Process route for preparing high-cutting-resistance polyethylene yarn through melt spinning

Abstract

The invention discloses a process route for preparing high-cutting-resistance polyethylene yarn through melt spinning, which comprises the following steps: modifying ultrahigh molecular weight polyethylene powder to obtain powder 1; wherein the molecular weight range of the ultra-high molecular weight polyethylene powder is 100,000-1,000,000 (GB / T 32679-2016), the density of the modified ultra-high molecular weight polyethylene powder is 0.3 g / cm < 3 >-1.0 g / cm < 3 >, and the density of the powder refers to melt density; the modification method is one or more of physical coating, chemical coating and high-energy surface modification, including but not limited to infrared, plasma irradiation, electron beam radiation, various coupling agents such as high polymers, silane and the like or surfactants and the like. One or more of the mineral fibers, the superfine nanoscale micro powder, the aerogel micro powder and the toner are added, the additives are subjected to modification treatment, and the functionality of the polyethylene fibers prepared through melt spinning is improved by means of the characteristics of the additives.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene yarn processing, and more specifically to a process route for preparing highly cut-resistant polyethylene yarn by melt spinning. Background Art

[0002] In production safety accidents, the occurrence of cut injuries cannot be ignored, such as in the automobile manufacturing, metal product processing, glass processing, livestock slaughtering and cutting industries. The use of cut-resistant labor protection tools is an important means for relevant practitioners to avoid injuries. With the rapid development of my country's ultra-high molecular weight polyethylene (UHMWPE) fiber industry and the continuous growth of the industry scale, UHMWPE fiber has been widely used in the military field (such as personal protection such as bulletproof vests and bulletproof helmets, armored protection such as tanks, ships, helicopters, etc.) and the industrial sector (marine ropes, fishery farming, sports equipment, radar covers, cut-resistant fabrics, etc.) due to its excellent performance.

[0003] However, the production process of conventional ultra-high molecular weight polyethylene fibers is mostly gel spinning. Due to the pressure of recycling, extraction and production, the cost remains high, and the cut-resistant grade of UHMWPE fibers is generally A2. The development of the application field of the cut-resistant fabric market is slow. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the problems existing in the prior art, the present invention provides a process route for preparing highly cut-resistant polyethylene yarn by melt spinning to solve the technical problems mentioned in the background technology.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a process route for preparing high-cut-resistant polyethylene yarn by melt spinning, comprising the following steps:

[0008] Step 1: modifying the ultra-high molecular weight polyethylene powder to obtain powder 1; the modification method is one or more of physical coating, chemical coating, and high-energy surface modification, including but not limited to infrared, plasma irradiation, electron beam radiation, polymers, and various silane coupling agents or surfactants;

[0009] Step 2: Select one or more of mineral fiber, ultrafine nano-powder, aerogel powder, and color powder, and perform mechanical processing on them to obtain a mixture with a suitable particle size, which is the additive 1;

[0010] Step 3: According to the set dual feed port mode, loss-in-weight scale 1 automatically feeds powder 1, and loss-in-weight scale 2 automatically feeds additive 1;

[0011] Step 4: The addition ratio of powder 1 and additive 1 is controlled by different feeding speeds using a loss-in-weight scale;

[0012] Step 5: The powder 1 and the auxiliary agent 1 are automatically fed according to the set process parameters, and transported to the twin-screw extruder for further mixing and homogenization to obtain a uniform fiber spinning solution;

[0013] Step 6: Extruding the fiber spinning solution from the spinning piece through a metering pump to obtain primary jelly filaments;

[0014] Step 7: The raw gel filaments are air-cooled and shaped, and then stretched by hot rollers without extraction, recovery and other processes. They are stretched into modified ultra-high density polyethylene fiber products with the required fineness in one step.

[0015] The present invention is further configured such that the molecular weight of the ultra-high molecular weight polyethylene powder in step one is in the range of 100,000 to 1,000,000, and the density of the ultra-high molecular weight polyethylene powder after modification is in the range of 0.3 g / cm3 to 1.0 g / cm3, where the powder density refers to the melt density.

[0016] The present invention is further configured such that the processing temperature of the extruder in step five is 180-320°C.

[0017] The present invention is further configured as follows: in the step 2, the particle size of the toner is controlled below 10um and is easy to disperse; the amount of toner added is 0%-6%, the mineral fiber is glass fiber, carbon fiber, silicon dioxide, silicon carbide, etc., the particle size of the mineral fiber is controlled between 50um-200um, the diameter is controlled at 5-9um, and the amount of mineral fiber added is 10%-30%; the ultrafine nano-scale powder is alumina, silicon powder and polytetrafluoroethylene powder.

[0018] The present invention is further configured such that the particle size of the ultrafine nano powder is controlled between 5um and 100um, the diameter is less than 10um, and the addition amount of the ultrafine nano fiber powder is 0% to 20%.

[0019] The present invention is further configured such that the aerogel powder is a finished product prepared in an aerogel system, which is one or more of silicon oxide aerogel, cellulose aerogel, resorcinol-formaldehyde / carbon aerogel and graphene aerogel.

[0020] The present invention is further configured such that the aerogel micropowder has a particle size of <100um, a pore size of less than 80nm, a density of <0.2g / cm3, a porosity of ≥95%, and an addition amount of 0%-35%; the above addition amount refers to the mass ratio of the added material / the added additive in the production batching process: 1+powder 1.

[0021] The present invention is further configured such that the spinning temperature in step 7 is 220-280° C. The color of the finished fiber product is determined by the amount of the additive 1 added and the color of the additive.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides a process route for preparing high-cutting-resistant polyethylene yarn by melt spinning, which has the following beneficial effects:

[0024] In the present application, one or more of mineral fibers, ultrafine nano-scale powders, aerogel powders, and color powders are added and modified, and the properties of the additives are utilized to enhance the functionality of the polyethylene fibers prepared by melt spinning. At the same time, groundbreaking innovations are made in the process of melt-spinning polyethylene fibers, which greatly improves the cut resistance of the melt-spinning polyethylene fibers. For the first time, a process technology for industrially producing highly cut-resistant polyethylene fibers by melt spinning is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is an overall flow chart of a process route for preparing high cut-resistant polyethylene yarn by melt spinning. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0029] Embodiment 1:

[0030] See also Figure 1 A process for preparing high-cutting-resistant polyethylene yarn by melt spinning comprises the following steps:

[0031] The ultra-high molecular weight polyethylene powder is modified to obtain powder 1; wherein the molecular weight of the ultra-high molecular weight polyethylene powder is in the range of 100,000-1,000,000 (GB / T 32679-2016), and the density of the ultra-high molecular weight polyethylene powder after modification is in the range of 0.3 g / cm3-1.0 g / cm3, and the powder density refers to the melt density; the modification method is one or more of physical coating, chemical coating, and high-energy surface modification, including but not limited to infrared, plasma irradiation, electron beam radiation, polymer, silane and other coupling agents or surfactants, etc.;

[0032] One or more of mineral fiber, ultrafine nanometer powder, aerogel powder and toner are selected and mechanically processed to obtain a mixture with a suitable particle size, namely the additive 1; wherein the particle size of the toner is controlled to be below 10um and is easy to disperse; the toner addition amount is 0%-6%, the mineral fiber is glass fiber, carbon fiber, silicon dioxide, silicon carbide, etc., the particle size of the mineral fiber is controlled between 50um-200um, and the diameter is controlled between 5-9um as the best, and the mineral fiber addition amount is 10%-30%; the ultrafine nanometer powder is aluminum oxide, silicon powder, polytetrafluoroethylene powder, etc., and the particle size of the ultrafine nanometer powder is controlled within 5u m-100um, diameter <10um, ultrafine nanofiber powder addition amount is 0%-20%; aerogel powder (microsphere) is a finished product prepared in an aerogel system, such as one or more of silica aerogel, cellulose aerogel, resorcinol-formaldehyde / carbon aerogel and graphene aerogel, etc., aerogel powder (microsphere) particle size <100um, pore size less than 80nm, density <0.2g / cm3, porosity ≥95%, and its addition amount is 0%-35%; the above addition amount refers to the mass ratio of the added material / (added additive 1+powder 1) in the production batching process of the added material;

[0033] According to the set dual feed port mode, loss-in-weight scale 1 automatically feeds powder 1, and loss-in-weight scale 2 automatically feeds additive 1;

[0034] The addition ratio of powder 1 to additive 1 is controlled by different feeding speeds using a loss-in-weight scale;

[0035] The powder 1 and the auxiliary agent 1 are automatically fed according to the set process parameters and transported to the twin-screw extruder (180-320°C) for continuous mixing and homogenization to obtain a uniform fiber spinning solution;

[0036] The fiber spinning solution is squeezed out from the spinning piece by a metering pump to obtain primary jelly filaments;

[0037] The raw gel yarn is air-cooled and shaped, and then hot-rolled, without extraction, recycling and other processes, and is stretched into a modified ultra-high polyethylene fiber product with the required fineness in one step. The spinning temperature is 220-280℃. The color of the finished fiber is determined by the amount of additive 1 added and the added color.

[0038] Embodiment 2:

[0039] Based on Example 1: Black 200D polyethylene fiber:

[0040] Additive 1 mineral fiber is a specially selected ultrafine powder, of which the main material is carbon fiber powder, the particle size is controlled at 100-120um, the diameter is controlled at 7-9um, and the addition amount is 20.5%; the rest is color powder, the particle size of the color powder is controlled at <10um, and the addition amount is 3%. Finally, the melt-spun black 200D polyethylene fiber is obtained through the above route, and its cut resistance grade is A4 (GB / T 14344-2022).

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing high-cutting-resistant polyethylene yarn by melt spinning, characterized in that: The following steps are involved: Step 1: modifying the ultra-high molecular weight polyethylene powder to obtain powder 1; the modification method is one or more of physical coating, chemical coating, and high-energy surface modification, including but not limited to infrared, plasma irradiation, electron beam radiation, polymers, and various silane coupling agents or surfactants; Step 2: Select one or more of mineral fiber, ultrafine nano-powder, aerogel powder, and color powder, and perform mechanical processing on them to obtain a mixture with a suitable particle size, which is the additive 1; Step 3: According to the set dual feed port mode, loss-in-weight scale 1 automatically feeds powder 1, and loss-in-weight scale 2 automatically feeds additive 1; Step 4: The addition ratio of powder 1 and additive 1 is controlled by different feeding speeds using a loss-in-weight scale; Step 5: The powder 1 and the auxiliary agent 1 are automatically fed according to the set process parameters, and transported to the twin-screw extruder for further mixing and homogenization to obtain a uniform fiber spinning solution; Step 6: Extruding the fiber spinning solution from the spinning piece through a metering pump to obtain primary jelly filaments; Step 7: The raw gel filaments are air-cooled and shaped, and then stretched by hot rollers without extraction, recovery and other processes, and are stretched into modified ultra-high polyethylene fiber products with the required fineness in one step.

2. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 1 is characterized by: In the step 1, the molecular weight of the ultra-high molecular weight polyethylene powder is in the range of 100,000-1,000,000, and the density of the ultra-high molecular weight polyethylene powder after modification is in the range of 0.3 g / cm3-1.0 g / cm3, where the powder density refers to the melt density.

3. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 2 is characterized by: The processing temperature of the extruder in step 5 is 180-320°C.

4. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 3 is characterized by: In the step 2, the particle size of the toner is controlled below 10um and is easy to disperse; the amount of toner added is 0%-6%, the mineral fiber is glass fiber, carbon fiber, silicon dioxide, silicon carbide, etc., the particle size of the mineral fiber is controlled between 50um-200um, the diameter is controlled between 5-9um, and the amount of mineral fiber added is 10%-30%; the ultrafine nano-scale powder is alumina, silicon powder and polytetrafluoroethylene powder.

5. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 4 is characterized by: The particle size of the ultrafine nano powder is controlled between 5um and 100um, the diameter is less than 10um, and the addition amount of the ultrafine nano fiber powder is 0%-20%.

6. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 5 is characterized by: The aerogel powder is a finished product prepared in an aerogel system, which is one or more of silicon oxide aerogel, cellulose aerogel, resorcinol-formaldehyde / carbon aerogel and graphene aerogel.

7. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 6 is characterized by: The aerogel micropowder has a particle size of <100um, a pore size of less than 80nm, a density of <0.2g / cm3, a porosity of ≥95%, and an addition amount of 0%-35%; the above addition amount refers to the mass ratio of the added material / the added additive during the production batching process: 1+powder 1.

8. The process of preparing high cut-resistant polyethylene yarn by melt spinning according to claim 7 is characterized by: The spinning temperature in step 7 is 220-280° C. The color of the finished fiber depends on the amount and color of the additive 1.

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