A modified hollow long rod-shaped polyamide fiber and preparation method thereof

Abstract

The invention relates to the technical field of hollow long rod-shaped polyamide fibers for grease, and discloses a modified hollow long rod-shaped polyamide fiber and a preparation method thereof, wherein the polyamide fiber is synthesized from plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials, and the polyamide fiber is in the shape of a hollow long rod. The polyamide fiber is synthesized from plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials, and the polyamide fiber is modified to have good dispersibility and compatibility in base oil, can be evenly dispersed in grease, can significantly reduce the soap content in the grease, thereby reducing the cost of the grease, and increasing the service life of the grease. At the same time, it has good oil storage and release capacity, and can significantly improve the colloidal stability of lithium-based grease.

Description

Technical Field

[0001] The invention relates to the technical field of hollow long rod-shaped polyamide fibers for grease, and more specifically to a modified hollow long rod-shaped polyamide fiber and a preparation method thereof. Background Art

[0002] Polyamide fiber is referred to as PA, commonly known as nylon or nylon, which is a general term for thermoplastic resins containing repeated amide groups — [NHCO] — on the main chain of the molecule. It includes aliphatic PA, aliphatic-aromatic PA and aromatic PA. Among them, aliphatic PA has many varieties, large output and wide application. Its name is determined by the specific number of carbon atoms in the synthetic monomer. When used as a plastic, it is called nylon, and when used as a fiber, it is called nylon, which can be made into long fibers or short fibers.

[0003] At present, mechanical equipment usually uses grease when working. Grease is a kind of oily semi-solid used to lubricate mechanical parts, which can reduce friction and wear between mechanical parts. However, the high soap content of grease will lead to higher product costs. More importantly, it is easy to cause the bearing temperature to rise during the use of grease, accelerate oxidation, thereby shortening the service life of bearings and grease. In addition, when the storage temperature is high, the grease is easy to detach from the mesh structure skeleton and precipitate, resulting in oil separation. Therefore, the present application provides a modified hollow long rod polyamide fiber. By adding hollow long rod polyamide fiber to grease, the service life of bearings and grease can be increased. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a modified hollow long rod-shaped polyamide fiber and a preparation method thereof to solve the problems existing in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a modified hollow long rod-shaped polyamide fiber, wherein the polyamide fiber is synthesized from plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials, and the polyamide fiber is in the shape of a hollow long rod.

[0006] A method for preparing a modified hollow long rod-shaped polyamide fiber, characterized in that it comprises the following steps:

[0007] Step 1: Synthesis of polyamide fiber;

[0008] Step 2: solution preparation;

[0009] Step 3, modified polymerization reaction;

[0010] Step 4: Preparation of columnar fibers;

[0011] Step 5: Fiber processing.

[0012] Furthermore, in step 1, plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine are used as raw materials, the reaction conditions are heating to 200° in a nitrogen protection box, reacting for four hours, and dissolving polyamide with N,N-dimethylacetamide.

[0013] Furthermore, in step 2, the synthesized polyamide and the medium are mixed together to prepare a total solution, the mass fraction of the polyamide in the solution is 10% to 30%, and the mass fraction of the medium in the solution is 70% to 90%. During the mixing preparation process, the polyamide and the medium need to be stirred and mixed at a stirring speed of 500 to 520 rpm.

[0014] Furthermore, in step 2, the medium can be any one of tap water, ionized water or deionized water.

[0015] Furthermore, in step three, the total solution, the polymerizing agent and the compatibilizer are injected into the preparation tank, and the pH value is lowered to 5.5-6.0 by injecting 85% to 90% oxalic acid, so that the polymerizing agent reacts with the polyamide.

[0016] Furthermore, the polymerizer is broad bean acid salt. When the polymerizer, the compatibilizer and the polyamide react, the polymerizer is very easy to crystallize and precipitate. Therefore, the reaction tank needs to be heated and stirred to prevent the polymerizer from being deposited at the bottom. The heating temperature is 60 to 80° and the stirring speed is 100 to 120 rpm.

[0017] Furthermore, the compatibilizer can increase the density and weight of the polyamide fiber. The compatibilizer is absorbed into the fiber, which reduces the distance between the fibers, strengthens the interaction between the fibers, and increases the pores and accommodation space on the surface of the cellulose material, thereby modifying the fiber.

[0018] Furthermore, in step 4, the polyamide solution is sprayed into hollow polyamide fibers by jet spinning technology with the aid of high-speed hot air flow, and the polyamide fibers are stretched to a desired length, and then the polyamide fibers are cut to obtain hollow long rod-shaped polyamide fibers.

[0019] Furthermore, in step five, the polyamide fiber is washed and dried to finally obtain modified hollow long rod-shaped polyamide fiber. During the washing process, warm water of 30 to 40° is used, and the polyamide fiber is dried using an air flow dryer. The drying temperature is 50 to 60°, and the drying time is 4 to 6 hours. After drying, it needs to be stored in a dry, ventilated and cool place to avoid moisture or heat. At the same time, sealing measures need to be taken to prevent moisture in the air from affecting it.

[0020] Technical effects and advantages of the present invention:

[0021] 1. The present invention can significantly reduce the soap content in the grease by adding hollow long rod-shaped polyamide fibers to the grease, thereby reducing the grease cost and increasing the service life of the bearing and the grease.

[0022] 2. The present invention adds hollow long rod-shaped polyamide fibers to universal lithium-based grease, which can be evenly dispersed in the base oil, has good oil storage and release capabilities, can significantly improve the colloidal stability of the lithium-based grease, and prevent the serious oil separation phenomenon of the lithium-based lubricating oil.

[0023] 3. The polyamide fiber of the present invention uses plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials to synthesize a hollow long rod-shaped polyamide fiber, and the polyamide fiber is modified to have good dispersibility and compatibility in the base oil and can be evenly dispersed in the grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a flow chart of a method for preparing a modified hollow long rod-shaped polyamide fiber. DETAILED DESCRIPTION

[0025] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are only examples. The modified hollow long rod-shaped polyamide fiber and the preparation method thereof involved in the present invention are not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] like Figure 1 As shown, a modified hollow long rod-shaped polyamide fiber is synthesized from plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials. The polyamide fiber is in the shape of a hollow long rod.

[0028] In this embodiment, the polyamide fiber is synthesized into a hollow long rod-shaped polyamide fiber using plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials, and the polyamide fiber is modified to have good dispersibility and compatibility in the base oil and can be evenly dispersed in the grease, which can significantly reduce the soap content in the grease, thereby reducing the cost of the grease and increasing the service life of the bearing and the grease. At the same time, it has good oil storage and release capabilities and can significantly improve the colloidal stability of the lithium-based grease.

[0029] Embodiment 2:

[0030] like Figure 1As shown, a method for preparing a modified hollow long rod-shaped polyamide fiber comprises the following steps:

[0031] Step 1: Synthesis of polyamide fiber;

[0032] Step 2: solution preparation;

[0033] Step 3, modified polymerization reaction;

[0034] Step 4: Preparation of columnar fibers;

[0035] Step 5: Fiber processing;

[0036] In step 1, plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine are used as raw materials, the reaction conditions are that the nitrogen protection box is heated to 200°, the reaction is performed for four hours, and the polyamide is dissolved with N,N-dimethylacetamide. In step 2, the synthesized polyamide and the medium are mixed together to prepare a total solution, the mass fraction of the polyamide in the solution is 10% to 30%, and the mass fraction of the medium in the solution is 70% to 90%. During the mixing preparation process, the polyamide and the medium need to be stirred and mixed, and the stirring speed is 500 to 5 20 rpm, in step 2, the medium can be any one of tap water, ionized water or deionized water, in step 3, the total solution, the polymerizer and the extender are injected into the preparation tank, and the pH value is lowered to 5.5-6.0 by injecting 85% to 90% of oxalic acid, so that the polymerizer reacts with the polyamide, the polymerizer is broad bean salt, and when the polymerizer, the extender and the polyamide react, the polymerizer is very easy to crystallize and precipitate, so it is necessary to heat the reaction tank and stir to prevent the polymerizer from being deposited at the bottom, and the heating temperature is 60 to 80°, the stirring speed is 100 to 120 rpm, the compatibilizer can increase the density and weight of the polyamide fiber, the compatibilizer is absorbed into the fiber, the fiber spacing is reduced, the interaction between the fibers is strengthened, the pores and the accommodation space on the surface of the cellulose material are increased, and the fiber is modified. In step 4, the polyamide solution is sprayed into hollow polyamide fibers by jet spinning technology with the help of high-speed hot air flow, and the polyamide fiber is stretched to a desired length, and then the polyamide fiber is cut to obtain a hollow long rod-shaped polyamide fiber. In step 5, the polyamide fiber is washed and dried to finally obtain a modified hollow long rod-shaped polyamide fiber. During the washing process, warm water of 30 to 40° is used, and the drying process uses an air flow dryer to dry the polyamide fiber. The drying temperature is 50 to 60° and the drying time is 4 to 6 hours. After drying, it needs to be stored in a dry, ventilated and cool place to avoid moisture or heat. At the same time, sealing measures need to be taken to prevent moisture in the air from affecting it.

[0037] In this embodiment, when preparing polyamide fibers, the density and weight of the polyamide fibers can be increased by adding a compatibilizer. The compatibilizer is absorbed into the fibers, reducing the distance between the fibers, strengthening the interaction between the fibers, and increasing the pores and accommodation space on the surface of the cellulose material, thereby modifying the fibers.

[0038] In summary, if Figure 1 As shown, a modified hollow long rod polyamide fiber and a preparation method thereof, using plant-based dimer acid and hexamethylenediamine with a long alkyl carbon chain structure as raw materials, the reaction conditions are heating a nitrogen protection box to 200°, reacting for four hours, dissolving polyamide with N,N-dimethylacetamide, and then mixing the synthesized polyamide and the medium together to prepare a total solution, the mass fraction of polyamide in the solution is 10% to 30%, and the mass fraction of the medium in the solution is 70% to 90%. During the mixing and preparation process, the polyamide and the medium need to be stirred and mixed, and the stirring speed is 500 to 520 rpm, and then the total solution, the polymerizer and the compatibilizer are injected into the preparation tank, and the pH value is reduced to 5.5-6.0 by injecting 85% to 90% oxalic acid, so that the polymerizer reacts with the polyamide. When the polymerizer, the compatibilizer react with the polyamide, the polymerizer is very easy to crystallize and precipitate, so it is necessary to heat the reaction tank and stir to prevent the polymerizer from being deposited at the bottom. The compatibilizer can increase the density and weight of the polyamide fiber. The compatibilizer is absorbed into the fiber, which reduces the distance between the fibers, strengthens the interaction between the fibers, and increases the pores and accommodation space on the surface of the cellulose material, thereby modifying the fiber. Then, through the jet spinning technology, with the help of high-speed hot air flow, the polyamide solution is sprayed into hollow polyamide fibers, and the polyamide fibers are stretched to the required length, and then the polyamide fibers are cut to obtain hollow long rod-shaped polyamide fibers. Finally, the fibers are cleaned and dried to obtain modified hollow long rod-shaped polyamide fibers. During the cleaning process, warm water of 30 to 40° is used. The polyamide fibers are dried using an air flow dryer at a drying temperature of 50 to 60° and a drying time of 4 to 6 hours. After drying, they need to be stored in a dry, ventilated, and cool place to avoid moisture or heat. At the same time, sealing measures need to be taken to prevent moisture in the air from affecting them.

[0039] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0040] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0041] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a modified hollow long rod-shaped polyamide fiber, characterized in that: The polyamide fiber is synthesized from plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine as raw materials, and the polyamide fiber is in the shape of a hollow long rod; The following steps are involved: Step 1, polyamide synthesis; Step 2: solution preparation; Step 3, modified polymerization reaction; Step 4: Preparation of columnar fibers; Step 5: Fiber processing; In step 1, plant-based dimer acid with a long alkyl carbon chain structure and hexamethylenediamine are used as raw materials, the reaction conditions are heating to 200° in a nitrogen protection box, reacting for four hours, and dissolving polyamide with N,N-dimethylacetamide; In step 2, the synthesized polyamide and the medium are mixed together to prepare a total solution, wherein the mass fraction of the polyamide in the solution is 10% to 30%, and the mass fraction of the medium in the solution is 70% to 90%. During the mixing and preparation process, the polyamide and the medium are stirred and mixed at a stirring speed of 500 to 520 revolutions per minute; In step 2, the medium is any one of tap water, ionized water or deionized water; In step 3, the total solution, the polymerizing agent and the compatibilizer are injected into the preparation tank, and the pH value is lowered to 5.5-6.0 by injecting 85% to 90% oxalic acid, so that the polymerizing agent reacts with the polyamide; The polymerizer is broad bean acid salt. When the polymerizer, the compatibilizer and the polyamide react, the reaction tank is heated and stirred to prevent the polymerizer from being deposited at the bottom. The heating temperature is 60 to 80° and the stirring speed is 100 to 120 rpm. The compatibilizer is used to modify the fiber. In step 4, the polyamide solution is sprayed into hollow polyamide fibers by jet spinning technology with the aid of high-speed hot air flow, and the polyamide fibers are stretched to a desired length and then cut to obtain hollow long rod-shaped polyamide fibers.

2. The method for preparing a modified hollow long rod-shaped polyamide fiber according to claim 1, characterized in that: In step five, the polyamide fiber is washed and dried to finally obtain a modified hollow long rod polyamide fiber. During the washing process, warm water of 30 to 40° is used. The polyamide fiber is dried using an air flow dryer at a drying temperature of 50 to 60° for 4 to 6 hours. After drying, the fiber is stored in a dry, ventilated and cool place, and sealing measures are taken.

Images