KR102161374B1 - Thermoplastic resin composition and resin article using the same - Google Patents

Abstract

The present invention is a base resin 100 comprising (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer 14% to 25% by weight and (B) 75% to 86% by weight of (meth)acrylate resin Parts by weight; And 25 parts by weight to 35 parts by weight of an antistatic resin containing at least one of (C) a polyether esteramide block copolymer, a polyalkylene glycol, and a polyamide based on 100 parts by weight of the base resin. It relates to the composition.

Description

Thermoplastic resin composition and molded article manufactured therefrom TECHNICAL FIELD [THERMOPLASTIC RESIN COMPOSITION AND RESIN ARTICLE USING THE SAME}

The present invention relates to a thermoplastic resin composition. More specifically, the present invention relates to a thermoplastic resin composition excellent in transparency, antistatic properties, impact resistance and antibacterial properties.

Thermoplastic resins have excellent mechanical properties, processability, and exterior properties, and are widely used as interior/exterior materials for electric/electronic products, interior/exterior materials for automobiles, and exterior materials for buildings.

On the other hand, in the field of products such as home appliances, medical devices, and toys, the application of transparent and translucent materials is expanding as a recent market trend, and demand for high impact and high flow characteristics is increasing as the design difficulty increases.

Conventionally, it is known that an impact aid such as a silicone compound is used to enhance the impact resistance of a thermoplastic resin. However, when an impact aid is included, the fluidity of the thermoplastic resin composition may be lowered, or whitening may occur on the product surface when left at a low temperature.

In addition, there is a problem that the thermoplastic resin containing an excessive amount of an impact aid is easily scratched, has high haze characteristics, and has low total light transmittance, making it difficult to apply as a product requiring a transparent appearance.

Accordingly, the demand for a thermoplastic resin composition that can be applied to various products such as home appliances, automatic office equipment, medical equipment, toys, etc. is increasing due to excellent surface resistance characteristics and antibacterial properties while simultaneously increasing transparency and impact resistance. Are doing.

As a related prior art document, there is Korean Laid-Open Patent Publication No. 10-2012-0042802.

One object of the present invention is to provide a thermoplastic resin composition excellent in transparency, antistatic properties, impact resistance and antibacterial properties, and a resin molded article prepared therefrom.

One embodiment of the present invention includes (A) (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer 14% to 25% by weight and (B) 75% to 86% by weight of (meth)acrylate resin 100 parts by weight of the base resin; And 25 parts by weight to 35 parts by weight of an antistatic resin containing at least one of (C) a polyether esteramide block copolymer, a polyalkylene glycol, and a polyamide based on 100 parts by weight of the base resin. It relates to the composition.

The weight ratio of (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer and (B) (meth)acrylate resin in the base resin may be 1:3 to 1:6.

The (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer is an aromatic vinyl-based monomer and a vinyl cyanide-based monomer 20% to 40% by weight; And it may be a copolymer of a mixture comprising 60% to 80% by weight of (meth) acrylate monomer.

The resin for anti-static (C) may contain a polyether esteramide block copolymer.

The polyether ester amide block copolymer may include a polyether-ester block in an amount of 10% to 95% by weight.

The base resin may have a refractive index of 1.25 to 1.75.

The thermoplastic resin composition may have a difference in refractive index between the base resin and the antistatic resin represented by Equation 1 below of 0.3 or less.

[Equation 1]

Refractive index difference = ｜(R1-R2)｜

In Equation 1, R1 is the refractive index of the base resin, and R2 is the refractive index of the antistatic resin.

According to the JIS Z 2801 antibacterial evaluation method, the thermoplastic resin composition is inoculated with Staphylococcus aureus and E. coli in a specimen of 5 cm × 5 cm, and the antibacterial activity against staphylococcus calculated according to Equation 2 below is 2.0 to 7.0, and E. coli The antimicrobial activity value for may be 1.0 to 7.5.

[Equation 2]

Antibacterial activity value = log (M1/M2)

In Equation 2, M1 is the number of bacteria after 24 hours incubation at 35°C, RH 90% for a blank specimen, and M2 is 35°C for a thermoplastic resin composition specimen, after 24 hours incubation at RH 90% conditions. It is the number of bacteria.

The thermoplastic resin composition may have a haze of 10% or less as measured by ASTM D1003 for a specimen having a thickness of 2.5 mm, and a total light transmittance of 80% or more.

The thermoplastic resin composition may have a surface resistance of 10×10 ⁸ Ω/□ or less as measured at 23° C. and 50%RH according to ASTM D250 for a 2.5 mm-thick specimen.

The thermoplastic resin composition may satisfy Equation 3 below.

[Equation 3]

1000 mm ≤ Id

In Equation 3, Id is the height of the drop weight measured by the Dupont drop test method using a 1 kg metal weight for a specimen injected with a thickness of 2 mm.

Another embodiment of the present invention relates to a molded article formed from the above-described thermoplastic resin composition.

The present invention has the effect of the present invention to provide a thermoplastic resin composition excellent in transparency, antistatic properties, impact resistance and antibacterial properties, and a resin molded article prepared therefrom.

One embodiment of the present invention includes (A) (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer 14% to 25% by weight and (B) 75% to 86% by weight of (meth)acrylate resin 100 parts by weight of the base resin; And 25 parts by weight to 35 parts by weight of an antistatic resin containing at least one of (C) a polyether esteramide block copolymer, a polyalkylene glycol, and a polyamide based on 100 parts by weight of the base resin. It relates to the composition.

Through this, the present invention can provide a thermoplastic resin composition having excellent transparency, antistatic properties, impact resistance and antibacterial properties. In particular, the thermoplastic resin composition has excellent transparency, antistatic properties, impact resistance, and antibacterial properties in a good balance, so it can be more useful industrially when applied to applications such as housings, toys, etc. .

(A) (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer

The (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer according to an embodiment of the present invention is a copolymer of a vinyl cyanide monomer, an aromatic vinyl monomer, and a monomer including (meth)acrylate, and a thermoplastic resin composition It increases the fluidity, thermal stability and compatibility of the product, and realizes transparency and impact resistance.

However, the (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer may be a non-rubber copolymer that does not contain a rubber-based polymer.

In a specific embodiment, the (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer is a monomer mixture comprising a vinyl cyanide monomer, an aromatic vinyl monomer, and a (meth)acrylate in a conventional polymerization process with a polymerization initiator. Can be manufactured through.

A radical polymerization initiator may be used as the initiator, but is not limited thereto. The initiator may be, for example, a peroxide, a persulfate, a cyanoated azo compound, a redox initiator, or the like, but is not limited thereto. In addition, the polymerization process of the copolymer may be carried out by a known polymerization method such as emulsion polymerization, suspension polymerization, and bulk polymerization.

In a specific embodiment, the vinyl cyanide monomer may include one or more of acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile, α-chloroacrylonitrile, and fumaronitrile, Not limited. These may be applied alone or in combination of two or more.

In a specific embodiment, the content of the vinyl cyanide monomer is 1% to 50% by weight, for example, 5% to 45% by weight of the (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer (100% by weight) %, specifically 10% to 30% by weight. Within the above range, the thermoplastic resin composition may have excellent fluidity, impact resistance, and appearance characteristics.

In a specific embodiment, the aromatic vinyl-based monomer is, for example, styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, pt-butylstyrene, ethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, di Bromostyrene, vinyl naphthalene, and the like may be used, but are not limited thereto. These may be applied alone or in combination of two or more.

In a specific embodiment, the content of the aromatic vinyl-based monomer is 1% to 50% by weight, for example, 5% to 45% by weight of the (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer (100% by weight) %, specifically 10% to 30% by weight. In the above range, the heat resistance and impact resistance of the thermoplastic resin composition may be more excellent.

In a specific example, the (meth)acrylate monomer may be substituted or unsubstituted acrylic acid, methacrylic acid, and alkyl esters thereof, and may be used alone or in combination of two or more.

In a specific embodiment, the (meth)acrylate monomer is (meth)acrylate is a substituted or unsubstituted linear or branched alkyl (meth)acrylic acid ester having 1 to 20 carbon atoms, for example, methyl (meth)acrylate , Ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, ethylhexyl (meth)acrylate , Octyl (meth)acrylate, (meth)acrylate, decyl (meth)acrylate, and may include at least one of esters thereof, but is not limited thereto. These may be applied alone or in combination of two or more.

In a specific embodiment, the content of the (meth)acrylate monomer is from 10% by weight to 90% by weight, for example from 40% by weight, based on the weight (100% by weight) of the (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer. It may be 80% by weight, specifically 60% to 80% by weight. In the above range, the impact resistance, fluidity, and appearance characteristics of the thermoplastic resin composition may be more excellent.

In a specific embodiment, the (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer is an aromatic vinyl-based monomer and a vinyl cyanide-based monomer 20% to 40% by weight; And it may be a copolymer of a mixture comprising 60% to 80% by weight of (meth) acrylate monomer. In the above range, the impact resistance, fluidity, and appearance characteristics of the thermoplastic resin composition may be more excellent.

In a specific embodiment, the (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer has a weight average molecular weight of 30,000 g/mol to 200,000 g/mol, specifically 35,000 g/mol to 150,000 g/mol, more specifically, It may be from 40,000 g/mol to 110,000 g/mol. In the above range, the thermoplastic resin composition may have more excellent thermal stability, heat resistance and fluidity.

The (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer is included in an amount of 14% to 25% by weight of 100% by weight of the base resin. When the content of the (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer is less than 14% by weight, it is difficult to implement thermal stability and impact resistance, and when it exceeds 25% by weight, it is difficult to realize transparent appearance characteristics. Prevention properties may not be sufficient.

In a specific embodiment, the (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer may be included in an amount of 14% to 20% by weight and 15% to 19% by weight. Within the above range, impact resistance, transparency, antistatic properties, etc. of the thermoplastic resin composition may be more excellent.

(B) (meth)acrylate resin

The (meth)acrylate resin according to an embodiment of the present invention is a polymer of a (meth)acrylate-based monomer, and contains a homopolymer of one (meth)acrylate-based monomer or two or more (meth)acrylate-based monomers. It is possible to use a copolymer included as a polymerization unit. Through this, it is possible not only to impart excellent transparency to the thermoplastic resin, but also to improve physical properties such as impact resistance.

In a specific embodiment, the (meth)acrylate monomer is (meth)acrylate is an unsubstituted linear or branched alkyl (meth)acrylic acid ester having 1 to 20 carbon atoms, for example, methyl (meth)acrylate, ethyl (Meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, ethylhexyl (meth)acrylate, octyl It may include at least one of (meth)acrylate, (meth)acrylate, decyl (meth)acrylate, and esters thereof, but is not limited thereto. These may be applied alone or in combination of two or more.

In a specific embodiment, the (meth)acrylate monomer may be methyl methacrylate, methyl acrylate, or the like. In this case, it is advantageous to control the refractive index while further increasing the transparency and impact resistance of the base resin by acting in combination with the above-described (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer.

The (meth)acrylate resin is included in 75% to 86% by weight of 100% by weight of the base resin. When the content of the (meth)acrylate resin is less than 75% by weight, the haze is high and the total light transmittance is low, making it difficult to realize transparent appearance characteristics, and when it exceeds 86% by weight, the surface resistance is high and the antistatic property is insufficient and excellent. It is difficult to achieve impact resistance.

In a specific embodiment, the (meth)acrylate resin may be included in 78% to 85% by weight, 80% to 85% by weight of the base resin. Within the above range, impact resistance, transparency, antistatic properties, etc. of the thermoplastic resin composition may be more excellent.

(C) Resin for antistatic

The antistatic resin according to an embodiment of the present invention is capable of improving antibacterial properties and antistatic properties of a thermoplastic resin composition (or a specimen prepared therefrom), and includes a polyether esteramide block copolymer, a polyalkylene glycol, and It may contain one or more of polyamides.

In a specific embodiment, the (C) antistatic resin may contain a polyetheresteramide block copolymer. In this case, antibacterial properties and antistatic properties of the thermoplastic resin composition may be further improved, and compatibility with the aforementioned base resin may be improved. The polyether esteramide block copolymer may be a copolymer including a polyamide block, a polyether block, and an ester unit.

In a specific embodiment, the polyether ester amide block copolymer may be a polyether ester amide having a bisphenol skeleton such as bisphenol A, for example, a polyamide having a carboxyl group at both ends and a polyethylene oxide bisphenol A glycidyl A polyether ester amide formed by bonding with an ether can be used.

In an embodiment, the polyether esteramide block copolymer is an amino carboxylic acid, lactam, or diamine-dicarboxylate having 6 or more carbon atoms; Polyalkylene glycol; And a dicarboxylic acid having 4 to 20 carbon atoms; it may be a block copolymer of the reaction mixture.

As the salt of the amino carboxylic acid, lactam, or diamine-dicarboxylic acid having 6 or more carbon atoms, ω-aminocapronic acid, ω-aminoenanthic acid, ω-aminocaprylic acid, ω-aminopelconic acid, ω- Aminocarboxylic acids such as aminocapric acid, 1,1-aminoundecanoic acid, and 1,2-aminododecanoic acid; Lactams such as caprolactam, enanthlactam, caprylactam and lauryllactam; And salts of diamines and dicarboxylic acids, such as salts of hexamethylenediamine-adipic acid and salts of hexamethylenediamine-isophthalic acid. For example, a salt of 1,2-aminododecanoic acid, caprolactam, hexamethylenediamine-adipic acid, and the like can be used.

The polyalkylene glycol is polyethylene glycol, poly(1,2- and 1,3-propylene glycol), polytetramethylene glycol, polyhexamethylene glycol, block or random copolymer of ethylene glycol and propylene glycol, ethylene glycol and tetra A copolymer of hydrofuran, etc. can be illustrated. For example, polyethylene glycol, a copolymer of ethylene glycol and propylene glycol, etc. can be used.

Examples of the dicarboxylic acid having 4 to 20 carbon atoms include terephthalic acid, 1,4-cyclohexacarboxylic acid, sebacic acid, adipic acid, and dodecanocarboxylic acid.

In a specific embodiment, the bond of the amino carboxylic acid, lactam, or diamine-dicarboxylic acid salt having 6 or more carbon atoms; and the polyalkylene glycol; may be an ester bond, and the amino carboxylic acid, lactam, or The bond of the diamine-dicarboxylic acid salt; and the dicarboxylic acid having 4 to 20 carbon atoms; may be an amide bond, and the polyalkylene glycol; and the dicarboxylic acid having 4 to 20 carbon atoms; It can be a combination.

In an embodiment, the polyetheresteramide block copolymer comprises a polyether-ester block in an amount of 10% to 95% by weight, specifically 15% to 90% by weight, more specifically 20% to 85% by weight. I can. In the above range, mechanical properties, antibacterial properties, antistatic properties, etc. of the thermoplastic resin composition may be more excellent.

In a specific embodiment, the antistatic resin is included in an amount of 25 parts by weight to 35 parts by weight based on 100 parts by weight of the base resin. If less than 25 parts by weight of the antistatic resin is used, the antibacterial and antistatic properties of the thermoplastic resin composition may be deteriorated, and if it exceeds 35 parts by weight, it is difficult to sufficiently exhibit the impact resistance of the thermoplastic resin composition, and the haze increases. In addition, there is a concern that the total light transmittance is lowered, resulting in a decrease in appearance characteristics.

In a specific embodiment, the antistatic resin may be included in an amount of 27 parts by weight to 33 parts by weight, and 28 parts by weight to 32 parts by weight, based on 100 parts by weight of the base resin. Within the above range, impact resistance, transparency, antistatic properties, etc. of the thermoplastic resin composition may be more excellent.

(D) additive

The thermoplastic resin composition according to an embodiment of the present invention may further include additives included in a conventional thermoplastic resin composition. Examples of the additives include flame retardants, fillers, antioxidants, anti-drip agents, lubricants, release agents, nucleating agents, stabilizers, pigments, dyes, mixtures thereof, and the like, but are not limited thereto. When using the additive, the content may be 0.001 parts by weight to 40 parts by weight, for example, 0.1 parts by weight to 10 parts by weight, based on 100 parts by weight of the thermoplastic resin.

The thermoplastic resin composition of the present invention has a weight ratio of (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer and (B) (meth)acrylate resin in the base resin is 1:3 to 1:6, specifically May be 1:3 to 1:5. Within the above range, the balance of transparency, antistatic properties, impact resistance and antibacterial properties of the thermoplastic resin composition may be more excellent.

In the thermoplastic resin composition of the present invention, (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer and (B) (meth)acrylate resin are combined to reduce the difference in refractive index between the base resin and the antistatic resin. Through this, it is possible to lower the haze and further improve the total light transmittance, thereby realizing more excellent appearance characteristics.

The base resin may have a refractive index of 1.25 to 1.75, specifically 1.45 to 1.55. Within the above range, excellent optical properties with high transparency, high total light transmittance and low haze can be implemented.

In the thermoplastic resin composition of the present invention, the difference in refractive index between the base resin and the antistatic resin represented by the following Formula 1 may be 0.3 or less, specifically 0.2 or less, and more specifically 0.15 or less.

[Equation 1]

Refractive index difference = ｜(R1-R2)｜

In Equation 1, R1 is the refractive index of the base resin, and R2 is the refractive index of the antistatic resin. In this case, while the transparency of the thermoplastic resin is further improved, the effect of reducing haze and colorability may be more excellent when the resin for static elimination is included in a high content.

The thermoplastic resin composition of the present invention may be in the form of a pellet or powder obtained by mixing the above-described constituents and melt-extruded at 200°C to 280°C, for example, 220°C to 250°C using a conventional twin screw extruder.

The thermoplastic resin composition of the present invention has an antibacterial effect against various bacteria including staphylococcus, E. coli, and the like.

In a specific example, the thermoplastic resin composition is inoculated with Staphylococcus aureus and Escherichia coli in a 5 cm × 5 cm specimen according to the JIS Z 2801 antibacterial evaluation method, and the antibacterial activity value against staphylococcus aureus calculated according to Equation 2 below is 2.0 to It is 7.0, and the antimicrobial activity against E. coli may be 1.0 to 7.5.

[Equation 2]

Antibacterial activity value = log (M1/M2)

In Equation 2, M1 is the number of bacteria after 24 hours incubation at 35°C, RH 90% for a blank specimen, and M2 is 35°C for a thermoplastic resin composition specimen, after 24 hours incubation at RH 90% conditions. It is the number of bacteria. In this case, since the thermoplastic resin can implement excellent antibacterial properties, it has advantageous properties for use in products such as home appliances and toys.

In a specific embodiment, the thermoplastic resin composition may have a haze of 10% or less and a total light transmittance of 80% or more as measured by ASTM D1003 in a 2.5 mm-thick specimen. In this case, since the thermoplastic resin can implement excellent transparency, it has advantageous properties for use in home appliances, toys, and products having various properties requiring transparency.

In a specific example, the thermoplastic resin composition may have a surface resistance of 10×10 ⁸ Ω/□ or less as measured at 23° C. and 50%RH according to ASTM D250 in a 2.5 mm thick specimen. In this case, since the thermoplastic resin can implement excellent antistatic properties and voltage characteristics, it has advantageous properties for use in home appliances, office automation equipment, toys, and various products requiring excellent electrical properties.

In a specific embodiment, the thermoplastic resin composition may satisfy Equation 3 below.

[Equation 3]

1000 mm ≤ Id

In Equation 3, Id is the height of a drop weight measured by a Dupont drop test method using a metal weight of 1 kg for a molded product specimen having a thickness of 2 mm. In this case, since the thermoplastic resin can realize excellent impact resistance, it has advantageous properties for use in various products requiring impact properties.

Another embodiment of the present invention relates to a molded article formed from the above-described thermoplastic resin composition. The antimicrobial thermoplastic resin composition may be prepared in the form of pellets, and the prepared pellets may be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such a molding method is well known by those of ordinary skill in the field to which the present invention belongs.

As such, the molded article formed from the thermoplastic resin composition of the present invention described above has excellent transparency, antistatic properties, impact resistance, and antimicrobial properties, so it is particularly industrial when applied to applications such as housings, toys, etc. It can be used more usefully.

Example

Hereinafter, the present invention will be described in more detail through examples, but these examples are for the purpose of description only and should not be construed as limiting the present invention.

(A) (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer

(a1) 73.85% by weight of methyl methacrylate, 5% by weight of acrylonitrile, and 21.15% by weight of styrene were added to perform suspension polymerization, followed by dehydration and drying to bead having a molecular weight of about 105,000 g/mol. ) Type of methyl methacrylate-styrene-acrylonitrile-based copolymer was prepared and used.

(B) (meth)acrylate resin

Polymethyl methacrylate resin (manufacturer: Lotte MRC, product name: TF-9) was used.

(C) Resin for antistatic

A resin (manufacturer: Sanyo, product name: PELECTRON AS) containing a polyether esteramide block copolymer was used.

Example 1 and Comparative example 1-4: Preparation of thermoplastic resin composition

Each of the above constituents was added in an amount as shown in Table 1 below, and then extruded at 230°C to prepare a pellet. Extrusion was performed using a twin-screw extruder with L/D=36 and diameter of 45 mm, and the prepared pellets were dried at 80°C for 4 hours or more, and then injected in a 6 Oz injection machine (molding temperature 250°C, mold temperature: 60°C) Was prepared. The prepared specimens were evaluated for physical properties by the following method, and the results are shown in Table 2 below.

ingredient Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 (A) 17 56 56 43 30 (B) 83 44 44 57 70 (C) 30 - 30 30 30

In Table 1, the weight basis of (A) and (B) is the weight percent of the total (100%) of (A) + (B), and the weight basis of (C) is (A) + (B) It is parts by weight based on a total of 100 parts by weight.

Property evaluation method

(1) Haze (%) and total light transmittance (%): For each 2.5 mm-thick injection specimen, it was measured using a haze meter according to ASTM D1003.

(2) Surface resistance (Ω/□): For each 2.5 mm-thick injection specimen, surface resistance was measured at 23°C and 50%RH according to ASTM D250.

(3) Antimicrobial activity value: According to the JIS Z 2801 antibacterial evaluation method, Staphylococcus aureus and E. coli were inoculated into a specimen of 5 cm × 5 cm size, and the antimicrobial activity value was calculated according to Equation 2.

[Equation 2]

Antibacterial activity value = log (M1/M2)

(In Equation 2, M1 is the number of bacteria after 24 hours incubation at 35°C and RH 90% for a blank specimen, and M2 is 35°C for a thermoplastic resin composition specimen and 24 hours incubation at RH 90% condition. Is the number of bacteria.)

(4) DuPont drop test: According to the DuPont drop test method, for a 2mm-thick injection specimen, 0.5kg of rubber and 1kg of metal are dropped 20 times from a height of 1000 mm to check whether cracks occur. I did. When the DuPont drop test was passed because no crack occurred, it was evaluated as x, and when the DuPont drop test was not passed due to cracking.

(5) Appearance characteristics: When the previously measured haze is 10% or less, the total light transmittance is 80% or more, and the appearance characteristics are excellent, the haze exceeds 10% or the total light transmittance is less than 90%, and the appearance characteristics are insufficient × Evaluated as.

(6) Electrical characteristics: When the previously measured surface resistance is less than 10 x 10 ⁸ Ω/□ and the electrical characteristics are satisfactory suitable for use in home appliances, etc.○, surface resistance exceeds 10 x 10 ⁸ Ω/□ Therefore, if the electrical properties were not suitable, it was evaluated as x.

(7) Impact resistance: According to the DuPont drop test method, 1 kg of a metal weight was dropped 20 times from a height of 1000 mm for a 2 mm-thick injection specimen, and the average drop height was measured, and then the conditions of Equation 3 were satisfied. Was confirmed, and the impact resistance was evaluated. When the following Formula 3 was satisfied, it was evaluated as ○, and when not satisfied, it was evaluated as x.

[Equation 3]

1000 mm ≤ Id

In Equation 3, Id is the height of a drop by a DuPont drop test using a 1kg metal weight for a 2mm-thick injection specimen.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Total light transmittance (%) 83.84 92 80.58 81.25 83.56 Haze (%) 6.26 0.5 26.8 27.5 11.23 Surface resistance
(Ω/□) 2*10 ⁸ 2*10 ¹⁶ 1.2*10 ⁹ 8*10 ⁸ 2*10 ⁸ Antibacterial
(Staphylococcus) 4.6 0 4.6 4.6 4.6 Antibacterial
(E. coli) 3.0 0 3.0 3.0 3.0 DuPont drop test
(Rubber, 0.5kg) ○ × ○ ○ ○ DuPont drop test
(Metal, 1 kg) ○ × ○ ○ ○ Appearance characteristics ○ ○ × × × Electrical compatibility ○ × × ○ ○ Impact resistance ○ × ○ ○ ○

From the results of Table 2, (A) (meth) acrylate-aromatic vinyl-vinyl cyanide copolymer 14% to 25% by weight and (B) (meth) acrylate resin 75% to 86% by weight included 100 parts by weight of the base resin; And 25 parts by weight to 35 parts by weight of an antistatic resin containing at least one of (C) polyetheresteramide block copolymer, polyalkylene glycol, and polyamide based on 100 parts by weight of the base resin. In Example 1, it can be seen that transparency, antistatic properties, impact resistance and antibacterial properties are all excellent, and their balance is excellent.

On the other hand, (A) (meth) acrylate-aromatic vinyl-vinyl cyanide-based copolymer in an excess amount, and (B) (meth) acrylate resin is included in the scope of the present invention in Comparative Examples 1 to 4 Due to the lack of compatibility between the resin and the antistatic resin, it can be seen that it is difficult to implement excellent electrical compatibility, impact resistance, or excellent appearance characteristics. In particular, in the case of Comparative Example 1, which does not contain an antistatic resin, the surface resistance is very high, cracks are easily generated, and antibacterial properties cannot be implemented, so all of the electrical properties, impact resistance, and antibacterial properties are not suitable.

Simple modifications or changes of the present invention can be easily implemented by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (6)

(A) (meth)acrylate-aromatic vinyl-vinyl cyanide copolymer 14% to 25% by weight and (B) 100 parts by weight of a base resin including 75% to 86% by weight of a (meth)acrylate resin; And
Based on 100 parts by weight of the base resin (C) 25 parts by weight to 35 parts by weight of an antistatic resin containing a polyether esteramide block copolymer; and a thermoplastic resin composition comprising,
The weight ratio of (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer and (B) (meth)acrylate resin in the base resin is 1:3 to 1:6,
The thermoplastic resin composition has a haze of 10% or less, a total light transmittance of 80% or more, as measured by ASTM D1003 in a 2.5 mm thick specimen, and satisfies the following (a) to (c):
(a) According to JIS Z 2801 antibacterial evaluation method, staphylococcus and Escherichia coli were inoculated into a specimen with a size of 5 cm × 5 cm, and the antimicrobial activity against staphylococcus calculated according to Equation 2 was 2.0 to 7.0, and against Escherichia coli Antibacterial activity value is 1.0 to 7.5
[Equation 2]
Antibacterial activity value = log (M1/M2)
(In Equation 2, M1 is the number of bacteria after 24 hours incubation at 35°C and RH 90% for a blank specimen, and M2 is 35°C for a thermoplastic resin composition specimen and 24 hours incubation at RH 90% condition. After the number of bacteria);
(b) a surface resistance of 10×10 ⁸ Ω/□ or less as measured at 23° C. and 50% RH by ASTM D250 in a 2.5 mm-thick specimen; And
(c) satisfying the following equation 3
[Equation 3]
1000 mm ≤ Id
(In Equation 3, Id is the height of the drop weight measured by the Dupont drop test method using a weight of 1 kg for a specimen injected with a thickness of 2 mm).
The method of claim 1,
The (A) (meth)acrylate-aromatic vinyl-vinyl cyanide-based copolymer is an aromatic vinyl-based monomer and a vinyl cyanide-based monomer 20% to 40% by weight; And (meth) acrylate monomer 60% by weight to 80% by weight of a mixture comprising a copolymer of a thermoplastic resin composition.
The method of claim 1,
The (C) antistatic resin contains a polyetheresteramide block copolymer, and the polyetheresteramide block copolymer contains 10% to 95% by weight of a polyether-ester block.
The method of claim 1,
The base resin is a thermoplastic resin composition having a refractive index of 1.25 to 1.75.
The method of claim 1,
A thermoplastic resin composition in which the difference in refractive index between the base resin and the antistatic resin represented by the following formula 1 is 0.3 or less:
[Equation 1]
Refractive index difference = ｜(R1-R2)｜
In Equation 1, R1 is the refractive index of the base resin, and R2 is the refractive index of the antistatic resin.
A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 5.