A tear-resistant polyphenylene sulfide composite film and a method for manufacturing the same

Abstract

The application discloses an anti-tearing polyphenylene sulfide composite film and a preparation method thereof. The preparation method comprises the following steps: covering polyphenylene sulfide non-woven fabric on upper and lower surfaces of an aramid short-cut fiber layer respectively to form a three-layer composite structure with the polyphenylene sulfide non-woven fabric as top and bottom layers and the aramid short fiber as an intermediate layer, and preparing the polyphenylene sulfide composite film by using a hot-pressing process. The polyphenylene sulfide non-woven fabric is melted in situ by heat, the polyphenylene sulfide non-woven fabric melt has good wettability on the surface of the aramid short-cut fiber, and the polyphenylene sulfide melt is firmly bonded on the surface of the aramid short-cut fiber after hot-pressing, so that the anti-tearing capacity of the polyphenylene sulfide composite film is improved. The application has simple process steps, is easy to operate, and has a good industrial application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite films, and particularly relates to a tear-resistant polyphenylene sulfide composite film and a preparation method thereof. BACKGROUND

[0002] Polyphenylene sulfide (PPS) is a semi-crystalline polymer with alternating benzene rings and thioether bonds, which has excellent thermal stability, chemical resistance, flame resistance, etc. and is applied in transportation, environmental protection, aerospace, national defense and military industry, etc. and is called one of the "six engineering plastics" and "eight aerospace materials". The prominent advantages of PPS include high temperature resistance, radiation resistance, corrosion resistance, good mechanical properties, electrical properties, flame resistance and biocompatibility, various molding methods and wide application. In addition, the products can also be subjected to secondary processing. However, PPS also has some disadvantages, such as large chain structure rigidity, which leads to low mechanical properties of PPS resin, especially low tear resistance, which limits its application to some extent.

[0003] The invention patent with the patent publication number CN108437487A discloses "a polyphenylene sulfide composite material with high glass fiber content and a preparation method thereof". The method uses polyphenylene sulfide non-woven fabric and glass fiber cloth as raw materials, and forms a composite material by alternately stacking and hot pressing. When the content of glass fiber is higher than 70% and on the basis of the existing technology, the tensile strength and bending strength of the composite material are further improved. However, the glass fiber reinforced polyphenylene sulfide composite material is difficult to form, and the tear resistance is not significantly increased due to its unstable structure.

[0004] The invention patent with the patent publication number CN114573984A discloses "a liquid silica gel grafted modified toughened polyphenylene sulfide and a preparation method thereof". The method uniformly disperses liquid silica gel, polyphenylene sulfide resin, initiator and accelerator, and then melts and reacts through a first double screw extruder, extrudes, cools, granulates and dries to obtain grafted polyphenylene sulfide resin particles. Then, the grafted polyphenylene sulfide resin particles are uniformly dispersed with coupling agent, antioxidant and processing aid, and then extruded and granulated through a second double screw extruder. This method improves the toughness, electrical properties, wear resistance and fatigue resistance of the modified toughened polyphenylene sulfide material. However, the tear resistance is still a challenge, and the process is complicated, too many organic solvents are added, and the preparation process is not simple enough.

[0005] Through the above analysis, the problems and defects of the prior art are: although the process preparation and modification of polyphenylene sulfide can improve its performance to some extent, the short time of polyphenylene sulfide in the hot melting process will directly affect the flowability of polyphenylene sulfide and indirectly affect the deformation of glass fiber and / or carbon fiber; the dynamic vulcanization grafting technology in the modification is to introduce a flexible group containing silicon after the unstable free radicals in the polyphenylene sulfide molecular chain are reacted to form a chemical bond, which only effectively solves the defect that polyphenylene sulfide is easy to be oxidized and discolored, and does not improve the tear resistance.

[0006] The present application aims to provide a tear-resistant polyphenylene sulfide composite film, polyphenylene sulfide non-woven fabric covers the upper and lower surfaces of aramid short fiber layer respectively, forming a three-layer composite structure with polyphenylene sulfide non-woven fabric as top layer and bottom layer, aramid short fiber as intermediate layer, and polyphenylene sulfide composite film is prepared by hot pressing process. The polyphenylene sulfide non-woven fabric is melted in situ, the polyphenylene sulfide non-woven fabric melt has good wettability on the surface of aramid short fiber, and the PPS melt is firmly bonded to the surface of aramid short fiber after hot pressing, thereby improving the tear resistance of the polyphenylene sulfide composite film. The process steps of the present application are simple, easy to operate, and have good industrial application prospect. SUMMARY

[0007] The present application aims to provide a tear-resistant polyphenylene sulfide composite film and its preparation method, the method for preparing the polyphenylene sulfide composite film has simple manufacturing process steps, easy operation, and the tear resistance of the composite material is greatly improved, which has good industrial application prospect.

[0008] The present application is a method for improving the tear resistance of PPS composite paper by using aramid short fiber, which is characterized by the following steps:

[0009] (a) depositing aramid short fiber onto the upper surface of polyphenylene sulfide non-woven fabric to obtain polyphenylene sulfide non-woven fabric loaded with aramid short fiber;

[0010] (b) covering the polyphenylene sulfide non-woven fabric on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fiber to form a three-layer composite structure with polyphenylene sulfide non-woven fabric as top layer and bottom layer, and aramid short fiber as intermediate layer;

[0011] (c) preparing polyphenylene sulfide composite film by hot pressing process for the three-layer composite structure of step (b).

[0012] Further, in step (a), the polyphenylene sulfide non-woven fabric has a grammage of 20-200g / m 2 ;

[0013] Furthermore, in step (b), the deposition method includes, but is not limited to, one of dry papermaking, electrostatic flocking, inclined wire papermaking, and vacuum filtration.

[0014] Furthermore, the top, middle, and bottom layers of the polyphenylene sulfide composite film are in the following mass ratio: (25-60):(5-20):(25-60);

[0015] Preferably, the mass fraction ratio of the top layer, middle layer and bottom layer of the polyphenylene sulfide composite film is (30-50):(5-15):(30-50);

[0016] Furthermore, in step (c), the hot pressing temperature is 100℃~240℃, the hot pressing pressure is 0.1MPa~0.5MPa, and the hot pressing roller speed is 3m / min~50m / min;

[0017] Preferably, the hot pressing temperature is 100℃~200℃; more preferably, the hot pressing temperature is 130-240℃; more preferably, the hot pressing temperature is 180-200℃.

[0018] Preferably, the hot pressing pressure is 0.2-0.4 MPa; more preferably, it is 0.3-0.4 MPa.

[0019] Preferably, the hot press roller speed is 5-50 m / min; more preferably, the hot press roller speed is 10-30 m / min.

[0020] On the other hand, this disclosure also provides a tear-resistant polyphenylene sulfide composite film, which is prepared by the above method;

[0021] The tear-resistant polyphenylene sulfide composite film has a three-layer composite structure;

[0022] The three-layer composite structure uses polyphenylene sulfide nonwoven fabric as the top and bottom layers, and aramid staple fiber as the middle layer.

[0023] The polyphenylene sulfide composite film has a top layer, middle layer and bottom layer in a mass ratio of (25-60):(5-20):(25-60);

[0024] The length of the aramid short yarn is less than 15 mm, preferably less than 10 mm, and more preferably less than 8 mm;

[0025] The tear-resistant polyphenylene sulfide composite film has a tear index of at least 46 mN·m. 2 / g;

[0026] Preferably, the tear index of the polyphenylene sulfide composite film is at least greater than 50 mN·m. 2 / g;

[0027] The tensile strength of the tear-resistant polyphenylene sulfide composite film is at least greater than 150 Mpa; preferably greater than 155 Mpa;

[0028] The bending strength of the tear-resistant polyphenylene sulfide composite film is at least greater than 240 Mpa; preferably greater than 286 Mpa;

[0029] The impact strength is at least greater than 27 KJ / m 2 ;

[0030] The present application forms a dense polyphenylene sulfide composite film with an intermediate aramid short fiber layer by tightly bonding the aramid short fiber structure without damaging it with high-temperature molten polyphenylene sulfide non-woven fabric. The polyphenylene sulfide non-woven fabric is melted in situ, and the polyphenylene sulfide non-woven fabric melt has good wettability on the surface of the aramid short fiber, and the PPS melt is firmly bonded to the surface of the aramid short fiber after hot pressing, thereby improving the tear resistance of the polyphenylene sulfide composite film. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 : Structure diagram of polyphenylene sulfide composite film;

[0032] Figure 2 : Surface electron microscope image of polyphenylene sulfide non-woven fabric;

[0033] Figure 3 : Surface electron microscope image of polyphenylene sulfide composite film; DETAILED DESCRIPTION

[0034] The following is a specific embodiment of the present application, which further describes the technical solutions of the present application, but the present application is not limited to these embodiments.

[0035] In combination Figure 1 With the structure of the polyphenylene sulfide composite film shown, the present embodiment specifically uses the following method to prepare the polyphenylene sulfide composite film, including the following steps:

[0036] (a) depositing aramid short fibers onto the upper surface of the polyphenylene sulfide non-woven fabric to obtain polyphenylene sulfide non-woven fabric loaded with aramid short fibers;

[0037] (b) covering the polyphenylene sulfide non-woven fabric on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers to form a three-layer composite structure with the polyphenylene sulfide non-woven fabric as the top layer and the bottom layer, and the aramid short fiber as the intermediate layer;

[0038] (c) preparing the polyphenylene sulfide composite film by using hot pressing process on the three-layer composite structure of step (b).

[0039] From Figure 1It can be seen that the anti-tear polyphenylene sulfide composite film prepared by the present application is a three-layer composite structure; the three-layer composite structure takes polyphenylene sulfide non-woven fabric as the top layer and the bottom layer, and aramid short fibers as the middle layer.

[0040] The parts in the following examples are unit area parts. Specifically, we selected a gram weight of polyphenylene sulfide non-woven fabric of 50 g / m 2 .

[0041] Example 1

[0042] A preparation method of an anti-tear polyphenylene sulfide composite film, the preparation method is carried out according to the following steps:

[0043] a. Deposition treatment of aramid short fibers

[0044] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h to obtain a dispersant for use, 10 parts of aramid short fibers with a fiber length of 6 mm are placed in a fiber disintegrator and disintegrated at a speed of 5000 r / min for 10 min, then the dispersing liquid is stirred uniformly to obtain a suspension; the suspension is naturally settled on the upper surface of the polyphenylene sulfide non-woven fabric through a sieve with a mesh size of 80 and a diameter of 20 mm, to obtain polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0045] b. Preparation of an anti-tear polyphenylene sulfide composite film

[0046] After covering the polyphenylene sulfide non-woven fabric on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, hot rolling treatment is carried out to obtain a three-layer composite structure of the polyphenylene sulfide composite film, which takes polyphenylene sulfide non-woven fabric as the top layer and the bottom layer, and aramid short fibers as the middle layer. The hot rolling temperature of the roller press is 100°C, the hot rolling pressure is 0.2 MPa, and the roller rolling line speed is 3 m / min.

[0047] Example 2

[0048] A preparation method of an anti-tear polyphenylene sulfide composite film, the preparation method is carried out according to the following steps:

[0049] a. Deposition treatment of aramid short fibers

[0050] Take 10 parts of aramid short fibers with a fiber length of 6 mm and place them in a fiber crusher to crush them into fiber groups, and then further separate them into single aramid fibers; the airflow mixed with the single fibers is delivered to a web former while being vacuumed, to form an aramid fiber web on the forming net, and finally to be extruded and compacted to obtain aramid paper. The aramid paper is covered on the upper surface of the polyphenylene sulfide non-woven fabric to obtain polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0051] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0052] The polyphenylene sulfide nonwoven fabric is covered on the upper surface of the polyphenylene sulfide nonwoven fabric loaded with aramid short fibers prepared in step a, and then heat rolling treatment is performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of aramid short fibers as the middle layer and polyphenylene sulfide nonwoven fabric as the top layer and the bottom layer. The heat rolling temperature of the roller press is 100°C, the heat rolling pressure is 0.3 MPa, and the roller rolling linear speed is 3 m / min.

[0053] Example 3

[0054] A preparation method of a tear-resistant polyphenylene sulfide composite film, which is prepared by the following steps:

[0055] a. Deposition treatment of aramid short fibers

[0056] 10 parts of aramid short fibers with a fiber length of 6 mm are cut into finer short fibers with a length of 1 mm; an electrostatic flocking device is used, a high-voltage power supply is connected to upper and lower electrode plates, the cut short fibers are placed on the upper end of the lower electrode plate, and polyphenylene sulfide nonwoven fabric is placed on the lower end of the upper electrode plate, followed by electrostatic flocking by applying a step electric field until the maximum flocking density is reached. The aramid flock is adsorbed on the upper surface of the polyphenylene sulfide nonwoven fabric by the action of electrostatic attraction to obtain polyphenylene sulfide nonwoven fabric loaded with aramid short fibers.

[0057] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0058] The polyphenylene sulfide nonwoven fabric is covered on the upper surface of the polyphenylene sulfide nonwoven fabric loaded with aramid short fibers prepared in step a, and then heat rolling treatment is performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of aramid short fibers as the middle layer and polyphenylene sulfide nonwoven fabric as the top layer and the bottom layer. The heat rolling temperature of the roller press is 200°C, the heat rolling pressure is 0.3 MPa, and the roller rolling linear speed is 3 m / min.

[0059] Example 4

[0060] A preparation method of a tear-resistant polyphenylene sulfide composite film, which is prepared by the following steps:

[0061] a. Deposition treatment of aramid short fibers

[0062] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3The dispersion agent was obtained by adding 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide into 1.6 x 10

[0063] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0064] The polyphenylene sulfide non-woven fabric was covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment was performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top and bottom layers and aramid short fibers as the middle layer. The hot rolling temperature of the roller press was 240°C, the hot rolling pressure was 0.3 MPa, and the rolling linear speed was 3 m / min.

[0065] Example 5

[0066] A tear-resistant polyphenylene sulfide composite film and a preparation method thereof, the preparation method being performed according to the following steps:

[0067] a. Deposition treatment of aramid short fibers

[0068] The dispersion agent was obtained by adding 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide into 1.6 x 10 3 The dispersion agent was obtained by adding 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide into 1.6 x 10

[0069] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0070] The polyphenylene sulfide non-woven fabric was covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment was performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top and bottom layers and aramid short fibers as the middle layer. The hot rolling temperature of the roller press was 240°C, the hot rolling pressure was 0.3 MPa, and the rolling linear speed was 3 m / min.

[0071] Example 6

[0072] A tear-resistant polyphenylene sulfide composite film and a preparation method thereof, the preparation method being performed according to the following steps:

[0073] a. Deposition of aramid short fibers

[0074] Aramid short fibers of 10 parts with length of 6 mm were dispersed and defibered in water to make a slurry of aramid short fibers with mass concentration of 0.5%, the head pressure of the slurry was adjusted, the slurry was distributed transversely by a center headbox, the slurry with uniform speed and fiber dispersion was distributed onto the inclined headbox flow box, the slurry was evenly distributed onto the two forming wires, the excess slurry overflowed to the white water tank, when the slurry ran along the forming wire, water was filtered out from the slurry by the action of the dewatering pressure difference, and a wet paper sheet was formed; the wet paper sheet was covered on the upper surface of the polyphenylene sulfide non-woven fabric to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0075] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0076] The polyphenylene sulfide non-woven fabric was covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment was performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top layer and bottom layer and aramid short fibers as middle layer, wherein the hot rolling temperature of the roller press was 240°C, the hot rolling pressure was 0.5 MPa, and the roller rolling linear speed was 3 m / min.

[0077] Comparative Example 1

[0078] A tear-resistant polyphenylene sulfide composite film and a preparation method thereof, the preparation method being performed according to the following steps:

[0079] a. Deposition of aramid short fibers

[0080] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide were added into 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h to obtain a dispersant for use, 10 parts of aramid short fibers with length of 6 mm were placed in a fiber dissociator, dissociated at a speed of 5000 r / min for 10 min, and then the dispersant was stirred uniformly to obtain a suspension; the suspension was naturally settled on the upper surface of the polyphenylene sulfide non-woven fabric through a sieve with a mesh size of 80 and a diameter of 20 mm to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0081] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0082] The polyphenylene sulfide non-woven fabric was covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment was performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top layer and bottom layer and aramid short fibers as middle layer, wherein the hot rolling temperature of the roller press was 90°C, the hot rolling pressure was 0.2 MPa, and the roller rolling linear speed was 1 m / min.

[0083] Comparative Example 2

[0084] A preparation method of a tear-resistant polyphenylene sulfide composite film, the preparation method being performed in the following steps:

[0085] a. deposition treatment of aramid short fibers

[0086] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide were added to 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h to obtain a dispersant for use, and 3 parts of aramid short fibers with a fiber length of 6 mm were placed in a fiber dissociator and dissociated at a speed of 5000 r / min for 10 min, and then the dispersant was stirred uniformly to obtain a suspension; the suspension was naturally settled on the upper surface of the polyphenylene sulfide non-woven fabric through a sieve with a mesh size of 80 and a diameter of 20 mm to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0087] b. preparation of a tear-resistant polyphenylene sulfide composite film

[0088] After the polyphenylene sulfide non-woven fabric was covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, hot rolling treatment was performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top and bottom layers and aramid short fibers as an intermediate layer, wherein the hot rolling temperature of the roller press was 90°C, the hot rolling pressure was 0.1 MPa, and the roller rolling linear speed was 1 m / min.

[0089] Comparative Example 3

[0090] A preparation method of a tear-resistant polyphenylene sulfide composite film, the preparation method being performed in the following steps:

[0091] a. deposition treatment of aramid short fibers

[0092] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide were added to 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h to obtain a dispersant for use, and 10 parts of aramid short fibers with a fiber length of 6 mm and a grammage of 40 g / m 2 were placed in a fiber dissociator and dissociated at a speed of 5000 r / min for 10 min, and then the dispersant was stirred uniformly to obtain a suspension; the suspension was vacuum filtered onto the upper surface of the polyphenylene sulfide non-woven fabric to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0093] b. preparation of a tear-resistant polyphenylene sulfide composite film

[0094] The polyphenylene sulfide nonwoven fabric loaded with aramid short fibers prepared in step a is subjected to hot rolling treatment, wherein the hot rolling temperature of the roller press is 150°C, the hot rolling pressure is 0.3 MPa, and the roller rolling linear speed is 3 m / min.

[0095] Comparative Example 4

[0096] A kind of tear-resistant polyphenylene sulfide composite film and its preparation method, the preparation method is carried out according to the following steps:

[0097] a. deposition treatment of aramid short fibers

[0098] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 × 10 3 parts of water, stirred at 450 rpm for 6 h, to obtain a dispersant for use, 10 parts of aramid short fibers and 50 parts of polyphenylene sulfide nonwoven fabric are placed in a fiber dissociator and dissociated at a speed of 5000 r / min for 10 min, then the dispersing solution is stirred uniformly to obtain a suspension; the mixed suspension is placed in a paper former to form a shape, and after dehydration, a wet composite fiber web is obtained, which is placed in a blast drying oven and dried at 110°C for 4 h to obtain a composite polyphenylene sulfide fiber base paper.

[0099] b. preparation of a tear-resistant polyphenylene sulfide composite film

[0100] The composite polyphenylene sulfide fiber base paper prepared in step a is subjected to hot rolling treatment, wherein the hot rolling temperature of the roller press is 150°C, the hot rolling pressure is 0.3 MPa, and the roller rolling linear speed is 3 m / min.

[0101] The materials obtained in Examples 1-5 are tested, and the results are as follows:

[0102]

[0103] The materials obtained in Comparative Examples 1-4 are tested, and the results are as follows:

[0104] Test item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Tensile strength (Mpa) 49.6 30.8 32.5 51.7 Flexural strength (Mpa) 124.2 86.5 98.8 135.4 Impact strength (KJ / m 2 )]]> 15.6 11.1 13.6 13.4 Tear index (mN-m / g) 2 / g) 18.6 12.8 21.4 20.5

[0105] In the three-layer structure of the sheet obtained in Examples 1-6 and Comparative Examples 1-4 above, the three-layer composite structure has polyphenylene sulfide nonwoven fabric as the top and bottom layers and aramid short fibers as the middle layer; the top layer, middle layer and bottom layer of the polyphenylene sulfide composite film are in a mass ratio of 45:10:45, and the grammage relationship of Comparative Example 4

[0106] As can be seen from the above table, the tear-resistant polyphenylene sulfide composite film prepared by the above method is tested, and the hot rolling temperature and the interlayer structure of the polyphenylene sulfide layer will affect the performance test of the composite film.

[0107] Example 7

[0108] A preparation method of a tear-resistant polyphenylene sulfide composite film, the preparation method being performed according to the following steps:

[0109] a. deposition treatment of aramid short fibers

[0110] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h, to obtain a dispersant for use, and 12 parts of aramid short fibers with a fiber length of 6 mm are placed in a fiber dissociator and dissociated at a speed of 5000 r / min for 10 min, and then the dispersant is stirred uniformly to obtain a suspension; the suspension is naturally settled on the upper surface of the polyphenylene sulfide non-woven fabric through a sieve with a mesh size of 80 and a mesh size of 20 mm, to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0111] b. preparation of a tear-resistant polyphenylene sulfide composite film

[0112] After the polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, a hot rolling treatment is performed, to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top and bottom layers and aramid short fibers as an intermediate layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0113] The top and bottom layers of the polyphenylene sulfide non-woven fabric are both 45 parts.

[0114] Example 8

[0115] A preparation method of a tear-resistant polyphenylene sulfide composite film, the preparation method being performed according to the following steps:

[0116] a. deposition treatment of aramid short fibers

[0117] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h, to obtain a dispersant for use, and 14 parts of aramid short fibers with a fiber length of 6 mm are placed in a fiber dissociator and dissociated at a speed of 5000 r / min for 10 min, and then the dispersant is stirred uniformly to obtain a suspension; the suspension is naturally settled on the upper surface of the polyphenylene sulfide non-woven fabric through a sieve with a mesh size of 80 and a mesh size of 20 mm, to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0118] b. preparation of a tear-resistant polyphenylene sulfide composite film

[0119] The polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment is performed, to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top and bottom layers and aramid short fibers as the middle layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0120] The top and bottom layers of the polyphenylene sulfide non-woven fabric are both 44 parts.

[0121] Example 9

[0122] A preparation method of a tear-resistant polyphenylene sulfide composite film, which is performed according to the following steps:

[0123] a. Deposition treatment of aramid short fibers

[0124] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3 parts of water, stirred at a speed of 450 rpm for 6 h, to obtain a dispersant for use, 16 parts of aramid short fibers with a fiber length of 6 mm are placed in a fiber dissociator and dissociated at a speed of 5000 r / min for 10 min, and then the dispersant is stirred uniformly to obtain a suspension; the suspension is naturally settled on the upper surface of the polyphenylene sulfide non-woven fabric through a sieve with a mesh size of 80 and a diameter of 20 mm, to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers.

[0125] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0126] The polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment is performed, to obtain a polyphenylene sulfide composite film with a three-layer composite structure of polyphenylene sulfide non-woven fabric as top and bottom layers and aramid short fibers as the middle layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0127] The top and bottom layers of the polyphenylene sulfide non-woven fabric are both 42 parts.

[0128] Example 10

[0129] A preparation method of a tear-resistant polyphenylene sulfide composite film, which is performed according to the following steps:

[0130] a. Deposition treatment of aramid short fibers

[0131] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3The polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment is performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of aramid short fibers as the middle layer and polyphenylene sulfide non-woven fabrics as the top layer and the bottom layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0132] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0133] The polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment is performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of aramid short fibers as the middle layer and polyphenylene sulfide non-woven fabrics as the top layer and the bottom layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0134] The top layer and the bottom layer of the polyphenylene sulfide non-woven fabric are both 41 parts.

[0135] Example 11

[0136] A tear-resistant polyphenylene sulfide composite film and a preparation method thereof, wherein the preparation method is performed according to the following steps:

[0137] a. Deposition treatment of aramid short fibers

[0138] 2.4 parts of polyethylene oxide and 0.4 parts of polyacrylamide are added to 1.6 x 10 3 The polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment is performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of aramid short fibers as the middle layer and polyphenylene sulfide non-woven fabrics as the top layer and the bottom layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0139] b. Preparation of a tear-resistant polyphenylene sulfide composite film

[0140] The polyphenylene sulfide non-woven fabric is covered on the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers prepared in step a, and then hot rolling treatment is performed to obtain a polyphenylene sulfide composite film with a three-layer composite structure of aramid short fibers as the middle layer and polyphenylene sulfide non-woven fabrics as the top layer and the bottom layer. The hot rolling temperature of the roller press is 200°C, the hot rolling pressure is 0.4 MPa, and the roller rolling linear speed is 3 m / min.

[0141] The top layer and the bottom layer of the polyphenylene sulfide non-woven fabric are both 40 parts.

[0142]

[0143]

[0144] From the above table, it can be seen that the relative content of aramid short fibers and polyphenylene sulfide will affect the performance of the composite film prepared by the above method.

[0145] The composite film prepared is also tested by electron microscope, Figure 2 It is observed that the polyphenylene sulfide non-woven fabric is in a disordered state; and the composite film prepared by the method provided can be seen that the polyphenylene sulfide non-woven fabric as the outer layer has basically lost the fiber state and formed a dense film structure, but there will still be a protruding fiber state structure from the film structure, which is aramid fiber, and the heat resistance and glass transition temperature of aramid fiber are much higher than those of polyphenylene sulfide, which can play the toughness and strength of aramid fiber in the composite film, thereby greatly improving the tear resistance of the composite film.

[0146] The above examples are only preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the concept of the present application, a number of changes, improvements and refinements can be made, and these changes, improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for producing a tear-resistant polyphenylene sulfide composite film, characterized by, It comprises the following steps: (a) depositing aramid short fibers onto the upper surface of a polyphenylene sulfide non-woven fabric to obtain a polyphenylene sulfide non-woven fabric loaded with aramid short fibers; (b) covering the upper surface of the polyphenylene sulfide non-woven fabric loaded with aramid short fibers with a polyphenylene sulfide non-woven fabric to form a three-layer composite structure with the polyphenylene sulfide non-woven fabric as the top and bottom layers and the aramid short fibers as the middle layer; (c) preparing a polyphenylene sulfide composite film by using a hot pressing process on the three-layer composite structure of step (b); In the step (a), the polyphenylene sulfide nonwoven fabric has a grammage of 20 to 200 g / m2 2 ; The mass fraction ratio of the top layer, middle layer and bottom layer of the polyphenylene sulfide composite film is (30-50):(5-15):(30-50); The method of step (a) for depositing aramid short fibers onto the upper surface of a polyphenylene sulfide non-woven fabric includes one of dry papermaking, electrostatic flocking, inclined screen papermaking and suction filtration; The hot pressing temperature is 180-200℃, the hot pressing pressure is 0.3MPa-0.4MPa, and the hot pressing roller speed is 3m / min-50m / min; The length of the aramid short fibers is less than 8mm.

2. A tear-resistant polyphenylene sulfide composite film prepared by the method of claim 1.

3. The tear-resistant polyphenylene sulfide composite film of claim 2, wherein The tear-resistant polyphenylene sulfide composite film is a three-layer composite structure; The three-layer composite structure has a polyphenylene sulfide non-woven fabric as the top and bottom layers and aramid short fibers as the middle layer; The mass fraction ratio of the top layer, middle layer and bottom layer of the polyphenylene sulfide composite film is (30-50):(5-15):(30-50).

4. The tear-resistant polyphenylene sulfide composite film of claim 3, wherein The polyphenylene sulfide composite film has a tear index of at least 50 mN·m 2 / g.

5. The tear-resistant polyphenylene sulfide composite film of claim 4, wherein The tensile strength of the tear-resistant polyphenylene sulfide composite film is at least greater than 150Mpa.

6. The tear resistant polyphenylene sulfide composite film of claim 5, wherein The bending strength of the tear-resistant polyphenylene sulfide composite film is at least greater than 240Mpa.

7. The tear resistant polyphenylene sulfide composite film of claim 6, wherein The tear-resistant polyphenylene sulfide composite film has an impact strength of at least 27 KJ / m 2 .

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