Polycarbonate composition as well as preparation method and application thereof

Abstract

The invention discloses a polycarbonate composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. Specifically, the polycarbonate composition provided by the invention comprises the following components in parts by weight: 60-85 parts of polycarbonate; 1-5 parts of polytetrafluoroethylene; 0.5-5 parts of an antistatic agent; and 15-30 parts of conductive carbon black. The polycarbonate composition prepared by the invention can be used for preparing the carrier tape, the carrier tape prepared by the invention has lower surface resistance, the conductivity is obviously improved, the addition amount of conductive carbon black can be reduced, the stability of the carrier tape in the processing process is improved, and the carrier tape is not easy to generate broken holes.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a polycarbonate composition and a preparation method and application thereof. Background Art

[0002] When using electronic components, the container commonly used to transport and store electronic components is a carrier tape made of polymer, which can be three-layer or single-layer. The electronic components are carried in the "pocket" formed by the carrier tape to prevent contamination and external impact during transportation or handling of the electronic components.

[0003] Conductive resins used for carrier tapes are usually polycarbonate resins containing polycarbonate resin (PC) and conductive carbon black. In order to meet the surface resistance requirements of the carrier tape (10 3 ~10 5 Ω / sq), in the prior art, the amount of conductive carbon black added usually needs to reach 18wt% to 35wt%. Such a high content of carbon black makes the carrier tape very difficult to prepare and form, and the carrier tape is prone to puncture.

[0004] The prior art lacks a carrier tape formed of polycarbonate filled with conductive carbon black, which has low surface resistance, excellent conductive properties, is stable during processing, and is not prone to pore breakage. Summary of the invention

[0005] The object of the present invention is to overcome the above-mentioned technical problems and provide a polycarbonate composition, which has a lower surface resistance, can also significantly improve the conductivity of the PC carrier material filled with conductive carbon black, reduce the amount of conductive carbon black added, and improve the stability of the carrier processing process, and is not prone to pores.

[0006] Another object of the present invention is to provide a process for preparing the polycarbonate composition.

[0007] Another object of the present invention is to provide applications of the polycarbonate composition.

[0008] The present invention is achieved through the following technical solutions: A polycarbonate composition, comprising the following components by weight: 60-85 parts of polycarbonate resin; 1-5 parts of polytetrafluoroethylene; Antistatic agent 0.5-5 parts; Conductive carbon black 15-30 parts; The antistatic agent is selected from polyether antistatic agents; The oil absorption value of the conductive carbon black is 100 to 180 mL / 100 g, and the oil absorption value of the conductive carbon black is tested according to ASTM D2414-2019 standard; The particle size of the polytetrafluoroethylene is Dv50 10 - 15 μm; The polyether type antistatic agent is selected from at least one of polyether amide, polyether imide or polyether ester amide.

[0009] In the polycarbonate composition provided by the present invention, the polycarbonate resin is preferably bisphenol A type polycarbonate, and the melt index of the bisphenol A type polycarbonate is preferably 15 - 25 g / 10 min; the test conditions are 300 °C and 1.2 kg.

[0010] Preferably, the oil absorption value of the conductive carbon black is 110 - 170 mL / 100 g, and the oil absorption value of the conductive carbon black is tested according to the ASTM D 2414 - 2019 standard.

[0011] The oil absorption value of the conductive carbon black is further preferably 120 - 150 mL / 100 g, and the oil absorption value of the conductive carbon black is tested according to the ASTM D 2414 - 2019 standard.

[0012] Preferably, the mass percentage of the conductive carbon black in the polycarbonate composition is 10% - 30%.

[0013] If the oil absorption value of the conductive carbon black is too high, it is difficult for the conductive carbon black to be dispersed; if the oil absorption value is too low, the conductivity is poor, and a higher addition amount is required to meet the resistance requirements, resulting in a decrease in the mechanical properties of the material.

[0014] Preferably, the polytetrafluoroethylene is in powder form.

[0015] Preferably, the polytetrafluoroethylene is in powder form with a particle size of Dv50 12 - 14 μm.

[0016] If the particle size of the polytetrafluoroethylene is too large, it is easy to cause wire drawing during the formation of the carrier tape. If the particle size of the polytetrafluoroethylene is too small, it is easy to agglomerate during the extrusion process, making the composite material prone to defects. Stress concentration occurs at the defect sites, which are first damaged to form cracks, and then the strength of the carrier tape is reduced.

[0017] Preferably, the polyether type antistatic agent is obtained by reacting an amide compound, an imide compound and / or an ester compound with a compound containing an alkylene oxide unit.

[0018] The amide compound includes caprolactam, or the reaction product of 1,2 - aminododecanoic acid itself, or the reaction product of hexamethylenediamine and adipate, or the amide compound obtained by reacting 1,2 - aminododecanoic acid with hexamethylenediamine and / or adipate.

[0019] The ester compound is selected from at least one of butylene glycol oxalate, ethylene glycol oxalate or glyceryl trioleate.

[0020] When extruding the carrier tape, polytetrafluoroethylene, as an inert material, can promote the more concentrated distribution of conductive carbon black in the polar polycarbonate phase. A small amount of antistatic agent can play a role in promoting the construction of the conductive network. Polytetrafluoroethylene and the antistatic agent can synergistically improve the conductivity.

[0021] Due to the high content of conductive carbon black, the ductility of the conductive carbon black-filled polycarbonate carrier tape material is poor. When forming the carrier tape, especially when forming the "pocket" of the carrier tape, pore breakage is likely to occur. Polytetrafluoroethylene can reduce the stress during forming, and the polyether-type antistatic agent can improve the ductility of the material. The two can synergistically improve the stability of the conductive carbon black-filled polycarbonate when forming the carrier tape.

[0022] If the addition amounts of polytetrafluoroethylene and the polyether-type antistatic agent are too small, no significant effect can be achieved. If the addition amounts are too large, the mechanical properties of the material will decline, and the strength of the carrier tape will decrease.

[0023] Those skilled in the art can add an auxiliary agent in an amount of 0.5 - 10 parts by weight to the polycarbonate composition of the present invention according to actual needs.

[0024] Preferably, the auxiliary agent is selected from at least one of an antioxidant, a flame retardant, a filler, an ultraviolet light absorber, or a lubricant.

[0025] Preferably, the antioxidant is selected from at least one of a hindered phenol antioxidant, a phosphite antioxidant, a thioether antioxidant, a polyaromatic amine antioxidant, or a hindered amine antioxidant.

[0026] Preferably, the antioxidant is selected from the compounding of a hindered phenol antioxidant and a phosphite antioxidant.

[0027] More preferably, the mass ratio of the hindered phenol antioxidant to the phosphite antioxidant is (1 - 3):(1 - 3).

[0028] Preferably, the flame retardant is selected from at least one of a brominated polymer, a metal dialkyl phosphite, a metal hydroxide, or an aromatic phosphate.

[0029] Specifically, the brominated polymer is brominated polystyrene.

[0030] Specifically, the metal dialkyl phosphite is aluminum tris(diethyl phosphite).

[0031] Specifically, the metal hydroxide is magnesium hydroxide.

[0032] Specifically, the aromatic phosphate is selected from at least one of resorcinol bis(diphenyl phosphate) or bisphenol A bis(diphenyl phosphate).

[0033] Preferably, the filler is selected from at least one of silica, calcium carbonate, talc, wollastonite, glass beads, kaolin, single crystal fiber, carbon fiber, glass fiber or barium sulfate.

[0034] Preferably, the ultraviolet absorber is selected from at least one of hydroxybenzophenones, hydroxybenzotriazoles, hydroxybenzotriazines, cyanoacrylates or nano-scale inorganic materials.

[0035] Specifically, the nano-scale inorganic material is selected from at least one of titanium oxide, cerium oxide or zinc oxide.

[0036] Preferably, the lubricant is selected from at least one of pentaerythritol stearate, ethylene bisstearamide or lignite wax.

[0037] The present invention also provides a preparation process of the above polycarbonate composition, comprising the following steps: Weigh each component by weight, mix them evenly, place them in a twin-screw extruder for melt extrusion and granulation to obtain a polycarbonate resin composition.

[0038] Preferably, the temperature of the twin-screw extruder during melt extrusion is set at 240 - 270 °C.

[0039] The present invention also provides an application of the above polycarbonate composition for preparing a carrier tape.

[0040] The present invention has the following beneficial effects: Compared with the prior art, the polycarbonate composition provided by the present invention synergistically improves the electrical conductivity of the carbon black-filled polycarbonate composition by adding polytetrafluoroethylene and a polyether-type antistatic agent, and can also synergistically improve the stability during the forming of the carrier tape. Specific Embodiments

[0041] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made. These all belong to the protection scope of the present invention.

[0042] Sources of raw materials used in the present invention: Polycarbonate: L-1225L, melt index 20 g / 10 min, Teijin Chemicals.

[0043] C1: Conductive carbon black, 420B, oil absorption value 145 mL / 100 g, Orion Corporation.

[0044] C2: Conductive carbon black, PRINTEX® 90, oil absorption value 95 mL / 100 g, Orlen Carbon.

[0045] C3: Conductive carbon black, E250G, oil absorption value 190 mL / 100g, Yixuanshi.

[0046] F1: Polytetrafluoroethylene resin, F5A EX, particle size Dv 50 is 12.8 μm, Solvay.

[0047] F2: Polytetrafluoroethylene resin, XPP 511, particle size Dv 50 is 20 μm, Solvay.

[0048] F3: Polytetrafluoroethylene resin, F284, particle size Dv 50 is 9 μm, Solvay.

[0049] F4: Polytetrafluoroethylene resin, PTFE-2013AD, particle size Dv 50 is 14 μm, Dongguan Lixin.

[0050] A1: Polyether amide type antistatic agent, MH2030, Arkema.

[0051] A2: Polyether ester amide type antistatic agent, PELESTAT-6500, Toyota Tsusho.

[0052] A3: Polyether imide type antistatic agent, IPE U1, Croda.

[0053] A4: Quaternary ammonium salt type antistatic agent, antistatic agent TM, Shanghai Auxiliary Chemical Factory.

[0054] Antioxidant: A mixture of hindered phenolic antioxidant (commercially available) and phosphite antioxidant (commercially available) in a weight ratio of 1:1; Lubricant: Pentaerythritol stearate, grade Glycolube P, Lonza.

[0055] Test piece preparation conditions: The polycarbonate composition particles prepared by the present invention are dried at 120 °C for 4 hours, and are extruded into a carrier tape with a width of 12 mm, a thickness of 0.2 mm, and pockets with a length of 6 mm × width of 6 mm × depth of 3 mm every 12 mm under the conditions of a screw diameter of 3.5 cm, an extrusion temperature of 300 °C, and an inlet and outlet speed of 10 rpm / min by a carrier tape extrusion molding machine.

[0056] Each test method: (1) Surface resistance: The surface resistance (ohms / sq) of the carrier tape is measured using ASTM standard D257-2014, and a resistance of 1×10 3 to 9×10 5 ohms / sq is qualified.

[0057] (2) Carrier tape forming and perforation situation: Take 100 m of carrier tape, observe the perforation situation of the carrier tape pockets, and calculate the number of perforations (pieces).

[0058] (3) Tape strength: The tape strength (MPa) was tested according to GBT standard 1040-2006, and those greater than 40 MPa were qualified.

[0059] Table 1 Component weight parts and test results of polycarbonate compositions of Examples 1-N Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Polycarbonate 60 72.8 76.8 76.8 76.8 76.8 81.3 85 C1 30 17 17 17 17 17 17 15 F1 5 5 3 3 3 1 1 F4 3 A1 5 5 3 3 0.5 0.5 A2 3 A3 3 Antioxidant 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Lubricant 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Surface resistance <![CDATA[3×10 3 > <![CDATA[8×10 4 > <![CDATA[1×10 5 > <![CDATA[2×10 5 > <![CDATA[3×10 5 > <![CDATA[1×10 5 > <![CDATA[4×10 5 > <![CDATA[3×10 6 > Hole punching condition of carrier tape forming 0 0 0 0 0 0 0 0 Carrier tape strength 44 45 51 51 50 50 53 54 As can be seen from Examples 1-8, no perforation occurred during the tape forming process of the polycarbonate composition provided by the present invention.

[0060] Table 2 Component weight parts and test results of polycarbonate compositions of Examples 1-8 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Comparative example 6 Comparative example 7 Comparative example 8 Polycarbonate 76.8 76.8 76.8 76.8 76.8 76.8 76.8 76.8 C1 17 17 17 17 17 17 C2 17 C3 17 F1 / 6 / 3 3 3 F2 / / 3 F3 / / 3 A1 / / 6 3 3 3 3 A4 / / 3 Antioxidant 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Lubricant 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Surface resistance <![CDATA[4×10 6 > <![CDATA[3×10 6 > <![CDATA[1×10 6 > <![CDATA[7×10 5 > <![CDATA[8×10 5 > <![CDATA[2×10 6 > <![CDATA[3×10 11 > <![CDATA[2×10 3 > Hole punching condition of carrier tape forming 12 10 9 7 9 10 3 3 Carrier tape strength 47 32 30 37 39 30 42 33 As can be seen from Comparative Examples 1-3, whether polytetrafluoroethylene resin and antistatic agent were not added simultaneously; or only any one of them was not added, different degrees of perforation occurred during the tape forming process.

[0061] As can be seen from Comparative Examples 4-5, too large or too small particle size Dv 50 of polytetrafluoroethylene resin will cause tape perforation.

[0062] As can be seen from Comparative Example 6, the quaternary ammonium salt type antistatic agent will also affect the tape forming.

[0063] As can be seen from Comparative Examples 7-8, too low or too high oil absorption number of conductive carbon black will also affect the tape forming.

Claims

1. A polycarbonate composition, characterized in that The composition includes the following components by weight: Polycarbonate 60-85 parts; 1-5 parts of polytetrafluoroethylene; Antistatic agent 0.5-5 parts; Conductive carbon black 15-30 parts; The antistatic agent is selected from polyether antistatic agents; The oil absorption value of the conductive carbon black is 100 to 180 mL / 100 g, and the oil absorption value of the conductive carbon black is tested according to ASTM D 2414-2019 standard; The particle size of the polytetrafluoroethylene is Dv50 10 to 15 μm; The polyether antistatic agent is selected from at least one of polyether amide, polyether imide or polyether ester amide.

2. The polycarbonate composition according to claim 1, characterized in that: The oil absorption value of the conductive carbon black is 110 to 170 mL / 100 g, and more preferably 120 to 150 mL / 100 g. The oil absorption value of the conductive carbon black is tested according to ASTM D 2414-2019 standard.

3. The polycarbonate composition according to claim 1, characterized in that: The polytetrafluoroethylene is in powder form, and the particle size is Dv50 12-14 μm.

4. The polycarbonate composition according to claim 1, characterized in that: By weight, 0.5-10 parts of auxiliary agents are also included.

5. The polycarbonate composition according to claim 4, characterized in that: The auxiliary agent is selected from at least one of an antioxidant, a flame retardant, a filler, an ultraviolet light absorber or a lubricant.

6. The polycarbonate composition according to claim 5, characterized in that: The antioxidant is selected from at least one of hindered phenol antioxidants, phosphite antioxidants, thioether antioxidants, polyaromatic amine antioxidants or hindered amine antioxidants; preferably, the antioxidant is selected from a combination of hindered phenol antioxidants and phosphite antioxidants; further preferably, the mass ratio of the hindered phenol antioxidant to the phosphite antioxidant is (1-2): (1-3).

7. The polycarbonate composition according to claim 5, characterized in that: At least one of pentaerythritol stearate, ethylene bisstearamide or montan wax.

8. The method for preparing the polycarbonate composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: weighing each component by weight, mixing them uniformly, placing them in a twin-screw extruder for melting, extruding and granulating to obtain a polycarbonate composition.

9. Use of the polycarbonate composition according to any one of claims 1 to 7, characterized in that: Used to prepare carrier tape.