Fireproof coating for packaging aerogel felt, and preparation method therefor

Abstract

A fireproof coating for packaging aerogel felt, and a preparation method therefor. The fireproof coating comprises the following components in parts by weight: 30-50 parts of a water-based resin, 0-10 parts of a water-based color paste, 20-50 parts of a filler slurry, 8-30 parts of a flame retardant, 0-20 parts of glass beads, 0.1-2 parts of a pH regulator, 0.1-4 parts of an auxiliary agent and 0-20 parts of water. By means of using the specific water-based resin and combining same with the specific flame retardant, a packaging coating for aerogel felt and having fireproof performance can be prepared. Upon testing, the fireproof grade of the coating can be as high as 4-5 grade, and the flexibility thereof allows same to bend 180° without cracking.

Description

A fireproof coating for aerogel blanket packaging and a preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a packaging coating and a preparation method thereof, and especially to a fireproof coating for aerogel blanket packaging and a preparation method thereof. BACKGROUND

[0002] With the rapid development of new energy vehicles, the safety of the power batteries used therein has attracted more and more attention, especially the risk of self-ignition causing high-temperature fire. Aerogel blanket is considered to be an ideal thermal insulation material for future new energy vehicle power batteries due to its excellent thermal insulation performance, but it has the problem of powder falling. The volatilized aerogel powder not only affects the thermal insulation properties of the aerogel blanket, but also seriously endangers human health. Therefore, it is necessary to carry out packaging protection to reduce the safety risk of the battery. The current packaging materials are basically prepared from high molecular materials, which are difficult to achieve fireproof performance. According to the draft of GB 38031 Safety Requirements for Power Storage Batteries for Electric Vehicles, a thermal event alarm signal should be provided 5 minutes before the battery pack or system causes a dangerous situation in the passenger compartment due to the thermal diffusion of a single battery thermal runaway. This directly requires aerogel blanket and aerogel packaging materials.

[0003] In the previous research of the applicant team, an environmentally friendly flame-retardant coating for aerogel packaging was prepared by using a resin dispersion with high tensile strength and high elongation at break, and a combination of filler slurry, flame retardant and other additives. The prepared coating has a flame retardant level of UL94 V0, a flexibility of 180° bending without cracking, and a shear strength of more than 0.8 MPa (see patent document CN118029170A). However, the coating cannot meet the fireproof performance requirements. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a fireproof coating for aerogel blanket packaging and a preparation method thereof.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a fireproof coating for aerogel blanket packaging, comprising the following components by weight:

[0007] As a preferred solution, the water-based resin comprises at least one of ethylene vinyl acetate copolymer (EVA) emulsion, ethylene-co-acrylic acid copolymer (EAA) dispersion, and ethylene-co-methacrylic acid copolymer (EMAA) dispersion.

[0008] As a preferred solution, the aqueous resin is any one of an ethylene-vinyl acetate copolymer emulsion, an ethylene-co-acrylic acid copolymer dispersion, an ethylene-co-methacrylic acid copolymer dispersion; or

[0009] The aqueous resin is a combination of the ethylene-co-acrylic acid copolymer dispersion and / or the ethylene-co-methacrylic acid copolymer dispersion and the ethylene-vinyl acetate copolymer emulsion.

[0010] As a further preferred solution, the aqueous resin is a combination of the ethylene-co-acrylic acid copolymer dispersion and / or the ethylene-co-methacrylic acid copolymer dispersion and the ethylene-vinyl acetate copolymer emulsion. Specifically, the aqueous resin is a combination of the ethylene-co-acrylic acid copolymer dispersion and the ethylene-vinyl acetate copolymer emulsion, or a combination of the ethylene-co-methacrylic acid copolymer dispersion and the ethylene-vinyl acetate copolymer emulsion, or a combination of the ethylene-co-acrylic acid copolymer dispersion, the ethylene-co-methacrylic acid copolymer dispersion and the ethylene-vinyl acetate copolymer emulsion.

[0011] As a preferred solution, the ethylene-vinyl acetate copolymer emulsion has a glass transition temperature Tg of 20℃ or lower, and a molar ratio of ethylene to vinyl acetate of 3:7 or lower. More preferably, the glass transition temperature Tg is 5℃ or lower, and the proportion of vinyl acetate is 3:7-1:9.

[0012] As a preferred solution, in the ethylene-co-acrylic acid copolymer dispersion, the content of the ethylene-co-acrylic acid copolymer is 1-10wt%, and specifically, the ethylene-co-acrylic acid copolymer is prepared by mixing the ethylene-co-acrylic acid copolymer, water and NaOH in a mass ratio of 1-10:89-98:1.

[0013] As a preferred solution, in the ethylene-co-methacrylic acid copolymer dispersion, the content of the ethylene-co-methacrylic acid copolymer is 1-2wt%, and specifically, the ethylene-co-methacrylic acid copolymer is prepared by mixing the ethylene-co-methacrylic acid copolymer, water and NaOH in a ratio of 1-2:94-95:4.

[0014] As a preferred solution, in the ethylene-co-acrylic acid copolymer, the content of acrylic acid is greater than or equal to 20wt%. In the preliminary experiments of the present application, it is found that if the content of acrylic acid in the ethylene-co-acrylic acid copolymer is too low, it will not be dissolved, and thus cannot be applied to the fireproof coating of the present application.

[0015] As a preferred solution, the content of methacrylic acid in the ethylene-co-methacrylic acid copolymer is greater than or equal to 25wt%. In the previous experiments of the present application, it is found that if the content of methacrylic acid in the ethylene-co-acrylic acid copolymer is too low, it will lead to its inability to dissolve, so it cannot be applied to the fireproof coating of the present application.

[0016] As a preferred solution, the weight ratio of the ethylene-co-acrylic acid copolymer dispersion and / or ethylene-co-methacrylic acid copolymer dispersion to the ethylene-vinyl acetate copolymer emulsion is 1:2-2:1. Specifically, the weight ratio of the ethylene-co-acrylic acid copolymer dispersion to the ethylene-vinyl acetate copolymer emulsion is 1:2-2:1, or the weight ratio of the ethylene-co-methacrylic acid copolymer dispersion to the ethylene-vinyl acetate copolymer emulsion is 1:2-2:1, or the total weight of the ethylene-co-acrylic acid copolymer dispersion and the ethylene-co-methacrylic acid copolymer dispersion to the weight of the ethylene-vinyl acetate copolymer emulsion is 1:2-2:1.

[0017] As a preferred solution, the weight ratio of the ethylene-co-methacrylic acid copolymer dispersion to the ethylene-vinyl acetate emulsion copolymer is 1:2-2:1.

[0018] As a preferred solution, the weight fraction of the glass microbeads is 10-20 parts. If the content of the glass microbeads is too high, it will cause the coating to be unable to be prepared due to the high water absorption of the microbeads.

[0019] As a preferred solution, the water-based color paste includes at least one of water-based black paste, water-based iron red paste, water-based yellow paste, water-based blue paste, water-based purple paste, and water-based white paste.

[0020] As a preferred solution, the filler paste includes the following components in the following weight fractions:

[0021] As a preferred solution, the pigment is selected from at least one of barium sulfate, talc, and titanium dioxide.

[0022] As a preferred solution, the defoaming agent is selected from at least one of mineral oil-based defoaming agents and modified polyether-modified silicones.

[0023] As a preferred solution, the matting powder is selected from at least one of E1011, Tego OK520, C906.

[0024] As a preferred solution, the dispersant is selected from non-ionic wet dispersants.

[0025] As a preferred solution, the color filler comprises the following weight fractions of each raw material component: 0-35 parts of barium sulfate, 0-40 parts of talc; 0-70 parts of titanium dioxide; and the content of barium sulfate, talc, titanium dioxide is not 0 at the same time.

[0026] As a preferred solution, the defoaming agent is selected from at least one of BYK011, BYK032, BYK028, Tego Airex 902W.

[0027] As a preferred solution, the dispersing agent is selected from at least one of Tego Dispers 760W, BYK190.

[0028] As a preferred solution, the preparation method of the filler paste comprises the following steps: weighing the color filler, matting powder, defoaming agent, dispersing agent and water in the proportion of parts by weight into a grinder, and grinding and dispersing to prepare the filler paste.

[0029] As a preferred solution, the flame retardant is selected from at least one of alkyl phosphate, nitrogen-phosphorus composite flame retardant.

[0030] As a further preferred solution, the flame retardant is selected from nitrogen-phosphorus composite flame retardant. More preferably, the flame retardant is at least one of melamine type nitrogen-phosphorus composite flame retardant, ammonium polyphosphate type nitrogen-phosphorus composite flame retardant.

[0031] As a preferred solution, the pH regulator is selected from at least one of dimethyl ethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine.

[0032] As a preferred solution, the auxiliary agent comprises at least one of defoaming agent, wet dispersing agent, rheological auxiliary agent.

[0033] As a preferred solution, the defoaming agent is selected from at least one of mineral oil defoaming agent, modified polyether modified siloxane;

[0034] As a preferred solution, the wet dispersing agent is selected from polyether modified siloxane.

[0035] As a preferred solution, the rheological auxiliary agent is selected from at least one of BYK Laponite-RDS, RHEOLATE 299, ASE60, HV30.

[0036] As a preferred solution, the defoaming agent is selected from at least one of BYK011, BYK032, BYK028, Tego 902W;

[0037] As a preferred solution, the wet dispersing agent is selected from Tego-270.

[0038] In a second aspect, the present application provides a preparation method of the fireproof coating for aerogel blanket packaging, comprising the following steps:

[0039] A, the water-based resin, additives and water are weighed and mixed, and a high-shear water-based base is prepared by high-speed dispersion;

[0040] B, the weighed water-based color paste, filler paste, glass microbeads and organic flame retardant are added to the high-shear water-based base prepared in step A, and high-speed dispersion is carried out, and then a pH regulator is added to control the pH at 8.0-8.5, thereby obtaining the fireproof coating for aerogel blanket packaging.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] 1) The specific water-based resin is used in the present application, combined with a specific flame retardant, to prepare the packaging coating for aerogel blanket with fireproof performance. The fireproof grade can reach 1-5 levels after testing.

[0043] 2) The present application further uses the compounding of EAA and / or EMAA with EVA, and adds a certain amount of glass microbeads, so that the packaging coating for aerogel blanket prepared can have both fireproof performance and flexibility. The fireproof grade can reach 4-5 levels, and the flexibility can reach 180° bending without cracking. DETAILED DESCRIPTION

[0044] The present application will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These all belong to the protection scope of the present application.

[0045] The words "preferred", "preferably", "more preferably" and the like in the present application refer to the embodiments of the present application which can provide certain beneficial effects in certain cases. However, other embodiments can also be preferred in the same or other cases. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present application.

[0046] It should be understood that, except in any operational instance or otherwise indicated, all figures representing the amounts of ingredients used, for example, in the specification and claims, should be understood to be modified in all cases by the term "about". Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximations varying with the desired performance to be obtained according to the invention. It is not at all an attempt to limit the application of the doctrine of equivalents to the scope of the claims; each numerical parameter should be interpreted at least according to the number of significant figures reported and by applying ordinary rounding techniques.

[0047] Although the numerical ranges and parameters illustrating the broad scope of the invention are approximate, the values ​​listed in the specific examples are reported as precisely as possible. However, any numerical value inherently contains some error that is necessarily caused by the standard deviation found in their respective test measurements.

[0048] In the following embodiments, a fire-retardant coating for aerogel felt encapsulation is provided, comprising the following components in parts by weight:

[0049] In one specific embodiment, the aqueous resin includes at least one of ethylene vinyl acetate copolymer emulsion, ethylene-co-acrylic acid copolymer dispersion, and ethylene-co-methacrylic acid copolymer dispersion.

[0050] In one specific embodiment, the water-based colorant includes at least one of water-based black colorant, water-based iron red colorant, water-based yellow colorant, water-based blue colorant, water-based purple colorant, and water-based white colorant. The type of water-based colorant can be selected according to the color requirements of the coating, and the present invention does not impose any particular limitation. When there is no color requirement, the water-based colorant may not be added, that is, the content of water-based colorant is 0 parts.

[0051] In one specific embodiment, the filler slurry comprises the following components in parts by weight:

[0052] The filler slurry is prepared by adding pigments, fillers, matting powder, defoamer, dispersant and water weighed in parts by weight into a grinding mill and grinding and dispersing to prepare the filler slurry.

[0053] In one specific embodiment, the pigments and fillers are selected from at least one of barium sulfate, talc, and titanium dioxide; more preferably, the pigments and fillers include the following raw material components in parts by weight: 0-35 parts barium sulfate, 0-40 parts talc, 0-70 parts titanium dioxide; and the contents of barium sulfate, talc, and titanium dioxide are all 0 parts.

[0054] In a specific embodiment, the filler slurry comprises the following components in parts by weight: 20-40 parts of water, 5-35 parts of barium sulfate, 5-40 parts of talcum powder, 0-60 parts of titanium dioxide, 1-5 parts of matting powder, 2-5 parts of defoaming agent, 5-17 parts of dispersing agent.

[0055] The defoaming agent is selected from at least one of mineral oil defoaming agent, modified polyether modified siloxane, such as BYK011, BYK032, BYK028, Tego Airex 902W, etc., without special limitation in the present application.

[0056] The matting powder is selected from at least one of E1011, Tego OK520, C906, without special limitation in the present application.

[0057] The dispersing agent is selected from non-ionic wet dispersing agent, such as Tego Dispers 760W, BYK190, etc., without special limitation in the present application.

[0058] In a specific embodiment, the fire retardant used in the coating is selected from nitrogen-phosphorus composite fire retardant. Specifically, at least one of melamine type nitrogen-phosphorus composite fire retardant, ammonium polyphosphate type nitrogen-phosphorus composite fire retardant can be used. In a specific embodiment, when the ammonium polyphosphate type nitrogen-phosphorus fire retardant used is HF-202 (Shifang Taifeng Fire Retardant Co., Ltd.), HE-213T (Shifang Taifeng Fire Retardant Co., Ltd.), Exolit AP 435 (Clariant Chemicals (China) Co., Ltd.) or Exolit AP 462 (Clariant Chemicals (China) Co., Ltd.), the same or similar effect can be achieved.

[0059] In a specific embodiment, the pH regulator used in the coating is selected from at least one of dimethyl ethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine, to adjust the pH value of the coating to 8.0-8.5.

[0060] In a specific embodiment, the auxiliary agent used in the coating includes defoaming agent, wet dispersing agent, rheological auxiliary agent. Among them, the defoaming agent is selected from at least one of mineral oil defoaming agent, modified polyether modified siloxane, such as BYK011, BYK032, BYK028, Tego 902W, etc., without special limitation in the present application. The wet dispersing agent is selected from polyether modified siloxane, such as Tego-270, etc., without special limitation in the present application. The rheological auxiliary agent is selected from at least one of BYK Laponite-RDS, RHEOLATE 299, ASE60, HV30, without special limitation in the present application.

[0061] In a specific embodiment, the purpose of adding water is to adjust the viscosity of the finished paint, and the weight fraction can be any value in the range of 0-20 parts to meet the requirements of the paint viscosity, which is not particularly limited in the present application.

[0062] Under the above conditions, the aerogel packaging heat-insulating fire-retardant paint of the present application can be prepared.

[0063] In the following examples, the sources of each raw material used in the preparation of specific paints are as follows:

[0064] EVA-1 is DA-102H EVA emulsion, purchased from Dalian Chemical Co., Ltd., which is a high elongation at break, flame-retardant ethylene vinyl acetate copolymer emulsion, Tg is 0℃, and the molar ratio of ethylene to vinyl acetate is 2:8.

[0065] EVA-2 is DA-104 EVA emulsion, purchased from Dalian Chemical Co., Ltd., which is an ethylene vinyl acetate copolymer emulsion, Tg is <-10℃, and the molar ratio of ethylene to vinyl acetate is 3:7.

[0066] EVA-3 is DA0511 EVA emulsion, purchased from Dalian Chemical Co., Ltd., which is an ethylene vinyl acetate copolymer emulsion, Tg is 12-18℃, and the molar ratio of ethylene to vinyl acetate is 1:9.

[0067] EVA-4 is DA-207 EVA emulsion, purchased from Dalian Chemical Co., Ltd., which is an ethylene vinyl acetate copolymer emulsion, Tg is <0℃, and the molar ratio of ethylene to vinyl acetate is 2:8.

[0068] EVA-5 is 707BJ EVA emulsion, purchased from Beijing Oriental Chemical Factory, which is an ethylene vinyl acetate copolymer emulsion, Tg is 5℃, and the molar ratio of ethylene to vinyl acetate is 2:8.

[0069] The EAA dispersion is prepared by mixing EAA, water and NaOH in a ratio of 1:98:1, and then stirring uniformly at 100℃; the EAA used in the following examples is a water-dispersible EAA purchased from SK Corporation of Korea, which is a 5980I ethylene-co-acrylic acid copolymer with an acrylic acid content of 20.5wt%.

[0070] The EMAA dispersion is prepared by mixing EMAA, water and NaOH in a ratio of 1:95:4, and then stirring uniformly at 100℃; the EMAA used in the following examples is a water-based sarin resin purchased from Dow Chemical, which is a HDP3001 ethylene-co-methacrylic acid copolymer with a methacrylic acid content of 26wt%.

[0071] The water-based high-pigment black paste (fresh black EI0600-1) is purchased from Zhejiang Namex New Material Co., Ltd.

[0072] The alkyl phosphate was purchased from Jiangsu Weiguan New Material Technology Co., Ltd.

[0073] HF-202 was purchased from Shifang Taifeng Flame Retardant Co., Ltd., and is a polyphosphoric acid ammonium type nitrogen-phosphorus composite flame retardant.

[0074] The glass microbeads were purchased from 3M Company, and the model was VS 5500 3M. The particle size D50 of the glass microbeads was 20-60 pm.

[0075] The rheological aid RHEOLATE 299 was a polyurethane associated water-based rheological aid purchased from Haimenstechnology.

[0076] Dimethyl ethanolamine (DMEA (10%)) was purchased from BASF Company.

[0077] The defoaming agent was a modified polyether modified siloxane, and the model was BYK-011, purchased from BYK Company.

[0078] The wetting dispersant was a polyether modified siloxane, and the model was Tego-270, purchased from Tego Company.

[0079] The particle size of the barium sulfate was 3000 mesh, and it was purchased from Yangzhou Yuxin Powder Co., Ltd.

[0080] The particle size of the talc powder was 3000 mesh, and it was purchased from Yangzhou Yuxin Powder Co., Ltd.

[0081] The titanium white powder was model 902+, purchased from Komoo Titanium White Technology Co., Ltd.

[0082] The matting powder was model E1011, purchased from Japan Toagosei Company.

[0083] The non-ionic wetting dispersant was model Tego Dispers 760W, purchased from Tego Company.

[0084] Example 1

[0085] The present embodiment provides a fireproof coating for aerogel felt packaging, which comprises ethylene-vinyl acetate emulsion (EVA-1), water-based high pigment black paste (fresh black EI0600-1), filler paste, flame retardant (alkyl phosphate), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of each raw material component shown in Table 1. The weight fractions of each component used in the fireproof coating are shown in Table 2.

[0086] The preparation steps of the fireproof coating for aerogel felt packaging are as follows:

[0087] 1) The high-performance resin dispersion, rheological aid, defoaming agent, wetting dispersant are mixed according to the weight parts in Table 2, and a uniform high-shear water-based base is prepared by high-speed dispersion;

[0088] 2) The barium sulfate, talcum powder, titanium dioxide, E1011, BYK-011, Tego Dispers 760W and water are added to the grinder according to the weight parts in Table 1, and a filler slurry is prepared by grinding and dispersion. The fineness is determined to be below 20 μm according to GB / T 1724-2019 Determination of Grinding Fineness of Color Paint, Varnish and Printing Ink.

[0089] 3) The water-based high-color black slurry, the filler slurry prepared in step 2) and the flame retardant are added to the water-based base prepared in step 1) and high-speed dispersed. The fineness is determined to be below 20 μm according to GB / T 1724-2019 Determination of Grinding Fineness of Color Paint, Varnish and Printing Ink. The pH adjuster is added to adjust to 8.0-8.5, and the aerogel packaging fireproof coating is obtained.

[0090] Example 2

[0091] The present embodiment provides an aerogel felt packaging fireproof coating, which comprises ethylene-vinyl acetate emulsion (EVA-1), water-based high-color black slurry (fresh black EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), water. The filler slurry is composed of the raw material components shown in Table 1. The weight parts of each component used in the fireproof coating are shown in Table 2. The preparation method of the aerogel felt packaging fireproof coating is the same as that of Example 1.

[0092] Example 3

[0093] The present embodiment provides an aerogel felt packaging fireproof coating, which comprises ethylene-vinyl acetate emulsion (EVA-2), water-based high-color black slurry (fresh black EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), water. The filler slurry is composed of the raw material components shown in Table 1. The weight parts of each component used in the fireproof coating are shown in Table 2. The preparation method of the aerogel felt packaging fireproof coating is the same as that of Example 1.

[0094] Example 4

[0095] The present example provides a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion (EVA-3), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wet dispersing agent (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of each component used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 1.

[0096] Example 5

[0097] The present example provides a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion (EVA-4), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wet dispersing agent (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of each component used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 1.

[0098] Example 6

[0099] The present example provides a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion (EVA-5), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wet dispersing agent (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of each component used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 1.

[0100] Example 7

[0101] The present embodiment provides a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion (EVA-1), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wet dispersing agent (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of the components used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 1.

[0102] Example 8

[0103] The present embodiment provides a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion (EVA-1), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wet dispersing agent (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of the components used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 1.

[0104] Example 9

[0105] The present embodiment provides a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion and water dispersion resin (EVA-1 and EAA dispersion), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wet dispersing agent (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of the components used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 1.

[0106] Example 10

[0107] The present embodiment provides a fireproof coating for aerogel blanket packaging, which comprises water dispersion resin (EAA dispersion), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), glass microbeads (VS 5500 3M), pH regulator (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of the components used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that in Example 8.

[0108] Example 11

[0109] The present embodiment provides a fireproof coating for aerogel blanket packaging, which comprises water dispersion resin (EVA-1 and EMAA dispersion), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HKFR-P07 is prepared into a solution with a mass content of 66% by adding water), pH regulator (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of the components used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that in Example 1.

[0110] Example 12

[0111] The present embodiment provides a fireproof coating for aerogel blanket packaging, which comprises water dispersion resin (EAA dispersion), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water), glass microbeads (VS 5500 3M), pH regulator (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the raw material components shown in Table 1. The weight fractions of the components used in the fireproof coating are shown in Table 2. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that in Example 8.

[0112] Table 1 Raw material ratio of filler paste

[0113] Table 2 Raw materials and weight fractions of fireproof coating

[0114] Note: 66% nitrogen-phosphorus composite flame retardant is a water dispersion of a nitrogen-phosphorus composite flame retardant; 10% DMEA is a 10% mass content aqueous solution of DMEA, the addition amount in Table 1 is the weight fraction of 10% DMEA, which is converted to 0.1 parts of DMEA; the addition amount of DMEA can be adjusted according to the pH of the coating to be controlled within the range of 8.0-8.5.

[0115] Example 13

[0116] This example provides a fireproof coating for aerogel blanket packaging, which uses the same components and weight fractions as Example 10, except that the filler slurry used in this example is composed of the raw material components shown in Table 3, and the flame retardant used in this example is a 66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water.

[0117] The preparation steps of the fireproof coating for aerogel blanket packaging are the same as those of Example 10.

[0118] Example 14

[0119] This example provides a fireproof coating for aerogel blanket packaging, which uses the same components and weight fractions as Example 10, except that the filler slurry used in this example is composed of the raw material components shown in Table 3, and the flame retardant used in this example is a 66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water.

[0120] The preparation steps of the fireproof coating for aerogel blanket packaging are the same as those of Example 10.

[0121] Example 15

[0122] This example provides a fireproof coating for aerogel blanket packaging, which uses the same components and weight fractions as Example 10, except that the filler slurry used in this example is composed of the raw material components shown in Table 3, and the flame retardant used in this example is a 66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is prepared into a solution with a mass content of 66% by adding water.

[0123] The preparation steps of the fireproof coating for aerogel blanket packaging are the same as those of Example 10.

[0124] Table 3 Raw material ratio of filler slurry

[0125] Examples 16-27

[0126] Examples 16-27 provide a fireproof coating for aerogel blanket packaging, which comprises ethylene-vinyl acetate emulsion and / or aqueous dispersion resin (EAA dispersion and / or EMAA dispersion), water-based high-color black paste (fresh black EI0600-1), filler paste, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202, prepared into a solution with a mass content of 66% by adding water), glass microbeads (VS 5500 3M), pH adjuster (10% DMEA, i.e. a DMEA aqueous solution with a concentration of 10%), defoaming agent (BYK-011), wetting dispersant (Tego-270), rheological aid (RHEOLATE 299), and water. The filler paste is composed of the components shown in Table 1 above. The weight fractions of the components of the fireproof coating are shown in Table 4. The preparation method of the fireproof coating for aerogel blanket packaging is the same as that of Example 8.

[0127] Table 4 Raw materials and weight fractions of fireproof coating

[0128] Performance verification:

[0129] 1) After the fireproof coatings prepared in the above examples and comparative examples are film formed, the performance of the film layers prepared by the coatings is tested. The test standard for the flame retardant performance is “UL 94 EN STANDARD FOR SAFETY Tests for Flammability of Plastic Materials for Parts in Devices and Appliances”, and the test standard for the flexibility is “GB / T 1731-2020 Paint film, putty film flexibility determination method”.

[0130] 2) The coating prepared in each of the above examples is applied to the surface of the aerogel felt by dip coating, the aerogel felt is packaged, and the packaged aerogel felt is tested for fireproof performance. The test equipment is an S8162X mica plate combustion tester produced by Shanghai Suxuan Test Equipment Co., Ltd. The specific method for fireproof testing is as follows: aerogel is selected as pre-oxidized filament loaded silica aerogel, the thermal conductivity is 0.018-0.022 w / (m·k), and the thickness is 3.4 mm. After the coating prepared in each of the examples is applied to both surfaces of the aerogel felt to form a coating, the aerogel felt is cut into a test sample with a size of 15 cm x 15 cm; the two surfaces of the test sample coated with the coating are used as the front surface and the back surface, respectively, the front surface is ablated by a 900-1000℃ open flame, the appearance of the coating on the front surface is tested for changes with ablation time, and the temperature change of the back surface with ablation time is monitored. The aerogel felt substrate (i.e., the aerogel felt without a coating) is tested as a test sample according to this method, and the temperature of the back surface of the test sample reaches 186.5℃ in 60 s and 272.7℃ in 300 s. Based on this, the fireproof rating standard for the packaged aerogel felt is designed in combination with the requirement for thermal diffusion in the draft of GB 38031 Safety Requirements for Power Storage Batteries for Electric Vehicles, and the specific fireproof classification is shown in Table 5.

[0131] Table 5

[0132] The test results of each test sample are shown in Table 6.

[0133] Table 6

[0134] As can be seen from the results in Table 6, when EVA is used alone as the film-forming resin, the fireproof rating of the prepared coating is 1-3, and the coating prepared by using EVA-3 alone cracks when subjected to 180° bending (Example 2-6); when EAA or EMAA is used alone as the film-forming resin, 180° bending cracks occur (Examples 10, 12, 16, and 18); when EAA and / or EMAA is compounded with EVA as the main resin, the fireproof rating of the prepared coating can reach 4-5, and 180° bending does not crack (Examples 9, 11, 13-15, 17, 19-25).

[0135] As can be further seen from the results in Table 6, when the flame retardant is an alkyl phosphate, the fireproof rating is only 0, and when the flame retardant is a nitrogen-phosphorus composite flame retardant, the fireproof rating is significantly improved (comparison between Examples 1 and 2).

[0136] As can be further seen from the results in Table 6, after the glass beads are added to the coating of the present application, the fireproof rating can be further improved and 180° bending does not crack (comparison between Examples 23 and 27).

[0137] The application has many specific application approaches, and the above description is only the preferred embodiment of the application. It should be pointed out that the above examples are only used to illustrate the application, and are not used to limit the protection scope of the application. For ordinary skilled persons in the art, several improvements can be made without departing from the principles of the application, and these improvements should be considered as the protection scope of the application.

Claims

1. A fire retardant coating for aerogel blanket encapsulation, characterized in that, comprise the following parts by weight:

2. The fire protective coating for aerogel blanket encapsulation of claim 1, wherein, The water-based resin comprises at least one of ethylene-vinyl acetate copolymer emulsion, ethylene-co-acrylic acid copolymer dispersion, ethylene-co-methacrylic acid copolymer dispersion.

3. The fire protective coating for aerogel blanket encapsulation of claim 2, wherein, The water-based resin is any one of ethylene-vinyl acetate copolymer emulsion, ethylene-co-acrylic acid copolymer dispersion, ethylene-co-methacrylic acid copolymer dispersion; or The water-based resin is a combination of ethylene-co-acrylic acid copolymer dispersion and / or ethylene-co-methacrylic acid copolymer dispersion and ethylene-vinyl acetate copolymer emulsion.

4. The fire protective coating for aerogel blanket encapsulation of claim 2, wherein, The water-based resin is a combination of ethylene-co-acrylic acid copolymer dispersion and / or ethylene-co-methacrylic acid copolymer dispersion and ethylene-vinyl acetate copolymer emulsion.

5. The aerogel blanket encapsulant fireproofing coating of claim 2 or 3 or 4, wherein, The glass transition temperature Tg of the ethylene-vinyl acetate copolymer emulsion is below 20℃, and the molar ratio of ethylene to vinyl acetate is below 3:7; In the ethylene-co-acrylic acid copolymer dispersion, the content of ethylene-co-acrylic acid copolymer is 1-10wt%; in the ethylene-co-acrylic acid copolymer, the content of acrylic acid is greater than or equal to 20wt%; In the ethylene-co-methacrylic acid copolymer dispersion, the content of ethylene-co-methacrylic acid copolymer is 1-2wt%; in the ethylene-co-methacrylic acid copolymer, the content of methacrylic acid is greater than or equal to 25wt%.

6. The aerogel blanket encapsulant fireproofing coating of claim 4, wherein, The weight ratio of the ethylene-co-acrylic acid copolymer dispersion and / or ethylene-co-methacrylic acid copolymer dispersion to the ethylene-vinyl acetate copolymer emulsion is 1:2-2:

1.

7. The aerogel blanket encapsulation fireproofing coating of claim 1, wherein, The water-based color paste comprises at least one of water-based black paste, water-based iron red paste, water-based yellow paste, water-based blue paste, water-based purple paste, water-based white paste.

8. The aerogel blanket encapsulation fireproofing coating of claim 1, wherein, The filler slurry comprises the following parts by weight of each component:

9. The aerogel blanket encapsulant fireproofing coating of claim 8, wherein, The pigment filler is selected from at least one of barium sulfate, talc, titanium dioxide; The defoaming agent is selected from at least one of mineral oil defoaming agent, modified polyether modified siloxane; The opacifying powder is selected from E1011, Tego OK520, At least one of C906; The dispersant is selected from non-ionic wet dispersant.

10. The fire protective coating for aerogel blanket encapsulation of claim 9, wherein, The pigment filler comprises the following weight fractions of each raw material component: 0-35 parts of barium sulfate, 0-40 parts of talc; 0-70 parts of titanium dioxide; and the content of barium sulfate, talc, titanium dioxide is not simultaneously 0. The defoaming agent is selected from at least one of BYK011, BYK032, BYK028, Tego Airex 902W; The dispersant is selected from at least one of Tego Dispers 760W, BYK190.

11. The aerogel blanket encapsulant fireproofing coating of claim 8 or 9 or 10, wherein, The preparation method of the filler paste comprises the following steps: adding the pigment filler, flatting powder, defoaming agent, dispersant and water weighed by weight fraction into a grinder, and grinding and dispersing to prepare the filler paste.

12. The aerogel blanket encapsulant fireproofing coating of claim 1, wherein, The flame retardant is selected from at least one of alkyl phosphate, nitrogen-phosphorus composite flame retardant; The pH regulator is selected from at least one of dimethyl ethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine.

13. The aerogel blanket encapsulation fireproofing coating of claim 1, wherein, The auxiliary agent comprises at least one of defoaming agent, wet dispersant, rheological auxiliary agent.

14. The aerogel blanket encapsulant fireproofing coating of claim 13, wherein, The defoaming agent is selected from at least one of mineral oil defoaming agent, modified polyether modified siloxane; The wetting dispersant is selected from polyether-modified siloxane. The rheological aid is selected from at least one of BYK Laponite-RDS, RHEOLATE 299, ASE60, HV30.

15. The aerogel blanket encapsulant fireproofing coating of claim 14, wherein, The defoaming agent is selected from at least one of BYK011, BYK032, BYK028, Tego902W. The wetting dispersant is selected from Tego-270.

16. A process for the preparation of a fireproofing coating for aerogel blanket according to any one of claims 1-15, characterized in that, The method comprises the following steps: A. mixing the water-based resin, the aid, and water, and preparing a high-shear water-based base by high-speed dispersion; B. adding the weighed water-based color paste, the filler paste, the glass microbead, and the organic flame retardant into the high-shear water-based base prepared in step A, performing high-speed dispersion, and then adding a pH regulator to control the pH to be 8.0-8.5, thereby obtaining the fireproof coating for aerogel felt packaging.

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