RU2541062C2 - Fluorescent fibre, use thereof and methods for production thereof - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering of fibre materials and to fluorescent fibre, use thereof and methods for production thereof. Reclaimed cellulose fibre contains red pigment inclusions and a fluorescent dye deposited by subsequent colouring. The fibre satisfies EN 471 standards with respect to luminance factor, chromaticity coordinates and colour fastness, and is also characterised by light fastness greater than 5, measured according to ISO 105-B02, method 2.

EFFECT: invention enables to obtain fibre for use in protective clothes and clothes with reflecting properties, which satisfies the requirement for background materials in accordance with the EN 471 standard.

11 cl, 2 tbl, 2 ex

Description

Technical field

The object of the present invention are cellulosic regenerated fibers with fluorescent properties for use in clothing with reflective properties, such as, for example, described in standard EN 471, their use for producing threads and fabrics and a method for producing these fibers.

State of the art

EN 471 applies exclusively to the preventive effect of personal protective equipment, in particular to clothing with reflective properties. Typically, protective clothing contains fluorescent background material and retroreflective material. In accordance with the present invention, a material that emits radiation with a longer wavelength than the wavelength of the absorbed radiation is referred to as a fluorescent material as defined in EN 471; hereinafter, the term "high visibility material" is used for this. The present invention relates to a fluorescent background material, and not to retroreflective materials.

Until now, high visibility textiles have mainly been manufactured on the basis of synthetic fibers and, in particular, polyester, which, however, has inherent disadvantages in terms of wearing comfort and safety. The disadvantages of such textile products are, in particular, in conditions that are unacceptable to the skin and in the appearance of an unpleasant odor after wearing for a long period of time due to insufficient moisture-regulating properties of the material, as well as the danger of electrostatic discharge typical of synthetic fibers.

An alternative is textiles with a complex structure, the outer side of which contains a component with high visibility, and the inner side of which mainly contains cellulose fibers to improve wearing comfort, such as, for example, disclosed in document WO 2006/017709. Today, mainly fibers obtained in accordance with the viscose process and the process for producing lyocell fibers are known as regenerated cellulose fibers. These fibers are obtained all over the world for standard applications in the field of textile and non-woven materials with a single fiber titer of 0.8 to 16 dtex.

In fact, the cellulosic regenerated fibers can be dyed with fluorescent dyes using a standard dipping method in a bath. However, fibers so dyed do not meet the requirements for light fastness (ISO 105-B02, method 2> 5). After irradiation with xenon lamps, they fade to a large extent and their shade undergoes a significant change. Moreover, the color depth is significantly reduced, which can, for example, be defined as the shift of the chromaticity coordinates.

In recent decades, it has been discovered that dyeing viscose fibers can be performed in a permanent manner in a permanent manner by incorporating coloring pigments. Suitable fibers are commercially available. However, there is still no pulp-dyed regenerated fiber that meets the requirements of EN 471.

SUMMARY OF THE INVENTION

Considering the prior art, it is an object of the present invention to provide a fiber which, on the one hand, satisfies the requirements for protective clothing and clothing with reflective properties, for example according to EN 471, and on the other hand provides wearing comfort and resolving the safety-related problems of this garment, taking into account economic feasibility. On this basis, it becomes possible to obtain protective clothing and clothing with reflective properties from such fibers without adding other types of fibers. In this regard, it is extremely important that textiles made from these fibers meet the following requirements for background materials in accordance with EN 471:

- Luminance factor (standard values in accordance with the publication of the CIE (International Committee for Color Science) No. 15.2) and color coordinates;

- Color after irradiation with xenon lamps: the impact on the sample is performed in accordance with ISO 105-B02, method 3;

- Resistance to dry and wet abrasion (ISO 105-A02).

In addition, the light fastness of the fibers is determined in accordance with ISO 105-B02, method 2.

Furthermore, an object of the present invention is to provide a suitable method for producing these fibers.

Unexpectedly, a solution to this problem was made possible through the use of cellulose regenerated fibers that contain the included coloring pigment and fluorescent dye applied as a result of subsequent coating dyeing. These fibers in accordance with the present invention are characterized by light fastness - measured in accordance with ISO 105-B02, process 2 - more than 5, in addition to improved wearing comfort and increased safety due to the basic structure of the pulp. This was unattainable with the previously known fibers.

In addition, the fibers satisfy the other values set forth in EN 471 in terms of abrasion resistance, perspiration resistance, resistance to washing, resistance to dry cleaning, resistance to bleaching with hypochlorite, and ironing resistance.

Bulk dyed regenerated fiber can be obtained using a viscose process, a modified viscose process (for example, a Modal process, a zinc-free viscose process with aluminum sulfate, etc.), as well as a solvent process using organic solvents such as molten aqueous amine oxides or also so-called ionic liquids. Fibers may be respectively designated as Viscose, Modal and / or Lyocell. Cellulose regenerated fiber may contain other additives. According to one preferred embodiment of the present invention, the cellulosic regenerated fiber further comprises a flame retardant.

One preferred embodiment of the flame retardant fiber is made by incorporating the flame retardant in the form of pigments. In addition to other types, organophosphorus compounds can be considered as flame retardants in the form of pigments, for viscose, for example, 2,2'-hydroxybis- [5,5-dimethyl-1,3,2 -dioxaphosphorin] -2,2'-disulfide, available under the trademarks Exolit® or Sandoflam®.

According to another preferred embodiment of the present invention, the cellulosic regenerated fiber also contains a bactericidal substance. For this, substances known to a person skilled in the art can be used.

Subsequent staining with high visibility dyes by immersion in the bath can be done using dyes suitable for cellulosic materials (e.g. reactive dyes, direct dyes, vat dyes, etc.).

Subsequent coating dyeing, for example dipping in a bath, may be subjected to a bundle of dyed fibers, a yarn containing dyed fibers, or a fabric containing dyed fibers. For this, mainly continuous or intermittent staining processes known to the person skilled in the art can be used.

By making the right choice of pigment for dyeing in bulk and a high visibility dye for dipping in the bath, color shades can be obtained for which there are still no individual solutions.

The object of the present invention is also the use of fibers in accordance with the present invention to obtain filaments. To indicate features within the scope of use, a similar yarn in accordance with the present invention may contain fibers of a different origin in addition to the fibers in accordance with the present invention, for example, (flame retardant) polyester, Modacryl, para- and meta-aramide, polyamidimide (Kermel® ), (flame retardant) wool, polybenzimidazole (PBI), polyimide (P84®), polyamide, (flame retardant) polyamide, flame retardant acrylic fibers, melamine fibers, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), fiberglass a, cotton, silk, hydrocarbon fibers, oxidized thermally stabilized polyacrylonitrile fibers (PANOX®) and conductive fibers, as well as mixtures of these fibers. According to one preferred embodiment of the present invention, the mixed constituents may also be susceptible to coloring with high visibility dyes.

Similarly, the use of fibers in accordance with the present invention to obtain tissue is an object of the present invention. In addition to the fibers of the present invention, this fabric may also contain other fibers, for example (flame retardant) polyester, Modacryl, para- and meta-aramid, polyamidimide (Kermel®), (flame retardant) wool, polybenzimidazole (PBI), polyimide ( P84®), polyamide, (flame-retardant) polyamide, flame-retardant acrylic fibers, melamine fibers, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), fiberglass, cotton, silk, hydrocarbon fibers, oxidized thermally stabilized polyacrylonitrile fibers (PANOX®) and conductive fibers,and mixtures of these fibers. According to one preferred embodiment of the present invention, other fibers can also be dyed with high visibility dyes.

Preferably, the fabric is a woven product, a warp knit product or a knit product, but also mainly can be a nonwoven product. In the case of a woven or knitted product, the mixture of fibers in accordance with the present invention with other fibers can be performed by mixing before yarn, the so-called homogeneous mixture, or by sharing in each case clean yarns of different types of fibers to obtain woven, knitted and knitted products .

Similarly, an object of the present invention is also the use of fibers in accordance with the present invention to obtain a garment with reflective properties or another type of garment with reflective properties, moreover, the above-mentioned yarns and / or flat textile structures usually look like intermediate elements in a textile basis. In the framework of the present invention, other types of objects with reflective properties should be understood, for example, pennants, flags, warning tapes and the like, which are characterized by very good visibility and / or attract attention well. Thus, the use in accordance with the present invention goes beyond the purely preventive effect. If non-woven fabric is used as the fabric, as mentioned above, for example, for use in pennants, flags, warning tapes and the like, then, of course, the intermediate thread is not used. Various embodiments of garments or other articles with reflective properties of this type are well known to those skilled in the art and therefore will not be further described.

Similarly, the method for producing the above-mentioned fluorescent cellulose regenerated fibers in accordance with the present invention is also an object of the present invention, according to which a coloring pigment is included in the fibers and subsequent coating dyeing of these fibers is carried out by means of a fluorescent coloring material in a subsequent step of the method. Inclusion is usually carried out by adding coloring pigments to the dope. Inclusion processes of this type are generally known to those skilled in the art for the viscose spinning process, Modal spinning process, and the solvent spinning process. However, pulp-dyed pulp fibers are usually not subjected to subsequent top-coat dyeing at a different stage with another dye, since the pulp dyeing process in the pulp is generally known as a very effective method by which high resistance values can be obtained, including abrasion resistance and light resistance, and to wash and sweat. However, the present invention, which provides a subsequent top-coat dyeing step in a subsequent step, fulfills the special requirements for cellulose fibers for clothing with reflective properties.

Subsequent topcoat, i.e. dyeing by immersion in a bath can be subjected to a bundle containing dyed fibers, or a thread or textile structure containing dyed fibers. For this, continuous and intermittent dyeing processes, generally known to those skilled in the art, can be used.

The present invention will now be explained by way of examples. Examples should be considered as possible embodiments of the present invention. Therefore, the present invention will not be limited by the scope of these examples.

Example 1

Bulk dyed fire-resistant viscose fibers contain 1.25 weight percent yellow 3 pigment (eg Aquarine Yellow 10 G) and 22 weight percent 2,2'-hydroxybis- [5,5-dimethyl-1,3,2-dioxaphosphorine] - 2,2'-disulfide (Exolit 5060, Clariant) in all cases with respect to cellulose. This fiber is then subsequently dyed using Remazol Leuchtgelb FL (DyStar) in accordance with the following method.

The bunch is placed in a dye bath containing 2% Remazol Leuchtgelb FL (DyStar company) and 100 g / l sodium sulfate, with a ratio of tissue mass to the mass of the dye solution: 1:10 and an initial temperature of 25 ° C, and also with a heating rate of 1 ° C per minute to 50 ° C. After 10 minutes at this temperature, soda is added in an amount of 5 g / L, and after 30 minutes NaOH (at a concentration of 50%) in an amount of 1.2 ml / L is added. After another 40 minutes, the dye bath is allowed to cool, and then an additional treatment follows, providing for the stages known to the person skilled in the art: rinse - rinse - rinse - rinse. After that, the fiber is dried and a woven product is made from it. This product was tested, the results of which are shown in table 1. These results demonstrate that the fibers, yarns and textiles obtained in accordance with the present invention are excellent for use in clothing with reflective properties and do not fade.

Table 1 Test results (for example 1) At the beginning After exposure (ISO 105-B02, method 3) Brightness factor 0.7304 0.7282 Color coordinates X coordinate 0.3830 0.3852 Y coordinate 0.4917 0.4915 Resistance to abrasion (dry and wet) four Light fastness (ISO 105-B02, method 2) 5-6

Example 2 (comparative example)

Commercially available viscose fiber (LENZING FR), also subjected to flame retardant treatment with Exolit 5060, which does not contain dye pigment included, was subsequently coated with the coating method used in Example 1. In this case, 6% Remazol Leuchtgelb FL (DyStar company) was used instead 2%, as in example 1. The fibers demonstrate the test results shown in table 2.

table 2 Test results (for example 2) At the beginning After exposure (ISO 105-B02, method 3) Brightness factor 0.7666 0.7011 Color coordinates X coordinate 0.3711 0.3920 Y coordinate 0.5184 0.5067 Resistance to abrasion (dry and wet) four Light fastness (ISO 105-B02, method 2) 3-4

As a result of exposure, the hue and color depth of the fibers of the prior art in Example 2 underwent stronger changes than the fibers in accordance with the present invention from Example 1, which can be clearly seen from the strong shift of the chromaticity coordinate values. Similarly, as a result of exposure, there was a more pronounced decrease in the brightness coefficient of the fibers of the prior art compared with the fiber of the present invention. However, the most serious indicator is the poorer light fastness of the fiber according to Example 2 compared to the fiber in accordance with the present invention according to Example 1.

Claims (11)

1. A cellulosic regenerated fiber that contains an included dye pigment and a fluorescent dye, which is deposited by a subsequent coating dye, and characterized by a light fastness of more than 5, measured in accordance with ISO 105-B02, method 2. 2. The cellulose regenerated fiber according to claim 1, obtained in accordance with the process for producing Viscose, Modal or Lyocell. 3. The cellulosic regenerated fiber according to claim 1, which is also characterized by flame retardant treatment. 4. The cellulosic regenerated fiber according to claim 3, in which the flame-retardant coating is an incorporated organophosphorus compound (preferably 2,2′-hydroxybis- [5,5-dimethyl-1,3,2-dioxaphosphorin] -2,2′-disulfide) . 5. The cellulosic regenerated fiber according to claim 1, additionally containing a bactericidal substance. 6. The use of fibers according to claims 1-5 to obtain the thread. 7. The use of fibers according to claims 1-5 for obtaining tissue. 8. The use of fibers according to claims 1-5 for obtaining a garment with reflective properties or another object with reflective properties. 9. The method of producing fluorescent cellulose regenerated fibers according to claims 1-5, characterized in that the dye pigment is included in the fibers and subsequent coating dyeing of these fibers is carried out by means of a fluorescent dye at a subsequent stage of the method. 10. The method according to claim 9, in which subsequent coating staining is performed at a continuous or discontinuous stage of the method. 11. The method according to claim 9 or 10, in which subsequent coating dyeing is applied to a thread or fabric made from regenerated cellulose fiber.