Preparation method and application method of graphene-based leather finishing agent with high physical properties

Abstract

The invention relates to the technical field of leather making chemistry and engineering, and provides a preparation method and an application method of a graphene-based leather finishing agent with high physical properties. Graphene oxide is used as a modifying material, and the oxygen-containing groups in the graphene oxide make the graphene oxide have a good water solubility and a good reactionactivity, so the graphene oxide can react with hydroxyl groups, carboxyl groups or amino groups in polyacrylate, polyurethane resin or polysiloxane, or can be combined with the hydroxyl groups, carboxyl groups or amino groups of leather collagen fibers to achieve a low shedding possibility. The polyacrylate, polyurethane resin and polysiloxane are used as carriers to prepare the graphene-based leather finishing agent with a stable homogeneous system, so the dispersion stability of graphene oxide in the polyacrylate, polyurethane resin and polysiloxane is effectively improved, and the advantages of the polyacrylate, polyurethane resin, polysiloxane and graphene are complementary; and the obtained leather finishing agent is applied to the surface of leather to form a uniform graphene-containing film on the surface of the leather, so the performances of the leather coating layer are improved.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to a preparation method and application method of a graphene-based leather finishing agent with high physical properties. Background technique [0002] Leather finishing is a very important process in the leather manufacturing process. Unpainted leather has a rough feel and is easy to be damaged. After finishing, a thin film is formed on the leather surface, which feels smooth and has a certain strength and is not easy to damage. Due to the limitation of leather chemicals, currently widely used leather products have technical defects such as poor coating strength, wear resistance, and aging resistance. This situation seriously restricts the competitiveness of my country's leather products in the international market. The research and development of high-performance key technologies of products and the use of high-tech to transform the traditional leather ind...

AI Technical Summary

Problems solved by technology

[0004] 1. In the existing method, graphene uses ethylene glycol ether as a dispersion medium, and ethylene glycol ether is an organic solvent, which will produce VOC, which is harmful to human health and does not meet the needs of environmental protection leather; moreover, graphene has a reaction inertia Due to technical defects, it is difficult to react with leather finishing agent components or leather collagen fibers. With the gradual volatilization of ethylene glycol ether, graphene will aggregate and deposit on the leather surface, with uneven distribution and easy peeling, showing that the leather surface is different. The defect of different wear resistance of the coating on the part reduces the film-forming stability of the coating agent and reduces the practical effect of the coating; the prepared coating agent is a heterogeneous system with poor stability and cannot be stored;

[0005] 2. The leather finishing agent is a multi-component mixture, including polyacrylate, polyurethane resin and other non-resin components. In the existing method, the graphene dispersion is directly added and mixed with the leather finishing agent, which will cause graphene to be mixed with the leather finishing agent. The phenomenon of adsorption of polyacrylate and polyurethane resin, and adsorption with non-resin components, while the wear resistance of the coating mainly depends on the properties of polyacrylate and polyurethane resin in leather finishing agents, and the adsorption on graphite of non-resin components Graphene fails to play an effective role, resulting in low effective utilization of graphene, increasing costs and other production problems

[0006] 3. Graphene has technical defects such as easy agglomeration and inert reaction. Therefore, it is difficult to disperse graphene directly into the polymer system, and it is difficult to functionalize it using graphene. The force between graphene and polymer only exists The van derwalls force does not significantly improve the physical and chemical properties of the material; compared with graphene, graphene oxide can be better dispersed in the polymer system, but because its two-dimensional structure has been destroyed, its physical and chemical properties are relatively Graphene mixing has a significant drop

Since the intermolecular force is far weaker than the covalent bond, the flexibility of the polymer chain segment is too strong, and it is difficult to anchor graphene or graphene oxide on the polymer by relying on the van der walls force, resulting in graphene or graphene The dispersibility of graphene oxide in polymer is too weak, the improvement of physical and chemical properties is relatively limited, and it is easy to form precipitation or suspension, which greatly reduces the comprehensive performance of composite materials and has low practicability