A flame-retardant polycarbonate resin composition for confined spaces and its applications

Abstract

The present invention provides a flame-retardant polycarbonate resin composition for use in confined spaces and its applications, relating to the technical field of polymer materials. The flame-retardant polycarbonate resin composition of the present invention comprises the following components in parts by mass: 20-80 parts of a silicon-containing copolycarbonate, 12-30 parts of a brominated polycarbonate, 8-40 parts of a polyarylate, 0.1-2 parts of a sulfonate flame retardant, 0.1-2 parts of a silicone flame retardant, 0.2-10 parts of a phosphorus-containing compound, 0.1-5 parts of a synergistic smoke suppressant, and 0.1-2 parts of an anti-dripping agent. It may also include 0.1-5 parts by weight of other additives selected from one or more of a lubricant, an antioxidant, an ultraviolet absorber, and a demolding agent. This composition has high mechanical strength, high flame retardancy, extremely low smoke density and smoke toxicity, an extremely low heat release value, and extremely high resistance to chemical solvent cracking, and is used in confined spaces where people are highly concentrated and the space is relatively small and enclosed.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to a flame-retardant polycarbonate resin composition for a confined space and its application. Background Art

[0002] Polycarbonate (PC) has good thermal stability, excellent mechanical properties, dimensional stability, fatigue resistance, weather resistance, and electrical properties. However, once it encounters a high-temperature or open-flame environment during processing, molding, transportation, use, etc., it will undergo thermal oxidative degradation or intense combustion, and release thick black and highly toxic smoke, which will damage the use performance and appearance of the material. US 4,681,922A discloses a thermoplastic polysiloxane-polyester (carbonate) block copolymer, its preparation method and uses, showing improved melt fluidity without compromising thermal stability. At the same time, US 4,794,141A discloses a thermoplastic molding composition based on a polysiloxane / polycarbonate block copolymer, containing a siloxane / polycarbonate block copolymer, an elastomeric polymer, and an alkylene terephthalate. However, since the materials prepared by both are applicable to non-confined spaces, their comprehensive properties need to be further improved.

[0003] When polycarbonate is applied to the aircraft cabin in a confined space (where people are highly concentrated and the space is relatively narrow and enclosed), the requirements for the material's performance are more stringent. This is not only reflected in that the material must have excellent flame retardancy, extremely low smoke density and toxicity, extremely low heat release value, and strong resistance to cracking by various chemical solvents. Therefore, there is an urgent need to develop a flame-retardant polycarbonate resin composition for a confined space with high mechanical strength, high flame retardancy, extremely low smoke density and toxicity, extremely low heat release value, and at the same time, extremely high resistance to cracking by chemical solvents. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a flame-retardant polycarbonate resin composition for a confined space and its application. This composition has high mechanical strength, high flame retardancy, extremely low smoke density and toxicity, extremely low heat release value, and also has extremely high resistance to cracking by chemical solvents. The flame-retardant polycarbonate resin composition obtained by the present invention is used in a confined space where people are highly concentrated and the space is relatively narrow and enclosed, such as an aircraft cabin.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A flame-retardant polycarbonate resin composition for a confined space, comprising the following components in parts by mass:

[0007] Silicone-containing copolycarbonate: 20 - 80 parts;

[0008] Brominated polycarbonate: 12 - 30 parts;

[0009] Polyarylate: 8 - 40 parts;

[0010] Sulfonate flame retardant: 0.1 - 2 parts;

[0011] Silicone flame retardant: 0.1 - 2 parts;

[0012] Phosphorus - containing compound: 0.2 - 10 parts;

[0013] Synergistic smoke suppressant: 0.1 - 5 parts;

[0014] Dripping - resistant agent: 0.1 - 2 parts.

[0015] Preferably, it contains the following components in parts by mass:

[0016] Silicone - containing copolycarbonate: 20 - 70 parts;

[0017] Brominated polycarbonate: 20 - 30 parts;

[0018] Polyarylate: 8 - 40 parts;

[0019] Sulfonate flame retardant: 0.1 - 2 parts;

[0020] Silicone flame retardant: 0.1 - 2 parts;

[0021] Phosphorus - containing compound: 2 - 10 parts;

[0022] Synergistic smoke suppressant: 0.1 - 5 parts;

[0023] Dripping - resistant agent: 0.1 - 2 parts.

[0024] Preferably, the silicon unit in the silicone - containing copolycarbonate is polydimethylsiloxane and / or its derivatives, and the content of silicon element in the silicone - containing copolycarbonate is 0.1 - 5%, preferably 0.5 - 4%.

[0025] More preferably, the silicone - containing copolycarbonate is FG1760 of Formosa Plastics - Idemitsu Petrochemical Co., Ltd.

[0026] Preferably, the brominated polycarbonate is a polycarbonate resin graft - modified or copolymer - modified with a bromine - containing organic compound, and the content of bromine element in the brominated polycarbonate does not exceed 80%.

[0027] More preferably, the brominated polycarbonate is FG - 7500 and / or FG - 8500 of Teijin Group, Japan.

[0028] Even more preferably, the brominated polycarbonate is FG - 8500 of Teijin Group, Japan.

[0029] Preferably, the polyarylate is a liquid crystal polymer.

[0030] Further preferably, the polyarylate is prepared by polycondensation of an aromatic dicarboxylic acid, an aromatic diol and an aromatic monomer containing a hydroxyl group and a carboxylic acid group.

[0031] Further preferably, the polyarylate is that of Nanjing Qingyan Advanced Polymer Materials Co., Ltd. LS.

[0032] Preferably, the sulfonate flame retardant is selected from one or more of potassium benzenesulfonylbenzenesulfonate and its derivatives, potassium perfluorobutanesulfonate and its derivatives, and sodium 2,4,5-trichlorobenzenesulfonate and its derivatives.

[0033] Further preferably, the sulfonate flame retardant is KSS of Arichem Company.

[0034] Preferably, the silicone flame retardant is selected from one or more of polysilaboranes and their derivatives, crosslinked polydimethylsiloxanes and their derivatives, methylphenylsiloxanes and their derivatives, polyorganosilsesquioxanes, cage-like silsesquioxanes and their derivatives, and octaphenylcyclotetrasiloxane.

[0035] Further preferably, the silicone flame retardant is FCA-107 of DOW Company.

[0036] Preferably, the phosphorus-containing compound is selected from one or more of resorcinol bis[bis(2,6-dimethylphenyl)phosphate], bisphenol A bis(diphenyl phosphate), phosphazene compounds, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and its derivatives, 1,3-phenylene phosphoric acid (2,6-tolyl) tetraester, tetraphenylbisphenol A diphosphate and its derivatives, tetraphenylresorcinol diphosphate and its derivatives, triphenyl phosphate flame retardant, methylphenyl-bis(2,6-dimethylphenyl)phosphate, di-(2,6-dimethylphenyl)resorcinol diphosphate, hydroquinone bis(diphenyl phosphate), tetra-(2,6-dimethylphenyl)hydroquinone diphosphate, p-phenylenebis(tetraphenyl diphosphate), and diphenylenesulfone tetraphenyl diphosphate.

[0037] Preferably, the synergistic smoke suppressant is selected from one or several of nano-silica, nano-titanium dioxide, nano-aluminum oxide, and nano-montmorillonite.

[0038] Preferably, the anti-dripping agent is selected from one or several of polytetrafluoroethylene powder, AS-coated modified polytetrafluoroethylene powder, PMMA-coated modified polytetrafluoroethylene powder, polyvinylidene fluoride powder, polyhexafluoroethylene powder, and poly(tetrafluoroethylene-hexafluoroethylene) powder.

[0039] Preferably, the polycarbonate resin composition further comprises 0.1-5 parts by weight of other additives selected from one or more of lubricants, antioxidants, ultraviolet absorbers, and mold release agents.

[0040] The present invention also relates to an application of the above polycarbonate resin composition in a confined space.

[0041] Compared with the prior art, the present invention has the following beneficial effects: The polycarbonate resin composition of the present invention has high mechanical strength, high flame retardancy, extremely low smoke density and smoke toxicity, extremely low heat release value, and extremely high chemical solvent cracking resistance. Specific embodiments

[0042] The test methods in the following examples:

[0043] Tensile strength: Refer to ASTM D638.

[0044] Flexural strength and flexural modulus: Refer to ASTM D790.

[0045] Izod impact strength: Refer to ASTM D256.

[0046] Heat distortion temperature at 1.82 MPa (HDT): Refer to ASTM D149.

[0047] 60s vertical burning test (extinguishing time, char length, extinguishing time of dripping matter): Refer to the requirements of Part I of Appendix F of CCAR-25.

[0048] 4min smoke density: Refer to the requirements of Part V of Appendix F of CCAR-25.

[0049] NBS poison gas: Refer to HB / Z277-1995.

[0050] OSU heat release (total heat release for 2min, peak heat release rate): Refer to the requirements of Part IV of Appendix F of CCAR-25.

[0051] Chemical resistance under stress: The specimen shall not be softened, dissolved, cracked, whitened or broken in trichloroethane, methyl ethyl ketone, and toluene.

[0052] The components and parts by weight of Examples 1-4 and Comparative Examples 1-4 are shown in Table 1.

[0053] The preparation methods of the polycarbonate resin compositions in all examples and comparative examples are the same, specifically:

[0054] (1) Prepare materials according to the components and parts in Table 1;

[0055] (2) Put them into a high-speed mixer for pre-dispersion;

[0056] (3) It is put into a twin-screw extruder, and through plasticizing extrusion, cooling, and pelletizing, a flame-retardant polycarbonate resin composition is obtained.

[0057] Table 1 Formulations of Examples 1-4 and Comparative Examples 1-4

[0058]

[0059] Table 2 Performance Test Results of Examples 1-4 and Comparative Examples 1-4

[0060]

[0061]

[0062] The polycarbonate resin compositions of Examples 1-4 of the present invention have high mechanical strength, high flame retardancy, extremely low smoke density and smoke toxicity, extremely low heat release value, and extremely high chemical solvent cracking resistance, and the comprehensive indexes are superior to those of Comparative Examples 1-4.

[0063] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement of the technical solution of the present invention by those of ordinary skill in the art does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A flame retardant polycarbonate resin composition for confined space, characterized in that: Contains the following components by weight: Silicon-containing copolymer polycarbonate: 20-80 parts; Brominated polycarbonate: 12-30 parts; Polyarylate: 8-40 parts; Sulfonate flame retardant: 0.1-2 parts; Silicone flame retardant: 0.1-2 parts; Phosphorus-containing compounds: 0.2-10 parts; Synergistic smoke suppressant: 0.1-5 parts; Anti-dripping agent: 0.1-2 parts.

2. The polycarbonate resin composition according to claim 1, characterized in that The silicon unit in the silicon-containing copolymer polycarbonate is polydimethylsiloxane, wherein the content of silicon element in the silicon-containing copolymer polycarbonate is 0.1-5%.

3. The polycarbonate resin composition according to claim 1, characterized in that The brominated polycarbonate is a polycarbonate resin modified by grafting or copolymerization of a bromine-containing organic compound, wherein the content of bromine element in the brominated polycarbonate does not exceed 80%.

4. The polycarbonate resin composition according to claim 1, characterized in that The polyarylate is a liquid crystal polymer, which is prepared by polycondensation reaction of aromatic diacid, aromatic diol and aromatic monomer containing hydroxyl group and carboxylic acid group.

5. The polycarbonate resin composition according to claim 1, characterized in that The sulfonate flame retardant is selected from one or more of potassium benzenesulfonylbenzenesulfonate, potassium perfluorobutylsulfonate, and sodium 2,4,5-trichlorobenzenesulfonate.

6. The polycarbonate resin composition according to claim 1, characterized in that The organic silicon flame retardant is selected from one or more of polysilicon borane, cross-linked polydimethylsiloxane, methylphenylsiloxane, polyorganosilsesquioxane, cage silsesquioxane and octaphenylcyclotetrasiloxane.

7. The polycarbonate resin composition according to claim 1, characterized in that The phosphorus-containing compound is selected from one or more of resorcinol bis[di(2,6-dimethylphenyl) phosphate], bisphenol A bis(diphenyl phosphate), phosphazene compounds, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 1,3-phenylene phosphate (2,6-methylphenyl) tetraester, tetraphenyl bisphenol A diphosphate, tetraphenyl resorcinol diphosphate, triphenyl phosphate flame retardant, methylphenyl-bis(2,6-dimethylphenyl) phosphate, di-(2,6-xylyl) resorcinol diphosphate, hydroquinone bis(diphenyl phosphate), tetra-(2,6-xylyl) hydroquinone diphosphate, p-biphenylene tetraphenyl bisphosphate and diphenylene sulfone tetraphenyl bisphosphate.

8. The polycarbonate resin composition according to claim 1, characterized in that: The synergistic smoke suppressant is selected from one or more of nano silicon dioxide, nano titanium dioxide, nano aluminum oxide and nano montmorillonite.

9. The polycarbonate resin composition according to claim 1, characterized in that The anti-dripping agent is selected from one or more of polytetrafluoroethylene powder, AS-coated modified polytetrafluoroethylene powder, PMMA-coated modified polytetrafluoroethylene powder, polyvinylidene fluoride powder, polyhexafluoroethylene powder and poly(tetrafluoroethylene-hexafluoroethylene) powder.

10. The polycarbonate resin composition according to claim 1, characterized in that The polycarbonate resin composition further comprises 0.1-5 parts by weight of other additives, wherein the other additives are selected from one or more of lubricants, antioxidants, ultraviolet absorbers, and release agents.

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