The invention discloses a preparation method and an application of hydrophobic modified
guar gum. The method comprises the following steps of: suspending
guar gum in an
ionic liquid, adding a basic catalyst, and alkalifying at the temperature of 10-40 DEG C; gradually heating under the protection of
nitrogen, dropwise adding a modifying agent slowly, and heating to 30-80 DEG C for performing a modification reaction; and after the reaction, adding
organic acid for adjusting the pH to 5-7, soaking and washing with
ethanol, filtering, and
drying a
filter cake in vacuum to obtain the hydrophobic modified
guar gum. A hydrophobic
alkyl long chain is introduced into
guar gum hydroxyl, and a terminal group is a
carboxylic acid group, so that the water dissolving speed of the
guar gum is increased, the macromolecular quality characteristic of the
guar gum is protected to the maximum extent, and the guar gum is endowed with hydrophobic performance. Compared with other modified guar gum, the hydrophobic guar gum has the advantages of high molecular weight, high compatibility with
cellulose, increase in the molecular bonding force of
cellulose-guar gum, improvement on the paper strength and applicability to a paper-making wet part
chemical process as a reinforcing agent and a surface
sizing agent.