Fluoride-free anti-fingerprint agent as well as preparation method and application thereof

Abstract

The invention relates to a fluoride-free anti-fingerprint agent as well as a preparation method and application thereof. According to the fluoride-free anti-fingerprint agent, polypotent silane based on an isocyanurate ring, polysiloxane with one or more pods at one end and a catalyst are mixed, then a diluent is added, and the mixture is stirred to be uniform, so that the fluoride-free anti-fingerprint agent is obtained. The fluoride-free anti-fingerprint agent has good thermal stability, a fluoride-free anti-fingerprint film with good compactness can be formed in a vacuum evaporation or magnetron sputtering mode, and the fluoride-free anti-fingerprint film is good in film structure, has excellent anti-fingerprint performance and wear resistance and has extremely wide application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a fluorine-free anti-fingerprint agent and a preparation method and application thereof. Background Art

[0002] With the rapid development of society, consumers have higher and higher requirements on the touch and additional functions of various frequently touched products. Anti-fingerprint film, as a substrate surface protection layer, is widely used in the protection of touch screens, glass products, metal and plastic surfaces in the electronic display industry to avoid fingerprints and scratches left on the product surface by the touch and sliding of consumers' fingers when using these products.

[0003] At present, the mainstream anti-fingerprint agents use fluorine-containing compounds, such as perfluoropolyether, perfluoroalkyl compounds, etc., which are expensive and can cause harm to the environment and organisms. With the improvement of environmental awareness in society and the increasingly stringent environmental regulations, the replacement of fluorine-containing anti-fingerprint agents with fluorine-free anti-fingerprint agents has become a trend.

[0004] The current preparation methods of anti-fingerprint films, such as spraying, roller coating, dip-pull, spin coating, etc., form a functional coating on the substrate, and then undergo a certain curing method to form a film. Although this film-forming method has low production costs and can be applied to most mainstream anti-fingerprint materials, the processing accuracy is difficult to meet actual needs. At present, there are some common coating methods, such as vacuum evaporation, magnetron sputtering, etc., which have high processing accuracy and are also widely used in the preparation of coatings for precision components. Taking vacuum evaporation as an example, it refers to a process method in which a certain heating evaporation method is used to evaporate the coating material under vacuum conditions and gasify it, and the particles fly to the surface of the substrate to condense into a film. It has the advantages of simple film-forming method, high film purity and density, and unique film structure and performance. However, most of the current fluorine-free anti-fingerprint agents use polymers such as polyurethane or acrylate monomers as the matrix, which are not suitable for vacuum evaporation or magnetron sputtering to prepare anti-fingerprint films. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a fluorine-free anti-fingerprint agent, which does not use fluorine-containing compounds, is low-cost, environmentally friendly and non-toxic; and has good thermal stability, and can form a coating with dense and uniform appearance, wear resistance and excellent anti-fingerprint performance on a substrate by vacuum evaporation or sputtering.

[0006] Another object of the present invention is to provide a method for preparing a fluorine-free anti-fingerprint agent, which has a simple and convenient preparation process, is easy to implement, does not use fluorine-containing compounds, and is safe and environmentally friendly.

[0007] Another object of the present invention is to provide an application of a fluorine-free anti-fingerprint agent, wherein the fluorine-free anti-fingerprint agent prepared by the present invention is deposited on the surface of a substrate by vacuum evaporation or magnetron sputtering to obtain a dense fluorine-free anti-fingerprint film with excellent anti-fingerprint performance.

[0008] The present invention is achieved through the following technical solutions:

[0009] A fluorine-free anti-fingerprint agent comprises the following components in parts by weight:

[0010] 100 parts of polysilane;

[0011] 5-15 parts of polysiloxane;

[0012] Catalyst 0.05-1 part;

[0013] 5-100 parts of diluent;

[0014] Wherein, the polysiloxane is a straight-chain polysiloxane, and one end of the polysiloxane includes one or more legs.

[0015] Furthermore, the multi-legged silane is a multi-legged silane based on an isocyanurate ring, and its structural formula is:

[0016]

[0017] Wherein, A can be selected from R 1 -[Si(OR 2 )3] m and R 3 -X-[R 4 -Si(OR 5 )3] n ;

[0018] R 1 A substituted or unsubstituted straight or branched chain alkyl group selected from 1 to 6 carbon atoms;

[0019] R 2 One selected from -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(═O)CH3, -C(CH3)═CH2, -N═C(CH3)CH3, -N═C(CH3)CH2CH3, m is 1 or 2;

[0020] R 3 A substituted or unsubstituted straight or branched chain alkyl group selected from 0 to 6 carbon atoms;

[0021] X is selected from -N(-)-, -NH-, -NHCH2CH2NH-, -S-, -OC(=O)CH2CH2N-, -OC(=O)CH2CH2NH-, -OC(=O)CH2CH2NHCH2C H2NH-, -OC(=O)CH2CH2S-, -OC(=O)CH2CH2-, -OC(=O)NH-, -OCH2CH(OH)CH2O-, -C(=O)N(-)-, -C(=O)N One or more of H-, -C(=O)NHCH2CH2NH-, -C(=O)OCH2CH(OH)CH2O-, -CH(OH)CHNH-, -CH(OH)CHN(-)-, -CH(OH)CHNHCH2CH2NH-, -CH(OH)CHS-, -NHC(=O)NH-, -NHC(=O)N(-)-, -NHC(=O)NHCH2CH2NH-, -NHC(=O)S-;

[0022] R 4 A substituted or unsubstituted straight-chain alkyl group selected from 0 to 6 carbon atoms;

[0023] R 5 Selected from one of -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(=O)CH3, -C(CH3)=CH2, -N=C(CH3)CH3, -N=C(CH3)CH2CH3, n is 1 or 2.

[0024] Furthermore, the side groups connected to the main chain silicon atoms of the polysiloxane are one or more selected from straight-chain or branched-chain alkyl groups with 1 to 18 carbon atoms.

[0025] Furthermore, the end-capping group at one end of the polysiloxane is a substituted or unsubstituted straight-chain or branched alkyl group with 1 to 6 carbon atoms, and the group at the other end is -R 6 -[Si(OR 7 )3] p or -R 8 -Y-[R 9 -Si(OR 10 )3] q ;

[0026] Among them, R 6 One selected from substituted or unsubstituted straight or branched chain alkyl groups having 1 to 6 carbon atoms;

[0027] R 7One selected from -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(=O)CH3, -C(CH3)=CH2, -N=C(CH3)CH3, -N=C(CH3)CH2CH3, p is an integer of 1-4;

[0028] R 8 is selected from one of substituted or unsubstituted straight or branched alkyl groups having 1 to 6 carbon atoms, and Y is selected from one or more of -S-, -OC(=O)NH-, -NHC(=O)NH-, -OCH2CH(OH)CH2O-, -NHCH(OH)CH2O-, -NHCH2CH2C(=O)O-;

[0029] R 9 is selected from a substituted or unsubstituted straight-chain or branched alkyl group having 0 to 6 carbon atoms, R 10 One selected from -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(=O)CH3, -C(CH3)=CH2, -N=C(CH3)CH3, -N=C(CH3)CH2CH3, q is an integer of 1-4.

[0030] It should be noted that the traditional fluorine-free anti-fingerprint agents synthesized based on polyurethane and fluorine-free anti-fingerprint agents based on acrylate monomers are usually unable to be vaporized or sputtered due to the large molecular weight of the polyurethane resin, excessive cohesive force, and strong intermolecular force; or due to their poor thermal stability, the carbon-carbon double bonds inside the molecules are easily reacted when heated, resulting in polymerization and cross-linking, and the inability to evaporate or the change of the evaporated material, resulting in reduced coating performance. Therefore, the traditional fluorine-free anti-fingerprint agent can only form an anti-fingerprint coating on the substrate by spraying, spin coating, etc. The anti-fingerprint film formed by this anti-fingerprint coating has low precision and poor film density, and cannot be further used in high-precision electronic products, which greatly limits the development and application of anti-fingerprint materials.

[0031] The anti-fingerprint agent system composed of the multi-legged silane based on isocyanurate ring and the polysiloxane including one or more legs at at least one end adopted in the present invention has strong thermal stability and appropriate molecular weight, which can ensure that the anti-fingerprint agent can be smoothly vaporized or sputtered to the surface of the substrate to form an anti-fingerprint film under vacuum evaporation or magnetron sputtering. The anti-fingerprint film has a good film structure, high film purity and density, and the coating formed by curing the material itself has good mechanical properties and exhibits excellent wear resistance.

[0032] Furthermore, the molecular weight of the polysiloxane is 1000-10000. Within this range, the prepared coating has outstanding anti-fingerprint performance and enhances wear resistance through lubrication.

[0033] Furthermore, the catalyst is selected from at least one of organic titanium, organic tin, organic bismuth and organic strong base catalyst.

[0034] Furthermore, the diluent is selected from one or more of ethyl acetate, butyl acetate, ethanol, isopropanol, propylene glycol methyl ether, propylene glycol methyl ether acetate, acetonitrile, and N,N-dimethylformamide.

[0035] Preferably, the fluorine-free anti-fingerprint agent comprises the following components in parts by weight:

[0036] 100 parts of polysilane based on isocyanurate;

[0037] 5-10 parts of polysiloxane having one or more legs at one end;

[0038] Catalyst 0.1-0.5 parts;

[0039] 20-50 parts of diluent.

[0040] A method for preparing a fluorine-free anti-fingerprint agent comprises the following steps:

[0041] S1: Synthesis of multi-legged silane and polysiloxane respectively;

[0042] S2: Mix multi-legged silane, polysiloxane and a catalyst, add a diluent and stir evenly to obtain a fluorine-free anti-fingerprint agent.

[0043] Furthermore, the synthesis steps of the polysilane in step S1 are: dissolving the isocyanurate cyclic compound in a solvent, then adding a silane coupling agent, and removing the solvent after the reaction is completed to obtain the polysilane.

[0044] Further, the isocyanurate cyclic compound is one or more of tris(2-hydroxyethyl)isocyanurate, tris(2-hydroxyethyl)isocyanuric acid triacrylate, triglycidyl isocyanurate, hexamethylene diisocyanate trimer, 1,3,5-tris(2-methylallyl)-1,3,5-triazine-2,4,6-trione, tris(2-carboxyethyl)isocyanurate, tris(2,3-dibromopropyl)isocyanurate, 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione and trichloroisocyanuric acid.

[0045] Further, the silane coupling agent is one or more of 3-isocyanatepropyltrimethoxysilane (IPTMS), bis(3-trimethoxysilylpropyl)amine (KH170), γ-aminopropyltriethoxysilane (KH550), trimethoxysilane, triethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0046] Furthermore, in step S1, the molar ratio of the isocyanurate cyclic compound to the silane coupling agent is 1:3.

[0047] Furthermore, the solvent is one or more of N,N-dimethylformamide, ethyl acetate, dimethyl sulfoxide, butyl acetate, ethanol, isopropanol, acetonitrile, propylene glycol methyl ether, and propylene glycol methyl ether acetate.

[0048] Furthermore, the synthesis step of the polysiloxane in step S1 is: mixing the single-end functionalized polysiloxane with the silane coupling agent, diluting with a diluent, and then adding a catalyst. After the reaction is completed, the solvent is removed to obtain the polysiloxane.

[0049] Furthermore, the reaction conditions in the polysiloxane synthesis step are: 50-80° C. for 18-30 hours.

[0050] Furthermore, the single-end functionalized polysiloxane is at least one of single-end hydroxyl polydimethylsiloxane, single-end bishydroxy polydimethylsiloxane, single-end epoxy polydimethylsiloxane, single-end amino polydimethylsiloxane, single-end hydrogen-containing polydimethylsiloxane, and single-end vinyl polydimethylsiloxane.

[0051] A fluorine-free anti-fingerprint film is prepared by depositing the fluorine-free anti-fingerprint agent on a substrate by vacuum evaporation or magnetron sputtering to form a fluorine-free anti-fingerprint coating, and then curing at high temperature to obtain the fluorine-free anti-fingerprint film.

[0052] Furthermore, the curing conditions of the fluorine-free anti-fingerprint film are: baking at 120-180° C. for 20-45 minutes.

[0053] In order to better understand and implement the present invention, the present invention is described in detail below in conjunction with specific embodiments. DETAILED DESCRIPTION

[0054] The technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] (1) Synthesis of polysilane

[0057] 0.05 mol of tris(2-hydroxyethyl)isocyanurate was dissolved in 50 g of DMF solvent, 0.05 mol of 3-isocyanatepropyltrimethoxysilane and 0.02 g of dibutyltin dilaurate were added, and the mixture was reacted at 60° C. for 24 h. The solvent was removed to obtain polysilane.

[0058] (2) Synthesis of polysiloxane

[0059] 4 g of mono-terminal hydroxyl polydimethylsiloxane with a molecular weight of 4000 and 1 mol of 3-isocyanatepropyltrimethoxysilane were mixed and diluted with ethyl acetate, and then 0.02 g of dibutyltin dilaurate was added, reacted at 60° C. for 24 hours, and the solvent was removed to obtain polysiloxane.

[0060] (3) Preparation of fluorine-free anti-fingerprint agent

[0061] Take 100 parts of the multi-legged silane obtained in step (1), 5 parts of the polysiloxane obtained in step (2), 0.1 parts of n-butyl titanate, and 20 parts of ethyl acetate and mix them to obtain a fluorine-free anti-fingerprint agent.

[0062] (4) Preparation of fluorine-free anti-fingerprint film

[0063] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (3) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to solidify to obtain a fluorine-free anti-fingerprint film F1.

[0064] Example 2

[0065] (1) Synthesis of polysilane

[0066] 0.05 mol of tris(2-hydroxyethyl)isocyanuric acid triacrylate was dissolved in 50 g of ethyl acetate, 0.15 mol of KH170 was added, and the mixture was reacted at 60° C. for 24 h. The solvent was removed to obtain multi-legged silane.

[0067] (2) Synthesis of polysiloxane

[0068] 4 g of mono-terminal hydroxyl polydimethylsiloxane with a molecular weight of 4000 and 1 mol of 3-isocyanatepropyltrimethoxysilane were mixed and diluted with ethyl acetate, and then 0.02 g of dibutyltin dilaurate was added, reacted at 60° C. for 24 hours, and the solvent was removed to obtain polysiloxane.

[0069] (3) Preparation of fluorine-free anti-fingerprint agent

[0070] 100 parts of the multi-legged silane obtained in step (1), 5 parts of the polysiloxane obtained in step (2), 0.1 parts of n-butyl titanate catalyst, and 30 parts of ethyl acetate were mixed to obtain a fluorine-free anti-fingerprint agent.

[0071] (4) Preparation of fluorine-free anti-fingerprint film

[0072] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (3) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to solidify to obtain a fluorine-free anti-fingerprint film F2.

[0073] Example 3

[0074] (1) Synthesis of polysilane

[0075] 0.05 mol of triglycidyl isocyanurate was dissolved in 100 g of dimethyl sulfoxide, 0.15 mol of KH170 was added, and the mixture was reacted at 100° C. for 24 h. The solvent was removed to obtain polysilane.

[0076] (2) Synthesis of polysiloxane

[0077] 4 g of mono-terminal hydroxyl polydimethylsiloxane with a molecular weight of 4000 and 1 mol of 3-isocyanatepropyltrimethoxysilane were mixed and diluted with ethyl acetate, and then 0.02 g of dibutyltin dilaurate was added, reacted at 60° C. for 24 hours, and the solvent was removed to obtain polysiloxane.

[0078] (3) Preparation of fluorine-free anti-fingerprint agent

[0079] Take 100 parts of the multi-legged silane obtained in step (1), 5 parts of the polysiloxane obtained in step (2), 0.05 parts of n-butyl titanate catalyst, and 20 parts of ethanol and mix them to obtain a fluorine-free anti-fingerprint agent.

[0080] (4) Preparation of fluorine-free anti-fingerprint film

[0081] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (3) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to solidify to obtain a fluorine-free anti-fingerprint film F3.

[0082] Example 4

[0083] (1) Synthesis of polysilane

[0084] 0.05 mol of hexamethylene diisocyanate trimer was dissolved in 50 g of ethyl acetate, and 0.15 mol of KH550 was slowly added dropwise under ice bath condition. After the addition was completed, the temperature was restored to room temperature and the reaction was continued for 2 h. The solvent was removed to obtain multi-legged silane.

[0085] (2) Synthesis of polysiloxane

[0086] 4 g of mono-terminal hydroxyl polydimethylsiloxane with a molecular weight of 4000 and 1 mol of 3-isocyanatepropyltrimethoxysilane were mixed and diluted with ethyl acetate, and then 0.02 g of dibutyltin dilaurate was added, reacted at 60° C. for 24 hours, and the solvent was removed to obtain polysiloxane.

[0087] (3) Preparation of fluorine-free anti-fingerprint agent

[0088] 100 parts of the multi-legged silane obtained in step (1), 15 parts of the polysiloxane obtained in step (2), 0.5 parts of n-butyl titanate catalyst, and 20 parts of ethanol were mixed to obtain a fluorine-free anti-fingerprint agent.

[0089] (4) Preparation of fluorine-free anti-fingerprint film

[0090] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (3) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to solidify to obtain a fluorine-free anti-fingerprint film F4.

[0091] Example 5

[0092] (1) Preparation of fluorine-free anti-fingerprint agent

[0093] 100 parts of 1,3,5-tris(3-(trimethoxysilyl)propyl)-1,3,5-triazine-2,4,6-trione, 5 parts of the polysiloxane prepared in Example 1, 0.1 parts of n-butyl titanate catalyst, and 10 parts of ethyl acetate were mixed to obtain a fluorine-free anti-fingerprint agent.

[0094] (2) Preparation of fluorine-free anti-fingerprint film

[0095] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (1) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to solidify to obtain a fluorine-free anti-fingerprint film F5.

[0096] Comparative Example 1

[0097] (1) Preparation of fluorine-free anti-fingerprint agent

[0098] 100 parts of an isocyanate-terminated polyurethane resin having a number average molecular weight of 2000 and 100 parts of ethyl acetate were mixed uniformly to obtain a fluorine-free anti-fingerprint agent.

[0099] (2) Preparation of fluorine-free anti-fingerprint film

[0100] 0.8 g of the fluorine-free anti-fingerprint agent prepared in step (1) was added to a crucible to prepare pills, which could not be deposited on a glass substrate to form a coating by vacuum evaporation.

[0101] Comparative Example 2

[0102] (1) Preparation of fluorine-free anti-fingerprint agent

[0103] 100 parts of KH170, 5 parts of the polysiloxane prepared in Example 1, 0.1 parts of n-butyl titanate catalyst, and 10 parts of ethyl acetate were mixed to obtain a fluorine-free anti-fingerprint agent.

[0104] (2) Preparation of fluorine-free anti-fingerprint film

[0105] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (1) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to obtain a fluorine-free anti-fingerprint film F7.

[0106] Comparative Example 3

[0107] (1) Preparation of fluorine-free anti-fingerprint agent

[0108] 100 parts of the multi-legged silane prepared in Example 1, 0.1 parts of n-butyl titanate catalyst, and 20 parts of ethyl acetate were mixed to obtain a fluorine-free anti-fingerprint agent.

[0109] (2) Preparation of fluorine-free anti-fingerprint film

[0110] 0.5 g of the fluorine-free anti-fingerprint agent prepared in step (1) was added dropwise into a crucible to prepare a pill, which was deposited on a glass substrate by vacuum evaporation to form a coating, and then baked at 150° C. for 30 min to obtain a fluorine-free anti-fingerprint film F8.

[0111] Performance Testing

[0112] The fluorine-free anti-fingerprint films prepared in Examples 1-5 and Comparative Examples 1-3 were subjected to water contact angle test, abrasion test (dust-free cloth, 1 kg load, 1×1 grinding head, 1000 back and forth), pencil hardness test (750 g load) and marker pen line test. The results are shown in Table 1.

[0113] Table 1 Performance test data of fluorine-free anti-fingerprint films prepared in Examples 1-5 and Comparative Examples 1-3

[0114]

[0115] As can be seen from Table 1, the anti-fingerprint agent systems of Examples 1-5 use multi-legged silanes based on isocyanurate rings and polysiloxanes with at least one leg. These anti-fingerprint agents can be deposited on substrates by vacuum evaporation to form anti-fingerprint films with uniform thickness and good density, and exhibit excellent wear resistance and anti-fouling properties.

[0116] The polyurethane resin used in Comparative Example 1 cannot be evaporated to form a coating due to its excessive cohesive force.

[0117] Compared with Example 1, since Comparative Example 2 does not contain an isocyanurate ring in its molecular structure, the coating obtained by vacuum evaporation has low hardness and exhibits poor wear resistance.

[0118] Compared with Example 1, since polysiloxane is not introduced into the anti-fingerprint agent system of Comparative Example 3, the anti-fingerprint film obtained by vacuum evaporation has poor anti-fouling ability and exhibits poor anti-fingerprint performance.

[0119] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A fluorine-free anti-fingerprint agent, characterized in that: The composition comprises the following components in parts by weight: 100 parts of polysilane; 5-15 parts of polysiloxane; Catalyst 0.05-1 part; 5-100 parts of diluent; The polysiloxane is a straight-chain polysiloxane, and one end of the polysiloxane includes one or more legs.

2. The fluorine-free anti-fingerprint agent according to claim 1, characterized in that: The multi-legged silane is a multi-legged silane based on an isocyanurate ring, and its structural formula is: Wherein A can be selected from R 1 -[Si(OR 2 )3] m and R 3 -X-[R 4 -Si(OR 5 )3] n ; R 1 A substituted or unsubstituted straight or branched chain alkyl group selected from 1 to 6 carbon atoms; R 2 One selected from -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(═O)CH3, -C(CH3)═CH2, -N═C(CH3)CH3, -N═C(CH3)CH2CH3, m is 1 or 2; R 3 A substituted or unsubstituted straight or branched chain alkyl group selected from 0 to 6 carbon atoms; X is selected from -N(-)-, -NH-, -NHCH2CH2NH-, -S-, -OC(=O)CH2CH2N-, -OC(=O)CH2CH2NH-, -OC(=O)CH2CH2NHCH2C H2NH-, -OC(=O)CH2CH2S-, -OC(=O)CH2CH2-, -OC(=O)NH-, -OCH2CH(OH)CH2O-, -C(=O)N(-)-, -C(=O)N One or more of H-, -C(=O)NHCH2CH2NH-, -C(=O)OCH2CH(OH)CH2O-, -CH(OH)CHNH-, -CH(OH)CHN(-)-, -CH(OH)CHNHCH2CH2NH-, -CH(OH)CHS-, -NHC(=O)NH-, -NHC(=O)N(-)-, -NHC(=O)NHCH2CH2NH-, -NHC(=O)S-; R 4 A substituted or unsubstituted straight-chain alkyl group selected from 0 to 6 carbon atoms; R 5 Selected from one of -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(=O)CH3, -C(CH3)=CH2, -N=C(CH3)CH3, -N=C(CH3)CH2CH3, n is 1 or 2.

3. The fluorine-free anti-fingerprint agent according to claim 1, characterized in that: The side groups connected to the main chain silicon atoms of the polysiloxane are one or more selected from linear or branched alkyl groups with 1 to 18 carbon atoms.

4. The fluorine-free anti-fingerprint agent according to claim 3, characterized in that: The end-capping group at one end of the polysiloxane is a substituted or unsubstituted straight-chain or branched alkyl group with 1 to 6 carbon atoms, and the group at the other end is -R 6 -[Si(OR 7 )3] p or -R 8 -Y-[R 9 -Si(OR 10 )3] q ; Among them, R 6 One selected from substituted or unsubstituted straight or branched chain alkyl groups having 1 to 6 carbon atoms; R 7 One selected from -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(=O)CH3, -C(CH3)=CH2, -N=C(CH3)CH3, -N=C(CH3)CH2CH3, p is an integer of 1-4; R 8 is selected from one of substituted or unsubstituted straight or branched alkyl groups having 1 to 6 carbon atoms, and Y is selected from one or more of -S-, -OC(=O)NH-, -NHC(=O)NH-, -OCH2CH(OH)CH2O-, -NHCH(OH)CH2O-, -NHCH2CH2C(=O)O-; R 9 is selected from a substituted or unsubstituted straight-chain or branched alkyl group having 0 to 6 carbon atoms, R 10 One selected from -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -C(=O)CH3, -C(CH3)=CH2, -N=C(CH3)CH3, -N=C(CH3)CH2CH3, q is an integer of 1-4.

5. The fluorine-free anti-fingerprint agent according to claim 4, characterized in that: The molecular weight of the polysiloxane is 1000-10000.

6. The fluorine-free anti-fingerprint agent according to claim 1, characterized in that: The catalyst is selected from at least one of organic titanium, organic tin, organic bismuth and organic strong base catalyst.

7. The fluorine-free anti-fingerprint agent according to claim 1, characterized in that: The diluent is selected from one or more of ethyl acetate, butyl acetate, ethanol, isopropanol, propylene glycol methyl ether, propylene glycol methyl ether acetate, acetonitrile, and N,N-dimethylformamide.

8. A method for preparing the fluorine-free anti-fingerprint agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Synthesis of multi-legged silane and polysiloxane respectively; S2: Mix multi-legged silane, polysiloxane and a catalyst, add a diluent and stir evenly to obtain a fluorine-free anti-fingerprint agent.

9. The method for preparing a fluorine-free anti-fingerprint agent according to claim 8, characterized in that: The synthesis steps of the polysilane in step S1 are: dissolving the isocyanurate cyclic compound in a solvent, then adding a silane coupling agent, and removing the solvent after the reaction to obtain the polysilane.

10. A fluorine-free anti-fingerprint film, characterized in that: The fluorine-free anti-fingerprint agent according to any one of claims 1 to 7 is deposited on a substrate by vacuum evaporation or magnetron sputtering to form a fluorine-free anti-fingerprint coating, and then cured at high temperature to obtain a fluorine-free anti-fingerprint film.

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