Alkyl tetramine synthesis method, alkyl tetramine product and shale inhibitor thereof

The invention relates to an alkyl tetramine synthesis method, an alkyl tetramine product and a shale inhibitor thereof. The synthesis method comprises the following steps of S1, amino acid synthesis; S2, esterification reaction; S3, ammonia transesterification; S4, Hofmann degradation reaction; S5, BOC removal protection. The alkyl tetramine product prepared by the method has the molecular structural formula shown as the accompanying drawing; the alkyl tetramine product and clear water are prepared into the shale inhibitor according to the proportion of 1 to 3 percent. The synthesis method provided by the invention is reliable; the synthesis yield is high; the raw material price is low; the production cost is low; the product is safe, achieves the environment-friendly effects, and is suitable for large-scale industrial production. The alkyl tetramine product is nontoxic and harmless and has good water solubility; the inhibition performance is obviously improved through being compared with that of similar products; meanwhile, the temperature-resistant capability reaches 240 DEG C; the product is particularly suitable for ultra-high-temperature deep well drilling.