The invention relates to an
animal feed additive, i.e. a composite
grease emulsifying agent for a coated feed, and a preparation method thereof. The composite
grease emulsifying agent for the coated feed comprises the following components in
raw material ratio in percentage by weight: 10 percent to 30 percent of
glyceryl monostearate, 10 percent to 30 percent of
sucrose monolaurate, 5 percent to 20 percent of
sorbitol anhydride monolaurate, 5 percent to 10 percent of
glycerol monolaurate, 20 percent to 50 percent of
polyethylene glycol and 20 percent to 50 percent of
silicon dioxide. The preparation process of the
grease emulsifying agent comprises the following steps of: firstly, carrying out heat preservation after heating and melting high HLB (
Hydrophile-Lipophile Balance) value raw materials; adding
silicon dioxide to adsorb to form fine particles; and then dissolving low HLB value raw materials and
polyethylene glycol by an
organic solvent, uniformly spraying the solution on the fine particles to obtain a finished product. Four food emulsifying agents with different HLB values, which are selected by the invention, are processed by scientific compatibility, are suitable for emulsifying various greases in the feed, have stable emulsifying effects and can keep the state of not breaking
emulsion for a long time; after being subjected to
coating processing, all of four emulsifying agent ingredients can tolerate high
temperature treatment and are suitable for
pelletizing processing of the feed.