Broken yarn removing agent and broken fiber yarn removing method

Abstract

The invention relates to the technical field of broken fiber clearing, in particular to a broken fiber clearing agent and a broken fiber clearing method. Through fiber infiltration, drying curing and water washing, broken filaments in the fibers can be effectively removed, and adverse effects of the broken filaments on subsequent application of the fibers are avoided. Specifically, polyvinyl alcohol and chitosan are infiltrated on the surface of the fiber and dried to generate a cross-linking reaction, so that numerous and loose fiber monofilaments in the fiber are bundled under the action of bundling external force, the bundling external force mainly and vertically acts on the surface of the fiber to form shearing force on the fiber, and under normal conditions, the fiber is bundled by the bundling external force. And the mechanical properties of broken filaments and hairiness on the surface of the product are relatively weak, so that the broken filaments and hairiness are further damaged and broken more easily under the action of'bundling 'shearing external force, and are screened and cleaned out.

Description

Technical Field

[0001] The invention relates to the technical field of fiber broken wire cleaning, and in particular to a broken wire cleaning agent and a fiber broken wire cleaning method. Background Art

[0002] Fibers can be divided into organic fibers and inorganic fibers according to their component types. In comparison, the latter are more prone to broken fibers, hairiness, etc. These defects in the fibers have a significant impact on the subsequent applications of the fibers.

[0003] For example, carbon fiber bundles contain numerous single filaments, and during the metallization process, they need to go through a series of treatment processes such as surface degumming and metallization, which will inevitably cause broken wires and hairiness, and have a serious impact on the application end. More conductive broken wires are more likely to scatter in the factory area during subsequent application and processing, causing dust pollution, affecting personnel health and causing short circuits and electrical equipment failures; when used in composite materials, broken wires increase the defects in the composite structure and affect the overall system performance; when used as a grounding conductive device for bearing electrical corrosion protection, broken wires are easy to scatter into the drive motor, causing motor failure. Problems such as these also exist in inorganic fibers such as quartz fiber, silicon carbide fiber, and basalt fiber. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a broken wire remover and a method for cleaning broken fibers. The present invention can effectively remove broken fibers in fibers and avoid the adverse effects of broken fibers on subsequent applications of the fibers.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The invention provides a broken wire remover, which comprises, by weight percentage, 0.5-8% of polyvinyl alcohol, 0.25-1.25% of chitosan and the balance of water.

[0007] Preferably, in terms of mass percentage, the mixture further comprises 3-8% of a methanol solution of benzotriazole; the mass concentration of benzotriazole in the methanol solution of benzotriazole is 0.1-0.2%.

[0008] The present invention provides a method for cleaning broken fibers, comprising the following steps: soaking fibers containing broken fibers with the broken fiber remover according to claim 1 or 2;

[0009] The impregnated fibers are dried and solidified, and the broken fibers in the fibers are further broken into smaller broken fibers to obtain solidified fibers;

[0010] The solidified fiber is washed with water to dissolve the broken fiber remover and wash away the broken fibers.

[0011] Preferably, the drying and curing temperature is 50-100° C. and the time is 5-10 min.

[0012] Preferably, the water temperature of the water washing is 60-80°C.

[0013] Preferably, the water washing is running water overflow washing.

[0014] Preferably, the fiber containing broken filaments is a rigid inorganic fiber.

[0015] Preferably, the rigid inorganic fiber includes one or more of carbon fiber, basalt fiber, silicon carbide fiber, alumina fiber and quartz fiber.

[0016] Preferably, the soaking temperature is 25-40°C.

[0017] Preferably, the fibers are impregnated, dried, solidified and washed under widening conditions.

[0018] The invention provides a broken wire remover, which comprises, by weight percentage, 0.5-8% of polyvinyl alcohol, 0.25-1.25% of chitosan and the balance of water.

[0019] In the present invention, after the polyvinyl alcohol and chitosan are impregnated on the fiber surface and dried, a cross-linking reaction occurs, which causes the numerous and loose fiber filaments in the fiber to be bundled under the action of a "bundling" external force. The "bundling" external force mainly acts vertically on the surface of the fiber to form a shear force on the fiber. Under normal circumstances, the mechanical properties of broken fibers and hairiness on the surface of the product are relatively weak, so they are more likely to be further damaged and broken under the "bundling" shear force, and thus be screened and cleaned out.

[0020] Furthermore, the broken wire removing agent of the present invention also includes a methanol solution of benzotriazole. The benzotriazole serves as a stabilizer for the broken wire removing agent and can prevent the growth of microorganisms when the agent is working or stored for a long time. In addition, when there are metal materials such as copper, nickel, and zinc on the surface of the treated fiber, it can have a certain anti-corrosion effect.

[0021] The present invention provides a method for cleaning broken fibers. The broken fibers in the fibers can be effectively removed through fiber infiltration, drying, solidification and water washing, thereby preventing the broken fibers from having an adverse effect on subsequent applications of the fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the device used in the method for cleaning broken fibers in the embodiment, wherein: 1-fibers containing broken fibers, 2-reagent tank, 3-arc guide rollers, 4-first drying oven, 5-washing tank, 6-second drying oven, 7-winding device. DETAILED DESCRIPTION

[0023] The invention provides a broken wire remover, which comprises, by weight percentage, 0.5-8% of polyvinyl alcohol, 0.25-1.25% of chitosan and the balance of water.

[0024] In terms of mass percentage, the broken wire remover provided by the present invention includes 0.5-8% polyvinyl alcohol. In a specific embodiment, the content of polyvinyl alcohol in the broken wire remover can be 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8%. In the present invention, the polyvinyl alcohol is impregnated on the fiber surface and dried to undergo a cross-linking reaction with chitosan, so that the loose fibers are bundled and the broken wires are caused to break under the action of shear force.

[0025] In terms of mass percentage, the broken wire remover provided by the present invention includes 0.25-1.25% chitosan. In a specific embodiment, the content of chitosan in the broken wire remover can be 0.25%, 0.5%, 0.75%, 1% or 1.25%. In the present invention, the chitosan is impregnated on the fiber surface and dried to undergo a cross-linking reaction with polyvinyl alcohol, so that the loose fibers are bundled and the broken wires are caused to break under the action of shear force.

[0026] In terms of percentage by mass, the broken wire remover provided by the present invention preferably also includes 3-8% of a methanol solution of benzotriazole; in a specific embodiment, the content of the methanol solution of benzotriazole can be 3%, 4%, 5%, 6%, 7% or 8%. In the present invention, the mass concentration of benzotriazole in the methanol solution of benzotriazole is preferably 0.1-0.2%, and in a specific embodiment, it can be 0.1%, 0.15% or 2%. In the present invention, the benzotriazole is used as a stabilizer for the broken wire removal reagent to prevent the growth of microorganisms when the reagent is working or stored for a long time. In addition, when there are metal materials such as copper, nickel, and zinc on the surface of the treated fiber, it can have a certain anti-corrosion effect.

[0027] The broken wire remover provided by the present invention also includes a balance of water. In the present invention, the water is preferably pure water.

[0028] The present invention has no special requirements for the preparation method of the broken wire remover, and the components can be directly dissolved and mixed evenly. In an embodiment of the present invention, it is preferred to first prepare polyvinyl alcohol into a polyvinyl alcohol aqueous solution, prepare chitosan into a chitosan aqueous solution, and then mix the polyvinyl alcohol aqueous solution and the chitosan aqueous solution (if necessary, also including a methanol solution of benzotriazole) with water to obtain the broken wire remover.

[0029] The present invention provides a method for cleaning broken fibers, comprising the following steps: soaking the fibers containing broken fibers with the broken fiber remover described in the above scheme;

[0030] The impregnated fibers are dried and solidified, and the broken fibers in the fibers are further broken into smaller broken fibers to obtain solidified fibers;

[0031] The solidified fiber is washed with water to dissolve the broken fiber remover and wash away the broken fibers.

[0032] In the present invention, unless otherwise specified, the raw materials and equipment used are commercially available products or equipment well known in the art.

[0033] The present invention uses the above-mentioned broken filament remover to impregnate the fiber containing broken filaments.

[0034] In the present invention, the fiber containing broken filaments is a rigid inorganic fiber; the rigid inorganic fiber preferably includes one or more of carbon fiber, basalt fiber, silicon carbide fiber, alumina fiber and quartz fiber. In the present invention, the surface of the above-mentioned fiber may be coated with a metal layer or not, for example, carbon fiber refers to carbon fiber coated with a metal layer or not. The present invention has no special requirements on the specifications of the fiber containing broken filaments, and any specifications are acceptable. In an embodiment of the present invention, the fiber containing broken filaments is specifically 12k metal-coated carbon fiber or 0.5k silicon carbide fiber.

[0035] In the present invention, the soaking temperature is preferably 25-40°C. In a specific embodiment, the soaking temperature can be 25°C, 30°C, 35°C or 40°C. The present invention has no special requirements for the soaking time, as long as the fibers containing broken fibers can be fully soaked. The present invention has no special requirements for the specific operation of soaking, as long as the soaking effect can be achieved. In an embodiment of the present invention, a broken wire remover is placed in a reagent tank, and a plurality of groups of replaceable and adjustable arc guide rollers are configured in the reagent tank to control the width of the fiber bundle. The fibers are located on the arc guide rollers and pass through the reagent tank containing the broken wire remover, thereby being soaked.

[0036] In the present invention, during the impregnation, the fiber bundle preferably has a width of 1 to 30 mm. The present invention ensures a better impregnation effect by widening the fiber.

[0037] After the fiber is impregnated, the present invention dries and solidifies the impregnated fiber, and the broken fibers in the fiber are further broken to form broken fibers with smaller sizes, thereby obtaining solidified fibers.

[0038] In the present invention, the drying and curing temperature is preferably 50-100°C, and the time is preferably 5-10 minutes; in a specific embodiment, the drying and curing temperature can be 50°C, 60°C, 70°C, 80°C, 90°C or 100°C, and the drying and curing time can be 5 minutes, 6 minutes, 8 minutes or 10 minutes. The present invention preferably performs the drying and curing in a drying oven. During the drying and curing, the width of the fiber bundle is the same as the width during the drying and curing.

[0039] In the present invention, the fibers are preferably 1 to 30 mm wide during drying and curing. The present invention ensures uniform and efficient drying and curing of the fiber bundles by widening.

[0040] During the drying and curing process of the present invention, the polyvinyl alcohol and chitosan impregnated on the fiber surface undergo a cross-linking reaction, causing the numerous and loose fiber filaments in the fiber to be bundled under the action of a "bundling" external force. The "bundling" external force mainly acts vertically on the surface of the fiber to form a shear force on the fiber. Under normal circumstances, the mechanical properties of broken fibers and hairiness on the surface of the product are relatively weak, so they are more likely to be further damaged and broken under the "bundling" shear force, and thus be screened and cleaned out by subsequent water washing.

[0041] After the solidified fiber is obtained, the present invention washes the solidified fiber with water to dissolve the broken fiber remover and wash away the broken fibers.

[0042] In the present invention, the water temperature of the water washing is preferably 60-80°C. In a specific embodiment, the water temperature of the water washing can be 60°C, 65°C, 70°C, 75°C or 80°C. In the present invention, the water washing is preferably running water overflow washing. The present invention makes it easier to dissolve the broken wire remover and to clean the broken wires from the fiber bundle through running water overflow washing. The present invention has no special requirements for the replenishment rate of running water. In an embodiment of the present invention, it is specifically 3L / min or 0.5L / min. The present invention has no special requirements for the time of the water washing, as long as the purpose of removing the broken wires can be achieved. In a specific embodiment, the water washing time is 2-5min. During the water washing, the width of the fiber bundle is the same as the width during drying and curing.

[0043] After the washing is completed, the present invention preferably further comprises drying and collecting the obtained fibers.

[0044] In the present invention, the drying temperature is preferably 80 to 130° C., and the drying time is preferably 1 to 6 minutes.

[0045] Figure 1 Schematic diagram of the device used in the method for cleaning broken fibers in the embodiment, as shown in FIG. Figure 1As shown, the fiber 1 containing broken fibers is placed on the curved guide roller 3, firstly soaked in the reagent tank 2 containing the broken fiber remover, then dried and solidified in the first drying oven 4, then sent to the washing tank 5 for washing, and the washed fibers are continuously sent to the second drying oven 6 for drying, and finally collected by the take-up device 7. The whole method is continuous and the production line is simple.

[0046] The broken wire remover and the method for cleaning broken fibers provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0047] Example 1

[0048] (1) Fiber impregnation: The 12k metal-coated carbon fiber to be treated is fed into a reagent tank containing a broken wire remover, wherein the broken wire remover contains, in addition to pure water, 13% of a 25% polyvinyl alcohol aqueous solution, 10% of an 8% chitosan aqueous solution, and 5% of a 0.1% benzotriazole methanol solution. The solution temperature is 30°C and the treatment time is 3 minutes. The axial spacing of the selected filament bundle widening arc guide roller is adjusted to control the filament bundle to have a width of 8mm. The impregnated fibers are continuously transported to step (2);

[0049] (2) Drying and curing: Dry and curing the impregnated fibers. The filament bundle width is controlled to be 8 mm by adjusting the axial spacing of the cambered guide rollers for widening the bundle. The treatment temperature is 85°C and the treatment time is 8 min. This ensures that the broken fiber remover on the bundle is dried and cured uniformly and efficiently to obtain cured fibers. The cured fibers are continuously transported to step (3);

[0050] (3) Washing: After the solidified fiber is treated by the washing process, the broken fiber remover originally solidified on the surface will be dissolved, and the broken fibers and hairiness screened out under the shear force of "bundling" will be rinsed clean. Specific process: Control the water temperature to 70°C, the treatment time to 5 minutes, and add pure water at a rate of 3L / min in the form of running water overflow to ensure thorough cleaning. The treated fiber is continuously transported to process (4);

[0051] (4) The fiber is treated in the drying oven at the end, with the temperature controlled at 90°C and the treatment time being 3 minutes. The treated fiber is continuously transported to process (5);

[0052] (5) Use the take-up device to complete the collection of finished products.

[0053] After the above process, the number of broken fibers and hairiness of the 12k metal-plated carbon fiber is 3 pieces / 10cm, compared with 16 pieces / 10cm before the treatment, and the removal rate of broken fibers and hairiness is 81.3%.

[0054] Example 2

[0055] (1) Fiber impregnation: The 0.5k silicon carbide fiber to be treated is fed into a reagent tank containing a broken fiber remover, wherein the broken fiber remover contains, in addition to pure water, 5% of a 25% polyvinyl alcohol aqueous solution and 7% of an 8% chitosan aqueous solution. The solution temperature is 30°C and the treatment time is 1 minute. The fiber bundle is controlled to have a width of 1 mm. The impregnated fiber is continuously fed to step (2);

[0056] (2) Drying and curing: Dry and cure the impregnated fibers, control the width of the tow to be 1 mm, the treatment temperature to be 70°C, and the treatment time to be 5 min, to ensure that the broken fiber remover on the tow is dried and cured uniformly and efficiently. The cured fibers are continuously transported to process (3);

[0057] (3) Washing: After the solidified fiber is treated by the washing process, the broken fiber remover originally solidified on the surface will be dissolved, and the broken fibers and hairiness screened out under the shear force of "bundling" will be rinsed clean. Specific process: The water temperature is 70°C, the treatment time is 2 minutes, and pure water is added at a rate of 0.5L / min in the form of running water overflow to ensure thorough cleaning. The treated fiber is continuously transported to process (4);

[0058] (4) The fiber is treated in the drying oven at the end, with the temperature controlled at 90°C and the treatment time being 1 minute. The treated fiber is continuously transported to process (5);

[0059] (5) Use the take-up device to complete the collection of finished products.

[0060] After the above process, the number of broken filaments and hairiness of the 0.5k silicon carbide fiber treated is 2 pieces / 10cm, compared with 13 pieces / 10cm before treatment, the removal rate of broken filaments and hairiness is 84.6%.

[0061] Example 3

[0062] (1) Fiber impregnation: The 24k metal-coated carbon fiber to be treated is fed into a reagent tank containing a broken wire remover, wherein the broken wire remover contains, in addition to pure water, 20% of a 40% polyvinyl alcohol aqueous solution, 8% of a 15% chitosan aqueous solution, and 5% of a 0.1% benzotriazole methanol solution. The solution temperature is 35°C and the treatment time is 3 minutes. The axial spacing of the selected filament bundle widening arc guide roller is adjusted to control the filament bundle to have a width of 16 mm. The impregnated fibers are continuously transported to step (2);

[0063] (2) Drying and curing: Dry and curing the impregnated fibers. The filament bundle width is controlled to be 8 mm by adjusting the axial spacing of the cambered guide rollers for bundle widening. The treatment temperature is 100°C and the treatment time is 6 min. This ensures that the broken fiber remover on the bundle is dried and cured uniformly and efficiently to obtain cured fibers. The cured fibers are continuously transported to step (3);

[0064] (3) Washing: After the solidified fiber is treated by the washing process, the broken fiber remover originally solidified on the surface will be dissolved, and the broken fibers and hairiness screened out under the shear force of "bundling" will be rinsed clean. Specific process: Control the water temperature to 70°C, the treatment time to 5 minutes, and add pure water at a rate of 4L / min in the form of running water overflow to ensure thorough cleaning. The treated fiber is continuously transported to process (4);

[0065] (4) The fiber is treated in the drying oven at the end, with the temperature controlled at 110°C and the treatment time being 4 minutes. The treated fiber is continuously transported to process (5);

[0066] (5) Use the take-up device to complete the collection of finished products.

[0067] After the above process, the number of broken fibers and hairiness of the 24k metal-plated carbon fiber is 8 pieces / 10cm, compared with 39 pieces / 10cm before the treatment, and the removal rate of broken fibers and hairiness is 79.5%.

[0068] Comparative Example 1

[0069] The only difference from Example 1 is that no broken wire remover is added to the reagent tank, and the rest of the process is the same. The 12k metal-plated carbon fiber treated in this way has a statistical number of broken wires and hairiness of 26 pieces / 10cm, which is 62.5% higher than the number of broken wires and hairiness of 16 pieces / 10cm before treatment. After the metal-plated carbon fiber is processed without a broken wire removal reagent tank, the broken wires and hairiness increase due to the influence of the equipment transmission and friction mechanism.

[0070] Comparative Example 2

[0071] The difference from Example 3 is that only 8% of the 15% chitosan aqueous solution (pure water) is not added to the reagent tank, and the rest of the process is the same. The number of broken wires and hairiness of the 24k metal-plated carbon fiber treated in this way is 21 / 10cm, and the removal rate of broken wires and hairiness is 46.2% compared with 39 / 10cm before treatment. The results of Comparative Example 2 show that the combination of polyvinyl alcohol and chitosan can achieve a better broken wire cleaning effect by cross-linking.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A broken wire remover, characterized in that: Calculated by mass percentage, it comprises: 0.5-8% of polyvinyl alcohol, 0.25-1.25% of chitosan and the balance of water.

2. The broken wire remover according to claim 1, characterized in that: The invention also comprises 3-8% of a methanol solution of benzotriazole in terms of mass percentage; the mass concentration of benzotriazole in the methanol solution of benzotriazole is 0.1-0.2%.

3. A method for cleaning broken fibers, characterized in that: The method comprises the following steps: impregnating the fiber containing broken filaments with the broken filament remover according to claim 1 or 2; The impregnated fibers are dried and solidified, and the broken fibers in the fibers are further broken into smaller broken fibers to obtain solidified fibers; The solidified fiber is washed with water to dissolve the broken fiber remover and wash away the broken fibers.

4. The cleaning method according to claim 3, characterized in that: The drying and curing process is performed at a temperature of 50 to 100° C. and for a time of 5 to 10 minutes.

5. The cleaning method according to claim 3, characterized in that: The water temperature of the water washing is 60-80°C.

6. The cleaning method according to claim 3 or 5, characterized in that: The water washing is running water overflow washing.

7. The cleaning method according to claim 3, characterized in that: The fiber containing broken filaments is a rigid inorganic fiber.

8. The cleaning method according to claim 7, characterized in that: The rigid inorganic fibers include one or more of carbon fibers, basalt fibers, silicon carbide fibers, alumina fibers, and quartz fibers.

9. The cleaning method according to claim 3, characterized in that: The soaking temperature is 25-40°C.

10. The cleaning method according to claim 3, characterized in that: The fibers are impregnated, dried, solidified and washed under a widening condition.

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