Allergy-free easy-to-separate coating for latex gloves

Abstract

The invention discloses an allergy-free easily-separated coating for latex gloves, which belongs to the technical field of coatings and comprises the following raw materials in parts by weight: 15-35 parts of polyurethane emulsion PUD-336, 0.1-1 part of a thickening agent, 0.1-1 part of a flatting agent, 1-5 parts of polyethylene wax, 0.1-0.5 part of a defoaming agent and 3-6 parts of functional filler. The coating is used for latex gloves and can prevent allergy caused by the latex gloves, polyurethane is used as a matrix, the coating is endowed with excellent antibacterial and easy-release properties by adding a functional filler, a prepolymer is firstly prepared in the preparation process of the functional filler and is a polymer with an amino structure, and then amino on the prepolymer and gamma-(2, 2, 6, 6-tetramethyl-4-piperidyl)-2, 2, 6-tetramethyl-4-piperidyl-2, 6-tetramethyl-4-piperidyl-2, 6-tetramethyl-4-piperidyl-2, 6- The preparation method comprises the following steps: carrying out a reaction on an epoxy group on 2, 3-epoxypropoxy) propyltrimethoxysilane to prepare a modifier, hydrolyzing a siloxane structure on the modifier, polymerizing the hydrolyzed siloxane structure with a hydroxyl group on the surface of titanium dioxide, and grafting the modifier on the surface of titanium dioxide.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to an anti-allergic and easy-to-detach coating for latex gloves. Background Art

[0002] Latex thin-layer gloves are commonly used in the medical industry, the electronics industry, the food industry, etc. The source of natural latex is the latex secreted by rubber trees, which is rich in plant protein. Some Caucasians are allergic to the protein in natural latex, which causes discomfort when wearing. In severe cases, it causes allergies and even leads to chain diseases. Therefore, there is a certain demand for anti-allergic gloves in the European and American markets. In addition, natural latex thin-layer gloves are self-adhesive and not easy to put on and take off. Therefore, they need to be designed into gloves with a smooth surface and easy to put on and take off. At present, latex gloves products using new surface treatment technology only play an isolation role. How to isolate the contact between the hands and the outside world and have antibacterial and bactericidal functions is a direction that needs to be studied.

[0003] Nano-titanium dioxide has excellent photocatalytic activity, high chemical stability, is safe and harmless to the human body, and has low cost. It is an ideal inorganic antibacterial agent. However, how to evenly disperse it in the coating and improve the antibacterial properties it imparts to the coating remains a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an anti-allergic and easy-to-detach coating for latex gloves.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An anti-allergic and easy-to-detach coating for latex gloves comprises the following raw materials in parts by weight: 15-35 parts of polyurethane emulsion PUD-336, 0.1-1 parts of thickener, 0.1-1 parts of leveling agent, 1-5 parts of polyethylene wax, 0.1-0.5 parts of defoamer, and 3-6 parts of functional filler; The functional filler is prepared by the following steps: Step S1, adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine to a 15% volume fraction ethanol aqueous solution, heating to 50-65° C., adding a catalyst, stirring at a uniform speed and reacting for 36-54 hours, and obtaining a prepolymer after the reaction is completed, wherein the weight ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-(3-trimethoxysilylethyl)ethylenediamine and ethanol aqueous solution is controlled to be 5-10:10-15:30-50, and the amount of the catalyst is 3-5% of the weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine; In step S1, the siloxane on dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine is hydrolyzed into hydroxyl groups and then condensed to prepare a prepolymer, which is a polymer with an amino structure; Step S2, adding the prepared prepolymer and γ-(2,3-epoxypropoxy)propyltrimethoxysilane to dichloromethane, stirring at a uniform speed and heating to 50-65° C., keeping the temperature and reacting for 12-18 hours, and obtaining a modifier after the reaction is completed, and controlling the weight ratio of the prepolymer, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and dichloromethane to be 10-15:3-5:50; In step S2, the amino group on the prepolymer reacts with the epoxy group on γ-(2,3-epoxypropoxy)propyltrimethoxysilane to prepare a modifier, which is a polysiloxane with a siloxane structure and a quaternary ammonium salt structure; Step S3, adding titanium dioxide nanoparticles to deionized water, ultrasonically dispersing for 15 minutes, then adding a modifier, heating to 45-55°C, stirring at a uniform speed and reacting for 6 hours, filtering and washing after the reaction, placing in a vacuum drying oven at 110°C to dry, to obtain a functional filler, and controlling the weight ratio of titanium dioxide nanoparticles, modifier and deionized water to be 10-12:2-3:30-50.

[0006] In step S3, the siloxane structure on the modifier is hydrolyzed and polymerized with the hydroxyl group on the surface of titanium dioxide, and then the modifier is grafted on the surface of titanium dioxide. Titanium dioxide itself has excellent antibacterial properties and can cooperate with the quaternary ammonium salt in the modifier structure. Through organic / inorganic synergistic antibacterial, the coating is given excellent antibacterial properties. Moreover, the polysiloxane structure in the modifier structure can improve the slippery effect of rubber gloves, making it easier to put on and take off. The inorganic nano-titanium dioxide is modified by organic polymers, which can also improve the compatibility of titanium dioxide with organisms, so that the prepared functional filler can be evenly dispersed in the matrix. In addition, the residual hydroxyl group in the modifier in the present application can also be cross-linked with polyurethane to further improve the compatibility of the functional filler with the organism.

[0007] Furthermore, the thickener is an alkali swelling thickener or a polyurethane associative thickener.

[0008] Furthermore, the leveling agent is a nonionic surfactant or an anionic surfactant.

[0009] Furthermore, the defoamer is a polyether defoamer.

[0010] Further, the coating is prepared by the following steps: The raw materials of various components are mixed uniformly to prepare the anti-allergic and easy-to-release coating for latex gloves.

[0011] Beneficial effects of the present invention: The present invention prepares an anti-allergic and easy-to-detach coating, which is used for latex gloves and can prevent allergies caused by latex gloves. The anti-allergic and easy-to-detach coating uses polyurethane as a matrix, and adds functional fillers to give the coating excellent antibacterial and easy-to-detach properties. In the preparation process, the functional filler is firstly hydrolyzed into hydroxyl groups by dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and siloxane on N-(3-trimethoxysilylethyl)ethylenediamine, and then condensed to prepare a prepolymer, which is a polymer with an amino structure. Then, the amino group on the prepolymer reacts with the epoxy group on γ-(2,3-epoxypropoxy)propyltrimethoxysilane to prepare a modifier, and finally the siloxane on the modifier reacts with the epoxy group on the prepolymer to prepare a modifier. After the structure is hydrolyzed, it polymerizes with the hydroxyl groups on the surface of titanium dioxide, and then the modifier is grafted on the surface of titanium dioxide. Titanium dioxide itself has excellent antibacterial properties and can cooperate with the quaternary ammonium salt in the modifier structure to give the coating excellent antibacterial properties through organic / inorganic synergistic antibacterial. Moreover, the polysiloxane structure in the modifier structure can improve the slippery effect of rubber gloves, making them easier to put on and take off. The inorganic nano-titanium dioxide is modified by organic polymers, which can also improve the compatibility of titanium dioxide with organic bodies, so that the prepared functional filler can be evenly dispersed in the matrix. In addition, the residual hydroxyl groups in the modifier in the present application can also be cross-linked with polyurethane to further improve the compatibility of the functional filler with the organic body. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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. Example 1

[0013] An anti-allergic and easy-to-detach coating for latex gloves, comprising the following raw materials in parts by weight: 15 parts of polyurethane emulsion PUD-336, 0.1 parts of thickener ASE-60, 0.1 parts of leveling agent alkylphenol polyoxyethylene ether, 1 part of polyethylene wax, 0.1 parts of defoaming agent (GP-330), and 3 parts of functional fillers; The raw materials of various components are mixed uniformly to prepare the anti-allergic and easy-to-release coating for latex gloves.

[0014] The functional filler is prepared by the following steps: Step S1, adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine to a 15% volume fraction ethanol aqueous solution, heating to 50° C., adding dibutyltin dilaurate, stirring at a uniform speed and reacting for 36 hours, and obtaining a prepolymer after the reaction is completed, wherein the weight ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-(3-trimethoxysilylethyl)ethylenediamine and the ethanol aqueous solution is controlled to be 5:10:30, and the amount of dibutyltin dilaurate is 3% of the weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine; Step S2, adding the prepared prepolymer and γ-(2,3-epoxypropoxy)propyltrimethoxysilane to dichloromethane, stirring at a uniform speed and heating to 50° C., keeping the temperature and reacting for 12-18 hours, and obtaining a modifier after the reaction is completed, and controlling the weight ratio of the prepolymer, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and dichloromethane to be 10:3:50; Step S3, adding titanium dioxide nanoparticles to deionized water, ultrasonically dispersing for 15 minutes, then adding a modifier, heating to 45°C, stirring at a uniform speed and reacting for 6 hours, filtering and washing after the reaction, and drying in a vacuum drying oven at 110°C to obtain a functional filler, and controlling the weight ratio of titanium dioxide nanoparticles, modifier and deionized water to be 10:2:30. Example 2

[0015] An anti-allergic and easy-to-detach coating for latex gloves, comprising the following raw materials in parts by weight: 20 parts of polyurethane emulsion PUD-336, 0.3 parts of thickener ASE-60, 0.3 parts of leveling agent alkylphenol polyoxyethylene ether, 2 parts of polyethylene wax, 0.3 parts of defoaming agent (GP-330), and 4 parts of functional fillers; The raw materials of various components are mixed uniformly to prepare the anti-allergic and easy-to-release coating for latex gloves.

[0016] The functional filler is prepared by the following steps: Step S1, adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine to a 15% volume fraction ethanol aqueous solution, heating to 55° C., adding dibutyltin dilaurate, stirring at a uniform speed and reacting for 40 hours, and obtaining a prepolymer after the reaction is completed, wherein the weight ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-(3-trimethoxysilylethyl)ethylenediamine and the ethanol aqueous solution is controlled to be 6:12:35, and the amount of dibutyltin dilaurate is 4% of the weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine; Step S2, adding the prepared prepolymer and γ-(2,3-epoxypropoxy)propyltrimethoxysilane to dichloromethane, stirring at a uniform speed and heating to 55° C., keeping the temperature and reacting for 14 hours, and obtaining a modifier after the reaction is completed, and controlling the weight ratio of the prepolymer, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and dichloromethane to be 12:4:50; Step S3, adding titanium dioxide nanoparticles to deionized water, ultrasonically dispersing for 15 minutes, then adding a modifier, heating to 50°C, stirring at a uniform speed and reacting for 6 hours, filtering and washing after the reaction, placing in a vacuum drying oven at 110°C to dry, to obtain a functional filler, and controlling the weight ratio of titanium dioxide nanoparticles, modifier and deionized water to be 10:3:35. Example 3

[0017] An anti-allergic and easy-to-detach coating for latex gloves, comprising the following raw materials in parts by weight: 30 parts of polyurethane emulsion PUD-336, 0.8 parts of thickener (Vesmody U604), 0.8 parts of leveling agent sodium alkylbenzene sulfonate, 4 parts of polyethylene wax, 0.4 parts of defoamer (GP-330), and 5 parts of functional filler; The raw materials of various components are mixed uniformly to prepare the anti-allergic and easy-to-release coating for latex gloves.

[0018] The functional filler is prepared by the following steps: Step S1, adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine to a 15% volume fraction ethanol aqueous solution, heating to 65° C., adding dibutyltin dilaurate, stirring at a uniform speed and reacting for 50 hours, and obtaining a prepolymer after the reaction is completed, wherein the weight ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-(3-trimethoxysilylethyl)ethylenediamine and the ethanol aqueous solution is controlled to be 8:14:45, and the amount of dibutyltin dilaurate is 4% of the weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine; Step S2, adding the prepared prepolymer and γ-(2,3-epoxypropoxy)propyltrimethoxysilane to dichloromethane, stirring at a uniform speed and heating to 50-65° C., keeping the temperature and reacting for 14 hours, and obtaining a modifier after the reaction is completed, and controlling the weight ratio of the prepolymer, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and dichloromethane to be 15:5:50; Step S3, adding titanium dioxide nanoparticles to deionized water, ultrasonically dispersing for 15 minutes, then adding a modifier, heating to 55°C, stirring at a uniform speed and reacting for 6 hours, filtering and washing after the reaction, and drying in a vacuum drying oven at 110°C to obtain a functional filler, and controlling the weight ratio of titanium dioxide nanoparticles, modifier and deionized water to be 12:3:50. Example 4

[0019] An anti-allergic and easy-to-detach coating for latex gloves, comprising the following raw materials in parts by weight: 35 parts of polyurethane emulsion PUD-336, 1 part of thickener (Vesmody U604), 1 part of leveling agent sodium alkylbenzene sulfonate, 5 parts of polyethylene wax, 0.5 parts of defoamer (GP-330), and 6 parts of functional fillers; The raw materials of various components are mixed uniformly to prepare the anti-allergic and easy-to-release coating for latex gloves.

[0020] The functional filler is prepared by the following steps: Step S1, adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine to a 15% volume fraction ethanol aqueous solution, heating to 50-65° C., adding dibutyltin dilaurate, stirring at a uniform speed and reacting for 54 hours, and obtaining a prepolymer after the reaction is completed, wherein the weight ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-(3-trimethoxysilylethyl)ethylenediamine and the ethanol aqueous solution is controlled to be 10:15:50, and the amount of dibutyltin dilaurate is 5% of the weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine; Step S2, adding the prepared prepolymer and γ-(2,3-epoxypropoxy)propyltrimethoxysilane to dichloromethane, stirring at a uniform speed and heating to 65° C., keeping the temperature and reacting for 18 hours, and obtaining a modifier after the reaction is completed, and controlling the weight ratio of the prepolymer, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and dichloromethane to be 15:5:50; Step S3, adding titanium dioxide nanoparticles to deionized water, ultrasonically dispersing for 15 minutes, then adding a modifier, heating to 55°C, stirring at a uniform speed and reacting for 6 hours, filtering and washing after the reaction, and drying in a vacuum drying oven at 110°C to obtain a functional filler, and controlling the weight ratio of titanium dioxide nanoparticles, modifier and deionized water to be 12:3:50.

[0021] Comparative Example 1 Compared with Example 1, this comparative example uses nano titanium dioxide as the functional filler, and the rest is the same as Example 1.

[0022] Comparative Example 2 This comparative example is a coating for latex gloves produced by a certain company on the market.

[0023] The coatings prepared in Examples 1-4 and Comparative Examples 1-2 were applied to the inner surface of latex gloves, and then their performance was tested. The results are shown in Tables 1 and 2 below: Table 1

[0024] Table 2

[0025] It can be seen from Tables 1 and 2 above that the present invention imparts excellent antibacterial and easy-to-release properties to the coating by adding functional fillers.

[0026] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An anti-allergic and easy-to-detach coating for latex gloves, characterized in that: The raw materials include the following parts by weight: 15-35 parts of polyurethane emulsion (PUD-336), 0.1-1 parts of thickener, 0.1-1 parts of leveling agent, 1-5 parts of polyethylene wax, 0.1-0.5 parts of defoamer, and 3-6 parts of functional filler; The functional filler is prepared by the following steps: Step S1, adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine to a 15% by volume ethanol aqueous solution, heating to 50-65° C., adding a catalyst, stirring at a uniform speed and reacting for 36-54 hours, and obtaining a prepolymer after the reaction is completed; Step S2, adding the prepared prepolymer and γ-(2,3-epoxypropoxy)propyltrimethoxysilane into dichloromethane, stirring at a uniform speed and heating to 50-65° C., keeping the temperature and reacting for 12-18 hours, and obtaining a modifier after the reaction is completed; Step S3, adding titanium dioxide nanoparticles into deionized water, ultrasonically dispersing for 15 minutes, then adding a modifier, heating to 45-55°C, stirring at a constant speed and reacting for 6 hours, filtering and washing after the reaction, and drying in a vacuum drying oven at 110°C to obtain a functional filler.

2. The anti-allergic and easy-to-release coating for latex gloves according to claim 1, characterized in that: The thickener is an alkali swelling thickener or a polyurethane associative thickener.

3. The anti-allergic and easy-to-release coating for latex gloves according to claim 1, characterized in that: The leveling agent is a nonionic surfactant or an anionic surfactant.

4. The anti-allergic and easy-to-detach coating for latex gloves according to claim 1, characterized in that: The defoamer is a polyether defoamer.

5. The anti-allergic and easy-to-detach coating for latex gloves according to claim 1, characterized in that: In step S1, the weight ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, N-(3-trimethoxysilylethyl)ethylenediamine and ethanol aqueous solution is controlled to be 5-10:10-15:30-50, and the amount of catalyst used is 3-5% by weight of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and N-(3-trimethoxysilylethyl)ethylenediamine.

6. The anti-allergic and easy-to-release coating for latex gloves according to claim 1, characterized in that: In step S2, the weight ratio of the prepolymer, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and dichloromethane is controlled to be 10-15:3-5:

50.

7. The anti-allergic and easy-to-release coating for latex gloves according to claim 1, characterized in that: In step S3, the weight ratio of titanium dioxide nanoparticles, modifier and deionized water is controlled to be 10-12:2-3:30-50.

8. The anti-allergic and easy-to-release coating for latex gloves according to claim 1, characterized in that: The coating is prepared by the following steps: The raw materials of various components are mixed uniformly to prepare the anti-allergic and easy-to-release coating for latex gloves.

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