Electronic liquid seal flame-retardant material and application thereof

Abstract

The invention discloses an electronic liquid seal flame-retardant material and application thereof, the material comprises a fluorine-containing polymer, a rheology modifier and a functional nano-material in a mass ratio of (70-99.5): (0-20): (0-10); wherein the fluorine-containing compound is one or more of perfluoroether, perfluoroamine, perfluoroketone and hydrofluoroether; the rheology modifier is one or more of polytetrafluoroethylene, fatty acid, fatty acid salt, polyurea and hydrocarbon wax; the functional nano material is one or more of silicon oxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, clay and calcium carbonate. When the electronic liquid seal flame-retardant material is used for liquid seal of electronic devices and systems, flame-retardant and explosion-proof effects can be achieved.

Description

Technical Field

[0001] This invention relates to the field of electronic liquid sealing. More specifically, it relates to an electronic liquid sealing flame-retardant material and its application. Background Technology

[0002] A liquid seal is a seal formed by a liquid. Liquid seals are generally suitable for applications where the pressure difference between the inside and outside of the seal is not very large (such as in the laboratory production of oxygen using hydrogen peroxide) but where high sealing requirements are needed or where valve installation is not feasible. The medium used in a liquid seal is generally required not to react with the gas being sealed; water or oil are commonly used. Examples of liquid seals in everyday life include the S-bend in drain pipes, which is a type of liquid seal used to prevent foul odors from escaping from the sewer.

[0003] Electronic liquid seals refer to structures in electronic devices and systems that use liquid materials to form a seal.

[0004] Given that electronic devices are prone to short circuits and overheating during use, the large amount of heat generated can cause the electrolyte to vaporize, producing a large amount of gas that can burst the battery casing. It can also cause air to be drawn back into the battery, leading to a violent chemical reaction with reactive metals, resulting in phenomena such as combustion and explosion, posing potential hazards to consumers. Summary of the Invention

[0005] The first technical problem this invention aims to solve is to provide an electronic liquid-sealing flame-retardant material. When used as a liquid-sealing material in electronic devices, this material provides flame retardancy and explosion protection, achieving a flame retardancy rating of V-0. The electronic liquid-sealing material of this invention is non-toxic, harmless, and non-corrosive; it is non-conductive and does not affect the normal operation of the battery; it is self-non-combustible; and it isolates oxygen, preventing combustion and explosion. It is an ideal liquid-sealing flame-retardant and explosion-proof material for electronic devices.

[0006] The second technical problem to be solved by the present invention is to provide an application of electronic liquid-sealed flame-retardant material in electronic devices and systems for flame retardancy and explosion protection through liquid sealing.

[0007] To solve the first technical problem mentioned above, the technical solution adopted by the present invention is as follows: :

[0008] An electronically sealed flame-retardant material comprises a fluoropolymer, a rheology modifier, and functional nanomaterials, wherein the mass ratio of the three components is 70-99.5:0-20:0-10; wherein,

[0009] The fluorinated compound is one or more of perfluoroethers, perfluoroamines, perfluoroketones, and hydrofluoroethers;

[0010] The rheology modifier is one or more of polytetrafluoroethylene, fatty acids, fatty acid salts, polyurea, and hydrocarbon waxes;

[0011] The functional nanomaterial is one or more of silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, clay, and calcium carbonate.

[0012] Preferably, the number-average molecular weight of the fluoropolymer is 3000-20000.

[0013] Preferably, the perfluoroether has the structural formula CF3O(C3F6O). m (C2F4O) n (CF2O) x CF3; where m, n, and x are any integers greater than or equal to 0.

[0014] Preferably, the perfluoroamine has the structural formula (C m F 2m+1 )N(C x F 2x+1 (C) x F 2x+1 ); where m and x are any integers greater than or equal to 0.

[0015] Preferably, the perfluoroketone has the structural formula C m F 2m+1 C(O)C x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0016] Preferably, the hydrofluoroether has the structural formula C m H 2m+1 OC x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0017] Preferably, the CF3 in the end group of the perfluoroether, perfluoroamine, perfluoroketone or hydrofluoroether is replaced by one of C(O)OCH2Br, C(O)OCH2P(O)(OR′)(OR″), C(O)OCH2O-B(OR′)(OR″), CzF2zO-B(OR′)(OR″), CzF2zCH2P(O)(OR′)(OR″), CzF2zCH2O-P(O)(OR′)(CH2NH2), CzF2zCH2Br, CzF2zCH2O-P(O)(OR′)CH3, CzF2zCH2-P(O)(OR′)(OCH2NH2), wherein R′ and R″ are CH3 or C2H5 respectively, and z is selected from an integer between 1 and 5.

[0018] Preferably, one or more H atoms in the C(O)OCH2Br, C(O)OCH2P(O)(OR′)(OR″), C(O)OCH2O-B(OR′)(OR″), CzF2zO-B(OR′)(OR″), CzF2zCH2P(O)(OR′)(OR″), CzF2zCH2O-P(O)(OR′)(CH2NH2), CzF2zCH2Br, CzF2zCH2O-P(O)(OR′)CH3, and CzF2zCH2-P(O)(OR′)(OCH2NH2) groups are replaced by Br or F.

[0019] Preferably, the flame-retardant material has a breakdown voltage higher than 40kV, a dielectric constant less than 2, a flame retardant rating of V0, a ​​viscosity of 200-1000 mPa·s, and a volume resistivity greater than 1-10. 15 Ω·cm.

[0020] To solve the second technical problem mentioned above, the present invention adopts the following technical solution. :

[0021] As mentioned above, electronic liquid-sealed flame-retardant materials are used in electronic devices and systems for their liquid-sealed flame retardancy and explosion-proof applications.

[0022] Preferably, the electronic devices and systems include, but are not limited to, energy storage devices.

[0023] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.

[0024] Unless otherwise specified, all raw materials used in this invention can be obtained commercially, and the equipment used in this invention can be conventional equipment in the relevant field or refer to existing technology in the relevant field.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] When used as a liquid sealing material for electronic devices, the material of this invention can prevent air from entering the device and isolate oxygen, thereby playing a role in flame retardancy and explosion prevention. The flame retardancy rating of the electronic sealing material can reach V-0 level. Detailed Implementation

[0027] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0028] As one aspect of the present invention, an electronically sealed flame-retardant material comprises a fluoropolymer, a rheology modifier, and functional nanomaterials, wherein the mass ratio of the three components is 70-99.5:0-20:0-10; wherein,

[0029] The fluorinated compound is one or more of perfluoroethers, perfluoroamines, perfluoroketones, and hydrofluoroethers;

[0030] The rheology modifier is one or more of polytetrafluoroethylene, fatty acids, fatty acid salts, polyurea, and hydrocarbon waxes;

[0031] The functional nanomaterial is one or more of silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, clay, and calcium carbonate.

[0032] As some embodiments of the present invention, the mass ratio of the fluoropolymer, rheology modifier and functional nanomaterial is 70-95:1-20:1-10, or 70-90:3-20:2-10, or 70-85:5-20:3-10, or 70-80:7-20:4-10, or 70-80:9-20:6-10, or 70-80:11-20:7-10, or 70-80:13-20:8-10, or 70-80:15-20:9-10.

[0033] In this application, the flame retardancy rating of the electronic sealing material is mainly classified according to the UL94 standard, which is a test method for the flammability of plastic materials developed by the International Electrotechnical Commission (IEC). According to the UL94 standard, the flame retardancy rating is divided into four levels from low to high: HB, V-2, V-1, and V-0.

[0034] HB rating: This is the lowest flame retardant rating 3 in the UL94 standard. For samples with a thickness of 3 to 13 mm, the burning rate should be less than 40 mm / min; for samples with a thickness of less than 3 mm, the burning rate should be less than 70 mm / min, or extinguish before the 100 mm mark.

[0035] V-2 level: After the sample undergoes two 10-second burning tests, the flame should extinguish within 60 seconds, and burning material may fall off.

[0036] V-1 level: After the sample undergoes two 10-second burning tests, the flame should also extinguish within 60 seconds, but no burning material should fall off.

[0037] V-0 rating: This is the highest flame retardant rating in the UL94 standard. After two 10-second burning tests, the flame should extinguish within 30 seconds, and no burning material should fall off.

[0038] According to certain embodiments of the present invention, the number-average molecular weight of the fluoropolymer is 3000-20000.

[0039] According to certain embodiments of the present invention, the perfluoroether has the structural formula CF3O(C3F6O). m (C2F4O) n (CF2O) x CF3; where m, n, and x are any integers greater than or equal to 0.

[0040] According to certain embodiments of the present invention, the perfluoroamine has the structural formula (C m F 2m+1 )N(C x F 2x+1 (C) x F 2x+1 ); where m and x are any integers greater than or equal to 0.

[0041] According to certain embodiments of the present invention, the perfluoroketone has the structural formula C0. m F 2m+1 C(O)C x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0042] According to certain embodiments of the present invention, the hydrofluoroether has the structural formula C m H 2m+1 OC x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0043] According to certain embodiments of the present invention, the CF3 in the end group of the perfluoroether, perfluoroamine, perfluoroketone or hydrofluoroether is replaced by one of C(O)OCH2Br, C(O)OCH2P(O)(OR′)(OR″), C(O)OCH2O-B(OR′)(OR″), CzF2zO-B(OR′)(OR″), CzF2zCH2P(O)(OR′)(OR″), CzF2zCH2O-P(O)(OR′)(CH2NH2), CzF2zCH2Br, CzF2zCH2O-P(O)(OR′)CH3, CzF2zCH2-P(O)(OR′)(OCH2NH2), wherein R′ and R″ are CH3 or C2H5 respectively, and z is selected from an integer between 1 and 5;

[0044] According to certain embodiments of the present invention, one or more H atoms in the C(O)OCH2Br, C(O)OCH2P(O)(OR′)(OR″), C(O)OCH2O-B(OR′)(OR″), CzF2zO-B(OR′)(OR″), CzF2zCH2P(O)(OR′)(OR″), CzF2zCH2O-P(O)(OR′)(CH2NH2), CzF2zCH2Br, CzF2zCH2O-P(O)(OR′)CH3, and CzF2zCH2-P(O)(OR′)(OCH2NH2) groups are replaced by Br or F.

[0045] According to certain embodiments of the present invention, the flame-retardant material has a breakdown voltage higher than 40kV, a dielectric constant less than 2, a flame retardant rating of VO, a viscosity of 200-1000 mPa·s, and a volume resistivity greater than 1-10. 15 Ω·cm.

[0046] As another aspect of the present invention, the present invention provides an application of the above-mentioned electronic liquid-sealed flame-retardant material in electronic devices and systems through liquid-sealed flame retardancy and explosion protection.

[0047] According to certain embodiments of the present invention, the electronic devices and systems include, but are not limited to, energy storage devices.

[0048] Example 1

[0049] An electronically sealed flame-retardant material comprises a fluoropolymer and functional nanomaterials in a mass ratio of 70:0.5; wherein,

[0050] The fluorinated compound is one of the perfluoroethers;

[0051] The functional nanomaterial is silicon dioxide;

[0052] The perfluoroether has the structural formula CF3O(C3F6O). m (C2F4O) n (CF2O) x CF3; where m, n, and x are any integers greater than or equal to 0.

[0053] Example 2

[0054] An electronically sealed flame-retardant material comprises a fluoropolymer, a rheology modifier, and functional nanomaterials, wherein the mass ratio of the three components is 99.5-20:10; wherein,

[0055] The fluorinated compound is a perfluoroamine;

[0056] The rheology modifier is polytetrafluoroethylene;

[0057] The functional nanomaterial is aluminum oxide;

[0058] The structural formula of the perfluoroamine is (C m F 2m+1 )N(CxF 2x+1 (C) x F 2x+1 ); where m and x are any integers greater than or equal to 0.

[0059] Example 3

[0060] An electronically sealed flame-retardant material comprises a fluoropolymer, a rheology modifier, and functional nanomaterials in a mass ratio of 80:10:5; wherein,

[0061] The fluorinated compound is a perfluoroketone;

[0062] The rheology modifier is a fatty acid;

[0063] The functional nanomaterial is magnesium hydroxide;

[0064] The structural formula of the perfluoroketone is C. m F 2m+1 C(O)C x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0065] Example 4

[0066] An electronically sealed flame-retardant material comprises a fluoropolymer, a rheology modifier, and functional nanomaterials in a mass ratio of 75:5:2; wherein,

[0067] The fluorinated compound is a hydrofluoroether;

[0068] The rheology modifier is polyurea;

[0069] The functional nanomaterial is hydrotalcite;

[0070] The structural formula of the hydrofluoroether is C. m H 2m+1 OC x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0071] Example 5

[0072] An electronically sealed flame-retardant material comprises a fluoropolymer, a rheology modifier, and functional nanomaterials, in a mass ratio of 85:15:7; wherein,

[0073] The fluorinated compound is a hydrofluoroether;

[0074] The rheology modifier is a hydrocarbon wax;

[0075] The functional nanomaterial is calcium carbonate;

[0076] The structural formula of the hydrofluoroether is C. m H 2m+1 OC x F 2x+1 ; where m and x are any integers greater than or equal to 1.

[0077] Experimental Example 1

[0078] The materials from Examples 1-5 were used as liquid sealing materials for vehicle-mounted lithium-ion storage batteries.

[0079] Testing showed that the liquid sealing material in this experimental example met the V-0 standard according to UL94; the lithium-ion storage battery will release a certain amount of gas when the battery is short-circuited, but the battery will not burn or explode.

[0080] Experimental Example 2

[0081] The materials from Examples 1-5 were used as liquid sealing materials for lithium battery energy storage systems.

[0082] Testing showed that the liquid sealing material in this experimental example met the V-0 standard according to UL94; the lithium battery energy storage system will not burn or explode when a single battery is short-circuited, and all batteries except the short-circuited single battery will operate normally.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An electronically sealed flame-retardant material, characterized in that, The material comprises fluoropolymers, rheology modifiers, and functional nanomaterials, with a mass ratio of 70–99.5:0–20:0–10; among which, The fluorinated compound is one or more of perfluoroethers, perfluoroamines, perfluoroketones, and hydrofluoroethers; The rheology modifier is one or more of polytetrafluoroethylene, fatty acids, fatty acid salts, polyurea, and hydrocarbon waxes; The functional nanomaterial is one or more of silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, clay, and calcium carbonate.

2. The electronic liquid-sealed flame-retardant material according to claim 1, characterized in that: The number average molecular weight of the fluoropolymer is 3000 to 20000.

3. The electronic liquid-sealed flame-retardant material according to claim 1, characterized in that: The perfluoroether has the structural formula CF3O(C3F6O). m (C2F4O) n (CF2O) x CF3; where m, n, and x are any integers greater than or equal to 0.

4. The electronic liquid-sealed flame-retardant material according to claim 1, characterized in that: The structural formula of the perfluoroamine is (C m F 2m+1 )N(C n F 2n+1 (C) x F 2x+1 ); where m, n and x are any integers greater than or equal to 0.

5. The electronic liquid-sealed flame-retardant material according to claim 1, characterized in that: The structural formula of the perfluoroketone is C. m F 2m+1 C(O)C x F 2x+1 ; where m and x are any integers greater than or equal to 1.

6. The electronic liquid-sealed flame-retardant material according to claim 1, characterized in that: The structural formula of the hydrofluoroether is C. m H 2m+1 OC x F 2x+1 ; where m and x are any integers greater than or equal to 1.

7. The electronic liquid-sealed flame-retardant material according to any one of claims 3 to 6, characterized in that: The CF3 in the end group of the perfluoroether, perfluoroamine, perfluoroketone or hydrofluoroether is replaced by one of C(O)OCH2Br, C(O)OCH2P(O)(O-R')(OR”), C(O)OCH2O-B(O-R')(OR”), CzF2zO-B(O-R')(OR”), CzF2zCH2P(O)(O-R')(OR”), CzF2zCH2O-P(O)(O-R')(CH2NH2), CzF2zCH2Br, CzF2zCH2O-P(O)(O-R')CH3, CzF2zCH2-P(O)(O-R')(OCH2NH2), wherein R' and R” are CH3 or C2H5 respectively, and z is selected from an integer between 1 and 5; Preferably, one or more H atoms in the C(O)OCH2Br, C(O)OCH2P(O)(O-R')(OR”), C(O)OCH2O-B(O-R')(OR”), CzF2zO-B(O-R')(OR”), CzF2zCH2P(O)(O-R')(OR”), CzF2zCH2O-P(O)(O-R')(CH2NH2), CzF2zCH2Br, CzF2zCH2O-P(O)(O-R')CH3, and CzF2zCH2-P(O)(O-R')(OCH2NH2) groups are replaced by Br or F.

8. The electronic liquid-sealed flame-retardant material according to claim 1, characterized in that, The flame-retardant material has a breakdown voltage higher than 40kV, a dielectric constant less than 2, a flame retardant rating of V0, a ​​viscosity of 200-1000 mPa·s, and a volume resistivity greater than 1-10. 15 Ω·cm.

9. The application of the electronic liquid seal flame retardant material as described in any one of claims 1 to 8 as a liquid sealant material for electronic devices and systems in terms of flame retardancy and explosion protection.

10. The application according to claim 9, characterized in that: The electronic devices and systems include, but are not limited to, energy storage devices.