount of an acid-modified elastomer with a polypropylene resin composition containing fibrous basic magnesium sulfate, a propylene polymer and a lubricant. It was found that it can be suppressed and the mechanical properties are improved.
- embodiments of the present invention will be described in detail.
- Basic magnesium sulfate is represented by MgSO 4 ⁇ 5Mg (OH) 2 ⁇ 3H 2 O, for example, sodium hydroxide, magnesium hydroxide, magnesium oxide, as raw materials and an alkaline substance and magnesium sulfate, such as calcium hydroxide, It can be obtained by hydrothermal synthesis.
- the basic magnesium sulfate either fibrous basic magnesium sulfate or fan-like basic magnesium sulfate may be used, but fibrous basic magnesium sulfate is particularly preferable.
- the fibrous basic magnesium sulfate has an average fiber length generally in the range of 2 to 100 ⁇ m, preferably 5 to 50 ⁇ m, and an average fiber diameter of generally 0.1 to 2.0 ⁇ m, preferably 0.1 to 1.0 ⁇ m. The range.
- the fibrous basic magnesium sulfate generally has an average aspect ratio (average fiber length / average fiber diameter) of 2 or more, preferably 3 to 1000, more preferably 3 to 100, and particularly preferably 5 to 50.
- the average fiber length and average fiber diameter of fibrous basic magnesium sulfate can be calculated from the average number of each of the fiber length and fiber diameter measured by image analysis from a magnified image by a scanning electron microscope (SEM). can.
- the fan-shaped basic magnesium sulfate is a particle in which a part of a plurality of fibrous basic magnesium sulfate is joined and connected in a fan shape.
- the average particle length is 2 to 100 ⁇ m
- the average particle width is 1 to 40 ⁇ m
- the average aspect ratio is. It is about 1 to 100.
- the average particle length refers to the dimension in the longitudinal direction of the particle
- the average particle width refers to the maximum dimension in the lateral direction of the particle.
- the longitudinal direction of the particles is the direction in which the particle length is maximized
- the lateral direction of the particles is the direction orthogonal to the longitudinal direction.
- the average aspect ratio is a ratio (average particle length / average particle diameter).
- Each fibrous basic magnesium sulfate constituting the fan-shaped basic magnesium sulfate has an average fiber length of 2 to 100 ⁇ m, an average fiber diameter of 0.1 to 5 ⁇ m, and an average aspect ratio of 1 to 1000.
- the plurality of fibrous basic magnesium sulfates are bundled at one end and spread at the other end, for example. Further, the plurality of fibrous basic magnesium sulfates may be bundled at an arbitrary position in the longitudinal direction and have spreads at both ends.
- Such fan-shaped basic magnesium sulfate can be produced and confirmed according to the methods described in, for example, Japanese Patent Publication No. 4-36092 and Japanese Patent Publication No. 6-99147.
- the fan-shaped basic magnesium sulfate does not necessarily have to be in a state in which individual fibrous basic magnesium sulfates are confirmed, and in some cases, fibrous basic magnesium sulfates are bonded to each other in the longitudinal direction. May be good. If it is confirmed that the fibrous basic magnesium sulfate having the above-mentioned shape and further having an average fiber length, an average fiber diameter, and an average aspect ratio in a predetermined range is contained, the fan-shaped base used in the present invention is used. It can be regarded as magnesium sulfate.
- the blending amount of basic magnesium sulfate is 1 to 41 parts by mass.
- the blending amount of basic magnesium sulfate is preferably 2 to 30 parts by mass, more preferably 3 to 20 parts by mass.
- a propylene homopolymer or a propylene copolymer can be used as the propylene polymer.
- a propylene block copolymer is more desirable as a propylene polymer because of its high impact resistance.
- the blending amount of the propylene polymer is 50 to 98 parts by mass.
- the blending amount of the propylene polymer is preferably 50 to 90 parts by mass, more preferably 55 to 85 parts by mass.
- the lubricant can be selected from fatty acids and fatty acid metal salts.
- fatty acid saturated fatty acid is preferable, and examples thereof include stearic acid.
- fatty acid metal salt include magnesium stearate, calcium stearate, and aluminum stearate.
- the blending amount of the lubricant is 0.02 to 1.6 parts by mass.
- the blending amount of the lubricant is preferably 0.04 to 1.2 parts by mass, more preferably 0.06 to 0.8 parts by mass.
- the acid-modified elastomer is preferably maleic anhydride-modified elastomer, and specific examples thereof include maleic anhydride-modified styrene-ethylene-butylene-styrene (SEBS).
- SEBS maleic anhydride-modified styrene-ethylene-butylene-styrene
- the ratio (S / EB) of styrene (S) to ethylene-butylene (EB) in SEBS is preferably about 10/90 to 50/50, more preferably about 20/80 to 40/60.
- the acid-modified elastomer preferably has a grafting rate of about 1.0 to 10.0%.
- the grafting rate can be calculated by the following method. First, the acid-modified elastomer is dissolved in xylene and then reprecipitated in acetone to remove impurities. Then, the maleic anhydride portion of the graft is methyl esterified, and 1 H-NMR measurement is performed after the methyl esterification. 1 H peak area of the spectrum obtained by using, can be obtained grafting ratio.
- the grafting rate is more preferably about 1.0 to 5.0%.
- the blending amount of the acid-modified elastomer is less than 0.5 times the blending amount of basic magnesium sulfate, and is 0.1 to 20 parts by mass.
- the blending amount of the acid-modified elastomer is preferably about 0.05 to 0.5 times, more preferably about 0.1 to 0.3 times the blending amount of the basic magnesium sulfate. Further, 0.1 to 15 parts by mass is preferable, and 0.2 to 10 parts by mass is more preferable.
- the polypropylene resin composition of the present invention may contain 40 parts by mass or less of an elastomer.
- the elastomer include an ethylene- ⁇ -olefin copolymer-based elastomer and a styrene-based elastomer.
- One type of elastomer may be used alone, or two or more types may be used in combination.
- Specific examples of the ethylene- ⁇ -olefin copolymer elastomer include ethylene-propylene copolymer (EPR), ethylene-1-butylene copolymer (EBR), ethylene-1-octene copolymer (EOR), and ethylene.
- EPDM Ethylene-propylene-1-butylene copolymer
- EPBR Ethylene-propylene-1-butylene copolymer
- EBDM Ethylene-1-butylene-Non-conjugated diene copolymer
- EPBDM Ethylene-propylene-1-butylene -Non-conjugated diene copolymerized elastomer
- styrene-based elastomer examples include styrene-butadiene block copolymer elastomer (SBR), styrene-butadiene-styrene block copolymer elastomer (SBS), styrene-isoprene-styrene block copolymer elastomer (SIS), and styrene-ethylene-.
- SBR styrene-butadiene block copolymer elastomer
- SBS styrene-butadiene-styrene block copolymer elastomer
- SIS styrene-isoprene-styrene block copolymer elastomer
- styrene-ethylene- examples include styrene-ethylene block copolymer elastomer (SBR), styrene-butadiene-styrene block
- block copolymers such as butylene-styrene block copolymer elastomer (SEBS) and styrene-ethylene-propylene-styrene block copolymer elastomer (SEPS), and block copolymers obtained by hydrogenating these elastomers. ..
- SEBS butylene-styrene block copolymer elastomer
- SEPS styrene-ethylene-propylene-styrene block copolymer elastomer
- the blending amount of the elastomer is preferably 5 to 35 parts by mass, more preferably 10 to 30 parts by mass.
- the inclusion of the elastomer further enhances the impact resistance and does not impair the effectiveness of the present invention.
- An olefin-based elastomer may be used as the elastomer.
- the polypropylene resin composition of the present invention may contain a non-fibrous filler.
- non-fibrous fillers include talc, mica, calcium carbonate, barium sulfate, magnesium carbonate, clay, alumina, silica, calcium sulfate, silica sand, carbon black, titanium oxide, magnesium hydroxide, zeolite, molybdenum, and silica. So soil, sericite, silas, calcium hydroxide, calcium sulfite, sodium sulfate, bentonite, graphite and the like can be mentioned, with talc being particularly preferred.
- the non-fibrous filler up to 40 parts by mass, it is possible to obtain a molded product having better impact strength, gloss, appearance and the like.
- components can be added to the polypropylene resin composition of the present invention as long as the effects of the present invention are not impaired.
- Other components include, for example, antioxidants, UV absorbers, pigments, antistatic agents, copper damage inhibitors, flame retardants, neutralizers, foaming agents, plasticizers, nucleating agents, anti-bubble agents, cross-linking agents. And so on.
- ⁇ Manufacturing method of polypropylene resin composition In producing the polypropylene resin composition of the present invention, first, basic magnesium sulfate, a propylene polymer, a lubricant, and an acid-modified elastomer are mixed in a predetermined blending amount.
- the blending amount of each component is 1 to 41 parts by mass of basic magnesium sulfate, 50 to 98 parts by mass of propylene polymer, and 0.02 to 1.6 parts by mass of lubricant.
- the blending amount of the acid-modified elastomer is less than 0.5 times the blending amount of basic magnesium sulfate, and is 0.1 to 20 parts by mass.
- a tumbler, a blender, a Henschel mixer or the like can be used for mixing.
- the polypropylene resin composition of the present invention can be obtained by melt-kneading the obtained mixture at 180 to 250 ° C. using a twin-screw kneader or the like.
- the molded product of the present invention can be produced by molding the polypropylene resin composition of the present invention.
- a molding machine such as a rolling molding machine (calendar molding machine or the like), a vacuum molding machine, an extrusion molding machine, an injection molding machine, a blow molding machine, a press molding machine or the like can be used.
- the resin composition of the present invention contains the acid-modified elastomer in a predetermined blending amount, the generation of blister is suppressed, and a molded product having excellent flexural modulus and Charpy impact strength can be obtained. can.
- Example 1 First, 10 parts by mass of fibrous basic magnesium sulfate (A-1), 65 parts by mass of propylene polymer (B), 25 parts by mass of polyolefin elastomer (C), 0.3 parts by mass of fatty acid metal salt (E), and acid. 1 part by mass of the modified elastomer (F-1) was mixed. The obtained mixture was melt-kneaded using a twin-screw extrusion kneader (Laboplast Mill, manufactured by Toyo Seiki Seisakusho Co., Ltd.) to obtain the resin composition of Example 1.
- A-1 fibrous basic magnesium sulfate
- B propylene polymer
- C polyolefin elastomer
- E 0.3 parts by mass of fatty acid metal salt
- F-1 modified elastomer
- Example 2 The resin composition of Example 2 was obtained in the same manner as in Example 1 except that the blending amount of the acid-modified elastomer (F-1) was changed to 3 parts by mass.
- Example 3 The resin composition of Example 3 was obtained in the same manner as in Example 1 except that the acid-modified elastomer (F-1) was changed to the same amount (F-2).
- Example 4 The resin composition of Example 4 was obtained in the same manner as in Example 3 except that the blending amount of the acid-modified elastomer (F-2) was changed to 3 parts by mass.
- Comparative example 1 A resin composition of Comparative Example 1 was obtained in the same manner as in Example 1 except that the acid-modified elastomer (F-1) was not blended.
- Comparative example 2 A resin composition of Comparative Example 2 was obtained in the same manner as in Example 1 except that the blending amount of the acid-modified elastomer (F-1) was changed to 5 parts by mass.
- Comparative example 3 The resin composition of Comparative Example 3 was obtained in the same manner as in Example 3 except that the blending amount of the acid-modified elastomer (F-2) was changed to 5 parts by mass.
- Comparative example 4 The resin composition of Comparative Example 4 was obtained in the same manner as in Example 1 except that the acid-modified elastomer (F-1) was changed to the same amount of acid-modified polypropylene (F-3).
- Comparative example 5 The resin composition of Comparative Example 5 was obtained in the same manner as in Example 2 except that the acid-modified elastomer (F-1) was changed to the same amount of acid-modified polypropylene (F-3).
- Comparative Example 6 The resin composition of Comparative Example 6 was obtained in the same manner as in Comparative Example 2 except that the acid-modified elastomer (F-1) was changed to the same amount of acid-modified polypropylene (F-3).
- Comparative Examples 7 to 9 The resin compositions of Comparative Examples 7 to 9 were obtained in the same manner as in Comparative Examples 4 to 6 except that the acid-modified polypropylene (F-3) was changed to the same amount of acid-modified polypropylene (F-4).
- Comparative Examples 10 to 12 The resin compositions of Comparative Examples 10 to 12 were obtained in the same manner as in Comparative Examples 4 to 6 except that the acid-modified polypropylene (F-3) was changed to the same amount of acid-modified polypropylene (F-5).
- Table 1 summarizes the compounding compositions of the resin compositions of Examples and Comparative Examples.
- each resin composition is molded to a predetermined size, and a strip-shaped test piece (length 80 mm, width 10 mm, thickness) for evaluation of mechanical properties is used. 4 mm) and a flat plate type test piece for blister evaluation (length 40 mm, width 40 mm, thickness 1 mm) were obtained.
- test piece for blister evaluation On one side of the flat plate type test piece, apply primer (manufactured by Solar Co., Ltd., Pitaking 602ECO), base coat (manufactured by Nippon Paint Co., Ltd., Admira Alpha), and clear coat (manufactured by Nippon Paint Co., Ltd., hypoclear) in this order.
- primer manufactured by Solar Co., Ltd., Pitaking 602ECO
- base coat manufactured by Nippon Paint Co., Ltd., Admira Alpha
- clear coat manufactured by Nippon Paint Co., Ltd., hypoclear
- ⁇ Blister evaluation> The test piece for blister evaluation was immersed in 80 ° C. ion-exchanged water and allowed to stand for 48 hours. After the immersion, the test piece was dried, and the state of blister generation on the surface was observed with an optical microscope. The evaluation was made as follows based on the presence or absence of blisters having a diameter of 0.1 mm or more in an observation field of view of 4 cm 2. No blister: ⁇ Blister: ⁇
- Table 2 summarizes the evaluation results of the molded product using each resin composition together with the blister suppressing effect.
- the molded article using the resin compositions of Examples 1 to 4 containing a predetermined amount of maleic anhydride-modified SEBS suppresses the generation of blister and has a flexural modulus of 1.5 GPa or more. It has a modulus and a Charpy impact strength of 56 kJ / m 2 or more. That is, in the molded product of the example, both suppression of blisters and high mechanical strength are achieved.
- maleic anhydride-modified SEBS when maleic anhydride-modified SEBS is not contained (Comparative Example 1), blister cannot be suppressed.
- the blending amount of maleic anhydride-modified SEBS is 0.5 times the blending amount of basic magnesium sulfate (Comparative Examples 2 and 3), the flexural modulus remains at 1.1 GPa and the mechanical properties are inferior. ..
- maleic anhydride-modified polypropylene is blended instead of maleic anhydride-modified SEBS (Comparative Examples 4 to 12), it is not possible to achieve both suppression of blisters and high mechanical properties.
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Abstract
Description
以下、本発明の実施形態を詳細に説明する。
塩基性硫酸マグネシウムは、MgSO4・5Mg(OH)2・3H2Oで表され、例えば、水酸化ナトリウム、水酸化マグネシウム、酸化マグネシウム、水酸化カルシウムなどのアルカリ性物質と硫酸マグネシウムとを原料として、水熱合成により得ることができる。塩基性硫酸マグネシウムとしては、繊維状塩基性硫酸マグネシウムおよび扇状塩基性硫酸マグネシウムのいずれを用いてもよいが、繊維状塩基性硫酸マグネシウムが特に好ましい。
プロピレン重合体は、プロピレン単独重合体やプロピレン共重合体を用いることができる。耐衝撃強度が高い点で、プロピレンブロック共重合体がプロピレン重合体として、より望ましい。
滑剤は、脂肪酸および脂肪酸金属塩から選択することができる。脂肪酸としては、飽和脂肪酸が好ましく、例えばステアリン酸が挙げられる。脂肪酸金属塩としては、例えば、ステアリン酸マグネシウム、ステアリン酸カルシウム、およびステアリン酸アルミニウムなどが挙げられる。
滑剤の配合量は、0.02~1.6質量部である。滑剤の配合量は、0.04~1.2質量部が好ましく、0.06~0.8質量部がより好ましい。
酸変性エラストマーとしては、無水マレイン酸変性エラストマーが好ましく、具体的には、無水マレイン酸変性スチレン-エチレン-ブチレン-スチレン(SEBS)等が挙げられる。SEBSにおけるスチレン(S)とエチレン-ブチレン(EB)との比(S/EB)は、10/90~50/50程度が好ましく、20/80~40/60程度がより好ましい。
エチレン-α-オレフィン共重合系エラストマーの具体例としては、エチレン-プロピレン共重合エラストマー(EPR)、エチレン-1-ブチレン共重合エラストマー(EBR)、エチレン-1-オクテン共重合エラストマー(EOR)、エチレン-プロピレン-非共役ジエン共重合エラストマー(EPDM)、エチレン-プロピレン-1-ブチレン共重合エラストマー(EPBR)、エチレン-1-ブチレン-非共役ジエン共重合エラストマー(EBDM)及びエチレン-プロピレン-1-ブチレン-非共役ジエン共重合エラストマー(EPBDM)を挙げることができる。
本発明のポリプロピレン樹脂組成物の製造に当たっては、まず、塩基性硫酸マグネシウム、プロピレン重合体、滑剤、および酸変性エラストマーを所定の配合量で混合する。各成分の配合量は、塩基性硫酸マグネシウムが1~41質量部、プロピレン重合体が50~98質量部、滑剤が0.02~1.6質量部である。酸変性エラストマーの配合量は、塩基性硫酸マグネシウムの配合量の0.5倍未満、かつ0.1~20質量部である。混合には、タンブラー、ブレンダー、ヘンシェルミキサー等を用いることができる。
本発明の成形体は、本発明のポリプロピレン樹脂組成物を成形して製造することができる。成形には、例えば圧延成形機(カレンダー成形機など)、真空成形機、押出成形機、射出成形機、ブロー成形機、プレス成形機などの成形機を用いることができる。
<原料>
繊維状塩基性硫酸マグネシウム(A-1):モスハイジA-1、宇部マテリアルズ(株)製、平均長径15μm、平均短径0.5μm
プロピレン重合体(B):ポリプロピレンブロック重合体 プライムポリプロ J708UG、(株)プライムポリマー製
脂肪酸金属塩(E):ステアリン酸マグネシウム
無水マレイン酸変性SEBS(スチレン-エチレン-ブチレン-スチレン)、タフテックM1913、旭化成(株)製、スチレン:エチレン‐ブチレン=30:70、グラフト化率1.63%
酸変性エラストマー(F-2):
無水マレイン酸変性SEBS(スチレン-エチレン-ブチレン-スチレン)、タフテックM1943、旭化成(株)製、スチレン:エチレン-ブチレン=20:80、グラフト化率1.49%
酸変性ポリプロピレン(F-3):
無水マレイン酸変性ポリプロピレン、アドマーQF551、三井化学(株)製、グラフト化率0.08%
酸変性ポリプロピレン(F-4):
無水マレイン酸変性ポリプロピレン、トーヨータックPMA-H1000P、東洋紡(株)製、グラフト化率1.01%
酸変性ポリプロピレン(F-5):
無水マレイン酸変性ポリプロピレン、SCONA TPPP 2003 GB、ビックケミー・ジャパン(株)製、グラフト化率0.28%
なお、酸変性エラストマーと酸変性ポリプロピレン中のグラフト化率は、グラフト無水マレイン酸部をメチルエステル化し、1H-NMR測定より得られたスペクトルから算出した。
まず、繊維状塩基性硫酸マグネシウム(A-1)10質量部、プロピレン重合体(B)65質量部、ポリオレフィンエラストマー(C)25質量部、脂肪酸金属塩(E)0.3質量部、および酸変性エラストマー(F-1)1質量部を混合した。得られた混合物を二軸押出混練機((株)東洋精機製作所製、ラボプラストミル)を用いて溶融混練して、実施例1の樹脂組成物を得た。
酸変性エラストマー(F-1)の配合量を3質量部に変更した以外は実施例1と同様にして、実施例2の樹脂組成物を得た。
酸変性エラストマー(F-1)を同量の(F-2)に変更した以外は実施例1と同様にして、実施例3の樹脂組成物を得た。
酸変性エラストマー(F-2)の配合量を3質量部に変更した以外は実施例3と同様にして、実施例4の樹脂組成物を得た。
酸変性エラストマー(F-1)を配合しない以外は実施例1と同様にして、比較例1の樹脂組成物を得た。
酸変性エラストマー(F-1)の配合量を5質量部に変更した以外は実施例1と同様にして、比較例2の樹脂組成物を得た。
酸変性エラストマー(F-2)の配合量を5質量部に変更した以外は実施例3と同様にして、比較例3の樹脂組成物を得た。
酸変性エラストマー(F-1)を同量の酸変性ポリプロピレン(F-3)に変更した以外は実施例1と同様にして、比較例4の樹脂組成物を得た。
酸変性エラストマー(F-1)を同量の酸変性ポリプロピレン(F-3)に変更した以外は実施例2と同様にして、比較例5の樹脂組成物を得た。
酸変性エラストマー(F-1)を同量の酸変性ポリプロピレン(F-3)に変更した以外は比較例2と同様にして、比較例6の樹脂組成物を得た。
酸変性ポリプロピレン(F-3)を同量の酸変性ポリプロピレン(F-4)に変更した以外は比較例4~6と同様にして、比較例7~9の樹脂組成物を得た。
酸変性ポリプロピレン(F-3)を同量の酸変性ポリプロピレン(F-5)に変更した以外は比較例4~6と同様にして、比較例10~12の樹脂組成物を得た。
電動射出成形機(新興セルビック(株)製、C,Mobile)を用いて、各樹脂組成物を所定の寸法に成形して、力学物性評価用の短冊型試験片(縦80mm、横10mm、厚さ4mm)、およびブリスター評価用の平板型試験片(縦40mm、横40mm、厚さ1mm)を得た。
平板型試験片の片面に、プライマー((株)ソーラー製、ピタキング602ECO)、ベースコート(日本ペイント(株)製、アドミラアルファ)、クリアコート(日本ペイント(株)製、ハイポクリヤー)の順に塗装して、ブリスター評価用試験片を作製した。
ブリスター評価用試験片を80℃イオン交換水に浸漬し、48時間静置した。浸漬後、試験片を乾燥させて、表面のブリスター発生状況を光学顕微鏡により観察した。観察視野4cm2における直径0.1mm以上のブリスターの有無から、以下のように評価した。
ブリスター発生なし:〇
ブリスター発生:×
力学物性評価用の短冊型試験片を用いて、以下の手法により、曲げ弾性率およびシャルピー衝撃強度を測定した。
<曲げ弾性率の評価>
万能力学試験機((株)島津製作所製、AGS-x)を用いて、JIS K7171に準拠する方法で3点曲げ試験を行った。得られた荷重たわみ曲線から、曲げ弾性率を評価した。測定温度は23℃とした。
<シャルピー衝撃強度>
シャルピー衝撃試験機((株)マイズ試験機製)を用いて、JIS K7111に準拠する方法でノッチ付き衝撃強度を評価した。測定温度は23℃とした。
Claims (6)
- 1~41質量部の繊維状塩基性硫酸マグネシウム、
50~98質量部のプロピレン重合体、
0.02~1.6質量部の滑剤、および
前記繊維状塩基性硫酸マグネシウムの配合量の0.5倍未満、かつ0.1~20質量部の酸変性エラストマー
を含有するポリプロピレン樹脂組成物。 - 40質量部までのエラストマーをさらに含有する請求項1記載のポリプロピレン樹脂組成物。
- 40質量部までの非繊維状充填材をさらに含有する請求項1又は2記載のポリプロピレン樹脂組成物。
- 前記酸変性エラストマーは、無水マレイン酸変性エラストマーである請求項1~3のいずれか記載のポリプロピレン樹脂組成物。
- 1~41質量部の繊維状塩基性硫酸マグネシウム、50~98質量部のプロピレン重合体、0.02~1.6質量部の滑剤、および、前記塩基性硫酸マグネシウムの配合量の0.5倍未満、かつ0.1~20質量部の酸変性エラストマーを混合し、次いで溶融混練することを含むポリプロピレン樹脂組成物の製造方法。
- 請求項1~4のいずれか1項記載のポリプロピレン樹脂組成物の成形物である成形体。
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