KR20110101763A - Flame retardant resin composition having improved heat stability, and molded artice manufactured therefrom - Google Patents

Abstract

The present invention relates to a flame retardant resin composition. More specifically, the present invention relates to a flame retardant resin composition comprising a thermoplastic resin, a phosphate ester compound, and a silica aerogel.
The flame retardant resin composition according to the present invention includes silica airgel as a flame retardant in addition to the phosphorus-based flame retardant, thereby ensuring excellent flame retardancy without excessive addition of the phosphorus-based flame retardant. Not only is it rarely observed, it shows excellent thermal stability and mechanical properties. Accordingly, there is no need to use a halogen-based flame retardant and a flame retardant auxiliary agent of antimony trioxide to secure flame retardancy, there is also an environmentally friendly advantage, and thus can be usefully used in the industrial field of the flame retardant resin composition.

Description

Flame retardant resin composition excellent in thermal stability, and a molded article formed by the composition {FLAME RETARDANT RESIN COMPOSITION HAVING IMPROVED HEAT STABILITY, AND MOLDED ARTICE MANUFACTURED THEREFROM}

The present invention relates to a flame-retardant resin composition excellent in heat stability and mechanical properties, and a molded article formed by the composition.

In general, a method of imparting flame retardancy to a resin includes a method of adding a flame retardant and a flame retardant aid, and conventionally, halogen-based flame retardants and antimony flame retardant aids have been used. However, halogen-based flame retardants are known to be corrosive to molds, harmful to workers, and release environmental hormones during combustion. In addition, antimony-based flame retardant aids are classified as toxic substances harmful to the human body is limited in use.

Accordingly, studies are being actively conducted to improve flame retardancy by using phosphorus (P) flame retardants without using halogen flame retardants.

However, in order to secure flame retardancy of UL-94 standard test V-1 or higher, a large amount of phosphorus-based flame retardant must be added, and there is a problem that the mechanical properties of the resin, etc., are reduced as a whole due to the excessive addition of the flame retardant.

In order to solve this problem, a method of adding a high carbonized polymer such as a novolak resin as a flame retardant and a flame retardant aid has been proposed. The technique uses a principle that a carbonized film is formed by a high carbonized polymer when the resin is on fire. It is effective in slowing down the progression.

However, in order to obtain flame retardancy above the UL-94 standard of test V-1, the use of a large amount of phosphorus-based flame retardant is still required, and since the formation time of the carbonized film is relatively long, small flames are generated between the carbonized films, As the combustion time increases, there is a limit to satisfying the flame retardant grade of the UL-94 standard.

An object of the present invention is to provide a flame retardant resin composition excellent in thermal stability and mechanical properties.

Still another object of the present invention is to provide a molded article formed by the flame retardant resin composition.

In order to achieve the above object, the present invention provides a flame retardant resin composition comprising a thermoplastic resin, a phosphate ester compound, and a silica aerogel.

The flame retardant resin composition may include 100 parts by weight of a thermoplastic resin, 1 to 50 parts by weight of a phosphate ester compound, and 0.01 to 10 parts by weight of a silica airgel.

The thermoplastic resin may be at least one selected from the group consisting of styrene resin, polycarbonate resin, polyamide resin, and polybutylene terephthalate.

In addition, the flame retardant resin composition according to the present invention may further include a high charring polymer.

The high charring polymer is cresol novolac, phenol novolac, urethane resin, phenol-formaldehyde resin, polycarbonate resin, polyphenylene ether resin, polyimide resin, polysulfone resin, poly It may be at least one selected from the group consisting of ester sulfone resins, polyphenylene sulfide resins, and polyether ketone resins.

Moreover, this invention provides the molded article obtained by hardening | curing the said flame-retardant resin composition. As the molded article is formed by the flame retardant resin composition according to the present invention, the flame retardancy test grade of the UL-94 standard is V-1 or more, and the impact strength according to ASTM-D256 is 5 to 60 kgf · cm / cm, preferably Is 10 to 40 kgf · cm / cm.

Hereinafter, a flame retardant resin composition and a molded article formed therefrom according to a specific embodiment of the present invention will be described.

Unless otherwise stated, the term 'high charring polymer' throughout this specification includes benzene or heteroatom rings in the polymer's main chain, and per unit mass of polymer (g) upon pyrolysis. As a generic term for a polymer that generates at least 5% carbide, more specific examples will be described later.

The present inventors secured excellent flame retardancy without adding excessive phosphorus-based flame retardant when adding silica aerogel as a flame retardant in addition to the phosphorus-based flame retardant in order to improve the flame retardancy in the thermoplastic resin in the course of studying the flame retardant resin composition. In addition to the addition, the addition of inorganic silica airgel did not show a decrease in the mechanical properties of the resin, it was confirmed that the excellent thermal stability and mechanical properties, and completed the present invention based on this.

A flame retardant resin composition according to an embodiment of the present invention includes (a) a thermoplastic resin, (b) a phosphate ester compound, and (c) a silica aerogel.

In addition, the flame retardant resin composition according to another embodiment of the present invention may further include (d) a high charring polymer, if necessary.

Hereinafter, embodiments of each component of the resin composition will be described in detail.

(a) thermoplastic resin

The thermoplastic resin that may be included in the flame retardant resin composition may be selected without limitation as long as it is commonly used in the art.

For example, the thermoplastic resin that may be included in the flame retardant resin composition of the present invention may be at least one selected from the group consisting of styrene resin, polycarbonate resin, polyamide resin, and polybutylene terephthalate.

In particular, the styrene resin may be used in various fields because of excellent mechanical properties, electrical properties, and molding processability, and preferably, a styrene resin may be used as the thermoplastic resin.

Hereinafter, specific examples of the thermoplastic resin will be described.

a-1) Styrene series  Suzy

As the styrene resin, a rubber modified styrene resin, a rubber modified styrene-containing graft copolymer, or a mixture thereof can be used, and preferably a rubber modified styrene resin can be used.

a-1-1) Rubber Modification Styrene series  Suzy

Rubber modified styrene-based resin is a thermoplastic resin added to secure physical properties such as impact resistance of the resin composition according to the present invention, in particular excellent in processability and kneading degree with a high carbonized polymer component that can be further included in the composition of the present invention. It is advantageous in an excellent point.

The rubber-modified styrene resin is iii) a polymer in which a rubbery polymer is dispersed in a particle form on a matrix composed of a vinyl aromatic monomer.

First, as the vinyl-based aromatic monomer, 'styrene compound' or 'compound copolymerizable with styrene compound' may be used by copolymerizing with 'styrene compound'.

In this case, as the 'styrene-based compound', styrene, nuclear alkyl substituted styrene, alpha alkyl substituted styrene, or the like may be used. Preferably, styrene, paramethyl styrene, 2,4-dimethyl styrene, ethyl styrene, alpha methyl styrene, and One or more monomers selected from the group consisting of alphamethylparamethylstyrene can be used.

In addition, as the 'compound copolymerizable with the styrene-based compound' may be used methacrylic acid ester, unsaturated nitrile compound, maleic anhydride, and the like, preferably methyl methacrylate, ethyl methacrylate, acrylonitrile, methacryl At least one compound selected from the group consisting of nitrile and maleic anhydride can be used.

The ii) rubber polymers include polybutadiene rubber, polybutadiene-acrylate rubber polymers, polybutadiene-methacrylate rubber polymers, styrene-butadiene copolymers, styrene-butadiene-styrene copolymers, polyisoprene, butadiene- At least one selected from the group consisting of isoprene copolymer and natural rubber can be used, and preferably polybutadiene rubber or styrene-butadiene copolymer can be used, and more preferably polybutadiene rubber can be used. As the polybutadiene rubber, a low-cis polybutadiene rubber (LBR), a high-cis polybutadiene rubber (HBR), or a mixture thereof may be used.

It is preferable to use the ii) rubber-like polymer having a glass transition temperature (Tg) of -10 ° C or less in order to impart minimal impact resistance to the rubber-modified styrene resin.

In this case, i) 70 to 97 parts by weight (preferably 85 to 96 parts by weight) of the vinyl-based aromatic monomer, and ii) 3 to 30 parts by weight (preferably with respect to 100 parts by weight of the rubber-modified styrene resin). 4 to 15 parts by weight) may be included. That is, the rubbery polymer is preferably contained 3 parts by weight or more based on 100 parts by weight of the rubber-modified styrene resin in order to give a minimum impact resistance to the rubber-modified styrene resin, the thermal stability is lowered due to excessive addition, melt flowability In order to prevent problems such as degradation, generation of gel, coloring, and the like, it is preferably included at 30 parts by weight or less based on 100 parts by weight of the rubber-modified styrene resin.

The manufacturing method of the rubber-modified styrene-based resin is not particularly limited because it can use a conventional manufacturing method in the technical field to which the present invention belongs, preferably a bulk polymerization method, suspension polymerization method, emulsion polymerization method and the like, More preferably, a bulk polymerization method can be used. In the case of using the bulk polymerization method, rubber modified styrene resin can be prepared by dissolving ii) rubbery polymer in vinyl-based aromatic monomer and stirring to prepare monomer solution and adding polymerization initiator thereto. have.

a-1-2) Rubber modified styrene Graft  Copolymer

The rubber-modified styrene-containing graft copolymer is another example of a styrene-based resin among 'thermoplastic resins' added to secure physical properties such as impact resistance of the flame retardant resin composition according to the present invention.

The rubber-modified styrene-containing graft copolymer may be a polymer obtained by grafting 30 to 60 wt% of 'styrene compound' and 10 to 30 wt% of 'acrylic compound' to 10 to 60 wt% of 'rubber'.

In this case, the 'styrene-based compound' may be used styrene, nuclear alkyl substituted styrene, alpha alkyl substituted styrene, etc., preferably styrene, paramethyl styrene, 2,4-dimethyl styrene, ethyl styrene, alpha methyl styrene, And it may be at least one compound selected from the group consisting of alpha methyl paramethyl styrene.

In addition, the 'acryl-based compound' may be at least one compound selected from the group consisting of acrylonitrile, methyl methacrylate and butyl acrylate.

In addition, the 'rubber' may be at least one selected from the group consisting of polybutadiene rubber, styrene-butadiene copolymer, polyisoprene and butadiene-isoprene copolymer.

Preferably, the rubber-modified styrene-containing graft copolymer may be an acrylonitrile / butadiene / styrene resin (ABS resin) in which acrylonitrile and styrene are grafted to polybutadiene rubber.

Since the rubber-modified styrene-containing graft copolymer can be prepared by a conventional polymerization method, it is not particularly limited, but is preferably synthesized by bulk polymerization or emulsion polymerization.

a-2) Polycarbonate  Suzy

The polycarbonate resin is another example of the 'thermoplastic resin' included in the flame retardant resin composition of the present invention, and may be one prepared according to a conventional manufacturing method in the art.

According to one embodiment of the present invention, the polycarbonate resin is prepared by reacting a dihydric phenol compound and a phosgene in the presence of a molecular weight regulator and a catalyst, or a dihydric phenol compound and diphenyl It can be prepared using an ester interchange reaction of a carbonate precursor such as carbonate.

The polycarbonate resin is a linear polycarbonate resin including a bisphenol A-based polycarbonate resin; Branched polycarbonate resins prepared by reacting a polyfunctional aromatic compound such as trimellitic anhydride or trimellitic acid with a dihydric phenol compound and a carbonate precursor; It may have a form such as polyester carbonate copolymer resin prepared by reacting the difunctional carboxylic acid with dihydric phenol and carbonate precursor.

On the other hand, such a polycarbonate-based resin is self-flammable, when using it as part of the thermoplastic resin, it may exhibit sufficient flame retardancy even without the addition of a high carbonization polymer that can be further added according to the embodiments to be described later.

a-3) polyamide resin

The polyamide-based resin is another example of the 'thermoplastic resin' included in the flame retardant resin composition of the present invention, and may be one prepared according to a conventional manufacturing method in the art.

The polyamide (hereinafter referred to as 'PA') resin is a polymer having an amide bond (-NHCO-) in the main chain, for example, polycaprolactam (PA-6) and polytetramethyleneadipamide (PA- 46), polyhexamethyleneadipamide (PA-66), polyhexamethylenecyclohexylamide (PA-6C), polyhexamethylene sebacamide (PA-610), polyhexamethylenedodecamide (PA-612) , Polyundecaractam (PA-11), polydodecaractam (PA-12), polyhexamethyleneisophthalamide (PA-6I), polyhexamethylene terephthalamide (PA-6T), polynonmethylene terephthalamide Polyamide copolymers containing (PA-9T), polydodecamethylene terephthalamide (PA-12T), polymethazylyleneadipamide (PA-MXD6) and at least two different polyamide forming components thereof, And mixtures thereof.

Preferably, the polyamide-based resin may be a polyamide copolymer (PA66 / 6) consisting of PA-6, PA-66, PA-610, or PA-6 monomer units and PA-66 monomer units.

a-4) Polybutylene terephthalate  Suzy

The polybutylene terephthalate resin is another example of the 'thermoplastic resin' included in the flame retardant resin composition of the present invention, and may be one prepared according to a conventional manufacturing method in the art.

According to one embodiment of the present invention, the polybutylene terephthalate resin is a butane-1,4-diol and terephthalate, or a butane-1,4-diol and dimethyl terephthalate as a monomer, a direct esterification reaction or It may be a polymer polycondensed through an ester exchange reaction.

In addition, in the present invention, modified polybutylene terephthalate may be used to increase the impact strength of the resin. The modification method includes a chemical modification method of copolymerizing polytetramethylene glycol (PTMG), polyethylene glycol (PEG), polypropylene glycol (PPG), low molecular weight aliphatic polyester, or low molecular weight aliphatic polyamide during polymerization; An example is a physical denaturation method of blending an impact modifier.

(b) Phosphate Ester Compounds

In the resin composition according to the present invention, the phosphate ester compound is a flame retardant component added to ensure flame retardancy of the resin.

The phosphate ester compound may be selected from the conventional phosphorus flame retardants in the art to which the present invention pertains, but is not limited thereto. Preferably, trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, and triphenyl are used. It may be at least one compound selected from the group consisting of phosphate, tricresyl phosphate, trizayl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate and aromatic diphosphate having the structure of formula (I):

Formula 1

또는

이고, n 은 0 내지 5의 정수이다.However, in Formula 1, Ar ₁ to Ar ₄ are each independently a phenyl group or an aryl group substituted with 1 to 3 alkyl groups of 1 to 4 carbon atoms, R is

or

And n is an integer of 0-5.

The phosphate ester compound as described above is preferably included in an amount of 1 to 50 parts by weight based on 100 parts by weight of the thermoplastic resin. That is, the phosphate ester-based compound is preferably included 1 part by weight or more based on 100 parts by weight of the thermoplastic resin in order to exhibit a minimum flame retardancy improvement effect, 50 parts by weight or less in order to prevent a drop in the impact strength due to excessive addition It is preferable to be included as.

(c) silica airgel ( silica aerogel )

In the flame retardant resin composition according to the present invention, the silica airgel can ensure flame retardancy of the resin without adding an excessive amount of phosphorus-based flame retardant, and at the same time, it is added to secure excellent mechanical properties such as impact resistance by minimizing deterioration of physical properties of the base resin. can do.

The silica airgel suppresses the emission of flammable volatiles generated when the resin is combusted and serves as a blowing agent, thereby improving the flame retardancy of the resin.

The silica airgel is a material used in the fields of ultra-low dielectrics, catalysts, electrodes, soundproofing materials, etc., due to its high specific surface area and porosity, and is manufactured by a sol-gel method using a silicone polymer such as Chemical Formula 2, and a wetted gel. It is preferable to hydrophobize to lower the water absorption rate:

[Formula 2]

In Chemical Formula 2,

X ₁ and X ₂ are each independently a hydroxyl group, a halogen element, an alkoxy group, an ester group, or a carboxyl group which is C 1 to C 5,

R ₁ and R ₂ are each independently hydrogen, an alkyl group of C 1 -C 10, an arylene group of C 6 -C 20, an alkyl arylene group of C 6 -C 20, or an aryl alkylene of C 6 -C 20,

n is an integer from 3 to 10,000.

The silica airgel is preferably included in 0.01 to 10 parts by weight based on 100 parts by weight of the thermoplastic resin. That is, the silica airgel is preferably included 0.01 parts by weight or more with respect to 100 parts by weight of the thermoplastic resin in order to give a minimum flame retardancy improvement effect to the resin composition, and prevents the mechanical properties such as impact strength due to excessive addition It is preferably included in 10 parts by weight or less.

(d) highly carbonized polymers ( high charring polymer )

In the resin composition according to the present invention, the highly carbonized polymer is a component that can be further added as necessary to impart flame retardancy to the resin and to secure physical properties such as heat resistance and impact strength.

As described above, the 'high charring polymer' includes benzene or hetero atom rings in the main chain of the polymer, and generates at least 5% of carbide per unit mass (g) of polymer during thermal decomposition. It is a generic term for a polymer.

The highly carbonized polymer that can be used in the composition of the present invention is not limited thereto, but is preferably cresol novolac, phenol novolac, urethane resin, phenol-formaldehyde resin, polycarbonate resin, polyphenylene ether resin , Polyimide resin, polysulfone resin, polyester sulfone resin, polyphenylene sulfide resin, and polyether ketone resin may be one or more selected from the group consisting of, more preferably heat resistance and mechanical In view of excellent strength, polyphenylene ether or polycarbonate can be used.

In particular, when the (a) thermoplastic resin includes a polycarbonate resin, sufficient flame retardancy and mechanical properties are secured, and thus it is not necessary to additionally include other highly carbonized polymers such as polyphenylene ether.

On the other hand, the highly carbonized polymer may be included in 1 to 100 parts by weight based on 100 parts by weight of the thermoplastic resin. That is, the highly carbonized polymer is preferably included 1 part by weight or more based on 100 parts by weight of the thermoplastic resin to exhibit a minimum flame retardancy improvement effect, 100 parts by weight or less in order to prevent a drop in impact strength due to excessive addition It is preferable to be included as.

(e) other additives

The flame retardant resin composition according to the present invention may include additional additives as necessary. The additive may be used in the art to which the present invention belongs depending on the physical properties of the resin to be adjusted.

Although not limiting the type of the additive, suitably, anti-dripping agent, anti-oxidant, heat stabilizer, light stabilizer, lubricant and pigment. It may further include one or more additives selected from the group consisting of (Pigment).

Preferably, the anti-dropping agent may be added in a ratio of 0.01 to 5 parts by weight, 0.01 to 5 parts by weight of heat stabilizer, 0.1 to 5 parts by weight of lubricant, 0.01 to 5 parts by weight of antioxidant and the like based on 100 parts by weight of the thermoplastic resin. .

On the other hand, the present invention provides a molded article obtained by curing the flame-retardant resin composition according to another embodiment.

That is, the flame retardant resin composition according to the present invention can be applied to various fields such as exterior materials requiring impact resistance and flame retardancy, but is not limited thereto. Preferably, the housing of a home appliance such as a copy machine, a printer, a television, an audio, etc. It can be applied to fields such as automobile exterior materials.

The molded article is manufactured by curing the flame retardant resin composition of the present invention, and the flame retardancy test grade of UL-94 standard is V-1 or more (that is, V-0 or V-1), while having excellent flame retardancy, and at the same time, ASTM-D256 Impact strength by 5 to 60 kgf · cm / cm, preferably 10 to 40 kgf · cm / cm is excellent in mechanical properties.

The flame retardant resin composition according to the present invention includes silica airgel as a flame retardant in addition to the phosphorus-based flame retardant, so that excellent flame retardancy can be ensured without excessive addition of the phosphorus-based flame retardant. Not only is it not observed, there is an advantage of excellent thermal stability and mechanical properties. Accordingly, there is no need to use a halogen-based flame retardant and a flame retardant aid of antimony trichloride to secure flame retardancy, there is also an environmentally friendly advantage, it can be usefully used in the industrial field of the flame retardant resin composition.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments are described to facilitate understanding of the present invention. However, the following examples are intended to illustrate the present invention without limiting it thereto.

[ Manufacturing example ]

Rubber modification with thermosetting resin Styrene series  Preparation of Resin

After preparing a monomer solution consisting of 8 parts by weight of polybutadiene rubber (rubber-like polymer), 77 parts by weight of styrene (vinyl aromatic monomer) and 15 parts by weight of ethylbenzene (solvent), 1,1-bis was used as a polymerization initiator. 0.02 parts by weight of-(t-butylperoxy) -3,3,5-trimethyl cyclohexane was added. The mixed solution was introduced into a continuous polymerization apparatus in which four stirred reactors were connected in series and continuously graft copolymerized. At this time, the inlet temperature of the polymerization apparatus was 125 ℃, the factory temperature was 140 ℃. The final copolymerized mixed solution was sent to a devolatilization tank, and the unreacted monomer and solvent were removed at 230 ° C. and 20 torr, and then pelletized to obtain a rubber-modified styrene resin containing 8% by weight of rubber.

[ Example  And Comparative example ]

Example  One

As shown in Table 1 below,

(a) 100 parts by weight of a-1-1) rubber-modified styrene resin obtained in the above Preparation Example as a thermosetting resin;

(b) 15 parts by weight of a phosphate ester compound (aromatic polyphosphate, manufactured by DAIHACHI CHEM, trade name: PX-200);

(c) 0.1 parts by weight of silica airgel (manufacturer: EM-POWER, trade name: EMP-SAP);

(d) 30 parts by weight of highly carbonized polymer (polyphenylene ether resin, manufactured by MITSUBISHI ENGINEERING PALSTIC CO, trade name: PX100F); And

(e) 0.1 parts by weight of anti-drip agent (teflon) and 0.6 parts by weight of lubricant (0.3 parts by weight of zinc stearate and calcium stearate) as other additives

Was added and uniformly mixed with a Henschel mixer to prepare a flame retardant resin composition.

Example  2

As shown in Table 1 below, (a) with respect to 100 parts by weight of a-1-1) rubber-modified styrene-based resin prepared in the above Preparation Example with a thermosetting resin; (b) 15 parts by weight of a phosphate ester compound; (c) 0.2 parts by weight of silica airgel; (d) A flame-retardant resin composition was prepared in the same composition as in Example 1, except that 50 parts by weight of the highly carbonized polymer was added.

Example  3

As shown in Table 1 below, (a) with respect to 100 parts by weight of a-1-1) rubber-modified styrene-based resin prepared in the above Preparation Example with a thermosetting resin; (b) 15 parts by weight of a phosphate ester compound; (c) 1 part by weight of silica airgel; (d) A flame-retardant resin composition was prepared in the same composition as in Example 1, except that 70 parts by weight of the highly carbonized polymer was added.

Example  4

As shown in Table 1 below, (a) with respect to 100 parts by weight of a-1-1) rubber-modified styrene-based resin prepared in the above Preparation Example with a thermosetting resin; (b) 15 parts by weight of a phosphate ester compound; (c) 5 parts by weight of silica airgel; (d) A flame-retardant resin composition was prepared in the same composition as in Example 1, except that 70 parts by weight of the highly carbonized polymer was added.

Example  5

As shown in Table 1 below, (a) with respect to 100 parts by weight of a-1-1) rubber-modified styrene-based resin prepared in the above Preparation Example with a thermosetting resin; (b) 15 parts by weight of a phosphate ester compound; (c) 5 parts by weight of silica airgel; (d) A flame-retardant resin composition was prepared in the same composition as in Example 1, except that 30 parts by weight of the highly carbonized polymer was added.

Comparative example  One

As shown in Table 1 below, (a) 1 part by weight of silica airgel and (d) 50 parts by weight of highly carbonized polymer are added to 100 parts by weight of a-1-1) rubber-modified styrene resin as a thermosetting resin. And (b) a resin composition was prepared in the same composition as in Example 1 except that the phosphate ester compound was not added.

Comparative example  2

As shown in Table 1 below, (a) 15 parts by weight of (b) a phosphate ester compound and (d) 30 parts by weight of a high carbonized polymer with respect to 100 parts by weight of a-1-1) rubber-modified styrene resin as a thermosetting resin A resin composition was prepared in the same composition as in Example 1 except that parts were added and (c) silica airgel was not added.

Example  6

As shown in Table 1 below,

(a) 15 parts by weight of a-1-2) rubber-modified styrene-containing graft copolymer (ABS resin, LG Chem, trade name: DP270) as a thermosetting resin, and a-2) polycarbonate-based resin (manufacturer: LG DOW, trade name: PC 300-15) 85 parts by weight;

(b) 15 parts by weight of a phosphate ester compound (aromatic polyphosphate, manufactured by DAIHACHI CHEM, trade name: PX-200);

(c) 5 parts by weight of silica airgel (manufacturer: EM-POWER, trade name: EMP-SAP); And

(e) 0.1 parts by weight of anti-drip agent (teflon) as other additives, and 0.6 parts by weight of lubricant (0.3 parts by weight of zinc stearate and calcium stearate, respectively)

Was added and uniformly mixed with a Henschel mixer to prepare a flame retardant resin composition.

Example  7

As shown in Table 1, except that (a) 30 parts by weight of a-1-2) rubber-modified styrene-containing graft copolymer and a-2) 70 parts by weight of polycarbonate-based resin were added as the thermosetting resin, A flame retardant resin composition was prepared in the same composition as in Example 6.

Comparative example  3

As shown in Table 1, (c) a resin composition was prepared in the same composition as in Example 6, except that silica aerogel was not added.

Composition (unit: parts by weight) Example Comparative example One 2 3 4 5 6 7 One 2 3 (a)
Thermoplastic a-1-1) Rubber Modification
Styrenic resin 100 100 100 100 100 - - 100 100 - a-1-2) Rubber Modification
Styrene-containing
Graft copolymer - - - - - 15 30 - - 15 a-2) polycarbonate - - - - - 85 70 - - 85 (b) Phosphate Ester Compounds 15 15 15 15 15 15 15 - 15 15 (c) silica airgel 0.1 0.2 1.0 5.0 5.0 5.0 5.0 1.0 - - (d) Highly Carbonated Polymer 30 50 70 70 30 - - 50 30 - (e) other additives 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7

[ Experimental Example ]

The resin compositions prepared in Examples and Comparative Examples were extruded at 300 ° C. using a twin screw extruder, molded into pellets, and injected again to prepare specimens.

For each specimen, the impact strength and flame retardancy were measured by the following method, and the results are shown in Table 2 below.

1. Impact strength measurement

After the 1/8 inch thick specimens were prepared according to ASTM-D256, the impact strength was measured using an Izod impact strength meter (manufacturer: Tinius Olsen).

2. Flame retardant measurement

According to UL-94, it was measured according to ASTM-D3801 with a 1/16 inch thick specimen.

In this case, the flame retardancy test grade is divided into V-0, V-1, V-2 and HB, the closer to V-0 means that the flame retardancy is excellent.

Performance test Example Comparative example One 2 3 4 5 6 7 One 2 3 Impact strength (kgfcm / cm) 13.5 14.0 20.0 15.0 12.0 22.0 30.0 13.0 13.6 25.0 Flame retardant rating V-1 V-0 V-0 V-0 V-1 V-0 V-1 FALE FALE V-2

As can be seen from Table 1 and Table 2, Comparative Example 1 is poor in flame retardancy by not adding a phosphate ester compound, Comparative Example 2 is a phosphate ester compound and a high carbonized polymer, Comparative Example 3 Although the phosphate ester compound was added, the flame retardancy was inferior as the silica airgel was not added.

In comparison, the compositions comprising thermoplastic resins, phosphate ester compounds, and silica aerogels or the compositions of Examples 1 to 7 comprising highly carbonized polymers in addition to such compositions were found to be excellent in flame retardancy without impairing impact strength.

Claims (14)

A flame retardant resin composition comprising a thermoplastic resin, a phosphate ester compound and a silica aerogel. The flame retardant resin composition of claim 1, comprising 100 parts by weight of the thermoplastic resin, 1 to 50 parts by weight of the phosphate ester compound, and 0.01 to 10 parts by weight of the silica airgel. The flame retardant resin composition of claim 1, wherein the thermoplastic resin is at least one member selected from the group consisting of styrene resin, polycarbonate resin, polyamide resin, and polybutylene terephthalate. The flame retardant resin composition of claim 3, wherein the styrene resin is a rubber modified styrene resin, a rubber modified styrene-containing graft copolymer, or a mixture thereof. The polymer of claim 4, wherein the rubber-modified styrene resin is a polymer obtained by dispersing a rubbery polymer in the form of particles on a mattress made of a vinyl aromatic monomer.
The vinyl aromatic monomer is at least one monomer selected from the group consisting of styrene, paramethyl styrene, 2,4-dimethyl styrene, ethyl styrene, alpha methyl styrene, and alpha methyl paramethyl styrene,
The rubbery polymer is polybutadiene rubber, polybutadiene-acrylate rubbery polymer, polybutadiene-methacrylate rubbery polymer, styrene-butadiene copolymer, styrene-butadiene-styrene copolymer, polyisoprene, butadiene-isoprene copolymer And at least one flame retardant resin composition selected from the group consisting of natural rubber. The rubber-modified styrene-containing graft copolymer of claim 4 is a polymer obtained by grafting a styrene-based compound and an acryl-based compound to rubber.
The styrene-based compound is at least one compound selected from the group consisting of styrene, paramethyl styrene, 2,4-dimethyl styrene, ethyl styrene, alpha methyl styrene, and alpha methyl paramethyl styrene,
The acryl-based compound is at least one compound selected from the group consisting of acrylonitrile, methyl methacrylate and butyl acrylate,
The rubber is at least one flame retardant resin composition selected from the group consisting of polybutadiene rubber, styrene-butadiene copolymer, polyisoprene and butadiene-isoprene copolymer. The method of claim 1, wherein the phosphate ester compound is trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, trigyyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate And at least one compound selected from the group consisting of aromatic diphosphates having a structure of Formula 1 below:
Formula 1

However, in Formula 1, Ar ₁ to Ar ₄ are each independently a phenyl group or an aryl group substituted with 1 to 3 alkyl groups of 1 to 4 carbon atoms, R is

or

And n is an integer of 0-5. The flame retardant resin composition of claim 1, further comprising a high charring polymer. The flame retardant resin composition of claim 8, comprising 1 to 100 parts by weight of the high carbonized polymer with respect to 100 parts by weight of the thermoplastic resin. The method of claim 8, wherein the high charring polymer is a cresol novolac, phenol novolac, urethane resin, phenol-formaldehyde resin, polycarbonate resin, polyphenylene ether resin, polyimide resin, A flame retardant resin composition which is at least one member selected from the group consisting of polysulfone resins, polyester sulfone resins, polyphenylene sulfide resins, and polyether ketone resins. The method of claim 1, wherein the anti-dripping agent, antioxidant (Anti-Oxidant), heat stabilizer (Heat Stabilizer), light stabilizer (Light Stabilizer), lubricant (Pigment) in the group consisting of Flame retardant resin composition further comprising at least one additive selected. A molded article obtained by curing the flame retardant resin composition according to claim 1. The molded article according to claim 12, wherein the flame retardancy test grade of the UL-94 standard is V-1 or higher. The molded article according to claim 12, wherein the impact strength according to ASTM-D256 is 5 to 60 kgf · cm / cm.