Amorphous poly(m-phenyleneterephthalamide) fiber having antistatic properties, its production method and composition for antistatic finishing of this fiber

 

(57) Abstract:

Describes amorphous poly(m-phenyleneterephthalamide) fiber having antistatic properties, containing from 5 to 15 wt.% anionic or cationic surfactants and having on the surface a coating of two components. The invention lies in the fact that one component of the coating is alkylphosphate potassium containing6-C18-alkyl, in an amount of from 65 to 90 wt.%, and another component of the coating is partially aminirovanie polyalkylene in the range from 10 to 3 wt.%, and partly aminirovanie polyalkylene has a residual amine number of from 200 to 800, and the coating is present in an amount of not less than about 0.5% by weight of the fiber. The combination of alkylphosphate potassium containing alkyl of 10 to 18 C atoms, and partially liderando polyalkylimide reduces the tendency is almost amorphous polietilentereftalatnogo fiber containing surfactant, accumulate static electricity. 3 S. and 1 C.p. f-crystals, 4 PL.

Art

In U.S. patent 4668234 describes the production of practically oriented amorphous poly(m-phenyleneterephthalamide) fibers containing the of Oki tone. These fibers often have an open structure, facilitating the penetration of the dye into the fiber. This fiber is desirable for the application of conventional antistatic coatings, as the fiber over time and loses its protective effect against static electricity. It causes damage to the fibers in the process of scratching and pulling in the processing of staple fibers into yarn and fabric. Loss of the protective effect after a month or two months of storage makes it difficult or impossible time control of inventory and transportation to supply fiber, capable of processing without the occurrence of undesirable static electricity.

In the author's evidence 1654397, A1, class D 01 6/74, 1991 described the use alkylphosphate surface-active substances for the treatment of poly(m-phenyleneterephthalamide) fibers in order to give them brightness. However, the concentration of surfactant in the fibers, as described in this author's evidence, too small to get a fiber capable of staining.

The present invention aims to overcome to a considerable extent, these shortcomings.

The invention

The present invention allows to obtain containing over the TEW accumulate static electricity and having on the surface a coating of two components, containing from 65 to 90 wt.% potassium salt of alkylphosphate containing alkyl 16-18 C atoms, and from 10 to 35 wt.% partially liderando polyalkylimide. This coating contained on the fiber in an amount of not less than 0.2% by weight of the fiber.

Detailed description of the invention

Threads that handle according to the present invention, is described in U.S. patent N 4668234. In particular, they represent fibers of poly(m-phenylenedimaleimide) MPD-1, dried after application of 5 to 15 wt. % anionic surfactants, isopropylbenzenesulfonyl as described in example 1, part C of the upper column 8 of the patent.

On the dried fiber MPD-1, described above, are coated with two active components. One component is partially aminirovanie polyalkylene with residual amine number of from 200 to 800, described in U.S. patent 3597265. It is produced by the interaction polyalkylimide with a molecular weight of from 800 to 5000 with fatty acid. In the following examples polyalkyleneglycol with an average molecular weight of 1200 is polyalkylene, partially aminirovanie fatty acid according to examples 1-4 above mentioned U.S. patent 3597265. Other active co is the alkyl 6-18 atoms C. Preferably, n-octylphosphine potassium.

Both active components, namely partially aminirovanie polyalkylene and salts of phosphate, can be applied to the fiber at the same time in the form of an aqueous mixture or sequentially: first Imin, and then phosphate (with intermediate drying).

The resulting coating should contain from 65 to 90 wt.% salt of phosphate and from 10-35 wt.% partially liderando polyalkylimide. An aqueous solution of the components is applied to the fiber in a quantity sufficient for the application of not less than 0.2 %and preferably not less than 0.4 wt.% active ingredients by weight of the fiber. Can be used to 0.9% of the mixture, but usually use the minimum effective amount for reasons of economy and to avoid contamination of equipment during use of excessive amounts. It is important to dry the fiber immediately after applying the antistatic coating, because the protective effect is reduced in the case of drying the fiber at ambient temperature.

Especially preferred is the application of active components on the fiber in the mixture. When using partially liderando polyethylenimine in combination with n-existspath potassium or n-octylphosphine to="ptx2">

The following examples except the control illustrate the invention without limiting it.

Example 1

In transparent glass mixing vessel add sequentially 80,18 wt.h. demineralized water, 16,07 wt. including a 70% aqueous solution of n-octylphosphine potassium and 3.75 wt. including partially liderando polyethylenimine obtained according to examples 1-4 of U.S. patent 3597265 (amine number 340-420). The mixture is heated to 35-40oC and stirred for 15 min to obtain a clear 15%-aqueous solution. The solution has a pH 10,23.

Example 2 (control)

In transparent mixing vessel successively added 85 including demineralized water and 15 wt. including partially liderando polyethylenimine similar to example 1. After stirring for about 15 min to get a clear solution. The solution is then diluted with demineralized water to a concentration of 0.25 wt.%.

Example 3 (control)

In transparent mixing vessel successively added 80 wt. including demineralized water and 20 wt. including 75% solution of laurifolia potassium. The mixture is stirred for 15 min until a homogeneous opaque molokoobraznuyu 15% of the emulsion. An aliquot of this emulsion is then >In transparent mixing vessel add sequentially 78,6 wt.h. demineralized water and 21.4 wt.h. a 70% aqueous solution of n-octylphosphine potassium. The mixture is stirred for 15 min until a homogeneous molokoobraznuyu opaque 15% of the variance. Aliquots of this dispersion is then diluted to 0.75% and 1.0% concentration demineralized water.

Example 5 (control)

In transparent mixing vessel add sequentially to 66.7 wt.h. demineralized water and 33 wt.h. 45% aqueous solution of n-hexylphosphonic potassium. The mixture is stirred for about 15 min until a clear solution is formed. Aliquots of this solution is then diluted with demineralized water to a concentration of 0.75% and 1.0%.

Example 6

The coating solution obtained in example 1, diluted to 1% concentration demineralized water, and 5 g of this solution added to a beaker containing 5 g of aramid staple fibers (Type E-34 Nomex) of 1.5 denier, 1 1/2 inch, obtained in accordance with U.S. patent N 4668234. Staple fiber and the coating solution is stirred with a glass rod for about 5 min to distribute the solution of the coating on the fibers. Immediately after study is 7 (control)

The emulsion coating prepared according to example 5, applied to aramid staple fiber as in example 6.

Example 8 (control)

Dispersion coating prepared according to example 4, applied to aramid staple fiber as in example 6.

Example 9 (control)

The coating solution obtained in example 5, applied to aramid staple fiber as in example 6.

Example 10

The coating solution according to example 2 is applied to aramid staple fiber by adding 5 g of a 0.25% aqueous solution of the coating to 5 g aramid staple fiber in a laboratory glass, stirring for 5 minutes and drying immediately after mixing for 10 minutes at 130oC. Then it is a staple fiber is placed in a Cup, add 5 g 0,75% emulsion coating according to example 3 is stirred for 5 min and dried at 130oC for 10 minutes

Example 11

Treat the fiber as in example 10 using a 0.25% aqueous solution of the coating according to example 2 and 0.75% dispersion coating according to example 4.

Example 12

Treat the fiber as in example 10 using a 0.25% aqueous solution of the coating according to example 2 and 0.75% RASTAM 6-14, processed into rovings short length through the Rotor Ring Model 580, manufacturer Spinlab. The electrical resistance of the samples is determined by the method described in the literature (Thomas J. Proffitt, Jr. "Surfactants as Textile Antistatic Agents", Proceedings of Session Lectures and Scientific Presentations on ISF-JOCS World Congress, vol. 11, p. 699, The Japan Oil Chemists Society, Tokyo). The results are presented in table 2 in the form of resistance, expressed as the index of log R. the Resistance log R measured at 47% relative humidity and repeat the measurement after keeping the samples.

Example 14

The coating solution prepared by the method of example 1, applied to type 2 bundles of fibers with a thickness of 1.5 denier of MPD-1, i.e. harness, capable of staining without carrier fibers of aromatic polyamide NomexE-34 and harness, capable of printing without carrier fibers of aromatic polyamide Nomextype E-504 by passing strings in contact with the surfaces of the two applicators Baber (see U.S. patent N 3422796), which are located one above and the other below the bar wiring harness. Samples harnesses received when using the three velocities of flow of the coating solution for each of the resulting bundle.

Then the sample is placed in the capacity to tow and immediately (~20 m with obtaining a staple length of 1 1/2 inch by Lummus cutter. The staple is directed to the carding machine of the cotton type with hopper feeder and receiver roller type. The level of electrostatic charging of the fibers was acceptable when the content of the coating on the fiber 0.2 wt.% by weight of the fiber and higher, and thus the cohesion of the fibers are improved. Content of the coating on the fiber over time, very little has changed, as shown in table 3, as well as electrostatic charge and the indicator log R, as shown in table 4. Cohesion determined by the tensile strength of wool ribbon in mg/denier, was changed from 2.46 to 3,84 the fiber-containing coating according to example 1, and Vice versa from 1,43 up to 1.83 for fibers containing a control coating of laurifolia potassium. The result is improved stability Cardin tape.

1. Amorphous poly(m-phenyleneterephthalamide) fiber having antistatic properties, containing from 5 to 15 wt.% anionic or cationic surfactants and having on the surface a coating of two components, wherein one component of the coating is alkylphosphate potassium containing alkyl of 6 to 18 C atoms, in an amount of from 65 to 90 wt.% and another component of the coating is partially aminirovanie the e amine number of from 200 to 800 and the coating is present in an amount of not less than about 0.2% by weight of the fiber.

2. Fiber under item 1, characterized in that as alkylphosphate potassium it contains n-octylphosphine potassium.

3. The method of obtaining fiber under item 1, by coating on the fiber coating, characterized in that the fiber is applied powder coating in the form of a mixture of both components or sequentially with intermediate drying after the application of each component.

4. The composition for antistatic finish is able to be painted and containing surfactant poly(m-phenyleneterephthalamide) fibers, characterized in that it comprises an aqueous solution of n-hexylphosphonic potassium or n-octylphosphine potassium and partially aminirovanie polyalkylene at a ratio of from 65 to 90 wt.% phosphate and from 10 to 35 wt.% polyalkylimide, and partly aminirovanie polyalkylene has a residual amine number of from 200 to 800 and the surfactant is anionic or cationic surface-active agent is present in the fiber in an amount of 5 to 15 wt.%.

 

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1 tbl, 7 ex

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