Extrusion method of alkyd polyester and compound thereof

Abstract

The invention discloses an extrusion method of alkyd polyester and a compound thereof. The extrusion method comprises the following steps: (1) drying raw materials; (2) extruding; (3) shaping; and (4) performing traction. The method has the advantages that by reasonably setting the temperature of each area of a single-screw extruder, the alkyd polyester can be fully melted, and meanwhile, degradation caused by too high temperature is prevented; a first-area sizing die and a second-area sizing die are arranged, anti-sticking layers are arranged on the inner surfaces of the first-area sizing die and the second-area sizing die, the surface energy of the inner surfaces of the sizing dies can be reduced, the interaction between the inner surfaces of the dies and polymer melt is reduced, the temperature can be uniformly reduced by adopting two-stage cooling with the first area and the second area, and bar cracking or high-temperature degradation is further prevented. In addition, a plug is additionally arranged at the head of the first-area sizing die, pressure can be applied to plastic melt in the die, the bar density is increased, and holes are further reduced.

Description

Technical field: [0001] The invention relates to the production technical field of alkyd polyester and its compound, in particular to an extrusion method of alkyd polyester and its compound. Background technique: [0002] Alkyd polyester is a kind of polymer polymerized by molecules containing both hydroxyl and carboxyl groups in monomers, mainly including polylactic acid, polyglycolic acid and their copolymers or blends, which can be widely used as degradable materials in packaging , disposable products, oil and gas development and other fields, its molecular structure can be expressed as Wherein R is alkyl or aryl. [0003] In order to make the above-mentioned polymers into end products with practical functions, it usually needs to undergo processing steps such as injection molding and extrusion to make them have a certain size and shape, which meets the requirements of the final practical scene. Among them, extrusion processing is an important processing method to obta...

AI Technical Summary

Problems solved by technology

These ester bond units will form coordination or hydrogen bonding with metal cations or -OH groups on the surface of ordinary molds, resulting in a strong affinity between the alkyd polyester chains on the surface of the polymer melt and the mold surface ; and due to the entanglement between the polymer chains in the melt, when the alkyd polyester and its composites are extruded, the polymer is seriously adhered to the surface of the mold when it is cooled, and patterns, roughness, etc. appear on the surface of the extruded product Happening

Images