Sulfur-containing modified guar gum as well as preparation method and application thereof

The invention provides sulfur-containing modified guar gum as well as a preparation method and application thereof, and belongs to the technical field of oilfield development. The structure of the guar gum is shown as a formula I, sulfide has reducibility, can adsorb oxygen free radicals and prevent materials from being degraded and is a high-efficiency, low-toxicity and broad-spectrum bactericide, and S has better coordination performance than O and has better performance in crosslinking and adsorption. The guar gum is subjected to sulfur-containing modification by means of the advantages of reducibility and bactericidal performance of the sulfide, so that the guar gum is more environmentally friendly, and the service life of the guar gum is prolonged. Therefore, the antibacterial property of the guar gum is improved, and the problem that the guar gum must be prepared on site due to deterioration and degradation of the guar gum liquid in oilfield fracturing site construction is solved. 本发明提供了一种含硫改性瓜尔胶及其制备方法和