A method for improving the performance of aerogel coatings using aqueous colorants

Abstract

The present application relates to a method for improving the performance of aerogel coatings using water-based color paste, including four steps of water-based color paste nanoparticle preparation, environmentally friendly colored water-based color paste preparation, composite phase change aerogel slurry preparation and water-based color paste addition to aerogel; by adding water-based color paste nanoparticles, environmentally friendly dispersants, adding microcapsule phase change materials in the preparation of aerogel, and adding dispersants, bark extraction and various additives in the mixing process of the last two; the water-based color paste is added to the aerogel, which provides a healthier and more environmentally friendly coating option, optimizes the brightness and durability of the coating color, and can improve the appearance quality and service life of the electric products related to water-based color paste coatings, and has a broad market prospect and application demand.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint preparation, in particular to a method for improving the performance of aerogel paint using water-based color paste. BACKGROUND

[0002] Paint is a material widely used in the construction, automotive, and home appliance industries, and it is mainly used for protecting and decorating the surface of objects. With the increasing demand for environmental protection, water-based paint has gradually replaced traditional oil-based paint due to its non-toxic and non-polluting advantages. Water-based color paste is an important component of water-based paint, which is mainly composed of pigments and dispersants, etc. By changing the proportion and type of pigments, different colored paints can be obtained. Aerogel is a new type of lightweight porous material with excellent thermal insulation performance, low thermal conductivity, and good mechanical strength. In recent years, aerogel has been widely used in paint, forming a new type of paint-aerogel paint. Aerogel paint not only has the excellent performance of aerogel, but also has the decorative and protective properties of paint.

[0003] In existing technology, water-based color paste is mainly dispersed by physical or chemical methods to form a stable suspension of pigments in water. Then, this color paste is added to the paint, and the pigments are uniformly distributed in the paint by stirring, etc., so as to change the color of the paint. Aerogel paint is formed by mixing aerogel with paint, which has good thermal insulation performance and decorative properties.

[0004] However, the existing water-based color paste often has problems such as low color concentration, insufficient hiding power, and poor light resistance during use. These problems not only affect the appearance of the paint, but also may affect the service life of the paint. In addition, the dispersibility of the existing water-based color paste in the paint is not good enough, which may cause poor flowability of the paint, affecting the construction efficiency and quality.

[0005] In addition, although aerogel has excellent performance, pure aerogel material has low strength and still faces some limitations, including production complexity, brittleness, which hinders its widespread adoption. SUMMARY

[0006] The technical purpose of the present application is to solve the problems in the background art and provide a method for improving the performance of aerogel paint using water-based color paste.

[0007] The above technical purpose of the present application is achieved by the following technical solution:

[0008] A method for improving the performance of aerogel paint using water-based color paste, comprising the following preparation steps:

[0009] Step S1: Preparation of water-based colorant nanoparticles: the raw materials for preparing the water-based colorant nanoparticles include styrene latex and environmentally friendly dispersants; the above-mentioned raw materials are uniformly dispersed by a mixing stirrer to obtain a colored water-based colorant nanoparticle slurry;

[0010] Step S2: Preparation of environmentally friendly colored water-based colorant: the water-based colorant nanoparticle slurry prepared in step S1 is uniformly bead-milled with pigment color powder and dispersants in water to prepare an environmentally friendly colored water-based colorant.

[0011] Step S3: Preparation of composite phase change aerogel slurry: the raw materials include polyvinyl alcohol resin, cellulose nanofiber dispersion and microcapsule phase change material, and the composite phase change aerogel is prepared by physical blending and freeze-drying.

[0012] Step S4: mixing the environmentally friendly colored water-based colorant prepared in step S2 with the composite phase change aerogel slurry prepared in step S3, and adding dispersants and additives to obtain the coating for improving the performance of aerogel coating by using water-based colorant.

[0013] The present application selects a suitable water-based colorant: first, an environmentally friendly, non-toxic and non-polluting water-based colorant is selected, which is composed of pigments and dispersants, etc., and has good dispersibility and stability. This water-based colorant can be used in aerogel coating to improve the color concentration, hiding power and light resistance of the coating, and the selected water-based colorant is mixed with the aerogel coating to form a new aerogel coating. In the preparation process, the components of the water-based colorant and the aerogel are optimized respectively, and raw materials with corresponding performance improvement are added. The selection and amount of these raw materials will improve the performance of the coating.

[0014] As a preferred, the raw materials for preparing the water-based colorant nanoparticles further include nano-CaCO3; the environmentally friendly dispersant is carboxymethyl cellulose; the preparation process of the water-based colorant nanoparticles in step S1 is as follows: first, the styrene latex is stirred at a speed of 450-550 rpm for 5 min; then the environmentally friendly dispersant carboxymethyl cellulose is added and continues to be stirred at the original speed for 5-10 min; then nano-CaCO3 powder is added to the above mixture and continues to be mixed for 15-35 min at a speed of 1450-1600 rpm, thereby obtaining the water-based colorant nanoparticle slurry.

[0015] As a preferred, the dispersant in step S2 is polyvinyl alcohol resin solution, and the pigment color powder is selected from one of phthalocyanine blue, phthalocyanine green, red, yellow or black; in the bead-milling process, the water-based colorant nanoparticle slurry, polyvinyl alcohol resin solution and deionized water are placed in a bead mill with 0.5-1.8 mm zirconium beads, and are uniformly dispersed by stirring at a speed of 300-1000 rpm, thereby obtaining the environmentally friendly colored water-based colorant.

[0016] The application has the advantages that in step S1, the water-based colorant nano-particle is prepared by nano-CaCO3, environment-friendly dispersant and styrene latex, and the water-based colorant nano-particle is added into the preparation of subsequent water-based colorant, and the addition of styrene latex can improve the colorimetric performance of the colorant, and the addition of CaCO3 can improve the bending toughness of the colorant.

[0017] The application has the advantages that the environment-friendly dispersant carboxymethyl cellulose is used, the nano-cellulose is a nano-level derivative of renewable biomass source, has remarkable colloidal properties in water and biocompatibility, is a very potential bio-based dispersant, and is suitable for various nano-materials.

[0018] The application has the advantages that the polyvinyl alcohol resin is added into the water-based colorant as a dispersant, the dispersibility and stock compatibility can be improved, and the addition of the polyvinyl alcohol resin can make the coloring more uniform, bright and high in color fastness.

[0019] Preferably, in the preparation of the water-based colorant nano-particle slurry, the mass fraction of the styrene latex is 75-90 parts, the mass fraction of the carboxymethyl cellulose is 5-20 parts, and the mass fraction of the nano-CaCO3 is 1-5 parts; in step S2, the mass fraction of the water-based colorant nano-particle slurry is 5-15 parts, the mass fraction of the pigment color powder is 20-70 parts, the mass fraction of the polyvinyl alcohol resin dispersant is 10-30 parts, and the rest is deionized water; the mass fraction ratio of the color powder to the dispersant in step S2 is preferably (1.8-2.4):1.

[0020] Preferably, in the preparation of the composite phase change aerogel slurry, the preparation of the microcapsule phase change material is that 2-15 parts of n-tetradecane, 5-30 parts of diisocyanate and 0.1-0.5 parts of sulfonated lignin with a mass concentration of 0.5% (m / v) are dissolved in deionized water, and the solution is uniformly stirred in a water bath at 55-65°C, then the above-mentioned mixed solution is uniformly dispersed in a centrifuge at a speed of 9000-12000 rpm to obtain n-tetradecane emulsion; the obtained n-tetradecane emulsion is dropped into ethylenediamine interface polymerization at a constant pressure, the mass fraction of ethylenediamine is 1-10 parts, and the water bath at 55-65°C is kept during the period, which is kept for more than 2 hours, finally the impurities are removed by water and ethanol filtration and dried to obtain the microcapsule phase change material.

[0021] Preferably, in step S3, the polyvinyl alcohol resin aqueous solution and the cellulose nanofiber dispersion suspension are prepared respectively, and then the microcapsule phase change material component is added; the mass fraction of the polyvinyl alcohol resin in deionized water is 10%; the mass fraction of the cellulose nanofiber dispersion suspension is 2%-5%; after mixing in the ratio of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension (0.5-1):1:1, the composite phase change aerogel slurry is obtained by freeze-drying.

[0022] The present application has the advantages that specific preparation steps and component mass fractions of microcapsule phase change material MPCM are provided, and the mass fractions and component proportions of raw materials are changed in the preparation of the coating

[0023] The present application has the advantages that the microcapsule phase change material MPCM is added to the raw material components, and the composite phase change aerogel is prepared by the freeze-drying technology, and the subsequent polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension are combined, and further preparation steps are proposed, so that the lightness of the aerogel is not affected, and the considerable melting enthalpy is retained, and excellent compressive strength and mechanical properties are also exhibited, and the aerogel in the present application can maintain almost constant energy storage performance even after 50% compression, and lays a foundation for the addition of various additives later, and is a phase change aerogel composite material with excellent low-temperature thermal insulation performance.

[0024] Preferably, in step S4, the dispersant is polyethylene glycol, the additive is bark extract, leveling agent polysiloxane, preservative isothiazolinone and its derivatives, and the binder is acrylic resin; the mass fraction of the dispersant is 1-10 parts, the mass fraction of the bark extract is 0.5-2 parts, the mass fraction of the leveling agent is 0.1-2 parts, the mass fraction of the preservative is 1-2 parts, and the mass fraction of the binder is 8-20 parts.

[0025] The present application has the advantages that the dispersant and the additive are further added to the coating, and the additive includes the leveling agent, the preservative and the binder, the flowability and the dispersibility of the coating are improved, the construction performance of the coating can be improved, and the appearance quality of the coating can be improved.

[0026] The present application has the advantages that polyethylene glycol is used as the dispersant, the polyethylene glycol is a non-ionic surfactant, is composed of repeated ethylene glycol units, and is similar in structure to a long-chain polyol, the structure endows it with excellent solubility, so that it can be well dissolved in water and most organic solvents; meanwhile, the polyethylene glycol dispersant also has excellent stability and is not easily affected by temperature and pH value changes.

[0027] The present application has the advantages that the leveling agent polysiloxane can strongly reduce the surface tension of the system, has the interface wetting performance and the rapid leveling performance, can play the roles of wetting and smoothness, is applied to the coating in the water-based system and the solvent system, has the advantages of small amount, simple operation and high efficiency.

[0028] The present application has the advantages that isothiazolinone is used as the preservative, can perform cross-linking chemical reaction with amino groups on the cell surface, inhibits the synthesis of proteins, changes the internal structure of the proteins to make them coagulate, so as to play the bactericidal performance and the preservative effect.

[0029] As preferred, the preparation process of the bark extract is as follows: the bark powder is dry ground to a size of 30-70 mesh, and the bark powder is extracted with 95% ethanol solution at a material-liquid ratio of 1:10 for 4-5 cycles to obtain the bark extract, wherein the bark can be selected from fir bark.

[0030] By using the present application, the advantages are that the adjuvant further adds the binder acrylic resin and the bark extract, the bark extract is used in combination with the acrylic resin, the addition of the bark extract as the light stabilizer can improve the light stability of the polyurethane acrylate (PUA) coating, and the light stability of the prepared coating is greatly improved.

[0031] As preferred, the mass ratio of the environment-friendly colored water-based color paste to the composite phase change aerogel slurry is 1:(8-10), the mass of the environment-friendly colored water-based color paste is 5-10 parts, and the mass of the composite phase change aerogel slurry is 60-80 parts.

[0032] By using the present application, the advantages are that the water-based color paste and the composite phase change aerogel slurry are mixed in a specific ratio and prepared with adjuvants, which can endow the coating with superior color development, light resistance and mechanical properties.

[0033] In summary, the present application has the following advantages:

[0034] 1. The water-based color paste and the aerogel are combined to prepare the coating, which can significantly improve the color concentration and hiding power of the coating, make the color of the coating more bright, and the hiding power stronger, thereby improving the decoration effect of the coating, the use of the water-based color paste can improve the flowability and dispersibility of the coating, make the coating more smooth during the construction process, and improve the construction efficiency and quality.

[0035] 2. The water-based color paste nanoparticles, i.e., styrene latex, environment-friendly dispersant and nano-CaCO3, are added to the raw material components of the water-based color paste, which can improve the color development and mechanical properties of the coating; in addition, the environment-friendly dispersant carboxymethyl cellulose and polyvinyl alcohol resin solution are used as dispersants and added to the water-based color paste, which can not only increase the flowability and dispersibility of the coating, but also ensure the environmental safety and non-pollution of the coating.

[0036] 3. By adding the microcapsule phase change material in the preparation of the aerogel, and combining the polyvinyl alcohol resin and cellulose nanofiber dispersion, the constant energy storage performance can be obtained while maintaining the light weight of the aerogel, the mechanical properties are improved, and more excellent adjuvants can be added.

[0037] 4. Various adjuvants, such as bark extract, leveling agent, preservative and binder, are added in the preparation of the aerogel, and the bark extract is used in combination with the acrylic resin binder, which not only improves the flowability, uniformity and light resistance of the coating, but also significantly improves the mechanical properties of the composite water-based color paste aerogel coating. Attached Figure Description

[0038] Figure 1 is a schematic diagram of a method for improving the performance of aerogel coatings using water-based pigments. Detailed Implementation

[0039] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0040] It should be noted that the microcapsule phase change material is prepared using the following mass fraction parameters:

[0041] Ten parts of n-tetradecane, 20 parts of diisocyanate, and 0.3 parts of sulfonated lignin with a mass concentration of 0.5% (m / v) were dissolved in deionized water and stirred evenly in a water bath at 60°C. The mixture was then dispersed evenly in a centrifuge at 10,000 rpm to obtain a n-tetradecane emulsion. The obtained n-tetradecane emulsion was then subjected to constant pressure dropwise polymerization with ethylenediamine at an interfacial concentration of 9 parts by mass. The mixture was kept in a water bath at 55-65°C for at least 2 hours. Finally, the mixture was filtered with water and ethanol to remove impurities and then dried to obtain the microcapsule phase change material.

[0042] The above process will not be described in detail in the following embodiments or comparative examples.

[0043] Example 1

[0044] Step S1: Preparation of water-based pigment nanoparticles: The raw materials for preparing the water-based pigment nanoparticles include 90 parts of styrene latex and 5 parts of environmentally friendly dispersant. First, stir the styrene latex at 450 rpm for 5 minutes; then add the environmentally friendly dispersant carboxymethyl cellulose and continue stirring at the original speed for 5 minutes; then add 5 parts of nano-CaCO3 powder to the above mixture and continue mixing for 15 minutes at 1450 rpm to obtain the water-based pigment nanoparticle slurry (the total mass parts above correspond to the water-based pigment nanoparticle slurry).

[0045] Step S2: Preparation of environmentally friendly colored water-based colorant: 5 parts of the water-based colorant nanoparticle slurry prepared in step S1, 20 parts of pigment color powder, 11 parts of polyvinyl alcohol resin solution were uniformly bead milled in water to prepare the environmentally friendly colored water-based colorant. The pigment color powder is phthalocyanine blue, and the rest is deionized water. The mass ratio of color powder to dispersant in step S2 is preferably 1.8:1. During the bead milling process, the water-based colorant nanoparticle slurry, polyvinyl alcohol resin solution and deionized water are placed in a bead mill with 0.5 mm zirconium beads, and stirred and dispersed uniformly at a speed of 300 rpm to obtain the environmentally friendly colored water-based colorant (the total mass fraction corresponds to the environmentally friendly colored water-based colorant).

[0046] Step S3: Preparation of composite phase change aerogel slurry: The raw materials include polyvinyl alcohol resin, cellulose nanofiber dispersion and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension are prepared in advance, and then the microcapsule phase change material component is added. The mass fraction of polyvinyl alcohol resin in deionized water is 10%; the mass fraction of cellulose nanofiber dispersion suspension is 2%; and the ratio of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension is 0.5:1:1. After mixing, freeze-drying is performed to obtain the composite phase change aerogel slurry.

[0047] Step S4: Mix 6 parts of the environmentally friendly colored water-based colorant prepared in step S2 with 60 parts of the composite phase change aerogel slurry prepared in step S3 by bead milling. The mass fraction ratio of the environmentally friendly colored water-based colorant to the composite phase change aerogel slurry is 1:10. Add 0.5 parts of dispersant polyethylene glycol and 0.5 parts of additive, which includes bark extract, 0.1 parts of leveling agent polysiloxane, 1 parts of preservative isothiazolinone and its derivatives, and 8 parts of adhesive acrylic resin. The rest is deionized water. A coating for improving the performance of aerogel paint using water-based colorant is obtained.

[0048] Example 2

[0049] Step S1: Preparation of water-based colorant nanoparticles: The raw materials for preparing the water-based colorant nanoparticles include 75 parts of styrene latex and 20 parts of environmentally friendly dispersant. The styrene latex is first stirred at a speed of 550 rpm for 5 minutes. Then the environmentally friendly dispersant carboxymethyl cellulose is added and stirred at the same speed for 10 minutes. Then 5 parts of nano-CaCO3 powder is added to the mixture and stirred at a speed of 1600 rpm for 35 minutes to obtain the water-based colorant nanoparticle slurry (the total mass fraction corresponds to the water-based colorant nanoparticle slurry).

[0050] Step S2: Preparation of environmentally friendly colored water-based colorant: 15 parts of water-based colorant nanoparticle slurry prepared in step S1, 70 parts of pigment color powder, and 10 parts of polyvinyl alcohol resin solution were uniformly bead milled in water to obtain an environmentally friendly colored water-based colorant. The pigment color powder was selected as phthalocyanine green. During the bead milling process, the water-based colorant nanoparticle slurry, the polyvinyl alcohol resin solution, and deionized water were placed in a bead mill with 1.8 mm zirconium beads, and stirred and dispersed uniformly at a speed of 1000 rpm to obtain the environmentally friendly colored water-based colorant (the total number of the above mass fractions corresponds to the environmentally friendly colored water-based colorant).

[0051] Step S3: Preparation of composite phase change aerogel slurry: The raw materials included polyvinyl alcohol resin, cellulose nanofiber dispersion, and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and the cellulose nanofiber dispersion suspension were prepared in advance, and then the microcapsule phase change material component was added. The mass fraction of polyvinyl alcohol resin in deionized water was 10%. The mass fraction of cellulose nanofiber dispersion suspension was 5%. After mixing the microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension at a ratio of 1:1:1, freeze-drying was performed to obtain the composite phase change aerogel slurry.

[0052] Step S4: 10 parts of environmentally friendly colored water-based colorant prepared in step S2 were mixed with 80 parts of composite phase change aerogel slurry prepared in step S3 by bead milling. The mass fraction ratio of environmentally friendly colored water-based colorant to composite phase change aerogel slurry was 1:8. Dispersant polyethylene glycol 0.5 parts and additives were added. The additives included bark extract 2 parts, leveling agent polysiloxane 2 parts, preservative isothiazolinone and its derivatives 0.5 parts, and adhesive acrylic resin 5 parts. A coating for improving the performance of aerogel paint using water-based colorant was obtained.

[0053] Example 3

[0054] Step S1: Preparation of water-based colorant nanoparticles: The raw materials for preparing the water-based colorant nanoparticles included 80 parts of styrene latex and 17 parts of environmentally friendly dispersant. The styrene latex was first stirred at a speed of 500 rpm for 5 min. Then the environmentally friendly dispersant carboxymethyl cellulose was added and continued to be stirred at the original speed for 10 min. Then 3 parts of nano-CaCO3 powder were added to the above mixture and continued to be mixed for 30 min at a speed of 1500 rpm to obtain the water-based colorant nanoparticle slurry (the total number of the above mass fractions corresponds to the water-based colorant nanoparticle slurry).

[0055] Step S2: Preparation of environmentally friendly colored water-based colorant: 10 parts of water-based colorant nanoparticle slurry prepared in step S1, 40 parts of pigment color powder, and 20 parts of polyvinyl alcohol resin solution were uniformly bead-mixed in water to prepare an environmentally friendly colored water-based colorant; the pigment color powder was phthalocyanine blue, and the rest was deionized water; the mass ratio of color powder to dispersant in step S2 was preferably 2:1; during the bead-milling process, the water-based colorant nanoparticle slurry, polyvinyl alcohol resin solution, and deionized water were placed in a bead mill with 1.0 mm zirconium beads, and stirred and dispersed uniformly at a speed of 800 rpm to obtain the environmentally friendly colored water-based colorant (the total mass fraction corresponds to the environmentally friendly colored water-based colorant).

[0056] Step S3: Preparation of composite phase change aerogel slurry: the raw materials included polyvinyl alcohol resin, cellulose nanofiber dispersion, and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension were prepared in advance, and then the microcapsule phase change material component was added. The mass fraction of polyvinyl alcohol resin in deionized water was 10%; the mass fraction of cellulose nanofiber dispersion suspension was 5%; and the ratio of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension was 0.7:1:1. After mixing, freeze-drying was performed to obtain the composite phase change aerogel slurry.

[0057] Step S4: 8 parts of environmentally friendly colored water-based colorant prepared in step S2 were mixed with 72 parts of composite phase change aerogel slurry prepared in step S3 by bead-milling. The mass fraction ratio of environmentally friendly colored water-based colorant to composite phase change aerogel slurry was 1:9, and 3 parts of dispersant polyethylene glycol and 1 part of bark extract, 0.5 parts of leveling agent polysiloxane, 1.5 parts of preservative isothiazolinone and its derivatives, and 14 parts of adhesive acrylic resin were added. A coating for improving the performance of aerogel paint using water-based colorant was obtained.

[0058] Example 4

[0059] Step S1: Preparation of water-based colorant nanoparticles: the raw materials for preparing the water-based colorant nanoparticles included 80 parts of styrene latex and 17 parts of environmentally friendly dispersant. The styrene latex was first stirred at a speed of 500 rpm for 5 min; then the environmentally friendly dispersant carboxymethyl cellulose was added and continued to be stirred at the original speed for 10 min; then 3 parts of nano-CaCO3 powder were added to the above mixture and continued to be mixed for 30 min at a speed of 1500 rpm to obtain the water-based colorant nanoparticle slurry (the total mass fraction corresponds to the water-based colorant nanoparticle slurry).

[0060] Step S2: Preparation of environmentally friendly colored water-based colorant: 10 parts of water-based colorant nanoparticle slurry prepared in step S1, 40 parts of pigment color powder, and 20 parts of polyvinyl alcohol resin solution were uniformly bead-mixed in water to prepare an environmentally friendly colored water-based colorant; the pigment color powder was yellow, and the rest was deionized water; the mass ratio of color powder to dispersant in step S2 was preferably 2:1; during the bead-milling process, the water-based colorant nanoparticle slurry, polyvinyl alcohol resin solution, and deionized water were placed in a bead mill with 1.0 mm zirconium beads, and stirred and dispersed uniformly at a speed of 800 rpm to obtain the environmentally friendly colored water-based colorant (the total mass fraction corresponds to the environmentally friendly colored water-based colorant).

[0061] Step S3: Preparation of composite phase change aerogel slurry: the raw materials included polyvinyl alcohol resin, cellulose nanofiber dispersion, and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension were prepared in advance, and then the microcapsule phase change material component was added. The mass fraction of polyvinyl alcohol resin in deionized water was 10%; the mass fraction of cellulose nanofiber dispersion suspension was 5%; and the ratio of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension was 0.7:1:1. After mixing, freeze-drying was performed to obtain the composite phase change aerogel slurry.

[0062] Step S4: 8.2 parts of environmentally friendly colored water-based colorant prepared in step S2 were mixed with 70 parts of composite phase change aerogel slurry prepared in step S3 by bead-milling. The mass fraction ratio of environmentally friendly colored water-based colorant to composite phase change aerogel slurry was 1:8.5, and dispersant polyethylene glycol and additives were added. The additives included bark extract 0.8 parts, leveling agent polysiloxane 2 parts, preservative isothiazolinone and its derivatives 2 parts, and adhesive acrylic resin 17 parts. A coating for improving the performance of aerogel paint using water-based colorant was obtained.

[0063] Example 5

[0064] Step S1: Preparation of water-based colorant nanoparticles: the raw materials for preparing the water-based colorant nanoparticles included 80 parts of styrene latex and 17 parts of environmentally friendly dispersant. The styrene latex was first stirred at a speed of 500 rpm for 5 min; then the environmentally friendly dispersant carboxymethyl cellulose was added and stirred at the original speed for 10 min; and then 3 parts of nano-CaCO3 powder were added to the mixture and mixed at a speed of 1500 rpm for 30 min to obtain the water-based colorant nanoparticle slurry (the total mass fraction corresponds to the water-based colorant nanoparticle slurry).

[0065] Step S2: Preparation of environmentally friendly colored water-based colorant: 10 parts of water-based colorant nanoparticle slurry prepared in step S1, 40 parts of pigment color powder, and 20 parts of polyvinyl alcohol resin solution were uniformly bead-mixed in water to prepare an environmentally friendly colored water-based colorant; the pigment color powder was black, and the rest was deionized water; the mass ratio of color powder to dispersant in step S2 was preferably 2:1; during the bead-milling process, the water-based colorant nanoparticle slurry, polyvinyl alcohol resin solution, and deionized water were placed in a bead mill with 1.0 mm zirconium beads, and stirred and dispersed uniformly at a speed of 800 rpm to obtain the environmentally friendly colored water-based colorant (the total mass fraction corresponds to the environmentally friendly colored water-based colorant).

[0066] Step S3: Preparation of composite phase change aerogel slurry: the raw materials included polyvinyl alcohol resin, cellulose nanofiber dispersion, and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension were prepared in advance, and then the microcapsule phase change material component was added. The mass fraction of polyvinyl alcohol resin in deionized water was 10%; the mass fraction of cellulose nanofiber dispersion suspension was 5%; and the ratio of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension was 0.7:1:1. After mixing, freeze-drying was performed to obtain the composite phase change aerogel slurry.

[0067] Step S4: 7.8 parts of environmentally friendly colored water-based colorant prepared in step S2 were mixed with 66.5 parts of composite phase change aerogel slurry prepared in step S3 by bead-milling. The mass fraction ratio of environmentally friendly colored water-based colorant to composite phase change aerogel slurry was 1:9.5, and dispersant polyethylene glycol and additives were added. The additives included bark extract 0.5 parts, leveling agent polysiloxane 0.5 parts, preservative isothiazolinone and its derivatives 1 part, and adhesive acrylic resin 14 parts. A coating for improving the performance of aerogel paint using water-based colorant was obtained.

[0068] Example 6

[0069] Step S1: Preparation of water-based colorant nanoparticles: the raw materials for preparing the water-based colorant nanoparticles included 80 parts of styrene latex and 17 parts of environmentally friendly dispersant. The styrene latex was first stirred at a speed of 500 rpm for 5 min; then the environmentally friendly dispersant carboxymethyl cellulose was added and continued to be stirred at the original speed for 10 min; and then 3 parts of nano-CaCO3 powder were added to the above mixture and continued to be mixed for 30 min at a speed of 1500 rpm to obtain the water-based colorant nanoparticle slurry (the total mass fraction corresponds to the water-based colorant nanoparticle slurry).

[0070] Step S2: The environmentally friendly colored water-based colorant was prepared by mixing 10 parts of the water-based colorant nanoparticle slurry prepared in step S1, 40 parts of pigment color powder, and 20 parts of polyvinyl alcohol resin solution in water and uniformly bead milling. The pigment color powder was phthalocyanine green, and the rest was deionized water. The mass ratio of color powder to dispersant in step S2 was preferably 2:1. During the bead milling process, the water-based colorant nanoparticle slurry, polyvinyl alcohol resin solution, and deionized water were placed in a bead mill with 1.0 mm zirconium beads, and stirred and dispersed uniformly at a speed of 800 rpm to obtain the environmentally friendly colored water-based colorant (the total mass fraction corresponds to the environmentally friendly colored water-based colorant).

[0071] Step S3: The composite phase change aerogel slurry was prepared by mixing polyvinyl alcohol resin, cellulose nanofiber dispersion, and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension were prepared in advance, and then the microcapsule phase change material component was added. The mass fraction of polyvinyl alcohol resin in deionized water was 10%. The mass fraction of cellulose nanofiber dispersion suspension was 5%. The mixture of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension was mixed at a ratio of 0.7:1:1 and freeze-dried to obtain the composite phase change aerogel slurry.

[0072] Step S4: The environmentally friendly colored water-based colorant prepared in step S2 was mixed with the composite phase change aerogel slurry prepared in step S3 by bead milling. The mass fraction ratio of the environmentally friendly colored water-based colorant to the composite phase change aerogel slurry was 1:8.3. Dispersants such as polyethylene glycol and additives such as bark extract 0.5 parts, leveling agent polysiloxane 0.3 parts, preservative isothiazolinone and its derivatives 1.2 parts, and adhesive acrylic resin 14.5 parts were added. A coating using water-based colorant to improve the performance of aerogel coating was obtained.

[0073] Comparative Example 1

[0074] Step S1: The phase change aerogel slurry was prepared by mixing polyvinyl alcohol resin, cellulose nanofiber dispersion, and microcapsule phase change material. The polyvinyl alcohol resin aqueous solution and cellulose nanofiber dispersion suspension were prepared in advance, and then the microcapsule phase change material component was added. The mass fraction of polyvinyl alcohol resin in deionized water was 10%. The mass fraction of cellulose nanofiber dispersion suspension was 5%. The mixture of microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension was mixed at a ratio of 0.7:1:1 and freeze-dried to obtain the composite phase change aerogel slurry.

[0075] Step S2: The phase change aerogel was prepared by mixing 65 parts of the phase change aerogel prepared in step S1, 20 parts of color powder, 10 parts of dispersant, and 5 parts of additive and stirring.

[0076] Comparative Example 2

[0077] Different from Comparative Example 1, the aerogel paint in the present comparative example is added with a common water-based color paste on the market, and the nano-particles and the environmentally friendly dispersant are not added in the water-based color paste.

[0078] Comparative Example 3

[0079] The present comparative example is a common aerogel paint on the market.

[0080] The products in the above examples and comparative examples are tested for hiding power by GB / T 23981.2-2023 “Determination of the hiding power of paints and varnishes”, the hiding power is the result of scattering and absorbing light by pigments, the greater the light absorbing capacity, the stronger the hiding power, the hiding power is represented by X, and the unit is g / m 2 ;

[0081] The light resistance is tested by GB-T 1865-2009 “Artificial weathering and artificial radiation exposure (filtered xenon arc radiation) of paints and varnishes”, the rating is referred to the evaluation of protective film comprehensive aging performance grade, 0-5 levels, 0 level is the best, and 5 level is the worst;

[0082] The flowability is tested by brush coating method in GB 1750-1979 (1989) “Determination of the flowability of paints”.

[0083] The test results are shown in Table 1 below:

[0084] Table 1: Test results of hiding power, light resistance and flowability

[0085]

[0086] From the test results in the above table, it can be seen that the water-based color paste aerogel paint prepared according to the experimental parameters in Example 3 has good performance, the hiding power thereof can reach 60.58 g / m 2 , the light resistance rating thereof is 0 level, i.e. the light resistance of the paint sample is excellent, and it is not easy to age, and the flowability thereof is also very good; in Examples 1-2, the raw material ratio of the water-based color paste to the aerogel is not appropriate, and the prepared paint sample is inferior to Examples 3-6; compared with Comparative Example 1, Comparative Example 2 does not add the water-based color paste according to the present application scheme in the aerogel paint, and selects a common water-based color paste on the market without adding nano-particles and dispersant, although the hiding power thereof is slightly better than that of Comparative Example 1, but the hiding power, light resistance and flowability thereof are obviously worse than those of Examples 1-6 prepared according to the present application scheme; Comparative Example 3 is more different from Examples.

Claims

1. A method of improving the performance of an aerogel coating using an aqueous colorant, characterized by, The preparation process comprises the following steps: Step S1: Preparation of water-based colorant nanoparticles: the raw materials for preparing the water-based colorant nanoparticles include styrene latex and environmentally-friendly dispersant; the above-mentioned raw materials are uniformly dispersed by a mixing stirrer to obtain a water-based colorant nanoparticle slurry; Step S2: Preparation of environmentally-friendly water-based colorant: the water-based colorant nanoparticle slurry prepared in step S1 is uniformly ground with pigment color powder and dispersant in water to obtain the environmentally-friendly water-based colorant; Step S3: Preparation of composite phase change aerogel slurry: the raw materials include polyvinyl alcohol resin, cellulose nanofiber dispersion and microcapsule phase change material, and the composite phase change aerogel is prepared by physical blending and freeze-drying; Step S4: The environmentally-friendly water-based colorant prepared in step S2 is mixed with the composite phase change aerogel slurry prepared in step S3, and dispersant and additives are added to obtain the coating for improving the performance of aerogel coating by using water-based colorant. The raw materials for preparing the water-based colorant nanoparticles further include nano-CaCO3; the environmentally-friendly dispersant is carboxymethyl cellulose; In the preparation of the water-based colorant nanoparticle slurry, the mass fraction of the styrene latex is 75-90 parts, the mass fraction of the carboxymethyl cellulose is 5-20 parts, and the mass fraction of the nano-CaCO3 is 1-5 parts; In step S2, the mass fraction of the water-based colorant nanoparticle slurry is 5-15 parts, the mass fraction of the pigment color powder is 20-70 parts, and the mass fraction of the polyvinyl alcohol resin dispersant is 10-30 parts, and the rest is deionized water; the mass fraction ratio of the color powder to the dispersant in step S2 is (1.8-2.4):1; In step S4, the dispersant is polyethylene glycol, the additives are bark extract, leveling agent polysiloxane, preservative isothiazolinone and its derivatives, and the binder is acrylic resin; the mass fraction of the dispersant is 1-10 parts, the mass fraction of the bark extract is 0.5-2 parts, the mass fraction of the leveling agent is 0.1-2 parts, the mass fraction of the preservative is 1-2 parts, and the mass fraction of the binder is 8-20 parts; The preparation process of the bark extract is as follows: the bark chips are dry ground to a size of 30-70 mesh bark powder, and the bark powder is extracted with 95% ethanol solution at a material-to-liquid ratio of 1:10 for 4-5 cycles to obtain the bark extract; The mass fraction ratio of the environmentally-friendly water-based colorant to the composite phase change aerogel slurry is 1:(8-10), the mass fraction of the environmentally-friendly water-based colorant is 5-10 parts, and the mass fraction of the composite phase change aerogel slurry is 60-80 parts.

2. The method of claim 1, wherein the method is characterized by, The preparation process of the water-based colorant nanoparticles in step S1 is as follows: the styrene latex is first stirred at a speed of 450-550 rpm for 5 min; then the environmentally-friendly dispersant carboxymethyl cellulose is added and stirred at the original speed for 5-10 min; then nano-CaCO3 powder is added to the mixture and mixed for 15-35 min at a speed of 1450-1600 rpm to obtain the water-based colorant nanoparticle slurry.

3. The method of claim 1, wherein the method is characterized by, The dispersant in the step S2 is a polyvinyl alcohol resin solution, and the pigment toner is selected from one of phthalocyanine blue, phthalocyanine green, red, yellow or black; in the bead milling process, the aqueous toner nano-particle slurry, the polyvinyl alcohol resin solution and deionized water are placed in a bead mill with 0.5-1.8 mm zirconium beads, and stirred and dispersed uniformly at a rotation speed of 300-1000 rpm, to obtain the environmentally friendly colored aqueous toner.

4. The method of claim 1, wherein the method is characterized by, In the preparation of the composite phase change aerogel slurry, the preparation of the microcapsule phase change material is as follows: 2-15 parts of n-tetradecane, 5-30 parts of diisocyanate and 0.1-0.5 parts of sulfonated lignin with a mass concentration of 0.5% (m / v) are dissolved in deionized water, and stirred uniformly in a water bath at 55-65°C, and then the mixed solution is uniformly dispersed in a centrifuge at a rotation speed of 9000-12000 rpm to obtain an n-tetradecane emulsion; the n-tetradecane emulsion is dropped into an ethylenediamine interface polymerization under constant pressure, the mass fraction of ethylenediamine is 1-10 parts, and the water bath at 55-65°C is kept during the process for more than 2 hours; finally, the impurities are removed by water and ethanol filtration, and then dried to obtain the microcapsule phase change material.

5. The method of claim 4, wherein the method is characterized by, In the step S3, the polyvinyl alcohol resin aqueous solution and the cellulose nanofiber dispersion suspension are prepared respectively, and then the microcapsule phase change material component is added; the mass fraction of the polyvinyl alcohol resin in deionized water is 10%; the mass fraction of the cellulose nanofiber dispersion suspension is 2%-5%; after mixing the microcapsule phase change material / polyvinyl alcohol resin aqueous solution / cellulose nanofiber dispersion suspension in a ratio of (0.5-1):1:1, freeze-drying is performed to obtain the composite phase change aerogel slurry.

6. An aerogel coating, characterized in that, The aqueous toner aerogel coating prepared by the method of any one of claims 1-5 has full color, is safe and environmentally friendly, significantly improves the color concentration and hiding power of the coating, and has good heat insulation and light resistance, and excellent flow dispersion when used.

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