Abstract: An error-proof double-locking quick connector is provided, which includes a male plug provided with a boss and a housing, a cavity structure is provided in the housing, and the cavity structure is provided with a first insertion hole, a second insertion hole, a first limiting hole and a second limiting hole, and a positioning block is also arranged in the cavity structure. A locking device is inserted into the first insertion hole, a positioning card is inserted into the second insertion hole. In the present disclosure, a locker and a positioning card are connected and fixed on the housing, which has a double protection effect on the fixing of the male plug, and is also convenient for observing an installation state, avoiding the occurrence of installation falling off, the structure is simple, and it is easy to disassemble.

Abstract: A composite polyester hot-melt adhesive, a preparation method thereof and a preparation method of an anti-scouring geotextile are provided. The preparation method of the composite polyester hot-melt adhesive includes the following steps: performing an esterification reaction on a dibasic acid and a dihydric alcohol under a protection of nitrogen and an action of a titanium/cobalt composite catalyst, adding a stabilizer for a polycondensation reaction to obtain a polyester hot-melt adhesive, then adding polymethyl methacrylate (PMMA) microspheres for mixing and stirring to obtain the composite polyester hot-melt adhesive. The anti-scouring geotextile is obtained by bonding a polyethylene terephthalate woven fabric with a polypropylene geotextile by the composite polyester hot-melt adhesive.

Abstract: The present application discloses an error-proof double-locking quick connector, comprising a male plug provided with a boss and a housing (1), a cavity structure is provided in the housing (1), and the cavity structure is provided with a first insertion hole (11), a second insertion hole (12), a first limiting hole (13) and a second limiting hole (14), and a positioning block (15) is also arranged in the cavity structure. A locking device is inserted into the first insertion hole (11), a positioning card is inserted into the second insertion hole (12). In the present application, a locker and a positioning card are connected and fixed on the housing, which has a double protection effect on the fixing of the male plug, and is also convenient for observing the installation state, avoiding the occurrence of installation falling off, the structure is simple, and it is easy to disassemble.

Abstract: A composite polyester hot-melt adhesive, a preparation method thereof and a preparation method of an anti-scouring geotextile are provided. The preparation method of the composite polyester hot-melt adhesive includes the following steps: performing an esterification reaction on a dibasic acid and a dihydric alcohol under a protection of nitrogen and an action of a titanium/cobalt composite catalyst, adding a stabilizer for a polycondensation reaction to obtain a polyester hot-melt adhesive, then adding polymethyl methacrylate (PMMA) microspheres for mixing and stirring to obtain the composite polyester hot-melt adhesive. The anti-scouring geotextile is obtained by bonding a polyethylene terephthalate woven fabric with a polypropylene geotextile by the composite polyester hot-melt adhesive.