CN115747980A - A kind of preparation method and equipment of polyethylene monofilament - Google Patents

Abstract

The present application relates to the field of monofilament preparation, in particular to a preparation method of polyethylene monofilament and its equipment, wherein the method includes placing the extruded raw filament into a cooling water tank and cooling it in water at a temperature of 10-15°C; The solidified raw silk is pre-stretched for the first time; it is introduced into a hot water tank at 100°C for heating and softening for the second stretching; the raw silk is placed in the first hot oven for heating, and the temperature in the first hot oven After 160-180°C, the third stretching is carried out; the raw filament is placed in the second hot oven for heating, and the fourth stretching is carried out to obtain the finished monofilament. The present invention strengthens and toughens the monofilament through a multi-stage drawing process, adjusts spinning process parameters such as coagulation bath concentration, preheating bath temperature, and drafting ratio, and strictly controls the cross-sectional shape of the monofilament and the internal fine structure of the filament, so that the monofilament The structure and properties are optimized to obtain monofilament products with high toughness and low elongation.

Description

A kind of preparation method and equipment of polyethylene monofilament

technical field

The present application relates to the field of polyethylene monofilament preparation, in particular to a preparation method and equipment for polyethylene monofilament.

Background technique

Monofilament is a very distinctive variety among synthetic fibers. Its commonly used raw materials mainly include polyester (PET, PBT, PTT), polyamide (PA), polypropylene (PP), polyethylene (PE) and Polyurethane (TPU), polyether ester (TPEE), polyphenylene sulfide (PPS), etc., are widely used in zippers, toothbrushes, rackets, conveyor belts, ropes, fabrics, shoes and hats, and warp-knitted spacer fabrics according to functional production spacer layer etc. In terms of trawling in waters, cages, fence breeding and fishing lines, etc., the monofilament is required to have the characteristics of strong toughness, wear resistance, corrosion resistance, aging resistance, etc. The monofilament must have high purity, high strength, high density and Regular fiber surface structure. During the melt-spinning forming process of polyethylene monofilament, drafting treatment such as hot roll, hot plate, hot box, etc. is an important process. Drawing can make the macromolecules in polyethylene monofilament produce mechanical, optical, thermal anisotropy, and effectively improve the strength of chemical fibers. Controlling the physical properties of polyethylene monofilament by adjusting the processing method is a direction to obtain high-quality products.

In the melt spinning preparation method disclosed in the prior art, the strength of its ultra-high molecular weight polyethylene fiber is about 15-30cN/dtex, the elongation at break is 5-10%, and the viscosity-average molecular weight used is greater than 1 million. Ultra-high molecular weight polyethylene has high melt viscosity, almost no fluidity, low critical shear rate, prone to melt fracture, and poor processability.

Contents of the invention

In order to solve the deficiencies of the prior art, the application provides a polyethylene monofilament preparation method and its equipment to obtain a monofilament product with high strength and low elongation.

A preparation method of polyethylene monofilament, comprising the following steps:

Spinning the melted polyethylene chips to obtain pretreated raw silk;

Cool the pretreated raw silk in a water bath at 10-15°C;

Stretching the pretreated raw silk after cooling in a water bath for the first time;

Heat the pretreated raw silk after the first stretching in a water bath at 95-105°C;

Stretching the pretreated raw silk after heating in a water bath for the second time;

Carrying out the first heat treatment on the pretreated raw silk after the second drawing at 160-180°C;

Stretching the pretreated raw silk after the first heat treatment for the third time;

Carrying out the second heating treatment on the pretreated raw silk after the third drawing at 110-120°C;

The fourth stretching is carried out on the pretreated raw silk after the second heat treatment to obtain the finished monofilament.

By adopting the above technical scheme, the molten high molecular polyethylene extruded from the spinneret hole is stretched to make its molecular chain stretch along the stretching force direction, and under the transmission of the stretching force, the binding molecules and entanglement are changed. The knotted network structure realizes high-stretching and high-performance fibers. And further, the pretreated raw silk is quenched and solidified in a solidification bath, so that the macromolecules maintain an unwound structure, thereby controlling the orientation degree and regularity of the formed jelly silk, and further ensuring the tensile performance of the subsequent process. Finally, the multi-stage heating softening stretching process is used to prolong and ease the solidification process of the jelly silk, so that the internal and external shrinkage is synchronized, the internal stress is uniform, and the appropriate temperature and multiple heating and drawing are beneficial to the pretreatment of the raw silk. Drawing orientation, controlling the appropriate crystallinity of the pretreated raw yarn, so that the tensile strength of the finished monofilament can reach more than 8cN/dtex, and the elongation at break is less than 15%, which can meet the requirements of fishing net yarn.

Preferably, the first stretching ratio is 3 to 5 times; the second stretching ratio is 3 to 4 times; the third stretching ratio is 1 to 2 times, and the second stretching ratio is 1 to 2 times. The magnification of the four stretches is 2 to 3 times.

By adopting the above-mentioned technical scheme, along with the change of the drawing ratio, the structural orientation arrangement of the pretreated raw yarn becomes more dense during the drawing process, and the mechanical properties change from soft to tough.

Preferably, the polyethylene chips are produced by the following steps:

1) Mix 5-8 parts of cristobalite powder, 0.1-1.5 parts of a mixture of tetraethoxysilane and tetra-n-propyl zirconate, and 0.1-1.5 parts of oxidized paraffin wax soap at 55-65 ° C to prepare Surface modified cristobalite powder;

2) mixing surface-modified cristobalite powder, 70-90 parts of polyethylene and auxiliary agents to obtain a spinning masterbatch;

3) Melting and extruding the spinning masterbatch under the condition of 160-220° C. to obtain the polyethylene chips.

By adopting the above-mentioned technical scheme, the surface-modified cristobalite and polyethylene are fully mixed and dispersed. After co-extrusion and granulation, not only can the product material cost be reduced, but also the cristobalite powder can absorb and disperse impact energy to a certain extent, improving poly The impact toughness of vinyl monofilament, while strengthening and toughening the effect.

Preferably, in the process of the second stretching, a toughening aid is added to the pretreated raw silk, and the toughening aid includes polyamide resin, polyacrylic resin, polyvinyl acetate resin, polymer At least one of the gel materials; the monofilament includes a porous polyethylene skin layer, and a toughening assistant is bonded between the pores of the porous polyethylene skin layer.

By adopting the above technical scheme, the toughening agent is used to bond and strengthen the void structure of the porous polyethylene skin layer, transform the loose structure into a tough structure connected by internal fulcrums, and improve the mechanical properties of the finished monofilament.

Preferably, the toughening aid adopts dimer acid type polyamide resin particles with a particle size of 1-10 microns.

By adopting the above technical solution, the dimer acid type polyamide resin particles are bonded with the inner structure of the polyethylene skin layer to form a three-dimensional hole structure during the heating of the subsequent process, so that the monofilament has higher toughness under the same diameter.

Preferably, the toughening aid also includes carbon fiber powder or inorganic particle filler.

By adopting the above technical solution, the carbon fiber powder or inorganic particle filler improves the wear resistance and cut resistance of the monofilament.

Preferably, the polyethylene chips have a weight average molecular weight of 400,000-600,000.

By adopting the above technical solution, compared with ultra-high molecular weight polyethylene exceeding 1.5 million, polyethylene with a weight average molecular weight of 400,000-600,000 has better processability.

A device used in the method as described above, comprising a wire outlet cooling unit and a stretching and toughening unit, the wire outlet cooling unit includes a fuselage assembly, a cooling water tank is provided in the fuselage assembly, and a connecting seat is provided on the side wall of the cooling water tank , the connection seat is used to directly connect the wire head of the extrusion equipment. The right side of the connection seat is provided with the first guiding device, the first drafting roller device and the wire tray in sequence. The stretching and toughening unit includes hot water The water tank, the hot water tank is equipped with a second guide device, and the right side of the second guide device is provided with a second drafting roller device, a toughening device, a first heating oven, and a third drafting roller device , The second heat oven, the fourth drafting roller device, the oil passing device and the retracting device, and the toughening device is equipped with an auxiliary agent attachment mechanism.

By adopting the above technical scheme, the wire outlet cooling unit guides the pretreated raw wire flowing out of the wire outlet head into the stretching and toughening unit through the first guiding device, the first drafting roller device and the wire passing tray, and the stretching and toughening After the first heating of the hot water tank in the unit, multi-stage stretching is carried out in the second to fourth drafting roller devices and the first to second hot ovens, and finally high-performance unit is obtained with the assistance of toughening devices. Silk products.

Preferably, the second drafting roller device includes a second drafting roller, and a thread sweeping mechanism is arranged on the roller surface of the second drafting roller, and the thread sweeping mechanism is used to sweep and touch the surface of the pretreated raw silk.

By adopting the above technical solution, the thread sweeping mechanism is used to sweep away the remaining toughening aids on the surface of the pretreated raw silk, so as to keep the surface of the pretreated raw silk smooth.

Preferably, the first guiding device includes a first connecting arm and a first guiding plate, a first rotating mechanism is provided on the upper part of the first connecting arm, a first lifting mechanism is provided on the first connecting arm, and the first guiding plate Connect the first lift mechanism.

By adopting the above-mentioned technical solution, the first rotating mechanism and the first lifting mechanism are adjusted, and the traction force exerted by the first guiding device on the pretreated raw yarn is changed, the precision of the equipment is improved, and the tensile performance of the monofilament is controlled.

Preferably, a walking assembly is provided at the bottom of the fuselage assembly.

By adopting the above technical solution, the walking assembly enables the cooling unit of the outlet wire to cooperate with different stretching and toughening units, so as to produce different types of monofilament products, which improves the practicability of the equipment.

Preferably, a lifting assembly is provided between the fuselage assembly and the running assembly.

By adopting the above technical solution, the lifting assembly is used to adjust the wire outlet angle of the wire outlet cooling unit, and control the front stretching effect of the pretreated raw yarn.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The present invention adopts the direct silk spinning method, and directly carries out the water-bath cooling drawing spinning operation after the raw silk is pretreated out of the extrusion equipment, which can not only reduce the process, but also suppress the quality fluctuation of the monofilament to obtain a small variation rate High tenacity monofilament finished products.

2. The present invention further forms a three-dimensional toughening structure by bonding dimer acid type polyamide resin with good flexibility and high cohesiveness inside the cortex of irregular porous structure to disperse the circumferential surface tensile stress when the monofilament is bent, Improve monofilament mechanical properties.

3. The process of the present invention is simple, eliminating the need for stranding, twisting, dipping and other processes; the monofilament made of polyethylene raw materials with a molecular weight of less than 1 million has high toughness, low elongation and good wear resistance, and is suitable for Used for all kinds of fishing lines, fishing screens, processed gillnets, safety nets and special steel cables, etc.

4. The wire drawing and toughening equipment of the present invention realizes the processing processes such as stretching, splitting, cooling, drying, and toughening of monofilament through the wire outlet cooling unit and the stretching toughening unit. The equipment has a compact structure and a reasonable layout , easy to use.

Description of drawings

Figure 1 is a schematic diagram of the device structure of the present application.

Explanation of reference numerals: 1. Silk outlet cooling unit; 2. Tensile toughening unit; 3. Fuselage assembly; 4. Cooling water tank; 41. Water inlet valve; 42. Overflow port; 5. Connecting seat; 6. The first guiding device; 61, the first connecting arm; 62, the first guiding disc; 63, the first rotating mechanism; 64, the first lifting mechanism; 7, the thread passing tray; 8, the first drafting roller device ; 81, the second connecting arm; 82, the first drafting roller; 83, the second rotating mechanism; 84, the second lifting mechanism; 9, the hot water tank; 10, the second guiding device; 11, the second road 12. The first heat oven; 13. Toughening device; 14. The third draft roller device; 15. The second heat oven; 16. The fourth draft roller device; 17. Oil device; 18, retracting device.

Detailed ways

In order to better understand the present invention, the content of the present invention will be further clearly described below in conjunction with the accompanying drawings and embodiments, but the protection content of the present invention is not limited to the following embodiments. In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention.

Now the raw materials used in embodiment and comparative example are described as follows:

Polyethylene (HDPE), grade 5000S, PetroChina Daqing Petrochemical Company; the specific weight average molecular weight of polyethylene for this application can be selected from 400,000 to 600,000.

Cristobalite powder, Donghai County Fucai Mineral Products Co., Ltd.

Tetraethoxysilane, CAS No. 78-10-4, Hubei Coward Chemical Co., Ltd., industrial grade.

Tetra-n-propyl zirconate, CAS No. 23519-77-9, Hubei Yongkuo Technology Co., Ltd., industrial grade.

Oxidized paraffin soap, Wuhan Jiyesheng Chemical Co., Ltd., industrial grade.

Anhydrous ethanol, Jinan Century Tongda Chemical Co., Ltd., industrial grade.

Phenolic antioxidant, CAS No. 128-37-0, Hubei Ferry Chemical Co., Ltd., industrial grade.

Calcium stearate, CAS No. 1592-23-0, Jinan Century Tongda Chemical Co., Ltd., industrial grade.

Dimer acid polyamide resin, TECHNOMELT PA6239, Henkel, Germany.

Polyethylene oxide, CAS No. 68441-17-8, Hubei Qifei Pharmaceutical Chemical Co., Ltd.

Example 1

A kind of preparation method of polyethylene monofilament of the present application, comprises the following steps:

Take polyethylene with a weight-average molecular weight of 550,000, add 0.1wt% of antioxidant 1098 and 0.1% of ethylene wax, blend it, melt it at 125°C, introduce it into the composite spinning pack, and extrude to obtain pretreated raw silk; pretreated raw silk Enter the cooling water tank 4, cool and solidify and crystallize in water at a temperature of 10°C for 1.5 minutes; the pretreated raw silk after cooling and solidifying in the water tank is pulled out of the water surface at a uniform speed by the first drafting roller 82, and is stretched for the first time. The drafting speed is 1.8 m/min, and the draw ratio is 3.5 times; the pretreated raw silk after the first stretching is sent to a 100°C hot water tank for heating again, which can soften the pretreated raw silk, and then the pretreated raw silk is stretched by the second drafting roller. Treat the raw silk and carry out the second stretching, can further thin the pretreatment raw silk, the drawing speed of the second stretching is 35m/min, and the draw ratio is 4 times; The pretreatment raw silk after the second stretching The silk is sent into the first hot oven 12 at 160°C for heating, and the length of the heating interval is 80cm; 25m/min, the draw ratio is 1.5 times, and then sent to the second hot oven 15 at 110°C for sizing for 55s; Stretching, the drafting speed is 20m/min, and the draw ratio is 2.5 times to obtain the finished monofilament, which is evenly wound on the pan head after passing through the oil tank.

As shown in Figure 1, the equipment used in the above-mentioned method of the present application includes a wire outlet cooling unit 1 and a stretch toughening unit 2, and the wire outlet cooling unit 1 includes a fuselage assembly 3, and inside the fuselage assembly 3 A cooling water tank 4 is provided. The cooling water tank 4 is provided with a water inlet valve 41 and an overflow port 42. The side wall of the cooling water tank 4 is provided with a connecting seat 5. The connecting seat 5 is used to directly connect the wire outlet head of the extrusion equipment. The connecting seat 5 The right side is provided with the first guiding device 6, the first drafting roller device 8 and the wire passing tray 7 in sequence, the first guiding device 6 includes the first connecting arm 61 and the first guiding plate 62, the first connecting arm The upper part of the arm 61 is provided with a first rotating mechanism 63 , the first connecting arm 61 is provided with a first lifting mechanism 64 , and the first guide plate 62 is connected with the first lifting mechanism 64 . The first drafting roller device 8 includes a second connecting arm 81 and a first drafting roller 82, the second connecting arm 81 is provided with a second rotating mechanism 83, and the second connecting arm 81 is provided with a second lifting mechanism 84, The first drafting roller 82 is connected to the second lifting mechanism 84 . The tensile toughening unit 2 includes a hot water tank 9, a second guide device 10 is arranged in the hot water tank 9, and the second guide device 10 is provided with a second drafting roller device 11, a first draft roller device, and Heat oven 12, third drafting roller device 14, second thermal oven 15, fourth drafting roller device 16, oil passing device 17 and take-up device 18. The bottom of the fuselage assembly 3 is equipped with a walking assembly, which enables the cooling unit of the wire outlet to cooperate with different stretching and toughening units, thereby producing different types of monofilament products and improving the practicability of the equipment. A lifting assembly is arranged between the fuselage assembly 3 and the traveling assembly, and the lifting assembly is used to adjust the wire outlet angle of the wire outlet cooling unit and control the front stretching effect of the monofilament.

Working principle: the first guiding device 6 guides the pretreated raw yarn from the head of the extruder into the water area of the cooling water tank 4 for cooling, and the first drafting roller device 8 pulls the cooled pretreated raw yarn out of the water area, Further, at this time, a shower device can also be arranged above the pretreated raw silk for further cooling. At the same time, the tension degree and draw ratio of the pretreated raw silk can be adjusted by controlling the swing and lift of the first guiding device 6 and the first drafting roller device 8 . Then the pretreated raw silk passes through the hot water tank 9, the second guiding device 10, the second drafting roller device 11, the first thermal oven 12, the third drafting roller device 14, and the second thermal oven 15. 1. After the stretching and shaping of the fourth drafting roller device 16, it is wound up at the winding device 18.

Example 2

The difference between the preparation method and equipment of a polyethylene monofilament of the present embodiment 2 and the embodiment 1 is only that: the ratio of the first stretching is 3 times; the second stretching ratio is 3 times; The magnification of the third stretching is 1 time, and the magnification of the fourth stretching is 2 times.

Example 3

The difference between the preparation method and equipment of a kind of polyethylene monofilament of this embodiment 3 and embodiment 1 is only: the magnification of the first stretching is 4.2 times; The second stretching magnification is 3.5 times; The magnification of the third stretching is 1.5 times, and the magnification of the fourth stretching is 2.5 times.

Example 4

The difference between the preparation method and equipment of a kind of polyethylene monofilament of this embodiment 4 and embodiment 1 is only: the magnification of the first stretching is 5 times; The second stretching magnification is 4 times; The magnification of the third stretching is 2 times, and the magnification of the fourth stretching is 3 times.

Example 5

The difference between the preparation method and equipment of a kind of polyethylene monofilament of present embodiment 5 and embodiment 4 is only:

Polyethylene chips are produced by the following steps:

1) Disperse 7 parts of cristobalite powder with a particle size of 25nm, 1 part of tetraethoxysilane and tetra-n-propyl zirconate with a mass ratio of 2:1, and 0.5 parts of oxidized paraffin wax soap in 30 parts of anhydrous Mixing reaction with ethanol, drying absolute ethanol to obtain surface-modified cristobalite powder;

2) uniformly mix surface-modified cristobalite powder with 90 parts of polyethylene with a weight average molecular weight of 550,000, 0.01 part of phenolic antioxidant, and 0.01 part of heat stabilizer calcium stearate to obtain a spinning masterbatch;

3) Extrude the spinning masterbatch at 180° C. into strips, cool, and finally pelletize to make the polyethylene chips.

Example 6

The difference between the preparation method and equipment of a kind of polyethylene monofilament of present embodiment 6 and embodiment 5 is only:

While stretching the pretreated precursor for the second time, add 7.5 parts of toughening aids to the pretreated precursors, the toughening aid is a dimer acid type polyamide resin with an average particle diameter of 2 microns; the monofilament includes porous The polyethylene skin layer has dimer acid type polyamide resin particles bonded between the pores of the porous polyethylene skin layer.

The preparation method of a kind of polyethylene monofilament of the present application of this embodiment 6, the difference of specific preparation steps and embodiment 5 only lies in:

Take the polyethylene chip prepared in Example 5, add 0.1wt% of antioxidant 1098 and 0.1% of ethylene wax to blend, and then melt and extrude at 125°C to form a core layer melt. 30 parts of polyethylene chips, 15 parts of polyethylene oxide, and 5 parts of calcium carbonate made in Example 5 are melted to make the skin layer melt, and the inner layer of the polyethylene skin can be treated by controlling the content of polyethylene oxide and calcium carbonate. Pore size and shape can be effectively regulated. The melted core layer melt and the skin layer melt are respectively introduced into the composite spinning assembly, and the ratio of the core layer to the skin layer is 2:1. After passing through the spinneret hole, it is backlogged into pretreated raw silk from the screw extruder The spinneret mouth flows out, and the thickness of the cortex is 35 microns; the pretreated raw silk enters the cooling water tank 4, and is rapidly cooled, solidified and crystallized in the water; , for the first stretching; after the first stretching, the pretreated raw silk is impregnated with hydrochloric acid solution, and the pretreated raw silk cortex generates irregular three-dimensional holes with a pore size of 5 microns, which are sent to a hot water tank at 100°C for further processing. Heating and softening, and then the pretreated raw silk is stretched and thinned for the second time by the second drafting roller. During the second stretching, the toughened dimer acid type polyamide resin particles are attached to make the dimer acid type polyamide resin particles The amide resin particles enter the gap of the pretreated raw silk cortex; the pretreated raw silk after the second stretching is sent to the first hot oven 12 at 160 ° C for heating; the pretreated raw silk coming out of the first hot oven 12 The silk is stretched for the third time by the third drafting roller, and then sent to the second hot oven 15 at 110°C for shaping; the pretreated raw silk coming out of the second hot oven 15 is drawn by the fourth drafting roller, The finished monofilament is obtained, and the monofilament is evenly wound on the pan head after passing through the oil tank.

As shown in Figure 1, the equipment used in the above-mentioned method of the present application differs from that of Embodiment 5 only in that a toughening device is also arranged between the second drafting roller device 11 and the first thermal oven 12 13. The toughening device 13 is equipped with an auxiliary agent attachment mechanism. The third drafting roller device 14 includes a third drafting roller, and a thread sweeping mechanism is arranged on the roller surface of the third drafting roller, and the thread sweeping mechanism is used to sweep and touch the surface of the pretreated raw silk.

Working principle: the first guiding device 6 guides the pretreated raw yarn from the head of the extruder into the water area of the cooling water tank 4 for cooling, and the first drafting roller device 8 pulls the cooled pretreated raw yarn out of the water area, Further, at this time, a shower device can also be arranged above the pretreated raw silk for further cooling. At the same time, the tension degree and draw ratio of the pretreated raw silk can be adjusted by controlling the swing and lift of the first guiding device 6 and the first drafting roller device 8 . Then after passing through the hot water tank 9, the second guide device 10, the second drafting roller device 11, and the first thermal oven 12, in the stretched state of the second drafting roller device 11, the auxiliary agent The attachment mechanism is filled with toughening additives. The toughening additives can be liquid or solid. After filling the toughening agent, the second drafting roller and the sweeping mechanism work together to remove the redundant particles on the surface of the pretreated raw silk, and the pretreated raw silk passes through the third drafting roller device 14 and the second heating oven 15 1. After the stretching and shaping of the fourth drafting roller device 16, it is wound up at the winding device 18.

Example 7

The difference between the preparation method and equipment of a polyethylene monofilament in Example 7 and Example 6 is that the average particle size of the dimer acid type polyamide resin is 1 micron.

Example 8

The difference between the preparation method and equipment of a polyethylene monofilament in Example 8 and Example 6 is that the average particle size of the dimer acid type polyamide resin is 3 microns.

Example 9

The difference between the preparation method and equipment of a polyethylene monofilament in Example 9 and Example 7 is that the toughening aid also contains 3 parts of carbon fiber powder, and the average particle size of the carbon fiber powder is 1.5 microns.

Comparative example 1

A polyethylene monofilament, the preparation method is as follows:

(1) Take polyethylene with a weight-average molecular weight of 550,000, add 0.1-0.3wt% of antioxidant 1098 and 0.1% of ethylene wax and blend it, then melt it at 125°C and introduce it into the composite spinning pack to extrude into pretreated raw silk outflow ;

(2) use spinning machine to carry out spinning;

(3) Three-stage thermal stretching, the stretching temperature is 100-155 degrees, and the total stretching ratio is 10 times.

Experimental data

The polyethylene monofilaments prepared in the above-mentioned various examples and comparative examples were tested for mechanical properties respectively, and part of the test methods were carried out in accordance with "GB/T14344-2008 Experimental method for tensile properties of chemical fiber filaments", and the obtained polyethylene monofilaments were tested at the same time. The wear resistance of silk under a known pressure (10N) is rubbed 500 times (broken - poor, stray yarn - fair, whitish - good, only scratches - excellent), the results are shown in Table 1.

Table 1

As can be seen from Table 1, as shown in the test results of Examples 1-4, the breaking strength and elongation at break of the high molecular weight polyethylene monofilament prepared by the processing method of the present application are closer to ultra-high molecular weight than the existing preparation method The performance of polyethylene monofilament, and after adopting special polyethylene raw material and toughening process, the performance of the polyethylene monofilament of this application in breaking strength, elongation at break, wear resistance and other physical properties is better than the existing product.

It should be understood that the specific embodiments described above are only used to explain the present invention, not to limit the present invention. Obvious changes or variations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (10)

1. a preparation method of polyethylene monofilament, is characterized in that comprising the following steps: Spinning the melted polyethylene chips to obtain pretreated raw silk; Cool the pretreated raw silk in a water bath at 10-15°C; Stretching the pretreated raw silk after cooling in a water bath for the first time; Heat the pretreated raw silk after the first stretching in a water bath at 95-105°C; Stretching the pretreated raw silk after heating in a water bath for the second time; Carrying out the first heat treatment on the pretreated raw silk after the second drawing at 160-180°C; Stretching the pretreated raw silk after the first heat treatment for the third time; Carrying out the second heating treatment on the pretreated raw silk after the third drawing at 110-120°C; The fourth stretching is carried out on the pretreated raw silk after the second heat treatment to obtain the finished monofilament. 2. The preparation method of polyethylene monofilament according to claim 1, characterized in that: the first stretching ratio is 3 to 5 times; the second stretching ratio is 3 to 4 times; The magnification of the third stretching is 1 to 2 times, and the magnification of the fourth stretching is 2 to 3 times. 3. the preparation method of polyethylene monofilament according to claim 1 is characterized in that, described polyethylene chip is made by the following steps: Mix 5-8 parts of cristobalite powder, 0.1-1.5 parts of a mixture of tetraethoxysilane and tetra-n-propyl zirconate, and 0.1-1.5 parts of oxidized paraffin wax soap at 55-65 ° C to prepare a surface modification cristobalite powder; Mix surface-modified cristobalite powder, 70-90 parts of polyethylene and auxiliary agents to obtain spinning masterbatch; The spinning masterbatch is melted and extruded under the condition of 160-220° C. to obtain the polyethylene chips. 4. the preparation method of polyethylene monofilament according to claim 1 is characterized in that: in the process of described second stretching, in pretreatment raw silk, add toughening auxiliary agent, described toughening auxiliary agent It includes at least one of polyamide resin, polyacrylic resin, polyvinyl acetate resin, and polymer gel material; the monofilament includes a porous polyethylene skin layer, and the pores of the porous polyethylene skin layer are bonded to increase toughening agent. 5 . The preparation method of polyethylene monofilament according to claim 4 , characterized in that: the toughening aid is dimer acid type polyamide resin with a particle size of 1-10 microns. 6 . The preparation method of polyethylene monofilament according to claim 4 , characterized in that: the toughening aid also includes carbon fiber powder or inorganic particle filler. 7 . 7. The preparation method of polyethylene monofilament according to claim 1, characterized in that: the weight average molecular weight of the polyethylene chips is 400,000-600,000. 8. A kind of equipment that is used for the preparation method of the polyethylene monofilament described in any one of claim 1-7, it is characterized in that: comprise outlet cooling unit and drawing toughening unit, the outlet cooling unit comprises fuselage Assembly, the body assembly is equipped with a cooling water tank, the side wall of the cooling water tank is provided with a connecting seat, the connecting seat is used to connect the wire outlet head of the extrusion equipment, and the right side of the connecting seat is provided with the first guiding device, The first drafting roller device and wire-passing tray, the stretching and toughening unit includes a hot water tank, a second guiding device is installed in the hot water tank, and the second drafting device is arranged in sequence on the right side of the second guiding device Roller device, toughening device, the first heating oven, the third drafting roller device, the second heating oven, the fourth drafting roller device, oiling device and take-up device, the toughening device is equipped with additives attachment mechanism. 9. The equipment used for the preparation method of polyethylene monofilament according to claim 8, characterized in that: the second drafting roll device comprises a second drafting roll, the roll surface of the second drafting roll There is a thread sweeping mechanism on the top, which is used to sweep and touch the surface of the pretreated raw silk. 10. The equipment used in the preparation method of polyethylene monofilament according to claim 8, characterized in that: the first guiding device comprises a first connecting arm and a first guiding plate, and the upper part of the first connecting arm is provided with The first rotating mechanism, the first connecting arm is provided with a first lifting mechanism, and the first guide plate is connected to the first lifting mechanism.

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