SU480781A1 - The method of obtaining modified acetate fibers - Google Patents

Description

one

The invention relates to the production of chemical fibers, in particular to the modification of properties of acetate fibers.

Various methods are known to improve the properties of acetate fibers, for example, by introducing modifying additives into the dope of the secondary cellulose acetate. Compounds of various classes, in particular methylol derivatives, are used as modifying additives. It is known to introduce dimethylolurea dialkyl ethers with acidic catalysts into the dope of secondary cellulose acetate. There is also known a method of modifying cellulose acetates by introducing up to 8% of water-soluble N-methylol heterocyclic compounds, in particular dimethylethylene urea (DMEM), and a catalyst — magnesium chloride into the dope of cellulose acetate. After heat treatment at 170 ° C for 15 minutes, the modified fibers acquire heat resistance, light resistance, and insolubility in organic solvents. However, the introduction of an additional heat treatment operation complicates the technology for producing acetate fibers.

In order to increase the stability of the process of forming acetate fibers and reduce their defectiveness as N-methylol derivatives, it has been proposed to use methylolmelamine-2, 4, 6-triaminoyl-triazone cyanurtriamide or methazine in an amount of 0.5-2% by weight of cellulose acetate.

During the implementation of the proposed method, the breakage of the yarn during molding and the defectiveness of the yarn are significantly reduced, which reduces scrap and improves the performance properties of acetate yarns. In addition, an increase in the stability of the process of forming the acetate filament reduces simple spinning equipment.

Example 1. In a spinning solution of cellulose acetate in an acetone-water (95: 5) solvent mixture, 1% (by weight of polymer) methyl methane-amine-2, 4, 6-triamine burn-triazone cyanurtriamide is added. Forming acetate threads No. 150 from a spinning solution containing a modifying additive is carried out on a PA-240-I machine at a speed of 550 m / min. The temperature of the water in the spinning head is 85 ° C. The temperature of the supplied air is 78 ° C. The number of revolutions of the spindle is 6000 rpm.

In tab. 1 and 2 show the properties of the spinning solutions and the physicomechanical parameters of the yarns obtained; in tab. 3 shows the number of intraobin defects per 100 M filament.

Table I

threads when molding and reducing the defectiveness of the thread.

Example 3. In a single solution of cellulose acetate in a solvent mixture of acetone water (95: 5), add 2% (by weight of the polymer) methylolmelamine-2, 4, 6-triamine-triazone cyanurtriamide. In the preparation of the spinning dope, the modifier is pre-dissolved in water-acetone

the mixture and after half an hour of stirring load cellulose acetate. Molding

table 2

Table 3

Example 2. In a spinning solution of cellulose acetate in a mixture of acetone-water solvents (95: 5), add 0.5% (by weight of polymer) of methazine, a hydroxymethyl melamine derivative. The molding of thread No. 90 from a spinning solution containing a modifying agent is carried out according to Example 1. The properties of the spinning solutions and the physicomechanical indicators of acetate yarns are given in Table. four.

Thus, with the introduction of 0.5-2% methyl melamine derivatives into the dope of cellulose acetate, a significant decrease in breakage is observed.

acetate filaments No. 90 from the spinning solution, containing its modifying additive, are carried out on a PA-240-I machine at a speed of 550 m / min. The physicomechanical indicators and indicators of the stability of the formation of the obtained yarns are given in Table. five.

Example 4. To a dozen solution of cellulose acetate in a mixture of acetone-water solvents (95: 5), add 2% (by weight of polymer) methazine. The preparation of the solution and the molding of the yarn No. 90 from the spinning solution containing the modifying agent are carried out as in Example 1. The properties of the spinning solutions, the stability characteristics of the molding and the physicomechanical indicators of the acetate yarns are given in Table. 6

The results of testing the resistance to double bending of modified filaments containing 1% methylolmelamine-2, 4, 6-triamino-sml {l-triazoncyanurtriamide are given below.

Table 4

Double bends, cycles

546.5

Acetate filaments with the addition of 1%

methylolmelamine592,5

The results of the abrasion resistance test of modified filaments containing 0.5% of methazine.

Abrasion resistance

cycles Control threads

(no additives) 36

Acetate filaments with the addition of 0.5% methazine97

Table 5

Table 6

Subject invention

The method of obtaining modified acetate fibers by forming a spinning solution containing N-methylol derivatives, characterized in that metlmelamine-2, 4, b-triamino-smzhl are used as N-methylol derivatives in order to increase the stability of the forming process and reduce the defectiveness of the fiber triazone cyanurtriamide or methazine in the amount of 0.5-2% by weight of cellulose acetate.