A method for preparing uniformly dyed ultra-high molecular weight polyethylene fiber
Through specific preparation steps, including premix, spinning stock solution, stretching and heat setting treatment, as well as impregnation and color fixation treatment during the preparation and dyeing process of dyeing liquid, the problem of difficult to achieve uniform dyeing during the dyeing process is solved, and efficient and environmentally friendly dyeing effect is achieved.
Patent Information
- Application Number
- CN202411895713.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-04-04
AI Technical Summary
Ultra-high molecular weight polyethylene fibers are difficult to achieve uniform dyeing during the dyeing process, resulting in poor color fastness. The existing dyeing process increases costs, reduces fiber performance or brings environmental pollution.
UHM powder, dispersant, dyeing aid and solvent are used to prepare uniformly dyed ultra-high molecular weight polyethylene fibers through specific stirring, filtration, spinning, stretching and heat setting treatment steps. Specific steps include the preparation of premixes, the preparation of spinning stock solution, the stretching and heat setting treatment of primary fibers, the preparation of dyeing liquids, and the impregnation and color fixation treatment during the dyeing process.
The uniform dyeing of ultra-high molecular weight polyethylene fibers is achieved, which improves the depth and fastness of dyeing, reduces the cost, reduces the impact on fiber performance, and meets environmental protection requirements.
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Figure CN119754058A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of textile material dyeing, in particular to a method for preparing uniformly dyed ultra-high molecular weight polyethylene fibers. Background Art
[0002] Ultra-high molecular weight polyethylene fiber has been widely used in many fields due to its excellent performance. However, in practical applications, it has always been a challenging problem to dye it evenly. Traditional dyeing methods often make it difficult to achieve the ideal dyeing effect for ultra-high molecular weight polyethylene fiber. On the one hand, due to the chemical structure characteristics of ultra-high molecular weight polyethylene fiber, ordinary dyes are difficult to disperse and penetrate evenly inside it, resulting in uneven dyeing, poor color fastness and other problems. On the other hand, the existing dyeing process, while improving dyeing uniformity, often increases costs, reduces fiber performance or brings environmental pollution and other problems. In order to meet the market demand for ultra-high molecular weight polyethylene fiber with good dyeing effect, it is particularly important to develop a new preparation method for ultra-high molecular weight polyethylene fiber with uniform dyeing. This method should not only be able to achieve uniform dyeing, improve the depth and fastness of dyeing, but also reduce costs as much as possible, reduce the impact on fiber performance, and meet environmental protection requirements.
[0003] For example, some existing dyeing processes use dyes with poor dyeing properties and cannot evenly disperse the dye solution in the fiber. In addition, the penetrants used in some processes are not ideal and cannot quickly and effectively wet the fiber surface, affecting the penetration of the dye. In the color fixing stage, some methods cannot effectively enhance the binding force between the dye and the fiber, resulting in the fiber fading or falling off during use. For this reason, we propose a method for preparing evenly dyed ultra-high molecular weight polyethylene fibers. Summary of the invention
[0004] The object of the present invention is to provide a method for preparing uniformly dyed ultra-high molecular weight polyethylene fibers.
[0005] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: a method for preparing uniformly dyed ultra-high molecular weight polyethylene fibers, wherein the main materials for preparing the ultra-high molecular weight polyethylene fibers include ultra-high molecular weight polyethylene powder, a dispersant, a dyeing auxiliary agent and a solvent, and the specific operating steps of the method for preparing the uniformly dyed ultra-high molecular weight polyethylene fibers are as follows:
[0006] Step 1, uniformly stirring an ultra-high molecular weight polyethylene powder and a dispersant accounting for 5% of the mass of the ultra-high molecular weight polyethylene powder at 80° C. for 3 hours to obtain a premix, then adding the premix to a mixed solution of a dyeing auxiliary and a solvent, stirring and mixing at 120° C. for 5 hours to obtain a spinning solution, filtering the spinning solution with a filter, and degassing for 2 hours, and then spinning through a spinneret with a pore size of 0.2 mm to obtain a primary fiber, and performing primary and secondary stretching on the primary fiber. After the stretching is completed, heat setting treatment is performed at 150° C. for 1 hour to obtain an ultra-high molecular weight polyethylene fiber;
[0007] Step 2: prepare a dye, add 150-200 parts of disperse dye, 3-7 parts of penetrant, 2-4 parts of leveling agent, 2-4 parts of initiator and 5-10 parts of dye auxiliary agent into a stirring tank in sequence, stir, and slowly add 35°C clean water to stir and mix, stir for 25-35 minutes until the solution is evenly mixed, to obtain a mixed dye solution;
[0008] Step 3, pre-treating the ultra-high molecular weight polyethylene fiber, including cleaning the ultra-high molecular weight polyethylene fiber for pre-treatment, and placing it in a plasma environment for treatment for 5 minutes to 15 minutes;
[0009] Step 4: Place the mixed dye solution in a dyeing tank, and then immerse the pretreated ultra-high molecular weight polyethylene fiber in the mixed dye solution, and dye it at 90°C for 40min-80min. During the dyeing process, the mixed dye solution is continuously stirred to make the dye evenly dispersed and fully contact the fiber. After the dyeing is completed, the dye solution is discharged and quickly injected into chilled water for treatment for 10min-15min.
[0010] Step 5: Perform a color fixing treatment on the cooled ultra-high molecular weight polyethylene fiber, put it into a heat setting device, treat it at a temperature of 145° C.-150° C. for 5s-60s, and take it out to obtain the finished ultra-high molecular weight polyethylene fiber.
[0011] As a further solution of the present invention: in the step 1, the dispersant is polyethylene glycol, the dyeing auxiliary is sodium fatty alcohol polyoxyethylene ether sulfate, and the solvent is xylene.
[0012] As a further solution of the present invention: in the step one, the spun fiber is subjected to primary stretching at 130°C and a tension of 10N, with a stretching multiple of 5 times, and then it is subjected to secondary stretching at 140°C and a tension of 15N, with a stretching multiple of 8 times, so that its molecular chains are highly oriented, and the diameter of the spun fiber is 0.5 mm.
[0013] As a further solution of the present invention: in the step 2, the disperse dye is disperse blue 2BLN, the penetrant is JFC penetrant, the leveling agent is fatty alcohol polyoxyethylene ether, the initiator is ammonium persulfate, and the dye auxiliary agent is glauber salt.
[0014] As a further solution of the present invention: in step 2, after the preparation is completed, the pH value, concentration and stability of the mixed dye solution are tested to ensure that the mixed dye solution meets the requirements of subsequent dyeing.
[0015] As a further solution of the present invention: in the step three, the pretreatment of the ultra-high molecular weight polyethylene fiber includes surface cleaning and plasma treatment, and the plasma gas used in the plasma treatment is NH3.
[0016] As a further solution of the present invention: in the step 4, the temperature of the chilled water is -5°C-20°C, and after the ultra-high molecular weight polyethylene fiber is treated with the chilled water, it needs to be spread on a wooden stick and left to stand for 15 minutes.
[0017] As a further solution of the present invention: In the step five, when performing the heat setting operation, it is necessary to apply tension to the ultra-high molecular weight polyethylene fiber, and stretch the ultra-high molecular weight polyethylene fiber at a stretching rate of 0.8m / s-1.2m / s, and maintain this state for 10s-20s, and stretch the ultra-high molecular weight polyethylene fiber while it is heated.
[0018] As a further solution of the present invention: in the step 5, after the stretching operation is completed, the ultra-high molecular weight polyethylene fiber is naturally cooled to room temperature in a heat setting device to obtain an ultra-high molecular weight polyethylene fiber finished product.
[0019] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:
[0020] 1. The present invention uses disperse blue 2BLN as a disperse dye, so that the mixed dye solution can be evenly dispersed in the ultra-high molecular weight polyethylene fiber, and has good dyeing performance on the ultra-high molecular weight polyethylene fiber. By using a JFC penetrant, the surface tension of the solution can be reduced, and the surface of the ultra-high molecular weight polyethylene fiber can be quickly wetted, which helps the mixed dye to better penetrate into the interior of the ultra-high molecular weight polyethylene fiber, improves the uniformity and depth of dyeing, and by adding sodium sulfate to the mixed dye, the ionic strength of the dye solution can be effectively adjusted, and the dyeing rate of the mixed dye is increased, while reducing the dyeing cost of the ultra-high molecular weight polyethylene fiber;
[0021] 2. The present invention uses heat setting to fix the dyed ultra-high molecular weight polyethylene fiber, which can enhance the bonding force between the mixed dye and the ultra-high molecular weight polyethylene fiber, reduce the problem of dye fading or falling off during subsequent use of the ultra-high molecular weight polyethylene fiber, and help eliminate the residual stress inside the fiber, improve the dimensional stability and mechanical properties of the fiber, make it more durable, and at the same time increase the softness of the ultra-high molecular weight polyethylene fiber, thereby improving the quality of the overall product. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of the polyethylene fiber dyeing process in an embodiment of the present invention;
[0023] Figure 2 Schematic diagram of the characteristics of polyethylene fiber after dyeing in an embodiment of the present invention. DETAILED DESCRIPTION
[0024] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0025] The present invention discloses a method for preparing uniformly dyed ultra-high molecular weight polyethylene fibers. The main materials for preparing the ultra-high molecular weight polyethylene fibers include ultra-high molecular weight polyethylene powder, a dispersant, a dyeing auxiliary agent, and a solvent. The specific operation steps of the method for preparing the uniformly dyed ultra-high molecular weight polyethylene fibers are as follows:
[0026] Step 1, uniformly stirring an ultra-high molecular weight polyethylene powder and a dispersant accounting for 5% of the mass of the ultra-high molecular weight polyethylene powder at 80° C. for 3 hours to obtain a premix, then adding the premix to a mixed solution of a dyeing auxiliary and a solvent, stirring and mixing at 120° C. for 5 hours to obtain a spinning solution, filtering the spinning solution with a filter, and degassing for 2 hours, and then spinning through a spinneret with a pore size of 0.2 mm to obtain a primary fiber, and performing primary and secondary stretching on the primary fiber. After the stretching is completed, heat setting treatment is performed at 150° C. for 1 hour to obtain an ultra-high molecular weight polyethylene fiber;
[0027] Step 2: prepare a dye, add 150-200 parts of disperse dye, 3-7 parts of penetrant, 2-4 parts of leveling agent, 2-4 parts of initiator and 5-10 parts of dye auxiliary agent into a stirring tank in sequence, stir, and slowly add 35°C clean water to stir and mix, stir for 25-35 minutes until the solution is evenly mixed, to obtain a mixed dye solution;
[0028] Step 3, pre-treating the ultra-high molecular weight polyethylene fiber, including cleaning the ultra-high molecular weight polyethylene fiber for pre-treatment, and placing it in a plasma environment for treatment for 5 minutes to 15 minutes;
[0029] Step 4: Place the mixed dye solution in a dyeing tank, and then immerse the pretreated ultra-high molecular weight polyethylene fiber in the mixed dye solution, and dye it at 90°C for 40min-80min. During the dyeing process, the mixed dye solution is continuously stirred to make the dye evenly dispersed and fully contact the fiber. After the dyeing is completed, the dye solution is discharged and quickly injected into chilled water for treatment for 10min-15min.
[0030] Step 5: Perform a color fixing treatment on the cooled ultra-high molecular weight polyethylene fiber, put it into a heat setting device, treat it at a temperature of 145° C.-150° C. for 5s-60s, and take it out to obtain the finished ultra-high molecular weight polyethylene fiber.
[0031] In one embodiment of the present invention: in step 1, the dispersant is polyethylene glycol, the dyeing auxiliary is sodium fatty alcohol polyoxyethylene ether sulfate, and the solvent is xylene.
[0032] In one embodiment of the present invention: in step one, the spun fiber is subjected to primary stretching at 130°C and a tension of 10N, with a stretching multiple of 5 times, and then it is subjected to secondary stretching at 140°C and a tension of 15N, with a stretching multiple of 8 times, so that its molecular chain is highly oriented, and the diameter of the spun fiber is 0.5 mm.
[0033] In one embodiment of the present invention: in step 2, the disperse dye is disperse blue 2BLN, the penetrant is JFC penetrant, the leveling agent is fatty alcohol polyoxyethylene ether, the initiator is ammonium persulfate, and the dye auxiliary agent is glauber salt.
[0034] In one embodiment of the present invention: in step 2, after the preparation is completed, the pH value, concentration and stability of the mixed dye solution are tested to ensure that the mixed dye solution meets the requirements of subsequent dyeing.
[0035] In one embodiment of the present invention: in step three, the pretreatment of the ultra-high molecular weight polyethylene fiber includes surface cleaning and plasma treatment, and the plasma gas used in the plasma treatment is NH3.
[0036] In one embodiment of the present invention: in step 4, the temperature of the freezing water is -5°C-20°C, and after the ultra-high molecular weight polyethylene fiber is treated with freezing water, it needs to be spread on a wooden stick and left to stand for 15 minutes.
[0037] In one embodiment of the present invention: in step five, when performing the heat setting operation, it is necessary to apply tension to the ultra-high molecular weight polyethylene fiber, and stretch the ultra-high molecular weight polyethylene fiber at a stretching rate of 0.8m / s-1.2m / s, and maintain this state for 10s-20s, and stretch the ultra-high molecular weight polyethylene fiber while it is heated.
[0038] In one embodiment of the present invention: in step five, after the stretching operation is completed, the ultra-high molecular weight polyethylene fiber is naturally cooled to room temperature in a heat setting device to obtain an ultra-high molecular weight polyethylene fiber product.
[0039] Embodiment 1
[0040] First, ultra-high molecular weight polyethylene powder and polyethylene glycol accounting for 5% of the mass of the ultra-high molecular weight polyethylene powder are uniformly stirred at 80° C. for 3 hours to obtain a premix, and then the premix is added to a mixed solution of sodium fatty alcohol polyoxyethylene ether sulfate and xylene, and stirred and mixed at 120° C. for 5 hours to obtain a spinning solution, and the spinning solution is filtered using a filter and degassed for 2 hours, and then spun through a spinneret with a pore size of 0.2 mm to obtain a spun fiber, and the spun fiber is subjected to primary and secondary stretching, and the spun fiber is subjected to primary stretching at 130° C. and a tension of 10 N, with a stretching multiple of 5 times, and then it is subjected to secondary stretching at 140° C. and a tension of 15 N, with a stretching multiple of 8 times, so that its molecular chain is highly oriented, and the diameter of the spun fiber is 0.5 mm. After the stretching is completed, it is heat-set at 150° C. for 1 hour to obtain an ultra-high molecular weight polyethylene fiber;
[0041] Afterwards, 150 parts of disperse blue 2BLN, 3 parts of JFC penetrant, 2 parts of fatty alcohol polyoxyethylene ether, 2 parts of ammonium persulfate and 10 parts of sodium sulfate were added to a stirring tank in sequence for stirring, and clean water at 35°C was slowly added for stirring and mixing. After stirring for 25 minutes, until the solution was evenly mixed, a mixed dye solution was obtained. After the preparation was completed, the pH value, concentration and stability of the mixed dye solution were tested to ensure that the mixed dye solution met the requirements of subsequent dyeing. The ultra-high molecular weight polyethylene fiber was pretreated, including cleaning the ultra-high molecular weight polyethylene fiber for pretreatment, and placing it in a plasma environment for treatment with plasma gas NH3 for 15 minutes, placing the mixed dye solution in a dyeing tank, and then immersing the pretreated ultra-high molecular weight polyethylene fiber in the mixed dye solution, and dyeing it at 90°C for 60 minutes. During the dyeing process, the mixed dye solution was continuously stirred to make the dye The material is evenly dispersed and fully in contact with the fiber. After dyeing, the dye solution is discharged and quickly injected into -5°C frozen water for 15 minutes. After the ultra-high molecular weight polyethylene fiber is treated with frozen water, it needs to be spread on a wooden stick and let stand for 15 minutes. Finally, the cooled ultra-high molecular weight polyethylene fiber is subjected to color fixation treatment, placed in a heat setting device, and tension is applied to the ultra-high molecular weight polyethylene fiber. The ultra-high molecular weight polyethylene fiber is then stretched at a stretching rate of 0.8m / s-1.2m / s, and this state is maintained for 20s. While the ultra-high molecular weight polyethylene fiber is heated, it is stretched at a temperature of 145°C-150°C for 60s. After the stretching operation is completed, the ultra-high molecular weight polyethylene fiber is naturally cooled to room temperature in the heat setting device, and the ultra-high molecular weight polyethylene fiber is taken out to obtain a finished ultra-high molecular weight polyethylene fiber.
[0042] Embodiment 2
[0043] First, ultra-high molecular weight polyethylene powder and polyethylene glycol accounting for 5% of the mass of the ultra-high molecular weight polyethylene powder are uniformly stirred at 80° C. for 3 hours to obtain a premix, and then the premix is added to a mixed solution of sodium fatty alcohol polyoxyethylene ether sulfate and xylene, and stirred and mixed at 120° C. for 5 hours to obtain a spinning solution, and the spinning solution is filtered using a filter and degassed for 2 hours, and then spun through a spinneret with a pore size of 0.2 mm to obtain a spun fiber, and the spun fiber is subjected to primary and secondary stretching, and the spun fiber is subjected to primary stretching at 130° C. and a tension of 10 N, with a stretching multiple of 5 times, and then it is subjected to secondary stretching at 140° C. and a tension of 15 N, with a stretching multiple of 8 times, so that its molecular chain is highly oriented, and the diameter of the spun fiber is 0.5 mm. After the stretching is completed, it is heat-set at 150° C. for 1 hour to obtain an ultra-high molecular weight polyethylene fiber;
[0044] Afterwards, 150 parts of disperse blue 2BLN, 7 parts of JFC penetrant, 4 parts of fatty alcohol polyoxyethylene ether, 4 parts of ammonium persulfate and 10 parts of sodium sulfate were added to a stirring tank in sequence for stirring, and clean water at 35°C was slowly added for stirring and mixing. After stirring for 25 minutes, until the solution was evenly mixed, a mixed dye solution was obtained. After the preparation was completed, the pH value, concentration and stability of the mixed dye solution were tested to ensure that the mixed dye solution met the requirements of subsequent dyeing. The ultra-high molecular weight polyethylene fiber was pretreated, including cleaning the ultra-high molecular weight polyethylene fiber for pretreatment, and placing it in a plasma environment for treatment with plasma gas NH3 for 15 minutes, placing the mixed dye solution in a dyeing tank, and then immersing the pretreated ultra-high molecular weight polyethylene fiber in the mixed dye solution, and dyeing it at 90°C for 60 minutes. During the dyeing process, the mixed dye solution was continuously stirred to make the dye The material is evenly dispersed and fully in contact with the fiber. After dyeing, the dye solution is discharged and quickly injected into -5°C frozen water for 15 minutes. After the ultra-high molecular weight polyethylene fiber is treated with frozen water, it needs to be spread on a wooden stick and let stand for 15 minutes. Finally, the cooled ultra-high molecular weight polyethylene fiber is subjected to color fixation treatment, placed in a heat setting device, and tension is applied to the ultra-high molecular weight polyethylene fiber. The ultra-high molecular weight polyethylene fiber is then stretched at a stretching rate of 0.8m / s-1.2m / s, and this state is maintained for 20s. While the ultra-high molecular weight polyethylene fiber is heated, it is stretched at a temperature of 145°C-150°C for 60s. After the stretching operation is completed, the ultra-high molecular weight polyethylene fiber is naturally cooled to room temperature in the heat setting device, and the ultra-high molecular weight polyethylene fiber is taken out to obtain a finished ultra-high molecular weight polyethylene fiber.
[0045] Embodiment 3
[0046] First, ultra-high molecular weight polyethylene powder and polyethylene glycol accounting for 5% of the mass of the ultra-high molecular weight polyethylene powder are uniformly stirred at 80° C. for 3 hours to obtain a premix, and then the premix is added to a mixed solution of sodium fatty alcohol polyoxyethylene ether sulfate and xylene, and stirred and mixed at 120° C. for 5 hours to obtain a spinning solution, and the spinning solution is filtered using a filter and degassed for 2 hours, and then spun through a spinneret with a pore size of 0.2 mm to obtain a spun fiber, and the spun fiber is subjected to primary and secondary stretching, and the spun fiber is subjected to primary stretching at 130° C. and a tension of 10 N, with a stretching multiple of 5 times, and then it is subjected to secondary stretching at 140° C. and a tension of 15 N, with a stretching multiple of 8 times, so that its molecular chain is highly oriented, and the diameter of the spun fiber is 0.5 mm. After the stretching is completed, it is heat-set at 150° C. for 1 hour to obtain an ultra-high molecular weight polyethylene fiber;
[0047] Afterwards, 200 parts of disperse blue 2BLN, 3 parts of JFC penetrant, 4 parts of fatty alcohol polyoxyethylene ether, 4 parts of ammonium persulfate and 5 parts of sodium sulfate were added to a stirring tank in sequence for stirring, and clean water at 35°C was slowly added for stirring and mixing. After stirring for 25 minutes, until the solution was evenly mixed, a mixed dye solution was obtained. After the preparation was completed, the pH value, concentration and stability of the mixed dye solution were tested to ensure that the mixed dye solution met the requirements of subsequent dyeing. The ultra-high molecular weight polyethylene fiber was pretreated, including cleaning the ultra-high molecular weight polyethylene fiber for pretreatment, and placing it in a plasma environment for treatment with plasma gas NH3 for 15 minutes, placing the mixed dye solution in a dyeing tank, and then immersing the pretreated ultra-high molecular weight polyethylene fiber in the mixed dye solution, and dyeing it at 90°C for 60 minutes. During the dyeing process, the mixed dye solution was continuously stirred to make the dye The material is evenly dispersed and fully in contact with the fiber. After dyeing, the dye solution is discharged and quickly injected into -5°C frozen water for 15 minutes. After the ultra-high molecular weight polyethylene fiber is treated with frozen water, it needs to be spread on a wooden stick and let stand for 15 minutes. Finally, the cooled ultra-high molecular weight polyethylene fiber is subjected to color fixation treatment, placed in a heat setting device, and tension is applied to the ultra-high molecular weight polyethylene fiber. The ultra-high molecular weight polyethylene fiber is then stretched at a stretching rate of 0.8m / s-1.2m / s, and this state is maintained for 20s. While the ultra-high molecular weight polyethylene fiber is heated, it is stretched at a temperature of 145°C-150°C for 60s. After the stretching operation is completed, the ultra-high molecular weight polyethylene fiber is naturally cooled to room temperature in the heat setting device, and the ultra-high molecular weight polyethylene fiber is taken out to obtain a finished ultra-high molecular weight polyethylene fiber.
[0048] The color fastness of the three groups of examples was tested, including tests on rubbing fastness, washing fastness, etc. The fiber strength test needs to use corresponding mechanical testing equipment and be carried out according to standard testing methods.
[0049] Use a friction fastness tester to fix the dyed polyethylene fiber sample on the tester, and perform dry friction and wet friction tests respectively. Dry friction is to rub the sample back and forth a certain number of times with a dry standard friction cloth, and wet friction is to soak the friction cloth with distilled water and then perform the same operation. It is expressed in grades, with levels from 1 to 5. The higher the grade, the better the friction fastness.
[0050] The dyed polyethylene fiber sample is washed according to the specified conditions, and the color change is evaluated by comparing it with the unwashed standard sample, and recorded according to grades 1-5. The higher the grade, the better the uniformity.
[0051] Use mechanical testing equipment such as a universal material testing machine to fix the polyethylene fiber sample on the testing machine in a standard clamping method, stretch it at a certain stretching speed until the sample breaks, and record the maximum force value at the time of break, in megapascals (MPa), which represents the tensile strength of the fiber.
[0052] As attached Figure 2 As shown, the dyeing uniformity of ultra-high molecular weight polyethylene fiber is not affected by the amount of dye within a suitable range.
[0053] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.
[0054] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0055] The above contents are merely examples and explanations of the present invention. Various modifications or additions to the specific embodiments described or replacements in similar ways by technicians in the technical field shall fall within the protection scope of the present invention as long as they do not deviate from the invention or exceed the scope defined by the claims.
[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A method for preparing uniformly dyed ultra-high molecular weight polyethylene fibers, characterized in that: The main materials for preparing the ultra-high molecular weight polyethylene fiber include ultra-high molecular weight polyethylene powder, dispersant, dyeing auxiliary agent and solvent. The specific operation steps of the method for preparing the uniformly dyed ultra-high molecular weight polyethylene fiber are as follows: Step 1, uniformly stirring an ultra-high molecular weight polyethylene powder and a dispersant accounting for 5% of the mass of the ultra-high molecular weight polyethylene powder at 80° C. for 3 hours to obtain a premix, then adding the premix to a mixed solution of a dyeing auxiliary and a solvent, stirring and mixing at 120° C. for 5 hours to obtain a spinning solution, filtering the spinning solution with a filter, and degassing for 2 hours, and then spinning through a spinneret with a pore size of 0.2 mm to obtain a primary fiber, and performing primary and secondary stretching on the primary fiber. After the stretching is completed, heat setting treatment is performed at 150° C. for 1 hour to obtain an ultra-high molecular weight polyethylene fiber; Step 2: prepare a dye, add 150-200 parts of disperse dye, 3-7 parts of penetrant, 2-4 parts of leveling agent, 2-4 parts of initiator and 5-10 parts of dye auxiliary agent into a stirring tank in sequence, stir, and slowly add 35°C clean water to stir and mix, stir for 25-35 minutes until the solution is evenly mixed, to obtain a mixed dye solution; Step 3, pre-treating the ultra-high molecular weight polyethylene fiber, including cleaning the ultra-high molecular weight polyethylene fiber for pre-treatment, and placing it in a plasma environment for treatment for 5 minutes to 15 minutes; Step 4: Place the mixed dye solution in a dyeing tank, and then immerse the pretreated ultra-high molecular weight polyethylene fiber in the mixed dye solution, and dye it at 90°C for 40min-80min. During the dyeing process, the mixed dye solution is continuously stirred to make the dye evenly dispersed and fully contact the fiber. After the dyeing is completed, the dye solution is discharged and quickly injected into chilled water for treatment for 10min-15min. Step 5: Perform a color fixing treatment on the cooled ultra-high molecular weight polyethylene fiber, put it into a heat setting device, treat it at a temperature of 145° C.-150° C. for 5s-60s, and take it out to obtain the finished ultra-high molecular weight polyethylene fiber.
2. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 1, the dispersant is polyethylene glycol, the dyeing auxiliary is sodium fatty alcohol polyoxyethylene ether sulfate, and the solvent is xylene.
3. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 1, the spun fiber is subjected to primary stretching at 130° C. and a tension of 10 N, with a stretching multiple of 5 times, and then subjected to secondary stretching at 140° C. and a tension of 15 N, with a stretching multiple of 8 times, so that its molecular chain is highly oriented. The diameter of the spun fiber is 0.5 mm.
4. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 2, the disperse dye is disperse blue 2BLN, the penetrant is JFC penetrant, the leveling agent is fatty alcohol polyoxyethylene ether, the initiator is ammonium persulfate, and the dye auxiliary agent is glauber salt.
5. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 2, after the preparation is completed, the pH value, concentration and stability of the mixed dye solution are tested to ensure that the mixed dye solution meets the requirements of subsequent dyeing.
6. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step three, the ultra-high molecular weight polyethylene fiber is pretreated including surface cleaning and plasma treatment, and the plasma gas used in the plasma treatment is NH3.
7. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 4, the temperature of the chilled water is -5°C-20°C. After the ultra-high molecular weight polyethylene fiber is treated with the chilled water, it needs to be spread on a wooden stick and left to stand for 15 minutes.
8. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 5, when performing the heat setting operation, it is necessary to apply tension to the ultra-high molecular weight polyethylene fiber, and stretch the ultra-high molecular weight polyethylene fiber at a stretching rate of 0.8m / s-1.2m / s, and maintain this state for 10s-20s, and stretch the ultra-high molecular weight polyethylene fiber while it is heated.
9. The method for preparing a uniformly dyed ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that: In the step 5, after the stretching operation is completed, the ultra-high molecular weight polyethylene fiber is naturally cooled to room temperature in a heat setting device to obtain an ultra-high molecular weight polyethylene fiber product.