KR20170013847A - Thermoplastic resin composition comprising recycled ABS resin - Google Patents

Abstract

The present invention relates to a thermoplastic resin containing a recycled ABS resin. More particularly, the present invention relates to a thermoplastic resin composition comprising a recycled ABS resin as a base resin, talc, a polyphenylene ether-based resin, an ionomer, polyamide, and a flame retardant. The thermoplastic resin composition comprising a recycled ABS resin is environment-friendly and has excellent molding processability with increased mechanical properties such as flame retardancy, impact strength, and the like.

Description

[0001] The present invention relates to a thermoplastic resin composition containing recycled ABS resin,

TECHNICAL FIELD The present invention relates to a thermoplastic resin containing a reclaimed ABS resin, and more particularly, to a thermoplastic resin composition using a reclaimed ABS as a base resin and having improved mechanical properties such as tensile strength and molding processability.

Recently, it is necessary to develop eco - friendly policies that are based on environment - friendly policies that restrict the use of hazardous substances that can cause environmental pollution problems in advanced countries and require them to use recycled products.

By recycling plastic wastes as raw materials for new plastic products without landfilling, it is possible to prevent various water pollution and soil pollution caused by landfilling, solve the difficulties of selecting landfill sites, It is possible to save the foreign currency by replacing the plastic raw material.

In this regard, recycling of plastic wastes is attempted by recycling the wastes into small pieces and pellets.

On the other hand, in the acrylonitrile-butadiene-styrene copolymer resin (ABS resin), a copolymer obtained by grafting an acrylonitrile monomer, which is an aromatic vinyl compound and a styrene monomer, and a vinyl cyanide compound to a central butadiene rubber- Styrene-acrylonitrile copolymer resin (SAN resin).

The ABS resin thus produced has excellent properties such as processability, impact resistance, strength, and melt strength, and is widely used for various electric, electronic, and general-purpose parts requiring excellent appearance due to excellent colorability and gloss. However, in the case of internal and external materials of electrical and electronic products subjected to repeated stress, since they have to be resistant to breakage or breakage for a certain period of time, they are required to have excellent impact resistance and to withstand some chemical damage such as acetic acid and industrial oil .

Japanese Patent Application No. 10-0937473 discloses a method of regenerating ABS resin. However, when ABS is recycled, the melt processing characteristics are degraded due to aging of the material and mixing of foreign matters, and the impact strength, And mechanical properties such as tensile strength were remarkably decreased.

In the case of recycled ABS resin, there is a need to develop an optimum regeneration method of mixing recycled ABS with an additive into a composite material, in order to have an injection molded article having optimal mechanical strength and processability at the same time.

Korean Patent No. 10-0937473

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide an environmentally friendly thermoplastic resin composition containing recycled ABS having mechanical properties and melt processability similar to those of conventional ABS resins.

It is an object of the present invention to provide a thermoplastic resin composition which is remarkably improved in processability, flame retardancy and mechanical strength even when recycled ABS resin is applied.

The present invention relates to a thermoplastic resin composition comprising recycled ABS resin, talc, polyphenylene ether resin, ionomer, polyamide, and flame retardant.

The present invention relates to an ABS resin composition comprising 10 to 50 parts by weight of talc, 1 to 30 parts by weight of a polyphenylene ether resin, 1 to 5 parts by weight of an ionomer, 1 to 5 parts by weight of a polyamide, Based on the total weight of the thermoplastic resin composition.

The present invention also provides a resin molded article using the thermoplastic resin composition.

The thermoplastic resin composition comprising the reclaimed ABS resin of the present invention has excellent moldability and mechanical properties such as flame retardancy and impact strength are greatly improved.

Particularly, the thermoplastic resin composition according to the present invention is eco-friendly and has an effect of lowering the unit cost of the process by using the recycled ABS resin while maintaining the physical properties of the conventional ABS resin.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments and methods for measuring the properties of the thermoplastic resin composition of the present invention will be described in detail. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. It will be apparent to those skilled in the art that, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, And a description of the known function and configuration will be omitted.

The present invention relates to an ABS resin composition comprising 10 to 50 parts by weight of talc, 1 to 30 parts by weight of a polyphenylene ether resin, 1 to 5 parts by weight of an ionomer, 1 to 5 parts by weight of a polyamide, By weight of the thermoplastic resin composition.

The reclaimed ABS resin of the present invention means a recycled ABS resin obtained by a method of sorting, crushing, washing and drying from waste plastic parts. The pulverized recycled ABS resin has a pellet-shaped diameter in the range of 0.1 to 10 mm, but is not limited thereto.

The ABS resin of the present invention is an acrylonitrile-butadiene-styrene copolymer having excellent mechanical properties, thermal properties and processability, and can be produced by various methods such as bulk polymerization, emulsion polymerization and suspension polymerization.

The ABS resin may be copolymerized with a vinyl cyanide compound (e.g., acrylonitrile, methacrylonitrile and the like) in the presence of a diene rubber (e.g., polybutadiene, butadiene-styrene copolymer, butadiene- As a graft copolymer obtained by polymerizing an aromatic vinyl compound (styrene, alpha-methylstyrene, dimethylstyrene, vinyltoluene, etc.), conventional ABS resins known in the art can be used without limitation.

The reclaimed ABS resin of the present invention preferably has a weight average molecular weight of 15,000 to 300,000, but is not limited to, excellent mechanical properties and molding processability.

The thermoplastic resin composition of the present invention may contain talc to ensure excellent heat resistance and mechanical properties. The talc has a formula of Mg ₃ (OH) ₂ Si ₄ O ₁₀ , which is a kind of inorganic filler, and talc, which is magnesium silicate hydrate. The talc preferably has a plate shape and has an average particle diameter of 0.1 to 10 μm or less But are not limited thereto.

In the present invention, adding 10 to 50 parts by weight of talc to 100 parts by weight of the recycled ABS resin is preferable, but not limited thereto, in view of excellent mechanical properties and processability.

The thermoplastic resin composition of the present invention may contain a polyphenylene ether-based resin (hereinafter abbreviated as PPE) for imparting heat resistance. PPE applies hindered phenol as a monomer, and is a poly (2,6-dimethyl-1,4-phenylene) ether, a poly (2,6- Propylene-1,4-phenylene) ether, poly (2-methyl-6-ethyl- Ether, poly (2-ethyl-6-propyl-1,4-phenylene) ether, poly (2,6- (2,6-diethyl-1,4-phenylene) ether and poly (2,3,6-trimethyl-1,4-phenylene) ether, 2,3,6-trimethyl-1,4-phenylene) ether, and preferably one or more compounds selected from the group consisting of poly (2,6-dimethyl-1,4 -Phenylene) ether can be used.

The degree of polymerization of the polyphenylene ether is not particularly limited, but it is preferably, but not limited to, 0.2 to 0.8 as measured in a chloroform solvent at 25 캜 in consideration of thermal stability and workability of the resin composition. The polyphenylene ether may be used singly or in a mixture of two or more kinds in an appropriate ratio.

The polyphenylene ether resin preferably contains 1 to 30 parts by weight based on 100 parts by weight of the reclaimed ABS resin, because it can exhibit excellent molding processability and impact resistance.

The thermoplastic resin composition of the present invention may contain an ionomer. The ionomer means that a part of the carboxylic acid group of a copolymer of ethylene acrylic acid or ethylene methacrylic acid is replaced with a metal cation. Preferable ionomers used in the present invention include olefin copolymers such as ethylene, And a carboxylic acid in which metal ions such as zinc (Zn), sodium (Na), magnesium (Mg), and lithium (Li) are neutralized, and an unsaturated carboxylic acid such as acryl or methacrylic acid Copolymers can be used.

Commercially available ionomers include, but are not limited to, SURLYN 8140 in neutralized grade by sodium and SURLYN 9910 in neutralized grade by zinc.

The blending amount of the ionomer used in the present invention is preferably 1 to 5 parts by weight based on 100 parts by weight of the reclaimed ABS resin, in order to improve interfacial compatibility.

In the present invention, polyamide may be included to improve mechanical properties. The blending amount of the polyamide is preferably 1 to 5 parts by weight based on 100 parts by weight of the reclaimed ABS resin, so as to exhibit excellent mechanical strength.

The polyamide may be any one or two or more components selected from, for example, nylon 4.6, nylon 6, nylon 6.6, nylon 6.10, nylon 7, nylon 8, nylon 9, nylon 11, nylon 12, nylon 46 and amorphous polyamide , Or a mixture thereof.

Particularly, in the present invention, the ionomer and the polyamide are used in a reclaimed ABS resin to overcome the deterioration of workability and mechanical properties, and can remarkably improve the miscibility at the interface as an unpredictable and unpredictable cause. As a result, not only the processability is greatly improved, but also the mechanical properties can be remarkably increased.

The thermoplastic resin composition of the present invention may further comprise any one or two or more flame retardants selected from the group consisting of an aromatic phosphoric acid ester flame retardant having a phenol structure, an ammonium polyphosphate flame retardant, or a pentaerythritol flame retardant.

The aromatic phosphate ester having a phenol structure includes triphenyl phosphate and an aromatic phosphate ester having a hindered phenol structure, such as tri (2,6-dimethylphenyl) phosphate and tri (2,6-ditertiarybutylphenyl) phosphate. The above phosphoric acid esters may be used singly or in combination, but it is preferable to apply a compound having a molecular weight of 1,500 or more in the structure thereof, but it is not limited thereto.

The ammonium polyphosphate flame retardant used in the present invention has a non-inflammable gas (steam, carbon dioxide, nitrogen and the like) and carbonaceous residue only at the decomposition point due to contact with the high temperature or the flame, and the generation of corrosive gas, halogen gas or toxic gas But it is not limited thereto. Specifically, it is possible to use, for example, a trade name Budit 3076 (manufactured by Budenheim), a trade name SUMISAFE P (manufactured by Sumitomo Chemical Co., Ltd.), a trade name EXOLITE 422

The compound having a polyhydric alcohol group used as a flame retardant in the present invention may include pentaerythritol. This acts as a char promoter to help generate char at the time of combustion, and dipentaerythritol or tripentaerythritol can be used to impart this role.

In the present invention, the flame retardant is preferably mixed in an amount of 1 to 5 parts by weight, more preferably 1 to 3 parts by weight, with respect to 100 parts by weight of the reclaimed ABS resin.

The composition of the present invention may further comprise at least one additive selected from the group consisting of plasticizers, heat stabilizers, antioxidants, light stabilizers, lubricants, release agents, pigments, antistatic agents, dyes, crosslinking agents and antibacterial agents.

Further, the present invention can provide a resin molded article produced from the thermoplastic resin composition. The resin molded article according to the present invention may be in the form of a pellet, a sheet, a film, a pipe, a tube, a fiber, or the like, but is not limited thereto.

The molding of the thermoplastic resin composition of the present invention can be carried out by techniques in the art. But is not limited to, for example, injection molding, extrusion molding, rotary molding, calendar molding, compression molding, vacuum molding and blow molding.

The properties of the thermoplastic resin of the present invention and comparative examples are described in detail, and the thermoplastic resin composition and physical property measurement results are shown in Tables 1 and 2 below.

Property measurement

1) Izod Impact Strength: A 3.2 mm thick test piece was molded using an injection molding machine and the Izod impact strength ((1/8 ", 23 ° C) was measured according to ASTM D256.

2) Tensile strength: The tensile strength was measured according to ASTM D638.

3) Flexural Modulus: A specimen of 6 mm thickness was measured according to ASTM D790 with a span of 100 mm and a speed of 10 mm / min.

4) Flame Retardancy: The vertical combustion test was carried out in the vertical phase (V-0) of UL Subject 94 (Underwriters Laboratories Inc.) "Flammability test of plastic materials for mechanical parts" The thickness of the specimen is 1/12 inch.

5) Processability: When no hot spot was generated during machining, & cir &, & cir &

[Example 1]

Only the ABS material was recovered after collecting waste plastics. Foreign matter on the surface

And then crushed to an average size of 3 mm and then washed. The washed waste plastic crushed material was dried and extruded to obtain a reclaimed ABS in pellet form.

1 kg of recycled ABS resin, 300 g of talc, 200 g of polyphenylene ether resin (P-401, Asahi Kasei Japan), 20 g of ionomer (Surlyn 1601, DuPont), 20 g of nylon 6 (ZYTEL 7301, DuPont) , And 20 g of a flame retardant (triphenyl phosphate, TPP, Daihachi, Japan) were stirred in a Hensel mixer for 30 minutes. The mixture was melt-extruded at 200 to 260 DEG C using an extruder having a diameter of 30 mm to prepare pellets. The obtained pellets were dried at 100 ° C. for 3 hours and molded into test pieces for measuring the physical properties using an injection molding machine in which the maximum temperature of the cylinder was fixed at 230 ° C. The properties were measured and the results are shown in the following Table 2 .

[Example 2]

As shown in the following Table 1, except that 400 g of talc was added, the same procedure as in Example 1 was conducted.

[Example 3]

As shown in the following Table 1, except that 200 g of talc was added, the same procedure as in Example 1 was conducted.

[Example 4]

As shown in the following Table 1, except that 100 g of a polyphenylene ether resin was added, the same procedure as in Example 1 was conducted.

[Comparative Example 1]

As shown in the following Table 1, 700 g of talc was added, and the same procedure as in Example 1 was conducted.

[Comparative Example 2]

As shown in the following Table 1, the same procedure as in Example 1 was carried out except that recycled ABS resin, talc alone was used.

[Comparative Example 3]

Except that only recycled ABS resin, talc, and polyphenylene ether resin were used as shown in Table 1 below.

[Comparative Example 4]

As shown in the following Table 1, the same procedure as in Example 1 was carried out except that no flame retardant was used.

(unit:
Weight part) Playback ABS Talc Polyphenylene ether Ionomer Polyamide Flame retardant Example 1 100 30 20 2 2 2 Example 2 100 40 20 2 2 2 Example 3 100 20 20 2 2 2 Example 4 100 30 10 2 2 2 Comparative Example 1 100 70 20 2 2 2 Comparative Example 2 100 30 - - - - Comparative Example 3 100 30 20 - - - Comparative Example 4 100 30 20 2 2 -

Izod impact strength
(kgfcm / cm) The tensile strength
(kgf / cm2) Flexural modulus
(kgf / cm2) Flammability
(VO) Processability Example 1 11.3 499 18200 pass ○ Example 2 13.1 548 19410 pass ○ Example 3 10.3 403 17900 pass ○ Example 4 10.7 407 17600 pass ○ Comparative Example 1 6.3 495 16100 pass X Comparative Example 2 6.7 497 15900 Combustion X Comparative Example 3 7.0 495 16200 Combustion X Comparative Example 4 10.7 505 17500 Combustion ○

As shown in Table 2, the impact strength and workability of Comparative Examples 1 to 3 are remarkably lower than those of Examples.

In Comparative Example 1 in which talc was used in excess, 70 parts by weight of talc was used, and the impact strength was lowered, resulting in poor workability.

It is also seen that the addition of ionomers and polyamides improves the compatibility between the resins and suppresses hot spots that can occur during processing, thereby improving the workability.

 The thermoplastic resins of Examples 1 to 4 of the present invention exhibit excellent flame retardancy and are excellent in mechanical strength such as impact strength, tensile strength, flexural modulus and the like, and workability is remarkably improved.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the above description should not be construed as limiting the scope of the present invention defined by the limits of the following claims.

Claims (7)

10 to 50 parts by weight of talc, 1 to 30 parts by weight of a polyphenylene ether resin, 1 to 5 parts by weight of an ionomer, 1 to 5 parts by weight of a polyamide and 1 to 5 parts by weight of a flame retardant are added to 100 parts by weight of a recycled ABS resin And a thermoplastic resin composition. The method according to claim 1,
The polyphenylene ether resin may be at least one selected from the group consisting of poly (2,6-dimethyl-1,4-phenylene) ether, poly (2,6-diethyl- Ethyl-1,4-phenylene) ether, poly (2-methyl-6-propyl- (2-ethyl-6-propyl-1,4-phenylene) ether and poly (2,6-diphenyl-1,4-phenylene) ether. The method according to claim 1,
Wherein the ionomer is an olefin copolymer containing methacrylic acid or acrylic acid. The method according to claim 1,
Wherein the polyamide is any one or two or more selected from nylon 4.6, nylon 6, nylon 6.6, nylon 6.10, nylon 7, nylon 8, nylon 9, nylon 11, nylon 12, nylon 46, and amorphous polyamide. The method according to claim 1,
Wherein the flame retardant is one or more selected from the group consisting of an aromatic phosphate ester flame retardant having a phenol structure, an ammonium polyphosphate flame retardant, and a pentaerythritol flame retardant. The method according to claim 1,
Wherein the thermoplastic resin composition further comprises at least one additive selected from the group consisting of a plasticizer, a heat stabilizer, an antioxidant, a light stabilizer, a lubricant, a releasing agent, a pigment, an antistatic agent, a dye, a crosslinking agent and an antibacterial agent. A resin molded article produced from the thermoplastic resin composition according to any one of claims 1 to 6.