A polycarbonate composition and use thereof

Abstract

The application discloses a polycarbonate composition and application thereof, and belongs to the technical field of high polymer materials. The polycarbonate composition comprises the following components in parts by weight: 89-96 parts of a polycarbonate resin, 0.6-12 parts of a welding reinforcing agent, wherein the welding reinforcing agent comprises welding reinforcing agent A and welding reinforcing agent B, the welding reinforcing agent A is a polymer with a butadiene segment, the mass percentage content of the butadiene segment is 28-72%, the welding reinforcing agent B is a siloxane compound with a phenyl group, and the mass ratio of the welding reinforcing agent A to the welding reinforcing agent B is (2-5):1. The polycarbonate composition has high ultrasonic welding strength and good drop ball impact performance under the joint action of the components in specific contents, and is suitable for preparing products such as power adapter housings and automobile lamps.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a polycarbonate composition and its application. Background Technology

[0002] Polycarbonate possesses excellent properties such as high strength, high toughness, high heat resistance, good dimensional stability, and electrical insulation, which makes it widely used in products such as power adapter housings and automotive lights.

[0003] Currently, ultrasonic welding is increasingly being used in the assembly of products such as power adapter housings and automotive lights. Ultrasonic welding utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the surfaces rub against each other, causing fusion between molecular layers. Ultrasonic welding offers advantages such as convenience, speed, no need for flux, and low cost.

[0004] However, due to the high glass transition temperature, high melt viscosity, and poor stability of polycarbonate itself, ultrasonic welding is prone to problems such as low weld strength and poor ball impact resistance, which makes it impossible to meet the product application requirements. Summary of the Invention

[0005] In view of the deficiencies of the existing technology, the purpose of this invention is to provide a polycarbonate composition and its application, which aims to significantly improve the welding strength and ball impact performance of polycarbonate ultrasonic welding.

[0006] To achieve the above objectives, the present invention provides a polycarbonate composition comprising the following components in parts by weight:

[0007] 89-96 parts of polycarbonate resin,

[0008] 0.6–12 parts of welding enhancer,

[0009] The welding enhancer includes welding enhancer A and welding enhancer B, and the mass ratio of welding enhancer A to welding enhancer B is (2-5):1;

[0010] Wherein, the welding reinforcing agent A is a polymer containing butadiene segments, and the mass percentage of butadiene segments in the welding reinforcing agent A is 28% to 72%;

[0011] The welding enhancer B is a siloxane compound containing phenyl groups.

[0012] Through repeated research, the inventors discovered that adding the aforementioned specific welding enhancer to polycarbonate resin significantly improves its ultrasonic welding effect, effectively enhancing the welding strength and drop ball impact resistance. This may be because, on the one hand, welding enhancer A contains elastic butadiene segments, which can immediately generate heat through viscoelastic hysteresis loss under ultrasonic action, promoting the heating of the welding interface and melting the polycarbonate resin; on the other hand, welding enhancer B contains phenyl and siloxane structures. The phenyl structure makes it compatible with the polycarbonate matrix, while the siloxane structure can improve the mobility of polycarbonate molecular chains at the welding interface, thereby promoting the interdiffusion of polycarbonate molecular chains at the interface, and thus improving the strength and drop ball impact resistance of ultrasonic welding.

[0013] The mass ratio of welding reinforcing agent A to welding reinforcing agent B needs to be controlled within the range of (2-5):1, such as 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, etc. When the mass ratio of welding reinforcing agent A to welding reinforcing agent B is <2:1, the molten resin at the welding interface will overflow rapidly, which is not conducive to the interdiffusion of polycarbonate molecular chains at the interface, resulting in low welding strength and poor drop ball impact performance. When the mass ratio of welding reinforcing agent A to welding reinforcing agent B is >5:1, the mobility of polycarbonate molecular chains at the welding interface is poor, which is also not conducive to the interdiffusion of polycarbonate molecular chains at the interface, thus leading to low welding strength and poor drop ball impact performance. Preferably, the mass ratio of welding reinforcing agent A to welding reinforcing agent B is (3-4):1, such as 3:1, 3.2:1, 3.5:1, 3.7:1, 4:1, etc., to improve welding strength and drop ball impact performance.

[0014] The mass percentage of butadiene segments in the welding reinforcing agent A needs to be controlled within the range of 28% to 72%, such as 28%, 30%, 40%, 50%, 60%, 70%, and 72%. When the mass percentage of butadiene segments in the welding reinforcing agent A is within the range of 28% to 72%, the effect of delayed energy loss is better, resulting in faster heating of the welding interface, faster melting of polycarbonate resin, and avoidance of defects such as pores caused by local overheating and resin degradation. This leads to better strength and falling ball impact performance of ultrasonic welding. In particular, when the mass percentage of butadiene segments in the welding reinforcing agent A is within the range of 40% to 60%, such as 40%, 45%, 50%, 55%, and 60%, the strength and falling ball impact performance of ultrasonic welding are further improved.

[0015] The mass percentage of butadiene segments in the welding enhancer A can be determined by a combination of elemental analysis and FTIR.

[0016] The polycarbonate resin is in the range of 89 to 96 parts by weight, such as 89 parts by weight, 90 parts by weight, 92 parts by weight, 94 parts by weight, 96 parts by weight, etc.

[0017] The welding enhancer is 0.6 to 12 parts by weight, such as 0.6 parts by weight, 1 part by weight, 3 parts by weight, 5 parts by weight, 7 parts by weight, 10 parts by weight, 12 parts by weight, etc.

[0018] Preferably, the welding reinforcing agent A includes at least one of ABS resin and MBS resin.

[0019] In one embodiment, the method for preparing the ABS includes the following steps:

[0020] Under an inert atmosphere, an emulsifier, an initiator, and a chain transfer agent are added sequentially to deionized water, followed by the addition of butadiene monomer and styrene monomer. The mixture is heated to react, and after the reaction is completed, it is cooled to obtain styrene-butadiene latex.

[0021] Deionized water, initiator, chain transfer agent, emulsifier, styrene monomer and acrylonitrile monomer are added to the above styrene-butadiene latex, heated to react, and then naturally cooled to react to obtain ABS grafted latex. After flocculation, filtration, washing and drying, ABS can be obtained.

[0022] Optionally, in the method for preparing ABS, when synthesizing styrene-butadiene latex, the amount of deionized water used is 180-220 parts by weight, the amount of emulsifier is 0.8-1.2 parts by weight, the amount of initiator is 0.2-0.4 parts by weight, the amount of chain transfer agent is 0.2-0.4 parts by weight, the amount of butadiene monomer is 92-98 parts by weight, and the amount of styrene monomer is 2-8 parts by weight.

[0023] Optionally, in the method for preparing ABS, the emulsifier used in the synthesis of styrene-butadiene latex includes at least one of potassium disproportionated rosinate, potassium oleate, and potassium stearate.

[0024] Optionally, in the method for preparing ABS, the initiator used in synthesizing styrene-butadiene latex includes at least one of potassium persulfate, cumene hydroperoxide, sodium persulfate, ammonium persulfate, and azobisisobutyl nitrile.

[0025] Optionally, in the method for preparing ABS, the chain transfer agent used in the synthesis of styrene-butadiene latex includes at least one of tert-dodecyl mercaptan, n-dodecyl mercaptan, tetradecyl mercaptan, tridecyl mercaptan, undecyl mercaptan, and decadecyl mercaptan.

[0026] Optionally, in the preparation method of ABS, when synthesizing styrene-butadiene latex, the heating reaction temperature is 68-72℃ and the heating reaction time is 28-32h.

[0027] Optionally, when synthesizing ABS from styrene-butadiene latex, the styrene-butadiene latex used is 32-74 parts by weight, deionized water is 8-12 parts by weight, initiator is 0.2-0.4 parts by weight, chain transfer agent is 0.4-0.6 parts by weight, emulsifier is 0.8-1.2 parts by weight, styrene monomer is 18-38 parts by weight, acrylonitrile monomer is 10-30 parts by weight, and the flocculant used for flocculation is 40-60 parts by weight of an 8-12 wt% magnesium sulfate aqueous solution.

[0028] Optionally, when synthesizing ABS from styrene-butadiene latex, the initiator used includes at least one of potassium persulfate, cumene hydroperoxide, sodium persulfate, ammonium persulfate, and azobisisobutyl nitrile.

[0029] Optionally, when synthesizing ABS from styrene-butadiene latex, the chain transfer agent used includes at least one of tert-dodecyl mercaptan, n-dodecyl mercaptan, tetradecyl mercaptan, tridecyl mercaptan, undecyl mercaptan, and decadecyl mercaptan.

[0030] Optionally, when synthesizing ABS from styrene-butadiene latex, the emulsifier used includes at least one of potassium disproportionated rosinate, potassium oleate, and potassium stearate.

[0031] Optionally, in the process of synthesizing ABS from styrene-butadiene latex, the heating reaction temperature is 78–82℃, the heating reaction time is 18–22h, and the natural cooling reaction time is 4–6h.

[0032] In one embodiment, the ABS is obtained commercially.

[0033] In one embodiment, the method for preparing the MBS includes the following steps:

[0034] Under an inert atmosphere, an emulsifier, an initiator, and a chain transfer agent are added sequentially to deionized water, followed by the addition of butadiene monomer and styrene monomer. The mixture is heated to react, and after the reaction is complete, a flocculant is added to remove excess emulsifier to obtain styrene-butadiene latex.

[0035] Graft polymerization was carried out by sequentially adding the styrene-butadiene latex, methyl methacrylate, and initiator to deionized water to obtain MBS resin.

[0036] Optionally, in the method for preparing MBS, when synthesizing styrene-butadiene latex, the amount of deionized water used is 180-220 parts by weight, the amount of emulsifier is 0.8-1.2 parts by weight, the amount of initiator is 0.2-0.4 parts by weight, the amount of chain transfer agent is 0.2-0.4 parts by weight, the amount of butadiene monomer is 60-70 parts by weight, and the amount of styrene monomer is 30-40 parts by weight.

[0037] Optionally, in the method for preparing MBS, the emulsifier used in the synthesis of styrene-butadiene latex includes at least one of potassium disproportionated rosinate, potassium oleate, and sodium dodecyl sulfate.

[0038] Optionally, in the method for preparing MBS, the initiator used in the synthesis of styrene-butadiene latex includes at least one of potassium persulfate, cumene hydroperoxide, sodium persulfate, ammonium persulfate, and azobisisobutyl nitrile.

[0039] Optionally, in the method for preparing MBS, the chain transfer agent used in the synthesis of styrene-butadiene latex includes at least one of tert-dodecyl mercaptan, n-dodecyl mercaptan, tetradecyl mercaptan, tridecyl mercaptan, undecyl mercaptan, and decadecyl mercaptan.

[0040] Optionally, in the method for preparing MBS, the heating reaction temperature during the synthesis of styrene-butadiene latex is 68–72°C, and the heating reaction time is 24–26 h.

[0041] Optionally, when synthesizing MBS from styrene-butadiene latex, the amount of deionized water used is 270-330 parts by weight, the amount of styrene-butadiene latex is 90-110 parts by weight, the amount of methyl methacrylate is 25-35 parts by weight, and the amount of initiator is 0.2-0.4 parts by weight.

[0042] Optionally, when synthesizing from styrene-butadiene latex, the initiator used includes at least one of potassium persulfate, cumene hydroperoxide, sodium persulfate, ammonium persulfate, and azobisisobutyl nitrile.

[0043] Optionally, in the process of synthesizing MBS from styrene-butadiene latex, the heating reaction temperature is 70-80℃ and the heating reaction time is 7-9h.

[0044] In one embodiment, the MBS is obtained commercially.

[0045] Preferably, the welding enhancer B comprises at least one of octaphenylsilsesquioxane, anilinepropyl cage silsesquioxane, and polyphenylmethylsiloxane.

[0046] Preferably, the polycarbonate resin has a melt flow rate of 2–21 g / 10 min at 300°C and a load of 1.2 kg, such as 2 g / 10 min, 3 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 21 g / 10 min, etc. The melt flow rate of the polycarbonate resin is measured according to ISO 1133-1:2011.

[0047] Preferably, the polycarbonate resin includes at least one of bisphenol A type polycarbonate or silicon copolymer bisphenol A type polycarbonate.

[0048] Preferably, it also includes the following components in parts by weight:

[0049] Flame retardant 0.05-0.5 parts,

[0050] 0.2-2 parts of anti-dripping agent.

[0051] Preferably, at least one of (1) to (2) is satisfied:

[0052] (1) The flame retardant includes sulfonate flame retardants;

[0053] (2) The anti-dripping agent includes polytetrafluoroethylene.

[0054] As an example, the sulfonate flame retardant includes at least one of potassium perfluorobutyl sulfonate and potassium 3-benzenesulfonylbenzenesulfonate.

[0055] Preferably, it also includes the following components in parts by weight:

[0056] Processing aids: 0.01-3 parts.

[0057] Preferably, the processing aid includes at least one of antioxidants and lubricants.

[0058] As an example, the antioxidant includes at least one of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0059] As an example, the lubricant includes at least one of pentaerythritol stearate, polyethylene wax, or silicone lubricant.

[0060] In some embodiments, the polycarbonate resin has a mass percentage content of 83% or more in the polycarbonate composition, such as 83%, 85%, 90%, 95%, 99.4%, etc.

[0061] In some embodiments, the method for preparing the polycarbonate resin composition includes the following steps:

[0062] All raw materials are mixed and dispersed to obtain a premix;

[0063] The premixed material is fed into the main feed port of a twin-screw extruder, melt-mixed and extruded into granules in the twin-screw extruder to obtain the polycarbonate resin composition.

[0064] Optionally, the screw length-to-diameter ratio is 35-65:1.

[0065] Optionally, the barrel temperature is 210-250℃.

[0066] Optionally, the screw speed is 200-800 rpm.

[0067] This application also provides the use of the polycarbonate composition in power adapter housings or automotive headlights.

[0068] Compared with the prior art, the beneficial effects of this application are as follows:

[0069] (1) This application adds a specific welding reinforcing agent to polycarbonate resin. On the one hand, the welding reinforcing agent A with elastic butadiene segments generates heat immediately through viscoelastic hysteresis loss under ultrasonic action, promoting the heating of the welding interface and melting the polycarbonate resin. On the other hand, the phenyl structure in the welding reinforcing agent B makes it compatible with the polycarbonate matrix, and the siloxane structure improves the mobility of polycarbonate molecular chains at the welding interface, promotes the mutual diffusion of polycarbonate molecular chains at the interface, and improves the strength of ultrasonic welding and the impact performance of falling balls.

[0070] (2) The polycarbonate composition of this application has good ultrasonic welding effect, high welding strength and good ball impact performance under the combined action of each component in a specific amount, and is suitable for manufacturing products such as power adapter shells and car lights. Detailed Implementation

[0071] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments and comparative examples. The purpose of this description is to provide a detailed understanding of the invention, not to limit its scope. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this invention are commonly used reagents and instruments.

[0072] Examples and Comparative Examples

[0073] Each embodiment and comparative example provides a polycarbonate composition, the composition of which is shown in Tables 1-2, and the preparation method includes the following steps:

[0074] All components are stirred and mixed in a high-speed mixer to obtain a premix;

[0075] The obtained premixed material is fed into the main feed port of a twin-screw extruder, melt-mixed and extruded into granules to obtain a polycarbonate resin composition. The screw length-to-diameter ratio is 45:1, the barrel temperature is 210-250℃, and the screw speed is 300 rpm. Unless otherwise specified, the preparation methods and process parameters used in the examples and comparative examples are the same.

[0076] The component information used in the above embodiments and comparative examples is as follows:

[0077] Polycarbonate resin 1: Bisphenol A type, melt flow rate 3g / 10min, PC 1300-03NP, LG Chem;

[0078] Polycarbonate resin 2: Bisphenol A type, melt flow rate 10g / 10min, PC 1300-10NP, LG Chem;

[0079] Polycarbonate resin 3: Bisphenol A type, melt flow rate 22 g / 10 min, PC 1300-22NP, LG Chem;

[0080] Polycarbonate resin 4: Silicon copolymer bisphenol A type, melt flow rate 12g / 10min, PC FG1760, Idemitsu, Taiwan, China;

[0081] Welding enhancer A1: ABS-30 resin, with a butadiene segment content of 30% by mass, self-made, and prepared by the following method:

[0082] Under nitrogen atmosphere, 200 parts by weight of deionized water, 1 part by weight of potassium disproportionated rosinate (emulsifier), 0.3 parts by weight of potassium persulfate (initiator), and 0.3 parts by weight of tert-dodecyl mercaptan (chain transfer agent) were added sequentially to a reactor. Then, 95 parts by weight of butadiene and 5 parts by weight of styrene monomer were added. After reacting at 70°C for 30 hours, the mixture was naturally cooled to obtain styrene-butadiene latex.

[0083] Take 32 parts by weight of the above styrene-butadiene latex and heat it to 80°C. Add 10 parts by weight of deionized water, 0.3 parts by weight of dicumyl peroxide (initiator), 0.5 parts by weight of tert-dodecyl mercaptan (chain transfer agent), 1 part by weight of potassium disproportionated rosinate (emulsifier), 38 parts by weight of styrene and 30 parts by weight of acrylonitrile monomer. Heat to 80°C and react for 2 hours. Then, cool naturally for 5 hours to obtain ABS grafted latex. Add 50 parts by weight of 10 wt% magnesium sulfate aqueous solution and let stand for 2 hours. Filter and wash with 300 parts by weight of deionized water and dry to obtain ABS with a butadiene segment content of 30 wt%.

[0084] Welding enhancer A2: ABS-40 resin, butadiene segment content is 40%, self-made, preparation method is as follows: basically the same as welding enhancer A1 (ABS-30), the difference is that in step (2) the styrene-butadiene latex is 42 parts by weight, and the styrene and acrylonitrile monomers are 33 parts by weight and 25 parts by weight, respectively.

[0085] Welding enhancer A3: ABS-50 resin, butadiene segment content is 50%, self-made, preparation method is as follows: basically the same as welding enhancer A1 (ABS-30), the difference is that in step (2) the styrene-butadiene latex is 53 parts by weight, and the styrene and acrylonitrile monomers are 28 parts by weight and 20 parts by weight, respectively.

[0086] Welding enhancer A4: ABS-60 resin, butadiene segment content is 60%, self-made, preparation method is as follows: basically the same as welding enhancer A1 (ABS-30), the difference is that in step (2) the styrene-butadiene latex is 63 parts by weight, and the styrene and acrylonitrile monomers are 23 parts by weight and 15 parts by weight, respectively.

[0087] Welding enhancer A5: ABS-70 resin, butadiene segment content is 70%, self-made, preparation method is as follows: basically the same as welding enhancer A1 (ABS-30), the difference is that in step (2) the styrene-butadiene latex is 74 parts by weight, and the styrene and acrylonitrile monomers are 18 parts by weight and 10 parts by weight, respectively.

[0088] Welding enhancer A6: MBS resin, with a butadiene segment content of 50% by mass, is prepared in-house using the following method:

[0089] Under nitrogen purging, 200 parts by weight of deionized water, 1 part by weight of potassium disproportionated rosinate (emulsifier), 0.3 parts by weight of potassium persulfate (initiator) and 0.3 parts by weight of tert-dodecyl mercaptan (chain transfer agent) were added sequentially to the reactor. Then, 65 parts by weight of butadiene and 35 parts by weight of styrene monomer were added. After reacting at 70°C for 25 hours, 0.2 parts by weight of magnesium sulfate were added to remove excess emulsifier and obtain styrene-butadiene latex.

[0090] 300 parts by weight of deionized water, 100 parts by weight of styrene-butadiene latex, 30 parts by weight of methyl methacrylate and 0.3 parts by weight of potassium persulfate (initiator) were added sequentially to the reactor and grafted at 70°C for 8 hours. After filtration and washing, MBS resin containing 50 wt% butadiene segments was obtained.

[0091] Welding enhancer A7: ABS-25 resin, butadiene segment content is 25%, self-made, preparation method is as follows: basically the same as welding enhancer A1 (ABS-30), the difference is that in step (2) the styrene-butadiene latex is 27 parts by weight, and the styrene and acrylonitrile monomers are 42 parts by weight and 33 parts by weight, respectively.

[0092] Welding enhancer A8: ABS-75 resin, butadiene segment content is 75%, self-made, preparation method is as follows: basically the same as welding enhancer A1 (ABS-30), the difference is that in step (2) the styrene-butadiene latex is 79 parts by weight, and the styrene and acrylonitrile monomers are 17 parts by weight and 8 parts by weight, respectively.

[0093] Welding enhancer B1: Polyphenylmethylsiloxane, CAS No. 63148-52-7, Sigma-Aldrich;

[0094] Welding enhancer B2: Octaphenylsilsesquioxane, CAS No. 5256-79-1, Sigma-Aldrich;

[0095] Welding enhancer B3: Anilinepropyl cage-like silsesquioxane, CAS No. 1708993-28-5, Forsmann Technology Co., Ltd.;

[0096] Welding enhancer B4: Polydimethylsiloxane (phenyl-free), CAS No. 9016-00-6, Sigma-Aldrich;

[0097] Flame retardant: Potassium perfluorobutyl sulfonate, commercially available;

[0098] Anti-dripping agent: Polytetrafluoroethylene, commercially available;

[0099] Processing aids: Antioxidant 1010, commercially available.

[0100] The melt flow rates of the above polycarbonate resins were measured according to ISO 1133-1:2011, under the following test conditions: 300℃, 1.2kg load.

[0101] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this application are the same.

[0102] The polycarbonate compositions obtained in each embodiment and comparative example were subjected to the following performance tests:

[0103] (1) Pull-out force test: After baking the sample at 120℃ for 48 hours, it was injection molded into a 100mm×10mm×2mm strip. Two strips were then welded using an ultrasonic welding device. The welding process was as follows: welding time 0.15s, welding pressure 2kg / cm². 2 The ultrasonic amplitude is 15 kHz. Two welded specimens are clamped at one end of the fixture of a universal tensile testing machine, and the maximum pull-out force when the specimen breaks is used to characterize the ultrasonic welding strength.

[0104] (2) Drop ball impact performance test: After baking the sample at 120℃ for 48 hours, the upper and lower cover parts with ultrasonic lines were formed on an injection molding machine at 290℃. The upper and lower cover parts were then welded into a box using ultrasonic welding equipment. The welding process was as follows: welding time 0.2S, welding pressure 2kg / cm². 2 The ultrasonic amplitude was 15 kHz. Following the GB-T14485-1993 standard, the welded components were tested at 23℃ and 50% relative humidity. A 500g steel ball was dropped from a height of 0.1m, and the appearance of the components after impact was observed. Three parallel components were used in the test. If no cracking or separation was observed in the top and bottom covers of the three components, the steel ball was raised by 0.1m, and three new components were used for the test until at least one component cracked or separated. The maximum height from which no cracking or separation occurred was recorded.

[0105] The test results are shown in Tables 1 and 2.

[0106] Table 1

[0107]

[0108]

[0109] Table 2

[0110]

[0111] As shown in Table 4, the pull-out force of the polycarbonate compositions obtained in each embodiment of this application is above 800N, and the maximum impact height of the falling ball is above 1.3m.

[0112] A comparison of Examples 3, 5-8 and Comparative Examples 1-2 shows that the ratio of the mass of welding reinforcing agent A to the mass of welding reinforcing agent B affects the pull-out force and the maximum height of the drop ball impact. In Comparative Examples 1 and 2, the pull-out force and the maximum height of the drop ball impact are too low or too high because the ratio is too low or too high. It is necessary to control the mass ratio within the range of 2-5 to obtain a higher pull-out force and the maximum height of the drop ball impact. In particular, when the mass ratio is within the range of 3-4, the pull-out force and the maximum height of the drop ball impact are further improved.

[0113] Comparative Example 3 had lower pull-out force and maximum drop ball impact height because the welding reinforcing agent B used did not contain phenyl.

[0114] A comparison of Examples 3, 9-13 and Comparative Examples 4-5 shows that the butadiene segment content in weld reinforcement A affects the pull-out force and the maximum drop ball impact height. In Comparative Examples 4-5, the pull-out force and the maximum drop ball impact height were lower due to the low or high butadiene segment content in weld reinforcement A. It is necessary to control the mass percentage content of butadiene segments in weld reinforcement A within the range of 28% to 72% to obtain higher pull-out force and maximum drop ball impact height. In particular, when the mass percentage content of butadiene segments in weld reinforcement A is within the range of 40% to 60%, the pull-out force and the maximum drop ball impact height are further improved.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polycarbonate composition characterized in that, The composition comprises the following components by weight: a polycarbonate resin 90~95 parts, a welding enhancer 0.6~12 parts, the welding enhancer comprises welding enhancer A and welding enhancer B, and the mass ratio of welding enhancer A to welding enhancer B is (3~4):1; wherein the welding enhancer A is a polymer having butadiene segments, and the mass percentage content of butadiene segments in the welding enhancer A is 40%~60%; the welding enhancer B is a siloxane compound having a phenyl group.

2. The polycarbonate composition of claim 1, wherein, The welding enhancer A comprises at least one of ABS resin and MBS resin.

3. The polycarbonate composition of claim 1, wherein, The welding enhancer B comprises at least one of octaphenyl silsesquioxane, aniline propyl cage silsesquioxane and polyphenyl methyl siloxane.

4. The polycarbonate composition of claim 1, wherein, The melt flow rate of the polycarbonate resin under the condition of 300℃ and 1.2kg load is 2~21g / 10min.

5. The polycarbonate composition of claim 1, wherein, The composition further comprises the following components by weight: a flame retardant 0.05~0.5 parts, an anti-dripping agent 0.2~2 parts.

6. The polycarbonate composition of claim 5, wherein, At least one of (1)~(2) is satisfied: (1) the flame retardant comprises a sulfonate flame retardant; (2) the anti-dripping agent comprises polytetrafluoroethylene.

7. The polycarbonate composition of claim 1, wherein, The composition further comprises the following components by weight: a processing aid 0.01~3 parts.

8. The polycarbonate composition of claim 7, wherein, The processing aid comprises at least one of an antioxidant and a lubricant.

9. Use of the polycarbonate composition according to any one of claims 1~8 in a power adapter housing or an automobile lamp.

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