CS219176B1 - Polypropylene fibers with improved stainability - Google Patents

Abstract

The invention relates to polypropylene fibers modified with nitrogen compounds with improved dyeability, especially when dyeing with surface acid and metal complex dyes. The improvement lies in the deeper diffusion of dyes into the fiber mass, which is achieved by the polypropylene fiber, in addition to amino nitrogen in an amount of 0.1 to 1.0 wt. %, also containing polyethylene glycol with a molecular weight of 600 to 20,000 in a concentration of 0.5 to 5.0 wt. %, always based on the weight of the fibers. The invention can also be used when dyeing polypropylene films with acid and organic dyes

Description

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BACKGROUND OF THE INVENTION The present invention relates to polypropylene fibers with improved dyeability, modified with nitrogen compounds with improved properties, such as the ability of such fibers to receive acidic and metal-complex dyes by diffusion into the larger fibers.

Polypropylene fibers unmodified are only surface-stained with oilophilic dyes, which are soluble in polypropylene, bonded in the mass by vanderwals, and therefore the brightness properties are low, not only for chemical cleaning but also for rubbing, abrasion and abrasion. For these reasons, constantly modifying modifiers with the ability to attract dyes, most often used for dyeing other types of fibers, whether natural or chemical, are required. These modifiers are introduced into the polypropylene either as a physical dough as additives before it is processed into fibers or chemically, more often by seeding onto the surface of the fiber or onto the surface of the initial granulate polymers. In practice, the physical modification, i.e. the additives of the dyeing agents, has proved most successful. In addition to the presence of suitable functional groups, good coloring properties include good technological compatibility with modifiers with polypropylene and a suitable so-called skyprotection of modified polypropylene fibers, which allows diffusion of polar dyes through non-polar polypropylene to individual particulate modifiers dispersed in polypropylene. Even with such a structure, the so-called dust-like dyeing occurs, which means that the dye only penetrates into the surface layers of the fiber, while the fiber remains uncoloured. This has a detrimental effect on the usability of the modifier, the uniformity, and the stability of the fiber dyeing.

We have found that the diffusion of colorants, in particular acid-metal complexes into modified polypropylene fibers, facilitates and accelerates the addition of antistatic polymeric substances such as polyethylene glycols to the polymer mass modified with basic compounds prior to spinning but during fiber production. Polypropylene fibers of the present invention modified with nitrogen compounds in addition to the amine nitrogen at a concentration of 0.1 to 1.0 wt. and a polyethylene glycol having a molecular weight of from 600 to 20,000 at a concentration of 0.05 to 5% by weight, the fiber weight.

Improved colorability has been found in the application of multiple amine modifiers to polypropylene such as copolymers of ethylene and dialkylalkyl esters of acrylic acid or methacrylate, copolymers consisting of a single dialkylaminoalkyl acrylic ester of butbometacrylic and alkyl esters of acrylic acid and methacrylic copolymer of 2-vinylpyridine and acid. acrylic or methacrylic, polyamine triazoles, polyamide ureas, copolyamides, piperazine co-polycondensates, acrylic acid alkyl esters and hexamethylenediamine, and others. Before spinning, 8 wt.% Of the propylene melt is added to the melt. of a methacrylic acid / ethylene diethylalkylaminoethanol copolymer with an amine nitrogen content of 2.2% in the melt, representing 0.176 wt. this nitrogen in the fiber. The two melts are homogenized in a dynamic mixer and the mixed melt is fibrillated at 260 ° C to filaments that deposit at 6 ° d at 120 ° C in a 1: 4 split ratio.

In a similar manner, a fiber is prepared where polypropylene containing 1 wt. Polyethylene glycol average molecular weight 6,000 and the same modifier at a concentration of 7% w / w. The fiber prepared under the same conditions will be subjected to surface dyeing with acid dyes, such as Tumor Blue E, Tumor Red PRS, Suminol East Blue PR, Suminol Milling Scarlet G at 2% w / w the fiber in the bath pH 4 and the aromatic ester carrier at 0.2% by weight of the fibers.

Similarly, dyed fibers without polyethylene glycol are similar. Fiber containing polyethylene glycol with a molecular weight of 6000 is more dye-colored and faster when using the above-mentioned dyes, the dyeing bath was completely drawn out and the fiber cross-section indicated by farbivamibole was more extensive than shown in Table 1 below.

Table 1 8% Polyethylene glycol modifier 7% 1% Polyethylene glycol modifier Colorant% Pre-Fabricated% Pre-Fabricated Fabric Bleached Blue EMidium Red 39 64 PRS Suminol Fast Blúe 31 49 PR Suminol Milí. Scar- 60 71 years G 55 64 Example 2

Fibers were prepared similar to Example 1 except that polyethylene glycol with a molecular weight of 20,000 at a concentration of 2% w / w was used. and a copolymer of a nitrogen modifier modified with dimethylalkylaminoethanol with an amine nitrogen content of 2.2 wt. as in Example 1, at a concentration of 7 wt%, corresponding to 0.154 wt% nitrogen in the fiber.

The fibers were stained as in Example 1. It was found again that fibers containing polyethylene glycol with a molecular weight of 20,000 were more saturated

Claims (1)

4 colored, the cross-section of the fiber more colored with polyethylene glycol-free fibers was 95%. Table 2 shows an increase in fiber cross-section color. Table 2 8% Polyethylene glycol 7% Modifier 2% Polyethylene Glycol Modifier Dye% prefar% of the bleached cross section of the mulch blue E 40 80 Poppy Red PRS 33 61 Suminol Fast Blue PR 61 85 Suminol Milí. EXAMPLE 3 5 parts by weight of a polyaminotriazole-based modifier with a content of 7.2% by weight of nitrogen-containing nitrogen were added to 95 parts by weight of polypropylene powder. After homogenization, the mixer was melted and granulated. The prepared granulate with an amine content of 0.3.6% wt. is spun at a temperature of 260 ° C, the fibers being cut at a temperature of 120 ° C by a 1: 4 ratio to a final fineness of 6 dtex. In the same manner, a fiber from polypropylene granulate containing 93 parts by weight of polypropylene, 5 parts by weight of polyaminotriazole and 2 parts by weight of polyethylene glycol having a molecular weight of 20,000 is also prepared. the fiber containing polyethylene glycol stains more vividly, the bath after the dyeing is drawn to 89%, whereas for the fibers without polyethylene glycol only to 81% and the color of the fiber in cross-section is more than shown in Table 3. Table 3 95 wt. d., 93 wt. d. Polypropylene polypropylene 5 wt. d. poles-5 wt. d. Polyaminotriaz. aminotriaz. 0 wt. d. poles-2 wt. d. Polyethylene glycol. ethylene glyc. Colors in o -% prefarbe-% prefabricated cross section cross-section blue Blue 31 31 Sweet red PRS 25 38 Suminol Fast Blue PR 43 64 Suminol Milí. Example 4 a) 6 parts by weight of polyamide urea containing 9% by weight of amine nitrogen are added to 94 parts by weight of poly (propylene) powder. After homogenization in a high-speed mixer, the mixture is remelted and granulated. Prepared: granulate with an amine nitrogen content of 0.54% wt. fibers are spun at a temperature of 120 ° C in a 1: 4 ratio to a final fineness of 6 dtex. Also, fibers from polypropylene granules containing: b) 93 parts by weight of polypropylene, 6 parts by weight are prepared. polyamideurea and 1 part by weight of polyethylene glycol with molecular weight of 20,000 sc) 91 parts by weight of polypropylene, 6 parts by weight of polyamideurea and 3 parts by weight of polyethylene glycol with molecular weight of 20,000. according to 4c, containing 3 parts by weight of polyethylene glycol β with a molecular weight of 20,000, the dye is more saturated, the dyeing bath is drawn to 85%, the fibers of 4b containing 1 part by weight of polyethylene glycol having a molecular weight of 20,000 are only 77% % and 75% for polyethylene glycol 4a. The dyeing crosses mainly above the fiber containing 3 parts by weight of polyethylene glycol, as shown in Table 4. Table 4 a b c Polypropylene wt. d. 94 93 91 Polyamide urea wt. d. 6 6 6 Polyethylene glycol wt. d. 0 1 3 Dyeing% dyeing of fiber cross-sections Bleach blue E 42 44 61 Poppy red PRS 29 30 39 Suminol Fast Blue PR 44 47 66 Sum. Milling Scarlet G 41 43 63 OBJECT OF THE INVENTION Polypropylene dye-enhancing dyestuffs modified with α1 and dye modifiers in an amount corresponding to 0.1 to 1.0% by weight. characterized in that the polypropylene fibers, in addition to the amine nitrogen monomer, still contain polyethylene glycol having a molecular weight of 600 to 20,000 at a concentration of 0.5 to 5% by weight. on fiber weight.