KR20180038866A - Polyoxymethylene Resin Composition and Molding Product Including the Same - Google Patents

Abstract

The present invention relates to a polyoxymethylene resin composition, which comprises, on the basis of the total weight of the composition, 70 to 80 wt% of polyoxymethylene, 15 to 25 wt% of a thermoplastic polyurethane, 2.0 to 5.0 wt% of an ethylene-ethyl acrylate copolymer, and 0.2 to 0.5 wt% of an isocyanate compound, and to a molded article produced therefrom. Accordingly, the present invention provides the polyoxymethylene resin composition having excellent impact strength and the molded article produced using the same.

Description

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

The present invention relates to a polyoxymethylene resin composition and a molded article produced using the same.

Polyoxymethylene (POM) resin has excellent mechanical properties, rigidity, creep resistance, chemical resistance, friction / wear characteristics, long term durability, and is known as crystalline engineering plastic with high crystallinity. Utilizing this feature, POM is used in a wide range of fields such as electronic parts, automobile parts, and industrial parts. In addition, as the use of polyoxymethylene resin has been widely used in recent years, there is a constant demand for development of technology for improving the inherent properties of resins.

Particularly, when the polyoxymethylene resin is used for parts such as clips, buttons, fasteners for automobiles or electronic devices, excellent impact strength characteristics are demanded. As a conventional technique for improving the impact strength of a polyoxymethylene resin, there have been proposed a method of adding a plasticizer, an impact modifier and a coupling agent to a polyoxymethylene resin (refer to Japanese Patent Publication No. 2013-0117794) A method of adding a compatibilizing agent and an impact modifier (US Patent Publication No. 2007-0276064) has been proposed.

However, in the case of the above conventional techniques, when the flowability of the resin is good, the mechanical properties are insufficient or the mechanical properties are excellent, but the flowability of the resin is lowered. Accordingly, there is a continuing demand for development of a polyoxymethylene resin capable of further increasing the impact strength without decreasing the flowability of the resin.

Accordingly, it is an object of the present invention to provide a polyoxymethylene resin composition having excellent impact strength characteristics and a molded article produced using the same.

A first preferred embodiment of the present invention for solving the above problems is a thermoplastic polyurethane foam comprising 70 to 80% by weight of polyoxymethylene, 15 to 25% by weight of a thermoplastic polyurethane, 2.0 to 5.0% by weight of an ethylene- And 0.2 to 0.5% by weight of an isocyanate compound.

The first said polyoxymethylene according to the embodiment, the melting point as measured by differential scanning calorimetry (DSC) (T _m) is 160 to 180 ℃ is intended may, polyurethane having a weight average molecular weight of 40,000 to 80,000 g / mol Lt; / RTI >

The ethylene-ethyl acrylate copolymer according to the first embodiment includes 5 to 35 mol% of ethyl acrylate repeating units and 65 to 95 mol% of ethylene repeating units based on the total mol of the polymer, and the differential scanning calorimetry DSC) melting point (T _m) may be one of the 80 to 100 ℃ as measured by, than the isocyanate compound, or an aliphatic isocyanate, an alicyclic isocyanate, an aromatic isocyanate, and that at least one member selected from the group into the mixtures thereof Preferably methylene diphenyl diisocyanate.

In the present invention, the composition according to the first embodiment may further include at least one of 0.1 to 2.0% by weight of an antioxidant and 0.1 to 2.0% by weight of a release agent based on the total weight of the composition, and the melt index (MI) 5.5 g / 10 min or more.

In order to solve the above problems, the present invention provides a molded article formed from the polyoxymethylene resin composition of the first embodiment as a second preferred embodiment of the present invention, wherein the molded article according to the second embodiment has a tensile modulus An elongation of not less than 150%, an Izod impact strength of not less than 19 kgf · cm / cm at 23 ° C and a Izod impact strength of not less than 9 kgf · cm / cm at a low temperature of -30 ° C according to ASTM D256 measurement standard have.

According to the present invention, it is possible to provide a polyoxymethylene resin composition having an excellent impact strength, and thus can be suitably applied to applications such as clips, buttons, and fasteners that require high impact strength at room temperature and low temperature have.

The present invention relates to a composition comprising 70 to 80% by weight of polyoxymethylene, 15 to 25% by weight of a thermoplastic polyurethane, 2.0 to 5.0% by weight of an ethylene-ethyl acrylate copolymer, and 0.2 to 0.5% by weight of an isocyanate compound, To provide a polyoxymethylene resin composition, and to provide a molded article produced therefrom.

The present invention improves the impact resistance through the ethylene-ethyl acrylate copolymer and improves the compatibility of the polyoxymethylene resin and the thermoplastic polyurethane resin by adding an isocyanate compound as a coupling agent, and ultimately, the ASTM D1238 measurement A melt index (MI) of 5.5 g / 10 min or more, a tensile elongation of 150% or more as measured by ASTM D638 manufactured by a molded product, and an Izod impact strength of 19 kgf cm / cm And an Izod impact strength at a low temperature of -30 占 폚 of 9 kgf 占 / m / cm or more can be provided.

Thus, the resin composition of the present invention can be used for clips, buttons, fasteners, and the like of automobile interior and exterior materials and electronic appliances, without deterioration in the flowability of resin, and securing excellent mechanical properties.

Hereinafter, each component of the resin composition of the present invention will be described in more detail.

Polyoxymethylene

The polyoxymethylene of the present invention includes an oxymethylene- (OCH ₂ ) n - group as a repeating unit, and is an oxymethylene homopolymer in which both ends are blocked by an ester group or an ether group, or a polymer chain comprising oxymethylene monomer units An oxymethylene-based copolymer in which an oxyalkylene unit having 2 to 8 carbon atoms is randomly inserted into the main chain and both ends of the polymer are blocked with an ester or an ether group, or a terpolymer.

The polyoxymethylene of the present invention serves as a base resin of the resin composition, secures the basic mechanical and chemical properties of the resin, and particularly performs a function important for abrasion resistance. In the present invention, the polyoxymethylene is not particularly limited as long as it is a commonly used polyoxymethylene, but it is more preferable that the melting point (T _m ) measured by differential scanning calorimetry (DSC) is 160 to 180 ° C .

If the content of the polyoxymethylene is less than 70% by weight based on the total weight of the resin composition, the tensile strength and the bending strength may be lowered. If the polyoxymethylene is more than 80% by weight, the tensile elongation and the impact strength may decrease. By weight to 80% by weight.

Although the present invention is not particularly limited thereto, the oxymethylene homopolymer and the oxymethylene-based copolymer may be prepared by the following method. First, the above-mentioned oxymethylene homopolymer is polymerized by introducing anhydrous formaldehyde into an organic solvent containing a basic polymerization catalyst such as, for example, an organic amine, an organic or inorganic tin compound, or a metal hydroxide, filtering the polymer, By heating in acetic anhydride in the presence of sodium to acetylate the end.

The oxymethylene-based copolymer may be obtained by copolymerization of a cyclic oligomer of formaldehyde such as, for example, anhydrous trioxane or tetraoxane and a cyclic oligomer of formaldehyde such as ethylene oxide, propylene oxide, 1,3-dioxolane, But are not limited to, for example, 1,4-butane diol, 1,4-butane diol, 1,4-butane diol, 1,5- Trioxomethane or the like is dissolved or suspended in an organic solvent such as cyclohexane or benzene, and then a Lewis acid catalyst such as boron triflate diethylether is added to polymerize to decompose and remove the unstable terminal have.

In the present invention, it may be preferable to select an oxymethylene copolymer from the viewpoint of balance of heat resistance, mechanical strength and impact resistance. Here, the oxymethylene-based copolymer may contain 0.4 to 15 mol% of oxyethylene repeating units and 85 to 99.6 mol% of oxy-methylene repeating units based on the total mol of the polymer from the viewpoints of improving the thermal stability of the polymer and improving the crystallinity of the formability have.

Thermoplastic polyurethane

In the present invention, the thermoplastic polyurethane resin may contain diisocyanate in a molecular structure; And ester linkages, and more specifically, diisocyanate compounds; Polymer polyols; And low molecular polyols and / or polyamines. Preferably, the thermoplastic polyurethane of the present invention may have a weight average molecular weight of 40,000 to 80,000 g / mol as measured by GPC (Gel Permeation Chromatography).

Herein, in describing the present invention, the weight average molecular weight means a value measured by the following method.

≪ Weight average molecular weight &

The substance to be measured was dissolved in tetrahydrofuran to a concentration of 0.2%, filtered through a 0.45 μm PTFE syringe filter, and 10 μL was injected into gel permeation chromatography (GPC, Waters Alliance e2695 + Waters 2414 RI Detector). The mobile phase of GPC is tetrahydrofuran, flowing at a flow rate of 1.0 mL / min, and analysis is performed at 30 < 0 > C. The columns are connected in series using two Agilent's PI gel Mixed D, and the detector is measured at 40 ° C using an RI detector. The calibration curve is obtained by dissolving polystyrene standard in tetrahydrofuran at a concentration of 0.1% and injecting the polymer into a polystyrene-reduced weight average molecular weight (Mw).

In the present invention, the thermoplastic polyurethane is mixed with the base resin, polyoxymethylene, and is present between the resins to absorb and absorb external shocks. In this respect, the thermoplastic polyurethane preferably contains 15 to 25% by weight based on the total weight of the resin composition. If the content is less than 15% by weight, improvement in tensile elongation and impact strength characteristics may be insufficient. Strength and flexural strength characteristics may be degraded.

Ethylene- Ethyl acrylate  Copolymer

In the present invention, the ethylene-ethyl acrylate copolymer also functions as an impact modifier to absorb and absorb external impact while being mixed with polyoxymethylene to be present between the resins. The ethylene-ethyl acrylate copolymer Ethyl acrylate is not particularly limited as long as it is a commercially available ethylene-ethyl acrylate copolymer, but it is preferable that the content of ethyl acrylate is 5 to 35 mol% and the content of ethylene is 65 to 95 mol%, and the content is measured by differential scanning calorimetry (DSC) (T _m ) of 80 to 100 캜.

When the content of the ethylene-ethyl acrylate copolymer is less than 2.0% by weight, the content of the ethylene-ethyl acrylate copolymer serves as an impact reinforcing agent, and if it is more than 5.0% by weight, the ethylene-ethyl acrylate copolymer may act as a factor of lowering tensile strength and bending strength , It is preferable to add 2.0 to 5.0% by weight based on the total weight of the composition.

Isocyanate compound

In the present invention, the isocyanate compound serves as a coupling agent for increasing the compatibility of polyoxymethylene and thermoplastic polyurethane. When the content is less than 0.2% by weight, the isocyanate compound is not sufficient to perform the role of a coupling agent. When the content is more than 0.5% by weight The content thereof is too high to significantly reduce the flowability of the resin, and it is preferable that the content is 0.2 to 0.5% by weight based on the total weight of the composition.

The isocyanate compound may be one or more selected from the group consisting of aliphatic isocyanates, alicyclic isocyanates, aromatic isocyanates, and mixtures thereof.

Examples of isocyanate compounds that can be suitably used in the present invention include methylene diphenyl diisocyanate (MDI); 3,3'-dimethyl-4,4'-biphenylene diisocyanate (TODI); Toluene diisocyanate (TDI); Polymeric MDI; Carbodiimide modified liquid 4,4'-diphenylmethane diisocyanate; Paraphenylene diisocyanate (PPDI); Meta-phenylene diisocyanate (MPDI); Triphenylmethane-4,4'- and triphenylmethane-4,4'-triisocyanate; Naphthylene-1,5-diisocyanate; 2,4'-, 4,4'- and 2,2-biphenyl diisocyanate; Polyphenylene polymethylene polyisocyanate (PMDI) (also known as polymeric PMDI); A mixture of MDI and PMDI; A mixture of PMDI and TDI; Ethylene diisocyanate; Propylene-1,2-diisocyanate; Trimethylene diisocyanate; Butylene diisocyanate; Biotolylene diisocyanate; Tolidine diisocyanate; Tetramethylene-1,2-diisocyanate; Tetramethylene-1,3-diisocyanate; Tetramethylene-1,4-diisocyanate; Pentamethylene diisocyanate; 1,6-hexamethylene diisocyanate (HDI); Octamethylene diisocyanate; Decamethylene diisocyanate; 2,2,4-trimethylhexamethylene diisocyanate; 2,4,4-trimethylhexamethylene diisocyanate; Dodecane-1,12-diisocyanate; Dicyclohexyl methane diisocyanate; Cyclobutane-1,3-diisocyanate; Cyclohexane-1,2-diisocyanate; Cyclohexane-1,3-diisocyanate; Cyclohexane-1,4-diisocyanate; Diethylidene diisocyanate; Methylcyclohexylene diisocyanate (HTDI); 2,4-methylcyclohexane diisocyanate; 2,6-methylcyclohexane diisocyanate; 4,4'-dicyclohexyldiisocyanate; 2,4'-dicyclohexyldiisocyanate; 1,3,5-cyclohexane triisocyanate; Isocyanato methyl cyclohexane isocyanate; 1-isocyanoate-3,3,5-trimethyl-5-isocyanatomethylcyclohexane; Isocyanatoethyl cyclohexane isocyanate; Bis (isocyanatomethyl) -cyclohexane diisocyanate; 4,4'-bis (isocyanatomethyl) dicyclohexane; 2,4'-bis (isocyanatomethyl) dicyclohexane; Isophorone diisocyanate (IPDI); Dimeryl diisocyanate; Dodecane-1,12-diisocyanate; 1,10-decamethylene diisocyanate; Cyclohexylene-1,2-diisocyanate; 1,10-decamethylene diisocyanate; 1-chlorobenzene-2,4-diisocyanate; Furfurylidene diisocyanate; 2,4,4-trimethylhexamethylene diisocyanate; 2,2,4-trimethylhexamethylene diisocyanate; Dodecamethylene diisocyanate; 1,3-cyclopentane diisocyanate; 1,3-cyclohexane diisocyanate; 1,3-cyclobutane diisocyanate; 1,4-cyclohexane diisocyanate; 4,4'-methylenebis (cyclohexyl isocyanate); 4,4'-methylene bis (phenyl isocyanate); 1-methyl-2,4-cyclohexane diisocyanate; 1-methyl-2,6-cyclohexane diisocyanate; 1,3-bis (isocyano-methyl) cyclohexane; 1,6-diisocyanato-2,2,4,4-tetra-methylhexane; 1,6-diisocyanato-2,4,4-tetra-trimethyl hexane; Trans-cyclohexane-1,4-diisocyanate; 3-isocyanato-methyl-3,5,5-trimethylcyclo-hexyl isocyanate; 1-isocyanoate-3,3,5-trimethyl-5-isocyanatomethylcyclohexane; Cyclo-hexyl isocyanate; Dicyclohexylmethane 4,4'-diisocyanate; 1,4-bis (isocyanatomethyl) cyclohexane; m-phenylene diisocyanate; m-xylylene diisocyanate; m-tetramethyl xylylene diisocyanate; p-phenylene diisocyanate; p, p'-biphenyldiisocyanate; 3,3'-dimethyl-4,4'-biphenylene diisocyanate; 3,3'-dimethoxy-4,4'-biphenylene diisocyanate; 3,3'-diphenyl-4,4'-biphenylene diisocyanate; 4,4'-biphenylene diisocyanate; 3,3'-dichloro-4,4'-biphenylene diisocyanate; 1,5-naphthalene diisocyanate; 4-chloro-1,3-phenylene diisocyanate; 1,5-tetrahydronaphthalene diisocyanate; Meta xylene diisocyanate; 2,4-toluene diisocyanate; 2,4'-diphenylmethane diisocyanate; 2,4-chlorophenylene diisocyanate; 4,4'-diphenylmethane diisocyanate; p, p'-diphenylmethane diisocyanate; 2,4-tolylene diisocyanate; 2,6-tolylene diisocyanate; 2,2-diphenylpropane-4,4'-diisocyanate; 4,4'-toluidine diisocyanate; Dianedian diisocyanate; 4,4'-diphenyl ether diisocyanate; 1,3-xylylene diisocyanate; 1,4-naphthylene diisocyanate; Azobenzene-4,4'-diisocyanate; Diphenylsulfone-4,4'-diisocyanate; And diisocyanate or triisocyanate selected from mixtures thereof. Among them, it is particularly preferable to use methylenediphenyl diisocyanate, which is a raw material of thermoplastic polyurethane and has the highest reactivity, It may be most suitable for increasing the compatibility of the TPU.

Meanwhile, the composition of the present invention may further contain 0.1 to 2.0% by weight of an antioxidant and 0.1 to 2.0% by weight of a release agent based on the total weight of the composition.

Antioxidant

In the present invention, the antioxidant is a hindered phenol-based antioxidant and plays a role of capturing radicals generated in the resin which is broken by heat. That is, the polymer bonds are broken by heat, and the generated radicals must be taken out because the bonds of the surrounding polymer are continuously destroyed.

If the content of the phenolic antioxidant is less than 0.1% by weight, the antioxidant does not sufficiently act. If the amount of the phenolic antioxidant is more than 2.0% by weight, the effect of the phenolic antioxidant may be increased, .

Preferred examples of the hindered phenolic antioxidant include 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,6- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamido] hexane, 1,6-bis [3- Propane and tetrakis [methylene (3,5-di-tert-butyl-4-hydroxyhydrocinnamate)] methane. At this time, the weight average molecular weight May preferably be 400 or less.

Release agent

In the present invention, the release agent is added for the purpose of securing stability in the production process and securing the injection property, and the content thereof is preferably 0.1 to 2.0% by weight. When the content of the releasing agent is out of the above range, if it is added in an excessively small amount, the effect of securing the injection property is insignificant. If it is added in an excessively large amount, it may act as an impurity and cause deterioration of mechanical properties.

At this time, the release agent may be selected from the group consisting of paraffin wax, paraffin wax oxide, polyethylene wax, low molecular weight ethylene vinyl acetate, ethylene bisstearamide, erucamide, and oleamide.

The composition of the present invention may contain an antioxidant such as a colorant, a nucleating agent, a plasticizer, a phosphate compound, a hindered amine compound, a benzophenone compound, a benzotriazole compound, But are not limited to, additives such as light stabilizers such as base compounds, formaldehyde scavengers such as melamine, guanidine, and Dicyan diamide, lubricants, and the like. It is not.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are for the purpose of illustrating the present invention more specifically, and the present invention is not limited thereto.

Example  One

After the polyoxymethylene resin (Kocetal K300, Kolon Plastics) was dried at 80 DEG C for 4 hours, a thermoplastic polyurethane resin (Neothane 5080AP, Dong Sung High Chem), an ethylene-ethyl acrylate copolymer (T _m = 94 ℃), methylene diphenyl diisocyanate (4,4'-diphenyl methane diisocyanate, junseyi Chemicals), hindered phenol-based antioxidant (Songnox 1010PW, Songwon industrial Co.), and a release agent (HI-LUBE 500P, Shinwon Chemical). The mixed mixture was poured into a primary inlet of a twin-screw extruder and melt-kneaded at 190 ° C to prepare a resin composition.

The resin composition was ejected through a die into spaghetti, cooled, and made into a chip state in a pelletizer.

Example  2 to Example  5

A resin composition was prepared in the same manner as in Example 1, except that the content of ethylene-ethyl acrylate copolymer and methylenediphenyl diisocyanate was changed as shown in Table 1 below.

Comparative Example  1 to Comparative Example  8

A resin composition was prepared in the same manner as in Example 1, except that the content of thermoplastic polyurethane, ethylene-ethyl acrylate copolymer and methylenediphenyl diisocyanate was changed as shown in Table 1 below.

division
(weight%) (end) (I) (All) (la) (hemp) (bar) Example 1 79.5 17.0 3.0 0.3 0.1 0.1 Example 2 78.5 17.0 4.0 0.3 0.1 0.1 Example 3 77.5 17.0 5.0 0.3 0.1 0.1 Example 4 79.6 17.0 3.0 0.2 0.1 0.1 Example 5 79.3 17.0 3.0 0.5 0.1 0.1 Comparative Example 1 79.7 19.5 0.5 0.1 0.1 0.1 Comparative Example 2 78.8 14.0 6.0 1.0 0.1 0.1 Comparative Example 3 79.8 19.5 0.5 - 0.1 0.1 Comparative Example 4 79.8 17.0 3.0 - 0.1 0.1 Comparative Example 5 79.8 14.0 6.0 - 0.1 0.1 Comparative Example 6 79.7 20.0 - 0.1 0.1 0.1 Comparative Example 7 79.5 20.0 - 0.3 0.1 0.1 Comparative Example 8 78.8 20.0 - 1.0 0.1 0.1

(A) Polyoxymethylene: Kocetal K300 (Kolon Plastics)

(B) Thermoplastic polyurethane: Neothane 5080AP (Dongseong High Chem)

(C) Ethylene-Ethyl Acrylate Copolymer: T _m = 94 ° C

(D) Methylene diphenyl diisocyanate: 4,4'-diphenyl methane diisocyanate (Junsei Chemical)

(E) Hindered phenolic antioxidant: Songnox 1010PW (Songwon Industrial)

(F) Release agent: HI-LUBE 500P (Shinwon Chemical)

< Measurement example >

The resin compositions prepared in the above Examples and Comparative Examples were made into specimens and melt index, tensile test and Izod impact test (normal temperature and low temperature) were carried out in the following manner, and the results are shown in Table 2 .

(1) Melt Index (MI): The melt index (g / 10 min) was determined by adding 2.16 kg of another mass at 190 캜 according to ASTM D1238.

(2) Tensile strength and elongation: The tensile elongation of the test piece was measured according to ASTM D638.

(3) Impact strength (Izod impact test): According to ASTM D256, the Izod impact strength (kgf.cm/cm) was determined at 23 ° C (room temperature) and -30 ° C (low temperature) .

MI
(g / 10 min) The tensile strength
(Kgf / cm2) Tensile elongation
(%) Impact strength
(kgf · cm / cm) 23 ℃ -30 ° C Example 1 6.2 449 180 19.9 9.3 Example 2 6.1 441 184 20.4 9.4 Example 3 6.1 432 189 21.1 9.6 Example 4 7.0 445 172 19.3 9.1 Example 5 5.7 450 207 21.6 9.7 Comparative Example 1 9.1 448 122 19.0 8.9 Comparative Example 2 3.2 451 253 24.2 10.5 Comparative Example 3 9.3 447 108 14.5 8.8 Comparative Example 4 9.2 446 105 15.2 9.0 Comparative Example 5 8.9 446 101 16.1 9.3 Comparative Example 6 9.1 448 106 13.8 8.7 Comparative Example 7 6.5 449 163 14.4 9.2 Comparative Example 8 3.3 446 231 21.0 10.1

As can be seen from the results of Table 2, in the case of Comparative Example 1, Comparative Example 3 and Comparative Examples 6 to 8 in which the content of added ethylene-ethyl acrylate was small or not added at all, the tensile elongation and the impact angle . In Comparative Examples 1, 3 and 6 in which the content of isocyanate compounds was insignificant, the impact strength at low temperature was evaluated to be relatively low.

In addition, even if the content of ethylene-ethyl acrylate was appropriately added as in Comparative Example 4, even if an isocyanate compound was not added or ethylene-ethyl acrylate was not added even if an adequate amount of an isocyanate compound was added as in Comparative Example 7, The impact strength was not sufficiently secured.

In addition, when the addition amount of the ethylene-ethyl acrylate or isocyanate compound exceeded the appropriate standard as in Comparative Examples 2, 5 and 8, the melt index was remarkably lowered or the tensile elongation was not secured.

Claims (11)

A polyoxymethylene copolymer comprising 70 to 80% by weight of polyoxymethylene, 15 to 25% by weight of a thermoplastic polyurethane, 2.0 to 5.0% by weight of an ethylene-ethyl acrylate copolymer and 0.2 to 0.5% by weight of an isocyanate compound, Resin composition.
The polyoxymethylene resin composition according to claim 1, wherein the polyoxymethylene has a melting point (T _m ) measured by differential scanning calorimetry (DSC) of 160 to 180 ° C.
The polyoxymethylene resin composition according to claim 1, wherein the polyurethane has a weight average molecular weight of 40,000 to 80,000 g / mol.
2. The method of claim 1, wherein the ethylene-ethyl acrylate copolymer comprises 5 to 35 mol% of ethyl acrylate repeating units and 65 to 95 mol% of ethyl repeating units based on the total mole of polymer, (T _m ) of from 80 to 100 ° C.
The polyoxymethylene resin composition according to claim 1, wherein the isocyanate compound is at least one selected from the group consisting of an aliphatic isocyanate, an alicyclic isocyanate, an aromatic isocyanate, and a mixture thereof.
The polyoxymethylene resin composition according to claim 5, wherein the isocyanate compound is methylenediphenyl diisocyanate.
The composition according to claim 1, wherein the composition comprises 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) Bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamido] hexane, 1,6- Propionamido] propane and tetrakis [methylene (3,5-di-tert-butyl-4-hydroxyhydrocinnamate)] methane, Wherein the polyoxymethylene resin composition further comprises a polyoxymethylene resin composition.
The composition according to claim 1, wherein the composition is at least one selected from the group consisting of paraffin wax, paraffin wax, polyethylene wax, low molecular weight ethylene vinyl acetate, ethylene biststearamide, erucamide, And 0.1 to 2.0% by weight of a release agent.
The polyoxymethylene resin composition according to claim 1, wherein the composition has a melt index (MI) of 5.5 g / 10 min or more measured according to ASTM D1238.
A molded article produced from the resin composition of any one of claims 1 to 9.
The molded article according to claim 10, wherein the molded article has a tensile elongation of 150% or more as measured by ASTM D638, an Izod impact strength at room temperature of 23 占 폚 according to ASTM D256 measurement of 19 kgf.cm/cm or more, and an Izod impact And a strength of 9 kgf cm / cm or more.