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Screw element with an axially asymmetric screw profile, the profile having at least two construction points located within the screw profile
The present invention relates to a screw element having an axially asymmetric screw cross-sectional profile with at least two configuration points located within the screw cross-sectional profile. The screw element according to the present invention is suitable for use in an extruder with two drive shafts rotating in the same direction and at the same
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A galantamine bis(hydroxynaphthyl) sustained-release microparticle for injection and its preparation method
The present invention discloses sustained-release microspheres of galantamine embonate for injection and a preparation method thereof. The microspheres comprise galantamine embonate, a lactide-glycolide copolymer, and a weakly alkaline additive, and are prepared by a hot-melt extrusion combined with low-temperature pulverization technology. Compared with the prior art, the microspheres prepared by the present invention have low
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A method for preparing granular polyglycolic acid
The present invention discloses a preparation method of granular polyglycolic acid. The method comprises the steps of: pre-polymerizing molten glycolide with a reaction auxiliary in a static mixer to obtain a glycolic acid prepolymer; final-polymerizing the glycolic acid prepolymer obtained in the previous step with a chain extender through a viscosity-increasing device to obtain a
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Multi-segment venting extruder and its usage
The present invention discloses a multi-stage vented extruder and a usage method thereof. The extruder comprises a motor, a speed reducer, a barrel assembly, a screw assembly and an extrusion head. The barrel assembly comprises a first barrel, a second barrel and an auxiliary barrel connected between the first barrel and the second barrel, and
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Twin-screw assembly and processing technology for melt modification of polyvinyl alcohol materials
The invention relates to the technical field of polymer material processing, in particular to a twin-screw configuration and processing technology for melt modification processing of polyvinyl alcohol (PVA) materials. According to the rheological characteristics of PVA materials, the invention defines the length proportion of each functional section in the screw and the model of screw
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High-shrinkage novel polyester fiber and its preparation method
The invention discloses a novel high-shrinkage polyester fiber and a preparation method thereof. The novel high-shrinkage polyester fiber is obtained by esterification, polymerization and spinning of 2-methyl-1,3-propanediol monomers and dicarboxylic acid monomers. The glass transition temperature of the fiber is 40–60℃, and it has a shrinkage rate of more than 60% in hot water above
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