Antistatic styrene copolymer for producing a carrier tape and a method for producing the same

Abstract

The present application relates to the technical field of antistatic material, and relates to an antistatic styrene copolymer for producing a carrier tape and a preparation method thereof, which comprises the following components in percentage by mass: HIPS 45%-60%, HIPS / PPO alloy 6%-10%, conductive carbon black 15%-25%, compatibilizer 5%-15%, toughening agent 6%-15%, carbon black dispersing agent 2%-5%, antioxidant 0.3%-0.8%, lubricant 0.5%-1%, and the carbon black dispersing agent comprises a coupling agent and a medium-long chain fatty tertiary amine. Through the synergistic design of the binary carbon black dispersing agent of the tertiary amine-coupling agent and the HIPS / PPO heat-resistant alloy, the problems of no crystal point, no carbon deposition, 225 DEG C heat sealing without melting, and no black falling in tearing of the styrene system filled with 15%-25% high carbon black are solved, and the industrial grade requirements of continuous high-speed production of the carrier tape are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of antistatic materials, and relates to an antistatic styrene copolymer for producing a carrier tape and a preparation method thereof. BACKGROUND

[0002] The carrier tape is an indispensable permanent antistatic packaging material for packaging chips and various electronic components, is a three-layer composite polymer tape product, generally has an intermediate layer (support layer) and upper and lower surface layers (antistatic layers), is made into a sheet through a "three-layer co-extrusion" process, and is then processed into a specific shape through secondary thermoforming. The intermediate layer is usually polycarbonate (PC) or acrylonitrile-butadiene-styrene copolymer (ABS), the surface layer is an antistatic polymer material having good compatibility with the intermediate layer (PC / ABS), and the carrier tape is provided with permanent antistatic properties to protect chips, capacitors, inductors, LEDs and other precision electronic components from static damage during transportation and storage.

[0003] The carrier tape product is instantaneously heat-sealed when packaging electronic components, and the surface layer material needs to have high heat resistance, and the material surface layer does not melt at a high temperature of 180-225℃. When the electronic components are unpacked, no carbon black should be adhered to the adhesive tape when the adhesive tape is torn off, and the production equipment extruder head should not have carbon accumulation and falling off during a long-time (8-12 hours) continuous production process to avoid forming defective products.

[0004] In the prior art, the conductive polystyrene system is widely used in the conductive layer of the carrier tape, but still has the following deficiencies:

[0005] Chinese Patent CN103351564A discloses a conductive polystyrene plastic for carrier tapes and a preparation method thereof, and the formula mainly comprises high-impact polystyrene (HIPS), linear low-density polyethylene (LLDPE), conductive carbon black and white oil, etc. Although the preliminary dispersion of the carbon black and the basic conductive performance are achieved, the carbon black content is relatively high (5%-20%), and problems such as uneven dispersion, easy falling off and limited heat-sealing temperature still exist, which are difficult to meet the requirements of high-speed carrier tapes on surface cleanliness and high-temperature heat-sealing stability.

[0006] Chinese Patent CN103483798A discloses an antistatic PPO / HIPS alloy and a preparation method thereof. The alloy is obtained by blending PPO and HIPS and compounding an antistatic agent such as monoglyceride, has good mechanical and flame-retardant properties, but its antistatic property depends on the small-molecule migration type additive, has poor durability, and does not involve the dispersion problem of a high-filled carbon black system, and thus cannot be applied to carrier tapes with high static electricity resistance requirements.

[0007] Chinese patent CN106832728A discloses a carbon black / polymer antistatic composite material and a preparation method thereof, which improves dispersibility by coating carbon black with polyacrylic acid (PAA) to achieve antistatic at low carbon black content, but its carbon black filling amount is limited, and the conductivity is insufficient to meet the low resistivity requirement of high-end carrier tape, and the processing thermal stability and carbon black shedding problem under high filling is not solved.

[0008] Chinese patent CN109608808A discloses an antistatic and flame-retardant polystyrene composition, a preparation method and application thereof, which realizes flame retardation and antistatic by compounding various additives, but its antistatic agent is permanent polyoxyethylene type, which is different from the carbon black conductive system, and the dispersion and thermal processing behavior under high carbon black filling are not optimized, and it cannot meet the harsh requirements of carbon black dispersity and heat seal strength in continuous high-speed forming of carrier tape.

[0009] In summary, the prior art cannot balance high carbon black filling, low surface resistance, high heat resistance, no carbon deposition, no black shedding and high toughness at the same time, and a new technical solution is needed to solve the above contradictions. SUMMARY

[0010] In order to overcome the shortcomings of the prior art, the present application provides an antistatic styrene copolymer for producing carrier tape and a preparation method thereof, which adopts the synergistic design of tertiary amine-coupling agent binary carbon black dispersant and HIPS-PPO heat-resistant alloy, and for the first time realizes no crystal point, no carbon deposition, 225℃ heat seal without melting, and no black shedding when tearing the tape in a styrene system with 15%-25% high carbon black filling, meeting the industrial requirements of continuous high-speed production of carrier tape.

[0011] The technical scheme of the present application is:

[0012] The first aspect of the present application discloses an antistatic styrene copolymer for producing carrier tape, which includes the following components in mass percentage: high impact polystyrene (HIPS) 45%-60%, HIPS / PPO alloy 6%-10%, conductive carbon black (CCB) 15%-25%, compatibilizer 5%-15%, toughening agent 6%-15%, carbon black dispersant 2%-5%, antioxidant 0.3%-0.8%, lubricant 0.5%-1%, the carbon black dispersant includes coupling agent and medium-long chain fatty tertiary amine, the coupling agent accounts for 0.2%-1.5% of the total mass of the formula, and the medium-long chain fatty tertiary amine accounts for 2%-5% of the total mass of the formula.

[0013] Further, the compatibilizer is one or both of styrene-maleic anhydride copolymer (SMA) and acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH).

[0014] Furthermore, the toughening agent is one or both of styrene-butadiene-styrene block copolymer (SBS) and styrene-ethylene-butene-styrene block copolymer (SEBS).

[0015] Furthermore, the medium- and long-chain aliphatic tertiary amine is selected from one or more of dioctadecylmethyl tertiary amine, dimethyl stearate tertiary amine, and tri-n-dodecylamine, and the coupling agent is a silane coupling agent or a titanate coupling agent.

[0016] Furthermore, the antioxidant is a compound composed of antioxidant 168 and antioxidant 1076 in a mass ratio of 1:2.

[0017] Furthermore, the lubricant is silicone powder or pentaerythritol stearate (PETS).

[0018] Furthermore, its tensile strength is 25 MPa-40 MPa, its flexural strength is 20 MPa-45 MPa, and its cantilever beam notched impact strength is 6 kJ / m. 2 -15kJ / m 2 Its density is 1.01 g / cm³. 3 -1.36g / cm 3 Melt flow rate: 1 g / 10 min - 15 g / 10 min (200 ℃, 5 kg); Surface resistivity: 10 Ω·cm 5 Ω-10 6 Ω.

[0019] A second aspect of this invention discloses a method for preparing the aforementioned antistatic styrene copolymer, comprising the following steps:

[0020] (1) HIPS and PPO were blended and granulated at a mass ratio of 80:20-90:10 at 250℃-280℃ to obtain HIPS / PPO alloy;

[0021] (2) The HIPS / PPO alloy, HIPS, conductive carbon black, compatibilizer, toughening agent, carbon black dispersant, antioxidant and lubricant are mixed in proportion, and then mixed and granulated at 220 ℃-250 ℃ to obtain antistatic styrene copolymer.

[0022] The third aspect of the present invention discloses a carrier tape comprising upper and lower surface layers and an intermediate layer, wherein the upper and lower surface layers are made of the aforementioned antistatic styrene copolymer, and the intermediate layer is polycarbonate (PC) or acrylonitrile-butadiene-styrene copolymer (ABS), prepared by a three-layer co-extrusion process.

[0023] The fourth aspect of this invention discloses the application of the aforementioned antistatic styrene copolymer in the preparation of carrier tapes.

[0024] The core technology of the present application includes dispersion of conductive carbon black, compatibility and combination of carbon black and polymer material, so that the material has high heat resistance, and the surface resistance value of the final product is 10 5 -10 6 Ω, surface matte, no crystal point, good smoothness, good mechanical properties and processing formability.

[0025] The present application selects a tertiary amine-coupling agent binary dispersant, because: conductive carbon black has high specific surface area and rich π electrons, and is prone to agglomeration through strong van der Waals force and π-π interaction, forming aggregates that cannot provide a conductive path, the tertiary amine can disassemble these aggregates and make the conductive carbon black stably distributed in the polymer matrix, thereby forming an efficient conductive network. The coupling agent acts as a "molecular bridge" to strengthen the interface bonding between carbon black and the polymer matrix.

[0026] Mechanism of action of tertiary amine: A tertiary amine molecule usually consists of a carbon black-loving nonpolar long-chain alkyl tail and a polar tertiary amine head group. Anchoring effect of nonpolar segment: The long-chain alkyl tail of the tertiary amine can strongly adsorb on the hydrophobic surface of the conductive carbon black through hydrophobic interaction and van der Waals force. This is a spontaneous process because the energy of the system is lower after adsorption.

[0027] Potential role of head group: The lone pair of electrons on the nitrogen atom of the tertiary amine can interact weakly with a small amount of oxygen-containing functional groups (such as carboxyl -COOH) on the surface of carbon black, and the main adsorption force comes from the interaction between the alkyl chain and the graphite crystal surface of carbon black. After adsorption, the tertiary amine prevents carbon black particles from re-aggregating mainly through the following ways:

[0028] When the tertiary amine molecules are densely adsorbed on the surface of the carbon black particles, the long-chain alkyl groups that extend outward form a "polymer chain" protective layer with a certain thickness and strength. When two carbon black particles wrapped by tertiary amine come close to each other, these extended alkyl chains begin to compress and overlap. This will result in two unfavorable entropy reduction processes: (1) reduction of the motion freedom of the chain segments (reduction of conformational entropy); (2) solvent molecules between the chains are squeezed out (dilution entropy reduction). According to the second law of thermodynamics, this entropy reduction process is not spontaneous. Therefore, an effective repulsive force is generated between the particles, preventing them from further approaching and agglomerating. This is the most core and effective stabilization mechanism of the tertiary amine as a dispersant.

[0029] This invention uses a HIPS / PPO alloy (HIPS:PPO mass ratio 80:20-90:10). Due to the high melting point of PPO (280 ℃), it needs to be blended and granulated using a twin-screw extruder at 250 ℃-280 ℃. Both HIPS and PPO molecules contain benzene rings and other structural units, thus exhibiting a certain degree of compatibility. Both molecules contain a large number of benzene rings, which can generate strong π-π conjugated interactions. This intermolecular force is far stronger than ordinary van der Waals forces, essentially forming countless "tiny hands" between the two molecular chains, tightly binding them together.

[0030] Secondly, the solubility of these two resins is very close: PPO has a solubility of 19, and HIPS has a solubility of 18.6. The difference between them is very small (generally, Δδ < 0.5 (J / cm³)^1 / 2 is considered to indicate good compatibility), indicating that PPO and HIPS have a strong thermodynamic tendency to spontaneously mix. This means that during melt blending, the two polymer chains can diffuse into each other, eventually forming a homogeneous structure at the microscale (molecular chain level). The strength of this interaction is even sufficient to overcome the strong interchain interactions of the PPO molecular chains themselves, allowing them to be "diluted" and "isolated" by the HIPS molecular chains, ultimately forming a compatible homogeneous system.

[0031] The advantages and beneficial effects of this invention are:

[0032] (1) The synergistic design of the tertiary amine-coupling agent binary dispersant and HIPS-PPO heat-resistant alloy solved the dispersion problem of 15%-25% high-content conductive carbon black in a styrene matrix. The long-chain alkyl group of the tertiary amine effectively prevents the re-agglomeration of carbon black particles through steric hindrance, while the coupling agent acts as a "molecular bridge" to strengthen the interfacial bonding between carbon black and the polymer matrix. This synergistic design ensures that carbon black is stably and uniformly dispersed at the scale of primary aggregates from both thermodynamic and kinetic perspectives, fundamentally eliminating crystal point defects caused by carbon black agglomeration, and avoiding carbon deposition caused by carbon black retention and decomposition during processing.

[0033] (2) Taking advantage of the similar solubility parameters of HIPS and PPO and the strong π-π conjugated interaction generated by the benzene ring structure, a HIPS / PPO alloy was prepared in advance. This alloy not only significantly improves the heat resistance of the material to meet the industrial-grade requirement of not melting in the 225℃ heat sealing process, but also ensures that the material still has good melt flowability and processability in the relatively low processing window of 220-250℃ due to the good compatibility of the two.

[0034] In summary, the prepared styrene copolymer is free of crystal points and carbon deposits, does not melt when heat-sealed at 225 ℃, and does not shed black residue when torn, meeting the industrial-grade requirements for continuous high-speed production of carrier tapes. Detailed Implementation

[0035] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0036] High-impact polystyrene (HIPS): Shanghai SECCO Petrochemical Co., Ltd., resin grade 622; or Dushanzi Petrochemical Co., Ltd., HIE-1.

[0037] Conductive carbon black: Cabot Chemicals (Tianjin) Co., Ltd., grade BP2000. Or Tianjin Baochi Chemical Technology Co., Ltd., BC-90.

[0038] PPO: Ruicheng Lanxing Chemical Co., Ltd., LXR040.

[0039] Styrene-maleic anhydride copolymer (SMA) Jiaxing Huawen Chemical Co., Ltd., SMA-700.

[0040] Acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH), Shenyang Ketong Plastics Co., Ltd., KT-2.

[0041] Styrene-butadiene-styrene (SBS): Yueyang Baling Petrochemical Co., Ltd., YH-792.

[0042] Silane coupling agent: Anhui Boiling Point New Materials Co., Ltd., FD-550A.

[0043] Titanate coupling agent: Anhui Boiling Point New Materials Co., Ltd., FD-201.

[0044] Dioctadecylmethyl tertiary amine: Nantong Zhonghe Chemical Co., Ltd.

[0045] Dimethyl stearate: Wuhan Jiyesheng Chemical Co., Ltd.

[0046] Antioxidant 168: Anhui Xinxiu Chemical Co., Ltd.

[0047] Antioxidant 1076: Tianjin Lianlong New Materials Co., Ltd.

[0048] Silicone powder: Chengdu Silike Technology Co., Ltd., S-201.

[0049] Pentaerythritol stearate (PETS): Qingdao Sainuo New Materials Co., Ltd., 603.

[0050] Example 1

[0051] An antistatic styrene copolymer for producing carrier tapes, comprising the following components by weight percentage:

[0052] High-impact polystyrene (HIPS) 57.5%;

[0053] Conductive carbon black (CCB) 18%,

[0054] HIPS / PPO alloy 6%;

[0055] Compatibilizers: 3% styrene-maleic anhydride copolymer (SMA), 5% maleic anhydride-grafted acrylonitrile-butadiene-styrene copolymer (ABS-g-MAH);

[0056] Toughening agent: 6% styrene-butadiene-styrene block copolymer (SBS);

[0057] Carbon black dispersant: 0.5% silane coupling agent, 3% dioctadecylmethyl tertiary amine;

[0058] Antioxidant: 0.3% of a compound of antioxidant 168 and antioxidant 1076 in a 1:2 mass ratio;

[0059] Lubricant: 0.7% silicone powder.

[0060] The preparation method includes the following steps:

[0061] (1) HIPS and PPO were blended and granulated at 260°C at a mass ratio of 80:20 to obtain HIPS / PPO alloy;

[0062] (2) HIPS / PPO alloy, HIPS, conductive carbon black, compatibilizer, toughening agent, carbon black dispersant, antioxidant and lubricant are mixed in proportion, and then mixed and granulated at 240 °C to obtain antistatic styrene copolymer.

[0063] Example 2

[0064] The only difference from Example 1 is that, by mass percentage, it includes the following components:

[0065] High-impact polystyrene (HIPS) 48.7%;

[0066] Conductive carbon black (CCB) 22%;

[0067] HIPS / PPO alloy 6%;

[0068] Compatibilizers: 5% styrene-maleic anhydride copolymer (SMA), 6% acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH).

[0069] Toughening agent: 6% styrene-butadiene-styrene block copolymer (SBS),

[0070] Carbon black dispersant: titanate coupling agent 0.8%, dimethyl tertiary amine stearate 4%.

[0071] Antioxidant: 0.5% of a compound of antioxidant 168 and antioxidant 1076 in a 1:2 mass ratio.

[0072] Lubricant: Pentaerythritol stearate (PETS) 1%.

[0073] Comparative Example 1 (without tertiary amines)

[0074] The only difference from Example 1 is that, by weight percentage, it includes the following components: 57.5% high-impact polystyrene (HIPS), 18% conductive carbon black (CCB), 6% HIPS / PPO alloy, 3% styrene-maleic anhydride copolymer (SMA), 5% acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH), 6% styrene-butadiene-styrene (SBS), 3.5% silane coupling agent, 0.3% antioxidant (a blend of antioxidant 168 and antioxidant 1076 in a 1:2 weight ratio), and 0.7% silicone powder.

[0075] Comparative Example 2 (without coupling agent)

[0076] The only difference from Example 1 is that, by weight percentage, it includes the following components: High-impact polystyrene (HIPS): 64.5%, conductive carbon black (CCB) 18%, HIPS / PPO alloy 5%, styrene-maleic anhydride copolymer (SMA) 3%, acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH) 5%, dioctadecylmethyl tertiary amine 3.5%, antioxidant (a compound of antioxidant 168 and antioxidant 1076 in a 1:2 weight ratio) 0.3%, and silicone powder 0.7%.

[0077] Comparative Example 3 (without HIPS / PPO alloy)

[0078] The only difference from Example 1 is that, by weight percentage, it includes the following components: 63.5% high-impact polystyrene (HIPS), 18% conductive carbon black (CCB), 3% styrene-maleic anhydride copolymer (SMA), 5% acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH), 6% styrene-butadiene-styrene (SBS), 0.5% silane coupling agent, 3% dioctadecylmethyl tertiary amine, 0.3% antioxidant (a blend of antioxidant 168 and antioxidant 1076 in a 1:2 weight ratio), and 0.7% silicone powder.

[0079] Comparative Example 4 (Conventional Dispersant)

[0080] The only difference from Example 1 is that, by weight percentage, it includes the following components: 58.5% high-impact polystyrene (HIPS), 18% conductive carbon black (CCB), 5% HIPS / PPO alloy, 3% styrene-maleic anhydride copolymer (SMA), 5% acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH), 8% styrene-butadiene-styrene (SBS), 1.5% ethylene bis-stearamide (EBS), 0.3% antioxidant (a blend of antioxidant 168 and antioxidant 1076 in a 1:2 weight ratio), and 0.7% silicone powder.

[0081] Comparative Example 5 (Low Carbon Black)

[0082] The only difference from Example 1 is that, by weight percentage, it includes the following components: 64.5% high-impact polystyrene (HIPS), 12% conductive carbon black (CCB), 5% HIPS / PPO alloy, 3% styrene-maleic anhydride copolymer (SMA), 5% acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH), 6% styrene-butadiene-styrene (SBS), 0.5% silane coupling agent, 3% dioctadecylmethyl tertiary amine, 0.3% antioxidant (a compound of antioxidant 168 and antioxidant 1076 in a 1:2 mass ratio), and 0.7% silicone powder.

[0083] Comparative Example 6

[0084] The only difference from Example 1 is that PPO is added separately and not made into a HIPS / PPO alloy.

[0085] By weight percentage, it includes the following components: 61% high-impact polystyrene (HIPS), 18% conductive carbon black (CCB), 2.5% PPO, 3% styrene-maleic anhydride copolymer (SMA), 5% acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer (ABS-g-MAH), 6% styrene-butadiene-styrene (SBS), 0.5% silane coupling agent, 3% dioctadecylmethyl tertiary amine, 0.3% antioxidant (a blend of antioxidant 168 and antioxidant 1076), and 0.7% silicone powder.

[0086] Performance tests were conducted on the antistatic styrene copolymers of the examples and comparative examples:

[0087] Mechanical properties include tensile strength (GB / T-1040-2018), flexural strength (GB / T 9341-2008), notched impact strength of cantilever beam (GB / T 1843-2008), and density (GB / T 1033-2018).

[0088] During production, it is necessary to control the melt flow rate within a reasonable range. Since it is a three-layer co-extrusion process, the melt flow rate of the antistatic surface layer needs to match that of the intermediate layer (PC or ABS); otherwise, it will affect the extrusion molding. Excessive or insufficient flow rate of the surface layer will result in over-coating or uneven coating, affecting product quality. The melt flow rate test method refers to GB / T 3683-2000, and the surface resistivity test method refers to GB / T 1410-2006.

[0089] The surface crystal points, die-hole carbon deposits, and heat-sealing blackening were observed using the adhesive tape peeling method, as shown in Table 1.

[0090] Table 1

[0091]

[0092] As shown in Table 1, the tensile strength of the antistatic styrene copolymer in the examples is 25 MPa-40 MPa, the flexural strength is 20 MPa-45 MPa, and the notched cantilever beam impact strength is 6 kJ / m. 2 -15kJ / m 2 Density: 1.01 g / cm³ 3 -1.36g / cm 3 Melt flow rate of 5kg at 200℃: 1g / 10min-15g / 10min, surface resistivity: 10 5 Ω -10 6 Ω.

[0093] In Comparative Example 1, without tertiary amine dispersant, the conductive carbon black dispersion was not ideal, and a small number of crystal points appeared on the surface of the carrier tape, with an average of about 1 small crystal point per meter.

[0094] In Comparative Example 2, without coupling agent, carbon deposits increased.

[0095] In Comparative Example 3, without HIPS / PPO alloy, resin residue and black residue appeared on the surface of the heat sealing die during heat sealing of the carrier tape with film coating.

[0096] Comparative Example 4 showed that conventional dispersants such as ethylene bis-stearamide (EBS) and polyethylene wax had a weak dispersing effect on conductive carbon black, mainly due to poor effect on the mutual adsorption and aggregation of surface charges of conductive carbon black. This resulted in more crystal points appearing on the carrier surface, increased carbon deposition, and failure to meet the requirement of no crystal points in the product.

[0097] Comparative Example 5: Low levels of conductive carbon black are beneficial for dispersion, but reduce the conductivity of the carrier (surface resistivity 10). 11 The Ω value decreases accordingly, failing to meet the product's antistatic requirements.

[0098] Adding PPO alone in Comparative Example 6, without forming an HIPS / PPO alloy, results in a large difference in processing temperature between PPO resin (around 280℃) and HIPS resin (around 180℃) in the mixing process. In a system where HIPS is the main resin, this leads to a weakening of the screw shearing effect during mixing, affecting the dispersion of conductive carbon black and resulting in a small number of crystal points.

[0099] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these all fall within the protection scope of the present invention.

Claims

1. An antistatic styrene copolymer for producing a carrier tape, characterized by, The formula includes the following components by mass percentage: HIPS 45%-60%, HIPS / PPO alloy 6%-10%, conductive carbon black 15%-25%, compatibilizer 5%-15%, toughening agent 6%-15%, carbon black dispersant 2%-5%, antioxidant 0.3%-0.8%, lubricant 0.5%-1%, the carbon black dispersant includes a coupling agent and a medium-long chain fatty tertiary amine, the coupling agent accounts for 0.2%-1.5% of the total mass of the formula, the medium-long chain fatty tertiary amine accounts for 2%-5% of the total mass of the formula, the medium-long chain fatty tertiary amine is selected from one or more than two of distearylmethyl tertiary amine, dimethyl stearyl tertiary amine and tri-n-dodecylamine.

2. The antistatic styrene copolymer according to claim 1, characterized in that, The compatibilizer is one or both of styrene-maleic anhydride copolymer and acrylonitrile-butadiene-styrene grafted maleic anhydride copolymer.

3. The antistatic styrene copolymer according to claim 1, characterized in that, The toughening agent is one or both of styrene-butadiene-styrene block copolymer and styrene-ethylene-butylene-styrene block copolymer.

4. The antistatic styrene copolymer according to claim 1, characterized in that, The coupling agent is a silane coupling agent or a titanate coupling agent.

5. The antistatic styrene copolymer according to claim 1, characterized in that, The antioxidant is a compound of antioxidant 168 and antioxidant 1076 in a mass ratio of 1:

2.

6. The antistatic styrene copolymer according to claim 1, characterized in that, The lubricant is silicone powder or pentaerythritol stearate.

7. The antistatic styrene copolymer according to claim 1, characterized in that, having a tensile strength of 25 MPa - 40 MPa, a flexural strength of 20 MPa - 45 MPa, a Charpy notched impact strength of 6 kJ / m 2 - 15 kJ / m 2 , a density of 1.01 g / cm 3 - 1.36 g / cm 3 , a melt flow rate at 200 °C, 5 kg of 1 g / 10 min - 15 g / 10 min, and a surface resistivity of 10 5 Ω - 10 6 Ω.

8. A process for the preparation of an antistatic styrene copolymer as claimed in any one of claims 1 to 7, characterized in that, The method includes the following steps: (1) blending and granulating HIPS and PPO in a mass ratio of 80:20-90:10 at 250-280°C to obtain HIPS / PPO alloy; (2) mixing the HIPS / PPO alloy, HIPS, conductive carbon black, compatibilizer, toughening agent, carbon black dispersant, antioxidant and lubricant in proportion, and then mixing and blending under pressure at 220-250°C, and granulating to obtain the antistatic styrene copolymer.

9. A carrier tape comprising upper and lower surface layers and an intermediate layer, characterized in that The materials of the upper and lower layers are made of the antistatic styrene copolymer of any one of claims 1-7, and the intermediate layer is polycarbonate or acrylonitrile-butadiene-styrene copolymer, and the three layers are prepared by a three-layer co-extrusion process.

10. Use of the antistatic styrene copolymer of any one of claims 1-7 in the preparation of a carrier tape.

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