Ultra-high molecular weight polysiloxane emulsion, preparation method and special equipment thereof

Abstract

Belonging to the technical field of chemical finishing materials, the invention relates to an ultra-high molecular weight polysiloxane emulsion, a preparation method and special equipment thereof. The ultra-high molecular weight polysiloxane emulsion comprises the following components by mass: 100 parts of polysiloxane with viscosity of 150000-200000cs, 20-50 parts of a composite emulsifier, and 150-300 parts of deionized water. The composite emulsifier is composed of, by weight: 15-25 parts of fatty alcohol polyethylene oxide, 2-8 parts of fatty alcohol polyoxyethylene ether, 3-7 parts of sodium dodecyl sulfate, and 2-6 parts of polyol. The composite emulsifier provided by the invention has the characteristics of reasonable compatibility of components and a HLB value in a reasonable range, and can achieve a good emulsification effect and high emulsification efficiency when used for ultra-high molecular weight polysiloxane emulsification. The ultra-high molecular weight polysiloxane emulsion prepared by the invention has high molecular weight and high viscosity. Application of the ultra-high molecular weight polysiloxane emulsion in leather surface finishing can endow the leather surface with lubricant and smooth handfeel, and can remain for a long time on the leather surface.

Description

technical field [0001] The invention relates to an ultra-high molecular weight polysiloxane emulsion, a preparation method and special equipment thereof, and belongs to the technical field of chemical coating materials. Background technique [0002] With the rise and development of the organosilicon chemical industry, the organosilicon industry has developed rapidly. Because of its unique properties, silicone has been widely used in various sectors of the national economy. At present, there are hundreds of varieties of silicone products in the market, and it has also achieved good results in leather and fur applications. It can give leather With new features: the leather body is soft, elastic, refreshing and comfortable to the touch, and a discontinuous microporous film can be formed on the surface of the leather, which does not affect the breathability and hygienic performance of the leather. It is an ideal leather chemical material. Organosilicon hand feel agent is used f...

AI Technical Summary

Problems solved by technology

The preparation of emulsion type silicone hand feeling agent can be divided into external emulsification method and internal emulsification method. The internal emulsification preparation method is: use octamethylcyclotetrasiloxane (D 4 ) as the starting material, emulsified with a suitable emulsifier, and then ring-opened polymerization with a catalyst. However, the silicone emulsion prepared by this method has a low monomer conversion rate and a small molecular weight. When used as a leather hand agent, its slippery feeling Too much but not enough greasy feel, and its hand feeling is kept for a short time, etc.

Take octamethylcyclotetrasiloxane (D 4 ) as the starting raw material, adding a catalyst for ring-opening polymerization, and adding a silicone coupling agent for bulk polymerization, a high-component, high-viscosity silicone polymer can be prepared, which can be formulated into an emulsion for leather surface coating, which can impart The surface of the leather has oily and smooth feel, and it stays on the leather surface for a long time, which improves the durability of the feel. However, the silicone prepared by this method is insoluble in water, and because the viscosity is above 150000cs, use a stirrer, Commonly used dispersing equipment such as high-speed shear disperser and sand mill cannot make it disperse into a uniform emulsion

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