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CN-116829646-B - Polycarbonate resin composition and molded article

CN116829646BCN 116829646 BCN116829646 BCN 116829646BCN-116829646-B

Abstract

The present invention provides a polycarbonate resin composition having good low-temperature impact resistance, durability and flame retardancy. The polycarbonate resin composition is characterized by comprising 0.5-7 parts by weight of (C) phosphazene compound (component C) and 0.1-0.5 parts by weight of (D) fluorine-containing anti-dripping agent (component D) relative to 100 parts by weight of resin component composed of 10-90 parts by weight of (A) polycarbonate-polydiorganosiloxane copolymer (component A) and 90-10 parts by weight of (B) polycarbonate resin (component B), wherein the ratio (Mv (component A)/Mv (component B)) of the viscosity average molecular weight of the component A and the component B is 1-1.5, and the component A satisfies the following (i) - (ii). (i) The polycarbonate-polydiorganosiloxane copolymer is composed of a polycarbonate block represented by the following general formula [1] and a polydiorganosiloxane block represented by the following general formula [3 ]. (ii) a viscosity average molecular weight of 23000-30000.

Inventors

  • ODA KOJI

Assignees

  • 帝人株式会社

Dates

Publication Date
20260512
Application Date
20211214
Priority Date
20210202

Claims (4)

  1. 1. A polycarbonate resin composition comprising, relative to 100 parts by weight of a resin component comprising 10 to 90 parts by weight of a component A which is a polycarbonate-polydiorganosiloxane copolymer (A) and 90 to 10 parts by weight of a component B which is a polycarbonate resin (B), 0.5 to 7 parts by weight of a component C which is a phosphazene compound (C) and 0.1 to 0.5 part by weight of a component D which is a fluorine-containing anti-dripping agent (D), wherein the component C is a cyclic phenoxyphosphazene, the ratio of the viscosity average molecular weight of the component A to the viscosity average molecular weight of the component B, that is, the Mv of the component A, is 1 to 1.5, and the component A satisfies the following conditions (i) to (ii), (I) Is a polycarbonate-polydiorganosiloxane copolymer comprising a polycarbonate block represented by the following general formula [1] and a polydiorganosiloxane block represented by the following general formula [3], (Ii) The viscosity average molecular weight is 23000-30000, In the general formula [1], R 1 and R 2 each independently represent a group selected from a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 14 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aralkoxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group and a carboxyl group, and when a plurality of groups are present, they may be the same or different, e and f are each an integer of 1 to 4, W is a single bond or at least one group selected from groups represented by the following general formula [2], R 11 、R 12 、R 13 、R 14 、R 15 、R 16 、R 17 and R 18 in the general formula [2] each independently represent a group selected from a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 14 carbon atoms and an aralkyl group having 7 to 20 carbon atoms, R 19 and R 20 each independently represent a group selected from a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aralkoxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group and a carboxyl group, and when plural numbers exist, they may be the same or different, g is an integer of 1 to 10, h is an integer of 4 to 7, In the general formula [3], R 3 、R 4 、R 5 、R 6 、R 7 and R 8 are each independently a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, R 9 and R 10 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, p is a natural number, q is 0 or a natural number, the average chain length p+q is a natural number of 30 to 60, and X is a divalent aliphatic group having 2 to 8 carbon atoms.
  2. 2. The polycarbonate resin composition according to claim 1, wherein component A is a polycarbonate-polydiorganosiloxane copolymer having a structure in which polydiorganosiloxane domains are dispersed in a matrix of a polycarbonate, wherein the average size of the polydiorganosiloxane domains is 5 to 15nm, the normalized dispersion is 25% or less, and the total light transmittance of the polycarbonate-polydiorganosiloxane copolymer is 88% or more.
  3. 3. The polycarbonate resin composition according to claim 1 or 2, wherein component C is a cyclic phenoxy phosphazene containing 98.5mol% or more of a phosphazene cyclic trimer.
  4. 4.A molded article comprising the polycarbonate resin composition according to any one of claims 1 to 3.

Description

Polycarbonate resin composition and molded article Technical Field The present invention relates to a polycarbonate resin composition and a molded article. More specifically, the present invention relates to a polycarbonate resin composition and a molded article each of which has improved low-temperature impact resistance, durability and flame retardancy by blending a phosphazene compound and a fluorine-containing anti-dripping agent into a resin component comprising a polycarbonate-polydiorganosiloxane copolymer and a polycarbonate resin each having a specific viscosity-average molecular weight ratio. Background Polycarbonate resins are used for many applications such as mechanical parts, automobile parts, electric and electronic parts, office equipment parts, and the like due to excellent properties such as mechanical strength, dimensional stability, and flame retardancy. For outdoor electrical/electronic storage boxes such as information communication boxes and covers for outdoor use such as solar power generation junction boxes, thin-wall flame retardancy, high impact resistance in low-temperature use environments in winter, and durability which is not easily deteriorated even when exposed to ultraviolet rays and wind and rain, typically, as demonstrated by UL746C f rating, have been required, and conventional polycarbonate resins have not obtained sufficient performance. As a method for improving the low-temperature impact resistance and durability, a method of using a polycarbonate-polydiorganosiloxane copolymer and blending polytetrafluoroethylene particles and an organometallic salt flame retardant into the polycarbonate-polydiorganosiloxane copolymer has been proposed (patent documents 1 and 2). However, these methods cannot be said to have sufficient thin-wall flame retardancy, and the flame retardancy after the water exposure test in the UL746C f rating certification is insufficient. Further, the polycarbonate-polydiorganosiloxane copolymer obtained by the polymerization method of the general example is opaque and opaque, and there is a problem in terms of colorability in the resin composition using the polycarbonate-polydiorganosiloxane copolymer (patent documents 3 and 4). On the other hand, as a method for imparting more excellent flame retardancy, use of a phosphazene compound as a phosphorus flame retardant has been proposed (patent documents 5 and 6). However, the phosphazene compound has a disadvantage of lowering impact resistance when added. Further, these documents do not describe that a polycarbonate-polydiorganosiloxane copolymer and a polycarbonate resin having a specific viscosity-average molecular weight ratio are selected as the polycarbonate resin, whereby high durability and low-temperature impact resistance can be obtained even when a phosphazene compound is added. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 8-81620 Patent document 2 International publication No. 2011/1551490 Patent document 3 Japanese patent No. 2662310 Patent document 4 Japanese patent laid-open No. 3-79626 Patent document 5 Japanese patent application laid-open No. 2013-1801 Patent document 6 Japanese patent application laid-open No. 2012-1580 Disclosure of Invention The purpose of the present invention is to provide a polycarbonate resin composition and a molded article that have excellent low-temperature impact resistance, durability and flame retardancy. The present inventors have made intensive studies to solve the above problems, and as a result, have found that a polycarbonate resin composition excellent in low-temperature impact resistance, durability and flame retardancy can be obtained by blending a phosphazene compound and a fluorine-containing anti-dripping agent into a resin component composed of a polycarbonate-polydiorganosiloxane copolymer and a polycarbonate resin having a specific viscosity-average molecular weight ratio. The above object is achieved by a polycarbonate resin composition comprising 100 parts by weight of a resin component comprising 10 to 90 parts by weight of a polycarbonate-polydiorganosiloxane copolymer (component A) and 90 to 10 parts by weight of a polycarbonate resin (component B), 0.5 to 7 parts by weight of a phosphazene compound (component C) and 0.1 to 0.5 part by weight of a fluorine-containing anti-dripping agent (component D), wherein the ratio of the viscosity average molecular weight of component A to that of component B (component A) (Mv (component A)/Mv (component B)) is 1 to 1.5, and the component A satisfies the following (i) to (ii). (I) The polycarbonate-polydiorganosiloxane copolymer is composed of a polycarbonate block represented by the following general formula [1] and a polydiorganosiloxane block represented by the following general formula [3 ]. (Ii) The viscosity average molecular weight is 23000-30000. [ (In the above general formula [1], R 1 and R 2 each independently represent a group selected from a hy