High-performance fiber aramid fiber for aerospace composite material and preparation method of high-performance fiber aramid fiber

Abstract

The invention provides a high-performance fiber aramid fiber for an aerospace composite material and a preparation method thereof, and relates to the technical field of materials, the preparation method is characterized by comprising the following steps: step 1, carrying out fine screening treatment on p-phenylenediamine and paraphthaloyl chloride, inspecting and weighing; step 2, putting the corresponding raw materials and dimethylacetamide into a reaction device together, and mixing and reacting in a low-temperature state; step 3, separating and collecting the corresponding waste materials and the raw materials, and carrying out precipitation and filtration; 4, cleaning and drying the material obtained in the step 3, placing the material in a spinning device, and discharging the material by a corresponding extrusion stretching mechanism; step 5, collecting the material in the step 4 into a cleaning pool, washing and neutralizing with clear water, and carrying out surface treatment; and 6, the material in the step 5 is taken out, dried and heated, and machining is completed. The method has the advantages that the overall fiber aramid processing efficiency can be improved, and the overall chemical stability can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to high-performance fiber aramid for aerospace composites and a preparation method thereof. BACKGROUND

[0002] Aramid fiber is a high-performance synthetic fiber with high strength and modulus, light weight, and has been widely used in various fields, especially in the aviation industry, because it has the characteristics of high temperature resistance, chemical stability and convenient processing, especially important in wings, protection and related accessories, but the overall processing efficiency of the existing aramid fiber manufacturing process is low, and the overall strength and chemical stability of the produced aramid fiber are still insufficient, so it cannot meet the current production and use requirements. SUMMARY

[0003] The purpose of the present application is to provide high-performance fiber aramid for aerospace composites and a preparation method thereof, which solves the technical problems of slow overall efficiency in the existing preparation process and poor chemical stability of the processed products, and achieves the technical effects of improving the overall preparation efficiency and improving the chemical stability of the products.

[0004] In order to achieve the above-mentioned application purpose, the technical scheme adopted by the present application is:

[0005] The preparation method of high-performance fiber aramid for aerospace composites comprises the following steps:

[0006] Step 1, finely screen p-phenylenediamine and p-phenylenediamine chloride, and extract part for sample inspection, after screening, accurately weigh the raw materials;

[0007] Step 2, put the corresponding raw materials and dimethylacetamide into the reaction device together, and mix under low temperature, after completing the mixing reaction, add potassium hydroxide, dimethyl sulfoxide and nanofiber in turn, and mix the fiber material fully by dispersion liquid;

[0008] Step 3, separate and collect the corresponding waste materials from the raw materials, and perform sedimentation filtration, which needs to be collected separately for the filtration waste;

[0009] Step 4, after cleaning and drying the material completed in step 3, place it in a spinning device, the principle of which is dry spraying wet spinning, which is discharged by the corresponding extrusion stretching mechanism;

[0010] Step 5, collect the material in step 4 to a clean pool, wash and neutralize with clean water, add acetic acid to adjust the acidity and alkalinity and cool down, then replace another group of pool to add lithium chloride and amino acid surfactant for surface treatment;

[0011] Step 6, the material in step 5 is taken out for drying and heating, and then stretched according to the use requirement, and after preparation, sampling detection is needed again.

[0012] As an improvement, the raw materials after accurate weighing in step 1 are collected uniformly, and after collecting a unit processing amount, they are weighed again, and the raw materials are screened and weighed, and the phenylenediamine and terephthaloyl chloride are in equimolar ratio.

[0013] As an improvement, the reaction temperature in step 2 needs to be controlled between-3℃ and 0℃, the mixing reaction time is 16 to 18 hours, and the subsequent raw materials need to be put into mixing for a few times with an interval of at least 2 minutes.

[0014] As an improvement, the waste raw materials in step 3 need to be carried out in the case of dust isolation, and there is no waste gas leakage, the concentration of the suspension in the sedimentation tank in step 3 is 0.10.2% by mass percentage, and the concentration of the mixed solution is 1% by mass percentage.

[0015] As an improvement, the drying temperature in step 6 is 106℃ to 108℃, the drying forming corresponding pressure is 0.02 to 1.1Mpa, and the time is 2 to 5 hours.

[0016] The beneficial effects of the present application are: by finely controlling the mixing of various raw materials, the overall processing quality and effect can be improved, cooperating with multiple sedimentation filtration, the raw material screening can be fully carried out, the final product quality is improved, by cooperating with the use of multiple additives, the chemical stability of the material can be more stable, and the processing time is reduced, and the overall processing efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The flowchart of the high-performance fiber aramid for aerospace composite materials and the preparation method thereof. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second" in the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0020] As shown in Figure 1 The preparation method of high-performance fiber aramid for aerospace composites includes the following steps: step 1, fine screening treatment is carried out on phenylenediamine and terephthaloyl chloride, and part of it is extracted for sample inspection, and after screening, the raw materials are accurately weighed; step 2, the corresponding raw materials and dimethylacetamide are put into the reaction device together, and mixed reaction is carried out under low temperature, after the completion of the full mixing reaction, potassium hydroxide, dimethyl sulfoxide and nanofiber are added in turn, and the fiber material is fully mixed by the dispersion liquid; step 3, the corresponding waste and raw materials are separated and collected, and are subjected to sedimentation filtration, which needs to be collected separately for the filtration waste; step 4, the material completed in step 3 is cleaned and dried and placed in a spinning device, the principle of the spinning device is dry spraying wet spinning, which is discharged by the corresponding extrusion stretching mechanism; step 5, the material in step 4 is collected into a clean pool, washed with clean water, and acetic acid is added to adjust the acidity and alkalinity and to cool down, then another group of pool is replaced to add lithium chloride and amino acid surfactant for surface treatment; step 6, the material in step 5 is taken out for drying and heating, then stretched according to the use requirements, and sampling detection is needed again after preparation. When used, each production equipment includes a plurality of sensors and wireless signal transmission devices, and the processing data information is uniformly uploaded to the terminal for real-time supervision, the real-time supervision can identify the information according to the preset material processing data information, and alarm processing is carried out for abnormal information.

[0021] The raw materials precisely weighed in step 1 are collected uniformly, and after collecting a unit processing amount, they are weighed again and screened. The phenylenediamine and terephthaloyl chloride are mixed in an equimolar ratio. The reaction temperature in step 2 needs to be controlled between -3°C and 0°C, and the mixing reaction time is 16 to 18 hours. The subsequent raw materials need to be added to the mixture in small quantities and multiple times, with an interval of at least 2 minutes. The waste material in step 3 needs to be handled in a dust-free environment, and there is no waste gas leakage. The concentration of the suspension in the sedimentation tank in step 3 is 0.10.2% by mass percentage, and the concentration of the mixed solution is 1% by mass percentage. The drying temperature in step 6 is 106°C to 108°C, the drying forming pressure is 0.02 to 1.1 Mpa, and the time is 2 to 5 hours. The mixing reaction device in step 1 needs to be stirred after adding the dispersion liquid, the stirring speed of the corresponding mixer is 2000 rpm to 3500 rpm, and the overall processing time is 20 to 30 minutes.

[0022] When in use, the operator can supervise in real time through a remote control terminal, including the primary processing of raw materials, mixing reaction, waste and raw material processing, sedimentation filtration, spinning, cleaning and post-processing. After the treatment of the dispersion liquid, the fiber aramid can be fully integrated with another nanofiber to realize the preparation of a composite material, improve the overall strength and shorten the overall forming time. After filtration collection and spinning, the corresponding additives can make the relationship between the structures more closely, and a layer of protective structure will also be covered on the surface, making the overall chemical stability better.

[0023] The above only describes the preferred embodiments of the present patent, and does not limit the present patent. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present patent should be included in the protection scope of the present patent.

Claims

1. A process for the production of high performance fibres aramid for aerospace composites, characterised in that, It comprises the following steps: Step 1, fine screening treatment is carried out on p-phenylenediamine and terephthaloyl chloride, and part of it is extracted for sample inspection, after the screening is completed, the raw materials are accurately weighed; Step 2, the corresponding raw materials and dimethylacetamide are put into the reaction device and mixed at low temperature, after the reaction is completed, potassium hydroxide, dimethyl sulfoxide and nanofiber are added in turn, and the fiber material is fully mixed by dispersion liquid; Step 3, the corresponding waste and raw materials are separated and collected, and are subjected to sedimentation filtration, which needs to be collected separately for filtering waste; Step 4, the material completed in step 3 is cleaned and dried and placed in a spinning device, the principle of which is dry spraying wet spinning, which is discharged by the corresponding extrusion stretching mechanism; Step 5, the material in step 4 is collected into a clean pool, washed with clean water, and acetic acid is added to adjust the acidity and alkalinity and cool down, and then another group of pool is replaced to add lithium chloride and amino acid surfactant for surface treatment; Step 6, the material in step 5 is taken out for drying and heating, then stretched according to the use requirements, and needs to be sampled and detected again after preparation.

2. The process for the production of high performance fiber aramid for aerospace composites as claimed in claim 1 wherein, The raw materials accurately weighed in step 1 are collected uniformly, and after the unit processing amount is collected, they are weighed again, and the raw materials are screened and weighed, and the p-phenylenediamine and terephthaloyl chloride are in equimolar ratio.

3. The process for the production of high performance fiber aramid for aerospace composites as claimed in claim 1 wherein, The reaction temperature in step 2 needs to be controlled between-3℃ and 0℃, the mixing reaction time is 16 to 18 hours, and the subsequent raw materials need to be put into the mixture for a few times, and the interval time is at least 2 minutes.

4. The process for the production of high performance fiber aramid for aerospace composites as claimed in claim 1 wherein, The waste raw materials in step 3 need to be carried out in the case of dust isolation, and there is no waste gas leakage, the concentration of the suspension in the sedimentation tank in step 3 is 0.10.2% by mass percentage, and the concentration of the corresponding mixed liquid is 1% by mass percentage.

5. The process for the production of high performance fiber aramid for aerospace composites as claimed in claim 1 wherein, The drying temperature in step 6 is 106℃ to 108℃, the drying forming pressure is 0.02 to 1.1Mpa, and the time is 2 to 5 hours.

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