Crosslinking coating for the surface of rubber articles, method of preparation and use

Abstract

The application discloses a kind of crosslinking coating for rubber product surface anti-adhesion durable lubrication, using the good bonding performance of fluorine rubber, polyurethane itself, can give coating better adhesion, impact resistance, weather resistance, resistance to chemicals and other properties;Using the characteristics of water-based polyurethane deblocking when heated at high temperature, crosslinking occurs, add liquid fluorine rubber containing hydroxyl group to promote polyurethane coating and natural rubber through covalent bond connection, firmly cover on the surface of rubber product, increase the durability of coating;Carboxyl-terminated liquid fluorine rubber and the carboxyl-terminated liquid fluorine rubber prepared after further reduction thereof are copolymerized to occur esterification reaction;Polyurethane, carboxyl-terminated liquid fluorine rubber and isocyanate curing agent react, and multiple crosslinking network structure is constructed among polyurethane and liquid fluorine rubber, rubber, and the network structure also interacts to play a synergistic effect, improve the mechanical properties of coating and the adhesion and mechanical properties on the surface of rubber product.

Description

Technical Field

[0001] This invention relates to the field of cross-linked coating preparation technology for rubber surfaces, and more specifically to a cross-linked coating for anti-adhesion and long-lasting lubrication of rubber product surfaces, its preparation method, and its application. Background Technology

[0002] Due to the inherent self-adhesive properties of natural rubber and other synthetic rubber materials, the production of rubber gloves, stoppers, sheets, and hoses currently requires the use of calcium carbonate, talc, or modified starch as release agents, or chlorination processes such as chlorine gas or sodium hypochlorite, to improve surface lubricity and address issues of adhesion, wearing comfort, and efficiency during the production, storage, and use of gloves and other products. These methods, however, generate significant amounts of dust, wastewater, and air pollution.

[0003] To achieve powder-free production, two problems need to be solved: first, the adhesion between the inner and outer surfaces of the product and between products during the production process; second, ensuring a smooth surface under both dry and humid conditions to guarantee wearability and comfort. Surface modification is an effective way to improve or enhance the surface properties of materials, endowing the material surface with new properties and functions while maintaining its original basic physicochemical properties. Surface modification methods are divided into surface chemical modification and physical coating. The former only improves the rubber surface, and the modified surface layer is easily worn after treatment, with a limited service life; the latter, physical coating, mainly involves coating the product surface with polymer coatings, such as polyurethane. Conventional polymer-coated gloves are produced by coating the inner surface of the glove with a polymer coating, thereby obtaining a smooth surface that is easy to wear and improving hand comfort. Polyurethane is a polymer resin with repeating (-NH-COO-) units in its main chain, and it has outstanding advantages such as high strength, good wear resistance, strong adhesion, good low-temperature resistance, and adjustable hardness. In particular, the introduction of hydrophilic groups during the polymerization process of polyurethane makes the polyurethane macromolecules hydrophilic. Waterborne polyurethane resin, when applied to the inner layer of gloves, can replace powdered lubricants and release agents such as starch or talcum powder. Applying it to the outer layer can improve the gloves' abrasion resistance, breathability, and softness. However, these coatings are difficult to bond strongly to the surface of the product, and they are prone to peeling off during use. Under suitable conditions, the carboxyl and hydroxyl groups in waterborne polyurethane can participate in reactions to produce cross-linking.

[0004] Therefore, how to provide a more effective and durable coating for rubber products to solve the problem of adhesion during product manufacturing, improve surface lubrication, and enhance wearability is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a crosslinked coating for anti-adhesion and long-lasting lubrication of rubber product surfaces. The crosslinked coating, which is produced with polyurethane and fluororubber as the core materials, is a medium-resistant and long-lasting lubricating material. It is an effective alternative to chlorine treatment or powder production methods. While solving the problem of surface lubrication and improving wearability, it can also give the product superior surface properties.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A crosslinking coating for the surface of rubber products comprises, by weight, the following raw materials: 20-40 parts of aqueous polyurethane emulsion, 10-30 parts of liquid hydroxyl-terminated fluororubber, 3-15 parts of curing agent, 1-10 parts of aqueous silicone emulsion, 1-10 parts of wax emulsion, 1-10 parts of polyquaternary ammonium salt, and 5-10 parts of nonionic surfactant, and 100-200 parts of water.

[0008] Fluororubber is a synthetic polymer elastomer in which fluorine atoms are bonded to the carbon atoms of the main chain or side chains. The introduction of fluorine atoms endows the rubber with excellent heat resistance, weather resistance, oxidation resistance, radiation resistance, solvent resistance, and media resistance, making it an indispensable material in modern aerospace, military defense, automotive, petrochemical, and other cutting-edge technologies. Liquid fluororubber has a significantly lower molecular weight, improving its processing performance. Utilizing the excellent properties of fluororubber and the ease of processing liquid fluororubber, it can be coated or impregnated onto various substrates such as fabrics, fibers, metals, plastics, rubber, and others, modifying the surface of the latter and providing the protective properties of fluororubber. For low molecular weight polymers, end groups can significantly affect their properties, especially thermal stability and curing performance. Liquid carboxyl-terminated fluororubber chains contain unsaturated double bonds. Under high-temperature conditions, the end-carboxyl groups of carboxyl-terminated liquid fluororubber undergo degradation reactions, which affects the service life of the liquid fluororubber product. Therefore, it is necessary to reduce the end carboxyl groups to end hydroxyl groups.

[0009] Preferably, the curing agent includes isocyanate compounds, aziridine, or polycarbodiimide, all of which can cure crosslinked waterborne polyurethane and liquid fluororubber. Based on a total mass fraction of 100 parts of polyurethane and fluororubber, the amount of curing agent added is 3-10 parts.

[0010] Isocyanate curing agents contain highly reactive isocyanate groups, which can react with active hydrogen groups such as carboxyl, hydroxyl, ammonia, urethane, and urea groups in polymers to achieve cross-linking and obtain polymers with a network structure.

[0011] Preferably, the isocyanate compounds include hexamethylene diisocyanate (HDI) and dicyclohexylmethane diisocyanate (HMDI); the diisocyanates include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI) or lysine diisocyanate (LDI).

[0012] Furthermore, hexamethylene diisocyanate (HDI) and commonly used diisocyanate (MDI) are preferred, with HDI, which has good hydrophilicity, being even more preferred.

[0013] Organosilicon emulsions are used as slip agents to improve sliding properties and reduce surface friction; they also act as surfactants, providing emulsification and dispersion. Organosilicon emulsions refer to oil-in-water emulsions composed of silicone oil, various surfactants, and water, including: hydroxyl-terminated polydimethylsiloxane and its derivatives (with other active functional groups introduced into the molecule, such as amino, amide, ester, cyano, carboxyl, epoxy, or organofluorine modified emulsions), resin-based organosilicon (polymethyl silicone resin, methyl-phenyl silicone resin) emulsions, and any combination of other organosilicon emulsions used as textile finishing agents; commonly used polydimethylsiloxane emulsions are preferred.

[0014] The polyquaternary ammonium salt possesses excellent antistatic, antibacterial, emulsifying, dispersing, thickening, and film-forming properties. Preferably, the polyquaternary ammonium salt is a dual long-chain quaternary ammonium salt, including any one or a combination of several of the following polyquaternary ammonium salts: hexadecyl dimethyl benzyl ammonium chloride, bis(decyl) dimethyl ammonium chloride, laurylamine dipropylenediamine, polydimethyl diallyl ammonium chloride (polyquaternary ammonium salt-6), dimethyl diallyl ammonium chloride-acrylamide copolymer (polyquaternary ammonium salt-7), and N,N,N-trimethyl-2-(2-methyl-1-oxo-2-propenyloxy)ethyl ammonium chloride-acrylamide copolymer (polyquaternary ammonium salt-15).

[0015] The nonionic emulsifier is dodecylphenol polyoxyethylene ether (OP-10) or Pingping plus "O".

[0016] As having the same inventive concept as the above-described technical solution, this invention also claims protection for a method for preparing the above-described crosslinked coating, the method comprising the following steps:

[0017] 1) Liquid-terminated hydroxyl-terminated fluororubber was prepared by reduction of liquid-terminated carboxyl-terminated fluororubber;

[0018] 2) Dissolve the liquid-terminated hydroxyl fluororubber in acetone according to the weight ratio, and then weigh out a portion of the curing agent and dissolve it in the above mixture to form an oil phase for later use;

[0019] 3) Dissolve the nonionic emulsifier dodecylphenol polyoxyethylene ether (OP-10) or Pingpingjia "O" in water to form an aqueous phase. Then mix the oil phase and the aqueous phase and stir at room temperature for 5-20 minutes. Use a high-speed mixer to stir at 10,000-12,000 rpm for 10 minutes to emulsify the above mixture to obtain a microemulsion, and let it stand at room temperature to defoam. The nonionic emulsifier includes dodecylphenol polyoxyethylene ether (OP-10) or Pingpingjia "O".

[0020] 4) Then, according to the composition, mix the waterborne polyurethane emulsion, the remaining curing agent, the waterborne organosiloxane, the nonionic surfactant, the polyquaternary ammonium salt, and the remaining distilled water, and stir at a speed of 2000-3000 rpm to obtain a milky white viscous liquid, which is the crosslinking coating.

[0021] Preferably, the preparation process of liquid-terminated hydroxyl fluororubber is as follows: sodium borohydride and samarium chloride (NaBH4 / SmCl3) are used as the reduction system, and LTCFs are reduced to liquid-terminated hydroxyl fluororubber (LTHFs) in a one-pot method. According to literature, the preparation method includes the following steps: 50.0 g (carboxyl content of 2.8 mmol) of LTCFs is dissolved in a mixture of 150 mL THF and 150 mL diethylene glycol dimethyl ether (ratio of 1:1); the reaction temperature is controlled at 0℃, NaBH4 is added to the reaction vessel, followed by 50.0 g of LTCFs solution, and the mixture is stirred for 1 h; then, the appropriate amount of SmCl3 is added according to the ratio of n(COOH) / n(NaBH4) / n(SmCl3) = 1 / 4 / 2, and after mixing evenly, the temperature is raised to 90℃ and the reaction is carried out for 6 h; after the reaction is completed, 100 mL of 2.0 mol / L hydrochloric acid is added to quench the reaction, the product is repeatedly washed with deionized water, and vacuum dried at 60-65℃ to constant weight. Finally, the clean precipitate is dried to obtain a milky white or even light yellow viscous product LTHFs. (Li Xueyan. Study on liquid carboxyl-terminated fluororubber reduced by sodium borohydride / rare earth chloride and its curing [D]. Dalian Maritime University: 2020)

[0022] The carboxyl-terminated liquid fluororubber used in this invention is a vinylidene fluoride-tetrafluoroethylene copolymer, a vinylidene fluoride-monochlorotrifluoroethylene copolymer, a vinylidene fluoride-perfluoromethyl vinyl ether copolymer, a vinylidene fluoride-hexafluoropropylene copolymer, a vinylidene fluoride-perfluoroethyl vinyl ether copolymer, a vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, a vinylidene fluoride-propylene-tetrafluoroethylene terpolymer, or a vinylidene fluoride-tetrafluoroethylene-perfluoroethyl vinyl ether terpolymer.

[0023] As having the same inventive concept as the above-described technical solution, this invention also claims protection for the application of the crosslinked coating prepared by the method in the preparation of rubber gloves.

[0024] Preferably, the specific process is as follows:

[0025] First, dilute the coating to 1%–5%. Immerse the rubber product in the diluted water-based polyurethane-liquid fluororubber coating solution for 5–20 minutes, then remove it. Alternatively, spray the coating onto the surface of the rubber product 2–10 times. Then, heat it at 90–120℃ for 0.5–2 hours to allow the polyhydroxy fluororubber, polyurethane, and rubber to crosslink and cure, forming a multi-layered crosslinked network. Finally, wash with deionized water to obtain a rubber product with a durable lubricating layer on the surface.

[0026] As can be seen from the above technical solution, the technical effect achieved by the present invention is as follows:

[0027] Polyurethane-fluororubber coating materials, produced using waterborne polyurethane and liquid fluororubber as the main raw materials, can prevent self-adhesion during the production of rubber products by waterborne polyurethane, organosiloxane, and polyquaternary ammonium salts, and can replace chlorine treatment or powder production processes.

[0028] Due to the coating of polyurethane and fluororubber materials, after drying, a multi-crosslinked network structure is formed to firmly create a protective film on the surface of the product. This leverages the inherent properties of polyurethane, fluororubber, and organosiloxanes to effectively improve surface lubricity, thus providing a lasting improvement in the comfort of wearing gloves and the smoothness of general products.

[0029] Furthermore, the coating effectively isolates the wearer or user from the product, preventing contact with proteins and other accelerators that may migrate from the natural rubber-based product itself, thus avoiding allergic reactions and inflammation at the contact site. Simultaneously, the polyquaternium salt component in the coating has antibacterial and antistatic properties, enhancing product safety.

[0030] In summary, compared with the prior art, the coating of the present invention has superior overall performance. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 The attached figures are photographs of the coatings; (a) an uncoated natural rubber surface; (b) a natural rubber surface with a commercially available silicone-coated TiO2-polyacrylic emulsion coating; and (c) a natural rubber surface (1 mm) with the fluororubber-polyurethane coating of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Preparation of liquid-terminated hydroxyl fluororubber from liquid-terminated carboxyl fluororubber by reduction

[0035] Based on the references, the optimal existing process route was selected for conversion. Using liquid hydroxyl-terminated fluororubber (LTCFs) as raw material and sodium borohydride and samarium chloride (NaBH4 / SmCl3) as the reduction system, LTCFs were reduced to liquid hydroxyl-terminated fluororubber (LTHFs) in a one-pot process.

[0036] The preparation method includes the following steps: 50.0 g (carboxyl content 2.8 mmol) of LTCFs is dissolved in a mixture of 150 mL THF and 150 mL diethylene glycol dimethyl ether (ratio 1:1); the reaction temperature is controlled at 0℃, NaBH4 is added to the reaction vessel, followed by 50.0 g of LTCFs solution, and the mixture is stirred for 1 h; then, the appropriate amount of SmCl3 is added according to the ratio of n(COOH) / n(NaBH4) / n(SmCl3) = 1 / 4 / 2, and after uniform mixing, the temperature is raised to 90℃ and the reaction is carried out for 6 h; after the reaction is completed, 100 mL of 2.0 mol / L hydrochloric acid is added to quench the reaction, the product is repeatedly washed with deionized water, and vacuum dried at 60-65℃ to constant weight. Finally, the clean precipitate is dried to obtain a milky white or even pale yellow viscous product LTHFs, which is ready for use. According to literature, the reduction rate (carboxyl conversion rate) of terminal carboxyl fluororubber under these conditions reaches over 90%.

[0037] The coating was prepared using methods described in Examples 2-4.

[0038] Example 2

[0039] A lubricating coating for the surface of a natural rubber product, comprising, by weight, 30 parts of an aqueous polyurethane emulsion, 20 parts of liquid hydroxyl-terminated fluororubber, 100 parts of acetone solution, 6 parts of curing agent hexamethylene diisocyanate (HDI), 10 parts of polydimethylsiloxane silicone emulsion, 2 parts of wax emulsion, 5 parts of antibacterial agent polyquaternium-7M550, 5 parts of nonionic surfactant OP-10, and 150 parts of distilled water.

[0040] First, dissolve 20 parts of liquid hydroxyl-terminated fluororubber in 100 parts of acetone according to the following ratio. Then, weigh out 2 parts of the curing agent (10:100 ratio of curing agent to fluororubber) and dissolve them in the above mixture to form the oil phase. Next, dissolve 5 parts of nonionic emulsifier OP-10 in 100 parts of water to form the aqueous phase. Then, mix the oil phase and the aqueous phase and stir at room temperature for 5–20 minutes. Use a high-speed mixer to...

[0041] Stir at 10,000-12,000 rpm for 10 minutes to emulsify the above mixture into a microemulsion, and let it stand at room temperature to defoam; then mix 30 parts of waterborne polyurethane emulsion, 4 parts of the remaining curing agent, 10 parts of waterborne organosiloxane, 5 parts of polyquaternium salt-7M-550, and about 50 parts of the remaining distilled water, and stir evenly at 3,000 rpm to obtain a milky white waterborne polyurethane-fluororubber coating mixture.

[0042] The above emulsion was prepared into a 5% solution, and the newly prepared and shaped latex sheet was immersed in it for 8 minutes. After immersion, it was taken out and dried in an oven at 110°C for 2 hours to obtain a natural rubber sheet with a polyurethane-fluororubber cross-linked coating.

[0043] Example 3

[0044] A lubricating coating for the surface of a natural rubber product, comprising, by weight parts, 30 parts of an aqueous polyurethane emulsion, 30 parts of liquid hydroxyl-terminated fluororubber, 150 parts of acetone solution, 8 parts of curing agent hexamethylene diisocyanate (HDI), 8 parts of polydimethylsiloxane silicone emulsion, 2 parts of wax emulsion, 10 parts of antibacterial agent polyquaternium-7M-550, 7 parts of nonionic surfactant OP-10, and 150 parts of distilled water.

[0045] First, dissolve 30 parts of liquid hydroxyl-terminated fluororubber in 150 parts of acetone emulsion according to the following proportions. Then, weigh out 5 parts of curing agent and dissolve them in the above mixture at a ratio of 15:100 to form the oil phase. Dissolve 5 parts of nonionic emulsifier OP-10 in 100 parts of distilled water to form the aqueous phase. Then, mix the oil phase and the aqueous phase and stir at room temperature for 5-20 minutes. Use a high-speed mixer to stir at 10,000-12,000 rpm for 10 minutes to emulsify the above mixture to obtain a microemulsion, and let it stand at room temperature to defoam. Then, mix 30 parts of waterborne polyurethane emulsion, the remaining 3 parts of curing agent HDI, 8 parts of waterborne organosiloxane, 10 parts of polyquaternium-7M-550, 2 parts of Pingpingjia O, and the remaining approximately 50 parts of distilled water according to the composition and stir evenly at 2500 rpm to obtain a milky white waterborne polyurethane-fluororubber coating mixture.

[0046] The above emulsion was prepared into a 5% solution, and the newly prepared and shaped latex sheet was immersed in it. After immersion for 10 minutes, it was taken out and dried in an oven at 110°C for 2 hours to obtain a rubber sheet with a polyurethane-fluororubber crosslinking coating.

[0047] Example 4

[0048] A lubricating coating for the surface of a natural rubber product, comprising, by weight, 20 parts of an aqueous polyurethane emulsion, 20 parts of liquid hydroxyl-terminated fluororubber, 150 parts of acetone solution, 6 parts of curing agent hexamethylene diisocyanate (HDI), 10 parts of polydimethylsiloxane silicone emulsion, 2 parts of oxidized polyethylene wax emulsion, 5 parts of antibacterial agent polyquaternium salt-7M-550, 5 parts of nonionic surfactant (Pingping plus "O"), and 150 parts of distilled water.

[0049] First, dissolve 20 parts of liquid hydroxyl-terminated fluororubber in 150 parts of acetone according to the following proportions. Then, weigh out 3 parts of curing agent HDI and dissolve it in the above mixture at a ratio of curing agent to fluororubber of 15:100 to form the oil phase. Dissolve the nonionic emulsifier Pingpingjia "O" in 100 parts of water to form the aqueous phase. Then, mix the oil phase and the aqueous phase and stir at room temperature for 5-20 minutes. Use a high-speed mixer to stir at a speed of 10,000-12,000 rpm for 10 minutes to emulsify the above mixture to obtain a microemulsion, and let it stand at room temperature to defoam. Then, mix 20 parts of waterborne polyurethane emulsion, 3 parts of curing agent HDI, 10 parts of waterborne organosiloxane, 5 parts of polyquaternary ammonium salt M-550, and about 50 parts of the remaining distilled water, and stir evenly at a speed of 3,000 rpm to obtain a milky white waterborne polyurethane-fluororubber coating mixture.

[0050] The above emulsion was prepared into a 5% solution, and the newly prepared latex sheet was immersed in it for 6 minutes. After immersion, it was taken out and dried in an oven at 110°C for 2 hours to obtain a natural rubber sheet with a polyurethane-fluororubber cross-linked coating.

[0051] Comparative Example 1

[0052] A 5% solution was prepared using a silicone-coated TiO2-polyacrylate emulsion produced by a certain company as a release agent. The newly prepared and shaped latex sheet was immersed in the solution for 20 minutes, then removed and dried in an oven at 110°C for 2 hours to obtain a natural rubber sheet with a silicone-coated TiO2-polyacrylic acid emulsion coating.

[0053] Application Evaluation:

[0054] The coatings prepared in Example 3 and Comparative Example 1 were imaged under a conventional optical microscope (magnification 250x). See [image]. Figure 1It is evident that the waterborne polyurethane-fluororubber coating mixture forms a smooth coating on the surface of rubber products, which is superior to existing technologies.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A crosslinking coating for the surface of rubber products, characterized in that, The raw materials are formulated according to the following weight ratio: 20-40 parts of waterborne polyurethane emulsion, 10-30 parts of liquid hydroxyl-terminated fluororubber, 100-200 parts of acetone solution, 3-10 parts of curing agent, 1-10 parts of waterborne silicone emulsion, 1-10 parts of wax emulsion, 1-10 parts of polyquaternary ammonium salt and 5-10 parts of nonionic surfactant, and 100-150 parts of water; The curing agent includes isocyanate compounds, aziridine, or polycarbodiimide; The isocyanate compound is hexamethylene diisocyanate; The aqueous silicone emulsion is a polydimethylsiloxane emulsion; The nonionic surfactant is dodecylphenol polyoxyethylene ether or a compound surfactant with "O" added. The waxy emulsion includes any one or a combination of several of the following: polyethylene wax emulsion, paraffin microemulsion, carnauba wax emulsion, polypropylene wax emulsion, polyamide wax emulsion, and polytetrafluoroethylene wax. The polyquaternary ammonium salt is a dual long-chain quaternary ammonium salt, including any one or a combination of several of hexadecyl dimethyl benzyl ammonium chloride, didecyl dimethyl ammonium chloride, laurylamine dipropylenediamine, polydimethyl diallyl ammonium chloride, dimethyl diallyl ammonium chloride-acrylamide copolymer, and polyquaternary ammonium salt-15.

2. The method for preparing a crosslinked coating for the surface of rubber products according to claim 1, characterized in that, The process includes the following: 1) Liquid-terminated hydroxyl-terminated fluororubber was prepared by reduction of liquid-terminated carboxyl-terminated fluororubber; 2) Dissolve the liquid-terminated hydroxyl fluororubber in acetone solution according to the weight parts, and then weigh out a portion of the curing agent and dissolve it in the above mixture to form an oil phase for later use; 3) Dissolve 5-10 parts of the nonionic surfactant alkylphenol polyoxyethylene ether OP-10 or Pingpingjia "O" in 50-100 parts of water to form an aqueous phase. Then mix the oil phase and the aqueous phase and stir at room temperature for 5-20 minutes. Use a high-speed mixer to stir at 10000-12000 rpm for 10 minutes to emulsify the above mixture to obtain a microemulsion, and let it stand at room temperature to defoam. The nonionic surfactant is alkylphenol polyoxyethylene ether OP-10 or Pingpingjia "O". 4) Then mix the waterborne polyurethane emulsion, the remaining curing agent, the waterborne organosiloxane, the polyquaternary ammonium salt, and the remaining distilled water, and stir evenly at a speed of 2000-3000 rpm to obtain a milky white viscous liquid, which is the coating composite.

3. The application of the coating composite prepared by the method of claim 2 in the preparation of rubber gloves.

4. The application according to claim 3, characterized in that, The specific process is as follows: First, dilute the coating to 1% to 5%, then immerse the rubber product in the diluted water-based polyurethane-liquid fluororubber coating composite for 5 to 20 minutes and then remove it; or spray the coating 2 to 10 times on the surface of the rubber product, then heat it at 90 to 120°C for 0.5 to 2 hours, and then clean it with deionized water to obtain a rubber product with a durable lubricating coating on the surface.

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