KR102489058B1 - Low-smoke thermoplastic resin composition for transportation with excellent impact resistance, flame retardancy, chemical resistance and heat release property and molded article comprising the same - Google Patents

Abstract

The present invention relates to a low fugitive thermoplastic resin composition for transport having excellent impact resistance, flame retardancy, chemical resistance, and heat release characteristics, and a molded product including the same, and more particularly, to polycarbonate resin, sulfonate flame retardant, polytetrafluoroethylene micro By including powder and inorganic hydroxide flame retardant in a specific amount, it has excellent impact resistance and flame retardancy (1.5mm/V-0, UL-94), shows a low heat emission rate in the event of a fire to prevent fire spread, and prevents fire spread during combustion. Improved low smoke characteristics that prevent the occurrence of smoke can prevent deterioration of the properties of thermoplastic resin compositions and molded products due to disinfectants and disinfectants used for quarantine against Covid-19, and to ensure the safety of many occupants or residents from fire. It can be easily applied to applications for interior/exterior materials (buses, trains, ships, and aircraft) and building and construction materials of large transportation means that require strict regulations on fire characteristics in order to secure, and furthermore, mobile phone housings and TV housings. , It relates to a thermoplastic resin composition suitable for manufacturing electric and electronic parts such as computer monitor housings and automobile parts such as automobile panels, button parts, and built-in lighting housings, and molded products including the same.

Description

Low-smoke thermoplastic resin composition for transportation with excellent impact resistance, flame retardancy, chemical resistance and heat release property and molded product containing the same article comprising the same}

The present invention relates to a low fugitive thermoplastic resin composition for transport having excellent impact resistance, flame retardancy, chemical resistance, and heat release characteristics, and a molded product including the same, and more particularly, to polycarbonate resin, sulfonate flame retardant, polytetrafluoroethylene micro By including powder and inorganic hydroxide flame retardant in a specific amount, it has excellent impact resistance and flame retardancy (1.5mm/V-0, UL-94), shows a low heat emission rate in the event of a fire to prevent fire spread, and prevents fire spread during combustion. Improved low smoke characteristics that prevent the occurrence of smoke can prevent deterioration of the properties of thermoplastic resin compositions and molded products due to disinfectants and disinfectants used for quarantine against Covid-19, and to ensure the safety of many occupants or residents from fire. It can be easily applied to applications for interior/exterior materials (buses, trains, ships, and aircraft) and building and construction materials of large transportation means that require strict regulations on fire characteristics in order to secure, and furthermore, mobile phone housings and TV housings. , It relates to a thermoplastic resin composition suitable for manufacturing electric and electronic parts such as computer monitor housings and automobile parts such as automobile panels, button parts, and built-in lighting housings, and molded products including the same.

Recently, as a major development issue of plastic materials, their application to electric and electronic fields such as mobile devices, TVs, and laptops, and automotive fields such as center fascias, garnishes, and interior lamps are increasing. Light weight, increased freedom of product design, and various characteristics There is an increasing demand for application of polymeric plastic materials to meet the requirements for granting and cost reduction.

In addition, quarantine is being strengthened due to Covid-19, and chemical decomposition of thermoplastic resin molded products due to disinfectants and disinfectants used for quarantine may cause deterioration of existing characteristics, resulting in appearance defects such as cracking of molded products. Since fire characteristics may be deteriorated due to chemical decomposition of molded articles, the demand for improvement in chemical resistance is increasing. This is an issue that occurred after the spread of Covid-19, and it is expected that there will be a high possibility that chemical resistance will be required in various fields where flame retardant polycarbonate is applied.

Accordingly, in Laid-Open Patent Publication No. 10-2020-0045465, a flame retardant and a flame retardant synergist include non-halogen sulfonic acid ester in polycarbonate and a resin having improved flame retardancy by including various types of inorganic flame retardants (inorganic hydroxide, etc.) Although the composition is disclosed, it is only the development of halogen-free sulfonic acid ester itself with excellent flame retardancy, and the problem of improving chemical resistance to disinfectants and bactericides, etc., which are often used during enhanced quarantine due to Covid-19, is not even recognized.

In addition, for the safety of occupants or residents in the event of a fire, such as large-scale transportation, means of transportation (aircraft, ship, train, and bus) and building and construction materials, it is necessary to have excellent flame retardancy, low heat emission characteristics, and low smoke characteristics. In addition, it is required to develop materials suitable for transport materials and construction materials by minimizing the decrease in impact strength caused by implementing flame retardancy.

As a thermoplastic material, polycarbonate is useful in a wide variety of applications due to its good balance of properties such as formability, heat resistance and impact properties, but commercial products of pure polycarbonate are UL-94 standard 1.5mm V- It has a low flame retardant rating of 2, can expand the possibility of fire spread due to the high heat release rate in case of fire, and can generate smoke during combustion, which makes it difficult for occupants to evacuate due to toxic smoke. , large-scale transport, transportation means (aircraft, ships, trains and buses) and building and construction material applications are limited.

In addition, in order to improve the flame retardancy of the thermoplastic resin composition, when using a halogen-based flame retardant, it may be life threatening due to substances harmful to the human body generated during combustion.

The most common way to impart flame retardancy without using a halogen-based flame retardant is to use a phosphoric acid ester-based flame retardant, but when the phosphoric acid ester-based flame retardant is simply applied to a polycarbonate resin, the impact strength of the resin composition is seriously reduced. there is.

Accordingly, in Patent Publication No. 10-2018-0079200, as one of the methods for enhancing impact resistance, an impact modifier containing crosslinked rubber particles such as ABS and methyl methacrylate butadiene-styrene copolymer (MBS) is added to A method of reinforcing the reduced flame retardancy by additionally adding a flame retardant while improving impact resistance has been attempted. However, an excessive amount of flame retardant is required according to the increase in the content of the impact modifier, and as a result, there is a risk of deterioration in fire characteristics due to increased heat emission and increased smoke density.

Under the above background, it is required to develop a thermoplastic polycarbonate resin composition having excellent impact strength and chemical resistance as well as eco-friendly and excellent fire characteristics.

The present invention is to solve the above problems of the prior art, by including polycarbonate resin, sulfonate flame retardant, polytetrafluoroethylene micropowder and inorganic hydroxide flame retardant in specific amounts, having excellent impact strength and chemical resistance and At the same time, it is a technical task to provide a thermoplastic resin composition capable of realizing excellent flame retardancy, low heat release rate and low smoke density characteristics and a molded product including the same.

In order to achieve the above technical problem, according to one aspect of the present invention, based on 100% by weight of the total composition, (a) 96.5 to 99.5% by weight of a polycarbonate resin; (b) 0.15 to 1.4% by weight of a sulfonate flame retardant; (c) 0.15 to 1.4% by weight of polytetrafluoroethylene micropowder; and (d) 0.1 to 1.4% by weight of an inorganic hydroxide flame retardant.

According to another aspect of the present invention, a molded article comprising the thermoplastic resin composition of the present invention is provided.

The thermoplastic resin composition according to the present invention contains thermoplastic aromatic polycarbonate, a sulfonate flame retardant, polytetrafluoroethylene micropowder, and an inorganic hydroxide flame retardant in an appropriate ratio, thereby improving the chemical resistance, impact strength, and flame retardancy of the final polycarbonate resin molded article. It shows the effect of reducing the heat release rate and smoke density characteristics while maintaining it at an excellent level.

Therefore, the thermoplastic resin composition according to the present invention can be easily applied to industries requiring the polycarbonate resin, for example, those requiring strict regulations on fire characteristics in order to secure the safety of a number of occupants or residents from fire. It can be easily applied to applications for interior/exterior materials (buses, trains, ships, and aircraft) of large transportation means and materials for building and construction, such as mobile phone housings, TV housings, computer monitor housings, automobile bumpers, wheel housings, and panels. It can be usefully applied to the manufacture of electric and electronic parts such as button parts, interior and exterior lighting housings, or parts for automobiles.

In addition, recently, due to Covid-19, quarantine in the affected area is actively progressing. Since the thermoplastic resin composition according to the present invention has excellent chemical resistance, it has excellent chemical resistance properties in all fields where disinfectants or disinfectants are used. The thermoplastic resin composition of the present invention can be applied.

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

The thermoplastic resin composition of the present invention, based on 100% by weight of the total composition, (a) 96.5 to 99.5% by weight of a polycarbonate resin; (b) 0.15 to 1.4% by weight of a sulfonate flame retardant; (c) 0.15 to 1.4% by weight of polytetrafluoroethylene micropowder; and (d) 0.1 to 1.4% by weight of an inorganic hydroxide flame retardant.

1. Thermoplastic resin composition

(a) polycarbonate

The thermoplastic aromatic polycarbonate resin used in the composition of the present invention can be prepared from a dihydric phenol, a carbonate precursor and a molecular weight modifier. The dihydric phenols are, for example, monomers of a polycarbonate resin having a structure represented by the following formula (1).

[Formula 1]

In Formula 1, X is an alkylene group, a linear, branched or cyclic alkylene group having no functional group, or a linear, branched or cyclic alkylene group including a functional group such as sulfide, ether, sulfoxide, sulfone, ketone, naphthyl, or isobutylphenyl. represents a branched or cyclic alkylene group, preferably, X may be a straight, branched or C3-C6 cyclic alkylene group having 1 to 10 carbon atoms; R1 and R2 each independently represent a hydrogen atom, a halogen atom, or an alkyl group such as a straight, branched or cyclic alkyl group having 1 to 20 carbon atoms or 3 to 20 (preferably 3 to 6) carbon atoms; n and m are independently integers from 0 to 4.

Non-limiting examples of the dihydric phenols include bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)phenylmethane, bis(4-hydroxyphenyl)naphthylmethane, bis(4-hydroxy Phenyl) -(4-isobutylphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 1-ethyl-1,1-bis (4-hydroxyphenyl) propane, 1-phenyl-1, 1-bis(4-hydroxyphenyl)ethane, 1-naphthyl-1,1-bis(4-hydroxyphenyl)ethane, 1,2-bis(4-hydroxyphenyl)ethane, 1,10-bis (4-hydroxyphenyl) decane, 2-methyl-1,1-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), etc., One of them is bisphenol A.

As the carbonate precursor, as another monomer of the polycarbonate resin, it is preferable to use phosgene (carbonyl chloride). Non-limiting examples of carbonate precursors include carbonyl bromide, bis halo formate, diphenylcarbonate or dimethylcarbonate, and the like.

As the molecular weight modifier, a known material, that is, a monofunctional compound similar to a monomer used in preparing a thermoplastic aromatic polycarbonate resin may be used. By way of non-limiting example, phenol-based derivatives thereof (e.g., para-isopropylphenol, para-tert-butylphenol, para-cumylphenol, para-isooctylphenol, para-isononylphenol, etc.) can be used, and various other materials such as aliphatic alcohols can be used, and among them, para-tert-butylphenol (PTBP) is most preferred.

Examples of the aromatic polycarbonate resin prepared from such a divalent phenol, carbonate precursor, and molecular weight modifier include linear polycarbonate resin, branched polycarbonate resin, copolycarbonate resin, polyester carbonate resin, and the like. there is

In an exemplary embodiment of the present invention, as a thermoplastic aromatic polycarbonate resin, it is preferable to apply a viscosity average molecular weight (Mv) of 15,000 to 40,000 as measured in a methylene chloride solution at 25 ° C., and to apply that of 17,000 to 30,000 It is more preferable to When the viscosity average molecular weight is less than 15,000, mechanical properties such as impact strength and tensile strength may decrease, and when it exceeds 40,000, problems may occur in processing of the resin due to an increase in melt viscosity. In particular, it is more preferable that the viscosity average molecular weight is 19,000 or more in terms of excellent mechanical properties such as impact strength and tensile strength, and it is more preferable that the viscosity average molecular weight is 30,000 or less in terms of processability.

The content of the aromatic polycarbonate resin in the thermoplastic resin composition of the present invention may be 96.5% by weight or more, 97% by weight or more, 97.5% by weight or more, 98% by weight or more, or 98.4% by weight or more based on 100% by weight of the total composition. , 99.5 wt% or less, 99.4 wt% or less, 99.2 wt% or less, or 99.1 wt% or less, for example, 96.5 to 99.5 wt%, 97 to 99.4 wt%, or 98.4 to 99.1 wt%. If the content of the aromatic polycarbonate resin in the composition is less than the above value, it is difficult to implement impact resistance, and conversely, if it is more than the above value, there may be a problem in implementing excellent chemical resistance, heat release rate and smoke density reduction effect.

(b) sulfonate flame retardants

As the sulfonate-based flame retardant, one selected from the group consisting of alkali metal salts or alkaline earth metal salts of perfluoroalkane alkali metal sulfonates, perfluoroalkane ammonium sulfonates, or aromatic sulfonates, or combinations thereof may be used. Preferably, perfluoroalkane alkali metal sulfonate or perfluoroalkane ammonium sulfonate may be used, wherein the perfluoroalkane includes an alkyl group having 1 to 16 carbon atoms.

Perfluoroalkane alkali metal or ammonium sulfonates are, for example, sodium or potassium perfluorobutanesulfonate, sodium or potassium perfluoromethylbutanesulfonate, sodium or potassium perfluorooctanesulfonate, sodium or potassium purple Fluoroethanesulfonate, sodium or potassium perfluoropropanesulfonate, sodium or potassium perfluorohexanesulfonate, sodium or potassium perfluoroheptanesulfonate, tetraethylammonium perfluorobutanesulfonate and tetraethylammonium It may be one or more selected from perfluoromethylbutanesulfonate, but is not limited thereto.

Alkali metal salts or alkaline earth metal salts of aromatic sulfonates include, for example, potassium diphenyl sulfone-3-sulfonate, dipotassium diphenylsulfone-3,3'-disulfonate, dipotassium 4,2',4', It may be at least one selected from the group consisting of 5'-tetrachlorodiphenylsulfone-3,5-disulfonate and dipotassium diphenylsulfone-3,3'-disulfonate, but is not limited thereto. .

A commonly used sulfonate-based flame retardant is potassium diphenyl sulphoen sulphonate, which has a structure shown in Chemical Formula 2 below. When used in polycarbonate, it is known to show a V-0 result in the UL94 flame retardant test at a thickness of 3.2mm while maintaining the original transparent characteristics of polycarbonate, and to improve the property of preventing dripping of combustibles during combustion It is known that UL94 flame retardancy test result V-0 can be obtained at 1.6mm by adding polymethylphenylsiloxane or polytetrafluoroethylene. In addition, the flame retardant is a non-halogen flame retardant that does not use a halogen material such as Br or Cl, and can be suitably applied commercially to regulations on halogen flame retardants.

[Formula 2]

In the thermoplastic resin composition of the present invention, the content of the sulfonate flame retardant may be 0.15 wt% or more, 0.18 wt% or more, 0.2 wt% or more, or 0.25 wt% or more, 1.4 wt% or less, 1.2 wt% or more, based on 100 wt% of the total composition. It may be 0.15 wt% or less, 1 wt% or less, 0.8 wt% or less, or 0.5 wt% or less, for example, 0.15 to 1.4 wt%, 0.2 to 1 wt%, or 0.25 to 0.5 wt%. When the content of the sulfonate flame retardant in the composition is less than the above values, it is difficult to achieve a low heat release rate and low smoke density. can affect

(c) polytetrafluoroethylene micropowder

In the present invention, polytetrafluoroethylene micropowder is added to prevent dripping of combustibles and improve chemical resistance by replacing conventional crystalline resins, etc., and the shape of the powder is not particularly limited, but is in the form of spherical or non-spherical powder. may be preferably used, and polytetrafluoroethylene micropowder in the form of a non-spherical powder may be used from the viewpoint of further improving chemical resistance. Here, the non-spherical powder shape means a powder that does not have a specific shape other than a substantially spherical shape.

The polytetrafluoroethylene micropowder is a polymer or copolymer containing a tetrafluoroethylene structure. Specifically, the fluoroethylene structure is 30% by weight to 100% by weight, preferably 40% by weight to 100% by weight of the total monomer units constituting the fluoropolymer. Specifically, when the monomer constituting the tetrafluoroethylene polymer is 100% by weight of the entire unit, dispersibility may be impaired during blending or molding.

When using the spherical powder form, an average particle diameter of 0.01 to 11 μm may be used. At this time, the average particle diameter of the spherical polytetrafluoroethylene micropowder may be preferably 0.05 to 8 μm, more preferably 0.1 to 6 μm, and most preferably 0.1 to 2 μm. If the average particle diameter is less than 0.01 μm, the effect of improving chemical resistance may be insufficient, and if it exceeds 11 μm, pulverization is required prior to mixing, or dispersibility in polycarbonate is poor and physical properties of molded products may be adversely affected. can

In the present invention, the content of the polytetrafluoroethylene micropowder may be 0.15% by weight or more, 0.2% by weight or more, 0.25% by weight or more, or 0.3% by weight or more, based on 100% by weight of the total composition, 1.4% by weight or less, It may be 1.3 wt% or less, 1.2 wt% or less, 1.1 wt% or less, or 1 wt% or less, for example, 0.15 to 1.4 wt%, 0.2 to 1.2 wt%, or 0.3 to 1 wt%. When the polytetrafluoroethylene micropowder content is less than the above value, the effect of improving chemical resistance, heat release rate and smoke density is insignificant, and flame retardancy may be lowered and harmed by the dripping of combustible materials during combustion, and conversely, more than the above value In this case, physical properties such as impact strength may be deteriorated.

(d) inorganic hydroxide flame retardants

The thermoplastic resin composition of the present invention may include an inorganic hydroxide flame retardant, wherein the inorganic hydroxide flame retardant is selected from the group consisting of aluminum distearate, aluminum trioxide, magnesium hydroxide, huntite, magnesium hydrate, or a combination thereof can be used, preferably, aluminum hydroxide can be used. When aluminum hydroxide is applied to polycarbonate, transparency is maintained and discoloration is reduced.

In the present invention, the content of the inorganic hydroxide flame retardant may be 0.1% by weight or more, 0.15% by weight or more, 0.2% by weight or more, or 0.25% by weight or more, 1.4% by weight or less, 1.2% by weight or less, based on 100% by weight of the total composition, It may be 1 wt% or less, 0.8 wt% or less, or 0.5 wt% or less, for example, 0.1 to 1.4 wt%, 0.2 to 1 wt%, or 0.25 to 0.5 wt%. When the content of the inorganic hydroxide flame retardant is less than the above value, the effect of reducing the heat release rate and smoke density is insignificant, and on the contrary, when it exceeds 5% by weight when the content of the inorganic hydroxide flame retardant is greater than the above value, the thermal stability is lowered and the mechanical properties are significantly lowered, and the chemical resistance is also it gets worse

(e) other additives

The thermoplastic resin composition of the present invention, in addition to the components (a), (b), (c) and (d) described above, further comprises one or more other additives conventionally added to thermoplastic resin compositions for injection molding or extrusion molding. can do. The resin composition of the present invention may include, for example, one or more additives selected from the group consisting of inorganic particles, antioxidants, lubricants, ultraviolet absorbers, light stabilizers, impact modifiers, matting agents, flame retardants, or mixtures of two or more thereof. can be included with

Specifically, as the antioxidant, phenol-based, phosphite-based, thioester-based, or a mixture of two or more of them may be used.

Specifically, as the lubricant, polyethylene-based, ethylene-ester-based, ethylene glycol-glycerin ester-based, montan-based, ethylene glycol-glycerin montanic acid ester-based, or a mixture of two or more of them may be used.

Specifically, as the light stabilizer, a benzotriazole-based compound, a hydroxyphenyltriazine-based compound, a pyrimidine-based compound, a cyanoacrylate-based compound, or a mixture of two or more thereof may be used.

The content of the other additives is not particularly limited, and is an amount that can be used to add additional functions within a range that does not impair desired physical properties of the thermoplastic resin composition of the present invention.

According to one embodiment of the present invention, the content of other additives may be 0.05 to 3% by weight, preferably 0.07 to 1.5% by weight, based on 100% by weight of the total composition. When the content of the other additives is less than 0.1% by weight, the effect of improving various functions according to the use of the other additives may be insignificant, and when the content of the other additives exceeds 1% by weight, mechanical properties may be deteriorated.

2. Molded article and its manufacturing method

The thermoplastic resin composition according to one embodiment of the present invention may be prepared by a known method. For example, after mixing the components and additives of the present invention described above, they can be melt-extruded in an extruder and manufactured in the form of pellets.

According to another embodiment of the present invention, a molded article comprising the thermoplastic resin composition of one embodiment of the present invention, that is, a molded article manufactured by molding the thermoplastic resin composition is provided. The thermoplastic resin composition has not only excellent impact strength and chemical resistance properties, but also excellent flame retardancy, low heat release rate, and low smoke density characteristics, such as molded products in fields where important properties are required, such as large-scale transportation and transportation vehicle parts, automobiles It can be used for parts, mechanical parts, electrical and electronic parts, office equipment such as computers, miscellaneous goods, etc., and can be particularly preferably applied to interior products such as ship and railway vehicle chair covers, seats, shelves, panels, and lighting housings. there is. More preferably, the present invention having excellent but chemical resistance can be applied to all fields where disinfectants and detergents used for enhanced quarantine due to Covid-19 can be encountered.

Hereinafter, the present invention will be described in more detail through Examples and Comparative Examples. However, these examples are only for helping the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

[Example]

The components used in this Example and Comparative Example are specifically as follows.

(a) Samyang Corporation's TRIREX 3022PJ was used as the polycarbonate resin.

(b) A sulfonate flame retardant was used by mixing Arichem's KSS and 3M's FR-2025 in a 50:50 ratio.

(c) Polytetrafluoroethylene micro powder (Teflon) was A-3800 from Mitsubishi chemical.

(d) Aluminum FRS from SM World was used as the inorganic hydroxide flame retardant.

Examples 1 to 3 and Comparative Examples 1 to 12

With the ingredients and contents shown in Tables 1 and 2 below, the compound was mixed and uniformly dispersed in a Henschel mixer, and then in a twin-screw melt mixing extruder with L / D = 48 and Φ = 25mm Melting temperature 290 ℃, screw rotation at 300 rpm It was extruded under conditions of speed, first vent pressure of about -600 mmHg, and self-feeding speed of 30 kg/h. After cooling the extruded strand in water, it was cut with a rotary cutter to prepare pellets, and the prepared pellets were dried in hot air at 100 to 110 ° C. for 4 hours, and then injection molded at a temperature of 270 to 290 ° C. to prepare a specimen. .

Property evaluation

For each specimen prepared in the above Examples and Comparative Examples, the properties were measured by the following method, and the results are shown in Table 1 and Table 2, respectively.

(1) IZOD impact characteristics (23℃)

By preparing a 1/8” thick specimen. Impact strength was measured according to ASTM D256.

(2) Evaluation of flame retardancy

According to the UL-94 vertical test method, the flame retardance of the 1.5 mm thick specimen was measured.

(3) Evaluation of heat release rate

According to ISO 5660-1, the Maximum Average Rate of Heat Emission of the test results was measured for 20 minutes on a 100 x 100 x 3 mm size plaque under a 25 kW/m2 condition.

The calculation of the maximum average heat release rate is as follows, and the average heat release rate data collection is performed at intervals of 2 seconds, and the maximum value of the average heat release rate value below calculated within 20 minutes is shown.

(t: time, q: heat release rate)

(4) Smoke density evaluation

Smoke density (DS-4) was measured on a 75 x 75 x 2 mm size plaque under the condition of 25 kW/m2 according to ISO 5659-2.

The smoke density is a value obtained by measuring the amount of smoke generated during combustion of a sample using a change in light transmittance, and is measured according to the following formula.

Ds(4) = (V/A × L) log(100/T)

(V: volume of test chamber, A: exposed area of test specimen, L: length of light beam, T: relative transmittance (%) of light at 4 minutes)

(5) Chemical resistance evaluation (ESCR Test)

A band strip test (7 days) was performed using a tensile specimen based on ASTM D638. Chemical resistance evaluation is to measure the tensile strength in accordance with ASTM D638, more preferably, the chemical resistance was evaluated by the reduction rate of the tensile strength through the tensile strength before the disinfectant treatment and the tensile strength after the disinfectant treatment.

The disinfectant used in the chemical resistance evaluation is a “Doctor Solution (Hansung Biochem Co., Ltd.)” product, which is used for disinfection of subways in Seoul in Korea, and contains 2.25% by weight of (C12-C18) alkylbenzyldimethyl ammonium chloride, (C12-C18) alkyldi It contains 2.25% by weight of Matel ethylbenzyl ammonium chloride, and includes other emulsion stabilizers.

[Table 1]

[Table 2]

As can be seen from the results of Table 1, it was confirmed that the compositions of Examples according to the present invention exhibit effects of reducing heat release rate and smoke density characteristics while maintaining chemical resistance, impact strength, and flame retardancy at excellent levels.

However, as can be seen from Table 2, when using the ABS resin in Comparative Example 1, while having excellent chemical resistance, it can be confirmed that the heat release rate, smoke density, and flame retardancy, which are fire characteristics, are lowered.

In Comparative Examples 2 and 3, when the inorganic hydroxide flame retardant is not used, flame retardancy, heat release rate, and smoke density characteristics may be deteriorated.

In Comparative Example 4, when polytetrafluoroethylene micropowder is not used, flame retardancy and heat release rate may be affected. More specifically, when a small amount of the polytetrafluoroethylene micropowder was used in Comparative Examples 11 and 12, the effect of improving chemical resistance, flame retardancy, heat release rate, and smoke density characteristics was insignificant, whereas, when used excessively, impact resistance may be lowered.

In Comparative Examples 5 and 6, when a phosphorus-based flame retardant other than the sulfonate flame retardant is used, flame retardancy may decrease when used in a small amount, and impact resistance may decrease when used in an excessive amount.

In Comparative Examples 7 and 8, when a small amount of the inorganic hydroxide flame retardant is used, the improvement in heat release rate and smoke density characteristics is insignificant, whereas when used in an excessive amount, mechanical properties and chemical resistance may be deteriorated.

In Comparative Examples 9 and 10, when a small amount of the sulfonate flame retardant is used, heat release rate and smoke density may be affected, and when used in an excessive amount, impact resistance as well as heat release rate and smoke density may be reduced.

Claims (7)

Based on 100% by weight of the total composition,
(a) 96.5 to 99.5% by weight of a polycarbonate resin;
(b) 0.15 to 1.4% by weight of a sulfonate flame retardant;
(c) 0.15 to 1.4% by weight of polytetrafluoroethylene micropowder; and
(d) 0.1 to 1.4% by weight of an inorganic hydroxide flame retardant,
thermoplastic resin composition The thermoplastic resin composition according to claim 1, wherein (a) the polycarbonate resin is prepared using a dihydric phenolic compound having a structure represented by Formula 1 below, a carbonate precursor, and a molecular weight modifier:
[Formula 1]

In Formula 1,
X is an alkylene group, a straight, branched or cyclic alkylene group having no functional group; or a straight, branched or cyclic alkylene group containing at least one functional group selected from the group consisting of a sulfide group, an ether group, a sulfoxide group, a sulfone group, a ketone group, a naphthyl group or an isobutylphenyl group,
R ₁ and R ₂ each independently represent a hydrogen atom, a halogen atom, or an alkyl group;
n and m are each independently an integer of 0 to 4; The method of claim 1, (b) the sulfonate-based flame retardant is selected from the group consisting of perfluoroalkane alkali metal sulfonates, perfluoroalkane ammonium sulfonates, alkali metal salts or alkaline earth metal salts of aromatic sulfonates, or combinations thereof. That is, a thermoplastic resin composition. The thermoplastic resin composition according to claim 1, wherein (c) the polytetrafluoroethylene micropowder has an average particle diameter of 0.01 to 11 μm. The thermoplastic resin composition according to claim 1, wherein (d) the inorganic hydroxide flame retardant is selected from the group consisting of aluminum hydroxide, aluminum distearate, magnesium hydroxide, magnesium hydrate, or combinations thereof. The thermoplastic resin composition according to claim 1, further comprising other additives selected from the group consisting of inorganic particles, antioxidants, glidants, ultraviolet absorbers, light stabilizers, impact modifiers, matting agents, flame retardants, or combinations thereof. A molded article comprising the thermoplastic resin composition according to any one of claims 1 to 6.