KR0120103B1 - The inflammable thermoplastic composition - Google Patents

Abstract

A mixed resin 100 wt.parts of polycarbonate resin 30-70 wt.parts and ABS copolymer 70-30 wt.parts is mixed with a) phosphate(I) 5-20 wt.parts being derived from resorcinol as a flame-retardant agent, b) phosphate oligomer(II) 10-30 wt.parts, c) phosphate(III) 3-10 wt.parts being derived from melamine, d) aromatic or aliphatic phosphate(IV) 3-10 wt.parts, and teflon resin 0.5-5 wt.parts as dripping-protective agent, extruded by a twin screw extruder, and dried to give a flame-retardant resin composition. In formulas, R1-4 are C1-4 alkyl or C6-12 aryl; n is integer 5-10; R' is C1-8 alkyl; R" is C1-8 aliphatic divalent radical or C6-12 aromatic divalent radical.

Description

Flame Retardant Thermoplastic Composition

The present invention relates to a flame retardant thermoplastic resin composition which is excellent in flame retardancy and can be usefully used as a housing or building material for electrical and electronic products without any deterioration of mechanical properties. More specifically, polycarbonate resin (hereinafter referred to as PC) and acryl A molded article is manufactured by a conventional molding method in which two kinds of phosphorus flame retardants and two kinds of phosphorus flame retardant synergists are mixed with a teflon resin, melt-kneaded and extruded and then dried in a main component resin composed of a ronitrile-butadiene-styrene copolymer. It relates to a flame retardant thermoplastic resin composition.

Conventionally, PC-ABS blend composition, which blends PC with excellent mechanical properties and ABS with excellent gloss, processability and chemical resistance, has been used for various purposes. In particular, the demand for flame retardancy increases when used as an electric and electronic material or a building material. Therefore, research on this is being actively conducted. For example, U. S. Patent No. 3,825, 393 discloses a method of improving flame retardancy by incorporating halogen compounds and antimony compounds in PC and ABS blend resins, but the halogen and antimony-containing flame retardant resin compositions contain a large amount of free halogen elements during combustion. It occurs as a harmful to the human body and the antimony metal compound has a problem in that the overall physical properties of the product molded into a flame retardant resin composition by the catalytic action to cut the ester bond of the PC.

In order to solve the problem of the halogen-based flame retardant, efforts are being actively made to replace the phosphorus-based compound capable of forming non-combustible tar upon combustion of the PC-ABS resin molded body. However, ordinary phosphorus compounds used as flame retardants have low thermal stability of the flame retardant itself, and the amount of the flame retardant itself is high to express a flame retardant effect. At this time, as the added phosphorus acts as a plasticizer for the final composition, the overall physical properties of the blend composition are deteriorated. However, there are still many problems in the actual production and commercialization of products due to rising costs.

Accordingly, an object of the present invention is to provide a flame retardant thermoplastic resin composition having excellent flame retardancy and no deterioration in physical properties.

In order to achieve the above object as well as another object easily expressed in the present invention, two kinds of phosphorus flame retardants and melamine of phosphate compounds and phosphate oligomers derived from resorcinol in a resin composition mainly composed of PC and ABS Phosphorous flame retardant effect synergist of the phosphate compound and aromatic or aliphatic phosphate compound derived from A flame retardant thermoplastic resin composition capable of producing a molded article was prepared.

The present invention is described in more detail as follows.

5 to 20 parts by weight of a phosphate compound derived from resorcinol represented by the following general formula (1) as a flame retardant based on 100 parts by weight of a resin composed of 30 to 70% by weight of PC and 70 to 30% by weight of ABS. 10-30 parts by weight of phosphate oligomer represented by formula (2) and 3-10 parts by weight of phosphate compound derived from melamine represented by formula (3) below, aromatic or aliphatic phosphate represented by formula (4) 3 to 10 parts by weight of the compound and a slight amount of Teflon resin was stirred and mixed in a mixer, kneaded and extruded with a twin screw extruder, and dried to prepare a flame retardant thermoplastic resin composition. The prepared resin composition may be molded by conventional methods such as injection molding, extrusion molding, blow molding, and the like, and may be effectively used in fields where flame retardancy is required.

(In formulas (1), (2), (3) and (4), R ₁ , R ₂ , R ₃ , and R ₄ are C ₁ to C ₄ alkyl groups or C ₆ to C ₁₂ aryl groups, n Is an integer of 5 to 10, R 'is an alkyl group of C ₁ to C ₈ and R ″ is an aliphatic divalent radical of C ₁ to C ₈ or an aromatic divalent radical of C ₆ to C _12. )

When the compounds of the general formulas (1) and (2) are used below the limited range of the present invention, sufficient flame retardant effect cannot be expected, and when used in excess of the limited range of the present invention, the overall physical properties of the composition, particularly the elongation at break and impact strength The deterioration of the product is severe and the value of the commodity falls. When the compounds of the general formulas (3) and (4) are used below the limited range of the present invention, the synergistic effect of flame retardancy is negligible, and when used in excess of the limited range of the present invention, plasticization Severe phenomena are difficult to use as commodities. In the above general formulas (1), (2), (3) and (4), R ₁ , R ₂ , R ₃ , and R _{4 each} represent an alkyl group of C ₁ to C ₄ or an aryl group of C ₆ to C ₁₂ . Although possible, in view of suppressing plasticization of the resin composition and taking into account the thermal stability of the flame retardant, an aryl group of C ₆ to C ₉ is more preferable. Although the usage-amount of Teflon resin is not specifically limited, It is preferable to add 0.5-5 weight part with respect to 100 weight part of main component resins.

On the other hand, in the composition of the present invention, in order to improve the releasability at the time of molding and to improve weather resistance, a release agent such as wax or silicone or an ultraviolet absorber may be used.

The following examples and comparative examples illustrate the invention in more detail, but do not limit the invention.

Example 1

10 parts by weight of a flame retardant (1) in which R ₁ is a methyl group and R ₂ is a methyl group in the general formula (1) based on 100 parts by weight of a resin in which 50% by weight of PC and 50% by weight of ABS are mixed, and in the general formula (2) 15 parts by weight of a flame retardant (2) where '' is a methyl group, R '' is an ethyl group and n is 5, and 7 parts by weight of a flame retardant synergist (1) wherein R ₃ is a phenyl group in the general formula (3), and general formula (4) 5 parts by weight of flame retardant synergist (2), wherein R ₄ is a phenyl group and 0.5 parts by weight of TEFLON 6J (manufactured by DuPont) as a Teflon resin in a Henschel mixer for 10 minutes and mixed at a temperature of 210 to 240 ° C through a twin screw extruder. After kneading and extruding, drying and injection molding to measure various properties, impact strength is ASTM D256, breaking elongation is ASTM D638, flame retardancy is measured and evaluated by UL-94 vertical combustion test method and the results are shown in Table 1. .

[Examples 2-3 and Comparative Examples 1-3]

Except having changed the amount of each component as shown in Table 1, it carried out similarly to Example 1, and it showed in Table 1 by evaluating various physical properties.

As can be seen from Table 1, it can be seen that a flame retardant thermoplastic resin composition having excellent impact strength, elongation at break and flame retardancy can be obtained only when each component constituting the present invention is combined within an appropriate range.

Claims (5)

Phosphorus-based flame retardant represented by the following general formulas (1) and (2) in the main component resin composed of 30 to 70% by weight of polycarbonate resin and 70 to 30% by weight of acrylonitrile-butadiene-styrene copolymer A flame-retardant thermoplastic resin composition comprising a known flame-retardant synergist and the addition of a known anti-driping agent and molded by a conventional molding method. (In formulas (1), (2), (3) and (4), R ₁ , R ₂ , R ₃ , and R ₄ are an alkyl group of C ₁ to C | ₄ or an aryl group of C ₆ to C ₁₂ , n is an integer from 5 ~ 10, R 'is an alkyl group of C ₁ to C _8, R "is C ₁ to an aromatic divalent radical of an aliphatic radical of C ₈ or C ₆ ~ C _12.) The flame retardant thermoplastic resin composition according to claim 1, wherein the amount of the flame retardant represented by the general formula (1) is 5 to 20 parts by weight based on 100 parts by weight of the main component resin. The flame retardant thermoplastic resin composition according to claim 1, wherein the amount of the flame retardant represented by the general formula (2) is 10 to 30 parts by weight based on 100 parts by weight of the main component resin. The flame retardant thermoplastic resin composition according to claim 1, wherein the amount of the flame retardant synergist represented by the general formula (3) is 3 to 10 parts by weight based on 100 parts by weight of the main component resin. The flame retardant thermoplastic resin composition according to claim 1, wherein the amount of the flame retardant synergist represented by the general formula (4) is 3 to 10 parts by weight based on 100 parts by weight of the main component resin.