A batching method for uhmwpe fiber production that realizes continuous and uniform feeding

Abstract

The invention provides a new UHMWPE fiber production batching method capable of achieving continuous and uniform feeding. The method includes the following steps that 1, UHMWP solution with the concentration of 0.1-1% is prepared; 2, an ingredient is put into a strong shear dispersing device and shorn and dispersed to be uniform and stable; 3, UHMWPE powder, the UHMWP solution prepared in the step1 and the ingredient obtained in the step 2 are metered through a weightlessness scale and fed, wherein the weightlessness scale is provided with an automatic material supplementing device. By adopting the weightlessness scale for vector control, feeding is automatic, continuous and uniform, the batching error is smaller than 0.1%, the batching accuracy is improved to 0.097% from 1.2%, under thesame production conditions, the fineness CV value of UHMWPE fiber is reduced to 0.52% from 3.1%, the hyperploids stretch ratio of the fiber is increased by 3-10%, and strength, modulus, abrasion resistance, heat conductivity and creep resistance of the fiber are improved; the product strength is smaller than 42 g / d, and the modulus is smaller than 1650 g / d.

Description

technical field [0001] The invention belongs to the field of UHMWPE fiber production, and in particular relates to a method for producing ingredients for UHMWPE fiber that realizes continuous and uniform feeding. Background technique [0002] UHMWPE (Ultra High Molecular Weight Polyethylene) is a thermoplastic engineering plastic with a linear structure and excellent comprehensive properties, with a molecular weight of more than 1.5 million. UHMWPE fiber is a flexible chain polymer with high strength and high modulus, and its molecular microstructure is extremely regular. Because of its inert chemical structure, and highly oriented and highly crystalline structure, it has excellent performance in both chemical and physical properties, and has mechanical properties unmatched by other high-performance fibers. The third generation of high-performance fibers after aramid. Low density, good wear resistance, self-lubrication, impact resistance, corrosion resistance and so on. ...

AI Technical Summary

Problems solved by technology

This batching method not only has a large deviation between batches, but also has a density difference between white oil and UHMWPE powder. The concentration gradient in the vertical direction, and there is a dead angle in the reactor, and the stirring cannot be realized inside the feeding pipe, so the difference in ingredients is more significant

This difference is reflected in the production, the melt viscosity and the head pressure fluctuate periodically, and the deviation can reach 10%, which in turn affects the product fineness and the molecular conformation of UHMWPE, and finally leads to the performance of the product