Anticorrosive protective material for microphone and preparation method thereof

Abstract

This invention relates to the technical field of modified polyurethane anti-corrosion materials for microphones, specifically to an anti-corrosion protective material for microphones and its preparation method. This anti-corrosion protective material for microphones uses modified polyurethane resin as the main material, with the addition of nanofillers, coupling agents, wetting and dispersing agents, defoamers, film-forming aids, and solvent A in a synergistic compound. After curing, this system, applied directly to the microphone's PCBA circuit board and electronic components, provides comprehensive hydrophobic, oleophobic, moisture-proof, and corrosion-resistant nano-coating protection, achieving superior hydrophobic, oleophobic, and anti-corrosion effects, preventing the microphone from being corroded by e-liquid, leading to reduced overall performance or even malfunction.

Description

Technical Field

[0001] This invention relates to the technical field of modified polyurethane anti-corrosion materials for microphones, specifically to an anti-corrosion protective material for microphones and its preparation method. Background Technology

[0002] The electronic cigarette microphone, also known as an airflow sensor or microphone chip, is the core component of an electronic cigarette used to detect smoking actions and drive corresponding functions. Its main functions include: 1. Detecting airflow: The microphone can sensitively detect changes in airflow generated when the user smokes; 2. Driving the LED switch: Based on the detected airflow signal, the microphone drives the electronic cigarette's LED light switch, simulating the open flame effect of a traditional cigarette; 3. Outputting voltage: The microphone also outputs a certain voltage to the atomizer, enabling the atomizer to atomize e-liquid and release vapor.

[0003] However, during the use of e-cigarette microphones, e-cigarette liquid can easily seep into the microphone. Once e-liquid and moisture enter the microphone's PCBA circuit board and electronic components, the overall performance of the e-cigarette will decrease. Furthermore, the long-term corrosion of the PCBA circuit board and electronic components by e-cigarette liquid can easily cause the microphone to malfunction and be damaged. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, one of the objectives of this invention is to provide a corrosion-resistant protective material for microphones.

[0005] The second objective of this invention is to provide a method for preparing an anti-corrosion protective material for microphones. This preparation method is simple to operate, easy to control, has high production efficiency, low production cost, and can be used for large-scale production.

[0006] One of the objectives of this invention is achieved through the following technical solution: a corrosion-resistant protective material for microphones, comprising the following raw materials in parts by weight:

[0007]

[0008]

[0009] The anti-corrosion protective material of this microphone is mainly composed of modified polyurethane resin, with the addition of nanofillers, coupling agents, wetting and dispersing agents, defoamers, film-forming aids and solvent A for synergistic effect. After the system is directly applied to the PCBA circuit board and electronic components of the microphone and cured, it can provide all-round hydrophobic, oleophobic, moisture-proof and corrosion-proof nano-coating protection, achieving better hydrophobic, oleophobic and corrosion-proof effects, and avoiding the microphone from being corroded by e-liquid, which would lead to a decrease in overall performance or even failure and damage. The modified polyurethane resin features specially modified CF bonds, and the electron cloud of fluorine atoms strongly shields the C-C bonds. This gives the fluorinated compound excellent low surface energy, water and oil repellency, lubricity, heat resistance, corrosion resistance, and anti-fouling properties, which enhances the stability and durability of the coating. Its synergistic effect with nanofillers improves the overall density of the coating, effectively preventing the penetration of liquids, gases, and microparticles. The coating provides comprehensive protection for the surface of the microphone's PCBA circuit board and electronic components. The added coupling agent and wetting and dispersing agent improve the affinity and dispersion uniformity of the nanofillers in the system, while also promoting the bonding between the system and the microphone's PCBA circuit board and electronic components, further enhancing the stability and durability of the coating. The added film-forming aids improve the wettability and leveling properties of the anti-corrosion protective material during drying and curing, making it easier to apply and form a uniform film, thus promoting film formation.

[0010] Preferably, the preparation method of each part of the modified polyurethane resin includes the following steps:

[0011] (R1) Take 20-30 parts by weight of perfluoropolyether diol, 10-15 parts of polyoxypropylene glycol, 60-80 parts of isocyanate, 1-2 parts of chain extender, 0.1-0.2 parts of organotin catalyst, 1-3 parts of neutralizer and 30-50 parts of solvent B, and set aside.

[0012] (R2) Take perfluoropolyether diol, polyoxypropylene diol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 150-200 r / min, heat to 80-110℃ and react for 1-2 h to obtain polyurethane prepolymer.

[0013] (R3) Add a chain extender to the polyurethane prepolymer, and react at 70-90℃ for 3-4 hours under nitrogen protection and stirring speed of 150-200 r / min. After standing for 1 hour, add a neutralizer and mix under stirring speed of 60-100 r / min. Then dehydrate under reduced pressure for 1-2 hours to obtain the modified polyurethane resin.

[0014] The modified polyurethane resin prepared by the above method has a special modified CF bond, and the electron cloud of the fluorine atom has a strong shielding effect on the C-C bond. This gives the fluorinated compound excellent low surface energy, water and oil repellency, lubricity, heat resistance, corrosion resistance, and anti-fouling properties, which is beneficial to enhancing the stability and durability of the coating. Furthermore, the perfluoropolyether diol and polyoxypropylene diol participate in the reaction as polyols, which further improves the system's corrosion resistance, hydrolysis resistance, and heat resistance. After reacting with the specific isocyanate of this invention, it helps to prevent yellowing of the coating, thus avoiding affecting the surface color of the PCBA circuit board and electronic components of the microphone. Step (R3) involves dehydration under reduced pressure for 1-2 hours to remove moisture from the modified polyurethane resin, ensuring that the water content of the modified polyurethane resin is below 0.05%, thus preventing moisture from damaging the PCBA circuit board and electronic components. Furthermore, the perfluoropolyether diol has an average molecular weight of 900-1100 and a density of 1.80-1.82 g / ml; the polyoxypropylene diol has an average molecular weight of 900-1100.

[0015] Preferably, the isocyanate is a mixture of hexamethylene diisocyanate and phenyl diisocyanate in a weight ratio of 3-5:1.

[0016] Using the above technical solution, the combined action of hexamethylene diisocyanate and phthalimethylene diisocyanate is more conducive to preventing yellowing of the coating and affecting the surface color of the microphone's PCBA circuit board and electronic components.

[0017] Preferably, the chain extender is at least one of 1,4-butanediol, ethanolamine, ethylene glycol, and neopentyl glycol, and the organotin catalyst is stannous octoate or dibutyltin dilaurate.

[0018] Preferably, the neutralizing agent is triethylamine; the solvent B is a mixture of N,N-dimethylformamide and acetone in a weight ratio of 2:1.

[0019] Preferably, the nanofiller is nano-silica.

[0020] Using the above technical solution, nano-silica is dispersed in the coating to form a dense three-dimensional network structure protective layer with superhydrophobic properties. This layer works synergistically with the modified polyurethane resin to improve the overall density and hydrophobic and oleophobic properties of the coating, further enhancing its anti-corrosion performance.

[0021] Preferably, the coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.01-0.02:1.

[0022] Preferably, the wetting and dispersing agent is Hydropalat 3204 and / or BYK-AT204; the defoamer is BYK141.

[0023] The above technical solution, with the combined action of coupling agent and wetting and dispersing agent, is beneficial to improving the affinity and dispersion uniformity of nanofillers in the system. At the same time, it promotes the bonding of the system with the PCBA circuit board and electronic components of the microphone, further enhancing the stability and durability of the coating. If only silane coupling agent KH560 or fluorinated coupling agent YS-1701 is used, the improvement effect is not obvious. Moreover, the use of fluorinated coupling agent YS-1701 alone is expensive due to its large dosage, which is not conducive to saving production costs.

[0024] Preferably, the film-forming aid is a mixture of trimethylsiloxysilicate and N-methylpyrrolidone in a weight ratio of 3:1-2; and the solvent A is at least one of xylene, butyl acetate and ethyl acetate.

[0025] Using the above technical solution, the film-forming aids, trimethylsiloxysilicate and N-methylpyrrolidone, work together to promote the firm adhesion of the anti-corrosion protective material to the surface of the microphone's PCBA circuit board and electronic components, forming a uniform, smooth and dense coating, thereby improving the coating's wear resistance, scratch resistance, and integrity and corrosion resistance.

[0026] The second objective of this invention is achieved through the following technical solution: the preparation method of the above-mentioned anti-corrosion protective material for microphones includes the following steps:

[0027] Take the modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, defoamer, film-forming aid and solvent A by weight, and set aside;

[0028] Modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, and defoamer are added sequentially to solvent A and mixed evenly. Then, film-forming aid is added and mixed evenly. Finally, the mixture is sealed to obtain the anti-corrosion protective material for the microphone.

[0029] When using, stir the anti-corrosion protective material for 1-3 minutes, then immerse the microphone's PCBA circuit board and electronic components in the anti-corrosion protective material for 5-8 seconds, and then dry it at 50℃ for 3-5 minutes to form a film, which can provide all-round hydrophobic, oleophobic, moisture-proof, and corrosion-proof nano-coating protection.

[0030] The beneficial effects of this invention are as follows: The anti-corrosion protective material of the microphone of this invention uses modified polyurethane resin as the main material, and adds nanofillers, coupling agents, wetting and dispersing agents, defoamers, film-forming aids and solvent A to work synergistically. After the system is directly applied to the PCBA circuit board and electronic components of the microphone and cured, it can provide all-round hydrophobic, oleophobic, moisture-proof and corrosion-proof nano-coating protection, obtain better hydrophobic, oleophobic and corrosion-proof effect, and avoid the microphone from being corroded by e-liquid, which would lead to a decrease in overall performance or even failure and damage.

[0031] The preparation method of the present invention is simple to operate, easy to control, has high production efficiency, low production cost, and can be used for large-scale production. Detailed Implementation

[0032] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0033] Example 1

[0034] A corrosion-resistant protective material for microphones, comprising the following raw materials in parts by weight:

[0035]

[0036] The preparation method of each portion of the modified polyurethane resin includes the following steps:

[0037] (R1) Take 25 parts by weight of perfluoropolyether diol, 12 parts of polyoxypropylene diol, 70 parts of isocyanate, 1.5 parts of chain extender, 0.15 parts of organotin catalyst, 2 parts of neutralizer and 40 parts of solvent B, and set aside.

[0038] (R2) Take perfluoropolyether diol, polyoxypropylene diol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 180 r / min, heat to 100℃ and react for 1.5 h to obtain polyurethane prepolymer.

[0039] (R3) Add a chain extender to the polyurethane prepolymer, and react at 80℃ for 3.5 hours under nitrogen protection and stirring speed of 180 r / min. After standing for 1 hour, add a neutralizer and mix under stirring speed of 80 r / min. Then dehydrate under reduced pressure for 1.5 hours to obtain the modified polyurethane resin.

[0040] The perfluoropolyether diol has an average molecular weight of 1000 and a density of 1.81 g / ml; the polyoxypropylene diol has an average molecular weight of 1000.

[0041] The isocyanate is a mixture of hexamethylene diisocyanate and phenyl diisocyanate in a weight ratio of 4:1.

[0042] The chain extender is 1,4-butanediol, and the organotin catalyst is dibutyltin dilaurate.

[0043] The neutralizing agent is triethylamine; the solvent B is a mixture of N,N-dimethylformamide and acetone in a weight ratio of 2:1.

[0044] The nanofiller is nano-silica with an average particle size of 50 nm.

[0045] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.015:1.

[0046] The wetting and dispersing agent is Hydropalat 3204; the defoamer is BYK141.

[0047] The film-forming aid is a mixture of trimethylsilyloxysilicate and N-methylpyrrolidone in a weight ratio of 3:1.5; the solvent A is a mixture of xylene and ethyl acetate in a weight ratio of 1:1.

[0048] The method for preparing the anti-corrosion protective material for the microphone includes the following steps:

[0049] Take the modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, defoamer, film-forming aid and solvent A by weight, and set aside;

[0050] Modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, and defoamer are added sequentially to solvent A and mixed evenly. Then, film-forming aid is added and mixed evenly. Finally, the mixture is sealed to obtain the anti-corrosion protective material for the microphone.

[0051] Example 2

[0052] A corrosion-resistant protective material for microphones, comprising the following raw materials in parts by weight:

[0053]

[0054]

[0055] The preparation method of each portion of the modified polyurethane resin includes the following steps:

[0056] (R1) Take 20 parts by weight of perfluoropolyether diol, 10 parts of polyoxypropylene diol, 60 parts of isocyanate, 1 part of chain extender, 0.1 part of organotin catalyst, 1 part of neutralizer and 30 parts of solvent B, and set aside.

[0057] (R2) Take perfluoropolyether diol, polyoxypropylene diol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 150 r / min, heat to 80℃ and react for 2 h to obtain polyurethane prepolymer.

[0058] (R3) Add a chain extender to the polyurethane prepolymer, and react at 70°C for 4 hours under nitrogen protection and stirring speed of 150 r / min. After standing for 1 hour, add a neutralizer and mix under stirring speed of 60 r / min. Then dehydrate under reduced pressure for 2 hours to obtain the modified polyurethane resin.

[0059] The perfluoropolyether diol has an average molecular weight of 1000 and a density of 1.81 g / ml; the polyoxypropylene diol has an average molecular weight of 1000.

[0060] The isocyanate is a mixture of hexamethylene diisocyanate and phenyl diisocyanate in a weight ratio of 3:1.

[0061] The chain extender is 1,4-butanediol, and the organotin catalyst is dibutyltin dilaurate.

[0062] The neutralizing agent is triethylamine; the solvent B is a mixture of N,N-dimethylformamide and acetone in a weight ratio of 2:1.

[0063] The nanofiller is nano-silica with an average particle size of 50 nm.

[0064] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.01:1.

[0065] The wetting and dispersing agent is Hydropalat 3204; the defoamer is BYK141.

[0066] The film-forming aid is a mixture of trimethylsilyloxysilicate and N-methylpyrrolidone in a weight ratio of 3:1; the solvent A is a mixture of xylene and ethyl acetate in a weight ratio of 1:1.

[0067] The method for preparing the anti-corrosion protective material for the microphone includes the following steps:

[0068] Take the modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, defoamer, film-forming aid and solvent A by weight, and set aside;

[0069] Modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, and defoamer are added sequentially to solvent A and mixed evenly. Then, film-forming aid is added and mixed evenly. Finally, the mixture is sealed to obtain the anti-corrosion protective material for the microphone.

[0070] Example 3

[0071] A corrosion-resistant protective material for microphones, comprising the following raw materials in parts by weight:

[0072]

[0073] The preparation method of each portion of the modified polyurethane resin includes the following steps:

[0074] (R1) Take 30 parts by weight of perfluoropolyether diol, 15 parts of polyoxypropylene diol, 80 parts of isocyanate, 2 parts of chain extender, 0.2 parts of organotin catalyst, 3 parts of neutralizer and 50 parts of solvent B, and set aside.

[0075] (R2) Take perfluoropolyether diol, polyoxypropylene diol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 200 r / min, heat to 110℃ and react for 1 h to obtain polyurethane prepolymer.

[0076] (R3) Add a chain extender to the polyurethane prepolymer, and react at 90℃ for 3 hours under nitrogen protection and stirring speed of 200 r / min. After standing for 1 hour, add a neutralizer and mix under stirring speed of 100 r / min. Then dehydrate under reduced pressure for 2 hours to obtain the modified polyurethane resin.

[0077] The perfluoropolyether diol has an average molecular weight of 1000 and a density of 1.81 g / ml; the polyoxypropylene diol has an average molecular weight of 1000.

[0078] The isocyanate is a mixture of hexamethylene diisocyanate and phenyl diisocyanate in a weight ratio of 5:1.

[0079] The chain extender is 1,4-butanediol, and the organotin catalyst is dibutyltin dilaurate.

[0080] The neutralizing agent is triethylamine; the solvent B is a mixture of N,N-dimethylformamide and acetone in a weight ratio of 2:1.

[0081] The nanofiller is nano-silica with an average particle size of 50 nm.

[0082] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.02:1.

[0083] The wetting and dispersing agent is Hydropalat 3204; the defoamer is BYK141.

[0084] The film-forming aid is a mixture of trimethylsilyloxysilicate and N-methylpyrrolidone in a weight ratio of 3:2; the solvent A is a mixture of xylene and ethyl acetate in a weight ratio of 1:1.

[0085] The method for preparing the anti-corrosion protective material for the microphone includes the following steps:

[0086] Take the modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, defoamer, film-forming aid and solvent A by weight, and set aside;

[0087] Modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, and defoamer are added sequentially to solvent A and mixed evenly. Then, film-forming aid is added and mixed evenly. Finally, the mixture is sealed to obtain the anti-corrosion protective material for the microphone.

[0088] Example 4

[0089] A corrosion-resistant protective material for microphones, comprising the following raw materials in parts by weight:

[0090]

[0091]

[0092] The preparation method of each portion of the modified polyurethane resin includes the following steps:

[0093] (R1) Take 27 parts by weight of perfluoropolyether diol, 12 parts of polyoxypropylene glycol, 70 parts of isocyanate, 1.2 parts of chain extender, 0.12 parts of organotin catalyst, 1.3 parts of neutralizer and 40 parts of solvent B, and set aside.

[0094] (R2) Take perfluoropolyether diol, polyoxypropylene diol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 180 r / min, heat to 90℃ and react for 1.2 h to obtain polyurethane prepolymer.

[0095] (R3) Add a chain extender to the polyurethane prepolymer, and react at 80℃ for 3.5 hours under nitrogen protection and stirring speed of 180 r / min. After standing for 1 hour, add a neutralizer and mix under stirring speed of 80 r / min. Then dehydrate under reduced pressure for 2 hours to obtain the modified polyurethane resin.

[0096] The perfluoropolyether diol has an average molecular weight of 1000 and a density of 1.81 g / ml; the polyoxypropylene diol has an average molecular weight of 1000.

[0097] The isocyanate is a mixture of hexamethylene diisocyanate and phenyl diisocyanate in a weight ratio of 4:1.

[0098] The chain extender is 1,4-butanediol, and the organotin catalyst is dibutyltin dilaurate.

[0099] The neutralizing agent is triethylamine; the solvent B is a mixture of N,N-dimethylformamide and acetone in a weight ratio of 2:1.

[0100] The nanofiller is nano-silica with an average particle size of 50 nm.

[0101] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.018:1.

[0102] The wetting and dispersing agent is Hydropalat 3204; the defoamer is BYK141.

[0103] The film-forming aid is a mixture of trimethylsilyloxysilicate and N-methylpyrrolidone in a weight ratio of 3:1.2; the solvent A is a mixture of xylene and ethyl acetate in a weight ratio of 1:1.

[0104] The method for preparing the anti-corrosion protective material for the microphone includes the following steps:

[0105] Take the modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, defoamer, film-forming aid and solvent A by weight, and set aside;

[0106] Modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, and defoamer are added sequentially to solvent A and mixed evenly. Then, film-forming aid is added and mixed evenly. Finally, the mixture is sealed to obtain the anti-corrosion protective material for the microphone.

[0107] Comparative Example 1

[0108] The difference between this comparative example and Example 1 is as follows:

[0109] The modified polyurethane resin was replaced with oil-based polyurethane resin MR-916.

[0110] Comparative Example 2

[0111] The difference between this comparative example and Example 1 is as follows:

[0112] The preparation method of each portion of the modified polyurethane resin includes the following steps:

[0113] (R1) Take 37 parts by weight of polyoxypropylene glycol, 70 parts by weight of isocyanate, 1.5 parts by weight of chain extender, 0.15 parts by weight of organotin catalyst, 2 parts by weight of neutralizer and 40 parts by weight of solvent B, and set aside.

[0114] (R2) Take polypropylene glycol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 180 r / min, heat to 100℃ and react for 1.5 h to obtain polyurethane prepolymer.

[0115] (R3) Add a chain extender to the polyurethane prepolymer, and react at 80℃ for 3.5 hours under nitrogen protection and stirring speed of 180 r / min. After standing for 1 hour, add a neutralizer and mix under stirring speed of 80 r / min. Then dehydrate under reduced pressure for 1.5 hours to obtain the modified polyurethane resin.

[0116] Comparative Example 3

[0117] The difference between this comparative example and Example 1 is as follows:

[0118] The isocyanate is isophorone diisocyanate.

[0119] Comparative Example 4

[0120] The difference between this comparative example and Example 1 is as follows:

[0121] The coupling agent is a mixture of silane coupling agent KH550 and silane coupling agent KH560 in a weight ratio of 0.015:1.

[0122] Performance testing

[0123] The anti-corrosion protective materials from Examples 1-4 and Comparative Examples 1-4 were used. The drying conditions for these materials were: drying at 50°C for 3-5 minutes to form a film. Their hydrophobicity, oleophobicity, acid and alkali corrosion resistance, and salt spray resistance were tested. The test methods were as follows:

[0124] Hydrophobicity test: The static contact angle of a water droplet on the surface of the anti-corrosion protective material coating was measured using an ASTM D 724 contact angle meter;

[0125] Oleophobicity test: The static contact angle of HALO Tribeca e-liquid droplets on the surface of the anti-corrosion protective material coating was measured using an ASTM D 724 contact angle meter;

[0126] Acid and alkali corrosion resistance test: The test was conducted according to the immersion method in GB / T 9274-1988 "Determination of resistance to liquid media of paints and varnishes". The test liquids were 10% sulfuric acid solution and 10% NaOH solution.

[0127] Salt spray resistance test: The test shall be conducted in accordance with the provisions of GB / T1771-1991 "Determination of resistance to neutral salt spray of paints and varnishes", and the test liquid shall be a 5% NaCl solution by mass concentration.

[0128] The test results are shown in Table 1 below:

[0129]

[0130]

[0131] As shown in Table 1 above, the anti-corrosion protection material of the microphone of the present invention can provide all-round hydrophobic, oleophobic, moisture-proof and corrosion-proof nano-coating protection, obtain better hydrophobic, oleophobic and corrosion-proof effect, and avoid the microphone from being corroded by e-liquid, which would lead to a decrease in overall performance or even failure and damage.

[0132] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A corrosion-resistant protective material for a microphone, characterized in that, The ingredients include the following parts by weight: 80-100 parts of modified polyurethane resin 15-25 parts of nanofiller 1-2 parts of coupling agent 1-2 parts wetting and dispersing agent 0.1-0.5 parts of defoamer 1-2 parts of film-forming aid Solvent A: 10-12 parts; The preparation method of each portion of the modified polyurethane resin includes the following steps: (R1) Take 20-30 parts by weight of perfluoropolyether diol, 10-15 parts of polyoxypropylene glycol, 60-80 parts of isocyanate, 1-2 parts of chain extender, 0.1-0.2 parts of organotin catalyst, 1-3 parts of neutralizer and 30-50 parts of solvent B, and set aside. (R2) Take perfluoropolyether diol, polyoxypropylene diol, isocyanate, organotin catalyst and solvent B and mix them evenly. Under nitrogen protection and stirring speed of 150-200 r / min, heat to 80-110℃ and react for 1-2 h to obtain polyurethane prepolymer. (R3) Add chain extender to polyurethane prepolymer, react for 3-4 hours under nitrogen protection and stirring speed of 150-200 r / min, control the temperature at 70-90℃, let stand for 1 hour, add neutralizer and mix under stirring speed of 60-100 r / min, then dehydrate under reduced pressure for 1-2 hours to obtain modified polyurethane resin. The isocyanate is a mixture of hexamethylene diisocyanate and phenyl diisocyanate in a weight ratio of 3-5:1; The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.01-0.02:

1.

2. The anti-corrosion protective material for a microphone according to claim 1, characterized in that: The chain extender is at least one of 1,4-butanediol, ethanolamine, ethylene glycol, and neopentyl glycol, and the organotin catalyst is stannous octoate or dibutyltin dilaurate.

3. The anti-corrosion protective material for a microphone according to claim 1, characterized in that: The neutralizing agent is triethylamine; the solvent B is a mixture of N,N-dimethylformamide and acetone in a weight ratio of 2:

1.

4. The anti-corrosion protective material for a microphone according to claim 1, characterized in that: The nanofiller is nano-silica.

5. The anti-corrosion protective material for a microphone according to claim 1, characterized in that: The wetting and dispersing agent is Hydropalat 3204 and / or BYK-AT204; the defoamer is BYK141.

6. The anti-corrosion protective material for a microphone according to claim 1, characterized in that: The film-forming aid is a mixture of trimethylsilyloxysilicate and N-methylpyrrolidone in a weight ratio of 3:1-2; the solvent A is at least one of xylene, butyl acetate and ethyl acetate.

7. A method for preparing an anti-corrosion protective material for a microphone as described in any one of claims 1-6, characterized in that, Includes the following steps: Take the modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, defoamer, film-forming aid and solvent A by weight, and set aside; Modified polyurethane resin, nanofiller, coupling agent, wetting and dispersing agent, and defoamer are added sequentially to solvent A and mixed evenly. Then, film-forming aid is added and mixed evenly. Finally, the mixture is sealed to obtain the anti-corrosion protective material for the microphone.

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