PC / PS alloy material and preparation method and application thereof

Abstract

The invention discloses a PC / PS alloy material and a preparation method and application thereof. The PC / PS alloy material comprises the following components in parts by weight: 28-62 parts of polycarbonate; 3 to 57 parts of polystyrene; 10 to 40 parts of a compatilizer; 5 to 15 parts of glass fiber; the compatilizer is a mixture of styrene-maleic anhydride copolymer and K glue, and the mass ratio of the styrene-maleic anhydride copolymer to the K glue is (0.1-5): 1. According to the invention, polystyrene and polycarbonate are adopted as matrix resin, and the mixture of styrene-maleic anhydride copolymer and K glue is added as the compatilizer, so that the appearance performance and impact performance of the alloy material can be effectively improved, and the alloy material has good fluidity.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic modification, and more specifically, relates to a PC / PS alloy material and a preparation method and application thereof. Background Art

[0002] Polycarbonate (PC) is a high molecular polymer containing carbonate groups in its molecular chain. It has good impact resistance, flame retardancy and is colorless and transparent. However, its price and formability limit its application.

[0003] Polystyrene (PS) refers to a polymer synthesized from styrene monomers by free radical addition polymerization. It is a colorless, transparent thermoplastic with good thermal insulation, electrical insulation and transparency, but it is brittle and prone to cracking at low temperatures.

[0004] However, the compatibility of PC and PS is poor, resulting in poor appearance and mechanical properties of their alloy materials, which affects their application. Most of the front frame materials of home TVs are reinforced materials, and a narrow front frame is needed to protect the display screen. Since the appearance of the product is a high requirement, as the frame is getting narrower and narrower, the size of the TV is getting larger and larger, the fluidity requirements of the material are also getting higher and higher, and the melt flow rate is usually required to be not less than 18g / 10min; although the use of ordinary compatibilizers can improve the compatibility of the two to a certain extent, the addition of pearlescent powder will cause the transparency of the material to decrease due to the addition of conventional compatibilizers, and the transparent effect cannot be achieved, and the appearance effect is poor. Summary of the invention

[0005] The purpose of the present invention is to provide a PC / PS alloy material to overcome the defects or shortcomings of the prior art PC / PS alloy material, such as poor compatibility, poor appearance of the alloy material, and mechanical properties that cannot meet the requirements.

[0006] Another object of the present invention is to provide a method for preparing the PC / PS alloy material.

[0007] Another object of the present invention is to provide applications of the PC / PS alloy material.

[0008] To achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A PC / PS alloy material comprises the following components calculated in parts by weight:

[0010]

[0011] The compatibilizer is a mixture of styrene-maleic anhydride copolymer and K glue, and the mass ratio of the styrene-maleic anhydride copolymer to the K glue is (0.1-5):1.

[0012] In the present invention, by adopting polycarbonate and polystyrene as matrix resins, selecting styrene-maleic anhydride copolymer and K glue compound as compatibilizers, and adjusting the ratio of the two, an alloy material with both good appearance performance and impact performance can be obtained; wherein the styrene-maleic anhydride copolymer has good compatibility with the matrix resin, and cooperates with the styrene chain segment in the K glue to further improve the impact performance of the system, so that the alloy material has good appearance and impact performance, and better fluidity.

[0013] It should be noted that, in the PC / PS alloy material of the present invention, the mass content of polycarbonate is preferably not less than 20wt%.

[0014] It should be noted that the mass ratio of the styrene-maleic anhydride copolymer and the K glue in the present invention is (0.1-5):1, specifically 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9: 1, 2:1, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1, 3:1, 3.2:1, 3.5:1, 3.8:1, 4:1, 4.2:1, 4.5:1, 4.8:1 or 5:1, etc., as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention will no longer exhaustively list the specific point values ​​included in the said range.

[0015] Furthermore, the mass ratio of styrene-maleic anhydride copolymer to K glue is (0.2-1.5):1.

[0016] It should be noted that the K glue in the present invention is a binary copolymer obtained by copolymerization of styrene and butadiene.

[0017] Furthermore, the styrene content in the K glue is 70-90wt%.

[0018] Furthermore, the styrene content in the K glue is 70-80wt%.

[0019] Specifically, the styrene content is measured by infrared spectroscopy. The benzene ring of styrene will show a specific absorption peak in the infrared spectrum (such as 1600cm -1 By comparing with the standard sample, the styrene content can be quantitatively analyzed.

[0020] Furthermore, the polycarbonate has a melt flow rate of 1 to 50 g / 10 min at 300° C. and a load of 1.2 kg as tested in accordance with ISO 1133-1-2022.

[0021] Furthermore, the polystyrene has a melt flow rate of 1 to 50 g / 10 min at 200° C. and a load of 5 kg as tested in accordance with ISO 1133-1-2022.

[0022] Furthermore, the polystyrene has a melt flow rate of 2 to 20 g / 10 min at 200° C. and a load of 5 kg as tested according to ISO 1133-1-2022.

[0023] Specifically, the refractive index of the polycarbonate is 1.5 to 1.65.

[0024] Specifically, the refractive index of the polystyrene is 1.5 to 1.65.

[0025] Furthermore, the maleic anhydride content in the styrene-maleic anhydride copolymer is 16-20wt%.

[0026] Specifically, the method for determining the maleic anhydride content is an acid-base titration method.

[0027] Furthermore, the PC / PS alloy material further comprises 1 to 5 parts of pearlescent powder. Adding pearlescent powder to the PC / PS alloy material can make the PC / PS alloy material have a pearlescent effect without reducing the transparency, and the PC / PS alloy material is transparent.

[0028] Furthermore, the pearlescent powder includes mica-coated pearlescent powder and / or silica-coated pearlescent powder.

[0029] Specifically, the particle size distribution of the pearlescent powder is 5 to 500 μm.

[0030] Specifically, the retention length of the glass fiber is 0.3-0.8 mm.

[0031] Specifically, the retained length of the glass fiber is obtained by calcining the alloy material in a muffle furnace at 600° C. for 2 hours to obtain a glass fiber residue, and then using a two-dimensional image measuring instrument to perform sampling detection on the glass fiber length, testing 3 samples in each group and taking the average value.

[0032] Furthermore, the PC / PS alloy material comprises the following components calculated in parts by weight:

[0033]

[0034] Furthermore, 0.1 to 5 parts of auxiliary agents are included.

[0035] Specifically, the auxiliary agent includes one or more of an antioxidant, a lubricant or a weathering agent.

[0036] In the present invention, commonly used antioxidants may be selected with reference to the prior art, such as but not limited to hindered phenol antioxidants and / or phosphite antioxidants.

[0037] Specifically, the hindered phenol antioxidant is one or more of N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide) (Irganox 1098), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (Irganox 1010), 1,6-hexanediol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (Irganox 259), β-(4-hydroxy-3,5-di-tert-butylphenyl)propionic acid n-octadecyl (Irganox 1076) or 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)acrylate]-1,1-dimethyl}-2,4,8,10-tetraoxaspirocycloundecane (ADK AO-80).

[0038] The phosphite antioxidant is one or more of tris(2,4-di-tert-butylphenyl)phosphite (Irganox 168), bis(2,6-di-tert-butyl-4-tolyl) pentaerythritol phosphite (PEP-36) or 627A.

[0039] In the present invention, commonly used lubricants can be selected with reference to the prior art, such as but not limited to one or more of pentaerythritol tetrastearate, vinyl bisstearamide, polysiloxane, calcium stearate, magnesium stearate, zinc stearate, PE wax, or PP wax.

[0040] In the present invention, commonly used weathering agents can be selected according to the prior art, such as but not limited to hindered amine light stabilizers and benzotriazole ultraviolet light absorbers.

[0041] Specifically, the hindered amine light stabilizer is at least one of bis-2,2,6,6-tetramethylpiperidinol sebacate, a polymer of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine.

[0042] Specifically, the benzotriazole ultraviolet light absorber is one or more of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole (UV-P), 2-(2'-hydroxy-3',5'bis(a,a-dimethylbenzyl)phenyl)benzotriazole (UV-234), and 2-(-hydroxy-3-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole (UV-236).

[0043] The present invention also provides a method for preparing the above PC / PS alloy material, comprising the following steps:

[0044] The components are mixed evenly according to the proportion, and fed into the extruder for extrusion and granulation to obtain the PC / PS alloy material.

[0045] Specifically, the extruder is a twin-screw extruder, and the extrusion temperature is 180-250°C.

[0046] In some specific embodiments, the temperature of the twin-screw extruder is as follows: the temperature of zones 1 to 2 is 210-240°C, the temperature of zones 3 to 5 is 220-245°C, and the temperature of zones 6 to 10 is 230-260°C.

[0047] The present invention also protects the application of the above PC / PS alloy material in the preparation of household appliance structural parts, and is particularly suitable for decorative strip materials in the household appliance industry, such as TV front frame materials, refrigerator decorative strips or washing machine decorative strips.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The invention provides a PC / PS alloy material. By selecting a styrene-maleic anhydride copolymer and a K-glue mixture as a compatibilizer and adjusting the mass ratio of the two, an alloy material with good appearance performance and impact performance and high fluidity can be obtained. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with specific examples, which are only used to explain the present invention and are not used to limit the scope of the present invention. The test methods used in the following examples are conventional methods unless otherwise specified; the materials and reagents used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0051] 1. Raw materials used in each embodiment and comparative example:

[0052] Polycarbonate:

[0053] PC 1: PC1300 10NP, melt flow rate of 10 g / 10 min at 300 °C and 1.2 kg load according to ISO 1133-1-2022, purchased from LG;

[0054] PC 2: PC H-2000V, with a melt flow rate of 22 g / 10 min at 300°C and 1.2 kg load as tested in accordance with ISO 1133-1-2022, purchased from Mitsubishi Engineering-Plastics Corporation;

[0055] Polystyrene:

[0056] PS1: 818K, melt flow rate of 2.3 g / 10 min at 200 °C and 5 kg load according to ISO 1133-1-2022, purchased from Delta;

[0057] PS2: GPPS123P, melt flow rate 8 g / 10 min at 200 °C and 5 kg load according to ISO 1133-1-2022, purchased from SECCO;

[0058] Compatibilizer:

[0059] Styrene-maleic anhydride copolymer 1: SMA700, maleic anhydride grafting rate 18wt%, purchased from Huawen Chemical;

[0060] Styrene-maleic anhydride copolymer 2: SZ 23110, maleic anhydride grafting rate of 23 wt%, purchased from Polyscope;

[0061] Styrene-maleic anhydride copolymer 3: SMA725, maleic anhydride grafting rate 25wt%, purchased from Huawen Chemical;

[0062] Styrene and butadiene block copolymer: Globalprene 1487, purchased from Lee Chang Jung Group.

[0063] K glue:

[0064] K glue 1: KR03, with a measured styrene content of 75 wt%, purchased from Philips Korea;

[0065] K glue 2: KR05, with a measured styrene content of 85 wt%, purchased from Philips Korea;

[0066] K glue 3: K glue 8036, with a measured styrene content of 70 wt%, was purchased from Guangdong Zhonghe.

[0067] Fiberglass:

[0068] Glass fiber 1: MF7904, purchased from LANXESS;

[0069] Glass fiber 2: ECS13-4.5-510H, purchased from Jushi;

[0070] Wollastonite, HQ-1250, was purchased from Dalian Global Minerals Co., Ltd.;

[0071] Pearlescent powder:

[0072] Pearlescent powder 1: Silica-coated pearlescent powder, CJ7310, diamond gold, particle size distribution of 100-300 μm, purchased from Guangzhou Changjin New Materials Technology Co., Ltd.;

[0073] Pearlescent powder 2: mica coated pearlescent powder, pearlescent powder 1151, pearlescent silvery white, particle size distribution of 30-100 μm, purchased from Kunshan Zhongxing;

[0074] Additives:

[0075] Antioxidant: a compound of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0076] Lubricant: pentaerythritol tetrastearate;

[0077] The additives are all commercially available;

[0078] The same raw materials were used in the parallel experiments of the embodiments and comparative examples.

[0079] 2. The PC / PS alloy materials described in each embodiment and comparative example are prepared by the following method according to the formula in Tables 1 to 2, comprising the following steps:

[0080] The components are mixed evenly according to a proportion, fed into a twin-screw extruder and extruded and granulated to obtain a PC / PS alloy material; wherein the extrusion temperature is: the temperature of zones 1 to 2 is 240°C, the temperature of zones 3 to 5 is 245°C, and the temperature of zones 6 to 10 is 255°C.

[0081] 3. Performance test:

[0082] (1) Notched impact performance test: The impact performance of the PC / PS alloy materials prepared in each embodiment and comparative example was measured according to ISO180-2019 standard, notch type A;

[0083] (2) Appearance test: The PC / PS alloy materials prepared in each embodiment and comparative example were rated according to the following standards:

[0084] Grade A: Injection mold a 100mm*100mm*2mm square plate and observe the appearance. If there is an obvious pearlescent glittering effect and the outline of the pearlescent powder can be clearly seen, it is evaluated as Grade A;

[0085] Grade B: Injection mold a 100mm*100mm*2mm square plate and observe the appearance. If there is an obvious pearlescent glittering effect, but the outline of the pearlescent powder cannot be clearly seen, it is evaluated as Grade B;

[0086] Grade C: Injection molded square plates of 100mm*100mm*2mm, observe the appearance, and if there is a weak pearlescent effect, it will be evaluated as Grade C;

[0087] Grade D: Injection mold a 100mm*100mm*2mm square plate, observe the appearance, and if there is no pearlescent effect, it will be evaluated as Grade D.

[0088] (3) Flowability test: The PC / PS alloy materials prepared in each embodiment and comparative example were tested for flowability according to standard ISO ISO 1133-1:2022 (260° C., 5 kg).

[0089] Examples 1 to 14 and Comparative Examples 1 to 4

[0090] Table 1 Amount (unit: weight parts) and properties of each component in the PC / PS alloy material in Examples 1 to 12

[0091]

[0092]

[0093] Table 2 Amount (unit: weight parts) and properties of each component in the PC / PS alloy material in Examples 12 to 14 and Comparative Examples 1 to 4

[0094]

[0095] It can be seen from the table that the PC / PS alloy materials prepared in various embodiments of the present invention have good appearance performance and mechanical properties, and good fluidity. Specifically, the melt flow rate is not less than 18g / 10min; the appearance is not less than Class B, and the impact performance is not less than 7kJ / m 2 .

[0096] It can be seen from Comparative Examples 1 and 2 that if the mass ratio of styrene-maleic anhydride copolymer to K glue in the used compatibilizer is outside the range, the obtained PC / PS alloy material cannot have both good appearance performance and impact performance.

[0097] It can be seen from Comparative Example 3 that if other substances such as styrene and butadiene block copolymer elastomer SBS are compounded with styrene-maleic anhydride copolymer, the comprehensive performance of the obtained alloy material decreases.

[0098] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A PC / PS alloy material, characterized in that: The composition comprises the following components calculated by weight: The compatibilizer is a mixture of styrene-maleic anhydride copolymer and K glue, and the mass ratio of the styrene-maleic anhydride copolymer to the K glue is (0.1-5):

1.

2. The PC / PS alloy material according to claim 1, characterized in that: The styrene content in the K glue is 70-90wt%.

3. The PC / PS alloy material according to claim 1, characterized in that: The polycarbonate has a melt flow rate of 1 to 50 g / 10 min at 300° C. and a load of 1.2 kg as tested according to ISO 1133-1-2022.

4. The PC / PS alloy material according to claim 1, characterized in that: The polystyrene has a melt flow rate of 1 to 50 g / 10 min at 200° C. and a load of 5 kg as tested according to ISO 1133-1-2022.

5. The PC / PS alloy material according to claim 1, characterized in that: The retention length of the glass fiber is 0.3-0.8 mm.

6. The PC / PS alloy material according to claim 1, characterized in that: The mass ratio of the styrene-maleic anhydride copolymer to the K glue is (0.2-1.5):

1.

7. The PC / PS alloy material according to claim 1, characterized in that: It also includes 1 to 5 parts of pearlescent powder; preferably, the pearlescent powder includes mica-coated pearlescent powder and / or silica-coated pearlescent powder.

8. The PC / PS alloy material according to claim 1, characterized in that: It also includes 0.1 to 5 parts of auxiliary agents.

9. A method for preparing the PC / PS alloy material according to any one of claims 1 to 8, characterized in that: The steps include: The components are mixed evenly according to the proportion, and fed into the extruder for extrusion and granulation to obtain the PC / PS alloy material.

10. Use of the PC / PS alloy material according to any one of claims 1 to 8 in the preparation of household appliance structural parts.

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