KR20200062933A - Polyethylene resin composition for blow molding having a high melt tension - Google Patents

Abstract

According to the present invention, it is possible to provide a polyethylene resin composition having a high melting tension, in which, by using a maleimide-based modifier without using a peroxide crosslinking agent, parison sagging and top and bottom thickness variations during supersize hollow molding of 200 L or more can be minimized, and volatile by-products or remnant are not produced during a process of manufacturing a resin. Therefore, the present invention provides the polyethylene resin composition for hollow molding containing a maleimide-based compound, an antioxidant, and a Ziegler-Natta catalyst.

Description

Polyethylene resin composition for blow molding having a high melt tension}

The present invention relates to a polyethylene resin composition for blow molding, and more particularly, to a polyethylene resin composition for blow molding having a high melt tension.

The biggest problem in oversized blow molding of 200L or more using high-density polyethylene (HDPE) is the variation in thickness between the top and bottom of the final molded product. This thickness deviation is a phenomenon that occurs because the melt tension of the high-density polyethylene is small, and when the resin melted from the die forms a parison, the parison itself is struck by the weight of the lower part of the parison.

In the manufacture of a product by blow molding high density polyethylene (HDPE), peroxide is prescribed to HDPE in order to increase the die swell ratio or increase the environmental stress crack resistance (ESCR). And crosslinking techniques were used.

For example, in U.S. Patent No. 5,589,551, a large container was manufactured by blow molding HDPE obtained by prescribing peroxide to HDPE produced using a chromium catalyst to reduce the die swell ratio in order to reduce the weight of the container. In No. 5,486,575, peroxide was prescribed to HDPE made of a chromium catalyst to increase the environmental stress cracking resistance (ESCR).

In addition, in International Patent Application (PCT) EP2016/058812, a crosslinking agent used in a crosslinked polyethylene pipe has a high bismaleimide usage of 1.75% or higher and a crosslinking degree of 1.75% or higher, but a peroxide initiator such as commercialized Trigonox B There is a problem that requires, and in Korean Patent Publication No. 10-2008-0133724, a crosslinking process using peroxide has a problem of generating byproducts such as acetophenone, water, methane, and alpha methyl styrene as a radical reaction.

However, since these conventional patented technologies are applicable only to HDPE made of a chromium catalyst, it is difficult to apply to HDPE made of various different Ziegler Natta catalysts in terms of catalyst properties, resin properties, etc. Is not suitable for use in the manufacture of large-sized products of 200 liters or more.

In addition, the crosslinking process using peroxide has a problem of generating byproducts such as acetophenone, water, and methane as a radical reaction.

The present invention aims to provide a polyethylene resin composition for blow molding having a high melt tension that minimizes parison sagging and thickness variation at the top and bottom during large-sized blow molding of 200L or more, and does not generate volatile by-products or residues in the process of manufacturing the resin.

In order to solve the above problems, the present invention provides a polyethylene resin composition for blow molding comprising a high density polyethylene made of a maleimide compound, an antioxidant, and a Ziegler-Natta catalyst.

In addition, the high density polyethylene may be a polyethylene resin composition for blow molding, characterized in that the density is 0.945 to 0.955 g/cm 3 and the melt index (190° C., 5 kgf) is 0.01 to 0.1 g/10 min.

In addition, the antioxidant may be a polyethylene resin composition for blow molding, characterized in that it is octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

In addition, the octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate is a polyethylene for blow molding, characterized in that it contains 0.01 to 0.15 parts by weight based on 100 parts by weight of the polyethylene. It may be a resin composition.

In addition, it may be a polyethylene resin composition for blow molding, characterized in that it further comprises tris (2,4-di-tert-butylphenyl) phosphite as an antioxidant.

In addition, it may be a polyethylene resin composition for blow molding, characterized in that it comprises 0.01 to 0.1 parts by weight of the tris (2,4-di-tert-butylphenyl) phosphite relative to 100 parts by weight of the polyethylene.

In addition, the maleimide-based compound is 1,3-dimaleimide benzene, 1,4-dimaleimide benzene, 1,3-bis(maleimide methylene)benzene, 1,4-bis(maleimide methylene)benzene, 1,3-dimaleimide cyclohexane, 1,4-dimaleimide cyclohexane, 1,3-bis(maleimide methylene)cyclohexane, 1,4-bis(maleimide methylene)cyclohexane, 4,4' -Dimaleimide biphenyl, bis(4-maleimide phenyl)methane, bis(4-maleimide phenyl) ether, bis(4-maleimide phenyl)sulfone, bis(4-maleimide-3-methylphenyl)methane, Bis(4-maleide-3-chlorophenyl)methane, bis(4-maleimide-3,5-dimethylphenyl)methane, 2,2-bis(4-maleimide-3-methylphenyl)propane, 2,2 -Bis(4-maleimide-3,5-dibromophenyl)propane, bis(4-maleimide phenyl)phenylmethane, 3,4-dimaleimidephenyl-4'-maleimidephenylmethane, 1,1 -Bis(4-maleimide phenyl)-1-phenylmethane, hexamethylene-1,6-dimaleimide may be a high-density polyethylene resin composition characterized in that at least one member selected from the group consisting of.

In addition, it may be a polyethylene resin composition for blow molding, characterized in that it comprises 0.01 to 0.2 parts by weight of the maleimide-based compound relative to 100 parts by weight of the polyethylene.

According to the present invention, by using a maleimide-based modifier and an antioxidant without using a peroxide crosslinking agent, parison deflection and thickness variation in the upper and lower parts are minimized during super-large blow molding of 200L or more, and volatile by-products or residues are not generated in the process of manufacturing the resin. It is possible to provide a polyethylene resin composition for blow molding having a high melt tension.

1 is a graph showing the results of measuring the dynamic viscosity according to the angular frequency of the test example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the description of the present invention, when it is determined that a detailed description of related known technologies may obscure the subject matter of the present invention, the detailed description will be omitted. Throughout the specification, when a part “includes” a certain component, this means that other components may be further included instead of excluding other components, unless specifically stated to the contrary.

The present invention discloses a polyethylene resin composition for blow molding comprising a high density polyethylene made of a maleimide compound, an antioxidant, and a Ziegler-Natta catalyst.

In the present invention, the polyethylene resin used in the super-large blow molding of 200 liters or more is manufactured using a Ziegler-Natta catalyst, and can be by a known manufacturing method and is not particularly limited. For example, a method of preparing polyethylene in the presence of a Ziegler-Natta catalyst system in two or more continuous stirred tank reactors (CSTR) can be used, specifically the first polyethylene product from ethylene in the presence of a hydrogen and Ziegler-Natta polymerization catalyst. Is polymerized in the first reactor, and the second polyethylene product is homopolymerized to about 0 to 5% by weight in the second reactor to copolymerize α-olefin comonomer having 3 to 8 carbon atoms, wherein the first reactor is And can be polymerized under different polymerization conditions. In addition, the polyethylene product polymerized in the first reactor can be flowed to a second reactor connected in series to polymerize the second polyethylene product to produce a polyethylene resin having desired properties.

The Ziegler-Natta catalyst refers to a catalyst system composed of a combination of a main catalyst having a transition metal compound as a main component, a cocatalyst as an organometallic compound, and an electron donor, for example, a solid catalyst component centered on titanium, magnesium, and halogen and an organoaluminum compound Known catalyst systems consisting of systems can be used.

On the other hand, the high-density polyethylene resin is 0.945 ~ 0.955 g / cm3, the melt index (190 ℃, 5kgf) is 0.20 ~ 0.35 g / 10min, the weight average molecular weight 350,000 ~ 500,000 g / mol and the molecular weight distribution may be 10 ~ 25 . When the weight-average molecular weight is less than 350,000 g/mol, it may be difficult to form a large-sized blow molding over 200L, and when it exceeds 500,000g/mol, problems such as deterioration in formability and reduction in production may occur.

In the present invention, a modifier and an antioxidant containing a maleimide-based compound are used to minimize the deflection of the parison and the thickness variation in the upper and lower parts during blow molding of a large container of 200 liters or more, and volatile by-products or residues are not generated in the process of manufacturing the resin. Can be avoided.

The antioxidant may be octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. Phenol erythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], which has a greater steric hindrance, is a lungol-based antioxidant octadecyl 3-(3, which has a steric hindrance less than that of steric hindrance. The use of 5-di-tert-butyl-4-hydroxyphenyl)propionate has the advantage of increasing the viscosity more.

Alternatively, tris(2,4-di-tert-butylphenyl)phosphite may be further included as an antioxidant. Tris(2,4-di-tert-butylphenyl)phosphite has a synergistic effect when used in combination with the octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. There is an advantage that can maximize the yellowing reduction phenomenon.

Also, the tris(2,4-di-tert-butylphenyl)phosphite is contained in an amount of 0.01 to 0.1 parts by weight based on 100 parts by weight of the high density polyethylene, preferably 0.02 to 0.08 parts by weight, more preferably 0.03 to 0.07 It may include parts by weight. When the content of the tris(2,4-di-tert-butylphenyl)phosphite is less than 0.01 part by weight, the yellowing reduction effect may be insignificant, and when it is more than 0.1 part by weight, as shown in FIG. The dynamic viscosity can be lowered. In addition, the tris(2,4-di-tert-butylphenyl)phosphite serves to reduce the chain branching effect of the maleimide-based compound, thus optimizing the amount to obtain the above content range. That is, if it is contained less than 0.01 part by weight, the chain branching effect of the maleimide-based compound may be excessive, and when it is contained more than 0.1 part by weight, the chain branching effect of the maleimide-based compound may be excessive. May appear understated.

The maleimide-based compound is, for example, 1,3-dimaleimide benzene, 1,4-dimaleimide benzene, 1,3-bis(maleimide methylene)benzene, 1,4-bis(maleimide methylene)benzene, 1,3-dimaleimide cyclohexane, 1,4-dimaleimide cyclohexane, 1,3-bis(maleimide methylene)cyclohexane, 1,4-bis(maleimide methylene)cyclohexane, 4,4' -Dimaleimide biphenyl, bis(4-maleimide phenyl)methane, bis(4-maleimide phenyl) ether, bis(4-maleimide phenyl)sulfone, bis(4-maleimide-3-methylphenyl)methane, Bis(4-maleide-3-chlorophenyl)methane, bis(4-maleimide-3,5-dimethylphenyl)methane, 2,2-bis(4-maleimide-3-methylphenyl)propane, 2,2 -Bis(4-maleimide-3,5-dibromophenyl)propane, bis(4-maleimide phenyl)phenylmethane, 3,4-dimaleimidephenyl-4'-maleimidephenylmethane, 1,1 -Bis(4-maleimide phenyl)-1-phenylmethane, hexamethylene-1,6-dimaleimide, etc. are mentioned.

Further, the maleimide-based compound may be included in an amount of 0.01 to 0.20 parts by weight, preferably 0.05 to 0.15 parts by weight, and more preferably 0.08 to 0.12 parts by weight based on 100 parts by weight of the high-density polyethylene. When the content of the maleimide-based compound is less than 0.01 part by weight, the crosslinking effect may be insignificant, and when it is contained more than 0.20 part by weight, the resin viscosity is excessively increased and the moldability may be reduced due to the extrusion load. have.

In addition, the octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate may be included in an amount of 0.01 to 0.15 parts by weight based on 100 parts by weight of the polyethylene, preferably 0.01 to 0.1 parts by weight May be included. When the content of the octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate is contained less than 0.01 part by weight, the resin may be decomposed by heat in the extruder, and 0.15 parts by weight If it is included more, the effect of improving the properties may be negligible.

The polyethylene resin composition for blow molding according to the present invention has a melt index (190°C, 5 kgf) of 0.01 to 0.2 g/10min, preferably 0.05 to 0.15 g/10min, density of 0.935 to 0.955 g/cm 3, preferably 0.940 ~0.950 g/cm 3, viscosity (220° C., 0.01 rad/s) 300,000 Pa·s or more, preferably 400,000 Pa·s or more.

When the melt index (190°C, 5 kg) is less than 0.01 g/10min, there is a problem of unmolding of the container, such as poor pinch-off and container hole formation due to extrusion load and resin temperature rise in the extruder during container molding, and the melt index is 0.2 If it exceeds g/10min, the melt tension decreases and the parison sags, resulting in unmolded, uneven thickness of the molded product.

In addition, density means the weight of resin per unit volume, and it has a great influence on physical properties and processing conditions as basic properties with melt index in polyethylene. The density of the polyethylene resin affects the strength and environmental stress crack resistance (ESCR) in particular, and when the density is less than 0.935 g/cm 3, the ESCR is improved, but the strength may be weakened, and the density may be 0.955 g/cm 3. If exceeded, the ESCR may drop significantly and may not be suitable for containers requiring ESCR properties.

Hereinafter, the present invention will be described in more detail with reference to Production Examples, Examples and Comparative Examples.

Preparation Example: Preparation of Ziegler-Natta catalyst

A 300 ml sized pressure-resistant glass reactor equipped with a stirrer and an oil circulation heater was sufficiently ventilated with nitrogen, and 110 ml of hexane was charged into the reactor under a nitrogen atmosphere. 5.71 g of anhydrous magnesium dichloride was added to the reactor and stirred at room temperature. 21 ml of ethanol was slowly added over 1 hour, and stirred for 1 hour or more at a rotation speed of 300 rpm so that anhydrous magnesium dichloride and ethanol reacted sufficiently. Then, 20 ml of diethyl aluminum chloride was mixed with 20 ml of hexane, and the alkyl aluminum compound diluted to 50% was stirred in a mixture of the anhydrous magnesium dichloride and ethanol at a rotational speed of 400 rpm at 25° C., over 4 hours. It was added slowly. After the injection was completed, the stirring speed was increased to 500 rpm and reacted for 2 hours. Thereafter, 20 ml of titanium tetrachloride was slowly added to the resulting heterogeneous mixture at 25° C., maintained for 30 minutes, and then slowly heated. After injecting 0.26 ml of ethyl benzoate into the internal electron donor at 73°C, the reaction was carried out for 3 hours. When the reaction was completed, the temperature was lowered to 50°C to stop stirring, and the resulting catalyst was precipitated to remove the supernatant, and 200 ml of hexane was added, followed by rinsing sufficiently. This process was repeated 6 times or more to prepare a catalyst for polyethylene synthesis.

Example 1

A Ziegler-Natta catalyst was used to prepare a high density polyethylene resin having a melt index (190°C, 5 kgf) of 0.3 g/10 min, a density of 0.950 g/cm 3, and a weight average molecular weight of 450,000, and 100 parts by weight of the high density polyethylene resin With respect to phenol, 0.03 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate was mixed.

The phenolic antioxidant is mixed with a high density polyethylene resin and 0.1 parts by weight of hexamethylene-1,6-dimaleimide at room temperature through a tumbler mixer for 20 minutes and then dry using a single-screw extruder at a temperature of 180 to 230°C, screw rotation Extruded at a condition of 35 rpm to prepare a pellet-shaped polyethylene resin composition for blow molding.

Example 2

A Ziegler-Natta catalyst was used to prepare a high density polyethylene resin having a melt index (190°C, 5 kgf) of 0.3 g/10 min, a density of 0.950 g/cm 3, and a weight average molecular weight of 450,000, and 100 parts by weight of the high density polyethylene resin With respect to phenol-based antioxidant, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate 0.03 parts by weight is mixed, and phosphorus-based antioxidant tris(2,4-di-tert) -0.05 parts by weight of butylphenyl)phosphite was mixed.

The phenol-based antioxidant and phosphorus-based antioxidant are mixed with a high-density polyethylene resin and 0.1 parts by weight of hexamethylene-1,6-dimaleimide at room temperature through a tumbler mixer for 20 minutes, and then a temperature of 180-230 using a single-screw extruder. Extrusion under the conditions of 35 rpm, screw rotation speed to prepare a pellet-shaped polyethylene resin composition for blow molding.

Example 3

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.01 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Example 4

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.02 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Example 5

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.04 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Example 6

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.05 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Example 7

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.06 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Example 8

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.07 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Example 9

In the same manner as in Example 1, except that the phenol-based antioxidant in Example 1 was adjusted to 0.08 parts by weight of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. A pellet-shaped polyethylene resin composition for blow molding was prepared.

Comparative Example 1

A high-density polyethylene resin having a melt index of 0.04 g/10 min, a density of 0.950 g/cm 3, and a weight average molecular weight of 450,000 is prepared using a Ziegler-Natta catalyst, and a phenolic antioxidant relative to 100 parts by weight of the high density polyethylene resin. As octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate 0.03 parts by weight, tris(2,4-di-tert-butylphenyl)phosphite as phosphorus antioxidant 0.05 parts by weight were mixed.

The high-density polyethylene resin mixed with the phenol-based antioxidant and phosphorus-based antioxidant is dry mixed at room temperature through a tumbler mixer for 20 minutes, and then extruded using a single-screw extruder at a temperature of 180 to 230° C. and a screw rotation speed of 35 rpm to hollow the pellets. A polyethylene resin composition for molding was prepared.

Comparative Example 2

A high-density polyethylene resin having a melt index of 0.04 g/10 min, a density of 0.950 g/cm 3, and a weight average molecular weight of 450,000 is prepared using a Ziegler-Natta catalyst, and a phenolic antioxidant relative to 100 parts by weight of the high density polyethylene resin. As a pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] 0.03 parts by weight was mixed.

The phenolic antioxidant is mixed with a high-density polyethylene resin and 0.1 parts by weight of hexamethylene-1,6-dimaleimide at room temperature through a tumbler mixer for 20 minutes and then dry using a single-screw extruder at a temperature of 180 to 230°C, screw rotation Extruded at a condition of 35 rpm to prepare a pellet-shaped polyethylene resin composition for blow molding.

Test Example 1

The contents (unit: parts by weight) of 100 parts by weight of the high-density polyethylene resin of the resin compositions of Examples 1 and 2 and Comparative Examples 1 and 2 used in the measurement of the dynamic viscosity of FIG. 1 are shown in Table 1 below.

Looking at the results of measuring the dynamic viscosity of FIG. 1, an increase in the dynamic viscosity at low frequencies (0.01 to 0.1 rad/s) means that hexamethylene-1,6-dimaleimide was activated, and hexamethylene-1,6-di It was confirmed that the dynamic viscosity of the high-density polyethylene resin prescribing hexamethylene-1,6-dimaleimide was significantly increased than that of the high-density polyethylene resin not prescribing maleimide, indicating that the melt tension of the resin was improved.

In addition, in the present invention, it was confirmed that the degree of expression of hexamethylene-1,6-dimaleimide varies depending on the type of antioxidant and the amount of antioxidant. Specifically, phenol erythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], which has a large steric hindrance, is a lungol-based antioxidant Octadecyl 3-( It can be seen that when using 3,5-di-tert-butyl-4-hydroxyphenyl)propionate, the viscosity increases more.

Test Example 2

The following physical properties were measured for the resin composition of the above example, and the results are shown in Table 2 below. Table 2 below shows the change in the content of phenol-based antioxidant octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with respect to 0.1 parts by weight of hexamethylene-1,6-dimaleimide. It is a table measuring the test examples (1) to (6) among the properties according to

(1) Melt Index (MI): measured according to ASTM D1238 under a load of 190°C and 5 kg.

(2) Density (density): was calculated by measuring the weight of the resin composition contained in a 10ℓ container.

(3) Sagging rate (sagging): Using a blow molding machine, molding the parison at a rotation speed of 50 rpm and a temperature of 190°C, and immediately after exiting the die, the initial parison length (ℓ ₀ ) and 30 seconds after exiting the die The deflection ratio (=[(ℓ-ℓ ₀ ) / ℓ ₀ ]×100) was calculated by measuring the length (ℓ).

(4) Impact strength: measured at 23°C according to ASTM D256.

(5) Variation in container thickness: 200 L drum containers were prepared using the compositions of the above Examples and Comparative Examples, the thickness of the bottom portion and the thickness of the top side of the produced vessel were measured, and the difference was calculated (thickness of the bottom portion- Thickness of the top surface).

(6) Dynamic Viscosity: The prepared HDPE resin pellets were measured at 220° C. and 0.01 to 500 rad/s using an ARES Rheometer instrument (Anton Parr, MCR 302). 1 is a graph showing the results of a dynamic viscosity measurement.

Referring to Table 2, it can be seen that in the case of a high-density polyethylene resin composition comprising a maleimide compound and an antioxidant according to the present invention, the melt index is low and the viscosity is large. In addition, it is possible to predict that the thickness variation during blow molding of a large container of 200 liters or more with a sag ratio of 0% or less is minimized, and this can be confirmed through a decrease in the thickness deviation of the upper and lower parts of a 200 liter drum container.

In addition, the content of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate as an antioxidant is the most sagging ratio, container thickness variation and viscosity in the range of 0.01 to 0.06 parts by weight. It is excellent, and it can be seen that the effect of improving physical properties decreases when more than 0.07 parts by weight is included. Therefore, it can be confirmed that there is a specific content range capable of securing suitable melt tension in order to optimize the impact strength, deflection ratio, container thickness variation, and viscosity of an oversized container of 200L or more.

As described above, the high-density polyethylene resin composition according to the present invention has a high melt tension (see melt index, viscosity, sag ratio, etc.), thus minimizing the deflection of the parison and the thickness variation in the upper and lower parts when forming an oversized container of 200L or more, and not using peroxide. Therefore, there is an advantage in that volatile by-products or residues are not generated in the manufacturing process of the resin.

The preferred embodiments of the present invention have been described above in detail. The description of the present invention is for illustrative purposes, and those skilled in the art to which the present invention pertains will understand that it is possible to easily modify to other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is indicated by the following claims rather than the description of the present invention, and all changes or modified forms derived from the meaning, scope and equivalent concepts of the claims are interpreted to be included in the scope of the present invention. Should be.

Claims (8)

A polyethylene resin composition for blow molding comprising a high density polyethylene made of a maleimide compound, an antioxidant, and a Ziegler-Natta catalyst. According to claim 1,
The high-density polyethylene has a density of 0.945 ~ 0.955g / cm3 and a melt index (190 ℃, 5kgf) is a polyethylene resin composition for blow molding, characterized in that 0.01 ~ 0.1g / 10min. According to claim 1,
The antioxidant is octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, a polyethylene resin composition for blow molding, characterized in that. According to claim 3,
The octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate is a polyethylene resin composition for blow molding, characterized in that it contains 0.01 to 0.15 parts by weight based on 100 parts by weight of the polyethylene. . The method of claim 3 or 4,
A blow molding polyethylene resin composition further comprising tris(2,4-di-tert-butylphenyl)phosphite as an antioxidant. The method of claim 5,
The tris (2,4-di-tert-butylphenyl) phosphite with respect to 100 parts by weight of the polyethylene 0.01 to 0.1 parts by weight of a polyethylene resin composition for blow molding, characterized in that it comprises. The method according to claim 1 or 2,
The maleimide-based compound is 1,3-dimaleimide benzene, 1,4-dimaleimide benzene, 1,3-bis(maleimide methylene)benzene, 1,4-bis(maleimide methylene)benzene, 1, 3-dimaleimide cyclohexane, 1,4-dimaleimide cyclohexane, 1,3-bis(maleimide methylene)cyclohexane, 1,4-bis(maleimide methylene)cyclohexane, 4,4'-di Maleimide biphenyl, bis(4-maleimide phenyl)methane, bis(4-maleimide phenyl)ether, bis(4-maleimide phenyl)sulfone, bis(4-maleimide-3-methylphenyl)methane, bis( 4-maleide-3-chlorophenyl)methane, bis(4-maleimide-3,5-dimethylphenyl)methane, 2,2-bis(4-maleimide-3-methylphenyl)propane, 2,2-bis (4-maleimide-3,5-dibromophenyl)propane, bis(4-maleimide phenyl)phenylmethane, 3,4-dimaleimidephenyl-4'-maleimidephenylmethane, 1,1-bis (4-maleimide phenyl)-1-phenylmethane, hexamethylene-1,6-dimaleimide, a high-density polyethylene resin composition, characterized in that at least one member selected from the group consisting of. The method of claim 7,
The maleimide compound 0.01 to 0.2 with respect to 100 parts by weight of the polyethylene A polyethylene resin composition for blow molding, comprising parts by weight.

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