Low-temperature-bending-resistant sulfur-free fireproof coating for packaging aerogel felt and preparation method of low-temperature-bending-resistant sulfur-free fireproof coating

Abstract

The invention discloses a low-temperature-bending-resistant sulfur-free fireproof coating for packaging aerogel felt and a preparation method thereof. The coating comprises the following components in parts by weight: 35-50 parts of sulfur-free resin, 20-45 parts of pigment paste, 0-20 parts of a flame retardant, 0.1-2 parts of a defoaming agent, 0.1-2 parts of a substrate wetting agent, 0.5-2 parts of a thickening agent, 0-10 parts of an anti-freezing agent and 0-10 parts of a plasticizer. According to the invention, the sulfur content of the resin, the pigment and the additive adopted by the coating is measured, and the resin with the sulfur content not detected in the test result is selected to design the formula of the sulfur-free coating, so that the sulfur-free coating which passes a dryness test and a low-temperature flexibility test is obtained and can be applied to aerogel felt packaging. Furthermore, by adding a specific flame retardant, the fireproof performance (grade to 1-5) and good heat insulation performance can be achieved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly to a packaging coating and a preparation method thereof, and more particularly to a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt packaging and a preparation method thereof. Background Art

[0002] Aerogel felt is a flexible thermal insulation felt made by in-situ generating silica or metal-based aerogel composites in a supercritical environment with glass fiber, carbon fiber, ceramic glass fiber cotton or pre-oxidized fiber felt as the base material. Due to its excellent heat insulation ability, it is widely used in electric vehicle battery packs. In the previous research of the inventor's team, in order to solve the problem of powder falling of aerogel felt and improve the flame retardancy of packaging materials, an environmentally friendly flame retardant coating for aerogel felt packaging was developed. Referring to the records in patent document CN118029170A, by using a resin dispersion with a tensile strength of more than 10 N / mm 2 above, an elongation at break of more than 800%, and a minimum film-forming temperature of more than 0°C in combination with a filler slurry, a flame retardant and other additives, the prepared coating has a flame retardancy rating reaching UL94 V0, a flexibility of not cracking under 180° bending, and a shear strength of more than 0.8 MPa.

[0003] However, according to the Basel Convention, its goal is to reduce the generation of hazardous waste and ensure its environmentally sound management in the country of origin or the receiving country. Sulfur-containing raw materials are likely to generate sulfur-containing hazardous waste during production, use, etc. If not properly treated, it may cause air pollution and acid rain, or leakage and pollution of soil and water bodies, thus posing a threat to the ecosystem and human health. Therefore, mainstream foreign automobile factories have sulfur-free requirements for purchased raw materials, parts, etc. The environmentally friendly flame retardant coating for aerogel felt packaging developed by the inventor's team in the early stage fails to meet the sulfur-free requirement after testing. After testing, the sulfur content of this environmentally friendly flame retardant coating (the coating prepared in the examples) is all above 180 ppm. Based on this, the present invention attempts to develop a new sulfur-free coating for aerogel felt packaging to meet the needs of customers.

[0004] In addition, the requirements for low-temperature bending resistance and fireproof performance are also the needs of customers. Therefore, the present invention further attempts to develop a sulfur-free coating that takes into account low-temperature bending resistance and fireproof performance. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt packaging and a preparation method thereof.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation, comprising the following components in parts by weight:

[0008]

[0009] As a preferred solution, the sulfur-free resin is selected from at least one of aqueous polyurethane dispersions and ethylene-acrylic copolymer emulsions.

[0010] As a preferred solution, the aqueous polyurethane dispersion includes at least one of Leasys 3502, YC-102, RH-1358, and RH-1335;

[0011] The ethylene-acrylic copolymer emulsion includes Twax-7014.

[0012] As a preferred solution, the sulfur-free resin is at least one of RH-1358 and RH-1335, or a combination of YC-102 and Twax-7014.

[0013] As a further preferred solution, when the sulfur-free resin is a combination of YC-102 and Twax-7014, the weight ratio of YC-102 to Twax-7014 is 1:0.8 - 1.2, and more preferably, the weight ratio of YC-102 to Twax-7014 is 1:1.

[0014] As a preferred solution, the sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation includes the following components in parts by weight:

[0015]

[0016] The sulfur-free fireproof coating prepared under this weight ratio has good drying performance, does not crack in the low-temperature flexibility test, and has a fire protection level of 1 - 5.

[0017] As a further preferred solution, the sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation includes the following components in parts by weight:

[0018]

[0019] The sulfur-free fireproof coating prepared under this weight ratio has good drying performance, does not crack in the low-temperature flexibility test, and has a fire protection level of 3 - 5.

[0020] As a most preferred solution, the sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation includes the following components in parts by weight:

[0021]

[0022] The sulfur-free fireproof coating prepared under this weight parts ratio has good drying property, no cracking in the low-temperature flexibility test, a fire protection rating of Class 4, and in the heat insulation performance test, a little coating adheres to the edge of the cold plate.

[0023] As a preferred solution, the pigment paste comprises the following components in parts by weight:

[0024]

[0025] As a preferred solution, in the pigment paste, the sulfur-free pigment is selected from at least one of sulfur-free white pigment, sulfur-free black pigment, sulfur-free red pigment, sulfur-free blue pigment, sulfur-free green pigment, sulfur-free purple pigment, and sulfur-free yellow pigment. The selection of the sulfur-free pigment can be made accordingly to meet the required color of the coating and the requirement that the sulfur content is tested as NA using "EN 14582-2016 Waste Characterization - Halogen and Sulfur Content - Closed System Oxygen Combustion and Determination Method", and no special limitation is made in the present invention.

[0026] As a further preferred solution, the sulfur-free pigment is selected from titanium dioxide (such as rutile titanium dioxide).

[0027] As a preferred solution, in the pigment paste, the defoamer is selected from at least one of mineral oil defoamers and modified polyether modified siloxanes.

[0028] As a preferred solution, in the pigment paste, the dispersant is selected from polyether modified siloxanes.

[0029] As a further preferred solution, in the pigment paste, the dispersant is selected from at least one of BYK190, BYK192, and Tego 760.

[0030] As a preferred solution, in the pigment paste, the defoamer is selected from at least one of Airex 902W, BYK032, BYK028, and BYK011.

[0031] As a preferred solution, the preparation method of the pigment paste comprises the following steps: Weigh the sulfur-free pigment, defoamer, dispersant, and water according to parts by weight and add them into a grinding machine, and grind and disperse to prepare the pigment paste.

[0032] As a preferred solution, in the sulfur-free fireproof coating, the flame retardant is selected from ammonium polyphosphate flame retardants.

[0033] As a further preferred solution, the ammonium polyphosphate flame retardant comprises AP462.

[0034] As a preferred solution, in the sulfur-free fireproof coating, the plasticizer is selected from 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

[0035] As a preferred embodiment, in the sulfur-free fireproof coating, the defoamer is selected from at least one of mineral oil defoamers and modified polyether modified siloxanes.

[0036] As a further preferred embodiment, the defoamer is selected from at least one of Airex 902W, BYK032, BYK028, and BYK011.

[0037] As a preferred embodiment, in the sulfur-free fireproof coating, the substrate wetting agent is selected from at least one of BYK346, BYK347, BYK348, BYK349, and Tego 270.

[0038] As a preferred embodiment, in the sulfur-free fireproof coating, the thickener is selected from at least one of RHEOLATE 299, ASE60, and RDS.

[0039] As a preferred embodiment, in the sulfur-free fireproof coating, the antifreeze is selected from propylene glycol. The purpose of adding the antifreeze is that the coating prepared with the coating of the present application can meet the possible low-temperature requirements during low-temperature storage and transportation. When the temperature range of the storage and transportation conditions is 5 - 30 °C, there is no need to add an antifreeze. Therefore, no special limitation is imposed on the addition of the antifreeze.

[0040] As a preferred embodiment, in the sulfur-free fireproof coating, a pH regulator in an amount of 0 - 2 parts by weight is further included.

[0041] As a further preferred embodiment, the pH regulator is selected from DMEA.

[0042] In a second aspect, the present invention provides a method for preparing a sulfur-free fireproof coating with low-temperature bending resistance for encapsulating aerogel felt, comprising the following steps:

[0043] A. Add the flame retardant to water and disperse it evenly to form a flame retardant dispersion;

[0044] B. Mix the sulfur-free resin, plasticizer, defoamer, substrate wetting agent, and thickener, and disperse them at high speed to prepare a high-shear aqueous base material;

[0045] B. Add the pigment paste and the flame retardant dispersion to the high-shear aqueous base material prepared in step A, and disperse them at high speed to obtain the sulfur-free fireproof coating with low-temperature bending resistance for encapsulating aerogel felt.

[0046] In a third aspect, the present invention provides a method for encapsulating aerogel felt, comprising the following steps: Coating the aforementioned sulfur-free fireproof coating with low-temperature bending resistance on the surface of the aerogel felt by means of dip coating, spraying, roll coating, or curtain coating, and the encapsulation of the aerogel felt can be achieved.

[0047] Fourthly, the present invention provides a heat insulation pad, which includes aerogel felt and the aforementioned sulfur-free fireproof coating with low-temperature bending resistance; the sulfur-free fireproof coating with low-temperature bending resistance is coated on the surface of the aerogel felt for encapsulating the aerogel felt.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1) By measuring the sulfur content of the resin used in the coating and selecting the resin with an undetected sulfur content in the test results for the design of the sulfur-free coating formulation, the present invention obtains a coating that is sulfur-free as tested by the EN 14582-2016 method, passes the drying test and the low-temperature flexibility test, and can be applied to the encapsulation of aerogel felt.

[0050] 2) By further measuring the sulfur content of the flame retardant used in the coating and selecting the ammonium polyphosphate flame retardant with an undetected sulfur content in the test results for the design of the sulfur-free coating formulation, the present invention further obtains a coating that simultaneously has fireproof performance (grade 1-5). And by further optimizing the formulation of each raw material component, a fireproof grade of 4-5 can be achieved.

[0051] 3) In order to further meet the requirements of the draft of "GB 38031 Safety Requirements for Power Batteries for Electric Vehicles" regarding thermal diffusion, by optimizing the formulation of each raw material component, a coating with better heat insulation performance can be obtained (in the heat insulation performance test, when the cold plate reaches 300 °C, a test result of more than 5 minutes being OK; the test result of the surface coating of the material is that a little coating adheres to the edge of the cold plate). Specific Embodiments

[0052] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made. These all belong to the protection scope of the present invention.

[0053] The terms "preferred", "preferably", "more preferably", etc. in the present invention refer to the embodiments of the present invention that can provide certain beneficial effects in certain cases. However, in the same or other cases, other embodiments may also be preferred. 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 invention.

[0054] It should be understood that, except in any operating instance or otherwise indicated, all numbers representing, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximations that vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0055] Although 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. However, any numerical value inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0056] To meet the sulfur-free requirement, the inventor team first tested the sulfur content of the core raw material for preparing the coating, namely the polymer resin. Since no test results of the sulfur content are provided for the polymer resins currently sold on the market, it is impossible to directly know whether each polymer resin contains sulfur or the level of its sulfur content. Therefore, for different types and grades of polymer resins, we conducted sulfur content tests. The test method was carried out according to "EN 14582-2016 Waste characterization - Halogen and sulfur content - Closed system oxygen combustion and determination method", and the test results are shown in Table 1 (Note: NA indicates not detected).

[0057] Table 1

[0058]

[0059]

[0060] As can be seen from the results in Table 1, only YC-102, RH-1358, RH-1335, and Twax-7014 are sulfur-free, while other resins all contain sulfur, and the sulfur content varies between 86 and 2840 ppm.

[0061] The present invention further conducted corresponding tests on the sulfur content of the flame retardant, and the test results are shown in Table 2.

[0062] Table 2

[0063]

[0064]

[0065] As can be seen from the results in Table 2, only AP462 is sulfur-free, while other flame retardants all contain sulfur, and the sulfur content varies between 504 and 1762 ppm.

[0066] Based on the above test results, we developed a sulfur-free coating. Further, the coating formulation was adjusted and optimized based on other performance requirements.

[0067] In the following examples, the other raw materials and their sources used for the specific coating preparation are as follows:

[0068] The defoamer is a modified polyether-modified silicone, with the model Airex 902W, purchased from Tego.

[0069] The substrate wetting agent has the model BYK-349 and is purchased from BYK.

[0070] The dispersant is a polyether-modified silicone, with the model BYK-190, purchased from BYK.

[0071] The plasticizer is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, with the model TXIB, purchased from Eastman; the test result of its sulfur content is: NA.

[0072] The thickener is RHEOLATE299, purchased from Elementis Specialties; the test result of its sulfur content is: NA.

[0073] The titanium dioxide is rutile titanium dioxide Ti-Pure TM R-902+, purchased from Chemours; the test result of its sulfur content is: NA.

[0074] The antifreeze is propylene glycol, purchased from Dow.

[0075] The pH regulator is DMEA.

[0076] Examples 1-11

[0077] Examples 1-11 of the present invention provide a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation, and the weight parts of its various components are shown in Table 3.

[0078] Table 3

[0079]

[0080]

[0081] Note: 50% AP462 is an aqueous solution of AP462 with a mass content of 50%, and the addition amount in Table 3 is the weight parts of 50% AP462. The weight parts of AP462 converted from Examples 5-8 are 15 parts; 10% DMEA is an aqueous dispersion of DMEA with a mass content of 10%, and the addition amount in Table 3 is the weight parts of 10% DMEA. The weight parts of DMEA converted are 0.1 part.

[0082] In Table 3, the pigment paste used is prepared from the raw materials in Table 4 according to the weight parts ratio.

[0083] Table 4

[0084] Pigment paste raw materials Parts by weight <![CDATA[H2O]]> 29 Titanium dioxide 65 Airex 902W 1 BYK-190 5

[0085] The preparation method of the low-temperature bending-resistant sulfur-free fireproof coating described in each embodiment specifically includes the following steps:

[0086] 1) Mix the resins, Airex 902W, BYK-349, TXIB, and RHEOLATE299 weighed according to the weight parts in Table 3, and disperse them at high speed to prepare a uniform high-shear aqueous base material;

[0087] 2) Add titanium dioxide, Airex 902W, BYK-190, and water weighed according to the weight parts in Table 4 into a grinding machine, grind and disperse to prepare a pigment paste, and determine that the fineness is below 20 μm according to "Determination of the fineness of grinding of paints, varnishes and printing inks - GB / T 1724-2019".

[0088] 3) Add the pigment paste and 50% AP462 in step 1 and disperse at high speed. Determine that the fineness is below 20 μm according to "Determination of the fineness of grinding of paints, varnishes and printing inks - GB / T 1724-2019", and adjust the pH to 8.0 - 8.5 with 10% DMEA (i.e., an aqueous solution of DMEA with a concentration of 10%), then the low-temperature bending-resistant sulfur-free fireproof coating for aerogel encapsulation is obtained.

[0089] Comparative Example 1

[0090] This comparative example provides a low-temperature bending-resistant sulfur-free fireproof coating for aerogel felt encapsulation, whose components and weight parts are basically the same as those in Example 1, except that: Twax-7014 is not added in this comparative example, and the weight part of YC-102 is 45 parts. The weight parts of each component are shown in Table 1.

[0091] The preparation method of the low-temperature bending-resistant sulfur-free fireproof coating for aerogel felt encapsulation is the same as that in Example 1.

[0092] Comparative Example 2

[0093] This comparative example provides a low-temperature bending-resistant sulfur-free fireproof coating for aerogel felt encapsulation, whose components and weight parts are basically the same as those in Example 1, except that: YC-102 is not added in this comparative example, and the weight part of Twax-7014 is 45 parts. The weight parts of each component are shown in Table 1.

[0094] The preparation method of the low-temperature bending-resistant sulfur-free fireproof coating for aerogel felt encapsulation is the same as that in Example 1.

[0095] Comparative Example 3

[0096] This comparative example provides a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation. Its components and parts by weight are basically the same as those in Example 5, except that: in this comparative example, Twax-7014 is not added, and the part by weight of YC-102 is 40 parts. The parts by weight of each component are shown in Table 1.

[0097] The preparation method of the sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation is the same as that in Example 5.

[0098] Comparative Example 4

[0099] This comparative example provides a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation. Its components and parts by weight are basically the same as those in Example 7, except that: in this comparative example, DA-102 is used instead of RH-1358. The parts by weight of each component are shown in Table 1.

[0100] The preparation method of the sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation is the same as that in Example 7.

[0101] Examples 12 - 16

[0102] Examples 12 - 16 provide a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation. Its components and parts by weight are basically the same as those in Example 5, except that: in Example 12, 5 parts by weight of propylene glycol are added (in the preparation method of Example 1, propylene glycol is added together with the pigment paste and 50% AP462 in step 3); the parts by weight of Twax-7014 and YC-102 used in Examples 13 - 16 are different. The specific parts by weight of each component are shown in Table 5.

[0103] Table 5

[0104]

[0105]

[0106] The preparation method of the sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation is the same as that in Example 5.

[0107] Examples 17 - 20

[0108] Examples 17 - 20 of the present invention provide a sulfur-free fireproof coating with low-temperature bending resistance for aerogel felt encapsulation, and the parts by weight of its components are shown in Table 6.

[0109] Table 6

[0110]

[0111] In Table 6, each pigment paste used was prepared from the raw materials in Table 7 according to the weight parts ratio, and the preparation method of the pigment paste was the same as that in Example 1.

[0112] Table 7

[0113]

[0114] The preparation method of the low-temperature bending-resistant sulfur-free fireproof coating described in each example was the same as that in Example 12.

[0115] Performance verification:

[0116] 1) The coatings prepared in the above examples and comparative examples were subjected to sulfur content test, drying test and flexibility test at low temperature. Among them, the sulfur content test was carried out according to the method in EN 14582-2016; the drying test was carried out according to

[0117] the method in "GB / T 1728-1979 Determination Method for Drying Time of Coating Film" (OK indicates passing the finger-touch drying test without sticking phenomenon); the test standard for the flexibility test was "GB / T 1731-2020 Determination Method for Flexibility of Paint Film and Putty Film". The specific operation was as follows: after the coatings prepared in each example and comparative example were formed into films, they were placed at -30°C for 3 h, and then the samples were folded in half in an environment of -30°C, and the cracking situation of the coating was observed to judge the flexibility. Among them, when the coatings of Example 15 and 16 and Comparative Example 2 were formed into films, they could not form films, so the drying property and flexibility were not tested.

[0118] 2) Coat the coatings prepared in the above-mentioned examples and comparative examples on the surface of the aerogel felt by dip coating, encapsulate the aerogel felt, and then conduct high-temperature tests and fire resistance tests on the encapsulated aerogel felt. The test equipment for the fire resistance test is the S8162X mica plate combustion tester produced by Shanghai Sixuan Testing Equipment Co., Ltd. The specific method for the fire resistance test is as follows: Select the aerogel as the pre-oxidized fiber loaded silica aerogel, with a thermal conductivity of 0.018 - 0.022 W / (m·K) and a thickness of 3.4 mm. Coat the coatings prepared in each example on both sides of the aerogel felt to form a coating, and then cut it into test specimens of 15 cm × 15 cm; Take the two sides of the test specimen coated with the coating as the front and back respectively. Burn the front with an open flame at 900 - 1000 °C, test the change of the appearance of the coating on the front with the ablation time, and monitor the temperature change on the back with the ablation time. Use the aerogel felt material (i.e., the aerogel felt without coating) as the test specimen and test according to this method. The temperature on the back of the test specimen reaches 186.5 °C in 60 s and 272.7 °C in 300 s. Based on this, in combination with the requirements for thermal diffusion in the draft of "GB 38031 Safety Requirements for Power Batteries for Electric Vehicles", a fire resistance rating standard for the encapsulated aerogel felt is designed, and the specific fire ratings are shown in Table 8. Among them, when forming films with the coatings of Examples 15 and 16 and Comparative Example 2, film formation could not be achieved, so the fire resistance performance was not tested.

[0119] Table 8

[0120]

[0121] 3) Coat the coatings prepared in the above-mentioned examples and comparative examples on the surface of the aerogel felt by dip coating, encapsulate the aerogel felt, and then conduct heat insulation performance tests on the encapsulated aerogel felt as specimens. The purpose of the heat insulation performance is also to further meet the requirements for thermal diffusion in the draft of "GB 38031 Safety Requirements for Power Batteries for Electric Vehicles". The test method is as follows: Heat the hot plate of the heat insulation testing machine to 600 °C, place the test material (100 × 100 mm) on the cold plate, install the cold plate and press it against the hot plate with a pressure of 5000 N. Stop the test after the cold plate reaches 300 °C, record the time, and check whether the encapsulated coating of the specimen adheres to the cold plate. Among them, when forming films with the coatings of Examples 15 and 16 and Comparative Example 2, film formation could not be achieved, so the heat insulation performance was not tested.

[0122] The test results of each performance are shown in Table 9.

[0123] Table 9

[0124]

[0125]

[0126]

[0127] As can be seen from the results in Table 9, the coatings prepared in Examples 1-12, 17-20 do not contain sulfur, the drying property result is OK, and the flexibility tested at low temperature is that it does not crack at a 180° bend. Among them, the coatings prepared in Examples 5-12, 17-18, 20 further obtained fireproof performance with a fireproof grade of 1-5 grades due to the addition of a certain amount of flame retardant.

[0128] From the comparison results between Example 5 and Comparative Example 3, and between Example 1 and Comparative Examples 1 and 2, when the sulfur-free resin used is only YC-102, it will cause the flexibility tested at low temperature to crack at a 180° bend; when the sulfur-free resin used is only Twax-7014, it will cause film formation failure. Further, from the comparison results between Example 5 and Examples 13-16, when the sulfur-free resin used is only a combination of YC-102 and Twax-7014, in the content ratio of the two, when the content of YC-102 is too high, it will still cause the flexibility tested at low temperature to crack at a 180° bend; when the content of Twax-7014 is too high, it will still cause film formation failure. Only when the content ratio of the two is about 1:1 can the low-temperature bending resistance performance and film-forming property be taken into account.

[0129] Compared with the comparison result between Example 7 and Comparative Example 4, when using DA-102 instead of RH-135, the sulfur content of the prepared coating fails to meet the requirements, the flexibility tested at low temperature cracks at a 180° bend, and the heat insulation performance also deteriorates (the whole coating adheres to the cold plate).

[0130] There are many specific application ways of the present invention, and the above description is only the preferred implementation manner of the present invention. It should be noted that the above examples are only used to illustrate the present invention and do not limit the protection scope of the present invention. For those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements can still be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging, characterized in that: The composition comprises the following components in parts by weight:

2. The sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging according to claim 1, characterized in that: The sulfur-free resin is selected from at least one of an aqueous polyurethane dispersion and an ethylene-acrylic acid copolymer emulsion.

3. The sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging according to claim 2, characterized in that: The aqueous polyurethane dispersion includes at least one of Leasys 3502, YC-102, RH-1358, and RH-1335; The ethylene-acrylic acid copolymer emulsion includes Twax-7014.

4. The sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging according to claim 3, characterized in that: The sulfur-free resin is at least one of RH-1358 and RH-1335, or a combination of YC-102 and Twax-7014.

5. The sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging according to claim 1, characterized in that: The pigment slurry comprises the following components in parts by weight:

6. The sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging according to claim 5, characterized in that: The sulfur-free pigment is selected from at least one of sulfur-free white pigment, sulfur-free black pigment, sulfur-free red pigment, sulfur-free blue pigment, sulfur-free green pigment, sulfur-free purple pigment and sulfur-free yellow pigment; 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.

7. The sulfur-free fire retardant coating for low-temperature bending resistance of aerogel felt packaging according to claim 6, characterized in that: The defoamer is selected from at least one of Airex 902W, BYK032, BYK028 and BYK011; The dispersant is selected from at least one of BYK190, BYK192 and Tego 760.

8. The sulfur-free fire retardant coating for low-temperature bending resistance of aerogel felt packaging according to claim 5, 6 or 7, characterized in that: The method for preparing the pigment slurry comprises the following steps: adding sulfur-free pigment, defoamer, dispersant and water weighed in parts by weight into a grinder, and grinding and dispersing to prepare the pigment slurry.

9. The sulfur-free fire retardant coating for low-temperature bending resistance of aerogel felt packaging according to claim 1, characterized in that: The flame retardant is selected from ammonium polyphosphate flame retardant; The plasticizer is selected from 2,2,4-trimethyl-1,3-pentanediol diisobutyrate; The defoamer is selected from at least one of a mineral oil defoamer and a modified polyether-modified siloxane; The substrate wetting agent is selected from at least one of BYK346, BYK347, BYK348, BYK349, and Tego 270; The thickener is selected from at least one of RHEOLATE 299, ASE60, and RDS; The antifreeze agent is selected from propylene glycol.

10. The environmentally friendly flame retardant coating for aerogel felt packaging according to claim 9, characterized in that: The ammonium polyphosphate flame retardant includes AP462; The defoaming agent is selected from at least one of Airex 902W, BYK032, BYK028 and BYK011.

11. The sulfur-free fire retardant coating for low-temperature bending resistance of aerogel felt packaging according to claim 1, characterized in that: The coating also includes 0-2 parts by weight of a pH regulator; The pH adjuster is selected from DMEA.

12. A method for preparing a sulfur-free fire retardant coating resistant to low temperature bending for aerogel felt packaging according to any one of claims 1 to 11, characterized in that: The following steps are involved: A. Add the flame retardant into water and disperse it evenly to form a flame retardant dispersion; B. Mixing sulfur-free resin, plasticizer, defoamer, substrate wetting agent and thickener, and dispersing at high speed to prepare high shear water-based base; B. Add the pigment slurry and the flame retardant dispersion into the high shear aqueous base prepared in step A, and disperse at high speed to obtain the sulfur-free fire retardant coating for aerogel encapsulation that is resistant to low temperature bending.

13. A method for packaging aerogel felt, characterized in that: The method comprises the following steps: applying the sulfur-free fire retardant coating resistant to low temperature bending as described in any one of claims 1 to 11 on the surface of the aerogel felt by dipping, spraying, rolling or pouring, so as to achieve encapsulation of the aerogel felt.

14. A thermal insulation pad, characterized in that: It comprises an aerogel felt and the sulfur-free fire-retardant coating resistant to low temperature and bending as described in any one of claims 1 to 11; the sulfur-free fire-retardant coating resistant to low temperature and bending is coated on the surface of the aerogel felt for encapsulating the aerogel felt.

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