A sound-absorbing powder coating and preparation method thereof

Abstract

The present invention relates to the technical field of coatings, and in particular to a sound-absorbing powder coating and a preparation method thereof. The present invention uses epoxy resin and acrylic resin, and adopts isocyanate curing agent for curing, so as to give the coating excellent adhesion and impact resistance. Diatomaceous earth and sound-absorbing factors are used in the coating to provide the coating with a high-strength sound-absorbing effect. At the same time, pumice and sepiolite with high porosity are used as base materials in the sound-absorbing factor to increase the sound-absorbing effect and strength of the coating; the pumice and sepiolite are further subjected to heat treatment and organic treatment to increase the sound-absorbing effect of the sound-absorbing factor and also increase the adhesion effect and impact resistance of the coating system.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a sound-absorbing powder coating and a preparation method thereof. Background Art

[0002] Sound-absorbing coatings often use plant fibers, mineral fibers, etc. as the main raw materials combined with other fire retardants, moisture-proofing agents, enzyme-proofing agents, etc. They can be sprayed on interior roofs and walls using ordinary sprayers or spray pots to form a 2-10mm thick, apparently porous cotton-like coating material.

[0003] Existing sound-absorbing paints often add a large amount of plant fiber or diatom mud. When exposed to air and humid environments for a long time, the plant fiber and diatom mud are not compatible with the paint, which can easily cause the wall surface to peel off. The resulting coating has poor mechanical properties, causing damage to the surface of the sound-absorbing paint and affecting the sound absorption effect.

[0004] Therefore, there is an urgent need to provide a sound-absorbing coating that does not contain plant fiber and diatom mud to solve the technical problems of poor adhesion and insufficient sound absorption effect of existing sound-absorbing coatings. Summary of the invention

[0005] The present invention is based on solving the above technical problems, and thus provides the technical solution of the present invention. The sound-absorbing powder coating provided by the present invention has a highly efficient sound-absorbing effect, and also has excellent adhesion and mechanical strength.

[0006] Specifically, the present invention uses epoxy resin and acrylic resin, and adopts isocyanate curing agent for curing, so as to give the coating excellent adhesion and impact resistance. Diatomaceous earth and sound absorption factor are used in the coating to provide the coating with high-strength sound absorption effect. At the same time, pumice and sepiolite with high porosity are used as base materials in the sound absorption factor to increase the sound absorption effect and strength of the coating; the pumice and sepiolite are further subjected to heat treatment and organic treatment to increase the sound absorption effect of the sound absorption factor and also increase the adhesion effect and impact resistance of the coating system.

[0007] On the one hand, the present invention provides a sound-absorbing powder coating, which contains, by mass, 25-40 parts of epoxy resin, 20-35 parts of acrylic resin, 5-15 parts of isocyanate, 7-12 parts of sound-absorbing factor, 2-5 parts of diatom mud, 1-5 parts of leveling agent, 1-4 parts of dispersant, 6-25 parts of filler, and 1-3 parts of defoaming agent.

[0008] Furthermore, the amount of the epoxy resin in the coating in parts by mass can also be selected to be 28, 30, 32, 34, 36, 38, 39 or a range between any two of the above values.

[0009] Furthermore, the mass percentage of the acrylic resin in the coating can also be selected to be 22, 24, 25, 28, 30, 32, 34 or a range between any two of the above values.

[0010] Furthermore, the mass fraction of the isocyanate in the coating can also be selected as 6, 7, 8, 9, 10, 11, 12, 13, 14 or a fraction between any two of the above values. The isocyanate includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate.

[0011] Furthermore, the mass percentage of the sound absorption factor in the coating can also be selected as 8, 9, 9.5, 10, 10.5, 11, 11.5 or a range between any two of the above values.

[0012] Furthermore, the sound absorbing factor comprises a mixture obtained by sequentially subjecting sepiolite and pumice to heat treatment and organic treatment.

[0013] The heat treatment includes treating at a temperature of 1380-1480°C.

[0014] Further, the heat treatment comprises the following steps: step 1, crushing sepiolite and pumice respectively, selecting sepiolite and pumice particles with a particle size of 10-120 microns for standby use; step 2, mixing the selected sepiolite particles and pumice particles in a mass ratio of 1: (1.5-2.3) and treating at a temperature of 1380-1480° C. for 1-10 hours;

[0015] Step 3: taking out and cooling to obtain a heat-treated mixture.

[0016] Furthermore, the particle size of the sepiolite and pumice particles in step 1 may also be in the range of 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 microns or any other range between any two of the above values.

[0017] Furthermore, in the step 2, the mass ratio of the sepiolite particles to the pumice particles is 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.1 or a range between any two of the above values.

[0018] Furthermore, the treatment at a temperature of 1380-1480° C. in step 2 may be performed by placing the powder in an environment of 1380-1480° C. for heat preservation.

[0019] Furthermore, the temperature in step 2 is any value of 1390°C, 1400°C, 1410°C, 1420°C, 1430°C, 1440°C, 1450°C, 1460°C, 1470°C, or a temperature range between any two of the above values.

[0020] Furthermore, the processing time in step 2 may be any value among 2, 3, 4, 5, 6, 7, 8, 9 hours or a time range between any two of the above values.

[0021] Furthermore, in step three, the mixture is cooled to room temperature.

[0022] Furthermore, the heat treatment comprises the following steps:

[0023] Step 1, crushing the sepiolite and pumice respectively, selecting the particle size of the sepiolite and pumice particles to be 10-120 microns, and setting aside;

[0024] Step 2: Evenly mix the sepiolite particles and pumice particles selected for particle size according to a mass ratio of 1:(1.5-2.3), and place them in an environment of 1380-1480°C for 1-10 hours;

[0025] Step 3: taking out and cooling to room temperature to obtain a heat-treated mixture.

[0026] Furthermore, the organic treatment includes using a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane for treatment.

[0027] Furthermore, the organic treatment includes a step of treating the heat-treated mixture with a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane.

[0028] Furthermore, the organic treatment step includes: step A, stirring the above-mentioned heat-treated mixture with an ethanol aqueous solution; step B, adding a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane and stirring evenly; step C, filtering and drying the filter residue to obtain the sound absorption factor.

[0029] Furthermore, the mass ratio of the heat-treated mixture in step A to the ethanol aqueous solution is 1:(5-100), or 1:10, 1:15, 1:20, 1:25, 1:30, 1:40, 1:50, 1:60, 1:70, 1:80, 1:90, or a range between any two of the above ratios.

[0030] Furthermore, the mass percentage concentration of ethanol in the ethanol aqueous solution in step A is 25%-55%, or 30%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50% or the range between any two of the above percentages.

[0031] Furthermore, the stirring speed in steps A and B can be 100-4500 rpm, or 200, 300, 400, 500, 800, 1000, 2000, 3000, 4000 rpm or a range between any two of the above speeds.

[0032] Furthermore, the stirring time in steps A and B can be selected to be 0.5-10 hours, or 1, 2, 3, 4, 5, 6, 7, 8, 9 hours or a range between any two of the above times.

[0033] Furthermore, the stirring temperature in steps A and B can be selected to be 20-65°C, or 25, 28, 30, 35, 40, 45, 50, 55, 60°C or a range between any two of the above temperatures.

[0034] Furthermore, the amount of the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane added in step B is (1-10) times, or 2, 3, 4, 5, 6, 7, 8, 9 times, or any range between two times of the mass of the heat-treated mixture.

[0035] Furthermore, in the step B, the mass ratio of isopropyl distearate acyloxyaluminate to vinyl-tri(2-methoxyethoxy)silane is (1.2-2.2):1, or 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.1:1, or a range between any two of the above ratios.

[0036] Furthermore, the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in step B is a mixture of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane and ethanol aqueous solution. The mass percentage concentration of ethanol in the ethanol aqueous solution is 25%-55%, or 30%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50% or a range between any two of the above percentages. And the mass ratio of the total mass of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to the ethanol solution is 1:(4-20),

[0037] value or the range between any two of the above ratios.

[0038] Furthermore, the drying in step C is performed at a temperature of 90-115° C., and further, the drying temperature is selected to be 95, 100, 102, 105, 108, 110, 114° C. or a range between any two of the above temperatures.

[0039] Furthermore, the drying in step C is to a moisture content of less than 10%, less than 95%, less than 8%, less than 7%, less than 6% or less than 5%.

[0040] Furthermore, the step of organic treatment includes:

[0041] Step A: stirring the heat-treated mixture and an ethanol aqueous solution having a mass percentage concentration of 25%-55% at a mass ratio of 1:(5-100) at a temperature of 20-65° C. and a stirring speed of 100-4500 rpm for 0.5-10 hours until the mixture is uniformly stirred;

[0042] Step B: adding a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in a mass multiple of (1-10) times that of the heat-treated mixture, stirring for 0.5-10 hours at a temperature of 20-65° C. and a stirring speed of 100-4500 rpm, and stirring evenly; wherein the mass ratio of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is (1.2-2.2):1, the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is a mixture of isopropyl distearate acyloxyaluminate, vinyl-tri(2-methoxyethoxy)silane and an ethanol aqueous solution with a mass percentage concentration of 25%-55%, and the mass ratio of the total mass of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to the ethanol aqueous solution is 1:(4-20);

[0043] Step C: filtering and drying the filter residue at a temperature of 90-115° C. until the water content is less than 10%, thereby obtaining the sound absorption factor.

[0044] Furthermore, the preparation method of the sound absorption factor comprises:

[0045] (I) The steps of heat treatment are as follows:

[0046] Step 1: crush the sepiolite and pumice respectively, select the particle size of the sepiolite and pumice particles to be 10-120 microns, and set aside;

[0047] Step 2: Mix the sepiolite particles and pumice particles selected for particle size at a mass ratio of 1:(1.5-2.3) and then place them in an environment of 1380-1480°C for 1-10 hours;

[0048] Step 3: Take out and cool to room temperature to obtain a heat-treated mixture.

[0049] (II) The steps of organic treatment are as follows:

[0050] Step A: The heat-treated mixture and an ethanol aqueous solution having a mass percentage concentration of 25%-55% are mixed in a mass ratio of 1:(5-100), at a temperature of 20-65° C. and a stirring speed of 100-4500 rpm, for 0.5-10 hours, and stirred evenly;

[0051] Step B: adding a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in a mass multiple of (1-10) times that of the heat-treated mixture, stirring for 0.5-10 hours at a temperature of 20-65° C. and a stirring speed of 100-4500 rpm, and stirring evenly; wherein the mass ratio of isopropyl distearate acyloxyaluminate to vinyl-tri(2-methoxyethoxy)silane is (1.2-2.2):1, the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is a mixture of isopropyl distearate acyloxyaluminate, vinyl-tri(2-methoxyethoxy)silane and an ethanol aqueous solution with a mass percentage concentration of 25%-55%, and the mass ratio of the total mass of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to the ethanol aqueous solution is 1:(4-20);

[0052] Step C: filtering and drying the filter residue at a temperature of 90-115° C. until the water content is less than 10%, thereby obtaining the sound absorption factor.

[0053] Furthermore, the mass dosage of the diatom mud in the coating can also be selected as 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.5 or a range between any two of the above values.

[0054] Furthermore, the amount of the leveling agent in the coating can be selected as 1.2, 1.5, 2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.5 or the range between any two of the above values. The leveling agent includes at least one of EFKA LF-3600, EFKA LF-3777, BYK-302, BYK-333 and BYK-345.

[0055] Furthermore, the mass fraction of the dispersant in the coating can be selected as 1.2, 1.5, 2, 2.5, 2.8, 3, 3.2, 3.5, 3.8 or the range between any two of the above values. The dispersant includes at least one of alkyl sulfate, alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether.

[0056] Furthermore, the mass fraction of the filler in the coating can be selected as 7, 9, 11, 13, 15, 17, 19, 20, 21, 23, 24 or a range between any two of the above values. The filler includes at least one of calcium sulfate, calcium carbonate, titanium dioxide and silicon dioxide.

[0057] Furthermore, the mass fraction of the defoamer in the coating can be selected as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8 or a fraction between any two of the above values. The defoamer includes at least one of polybutyl acetate and polydimethylsiloxane.

[0058] On the other hand, the present invention also provides a method for preparing the sound-absorbing powder coating, comprising the following steps:

[0059] Step 1, weigh each raw material;

[0060] Step 2, mixing raw materials in a reaction vessel;

[0061] Step 3: delivering the product to an extruder for melt extrusion, followed by tableting, crushing, and screening to obtain the sound-absorbing powder coating.

[0062] Furthermore, the melting temperature of step 3 is 85-105°C, or 88, 90, 92, 95, 98, 100, 102, 104°C or a range between any two of the above temperatures.

[0063] Furthermore, the screw speed frequency of the extruder in step 3 is 10-120 Hz, or 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 Hz or a range between any two of the above frequencies.

[0064] Furthermore, the particle size of the screening in step 3 is 100-500 mesh, or a mesh size between any two values ​​selected from 100, 200, 300, 400, and 500.

[0065] On the other hand, the present invention further provides a coating, wherein the coating is prepared using the sound-absorbing coating of the present invention.

[0066] On the other hand, the present invention further provides an object, the surface of which includes a coating prepared using the sound-absorbing coating of the present invention.

[0067] Beneficial Effects

[0068] The present invention uses epoxy resin and acrylic resin, and adopts isocyanate curing agent for curing, so as to give the coating excellent adhesion and impact resistance. Diatomaceous earth and sound absorption factor are used in the coating to provide the coating with high-strength sound absorption effect. At the same time, pumice and sepiolite with high porosity are used as base materials in the sound absorption factor to increase the sound absorption effect and strength of the coating; the pumice and sepiolite are further subjected to heat treatment and organic treatment to increase the sound absorption effect of the sound absorption factor and also increase the adhesion effect and impact resistance of the coating system.

[0069] The present invention uses diatomaceous earth and sound-absorbing factors in the coating to provide the coating with a high-strength sound-absorbing effect. In particular, pumice and sepiolite with high porosity are used as base materials in the sound-absorbing factors and are improved and processed, so that the coating of the present invention has an excellent sound-absorbing effect. The coating of the present invention can block a volume of 46.21 decibels, and the proportion of noise reduction effect reaches 67.24%, has a highly efficient noise reduction effect, and has a broad application prospect.

[0070] The heat treatment temperature of 1380-1480° C. in the present invention can promote the sound absorption factor and improve the noise absorption effect, thereby giving the sound-absorbing coating a high-efficiency noise reduction effect.

[0071] The present invention uses a combination of pumice and sepiolite as the base material of the sound-absorbing factor. The two promote and coordinate each other, and can significantly promote the noise absorption effect of the sound-absorbing coating. When the mass ratio of the two is 1: (1.5-2.3), the sound absorption effect of the obtained coating is more excellent.

[0072] The organic treatment of sepiolite and pumice in the present invention can significantly enhance the effect of the sound absorption factor. The isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane used can produce a synergistic increase effect, enhance the compatibility of the sound absorption factor with the system and the performance of the sound absorption performance, thereby synergistically enhancing the sound absorption factor to promote the noise reduction effect of the coating. Moreover, when the ratio of the two reaches (1.2-2.2):1, the sound absorption effect of the obtained coating is better.

[0073] The coating obtained by the sound-absorbing coating prepared by the present invention has excellent adhesion and impact resistance, the adhesion grade is as high as level 0, and the impact resistance index reaches 61.47kg / cm. The coating obtained by the coating of the present invention has excellent mechanical properties and good use effect.

[0074] The sound absorption factor obtained by treating with isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in the present invention can not only promote the sound absorption effect, but also at least increase the adhesion and impact resistance of the coating. The combination of the two has a mutually promoting effect in increasing the mechanical properties of the coating, and the two have a positive promoting effect in positively increasing the mechanical properties of the coating.

[0075] When the invention uses isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to improve the impact resistance and adhesion performance of the coating, when the mass ratio of the two is in the range of 1.2-2.2):1, the impact resistance and adhesion effect of the obtained product are optimal.

[0076] The combination of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane used in the system of the present invention is more suitable for the system of the present invention than the sound absorption factors obtained by other organic treatments, and can further promote the impact resistance and adhesion performance of the coating. DETAILED DESCRIPTION

[0077] The present invention will be described below in conjunction with specific embodiments, and the effects of the present invention will be more clearly presented.

[0078] 1. Sound absorption factor and coating preparation

[0079] 1. Preparation of sound absorption factor 1:

[0080] (I) The steps of heat treatment are as follows:

[0081] Step 1: crush the sepiolite and pumice respectively, select the particle size of the sepiolite and pumice particles to be 10-80 microns, and set aside;

[0082] Step 2: Mix the sepiolite particles and pumice particles selected for the particle size in a mass ratio of 1:2, and then place them in an environment of 1480°C for 6.2 hours;

[0083] Step 3: Take out and cool to room temperature to obtain a heat-treated mixture.

[0084] (II) The steps of organic treatment are as follows:

[0085] Step A: The heat-treated mixture and a 50% ethanol aqueous solution are mixed in a mass ratio of 1:20 at a temperature of 50° C. and a stirring speed of 300 rpm for 1 hour to stir evenly;

[0086] Step B: adding a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in a mass multiple of 5 times that of the heat-treated mixture, stirring for 4 hours at a temperature of 45° C. and a stirring speed of 500 rpm, and stirring evenly; wherein the mass ratio of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is 1.8:1, the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is a mixture of isopropyl distearate acyloxyaluminate, vinyl-tri(2-methoxyethoxy)silane and an ethanol aqueous solution with a mass percentage concentration of 50%, and the mass ratio of the total mass of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to the ethanol aqueous solution is 1:8;

[0087] Step C: filtering and drying the filter residue at 105° C. to a water content of 4.3%, thereby obtaining the sound absorption factor 1.

[0088] 2. Preparation of sound absorption factor 2:

[0089] (I) The steps of heat treatment are as follows:

[0090] Step 1: crush the sepiolite and pumice respectively, select the particle size of the sepiolite and pumice particles to be 10-80 microns, and set aside;

[0091] Step 2: Mix the sepiolite particles and pumice particles selected for the particle size in a mass ratio of 1:1.5, and then place them in an environment of 1380°C for 8 hours;

[0092] Step 3: Take out and cool to room temperature to obtain a heat-treated mixture.

[0093] (II) The steps of organic treatment are as follows:

[0094] Step A: The heat-treated mixture and a 50% ethanol aqueous solution are mixed in a mass ratio of 1:18, at a temperature of 45° C. and a stirring speed of 400 rpm, and stirred for 0.8 hours until the mixture is uniformly stirred;

[0095] Step B: adding a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in a mass multiple of 5 times that of the heat-treated mixture, stirring for 4.5 hours at a temperature of 55° C. and a stirring speed of 500 rpm, and stirring evenly; wherein the mass ratio of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is 1.2:1, the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is a mixture of isopropyl distearate acyloxyaluminate, vinyl-tri(2-methoxyethoxy)silane and an ethanol aqueous solution with a mass percentage concentration of 35%, and the mass ratio of the total mass of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to the ethanol aqueous solution is 1:7;

[0096] Step C: filtering and drying the filter residue at 100° C. to a water content of 5.6%, thereby obtaining the sound absorption factor 2.

[0097] 3. Preparation of sound absorption factor 3: The difference from the preparation of sound absorption factor 1 is: Step 2: Mix the sepiolite particles and pumice particles selected by particle size in a mass ratio of 1:2, and then keep them in an environment of 1650°C for 6.2 hours; the rest are the same as sound absorption factor 1.

[0098] 4. Preparation of sound absorption factor 4: The difference from the preparation of sound absorption factor 1 is: Step 2: Mix the sepiolite particles and pumice particles selected by particle size in a mass ratio of 1:2, and then keep them warm at 1220℃ for 6.2 hours; the rest are the same as sound absorption factor 1.

[0099] 5. Preparation of sound absorption factor 5: The difference from the preparation of sound absorption factor 1 is that only sepiolite is used instead of pumice; the rest is the same as that of sound absorption factor 1.

[0100] 6. Preparation of sound absorption factor 6: The difference from the preparation of sound absorption factor 1 is that only pumice is used, and sepiolite is not used; the rest is the same as that of sound absorption factor 1.

[0101] 7. Preparation of sound absorption factor 7: The difference from the preparation of sound absorption factor 1 is that the mass ratio of sepiolite particles to pumice particles is 1:1; the rest is the same as that of sound absorption factor 1.

[0102] 8. Preparation of sound absorption factor 8: The difference from the preparation of sound absorption factor 1 is that the mass ratio of sepiolite particles to pumice particles is 1:3; the rest are the same as that of sound absorption factor 1.

[0103] 9. Preparation of sound absorption factor 9: The difference from the preparation of sound absorption factor 1 is that isopropyl distearate acyloxyaluminate is not used, and isopropyl distearate acyloxyaluminate in the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is replaced by an equal amount of vinyl-tri(2-methoxyethoxy)silane; the rest are the same as those of sound absorption factor 1.

[0104] 10. Preparation of sound absorption factor 10: The difference from the preparation of sound absorption factor 1 is that vinyl tris(2-methoxyethoxy)silane is not used, and the vinyl tris(2-methoxyethoxy)silane in the solution of isopropyl distearate acyloxyaluminate and vinyl tris(2-methoxyethoxy)silane is replaced by an equal amount of isopropyl distearate acyloxyaluminate; the rest are the same as those of sound absorption factor 1.

[0105] 11. Preparation of sound absorption factor 11: The difference from the preparation of sound absorption factor 1 is that the mass ratio of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is 0.5:1; the rest are the same as those of sound absorption factor 1.

[0106] 12. Preparation of sound absorption factor 12: The difference from the preparation of sound absorption factor 1 is that the mass ratio of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is 3:1; the rest are the same as those of sound absorption factor 1.

[0107] 13. Preparation of sound absorption factor 13: The difference from the preparation of sound absorption factor 1 is that an equal amount of silane coupling agent KH550 is used to replace isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane; the rest is the same as that of sound absorption factor 1.

[0108] 14. Preparation of sound absorbing factor 14: The difference from the preparation of sound absorbing factor 1 is that the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is replaced with an equal amount of water; the rest is the same as that of sound absorbing factor 1.

[0109] B. Preparation of sound-absorbing coating

[0110] Raw materials for preparing the coating, in parts by mass: 35 parts of epoxy resin, 30 parts of acrylic resin, 4 parts of isocyanate diphenylmethane diisocyanate, 6 parts of isocyanate dicyclohexylmethane diisocyanate, 9.5 parts of sound absorption factor, 3.2 parts of diatom mud, 1.5 parts of leveling agent BYK-302, 2 parts of dispersant sodium dodecyl sulfate, 4 parts of filler calcium carbonate, 6 parts of filler titanium dioxide, and 1.3 parts of defoaming agent polydimethylsiloxane.

[0111] The coating preparation method comprises the following steps: step 1, weighing the raw materials; step 2, mixing the raw materials in a reaction container; step 3, delivering the raw materials to an extruder with a screw speed frequency of 45 Hz for melt extrusion at a temperature of 95° C., and then subjecting the raw materials to tableting, crushing, and screening to select particles with a mesh size of 150-400 to obtain the sound-absorbing powder coating.

[0112] Note: Sources of raw materials: Epoxy resin: bisphenol A epoxy resin E-20, Jining Tangyi Chemical Co., Ltd. Acrylic resin: Japan Mitsubishi acrylic resin BR-113. Diatom mud: Shandong Tengwang Chemical Co., Ltd., select a particle size less than 10 microns. Leveling agent BYK-302: German BYK Chemical Company. Sodium dodecyl sulfate: Xi'an Tianzheng Pharmaceutical Excipients Co., Ltd., select a particle size less than 10 microns. Calcium carbonate: Shenzhen Green City Environmental Protection Technology Co., Ltd., select a particle size less than 10 microns. Titanium dioxide: Langfang Chuangge Chemical Products Co., Ltd., select a particle size less than 10 microns. Polydimethylsiloxane: Jinan Hongtai Chemical Co., Ltd.

[0113] The coatings with different sound absorption factors 1-14 prepared according to the above raw materials, dosages and preparation processes are named sound absorption coating compositions 1-14 respectively.

[0114] 2. Effect Test

[0115] I. Sound absorption effect test

[0116] The sound-absorbing coatings 1-14 were sprayed on the surface of the simulated building for multiple times to form a sound-absorbing coating, and the thickness of the coating was about 5 mm; then the sound-absorbing effect was tested; wherein each simulated building was in the same simulated noise environment. First, the sound decibel number A0 of the outer surface of each simulated building was tested using an instrument, and then the sound decibel number A1 inside the simulated building sprayed with the sound-absorbing coatings 1-14 was tested, and the sound insulation decibel number K=A0-A1 and the sound insulation efficiency t=100%*K / A0 were calculated. The results are shown in Table 1.

[0117] Table 1: Sound absorption effect test

[0118] Test / Group A0 / dB A1 / dB K / dB t Paint 1 68.72 22.51 46.21 67.24％ Paint 2 68.65 23.09 45.56 66.37％ Paint 3 68.79 24.64 44.15 64.18％ Coating 4 68.13 25.47 42.66 62.62％ Paint 5 68.57 25.55 43.02 62.74％ Coating 6 68.02 26.24 41.78 61.42％ Paint 7 68.41 24.66 43.75 63.95％ Paint 8 68.23 24.21 44.02 64.52％ Paint 9 68.36 26.78 41.58 60.83％ Paint 10 68.50 26.03 42.47 62.00％ Paint 11 68.84 24.78 44.06 64.00％ Paint 12 68.61 23.88 44.73 65.19％ Paint 13 68.28 28.42 39.86 58.38％ Paint 14 68.93 35.97 32.96 47.82％

[0119] It can be seen from the test results in Table 1 that the present invention uses diatomaceous earth and sound absorption factors in the coating to provide the coating with a high-intensity sound absorption effect. In particular, pumice and sepiolite with high porosity are used as base materials in the sound absorption factor and are improved, so that the coating of the present invention has excellent sound absorption effect. The coating of the present invention can block a volume of 46.21 decibels, and the proportion of noise reduction effect reaches 67.24%, which has a high-efficiency noise reduction effect and a broad application prospect.

[0120] From the test results of coatings 1, 3, and 4, it can be seen that the heat treatment temperature of 1380-1480° C. in the present invention can promote the sound absorption factor and improve the noise absorption effect, giving the sound-absorbing coating a high-efficiency noise reduction effect.

[0121] From the comparison results of coatings 1, 5-8, it can be seen that the present invention uses pumice and sepiolite as the base material of the sound-absorbing factor, and the two promote and coordinate each other, which can significantly promote the noise absorption effect of the sound-absorbing coating. When the mass ratio of the two is 1: (1.5-2.3), the sound absorption effect of the obtained coating is more excellent.

[0122] The organic treatment of sepiolite and pumice in the present invention can significantly enhance the effect of the sound absorption factor. The isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane used can produce a synergistic increase effect, enhance the compatibility of the sound absorption factor with the system and the performance of the sound absorption performance, thereby synergistically enhancing the sound absorption factor to promote the noise reduction effect of the coating. Moreover, when the ratio of the two reaches (1.2-2.2):1, the sound absorption effect of the obtained coating is better.

[0123] II. Adhesion and impact strength test

[0124] The above-mentioned sound-absorbing coating compositions 1 and 9-14 were sprayed on an aluminum sheet and cured at 200° C. for 2 hours. The thickness of the cured coating was about 120 μm. The coatings obtained by coatings 1 and 9-14 were named coatings 1 and 9-14, respectively. Adhesion and impact strength tests were performed on coatings 1 and 9-14.

[0125] The coating adhesion test method and standard are shown in GB / T 9286-88 "Standard for Determination of Coating Adhesion Method". Three groups are tested in parallel and the average value is taken.

[0126] The test method and standard for coating impact resistance are shown in GB / T1732-1993. Three groups are tested in parallel and the average value is taken.

[0127]

[0128] It can be seen from the test results in Table 2 that the coating obtained by the sound-absorbing coating prepared by the present invention has excellent adhesion and impact resistance, the adhesion grade is as high as level 0, and the impact resistance index reaches 61.47 kg / cm. The coating obtained by the coating of the present invention has excellent mechanical properties and good use effect.

[0129] From the coating effect test obtained by coatings 1, 9-10, it can be seen that the sound absorption factor obtained by treating with isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in the present invention can not only promote the sound absorption effect, but also at least increase the adhesion and impact resistance of the coating. The combination of the two has a mutually reinforcing effect in increasing the mechanical properties of the coating, and the two have a positive promoting effect in positively increasing the mechanical properties of the coating.

[0130] From the comparison of coatings 1, 9-12, it can be seen that when the present invention uses isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to improve the impact resistance and adhesion performance of the coating, when the mass ratio of the two is in the range of 1.2-2.2):1, the impact resistance and adhesion effect of the obtained product are the best.

[0131] The combination of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane used in the system of the present invention is more suitable for the system of the present invention than the sound absorption factors obtained by other organic treatments, and can further promote the impact resistance and adhesion performance of the coating.

[0132] Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A sound-absorbing powder coating, characterized in that: In terms of mass parts, it contains: 25-40 parts of epoxy resin, 20-35 parts of acrylic resin, 5-15 parts of isocyanate, 7-12 parts of sound absorption factor, 2-5 parts of diatom mud, 1-5 parts of leveling agent, 1-4 parts of dispersant, 6-25 parts of filler, and 1-3 parts of defoaming agent; The preparation method of the sound absorption factor comprises: (I) The steps of heat treatment are as follows: Step 1: crush the sepiolite and pumice respectively, select the particle size of the sepiolite and pumice particles to be 10-120 microns, and set aside; Step 2: Mix the sepiolite particles and pumice particles in a mass ratio of 1:(1.5-2.3) and then place them in an environment of 1380-1480°C for 1-10 hours; Step three: remove and cool to room temperature to obtain a heat-treated mixture; (II) The steps of organic treatment are as follows: Step A: The heat-treated mixture and an ethanol aqueous solution having a mass percentage concentration of 25%-55% are mixed in a mass ratio of 1:(5-100), at a temperature of 20-65° C. and a stirring speed of 100-4500 rpm, for 0.5-10 hours, and stirred evenly; Step B: adding a solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane in a mass multiple of (1-10) times that of the heat-treated mixture, stirring for 0.5-10 hours at a temperature of 20-65° C. and a stirring speed of 100-4500 rpm, and stirring evenly; wherein the mass ratio of isopropyl distearate acyloxyaluminate to vinyl-tri(2-methoxyethoxy)silane is (1.2-2.2):1, the solution of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane is a mixture of isopropyl distearate acyloxyaluminate, vinyl-tri(2-methoxyethoxy)silane and an ethanol aqueous solution with a mass percentage concentration of 25%-55%, and the mass ratio of the total mass of isopropyl distearate acyloxyaluminate and vinyl-tri(2-methoxyethoxy)silane to the ethanol aqueous solution is 1:(4-20); Step C: filtering and drying the filter residue at a temperature of 90-115° C. until the water content is less than 10%, thereby obtaining the sound absorption factor; The leveling agent includes at least one of EFKA LF-3600, EFKA LF-3777, BYK-302, BYK-333, and BYK-345; The dispersant includes at least one of alkyl sulfate, alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether, and alkylphenol polyoxyethylene ether; The filler includes at least one of calcium sulfate, calcium carbonate, titanium dioxide and silicon dioxide; The defoaming agent includes at least one of polybutyl acetate and polydimethylsiloxane.

2. The sound-absorbing powder coating according to claim 1, characterized in that: The isocyanate includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.

3. A method for preparing a sound-absorbing powder coating according to any one of claims 1 to 2, characterized in that: The steps include: Step 1, weigh each raw material; Step 2, mixing raw materials in a reaction vessel; Step 3: delivering the product to an extruder for melt extrusion, followed by tableting, crushing, and screening to obtain the sound-absorbing powder coating.

4. The method for preparing the sound-absorbing powder coating according to claim 3, characterized in that: The melting temperature is 85-105°C.

5. The method for preparing the sound-absorbing powder coating according to claim 3, characterized in that: The extruder screw speed frequency is 10-120 Hz.

6. The method for preparing the sound-absorbing powder coating according to claim 3, characterized in that: The particle size of the screening is 100-500 meshes.

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