A high-performance antistatic SAS-PA composition and its preparation method and application

Abstract

The present invention discloses a high-performance antistatic SAS-PA composition, a preparation method and an application thereof. The SAS-PA composition comprises the following components: 20 to 50 parts of SAS resin; 20 to 40 parts of PA resin; 20 to 40 parts of carbon fiber; 5 to 15 parts of antistatic agent; 2 to 8 parts of compatibilizer; wherein the relative viscosity of the PA resin is 2.3 to 3.0. In the present invention, by using SAS resin and PA resin as a matrix, adding carbon fiber and a small amount of antistatic agent, and adjusting the relative viscosity of the PA resin, the SAS-PA composition has good antistatic properties and mechanical properties, with a tensile strength of not less than 200MPa and a notched impact strength of not less than 10kJ / m 2 , bending fatigue life is not less than 48,000 times, surface resistance is not higher than 1*10 9 Ω.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering plastics, and particularly relates to a high-performance antistatic SAS-PA composition, a preparation method and an application thereof. Background Art

[0002] Drones typically use metal for their structural parts, but metal is heavy and will affect the drone's range, so plastics such as ABS are used for their outer shells. However, plastics such as ABS have low rigidity and fatigue resistance, and cannot meet the rigidity requirements of continuous flight and the fatigue resistance requirements of high-speed propeller operation. The variable-speed welding components in drones require low resistance, and ordinary plastics cannot meet these requirements either.

[0003] Polyamide resin (PA resin) is a crystalline polymer with excellent mechanical properties, a low surface friction coefficient, outstanding wear resistance, and good alkali resistance. However, it is also a poor conductor of electricity and easily accumulates static charge during processing and use. When static charge accumulates to a certain level, it can cause the material to absorb dust and damage it. It can also generate static spark discharges, causing explosions and fires in chemical product warehouses, resulting in serious personal injuries. Therefore, there is a need in the art to develop a composition that exhibits excellent antistatic properties while also possessing good toughness, rigidity, and fatigue resistance. Summary of the Invention

[0004] The purpose of the present invention is to overcome the technical problems in the prior art that SAS-PA compositions have poor antistatic properties and cannot have both good toughness and rigidity, and to provide a high-performance antistatic SAS-PA composition.

[0005] Another object of the present invention is to provide a method for preparing the high-performance antistatic SAS-PA composition.

[0006] Another object of the present invention is to provide an application of the high-performance antistatic SAS-PA composition.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A high-performance antistatic SAS-PA composition comprises the following components calculated in parts by weight:

[0009] 20-50 parts of SAS resin;

[0010] 20-40 parts of PA resin;

[0011] 20-40 parts of carbon fiber;

[0012] 5-15 parts of antistatic agent;

[0013] 2 to 8 parts of compatibilizer;

[0014] Wherein, the relative viscosity of the PA resin is 2.3-3.0.

[0015] The inventors discovered in their research that a large amount of antistatic agent needs to be added to make the SAS-PA composition have good antistatic properties. However, a large amount of antistatic agent will result in poor mechanical properties of the composition. In the present invention, by using SAS resin and PA resin as a matrix, adding carbon fiber and a small amount of antistatic agent, and adjusting the relative viscosity of the PA resin, the SAS-PA composition has good antistatic and mechanical properties. Adjusting the relative viscosity of the PA resin can form a good interpenetrating network structure, which is superimposed on the conductive effect of the carbon fiber. Good antistatic properties can be obtained with a small amount of antistatic agent added, while improving the rigidity and toughness of the composition.

[0016] In the present invention, the relative viscosity of the PA resin is 2.3 to 3.0, for example, but not limited to 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 and 3.0, etc. can all achieve the present invention.

[0017] In a specific embodiment, the relative viscosity of the PA resin is 2.4 to 2.8.

[0018] Furthermore, the relative viscosity of the PA resin is measured according to the GB / T 38138-2019 test method.

[0019] It should be noted that the PA resin in the present invention may be a semi-aromatic polyamide and / or an aliphatic polyamide.

[0020] Specifically, the semi-aromatic polyamide is selected from one or more of PA6T / 66, PA6I, PA6T / 6I, PA6T / M5T, PA9T, PA9T / 66, PA10T, PA10T / 66, PA10T / 10I, PA10T / 1010, PA12T, and PA12I.

[0021] The aliphatic polyamide is selected from one or more of PA6, PA66, PA610, PA612, PA1010, PA1012, PA1212, PA11, and PA12.

[0022] It should be noted that, in the high-performance antistatic SAS-PA composition of the present invention, the PA resin content is not less than 12 wt %.

[0023] Furthermore, the mass ratio of the carbon fiber to the antistatic agent is (2-5): 1. By adjusting the mass ratio of the carbon fiber to the antistatic agent within this range, the high-performance antistatic SAS-PA composition can have better tensile strength and notched impact performance while ensuring antistatic performance.

[0024] Furthermore, the mass ratio of the PA resin to the carbon fiber is (0.5-2):1.

[0025] Furthermore, the high-performance antistatic SAS-PA composition comprises the following components calculated in parts by weight:

[0026] 20-30 parts of SAS resin;

[0027] 30-40 parts of PA resin;

[0028] 28-32 parts of carbon fiber;

[0029] 8-12 parts of antistatic agent;

[0030] 5-7 parts of compatibilizer;

[0031] 0.2 to 6 parts of toughening agent;

[0032] 0.1-0.3 parts of coupling agent;

[0033] 0.1 to 2 parts of processing aid.

[0034] In the present invention, there is no special requirement for the melt flow rate of the SAS resin. In a specific embodiment, the melt flow rate of the SAS resin at 220°C and 10 kg load is 2 to 15 cm 3 / 10min, for example but not limited to 2cm 3 / 10min、3cm 3 / 10min、4cm 3 / 10min、5cm 3 / 10min、6cm 3 / 10min、7cm 3 / 10min、8cm 3 / 10min、9cm 3 / 10min、10cm 3 / 10min、11cm 3 / 10min、12cm 3 / 10min、13cm 3 / 10min、14cm 3 / 10min and 15cm 3 / 10min etc. can all achieve the requirements of the present invention.

[0035] Furthermore, the melt flow rate is measured according to ISO-1133-1-2011.

[0036] Specifically, the content of acrylonitrile in the SAS resin is 15 to 35 wt%.

[0037] Furthermore, the aspect ratio of the carbon fiber is (300-1500):1.

[0038] Furthermore, the aspect ratio of the carbon fiber is (500-1400):1.

[0039] Specifically, the diameter of the carbon fiber is 3 to 13 μm.

[0040] Furthermore, the antistatic agent is a polyetheramide antistatic agent and / or a polyether olefin antistatic agent. Such antistatic agents have better compatibility with PA resin, which can improve the overall performance of the prepared SAS-PA composition.

[0041] Furthermore, the compatibilizer is at least one of styrene-N-phenylmaleimide-maleic anhydride copolymer or styrene-acrylonitrile-glycidyl methacrylate copolymer.

[0042] In the present invention, a commonly used toughening agent can be selected according to the prior art, for example, but not limited to, the toughening agent is at least one of methyl methacrylate-butadiene-styrene terpolymer or ABS high rubber powder.

[0043] Furthermore, the coupling agent is at least one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent or a zirconate coupling agent.

[0044] Furthermore, the processing aid is an antioxidant and / or a lubricant.

[0045] In the present invention, commonly used antioxidants can be selected according to existing technologies, such as but not limited to at least one of hindered phenol antioxidants, phosphite antioxidants or thioester antioxidants.

[0046] 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).

[0047] The phosphite antioxidant is one or more of tris(2,4-di-tert-butylphenyl)phosphite (Irganox 168), bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol phosphite (PEP-36) or 627A.

[0048] The thioester antioxidant is one or more of distearyl thiodipropionate, dilauryl thiodipropionate or pentaerythritol dodecylthiopropionate.

[0049] In the present invention, commonly used lubricants can be selected according to the prior art, such as but not limited to one or more of vinyl bisstearamide, polysiloxane, calcium stearate, magnesium stearate, zinc stearate or PE wax.

[0050] The present invention also provides a method for preparing the high-performance antistatic SAS-PA composition, comprising the following steps:

[0051] S1. The remaining raw materials except the carbon fiber are mixed to obtain a premix;

[0052] S2. The premix in S1 is fed into the extruder through the main feed port, and the carbon fiber is fed through the side feed port. The high-performance antistatic SAS-PA composition is obtained by melt blending and extrusion granulation.

[0053] Furthermore, in step S2, the extruder is a twin-screw extruder.

[0054] Furthermore, the temperature of the twin-screw extruder is 180-260° C.; the aspect ratio of the twin-screw extruder is 36-48, and the screw speed is 300-800 rpm.

[0055] The present invention also provides the use of the high-performance antistatic SAS-PA composition in the preparation of UAV materials.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] The present invention provides a high-performance antistatic SAS-PA composition. SAS resin and PA resin are used as matrix resins, carbon fibers are added, and the relative viscosity of the PA resin is adjusted to form a good interpenetrating network structure. The structure can be superimposed with the conductive effect of the carbon fibers, thereby achieving good antistatic performance with a relatively small amount of antistatic agent added, while also enabling the composition to have good mechanical properties and fatigue resistance. DETAILED DESCRIPTION

[0058] The present invention is further described in detail below with reference to specific examples. The examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods used in the following examples are conventional methods unless otherwise specified; the materials and reagents used are commercially available reagents and materials unless otherwise specified.

[0059] The raw materials used in each embodiment and comparative example are:

[0060] SAS resin:

[0061] SAS resin 1: TW15G, melt flow rate at 220℃, 10kg load is 3cm 3 / 10min, acrylonitrile content 30wt%; purchased from Japan UMG;

[0062] SAS resin 2: E259B, melt flow rate at 220°C, 10 kg load: 15 cm 3 / 10min, acrylonitrile content 17wt%, purchased from UMG, Japan;

[0063] ABS resin: ABS PA-757, melt flow rate of 19 g / 10 min at 220 ° C and 10 kg load, purchased from Chi Mei, Taiwan, China;

[0064] PA resin:

[0065] PA resin 1: PA6, HY2500A, relative viscosity 2.45, purchased from Haiyang, Jiangsu;

[0066] PA resin 2: PA6, HY2800A, relative viscosity 2.8, purchased from Haiyang, Jiangsu;

[0067] PA resin 3: PA6, HY2000A, relative viscosity 2.0, purchased from Haiyang, Jiangsu;

[0068] PA resin 4: PA6, HY3400A, relative viscosity 3.4, purchased from Haiyang, Jiangsu;

[0069] PA resin 5: PA66, PA66 EPR24, relative viscosity 2.45, purchased from Shenma Industrial;

[0070] Carbon Fiber:

[0071] Carbon fiber 1: MYT80-PA, aspect ratio 1400:1, diameter 5 μm, purchased from Shanghai Muyun New Material Technology Co., Ltd.

[0072] Carbon fiber 2: K223SE, aspect ratio 500:1, diameter 11 μm, purchased from Mitsubishi Chemical, Japan;

[0073] Carbon fiber 3: IMC / CFC-MLD300, aspect ratio 50:1, diameter 7 μm, purchased from PROCOTEX, France;

[0074] Glass fiber: ECS10-4.5-534AKF, aspect ratio 450:1, diameter 10 μm, purchased from Jushi Group Co., Ltd.

[0075] Antistatic agent: polyetheramide antistatic agent, PELESTAT-6500, purchased from Sanyo Chemical;

[0076] Compatibilizer:

[0077] Compatibilizer 1: styrene-N-phenylmaleimide-maleic anhydride copolymer, MS-NB, purchased from Nippon Denki Kagaku Kogyo Co., Ltd.;

[0078] Compatibilizer 2: styrene-acrylonitrile-glycidyl methacrylate copolymer, SAG-008, purchased from Jiayirong Compatibilizer Jiangsu Co., Ltd.;

[0079] Toughening agent: methyl methacrylate-butadiene-styrene terpolymer, EM500, purchased from LG Chemical, South Korea;

[0080] Coupling agent: bisamino-modified siloxane, FD-7270, purchased from Zhejiang Feidian Chemical Co., Ltd.;

[0081] Processing aids:

[0082] Antioxidant: a mixture of hindered phenol antioxidant and phosphite antioxidant in a weight ratio of 1:1, commercially available;

[0083] Lubricant: vinyl bisstearamide, commercially available; the same processing aid was used in the parallel experiments of Examples 1 to 15 and Comparative Examples 1 to 8.

[0084] Examples 1 to 15 and Comparative Examples 1 to 8

[0085] In the examples and comparative examples, the high-performance antistatic SAS-PA composition was prepared according to the formulations in Tables 1 to 3 by the following method, comprising the following steps:

[0086] S1. The SAS resin, PA resin, antistatic agent, toughening agent, compatibilizer, coupling agent and processing aid were mixed to obtain a premix;

[0087] S2. The premix in S1 is fed into a twin-screw extruder through the main feed port, and the carbon fiber is fed into the twin-screw extruder through the side feed port. A high-performance antistatic SAS-PA composition is obtained by melt blending and extrusion granulation; the temperature of the twin-screw extruder is 180-230°C; the aspect ratio of the twin-screw extruder is 25-40, and the screw speed is 300-800 rpm.

[0088] Table 1 Amount of each component in the high performance antistatic SAS-PA composition in Examples 1 to 7 (Unit: parts by weight)

[0089]

[0090] Table 2 Amount of each component in the high performance antistatic SAS-PA composition in Examples 8 to 15 (Unit: parts by weight)

[0091]

[0092] Table 3 Amount of each component in the SAS-PA composition in Comparative Examples 1 to 8 (Unit: parts by weight)

[0093]

[0094] Performance Testing

[0095] The performance of the SAS-PA compositions prepared in the above examples and comparative examples was tested, and the specific test items and test methods are as follows:

[0096] 1. Test Method

[0097] (1) Bending strength test: The SAS-PA compositions prepared in the examples and comparative examples were tested according to ISO 178-2019 standard at a bending rate of 2 mm / min.

[0098] (2) Notched impact strength test: The SAS-PA compositions of the examples and comparative examples were tested according to ISO 180-2019, with the notched type being type A.

[0099] (3) Bending fatigue performance test: The SAS-PA compositions prepared in the examples and comparative examples were tested according to the JB / T6543-93 standard, with an alternating cycle frequency of 25 Hz and a limiting load of 60% of the maximum stress;

[0100] (4) Antistatic performance test: The SAS-PA compositions prepared in the examples and comparative examples were tested according to the IEC60093 standard after being placed at 23°C and 50% humidity for 24 hours.

[0101] 2. Test results

[0102] The test results of the embodiments and comparative examples are shown in Table 4.

[0103] Table 4 Test results of various embodiments and comparative examples

[0104]

[0105] As can be seen from Table 4, the high-performance antistatic SAS-PA composition prepared in the present invention has good antistatic properties, as well as good rigidity and toughness. Specifically, the tensile strength is not less than 200 MPa, and the notched impact strength is not less than 10 kJ / m 2 , bending fatigue life is not less than 48,000 times, surface resistance is not higher than 1*10 9 Ω.

[0106] It can be seen from Example 1 and Examples 3 to 4 that as the amount of antistatic agent increases and the amount of carbon fiber decreases, the tensile strength of the obtained high-performance antistatic SAS-PA composition gradually decreases, the notched impact performance first increases and then decreases, and the antistatic performance gradually increases. When the mass ratio of carbon fiber to antistatic agent is (2 to 5): 1, the comprehensive performance of the obtained composition is better.

[0107] It can be seen from Example 1 and Examples 6 to 7 that as the amount of the compatibilizer increases, the comprehensive performance of the obtained high-performance antistatic SAS-PA composition is better.

[0108] It can be seen from Examples 8 to 10 that as the weight ratio of PA resin to carbon fiber increases, the tensile strength and notched impact of the prepared high-performance antistatic SAS-PA composition first increase and then decrease, and the surface resistance gradually increases.

[0109] It can be seen from Example 1 and Examples 11-12 that when carbon fibers with an aspect ratio of 300-1500:1 are used, the obtained high-performance antistatic SAS-PA composition has both good antistatic properties and better mechanical properties.

[0110] It can be seen from Comparative Example 1 that when the relative viscosity of the PA resin used is too low, the comprehensive performance of the prepared SAS-PA composition is significantly reduced.

[0111] It can be seen from Comparative Example 2 that when the relative viscosity of the PA resin used is too high, the mechanical properties of the prepared SAS-PA composition are good, but its antistatic properties are significantly reduced.

[0112] It can be seen from Comparative Examples 3 and 4 that when the resin addition ratio is outside the scope of the present invention, the mechanical properties and antistatic properties of the prepared SAS-PA composition decrease to varying degrees.

[0113] It can be seen from Comparative Example 5 that if only carbon fibers are added, the obtained SAS-PA composition has good mechanical properties but poor antistatic properties.

[0114] It can be seen from Comparative Example 6 that if only an antistatic agent is added, the antistatic properties of the prepared SAS-PA composition are excellent, but the mechanical properties are very poor and the anti-fatigue properties are significantly reduced, which are far worse than those of the examples.

[0115] It can be seen from Comparative Example 7 that if glass fiber is used instead of carbon fiber, the mechanical properties, fatigue resistance and antistatic properties of the prepared SAS-PA composition are significantly reduced.

[0116] It can be seen from Comparative Example 8 that if ABS resin is used instead of SAS resin, although the obtained composition has better notched impact performance, the tensile strength and fatigue resistance are significantly reduced, far worse than those of the embodiment, and cannot meet the requirements.

[0117] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the claims of the present invention.

Claims

1. A high-performance antistatic SAS-PA composition, characterized in that: The composition comprises the following components calculated in parts by weight: The relative viscosity of the PA resin is 2.3 to 3.0, and the relative viscosity of the PA resin is measured according to the GB / T38138-2019 test method.

2. The high-performance antistatic SAS-PA composition according to claim 1, characterized in that The composition comprises the following components calculated in parts by weight: The processing aid is an antioxidant and / or a lubricant.

3. The high-performance antistatic SAS-PA composition according to claim 1, characterized in that The aspect ratio of the carbon fiber is (300-1500):

1.

4. The high-performance antistatic SAS-PA composition according to claim 1, characterized in that The melt flow rate of the SAS resin at 220° C. and 10 kg load is 2 to 15 cm 3 / 10min.

5. The high-performance antistatic SAS-PA composition according to claim 1, characterized in that The antistatic agent is a polyether amide antistatic agent and / or a polyether olefin antistatic agent.

6. The high-performance antistatic SAS-PA composition according to claim 1, characterized in that The compatibilizer is at least one of styrene-N-phenylmaleimide-maleic anhydride copolymer or styrene-acrylonitrile-glycidyl methacrylate copolymer.

7. The high-performance antistatic SAS-PA composition according to claim 2, characterized in that The coupling agent is at least one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent or a zirconate coupling agent.

8. A method for preparing the high-performance antistatic SAS-PA composition according to any one of claims 1 to 7, characterized in that: The steps include: S1. The remaining raw materials according to any one of claims 1 to 7 except the carbon fiber are uniformly mixed to obtain a premix; S2. The premix in S1 is fed into the extruder through the main feed port, and the carbon fiber is fed through the side feed port. The high-performance antistatic SAS-PA composition is obtained by melt blending and extrusion granulation.

9. Use of the high-performance antistatic SAS-PA composition according to any one of claims 1 to 7 in the preparation of drone materials.

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