KR20190041230A - polyoxymethylene resin composition and molding produced from the same - Google Patents

Abstract

The present invention relates to a polyoxymethylene resin composition. More particularly, the present invention relates to the polyoxymethylene resin composition in which polystyrene grafted polyethylene to a polyoxymethylene copolymer, a hard calcium carbonate coated with a fatty acid and having an average particle diameter of 100 nm or less, a hydrazide series additive, and a zinc phosphate ester series additive are mixed and added, therefore, it is possible to improve friction/wear characteristics and the modulus of elasticity and reduce the amount of formaldehyde emission below a standard value.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyoxymethylene resin composition and a molded article made from the same,

The present invention relates to a polyoxymethylene resin composition capable of effectively reducing formaldehyde emission due to excellent thermal stability and at the same time improving frictional noise by improving friction / wear characteristics so that it can be applied to a driving product, and a polyoxymethylene resin composition Lt; / RTI >

In general, polyoxymethylene resin has been widely used in the fields of automobiles, electric / electronic devices, precision machines, building materials, and living / cosmetic products because of its excellent mechanical properties, fatigue resistance, abrasion / abrasion resistance, chemical resistance and moldability .

The polyoxymethylene resin has been used in a wider range of applications, and the required properties are also increasing. Among them, polyoxymethylene resins which are widely used in sliding parts, door latch parts and gears, which are widely used in automobile and general merchandise fields, have recently emphasized the importance of environmental issues related to VOC reduction and emotional quality for noise reduction have.

In order to be applied to the above products, there is no breakage above a specific load, VOC emission is controlled to be below a reference value, and no noise is generated during operation.

In particular, products that are in close proximity to users are constantly experiencing these issues.

In order to reduce the operating noise of the polyoxymethylene resin, the friction / wear characteristics must be improved, and this technique has been known for a long time. A method of adding a fatty acid ester to a polyoxymethylene resin (see Japanese Patent Application Laid-Open No. 1982-10144), a method of adding a silicone oil to a polyoxymethylene resin (JP-A-1-204959) A method of adding an ethylene / polystyrene copolymer (Korean Published Unexamined Patent Application No. 10-2006-0098117), a method of adding a liquid ethylene /? - olefin random copolymer to a polyoxymethylene resin (JP 04-239566 A) A method of adding a polyethylene wax and a silicone oil to an oxymethylene resin (Patent No. 2970691), a method of adding a polyolefin wax and a silicone oil-containing polyethylene resin to a polyoxymethylene resin (Korean Published Unexamined Publication No. 10-2009-0019836), polyoxymethylene And a method of adding aramid powder to a resin (Korean Patent Publication No. 10-2014-0131675A). However, it is known that when a certain component is operated, The use of the product is limited due to the problem that the product is damaged.

In order to prevent breakage, an inorganic filler such as glass fiber, carbon fiber and talc can be generally added to improve its properties. However, the additive has an effect of improving the strength and elastic modulus, but another disadvantage And it was not an effective method.

In order to solve such a problem, a technique of adding calcium carbonate that improves the elasticity ratio while improving the friction / wear characteristics has been proposed. A method of melting and kneading a surface treated calcium carbonate with a fatty acid and a metal salt (Japanese Patent Publication No. 214074), a method of melting and kneading a hard calcium carbonate surface treated with a silica-based coupling agent (JP-A No. 2006-13778) (Korean Kokai Publication Hei 10-2006-0113995), a method of producing calcium carbonate by mixing an inorganic acid and a fatty acid ester in a specified ratio to a hard calcium carbonate having a ratio of Na and Sr, (JP-A-2013-136656), a method of preparing a mixture by mixing a polymer (JP-A-2013-136656) and a light calcium carbonate with a reactive nitrogen compound (quaternary ammonium compound) have. However, the use of calcium carbonate is very limited due to the problem of releasing formaldehyde by decomposing the polyoxymethylene resin during processing.

In addition, the polyoxymethylene resin is easily decomposed in a heated oxidizing atmosphere, an acidic or alkaline atmosphere due to its chemical structural characteristics, and decomposition of the polymer occurs mainly at high temperature and high processing. The formaldehyde thus generated is chemically oxidized to form formic acid, which adversely affects the heat resistance due to these substances and may cause various problems such as corrosion of metal parts or discoloration during molding. Therefore, the polyoxymethylene resin Have been known for a long time.

As a method for reducing the amount of formaldehyde emission, a method of adding acrylamide and a boron compound to a polyoxymethylene resin (JP-A No. 10-1592), a method of adding an alanine compound to a polyoxymethylene resin 59-213752), a method in which a melamine derivative is added to a polyoxymethylene resin (Japanese Patent Laid-Open No. 94-73267), a method in which a phenol compound or a nitrogen compound is added to enhance the thermal stability and antioxidative property of a polyoxymethylene resin (Japanese Patent Laid-Open No. 73-88135). However, the amount of formaldehyde generated can not be sufficiently reduced.

Further, a method of adding 1,12-dodecanedicarboxylic acid dihydrazide compound (Korean Published Unexamined Patent Application No. 10-2006-0031395) as a technique for reducing formaldehyde generation, adding an aliphatic dihydrazide compound having 4 to 12 carbon atoms (Japanese Patent Application Laid-Open No. 10-298401). However, the amount of formaldehyde generated is sufficiently reduced, but the amount of formaldehyde generated by the mold deposit due to the bleed-out of the additive is low, And the use thereof is limited. Further, it has a problem that it can not sufficiently suppress formaldehyde emission at high temperature.

That is, a method for a polyoxymethylene resin composition capable of effectively reducing formaldehyde while having high mechanical properties while effectively improving the friction / wear characteristics of the polyoxymethylene resin is unsatisfactory in the currently known technology.

The present invention relates to a polyoxymethylene resin composition which improves the friction / wear characteristics of a conventional polyoxymethylene resin to effectively improve operating noise, reduces formaldehyde emission and improves the modulus of elasticity, and a molded article And the like.

Accordingly, the present invention provides, as a first preferred embodiment, a polyoxymethylene resin; And 1 to 10 parts by weight of a graft copolymer based on 100 parts by weight of the polyoxymethylene resin, 5 to 15 parts by weight of a hard calcium carbonate coated with a fatty acid, 0.05 to 0.5 parts by weight of a dihydrazide compound represented by the following formula , 0.05 to 1 part by weight of a zinc phosphate ester compound represented by the following general formula (2) or (3).

[Chemical Formula 1]

로 표시되는 구조일 수 있다.In the above formula (1), R ₁ represents a C4-C10 alkane group or

. ≪ / RTI >

(2)

In the above formula (2), R ₂ is a C 16 -C 24 alkyl group.

(3)

In the above formula (3), R ₂ is a C 16 -C 24 alkyl group.

The graft copolymer may be at least one selected from the group consisting of polystyrene, acrylonitrile-styrene copolymer, butyl acrylate-methyl methacrylate, ethylene glycidyl methacrylate copolymer at least one member selected from the group consisting of polypropylene and polycarbonate and at least one member selected from the group consisting of polypropylene and polycarbonate, And grafting the copolymer.

The hard calcium carbonate coated with the fatty acid may be at least one saturated fatty acid selected from lauric acid, capric acid, myristic acid, and stearic acid; At least one unsaturated fatty acid selected from oleic acid, linolic acid and linolenic acid; Or a salt thereof, and a salt thereof.

The hard calcium carbonate coated with the fatty acid has an average particle diameter of 100 nm or less.

The dihydrazide compound may be at least one selected from the group consisting of adipic acid dihydrazide, sebacic acid dihydrazide, 1,12-dodecanedicarboxylic acid dihydrazide ) And isophthalic acid dihydrazide, wherein the isophthalic acid dihydrazide is at least one selected from the group consisting of isophthalic acid dihydrazide and isophthalic acid dihydrazide.

The zinc phosphate ester compound may be selected from the group consisting of zinc stearyl phosphate, zinc behenic phosphate, zinc arachidonic phosphate, zinc palmitic phosphate, And at least one selected from the group consisting of

The present invention provides, as a second preferred embodiment, a molded article produced from the above-mentioned polyoxymethylene resin composition.

The molded article is characterized by having a tensile and flexural modulus of 2,800 MPa or more, a friction coefficient of 0.2 or less, a non-wear amount of 0.015 mm ³ / Nkm or less, and a formaldehyde release amount of 220 mg / kg or less measured at VDA 275 .

INDUSTRIAL APPLICABILITY The polyoxymethylene resin composition according to the present invention has high mechanical properties and remarkably reduces the amount of formaldehyde emission, thereby improving the friction / wear characteristics of the polyoxymethylene resin composition. Can be applied.

According to a preferred embodiment of the present invention, a polyoxymethylene resin; And 1 to 10 parts by weight of a graft copolymer based on 100 parts by weight of the polyoxymethylene resin, 5 to 15 parts by weight of a hard calcium carbonate coated with a fatty acid, 0.05 to 0.5 parts by weight of a dihydrazide compound represented by the following formula And 0.05 to 1.0 part by weight of a zinc phosphate ester compound represented by the following general formula (2) or (3).

[Chemical Formula 1]

로 표시되는 구조일 수 있다.In the above formula (1), R ₁ represents a C4-C10 alkane group or

. ≪ / RTI >

(2)

In the above formula (2), R ₂ is a C 16 -C 24 alkyl group.

(3)

In the above formula (3), R ₂ is a C 16 -C 24 alkyl group.

Hereinafter, the present invention will be described in detail.

The polyoxymethylene resin used in the present invention refers to a homopolymer, a copolymer or a ternary copolymer having a general oxymethylene group (- (- OCH ₂ ) _n -) as a main unit. The copolymer used in the present invention is 1 , And 3-dioxolane were used.

The polyoxymethylene copolymer can be obtained by cationic random copolymerization of a mixture of cyclic oligomers of trioxane or tetraoxane, preferably cyclic oligomers of trioxane and 1,3-dioxolane comonomer. The polyoxymethylene copolymer of the present invention is prepared by adding 1,3-dioxolane comonomer to trioxane, which is a main monomer, followed by cation random copolymerization using a Lewis acid catalyst, thereby obtaining a polymer having two or more bonding carbon atoms in the main chain An oxymethylene copolymer can be obtained.

The structure of the polyoxymethylene copolymer may have a branched structure and a crosslinked structure as well as a linear structure.

(- (OCH ₂ CH ₂ ) _n -), oxypropylene (- (OCH ₂ CH ₂ CH ₂ ) _n -) as the constitutional unit of the comonomer other than the oxymethylene group as the main chain of the polyoxymethylene copolymer, And branched oxyalkylene groups having 2 to 10 carbon atoms such as oxybutylene (- (OCH ₂ CH ₂ CH ₂ CH ₂ ) _n -). Among them, branched oxy groups having 2 to 4 carbon atoms An alkylene group, and an oxyethylene group is particularly preferable.

In the polyoxymethylene copolymer, the comonomer is at least one selected from the group consisting of ethylene oxide, 1,3-dioxolane, 1,3-dioxepane, 1,3 , And 5-trioxepane (1,3,5-trioxepane). Of these, 1,3-dioxolane is more preferably copolymerized.

The graft copolymer serves to improve the abrasion / abrasion characteristics of the polyoxymethylene resin composition. As a specific example, the polyethylene constituting the main chain is one kind selected from polypropylene and polycarbonate Or more, but most preferably, polyethylene is suitable.

The copolymer grafted to the main chain may be selected from the group consisting of polystyrene, acrylonitrile-styrene copolymer, butyl acrylate-methyl methacrylate, ethylene glycidyl methacrylate copolymer (Ethylene-glycidyl methacrylate copolymer), and ethylene-ethyl acrylate copolymer. Among these, polystyrene is most preferable.

The graft copolymer is preferably 1 to 10 parts by weight, more preferably 3 to 5 parts by weight, based on 100 parts by weight of the polyoxymethyl resin. If the content is less than 1 part by weight, the effect of improving the friction / wear characteristics can not be confirmed. If the content is more than 10 parts by weight, the mechanical properties may be deteriorated and the product may be damaged.

The hard calcium carbonate coated with the fatty acid has an average particle diameter of 100 nm or less. The fatty acid-coated hard calcium carbonate improves the friction / wear characteristics and improves the modulus of elasticity to prevent breakage of the product. However, when it is used without surface treatment, the hard calcium carbonate hardly disperses, have. Therefore, in general, hard calcium carbonate is a necessary part to prevent agglomeration of particles in the resin, improve dispersibility and improve friction / wear and mechanical properties.

In the present invention, at least one saturated fatty acid selected from lauric acid, capric acid, myristic acid and stearic acid is used as a specific example of the surface treatment. Treated with at least one surfactant selected from the group consisting of unsaturated fatty acids selected from the group consisting of oleic acid, linolic acid and linolenic acid, and salts thereof. These may be used alone or in combination of two or more as necessary.

The hard calcium carbonate coated with the fatty acid which improves the friction / wear characteristics and the elastic modulus is preferably 5 to 15 parts by weight, more preferably 8 to 12 parts by weight, based on 100 parts by weight of the polyoxymethylene resin. When the content is less than 5, the improvement of the modulus of elasticity is insufficient. When the content is more than 15 parts by weight, the amount of formaldehyde gas is extremely increased due to calcium carbonate added during processing.

The dihydrazide compound acts to effectively capture formaldehyde and is a compound represented by the following formula (1).

[Chemical Formula 1]

로 표시되는 구조일 수 있다.In the above formula (1), R ₁ represents a C4-C10 alkane group or

. ≪ / RTI >

Specific examples thereof include adipic acid dihydrazide, sebacic acid dihydrazide, 1,12-dodecanedicarboxylic acid dihydrazide, isophthalic acid dihydrazide, And at least one dihydrazide compound selected from the group consisting of isophthalic acid dihydrazide.

The amount of the dihydrazide compound capturing the formaldehyde gas is preferably 0.05 to 0.5 parts by weight, more preferably 0.1 to 0.2 parts by weight based on 100 parts by weight of the polyoxymethylene resin. When the content is less than 0.05, the formaldehyde trapping effect is insufficient and the formaldehyde released from the molded article can not be effectively reduced. When the content is more than 0.5 part by weight, a problem occurs that the incidence of mold depreciation is increased due to unreacted materials .

The zinc phosphate ester compound is a compound represented by the following formula (2) or (3), preferably a fatty acid ester of 16 to 22 carbon atoms.

(2)

In the above formula (2), R ₂ is a C 16 -C 24 alkyl group.

(3)

In the above formula (3), R ₂ is a C 16 -C 24 alkyl group.

Specific examples thereof include at least one of Zinc stearyl phosphate, Zinc behenic phosphate, Zinc arachidonic phosphate, Zine palmitic phosphate, and mixtures thereof Of zinc phosphate ester compounds.

The zinc phosphate ester compound which improves thermal stability in the present invention is preferably 0.05 to 1 part by weight, more preferably 0.1 to 0.2 part by weight based on 100 parts by weight of the polyoxymethylene resin. When the content is less than 0.05, the effect of reducing the formaldehyde is inferior due to the lack of the thermal stability effect, and when the content is more than 1 part by weight, the formaldehyde reduction effect is not exhibited.

The composition of the present invention may contain additives such as filler such as calcium carbonate, clay, silicon oxide, mica powder, glass fibers, carbon fibers, reinforcing agents such as polyamide fibers, An antioxidant such as a nucleating agent, a plasticizer, a hindered phenol compound or a phosphate compound, a releasing agent such as ethylene bis stearate, a polyethylene wax and a lubricant may be arbitrarily contained.

According to the present invention, it is possible to produce a polyoxymethylene resin composition capable of improving the elasticity and decreasing formaldehyde emission while improving the friction / wear characteristics as described above.

According to another preferred embodiment of the present invention, there is provided a molded article produced from the above-mentioned polyoxymethylene resin composition.

The molded article is characterized by having a tensile and flexural modulus of 2,800 MPa or more, a friction coefficient of 0.2 or less, a non-wear amount of 0.015 mm ³ / Nkm or less, and a formaldehyde release amount of 220 mg / kg or less measured at VDA 275 . The higher the tensile and flexural modulus is, the better, and the smaller the lower the friction coefficient, the non-wear amount and the formaldehyde discharge amount, the better the physical properties.

Hereinafter, the present invention will be described in detail based on preferred embodiments.

The present invention is not limited to the following examples.

Example  1 to 5 and Comparative Example  1 to 8

Polyoxyethylene (b) the polystyrene is grafted polyethylene (NOF corporation, A1100), ( c) coated with an organic acid having a particle size of less than 100㎚ in methylene in the (a) polyoxymethylene resin (Kolon plastic, KOCETAL ^® K300) resin (D) 1,12-sebacic acid dihydrazide (Otsuka Chemical, SDH) and (e) zinc stearyl phosphate (Sakai chemical, LBT-1830) A polyoxymethylene resin composition was prepared from the contents in Table 1. The content shown in Table 1 below is based on 100 parts by weight of the polyoxymethylene resin.

Property evaluation

The properties of the polyoxymethylene resin compositions prepared in Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 2 below.

1. Flexural modulus

Measured according to ISO 178 standard.

2. Tensile modulus

It was measured according to ISO 527-1 / -2 standard.

3. Formaldehyde Emission

VDA 275 (German Automobile Manufacturers Association Standard). For the test specimens, square specimens of 100 mm × 40 mm × 2 mm were used. The specimens were prepared by injection at 190 ° C and 220 ° C, respectively.

(1) 50 ml of distilled water was placed in a polyethylene container, and the test piece was kept in air-tight state at 60 캜 for 3 hours.

(2) After removing the container, the test piece was taken at room temperature for 1 hour.

(3) The distilled water in the polyethylene container was reacted using the acetyl acetone colorimetric method and the amount of formaldehyde absorbed was measured using a UV Spectrometer.

4. Evaluation of friction / wear

A thrust friction tester manufactured according to ASTM 3702 was used. A cylindrical injection molding specimen was injected and used as a sample. SUS304 material was used as a relative material. The test specimens were fixed on the upper side, and the test specimens were mounted so as to be horizontal with the lower side relative material, and the relative friction coefficient was measured by rotating the counterpart material clockwise, and the amount of wear was calculated. The friction / wear test conditions were fixed at a load of 7 kgf, a wear rate of 20 cm / s, and an evaluation time of 30 minutes.

division (a) (b) (c) (d) (e) Example 1 100 5 10 0.2 0.1 Example 2 100 One 10 0.2 0.1 Example 3 100 10 10 0.2 0.1 Example 4 100 5 5 0.2 0.1 Example 5 100 5 15 0.2 0.1 Example 6 100 5 10 0.05 0.1 Example 7 100 5 10 0.5 0.1 Example 8 100 5 10 0.2 0.05 Example 9 100 5 10 0.2 1.0 Comparative Example 1 100 - - - - Comparative Example 2 100 - 10 - - Comparative Example 3 100 5 - - - Comparative Example 4 100 5 10 - - Comparative Example 5 100 5 10 0.2 - Comparative Example 6 100 5 10 - 0.1 Comparative Example 7 100 0.50 10 0.2 0.1 Comparative Example 8 100 11 10 0.2 0.1 Comparative Example 9 100 5 4 0.2 0.1 Comparative Example 10 100 5 16 0.2 0.1 Comparative Example 11 100 5 10 0.04 0.1 Comparative Example 12 100 5 10 0.6 0.1 Comparative Example 13 100 5 10 0.2 0.04 Comparative Example 14 100 5 10 0.2 1.1

division Tensile modulus
(MPa) Flexural modulus
(MPa) Formaldehyde
Emission
190 degrees
(mg / kg) Formaldehyde
Emission
220 degrees
(mg / kg) Coefficient of friction Non-wear amount Example 1 3,320 3,238 0.8 1.8 0.1525 0.0126 Example 2 3,350 3,217 1.1 2.2 0.1855 0.0144 Example 3 3,172 3,030 1.8 3.1 0.1495 0.0127 Example 4 2,888 2,810 0.2 1.1 0.1658 0.0133 Example 5 3,625 3,551 3.2 4.5 0.1444 0.0121 Example 6 3,318 3,195 3.0 4.9 0.1548 0.0129 Example 7 3,111 3,020 1.2 3.8 0.1772 0.0140 Example 8 3.275 3,112 0.9 4.7 0.1551 0.0130 Example 9 2,955 2,876 0.7 4.1 0.1821 0.0133 Comparative Example 1 2,710 2,600 15.1 25.8 0.3108 0.0177 Comparative Example 2 3,520 3,421 35.1 45.2 0.1811 0.0149 Comparative Example 3 2,620 2,580 14.7 20.1 0.1658 0.0137 Comparative Example 4 3,377 3,190 33.1 51.2 0.1448 0.0120 Comparative Example 5 3,288 3,102 4.5 10.1 0.1511 0.0129 Comparative Example 6 3,320 3,199 28.1 31.2 0.1499 0.0128 Comparative Example 7 3,522 3,478 1.2 2.1 0.1758 0.0158 Comparative Example 8 2,510 2,520 1.5 2.7 0.1435 0.0121 Comparative Example 9 2,780 2,721 0.8 1.0 0.1752 0.0155 Comparative Example 10 3,750 3,595 5.3 7.9 0.1401 0.0119 Comparative Example 11 3.280 3,199 4.1 10.5 0.1510 0.0125 Comparative Example 12 3.225 3,101 0.2 0.5 0.1625 0.0153 Comparative Example 13 3,220 3,095 1.2 9.2 0.1518 0.0129 Comparative Example 14 3,095 3,011 0.9 1.0 0.1611 0.0161

As a result of the physical property evaluation, as shown in Table 2, the friction resistance / abrasion characteristics are insufficient when the component (a) is lower than the reference value, and the mechanical properties are lowered when the component (a) is higher than the reference value. When the component (b) is below the reference value, the friction / wear characteristics are insufficient, and when it exceeds the reference value, the formaldehyde emission amount is not reduced. When the component (c) is below the reference value, the amount of formaldehyde emission is not reduced, and when it exceeds the reference value, the amount of non-abrasion is a problem. When the component (d) is below the reference value, the amount of formaldehyde emission at a high temperature is not reduced, and when it exceeds the reference value, the amount of non-abrasion becomes a problem.

The aim of the present invention is to provide a polyoxymethylene resin composition which can be used only when the polyoxymethylene resin as the component (a) is added to the polyoxymethylene resin in the optimal combination of the components (b), (c), (d) It can be confirmed that there is no.

Claims (8)

Polyoxymethylene resin; And 1 to 10 parts by weight of a graft copolymer based on 100 parts by weight of the polyoxymethylene resin, 5 to 15 parts by weight of a hard calcium carbonate coated with a fatty acid, 0.05 to 0.5 parts by weight of a dihydrazide compound represented by the following formula , 0.05 to 1 part by weight of a zinc phosphate ester compound represented by the following formula (2) or (3).
[Chemical Formula 1]

In the above formula (1), R ₁ represents a C4-C10 alkane group or

. ≪ / RTI >

(2)

In the above formula (2), R ₂ is a C 16 -C 24 alkyl group.

(3)

In the above formula (3), R ₂ is a C 16 -C 24 alkyl group.
The method of claim 1, wherein the graft copolymer is selected from the group consisting of polystyrene, acrylonitrile-styrene copolymer, butylacrylate-methyl methacrylate, ethylene glycidyl methacrylate, At least one selected from the group consisting of ethylene-glycidyl methacrylate copolymer and ethylene-ethyl acrylate copolymer is selected from polypropylene and polycarbonate. Wherein the polyoxymethylene resin composition is a copolymer obtained by grafting at least one of the polyoxymethylene resin composition of the present invention and the polyoxymethylene resin composition.
The method of claim 1, wherein the hard calcium carbonate coated with the fatty acid is at least one selected from the group consisting of lauric acid, capric acid, myristic acid, and stearic acid Saturated fatty acids; At least one unsaturated fatty acid selected from oleic acid, linolic acid and linolenic acid; And a salt thereof. The polyoxymethylene resin composition according to claim 1, wherein the polyoxyalkylene resin is a polyoxyethylene resin.
The polyoxymethylene resin composition according to claim 3, wherein the hard calcium carbonate coated with the fatty acid has an average particle diameter of 100 nm or less.
The method according to claim 1, wherein the dihydrazide compound is selected from the group consisting of adipic acid dihydrazide, sebacic acid dihydrazide, 1,12-dodecanedicarboxylic acid dihydrazide (1 , 12-dodecanedicarboxylic acid dihydrazide, and isophthalic acid dihydrazide. The polyoxymethylene resin composition according to claim 1,
The method of claim 1, wherein the zinc phosphate ester compound is selected from the group consisting of zinc stearyl phosphate, zinc behenic phosphate, zinc arachidonic phosphate, zinc palmitic acid phosphate, phosphate, and mixtures thereof. The polyoxymethylene resin composition according to claim 1,
A molded article produced from the resin composition of any one of claims 1 to 6.
The molded article according to claim 1, wherein the molded article has a tensile and flexural modulus of at least 2,800 MPa, a friction coefficient of 0.2 or less and a non-wear amount of 0.015 mm ³ / Nkm or less and a formaldehyde discharge amount of 220 mg / kg. < / RTI >