High-stability silicon rubber latex or emulsion and preparation method thereof

Abstract

The invention discloses high-stability silicon rubber latex or emulsion. The latex or emulsion comprises 40-75wt% of high-viscosity silicon rubber, 10-25wt% of emulsifier and 15-50wt% of water. The solid content of the high-stability silicon rubber latex or emulsion can be adjusted in the range of 50-85% at will, the high-stability silicon rubber latex or emulsion is further diluted with water in application until the solid content is 0.1-50%, the diluent is also stable, and no oil floating or layering can be caused after 180 days. The prepared latex or emulsion can be used for surface treatment and has lasting obviously-enhanced smooth and thick feeling style, and the style can be maintained for more than half a year and is not changed.

Description

technical field [0001] The invention relates to the field of new organic silicon chemical materials, in particular to a dilution-stable high-solid-content high-viscosity silicone rubber latex or emulsion and a preparation method thereof. Background technique [0002] High viscosity polydimethylsiloxane, especially viscosity (25°C) greater than 10 6 In practical application, polydimethylsiloxane of mpa.s is often called high-viscosity silicone rubber because of its almost non-flowing appearance. It has significantly enhanced slippery feeling than conventional medium-low viscosity polydimethylsiloxane. It has an irreplaceable role and value as a special hand feeling agent in the textile, paint, and daily chemical industries. It must be in the form of itself and a diluted and stable emulsion to fully meet the practicability. However, the diluted and stable high-viscosity polydimethylformaldehyde The preparation of silicone-based emulsion is still a technical problem both at ho...

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Problems solved by technology

Among them, the mechanical emulsification method mostly uses thickeners and emulsifiers to achieve short-term stabilization. Once such an emulsion is diluted, the emulsion will quickly become unstable due to the loss of the stabilizing effect of the thickener, and oil floating or separation will occur. layer phenomenon, resulting in silicon spots or even unapplicable when applied. Most of such emulsions are only suitable for thick shampoos or creams and other systems that require thickness; emulsion polymerization can achieve no need for thickening A thin and stable emulsion can be prepared with a single solvent, and its dilution stability is also ideal. The most classic example is to use dodecylbenzenesulfonic acid as a catalyst and emulsifier to initiate the organosilicon ring (D4 or DMC) in water Carry out emulsion polymerization, then carry out telomerization, after the molecular weight increases to a certain value, add a certain amount of alkali for neutralization to obtain a milky white stable hydroxyl-terminated polydimethylsiloxane (107 silicone rubber) anionic emulsion, but this method The obtained product still has defects. One is that the product obtained by this method has a maximum internal phase viscosity of no more than 3×10 by demulsification method. 5 mpa.s, mostly 20000~100000mpa.s, although such products have a strong slippery feeling when used for surface treatment, but the slippery feeling is not long-lasting, and often loses the slippery feel or the slippery feel is significantly reduced in about 30 days. thick, and this method can only produce emulsions with a solid content of no more than 35%, and high-solid emulsions such as silicone rubber emulsions with a solid content of 50-85% cannot be produced by this method

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