Preparation method and application of durable super-hydrophobic finishing agent

Abstract

The invention relates to a durable super-hydrophobic finishing agent. The finishing agent comprises components as follows: long-chain alkyl alkoxy polysiloxane, a self-prepared active cationic emulsifier and organic tin. The long-chain alkyl alkoxy polysiloxane is taken as a main active component, an organic tin catalyst and the self-prepared active cationic emulsifier are taken as auxiliary components, and three active groups exist in the structure of the long-chain alkyl alkoxy polysiloxane, are hydrolyzed through heating under the action of water and are interlinked to form a net structure, so that the hydrophilicity is greatly reducer, and meanwhile, the washability is improved; the organic tin can promote combination of organosilicon with fibers, so that the hydrophobicity and the washability are further improved; the self-prepared active cationic emulsifier can be decomposed under a heating condition to produce another hydrophobic substance, and the substance and the long-chain alkyl alkoxy polysiloxane have a synergistic waterproof effect, so that the super-hydrophobic effect is realized. The preparation method and the application have the characteristics that the technology is simple, the application cost is low and the like.

Description

technical field [0001] The invention belongs to the field of fabric waterproof finishing agents, and relates to a preparation method and application of a durable superhydrophobic finishing agent. Background technique [0002] Superhydrophobic fabrics have special wettability, that is, the contact angle of water droplets on the surface of the fabric is greater than 150°, and it is easy to roll on its surface. This special property of super-hydrophobic fabric makes it have a "lotus leaf effect", which is manifested in the fact that water droplets will take away the dirt on the surface during the rolling process, thereby achieving self-cleaning effect and avoiding water damage to the fiber. The impregnation of the matrix degrades the aging thus prolonging the life of the fabric. Superhydrophobic fabrics are widely used in industrial production, military products and daily life. [0003] The idea of ​​preparing super-hydrophobic surfaces in many patents is: first build a micro...

AI Technical Summary

Problems solved by technology

Most of these materials are inorganic nanoparticles, which have poor affinity with fibers, so the durability of the prepared superhydrophobic fabric is not good.

In addition, when performing low surface energy treatment on substrates, most methods require the use of solvents to dissolve low surface energy substances. On the one hand, this causes solvent pollution. On the other hand, low surface energy substances only bond on the fiber surface, so they are not resistant to friction. , the superhydrophobic performance is not durable

However, Chinese patents such as CN 102965910 B and CN 103074768 A roughen the surface of the polyester fabric by treating the polyester fabric with strong alkali, which will cause great damage to the fiber and shorten its service life, and the method is not widely applicable.

However, Chinese patents such as CN 101775744 B and CN 103981718 A use fluorine-containing hydrophobic finishing agents, which are expensive and are still inferior to fluorine-free silicone products in terms of environmental protection requirements; among them, CN 101775744 B needs to first place the hydrophobic finishing agent in an oven for treatment 1 hour or more, then in supercritical CO 2 Finishing in the dyeing tank, the process is complicated, the equipment requirements are high, the finishing time is too long, and it is difficult to realize industrialization. The Chinese patent introduces a new short fluorine chain finishing agent.