Conductive polycarbonate composition and carrier tape prepared from same

Abstract

The invention belongs to the technical field of polymer conductive materials, and relates to a conductive polycarbonate composition and a carrier tape prepared therefrom, the conductive polycarbonate composition comprises polycarbonate with a solubility parameter of 9.5-10, a first polymer with a first solubility parameter, a second polymer with a second solubility parameter and conductive carbon black, the conductive polycarbonate composition is melted to form a melt with a sea-island structure, and the viscosity of the melt is 1800-5000 Pa.S. The invention further discloses a preparation method of the conductive polycarbonate composition. According to the conductive polycarbonate composition and the conductive carbon black, selective distribution is achieved in a melt, a long-fiber-shaped complete and coherent conductive network is formed, a mixed system is prepared into particles to serve as a raw material, the prepared finished product has excellent conductivity, the dispersity of the conductive carbon black in the mixed system is improved, and the conductivity of the conductive polycarbonate composition is improved. The number of salient points on the surface of a finished product is reduced, and the surface smoothness is excellent.

Description

Technical Field

[0001] The present application belongs to the technical field of polymer conductive materials and relates to a conductive polycarbonate composition and a carrier tape made thereof. Background Art

[0002] Polycarbonate has high impact strength, temperature resistance, good processability and dimensional stability, and is widely used in various fields such as the electrical and electronic industry, the building materials industry, and the automotive manufacturing industry. For example, it can be used as a raw material for carriers in electronic component packaging. When using polycarbonate as a raw material, conductivity issues are sometimes considered. Conductive polycarbonate is usually formed by extruding polycarbonate resin and conductive filler through an extruder to form granules. The conductive filler is generally conductive carbon black.

[0003] For example, a Chinese patent with publication number CN105694409A discloses a conductive polycarbonate and a preparation method thereof, wherein the conductive polycarbonate is composed of the following components in weight ratio: 80-100 parts of polycarbonate, 15-30 parts of conductive carbon black, 5-10 parts of toughening agent, and 0.5-1.5 parts of antioxidant. The preparation method of the conductive polycarbonate comprises the following steps: adding polycarbonate, conductive carbon black, toughening agent and antioxidant into a mixer according to the mass ratio, mixing at 90-110°C and a speed of 600-1000 revolutions per minute for 20-50 minutes, extruding the mixed material through an extruder at 220-230°C, cooling, drying, and pelletizing to obtain a blend product.

[0004] However, due to the low bulk density and large surface area of ​​conductive carbon black, it is not easy to disperse in polycarbonate to form agglomerates. When the above conductive polycarbonate is used as a raw material to prepare products such as carriers that have high requirements for surface flatness, large bumps will appear on the surface of the finished product after molding, which cannot meet the use requirements. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the conductive polycarbonate composition and to provide a conductive polycarbonate composition and a carrier tape made thereof. The carrier tape finished product made of the conductive polycarbonate composition not only has excellent conductive properties, but also reduces the number of bumps on the surface of the finished product and has excellent surface smoothness.

[0006] In a first aspect, the present application provides a conductive polycarbonate composition, comprising a polycarbonate having a solubility parameter of 9.5-10, a first polymer having a first solubility parameter, a second polymer having a second solubility parameter, and conductive carbon black, wherein the conductive polycarbonate composition is melted to form a melt having an island structure, and the viscosity of the melt is 1800~5000 Pa.S.

[0007] The conductive polycarbonate composition is melted to form a melt with an island structure. Under the action of the melt flow field, the first polymer and the second polymer are distributed in the polycarbonate (sea) in the form of long fibers (islands), and the conductive carbon black is selectively distributed in the phase or interface formed by the first and second polymers, thereby forming a complete and coherent conductive network in the form of long fibers. The selective distribution of the conductive carbon black in the phase or interface formed by the first and second polymers can also avoid its agglomeration to form large convex points, so that the conductive polycarbonate composition is used as a raw material for melt blending to form particles, and the finished product has excellent conductivity and surface smoothness. In addition, the melt viscosity of the conductive polycarbonate composition is controlled at 1800~5000Pa.S, so that the conductive polycarbonate composition has appropriate friction when forming a melt blend, so that the conductive carbon black can be dispersed without affecting the formation of the conductive network, and the conductivity and surface smoothness of the finished product are further guaranteed. Specifically, when the viscosity is less than 1800Pa.S, the friction during melt blending is too small to disperse the conductive carbon black, forming block agglomerates, reducing the conductivity and surface smoothness of the finished product. When the viscosity is greater than 5000Pa.S, the friction during melt blending is too large, causing the conductive carbon black to be too dispersed and unable to form a coherent conductive network, thereby reducing the conductivity of the finished product.

[0008] Preferably, the absolute value of the difference between the first solubility parameter and the polycarbonate solubility parameter is 0.5 to 2.0, and the absolute value of the difference between the second solubility parameter and the polycarbonate solubility parameter is 0.5 to 1.5. When the absolute value of the difference between the solubility parameters is within the above range, it is possible to ensure that the conductive polycarbonate composition forms a melt with an island structure after melting, while preventing the processability problem during melt blending due to poor compatibility between the substances in the conductive polycarbonate composition, thereby improving the mechanical properties of the finished product and ensuring the quality of the finished product.

[0009] Preferably, the polycarbonate comprises a first polycarbonate having a first melt index and a second polycarbonate having a second melt index.

[0010] Further preferably, the first melt index is 5-15 g / 10 min (300°C, 1.2 kg), and the second melt index is 15-30 g / 10 min (300°C, 1.2 kg). The viscosity of the conductive polycarbonate composition can be adjusted by controlling the content of the two polycarbonates, thereby adapting different conductive carbon blacks to achieve the best dispersion effect.

[0011] Preferably, the content of the polycarbonate is 70-85% by mass relative to the total mass of the conductive polycarbonate composition.

[0012] Preferably, the first polymer is a polyolefin elastomer and a graft-modified copolymer thereof. The polyolefin elastomer is a block copolymer of a hard segment and a soft segment, which can form more island structure distributions when the conductive polycarbonate composition forms a melt blend, thereby promoting the formation of a conductive network of conductive carbon black.

[0013] Preferably, the content of the first polymer is 1-5% by mass relative to the total mass of the conductive polycarbonate composition.

[0014] Preferably, in the first polymer, the hard segment may be polystyrene, nylon, polyester, polyisocyanate, etc., and the soft segment may be ethylene-butene copolymer, aliphatic polyester, polyether, polyols, etc.

[0015] Preferably, the polyolefin elastomer may be a SEBS block copolymer, a polyamide thermoplastic elastomer (TPAE), a thermoplastic polyester elastomer (TPEE), a thermoplastic polyurethane elastomer (TPU), or the like.

[0016] The grafting modification can be carried out by maleic anhydride grafting or by any polar third monomer grafting. More preferably, the grafting rate ranges from 0.5 to 3% to increase the compatibility between the phases of the melt blend, so as to form an island structure while avoiding the formation of vertical lines on the surface of the finished product, which affects the appearance of the finished product.

[0017] Preferably, the second polymer is a copolyester polymer. Copolyester polymers have good compatibility with conductive carbon black, which is conducive to uniform dispersion of conductive carbon black in the phase or on the interface of the copolyester polymer to form a conductive path.

[0018] Preferably, the content of the second polymer is 0.5-5% by mass relative to the total mass of the conductive polycarbonate composition, and the added amount of the copolyester polymer is below 5% by mass, which can minimize the ester exchange reaction caused by the large-scale use of the copolyester polymer and avoid the production of small molecule products in the process of forming the conductive polycarbonate composition into a finished product, forming pores and affecting the moldability of the finished product.

[0019] Preferably, the copolyester polymer is ethylene-methyl acrylate copolymer (EMA), ethylene-methacrylic acid copolymer (EMAA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyethylene terephthalate-1,4-cyclohexanedimethanol (PCTG), and the like.

[0020] Preferably, the oil absorption value of the conductive carbon black is in the range of 150-300 mL / 100 g. The higher the oil absorption value of the carbon black, the higher its chain dendrite structure, the easier it is to establish a conductive network in the system, and the better the conductivity of the finished product. However, if the oil absorption value is too high, the dispersibility of the conductive carbon black is worse, and it is easier to form agglomerations in the composition, resulting in a large number of convex spots on the surface of the finished product.

[0021] Preferably, the content of the conductive carbon black is 8-20% by mass relative to the total mass of the conductive polycarbonate composition.

[0022] The second aspect of the present application provides a carrier tape, wherein the raw material of the carrier tape is particles made of the above-mentioned conductive polycarbonate composition. The particles are melt-extruded to form a conductive sheet, which is then cut into long strips, and storage holes that match the size and shape of electronic components are formed at equal intervals to form a carrier tape; or the particles are melt-extruded to directly form multiple rows of parallel storage holes and then cut into a carrier tape.

[0023] The maximum protrusion height of the surface protrusions of the carrier tape is less than 0.5 mm, and the number of protrusions is less than 10 per 10,000 meters, and the surface resistivity is less than 10 4 -10 6 Ω range, with excellent surface flatness and conductivity.

[0024] The third aspect of the present application provides an electronic component packaging body, comprising the above-mentioned carrier tape. The electronic component packaging body is used for the storage, transportation and automated mounting process of electronic components, and is composed of a carrier tape and a cover tape. The cover tape is a transparent long strip of film. When the electronic component is placed in the carrier tape storage hole, the cover tape is used to seal and cover it, and then rolled into a roll to form an electronic component packaging body.

[0025] In the above electronic component packaging, the peeling curve of the carrier tape and the cover tape after being sealed is smooth, the peeling range is less than 25g, preferably less than 15g, and the sealing performance is excellent. The sealing conditions are: 200°C, 0.23MPa; the peeling conditions are: peeling angle 180°, peeling speed 300mm / min, and peeling length 100mm.

[0026] By implementing the above technical solution, the present invention has the following advantages: The present invention adopts a polycarbonate with a solubility parameter of 9.5-10, a first polymer with a first solubility parameter, a second polymer with a second solubility parameter and conductive carbon black to form a mixed system. The mixed system is melted to form a melt with an island structure. The viscosity of the melt is 1800-5000 Pa.S. The conductive carbon black is selectively distributed in the melt to form a complete and coherent conductive network in the form of long fibers. After the mixed system is made into particles as a raw material, the finished product not only has excellent conductive performance, but also improves the dispersibility of the conductive carbon black in the mixed system, reduces the number of convex points on the surface of the finished product, and has excellent surface smoothness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The following are the compositions of various embodiments and comparative examples. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Example 1 This embodiment provides a conductive polycarbonate composition, including: 80% by mass of polycarbonate LUPILON E2000R, with a melt index of 5 and a solubility parameter of 9.5; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0030] The melt viscosity of the conductive polycarbonate composition is 5000 Pa.S.

[0031] Example 2 This embodiment provides a conductive polycarbonate composition, including: 80 mass% polycarbonate Lexan 141R, melt index of 10, solubility parameter of 10; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0032] The melt viscosity of the conductive polycarbonate composition is 4500 Pa.S.

[0033] Example 3 This embodiment provides a conductive polycarbonate composition, including: 80% by mass of polycarbonate LUPILON S 3000R, with a melt index of 15 and a solubility parameter of 10; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0034] The melt viscosity of the conductive polycarbonate composition is 4000 Pa.S.

[0035] Example 4 This embodiment provides a conductive polycarbonate composition, including: 60% by mass of a first polycarbonate Lexan 141R having a melt index of 10; 20 mass % of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0036] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 3500 Pa.S.

[0037] Example 5 This embodiment provides a conductive polycarbonate composition, including: 20 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0038] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0039] Example 6 This embodiment provides a conductive polycarbonate composition, including: 40% by mass of a first polycarbonate Lexan 141R having a melt index of 10; 40% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0040] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 3000 Pa.S.

[0041] Example 7 This embodiment provides a conductive polycarbonate composition, including: 10 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 70% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0042] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2800 Pa.S.

[0043] Example 8 This embodiment provides a conductive polycarbonate composition, including: 10 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 70% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0044] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0045] Example 9 This embodiment provides a conductive polycarbonate composition, including: 10% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 70% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0046] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2000 Pa.S.

[0047] Example 10 This embodiment provides a conductive polycarbonate composition, including: 22% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 60% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 1 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0048] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0049] Embodiment 11 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 58% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 5 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0050] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0051] Example 12 This embodiment provides a conductive polycarbonate composition, including: 20.5 mass % of a first polycarbonate LUPILON S 3000R having a melt index of 15; 60% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 0.5 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0052] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2600 Pa.S.

[0053] Embodiment 13 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 59% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 2 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0054] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2200 Pa.S.

[0055] Embodiment 14 This embodiment provides a conductive polycarbonate composition, including: 22% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 55% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 4% by mass of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0056] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2100 Pa.S.

[0057] Embodiment 15 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 53% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 10 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0058] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 3000 Pa.S.

[0059] Example 16 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 57% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 6 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0060] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2800 Pa.S.

[0061] Embodiment 17 This embodiment provides a conductive polycarbonate composition, including: 22.5 mass % of a first polycarbonate LUPILON S 3000R having a melt index of 15; 60% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 0.5 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0062] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0063] Embodiment 18 This embodiment provides a conductive polycarbonate composition, including: 10% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 61% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 10% by mass of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0064] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 1800 Pa.S.

[0065] Embodiment 19 This embodiment provides a conductive polycarbonate composition, including: 10% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 15; 65% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 6 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0066] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2200 Pa.S.

[0067] Embodiment 20 This embodiment provides a conductive polycarbonate composition, including: 10.9 mass % of a first polycarbonate LUPILON S 3000R having a melt index of 15; 70% by mass of a second polycarbonate TAFLON IR 1700 having a melt index of 26; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 0.1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0068] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2600 Pa.S.

[0069] Embodiment 21 This embodiment provides a conductive polycarbonate composition, including: 15% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 10; 55% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 5% by mass of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 22 mass% of conductive carbon black, oil absorption value is 70mL / 100g.

[0070] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 5000 Pa.S.

[0071] Embodiment 22 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 10; 54 mass % of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 5% by mass of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 18 mass % of conductive carbon black, oil absorption value of 150 mL / 100 g.

[0072] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 4000 Pa.S.

[0073] Embodiment 23 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 5% by mass of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 12 mass % of conductive carbon black, oil absorption value of 200 mL / 100 g.

[0074] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 3000 Pa.S.

[0075] Embodiment 24 This embodiment provides a conductive polycarbonate composition, including: 20% by mass of a first polycarbonate LUPILON S 3000R having a melt index of 10; 64 mass % of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 5% by mass of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 8 mass % of conductive carbon black, oil absorption value of 350 mL / 100 g.

[0076] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0077] Embodiment 25 This embodiment provides a conductive polycarbonate composition, including: 20 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Exceed 3518, with a solubility parameter of 8.1; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0078] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2800 Pa.S.

[0079] Embodiment 26 This embodiment provides a conductive polycarbonate composition, including: 20 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Exceed 3518, with a solubility parameter of 8.1; 1 mass % of the second polymer LOTRYL 29MA03T, with a solubility parameter of 11.2; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0080] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2600 Pa.S.

[0081] Embodiment 27 This embodiment provides a conductive polycarbonate composition, including: 20 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3% by mass of the first polymer Desmopan CQ9385A, with a solubility parameter of 10.3; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0082] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2700 Pa.S.

[0083] Embodiment 28 This embodiment provides a conductive polycarbonate composition, including: 20 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1924, with a solubility parameter of 8.5; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0084] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2900 Pa.S.

[0085] Embodiment 29 This embodiment provides a conductive polycarbonate composition, including: 20 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 60% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Exceed 3518, with a solubility parameter of 8.1; 1 mass % of the second polymer ELVALOY AC 3427, with a solubility parameter of 10.9; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0086] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0087] Comparative Example 1 This comparative example provides a conductive polycarbonate composition comprising: 80% by mass of a second polycarbonate, Makrolon 2205, having a melt index of 37 and a solubility parameter of 10; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0088] The melt viscosity of the conductive polycarbonate composition is 1200 Pa.S.

[0089] Comparative Example 2 This comparative example provides a conductive polycarbonate composition comprising: 80% by mass of a second polycarbonate Lexan 121R having a melt index of 20 and a solubility parameter of 10; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0090] The melt viscosity of the conductive polycarbonate composition is 1500 Pa.S.

[0091] Comparative Example 3 This comparative example provides a conductive polycarbonate composition comprising: 80% by mass of a first polycarbonate, Makrolon 3638, having a melt index of 2 and a solubility parameter of 9.8; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0092] The melt viscosity of the conductive polycarbonate composition is 6500 Pa.S.

[0093] Comparative Example 4 This comparative example provides a conductive polycarbonate composition comprising: 80% by mass of a first polycarbonate Lexan 0703 having a melt index of 10 and a solubility parameter of 9.8; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 11; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0094] The melt viscosity of the conductive polycarbonate composition is 5500 Pa.S.

[0095] Comparative Example 5 This comparative example provides a conductive polycarbonate composition comprising: 84 mass % of a first polycarbonate Lexan 141R having a melt index of 10 and a solubility parameter of 10; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0096] The melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0097] Comparative Example 6 This comparative example provides a conductive polycarbonate composition, comprising: 64 mass % of a first polycarbonate Lexan 141R having a melt index of 10; 20 mass % of a second polycarbonate Lexan 121R having a melt index of 20; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0098] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 3000 Pa.S.

[0099] Comparative Example 7 This comparative example provides a conductive polycarbonate composition, comprising: 60% by mass of a first polycarbonate Lexan 141R having a melt index of 10; 21 mass % of a second polycarbonate Lexan 121R having a melt index of 20; 3 mass % of the first polymer Kraton 1657, with a solubility parameter of 8; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0100] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0101] Comparative Example 8 This comparative example provides a conductive polycarbonate composition, comprising: 60% by mass of a first polycarbonate Lexan 141R having a melt index of 10; 23% by mass of a second polycarbonate Lexan 121R having a melt index of 20; 1 mass % of the second polymer SKYGREEN S2008, with a solubility parameter of 8; 16 mass% of conductive carbon black, oil absorption value is 170mL / 100g.

[0102] The solubility parameter of the polycarbonate composed of the first polycarbonate and the second polycarbonate is 10; and the melt viscosity of the conductive polycarbonate composition is 2500 Pa.S.

[0103] Comparative Example 9 This comparative example provides a conductive polycarbonate composition, including: 76.8% polycarbonate, 8% PBT, 3% polyethyl acrylate, 3% ethylene butyl acrylate, 9% carbon black, 1% dispersant EVA wax, and 0.2% 1010 antioxidant. The melt viscosity of the conductive polycarbonate composition is 2200 Pa.S.

[0104] In order to facilitate the analysis and comparison of the composition of the conductive polycarbonate composition shown in each embodiment and comparative example, the composition of each embodiment and comparative example is statistically summarized in a table, see Figure 1 .

[0105] Application Examples The polycarbonate composition of the above-mentioned embodiment and comparative example is made into particles and used as a carrier raw material to make a carrier. The method can be: the particles are melt-extruded to form a conductive sheet and then cut into long strips, and storage holes matching the size and shape of the electronic components are formed at equal intervals to make a carrier; or the particles are melt-extruded to directly form a plurality of rows of parallel storage holes and then cut into a carrier.

[0106] Remark: LUPILON E2000R and LUPILON S 3000R are manufactured by Mitsubishi Engineering-Plastics Corporation and are made of polycarbonate; Lexan 141R, Lexan 121R, Lexan 0703 are made by SABIC, polycarbonate; Makrolon 2205 and Makrolon 3638 are made by Covestro and are polycarbonate; Kraton 1657 is manufactured by Kraton, USA, SEBS block copolymer; Kraton 1924 is made by Kraton in the United States, maleic anhydride grafted SEBS; SKYGREEN S2008 is polyethylene terephthalate-1,4-cyclohexane dimethanol ester (PETG) manufactured by SK of South Korea; Exceed 3518 is manufactured by ExxonMobil and is a metallocene linear low-density polyethylene; Desmopan CQ9385A is manufactured by Covestro and is a thermoplastic polyurethane elastomer (TPU); LOTRYL 29MA03T is manufactured by Arkema, ethylene-methyl acrylate random copolymer; ELVALOY AC 3427 is manufactured by DuPont, USA, and is an ethylene-butyl acrylate copolymer.

[0107] The obtained carrier tape was tested for relevant performances, and the test items, test methods and test results are as follows.

[0108] Test Method Bump height and number of bumps: The polycarbonate composition is melt-extruded into particles using a parallel twin-screw granulator. The particles are melt-extruded using a particle molding all-in-one machine to directly form a semi-finished carrier tape with multiple rows of parallel storage holes. At the same time, an online CCD detection method is used to count the bump height (measured by maximum height) and the number of bumps on the surface of the storage holes of a 10,000-meter-long semi-finished carrier tape. The bump height <0.5mm and the number of bumps <10 are qualified.

[0109] Surface resistivity: randomly select a 10 mm long sample section from the above carrier tape, and use a surface resistivity meter to randomly select 5 points to test the surface resistivity of the carrier tape with the receiving holes, and take the average value as the surface resistivity (Ω).

[0110] Peeling extreme value: The above carrier tape and Denka TIST-100 cover tape were sealed with a taping machine at 200°C and 0.23MPa, with a sealing length of 100mm. A tensile tester was used to peel the tape at a peeling angle of 180° and a peeling speed of 300mm / min. The difference between the maximum peeling force and the minimum peeling force was taken as the peeling extreme value (g).

[0111] The test results are shown in Table 1 below.

[0112] Table 1 Relevant properties of carrier tapes made from conductive polycarbonate compositions corresponding to various examples and comparative examples As can be seen from Table 1, the solubility parameters of the conductive polycarbonate compositions in the embodiments are all within the range of 9.5 to 10, and the first polymer and the second polymer with two different solubility parameters are added, and the melt viscosity of the composition is controlled to be 1800-5000 Pa.S, corresponding to the height of the protrusions on the carrier surface <0.5 mm, and the number of protrusions <10 / 10,000 m, and the surface resistivity is 10 4 -10 6 Ω, it has excellent surface flatness and conductivity. In different comparative examples, the adjustment of the conductive polycarbonate composition is outside the scope of the technical solution of the present invention, and it is impossible to simultaneously meet the high requirements of surface performance and conductive performance. Specifically, in the technical solution of comparative examples 1-2, the melt viscosity is 1500 Pa.S and 1200 Pa.S, respectively, both less than 1800 Pa.S. Although the conductive performance is comparable to that of the embodiment, the surface performance of the carrier tape is significantly reduced, the height of the bumps is too large, and the number of bumps is also significantly increased. The melt viscosities in comparative examples 3 and 4 are 6500 Pa.S and 5500 Pa.S, respectively, both greater than 5000 Pa.S. The results show that the surface resistivity of the carrier tape increases and the conductivity deteriorates. In the conductive polycarbonate composition of comparative example 5, only one polycarbonate is added, in comparative example 6, only two polycarbonates are added, and in comparative examples 7 and 8, two polycarbonates and a polymer are added. The results show that the height of the raised surface of the carrier tape corresponding to comparative examples 5 and 6 is too large, the number of bumps is too high, and the peeling extreme difference is also too large. Although the height of the protrusions on the carrier tapes corresponding to Comparative Examples 7 and 8 is less than 5 mm, the number of protrusions is relatively high. Comparative Example 9 is a conventional conductive polycarbonate composition, the number of protrusions is much higher than that of the carrier tape made from the conductive polycarbonate composition of the present invention, and the surface resistivity of the carrier tape is also relatively high.

[0113] In summary, the conductive polycarbonate composition of the present invention, by adding polycarbonate and two polymers with different solubility parameters at the same time and maintaining the melt viscosity between 1800 and 5000 Pa.S, can ensure that the height of the protrusions on the surface of the manufactured carrier tape is less than 0.5 mm, the number of protrusions is less than 10 per 10,000 meters, and the surface resistivity is within 10 4 -10 6 In the range of Ω.

Claims

1. A conductive polycarbonate composition, characterized in that: The invention comprises a polycarbonate with a solubility parameter of 9.5-10, a first polymer with a first solubility parameter, a second polymer with a second solubility parameter and conductive carbon black. The conductive polycarbonate composition is melted to form a melt with an island structure. The viscosity of the melt is 1800-5000 Pa.S.

2. The conductive polycarbonate composition according to claim 1, characterized in that The absolute value of the difference between the first solubility parameter and the solubility parameter of polycarbonate is 0.5-2.0, and the absolute value of the difference between the second solubility parameter and the solubility parameter of polycarbonate is 0.5-1.

5.

3. The conductive polycarbonate composition according to claim 1, characterized in that The polycarbonates include a first polycarbonate having a first melt index and a second polycarbonate having a second melt index.

4. The conductive polycarbonate composition according to claim 3, characterized in that: The first melt index is 5-15 g / 10 min (300° C., 1.2 kg), and the second melt index is 15-30 g / 10 min (300° C., 1.2 kg).

5. The conductive polycarbonate composition according to claim 1, characterized in that: The first polymer is a polyolefin elastomer and a graft-modified copolymer thereof.

6. The conductive polycarbonate composition according to claim 5, characterized in that: The polyolefin elastomer is a block copolymer having a hard segment and a soft segment.

7. The conductive polycarbonate composition according to claim 6, characterized in that: In the first polymer, the hard segment is selected from one of polystyrene, nylon, polyester, and polyisocyanate, and the soft segment is selected from one of ethylene butene copolymer, aliphatic polyester, polyether, and polyols.

8. The conductive polycarbonate composition according to claim 1 or 2, characterized in that: The second polymer is a copolyester polymer.

9. The conductive polycarbonate composition according to claim 1, characterized in that: The oil absorption value of the conductive carbon black is in the range of 150-300 mL / 100 g.

10. A carrier tape, characterized in that: The conductive polycarbonate composition is made from the conductive polycarbonate composition as described in any one of claims 1 to 9.

Images