Sheet material applied to USBC, preparation method and equipment thereof

Abstract

The invention discloses a sheet material applied to USBC, and a preparation method and equipment thereof. The preparation method comprises the following steps: weighing polycarbonate, an acrylonitrile-styrene-butadiene copolymer, a methyl methacrylate-butadiene-styrene copolymer, a hardness modifier, an antioxidant, a lubricant, an inhibitor and a compatilizer; after uniformly mixing, putting the mixture into a preset twin-screw extrusion device, and setting the temperature of a heating area and the temperature of a die head; discharging through a double-screw extrusion device; cooling and drying; dicing is performed; and finally, placing in a preset mold for injection molding. The modified PC / ABS material prepared by the invention has good water absorption performance, crystallization performance and deformation performance; the modified PC / ABS is adopted to replace traditional PA to be made into the sheet, the sheet has the advantages of being good in fluidity, good in toughness and high in strength, the water absorption performance, the crystallization performance and the deformation performance are remarkably improved, the size is more stable, the sheet is more durable, the water absorption rate and internal stress are reduced, crystallization and deformation are not prone to occurring, and the product quality is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of USBC materials, and in particular to a USBC sheet material, a preparation method and a device thereof. Background Art

[0002] Current electronic devices are usually equipped with interfaces for connection and data exchange, and USBC is one of them.

[0003] USBC is a USB-C interface, which usually has a thin sheet inside. In the prior art, this thin sheet is usually made of nylon (PA), which has the advantages of good fluidity, good toughness and high strength. However, the water absorption rate of this material is too large, and it is easy to deform after absorbing water, resulting in unstable size of the thin sheet.

[0004] Therefore, there is an urgent need to develop stable and durable sheet materials. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a USBC sheet material, a preparation method and a device thereof.

[0006] The present invention proposes a USBC sheet material, which is composed of the following components and weight percentages:

[0007] Polycarbonate: 20-60%;

[0008] Acrylonitrile-styrene-butadiene copolymer: 10-50%;

[0009] Methyl methacrylate-butadiene-styrene copolymer: 1-20%;

[0010] Hardness modifier: 5-50%;

[0011] Antioxidant: 0.1-0.8%;

[0012] Lubricant: 0.1-5.0%;

[0013] Inhibitor: 0.1-1.0%;

[0014] Compatibilizer: 1-20%.

[0015] Furthermore, the polycarbonate is 20000-45000 g / mol of bisphenol A type aromatic polycarbonate.

[0016] Further, the weight percentage of the acrylonitrile-styrene-butadiene copolymer is:

[0017] Styrene content 35-65%;

[0018] Acrylonitrile content 15-55%;

[0019] Butadiene content 15-50%;

[0020] The acrylonitrile-styrene-butadiene copolymer is synthesized by emulsion polymerization or bulk polymerization according to the above weight percentage.

[0021] Furthermore, in the methyl methacrylate-butadiene-styrene copolymer, the ratio of methyl methacrylate:butadiene:styrene is 1:2:1; the methyl methacrylate-butadiene-styrene copolymer is synthesized by emulsion polymerization according to the above ratio.

[0022] Furthermore, the hardness modifier includes triphenyl phosphate, diphenyl phosphate, silicone, polyurethane and montan wax, and the ratio of triphenyl phosphate: diphenyl phosphate: silicone: polyurethane: montan wax is 5:5:5:5:2.

[0023] Furthermore, the antioxidant includes a primary antioxidant and an auxiliary antioxidant; the lubricant is ethylene bisstearamide; and the inhibitor is alkyl phosphate.

[0024] Furthermore, the compatibilizer is ethylene-methyl acrylate.

[0025] The present invention provides a preparation method for USBC sheet material, comprising the following steps:

[0026] S1, weighing the polycarbonate, the acrylonitrile-styrene-butadiene copolymer, the methyl methacrylate-butadiene-styrene copolymer, the hardness modifier, the antioxidant, the lubricant, the inhibitor and the compatibilizer according to weight ratio;

[0027] S2, mixing the polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer uniformly, placing the mixture in a preset twin-screw extruder, and setting the heating zone temperature, die head temperature and residence time;

[0028] S3, discharging the material through the twin-screw extruder to obtain modified PC / ABS;

[0029] S4, cooling;

[0030] S5, dry;

[0031] S6, pelleting;

[0032] S7, placing it in a preset mold for injection molding to obtain a USBC sheet.

[0033] The invention provides a USBC thin sheet.

[0034] The present invention provides an apparatus for USBC sheet materials, which comprises a twin-screw extruder, a feed port, a die head and a mold, wherein the feed port and the die head are respectively arranged on the twin-screw extruder, and the die head is arranged toward the mold; a plurality of heating areas are arranged between the feed port and the die head, and the material enters from the material port, flows through the plurality of heating areas in sequence, and discharges the heating areas from the die head, and discharges the material from the die head.

[0035] The present invention has the following beneficial effects:

[0036] The modified PC / ABS material prepared in the present application has good water absorption, crystallization and deformation properties; the modified PC / ABS material is used to replace the traditional PA to make USBC sheets, which not only has the characteristics of good fluidity, good toughness and high strength, but also the prepared sheets are stable in size, more durable, have low water absorption and internal stress, are not easy to crystallize and deform, and improve product quality; and the present application further improves the processing performance, aging resistance and production efficiency of the material by adding hardness modifiers, antioxidants, lubricants, inhibitors and compatibilizers. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A process flow chart of a preparation method for USBC sheet material proposed by the present invention;

[0038] Figure 2 This is a schematic structural diagram of a device applied to USBC sheet materials in one embodiment of the present invention.

[0039] Description of reference numerals: twin-screw extruder 1, feed port 2, die head 3, mold 4, heating area 5. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] See attached Figure 1 , a thin sheet material used in USBC, composed of the following components and weight percentages:

[0043] Polycarbonate: 20-60%;

[0044] Acrylonitrile-styrene-butadiene copolymer: 10-50%;

[0045] Methyl methacrylate-butadiene-styrene copolymer: 1-20%;

[0046] Hardness modifier: 5-50%;

[0047] Antioxidant: 0.1-0.8%;

[0048] Lubricant: 0.1-5.0%;

[0049] Inhibitor: 0.1-1.0%;

[0050] Compatibilizer: 1-20%.

[0051] In this embodiment, polycarbonate is referred to as PC, also known as PC plastic; PC / ABS is a mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer, which is a thermoplastic plastic synthesized from polycarbonate (PC) and polyacrylonitrile (ABS) and has good formability and impact resistance. In a specific embodiment, polycarbonate is 20000-45000g / mol of bisphenol A type aromatic polycarbonate, and the weight ratio is 20-60%; the weight ratio of acrylonitrile-styrene-butadiene copolymer is 10-50%, styrene content is 35-65%; acrylonitrile content is 15-55%; butadiene content is 15-50%; wherein, acrylonitrile-styrene-butadiene copolymer (ABS) is synthesized by emulsion polymerization or bulk polymerization. Emulsion polymerization is to disperse the monomer in water with the help of emulsifier and mechanical stirring to form an emulsion, and then add an initiator to initiate the polymerization of the monomer. Bulk polymerization is a polymerization reaction that is self-polymerized by an initiator or under the action of light, heat, or radiation without the addition of a solvent or dispersant. The weight ratio of methyl methacrylate-butadiene-styrene copolymer is 1-20%. In the methyl methacrylate-butadiene-styrene copolymer, the ratio of methyl methacrylate: butadiene: styrene is 1:2:1, and it is synthesized by polycondensation and dehydration by emulsion polymerization, wherein polycondensation and dehydration refers to a dehydration condensation reaction, that is, two or more molecules interact with each other and are covalently bonded to form a large molecule, while losing water. The weight ratio of the hardness modifier is 5-50%; the hardness modifier includes triphenyl phosphate, diphenyl phosphate, silicone, polyurethane, and montan wax, and the ratio of triphenyl phosphate: diphenyl phosphate: silicone: polyurethane: montan wax is 5:5:5:5:2, wherein silicone is a polymer structure substance. The weight ratio of the antioxidant is 0.1-0.8%, including a main antioxidant and an auxiliary antioxidant. Preferably, the main antioxidant is antioxidant 1010, and the main antioxidant is antioxidant 168. Among them, antioxidant 1010 is pentaerythritol fat, which is a white crystalline powder; antioxidant 168 is a phosphite antioxidant. The weight ratio of the lubricant is 0.1-5.0%, and it is ethylene bisstearamide. The weight ratio of the inhibitor is 0.1-1.0%, which is an alkyl phosphate ester ester exchange inhibitor, wherein the chemical formula of the alkyl phosphate is RO-PO(OH)2, (RO)2PO(OH), (RO)3PO; ester exchange is the reaction of converting -OR, -SR bonded to the acyl group in the ester molecule into -OR', -SR'. The weight ratio of the compatibilizer is 1-20%, which is ethylene-methyl acrylate, that is, ethylene-methyl acrylate copolymer.

[0052] See attached Figure 1 , the present application proposes a preparation method for USBC sheet material, comprising the following steps:

[0053] S1, weighing polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer according to weight ratio;

[0054] S2, mixing polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer uniformly, placing the mixture in a preset twin-screw extruder, and setting the heating zone temperature, die head temperature and residence time;

[0055] S3, discharging the material through a twin-screw extruder to obtain modified PC / ABS;

[0056] S4, cooling;

[0057] S5, dry;

[0058] S6, pelleting;

[0059] S7, placing it in a preset mold for injection molding to obtain a USBC sheet.

[0060] In the above steps, polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer are first weighed according to weight ratio, mixed evenly and then sent into a twin-screw extruder, and the heating zone temperature, die head temperature and residence time are set; in a specific embodiment, the heating zone temperature includes zone 1 temperature, zone 2 temperature, zone 3 temperature, zone 4 temperature, zone 5 temperature, zone 6 temperature, zone 7 temperature Temperature, zone 8 temperature and zone 9 temperature. In another specific embodiment, zone 1 temperature is 230-240°C, zone 2 temperature is 245-250°C, zone 3 temperature is 250-260°C, zone 4 temperature is 250-260°C, zone 5 temperature is 240-250°C, zone 6 temperature is 240-250°C, zone 7 temperature is 240-250°C, zone 8 temperature is 240-250°C, zone 9 temperature is 240-250°C, and die head temperature is 240-250°C. The residence time is 1.5-2min, the speed of the twin-screw extruder is 300-450r / min; the pressure value is set to 15-18Mpa. Then the material is discharged through the twin-screw extruder to obtain modified PC / ABS (thermoplastic adhesive synthesized from polycarbonate and acrylonitrile-butadiene-styrene copolymer). After the material is discharged, it is cooled, dried and pelletized in sequence; finally, it is placed in a mold for injection molding to obtain a USBC (USB-C interface) sheet, wherein the injection molding temperature is 230-250° C. and the mold temperature is 90±10° C. The sheet finally obtained has appropriate tension, stable size, not easy to deform, and is more durable.

[0061] Reference Figure 2The present application proposes a device for USBC sheet materials, including a twin-screw extruder, a feed port, a die head and a mold, wherein the feed port and the die head are respectively arranged on the twin-screw extruder, and the die head is arranged toward the mold; a plurality of heating areas are arranged between the feed port and the die head, and the material enters from the material port, flows through the plurality of heating areas in sequence, and is discharged from the die head.

[0062] In specific implementation, the feed port and the die head are respectively arranged on a twin-screw extruder, and a screw is arranged in the twin-screw extruder, which can push and extrude the material after transmission. The heating area is arranged in the twin-screw extruder and is used for heating.

[0063] More specifically, polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer are mixed evenly and poured into the feed port, and then a twin-screw extruder pushes the mixture forward, and the mixture is heated by passing through a plurality of heating zones, and then extruded by a die head, and finally the extruded material is placed in a mold for injection molding.

[0064] See attached Figure 1 , is a preparation method for USBC sheet material in one embodiment of the present invention, wherein:

[0065] Example 1

[0066] A method for preparing a USBC sheet material is prepared according to the following steps:

[0067] S1. Weigh a weight ratio of 20-60% polycarbonate, 10-50% acrylonitrile-styrene-butadiene copolymer, 1-20% methyl methacrylate-butadiene-styrene copolymer, 5-50% hardness modifier, 0.1-0.8% antioxidant, 0.1-5.0% lubricant, 0.1-1.0% inhibitor and 1-20% compatibilizer;

[0068] S2. The polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer are mixed and placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 230-240°C, the temperature of zone 2 is 245-250°C, the temperature of zone 3 is 250-260°C, the temperature of zone 4 is 250-260°C, the temperature of zone 5 is 240-250°C, the temperature of zone 6 is 240-250°C, the temperature of zone 7 is 240-250°C, the temperature of zone 8 is 240-250°C, the temperature of zone 9 is 240-250°C, and the die temperature is 240-250°C; the residence time is 1.5-2min, the main engine speed is 300-450r / min, and the pressure value is 15-18Mpa;

[0069] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0070] S5. Cool and dry;

[0071] S6. Pelletizing;

[0072] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 90 ± 10°C.

[0073] Example 2

[0074] A method for preparing a USBC sheet material is prepared according to the following steps:

[0075] S1. Weigh 59% polycarbonate, 20% acrylonitrile-styrene-butadiene copolymer, 2% methyl methacrylate-butadiene-styrene copolymer, 15% hardness modifier, 0.3% antioxidant, 0.2% lubricant, 0.5% inhibitor and 3% compatibilizer in a high-speed mixer and mix well;

[0076] S2 is placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 240 ° C, the temperature of zone 2 is 250 ° C, the temperature of zone 3 is 250-260 ° C, the temperature of zone 4 is 260 ° C, the temperature of zone 5 is 250 ° C, the temperature of zone 6 is 250 ° C, the temperature of zone 7 is 250 ° C, the temperature of zone 8 is 250 ° C, the temperature of zone 9 is 250 ° C, and the die temperature is 240-250 ° C; the residence time is 1.5 min, the main engine speed is 440 r / min, and the pressure value is 16Mpa;

[0077] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0078] S5. Cool and dry;

[0079] S6. Pelletizing;

[0080] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 95 ± 5°C.

[0081] Example 3

[0082] A method for preparing a USBC sheet material is prepared according to the following steps:

[0083] S1. Weigh 49% polycarbonate, 30% acrylonitrile-styrene-butadiene copolymer, 2% methyl methacrylate-butadiene-styrene copolymer, 15% hardness modifier, 0.3% antioxidant, 0.2% lubricant, 0.5% inhibitor and 3% compatibilizer in a high-speed mixer and mix well;

[0084] S2 is placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 240 ° C, the temperature of zone 2 is 250 ° C, the temperature of zone 3 is 250-260 ° C, the temperature of zone 4 is 260 ° C, the temperature of zone 5 is 250 ° C, the temperature of zone 6 is 250 ° C, the temperature of zone 7 is 250 ° C, the temperature of zone 8 is 250 ° C, the temperature of zone 9 is 250 ° C, and the die temperature is 240-250 ° C; the residence time is 1.5 min, the main engine speed is 440 r / min, and the pressure value is 16Mpa;

[0085] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0086] S5. Cool and dry;

[0087] S6. Pelletizing;

[0088] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 95 ± 5°C.

[0089] That is, the same as Example 2, except that the ratio of the polycarbonate and the acrylonitrile-styrene-butadiene copolymer in S1 is adjusted.

[0090] Example 4

[0091] A method for preparing a USBC sheet material is prepared according to the following steps:

[0092] S1. Weigh 39% polycarbonate, 40% acrylonitrile-styrene-butadiene copolymer, 2% methyl methacrylate-butadiene-styrene copolymer, 15% hardness modifier, 0.3% antioxidant, 0.2% lubricant, 0.5% inhibitor and 3% compatibilizer in a high-speed mixer and mix well;

[0093] S2 is placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 240 ° C, the temperature of zone 2 is 250 ° C, the temperature of zone 3 is 250-260 ° C, the temperature of zone 4 is 260 ° C, the temperature of zone 5 is 250 ° C, the temperature of zone 6 is 250 ° C, the temperature of zone 7 is 250 ° C, the temperature of zone 8 is 250 ° C, the temperature of zone 9 is 250 ° C, and the die temperature is 240-250 ° C; the residence time is 1.5 min, the main engine speed is 440 r / min, and the pressure value is 16Mpa;

[0094] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0095] S5. Cool and dry;

[0096] S6. Pelletizing;

[0097] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 95 ± 5°C.

[0098] That is, the same as Example 2, except that the ratio of the polycarbonate and the acrylonitrile-styrene-butadiene copolymer in S1 is adjusted.

[0099] Example 5

[0100] A method for preparing a USBC sheet material is prepared according to the following steps:

[0101] S1. Weigh 59% polycarbonate, 10% acrylonitrile-styrene-butadiene copolymer, 2% methyl methacrylate-butadiene-styrene copolymer, 15% hardness modifier, 0.3% antioxidant, 0.2% lubricant, 0.5% inhibitor and 3% compatibilizer in a high-speed mixer and mix well;

[0102] S2 is placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 240 ° C, the temperature of zone 2 is 250 ° C, the temperature of zone 3 is 250-260 ° C, the temperature of zone 4 is 260 ° C, the temperature of zone 5 is 250 ° C, the temperature of zone 6 is 250 ° C, the temperature of zone 7 is 250 ° C, the temperature of zone 8 is 250 ° C, the temperature of zone 9 is 250 ° C, and the die temperature is 240-250 ° C; the residence time is 1.5 min, the main engine speed is 440 r / min, and the pressure value is 16Mpa;

[0103] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0104] S5. Cool and dry;

[0105] S6. Pelletizing;

[0106] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 95 ± 5°C.

[0107] That is, the same as Example 2, except that the ratio of the acrylonitrile-styrene-butadiene copolymer in S1 is adjusted.

[0108] Example 6

[0109] A method for preparing a USBC sheet material is prepared according to the following steps:

[0110] S1. Weigh 59% polycarbonate, 10% acrylonitrile-styrene-butadiene copolymer, 2% methyl methacrylate-butadiene-styrene copolymer, 15% hardness modifier, 0.3% antioxidant, 0.2% lubricant, 0.5% inhibitor and 3% compatibilizer in a high-speed mixer and mix well;

[0111] S2 is placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 240 ° C, the temperature of zone 2 is 250 ° C, the temperature of zone 3 is 250-260 ° C, the temperature of zone 4 is 260 ° C, the temperature of zone 5 is 250 ° C, the temperature of zone 6 is 250 ° C, the temperature of zone 7 is 250 ° C, the temperature of zone 8 is 250 ° C, the temperature of zone 9 is 250 ° C, and the die temperature is 240-250 ° C; the residence time is 1.5 min, the main engine speed is 440 r / min, and the pressure value is 16Mpa;

[0112] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0113] S5. Cool and dry;

[0114] S6. Pelletizing;

[0115] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 95 ± 5°C.

[0116] That is, the same as Example 2, except that the proportion of polycarbonate in S1 is adjusted.

[0117] Example 7

[0118] A method for preparing a USBC sheet material is prepared according to the following steps:

[0119] S1. Weigh 39% polycarbonate, 30% acrylonitrile-styrene-butadiene copolymer, 2% methyl methacrylate-butadiene-styrene copolymer, 15% hardness modifier, 0.3% antioxidant, 0.2% lubricant, 0.5% inhibitor and 3% compatibilizer in a high-speed mixer and mix well;

[0120] S2 is placed in a twin-screw extruder, and the heating zone temperature and the die temperature are set; wherein the temperature of zone 1 is 240 ° C, the temperature of zone 2 is 250 ° C, the temperature of zone 3 is 250-260 ° C, the temperature of zone 4 is 260 ° C, the temperature of zone 5 is 250 ° C, the temperature of zone 6 is 250 ° C, the temperature of zone 7 is 250 ° C, the temperature of zone 8 is 250 ° C, the temperature of zone 9 is 250 ° C, and the die temperature is 240-250 ° C; the residence time is 1.5 min, the main engine speed is 440 r / min, and the pressure value is 16Mpa;

[0121] S3. Extruding the material through a twin-screw extruder to obtain modified PC / ABS;

[0122] S5. Cool and dry;

[0123] S6. Pelletizing;

[0124] S7. Place it in a preset mold for injection molding to obtain a USBC sheet; wherein the injection molding temperature is 230-250°C and the mold temperature is 95 ± 5°C.

[0125] That is, the same as Example 3, except that the proportion of polycarbonate in S1 is adjusted.

[0126] In Examples 1 to 7, the weight ratio of polycarbonate or acrylonitrile-styrene-butadiene copolymer is adjusted respectively. Compared with the prior art, the USBC sheet prepared by adding polycarbonate and acrylonitrile-styrene-butadiene copolymer in the present application is less prone to deformation, has stable dimensions, and is more durable.

[0127] Table 1 shows the dimensional change data of PA and modified PC / ABS after water absorption:

[0128]

[0129] As shown in Table 1, it is a data chart of water absorption size change of a sheet made of PA (nylon) and a sheet made of the modified PC / ABS material prepared in the present application. It can be seen from Table 1 that after 25 days, the water absorption rate of the sheet made of PA is much higher than that of the modified PC / ABS material. It can be seen that the size of the sheet made of the modified PC / ABS material of the present application is more stable, not easy to deform due to water absorption, more durable, and has more advantages in actual production applications.

[0130] In summary, compared with the existing technology, the modified PC / ABS material not only has better fluidity, better toughness and higher strength, but also has good water absorption, crystallization and deformation properties. The obtained sheet has stable dimensions, is more durable, has lower water absorption and internal stress, is not easy to crystallize and deform, and the product quality is greatly improved.

[0131] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thin sheet material used in USBC, characterized in that: The following ingredients and weight percentages composition: Polycarbonate: 20-60%; Acrylonitrile-styrene-butadiene copolymer: 10-50%; Methyl methacrylate-butadiene-styrene copolymer: 1-20%; Hardness modifier: 5-50%; Antioxidant: 0.1-0.8%; Lubricant: 0.1-5.0%; Inhibitor: 0.1-1.0%; Compatibilizer: 1-20%.

2. The USBC sheet material according to claim 1, characterized in that: The polycarbonate is 20000-45000 g / mol bisphenol A type aromatic polycarbonate.

3. The USBC sheet material according to claim 1, characterized in that: The weight percentage of the acrylonitrile-styrene-butadiene copolymer is: Styrene content 35-65%; Acrylonitrile content 15-55%; Butadiene content 15-50%; The acrylonitrile-styrene-butadiene copolymer is synthesized by emulsion polymerization or bulk polymerization according to the above weight percentage.

4. The USBC sheet material according to claim 1, characterized in that: In the methyl methacrylate-butadiene-styrene copolymer, the ratio of methyl methacrylate:butadiene:styrene is 1:2:1; The methyl methacrylate-butadiene-styrene copolymer is synthesized by emulsion polymerization according to the above ratio.

5. The USBC sheet material according to claim 1, characterized in that: The hardness modifier includes triphenyl phosphate, diphenyl phosphate, silicone, polyurethane and montan wax, and the ratio of triphenyl phosphate: diphenyl phosphate: silicone: polyurethane: montan wax is 5:5:5:5:

2.

6. The USBC sheet material according to claim 1, characterized in that: The antioxidants include primary antioxidants and auxiliary antioxidants; The lubricant is ethylene bisstearamide; The inhibitor is an alkyl phosphate.

7. The USBC sheet material according to claim 1, characterized in that: The compatibilizer is ethylene-methyl acrylate.

8. A method for preparing a USBC sheet material, characterized in that: The USBC sheet material according to any one of claims 1 to 7 is prepared according to the following steps: S1, weighing the polycarbonate, the acrylonitrile-styrene-butadiene copolymer, the methyl methacrylate-butadiene-styrene copolymer, the hardness modifier, the antioxidant, the lubricant, the inhibitor and the compatibilizer according to weight ratio; S2, mixing the polycarbonate, acrylonitrile-styrene-butadiene copolymer, methyl methacrylate-butadiene-styrene copolymer, hardness modifier, antioxidant, lubricant, inhibitor and compatibilizer uniformly, placing the mixture in a preset twin-screw extruder, and setting the heating zone temperature, die head temperature and residence time; S3, discharging the material through the twin-screw extruder to obtain modified PC / ABS; S4, cooling; S5, dry; S6, pelleting; S7, placing it in a preset mold for injection molding to obtain a USBC sheet.

9. A USBC sheet, characterized in that: The material is prepared by the preparation method for USBC sheet material as described in claim 8.

10. A device applied to USBC sheet material, characterized in that: It comprises a twin-screw extruder, a feed port, a die head and a mold, wherein the feed port and the die head are respectively arranged on the twin-screw extruder, and the die head is arranged toward the mold; A plurality of heating areas are arranged between the feed port and the die head. The material enters from the feed port, flows through the plurality of heating areas in sequence, and is discharged from the die head.

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