KR20050062757A - Spinneret for forming chemical threads and fibers from solutions - Google Patents

Abstract

The invention relates to spinnerets for forming chemical threads from solutions, in particular to spinnerets made of zirconium based material. The aim of the invention is to develop a spinneret which excludes the adhesion of material thereof to a cutting tool during the embodiment of a small calibrated hole having a perfect shape, thereby increasing the operating life of said spinneret, the stability of a moulding process and the quality of the such produced threads and fibres without degrading the corrosion stability of the spinneret. To that effect, said spinneret is made of a zirconium alloy containing: 0.05-1.1 mass % of niobium; 0.001-0. 2 mass % of oxygen; 0.001-0.006 mass % of nitrogen; 0.001-0.02 mass % of silicium; 0.001-0.05 mass % of iron; 0.001-0.005 mass % of molybdenum; 0. 005-0.26 mass % of impurities; the rest being zirconium. Said invention makes it possible to increase the operating time of the spinneret by 8-27 %, the stability of moulding process and improve the quality of threads and fibres.

Description

Zirconium alloys for spinning machines for chemical yarns and chemical fibers {Spinneret for forming chemical threads and fibers from solutions}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning machine for forming chemical yarns and chemical fibers from a solution, and more particularly, to a spinning machine made of a zirconium-based material.

Conventional spinning machines for producing chemical yarns and chemical fibers were made of platinum-palladium alloy (75-25). (TU 3-1744-88: Spinnerets for forming chemical threads and fibers from solution)

The radiator is characterized by high resistance to corrosion in the process solution for cleaning it and the quality required for chemical yarns and chemical fibers, but has a problem of high cost and short product life.

Techniques are known for a zirconium-based radiator for producing rayon yarns (born 1959, p. 25, translated from the English edition of Zirconium / GA Meerson and Yu.V.Gararinsky.M.IL). Is particularly inexpensive compared to a spinning machine made of a platinum-palladium alloy (75-25) and the chemical yarns and chemical fibers produced have the required quality. However, the zirconium-based radiator has a problem in that the product life is seriously shortened due to the weakness of corrosion in the process solution during cleaning, compared to the radiator of the platinum-palladium alloy (75-25).

 The high viscosity of zirconium strongly adheres to the cutting tool in the manufacture of the spinner, making it difficult to produce precisely aligned and processed orifices, especially diameters of 0.1 mm or less, leading to an increase in manufacturing costs. Chemical yarns and fibers made using low quality spinners can break, resulting in poor quality clothing.

The closest as the prototype technique of the present invention is a radiator made of a zirconium-based material, i.e., a zirconium alloy (consisting of niobium 0.05-1.1 in weight%, 0.001-0.1 in oxygen, 0.01-0.35 in impurities, and zirconium-rest). RF Patent No.2174565, D01 D04 / 02, 2001.)

The spinning machine is considerably cheaper in terms of cost than the conventional spinning machine mentioned above, and the chemist manufactured therein has a certain level of required quality, but also exhibits strong resistance to corrosion in process solutions during washing. However, some of these radiators also exhibit disadvantages due to the zirconium material. That is, the zirconium material of the radiator adheres to the cutting tool, making it difficult to manufacture orifices that are precisely aligned and processed with the correct dimensions and geometry, and also cause problems in cleaning, resulting in a percentage of the weaving yarns and textile fibers. During rewinding without meeting the requirements of 84, chemical yarns or fibers may be defective or damaged.

It is an object of the present invention to solve the problem of adhering to a cutting tool when using a zirconium-based material, the orifice is precisely aligned and processed to extend the life of the spinner and to maintain stability when forming a chemical yarn The production of yarns and chemical fibers with the required level of quality and the corrosion resistance of the emitters is intact.

The above object is achieved with the following configuration. Unlike conventional spinners made of zirconium alloys containing niobium, oxygen, and other impurities, the spinner of the present invention is a zirconium alloy added with nitrogen, silicon, iron, and molybdenum, with a total weight percentage of

Niobium 0.05-1.1, oxygen 0.001-0.2, nitrogen 0.001-0.006, silicon 0.001-0.02, iron 0.001-0.05, molybdenum 0.001-0.005, impurities 0.005-0.26, zirconium balance.

Spinners made of zirconium-based alloys containing various components as described above, can significantly increase the life of the spinner (that is, the time to use replacement), increase the stability in the formation of chemical yarns and chemical fibers, corrosion resistance of the spinner in the cleaning solution It can improve the quality of the yarns (ie, lower the amount of visually defective products in the rewinding process and reduce the amount of damage) without compromising the quality of the yarn. This effect is related to the chemical chemistry mentioned above being introduced into a conventional zirconium alloy and acting on the surface of the radiator orifice, which greatly influenced the structure or quality of the radiator, compared to the prototype or similar prior art solutions of the present invention. (Viscose) lowers the adhesion of the radiator to the wall of the orifice. This is achieved through the electrochemical desirable interaction between the spinning machine and the viscose according to the present invention, and as a result, the process of forming chemical yarns or chemical fibers becomes more stable. When viscose is ejected into the orifice of the spinner according to the present invention, it ensures a more homogeneous and flawless stream, resulting in high quality chemical fibers or chemical fibers (reducing the amount of defects or breakages visually recognized during the rewinding process). Is prepared.

In addition, as compared to the prototype technique of the present invention, the spinner's solution (viscose) has a low adhesiveness to the wall surface of the orifice of the spinner, thereby greatly increasing the life of the spinner (that is, the time to use until replacement). This has the advantage of providing high quality chemical yarns and chemical fibers while reducing the number of radiators required for manufacturing. In addition, the addition of nitrogen, silicon, iron and molybdenum to the zirconium alloy does not reduce the corrosion resistance of the solution when cleaning the spinner.

As a comparative example of the present invention, a platinum-palladium alloy spinner, a zirconium spinner, a spinning machine of zirconium alloy which is a prototype technology of the present invention, and a spinner according to the present invention were tested in a laboratory. For testing, three comparable platinum-palladium spinners having a cap of 12.5 mm diameter and 50 holes of 0.08 mm in diameter, a comparative zirconium spinner with 52 holes each, a zirconium alloy spinner in the circular technique of the present invention , 3 spinners of the present invention were prepared. The length of each cylinder part of the comparison radiator is 0.12 mm. Testing was conducted in a laboratory spinning unit under a program that simulates the production process for the production of polyacrylonitrile (PAN) for technical purposes. For each radiator various experiments were performed until the radiator stopped, statistically analyzing the results obtained and evaluating the possibility of various samples of the four group comparative radiators. The design of the experiment included a large number of control factors characterized by the process of obtaining PAN yarn and the cleaning of the spinner in solution, the physico-mechanical and qualitative factors of the produced chemical company, and the life of the spinner. The resistance of the samples to corrosion in cleaning the spinner in solution was also evaluated according to standard methods. The test results are shown in Table 1.

Analyzing the data in Table 1, it can be seen that the radiator of the present invention differs in the following points compared to the product of the prototype technology of the present invention or other comparative examples. First, the lifetime of the emitter is long (the relative time of use of the radiator until replacement is 1.08 to 1.27, the prototype technology of the present invention is 1, and other comparative examples are 0.58 to 0.64), and then The stability of the fiber forming process is increased (the present invention is high in stability, the prototype technology of the present invention is medium, and the other comparative examples are low), and the quality of the manufactured yarn or fiber is also increased (visual defects The relative index for the present invention is 0.82 to 0.97, the prototype technique of the present invention is 1, and the other comparative examples are 1.15 to 1.2; and the relative index of the amount that the chemist breaks when rewinding is 0.84 Is 0.97, the prototype technique of the present invention is 1, and the other comparative examples are 1.2 to 1.23), even if the spinning machine is washed in solution, the corrosion resistance is not reduced (the relative corrosion rate is And the invention is from 0.72 0.9, and the circular art of the present invention is 0.9, and other Comparative Examples is in the first 1.24).

Samples of chemical yarn (PAN) prepared using a comparative platinum-palladium alloy spinner, a prototype zirconium spinner, and a spinner according to the present invention showed similar physical and mechanical properties such as breaking strength, expansion, coefficient of expansion, and the like.

The optimum zirconium alloy composition ratio of the spinning machine of the present invention is as follows in weight%.

Niobium 0.05-1.1, Oxygen 0.001-0.2, Nitrogen 0.001-0.006, Silicon 0.001-0.02, Iron 0.001-0.05, Molybdenum 0.001-0.005, Impurities 0.005-0.26, Zirconium balance

Reducing the content of zirconium alloys: nitrogen-0.001 wt% or less (experiment 4), silicon-0.001 wt% or less (experiment 9), iron-0.001 wt% or less (experiment 14), molybdenum-0.001 wt% or less (Experiment 19), Impurities-0.05 wt% or less (Experiment 24), which do not show a dramatic increase in spinner life, manufacturing process stability, chemical history or chemical fiber quality, but instead significantly increase the cost of the alloy.

Increasing the content of zirconium alloys: nitrogen-0.006% by weight or more (experiment 8), silicon-0.02% by weight or more (experiment 13), iron-0.05% or more (experiment 18), molybdenum-0.005% by weight or more (Experiment 23), Impurities-more than 0.026% by weight (Experiment 28), it was found that the corrosion resistance of the zirconium alloy in the solution was very low when the spinning was washed.

<Table 1> Property test results for the radiators of various materials

The data are averages of test results for three radiators.

For the purpose of full scale production test of the present invention, a tester of type F41 Tsr12,5 was made in an amount of 500 pieces from a blank made in OAO ChMZ. The test was carried out in OAO "Klinvolokno" to confirm the results mentioned in the detailed description. The zirconium alloy for the sheet was made by melting the nodules from the raw materials of the following composition according to the technique certified by OAO ChMZ.

60%-Class V remanufactured (standard plate from iodine zirconium bar)

40%-Class VI remanufactured after tumbling (forging waste of zirconium alloy E125)

The regenerated niobium, oxygen, nitrogen, silicon, iron, molybdenum and impurity contents are previously determined. The remanufactured product is then classified according to chemical composition and prepared based on the preliminary calculation of the raw material composition to the required amount of each element in the alloy structure.

The nodules are dissolved in a furnace for arch remelting. According to the general technique, the nodules are cut into strips using a roller and then cut into strips. The cap of the spinner is made from the strip by pressing with the drawing.

Thereafter, holes are drilled into the radiator, and the bottom of the radiator is polished with a GOI paste, and the operating holes in the radiator are precisely handcrafted with accurate dimensions and geometry.

Claims (1)

In a zirconium alloy composed of zirconium, niobium, oxygen, and other impurities forming a material of a spinning machine forming chemical yarns and chemical fibers in a solution, Nitrogen, silicon, iron and molybdenum are added to the zirconium alloy to make up the total weight% Niobium 0.05-1.1, Oxygen 0.001-0.2, Nitrogen 0.001-0.006, Silicon 0.001-0.02, Iron 0.001-0.05, Molybdenum 0.001-0.005, Impurity 0.005-0.26 Zirconium Residue Zirconium alloy for a radiator to form a chemical yarn and chemical fiber, characterized in that consisting of.