Method for preventing formation of sediments on guide rollers

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

 

This invention relates to a method of preventing or reducing sediment superabsorbent substances (hereinafter superabsorbent) and/or oil on the guide rollers in the process of applying emulsion superabsorbent type water-in-oil on the yarn, in which the oil is a mixture containing saturated aliphatic hydrocarbons.

Application superabsorbent substances are described in EP 779389 for aramid yarn and EP 0784116 for other types of filament yarn. Described in these documents, the method comprises applying to the surface of the yarn layer of the emulsion water-in-oil in an aqueous phase which contains superabsorbent. This method proved to be the best for commercial production superabsorbent yarn. However, the disadvantage of this method is the high cost associated with the fact that the emulsion water-in-oil contains large quantities of water, usually from 25 to 40 wt.%, that requires drying after application of superabsorbent. Attempts to use other emulsion containing much smaller amounts of water were unsuccessful due to the inability of the controlled application of these emulsions on the yarn and/or due to the fact that the guide rollers, which are used to give the yarn a certain direction in the manufacturing process, quickly filled with sediments, which resulted in the need to stop the PR is the process and clean the rollers.

According to another method of applying superabsorbents, are described in WO 9910591, an aqueous solution of water-soluble precursor of superabsorbent was applied to the yarn, followed by drying and heating the yarn to cause the linking or polymerization of water-soluble precursor of superabsorbent and getting covered in superabsorbent yarn. This method also had the flaw, which was in the stage of drying after applying superabsorbent; moreover, to ensure stitching superabsorbent required stage heating. In WO 00/31752 described yarn, covered with a water-blocking substance that contains practically free from water dispersion, representing superabsorbent polymer and the dispersion medium. In this way the emulsion water-in-oil not used, but superabsorbent dispersed in oil. As oils are not saturated hydrocarbons and ester lubricating oils, consisting of an alcohol and a carboxylic acid in which the number of carbon atoms in the General case less than 20. The development of this method has simplified the coating on the yarn as compared with a water-blocking substances on the basis of emulsions of water-in-oil. However, this method is unfavorable because of the low stability of these dispersions and health risks to workers through inhalation of small particles superabsorbent is and in the sediment, formed on the guide rollers, etc.

Therefore, the purpose of this invention is the method of application superabsorbent on the yarn, eliminating the need for additional stages after application of superabsorbent on the yarn and the sediment or at least severely limiting precipitate formation on the guide rollers or other parts of the production line.

The term "pulley" in the sense as it is used herein, includes guide rollers, pinch rollers, tube rollers, guide rods, pins, winders, etc.

Thus, this invention relates to a method of preventing or reducing the formation of deposits of superabsorbent and/or oil on the guide rollers in the process of applying emulsion superabsorbent type water-in-oil on yarn, where the oil is a mixture containing saturated aliphatic hydrocarbons, and wherein at least 70 wt.% hydrocarbons contain from 20 to 32 carbon atoms. It is preferable to use the oil in which at least 75 wt.% hydrocarbons contain from 20 to 32 carbon atoms, and most preferred oils contain at least 79 wt.% these hydrocarbons.

The method according to this invention allows to apply the specified emulsion water-in-oil on yarn is directly online. Thus, the forming of the yarn can be processed directly such emulsion water-in-oil without the prior winding on a bobbin. There is no need for drying or heating the yarn after applying emulsion, superabsorbent granules, and at the end of the process the yarn is wound on a bobbin. The yarn can be fully or partially dry before applying the emulsion water-in-oil. The term "online" means that the yarn used in this form, as it was formed, without winding on a bobbin, spool, bobbin or the like, Further, this method allows to perform the process at high speeds. The speed of the yarn should be at least 220 m/min, but also allowed a much higher speed, such as 600 m/min

This method is suitable for any complex threads, but is particularly suitable for aramid yarn, stekloprjazhi.

The superabsorbents are described in EP 779389. These substances have hydrophilic properties and is able to absorb and retain a relatively large amount of water, perhaps under pressure. So, in addition to insoluble superabsorbents mentioned on page 198 of the book "Absorption capacity", edited by P. K. Chatterjee, released in 1985, the publishing house Elsevier, Amsterdam (Absorbency, Ed. by P. K. Chatterjee, Elsevier, Amsterdam, 1985), and also referred to in the application for Europatent No. 0351100, substances that are intended to be applied is about this invention, include completely or partially soluble in water superabsorbent substances. Although aramid yarn according to this invention can be applied to any substance having the properties of superabsorbent, preference is given to those superabsorbents, which can be turned into stable emulsions water-in-oil. Particularly suitable superabsorbent derivatives of polyacrylic acid. These include homopolymers and copolymers, derivatives of acrylamide, derivatives of acrylamide and sodium acrylate, and derivatives of acrylamide and dialkylaminoalkyl. Accordingly, these compounds are selected from the group of nonionic, anionic and cationic (co)polymers. In General, they receive the linking of monomer units in the water-soluble polymer. This polymer can then be converted into insoluble due to the introduction of ionic and/or covalent cross-links. Examples of superabsorbents, suitable for use in the manufacture of yarn according to this invention include crosslinked polyacrylic acid, partially neutralized sodium salt; sodium polyacrylate; copolymers of sodium acrylate and acrylamide; terpolymer of acrylamide with monomers containing carboxyl groups, sulfo group (sodium salt); and copolymers of polyacrylamide.

Preference is given to using terpolymer of acrylamide with monomial is AMI, containing carboxyl groups, sulfo group (sodium salt), or copolymers of acrylamide and acrylic acid, or their sodium or potassium salt. For manufacturing yarn according to this invention using the method, which involves coating the surface of the aramid yarn layer emulsion water-in-oil in an aqueous phase which contains a substance having the properties of superabsorbent, and which does not require further processing by drying. Superabsorbent granules emulsion water-in-oil is not changed after it was applied to the yarn. When this emulsion is in contact with water, it turns into an emulsion, oil-in-water, thereby forming a highly viscous gel. This gel prevents the penetration of water into the damaged yarn or cord.

This emulsion was prepared as follows: using the emulsifier is a water-soluble monomer, which mixed with some water, dispersed in non-polar solvent which is not miscible with water and the specified monomer, and then polimerizuet obtaining emulsion water-in-oil. The resulting polymer is in the aqueous phase of the emulsion. The water content of the emulsion can be reduced by vacuum treatment of the finished emulsion. In this way we obtain a liquid product containing a highly concentrated superabsorbent, whereas the viscosity of the liquid is stetsa low, and the amount of volatile components in the emulsion can be reduced. As the continuous oil phase of the emulsion can be used with linear and branched hydrocarbons, which do not blend or mix poorly with water. It is preferable to use linear and branched aliphatic hydrocarbons. The hydrocarbons may consist of molecules which contain from 20 to 32 carbon atoms. Hydrocarbon molecules of smaller size may be present in an amount up to 30 wt.%, preferably less than 20 wt.%. The best results are mixtures which contain as little as possible of the hydrocarbons with the number of carbon atoms, less 20; more preferred mixtures containing as little as possible of hydrocarbons, in which the number of carbon atoms is less than 23. Hydrocarbons, which mostly contain from 20 to 32 carbon atoms, may represent a purely branched or unbranched hydrocarbons, but usually it is a mixture of branched and unbranched hydrocarbons of various lengths. Suitable hydrocarbons are commercially available under various trademarks such producers, as Schell Lubricants (Shell Lubricants), INEOS (Ineos), Dow (Dow), Exxon mobile (Exxon Mobile), Chevron Phillips (Chevron Phillips), Total (Total), British petrol (British Petrol) and Lublin (LubLine). These hydrocarbons can also be used as diluents for SN the supply viscosity emulsions water-in-oil. Examples of suitable branched and saturated hydrocarbon is isoeicosane from INEOS. Ready to use emulsion can be obtained from various manufacturers, such as Ashland (Ashland), Zetec (Cytec), Devotec (Defotec), Bozetto (Bozetto), Nalko (Nalco) and Other Chemical (Drew Chemical).

Used emulsifiers are chosen so that this mixture could be converted into an emulsion, water-in-oil. This means that the emulsifier must have products HLB value (hydrophilic-lipophilic balance) in the range of 3-12. The concentration of superabsorbent in the emulsion used according to this invention, comprises 1-90%, preferably 25-65%, calculated on the total weight of the emulsion.

In the emulsion can optionally enter other additives, such as lubricants, stabilizers, emulsifiers and/or diluents.

The yarn number of the emulsion water-in-oil superabsorbent granules, choose to obtain favorable water-blocking properties during operation of the yarn in the cables. Favorable results are usually obtained if the yarn contains the emulsion in the amount of 0.3-10 wt.%, preferably 0.5 to 8 wt.%, even more preferably 1.0 to 5.0 wt.% the weight of the emulsion.

According to the method of producing a yarn according to this invention for applying emulsion water-in-oil you can use the method which is in itself known, i.e. using the humidifier is on the platen, spray or dip coating.

The invention is illustrated in the following non-limiting example.

Example

Mass for molding aramid yarn was obtained by mixing frozen concentrated sulfuric acid (99,8%wt.) powder poly-p-phenyleneterephthalamide. Mass for molding was wearisomely, were heated to 85-90C in plasticators/mixer/rasplavil and served in the multi-die plate through the filter and forming the pump. Filer had 1000 holes, each with a diameter of 59 microns. Formulennou mass was pumped through the molding holes, and then passed sequentially through airside length of 6 mm and a coagulation bath containing a dilute aqueous solution of sulfuric acid (about 18 wt.%) at a temperature of 10C. Molded so a bunch of threads successively passed through a neutralizing bath containing a dilute sodium hydroxide solution, and the wash tub in which filaments were thoroughly washed with water at a temperature of about 70C. the Excess water was removed from the threads with a pair of wringer rollers. Further, not a bunch of threads was applied to 0.8% non-ionic molding cover (from 15 wt.% aqueous solution) using a spray gun and pump. Then the yarn was passed sequentially over the three drying drums (6 turns at 160C, 6 is Idov at 200C, 4 turns at 230C). The total time during which the yarn was in contact with the surface of the drums was 6-7 C. Then, the yarn was passed through the drum conveyor (4 turns at about 25C.). Immediately after the drum conveyor on the yarn caused emulsion water-in-oil superabsorbent granules (see table), using a spray gun and pump. Finally, the treated yarn rewinding on the package with a speed of 340 m/min thus Obtained yarn Twaronhad a linear density 1610 Tex.

The results are shown in the table.

340
Emulsion water-in-oil superabsorbent granules
This inventionTo compare
12AndB
Metered quantity of the yarn Twaron(%)3333
The rate of formation/movement yarn (m/min)340340340
The maximum duration of the production-tion cycle>19>21<2,5<0,5
Precipitate formation on the guide rollers and/or prijemnom videoThere is almost noThere is almost noStrongStrong
Wt.% linear and Rassvet-run aliphatic hydrocarbons C20-C32798181
Wt.% water in the emulsion332741

The table shows that the hydrocarbons, which are mainly hydrocarbons C0-C32) (isoeicosane from INEOS), do not form (or almost not formed) of precipitation on the guide rollers, allowing production cycles with a duration of more than 19 hours of Traditional hydrocarbon emulsions (examples a and B; respectively Gruvlok 2585 (Drewfloc) from Ashland Specialty Chemicalcompany (Ashland Specialty Chemical Company, Barendrecht, the Netherlands) and Esterson APV (Estersol AFW) from Bozetto (Bozetto GmbH, Krefeld, Germany), which contain low molecular weight hydrocarbons, form large precipitation on the guide rollers, which makes it impossible to carry out the production cycles lasting more than a few hours. To continue the process was required frequent cleaning. High molecular weight hydrocarbons according to this invention (examples 1 and 2) can be obtained with very low water content (attainable levels below 10 wt.%; preferably, less than 8 wt.%; most preferably below 5 wt.%). Thus, there is no need for drying after application of the emulsion.

1. The method of applying to the yarn emulsion superabsorbent type water-in-oil, which prevents or reduces the formation of sludge, where oil constitutes the continuous oil phase containing saturated hydrocarbons, wherein at least 70 wt.% hydrocarbons contain from 20 to 32 carbon atoms.

2. The method according to claim 1, wherein at least 75 wt.% hydrocarbons contain from 20 to 32 carbon atoms.

3. The method according to claim 1, characterized in that not less than 79 wt.% hydrocarbons contain from 20 to 32 carbon atoms.

4. The method according to any one of claims 1 to 3, characterized in that the method used in the online for yarn, which produces the t method of forming fibers.

5. The method according to claim 4, characterized in that the speed of the yarn is at least 220 m/min

6. The method according to claim 1, in which the yarn is an aramid yarn or stekloprjazhi.



 

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