Anti-fatigue damper and preparation process thereof

Abstract

The invention discloses an anti-fatigue damper and a preparation process thereof.The anti-fatigue damper is prepared from, by mass, 75%-80% of blended base cloth, 20%-25% of F-type modified phenolic resin and 1%-2% of additives, and the preparation process comprises the steps that firstly, blended spinning is conducted; 2, weaving the base cloth; 3, preparing a resin solution; step 4, dipping; step 5, drying; sixthly, hot press molding and curing are conducted; step 7, post-processing; the polyester fibers, the cotton fibers and the bamboo fibers are used for weaving the blended base cloth, the damper manufactured on the basis of the blended base cloth has excellent fatigue resistance and compliance, is high in structural stability and good in temperature resistance and moisture resistance, can bear mechanical impact caused by high-frequency vibration while guaranteeing the naturalness and reduction degree of acoustic output, and can be used for manufacturing the damper. The problem that the performance of an existing damper is attenuated too fast under long-term vibration is solved.

Description

A fatigue-resistant elastic wave and its preparation process Technical Field

[0001] This invention relates to the field of acoustic device technology, specifically to an anti-fatigue elastic wave and its fabrication process. Background Technology

[0002] As a core functional component of acoustic devices such as loudspeakers and speakers, the performance of the spider directly determines the sound fidelity, operational stability, and lifespan of acoustic products. In evaluating spider performance, compliance directly affects the smoothness of sound wave transmission, determining the naturalness and fidelity of the sound quality; fatigue resistance relates to the performance degradation rate of the spider under long-term high-frequency vibration conditions, and is crucial for ensuring the long-term reliable operation of acoustic devices. However, existing spiders and their manufacturing processes have unavoidable drawbacks: spiders made with acrylic-based materials using cold-pressing processes can achieve excellent compliance due to the material's inherent flexibility, but the molecular structure of acrylic materials makes them prone to permanent deformation under long-term high-frequency vibration, resulting in insufficient fatigue resistance and failing to meet the demands of high-load, long-life applications; while some spiders made with base fabric improve structural stability and fatigue resistance, this often comes at the cost of some compliance, leading to distortion during sound transmission and making it difficult to match the sound fidelity requirements of mid-to-high-end acoustic products. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-fatigue elastic wave and its preparation process to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an anti-fatigue elastic wave, the formulation of which includes: a blended base fabric, F-type modified phenolic resin and additives, wherein the mass percentage content of each component is: 75-80% blended base fabric, 20-25% F-type modified phenolic resin and 1-2% additives.

[0005] The blended base fabric has a formulation of formulation A and formulation B. Formulation A includes polyester fiber, cotton fiber and bamboo fiber, with each component having a mass percentage content of 15-85% polyester fiber, 3-68% cotton fiber and 3-68% bamboo fiber, respectively. Formulation B includes polyester fiber and bamboo fiber, with each component having a mass percentage content of 15-85% polyester fiber and 15-85% bamboo fiber, respectively.

[0006] The polyester fiber is selected from filaments with a fineness of 1.5-2.0D, the cotton fiber is selected from long-staple cotton with a length of 38-40mm, and the bamboo fiber is selected from refined fibers with a fineness of 2.0-2.5D and a moisture content of ≤8%. The bamboo fiber is pretreated with low-temperature plasma at a power of 300-400W for 3-5 minutes.

[0007] A process for preparing fatigue-resistant elastic wave includes the following steps: Step 1, blended spinning; Step 2, weaving a base fabric; Step 3, preparing a resin solution; Step 4, impregnation; Step 5, drying; Step 6, hot pressing and curing; and Step 7, post-treatment. In Step 1, fiber raw materials are prepared according to the blended base fabric formula ratio and then blended to form yarn. In Step 2, the yarn is woven into a base fabric according to structural density requirements. In Step 3, F-type modified phenolic resin and additives are added to a solvent and mixed evenly to obtain a resin solution. In Step 4, the base fabric is impregnated in the resin solution. In Step 5, the resin-impregnated base fabric is dried. In Step 6, the dried base fabric is placed in an elastic wave mold and cured by hot pressing to obtain an elastic wave blank. In Step 7, the elastic wave blank is precisely cut according to product dimensions, and after removing burrs, fatigue-resistant elastic wave is obtained.

[0008] In step three, the mass ratio of solvent to F-type modified phenolic resin is 3-5:16. The solvent is one of acetone, butanone, or ethyl acetate, and the additive is one of KH-550, KH-560, or KH-570.

[0009] In step three, the stirring speed is 200-300 r / min, the stirring time is 45-60 min, and the viscosity of the resin solution is controlled at 500-800 mPa·s.

[0010] In step three, the resin solution is filtered using a 200-300 mesh stainless steel filter. The filtered resin solution is then subjected to vacuum degassing treatment with a vacuum degree of -0.08 to -0.09 MPa and a degassing time of 15-20 minutes.

[0011] In step four, the impregnation method is vacuum impregnation, with a vacuum degree of -0.07 to -0.08 MPa and an impregnation time of 5-8 minutes.

[0012] In step five, the drying temperature is 60-70℃ and the drying time is 10-15 minutes.

[0013] In step six, the hot pressing parameters are: temperature 120-150℃, pressure 5-8MPa, heat and pressure holding for 3-5 minutes, and cooling to room temperature at a rate of 5-8℃ / min after hot pressing.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a blended base fabric woven from polyester fiber, cotton fiber and bamboo fiber. The spinner made based on this blended base fabric has excellent fatigue resistance and compliance, as well as strong structural stability and good temperature and moisture resistance. While ensuring the naturalness and fidelity of the acoustic output, it can withstand the mechanical impact of high frequency vibration, thus solving the problem of excessive performance decay of existing acrylic spinners under long-term vibration. Attached Figure Description

[0015] Figure 1 is a process flow diagram of the present invention; Figure 2 is the first mechanical performance curve of the experimental example wave; Figure 3 is the second mechanical performance curve of the experimental example wave. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please refer to Figures 1-3. One technical solution provided by this invention is as follows: Example 1: An anti-fatigue elastic wave, the formula of which includes: a blended base fabric, F-type modified phenolic resin, and additives. The mass percentage content of each component is as follows: 76.2% blended base fabric, 22% F-type modified phenolic resin, and 1.8% additives. The F-type modified phenolic resin is F-61 modified epoxy resin, and the additive is KH-550. The mass percentage content of each component in the blended base fabric is as follows: 65% polyester fiber, 17.5% bamboo fiber, and 17.5% cotton fiber. The polyester fiber is selected from filaments with a fineness of 1.5-2.0D, the cotton fiber is selected from long-staple cotton with a length of 38-40mm, and the bamboo fiber is selected from refined fibers with a fineness of 2.0-2.5D and a moisture content ≤8%. The bamboo fiber is pretreated with low-temperature plasma at a power of 350W for 4 minutes.

[0018] A process for preparing fatigue-resistant elastic waves includes the following steps: Step 1, blended spinning; Step 2, weaving a base fabric; Step 3, preparing a resin solution; Step 4, impregnation; Step 5, drying; Step 6, hot pressing and curing; and Step 7, post-treatment. In Step 1, fiber raw materials are prepared according to the blended base fabric formulation ratio and then blended to form yarn. In Step 2, the yarn is woven into a base fabric according to structural density requirements. In Step 3, F-type modified phenolic resin and additives are added to a solvent, mixed and stirred evenly to obtain a resin solution. The mass ratio of solvent to F-type modified phenolic resin is 5:16. Acetone is used as the solvent. The stirring speed is 250 r / min, the stirring time is 60 min, the viscosity of the resin solution is controlled at 600 mPa·s, and the resin solution is filtered through a 200-mesh stainless steel filter. The filtered resin solution is subjected to vacuum degassing treatment at a vacuum degree of -0.08 MPa for 18 minutes. In step four, the base fabric is impregnated in the resin solution using vacuum impregnation at a vacuum degree of -0.08 MPa for 7 minutes. In step five, the resin-impregnated base fabric is dried at a temperature of 65°C for 12 minutes. In step six, the dried base fabric is placed in a spring mold and cured by hot pressing to obtain a spring blank. The hot pressing parameters are: temperature 130°C, pressure 6 MPa, and holding pressure for 4 minutes. After hot pressing, it is cooled to room temperature at a rate of 6°C / min. In step seven, the spring blank is precisely cut to the product size, and after removing burrs, a spring with product model PCS-02 is obtained.

[0019] Example 2: A fatigue-resistant elastic fabric, the formulation of which includes: a blended base fabric, F-type modified phenolic resin and additives, the mass percentage content of each component is as follows: 77.4% blended base fabric, 21% F-type modified phenolic resin and 1.6% additives, the F-type modified phenolic resin is F-61 modified epoxy resin, the additive is KH-550, the mass percentage content of each component in the blended base fabric is as follows: 50% polyester fiber, 25% cotton fiber and 25% bamboo fiber; the process is the same as in Example 1, except that the blended yarn count is changed to 10S / 3 and the weaving structure density is changed to 22×22, to obtain an elastic fabric with product model PCS-03.

[0020] Example 3: A fatigue-resistant elastic fabric, the formulation of which includes: a blended base fabric, F-type modified phenolic resin and additives. The mass percentage content of each component is as follows: 78.5% blended base fabric, 20% F-type modified phenolic resin and 1.5% additives. The F-type modified phenolic resin is F-51 modified epoxy resin, and the additive is KH-550. The mass percentage content of each component in the blended base fabric is as follows: 35% polyester fiber, 32.5% cotton fiber and 32.5% bamboo fiber. The process is the same as in Example 1, except that the blended yarn count is changed to 10S / 2 and the weaving structure density is changed to 25×25, resulting in an elastic fabric with product model PCS-05.

[0021] Example 4: A fatigue-resistant elastic fabric, the formulation of which includes: a blended base fabric, F-type modified phenolic resin and additives, the mass percentage content of each component is as follows: 77.2% blended base fabric, 21% F-type modified phenolic resin and 1.8% additives, the F-type modified phenolic resin is F-51 modified epoxy resin, the additive is KH-560, the mass percentage content of each component in the blended base fabric is as follows: 65% polyester fiber and 35% bamboo fiber; the process is the same as in Example 1, except that the blended yarn count is changed to 20S / 2 and the weaving structure density is changed to 32×32, to obtain an elastic fabric with product model PCS-15.

[0022] Example 5: A fatigue-resistant elastic fabric, the formulation of which includes: a blended base fabric, F-type modified phenolic resin and additives, the mass percentage content of each component is as follows: 78.8% blended base fabric, 20% F-type modified phenolic resin and 1.2% additives, the F-type modified phenolic resin is F-44 modified epoxy resin, the additive is KH-570, the mass percentage content of each component in the blended base fabric is as follows: 50% polyester fiber and 50% bamboo fiber; the process is the same as in Example 1, except that the blended yarn count is changed to 30S / 2 and the weaving structure density is changed to 38×38, to obtain an elastic fabric with product model PCS-12.

[0023] Example 6: A fatigue-resistant elastic fabric, the formulation of which includes: a blended base fabric, F-type modified phenolic resin and additives, the mass percentage content of each component is as follows: 77.2% blended base fabric, 21% F-type modified phenolic resin and 1.8% additives, the F-type modified phenolic resin is F-51 modified epoxy resin, the additive is KH-560, the mass percentage content of each component in the blended base fabric is as follows: 35% polyester fiber and 65% bamboo fiber; the process is the same as in Example 1, except that the blended yarn count is changed to 20S / 2 and the weaving structure density is changed to 32×32, to obtain an elastic fabric with product model PCSB-15.

[0024] Comparative Examples: The spring wave of the present invention was compared with commercially available high-end spring waves (N-series acrylic-based spring waves), mid-range spring waves (NC-series Conex and cotton fiber blended spring waves), and conventional spring waves (PCK-series PCK worsted fabric spring waves) in a comparative experiment to test fatigue resistance, undistorted displacement and displacement amount, and environmental stability. For fatigue testing of displacement change rate, the sample size was 30 pieces, and the test conditions were an amplitude of 6 mm / side, a vibration frequency of 900 times / min, and a cumulative vibration duration of 720 min. For environmental testing of displacement change, the sample size was 10 pieces, and test conditions A were 80℃ temperature, 90%RH humidity, and 72h test time; test conditions B were 20℃ temperature, 90%RH humidity, and 72h test time. The experimental results are shown in Tables 3 and 4, and the mechanical performance curves are shown in Figures 2-3. The experimental results show that the undistorted displacement of the spring wave of the present invention is comparable to that of the N-series spring waves, its fatigue resistance is comparable to that of the NC-series spring waves, and its fatigue resistance is superior to that of the PCK-series spring waves.

[0025] Table 1. Formulations and process parameters for each embodiment Table 2. Elastic properties of the samples prepared in each embodiment Table 3 Experimental Results (I) Table 4 Experimental Results (II) Based on the above, this invention uses a blended base fabric woven from polyester fiber, cotton fiber, and bamboo fiber. Polyester fiber provides structural strength and resistance to deformation, ensuring the basic mechanical properties of the spinneret. Cotton fiber improves inter-fiber compatibility and spinneret compliance, optimizing vibration transmission. The natural high strength and fatigue resistance of bamboo fiber enhance the spinneret's fatigue resistance. Spinnerets made from this blended base fabric have the following advantages: outstanding fatigue resistance, with a displacement rate lower than the PCK series spinnerets and comparable to the mainstream mid-range NC series spinnerets, solving the problem of rapid performance decay under long-term vibration of traditional spinnerets; excellent compliance and fidelity, with a longer distortion-free displacement length than the PCK and NC series spinnerets, and stable displacement under a 200g load, ensuring accurate acoustic output; balanced mechanical properties, with tensile strength and spinneret tensile force adapted to practical application requirements, and strong structural stability; good environmental adaptability, with environmental testing displacement rate controlled at a low level, and reliable temperature and humidity resistance.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fatigue-resistant ballistic missile, comprising: The blended base fabric, F-type modified phenolic resin, and additives are characterized in that the mass percentage content of each component is: 75-80% blended base fabric, 20-25% F-type modified phenolic resin, and 1-2% additives.

2. The fatigue-resistant ballistic wave according to claim 1, characterized in that: The blended base fabric has a formulation of formulation A and formulation B. Formulation A includes polyester fiber, cotton fiber and bamboo fiber, with each component having a mass percentage content of 15-85% polyester fiber, 3-68% cotton fiber and 3-68% bamboo fiber, respectively. Formulation B includes polyester fiber and bamboo fiber, with each component having a mass percentage content of 15-85% polyester fiber and 15-85% bamboo fiber, respectively.

3. The fatigue-resistant slingshot according to claim 2, characterized in that: The polyester fiber is selected from filaments with a fineness of 1.5-2.0D, the cotton fiber is selected from long-staple cotton with a length of 38-40mm, and the bamboo fiber is selected from refined fibers with a fineness of 2.0-2.5D and a moisture content of ≤8%. The bamboo fiber is pretreated with low-temperature plasma at a power of 300-400W for 3-5 minutes.

4. A process for preparing fatigue-resistant elastic waves, comprising: step one, blended spinning; step two, weaving a base fabric; step three, preparing a resin solution; step four, impregnation; step five, drying; step six, hot pressing and curing; and step seven, post-treatment; characterized in that: In step one above, fiber raw materials are prepared according to the blended base fabric formula ratio and then blended into yarn; in step two above, the yarn is woven into base fabric according to the structural density requirements. In step three above, the F-type modified phenolic resin and additives are added to the solvent and mixed and stirred evenly to obtain a resin solution; in step four above, the base fabric is impregnated in the resin solution. In step five above, the base fabric impregnated with resin solution is dried; in step six above, the dried base fabric is placed in a spring mold and cured by hot pressing to obtain a spring blank. In step seven above, the spring wave blank is precisely cut according to the product size, and after removing the burrs, fatigue-resistant spring waves are obtained.

5. The preparation process of the fatigue-resistant elastic wave according to claim 4, characterized in that: In step three, the mass ratio of solvent to F-type modified phenolic resin is 3-5:

16. The solvent is one of ethanol, isoacetone, acetone, butanone, or ethyl acetate, and the additive is one of KH-550, KH-560, or KH-570.

6. The preparation process of the fatigue-resistant elastic wave according to claim 4, characterized in that: In step three, the stirring speed is 200-300 r / min, the stirring time is 45-60 min, and the viscosity of the resin solution is controlled at 500-800 mPa·s.

7. The preparation process of the fatigue-resistant elastic wave according to claim 4, characterized in that: In step three, the resin solution is filtered using a 200-300 mesh stainless steel filter. The filtered resin solution is then subjected to vacuum degassing treatment with a vacuum degree of -0.08 to -0.09 MPa and a degassing time of 15-20 minutes.

8. The preparation process of the fatigue-resistant elastic wave according to claim 4, characterized in that: In step four, the impregnation method is vacuum impregnation, with a vacuum degree of -0.07 to -0.08 MPa and an impregnation time of 5-8 minutes.

9. The preparation process of the fatigue-resistant elastic wave according to claim 4, characterized in that: In step five, the drying temperature is 60-70℃ and the drying time is 10-15 minutes.

10. The preparation process of the fatigue-resistant elastic wave according to claim 4, characterized in that: In step six, the hot pressing parameters are: temperature 120-150℃, pressure 5-8MPa, heat and pressure holding for 3-5 minutes, and cooling to room temperature at a rate of 5-8℃ / min after hot pressing.

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