The production method of the thread covered with overabsorption

 

The invention relates to the technology of yarn supplied overabsorbed material that can be used to obtain waterproof cables optical communications as reinforcing elements. The original thread is applied an aqueous solution containing water-soluble precursor overabsorbed material is dried and heated to structure or polymerization of the specified predecessor and turning it into an absorbent material. Obtained a multi-fiber yarn has excellent water-absorbing ability without the use of organic solvents or excess water. 5 C.p. f-crystals, 7 PL.

The invention relates to a method for producing yarn supplied overabsorbed material.

This thread can be used in cables, more specifically in the cables, optical communications, in this case it functions simultaneously as an amplifying element and as a water blocking agent.

Thread supplied overabsorbed material, and the production of such filaments is known from European patent applications 482703 and 351100, U.S. patent 5635569 and International application WO 93/18223. According to these prannoy thread is dried, so in and around voids threads formed film. The resulting product is used as a reinforcing material for receiving the communication cable with water blocking properties.

However, there are disadvantages of the above methods of application overabsorbed material on the surface of the cable or filament. A major disadvantage is the selection of organic materials, in particular of isohexadecane, during the drying process thread. These materials create an unacceptable burden on the environment, and isohexadecane should be removed by burning or by processing in the installation of flue gas. This stage requires expensive equipment and consumes significant amounts of energy. Therefore, it is useful to exclude the application of water-in-oil emulsions and apply materials that are soluble in water.

Hindrance for impregnation of aramid yarn overabsorbed material is the fact that because of the increasing viscosity of the action overabsorbed uniform material feed it extremely difficult, if not impossible. In addition, due to the limited concentration overabsorbed material in the impregnating liquid, only a small amount it can be Nan is STV impregnating liquid, which is applied to the thread with overabsorbed material must be removed again by evaporation.

This invention eliminates the above disadvantages. Moreover, the invention provides a multi-fiber aramid yarn with excellent water-absorbing ability without the use of organic solvents or excessive amounts of water.

The invention relates to a method for producing yarn supplied overabsorbed material having a degree of swelling at least 60 and having hydrophilic properties which is able to absorb and hold water quantity, which differs in that an aqueous solution containing water-soluble precursor overabsorbed material is applied to the thread, then the thread is dried and heated in order to structure or polimerizuet soluble in water predecessor overabsorbed material to transform it into overabsorbed material.

Thus, no overabsorbed material, as such, no longer use, and use water-soluble precursor, which after heat treatment is polymerized or structured education overabsorbed material. This will gain the sizing.

The obtained fiber must have a degree of swelling of more than 60. The degree of swelling is a measure of the amount of water absorbed by a thread, when it comes into contact with water in liquid form. The method of experimental determination of the degree of swelling will be explained in more detail below. Found that thread according to the invention has a degree of swelling comparable to the above-mentioned previously known threads. Preferably the degree of swelling, the yarn according to the invention is equal to at least 80, more specifically at least 100, and even more specifically at least 150.

The term multi-fiber thread has is that he usually has in the technique, meaning that the fibers from which it is made are infinite elementary fibers (filaments). Textile terms and definitions (1988), pages 289-290 provide information in this respect. In the framework of the invention, the fibers used in the manufacture of filaments according to the invention, are elementary fibers, which can have any linear density, in normal practice, and the threads can be made of any desired infinite number of elementary fibres. Typically, elementary fibers or consisting of these threads will be II of 1-20000 elementary fibers.

As appropriate types of fibers can be made of organic fiber and inorganic origin. Fibers of organic origin can be either natural or synthetic. Examples of natural fibers include cellulosic fibers such as cotton, flax, jute, etc., and animal fibers such as wool, silk, etc., Examples of synthetic organic fibers include fibers of regenerated cellulose, rayon, polyesters, aliphatic and aromatic polyamides, Acrylonitrile, polyolefins, polyvinyl alcohol, polyvinyl chloride, polyster, elastomers and carbon. Examples of inorganic fibers include fibers of glass, metals, silicon dioxide, quartz, etc., ceramic fiber and mineral wool. In addition, can be used fibers made from blends of these materials or their copolymers, or mixtures of these fibers. The above-mentioned types of fibres and other, suitable for use in the method according to the invention, are described in Kirk-Othmer, Encyclopedia of chemical technology, 3rd edition, volume 10 (1980), pages 148-197.

The preferred fibers consisting of aramid, politicsthe basics are fiber, containing two or more of the aforementioned materials, for example two-component fiber. They may be sheath-core or side-by-side or any other well known type. Other suitable types of fibers are satellite fiber or split fibers.

The fibers may be either solid or hollow. They can be round or flat or any other desired cross section, such as elliptical, triangular, star-shaped, kidney, etc.,

Aramid fibers are the most preferred. Under aramid fibers means according to the invention fiber containing polymers, built entirely or essentially of repeating units of General formula,and/orHere A1And2and a3represent different or the same, divalent, containing one or more aromatic rings hard radicals, which may also contain a heterocyclic ring, continuing the chain of communication these radicals are in the para-position to each other or are parallel and oppositely directed. Examples of such reprimer halogen atoms or altergroup. In addition to amide groups and the above-mentioned aromatic radicals of the molecule chain aromatic polyamides optionally can contain up to 35 mol. % other groups such as m-phenylene, non-rigid group such as altergroup or group of simple ether, urea group or group of ester. Preferably aramid yarn made wholly or partly, more specifically more than 90%, of poly(p-phenylene-terephthalamide).

Under the predecessor overabsorbed material means according to the invention the material after heating is polymerized or structured education overabsorbed material having hydrophilic properties which is able to absorb and retain a relatively large amount of water, optionally under pressure. In order to simplify the application of the solution on the thread, it is necessary that the precursor overabsorbed material dissolved in the aqueous solution had a viscosity of less than 1000 mm2with-1. Preferably the viscosity is less than 500 mm2with-1and most preferably between 10 and 200 mm2with-1. Particularly suitable for use as precursors absolutely and polymers, derived from acrylamide, acrylamide and sodium acrylate and acrylamide and dialkylaminoalkyl. These compounds are selected from groups of the water-soluble non-ionic, anionic and cationic monomers, oligomers and polymers, respectively. Examples of precursors of overabsorption, which can be used in the production of yarns according to the invention, includes: forming a cross-link the acrylic acid, partially neutralized to the sodium salt, potassium polyacrylate, oligo - or copolymers of sodium acrylate and acrylamide, derivatives of copolymers of acrylic acid and acrylamide, triple oligo - or triple-polymers of acrylamide and monomers containing carboxyl groups and sulfopropyl, (sodium salt), polyacrylamide oligo - or polymers. Preferably as a predecessor overabsorbed material used is derived from polyacrylic acid or a derivative of a copolymer of acrylamide and acrylic acid.

The term derivative refers to that part of the carboxyl groups is in the form of a salt, preferably potassium or sodium.

Filaments of the invention is manufactured using the method, when the surface of the filaments provide a layer of an aqueous solution, steriade is spartia and thereafter or simultaneously heated, in order to structure or polimerizuet predecessor overabsorbed material. To the aqueous solution of the precursor overabsorbed material optionally may be added a crosslinking agent (linker) or a polymerization catalyst.

The method of producing yarns according to the invention allows to obtain high-quality aramid yarn having overabsorbed properties economically without the use of expensive equipment for subsequent combustion of organic solvents.

The number of overabsorbed filaments are chosen so that achieve favorable properties block water when the thread used in the cables. Favorable results are usually obtained if the thread contains 0.3 to 10 wt.%, preferably 0.5 to 5 wt. % and more particularly from 0.6 to 2 wt.% overabsorbed material.

When an aqueous solution is applied, the thread is dried. In this process the water is completely or mostly removed from the thread by evaporation so that the surface of the thread remains uniform layer overabsorbed material.

Drying is carried out in accordance with conventional ways, where possible the use of appliances, such as hot drums, hot sheets, goratory drying 50-300oC. the Heating is carried out at 100-300oC. Preferably the drying and heating takes place simultaneously with 100-250oC.

The method of producing yarns according to the invention can be carried out in various ways.

In a fully continuous manner, which is directly connected with the process of forming filaments, an aqueous solution containing the precursor of overabsorbed, may be deposited on the washed filament, after which the thus treated yarn is dried and heated. According to other variant embodiments, the subroutine predecessor of overabsorbed present in the aqueous solution takes place in a separate process, not associated with the molding process.

The method of producing yarns according to the invention is particularly suitable for use in combination in the same stage of the method with heat treatment for structuring or polymerization of the precursor absorbent material as it is used in the production of aramid fibers with high modulus.

In Kirk-Othmer, Encyclopedia of chemical technology, 3rd edition, vol. 3 (1978), pp. 213-242 the brief summary of receipt and forming aromatic polyamides. The most appropriate technology wet molding of poly(p-phenylene-t the density and any infinite number of elementary fibers, common in current practice. Typically, the thread will have a linear density of from 10 to 20000 dtex and may be composed of 10 to 20000 elementary fibers.

Overabsorbed material deposited on the filament according to the invention, should not adversely affect the main mechanical properties of elementary fibers.

Strength aramid yarns according to the invention is 1.0-3.5 N/Tex or greater, preferably 1.5 to 2.5 N/Tex. The elongation at rupture is 0.5-10%, preferably 1-8%. The modulus of elasticity at low short-term loads equal 20-130 N/Tex or greater, preferably 30-90 N/Tex.

Like the appropriate thread, not processed overabsorption, thread according to the invention has a relatively low water content after drying even after a stay in the air for a longer period of time. After conditioning the dried aramid yarn at 20oC and 65% relative humidity for 4 weeks she has a water content not exceeding 10 wt.%, more specifically not more than 7 wt.%.

The procedure for determining the degree of swelling of the filaments according to the invention is as follows.

About 10 g of the thread, which should be investigated, cut into n is centralised water with a temperature of 20-22oWith in a beaker with a capacity of 800 ml In 60 seconds (stopwatch) sample fiber remains submerged in a state of complete rest, i.e. without stirring, shaking, vibration or exposure to some other kinds of movement. Immediately after that, all the contents of the glass, i.e., fiber and water, transferred into the bag (dimensions: approx 10x15 cm) made of polyester tulle curtain (cell size 1,5x1 mm). In this process water mostly flows through the cell tulle curtain, while the fibers remain in the bag. Then the bag and its contents immediately transferred into a centrifuge and then centrifuged for 120 seconds (stopwatch), removing the thus still held water from the impregnated sample fiber. Use a centrifuge AEG type SV 4528 (ex AEG Aktiengesellschaft, D-8500 Nuremberg), which operates at the speed (rotational speed) 2800 rpm and has a centrifugal drum with an internal diameter of about 24 see Immediately after centrifugation the sample fibers are transferred from the bag in the weight of the camera using a pair of weaving forceps and weighed with a precision of 0.0001 g (the weight of the fiber: grams). The sample fiber in the weight of the camera then dried to constant weight in an air oven at 105oC. Usually Aut accurate to 0.0001 g (the weight of the fiber: grams).

The degree of swelling thread count by the following formula:Each definition is performed twice and the average results. Due to the characteristics mentioned here previously, the filament obtained according to the invention is extremely well suited for use as a reinforcing filaments with a high water blocking ability. Therefore it is best suited for use in cables, more specifically in the cables optical communications.

Hereinafter the invention will be explained with reference to the following examples.

Example 1 19% solution of sodium polyacrylate in water (Mirox W 60336, ex Stockhausen GmbH, Krefeld, Germany, the viscosity of 122 mm2with-1determined by measuring Ubbelohde) then dissolved in demineralized (Demin) water. The solution was applied to the raw thread Twaron(1680 dtex/f 1000) by means of a dosing pump and the applicator. After drying in a steam chamber (length 10 m, 200-220oC, 15-60 (C) determine the degree of swelling. The content of Mirox thread is defined as equal to 2 wt.%.

The results are shown in table I.

For shorter periods of heating does not occur structuring or polymerization, and therefore, stee, 200oC) or on a hot plate (length 42 cm, 150oC).

Example 2 15% solution of a copolymer of sodium acrylate and acrylamide in water (Produkt W 63194, ex Stockhausen GmbH, Krefeld, Germany, viscosity 191 mm2with-1determined by measuring Ubbelohde) then dissolved in demineralized (Demin) water, and optionally add a solution Giyoxal (waves. the solution of the dialdehyde glyoxal; ex Sigma-Algrich Chemie bv, Zwijndrecht, The Netherlands), Sarpifan MKV (liquid modified melamine resin in water; ex Stockhausen GmbH, Krefeld, Germany), Breox 50A50 (ethoxylated and propoxycarbonyl butanol; ex INSPEC, Southampton, UK) and/or Leomin AN (ethoxylated phosphonate potassium salt; ex Clariant, Frankfurt, Germany) (see table II). The solution was applied to the raw thread Twaron(1680 dtex/f 1000) by means of a dosing pump and the applicator. After drying in a steam chamber (length 10 m) determine the degree of swelling. Tables III-VII show the effect of sizing on the thread and the effect of time and temperature.


Claims

1. The production method of the thread supplied overabsorbed material having a degree of swelling at least 60 and having hydrophilic properties which is able to absorb and abstain warily in aqueous solution and having a viscosity of less than 1000 mm2with-1after which the thread is dried and heated in order to structure or polimerizuet soluble in water predecessor overabsorbed material to transformation into insoluble in water overabsorbed material.

2. The method according to p. 1, characterized in that then stage of application to the thread sizing.

3. The method according to p. 1, wherein the aqueous solution further comprises a sizing.

4. The method according to any of paragraphs. 1-3, characterized in that use multi-fiber aramid or glass yarn.

5. The method according to any of paragraphs. 1-4, characterized in that the water-soluble precursor overabsorbed material used is derived from polyacrylic acid or a derivative of a copolymer of acrylamide and acrylic acid.

6. The method according to any of paragraphs. 1-5, characterized in that the receive thread containing 0.3-10 wt. % overabsorbed material.

 

Same patents:

FIELD: chemistry; production methods of composition for thread coating.

SUBSTANCE: composition includes x) = 10-50 mass.% of polyethylene wax with melting temperature from 110 to 150°C, y) = 10-50 mass.% compound ether compositions of conjoint polymer produced from α-olefine containing from 10 to 24 carbon atoms and unsaturated dicarboxylic acid selected from maleinic acid, fumaric acid, itaconic acid and citraconic acid z) = 100-(x+y) mass.% of silicon oil composition with 100 to 100- MPa-c viscosity at 20°C. Threads, fibres or filaments produced by spinning, stretching and texturing, if necessary, are subject to treatment with the specified composition.

EFFECT: items are ensured with high resistance property.

17 cl, 2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: proposed method of producing a water and oil repellent agent involves emulsification of (a) 15-85 wt % perfluoroalkylethylacrylate, (b1) 5-65 wt % 2-ethylhexylmethacrylate and (b2) 1-40 wt % benzyl methacrylate in the presence of (c) a cation surface active substance of the polyethylene oxide adduct type, or neutralised organic acid compound of an amine, with polyethylene oxide chains, and (d) compounds based on polypropylene glycol, with molecular weight 300-3000, or hexylene glycol, with subsequent copolymerisation reaction in the presence of a polymerisation initiator, and mixing the obtained aqueous dispersion with (e) blocked isocyanate.

EFFECT: satisfactory water and oil repellent for synthetic and natural fibre.

5 cl, 22 ex, 5 tbl

FIELD: textile, paper.

SUBSTANCE: invention relates to a woven or jersey material of the air bag with coating, produced without the dressing stage and without the washing stage from threads, which contain a certain amount of lubricant compound on their surface. Invention also relates to use of these threads in area of coated woven or jersey materials of air bags, and also to usage of an air bag comprising a woven or jersey material with coating.

EFFECT: improved operational properties of material.

20 cl, 2 ex

FIELD: textile, paper.

SUBSTANCE: textile fabric joined with a binding system comprises the following, wt %, dry weight: 10-90 water dispersion of polymerizates on the basis of conjugated aliphatic dienes and vinyl aromatic compounds, 10-90 starch, 0-10 additives, where the fabric is a nonwoven material.

EFFECT: invention makes it possible to improve the ability of fabrics to preserve dimensions under high temperatures with preservation of flexibility, ageing and stability properties.

26 cl, 1 tbl

FIELD: textiles, paper.

SUBSTANCE: emulsion of superabsorbent of water-in-oil type is applied to the yarn. Oil is a continuous oil phase and contains saturated hydrocarbons. And at least 70 wt % hydrocarbons contain 20 to 32 carbon atoms.

EFFECT: invention provides for the prevention or reduction of sedimentation of superabsorbent or oil on the guide rollers in the process of applying superabsorbent emulsion of water-in-oil type to the yarn.

6 cl, 1 tbl

FIELD: textiles, paper.

SUBSTANCE: contacting of textile with polymers A and B in aquatic medium is carried out. The polymer A is selected from the class of homopolymers or copolymers of vinyl alcohol, alkylene glycol, saccharides and carboxylic acid. The polymer B is selected from the class of homopolymers or copolymers of vinylpyrrolidone, alkylene oxide, saccharides and carboxylic acid. Polymers A and B refer to different classes. The aquatic medium contains an electrolyte selected from sodium, potassium, magnesium or calcium chlorides, sulfates or nitrates, and pH of the aquatic medium is less than 6.

EFFECT: reduction of textile contamination, improving the efficiency of subsequent processing.

8 cl, 8 tbl

FIELD: nanotechnology.

SUBSTANCE: invention relates to endow fibrous material hydrophobic and/or water-repellent properties. Comprises soaking of fibrous material suspension containing nano particles of hydrophobic material and cyanoacrylate in organic solvent, removing solvent, cross-linking of said cyanoacrylate.

EFFECT: such amount cyanoacrylate and such its weight ratio to nano particles for complete or partial coating of fibrous material matrix cross-linked cyanoacrylate, in which dispersed said nano particles.

12 cl, 7 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: method for carbon fiber fabric production is described, wherein the carbon fiber fabric (1) is impregnated with silicone, polyurethane or acrylic emulsion (4), which is then dried together with the fabric (1), wherein at least one protective layer (2 ) containing a film, woven or nonwoven material, is applied to one side of the fabric (1). Carbon fiber fabric (1) and lining for cars are also described.

EFFECT: carbon fiber fabric with improved properties is obtained.

20 cl, 4 dwg

FIELD: textile industry.

SUBSTANCE: method includes stage of article washing with detergent solution, which contains organic polymer, having spinnability, with average molecular weight of 1500000 or more, and where 60 mol % or more of its component monomers contain sulfonic acid group, or form of its salt, or sulfuric acid group, or form of its salt, provided that polyethylene oxide is unavailable. Invention also describes the following: method of hand washing, including stage of hand washing of laundry item with specified detergent solution, or washing solution produced by dissolution of detergent solution with more than 1-1000-multiple amount of water; and versions of detergents. Suggested washing solution may be used for hand washing.

EFFECT: improved smoothness of articles in process of washing and hand care, reduced unfavorable factors of squeaking, rough texture and physical fatigue in process of hand washing.

19 cl, 2 tbl, 11 ex

FIELD: textiles, paper.

SUBSTANCE: emulsion of superabsorbent of water-in-oil type is applied to the yarn. Oil is a continuous oil phase and contains saturated hydrocarbons. And at least 70 wt % hydrocarbons contain 20 to 32 carbon atoms.

EFFECT: invention provides for the prevention or reduction of sedimentation of superabsorbent or oil on the guide rollers in the process of applying superabsorbent emulsion of water-in-oil type to the yarn.

6 cl, 1 tbl

FIELD: textiles, paper.

SUBSTANCE: invention relates to the use of particles consisting of a core and a shell for coating the thread or textile material with them, to restrain or prevent wicking of water into the said thread or textile material. The particles are described, consisting of a core and a shell, for restraining or preventing the wicking of water into the thread or textile material, where the said particles have an average diameter of 10-300 nm and a mean-square deviation σ which is at least 10% of the average value, in which the shell of the particle consisting of a core and a shell comprises a copolymer of a vinyl aromatic monomer and a maleimide monomer with a glass transition temperature Tg of from 120 to 220°C. Also the thread or the textile material is described, containing aramid threads provided with a finish preparation containing diglyceride or triglyceride obtained from glycerol which is esterified with saturated or unsaturated fatty acids containing 6-20 carbon atoms, where the finished thread or textile material is provided with the above mentioned particles.

EFFECT: prevention of wicking of water in the textile material.

12 cl, 1 tbl, 2 ex

Up!