Polyacetal resin composition, molded article, and method for producing polyacetal resin composition
阅读说明：本技术 聚缩醛树脂组合物、成型品及聚缩醛树脂组合物的制造方法 (Polyacetal resin composition, molded article, and method for producing polyacetal resin composition ) 是由 藤本邦彦 大岛麻希子 于 2018-06-05 设计创作，主要内容包括：本发明提供显示出优异的滑动特性、且不易发生鼓胀的聚缩醛树脂组合物、成型品及聚缩醛树脂组合物的制造方法。所述聚缩醛树脂组合物包含：(A)聚缩醛树脂100质量份、(B1)被有机硅化合物接枝而成的聚烯烃类树脂、(B2)未接枝的有机硅化合物、以及(C)聚烯烃类润滑剂0.5～1.8质量份,所述(B1)聚烯烃类树脂中的有机硅化合物的含量与(B2)未接枝的有机硅化合物的含量的总计相对于(A)聚缩醛树脂100质量份为0.6～2.5质量份,所述(B1)聚烯烃类树脂的含量与(B2)未接枝的有机硅化合物的含量的质量比(B1)/(B2)为68/32～45/55。(The invention provides a polyacetal resin composition, a molded article, and a method for producing the polyacetal resin composition, which exhibit excellent sliding characteristics and are less likely to swell. The polyacetal resin composition comprises: (A) 100 parts by mass of a polyacetal resin, (B1) a polyolefin resin grafted with an organosilicon compound, (B2) an ungrafted organosilicon compound, and (C) 0.5 to 1.8 parts by mass of a polyolefin lubricant, wherein the total of the content of the organosilicon compound in the polyolefin resin (B1) and the content of the ungrafted organosilicon compound (B2) is 0.6 to 2.5 parts by mass relative to 100 parts by mass of the polyacetal resin (A), and the mass ratio of the content of the polyolefin resin (B1) to the content of the ungrafted organosilicon compound (B2) (B1)/(B2) is 68/32 to 45/55.)
1, polyacetal resin compositions comprising:
(A) 100 parts by mass of a polyacetal resin,
(B1) Polyolefin resin grafted with an organic silicon compound,
(B2) An ungrafted organosilicon compound, and
(C) 0.5 to 1.8 parts by mass of a polyolefin lubricant,
the total of the content of the organosilicon compound in the polyolefin resin (B1) and the content of the ungrafted organosilicon compound (B2) is 0.6-2.5 parts by mass relative to 100 parts by mass of the polyacetal resin (A),
the mass ratio (B1)/(B2) of the content of the (B1) polyolefin resin to the content of the (B2) ungrafted organosilicon compound is 68/32-45/55.
2. The polyacetal resin composition according to claim 1, wherein the ratio (B1)/(B2) is 66/34 to 45/55.
3. The polyacetal resin composition according to claim 1 or 2, wherein the amount of the polyolefin-based lubricant (C) is 0.7 to 1.8 parts by mass per 100 parts by mass of the polyacetal resin (A).
4, kinds of molded articles, which is obtained by molding the polyacetal resin composition according to any of claims 1 to 3.
5. The molded article according to claim 4, which is a sliding member.
6. A method for producing the polyacetal resin composition according to any one of claims 1 to 3, comprising:
a master batch obtained by kneading the ungrafted silicone compound (B2) with the polyacetal resin (A), a polyacetal resin (A), and a polyolefin resin grafted with the silicone compound (B1) were melt-kneaded.
Technical Field
The present invention relates to a polyacetal resin composition, a molded article, and a method for producing a polyacetal resin composition. In particular, the present invention relates to a polyacetal resin composition suitable for use as a sliding member.
Background
For example, patent document 1 discloses polyoxymethylene resin compositions obtained by graft reaction of a silicone compound with (a) a polyoxymethylene resin and (B) a polyolefin resin, the polyoxymethylene resin composition comprising a polyolefin resin composition containing (B1) a polyolefin resin grafted with a silicone compound and (B2) a silicone compound, wherein the polyolefin resin composition has a graft ratio of the silicone compound to the polyolefin resin of 95 to 30 wt%, (B1) the polyolefin resin grafted with a silicone compound is 0.05 to 10 parts by weight, and (B1B 2) is 99/1 to 70/30 by weight, based on 100 parts by weight of (a) the polyoxymethylene resin.
Disclosure of Invention
Problems to be solved by the invention
The present inventors have made studies, however, and found that the resin composition may cause swelling of a molded article due to the blending ratio of the components, and the like, and that the resin composition is required to have excellent sliding properties.
Means for solving the problems
Based on the above problems, the present inventors have conducted studies and as a result, have solved the above problems by < 1 > and preferably by < 2 > to < 6 > in the following manner.
< 1 > polyacetal resin compositions comprising (A) 100 parts by mass of a polyacetal resin, (B1) a polyolefin resin grafted with an organosilicon compound, (B2) an ungrafted organosilicon compound, and (C) 0.5 to 1.8 parts by mass of a polyolefin lubricant,
the total of the content of the organosilicon compound in the (B1) polyolefin resin and the content of the ungrafted organosilicon compound (B2) is 0.6-2.5 parts by mass relative to 100 parts by mass of the polyacetal resin (A), and the mass ratio of the content of the (B1) polyolefin resin to the content of the ungrafted organosilicon compound (B2) is (B1)/(B2) 68/32-45/55.
< 2 > the polyacetal resin composition < 1 > wherein the ratio of (B1)/(B2) is 66/34 to 45/55.
< 3 > the polyacetal resin composition according to < 1 > or < 2 >, wherein the polyolefin-based lubricant (C) is contained in an amount of 0.7 to 1.8 parts by mass based on 100 parts by mass of the polyacetal resin (A).
< 4 > molded articles, which are obtained by molding the polyacetal resin composition of any of < 1 > to < 3 > .
< 5 > the molded article according to < 4 > which is a sliding member.
A method for producing the polyacetal resin composition according to any of < 6 > < 1 > -3 >, comprising:
a master batch obtained by kneading the ungrafted silicone compound (B2) with the polyacetal resin (A), a polyacetal resin (A), and a polyolefin resin grafted with the silicone compound (B1) were melt-kneaded.
ADVANTAGEOUS EFFECTS OF INVENTION
The polyacetal resin composition of the present invention exhibits excellent sliding characteristics and is less likely to swell when formed into a molded article, and a molded article using the polyacetal resin composition and a method for producing the polyacetal resin composition.
Detailed Description
The present invention will be described in detail below. In the present specification, the term "to" is used to mean including the numerical values before and after the term as the lower limit value and the upper limit value.
The polyacetal resin composition of the present invention (hereinafter, sometimes simply referred to as "the resin composition of the present invention") is characterized by comprising (a) 100 parts by mass of a polyacetal resin, (B1) a polyolefin resin grafted with a silicone compound, (B2) an ungrafted silicone compound, and (C) 0.5 to 1.8 parts by mass of a polyolefin lubricant, wherein the total of the content of the silicone compound in the polyolefin resin (B1) and the content of the ungrafted silicone compound (B2) is 0.6 to 2.5 parts by mass relative to 100 parts by mass of the polyacetal resin (a), and the mass ratio (B1)/(B2) of the polyolefin resin (B1) to the content of the ungrafted silicone compound (B2) is 68/32 to 45/55, whereby a polyacetal resin composition which shows excellent sliding properties and is less likely to bulge when a molded product is obtained, is provided, although it is known that the silicone compound is required for improving sliding properties, if the polyolefin resin is kneaded to provide a polyacetal resin composition which is not grafted with a master resin, and which the polyolefin resin composition is not easily swelled, the grafted silicone compound (B) is compounded in the polyacetal resin composition (B9634) and thus the grafted silicone resin composition is not grafted silicone resin (B) and thus obtained, the polyacetal resin composition can be successfully provided, and the polyacetal resin composition can be a polyacetal resin composition which is not grafted silicone resin composition (B9636) and which is not grafted silicone resin composition which is not grafted silicone resin (B) has an excellent in which is not grafted silicone resin composition, if the grafted silicone resin (B) and which is not grafted silicone resin (B) has a swelling ratio is not.
< (A) polyacetal resin
The polyacetal resin (A) used in the present invention is a polyacetal resin having an acetal structure- (-O-CRH-)n(wherein R represents a hydrogen atom or an organic group) as a repeating unit, usually an oxymethylene group (-CH) wherein R is a hydrogen atom2O-) is the main structural unit. The polyacetal resin used in the present invention includes, in addition to an acetal homopolymer composed of only the above repeating units, a copolymer (including a block copolymer), a terpolymer, and the like containing 1 or more kinds of repeating structural units other than the oxymethylene group, and may have not only a linear structure but also a branched or crosslinked structure.
Examples of the structural unit other than the oxymethylene group include: oxyethylene (-CH)2CH2O-), oxypropylene (-CH)2CH2CH2O-), butylene oxide (-CH)2CH2CH2CH2O-) and the like, among them, an optionally branched oxyalkylene group having 2 to 10 carbon atoms, preferably an optionally branched oxyalkylene group having 2 to 4 carbon atoms, and particularly preferably an oxyethylene group. The content of the oxyalkylene structural units other than oxymethylene groups in the polyacetal resin is preferably 0.1 mol% or more and 20 mol% or less, and more preferably 0.1 mol% or more and 15 mol% or less.
The polyacetal resin used in the present invention can be produced by any conventionally known method. For example, as a method for producing a polyacetal resin having oxymethylene groups and oxyalkylene groups having 2 to 4 carbon atoms as constituent units, a trimer of formaldehyde (tris (hydroxymethyl) phosphonium chloride) can be used
among these, the polyacetal resin used in the present invention is preferably tris
The resin composition of the present invention preferably contains the polyacetal resin in a proportion of 90% by mass or more, more preferably 93% by mass or more, of the composition. As will be described in detail later, the polyacetal resin may be used for masterbatch of the resin composition of the present invention, and the content of the polyacetal resin is also included in the above-mentioned content when the polyacetal resin is used for masterbatch.
The resin composition of the present invention may contain only 1 polyacetal resin, or may contain 2 or more polyacetal resins. When 2 or more species are contained, the total amount is preferably within the above range.
< (B1) polyolefin resin grafted with organosilicon compound
The polyolefin-based resin in which (B1) used in the present invention is grafted with an organic silicon compound such as polydimethylsiloxane represented by the following formula (1) is preferably grafted with a polyolefin-based resin such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, polymethylpentene, polypropylene, and tetrafluoroethylene-ethylene copolymer (which may contain a small amount of a vinyl-based monomer such as vinyl acetate, if necessary). The polyolefin-based resin is preferably a polyethylene-based resin.
Formula (1)
[ chemical formula 1]
The methyl group in the above formula (1) is optionally substituted with a substituent comprising a group selected from: the alkyl group having 2 or more carbon atoms, phenyl group, ether group, ester group, hydroxyl group, amino group, epoxy group, carboxyl group, carbinol group, methacryl group, mercapto group, phenol group, vinyl group, allyl group, polyether group, and fluorine-containing alkyl group is preferably substituted with a substituent group containing a vinyl group or an allyl group, and more preferably with a substituent group containing a vinyl group, for grafting. The substituent containing a group selected from the above alkyl groups and the like is more preferably a substituent composed only of a group selected from the above alkyl groups and the like.
Further, the average degree of polymerization n of the organosilicon compound represented by the formula (1) is preferably in the range of 1000 to 10000, and by setting the average degree of polymerization in the above range, the sliding property can be further improved .
From the viewpoint of resistance to staining of electrical contacts, it is more preferable that the content of the cyclic low-molecular monomer and oligomer in the organosilicon compound represented by the formula (1) is as small as possible.
Here, in the (B1) polyolefin-based resin used in the present invention, the polymer chains preferably exist as independent polymer chains without being crosslinked with each other. Therefore, a resin of a crosslinked structure type (three-dimensional structure type) in which main chains of (B1) polyolefin-based resins are crosslinked with each other by a grafted silicone compound and which has rubber elasticity, is not generally a (B1) polyolefin-based resin used in the present invention.
(B1) The silicone content in the polyolefin resin is preferably 20 to 70 mass%, more preferably 20 to 60 mass%, further is preferably 30 to 50 mass%, and further is preferably 35 to 45 mass%.
The resin composition of the present invention preferably contains (B1) the polyolefin-based resin in an amount of 0.6 to 2.5 parts by mass, more preferably 0.6 to 2.3 parts by mass, and further preferably 0.7 to 2.1 parts by mass in the step , based on 100 parts by mass of the polyacetal resin.
The resin composition of the present invention may contain only 1 (B1) polyolefin resin, or may contain 2 or more. When 2 or more species are contained, the total amount is preferably within the above range.
< (B2) Ungrafted organosilicon Compound
Specifically, examples of the silicone compound used in the present invention as the ungrafted silicone compound (B2) include silicones comprising polydimethylsiloxane such as the silicone compound represented by the formula (1) described above with respect to the above-mentioned polyolefin-based resin (B1), substituted silicones wherein part or all of the methyl groups in the polydimethylsiloxane are substituted with alkyl groups having 2 or more carbon atoms, phenyl groups, halogenophenyl groups, ester groups, halogenoester groups, polyether groups, and the like, modified silicones wherein the polydimethylsiloxane further steps comprise epoxy groups, amino groups, alcoholic hydroxyl groups, polyether groups, and the like, alkyl aralkyl silicones comprising dimethylsiloxane units and phenylmethylsiloxane units, alkyl aralkyl polyether modified silicones comprising siloxane units wherein part of the methyl groups in the dimethylsiloxane units are substituted with polyether groups, and phenylmethylsiloxane units, and the like.
(B2) The ungrafted organosilicon compound is preferably used in a state where a masterbatch is formed from a thermoplastic resin, more preferably (A) a polyacetal resin, and the content of the organosilicon compound in the masterbatch is preferably 10 to 60% by mass, more preferably 20 to 55% by mass, and further preferably 30 to 50% by mass in the step .
The resin composition of the present invention preferably contains (B2) 0.3 to 2.0 parts by mass of an ungrafted silicone compound (in the case where a masterbatch is formed from a thermoplastic resin, the amount of the thermoplastic resin is not contained) with respect to 100 parts by mass of a polyacetal resin, more preferably 0.35 to 1.8 parts by mass, and further preferably 0.4 to 1.4 parts by mass.
The resin composition of the present invention may contain only 1 kind (B2) of ungrafted organosilicon compound, or may contain 2 or more kinds. When 2 or more species are contained, the total amount is preferably within the above range.
Relation between (B1) and (B2)
In the resin composition of the present invention, the total of the content of the silicone compound in the (B1) polyolefin-based resin and the content of the ungrafted silicone compound in the (B2) polyolefin-based resin is 0.6 to 2.5 parts by mass relative to 100 parts by mass of the (a) polyacetal resin. The total content is preferably 0.7 parts by mass or more. The upper limit is preferably 2.0 parts by mass or less, and more preferably 1.5 parts by mass or less.
In the resin composition of the present invention, the mass ratio (B1)/(B2) of the content of the (B1) polyolefin-based resin to the content of the (B2) ungrafted organosilicon compound is 68/32 to 45/55, and the above ratio is preferably 66/34 to 45/55, more preferably 66/34 to 47/53, and further more preferably is 66/34 to 48/52, and may be 66/34 to 49/51.
Polyolefin lubricant (C)
The polyolefin-based lubricant used in the present invention may be a known polyolefin-based lubricant. The polyolefin-based lubricant is preferably a polyethylene-based lubricant (e.g., low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer) or a polypropylene-based lubricant (e.g., polypropylene), and more preferably a polyethylene-based lubricant.
The polyolefin lubricant preferably has a molecular weight of 500 to 30,000 as measured by a viscosity method.
As details of the polyolefin-based lubricant, reference is made to the descriptions in paragraphs 0030 and 0031 of japanese patent application laid-open No. 2009-275094, paragraphs 0019 to 0023 of japanese patent application laid-open No. 2008-214490, and the contents thereof are incorporated into the present specification.
A preferable example of the polyolefin-based lubricant (C) used in the present invention is (C1) a polyolefin-based lubricant having an acid value of 0.1 to 10mgKOH/g, the acid value is preferably 0.5 to 5mgKOH/g, more preferably 0.5 to 3mgKOH/g, and further is preferably 0.5 to 1.5mgKOH/g, the acid value herein is measured in accordance with JIS K0070. the molecular weight of the polyolefin-based lubricant (C1) having an acid value of 0.1 to 10mgKOH/g is preferably 1,000 to 10,000, more preferably 1,000 to 7,000, and further is preferably 3,000 to 6,000.
Another example of a preferred embodiment of the (C) polyolefin-based lubricant used in the present invention is (C2)) The density is 900 to 970kg/m3The polyolefin-based lubricant of (C1) (but not including the polyolefin-based lubricant belonging to (C1)). The density is preferably 910 to 945kg/m3The density herein is measured according to JIS K7112, and the molecular weight of the (C2) polyolefin-based lubricant is preferably 1,000 to 10,000, more preferably 5,000 to 9,000, and the melting point of the (C2) polyolefin-based lubricant is preferably 105 to 120 ℃, more preferably 109 to 118 ℃, and further is preferably 112 to 117 ℃ as measured by differential scanning calorimetry.
In the present invention, it is particularly preferable to use a combination of (C1) a polyolefin-based lubricant having an acid value of 0.1 to 10mgKOH/g and (C2) having a density of 900 to 970kg/m3A polyolefin-based lubricant of (1). The above (C1) polyolefin lubricant having an acid value of 0.1 to 10mgKOH/g, and (C2) the above lubricant having a density of 900 to 970kg/m3The mass ratio (C1)/(C2) of the content of the polyolefin lubricant is preferably 40/60 to 60/40, and more preferably 45/55 to 55/45. By setting the range as described above, the effects of the present invention can be more effectively exhibited.
Further, as the polyolefin-based lubricant, there can be obtained as a commercially available product, and there are exemplified: Hi-WAX series manufactured by Mitsui chemical Co., Ltd, SunWax series manufactured by Sanyo chemical Co., Ltd, and Ceridust series manufactured by Clariant Chemicals, Ltd.
The resin composition of the present invention contains 0.5 to 1.8 parts by mass of the polyolefin-based lubricant (C) per 100 parts by mass of the polyacetal resin, and the lower limit of the content of the polyolefin-based lubricant (C) is preferably 0.7 parts by mass or more, more preferably 0.8 parts by mass or more, and further preferably 0.9 parts by mass or more in step , and the upper limit of the content is preferably 1.6 parts by mass or less.
The resin composition of the present invention may contain only 1 kind of (C) polyolefin-based lubricant, or may contain 2 or more kinds. When 2 or more species are contained, the total amount is preferably within the above range.
In the resin composition of the present invention, the mass ratio of the content of the component (C) to the content of the organosilicon compound in the composition, "the amount of organosilicon compound/(the amount of component (C)" is preferably 0.4 or more, more preferably 0.5 or more, and , the upper limit of the "amount of organosilicon compound/(the amount of component (C)", is preferably 3.0 or less, more preferably 2.9 or less, further steps are preferably 1.3 or less, and further steps are preferably 1.0 or less.
By setting the range as described above, the effect of simultaneously achieving excellent sliding characteristics and suppression of swelling can be more effectively exhibited.
The resin composition of the present invention may contain other organosilicon compounds than the above-mentioned (B1) polyolefin-based resin and (B2) ungrafted organosilicon compound, or may not substantially contain the above-mentioned other organosilicon compounds. The term "substantially" means that the proportion of the other organosilicon compound is 1 mass% or less, preferably 0.5 mass% or less, of the total amount of the organosilicon compounds in the resin composition of the present invention.
Preferred embodiments of the present invention include those satisfying at least , preferably at least 2, more preferably at least 3 in steps , and still more preferably at least 4 in steps among the following items (1) to (4).
(1) (B1) the silicone content in the polyolefin resin is 35 to 45 mass%;
(2) contains (C1) a polyolefin lubricant having an acid value of 0.1 to 10mgKOH/g, the acid value being 0.5 to 1.5mgKOH/g, and the molecular weight of the (C1) olefin lubricant as measured by the viscometry being 3,000 to 6,000;
(3) comprising (C2) having a density of 900 to 970kg/m3The polyolefin lubricant of (C2), wherein the olefin lubricant has a molecular weight of 5,000 to 9,000 as measured by a viscosity method;
(4) comprises (C1) a polyolefin lubricant having an acid value of 0.1 to 10mgKOH/g and (C2) a density of 900 to 970kg/m3Both of the polyolefin-based lubricants of (1).
< other ingredients >
The resin composition of the present invention may contain any conventionally known additives or fillers within a range not impairing the object of the present invention. Examples of the additives and fillers used in the present invention include: thermoplastic resins other than polyacetal resin and polyolefin resin ((B1) polyolefin resin, (C) olefin lubricant), antistatic agents, ultraviolet absorbers, weather resistance agents, light stabilizers, carbon fibers, glass flakes, talc, mica, calcium carbonate, potassium titanate whiskers, pigments (including black pigments such as carbon black), and the like. The details of these methods can be found in Japanese patent laid-open publication Nos. 0113 to 0124 of 2017 and 025257, which are incorporated herein by reference.
The resin composition of the present invention may contain a lubricant other than the polyolefin-based lubricant (C) or may contain no lubricant other than the polyolefin-based lubricant (C). As embodiments of the resin composition of the present invention, there can be exemplified a mode in which a lubricant other than the polyolefin-based lubricant (other lubricant) is not substantially contained, and the substantially not containing other lubricant means that the content of other lubricant contained in the resin composition of the present invention is 1.0 to 0 mass%, preferably 0.1 to 0 mass%, of the content of the lubricant other than the polyolefin-based lubricant.
In the resin composition of the present invention, the content of the polyolefin-based resin is preferably 0.5 to 3.0% by mass, more preferably 1.0 to 2.5% by mass. The resin composition of the present invention preferably does not substantially contain a polyolefin-based resin (other polyolefin-based resin) other than the polyolefin-based resin (B1) grafted with the silicone compound and the polyolefin-based lubricant (C). The substantial absence means that the content of the other polyolefin-based resin in the resin composition of the present invention is 1.0 to 0% by mass, preferably 0.1 to 0% by mass, of the total amount of the polyolefin-based resin (B1) grafted with the organosilicon compound and the polyolefin-based lubricant (C).
The resin composition of the present invention may or may not contain a heat stabilizer. When a heat stabilizer is added, the generation of formaldehyde can be effectively suppressed. For details of the incorporation of sterically hindered phenols, reference is made to the descriptions in paragraphs 0038 to 0046 of Japanese patent application laid-open No. 2008-214490 and paragraphs 0097 to 0107 of Japanese patent application laid-open No. 2017-025257, which are incorporated herein by reference.
In the present invention, the composition may be one which does not substantially contain a thermal stabilizer. The term "substantially not included" means that the amount is less than 0.01 part by mass, preferably 0.001 part by mass or less, per 100 parts by mass of the polyacetal resin (A).
< method for producing polyacetal resin composition >
The polyacetal resin composition of the present invention comprises the above-mentioned essential components and, if necessary, the above-mentioned optional components. The production method is arbitrary, and these raw materials may be mixed and kneaded by an arbitrary conventionally known method for producing a resin composition.
As examples of the method for producing a polyacetal resin composition of the present invention, there can be exemplified a method for producing a polyacetal resin composition comprising melt-kneading a master batch obtained by kneading the above-mentioned (B2) ungrafted silicone compound with (A) a polyacetal resin, and (B1) a polyolefin-based resin grafted with a silicone compound.
By blending the ungrafted organosilicon compound (B2) as a masterbatch in this manner, the handling properties can be improved. The polyacetal resin used for the masterbatch may be the same resin as the polyacetal resin compounded in the form of a pure resin or a different resin.
In the method for producing the polyacetal resin composition of the present invention, the polyolefin-based lubricant (C) may be fed and kneaded at the same time as the polyacetal resin (a) and the polyolefin-based resin (B1), or may be added thereafter. In particular, a powdery polyolefin-based lubricant can be used as the polyolefin-based lubricant (C), but in this case, a mode of adding the lubricant after the addition is particularly preferable.
Examples of the mixing machine include a kneader, a Banbury mixer, and an extruder. The conditions and apparatuses for mixing and kneading are not particularly limited, and may be appropriately selected from any conventionally known conditions. The kneading is preferably carried out at a temperature at which the polyacetal resin melts or higher, and more specifically, at a temperature at which the polyacetal resin (A) melts or higher (usually 180 ℃ or higher).
< molded article >
The molded article of the present invention is obtained by molding the polyacetal resin composition of the present invention. Pellets obtained by pelletizing the resin composition of the present invention are molded by various molding methods to produce molded articles. Further, the resin composition after melt kneading may be directly molded by an extruder without passing through pellets to prepare a molded article.
The shape of the molded article is not particularly limited, and may be appropriately selected depending on the use and purpose of the molded article, and examples thereof include: plate-like, flat plate-like, rod-like, sheet-like, film-like, cylindrical, ring-like, circular, elliptical, gear-like, polygonal, shaped, hollow, frame-like, box-like, panel-like, and the like. The molded article of the present invention may be a finished article or a part.
The method for molding the molded article is not particularly limited, and conventionally known molding methods can be used, and examples thereof include: injection molding, injection compression molding, extrusion molding, profile extrusion, transfer molding, blow molding, gas assist blow molding, extrusion blow molding, IMC (In-mold coating) molding, rotational molding, multi-layer molding, two-color molding, insert molding, sandwich molding, foam molding, press molding, and the like.
The molded article obtained by molding the resin composition of the present invention is preferably used as a sliding part (sliding member).
Specific examples of the sliding member include: for the purpose of high quality required in electric/electronic equipment, office equipment, vehicles (automobiles), industrial equipment, and the like, sealing members such as gears, shafts, bearings, various transmission devices, cams, end face materials for mechanical seals, valve seats for valves and the like, V-rings, piston rod seals, piston rings, guide rings, and the like, and sliding parts such as shafts, sleeves, pistons, impellers, rollers, and the like of compressors.
The sliding member of the present invention can be suitably used as a sliding member in which the sliding members of the present invention are combined with each other, as well as a sliding member in which the sliding members are combined with other resin sliding members or fiber-reinforced resin sliding members, and as a sliding member in which the sliding members are combined with ceramic or metal sliding members.
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