Silicon modified lignin intumescent flame-retardant charring agent and preparation method and application thereof

Abstract

The invention relates to a silicon modified lignin intumescent flame-retardant charring agent and a preparation method thereof. The method comprises the following steps of: dispersing lignin in an aqueous solution of ethanol by using a surfactant, adding an organic silica compound in an amount which is 5 to 35 percent of the weight of the lignin into the solution, reacting for 3 to 6 hours, filtering, washing and drying, and thus obtaining a powdery granule product of which the lignin surface is wrapped with an organic silica polymer. Because the lignin serving as a renewable resource is used as a main component, the charring agent is more environment-friendly, and the cost of a flame retardant can be reduced; the preparation method is simple and easy to implement; and the charring agent can be compounded with multiple acid sources and applied to an intumescent flame-retardant system, so that the stability and the flame-retardant efficiency of the flame retardant in a matrix can be improved, and the flame retardant is particularly suitable to be applied to flame retarding of polylactic acid.

Description

technical field [0001] The invention relates to a silicon-modified lignin expansion flame-retardant charcoal agent and a preparation method thereof, and the application of the charcoal agent as a carbon source in an intumescent flame retardant in a polylactic acid matrix. Background technique [0002] With the advancement of science and technology and the improvement of people's living standards, the application of polymer materials has become more and more extensive, which has also led to the rapid development of flame retardant materials. Flame retardants have become the second largest additives in plastic additives. However, the application of existing halogen-containing flame retardants is being increasingly restricted due to the generation of a large amount of toxic smoke during combustion, while inorganic flame retardants such as metal hydroxides have low flame retardant efficiency and have a negative impact on the mechanical properties of materials. And so on, it also...

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Problems solved by technology

[0004]In addition, simply use intumescent flame retardant systems such as ammonium polyphosphate-pentaerythritol, ammonium polyphosphate-phenyl phosphate, pentaerythritol phosphate and ammonium polyphosphate-lignin, etc., There are still shortcomings such as insufficient flame retardant efficiency, poor compatibility with polymers, easy migration, and easy moisture absorption.

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