A microphone anti-fouling black matte coating, and a preparation method and application thereof

Abstract

The present application relates to a kind of microphone anti-fouling black matte paint and its preparation method and application, the matte paint includes the following weight parts of raw material component: silicone resin 40-50 parts, solvent 40-50 parts, dispersing agent 1-5 parts, carbon black 1-5 parts, amino resin 8-10 parts, wax powder 1-5 parts, leveling agent 0.1-0.5 parts, matting powder 5-10 parts.Compared with prior art, the matte black paint in the application is a single-component paint, it does not need to be mixed with curing agent according to weight ratio, has the advantages of simple and convenient construction spraying, the surface tension of the prepared matte black paint film is small, smooth, improves the dirt resistance, the hardness is also high, the scratch resistance is good, and the adhesion to substrate is good.

Description

Technical Field

[0001] This invention belongs to the field of functional coating technology, and relates to a black matte anti-fouling coating for microphones, its preparation method and application. Background Technology

[0002] Matte black paint, as a common type of coating, offers features such as stain resistance and device protection, and can be used for coating household appliances, machinery, and various facilities. Microphones, in particular, are widely used in many public speaking and hosting activities. However, with increasing emphasis on environmental protection and rising safety and environmental standards worldwide, coupled with growing demands for improved coating performance, paint-related organizations and their customers are particularly concerned about and eager to enhance the overall capabilities of coatings.

[0003] Most existing black matte coatings have problems such as poor stain resistance and lack of durability, which means that the products cannot effectively protect against stains for a long time after use, and customers cannot achieve satisfactory results.

[0004] For example, Chinese patent application CN116656234A provides a stain-resistant, high-temperature resistant semi-matte varnish, which uses organosilicon resin and amino resin as base resins, combined with appropriate additive ratios, to prepare a single-component stain-resistant, high-temperature resistant semi-matte varnish. This includes high-speed stirring and low-speed stirring steps, and uses polyether-modified polydimethylsiloxane leveling agent, surface-treated organic silica matting powder, and graded micronized polytetrafluoroethylene-modified polyethylene wax powder to form a high-hardness, smooth, and transparent paint film. However, the varnish provided by this patent still falls short of the performance requirements of microphone stain-resistant paint. Summary of the Invention

[0005] The purpose of this invention is to provide a microphone anti-fouling black matte coating, its preparation method and application. It does not require mixing with a curing agent in a weight ratio, and has the advantages of simple and convenient construction and spraying. The resulting matte black coating has low surface tension, is smooth, improves stain resistance, has high hardness, good scratch resistance, and good adhesion to the substrate.

[0006] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a microphone anti-fouling black matte coating, comprising the following raw material components in parts by weight: 40-50 parts of silicone resin 40-50 parts of solvent 1-5 parts of dispersant 1-5 parts carbon black 8-10 parts of amino resin, 1-5 parts wax powder Leveling agent 0.1-0.5 parts, 5-10 parts of matte powder.

[0007] Furthermore, the silicone resin is OT-8620 type silicone polyester modified resin.

[0008] Furthermore, the amino resin is a 303LF type amino resin.

[0009] Furthermore, the dispersant is a high molecular weight block copolymer solution containing pigment affinity groups, the carbon black is low pigment carbon black, the leveling agent is polyether-modified polydimethylsiloxane, the matting powder is silica with organic surface treatment, and the wax powder is graded micronized polytetrafluoroethylene modified polyethylene wax.

[0010] Furthermore, the dispersant is BYK161 type wetting and dispersing agent, the carbon black is PC6315F type carbon black, the leveling agent is BYK-333 type leveling agent, the matting powder is E-1011 type matting powder, and the wax powder is 1778 type wax powder.

[0011] Furthermore, the solvent is at least one of SOLVESSO 150, cyclohexanone, and a mixture of butyl acetate / n-butyl acetate.

[0012] In a second aspect, the present invention provides a method for preparing a black matte coating for microphone stain resistance, comprising the following steps: S1. Add organosilicon resin and part of the solvent to the dispersion vessel and stir evenly. Then add the dispersant and carbon black in sequence, stir evenly, and then perform grinding. S2. After filtering the grinding product in S1, add amino resin and wax powder, stir at high speed, then add leveling agent and remaining solvent, stir at low speed, and finally add matting powder, stir evenly, filter, and obtain the microphone anti-fouling black matte coating.

[0013] Furthermore, in S2, the high-speed stirring process is as follows: stirring at a speed of 1800-2000 rpm for 10-20 minutes.

[0014] Furthermore, in S2, the low-speed stirring process is: stirring at a speed of 200~300 rpm for 10~15 minutes.

[0015] In a third aspect, the present invention provides the application of a microphone anti-fouling black matte coating in the preparation of microphone coating varnish.

[0016] Compared with the prior art, the present invention has the following advantages: 1) The reasonable ratio of silicone resin and amino resin effectively improves the adhesion of amino resin and reduces its brittleness, allowing silicone resin to better exert its anti-fouling properties. The resulting black matte coating has a high film hardness and good anti-fouling effect. 2) Selecting suitable additives can better bring out the characteristics of silicone resin. The single-component feature also makes on-site spraying more convenient, saves paint mixing time, and makes it easier for on-site personnel to carry out construction more quickly and conveniently.

[0017] 3) The sample preparation method is simple, the selected carbon black is easy to disperse, and the resulting matte black coating film has low surface tension and is smooth, which improves its stain resistance, hardness, scratch resistance and adhesion to the substrate. Detailed Implementation

[0018] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0020] As used herein, the terms "and / or," "or / and," and "and / or" encompass any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected using at least two conjunctions selected from "and / or," "or / and," and "and / or," it should be understood that, in this application, the technical solution undoubtedly includes solutions connected by "logical AND," and also undoubtedly includes solutions connected by "logical OR."

[0021] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0022] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0023] This document only specifically discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0024] Unless otherwise specified, the temperature parameters in this application may be either constant temperature processing or processing within a certain temperature range. The constant temperature processing allows temperature fluctuations within the precision range controlled by the instrument, such as ±5°C, ±4°C, ±3°C, ±2°C, or ±1°C.

[0025] In this document, the term "suitable" as used in phrases such as "suitable combination," "suitable method," and "any suitable method" refers to the ability to implement the technical solution of this application, solve the technical problem of this application, and achieve the expected technical effect of this application.

[0026] In this application, terms such as "further," "even further," and "particularly" are used to describe purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0027] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it means that it is selected from either "with" or "without." If there are multiple "optional" entries in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, each "optional" entry shall be independent.

[0028] In the description of the application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] Unless otherwise specified, all preparations and tests described herein took place at 25°C.

[0030] The terms “comprising,” “including,” “containing,” “having,” “comprising,” or other variations thereof are intended to cover non-closed inclusion, and no distinction is made between these terms. The term “comprising” means that other steps and ingredients may be added without affecting the final result. The compositions and methods / processes of the present invention comprise, consist of, and substantially consist of the essential elements and limitations described herein, as well as any additional or optional ingredients, components, steps, or limitations described herein. No distinction is made between the terms “efficacy,” “performance,” “effect,” and “potency” herein.

[0031] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0032] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, but sequentially is preferred.

[0033] In the following embodiments, the silicone resin used is OT-8620 type silicone resin. This resin is produced by reacting an organosilicon prepolymer containing organic active groups and an organic resin using the latest technology. This resin possesses excellent gloss retention, color retention, water resistance, oil resistance, non-stick properties, excellent electrical insulation and temperature resistance (300℃-350℃), corrosion resistance, and weather resistance. It is widely used in cooking utensils, barbecue utensils, non-stick pans, high-temperature corrosion-resistant equipment in chemical environments, roll materials, and mid-to-high-end automotive paints and household appliances. Key technical indicators include a solid content of 60±2%, an acid value <7, and a colorless, transparent liquid appearance. This resin is soluble in organic solvents such as lipids, ketones, and acetates; it can be formulated into heat-resistant coatings that dry at approximately 250℃.

[0034] The amino resin is type 303LF. This resin is an environmentally friendly amino resin that meets Chinese environmental protection requirements. It can be used as a crosslinking agent for various polymer materials, suitable for oil-based industrial coatings, water-based coatings, tinplate coatings, coil coatings, electrophoretic paints, etc. Its characteristics include: excellent catalytic stability; excellent balance of hardness and flexibility. Its typical properties include: clear liquid appearance, non-volatile content >98%, color (Gardner <1), refractive index 1.515-1.520, formaldehyde content 0.1%, specific gravity 1.20 (25℃), etc.

[0035] The dispersant used is BYK161 type solvent-based system and high molecular weight wetting and dispersing agent for pigment concentrate, which is especially suitable for stabilizing ultrafine carbon black and organic pigments and significantly reducing the viscosity of grinding materials.

[0036] The carbon black used is PC6315F carbon black, which is a type of low-pigment carbon black and is easy to disperse and grind.

[0037] The leveling agent used is BYK-333, a silicone surface additive used in solvent-free, solvent-based, and water-based coating systems and printing inks. It significantly reduces surface tension, provides excellent substrate wetting, prevents keyholes, and increases surface smoothness.

[0038] The matting agent used is E-1011 type, an exceptionally fine particle size that meets the stringent requirements of thin-coat systems. It has a smooth feel, satisfying customers' increasingly demanding requirements for the surface finish of the paint film. It offers excellent transparency, allowing it to be used as a matting agent without compromising the base color of the coating. It exhibits good dispersibility, has undergone special surface treatment, and demonstrates high stability within the system, without producing hard sediment.

[0039] The wax powder used is type 1778 wax powder, which has good slip and scratch resistance in oil-based and powder coatings. This wax greatly reduces the coefficient of friction of the paint film surface and has good compatibility and is easy to disperse.

[0040] The solvent used was a mixture of SOLVESSO 150, cyclohexanone, and butyl acetate / n-butyl acetate (65wt% n-butyl acetate and 35wt% isobutyl acetate) in a mass ratio of 1:1.59:1.

[0041] Example 1: A black matte coating that meets the anti-fouling requirements of microphones, wherein the black matte coating is a single-component coating and does not need to be mixed with a curing agent in a weight ratio; The single-component black matte coating includes the following components and their weight percentages: 42.4 parts of organosilicon resin, 41.6 parts of solvent 1.9 parts dispersant 1.9 parts carbon black 8.8 parts of amino resin, 1.9 parts wax powder 0.3 parts leveling agent, 6.2 parts of matte powder.

[0042] The specific preparation method of this black matte coating includes: Add silicone resin and part of the solvent to the dispersion vessel and stir until homogeneous; then add dispersant and stir until homogeneous; then add carbon black and stir until homogeneous; then add glass beads or zirconium beads, and grind in a water bath or transfer to a SHAKE machine to grind to the required fineness; then filter out and add amino resin and stir until homogeneous; then add wax powder and stir at high speed for 18 minutes; then add leveling agent and stir at low speed for 12 minutes; then add the remaining solvent and stir until homogeneous; then add matting powder and stir at high speed for 25 minutes; filter through a 300-mesh filter to obtain a single-component black matte coating; The high-speed stirring speed is 1900 rpm, and the low-speed stirring speed is 250 rpm.

[0043] In this embodiment, the coating is applied to a microphone that has been uncoated, sanded, and wiped clean, and baked at 250°C for 40 minutes.

[0044] Example 2: A matte black coating that meets the anti-fouling requirements of microphones differs from Example 1 only in the following proportions: 42.4 parts silicone resin, 43.6 parts solvent, 2.5 parts dispersant, 3 parts carbon black, 10 parts amino resin, 0.3 parts leveling agent, 1 part wax powder, and 8 parts matting agent. The rest is the same as in Example 1.

[0045] Comparative Example 1: A black matte coating that meets the anti-fouling requirements of microphones differs from Example 1 only in that the matting powder is OK-607. Everything else is the same as in Example 1.

[0046] Comparative Example 2: A matte black coating that meets the anti-fouling requirements of microphones differs from Example 1 only in that the amino resin used is 5717. All other aspects are the same as in Example 1.

[0047] Comparative Example 3: A matte black coating that meets the anti-fouling requirements of microphones differs from Example 1 only in that the mass ratio of silicone resin to amino resin is 12:1. All other aspects are the same as in Example 1.

[0048] The results of the paint film performance test are shown in Table 1.

[0049] Table 1 Based on the data in the table above, it can be seen that in the conventional coating industry, the more matte powder added, the rougher the paint film surface becomes, and the coefficient of friction inevitably increases dramatically. However, this invention, by simultaneously increasing the amount of wax powder, achieves the ultimate matte finish required for microphone anti-glare while adding an extremely high amount of matte powder, and at the same time achieves an excellent smooth feel with a coefficient of friction of less than 0.4, achieving an effect of "extremely matte but not astringent". At the same time, carbon black particles, as physical impurities dispersed in the resin, will interrupt the cross-linking of polymer chains, usually leading to a decrease in hardness of 2-3 levels. This invention also compensates for the cross-linking density by increasing the amount of amino resin, locking the hardness of the black paint at 4H, while maintaining an adhesion level of 10 (no peeling after 100 cross-cut adhesion). Furthermore, this invention deliberately abandons the high-temperature-resistant OT-8650 silicone resin and selects OT-8620 silicone resin (temperature resistance 300-350℃) in combination with amino resin. By utilizing the unique active groups of OT-8620 and amino resin in a specific ratio to form a low-surface-energy flexible cross-linked network, the paint film cannot be wetted and penetrated when it comes into contact with human sebum and cosmetics (sunscreen). In this way, pollutants (esters in sunscreen, salts in sweat) cannot spread and adhere to the paint film surface, and can be removed by wiping gently without leaving permanent "handprint whitening" marks, thus achieving an anti-fouling effect.

[0050] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A black matte coating for microphones to resist dirt, characterized in that, The raw material components include the following parts by weight: 40-50 parts of silicone resin 40-50 parts of solvent 1-5 parts of dispersant 1-5 parts carbon black 8-10 parts of amino resin, 1-5 parts wax powder Leveling agent 0.1-0.5 parts, 5-10 parts of matte powder.

2. The microphone anti-fouling black matte coating according to claim 1, characterized in that, The silicone resin is OT-8620 type silicone polyester modified resin.

3. The microphone anti-fouling black matte coating according to claim 1, characterized in that, The amino resin is type 303LF amino resin.

4. The microphone anti-fouling black matte coating according to claim 1, characterized in that, The dispersant is a high molecular weight block copolymer solution containing pigment affinity groups, the carbon black is low pigment carbon black, the leveling agent is polyether-modified polydimethylsiloxane, the matting powder is silica with organic surface treatment, and the wax powder is graded micronized polytetrafluoroethylene modified polyethylene wax.

5. A microphone anti-fouling black matte coating according to claim 1 or 4, characterized in that, The dispersant is BYK161 type wetting and dispersing agent, the carbon black is PC6315F type carbon black, the leveling agent is BYK-333 type leveling agent, the matting powder is E-1011 type matting powder, and the wax powder is 1778 type wax powder.

6. The microphone anti-fouling black matte coating according to claim 1, characterized in that, The solvent is at least one of SOLVESSO 150, cyclohexanone, and a mixture of butyl acetate / n-butyl acetate.

7. The method for preparing a microphone anti-fouling black matte coating as described in claim 1, characterized in that, Includes the following steps: S1. Add organosilicon resin and part of the solvent to the dispersion vessel and stir evenly. Then add the dispersant and carbon black in sequence, stir evenly, and then perform grinding. S2. After filtering the grinding product in S1, add amino resin and wax powder, stir at high speed, then add leveling agent and remaining solvent, stir at low speed, and finally add matting powder, stir evenly, filter, and obtain the microphone anti-fouling black matte coating.

8. The method for preparing a microphone anti-fouling black matte coating according to claim 7, characterized in that, In S2, the high-speed stirring process is as follows: stir at a speed of 1800-2000 rpm for 10-20 minutes.

9. The method for preparing a microphone anti-fouling black matte coating according to claim 7, characterized in that, In S2, the low-speed stirring process is: stirring at a speed of 200~300 rpm for 10~15 minutes.

10. The application of the microphone anti-fouling black matte coating as described in claim 1 in the preparation of microphone coating varnish.

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