Waterproof and heat-insulating integrated coating for closed cabin of compressed garbage truck and preparation method of waterproof and heat-insulating integrated coating

Abstract

The invention is applicable to the technical field of coating materials with special functions, and provides a waterproof and heat-insulating integrated coating for a closed cabin of a compressed garbage truck and a preparation method of the waterproof and heat-insulating integrated coating. The coating comprises POSS modified epoxy-acrylic hybrid emulsion, reactive elastic aerogel microspheres, thermal switch phase change-heat conduction hybrid filler and the like; the reaction type microspheres are subjected to supercritical CO2 compound modification, the surfaces of the reaction type microspheres have super-hydrophobic groups and polymerizable double bonds, chemical bonding can be formed between the reaction type microspheres and a resin matrix, and the vibration resistance and durability are greatly improved; the thermal switch filler is formed by packaging a phase-change material through a three-dimensional heat-conducting framework and has a temperature-triggered self-adaptive thermal management function; the stability of the emulsion and the internal stress resistance of the coating are enhanced through POSS modification; and the coating is guided to form a stable and uniform functional gradient structure through an ultrasonic-assisted stepped curing process. By means of single-layer construction, excellent waterproof performance, heat insulation performance, corrosion resistance, vibration resistance and self-adaptive heat management performance are achieved, and the method is particularly suitable for long-acting protection under severe working conditions such as a compressed garbage truck.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of special functional coating materials, and particularly relates to a waterproof and thermal insulation integrated coating for a closed cabin of a compression garbage truck and a preparation method thereof. BACKGROUND

[0002] The closed cabin of the compression garbage truck is in an extremely harsh environment of high temperature, high humidity, corrosive medium (garbage leachate), mechanical vibration and cold and hot impact for a long time, and the prior art solutions mainly have the following defects: Multi-layer structure problem: a multi-layer coating system of "anticorrosion primer + thermal insulation middle layer + waterproof topcoat" is generally used, and the system has problems of poor interlayer adhesion, easy delamination and peeling, complex construction process (requiring multi-coating and curing), long cycle, high cost and the like. The cabin body of the garbage truck using such a multi-layer coating often has problems of water ingress failure of the thermal insulation layer and peeling of the topcoat after being used for one year, and has a short maintenance cycle.

[0003] Limitations of thermal insulation materials: The traditional thermal insulation filler has limited thermal insulation efficiency, and the interface with the resin matrix is weak and is easy to fall off and fail under long-term vibration.

[0004] Static thermal insulation defect: the existing coating is static thermal insulation and cannot respond to the dramatic change of the environmental temperature. Under the summer sun, heat is still continuously accumulated and transmitted into the cabin, resulting in excessively high temperature in the cabin.

[0005] Weak interface bonding: the functional fillers (such as thermal insulation fillers and phase change material microcapsules) are usually only physically adsorbed with the resin matrix, and the interface is easy to fail under long-term vibration and cold and hot cycles, resulting in performance degradation of the coating. SUMMARY

[0006] The present application provides a waterproof and thermal insulation integrated coating for a closed cabin of a compression garbage truck, which aims to solve the above problems.

[0007] The present application is implemented as follows: a waterproof and thermal insulation integrated coating for a closed cabin of a compression garbage truck includes the following raw materials in parts by mass: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 10-25 parts, thermal switch phase change-thermal conductive hybrid filler 3-8 parts, organic montmorillonite 2-6 parts, wet dispersing agent 0.5-1.5 parts, defoaming agent 0.2-0.8 parts, film-forming aid 1-3 parts, and deionized water 10-20 parts.

[0008] Preferably, the following raw materials are included by mass parts: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 15-20 parts, thermal switch phase change-thermal conductive hybrid filler 4-7 parts, organically modified montmorillonite 3-5 parts, wetting dispersant 0.8-1.2 parts, defoamer 0.3-0.7 parts, film-forming aid 1.5-2.5 parts, deionized water 12-18 parts.

[0009] Preferably, the following raw materials are included by mass parts: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 15-20 parts, thermal switch phase change-thermal conductive hybrid filler 4-7 parts, organically modified montmorillonite 3-5 parts, wetting dispersant 0.8-1.2 parts, defoamer 0.3-0.7 parts, film-forming aid 1.5-2.5 parts, deionized water 12-18 parts.

[0010] Preferably, the wetting dispersant includes polycarboxylate type, polyether modified polysiloxane type; the defoamer includes mineral oil type, polyether modified silicone type; the film-forming aid includes alcohol ester twelve, propylene glycol methyl ether acetate.

[0011] Preferably, the POSS modified epoxy-acrylic hybrid emulsion is mixed from A component and B component at a dry basis mass ratio of 7:3: A component: POSS modified epoxy ester emulsion; prepared by reacting an epoxy ester emulsion containing siloxane side chains with octa-methyl polyhedral oligomeric silsesquioxane (OctaMethyl-POSS) at 60-70°C, with the addition amount of POSS being 3-5wt% of the dry basis mass of the epoxy ester emulsion; the component has strong adhesion after curing, is corrosion resistant, and the nano-cage structure of POSS can provide a stress release channel.

[0012] B component: fluorine-containing acrylic ester dispersion; prepared by copolymerizing dodecafluoroheptyl methacrylate and butyl acrylate at a mass ratio of (3:7)-(5:5), using allyl polyoxyethylene ether ammonium sulfate as a reactive emulsifier, with the amount being 3-5% of the total mass of monomers; the component provides hydrophobicity and low surface energy after curing.

[0013] After mixing, a stable "water-in-oil-in-water" multiple emulsion system is formed, which is tested for no delamination, flocculation, viscosity change rate <15% after 50°C accelerated storage for 30 days (equivalent to about 6 months at room temperature), and it is predicted that its room temperature storage period can reach more than 12 months.

[0014] Preferably, the preparation method of the reactive elastic aerogel microspheres is as follows: (1) Hydrolysis: mix tetraethyl orthosilicate (TEOS), ethanol, water and 0.1M hydrochloric acid at a molar ratio of 1:3:1:0.05, and hydrolyze at 40°C for 2 hours to obtain a silica sol; (2) Emulsification: The hydroxyl-terminated polybutadiene type polyurethane prepolymer (molecular weight 3000, amount 30-50% of the total mass of TEOS and the prepolymer) is dissolved in toluene, mixed with the above silica sol and 2% of the total mass of the emulsifier (Span 80) in the oil phase, and emulsified at 8000-12000 rpm for 10 minutes to form emulsion droplets with a particle size of 20-80 μm; (3) Gelation and crosslinking simultaneously: The emulsion is transferred to a reaction kettle, heated to 60°C, and 0.5% of the mass of the prepolymer of dioxane diamine (crosslinking agent) is added, and stirred for 6 hours to make the silica sol gelate and the polyurethane crosslink simultaneously, obtaining wet gel microspheres; (4) Supercritical modification: The wet gel microspheres are placed in a supercritical CO2 drying kettle, and under the conditions of a pressure of 10 MPa and a temperature of 45°C, CO2 fluid containing a mixed modifier (total concentration of 1 wt% based on the mass of supercritical CO2 fluid) with a mass ratio of 3:1 of perfluorooctyltriethoxysilane (PFOTES) and γ-methacryloyloxypropyltrimethoxysilane (KH-570) is introduced, and treated for 2 hours; PFOTES provides a super-hydrophobic surface, and KH-570 provides polymerizable double bonds, and then the pressure is slowly released to obtain elastic silica / polyurethane interpenetrating network aerogel microspheres with super-hydrophobic and reactive double bond surfaces.

[0015] Product characteristics: The particle size of the microspheres is 20-80 μm, the bulk density is 0.10-0.15 g / cm 3 , the water contact angle is ≥152°, it can withstand 30% compression deformation and fully rebound, and the surface C=C double bond density is 0.8-1.2 mmol / g as determined by iodometric method.

[0016] Preferably, the preparation method of the thermal switch phase change-thermal conductive hybrid filler is as follows: (1) Constructing a three-dimensional thermal conductive skeleton: The expanded graphite sheet (particle size 100 mesh) is placed in a tube furnace and treated at 850°C in an atmosphere of ammonia and borane ammine complex (ammonia borane) vapor (molar ratio of 4-6:1) for 1 hour, and boron nitride nanosheets (BNNS) are vertically grown on the surface and interlayer edges thereof to form a three-dimensional interconnected thermal conductive skeleton; (2) Phase change material loading and encapsulation: The above skeleton is immersed in molten eicosane (phase change temperature about 37°C) in a vacuum impregnation tank at 60°C for 2 hours, and the amount of eicosane is 30-40% of the mass of the three-dimensional thermal conductive skeleton; then methyl methacrylate (MMA) monomer (amount 20-30% of the mass of eicosane) and 1% of the mass of MMA of initiator (AIBN) are added, and the MMA is in-situ polymerized to form a polymer coating layer on the surface and pores of the skeleton under stirring at 75°C for 4 hours in a nitrogen atmosphere to prevent leakage of the phase change material, obtaining a composite filler; (3) Surface reactivity modification: the obtained composite filler is slightly oxidized in air atmosphere at 80℃ for 2 hours to generate carboxyl groups on its surface, and then reacted with 2wt% of γ-glycidoxypropyltrimethoxysilane (KH-560) in ethanol solution at 60℃ for 3 hours, and after washing and drying, a hybrid filler with surface rich in epoxy groups is obtained.

[0017] Product characteristics: the filler is in the form of irregular flakes with a size of 50-200μm, and its effective thermal conductivity is ≥5W / (m·K) below 37℃; in the phase transition interval of 37-45℃, its apparent thermal conductivity decreases to 0.5-1.0W / (m·K), and a large amount of latent heat (≥180J / g) is absorbed.

[0018] Preferably, the three-dimensional skeleton with BNNS grown on the surface obtained in step (1) is first oxidized in air at 80℃ for 2 hours, and then grafted with amino-terminated poly N-isopropyl acrylamide (PNIPAM, molecular weight 5000, low critical solution temperature LCST 30-34℃) by amidation reaction at 60℃ for 4 hours; the amount of PNIPAM is 25-30% of the three-dimensional skeleton (based on the mass of BNNS), the amidation reaction is carried out in a buffer system with pH=5.5-6.5, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) and N-hydroxysuccinimide (NHS) are used as activators, the molar ratio of EDC·HCl to carboxyl groups on the surface of the skeleton is 1.2:1, the molar ratio of NHS to EDC·HCl is 1:1, and the grafting rate of PNIPAM is controlled at 15-20wt%. The temperature-sensitive properties (LCST≈32℃) of PNIPAM can endow the skeleton with dynamic thermal conductivity behavior: at low temperature, the segments are stretched and do not affect the thermal conductivity; at high temperature, the segments shrink and aggregate, further destroying the thermal conductivity path, so that the apparent thermal conductivity at high temperature decreases to 0.3-0.5W / (m·K), and the response time is shortened.

[0019] The application also provides a preparation method of the waterproof and thermal insulation integrated compression garbage truck closed cabin coating as described above, which comprises the following steps: (1) Pre-dispersion: mix a wetting dispersant, half of deionized water and organically modified montmorillonite, and disperse at high speed for 20 minutes to form a uniform slurry; (2) Main slurry preparation: under low-speed stirring, add the above slurry, reactive elastic aerogel microspheres, thermal switch phase change-thermal conductivity hybrid filler, film forming aid and the remaining deionized water into the POSS modified epoxy-acrylic hybrid emulsion in sequence, and stir and mix for 30 minutes; (3) Defoaming: add a defoaming agent, stir at low speed for 10 minutes, and then stand for 30 minutes to defoam, to obtain a coating slurry; (4) Construction and stepwise curing: a. The slurry is single-pass sprayed on the surface of the closed cabin steel plate treated by Sa2.5 grade sand blasting, with a surface roughness Ra of 40-80 μm, and ultrasonic cleaning and drying with acetone, and the wet film thickness is controlled at 300-400 μm; b. First stage (ultrasonic-assisted infrared preheating shaping): immediately sent to a medium wave infrared drying zone equipped with an ultrasonic transducer (frequency 20 kHz, power 50 W), at 80-90℃, and ultrasonic-assisted dispersion is synchronously applied for 4 minutes; the ultrasonic cavitation effect promotes uniform dispersion of the fillers, and infrared heating promotes rapid evaporation of moisture and solvent, and initially forms a functional gradient and "locks" the filler distribution; c. Second stage (gradient temperature curing): transferred to a hot air circulating oven, and the temperature is increased from 90℃ to 125℃ at a rate of 1.5℃ / min, and kept at 125℃ for 25 minutes; this stage completes the deep crosslinking of the resin, the C=C double bond on the surface of the reactive elastic aerogel microspheres reacts with the acrylic ester segment in the resin to form a chemical bonding interface; the epoxy groups on the surface of the thermal switch hybrid filler also react with the resin to enhance the bonding force.

[0020] Compared with the prior art, the embodiments of the present application have the following beneficial effects: The reactive elastic aerogel microspheres in the waterproof and thermal insulation integrated compressed garbage truck closed cabin coating provided by the present application are firmly combined with the resin matrix through chemical bonding, improve the adhesion retention rate after vibration, and solve the problem of interface peeling in a vibrating environment.

[0021] The POSS modified hybrid emulsion has a long storage period, the ultrasonic-assisted curing process ensures uniform dispersion of the functional fillers, and the coating has good consistency in performance.

[0022] The thermal switch hybrid filler integrates rapid heat conduction, phase change heat storage, and high-temperature thermal insulation, dynamically responds to changes in environmental temperature, and significantly improves the thermal protection efficiency in extreme environments.

[0023] Through the cooperation of material design and process, a stable gradient from the "super-hydrophobic / thermal response layer" to the "main thermal insulation layer" to the "strong adhesion layer" is constructed in a single coating; the coating has high adhesion, high hydrophobicity, high efficient thermal insulation, excellent corrosion resistance and cold-thermal impact resistance, and has a long service life and excellent comprehensive performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a preparation method flow chart of the waterproof and thermal insulation integrated compressed garbage truck closed cabin coating provided by the present application.

[0025] Fig. 2 is a preparation method flow chart of the reactive elastic aerogel microspheres provided by the present application.

[0026] Fig. 3This is a flowchart of the preparation method of the thermally switching phase change-thermal conductive hybrid filler provided by the present invention. Detailed Implementation

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] Example 1 This invention provides a waterproof and heat-insulating integrated sealed compartment coating for a compressed garbage truck, comprising the following raw materials in parts by weight: 100 parts of POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%), 18 parts of reactive elastic aerogel microspheres, 5 parts of thermally switching phase change-thermal conductive hybrid filler, 4 parts of organomodified montmorillonite, 1 part of wetting and dispersing agent, 0.5 parts of defoamer, 2 parts of film-forming aid, and 15 parts of deionized water. Figs. 1-3 As shown, the preparation method of the waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating includes the following steps: (1) Pre-dispersion: Mix the wetting and dispersing agent, half of the deionized water and the organic montmorillonite, and disperse at high speed for 20 minutes until a uniform slurry is formed; (2) Preparation of main slurry: Under low speed stirring, add the above slurry, reactive elastic aerogel microspheres, thermal switch phase change-thermal conductive hybrid filler, film forming aid and remaining deionized water to the POSS modified epoxy-acrylic hybrid emulsion in sequence, and stir and mix for 30 minutes. (3) Defoaming: Add defoamer, stir at low speed for 10 minutes, and let stand for 30 minutes to defoam, to obtain coating slurry; (4) Construction and stepped curing: a. The slurry is sprayed in a single pass onto the surface of the sealed chamber steel plate, which has been sandblasted to Sa2.5 grade, with a surface roughness Ra of 40-80μm, and has been ultrasonically cleaned with acetone and dried. The wet film thickness is about 350μm. b. First stage (ultrasound-assisted infrared preheating setting): immediately sent to the medium wave infrared drying zone equipped with an ultrasonic transducer (frequency 20 kHz, power 50 W), at 80-90℃, and simultaneously applied ultrasound-assisted dispersion for 4 minutes; c. Second stage (gradient temperature curing): transferred to the hot air circulating drying channel, and heated from 90℃ to 125℃ at a rate of 1.5℃ / min, and kept at 125℃ for 25 minutes; naturally cooled, and the obtained coating dry film thickness was controlled at 150-180μm.

[0030] The wetting dispersant includes polycarboxylate type and polyether-modified polysiloxane type; the defoaming agent includes mineral oil type and polyether-modified silicone type; and the film-forming aid includes alcohol ester twelve and propylene glycol methyl ether acetate.

[0031] In this embodiment, the preparation method of the POSS-modified epoxy-acrylic hybrid emulsion is as follows: A component (POSS-modified epoxy ester emulsion): the epoxy ester emulsion containing siloxane side chains (solid content 50%) was mixed with octa-methyl polyhedral oligomeric silsesquioxane (OctaMethyl-POSS), and the POSS addition amount was 4wt% of the epoxy ester solid content. The mixture was stirred and reacted at 65℃ for 3 hours to obtain the POSS-modified epoxy ester emulsion; B component (fluorine-containing acrylic ester dispersion): dodecafluoroheptyl methacrylate and butyl acrylate were mixed in a mass ratio of 4:6, 4% of the total monomer mass of allyl polyoxyethylene ether ammonium sulfate (reactive emulsifier) and an appropriate amount of deionized water were added, and emulsion polymerization was carried out at 80℃ to obtain a fluorine-containing acrylic ester dispersion with a solid content of 50%; Hybrid emulsion: the A component and the B component were mixed in a dry mass ratio of 7:3, and stirred at a moderate shear rate for 30 minutes to form a stable "water-in-oil-in-water" multiple emulsion, which was recorded as emulsion M.

[0032] In this embodiment, the preparation method of the reactive elastic aerogel microspheres is as follows: (1) Hydrolysis: tetraethyl orthosilicate (TEOS), ethanol, water and 0.1M hydrochloric acid were mixed in a molar ratio of 1:3:1:0.05, and stirred and hydrolyzed at 40℃ for 2 hours to obtain a silica sol; (2) Emulsification: 40% of the total mass of TEOS and the prepolymer (molecular weight 3000) of hydroxyl-terminated polybutadiene type polyurethane prepolymer was dissolved in toluene, and mixed with the above-mentioned silica sol and 2% of Span 80 in the total mass of the oil phase. The emulsion droplets with a particle size of 20-80μm were formed by high-speed shearing emulsification at 10000rpm for 10 minutes; (3) Synchronization gel and crosslinking: the emulsion is transferred to a reaction kettle, heated to 60℃, 0.5% of dioxane diamine (crosslinking agent) is added, and stirring is reacted for 6 hours to obtain a wet gel microsphere; (4) Supercritical complex modification: the wet gel microspheres are placed in a supercritical CO2 drying kettle, under the condition of 10 MPa, 45℃, CO2 fluid containing mixed modifier (total concentration 1wt%, based on the mass of CO2 fluid) of perfluorooctyltriethoxysilane (PFOTES) and gamma-methacryloxypropyltrimethoxysilane (KH-570) with a mass ratio of 3:1 is introduced, and treated for 2 hours; after slow pressure relief, a reactive elastic aerogel microsphere is obtained, denoted as filler A; its water contact angle is ≥152°, and it can withstand 30% compression deformation and rebound.

[0033] In this embodiment, the preparation method of the thermal switch phase change-thermal conductive hybrid filler is as follows: (1) Constructing a three-dimensional thermal conductive skeleton: expandable graphite sheets (100 mesh) are placed in a tube furnace and treated at 850℃ under an atmosphere of ammonia and ammonia borane vapor (molar ratio 5:1) for 1 hour to vertically grow boron nitride nanosheets on the surface, forming a three-dimensional skeleton; (2) Phase change material loading and encapsulation: the skeleton is vacuum impregnated with melted eicosane (amounting to 35% of the mass of the skeleton) at 60℃ for 2 hours; methyl methacrylate monomer (amounting to 25% of the mass of eicosane) and AIBN initiator (1% of the mass of MMA) are added, and polymerization is carried out at 75℃ under N2 protection for 4 hours; (3) Surface reactivity modification: the obtained filler is oxidized in air at 80℃ for 2 hours, and then reacted with 2wt% KH-560 ethanol solution at 60℃ for 3 hours, washed and dried to obtain filler B1.

[0034] Product characteristics: the filler is irregularly flaky, with a size of 50-200μm, and its effective thermal conductivity is ≥5W / (m·K) below 37℃; in the phase change interval of 37-45℃, its apparent thermal conductivity decreases to 0.5-1.0W / (m·K), and a large amount of latent heat (≥180J / g) is absorbed.

[0035] Example 2 The difference between this embodiment and example 1 is that the present embodiment provides a waterproof and thermal insulation integrated compression garbage truck closed cabin coating, which comprises the following raw materials in parts by mass: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 10 parts, thermal switch phase change-thermal conductive hybrid filler 3 parts, organic montmorillonite 2 parts, wetting dispersant 0.5 parts, defoaming agent 0.2 parts, film forming aid 1 part, and deionized water 10 parts.

[0036] Example 3 The embodiment of the present application is different from example 1 in that the embodiment of the present application provides a waterproof and thermal insulation integrated compressed garbage truck closed cabin coating, which comprises the following raw materials in parts by mass: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 15 parts, thermal switch phase change-thermal conductive hybrid filler 4 parts, organic montmorillonite 3 parts, wetting dispersant 0.8 parts, defoaming agent 0.3 parts, film forming aid 1.5 parts, deionized water 12 parts.

[0037] Example 4 The embodiment of the present application is different from example 1 in that the embodiment of the present application provides a waterproof and thermal insulation integrated compressed garbage truck closed cabin coating, which comprises the following raw materials in parts by mass: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 20 parts, thermal switch phase change-thermal conductive hybrid filler 7 parts, organic montmorillonite 5 parts, wetting dispersant 1.2 parts, defoaming agent 0.7 parts, film forming aid 2.5 parts, deionized water 18 parts.

[0038] Example 5 The embodiment of the present application is different from example 1 in that the embodiment of the present application provides a waterproof and thermal insulation integrated compressed garbage truck closed cabin coating, which comprises the following raw materials in parts by mass: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 25 parts, thermal switch phase change-thermal conductive hybrid filler 8 parts, organic montmorillonite 6 parts, wetting dispersant 1.5 parts, defoaming agent 0.8 parts, film forming aid 3 parts, deionized water 20 parts.

[0039] Example 6 The embodiment of the present application is different from example 1 in that the embodiment of the present application provides a waterproof and thermal insulation integrated compressed garbage truck closed cabin coating, which comprises the following raw materials in parts by mass: POSS modified epoxy-acrylic hybrid emulsion (solid content 48%-52%) 100 parts, reactive elastic aerogel microspheres 25 parts, thermal switch phase change-thermal conductive hybrid filler 8 parts, organic montmorillonite 6 parts, wetting dispersant 1.5 parts, defoaming agent 0.8 parts, film forming aid 3 parts, deionized water 20 parts.

[0040] Comparative example 1: replace the "filler A" in example 3 with an equal amount of ordinary elastic aerogel microspheres which are only hydrophobically modified with PFOTES (without KH-570), and the rest of the formulation and process remain unchanged.

[0041] Comparative example 2: replace the "filler B1" in example 3 with an equal amount of commercially available paraffin phase change microcapsules, and the rest of the formulation and process remain unchanged.

[0042] Comparative Example 3: The preparation process was cancelled ultrasonic assistance, only 85℃ infrared preheating for 4 minutes, the rest was the same as Example 3.

[0043] Comparative Example 4: The curing process was changed to traditional constant temperature curing: directly baked at 125℃ for 30 minutes after spraying, the rest was the same as Example 3.

[0044] Comparative Example 5 (simulation of prior art): A three-layer coating system was used; the first layer was sprayed with an epoxy zinc-rich primer (dry film 50μm), cured at room temperature for 24h; the second layer was sprayed with a commercially available acrylic heat insulation coating (dry film 150μm), cured at 80℃ for 30min; the third layer was sprayed with a fluorocarbon topcoat (dry film 50μm), cured at room temperature for 72h, and the total dry film thickness of the coating was about 250μm.

[0045] Performance tests were conducted on all coating samples of Examples 1-6 and Comparative Examples 1-5 The test methods were as follows: the adhesion test of Comparative Example 5 (multi-layer system) was interlayer adhesion, the test method referred to GB / T 9286, and after gridding, the interfacial peeling of the primer-middle layer and middle layer-topcoat was observed, and the level in the table was the worst interlayer adhesion evaluation; the rest of the examples / comparative examples were substrate-coating adhesion tests; flexibility (GB / T 1731 shaft bar bending); impact resistance (GB / T 1732, positive impact); thermal conductivity (GB / T 10295 heat flow meter method, 25℃); steady-state temperature difference (the sample was placed on a 80℃ hot table, and the back center stable temperature was measured with a thermocouple to calculate ΔT); dynamic temperature rise (a 500W iodine tungsten lamp was vertically irradiated 30cm away from the sample for 30 minutes, and the back center maximum temperature rise was recorded with an infrared thermal imager); water contact angle (static drop method); salt water resistance (3% NaCl solution immersion, GB / T 9274); vibration durability (frequency 30Hz, amplitude 1mm, after vertical vibration for 72h, the adhesion was retested and the retention rate was calculated); cold and hot cycle (-40℃ for 2h, 80℃ for 2h as one cycle), and the results were as follows Table 1: The present application prepares a single-coat integrated functional coating with excellent performance through the synergistic effect of reactive elastic aerogel microspheres, thermal switch phase change-thermal conductive hybrid fillers, "POSS modified hybrid emulsion", and ultrasonic assisted step curing process.

[0046] It should be noted that, for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0047] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the protection scope of the application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still combine, add or delete or make other adjustments to the features of the embodiments of the present application according to the circumstances without conflict and without creative labor, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence. These technical solutions also belong to the scope of protection of the present application.

Claims

1. A waterproof and heat-insulating integrated sealed compartment coating for a compressed garbage truck, characterized in that, The raw materials include the following by weight: 100 parts of POSS modified epoxy-acrylic hybrid emulsion with a solid content of 48%-52%, 10-25 parts of reactive elastic aerogel microspheres, 3-8 parts of thermally switching phase change-thermal conductive hybrid filler, 2-6 parts of organomodified montmorillonite, 0.5-1.5 parts of wetting and dispersing agent, 0.2-0.8 parts of defoamer, 1-3 parts of film-forming aid, and 10-20 parts of deionized water.

2. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 1, characterized in that, The raw materials include the following by weight: 100 parts of POSS modified epoxy-acrylic hybrid emulsion, 15-20 parts of reactive elastic aerogel microspheres, 4-7 parts of thermally switching phase change-thermal conductive hybrid filler, 3-5 parts of organomodified montmorillonite, 0.8-1.2 parts of wetting and dispersing agent, 0.3-0.7 parts of defoamer, 1.5-2.5 parts of film-forming aid, and 12-18 parts of deionized water.

3. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 1, characterized in that, The raw materials include the following by weight: 100 parts of POSS modified epoxy-acrylic hybrid emulsion, 18 parts of reactive elastic aerogel microspheres, 5 parts of thermally switching phase change-thermal conductive hybrid filler, 4 parts of organic montmorillonite, 1 part of wetting and dispersing agent, 0.5 parts of defoamer, 2 parts of film-forming aid, and 15 parts of deionized water.

4. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 1, characterized in that, The reactive elastic aerogel microspheres are silica / polyurethane interpenetrating network microspheres with surfaces modified by a compounding of perfluorooctyltriethoxysilane and γ-methacryloyloxypropyltrimethoxysilane in a mass ratio of 2-4:

1. The surface C=C double bond density of the microspheres is 0.8-1.2 mmol / g.

5. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 4, characterized in that, The reactive elastic aerogel microspheres are prepared by a method comprising the following steps: (1) A mixture of tetraethyl orthosilicate, ethanol, water and 0.1M hydrochloric acid was hydrolyzed to obtain silica sol; (2) Emulsify the polyurethane prepolymer solution with the silica sol to form emulsion droplets; (3) The silica sol in the emulsion droplets is gelled and crosslinked with polyurethane to obtain wet gel microspheres; (4) The wet gel microspheres were treated with a mixed modifier containing perfluorooctyltriethoxysilane and γ-methacryloxypropyltrimethoxysilane under supercritical CO2 conditions and then dried.

6. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 1, characterized in that, The thermally switching phase change-thermal conductive hybrid filler comprises a three-dimensional thermally conductive framework consisting of expanded graphite and boron nitride nanosheets grown perpendicularly on its surface. The pores of the framework encapsulate the phase change material eicosane, and the surface has a polymer coating layer and epoxy group modification.

7. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 6, characterized in that, The thermally switching phase change-thermal conductive hybrid filler is prepared by a method comprising the following steps: (1) Constructing a three-dimensional thermally conductive framework: Expanded graphite sheets were placed in a tube furnace and treated at 850°C in an atmosphere of ammonia and borane ammonia complex vapor for 1 hour. Boron nitride nanosheets were vertically grown on the surface and between the layers to form a three-dimensional interconnected thermally conductive framework. (2) Phase change material loading and encapsulation: The above skeleton and molten eicosane were impregnated in a vacuum impregnation tank at 60°C for 2 hours; then methyl methacrylate monomer and initiator were added, and the mixture was stirred and polymerized at 75°C for 4 hours under nitrogen protection to obtain composite filler; (3) Surface reactive modification: The obtained composite filler was lightly oxidized in an air atmosphere at 80°C for 2 hours to generate carboxyl groups on its surface. Then it was reacted with an ethanol solution of 2wt% γ-glycidyl etheroxypropyltrimethoxysilane at 60°C for 3 hours. After washing and drying, a hybrid filler with epoxy groups on its surface was obtained.

8. The waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 1, characterized in that, The POSS-modified epoxy-acrylic hybrid emulsion is prepared by mixing polyhedral oligomeric silsesquioxane (POSS) modified epoxy ester emulsion and fluorinated acrylate dispersion at a dry basis mass ratio of 7:

3. The polyhedral oligomeric silsesquioxane is octamethyl polyhedral oligomeric silsesquioxane, and its addition amount is 3-5 wt% of the dry basis mass of the epoxy ester emulsion.

9. The method for preparing the waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in any one of claims 1-8, characterized in that, Includes the following steps: (1) Mix and disperse the wetting and dispersing agent, a portion of deionized water and organic montmorillonite to obtain a pre-slurry; (2) Add pre-slurry, reactive elastic aerogel microspheres, thermal switch hybrid filler, film-forming aid and remaining deionized water to POSS modified epoxy-acrylic hybrid emulsion in sequence, and stir to mix; (3) Add defoamer to defoam and obtain coating slurry after defoaming; (4) The slurry is sprayed onto the substrate and cured by ultrasonic-assisted infrared preheating and gradient temperature rise.

10. The method for preparing the waterproof and heat-insulating integrated compressed garbage truck sealed compartment coating as described in claim 9, characterized in that, The ultrasonic-assisted infrared preheating in step (4) is as follows: at 80-90℃, ultrasonic treatment with a frequency of 20kHz and a power of 50W is applied simultaneously for 4 minutes; the gradient heating and curing is as follows: the temperature is increased from 90℃ to 125℃ at a rate of 1-2℃ / min, and then kept at 125℃ for 20-30 minutes.

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