KR20210036731A - Long fiber reinforced polyolefin resin composition and molded parts formed therefrom - Google Patents

Abstract

The present invention relates to a long fiber-reinforced polyolefin resin composition comprising glass fibers having a large aspect ratio, a polyolefin resin and a flame retardant, and a molded article formed therefrom. More particularly, the present invention relates to a long-fiber reinforced polyolefin resin composition for controlling the aspect ratio of glass fibers and for improving flame retardancy by containing the glass fibers in a polyolefin resin in the form of pellets, and to a molded article formed therefrom.

Description

Long fiber reinforced polyolefin resin composition and molded article formed therefrom {LONG FIBER REINFORCED POLYOLEFIN RESIN COMPOSITION AND MOLDED PARTS FORMED THEREFROM}

The present invention relates to a long fiber-reinforced polyolefin resin composition and a molded article formed therefrom, and specifically, to a long fiber-reinforced polyolefin resin composition capable of implementing a molded article having excellent physical properties and flame retardancy, and a molded article formed by injection molding the same.

Fiber reinforced plastic (FRP) generally refers to a composite material in which a matrix of unsaturated polyester is reinforced by using glass fiber as a reinforcement material. Plastic has moldability, corrosion resistance, light weight and high strength, and is widely used in helmets, bathtubs, and boats. It has the advantage of low cost. New materials such as carbon fiber, aramid fiber, boron fiber, etc. are used as reinforcing materials, and more advanced resins are used as a matrix, which is widely used in aircraft parts, space materials, golf clubs, and tennis rackets.

On the other hand, polyolefin resins have excellent stiffness and heat resistance due to crystallinity, high tensile strength, and desirable electrical properties or chemical stability based on the resin structure, and are widely used in various fields as a molding material that is easy to mold. Has become.

However, since the polyolefin resin has flammability due to its chemical structure, it has been solved by adding various flame retardants in order to impart flame retardant properties. Among them, the halogen-based flame retardant has excellent effect compared to other flame retardants, so even if a small amount is added compared to other organic or inorganic flame retardants, excellent flame retardancy can be secured, but there is a problem that it is not easy to use due to the harmfulness of the halogen-based flame retardant.

Therefore, in order to solve this problem, there is a need for a technology for a polyolefin resin capable of securing flame retardancy even without using a halogen-based flame retardant and maintaining a low specific gravity even if an inorganic flame retardant is included.

The present invention relates to a long fiber-reinforced polyolefin resin composition comprising a glass fiber having a large aspect ratio, a polyolefin resin, and a flame retardant, and a molded article formed therefrom, wherein the aspect ratio of the glass fiber is adjusted, and the glass fiber is incorporated into a pellet-type polyolefin resin. It relates to a long fiber-reinforced polyolefin resin composition that is included to improve flame retardancy, and a molded article formed therefrom.

However, the problem to be solved by the present invention is not limited to the above-mentioned problems, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

An exemplary embodiment of the present invention provides a long fiber-reinforced polyolefin resin composition comprising a glass fiber having a length of 6 mm or more and 15 mm or less, a polyolefin resin, and a flame retardant.

Another embodiment of the present invention provides a molded article formed by injection molding the long fiber-reinforced polyolefin resin composition according to an exemplary embodiment of the present invention.

The long fiber-reinforced polyolefin resin composition according to an embodiment of the present invention has excellent physical properties by including glass fibers having a large aspect ratio in the polyolefin resin, and excellent flame retardancy can be secured even when a non-halogen flame retardant is used.

The molded article according to another embodiment of the present invention has an effect of maintaining physical properties while improving flame retardancy.

The effects of the present invention are not limited to the above-described effects, and effects that are not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

In the present specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

Hereinafter, the present invention will be described in more detail.

An embodiment of the present invention provides a long fiber-reinforced polyolefin resin composition comprising a glass fiber having a length of 6 mm or more and 15 mm or less, a polyolefin resin, and a flame retardant.

The long fiber-reinforced polyolefin resin composition according to an embodiment of the present invention has excellent physical properties by including glass fibers having a large aspect ratio in the polyolefin resin, and excellent flame retardancy can be secured even when a non-halogen flame retardant is used.

Specifically, according to an embodiment of the present invention, the length of the glass fiber may be 6 mm or more and 15 mm or less. Specifically, the length of the glass fiber may be 6.5 mm or more and 14.5 mm or less, 7 mm or more and 14 mm or less, or 7.5 mm or more and 13.5 mm or less. By controlling the length of the glass fiber within the above-described range, it is possible to improve the physical properties of the polyolefin resin composition.

According to an embodiment of the present invention, the polyolefin may be an olefin homopolymer, or may include other comonomers in addition to the olefin. The content of the comonomer is preferably 0.5 to 5% by weight based on the olefin. As the comonomer, an alpha-olefin having 2 to 10 carbon atoms that does not overlap with the olefin used may be used, for example, ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, and one or more selected from the group consisting of mixtures thereof. .

According to an embodiment of the present invention, the glass fiber may preferably be a surface-treated glass fiber. The surface treatment is a resin composition by fiber reinforcement by making it possible to mix well between the inorganic glass fiber and the organic polyolefin resin to further enhance the surface smoothness, and at the same time to facilitate adhesion between the glass fiber and the polyolefin resin. It improves the physical properties of the glass fiber and prevents deterioration of the product due to the separation between the glass fiber and the polyolefin resin. The surface treatment of the glass fiber may be a coupling agent, preferably an epoxy, mercapto, vinyl, and silane-based coupling agent having an amine functional group, and most preferably may be surface-treated with an epoxy silane. Epoxysilane as such a coupling agent can be used by purchasing commercially supplied ones from domestic and overseas leading manufacturers to those with ordinary knowledge in the art, and surface treatment with the epoxysilane will also be understood by those skilled in the art. It can be understood, and it can be understood that it can be performed according to the instructions of the above manufacturers.

According to an embodiment of the present invention, the glass fiber may be included in an amount of 10 parts by weight or more and 60 parts by weight or less based on 100 parts by weight of the polyolefin resin. Specifically, the glass fiber may be 15 parts by weight or more and 55 parts by weight or less, 20 parts by weight or more and 50 parts by weight or less, 25 parts by weight or more and 45 parts by weight or less, or 30 parts by weight or more and 40 parts by weight or less, based on 100 parts by weight of the polyolefin resin. I can. By controlling the content of the glass fiber within the above-described range, it is possible to improve the physical properties.

According to an embodiment of the present invention, the polyolefin resin may be included in an amount of 40 parts by weight or more and 90 parts by weight or less based on 100 parts by weight of the composition. Specifically, the polyolefin resin may be 45 parts by weight or more and 85 parts by weight or less, 50 parts by weight or more and 80 parts by weight or less, 55 parts by weight or more and 75 parts by weight or less, or 60 parts by weight or more and 70 parts by weight or less based on 100 parts by weight of the composition. . By controlling the content of the polyolefin resin within the above-described range, the specific gravity of the molded article injection-molded with the long fiber-reinforced polyolefin resin composition can be controlled, and mechanical properties can be prevented from deteriorating.

According to an embodiment of the present invention, the polyolefin resin has a flow index of 10 to 300 g/10 minutes, preferably 20 to 200 g/10 minutes, and most preferably 40 to 150 g/10 minutes at 230°C. It is desirable for molding thin and complex structured articles.

According to an embodiment of the present invention, the flame retardant may be included in an amount of 15 parts by weight or more and 35 parts by weight or less based on 100 parts by weight of the composition. Specifically, the flame retardant may be 17 parts by weight or more and 33 parts by weight or less, 20 parts by weight or more and 30 parts by weight or less, 22 parts by weight or more and 28 parts by weight or less, or 24 parts by weight or more and 26 parts by weight or less based on 100 parts by weight of the composition. By controlling the content of the flame retardant within the above-described range, it is possible to prevent excessive deterioration of physical properties and improve flame retardancy of a molded article injection-molded with the long fiber-reinforced polyolefin resin composition.

According to an embodiment of the present invention, the glass fiber may have an aspect ratio of 20 to 200. Specifically, the glass fiber may have an aspect ratio of 30 to 190, 40 to 180, 50 to 170, 60 to 160, 70 to 150, 80 to 140. By adjusting the aspect ratio within the above-described range, it is possible to improve tensile strength or impact strength, which are mechanical properties of a molded article injection-molded with the long fiber-reinforced polyolefin resin composition.

According to an embodiment of the present invention, the polyolefin resin may be included in the form of pellets. Specifically, the polyolefin resin is preferably in the form of LFT (Long Fiber Thermoplastic) pellets. When the polyolefin resin is in the form of a pellet, the glass fiber having a large aspect ratio is not cut and the aspect ratio is maintained, and may be included in the polyolefin resin, thereby improving the physical properties of the molded article. In addition, since the polyolefin resin is included in the LFT (Long Fiber Thermoplastic) pellet form, it does not pass through the screw of the extruder compared to the compounding pellet, so that damage to the glass fiber can be minimized.

According to an embodiment of the present invention, the pellet may include the glass fiber. Specifically, the pellet may include glass fibers having a large aspect ratio, and the glass fibers having a large aspect ratio are not cut and are contained in the polyolefin resin while maintaining the aspect ratio, so that the strength of the molded article may be improved.

According to an embodiment of the present invention, the pellet may be included in an amount of 70 parts by weight or more and 80 parts by weight or less based on 100 parts by weight of the composition. Specifically, the pellet may be 71 parts by weight or more and 79 parts by weight or less, 72 parts by weight or more and 78 parts by weight or less, 73 parts by weight or more and 77 parts by weight or less, or 74 parts by weight or more and 76 parts by weight or less based on 100 parts by weight of the composition. By controlling the content of the pellets within the above-described range, it is possible to improve the physical properties of the molded article.

According to an embodiment of the present invention, the flame retardant may be a flame retardant master batch. Since the flame retardant is used as a flame retardant master batch, the content of the flame retardant can be easily adjusted, the dispersibility of the flame retardant in the resin composition can be improved, and the content of the flame retardant in the resin composition can be uniform, so that the flame retardant of the molded article It can prevent the occurrence of variation in properties and properties.

According to an embodiment of the present invention, the flame-retardant masterbatch may be a non-halogen-based flame-retardant masterbatch. By using the flame-retardant non-halogen-based flame-retardant master batch, the harmfulness can be reduced compared to the halogen-based flame retardant.

According to an embodiment of the present invention, the non-halogen-based flame-retardant masterbatch may be an expandable phosphorus-based flame-retardant masterbatch, an expandable nitrogen-based flame-retardant masterbatch, or an expandable phosphorus-nitrogen-based flame-retardant masterbatch. By selecting the above-described flame retardant masterbatch, it is possible to easily adjust the content of the flame retardant contained in the composition from low to high content, through which flame retardancy and physical properties can be maximized.

In addition, the long fiber-reinforced polyolefin resin composition further contains at least one additive selected from among lubricants, antioxidants, light stabilizers, release agents, pigments, dyes, inorganic fillers, and coupling agents within a range that does not affect physical properties. can do.

Another embodiment of the present invention provides a molded article formed by injection molding the long fiber-reinforced polyolefin resin composition according to an embodiment of the present invention.

The molded article according to an embodiment of the present invention has an effect of maintaining physical properties while improving flame retardancy.

Specifically, according to an embodiment of the present invention, the molded article is injection-molded with a long fiber-reinforced polyolefin resin composition prepared by dry blending, for example, a pellet containing glass fiber and a polyolefin resin and a flame-retardant master batch. It may be formed by.

Further, the long fiber-reinforced polyolefin resin composition is heated and melted in an injection molding apparatus, and the melted composition can be processed into various types of molded products such as automobile parts, electric and electronic parts, and industrial materials.

According to an embodiment of the present invention, injection molding may be performed at an injection temperature of 180° C. or more and 220° C. or less and a mold temperature of 60° C. or less. By controlling the injection temperature and the mold temperature to the above-described temperature, it is possible to prevent the flame retardant property sensitive to heat from being denatured.

According to an embodiment of the present invention, the molded article may be an automobile part, a housing of an electric and electronic product, or an industrial part. Specifically, since the molded article is used for the above-described purpose, it is not easily ignited in the molded article when a fire occurs due to excellent flame retardancy, and the molded article has a low specific gravity and is used as various parts, thereby reducing the weight of the product.

Hereinafter, examples will be described in detail in order to describe the present invention in detail. However, the embodiments according to the present invention may be modified in various forms, and the scope of the present invention is not construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more completely describe the present invention to those of ordinary skill in the art.

Example One

After mixing 100 parts by weight of polypropylene resin (LG Chem, SEETEC H7700) and 35.7 parts by weight of glass fiber (Owens corning, SE4805), which is a polyolefin resin, a twin-screw extruder (SM Platec) with a long fiber impregnation die was used. Using, melting/kneading at 270°C to prepare LFT pellets comprising a polypropylene resin and glass fibers having a length of 6 mm to 15 mm and a diameter of 10 to 20 μm. The pellets were 8 mm to 12 mm long.

A long fiber-reinforced polyolefin resin composition was prepared by dry blending 76 parts by weight of the pellet containing the polypropylene resin and glass fiber and 24 parts by weight of a highly concentrated expansion type phosphorus-nitrogen flame-retardant masterbatch (PRESAFER, EPFR-110DL MB).

The long fiber-reinforced polyolefin resin composition was injection-molded under conditions of an injection temperature of 180°C or more and 220°C or less and a mold temperature of 60°C or less to form a molded article.

Example 2

In Example 1, a molded article was prepared in the same manner as in Example 1, except that a low-concentration expansion-type phosphorus-nitrogen-based flame-retardant masterbatch (PRESAFER, EPFR-110DL MB) was used instead of a high-concentration expansion phosphorus-nitrogen-based flame-retardant masterbatch Formed.

Comparative example One

In Example 1, a molded article was formed in the same manner as in Example 1, except that the length of the glass fiber was 5 mm.

Comparative example 2

In Example 1, a molded article was formed in the same manner as in Example 1, except that the length of the glass fiber was 20 mm.

Comparative example 3

In Example 1, a molded article was formed in the same manner as in Example 1, except that a powder flame retardant (PRESAFER, EPFR-110DL) was used instead of the highly concentrated expandable phosphorus-nitrogen flame-retardant masterbatch.

Comparative example 4

In Example 1, a molded article was formed in the same manner as in Example 1, except that a halogen-based flame retardant (Albemarle, Saytex8010) was used instead of the highly concentrated expandable phosphorus-nitrogen flame-retardant masterbatch.

Comparative example 5

In Example 1, a molded article was formed in the same manner as in Example 1, except that the highly concentrated expandable phosphorus-nitrogen-based flame-retardant masterbatch was not used.

Test example 1 (Measurement of flame retardancy class)

After cutting the molded products of Examples and Comparative Examples to have a thickness of 1.5 mm, respectively, a UL94 Vertical Burning Test was performed to check the flame retardancy grade, which is shown in Table 1 below.

Test example 2 (Tensile strength measurement)

After cutting the molded products of Examples and Comparative Examples to have a thickness of 3.2 mm, respectively, the tensile strength was measured according to ISO527 conditions, which are shown in Table 1 below.

Test example 3 (Impact strength measurement)

After cutting the molded products of the Examples and Comparative Examples to have a thickness of 6.4 mm, respectively, the impact strength was measured according to ISO180 conditions, which are shown in Table 1 below.

Test example 4 (Measure specific gravity)

The specific gravity of the molded articles of Examples and Comparative Examples was measured according to ISO1183 conditions.

Flame retardancy class (Class) Specific gravity (g/cm ³ ) Tensile strength (MPa) Impact strength (MPa) Example 1 V-0 1.19 99 14 Example 2 V-0 1.19 98 15 Comparative Example 1 V-0 1.19 85 11 Comparative Example 2 V-2 1.19 98 14 Comparative Example 3 V-2 1.2 90 12 Comparative Example 4 V-0 1.18 65 6 Comparative Example 5 - 1.02 110 18

As shown in Table 1, it was confirmed that Examples 1 and 2 using the expandable phosphorus-nitrogen-based flame-retardant masterbatch had high flame-retardant grades, and improved tensile strength and impact strength, thereby improving mechanical properties.

In contrast, in Comparative Example 1, it was confirmed that the tensile strength and impact strength were decreased due to the short length of the glass fiber, and in Comparative Example 2, it was confirmed that the flame retardant property was decreased due to the long length of the glass fiber. Further, Comparative Example 3 confirmed that the flame retardant properties were deteriorated by using a powder flame retardant that does not correspond to the expandable phosphorus-nitrogen flame retardant master batch. In addition, in Comparative Example 4, when the halogen-based flame retardant was included, it was confirmed that not only harmful but also physical properties were deteriorated. In Comparative Example 5, when the flame retardant was not included, it was confirmed that the flame retardant properties were excessively deteriorated so that the flame retardancy grade could not be measured.

Claims (12)

A long fiber-reinforced polyolefin resin composition comprising a glass fiber having a length of 6 mm or more and 15 mm or less, a polyolefin resin, and a flame retardant.
The method of claim 1,
The glass fiber is a long fiber-reinforced polyolefin resin composition contained in an amount of 10 parts by weight or more and 60 parts by weight or less based on 100 parts by weight of the polyolefin resin.
The method of claim 1,
The polyolefin resin is a long fiber-reinforced polyolefin resin composition contained in an amount of 40 parts by weight or more and 90 parts by weight or less based on 100 parts by weight of the composition.
The method of claim 1,
The flame retardant is a long fiber-reinforced polyolefin resin composition containing 15 parts by weight or more and 35 parts by weight or less based on 100 parts by weight of the composition.
The method of claim 1,
The glass fiber is a long fiber-reinforced polyolefin resin composition having an aspect ratio of 20 to 200.
The method of claim 1,
The polyolefin resin is a long fiber-reinforced polyolefin resin composition that is included in the form of a pellet.
The method of claim 6,
The pellet is a long fiber-reinforced polyolefin resin composition containing the glass fiber.
The method of claim 1,
The flame retardant is a flame-retardant master batch of long fiber reinforced polyolefin resin composition.
The method of claim 8,
The flame-retardant masterbatch is a long fiber-reinforced polyolefin resin composition that is a non-halogen-based flame-retardant masterbatch.
The method of claim 9,
The non-halogen-based flame-retardant masterbatch is an expandable phosphorus-based flame-retardant masterbatch, an expandable nitrogen-based flame-retardant masterbatch, or an expandable phosphorus-nitrogen-based flame-retardant masterbatch.
A molded article formed by injection molding the long fiber-reinforced polyolefin resin composition according to any one of claims 1 to 10.
The method of claim 11,
The molded article is a molded article that is an automobile part, a housing of an electric and electronic product, or an industrial part.