Durable reflective thermal insulation coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and particularly discloses a durable reflective thermal insulation coating and a preparation method thereof. The coating provided by the invention comprises a finish paint and a primer, the finish paint comprises a component A and a component B, the primer comprises a component C and a component D, resin in the component A is limited to comprise fluorocarbon resin and hydroxy acrylic resin modified by a first silane coupling agent, nano-zinc oxide is selected as a filler in the component A, and nano-zinc oxide is selected as a filler in the component B; the resin in the component C comprises flexible epoxy resin and epoxy resin modified by a second silane coupling agent, and the modified rutile type titanium dioxide in the component C comprises nano aluminum oxide and nano yttrium oxide modified rutile type titanium dioxide. According to the invention, by limiting the resin and the filler in the finishing coat, the resin in the primer and limiting a modified substance for rutile type titanium dioxide in the primer, the composite coating composed of the primer and the finishing coat achieves excellent durability, corrosion resistance and reflective insulation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a durable reflective heat-insulating coating and a preparation method thereof. Background Art

[0002] After the outer surfaces of metal objects such as storage tank equipment, buildings, and vehicles are irradiated by sunlight for a long time, the temperature can reach 50°C - 70°C, which will have an adverse impact on both the metal material itself and the internal safety of the equipment. Therefore, applying a reflective heat-insulating and cooling coating to the outer surfaces of these metal objects can effectively reduce the surface and internal temperatures of the objects, and can also effectively reduce solar radiation and improve the protection effect on metal objects.

[0003] At present, due to limitations such as environmental restrictions and short service life of waterborne heat-insulating and reflective coatings, multiple coatings and maintenance are required during the entire life cycle of the equipment, and the annual coating cost has not been reduced. There are two design situations for the primer of solvent-based heat-insulating and reflective cooling coating: one only considers anti-corrosion and does not consider the impact on the infrared reflection performance of the topcoat, and the topcoat needs to have a dry film thickness of 100μm - 150μm to have a heat-insulating and reflective cooling effect; the other considers reflective heat-insulating and cooling, but has general anti-corrosion performance, high cost, and poor cost performance. In view of the above problems, there is an urgent need to provide a durable reflective heat-insulating coating and a preparation method thereof. Summary of the Invention

[0004] Aiming at the problems that existing coatings cannot have both durability and anti-corrosion properties, and have poor heat-insulating and reflective cooling effects, the present invention provides a durable reflective heat-insulating coating and a preparation method thereof.

[0005] To solve the above technical problems, the technical solution provided by the present invention is:

[0006] The present invention provides a durable reflective heat-insulating coating, including a topcoat and a primer;

[0007] The topcoat includes component A and component B, and the primer includes component C and component D;

[0008] Component A includes a modified hydroxyl acrylic resin and nano zinc oxide;

[0009] Component B includes an isocyanate curing agent;

[0010] Component C includes a modified epoxy resin and a modified rutile titanium dioxide;

[0011] Component D includes a polyamide curing agent;

[0012] Among them, the modified hydroxyl acrylic resin is a hydroxyl acrylic resin modified by a fluorocarbon resin and a first silane coupling agent;

[0013] The modified epoxy resin is an epoxy resin modified by a flexible epoxy resin and a second silane coupling agent. The epoxy equivalent of the flexible epoxy resin is 310 - 330, and the viscosity is 60 mPa·s - 70 mPa·s;

[0014] The modified rutile titanium dioxide is rutile titanium dioxide modified by nano-aluminum oxide and nano-yttrium sesquioxide.

[0015] Compared with the prior art, the durable reflective heat-insulating coating provided by the present invention includes a primer and a topcoat. Among them, a modified hydroxyl acrylic resin is added to the topcoat, which has functional groups such as a large number of hydroxyl groups, siloxane groups, and fluorine elements. This enables the modified hydroxyl acrylic resin to have more anchoring points and crosslinking points with isocyanate curing agents, thereby forming a denser network structure. This not only improves the adhesion of the coating but also further enhances the durability and corrosion resistance of the coating; the use of the first silane coupling agent greatly increases the binding force between the hydroxyl acrylic resin and the fluorocarbon resin, thereby improving the durability and corrosion resistance of the coating; the first silane coupling agent can also react with nano-zinc oxide and infrared reflective pigments in the coating, significantly improving the stability of the overall structure of the coating, and further enhancing the durability, corrosion resistance, and adhesion of the coating; nano-zinc oxide acts as a filler in the topcoat, further improving the reflective heat-insulating effect of the coating; the fluorocarbon resin has good thermal stability and low surface energy, enabling the modified hydroxyl acrylic resin added to the coating system to have a smooth and flat coating surface, improving the reflective heat-insulating performance of the coating; the addition of the modified hydroxyl acrylic resin can also further promote the dispersion of inorganic fillers in the coating, significantly improving the reflective performance of the coating, thereby achieving the heat-insulating effect of the coating.

[0016] In the primer of the present invention, the modified epoxy resin is an epoxy resin modified by a flexible epoxy resin and a second silane coupling agent. The modified epoxy resin contains active groups such as epoxy groups, hydroxyl groups, secondary amino groups, and siloxane groups. These active groups endow the modified epoxy resin with high reactivity, enabling it to react with the modified rutile titanium dioxide, fillers, and ion-exchange type anti-corrosion pigments, thereby forming a film-like protective layer with a high crosslinking density and improving the durability and anti-corrosion performance of the coating; the second silane coupling agent added to the modified epoxy resin also helps to improve the dispersion of inorganic pigments and fillers in the coating, and further improves the reflective heat-insulating performance of the coating; the present invention modifies the epoxy resin with a flexible epoxy resin under specific conditions and adds the modified epoxy resin to the coating system, which can endow the coating with a certain flexibility, enabling it to have a buffering effect on deformation when dealing with temperature changes or mechanical damage, and also avoiding situations such as cracking and peeling caused by stress concentration, greatly improving the durability of the coating.

[0017] Nano-aluminum oxide has a relatively high hardness. After being compounded with rutile titanium dioxide, it can significantly enhance the abrasion resistance of the coating, thereby improving the service life of the coating. Moreover, the rutile titanium dioxide modified by nano-aluminum oxide can also improve the microstructure of the coating, enhance the compactness of the coating, and further enhance the durability and corrosion resistance of the coating. After modifying rutile titanium dioxide with nano-yttrium trioxide, it can optimize the light scattering performance of rutile titanium dioxide, enhance the infrared reflection ability of rutile titanium dioxide to sunlight, and then improve the reflection and heat insulation effect of the coating. In addition, after modifying rutile titanium dioxide with nano-aluminum oxide and nano-yttrium trioxide, it can also improve the compatibility and dispersion uniformity of rutile titanium dioxide in the coating system, and further improve the comprehensive performance of the coating. The addition of fillers, infrared reflection pigments, and ion-exchange type anti-corrosion pigments in the present invention can further improve the comprehensive performance of the coating.

[0018] Preferably, the component A comprises the following components in mass percentages: 55%-58% of modified hydroxyl acrylic resin, 1%-12% of nano-zinc oxide, and the balance is the first functional material.

[0019] More preferably, the first functional material comprises a mixture of a first dispersant, a first defoamer, a first anti-settling agent, an infrared reflection pigment, a first leveling agent, a light stabilizer, an ultraviolet light absorber, and a first solvent in a mass ratio of (0.7-2.0):(0.3-0.5):(1.6-3):(18-32):(0.2-0.5):(0.7-1.2):(1.4-2.4):(5.1-8.4).

[0020] Preferably, the component C comprises the following components in mass percentages: 27%-30% of modified epoxy resin, 33%-34% of modified rutile titanium dioxide, and the balance is the second functional material.

[0021] More preferably, the second functional material comprises a mixture of a second dispersant, a second defoamer, a second anti-settling agent, a filler, an ion-exchange type anti-corrosion pigment, a second leveling agent, and a second solvent in a mass ratio of (0.4-0.6):(0.2-0.5):(1.5-2.5):(18-23):(6-8):(0.2-0.5):(4.9-9.7).

[0022] More preferably, the component D comprises the following components in mass percentages: 45%-55% of polyamide curing agent and 45%-55% of a third solvent.

[0023] Preferably, the thickness of the topcoat is 50μm-70μm.

[0024] Preferably, the thickness of the primer is 110μm-130μm.

[0025] By controlling the thickness of the primer and the topcoat, the coating can achieve the best durability, corrosion resistance, and the best reflective heat insulation effect.

[0026] Preferably, the modified hydroxy acrylic resin comprises the following raw material components in mass percentages: 26%-27% of fluorocarbon resin, 62%-63% of hydroxy acrylic resin, 1.8%-2.0% of the first silane coupling agent, and 8%-10.2% of propylene glycol methyl ether acetate.

[0027] The present invention further defines the dosage of each component in the modified hydroxy acrylic resin, so that the modified hydroxy acrylic resin has a certain content of functional groups, thereby improving the crosslinking density of the modified hydroxy acrylic resin and the isocyanate curing agent, and further improving the durability and anti-corrosion performance of the coating; and a certain content of fluorocarbon resin can further improve the reflective heat insulation effect of the coating.

[0028] Preferably, the fluorocarbon resin has a fluorine content of ≥35%, a solid content of 64wt%-66wt%, a hydroxy content of 1.8wt%-1.9wt%, and a molecular weight of 10300-10500.

[0029] Preferably, the hydroxy acrylic resin has a solid content of 78wt%-82wt%, a hydroxy content of 4.1wt%-4.2wt%, a viscosity of 5000mpa.s-9000mpa.s, a molecular weight of 2980-3020, and a glass transition temperature of 24℃-26℃.

[0030] Preferably, the first silane coupling agent is an epoxy silane oligomer.

[0031] More preferably, the model of the first silane coupling agent is Momentive CoatOSil MP200.

[0032] By further defining the model of the first silane coupling agent, it is beneficial to further improve the comprehensive performance of the coating.

[0033] The preparation method of the modified hydroxy acrylic resin comprises the following steps:

[0034] a. Mix the weighed fluorocarbon resin, hydroxy acrylic resin, and propylene glycol methyl ether acetate evenly to obtain a mixed resin;

[0035] b. Add the first silane coupling agent to the mixed resin at 60℃-70℃, and keep warm to obtain the modified hydroxy acrylic resin.

[0036] The preparation method of the modified hydroxyl acrylic resin provided by the present invention is simple. By selecting a fluorocarbon resin and a first silane coupling agent to modify the hydroxyl acrylic resin, among which, through grafting reaction among the three raw materials, the prepared modified hydroxyl acrylic resin contains rich functional groups such as hydroxyl groups, siloxane groups, and fluorine elements, further improving the durability, corrosion resistance, and reflective heat insulation effect of the coating.

[0037] Preferably, in step b, the heat preservation time is 3h - 4h.

[0038] It should be further noted that stirring treatment is also required during the heat preservation.

[0039] Preferably, in step b, the dropping time of the first silane coupling agent is 3min - 5min.

[0040] Preferably, the first dispersant is at least one of a modified polyurethane polymer containing a pigment affinity group or an acrylic block copolymer.

[0041] More preferably, the first dispersant is at least one of AFCONA - 4071 or EFKA PX4310.

[0042] Preferably, the first defoamer is at least one of a silicone defoamer or a fluorosiloxane solution defoamer.

[0043] More preferably, the first defoamer is at least one of BYK - 066N or TEGO Airex 931.

[0044] Preferably, the first anti - settling agent is a mixture of a first powdery anti - settling agent and a first paste - like anti - settling agent.

[0045] More preferably, the mass ratio of the first powdery anti - settling agent to the first paste - like anti - settling agent in the first anti - settling agent is (1 - 2):(1 - 2).

[0046] More preferably, the first powdery anti - settling agent is fumed silica or organobentonite.

[0047] More preferably, the first powdery anti - settling agent is at least one of Cabot Corporation M5 or Desheng Enterprise Co., Ltd. SD - 2.

[0048] More preferably, the first paste - like anti - settling agent is polyamide wax or polyethylene wax.

[0049] More preferably, the first paste - like anti - settling agent is at least one of Disparlon 4200 - 20 or Desheng Enterprise Co., Ltd. 202P.

[0050] Preferably, the infrared reflective pigment is a metal oxide.

[0051] As a preferred embodiment, the infrared reflective pigment is at least one of iron chromium black, near-infrared reflective titanium dioxide, cerium sulfide red, cerium sulfide bright orange, bismuth vanadate yellow, titanium yellow, cobalt green, cobalt chromium green, cobalt blue, cobalt chromium blue, iron zinc chromium brown or titanium chromium brown.

[0052] Preferably, the particle size of the nano zinc oxide is 50nm - 100nm.

[0053] The present invention further defines the specific particle size of the nano zinc oxide, which is beneficial to further improve the reflection and heat insulation effect of the coating.

[0054] Preferably, the first leveling agent is an acrylate leveling agent.

[0055] More preferably, the first leveling agent is at least one of EFKA3777 or LHP-95.

[0056] Preferably, the light stabilizer is a hindered amine light stabilizer.

[0057] More preferably, the light stabilizer is at least one of TINUVIN-292 or Eversorb93.

[0058] Preferably, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0059] More preferably, the ultraviolet absorber is at least one of TINUVIN-1130 or Eversorb80.

[0060] Preferably, the first solvent is a mixture of propylene glycol monomethyl ether acetate and butyl acetate.

[0061] More preferably, the mass ratio of propylene glycol monomethyl ether acetate to butyl acetate in the first solvent is 1:(1 - 2).

[0062] Preferably, the isocyanate curing agent is an HDI trimer.

[0063] More preferably, the isocyanate curing agent is at least one of Bayer N3390 or Wanhua HT-90B.

[0064] Preferably, the mass ratio of component A to component B is (5.4 - 5.6):1.

[0065] Preferably, the modified epoxy resin comprises the following raw material components in mass percentages: 76.5% - 78.5% of epoxy resin, 19% - 20% of flexible epoxy resin and 2.5% - 3.5% of the second silane coupling agent.

[0066] The present invention further defines the dosages of raw material components in the modified epoxy resin, so that the modified epoxy resin contains certain active groups, thereby improving the durability and anti-corrosion property of the coating; by defining the dosage of the second silane coupling agent, it is also beneficial to further improve the reflective heat insulation effect of the coating.

[0067] Preferably, the epoxy resin is a polymer of bisphenol A and bisphenol A diglycidyl ether.

[0068] More preferably, the epoxy equivalent of the epoxy resin is 450 - 500, the viscosity is 8000 mPa·s - 12000 mPa·s, and the solid content is 74 wt% - 76 wt%.

[0069] Preferably, the solid content of the flexible epoxy resin is 99.5 wt% - 100 wt%.

[0070] More preferably, the flexible epoxy resin is a polymer of epichlorohydrin and polypropylene glycol.

[0071] Preferably, the second silane coupling agent is γ - glycidoxypropyltrimethoxysilane.

[0072] More preferably, the second silane coupling agent is KH560 or Yangzhou Lida LD - 3168.

[0073] By further defining the type of the second silane coupling agent, it is beneficial to further improve the comprehensive performance of the coating.

[0074] Preferably, the preparation method of the modified epoxy resin comprises the following steps:

[0075] S1. Mix the weighed epoxy resin and flexible epoxy resin evenly, and keep warm at 50°C - 60°C to obtain a mixed resin;

[0076] S2. Add the second silane coupling agent to the mixed resin at 70°C - 80°C, and then keep warm at 78°C - 82°C to obtain the modified epoxy resin.

[0077] The preparation method of the modified epoxy resin provided by the present invention can maximize the reaction among the epoxy resin, the second silane coupling agent and the flexible epoxy resin, thereby improving the comprehensive performance of the coating.

[0078] Preferably, in S1, the heat preservation time is 0.5 h - 1 h.

[0079] Preferably, in S2, the second silane coupling agent is added dropwise, the dropping time is 5 min - 6 min, and stirring is carried out at a rate of 500 r / min - 600 r / min during dropping.

[0080] Preferably, in S2, the insulation time is 1.5h-2.5h.

[0081] Preferably, the second dispersant is any one of a modified polyurethane polymer containing a pigment affinity group or a modified polyurethane containing a pigment affinity group.

[0082] Further preferably, the second dispersant is any one of AFCONA-4071 and EFKA-4010.

[0083] Preferably, the second defoaming agent is a polysiloxane mixture containing hydrophobic particles.

[0084] Further preferably, the second defoaming agent is at least one of HX2080 or Deqian 6800.

[0085] Preferably, the second anti-settling agent is a mixture of a second powdery anti-settling agent and a second paste-like anti-settling agent.

[0086] Further preferably, the mass ratio of the second powdery anti-settling agent to the second paste anti-settling agent in the second anti-settling agent is (1-2):(1-2).

[0087] Further preferably, the second powdery anti-settling agent is organic bentonite.

[0088] More preferably, the second powdered anti-settling agent is SD-2 produced by Deqian Enterprise Co., Ltd.

[0089] Further preferably, the second paste anti-settling agent is polyamide wax or polyethylene wax.

[0090] Further preferably, the second paste anti-settling agent is at least one of Desbaron 4200-20 or Deqian Enterprise Co., Ltd. 202P.

[0091] Preferably, the modified rutile titanium dioxide comprises the following raw material components in the following mass percentages: 88%-90% rutile titanium dioxide, 9.5%-11.5% nano-alumina and 0.4%-0.6% nano-yttrium oxide.

[0092] The present invention further optimizes the content of each raw material component in the modified rutile titanium dioxide, so that the prepared modified rutile titanium dioxide can further improve the comprehensive performance of the coating.

[0093] Preferably, the model of the rutile titanium dioxide is any one of DuPont R706 or TiONA696.

[0094] Preferably, the particle size of the nano-alumina is 48nm-52nm.

[0095] Preferably, the particle size of the yttrium oxide nanoparticles is 7 nm - 15 nm.

[0096] More preferably, the preparation method of the modified rutile titanium dioxide includes the following steps:

[0097] S1. Mix the weighed rutile titanium dioxide, nano-aluminum oxide, and yttrium oxide nanoparticles evenly to obtain a mixed material;

[0098] S2. Calcinate the mixed material at 1100 °C - 1200 °C to obtain the modified rutile titanium dioxide.

[0099] The present invention defines the preparation method of the modified rutile titanium dioxide. The method of high-temperature calcination is conducive to better physical and chemical fusion of rutile titanium dioxide, nano-aluminum oxide, and yttrium oxide nanoparticles, making the prepared modified rutile titanium dioxide have better stability. Applying it to coatings is beneficial to further improving the durability and corrosion resistance of the coatings, and can also endow the coatings with excellent reflective heat insulation effects.

[0100] Preferably, in S2, the calcination time is 3 h - 4 h.

[0101] Preferably, in S2, the particle size of the modified rutile titanium dioxide is 10 μm - 20 μm.

[0102] Preferably, the filler is a mixture of ultrafine mica powder, nano-zinc oxide, and zinc phosphate.

[0103] More preferably, the mass ratio of ultrafine mica powder, nano-zinc oxide, and zinc phosphate in the filler is (4 - 6):(9 - 11):(5 - 6).

[0104] The present invention further defines the specific components in the filler. When the filler selects the specific components with the above ratios, it is beneficial to further improve the reflective heat insulation effect of the coatings.

[0105] Preferably, the particle size of the ultrafine mica powder is 1480 - 1520 mesh.

[0106] Preferably, the particle size of the nano-zinc oxide is 100 nm - 200 nm.

[0107] Preferably, the model of the ion-exchange type anticorrosive pigment is W.R.Grace&Co.C500.

[0108] Preferably, the second leveling agent is an acrylate leveling agent.

[0109] More preferably, the second leveling agent is at least one of EFKA3777 or DISPARLON LHP-95.

[0110] Preferably, the second solvent is a mixture of petroleum xylene and butanol.

[0111] More preferably, the mass ratio of petroleum xylene to butanol in the second solvent is 7:(2 - 4).

[0112] Preferably, the polyamide curing agent is at least one of Air Products And Chemicals Inc. Sunmide 305 or Shanghai Junjiang Technology Co., Ltd. D8115 - 2.

[0113] Preferably, the third solvent is a mixture of petroleum xylene, butanol and propylene glycol methyl ether acetate.

[0114] More preferably, the mass ratio of petroleum xylene, butanol and propylene glycol methyl ether acetate in the third solvent is 6:(1.5 - 2.5):(1.5 - 2.5).

[0115] Preferably, the mass ratio of component C to component D is 25:(3 - 3.2).

[0116] The present invention provides a method for preparing the above - mentioned durable reflective heat - insulating coating, which comprises the following steps:

[0117] Step 1: Weigh each component according to the mass ratio. Add the weighed first dispersant, first defoamer, first anti - settling agent, first leveling agent, light stabilizer and ultraviolet absorber to the modified hydroxyl acrylic resin to obtain a first mixed slurry.

[0118] Step 2: Add the infrared reflective pigment and nano - zinc oxide to the first mixed slurry, then add the first solvent until the viscosity is 100s - 120s, mix evenly, and grind to obtain the component A.

[0119] Step 3: Mix component A and component B evenly to obtain the topcoat.

[0120] Step 4: Add the second dispersant, second defoamer, second anti - settling agent and second leveling agent to the modified epoxy resin to obtain a second mixed slurry.

[0121] Step 5: Add the modified rutile titanium dioxide, filler and ion - exchange type anticorrosive pigment to the second mixed slurry, then add the second solvent until the viscosity is 2000mpa.s - 3500mpa.s, mix evenly, and grind to obtain the component C.

[0122] Step 6: Keep the polyamide curing agent at 50°C - 60°C for heat preservation, then add the third solvent at 70°C - 80°C, mix evenly to obtain the component D.

[0123] Step 7: Mix the Component C and Component D evenly to obtain the primer.

[0124] As a preferred embodiment, the specific operation of Step 1 includes the following steps: Weigh each component according to the mass ratio. Add the weighed first dispersant, first defoamer, first paste anti-settling agent, first leveling agent, light stabilizer and ultraviolet absorber to the modified hydroxy acrylic resin, and stir at a rate of 500 r / min - 600 r / min for 3 min - 5 min. Then add the first powdery anti-settling agent and stir at a rate of 500 r / min - 600 r / min for 3 min - 5 min to obtain the first mixed slurry.

[0125] As a preferred embodiment, in Step 2, the condition for even mixing is: Stir at a rate of 800 r / min - 1000 r / min for 15 min - 20 min.

[0126] Preferably, in Step 2, the fineness of the Component A is 20 μm - 25 μm.

[0127] As a preferred embodiment, the specific operation of Step 4 includes the following steps: Add the second dispersant, second defoamer, second paste anti-settling agent and second leveling agent to the modified epoxy resin, and stir at a rate of 600 r / min - 700 r / min for 3 min - 5 min. Then add the second powdery anti-settling agent and stir at a rate of 300 r / min - 500 r / min for 3 min - 5 min to obtain the second mixed slurry.

[0128] As a preferred embodiment, in Step 5, the condition for even mixing is: Stir at a rate of 800 r / min - 1000 r / min for 15 min - 20 min.

[0129] Preferably, in Step 5, the fineness of the Component C is 20 μm - 25 μm.

[0130] Preferably, in Step 6, the heat preservation time is 2 h - 4 h.

[0131] Preferably, in Step 6, the condition for even mixing is: Stir at a rate of 600 r / min - 800 r / min for 30 min - 40 min.

[0132] As a preferred embodiment, in Step 6, after even mixing, the mixed slurry needs to be filtered.

[0133] The preparation method provided by the present invention has simple operation, no complex processes, and no special equipment required. It has low cost, is suitable for large-scale industrial production, and has broad market prospects and development potential. Specific Embodiments

[0134] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0135] Example 1

[0136] This embodiment provides a durable reflective heat-insulating coating, including a topcoat and a primer;

[0137] The topcoat comprises component A and component B, and the primer comprises component C and component D;

[0138] The component A comprises the following components in percentage by mass: 58% of modified hydroxy acrylic resin, 10.7% of AFCONA-407, 0.3% of BYK-066N, 2.3% of the first anti-settling agent, 18% of iron chrome black, 12% of nano zinc oxide with a particle size of 50 nm, 0.5% of EFKA3777, 0.7% of TINUVIN-292, 2.4% of TINUVIN-1130 and 5.1% of the first solvent; the first anti-settling agent comprises 1:1 of Cabot Corporation M5 and Desbaron 4200-20; the first solvent is a mixture of propylene glycol methyl acetate and butyl acetate in a mass ratio of 1:1;

[0139] The B component is Bayer N3390;

[0140] The C component includes the following components in percentage by mass: 28.6% modified epoxy resin, 10.5% AFCONA-407, 0.3% Deqian 6800, 1.7% second anti-settling agent, 34% modified rutile titanium dioxide, 18% filler, 7% WR Grace & Co. C500, 0.2% EFKA3777 and 9.7% second solvent; the second anti-settling agent is a mixture of SD-2 of Deqian Enterprise Co., Ltd. and Desbaron 4200-20 in a mass ratio of 1:2; the filler is a mixture of 1480 mesh ultrafine mica powder, 200nm nano zinc oxide and zinc phosphate in a mass ratio of 4:9:5; the second solvent is a mixture of petroleum xylene and butanol in a mass ratio of 7:2;

[0141] The D component includes the following components in percentage by mass: 55% of Air Products And Chemicals Inc. Sunmide 305 and 45% of a third solvent; the third solvent is a mixture of petroleum xylene, butanol and propylene glycol methyl ether acetate in a mass ratio of 6:1.5:2.5;

[0142] The modified hydroxyl acrylic resin comprises the following raw material components in mass percentage: 26% of fluorocarbon resin, 62% of hydroxyl acrylic resin, 1.8% of Momentive CoatOSil MP200, and 10.2% of propylene glycol methyl ether acetate; wherein, the fluorine content of the fluorocarbon resin is ≥35%, the solid content is 66 wt%, the hydroxyl content is 1.8 wt%, and the molecular weight is 10,500; the solid content of the hydroxyl acrylic resin is 78 wt%, the hydroxyl content is 4.2 wt%, the viscosity is 5,000 mPa·s, the molecular weight is 3,020, and the glass transition temperature is 26 °C;

[0143] The preparation method of the modified hydroxyl acrylic resin comprises the following steps:

[0144] a. Mix the weighed fluorocarbon resin, hydroxyl acrylic resin, and propylene glycol methyl ether acetate evenly to obtain a mixed resin;

[0145] b. At 70 °C, dropwise add Momentive CoatOSil MP200 to the mixed resin, control the dropping time to be 3 min, keep warm for 3 h, and stir during the heat preservation to obtain the modified hydroxyl acrylic resin;

[0146] The modified epoxy resin comprises the following raw material components in mass percentage: 77.5% of epoxy resin, 19% of flexible epoxy resin, and 3.5% of KH560; wherein, the epoxy resin is a polymer of bisphenol A and bisphenol A diglycidyl ether, the epoxy equivalent is 500, the viscosity is 8,000 mPa·s, and the solid content is 74 wt%; the flexible epoxy resin is a polymer of epichlorohydrin and polypropylene glycol, its solid content is 99.5 wt%, the epoxy equivalent is 310, and the viscosity is 60 mPa·s;

[0147] The preparation method of the modified epoxy resin comprises the following steps:

[0148] S1. Mix the weighed epoxy resin and flexible epoxy resin evenly, and keep warm at 60 °C for 0.5 h to obtain a mixed resin;

[0149] S2. At 70 °C, dropwise add the KH560 to the mixed resin, the dropping time is 5 min, stir at a rate of 500 r / min during the dropping, and then keep warm at 82 °C for 2.5 h to obtain the modified epoxy resin;

[0150] The modified rutile titanium dioxide comprises the following raw material components in mass percentage: 89% of rutile titanium dioxide, 10.4% of nano-aluminum oxide, and 0.6% of nano-yttrium oxide;

[0151] The preparation method of the modified rutile titanium dioxide comprises the following steps:

[0152] S1. Evenly mix the weighed DuPont R706, nano-alumina with a particle size of 48 nm, and nano-yttrium oxide with a particle size of 15 nm to obtain a mixed material;

[0153] S2, calcining the mixture at 1100° C. for 3 h, and grinding to obtain modified rutile titanium dioxide with a particle size of 10 μm;

[0154] This embodiment provides a method for preparing the above-mentioned durable reflective thermal insulation coating, comprising the following steps:

[0155] Step 1, weighing each component according to the mass ratio, adding the weighed AFCONA-4071, BYK-066N, Desbaron 4200-20, EFKA3777, TINUVIN-292 and TINUVIN-1130 to the modified hydroxyl acrylic resin, stirring at a rate of 600 r / min for 3 minutes, and then adding Cabot Corporation M5, stirring at a rate of 500 r / min for 3 minutes to obtain a first mixed slurry;

[0156] Step 2, adding iron chrome black and nano zinc oxide with a particle size of 50 nm to the first mixed slurry, then adding the first solvent until the viscosity is 120s, stirring at a rate of 1000r / min for 20min, and grinding to a fineness of 20μm to obtain the A component;

[0157] Step 3, mixing the component A and the component B in a mass ratio of 5.4:1 to obtain the topcoat;

[0158] Step 4, adding the AFCONA-4071, Deqian 6800, Desbaron 4200-20 and EFKA3777 to the modified epoxy resin, stirring at a rate of 700 r / min for 5 min, and then adding the Deqian Enterprise Co., Ltd. SD-2, stirring at a rate of 300 r / min for 5 min, to obtain a second mixed slurry;

[0159] Step 5, adding modified rutile titanium dioxide, filler and WR Grace & Co. C500 to the second mixed slurry, then adding the second solvent to a viscosity of 2000 mpa.s, mixing evenly, grinding to a fineness of 20 μm, to obtain the C component;

[0160] Step 6, keeping the polyamide curing agent at 60° C. for 4 hours, then adding the third solvent at 70° C., stirring at a rate of 600 r / min for 30 minutes, to obtain the D component;

[0161] Step 7: Evenly mix the component C and the component D in a mass ratio of 25:3 to obtain the primer.

[0162] Example 2

[0163] This example provides a durable reflective heat-insulating coating, including a topcoat and a primer;

[0164] The topcoat includes component A and component B, and the primer includes component C and component D;

[0165] Component A includes the following components in mass percentages: modified hydroxyl acrylic resin 55%, EFKAPX431 0.1%, TEGO Airex 931 0.5%, first anti-settling agent 1.6%, near-infrared reflective titanium dioxide 30%, nano-zinc oxide with a particle size of 100 nm 1%, LHP-95 0.2%, Eversorb93 0.9%, Eversorb80 1.4%, and first solvent 8.1%; The first anti-settling agent is a mixture of Delon Enterprise Co., Ltd. SD-2 and Delon Enterprise Co., Ltd. 202P with a mass ratio of 2:1; The first solvent is a mixture of propylene glycol methyl ether acetate and butyl acetate with a mass ratio of 1:2;

[0166] Component B is Wanhua HT-90B;

[0167] Component C includes the following components in mass percentages: modified epoxy resin 30%, EFKA-4010 0.4%, HX2080 0.5%, second anti-settling agent 1.5%, modified rutile titanium dioxide 33.5%, filler 19.5%, W.R.Grace&Co.C500 6%, DISPARLON LHP-95 0.3%, and second solvent 8.3%; The second anti-settling agent is a mixture of Delon Enterprise Co., Ltd. SD-2 and Delon Enterprise Co., Ltd. 202P with a mass ratio of 2:1; The filler is a mixture of 1520-mesh ultrafine mica powder, 100-nm nano-zinc oxide, and zinc phosphate with a mass ratio of 6:11:6; The second solvent is a mixture of petroleum xylene and butanol with a mass ratio of 7:4;

[0168] Component D includes the following components in mass percentages: Shanghai Junjiang Technology Co., Ltd. D8115-2 45% and third solvent 55%; The third solvent is a mixture of petroleum xylene, butanol, and propylene glycol methyl ether acetate with a mass ratio of 6:2.5:1.5;

[0169] The modified hydroxyl acrylic resin comprises the following raw material components by mass percentage: 26% of fluorocarbon resin, 63% of hydroxyl acrylic resin, 2% of Momentive CoatOSil MP200, and 9% of propylene glycol methyl ether acetate; the fluorocarbon resin has a fluorine content of ≥35%, a solid content of 64 wt%, a hydroxyl content of 1.9 wt%, and a molecular weight of 10300; the hydroxyl acrylic resin has a solid content of 82 wt%, a hydroxyl content of 4.1 wt%, a viscosity of 9000 mPa·s, a molecular weight of 2980, and a glass transition temperature of 24°C;

[0170] The preparation method of the modified hydroxyl acrylic resin comprises the following steps:

[0171] a. Mix the weighed fluorocarbon resin, hydroxyl acrylic resin, and propylene glycol methyl ether acetate evenly to obtain a mixed resin;

[0172] b. At 60°C, dropwise add Momentive CoatOSil MP200 to the mixed resin, control the dropping time to be 5 min, keep warm for 4 h, and stir during the heat preservation to obtain the modified hydroxyl acrylic resin;

[0173] The modified epoxy resin comprises the following raw material components by mass percentage: 78.5% of epoxy resin, 19% of flexible epoxy resin, and 2.5% of Yangzhou Lida LD-3168; the epoxy resin is a polymer of bisphenol A and bisphenol A diglycidyl ether, with an epoxy equivalent of 450, a viscosity of 12000 mPa·s, and a solid content of 76 wt%; the flexible epoxy resin is a polymer of epichlorohydrin and polypropylene glycol, with a solid content of 100 wt%, an epoxy equivalent of 330, and a viscosity of 70 mPa·s;

[0174] The preparation method of the modified epoxy resin comprises the following steps:

[0175] S1. Mix the weighed epoxy resin and flexible epoxy resin evenly, and keep warm at 50°C for 1 h to obtain a mixed resin;

[0176] S2. At 80°C, dropwise add the Yangzhou Lida LD-3168 to the mixed resin, the dropping time is 6 min, stir at a rate of 600 r / min during the dropping, and then keep warm at 78°C for 1.5 h to obtain the modified epoxy resin;

[0177] The modified rutile titanium dioxide comprises the following raw material components by mass percentage: 90% of TiONA696, 9.5% of nano-aluminum oxide with a particle size of 52 nm, and 0.5% of nano-yttrium oxide with a particle size of 7 nm;

[0178] The preparation method of the modified rutile titanium dioxide comprises the following steps:

[0179] S1. Evenly mix the weighed rutile titanium dioxide, nano-alumina and nano-yttrium oxide to obtain a mixed material;

[0180] S2, calcining the mixture at 1200° C. for 4 h, and grinding to obtain modified rutile titanium dioxide with a particle size of 20 μm;

[0181] This embodiment provides a method for preparing the above-mentioned durable reflective thermal insulation coating, comprising the following steps:

[0182] Step 1, weighing each component according to the mass ratio, adding the weighed EFKA PX4310, TEGO Airex 931, Deqian Enterprise Co., Ltd. 202P, LHP-95, Eversorb93 and Eversorb80 to the modified hydroxyl acrylic resin, stirring at a rate of 600 r / min for 3 minutes, and then adding the Deqian Enterprise Co., Ltd. SD-2, stirring at a rate of 500 r / min for 3 minutes to obtain a first mixed slurry;

[0183] Step 2, adding near-infrared reflective titanium dioxide and nano zinc oxide with a particle size of 100 nm to the first mixed slurry, then adding the first solvent until the viscosity is 100s, stirring at a rate of 1000 r / min for 20 minutes, and grinding to a fineness of 25 μm to obtain the A component;

[0184] Step 3, mixing the component A and the component B in a mass ratio of 5.6:1 to obtain the topcoat;

[0185] Step 4, adding the EFKA-4010, HX2080, Deqian Enterprise Co., Ltd. 202P and DISPARLON LHP-95 to the modified epoxy resin, stirring at a rate of 700 r / min for 5 minutes, and then adding Deqian Enterprise Co., Ltd. SD-2, stirring at a rate of 300 r / min for 5 minutes to obtain a second mixed slurry;

[0186] Step 5, adding modified rutile titanium dioxide, filler and WR Grace & Co. C500 to the second mixed slurry, then adding the second solvent to a viscosity of 3500 mpa.s, mixing evenly, and grinding to a fineness of 25 μm to obtain the C component;

[0187] Step 6, at 50° C., heat the D8115-2 of Shanghai Junjiang Technology Co., Ltd. for 2 hours, then add the third solvent at 80° C., and stir at a rate of 600 r / min for 30 minutes to obtain the D component;

[0188] Step 7: Evenly mix the component C and the component D in a mass ratio of 25:3.2 to obtain the primer.

[0189] Example 3

[0190] This embodiment provides a durable reflective heat-insulating coating, including a topcoat and a primer;

[0191] The topcoat comprises component A and component B, and the primer comprises component C and component D;

[0192] The component A comprises the following components in percentage by mass: 56% of modified hydroxy acrylic resin, 12% of AFCONA-407, 0.4% of BYK-066N, 3% of the first anti-settling agent, 20% of cobalt chrome green, 8% of nano zinc oxide with a particle size of 50 nm, 0.4% of LHP-95, 1.2% of TINUVIN-292, 2% of Eversorb80 and 7% of the first solvent; the first anti-settling agent is a mixture of Cabot Corporation M5 and Desbaron 4200-20 in a mass ratio of 1:2; the first solvent is a mixture of propylene glycol methyl acetate and butyl acetate in a mass ratio of 1:1.5;

[0193] The B component is Wanhua HT-90B;

[0194] The C component includes the following components in percentage by mass: 28.5% modified epoxy resin, 10.5% AFCONA-407, 0.4% Deqian 6800, 1.9% second anti-settling agent, 33.5% modified rutile titanium dioxide, 22% filler, 7.5% WR Grace & Co. C500, 0.5% EFKA3777 and 5.2% second solvent; the second anti-settling agent is a mixture of SD-2 of Deqian Enterprise Co., Ltd. and Desbaron 4200-20 in a mass ratio of 1:1.5; the filler is a mixture of ultrafine mica powder with a particle size of 1500 mesh, nano zinc oxide and zinc phosphate with a particle size of 150nm in a mass ratio of 5:10:6; the second solvent is a mixture of petroleum xylene and butanol in a mass ratio of 7:3;

[0195] The D component includes the following components in percentage by mass: 50% of Air Products And Chemicals Inc. Sunmide 305 and 50% of a third solvent; the third solvent is a mixture of petroleum xylene, butanol and propylene glycol methyl ether acetate in a mass ratio of 6:2:2;

[0196] The modified hydroxyl acrylic resin comprises the following raw material components in mass percentages: 26.5% of fluorocarbon resin, 62% of hydroxyl acrylic resin, 2% of Momentive CoatOSil MP200, and 9.5% of propylene glycol methyl ether acetate; the fluorocarbon resin has a fluorine content of ≥35%, a solid content of 65 wt%, a hydroxyl content of 1.9 wt%, and a molecular weight of 10400; the hydroxyl acrylic resin has a solid content of 80 wt%, a hydroxyl content of 4.1 wt%, a viscosity of 6000 mPa·s, a molecular weight of 3000, and a glass transition temperature of 25°C;

[0197] The preparation method of the modified hydroxyl acrylic resin comprises the following steps:

[0198] a. Mix the weighed fluorocarbon resin, hydroxyl acrylic resin, and propylene glycol methyl ether acetate evenly to obtain a mixed resin;

[0199] b. At 65°C, dropwise add Momentive CoatOSil MP200 to the mixed resin, control the dropping time to be 4 min, keep warm for 3.5 h, and stir during the heat preservation to obtain the modified hydroxyl acrylic resin;

[0200] The modified epoxy resin comprises the following raw material components in mass percentages: 76.5% of epoxy resin, 20% of flexible epoxy resin, and 3.5% of Yangzhou Lida LD-3168; the epoxy resin is a polymer of bisphenol A and bisphenol A diglycidyl ether, with an epoxy equivalent of 480, a viscosity of 10000 mPa·s, and a solid content of 75 wt%; the flexible epoxy resin is a polymer of epichlorohydrin and polypropylene glycol, with a solid content of 99.8 wt%, an epoxy equivalent of 320, and a viscosity of 65 mPa·s;

[0201] The preparation method of the modified epoxy resin comprises the following steps:

[0202] S1. Mix the weighed epoxy resin and flexible epoxy resin evenly, and keep warm at 55°C for 0.7 h to obtain a mixed resin;

[0203] S2. At 75°C, dropwise add Yangzhou Lida LD-3168 to the mixed resin, with a dropping time of 5.5 min, and stir at a rate of 600 r / min during the dropping, then keep warm at 80°C for 2 h to obtain the modified epoxy resin;

[0204] The modified rutile titanium dioxide comprises the following raw material components in mass percentages: 88.1% of DuPont R706, 11.5% of nano-aluminum oxide with a particle size of 50 nm, and 0.4% of nano-yttrium oxide with a particle size of 10 nm;

[0205] The preparation method of the modified rutile titanium dioxide comprises the following steps:

[0206] S1. Evenly mix the weighed rutile titanium dioxide, nano-alumina and nano-yttrium oxide to obtain a mixed material;

[0207] S2, calcining the mixture at 1150° C. for 3.5 hours, and grinding to obtain a modified rutile titanium dioxide with a particle size of 15 μm;

[0208] This embodiment provides a method for preparing the above-mentioned durable reflective thermal insulation coating, comprising the following steps:

[0209] Step 1, weighing each component according to the mass ratio, adding the weighed AFCONA-4071, BYK-066N, Desbaron 4200-20, LHP-95, TINUVIN-292 and Eversorb80 to the modified hydroxyl acrylic resin, stirring at a rate of 600 r / min for 3 minutes, and then adding the Cabot Corporation M5, stirring at a rate of 500 r / min for 3 minutes to obtain a first mixed slurry;

[0210] Step 2, adding cobalt chrome green and nano zinc oxide with a particle size of 50 nm to the first mixed slurry, then adding the first solvent until the viscosity is 100s, stirring at a rate of 1000 r / min for 20 minutes, and grinding to a fineness of 25 μm to obtain the A component;

[0211] Step 3, mixing the component A and the component B in a mass ratio of 5.5:1 to obtain the topcoat;

[0212] Step 4, adding the AFCONA-4071, Deqian 6800, Desbaron 4200-20 and EFKA3777 to the modified epoxy resin, stirring at a rate of 700 r / min for 5 min, and then adding the Deqian Enterprise Co., Ltd. SD-2, stirring at a rate of 300 r / min for 5 min, to obtain a second mixed slurry;

[0213] Step 5, adding modified rutile titanium dioxide, filler and WR Grace & Co. C500 to the second mixed slurry, then adding the second solvent to a viscosity of 3500 mpa.s, mixing evenly, and grinding to a fineness of 25 μm to obtain the C component;

[0214] Step 6, keeping Air Products And Chemicals Inc. Sunmide 305 at 55° C. for 3 hours, then adding the third solvent at 75° C., stirring at a rate of 600 r / min for 30 minutes, to obtain the D component;

[0215] Step 7: Evenly mix the component C and the component D in a mass ratio of 25:3.1 to obtain the primer.

[0216] Example 4

[0217] This embodiment provides a durable reflective heat-insulating coating, including a topcoat and a primer;

[0218] The topcoat comprises component A and component B, and the primer comprises component C and component D;

[0219] The component A comprises the following components in percentage by mass: 55.2% of modified hydroxy acrylic resin, 0.9% of AFCONA-4071, 0.4% of BYK-066N, 2.3% of the first anti-settling agent, 32% of iron chrome black, 1.5% of nano zinc oxide with a particle size of 50 nm, 0.3% of EFKA3777, 0.7% of TINUVIN-292, 1.5% of TINUVIN-1130 and 5.2% of the first solvent; the first anti-settling agent comprises 1:1 of Cabot Corporation M5 and Desbaron 4200-20; the first solvent is a mixture of propylene glycol methyl acetate and butyl acetate in a mass ratio of 1:1;

[0220] The B component is Bayer N3390;

[0221] The C component includes the following components in percentage by mass: 27.5% modified epoxy resin, 10.6% AFCONA-407, 0.2% Deqian 6800, 2.5% second anti-settling agent, 33% modified rutile titanium dioxide, 23% filler, 8% WR Grace & Co. C500, 0.3% EFKA3777 and 4.9% second solvent; the second anti-settling agent is a mixture of SD-2 of Deqian Enterprise Co., Ltd. and Desbaron 4200-20 in a mass ratio of 1:2; the filler is a mixture of 1480 mesh ultrafine mica powder, 200nm nano zinc oxide and zinc phosphate in a mass ratio of 4:9:5; the second solvent is a mixture of petroleum xylene and butanol in a mass ratio of 7:2;

[0222] The D component includes the following components in percentage by mass: 51% of Air Products And Chemicals Inc. Sunmide 305 and 49% of a third solvent; the third solvent is a mixture of petroleum xylene, butanol and propylene glycol methyl ether acetate in a mass ratio of 6:1.5:2.5;

[0223] The modified hydroxyl acrylic resin comprises the following raw material components by mass percentage: 27% of fluorocarbon resin, 63% of hydroxyl acrylic resin, 2% of Momentive CoatOSil MP200, and 8% of propylene glycol methyl ether acetate; wherein, the fluorine content of the fluorocarbon resin is ≥35%, the solid content is 66 wt%, the hydroxyl content is 1.8 wt%, and the molecular weight is 10,500; the solid content of the hydroxyl acrylic resin is 78 wt%, the hydroxyl content is 4.2 wt%, the viscosity is 5,000 mPa·s, the molecular weight is 3,020, and the glass transition temperature is 26 °C;

[0224] The preparation method of the modified hydroxyl acrylic resin comprises the following steps:

[0225] a. Mix the weighed fluorocarbon resin, hydroxyl acrylic resin, and propylene glycol methyl ether acetate evenly to obtain a mixed resin;

[0226] b. At 68 °C, dropwise add Momentive CoatOSil MP200 to the mixed resin, control the dropping time to be 5 min, keep warm for 3.5 h, and stir during the heat preservation to obtain the modified hydroxyl acrylic resin;

[0227] The modified epoxy resin comprises the following raw material components by mass percentage: 77% of epoxy resin, 19.5% of flexible epoxy resin, and 3.5% of KH560; wherein, the epoxy resin is a polymer of bisphenol A and bisphenol A diglycidyl ether, the epoxy equivalent is 500, the viscosity is 8,000 mPa·s, and the solid content is 74 wt%; the flexible epoxy resin is a polymer of epichlorohydrin and polypropylene glycol, its solid content is 99.5 wt%, the epoxy equivalent is 310, and the viscosity is 60 mPa·s;

[0228] The preparation method of the modified epoxy resin comprises the following steps:

[0229] S1. Mix the weighed epoxy resin and flexible epoxy resin evenly, and keep warm at 55 °C for 0.7 h to obtain a mixed resin;

[0230] S2. At 75 °C, dropwise add KH560 to the mixed resin, the dropping time is 5.5 min, stir at a rate of 600 r / min during the dropping, and then keep warm at 80 °C for 2 h to obtain the modified epoxy resin;

[0231] The modified rutile titanium dioxide comprises the following raw material components by mass percentage: 88% of rutile titanium dioxide, 11.4% of nano-aluminum oxide, and 0.6% of nano-yttrium oxide;

[0232] The preparation method of the modified rutile titanium dioxide comprises the following steps:

[0233] S1. Evenly mix the weighed DuPont R706, nano-alumina with a particle size of 48 nm, and nano-yttrium oxide with a particle size of 15 nm to obtain a mixed material;

[0234] S2, calcining the mixture at 1150° C. for 3.5 hours, and grinding to obtain a modified rutile titanium dioxide with a particle size of 15 μm;

[0235] This embodiment provides a method for preparing the above-mentioned durable reflective thermal insulation coating, comprising the following steps:

[0236] Step 1, adding weighed AFCONA-4071, BYK-066N, Desbaron 4200-20, EFKA3777, TINUVIN-292 and TINUVIN-1130 to the modified hydroxyl acrylic resin, stirring at a rate of 600 r / min for 3 min, then adding Cabot Corporation M5, stirring at a rate of 500 r / min for 3 min, to obtain a first mixed slurry;

[0237] Step 2, adding iron chrome black and nano zinc oxide with a particle size of 50 nm to the first mixed slurry, then adding the first solvent until the viscosity is 100s, stirring at a rate of 1000r / min for 20min, and grinding to a fineness of 25μm to obtain the A component;

[0238] Step 3, mixing the component A and the component B in a mass ratio of 5.4:1 to obtain the topcoat;

[0239] Step 4, adding the AFCONA-4071, Deqian 6800, Desibalon 4200-20 and EFKA3777 to the modified epoxy resin, stirring at a rate of 700 r / min for 5 min, and then adding SD-2 of Deqian Enterprise Co., Ltd., stirring at a rate of 300 r / min for 5 min to obtain a second mixed slurry;

[0240] Step 5, adding modified rutile titanium dioxide, filler and WR Grace & Co. C500 to the second mixed slurry, then adding the second solvent to a viscosity of 3500 mpa.s, mixing evenly, and grinding to a fineness of 25 μm to obtain the C component;

[0241] Step 6, keeping the polyamide curing agent at 55° C. for 3 hours, then adding the third solvent at 75° C., stirring at a rate of 600 r / min for 30 minutes, to obtain the D component;

[0242] Step 7: Evenly mix the component C and the component D in a mass ratio of 25:3 to obtain the primer.

[0243] Comparative Example 1

[0244] This comparative example provides a coating, which is different from Example 1 in that:

[0245] The fluorocarbon resin is replaced with an equal amount of Heimersdorf Hypomer FS-4365A;

[0246] The modified hydroxy acrylic resin comprises the following raw material components in mass percentage: Heimersdorf Hypomer FS-4365A 26%, hydroxy acrylic resin 62%, Momentive CoatOSil MP200 1.8%, and propylene glycol methyl ether acetate 10.2%;

[0247] Other components and operation steps are the same as those in Example 1.

[0248] Comparative Example 2

[0249] This comparative example provides a coating, which is different from Example 1 in that:

[0250] The hydroxy acrylic resin is replaced with an equal amount of polyester resin 650 MPA;

[0251] The modified polyester resin comprises the following raw material components in mass percentage: fluorocarbon resin 26%, 650 MPA 62%, Momentive CoatOSil MP200 1.8%, and propylene glycol methyl ether acetate 10.2%;

[0252] Other components and operation steps are the same as those in Example 1.

[0253] Comparative Example 3

[0254] This comparative example provides a coating, which is different from Example 1 in that:

[0255] The flexible epoxy resin is replaced with an equal amount of SM828;

[0256] Other components and operation steps are the same as those in Example 1.

[0257] Comparative Example 4

[0258] This comparative example provides a coating, which is different from Example 1 in that:

[0259] The nano-aluminum oxide is replaced with an equal amount of nano-silica;

[0260] Other components and operation steps are the same as those in Example 1.

[0261] Comparative Example 5

[0262] This comparative example provides a coating, which is different from Example 1 in that:

[0263] Replace yttrium trioxide nanoparticles with an equal amount of zinc oxide nanoparticles;

[0264] Other components and operation steps are the same as those in Example 1.

[0265] Comparative Example 6

[0266] This comparative example provides a coating, which is different from Example 1 in that:

[0267] Replace aluminum oxide nanoparticles with an equal amount of yttrium trioxide nanoparticles;

[0268] Other components and operation steps are the same as those in Example 1.

[0269] Comparative Example 7

[0270] This comparative example provides a coating, which is different from Example 1 in that:

[0271] Replace yttrium trioxide nanoparticles with an equal amount of aluminum oxide nanoparticles;

[0272] Other components and operation steps are the same as those in Example 1.

[0273] Comparative Example 8

[0274] This comparative example provides a coating, which is different from Example 1 in that:

[0275] Replace zinc oxide nanoparticles with a particle size of 50 nm with an equal amount of barium sulfate with a particle size of 50 nm;

[0276] Other components and operation steps are the same as those in Example 1.

[0277] Test the coatings provided in Examples 1-4 and Comparative Examples 1-8. For the single-coat test, the thickness of the topcoat is 120 μm and the thickness of the primer is 120 μm; for the composite-coat test, the thickness of the topcoat is 60 μm and the thickness of the primer is 120 μm;

[0278] The specific detection standards and detection items are as follows:

[0279] Apply the topcoat on the Q235 carbon steel plate and detect the gloss, L value, cross-cut adhesion, solar reflectance, near-infrared reflectance, and heat-insulating reflection temperature difference of the topcoat;

[0280] Refer to the standard provided in GB / T1865 to conduct an aging resistance test on the topcoat. After irradiating for 2000 h, detect the gloss, L value, color difference, cross-cut adhesion, solar reflectance, near-infrared reflectance, and heat-insulating reflection temperature difference of the topcoat;

[0281] The topcoat was placed in a 3% sodium chloride aqueous solution at 40°C and soaked for 2000 h. The appearance change of the topcoat was observed, and the cross-cut adhesion of the topcoat was detected.

[0282] The primer was applied to the Q235 carbon steel plate, and the L value, cross-cut adhesion, pull-off adhesion, solar reflectance, near-infrared reflectance, and heat-insulating reflection temperature difference of the primer were detected.

[0283] The primer was subjected to a salt spray resistance test according to the standard provided in GB / T 10125. After 2000 h of the test, the appearance change of the primer was observed, and the cross-cut adhesion, pull-off adhesion of the primer, and the corrosion depth at the scribed line after the salt spray test were detected.

[0284] The composite coating was applied to the Q235 carbon steel plate, the appearance of the composite coating was observed, and the gloss, L value, cross-cut adhesion, pull-off adhesion, solar reflectance, near-infrared reflectance, and heat-insulating reflection temperature difference of the composite coating were detected.

[0285] The composite coating was subjected to a cyclic corrosion aging test using the experimental mode 2 in the 5.6 test procedure and duration in ISO 12944-6 (72 h of ultraviolet and water exposure + 72 h of neutral salt spray experiment + 24 h of low-temperature exposure test). After 2688 h of aging, the appearance change of the composite coating was observed, and the gloss, L value, cross-cut adhesion, pull-off adhesion, corrosion depth at the scribed line after the cyclic test, solar reflectance, near-infrared reflectance, and heat-insulating reflection temperature difference of the composite coating were detected.

[0286] Specifically, the appearance was detected according to the GB / T 30789 standard, and the data were in turn: blistering, rusting, cracking, peeling conditions. The gloss was detected according to the GB / T 9754 standard, the L value was detected according to the GB 11186.2 standard, the cross-cut adhesion was detected according to the GB / T 9286 standard, the pull-off adhesion was detected according to the GB / T 5210 standard, the corrosion width at the scribed line was detected according to the GB / T 30789.8 standard, the solar reflectance and near-infrared reflectance were detected according to the method standard in Table 2 in 5.2.1 of JC / T 1040, and the heat-insulating reflection temperature difference was detected according to the method standard in 5.19 of HG / T 4341.

[0287] The specific detection results are shown in Table 1-7:

[0288] Table 1 Detection Results of Topcoat Performance

[0289]

[0290]

[0291] Table 2 Detection Results of Topcoat Performance after Aging Test

[0292]

[0293] Table 3 Performance test results after the topcoat salt water resistance test

[0294]

[0295]

[0296] Table 4 Primer performance test results

[0297]

[0298] Table 5 Primer performance test results after salt spray test

[0299]

[0300]

[0301] Table 6 Composite coating performance test results

[0302]

[0303]

[0304] Table 7 Composite coating performance test results after cyclic corrosion aging

[0305]

[0306]

[0307] As can be seen from Tables 1-7, the durable reflective heat insulation coating provided by the present invention has excellent adhesion when coated on a metal substrate, and also has excellent durability, corrosion resistance and reflective heat insulation effect.

[0308] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A durable reflective heat-insulating coating, characterized in that: Includes topcoat and primer; The component A comprises modified hydroxy acrylic resin and nano zinc oxide; The B component includes an isocyanate curing agent; The C component includes modified epoxy resin and modified rutile titanium dioxide; The D component includes a polyamide curing agent; Wherein, the modified hydroxy acrylic resin is a hydroxy acrylic resin modified by a fluorocarbon resin and a first silane coupling agent; The modified epoxy resin is a flexible epoxy resin and an epoxy resin modified by a second silane coupling agent, the epoxy equivalent of the flexible epoxy resin is 310-330, and the viscosity is 60mpa.s-70mpa.s; The modified rutile titanium dioxide is rutile titanium dioxide modified by nano-alumina and nano-yttrium trioxide.

2. The durable reflective heat-insulating coating according to claim 1, characterized in that: The component A comprises the following components in percentage by mass: 55%-58% of modified hydroxyl acrylic resin, 1%-12% of nano zinc oxide, and the remainder being the first functional material; and / or The C component comprises the following components in percentage by mass: 27%-30% of modified epoxy resin, 33%-34% of modified rutile titanium dioxide, and the remainder being a second functional material; and / or The D component comprises the following components in percentage by weight: 45%-55% of a polyamide curing agent and 45%-55% of a third solvent; and / or The modified hydroxy acrylic resin comprises the following raw material components in percentage by mass: 26%-27% of fluorocarbon resin, 62%-63% of hydroxy acrylic resin, 1.8%-2.0% of a first silane coupling agent and 8%-10.2% of propylene glycol methyl ether acetate.

3. The durable reflective heat-insulating paint according to claim 2, characterized in that: The fluorocarbon resin has a fluorine content of ≥35%, a solid content of 64wt%-66wt%, a hydroxyl content of 1.8wt%-1.9wt%, and a molecular weight of 10300-10500; and / or The hydroxy acrylic resin has a solid content of 78wt%-82wt%, a hydroxy content of 4.1wt%-4.2wt%, a viscosity of 5000mpa.s-9000mpa.s, a molecular weight of 2980-3020, and a glass transition temperature of 24°C-26°C.

4. The durable reflective heat-insulating paint according to claim 2, characterized in that: The preparation method of the modified hydroxy acrylic resin comprises the following steps: a. Evenly mix the weighed fluorocarbon resin, hydroxy acrylic resin and propylene glycol methyl ether acetate to obtain a mixed resin; b. Adding the first silane coupling agent to the mixed resin at 60° C.-70° C. and keeping the mixture warm to obtain the modified hydroxy acrylic resin.

5. The durable reflective heat-insulating paint according to claim 1, characterized in that: The modified epoxy resin comprises the following raw material components in percentage by mass: 76.5%-78.5% of epoxy resin, 19%-20% of flexible epoxy resin and 2.5%-3.5% of a second silane coupling agent.

6. The durable reflective heat-insulating paint according to claim 5, characterized in that: The epoxy resin is a polymer of bisphenol A and bisphenol A diglycidyl ether; and / or The solid content of the flexible epoxy resin is 99.5wt%-100wt%.

7. The durable reflective heat-insulating paint according to claim 6, characterized in that: The epoxy resin has an epoxy equivalent of 450-500, a viscosity of 8000mpa.s-12000mpa.s, and a solid content of 74wt%-76wt%; and / or The flexible epoxy resin is a polymer of epichlorohydrin and polypropylene glycol.

8. The durable reflective heat-insulating paint according to claim 1, characterized in that: The modified rutile titanium dioxide comprises the following raw material components in the following mass percentages: 88%-90% rutile titanium dioxide, 9.5%-11.5% nano-alumina and 0.4%-0.6% nano-yttrium oxide.

9. The durable reflective heat-insulating paint according to claim 8, characterized in that: The preparation method of the modified rutile titanium dioxide comprises the following steps: S1. Evenly mix the weighed rutile titanium dioxide, nano-alumina and nano-yttrium oxide to obtain a mixed material; S2. calcining the mixture at 1100° C.-1200° C. to obtain the modified rutile titanium dioxide.

10. A method for preparing the durable reflective heat-insulating coating according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, weighing each component according to the mass ratio, adding the weighed first dispersant, first defoamer, first anti-settling agent, first leveling agent, light stabilizer and ultraviolet light absorber to the modified hydroxy acrylic resin to obtain a first mixed slurry; Step 2, adding the infrared reflective pigment and nano zinc oxide to the first mixed slurry, then adding the first solvent until the viscosity is 100s-120s, mixing evenly, grinding, to obtain the A component; Step 3, mixing the component A and the component B evenly to obtain the topcoat; Step 4, adding the second dispersant, the second defoamer, the second anti-settling agent and the second leveling agent into the modified epoxy resin to obtain a second mixed slurry; Step 5, adding the modified rutile titanium dioxide, filler and ion exchange anticorrosive pigment to the second mixed slurry, then adding the second solvent until the viscosity is 2000mpa.s-3500mpa.s, mixing evenly, grinding, to obtain the C component; Step 6, keeping the polyamide curing agent warm at 50° C.-60° C., then adding the third solvent at 70° C.-80° C., and mixing evenly to obtain the D component; Step 7: Evenly mix the component C and the component D to obtain the primer.

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