The invention relates to the technical field of
machining, in particular to a preparation method of a protective agent for heat treatment of a gauge for
welding part
machining. The preparation method comprises the steps that firstly, 15 parts of
sodium laureth
sulfate and 20 parts of water are added into a container, and stirring is conducted for five minutes; secondly, 0.5 part of
banana oil is added slowly, stirring is conducted while the
banana oil is added, and stirring is conducted for five minutes after adding is completed; thirdly, 12 parts of
polyvinyl acetate emulsion and 10 parts of water are added slowly, stirring is conducted while the
polyvinyl acetate emulsion and the water are added, and stirring is conducted for five minutes after adding is completed; fourthly, 0.5 part of
alkyl ethoxy polyglycosides is added slowly, stirring is conducted while the
alkyl ethoxy polyglycosides is added, and stirring is conducted for five minutes after adding is completed; and finally, 15 parts of
calcium chloride and 17.7 parts of water are added slowly, and stirring is conducted for 15 minutes. By the adoption of the step-by-step adding method, the
solubility of all the substances can be improved, the probability of
particle aggregation can be avoided, and the surface protection function of the protective agent is remarkably improved.