High-temperature-resistant ultra-high molecular weight polyethylene fiber and preparation method thereof

Abstract

The invention belongs to the technical field of ultra-high molecular weight polyethylene, and particularly relates to a high-temperature-resistant ultra-high molecular weight polyethylene fiber and a preparation method thereof.The preparation method comprises the following steps that an aluminate coupling agent, a processing aid and halloysite nanotubes are mixed and put into a double-screw extruder to be subjected to extrusion granulation, and a binary blended composite material is obtained; mixing the binary blended composite material with polycarbonate particles, then adding a processing aid, a dispersing agent, graphene and ultra-high molecular weight polyethylene, uniformly mixing, putting into a twin-screw extruder, extruding, and cooling to obtain the high-temperature-resistant ultra-high molecular weight polyethylene fiber, the thermal deformation temperature of the high-temperature-resistant ultra-high molecular weight polyethylene fiber reaches 131 DEG C, the high-temperature-resistant ultra-high molecular weight polyethylene fiber shows good high temperature resistance, the thermal decomposition finishing temperature is 540.8 DEG C, good thermal stability is shown, and the application field of the ultra-high molecular weight polyethylene fiber is expanded.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-high molecular weight polyethylene, and in particular relates to a high temperature resistant ultra-high molecular weight polyethylene fiber and a preparation method thereof. Background Art

[0002] Ultra-high molecular weight polyethylene fiber is a fiber spun from polyethylene with a molecular weight of 1 million to 5 million. Due to its high specific strength and high specific modulus, the specific strength of polyethylene fiber is more than ten times that of steel wire with the same cross-section, and its specific modulus is second only to special carbon fiber. It plays a pivotal role in the fields of aviation, aerospace, and marine defense equipment.

[0003] The melting point of ultra-high molecular weight polyethylene fiber is relatively low, only around 130°C, and the thermal aging rate of ultra-high molecular weight polyethylene fiber under stretching conditions is relatively fast, so its maximum operating temperature is generally between 80-100°C, which limits its application in high temperature environments.

[0004] In order to improve its high temperature resistance, a common method is to add high temperature resistant fillers, such as alumina, therein. Application publication number CN 118065025 A discloses a high temperature resistant ultra-high molecular weight polyethylene fiber-alumina fiber composite yarn and a preparation method thereof, comprising the following steps: 1. rolling an aluminum foil material into fine particles; adding nano-carbon powder and fine aluminum foil particles to a polyimide epoxy resin to obtain a mixed adhesive; 2. immersing the ultra-high molecular weight polyethylene fiber treated with corona discharge into the mixed adhesive prepared in step 1, taking it out, placing it in an oven for drying, and then placing it at room temperature for more than 1 hour to obtain a composite ultra-high molecular weight polyethylene fiber; 3. Using the composite ultra-high molecular weight polyethylene fiber as a core yarn and the alumina fiber as an outer yarn, a high temperature resistant ultra-high molecular weight polyethylene fiber-alumina fiber composite yarn is prepared by a friction spinning machine. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high temperature resistant ultra-high molecular weight polyethylene fiber and a preparation method thereof, so as to improve the high temperature resistance thereof.

[0006] The embodiment of the present invention provides a method for preparing high temperature resistant ultra-high molecular weight polyethylene fiber, comprising the following steps: The aluminate coupling agent, the processing aid and the halloysite nanotubes are mixed and put into a twin-screw extruder for extrusion granulation to obtain a binary blended composite material; The binary blended composite material and polycarbonate particles are mixed, and then a processing aid, a dispersant, graphene and ultra-high molecular weight polyethylene are added, mixed evenly, put into a twin-screw extruder for extrusion, and cooled to obtain high temperature resistant ultra-high molecular weight polyethylene fibers.

[0007] Preferably, the processing aid is polyethylene wax.

[0008] Preferably, the weight ratio of the aluminate coupling agent, the processing aid and the halloysite nanotubes is 5-5.5:1-1.2:18-20.

[0009] Preferably, the weight ratio of the ultra-high molecular weight polyethylene to the polycarbonate particles is 85-90:15-10.

[0010] Preferably, the weight ratio of the binary blended composite material to the polycarbonate particles is 1-1.2:1-1.2.

[0011] Preferably, the weight ratio of the ultra-high molecular weight polyethylene to graphene is 100:1-2.

[0012] Preferably, the dispersant is a dendritic polymer dispersant.

[0013] Preferably, the weight ratio of the ultra-high molecular weight polyethylene to the dendritic polymer dispersant is 100:1-2.

[0014] Preferably, the halloysite nanotubes are pre-dried and crushed at a temperature of 75-80°C, and the polycarbonate particles are pre-crushed and dried at a temperature of 70°C.

[0015] The embodiment of the present invention provides a high temperature resistant ultra-high molecular weight polyethylene fiber, which is prepared by adopting the preparation method.

[0016] The beneficial effect of the present invention is that the heat deformation temperature of the high-temperature resistant ultra-high molecular weight polyethylene fiber prepared by the present invention reaches 131°C, showing good high-temperature resistance, and the thermal decomposition end temperature is 540.8°C, showing good thermal stability, thereby expanding the application field of the ultra-high molecular weight polyethylene fiber. DETAILED DESCRIPTION

[0017] Example 1 A method for preparing high temperature resistant ultra-high molecular weight polyethylene fiber comprises the following steps: 1. Preparation of binary blended composite materials 1) Drying HNTs (halloysite nanotubes) at 80 °C for 3 h, and crushing the HNTs; 2) Put the processing aid polyethylene wax, the crushed HNTs and the aluminate coupling agent into a twin-screw extruder for extrusion granulation.

[0018] The weight ratio of the aluminate coupling agent, the processing aid and the halloysite nanotube is 5-5.5:1-1.2:18-20.

[0019] 2. Preparation of HNTs / PC / UHMWPE Materials 3) The PC particles (polycarbonate) were crushed in advance and then placed in a drying oven for drying at a temperature of 70°C for 4 h; 4) After the PC particles are dried, take out the dried PC, add it into the binary blended composite material, and then mix it evenly to obtain a PC / HNTs blend system; 5) Polyethylene wax, dendritic polymer dispersant, 1% by mass of graphene dispersion and a certain amount of UHMWPE are added to the PC / HNTs blending system, and after being fully mixed, a strip-shaped composite is extruded under the action of a twin-screw extruder, and the strip-shaped mixture is placed in water for cooling to obtain a PC / HNTs / UHMWPE blending composite.

[0020] The weight ratio of the ultra-high molecular weight polyethylene to the polycarbonate particles is 85-90:15-10, the weight ratio of the binary blended composite material to the polycarbonate particles is 1-1.2:1-1.2, the weight ratio of the ultra-high molecular weight polyethylene to graphene is 100:1-2, and the weight ratio of the ultra-high molecular weight polyethylene to the dendritic polymer dispersant is 100:1-2.

[0021] The granulation process table of step 2) is as follows:

[0022] The extrusion process table of step 5) is:

[0023] The heat deformation temperature and thermal decomposition end temperature of Example 1 were measured, and the heat deformation temperature was 131°C, and the thermal decomposition end temperature was 540.8°C, which showed good high temperature resistance and thermal stability, and expanded the application field of ultra-high molecular weight polyethylene fiber.

[0024] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0025] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing high temperature resistant ultra-high molecular weight polyethylene fiber, characterized in that: The steps include: The aluminate coupling agent, the processing aid and the halloysite nanotubes are mixed and put into a twin-screw extruder for extrusion granulation to obtain a binary blended composite material; The binary blended composite material and polycarbonate particles are mixed, and then a processing aid, a dispersant, graphene and ultra-high molecular weight polyethylene are added, mixed evenly, put into a twin-screw extruder for extrusion, and cooled to obtain high temperature resistant ultra-high molecular weight polyethylene fibers.

2. The preparation method according to claim 1, characterized in that: The processing aid is polyethylene wax.

3. The preparation method according to claim 1, characterized in that: The weight ratio of the aluminate coupling agent, the processing aid and the halloysite nanotube is 5-5.5:1-1.2:18-20.

4. The preparation method according to claim 1, characterized in that: The weight ratio of the ultra-high molecular weight polyethylene to the polycarbonate particles is 85-90:15-10.

5. The preparation method according to claim 1, characterized in that: The weight ratio of the binary blended composite material to the polycarbonate particles is 1-1.2:1-1.

2.

6. The preparation method according to claim 1, characterized in that: The weight ratio of the ultra-high molecular weight polyethylene to graphene is 100:1-2.

7. The preparation method according to claim 1, characterized in that: The dispersant is a dendritic polymer dispersant.

8. The preparation method according to claim 7, characterized in that: The weight ratio of the ultra-high molecular weight polyethylene to the dendritic polymer dispersant is 100:1-2.

9. The preparation method according to claim 7, characterized in that: The halloysite nanotubes are dried and crushed in advance at a drying temperature of 75-80°C, and the polycarbonate particles are crushed and dried in advance at a drying temperature of 70°C.

10. A high temperature resistant ultra-high molecular weight polyethylene fiber, characterized in that: The preparation is obtained by the preparation method according to any one of claims 1 to 9.

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