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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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A powder Metallurgical material processing equipment and processing technology
The present invention discloses a powder metallurgy material processing device. By using a reciprocating pin screw extruder instead of traditional equipment such as internal mixers and open mills, the powder metallurgy material processing device can reduce floor space, improve processing efficiency, and lower pollution and cost. By feeding powder metallurgy raw materials, iron powder and…
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Extruder for thickening preparation of meltable polymers
The present invention relates to an extruder (100) comprising a housing with an inner housing recess, in which an extruder screw with helical extruder screw flights (32, 33, 34) is rotatably mounted. The outer diameter of the extruder screw is subdivided into a diameter start zone, a diameter center zone and a diameter end zone,…
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Polyamide industrial filaments and their preparation methods and applications
A polyamide industrial yarn and a preparation method and application thereof, wherein the production raw materials of the polyamide industrial yarn at least comprise 1,5-pentanediamine and linear aliphatic diacid; or polyamide 5X polymerized from 1,5-pentanediamine and linear aliphatic diacid as monomers. The polyamide industrial yarn has the characteristics of low water absorption, good dimensional stability,…
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Lightweight, high-rigidity multi-segment cylindrical vacuum bottles and their preparation methods
The present invention relates to a lightweight, high-rigidity multi-section cylindrical vacuum bottle and a preparation method thereof, designed to address the technical problems of existing similar products such as difficulty in reusing the outer casing, poor environmental performance, high packaging cost, and room for improvement in material production processes. The key point is that the…
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