Fireproof coating for packaging aerogel felt and preparation method thereof

Abstract

The invention provides a fireproof coating for packaging an aerogel felt and a preparation method of the fireproof coating. The fireproof coating comprises the following components in parts by weight: 30-50 parts of water-based resin, 0-10 parts of water-based color paste, 20-50 parts of 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 adopting the specific water-based resin and combining with the specific flame retardant, the packaging coating for the aerogel felt with fireproof performance can be prepared. Tests show that the fireproof grade can reach 4-5 grade, and the flexibility can reach 180 degrees without cracking when bent.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a packaging coating and a preparation method thereof, and in particular to a fire retardant coating for aerogel felt packaging and a preparation method thereof. Background Art

[0002] With the rapid development of new energy vehicles, the safety of the power batteries used in them has received more and more attention, especially the risk of spontaneous combustion causing high-temperature open flames. Aerogel felt 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 a powder loss problem. The volatilized aerogel powder will not only affect the thermal insulation properties of the aerogel felt, but will also seriously endanger human health. Therefore, packaging protection must be carried out to reduce the safety risks of the battery. The current packaging materials are basically made of polymer materials, and it is difficult to achieve fireproof performance. According to the draft for comments on "GB 38031 Safety Requirements for Power Batteries for Electric Vehicles", the battery pack or system should provide a thermal event alarm signal 5 minutes before the thermal runaway of a single battery causes heat diffusion, which in turn causes danger to the passenger compartment. This puts forward direct requirements for the aerogel felt and aerogel packaging materials.

[0003] In previous research conducted by the applicant team, a flame retardant coating for aerogel encapsulation with a flame retardant rating of UL94V0, a ​​flexibility of 180° without cracking, and a shear strength of more than 0.8MPa was prepared by using a resin dispersion with high tensile strength and high elongation at break, in combination with filler slurry, flame retardant and other additives (see patent document CN118029170A). However, the coating cannot meet the fire retardant performance requirements. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a fire retardant coating for aerogel felt packaging and a preparation method thereof.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a fire retardant coating for aerogel felt packaging, comprising the following components in parts by weight:

[0007]

[0008]

[0009] As a preferred embodiment, the aqueous resin includes 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.

[0010] As a preferred embodiment, the aqueous resin is any one of ethylene vinyl acetate copolymer emulsion, ethylene-co-acrylic acid copolymer dispersion, and ethylene-co-methacrylic acid copolymer dispersion; or

[0011] The aqueous resin is a combination of an ethylene-co-acrylic acid copolymer dispersion and / or an ethylene-co-methacrylic acid copolymer dispersion and an ethylene-vinyl acetate copolymer emulsion.

[0012] As a further preferred embodiment, 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. Specifically, the water-based resin is a combination of ethylene-co-acrylic acid copolymer dispersion and ethylene-vinyl acetate copolymer emulsion, or a combination of ethylene-co-methacrylic acid copolymer dispersion and ethylene-vinyl acetate copolymer emulsion, or a combination of ethylene-co-acrylic acid copolymer dispersion, ethylene-co-methacrylic acid copolymer dispersion and ethylene-vinyl acetate copolymer emulsion.

[0013] As a preferred embodiment, the glass transition temperature Tg of the ethylene-vinyl acetate copolymer emulsion is below 20°C, and the molar ratio of ethylene to vinyl acetate is below 3:7. More preferably, the glass transition temperature Tg is below 5°C, and the ratio of vinyl acetate is 3:7-1:9.

[0014] As a preferred embodiment, in the ethylene-co-acrylic acid copolymer dispersion, the content of ethylene-co-acrylic acid copolymer is 1-10wt%, which can be obtained by preparing ethylene-co-acrylic acid copolymer, water and NaOH in a mass ratio of 1-10:89-98:1.

[0015] As a preferred embodiment, in the ethylene-co-methacrylic acid copolymer dispersion, the content of ethylene-co-methacrylic acid copolymer is 1-2wt%, which can be obtained by preparing ethylene-co-methacrylic acid copolymer, water and NaOH in a ratio of 1-2:94-95:4.

[0016] As a preferred embodiment, the acrylic acid content in the ethylene-co-acrylic acid copolymer is greater than or equal to 20wt%. In the early experiments of the present invention, it was found that if the acrylic acid content in the ethylene-co-acrylic acid copolymer is too low, it will not be soluble and thus cannot be applied to the fire retardant coating of the present invention.

[0017] As a preferred embodiment, the methacrylic acid content in the ethylene-co-methacrylic acid copolymer is greater than or equal to 25wt%. In the early experiments of the present invention, it was found that if the methacrylic acid content in the ethylene-co-methacrylic acid copolymer is too low, it will not be dissolved and thus cannot be applied to the fire retardant coating of the present invention.

[0018] As a preferred embodiment, the weight ratio of the ethylene-co-acrylic acid copolymer dispersion and / or the 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 weight ratio of the total weight of the ethylene-co-acrylic acid copolymer dispersion and the ethylene-co-methacrylic acid copolymer dispersion to the ethylene-vinyl acetate copolymer emulsion is 1:2-2:1.

[0019] As a preferred embodiment, the water-based resin is an ethylene-co-methacrylic acid copolymer dispersion and an ethylene-vinyl acetate emulsion copolymer in a weight ratio of 1:2 to 2:1.

[0020] As a preferred solution, the weight percentage of the glass microspheres is 10-20. When the content of the glass microspheres is too high, the coating cannot be prepared due to the high water absorption of the microspheres.

[0021] As a preferred embodiment, the aqueous color paste includes at least one of aqueous black paste, aqueous iron red paste, aqueous yellow paste, aqueous blue paste, aqueous purple paste, and aqueous white paste.

[0022] As a preferred embodiment, the filler slurry comprises the following components in parts by weight:

[0023]

[0024] As a preferred embodiment, the pigment filler is selected from at least one of barium sulfate, talcum powder and titanium dioxide.

[0025] As a preferred embodiment, the defoaming agent is selected from at least one of mineral oil defoaming agents and modified polyether-modified siloxane.

[0026] As a preferred embodiment, the matting powder is selected from E1011, Tego OK520, At least one of C906.

[0027] As a preferred embodiment, the dispersant is selected from nonionic wetting and dispersing agents.

[0028] As a preferred solution, the pigment and filler include the following raw material components in parts by weight: 0-35 parts of barium sulfate, 0-40 parts of talc; 0-70 parts of titanium dioxide; and the contents of barium sulfate, talc and titanium dioxide are not all 0 parts at the same time.

[0029] As a preferred embodiment, the defoaming agent is selected from at least one of BYK011, BYK032, BYK028 and Tego Airex 902W.

[0030] As a preferred embodiment, the dispersant is selected from at least one of Tego Dispers 760W and BYK190.

[0031] As a preferred embodiment, the method for preparing the filler slurry comprises the following steps: adding pigments, fillers, matting powder, defoaming agent, dispersant and water weighed in parts by weight into a grinder, and grinding and dispersing to prepare the filler slurry.

[0032] As a preferred embodiment, the flame retardant is selected from at least one of alkyl phosphate and nitrogen-phosphorus composite flame retardant.

[0033] As a further preferred embodiment, the flame retardant is selected from nitrogen-phosphorus composite flame retardants, and more preferably the flame retardant is at least one of melamine-type nitrogen-phosphorus composite flame retardants and ammonium polyphosphate-type nitrogen-phosphorus composite flame retardants.

[0034] As a preferred embodiment, the pH regulator is selected from at least one of dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia water, and triethylamine.

[0035] As a preferred solution, the auxiliary agent includes at least one of a defoamer, a dispersant, and a rheological auxiliary agent.

[0036] As a preferred embodiment, the defoamer is selected from at least one of a mineral oil defoamer and a modified polyether-modified siloxane;

[0037] As a preferred embodiment, the dispersant is selected from polyether-modified siloxane.

[0038] As a preferred solution, the rheological additive is selected from at least one of BYK Laponite-RDS, RHEOLATE 299, ASE60, and HV30.

[0039] As a preferred embodiment, the defoaming agent is selected from at least one of BYK011, BYK032, BYK028, and Tego902W;

[0040] As a preferred embodiment, the dispersant is selected from at least one of Tego-270, BYK190 and BYK192.

[0041] In a second aspect, the present invention provides a method for preparing a fire retardant coating for aerogel felt packaging, comprising the following steps:

[0042] A. Weigh the water-based resin, additives and water, mix them, and disperse them at high speed to prepare a high-shear water-based base material;

[0043] B. Add the weighed aqueous color paste, filler paste, glass beads and organic flame retardant to the high shear aqueous base prepared in step A, disperse at high speed, and then add a pH adjuster to control the pH at 8.0-8.5 to obtain the fire retardant coating for aerogel felt packaging.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1) The present invention adopts a specific water-based resin and combines it with a specific flame retardant to prepare a fire-proof aerogel felt packaging coating. According to tests, the fire-proof grade of the coating can reach 1-5.

[0046] 2) The present invention further adopts EAA and / or EMAA and EVA compound, and adds a certain amount of glass beads to prepare an encapsulation coating for aerogel felt, which can take into account both fire resistance and flexibility. According to tests, its fire resistance level can reach 4-5, and its flexibility can reach 180° bending without cracking. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0048] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0049] It should be understood that, except in any operating examples, or otherwise indicated, all numbers representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary according to the desired performance to be obtained by the present invention. At least, it is not intended to limit the application of the doctrine of equivalents to the scope of the claims, and each numerical parameter should at least be interpreted according to the number of reported significant figures and by applying ordinary rounding techniques.

[0050] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0051] In the following embodiments, a fire retardant coating for aerogel felt packaging is provided, comprising the following components in parts by weight:

[0052]

[0053] In a 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.

[0054] In a specific embodiment, 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. The type of water-based color paste can be selected according to the color requirements of the coating, and the present invention does not make any special restrictions. When there is no color requirement, the water-based color paste may not be added, that is, the content of the water-based color paste is 0 parts.

[0055] In one specific embodiment, the filler slurry comprises the following components in parts by weight:

[0056]

[0057] The preparation method of the filler slurry is as follows: adding pigments, fillers, matting powder, defoaming agent, dispersant and water weighed in parts by weight into a grinder, and grinding and dispersing to prepare the filler slurry.

[0058] In a specific embodiment, the color filler is selected from at least one of barium sulfate, talc, and titanium dioxide; more preferably, the color filler includes the following raw material components in parts by weight: 0-35 parts of barium sulfate, 0-40 parts of talc; 0-70 parts of titanium dioxide; and the content of barium sulfate, talc, and titanium dioxide is not 0 part at the same time.

[0059] In a specific embodiment, the filler slurry includes the following components in parts by weight: 20-40 parts of water, 5-35 parts of barium sulfate, 5-40 parts of talc, 0-60 parts of titanium dioxide, 1-5 parts of matting powder, 2-5 parts of defoaming agent, and 5-17 parts of dispersant.

[0060] The defoamer is selected from at least one of mineral oil defoamers and modified polyether-modified siloxanes, such as BYK011, BYK032, BYK028, Tego Airex 902W, etc., and the present invention does not make any particular limitation.

[0061] The matting powder is selected from E1011, Tego OK520, At least one of C906 is not particularly limited in the present invention.

[0062] The dispersant is selected from non-ionic wetting and dispersing agents, such as Tego Dispers 760W, BYK190, etc., and the present invention does not make any special limitation.

[0063] In a specific embodiment, the flame retardant used in the coating is selected from nitrogen-phosphorus composite flame retardants. Specifically, at least one of melamine-type nitrogen-phosphorus composite flame retardants and ammonium polyphosphate-type nitrogen-phosphorus composite flame retardants can be used. In a specific embodiment, when the ammonium polyphosphate-type nitrogen-phosphorus flame retardant used is HF-202 (Shifang Taifeng Flame Retardant Co., Ltd.), HE-213T (Shifang Taifeng Flame Retardant Co., Ltd.), Exolit AP 435 (Clariant Chemicals (China) Co., Ltd.) or ExolitAP 462 (Clariant Chemicals (China) Co., Ltd.), the same or similar effects can be achieved.

[0064] In a specific embodiment, the pH adjuster used in the coating is selected from at least one of dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia water, and triethylamine to adjust the pH value of the coating to 8.0-8.5.

[0065] In a specific embodiment, the additives used in the coating include defoamers, dispersants, and rheological additives. The defoamer is selected from at least one of mineral oil defoamers and modified polyether-modified siloxanes, such as BYK011, BYK032, BYK028, Tego902W, etc., which are not specifically limited in the present invention. The dispersant is selected from polyether-modified siloxanes, such as Tego-270, BYK190, BYK192, etc., which are not specifically limited in the present invention. The rheological additive is selected from at least one of BYK Laponite-RDS, RHEOLATE 299, ASE60, and HV30, which are not specifically limited in the present invention.

[0066] In a specific embodiment, the purpose of adding water is to adjust the viscosity of the finished coating. Any value of the added weight of 0-20 parts can meet the coating viscosity requirement, and the present invention does not make any special limitation.

[0067] Under the above conditions, the heat-insulating and fire-retardant coating for aerogel encapsulation of the present invention can be prepared.

[0068] In the following examples, the raw materials and sources used in the specific coating preparation are as follows:

[0069] EVA-1 is DA-102H EVA emulsion purchased from Dalian Chemical Co., Ltd. It is a high elongation at break, flame retardant ethylene vinyl acetate copolymer emulsion with a Tg of 0°C and a molar ratio of ethylene to vinyl acetate of 2:8.

[0070] EVA-2 is DA-104EVA emulsion purchased from Dalian Chemical Co., Ltd., which is an ethylene-vinyl acetate copolymer emulsion with Tg<-10°C and a molar ratio of ethylene to vinyl acetate of 3:7.

[0071] EVA-3 is DA0511 EVA emulsion purchased from Dalian Chemical Co., Ltd. It is an ethylene-vinyl acetate copolymer emulsion with a Tg of 12-18°C and a molar ratio of ethylene to vinyl acetate of 1:9.

[0072] EVA-4 is DA-207EVA emulsion purchased from Dalian Chemical Co., Ltd., which is an ethylene-vinyl acetate copolymer emulsion with Tg<0°C and a molar ratio of ethylene to vinyl acetate of 2:8.

[0073] EVA-5 is 707BJ EVA emulsion purchased from Beijing Oriental Chemical Plant. It is an ethylene vinyl acetate copolymer emulsion with a Tg of 5°C and a molar ratio of ethylene to vinyl acetate of 2:8.

[0074] The EAA dispersion is prepared by mixing EAA with water and NaOH in a ratio of 1:98:1 and stirring at 100°C; the EAA used in the following examples is a water-dispersible EAA purchased from SK Company of South Korea, which is a 5980I ethylene-co-acrylic acid copolymer with an acrylic acid content of 20.5 wt%.

[0075] EMAA dispersion is prepared by mixing EMAA, water and NaOH in a ratio of 1:95:4 and stirring at 100°C; the EMMA used in the following examples is a water-based surin resin purchased from Dow Chemical, which is HDP3001 ethylene-co-methacrylic acid copolymer with a methacrylic acid content of 26 wt%.

[0076] Water-based high-pigment black paste (Fresh Black EI0600-1) was purchased from Zhejiang Nami New Materials Co., Ltd.

[0077] Alkyl phosphate was purchased from Jiangsu Weiguan New Material Technology Co., Ltd.

[0078] HF-202 was purchased from Shifang Taifeng Flame Retardant Co., Ltd. and is an ammonium polyphosphate type nitrogen-phosphorus composite flame retardant.

[0079] The glass microspheres were purchased from 3M Company, model number VS 5500 3M, and the particle size D50 of the glass microspheres was 20-60 μm.

[0080] The rheological additive RHEOLATE 299 is a polyurethane associative water-based rheological additive purchased from Hemingway.

[0081] Dimethylethanolamine (DMEA (10%)) was purchased from BASF.

[0082] The defoaming agent is modified polyether-modified siloxane, model BYK-011, purchased from BYK Company.

[0083] The dispersant is polyether-modified siloxane, model number is Tego-270, purchased from Tego Company.

[0084] The particle size of barium sulfate was 3000 mesh and was purchased from Yangzhou Yuxin Powder Company.

[0085] The particle size of talcum powder was 3000 mesh and was purchased from Yangzhou Yuxin Powder Company.

[0086] The titanium dioxide model is 902+, purchased from Chemours Titanium Dioxide Technology Co., Ltd.

[0087] The matting powder model is E1011, purchased from Tosoh Corporation of Japan.

[0088] The nonionic wetting and dispersing agent is Tego Dispers 760W, purchased from Tego.

[0089] Example 1

[0090] This embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-1), water-based high-pigment black slurry (Fresh Black EI0600-1), filler slurry, flame retardant (alkyl phosphate), pH adjuster (10% DMEA, i.e., 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of the components used in the fire-retardant coating are shown in Table 2.

[0091] The preparation steps of the fire retardant coating for aerogel felt packaging are as follows:

[0092] 1) mixing the high-performance resin dispersion, rheological additive, defoamer, and dispersant weighed in parts by weight in Table 2, and dispersing at high speed to prepare a uniform high-shear aqueous base;

[0093] 2) Add barium sulfate, talcum powder, titanium dioxide, E1011, BYK-011, TegoDispers 760W and water weighed according to the weight parts in Table 1 into a grinder, grind and disperse to prepare a filler slurry, according to GB / T

[0094] 1724-2019 Determination of the fineness of grinding of paints, varnishes and printing inks” determines the fineness to be less than 20μm.

[0095] 3) Add water-based high-pigment black slurry, filler slurry and flame retardant prepared in step 2) to the water-based base prepared in step 1) and disperse at high speed according to GB / T 1724-2019 Determination of grinding fineness of paints, varnishes and printing inks

[0096] The fineness is determined to be below 20 μm, and a pH adjuster is added to adjust the pH to 8.0-8.5 to obtain the fire retardant coating for aerogel encapsulation.

[0097] Example 2

[0098] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-1), water-based high-pigment black slurry (Xianliteihei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0099] Example 3

[0100] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-2), water-based high-pigment black slurry (Xianlithei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. DMEA aqueous solution with a concentration of 10%), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0101] Example 4

[0102] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-3), water-based high-pigment black slurry (Xianliteihei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. DMEA aqueous solution with a concentration of 10%), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0103] Example 5

[0104] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-4), water-based high-pigment black slurry (Xianliteihei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0105] Example 6

[0106] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-5), water-based high-pigment black slurry (Xianlithei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0107] Example 7

[0108] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-1), water-based high-pigment black slurry (Xianliteihei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0109] Example 8

[0110] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion (EVA-1), water-based high-pigment black slurry (Fresh Black EI0600-1), filler slurry, flame retardant (alkyl phosphate), glass microspheres (VS5500 3M), pH adjuster (10% DMEA, i.e., 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is basically the same as that in Example 1, except that: in step 3), glass microspheres are also added.

[0111] Example 9

[0112] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion and water dispersion resin (EVA-1 and EAA dispersion), water-based high-pigment black slurry (Fresh Black EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is basically the same as that in Example 1.

[0113] Example 10

[0114] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including water dispersion resin (EAA dispersion), water-based high-pigment black slurry (Xianlithei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), glass microspheres (VS 5500 3M), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 8.

[0115] Embodiment 11

[0116] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including water dispersion resin (EVA-1 and EMAA dispersion), water-based high-pigment black slurry (Xianlithei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HKFR-P07 is added with water to prepare a solution with a mass content of 66%), pH adjuster (10% DMEA, i.e. a 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 1.

[0117] Example 12

[0118] The present embodiment provides a fire-retardant coating for aerogel felt packaging, including water dispersion resin (EMAA dispersion), water-based high-pigment black slurry (Xianlithei EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), glass microbeads (VS 5500 3M), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE299), and water. The filler slurry is composed of the raw material components shown in Table 1. The weight proportions of each component used in the fire-retardant coating are shown in Table 2. The preparation method of the fire-retardant coating for aerogel felt packaging is the same as that in Example 8.

[0119] Table 1 Ratio of raw materials of filler slurry

[0120]

[0121]

[0122] Table 2 Raw materials and weight parts of fire retardant coating

[0123]

[0124] Note: 66% nitrogen-phosphorus composite flame retardant is a nitrogen-phosphorus composite flame retardant aqueous dispersion; 10% DMEA is a 10% mass content DMEA aqueous solution, the addition amount in Table 1 is the weight part of 10% DMEA, which is converted into 0.1 part by weight of DMEA; the amount of DMEA added can be adjusted according to the pH of the coating within the range of 8.0 to 8.5.

[0125] Embodiment 13

[0126] The present embodiment provides a fire retardant coating for aerogel felt packaging, and the components and weight proportions used are basically the same as those in Example 10, with the only difference being that the filler slurry used in the present embodiment is composed of the raw material components shown in Table 3, and the flame retardant used in the present embodiment is a 66% nitrogen-phosphorus composite flame retardant, that is, HF-202 is added with water to prepare a solution with a mass content of 66%.

[0127] The preparation steps of the fire retardant coating for aerogel felt packaging are the same as those in Example 10.

[0128] Embodiment 14

[0129] The present embodiment provides a fire retardant coating for aerogel felt packaging, and the components and weight proportions used are basically the same as those in Example 10, with the only difference being that the filler slurry used in the present embodiment is composed of the raw material components shown in Table 3, and the flame retardant used in the present embodiment is a 66% nitrogen-phosphorus composite flame retardant, that is, HF-202 is added with water to prepare a solution with a mass content of 66%.

[0130] The preparation steps of the fire retardant coating for aerogel felt packaging are the same as those in Example 10.

[0131] Embodiment 15

[0132] The present embodiment provides a fire retardant coating for aerogel felt packaging, and the components and weight proportions used are basically the same as those in Example 10, with the only difference being that the filler slurry used in the present embodiment is composed of the raw material components shown in Table 3, and the flame retardant used in the present embodiment is a 66% nitrogen-phosphorus composite flame retardant, that is, HF-202 is added with water to prepare a solution with a mass content of 66%.

[0133] The preparation steps of the fire retardant coating for aerogel felt packaging are the same as those in Example 10.

[0134] Table 3 Ratio of raw materials for filler slurry

[0135]

[0136] Examples 16-27

[0137] Examples 16-27 provide a fire retardant coating for aerogel felt packaging, including ethylene-vinyl acetate emulsion and / or water dispersion resin (EAA dispersion and / or EMAA dispersion), water-based high-pigment black slurry (Fresh Black EI0600-1), filler slurry, flame retardant (66% nitrogen-phosphorus composite flame retardant, i.e. HF-202 is added with water to prepare a solution with a mass content of 66%), glass microspheres (VS 5500 3M), pH adjuster (10% DMEA, i.e. 10% DMEA aqueous solution), defoamer (BYK-011), dispersant (Tego-270), rheological additive (RHEOLATE 299), and water. The filler slurry is composed of the raw material components shown in Table 1 above. The weight proportions of each component used in the fire retardant coating are shown in Table 4. The preparation method of the fire retardant coating for aerogel felt packaging is the same as that of Example 8.

[0138] Table 4 Raw materials and weight parts of fire retardant coating

[0139]

[0140] Performance Verification:

[0141] 1) After the fire retardant coatings prepared in the above embodiments and comparative examples were formed into films, the film properties of each coating were tested. The test standard for flame retardancy was UL 94EN STANDARD FOR SAFETY Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, and the test standard for flexibility was GB / T 1731-2020 Determination of Flexibility of Paint Film and Putty Film.

[0142] 2) The coating prepared in each of the above embodiments is applied to the surface of the aerogel felt by dipping, the aerogel felt is encapsulated, and then the encapsulated aerogel felt is tested for fire resistance. The test equipment is the S8162X mica board combustion tester produced by Shanghai Sixuan Testing Equipment Co., Ltd. The specific method of the fire resistance test is: the aerogel is selected as pre-oxidized silk-loaded silica aerogel, the thermal conductivity is 0.018-0.022w / (m·k), and the thickness is 3.4mm. After the coating prepared in each embodiment is applied on both sides of the aerogel felt to form a coating, it is then cut into a 15cm×15cm test sample; the two sides of the test sample coated with the coating are used as the front and back sides respectively, and the front side is ablated with an open flame at 900-1000℃, and the appearance of the coating on the front side is tested with the ablation time, and the temperature change of the back side with the ablation time is monitored. The aerogel felt material (i.e., uncoated aerogel felt) was used as a test sample and tested according to this method. The temperature on the back of the test sample reached 186.5°C in 60s and 272.7°C in 300s. Based on this, combined with the requirements for heat diffusion in the draft for comments on GB 38031 Safety Requirements for Power Batteries for Electric Vehicles, the fire rating standard for aerogel felt after encapsulation was designed. The specific fire rating is shown in Table 5.

[0143] Table 5

[0144]

[0145] The test results of each test sample are shown in Table 6.

[0146] Table 6

[0147]

[0148]

[0149] It can be seen from the results in Table 6 that when EVA alone is used as the film-forming resin, the fire retardancy level of the prepared coating is 1-3, and the coating prepared using EVA-3 alone cracks when bent at 180° (Examples 2-6); when EAA or EMAA alone is used as the film-forming resin, cracks appear when bent at 180° (Examples 10, 12, 16, 18); when EAA and / or EMAA are compounded with EVA as the main resin, the fire retardancy level of the prepared coating can reach 4-5, and there is no cracking when bent at 180° (Examples 9, 11, 13-15, 17, 19-25).

[0150] It can be further seen from the results in Table 6 that when the flame retardant is an alkyl phosphate, its fire protection level is only level 0, while when the flame retardant is a nitrogen-phosphorus composite flame retardant, its fire protection level is significantly improved (comparison between Examples 1 and 2).

[0151] It can be further seen from the results in Table 6 that the addition of glass beads to the coating of the present invention can further improve the fire resistance level and prevent cracking when bent at 180° (comparison between Examples 23 and 27).

[0152] The present invention has many specific application paths, and the above is only a preferred embodiment of the present invention. It should be pointed out that the above embodiments are only used to illustrate the present invention, and are not used to limit the protection scope of the present invention. For those of ordinary skill in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A fire retardant coating for aerogel felt packaging, characterized in that: The composition comprises the following components in parts by weight:

2. The fire retardant coating for aerogel felt packaging according to claim 1, characterized in that: 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.

3. The fire retardant coating for aerogel felt packaging according to claim 2, characterized in that: The water-based resin is any one of ethylene-vinyl acetate copolymer emulsion, ethylene-co-acrylic acid copolymer dispersion, and ethylene-co-methacrylic acid copolymer dispersion; or The aqueous resin is a combination of an ethylene-co-acrylic acid copolymer dispersion and / or an ethylene-co-methacrylic acid copolymer dispersion and an ethylene-vinyl acetate copolymer emulsion.

4. The fire retardant coating for aerogel felt packaging according to claim 2, characterized in that: The aqueous resin is a combination of an ethylene-co-acrylic acid copolymer dispersion and / or an ethylene-co-methacrylic acid copolymer dispersion and an ethylene-vinyl acetate copolymer emulsion.

5. The fire retardant coating for aerogel felt packaging according to claim 2, 3 or 4, characterized in that: The glass transition temperature Tg of the ethylene-vinyl acetate copolymer emulsion is below 20° C., and the molar ratio of ethylene to vinyl acetate is below 3:7; In the ethylene-co-acrylic acid copolymer dispersion, the content of the 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 the ethylene-co-methacrylic acid copolymer is 1-2 wt %; in the ethylene-co-methacrylic acid copolymer, the content of methacrylic acid is greater than or equal to 25 wt %.

6. The fire retardant coating for aerogel felt packaging according to claim 4, characterized in that: The weight ratio of the ethylene-co-acrylic acid copolymer dispersion and / or the ethylene-co-methacrylic acid copolymer dispersion to the ethylene-vinyl acetate copolymer emulsion is 1:2-2:

1.

7. The fire retardant coating for aerogel felt packaging according to claim 1, characterized in that: 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.

8. The fire retardant coating for aerogel felt packaging according to claim 1, characterized in that: The filler slurry comprises the following components in parts by weight:

9. The fire retardant coating for aerogel felt packaging according to claim 8, characterized in that: The pigment and filler are selected from at least one of barium sulfate, talcum powder and titanium dioxide; The defoamer is selected from at least one of a mineral oil defoamer and a modified polyether-modified siloxane; The matting powder is selected from E1011, Tego OK520, At least one of C906; The dispersant is selected from nonionic wetting and dispersing agents.

10. The fire retardant coating for aerogel felt packaging according to claim 9, characterized in that: The pigment and filler include the following raw material components in parts by weight: 0-35 parts of barium sulfate, 0-40 parts of talc powder; 0-70 parts of titanium dioxide; and the contents of barium sulfate, talc powder and titanium dioxide are not all 0 parts at the same time. The defoamer is selected from at least one of BYK011, BYK032, BYK028, and Tego Airex 902W; The dispersant is selected from at least one of Tego Dispers 760W and BYK190.

11. The fire retardant coating for aerogel felt packaging according to claim 8, 9 or 10, characterized in that: The method for preparing the filler slurry comprises the following steps: adding pigments, fillers, matting powder, defoaming agent, dispersant and water weighed in parts by weight into a grinder, and grinding and dispersing to prepare the filler slurry.

12. The fire retardant coating for aerogel felt packaging according to claim 1, characterized in that: The flame retardant is selected from at least one of alkyl phosphate and nitrogen-phosphorus composite flame retardant; The pH regulator is selected from at least one of dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia water, and triethylamine.

13. The fire retardant coating for aerogel felt packaging according to claim 1, characterized in that: The auxiliary agent includes at least one of a defoamer, a dispersant, and a rheological auxiliary agent.

14. The fire retardant coating for aerogel felt packaging according to claim 13, characterized in that: The defoamer is selected from at least one of a mineral oil defoamer and a modified polyether-modified siloxane; The dispersant is selected from polyether-modified siloxane; The rheological additive is selected from at least one of BYK Laponite-RDS, RHEOLATE 299, ASE60 and HV30.

15. The fire retardant coating for aerogel felt packaging according to claim 14, characterized in that: The defoamer is selected from at least one of BYK011, BYK032, BYK028 and Tego902W; The dispersant is selected from at least one of Tego-270, BYK190 and BYK192.

16. A method for preparing a fire retardant coating for aerogel felt packaging according to any one of claims 1 to 15, characterized in that: The following steps are involved: A. Weigh the water-based resin, additives and water, mix them, and disperse them at high speed to prepare a high-shear water-based base material; B. Add the weighed aqueous color paste, filler paste, glass beads and organic flame retardant to the high shear aqueous base prepared in step A, disperse at high speed, and then add a pH adjuster to control the pH at 8.0-8.5 to obtain the fire retardant coating for aerogel felt packaging.

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