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This invention discloses a method for preparing pentaerythritol oleate based on sodium bisulfite. The method involves the esterification reaction of pentaerythritol and oleic acid with sodium bisulfite as an auxiliary agent. Sodium bisulfite, as an auxiliary agent, possesses both catalytic and antioxidant functions, effectively improving the reaction rate and product yield while suppressing oxidation side reactions. This eliminates the need for additional antioxidants, improving product quality and reducing costs. The preparation method is simple, mild, and environmentally friendly, with readily available raw materials, low-cost auxiliary agents, and easy separation. After the reaction, the catalyst is removed by hot filtration, and unreacted oleic acid is removed by solvent extraction, effectively reducing the product's acid value. The extracted potassium oleate byproduct has a purity of 80%–90% and can be used as a flotation agent, release agent, or raw material for lubricant production, making it suitable for industrial applications. The resulting pentaerythritol oil is suitable for high-end lubricants, bio-based plasticizers, and environmentally friendly coatings.

The present application relates to the field of graphene reinforced titanium alloy composite material, in particular to a preparation method of in-situ deposition three-dimensional network graphene reinforced titanium alloy composite material, which comprises the following steps: firstly, three-dimensional network graphene is in-situ deposited on the surface of porous titanium through chemical vapor deposition process; then, titanium alloy melt is filled into the porous preform by using high vacuum melt infiltration process, after a period of heat preservation treatment, finally, three-dimensional network graphene reinforced titanium alloy composite material is obtained by quenching. The three-dimensional network graphene reinforced titanium alloy composite material prepared by the present application has good interface combination and dense structure, by introducing graphene in the composite material, not only the load transmission effect is achieved, but also the part of TiC particles formed at the interface can make the crack deflect and hinder the crack propagation.

The application provides a plastic hot cutting punching process and relates to the technical field of plastic part forming, and comprises the following process steps: S1: a mold for forming a given injection molded part is designed, and the mold is subjected to mold closing treatment, and the mold is a solid non-hole forming structure; S2: injection melt is injected into the mold, the injection melt is driven to flow in the mold in a unidirectional and continuous manner, and no bifurcation phenomenon occurs in the flowing process; S3: when the injection melt completely fills the internal cavity of the mold, the mold is subjected to pressure maintaining and cooling operation, and the injection molded part is cooled and solidified; and S4: a hot cutting knife on a hot cutting mechanism is used to perform hot cutting operation on a preset opening position on the injection molded part, and a hot cutting through hole is formed. The application avoids the generation of a melt joint at an opening position of the injection molded part by using a mold without an opening to form the injection molded part, and then performing hot cutting on the injection molded part after the injection molded part is formed, thereby improving the impact toughness of the injection molded part at the opening position and the overall aesthetic appearance.