CN111440263A

CN111440263A - Modified organic silicon resin emulsion, hydrophobic coating for air conditioner radiator and preparation method of hydrophobic coating

Info

Publication number: CN111440263A
Application number: CN202010288994.7A
Authority: CN
Inventors: 阮济衡; 杨文宇; 纪春发; 刘忠民
Original assignee: Jiangmen Paint Factory Co ltd; Hisense Guangdong Air Conditioning Co Ltd
Current assignee: Jiangmen Paint Factory Co ltd; Hisense Guangdong Air Conditioning Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-07-24
Anticipated expiration: 2040-04-14
Also published as: CN111440263B

Abstract

The invention provides a modified organic silicon resin emulsion, a hydrophobic coating for an air conditioner radiator and a preparation method thereof, wherein the hydrophobic coating for the air conditioner radiator comprises the following components in percentage by weight: 30-50% of modified organic silicon resin emulsion, 10-26% of methylated melamine formaldehyde resin, 0.5-3% of adhesion auxiliary agent, 0.5-3% of pH regulator, 0.5-15% of antifouling agent, 0.2-2% of thickening agent, 4-20% of functional auxiliary agent and the balance of water. The hydrophobic coating is prepared, and is particularly suitable for coating the aluminum fins of air-conditioning radiators, the aluminum fins coated with the hydrophobic coating can make water drops or impurity pollutants condensed on the surfaces difficult to attach and quickly fall off, the frosting time of the surfaces of the fins is obviously delayed, the heating capacity and the heating energy efficiency of the air-conditioning are effectively improved, the refrigerating efficiency is equivalent, the working efficiency of the air-conditioning is improved, and the energy consumption is reduced.

Description

Modified organic silicon resin emulsion, hydrophobic coating for air conditioner radiator and preparation method of hydrophobic coating

Technical Field

The invention belongs to the technical field of coatings, and relates to a modified organic silicon resin emulsion and a hydrophobic coating, in particular to a hydrophobic energy-saving water-based coating and a preparation method thereof.

Background

The air conditioner radiator is generally formed by punching aluminum foils into fins in a certain shape and then assembling the fins, wherein the aluminum foils are generally coated with hydrophilic coatings before punch forming, and the hydrophilic coatings are used for promoting condensed water drops on the radiator to be quickly spread and flow away in the refrigeration state of an air conditioner, taking away heat and increasing the heat dissipation efficiency, so that the working efficiency of the air conditioner is improved, and electric energy is saved. However, when the air temperature is close to zero or lower than zero and the air conditioner is in a heating state, the condensed water drops on the radiator of the outdoor unit quickly frost, so that the radiator cannot smoothly discharge heat, the air conditioner automatically enters a defrosting program, the defrosting program is frequently started, the heating efficiency of the air conditioner is greatly reduced, and the electric energy consumption of the air conditioner is increased. Therefore, the novel hydrophobic coating which can delay or prevent the condensation of water drops on the fins of the air conditioner radiator to frost when the air conditioner is in a heating state, reduces the defrosting time of the air conditioner and does not influence the energy efficiency of the air conditioner in a cooling state is developed and coated on the aluminum fins of the air conditioner radiator, so that the novel hydrophobic coating inevitably plays a good improvement role in improving the working efficiency of the air conditioner and saving electric energy and has high market value.

Disclosure of Invention

Based on the problems, the invention aims to provide a hydrophobic coating for an air conditioner radiator, which is prepared by adopting modified organic silicon resin emulsion as a main film forming substance, adopting methylated melamine formaldehyde resin as a cross-linking substance and compounding proper materials such as a pH value regulator, an adhesion promoter, an antifouling agent, a thickening agent, a functional promoter and the like through a specific process, and has the advantages that the coating action after coating and film forming is different from that of a traditional hydrophilic coating and also different from that of a super-hydrophobic coating in the current hot door research field, water drops or impurity pollutants condensed on the surface of an aluminum fin coated with the coating can be difficult to attach and quickly fall off, the frosting time of the surface of the fin is obviously delayed, the air conditioner assembled by the fin is improved by nearly 20 percent compared with the heating capacity of the traditional hydrophilic film-coated aluminum fin radiator, the heating energy efficiency is improved by over 10 percent. The invention also relates to a preparation method of the hydrophobic coating for the air-conditioning radiator and the main resin (modified organic silicon resin emulsion) thereof.

One technical solution adopted by the present invention to solve the above technical problems is:

the hydrophobic coating for the air conditioner radiator comprises the following components in percentage by weight:

preferably, the modified silicone resin emulsion has a solids content of 35.0% to 50.0%.

Preferably, the modified organic silicon resin is polyacrylate-siloxane copolymer emulsion, the hydroxyl value is 60-150mgKOH/g, the molecular weight Mw is 200000-500000, and the content of silicon-oxygen bonds (Si-O) is 0.50-4.0%.

The invention also provides a synthesis formula component of the modified organic silicon resin emulsion.

The modified organic silicon resin emulsion comprises the following raw materials in percentage by weight:

preferably, the acrylate monomer is one or more of butyl acrylate, methyl methacrylate, hydroxyethyl methacrylate and hydroxypropyl acrylate.

Preferably, the silane monomer is one or more of methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane and (3-acryloyloxy) dimethylmethoxysilane.

Preferably, the emulsifier is one or more of isomeric dodecyl alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, sodium dodecyl benzene sulfonate, sodium dodecyl diphenyl ether disulfonate and a nonionic emulsifier A-103.

Preferably, the initiator is at least one of ammonium persulfate and potassium persulfate.

The invention also provides a preparation method of the modified organic silicon resin emulsion in the hydrophobic coating formula for the air-conditioning radiator.

The preparation method of the modified organic silicon resin emulsion comprises the following steps:

mixing acrylate monomers, silane monomers, styrene, partial emulsifier and partial water, and stirring to obtain a pre-emulsion;

mixing an initiator and part of water, and stirring to obtain an initiator solution;

and mixing the residual emulsifier and the residual water, introducing nitrogen, stirring, heating, and adding the obtained pre-emulsion and the obtained initiator solution to obtain the modified organic silicon resin emulsion.

Preferably, the acrylic ester monomer, the silane monomer, the styrene, the partial emulsifier and part of water are mixed and stirred for 20-60min to obtain the pre-emulsion. The amounts of water and emulsifier used in this step are determined to enable emulsification of the pre-emulsion formulation components.

More preferably, the acrylate monomer, the silane monomer, the styrene, the partial emulsifier and part of water are added into a reaction kettle to be mixed, and stirred for 30-40min to obtain the pre-emulsion.

Further preferably, the acrylate monomer, the silane monomer, the styrene, the partial emulsifier and the part of water are added into a reaction kettle to be mixed, and stirred for 30-40min at the stirring speed of 800-1000rpm to obtain the pre-emulsion.

Preferably, the initiator and 8-12 times the amount of water of the initiator are mixed and stirred to obtain an initiator solution.

Preferably, mixing the residual emulsifier and the residual water, introducing nitrogen, stirring, heating to 70-80 ℃, dropwise adding the obtained pre-emulsion and the obtained initiator solution, preserving heat, then cooling, and filtering to obtain the modified silicone resin emulsion.

More preferably, mixing the residual emulsifier and the residual water, introducing nitrogen, stirring, heating to 70-80 ℃, dropwise adding the obtained pre-emulsion and the obtained initiator solution, preserving the temperature for 1-3 hours, then cooling to below 50 ℃, and filtering to obtain the modified silicone resin emulsion. It is further preferred that the filtration is performed with 200 mesh filter bags, screens and filters of similar mesh size.

Specifically, the preparation method of the modified silicone resin emulsion comprises the following steps:

(1) adding the acrylate monomer, the silane monomer, the styrene, part of the emulsifier and part of water into an emulsifying kettle according to the weight percentage for mixing, stirring at 1000rpm of 800-;

(2) adding the initiator and deionized water of which the amount is 8-12 times that of the initiator into the other dripping tank for mixing and stirring to obtain an initiator solution;

(3) adding the residual emulsifier and the residual water into a reaction kettle, mixing, introducing nitrogen, stirring, heating to 70-80 ℃, dropwise adding the obtained pre-emulsion and the obtained initiator solution within 180min of 120-fold, preserving the heat for 1-3 hours, then cooling to below 50 ℃, and filtering by using a filter bag of 200 meshes to obtain the modified organic silicon resin emulsion.

The hydrophobic coating provided by the invention takes modified organic silicon resin emulsion as a main film forming material, and is compounded with materials such as an antifouling agent, a fluorine-containing leveling agent and the like, so that a coating film has proper hydrophobicity, and the surface frosting time of a radiator is delayed after the coating film is applied.

Preferably, the methylated melamine formaldehyde resin is one or more of hexamethoxy methyl melamine formaldehyde resin, tetramethoxy methyl melamine formaldehyde resin and methylated imino melamine formaldehyde resin.

According to the invention, a proper amount of methylated melamine formaldehyde resin is added to form a cross-linked network with the modified organic silicon resin emulsion during curing and film forming, so that the adhesion of a coating film to a substrate is improved, and the performances of water resistance, volatile oil resistance, hardness, acid and alkali resistance and the like are improved.

Specifically, the hexamethoxymethylmelamine formaldehyde resin is CYME L303 of American Zhan New (Allnex) company or Resimene 747 of Enlishi (Ineos), the tetramethoxymethylmelamine formaldehyde resin is Resimene HM2608 of Ineos company, and the methylated iminomethylmelamine formaldehyde resin is Resimene 717 of Ineos company or CYME L325 of Allnex company.

Preferably, the adhesion promoter is one or more of epoxy phosphate, polyester phosphate, epoxy trimethoxy silane and bis-amino trimethoxy silane.

The addition of the adhesion promoter can provide additional crosslinking reaction and promote the dry/wet adhesion of the coating to the substrate; and the adhesion auxiliary agent forms some chemical bonds (Al-Si bonds and/or Al-P bonds) between the main film forming matter and the aluminum substrate after being baked, so that the surface structure of the coating film is more compact, and the salt spray resistance of the coating film and the original performance index of the coating film still can be greatly promoted under long-time work.

Specifically, the epoxy phosphate is available from L ubrizol, USA

2061 or

2062 or Eterkyd4901-B-72 from Changxing chemical Co., Ltd, and the polyester phosphate is L ubizol

2063; the epoxy trimethoxy silane is Z-6040 from Dow Corning, Inc; the bisaminotrimethoxysilane is Z-6020 available from Dow Corning.

Preferably, the pH regulator is selected from one or more of 2-amino-2-methyl-1-propanol, N-dimethylethanolamine, triethanolamine and 2, 2' -iminodiethanol.

Preferably, the antifouling agent is selected from one or more of sol-gel type silane, amino siloxane emulsion, oxidized polyethylene wax and paraffin wax mixture, sheet paraffin wax and organic silicon modified polyacrylate solution containing hydroxyl functional groups.

In particular, the sol-gel type silane is that of Evonik company

SIVO 110, wherein the aminosiloxane emulsion is Phobe1401 from Evonik company, the oxidized polyethylene wax and paraffin wax mixture is Brophob E790 from Netherlands and Xipu (Solpro), the flaky paraffin wax is Brophob E715 from Solpro company, and the organic silicon modified polyacrylate solution containing hydroxyl functional groups is BYK-SI L C L EAN 3700 from BYK company.

The antifouling agent selected by the invention forms an interpenetrating network or a hybrid structure with a main film forming matter after the coating is formed into a film, and the interpenetrating network or the hybrid structure is uniformly distributed in the interior and on the surface of the film, so that the film can still keep higher hydrophobic antifouling capacity even if the film is worn after long-time use.

Preferably, the thickener is one or more of nonionic polyurethane thickener, anionic water-based acrylic acid thickener, acrylic acid copolymer emulsion type thickener and association type polyether thickener.

In particular, the nonionic polyurethane thickener is available from M ü nzing, Germany

PUR60, RHEO L ATE-288 of Hamming Germany, or WT-105A, and the anionic aqueous acrylic thickener is M ü nzing, Germany

AP 20; the acrylic copolymer emulsion thickener is RHEOVASS 1130 of BASF company; the associative polyether thickener is RHEOVIS PE1331 from BASF.

Preferably, the functional auxiliary agent further comprises one or more of a wetting agent, a defoaming agent, a leveling agent, a film-forming auxiliary agent and a cosolvent. The wetting agent, the defoaming agent, the flatting agent, the film forming assistant, the cosolvent and other assistants in the hydrophobic coating play roles in wetting, defoaming, leveling, film forming promotion, storage stability, volatilization rate regulation and the like generally required by the water-based coating.

More preferably, the wetting agent is one or more of polyether siloxane copolymer and organosilicon gemini structure surfactant.

In particular, the polyether siloxane copolymer is of Evonik, Germany

WET 270, BYK-346, BYK348 from BYK, Germany, or SW452 from SYNTHRON, France, or DC502W from DOW CORNING, USA; the organosilicon gemini structure surfactant is prepared by Evonik company of Germany

TWIN4100。

More preferably, the defoaming agent is one or more of siloxane copolymer, polysiloxane polyether copolymer and a mixture of the polysiloxane polyether copolymer and fumed silica.

Specifically, the siloxane copolymer is EFKA-2503 from EFKA of the Netherlands, or BYK-024, BYK-028 from BYK of Germany; the polysiloxane polyether copolymer is EFKA-2550 from the Netherlands EFKA company or Evonik company from Germany

Foamex 800; the mixture of the polysiloxane polyether copolymer and the fumed silica is prepared by Evonik company

Airex902W。

More preferably, the leveling agent is one or more of a nonionic fluorine-containing polyoxyethylene surfactant, an amphoteric amine oxide fluorine surfactant, a fluorocarbon copolymer and a fluorosilicone copolymer.

Specifically, the nonionic fluorine-containing polyoxyethylene-based surfactant is American ginseng

ZonylFSO-100 from Inc.; the amphoteric amine oxide fluorine surfactant is American

Company Capsule FS-51; the fluorocarbon copolymer is EFKA 3600 or EFKA-3772 of Netherlands EFKA company; the fluorine-silicon copolymer is EFKA-3034 of Netherlands EFKA company.

More preferably, the film forming auxiliary agent is one or more of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, hexadecanediol ester, dipropylene glycol butyl ether (DPNB), diethylene glycol butyl ether (BDG) and tripropylene glycol butyl ether (TPM).

More preferably, the cosolvent is one or more of propylene glycol methyl ether (PM), isopropanol and n-butanol.

Preferably, the water is one or more of tap water, deionized water, distilled water, double distilled water, purified water and ultrapure water.

The invention also provides a preparation method of the hydrophobic coating for the air conditioner radiator, which comprises the following steps:

mixing the modified organic silicon resin emulsion, the methylated melamine-formaldehyde resin, water and part of the pH regulator, and stirring to obtain a mixed solution I;

adding the adhesion auxiliary agent, the antifouling agent and the functional auxiliary agent into the obtained mixed solution I, mixing and stirring to obtain mixed solution II;

adding the rest pH regulator into the obtained mixed solution II, mixing and stirring to obtain a mixed solution III;

and adding a thickening agent into the obtained mixed solution III, mixing and stirring to obtain the hydrophobic coating.

Preferably, the modified organic silicon resin emulsion, the methylated melamine formaldehyde resin, the water and part of the pH regulator are mixed, the stirring speed is 300-3000rpm, and the mixture is stirred for 5-30min to obtain a mixed solution I. In this step, the amount of the pH regulator is preferably added so as to control the pH of the first mixed solution to 7.1 to 10.0, more preferably, to 8.0 to 9.5.

Preferably, the adhesion promoter, the antifouling agent and the functional promoter are added into the obtained mixed solution I to be mixed, and the mixed solution II is obtained by stirring at the stirring speed of 1000-8000rpm for 5-30 min.

Preferably, the rest pH regulator is added into the obtained mixed solution II to be mixed, the stirring speed is 500-5000rpm, and the stirring is carried out for 5-25min, so as to obtain a mixed solution III. In this step, when the pH adjuster is added to the obtained mixed solution II, the amount of the pH adjuster is preferably added so as to control the pH of the mixed solution III to 7.1 to 10.0. More preferably, the amount of the pH regulator is added to control the pH of the mixture III to 8.0 to 9.5.

Preferably, the thickener is added into the obtained mixed solution III, and the mixture is mixed, wherein the stirring speed is 300-3000rpm, and the stirring is carried out for 5-30min, so as to obtain the hydrophobic coating.

Preferably, the stirring is performed using at least one of a stirrer, a disperser, and a homogenizer.

Specifically, the preparation method of the hydrophobic coating for the air conditioner radiator comprises the following steps:

(1) mixing the modified organic silicon resin emulsion, the methylated melamine-formaldehyde resin, water and part of the pH regulator, wherein the stirring speed is 300-3000rpm, and stirring for 5-30min to obtain a mixed solution I;

(2) adding the adhesion auxiliary agent, the antifouling agent and the functional auxiliary agent into the obtained mixed solution I, mixing at the stirring speed of 1000-8000rpm for 5-30min to obtain a mixed solution II;

(3) adding the rest pH regulator into the obtained mixed solution II, mixing at the stirring speed of 500-5000rpm for 5-25min to obtain a mixed solution III;

(4) and adding the thickening agent into the obtained mixed solution III, mixing and stirring at the stirring speed of 300-3000rpm for 5-30min to obtain the hydrophobic coating.

More specifically, the preparation method of the hydrophobic coating for the air conditioner radiator comprises the following steps:

(1) adding the modified organic silicon resin emulsion, the methylated melamine formaldehyde resin, the deionized water and about 50% of the pH regulator in sequence according to the weight percentage, stirring by using a dispersion machine at the stirring speed of 800rpm for 25min to obtain a mixed solution I;

(2) maintaining the rotating speed of the dispersion machine at 6500rpm, adding one or more of adhesion auxiliary agent, antifouling agent and functional auxiliary agent, and continuously stirring for 8 min;

(3) maintaining the rotation speed of the dispersion machine at 1000rpm, adding the rest pH regulator, and continuously stirring for 22 min;

(4) and (3) keeping the rotating speed of the dispersion machine at 2500rpm, adding the thickening agent, and continuously stirring for 9min to obtain the hydrophobic coating.

The invention has the following beneficial effects:

(1) the invention adopts the self-developed modified organic silicon resin emulsion as the main film forming substance, the compounded antifouling agent ensures that the coating film has lower surface energy and has hydrophobic property and water repellency, and water vapor in the air is difficult to condense and coalesce into larger water drops on the surface of the coating film, thereby being capable of delaying the time of surface frosting.

(2) According to the invention, the methylated melamine formaldehyde resin and the adhesion auxiliary agent are added, and multiple crosslinking reaction mechanisms are introduced, so that the coating forms a highly crosslinked coating film with higher density after film forming reaction, the long-acting maintenance of the hydrophobicity of the coating is facilitated, and better corrosion resistance is provided.

(3) The hydrophobic coating provided by the invention has excellent performance, meets all technical index requirements of an aluminum foil coating for an air conditioner, has VOC content meeting the national standard requirements, has a simple process, and is a green and environment-friendly product which is easy to produce and control the product quality.

(4) After the hydrophobic coating provided by the invention is coated on the aluminum fin of the air conditioner radiator, the neutral salt spray corrosion resistance of the fin reaches more than 500 hours, and the damp and heat resistance of the fin reaches more than 500 hours, so that the heating capacity of the air conditioner is improved by nearly 20% compared with that of the traditional hydrophilic coating film aluminum fin radiator, the heating efficiency is improved by over 10%, and the refrigerating efficiency is equivalent, so that the working efficiency of the air conditioner is improved, and the energy consumption is reduced.

Drawings

FIG. 1 is an IR spectrum of a sample of the modified silicone resin emulsion obtained in example 1 as it is.

FIG. 2 is an NMR spectrum of a dried sample of the modified silicone resin emulsion obtained in example 1.

FIG. 3 shows Py-GCMS test results of dry samples of modified silicone resin emulsion obtained in example 1.

Detailed Description

The invention will now be described in detail with reference to specific examples, which are intended to illustrate the invention but not to limit it further.

Example 1

A formula and a process of modified organic silicon resin emulsion,

the formula of the modified organic silicon resin emulsion comprises the following components:

(1) adding the material A into an emulsifying kettle, stirring at 1000rpm for 30min, then adding into a dropping tank, keeping stirring at 80rpm, opening the dropping tank to cool water, and requiring the temperature of the dropping tank to be less than or equal to 35 ℃ to obtain pre-emulsion for later use;

(2) accurately weighing the material B, adding the material B into the other dripping tank, and stirring until the material B is completely dissolved to obtain an initiator solution for later use;

(3) adding the material C into a reaction kettle, introducing nitrogen, starting stirring, heating to raise the temperature, starting dropwise adding the obtained pre-emulsion and the obtained initiator solution when the reaction temperature is raised to (72 +/-2) ° C for (170 +/-10) minutes, preserving the temperature for 2 hours at the temperature, then starting cooling, and filtering by using a filter bag of 200 meshes when the temperature is lowered to below 50 ℃ to obtain the modified organic silicon resin emulsion.

The modified silicone resin emulsion obtained in example 1 is polyacrylate-siloxane copolymer emulsion, the solid content is 43.0%, the hydroxyl value is 80.3mg KOH/g, the molecular weight Mw is 340000, and the Si-O content is 0.53% (the silicon-oxygen content is detected by a Raman spectroscopy method characterized by GB/T32871-2016-single-walled carbon nanotubes, the same is applied below), and the type of the modified silicone resin emulsion obtained in example 1 is designated as PJ-SI L-01.

Example 2

Formula and process of modified organic silicon resin emulsion

(1) adding the material A into an emulsifying kettle, stirring at 800rpm for 40min, then adding into a dropwise adding tank, keeping stirring at 60rpm, opening the dropwise adding tank to cool water, and requiring the temperature of the dropwise adding tank to be less than or equal to 35 ℃ to obtain pre-emulsion for later use;

(3) adding the material C into a reaction kettle, introducing nitrogen, starting stirring, heating to raise the temperature, starting dropwise adding the obtained pre-emulsion and the obtained initiator solution when the reaction temperature is raised to (78 +/-2) ° C for (130 +/-10) minutes, preserving the temperature for 1 hour at the temperature, then starting cooling, and filtering by using a filter bag of 200 meshes when the temperature is lowered to below 50 ℃ to obtain the modified organic silicon resin emulsion.

The modified silicone resin emulsion obtained in example 2 was a polyacrylate-siloxane copolymer emulsion having a solid content of 48.0%, a hydroxyl value of 150.0mg KOH/g, a molecular weight Mw of 210000, and a Si-O content of 1.90%, and the modified silicone resin emulsion obtained in example 2 was designated PJ-SI L-02.

Example 3

Formula and process of modified organic silicon resin emulsion

(1) adding the material A into an emulsifying kettle, stirring at 900rpm for 33min, then adding into a dropwise adding tank, keeping stirring at 100rpm, opening the dropwise adding tank to obtain cooling water, and requiring the temperature of the dropwise adding tank to be less than or equal to 35 ℃ to obtain pre-emulsion for later use;

(3) adding the material C into a reaction kettle, introducing nitrogen, starting stirring, heating to raise the temperature, starting dropwise adding the obtained pre-emulsion and the obtained initiator solution when the reaction temperature is raised to (75 +/-2) DEG C for (150 +/-10) minutes, preserving the temperature for 3 hours at the temperature, then starting cooling, and filtering by using a filter bag of 200 meshes when the temperature is lowered to below 50 ℃ to obtain the modified organic silicon resin emulsion.

The modified silicone resin emulsion obtained in example 3 was a polyacrylate-siloxane copolymer emulsion having a solid content of 35.0%, a hydroxyl value of 60.5mg KOH/g, a molecular weight Mw of 490000, and a Si-O content of 3.9%, and the modified silicone resin emulsion obtained in example 3 was designated PJ-SI L-03.

Example 4

A sample of the modified silicone resin emulsion obtained in example 1 was analyzed and examined by infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and thermal cracking gas chromatography mass spectrometry (Py-GCMS).

Referring to FIG. 1, the infrared spectrum of the sample as it is, 3417cm in the sample^-1Is associated with O-H bond, peaks at 1731cm^-1Is the peak of ester carboxyl group, 1650cm^-1Is the infrared peak of water, 2958cm^-1、2872cm^-1、1385cm^-1Is a methyl peak at 1455cm^-1Is a methylene peak at 1574cm^-1May be N-H bond peak or C ═ O salifying peak, 1260cm^-1、892cm^-1、804cm^-1Is the peak of C-Si bond, 1075cm^-1Is the peak of Si-O-Si bond, 763cm^-1、703cm^-1It is a benzene ring peak.

Referring to FIG. 2, the NMR spectrum of a dried sample is shown, in which 0ppm is a peak of methyl group bonded to silicon, 0.85ppm is a peak of methyl group bonded to nitrogen, 1.12ppm, 1.31ppm and 1.53ppm are peaks of methylene group, 2.75ppm is a peak of hydrogen group bonded to nitrogen, 3.05ppm is a peak of hydrogen group bonded to nitrogen, 3.41ppm, 3.54ppm and 3.67ppm are peaks of hydrogen group bonded to oxygen, 3.97ppm is a peak of hydrogen group bonded to oxygen, 4.90ppm is a peak of hydrogen group bonded to oxygen, and 6.98ppm is a peak of benzene ring.

See FIG. 3 for Py-GCMS test results of dry samples, from which the fragment information of methyl methacrylate, butyl acrylate, silicone, hydroxyethyl methacrylate, hydroxypropyl acrylate and styrene can be seen.

Example 5

The hydrophobic coating for the air conditioner radiator comprises the following components:

the preparation method of the hydrophobic coating comprises the following steps:

(1) sequentially adding 1-3 serial numbers and 50% of 4 serial numbers according to the formula amount in parts by weight, starting a high-speed dispersion machine, rotating at 300rpm, and stirring for 30 min;

(2) keeping the rotating speed of the dispersion machine at 8000rpm, adding the components with the serial numbers of 5-11, and continuously stirring for 5 min;

(3) keeping the rotating speed of the dispersion machine at 500rpm, adding the rest 50 percent of the serial number 4 component of the formula amount, and continuously stirring for 25 min;

(4) and keeping the rotating speed of the dispersion machine at 3000rpm, adding the components with the serial number of 12, and continuously stirring for 5min to obtain the hydrophobic coating for the air-conditioning radiator.

Example 6

(1) sequentially adding 1-3 serial numbers and 50% of 4 serial numbers according to the formula amount in parts by weight, starting a high-speed dispersion machine, rotating at 3000rpm, and stirring for 5 min;

(2) keeping the rotating speed of the dispersion machine at 1000rpm, adding the serial number of 5-11 components, and continuing stirring for 30 min;

(3) keeping the rotating speed of the dispersion machine at 5000rpm, adding the number 4 components accounting for the remaining 50 percent of the total amount of the formula, and continuously stirring for 5 min;

(4) and keeping the rotating speed of the dispersion machine at 300rpm, adding the serial number 12 components, and continuously stirring for 30min to obtain the hydrophobic coating for the air-conditioning radiator.

Example 7

(1) sequentially adding 1-3 serial numbers and 40% of 4 serial numbers according to the formula amount in parts by weight, starting a high-speed dispersion machine, rotating at 800rpm, and stirring for 25 min;

(2) keeping the rotating speed of the dispersion machine at 6500rpm, adding the components with the serial numbers of 5-11, and continuously stirring for 8 min;

(3) keeping the rotating speed of the dispersion machine at 1000rpm, adding the number 4 components accounting for the remaining 60 percent of the total amount of the formula, and continuing stirring for 22 min;

(4) and keeping the rotating speed of the dispersion machine at 2500rpm, adding the components with the serial number of 12, and continuously stirring for 9min to obtain the hydrophobic coating for the air-conditioning radiator.

Example 8

(1) sequentially adding 1-3 serial numbers and 60% of 4 serial numbers according to the formula amount in parts by weight, starting a high-speed dispersion machine, rotating at 1700rpm, and stirring for 16 min;

(2) keeping the rotating speed of the dispersing machine to 5500rpm, adding the components with the serial numbers of 5-11, and continuously stirring for 14 min;

(3) keeping the rotating speed of the dispersion machine at 2600rpm, adding the number 4 component accounting for the remaining 40 percent of the total amount of the formula, and continuing stirring for 13 min;

(4) keeping the rotating speed of the dispersion machine at 2000rpm, adding the serial number 12 components, and continuously stirring for 15min to obtain the hydrophobic coating for the air-conditioning radiator.

Example 9

(1) sequentially adding 1-3 serial numbers and 50% of 4 serial numbers according to the formula amount in parts by weight, starting a high-speed dispersion machine, and stirring for 14min at the rotating speed of 2300 rpm;

(2) keeping the rotating speed of the dispersion machine at 2100rpm, adding the serial number of 5-11 components, and continuing stirring for 25 min;

(3) keeping the rotating speed of the dispersion machine at 3200rpm, adding the number 4 components accounting for the remaining 50 percent of the total amount of the formula, and continuously stirring for 16 min;

(4) and keeping the rotating speed of the dispersion machine at 1500rpm, adding the components with the serial number of 12, and continuously stirring for 20min to obtain the hydrophobic coating for the air-conditioning radiator.

Example 10

(1) sequentially adding 1-3 serial numbers and 50% of 4 serial numbers according to the formula amount in parts by weight, starting a high-speed dispersion machine, rotating at 1300rpm, and stirring for 19 min;

(2) keeping the rotating speed of the dispersion machine at 4000rpm, adding the components with the serial numbers of 5-11, and continuously stirring for 20 min;

(3) keeping the rotating speed of the dispersion machine at 4200rpm, adding the number 4 component accounting for the rest 50 percent of the total amount of the formula, and continuously stirring for 8 min;

(4) and keeping the rotating speed of the dispersion machine at 1000rpm, adding the serial number 12 components, and continuously stirring for 25min to obtain the hydrophobic coating for the air-conditioning radiator.

Comparative example 1

The commercially available American home-made waterborne modified acrylic amino baking varnish type hydrophilic coating.

Comparative example 2

The commercial hydrophilic coating of the waterborne modified acrylic amino baking varnish type produced by Guangdong China.

Example 11

The hydrophobic coatings for air conditioners and radiators prepared in examples 5-10 and the hydrophilic coatings of comparative examples 1-2 are subjected to performance tests, wherein the acid value is GB/T6743-2008, the nonvolatile content is GB/T1725-2007, the viscosity is GB/T1723-1993, the neutral salt spray test is GB/T1771-2007, the adhesion (grid test) is GB/T9286-1998, and the humidity resistance is GB/T1740-2007, and the test results are shown in the following table 1, and all the detection values meet the standard requirements.

TABLE 1 detection of hydrophobic coatings for air conditioner radiators

Example 12

The four coatings of the embodiment 5, the embodiment 7, the comparative example 1 and the comparative example 2 are respectively coated on the same radiator aluminum fin, cured to form a film, and assembled into the air conditioner of the same machine type for testing the heating and refrigerating performance, the test is carried out according to the T1 climate type in the test working condition of the GB/T7725 plus 2004 Room air conditioner table 3, the test data is as the following table 2, wherein the capacity represents the heating capacity when the heating is carried out at low temperature, and represents the refrigerating capacity when the refrigeration is rated.

TABLE 2 air conditioner heating and cooling capability test

The heating and cooling performances of the air conditioners assembled by the radiators coated with the four coatings of the example 5, the example 7, the comparative example 1 and the comparative example 2 are compared, and the table 2 shows that the cooling capacity and the cooling energy efficiency of the air conditioners coated with the four coatings of the example 5, the example 7, the comparative example 1 and the comparative example 2 are equivalent under the rated cooling state, wherein the cooling capacity of the example 7 is only 0.20 percent lower than that of the comparative example 1. However, in the state of low-temperature heating (see table 3), the heating capacity of the air conditioner of example 5 is improved by 7.58% and 11.18% and the energy efficiency is improved by 5.84% and 7.59% respectively compared with those of comparative example 1 and comparative example 2; the heating capacity of the air conditioner in the embodiment 7 is respectively improved by 13.20% and 17.00% compared with the comparative example 1 and the comparative example 2, and the energy efficiency is respectively improved by 9.45% and 11.25%; in addition, it can be seen from table 2 that the defrosting cycles of example 5 and example 7 are significantly longer than those of comparative example 1 and comparative example 2, which shows that the frosting condition of the air conditioner radiators using example 5 and example 7 is effectively improved, and the power consumption for starting the defrosting process is reduced. In conclusion, the hydrophobic coating for the air conditioner radiator is obviously superior to the conventional hydrophilic coating in the aspect of low-temperature heating capacity, and has equivalent rated refrigerating capacity, so that the working efficiency of an air conditioner is improved, and the energy consumption is reduced.

TABLE 3 comparison of air-conditioning low-temperature heating performance

Note: two decimal points are reserved for energy efficiency and percentage in the table 3, and the percentage is calculated by adopting the original data of heating capacity and energy efficiency.

The above examples are given for the purpose of illustrating the invention clearly and not for the purpose of limiting the same, and it will be apparent to those skilled in the art that, in light of the above description, numerous modifications and variations can be made in the form and details of the embodiments of the invention described herein, and it is not intended to be exhaustive or to limit the invention to the precise forms disclosed.

Claims

1. The modified organic silicon resin emulsion is characterized by comprising the following raw materials in percentage by weight:

2. the modified silicone resin emulsion of claim 1, wherein the acrylate monomer is one or more of butyl acrylate, methyl methacrylate, hydroxyethyl methacrylate and hydroxypropyl acrylate.

3. The modified silicone resin emulsion according to claim 1, wherein the silane monomer is one or more selected from methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, and (3-acryloyloxy) dimethylmethoxysilane.

4. The modified silicone resin emulsion of claim 1, wherein the emulsifier is one or more of isomeric dodecyl polyoxyethylene ether, alkylphenol polyoxyethylene, sodium dodecyl benzene sulfonate, sodium dodecyl diphenyl ether disulfonate, and nonionic emulsifier A-103; the initiator is at least one of ammonium persulfate and potassium persulfate.

5. The method for producing the modified silicone resin emulsion according to any one of claims 1 to 4, characterized by comprising the steps of:

6. The hydrophobic coating for the air conditioner radiator is characterized by comprising the following components in percentage by weight:

7. the hydrophobic coating for the air-conditioning radiator as recited in claim 6, wherein the methylated melamine formaldehyde resin is one or more of hexamethoxy methyl melamine formaldehyde resin, tetramethoxy methyl melamine formaldehyde resin and methylated imino melamine formaldehyde resin.

8. The hydrophobic coating for the air-conditioning radiator as claimed in claim 6, wherein the adhesion promoter is one or more of epoxy phosphate, polyester phosphate, epoxy trimethoxy silane and bis-amino trimethoxy silane.

9. The hydrophobic coating for an air conditioner radiator as claimed in claim 6, wherein the antifouling agent is selected from one or more of sol-gel type silane, amino siloxane emulsion, oxidized polyethylene wax and paraffin wax mixture, flake paraffin wax and organosilicon modified polyacrylate solution containing hydroxyl functional group; the functional auxiliary agent comprises one or more of a wetting agent, a defoaming agent, a flatting agent, a film-forming auxiliary agent and a cosolvent.

10. The method for preparing the hydrophobic coating material for an air conditioner radiator according to any one of claims 6 to 9, comprising the steps of: