Aromatic sulfone composition as well as preparation method and application thereof

Abstract

The invention provides an aromatic sulfone composition as well as a preparation method and application thereof. The aromatic sulfone composition comprises an aromatic sulfone polymer and polysiloxane, the mass ratio of the aromatic sulfone polymer to the polysiloxane is 1: (0.08-1); and the weight average molecular weight of the polysiloxane is 10000 to 50000. According to the aromatic sulfone composition, polysiloxane and an aromatic sulfone polymer are compounded according to a specific proportion, so that a coating prepared from the aromatic sulfone composition has high adhesive force and also has high hardness and a relatively low friction coefficient, and the coating is unlikely to fall off and good in wear resistance.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to an aromatic sulfone composition, its preparation method, and its application. Background Technology

[0002] Aromatic sulfone polymers are high-temperature resistant, transparent thermoplastic engineering plastics with outstanding thermal properties, excellent chemical resistance, excellent high-temperature creep resistance, superior dimensional stability, extremely low smoke and toxic gas emissions, excellent resistance to hot water and superheated steam, and good electrical properties. With the continuous improvement of aromatic sulfone polymer materials, their application range is expanding, finding applicability in aerospace, medical and health, food, home appliances, electronics, and energy and chemical industries, particularly in food contact and medical and health applications. In high-performance coating applications, aromatic sulfone polymers, with their advantages of high-temperature resistance, corrosion resistance, and good safety, are widely used in non-stick cookware coatings, home appliances, and plastic machinery.

[0003] However, with technological advancements and improved living standards, the performance requirements for aromatic sulfone polymers are becoming increasingly stringent. Currently, in practical applications, aromatic sulfone polymers often experience coating peeling due to low adhesion to the underlying metal or insufficient hardness, thus affecting the product's lifespan. Researchers typically improve coating formulations to enhance performance, such as by adding functional additives to increase hardness or adhesion, but these methods have limitations.

[0004] Therefore, developing an aromatic sulfone polymer material that combines high adhesion, high hardness, and excellent wear resistance is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an aromatic sulfone composition, its preparation method, and its applications. The coating prepared from the aromatic sulfone composition exhibits high adhesion, high hardness, a low coefficient of friction, and good wear resistance.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an aromatic sulfone composition comprising an aromatic sulfone polymer and a polysiloxane; wherein the mass ratio of the aromatic sulfone polymer to the polysiloxane is 1:(0.08~1); and the weight-average molecular weight of the polysiloxane is 10000~50000.

[0008] In this invention, polysiloxane has low surface tension, good lubrication performance, and surface hardness. By compounding polysiloxane with aromatic sulfone polymer in a specific ratio, the coating prepared from the aromatic sulfone composition has high adhesion, high hardness, and a low coefficient of friction, making the coating less prone to peeling and with good wear resistance. During the baking and curing process to form the coating, the polysiloxane cross-links itself or with other components, or undergoes other reactions, which can improve the hardness of the coating.

[0009] In this invention, the mass ratio of the aromatic sulfone polymer to the polysiloxane is 1:(0.08~1), wherein the specific value of (0.08~1) can be, for example, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1 or any range between the above values, and more preferably the mass ratio of the aromatic sulfone polymer to the polysiloxane is 1:(0.25~0.65).

[0010] In this invention, the aromatic sulfone polymer in the aromatic sulfone composition has a mass percentage content of 50-95%, more preferably 53-91%.

[0011] In this invention, the mass percentage of polysiloxane in the aromatic sulfone composition is 5-50%, more preferably 8-45%.

[0012] Preferably, the aromatic sulfone polymer comprises a hydroxyl-terminated aromatic sulfone polymer.

[0013] In this invention, the aromatic sulfone polymer comprises a first structural unit and a second structural unit; the first structural unit is derived from sulfone compounds, and the second structural unit is derived from polyhydroxy compounds; the sulfone compounds include -Dichlorodiphenyl sulfone, -difluorodiphenyl sulfone or -bis(4-chlorophenyl sulfone)- At least one of biphenyl; the polyhydroxy compound includes -Biphenyl diphenol and / or -Dihydroxydiphenyl sulfone.

[0014] Preferably, the aromatic sulfone polymer comprises polyphenylene sulfone resin (PPSU) and / or polyether sulfone resin (PES).

[0015] Preferably, the weight-average molecular weight of the aromatic sulfone polymer is 32,000 to 78,000, for example, it can be 32,000, 35,000, 38,000, 40,000, 42,000, 44,000, 46,000, 48,000, 50,000, 52,000, 54,000, 56,000, 58,000, 60,000, 62,000, 64,000, 66,000, 68,000, 70,000, 72,000, 74,000, 76,000 or any of the above values, more preferably 40,000 to 60,000.

[0016] Preferably, the molecular weight distribution index of the aromatic sulfone polymer is 1.2 to 4.5, for example, it can be 1.2, 1.4, 1.5, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4 or any of the above values, more preferably 2 to 3.

[0017] In this invention, the aromatic sulfone polymer can be obtained commercially or prepared using conventional methods. For example, the aromatic sulfone polymer can be prepared using the following method, which includes the following steps:

[0018] (1) A sulfone compound is reacted with a polyhydroxy compound to form a salt, and the salt product is obtained;

[0019] (2) The salt-forming product is subjected to a polymerization reaction to obtain the aromatic sulfone polymer.

[0020] In this invention, the molar ratio of the sulfone compound to the polyhydroxy compound is 1:(1~3), for example, it can be 1:1.02, 1:1.05, 1:1.08, 1:1.1, 1:1.2, 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, 1:2.8, 1:3 or any range of the above values, more preferably 1:(1.01~2); the salt-forming reaction is carried out in a solvent, the solvent including but not limited to sulfolane; the mass of the solvent is 2 to 3 times the total mass of the sulfone compound and the polyhydroxy compound, for example, it can be 2 times, 2.2 times, 2.4 times, 2.6 times, 2.8 times, 3 times or any range of the above values; the raw materials for the salt-forming reaction also include The mixture includes a salt-forming agent and / or an azeotropic agent; the salt-forming agent includes, but is not limited to, sodium carbonate and / or potassium carbonate; the mass of the salt-forming agent is 1.5 to 3 times the total mass of the sulfone compound and the polyhydroxy compound, for example, it can be 1.5 times, 1.6 times, 1.8 times, 2 times, 2.2 times, 2.4 times, 2.6 times, 2.8 times, 3 times, or any of the above values; the azeotropic agent includes, but is not limited to, toluene and / or xylene; the mass of the azeotropic agent is 0.05 to 1 times the total mass of the sulfone compound and the polyhydroxy compound, for example, it can be 0.05 times, 0.06 times, 0.08 times, 0.1 times, 0.2 times, 0.3 times, 0.4 times, 0.6 times, 0.8 times, 1 times, or any of the above values.

[0021] In this invention, the salt formation reaction in step (1) is carried out in the presence of a protective atmosphere, which includes, but is not limited to, nitrogen; the temperature of the salt formation reaction is 180~210℃ and the time is 3~11h; during the salt formation reaction, the azeotropic agent continuously discharges the reaction water through azeotroping until no water is discharged, at which point the salt formation reaction ends and the azeotropic agent is distilled off; the polymerization reaction in step (2) is carried out at a temperature of 220~250℃ and for 2~6h.

[0022] In this invention, after the polymerization reaction is completed, a post-processing step is also included; the post-processing includes sequentially subjecting the product obtained from the polymerization reaction to acidic water precipitation, crushing with a crusher, boiling with deionized water for at least 1 hour, centrifuging and filtering, repeating the above steps until the filtrate does not become turbid when tested with silver nitrate, indicating that the by-product salts have been washed away, and then removing the water from the purified polymer under vacuum drying to obtain the aromatic sulfone polymer.

[0023] Preferably, the polysiloxane includes at least one of polydimethylsiloxane, hydroxyl-containing polydimethylsiloxane, or amino-containing polydimethylsiloxane, more preferably hydroxyl-containing polydimethylsiloxane and / or amino-containing polydimethylsiloxane.

[0024] Preferably, the polysiloxane comprises at least one of α,ω-bis(hydroxyethoxypropyl)polydimethylsiloxane, bis(hydroxybutyl)polydimethylsiloxane, bis(hydroxypropyl)polydimethylsiloxane, or bis(aminopropyl)polydimethylsiloxane.

[0025] Preferably, the weight-average molecular weight of the polysiloxane is 10,000 to 50,000, for example, it can be 10,000, 12,000, 15,000, 18,000, 20,000, 22,000, 25,000, 28,000, 30,000, 32,000, 35,000, 38,000, 40,000, 42,000, 45,000, 48,000, 50,000 or any of the above values, more preferably 16,000 to 47,000, and particularly preferably 25,500 to 44,500.

[0026] In this invention, the weight-average molecular weight and molecular weight distribution index can be obtained by gel permeation chromatography (GPC). Specifically, polystyrene or polymethyl methacrylate is used as a standard, tetrahydrofuran, N,N-dimethylformamide or chloroform is used as the mobile phase, the sample concentration is 0.1~10 mg / mL, and the weight-average molecular weight and molecular weight distribution index are determined by gel permeation chromatography.

[0027] The aromatic sulfone composition further comprises 0.01 to 5 parts by weight of an auxiliary agent, for example, 0.02 parts, 0.04 parts, 0.06 parts, 0.08 parts, 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, or any range of the above values.

[0028] Preferably, the additives include at least one of antioxidants, lubricants, rust inhibitors, and flame retardants.

[0029] In this invention, the antioxidants include, but are not limited to, primary antioxidants, such as 2,6-di-tert-butyl-p-cresol (BHT). -methylene-bis(4-ethyl-6-tert-butylphenol), -methylene-bis(4-methyl-6-tert-butylphenol), -methylene-bis(4-methyl-6-cyclohexylphenol), -Methylene-bis(4-methyl-6-nonylphenol), octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxyhydrocinnamate) or a combination of at least two of these. An auxiliary antioxidant, such as tris(nonylphenyl) phosphite and / or dilauryl thiodipropionate.

[0030] In this invention, the lubricant includes, but is not limited to, at least one of ethylene bis-stearamide (EBS), glyceryl monostearate, oleamide, and erucamide.

[0031] In this invention, the rust inhibitor includes, but is not limited to, rust inhibitory additives and rust inhibitory pigments; the rust inhibitory additives include, but are not limited to, zinc phosphate; and the rust inhibitory pigments include, but are not limited to, titanium dioxide.

[0032] In this invention, the flame retardant includes, but is not limited to, at least one of melamine polyphosphate, melamine cyanurate, triphenyl phosphate, ammonium polyphosphate, antimony trioxide, magnesium hydroxide, and aluminum hydroxide.

[0033] In this invention, the antioxidant, lubricant, rust inhibitor and flame retardant in the aromatic sulfone composition are each independently 0.01 to 1.5 parts by weight.

[0034] In a second aspect, the present invention provides a method for preparing the aromatic sulfone composition described in the first aspect, the method comprising the following steps:

[0035] The aromatic sulfone polymer and polysiloxane, along with optional additives, are mixed and melt-extruded to obtain the aromatic sulfone composition.

[0036] Preferably, the temperature of the melt extrusion is 250~350℃, for example, it can be 250℃, 260℃, 280℃, 300℃, 320℃, 340℃ or any of the above values.

[0037] Preferably, the rotation speed of the melt extrusion is 100~300 rpm, for example, it can be 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm or any of the above values.

[0038] In this invention, the vacuum degree of the melt extrusion is -0.08 to -0.1 MPa.

[0039] Thirdly, the present invention provides a polymer coating prepared using the aromatic sulfone composition described in the first aspect.

[0040] Preferably, the coefficient of friction of the polymer coating is ≤0.22.

[0041] Preferably, the hardness of the polymer coating is ≥2H.

[0042] In this invention, the thickness of the polymer coating is 20±5μm.

[0043] In this invention, the polymer coating can be prepared by coating the aromatic sulfone composition onto the surface of a substrate and then baking and curing it using a surface coating method commonly used in the prior art. The preparation method of the polymer coating includes, but is not limited to, dispersing or dissolving the aromatic sulfone composition in a coating and applying it to the surface of a substrate, followed by baking and curing. In one embodiment, the preparation method of the polymer coating includes: mixing the aromatic sulfone composition with a solvent (including but not limited to N-methylpyrrolidone) to obtain a slurry with a solid content of 20-30 wt%; coating the slurry onto the surface of a substrate (including but not limited to an aluminum plate); baking at 100-200°C for 0.5-3 hours; and then baking at 260-460°C for 10-40 minutes to obtain the polymer coating.

[0044] In this invention, the wet film thickness of the polymer coating is 3~50μm, more preferably 15~25μm. The polymer coating can be used in non-stick cookware coatings, household appliances, plastic machinery, etc.

[0045] Fourthly, the present invention provides an article having the polymer coating described in the third aspect on its surface.

[0046] In this invention, the product includes, but is not limited to, metal products, plastic products, rubber products, etc.; the polymer coating is a primer layer that directly contacts the substrate, and the substrate includes, but is not limited to, metal substrates, plastic substrates, rubber substrates, etc.

[0047] In this invention, the products include, but are not limited to, household appliances, kitchen utensils, and plastic machinery products.

[0048] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0050] The aromatic sulfone composition provided by the present invention uses polysiloxane with a specific weight-average molecular weight and aromatic sulfone polymer in a specific ratio to make the coating prepared by the aromatic sulfone composition have high adhesion, high hardness and low coefficient of friction, so that the coating is not easy to fall off and has good wear resistance. Detailed Implementation

[0051] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention.

[0052] In this invention, the methods for testing the molecular weight distribution index and weight-average molecular weight are as follows:

[0053] Polystyrene was used as the standard, tetrahydrofuran was used as the mobile phase, and the polymer concentration was 5 mg / mL. The weight-average molecular weight and molecular weight distribution index of the samples were determined by gel permeation chromatography.

[0054] All materials used in this invention are commercially available or prepared using conventional methods. Unless otherwise specified, the materials used in this invention are as follows:

[0055] Sulfolane: Solvent, purity >99.8%.

[0056] - Dichlorodiphenyl sulfone: a reactive monomer with a purity >99.5%.

[0057] -Biphenyl hydroquinone: a reactive monomer with a purity >99.5%.

[0058] - Dihydroxydiphenyl sulfone: a reactive monomer with a purity >99.5%.

[0059] Xylene: Azeotropic agent, isomer grade.

[0060] Sodium carbonate: Salt-forming agent, purity >99.5%.

[0061] Preparation Example 1

[0062] This preparation example provides a polyphenylene sulfone resin, and the preparation method of the polyphenylene sulfone resin is as follows:

[0063] 36 kg of sulfolane and 8.61 kg of [unspecified substance] were quantitatively added to a 100 L reactor protected with high-purity nitrogen. - Dichlorodiphenyl sulfone (30 mol) and 5.70 kg Bisphenol A (30.6 mol) was stirred and heated, and 33 kg of sodium carbonate and 3 kg of xylene were added. Solution polycondensation was employed, maintaining the temperature between 180 and 210 °C for 6 hours. During the reaction, the azeotropic agent xylene continuously discharged reaction water through azeotropic action until no more water was discharged, indicating the salt formation reaction was complete. Xylene was then distilled off. Afterward, the reaction system was heated to 240 °C and maintained for 2.5 hours. Stirring and heating were stopped, and the resulting material was precipitated into strips in acidic water. This strip was then crushed to obtain a powder, which was boiled in deionized water for 1 hour, centrifuged, and filtered. This process was repeated 8-10 times until the filtrate remained unchanged when tested with silver nitrate. The purified product was then dried under vacuum to remove moisture, yielding polyphenylene sulfone (PPSU) resin. GPC testing showed a weight-average molecular weight (Mw) of 45,000 and a molecular weight distribution (PDI) of 2.2.

[0064] Preparation Example 2

[0065] This preparation example provides a polyethersulfone resin, and the preparation method of the polyethersulfone resin is as follows:

[0066] 36 kg of sulfolane and 8.61 kg of [unspecified substance] were quantitatively added to a 100 L reactor protected with high-purity nitrogen. - Dichlorodiphenyl sulfone (30 mol) and 7.66 kg - Dihydroxydiphenyl sulfone (30.6 mol) was stirred and heated, and 33 kg of sodium carbonate and 3 kg of xylene were added. Solution polycondensation was employed, and the temperature was maintained between 180 and 210 °C for 6 h. During the reaction, the azeotropic agent xylene continuously discharged reaction water through azeotropic action until no more water was discharged, at which point the salt formation reaction was complete, and xylene was distilled off. Afterward, the reaction system was heated to 240 °C and maintained for 2.5 h. Stirring and heating were stopped, and the resulting material was precipitated into strips in acidic water. This strip was then crushed to obtain a powder, boiled in deionized water for 1 h, centrifuged, and filtered. This process was repeated 8-10 times until the filtrate remained clear when tested with silver nitrate. The purified polymer was then dried under vacuum to remove moisture, yielding polyethersulfone (PES) resin. GPC testing showed a weight-average molecular weight (Mw) of 54,000 and a molecular weight distribution (PDI) of 2.3.

[0067] Preparation Example 3

[0068] This preparation example provides a polyphenylene sulfone resin with a weight-average molecular weight (Mw) of 58,000 and a molecular weight distribution (PDI) of 2.8. The difference between this and Preparation Example 1 is that 5.66 kg of [unspecified ingredient] was added. -Biphenyl hydroquinone (30.4 mol), other steps are the same as in Preparation Example 1.

[0069] Preparation Example 4

[0070] This preparation example provides a polyphenylene sulfone resin with a weight-average molecular weight (Mw) of 35,000 and a molecular weight distribution (PDI) of 2.3. The difference between this and Preparation Example 1 is that 5.74 kg of [unspecified ingredient] was added. -Biphenyl hydroquinone (30.8 mol), other steps are the same as in Preparation Example 1.

[0071] Preparation Example 5

[0072] This preparation example provides a polyphenylene sulfone resin with a weight-average molecular weight (Mw) of 76,000 and a molecular weight distribution (PDI) of 2.1. The difference between this and Preparation Example 1 is that 5.62 kg of [unspecified ingredient] was added. -Biphenyl hydroquinone (30.2 mol); after the salt formation reaction was completed, xylene was distilled off. Then, the reaction system was heated to 240 °C and maintained for 3 h. The other steps were the same as in Preparation Example 1.

[0073] Preparation Example 6

[0074] This preparation example provides a polyphenylene sulfone resin with a weight-average molecular weight Mw = 46,000 and a molecular weight distribution PDI = 1.3. The difference between this example and Preparation Example 1 is that the resin is kept at 180~210℃ for 10 h, while the other steps are the same as those in Preparation Example 1.

[0075] Preparation Example 7

[0076] This preparation example provides a polyphenylene sulfone resin with a weight-average molecular weight Mw = 48,000 and a molecular weight distribution PDI = 4.2. The difference between this example and Preparation Example 1 is that it is kept at 180~210℃ for 4 h, while the other steps are the same as those in Preparation Example 1.

[0077] Examples 1-19, Comparative Examples 1-7

[0078] Examples 1-19 and Comparative Examples 1-7 each provide an aromatic sulfone composition, the composition of which is shown in Tables 1-4; wherein, the values ​​in Tables 1-4 represent the mass ratio of the aromatic sulfone polymer to the polysiloxane; the preparation method of the aromatic sulfone composition includes the following steps:

[0079] The aromatic sulfone polymer, polysiloxane, and optional additives are added to a twin-screw extruder in proportion. The extrusion temperature is 350°C, the screw speed is 250 rpm, the vacuum is evacuated to a vacuum degree of -0.09 MPa, and the extrusion is granulated to obtain the aromatic sulfone composition.

[0080] In this invention, the polysiloxanes of different molecular weights are all sourced from Merck, and their purity is all >98%.

[0081] Titanium dioxide and zinc phosphate were purchased from Guangzhou Chemical Reagent Factory. They were of analytical grade and had a purity of >99%.

[0082] Commercially available PPSU: Ultrason P3010, with a power consumption of 5.5W and a power density of 2.2.

[0083] Table 1

[0084]

[0085] Table 2

[0086]

[0087] Table 3

[0088]

[0089] Table 4

[0090]

[0091] Performance testing

[0092] The aromatic sulfone compositions provided in the examples and comparative examples were mixed with N-methylpyrrolidone (NMP) to obtain a slurry with a solid content of 25 wt%. The slurry was then coated onto a dry, smooth aluminum plate surface using a coating tool to obtain a wet film thickness of 20 ± 5 μm. The coated film was then baked in an oven at 150°C for 1 hour, followed by high-temperature baking at 380°C for 20 minutes in a muffle furnace to prepare a polymer coating. The obtained polymer coating underwent the following performance tests.

[0093] (1) Adhesion: The adhesion was tested according to ISO 2409:2020 standard. Specifically, the polymer coating prepared above was placed on a plate with sufficient hardness. The handle of the cross-cutting tool was held so that the multi-blade cutter was perpendicular to the coating plane and formed a grid pattern. 25mm wide 3M tape was applied to the entire grid and then peeled off at the smallest angle. The peeling of the paint film was observed. The test results were divided into grades 0, 1 and 2.

[0094] Grade 0: The edges of the cut are completely smooth, and there is no peeling at the edges of the grid.

[0095] Level 1: Small pieces peel off at the intersection of the cuts, and the actual damage within the gridded area does not exceed 5%.

[0096] Grade 2: Peeling is present at the edges and / or intersections of the incision, covering an area greater than 5% but less than 15%.

[0097] (2) Hardness: The hardness was tested using a pencil hardness tester. According to the standard ASTM D3363, pencils of different hardness were used to scratch the surface of the above polymer coating multiple times at the same angle and force. The hardness value of the pencil that just scratched the coating was defined as the hardness of the polymer coating, which characterizes the scratch resistance of the coating.

[0098] (3) Coefficient of friction: tested according to ISO 8295:1995 standard.

[0099] The specific test results are shown in Table 5.

[0100] Table 5

[0101]

[0102] As shown in Table 5, the aromatic sulfone composition provided by the present invention uses polysiloxane and aromatic sulfone polymer compounded in a specific ratio, so that the coating prepared by the aromatic sulfone composition has high adhesion, high hardness and low coefficient of friction, making the coating not easy to fall off and with good wear resistance; the coating prepared by the aromatic sulfone composition has a coefficient of friction ≤0.22, a hardness ≥2H, and an adhesion grade of 0 or 1.

[0103] A comparison of Examples 4 and Examples 15-18 shows that using an aromatic sulfone polymer with specific Mw and PDI to compound with polysiloxane is beneficial to further improve the hardness of the coating and / or reduce the coefficient of friction of the coating.

[0104] As can be seen from the comparison between Example 1 and Comparative Examples 1 and 2, the polysiloxane and aromatic sulfone polymer are compounded in a specific ratio, which enables the polymer coating to have both high adhesion, hardness and low coefficient of friction.

[0105] As can be seen from the comparison between Example 1 and Comparative Example 3, and Example 6 and Comparative Example 4, compared with aromatic polymers, the addition of polysiloxane can significantly improve the hardness of the polymer coating and reduce its coefficient of friction.

[0106] As can be seen from the comparison between Example 1 and Comparative Example 5, when polyetherimide-siloxane block copolymer is used to replace polysiloxane, the adhesion and hardness of the resulting polymer coating are reduced, and the coefficient of friction is increased.

[0107] As can be seen from the comparison between Example 1 and Comparative Examples 6 and 7, the coating hardness is reduced and the coefficient of friction is increased when a specific Mw polysiloxane is not used.

[0108] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. An aromatic sulfone composition characterized in that, The aromatic sulfone composition comprises an aromatic sulfone polymer and a polysiloxane; The aromatic sulfone polymer and the polysiloxane are in a mass ratio of 1:(0.08-1); The polysiloxane has a weight average molecular weight of 10,000-50,000.

2. The aromatic sulfone composition according to claim 1, characterized in that, The aromatic sulfone polymer and the polysiloxane are in a mass ratio of 1:(0.25-0.65).

3. The aromatic sulfone composition according to claim 1 or 2, characterized in that, The aromatic sulfone polymer comprises a hydroxyl-terminated aromatic sulfone polymer; Preferably, the aromatic sulfone polymer comprises a polyphenylene sulfone resin and / or a polyether sulfone resin.

4. The aromatic sulfone composition according to any one of claims 1 to 3, characterized in that, The aromatic sulfone polymer has a weight average molecular weight of 32,000-780,000, more preferably 40,000-600,000. Preferably, the aromatic sulfone polymer has a molecular weight distribution index of 1.2-4.5, more preferably 2-3.

5. The aromatic sulfone composition according to any one of claims 1 to 4, characterized in that, The polysiloxane comprises at least one of a polydimethylsiloxane, a hydroxyl-containing polydimethylsiloxane or an amino-containing polydimethylsiloxane, more preferably a hydroxyl-containing polydimethylsiloxane and / or an amino-containing polydimethylsiloxane; Preferably, the polysiloxane comprises at least one of an α,ω-bis(hydroxyethoxypropyl) polydimethylsiloxane, a bis(hydroxybutyl) polydimethylsiloxane, a bis(hydroxypropyl) polydimethylsiloxane or a bis(aminopropyl) polydimethylsiloxane.

6. The aromatic sulfone composition according to any one of claims 1 to 5, characterized in that, The aromatic sulfone composition further comprises 0.01-5 parts of an auxiliary agent in terms of weight parts; Preferably, the auxiliary agent comprises at least one of an antioxidant, a lubricant, an antirust agent and a flame retardant.

7. A process for the preparation of the aromatic sulfone composition according to any one of claims 1 to 6, characterized in that, The preparation method comprises the following steps: Mixing the aromatic sulfone polymer and the polysiloxane and optionally the auxiliary agent, melt extruding to obtain the aromatic sulfone composition; Preferably, the melt extruding is performed at a temperature of 250-350℃. Preferably, the melt extruding is performed at a rotation speed of 100-300 rpm.

8. A polymeric coating characterized by, The polymer coating is prepared by using the aromatic sulfone composition according to any one of claims 1-6.

9. The polymeric coating of claim 8, wherein, The polymer coating has a friction coefficient of ≤0.

22. Preferably, the polymer coating has a hardness of ≥2H.

10. An article of manufacture characterized by, The article has a surface provided with the polymer coating according to claim 8 or 9.

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