Graphene, as a mono-atomic layer material, is the thinnest two-dimensional material found so far. Its theoretical thickness is only 0.35nm, and graphene has a large specific surface area of 2600m2/g and elastic modulus of 1000Gpa, which is often used in physics, materials, electronic information, computer and other fields.The elastic modulus is an index to measure the degree of difficulty in producing elastic deformation.The addition of graphene to rubber can increase the wear resistance, high strength, bacteriostasis and mechanical strength of rubber products.But there is not much technology available to use it in rubber gloves, and the technology is not mature.
The invention relates to a preparation method of graphene-nitrile foaming glove, in which graphene is directly mixed with the prepared nitrile foaming slurry to form a compound slurry containing graphene, and the knitting glove embryo is dipped into the compound slurry.Graphene is a nanomaterial with a very high viscosity. When it is mixed with micelle, the viscosity of composite micelle can reach 3000mpa.s or above even if the amount added is only 0.1 ~ 0.2%.Such a high viscosity of mucilage, not only all kinds of chelating agent and it is difficult to add (even added dispersion evenness is very poor), at the same time high viscosity can also lead to a series of quality problems, such as by mucilage infiltrating ability is poor, gloves embryo refractory with glue and glue, does gloves will appear after drying glue and glue, fingers into web or other product quality problems.However, both graphene and viscosity should be controlled, or the amount of graphene should be controlled to less than 0.1%, resulting in no significant improvement in the overall performance of gloves.Either by adding synergies (e.g., Span, Tween, etc.) to reduce the surface tension of latex, more graphene can be dissolved into the paste, and the addition of synergies can also easily lead to glue penetration, glue cracking and other problems.
The main reasons are :(1) the specific surface area of graphene is very large, and it is only soluble in non-polar solvents. Therefore, even if the amount added to latex is very low, it will bring high viscosity. Therefore, the amount can be added is very small, which makes the overall performance of gloves difficult to be improved.(2) when the rubber paste viscosity too high, the knitting gloves embryos (porous air, fiber, such as rough surface causes knitted gloves infiltration resistance) of embryo infiltrating ability is poor, difficult dipped with glue and glue, rubber gloves after embryo on the surface of the rubber mass of slag shaped, block, adhesive surface under the rubber from different parts of the beat, disconnect or unequal thickness, drying after plastic crack appear broken rubber, plastic and even glue penetration (local through hole), and even between the gloves of embryo of fingers, webbed gloves products serious is not qualified.In conclusion, the direct mixing of graphene and latex for the processing process of impregnated knitted glove embryo cannot produce qualified glove products.
Therefore, how to make better use of the properties of graphene to produce rubber gloves without affecting the normal production and production of rubber gloves is the technical problem that the invention hopes to solve.
Technical implementation elements:
The purpose of the invention is to provide a technical scheme which can make full use of the excellent physical and chemical properties of graphene and effectively guarantee the quality of rubber glove products
In order to solve the problem of the existing technology, the present invention provides a kind of graphene coated rubber gloves and its preparation methods, mixture preparation by latex with the graphene graphene coated, coated with rubber gloves to the outer surface, graphene coated with the latex adhesive, tight adhesion on the surface of glue, gloves to protect the inner surface, increase gloves overall strength, friction resistance, antibacterial, cutting resistance and tear resistance and so on comprehensive performance;The rubber glove body composed of inner rubber surface is used to protect the hands.
To achieve the above purposes, the main technical scheme of the invention includes:
A graphene-coated rubber glove comprises a glove embryo, a rubber layer attached to the outer surface of the glove embryo, and a graphene film layer covering the outer surface of the rubber layer;The rubber layer is a foamed rubber or a non-foamed rubber without graphene.
The invention relates to a preparation method of graphene coated rubber gloves, including:
A graphene-free gel slurry is prepared and the knitted glove embryo is soaked with the gel slurry;
Graphene-latex dispersion solution is prepared and the rubber hanging glove embryo containing the rubber slurry is reimpregnated with the graphene-latex dispersion solution.
The graphene-coated rubber gloves are prepared by vulcanization drying.
The beneficial effects of the invention are:
(1) graphene is prepared into graphene-latex dispersion solution, in which graphene, as a coated coating, covers the rubber surface of gloves to protect the inner rubber surface of gloves, improving the overall anti-friction, puncture resistance, cutting resistance and tear resistance of glove products, and at the same time making gloves have bacteriostatic properties.
(2) the invention changes the preparation process of gloves from the one-step dipping process of the prior art to the two-step dipping process, that is, one-step dipping of the graphene-free glue paste, so as to make the surface of the glove embryo hang glue;The graphene-latex dispersion is then impregnated for a second time, and a layer of graphene-latex dispersion is attached to the surface of the rubber surface after the first impregnation.The graphene-latex dispersion is then dried to form a graphene-containing film over a rubber surface formed by a single dip.
(3) with a dip of mucilage excluding graphene composition in the preparation, will therefore not be caused by graphene joining rubber paste viscosity is too large, the mucilage can obtain ideal infiltration capacity, rubber gloves after continuous smooth rubber evenly on the surface of the embryo, there will not be broken, cracked glue, glue penetration and the quality problem such as between the finger into a web, guarantee the quality of rubber gloves body section.
The second impregnated graphene-latex dispersion solution was prepared from a mixture of graphene, latex and water, where latex ACTS as an adhesive to bond graphene to the surface of the rubber formed by the first impregnation.Although graphene - latex dispersion also has a difficult problem to allocate viscosity is too high, but the secondary impregnated using graphene - latex dispersion does not constitute a glove, body structure, so the dispersion no need to add any other ingredients (vulcanizing agent, promoter, surfactant, frost prevention agent, dispersing agent, adhesive, etc.), as a result, the proportion of added graphene can be improved.At the same time, the excessive viscosity of graphene dispersion will not cause serious quality problems such as glue cracking, glue penetration and webbing between fingers, which will affect the basic functions of gloves.This is due to the fact that the glove embryo has a relatively smooth base surface (the knitted glove embryo is covered by the glue) after the first impregnation of the glue slurry, which reduces the infiltration resistance and facilitates the second impregnation of graphene-latex dispersion solution. Even if the graphene dispersion solution with high viscosity is impregnated, it can still hang and even glue well.During the second dip, the whole/part of the rubber hanging glove embryo after the first dip (e.g., only the palm part and finger part) is quickly immersed in the graphene-latex dispersion solution, which is taken out and dried.After drying, the positions impregnated with graphene-latex dispersion solution are covered with a layer of graphene film, which can form a good protection for the inner glove adhesive surface, improve the overall anti-friction, puncture resistance, cutting resistance and tear resistance of glove products, and make the gloves have bacteriostatic properties.
(4) the rubber body structure part of the glove is formed after the second dip, and the rubber body structure is solidified after the first dip, so as to ensure the quality of the body structure conforms to relevant standards (EN388) and ensure the basic labor protection function of the glove;The graphene coating formed by the second dip can protect the rubber surface formed by the first dip and improve the overall performance of glove products.
In conclusion, the invention USES graphene to form a protective layer on the surface of rubber gloves, achieving a good expected effect. In particular, the abrasion resistance is significantly improved, while the tensile strength and tear resistance of gloves are significantly improved.Made according to the invention method, 13 needle knitting glove machine (model) of the needle used polyester foam nitrile gloves according to the grades of EN388 test for 3142 (Numbers correspond: wear-resisting, cutting, tearing, Pierce), 13 needle and ordinary polyester nitrile gloves according to the grades of EN388 test is only 2131, therefore, the invention method preparation of gloves overall performance improved significantly, the wear resistance can be more than 6 days.