DE2430955A1 - SPINNED NON-WOVEN FABRIC - Google Patents

Description

PATENT APPLICATION

DR. ! .MAAS

DR. G. SPOTT

8000 MONKS 40

SCHLEiSSHEIMEHSTR. 299

TEL. 3 59 22 Ot / 2 05

DC 1948

Dow Corning Corporation, Midland, Michigan, V.St.A.

Spunbond non-woven fabric

The invention relates to spunbond nonwoven fabrics.

A spunbond fabric is a continuous filament nonwoven material made by Combination of the entire stages from polymer to finished Tissue in a single process. String curtains are extruded, drawn, guided on a belt and then combined to form a web with the required dimensions. the The web is then bound and can be finished in the same one-step process.

The basic process steps for the production of spunbond nonwoven materials are pretty straightforward. Multiple spinnerets extrude large numbers of filaments that be pulled and oriented in groups by means of rollers or air at high speed and then in a certain desired manner geometric arrangement can be placed on a slower moving porous belt on which the threads pass a suction can be held. The conveyor belt then brings the web to a binding device (heated rollers,

a device for applying binding agent, etc.) and finally to a number of further processing stages of the Procedure. The final stages of the process can be the traditional textile finishing stages such as Printing or embossing if the process speeds are correspondingly favorable. Following this will the fabric checked, wound and packaged.

A variety of spunbond nonwoven materials are available commercially. Examples of such materials are those based on polyester, polypropylene, polyethylene, nylon, or combinations thereof. The. respectively The particular type of fiber used will depend on the type of finished product one is trying to make. Spunbond nonwoven Materials are used, for example, as book covers, clothing material or carpet undersides.

The invention now relates to a spunbond nonwoven fabric Fabric on which a silicone-glycol copolymer is deposited general formula

(CH ₃ ) ₃ SiOj (CH ₃ ) ₂ Sio { _χ j (CH ₃ ) GSioJ _y Si (CH ₃ ) ₃

where G is a radical of the structure R (OC-H,) OH

j O Z

R is alkylene with 1 to 18 carbon atoms, χ · has an average of 40 to 90, y for an average is from 1 to 10 and ζ is an average of 1 to 10.

The invention also relates to a polyolefin spunbond nonwoven fabric having a silicone-glycol copolymer thereon of the general formula given above.

The invention also relates to a spunbond nonwoven polypropylene carpet underside on which a Silicone-glycol copolymer of the general formula given above.

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One of the most important economic uses One of a spunbond nonwoven material is the use of spunbond nonwoven polypropylene as the underside of the carpet. The polypropylene spunbond nonwoven materials have the jute woven materials replaces that were previously used for the manufacture of carpet undersides. With this procedure, the Carpet yarn tied with a large needle that the spunbond punctures nonwoven polypropylene fabric, which is predominantly to form the underside of a carpet. A loop device catches the thread on the underside and forms loops or tufts, and the needle is then withdrawn. The fabric backing is then moved further and the whole process is repeated to form more tufts. the Tufts form the hair cover or top of the finished Carpet. A commercially available tufting machine can have up to 2400 needles in a row, all of which are in the same direction work, for example, to make a 4.5 m wide carpet. The main "base that the spunbond is non-woven polypropylene, is the structural basis of the carpet. It holds the pile in place and gives it that Carpet dimensional stability and strength. On the underside of the piled spunbond nonwoven Polypropylene becomes a coating made of glue or latex applied, for example from natural rubber or styrene butadiene rubber, and this coating anchors the tufts or the pile firmly in place and protects it from one Pull out. A jute or foam underlay can then be applied to the carpet as a cushion or pillow acts. In developing this application of the spunbond nonwoven fabric, we showed that the Needles damage the underside of the carpet quite severely when penetrating the structure, which is the case with the pile formation process leads to a strong loss of strength. It was then found that by treating the spunbond nonwoven Polypropylene carpet base with a methyl hydrogen polysiloxane liquid penetration of the needle through

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facilitate the underside of the carpet during pile formation and the destruction of fibers and the resulting loss of strength can be greatly reduced. However, when using the methyl hydrogen polysiloxane fluid, one occurred Series of difficulties. The most serious difficulties arose during the dyeing of the carpet in use the spunbond nonwoven polypropylene carpet base. With the continuous dyeing process according to Küster (namely, a foam dyeing process with steam) for carpets was caused by the methylhydrogen polysiloxane liquid the bottom of the carpet reduces the foam height in the system, resulting in non-uniform coloring of the carpet. Other Problems arose from the reduced wettability of the carpet, the inclination of the carpet in aqueous systems to drift or swim, the relatively easy flammability of the carpet and the high cost of the methyl water used toffpolysiloxane fluid.

According to the invention it has now been found that by using of the silicone-glycol copolymer of the general formula given above in place of the methyl hydrogen polysiloxane fluid previously used not only receives good lubrication, which is what the needle penetrates through the underside of the carpet The pile formation process is facilitated, but that at the same time those occurring in the Küster process Difficulties in dyeing the carpet can be greatly reduced or even avoided entirely.

As can be seen from the above general formula, the silicone-glycol copolymer is that the results of the invention and benefits, a trimethylsilyl endblocked siloxane that has 40 to 90 dimethylsiloxane units and 1 to 10 methylglycolsiloxane units contains. The copolymers suitable according to the invention are insoluble in water. The water-soluble silicone-glycol copolymers wet the latex underside of the carpet too much, making the polypropylene underlay too strong is penetrated, resulting in poor carpet quality.

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_ K mm

The glycol units are indicated in the general formula by the symbol G, which more precisely _{corresponds to the structure of the formula -R (OC 3} H,.) OH. The substituent R in this structure can be any alkyl moiety having 1 to 18 carbon atoms. R can therefore stand for methylene, ethylene, propylene, butylene, isobutylene, hexylene, decylene, dodecylene or octadecylene. The glycol fraction of the structure represented by the formula (OC ₃ Hg) corresponds, as can be seen, to the formula of a propylene glycol. This glycol is a hydroxyl endblocked or, as those skilled in the art normally say, an unblocked glycol. As already mentioned, the glycol component of the structure can consist of 1 to 10 propylene oxide units on average, ie the symbol ζ has an average value of 1 to 10. The symbol ζ should preferably have an average value of 1 to 5.

The methylglycolsiloxane units in the silicone-glycol copolymer can range from an average of 1 to 10, indicating that the symbol y has an average of 1 to 10 can mean. In general, however, the mean value of the symbol y should be 1 to 5. The index χ can be used for have an average value of 40 to 90, .vorvors means however, it has a mean value of 50 to 75. The index χ gives the number of dimethylsiloxane units in the silicone " Glycol copolymer.

Because of the structural features given above, those skilled in the art familiar with the manufacture of such materials are readily available able to use the silicone glycol copolymer given above to manufacture.

The silicone-glycol copolymer can be converted in any manner known in the finishing of fabrics or textiles Apply the spunbond nonwoven materials Use of an engraved roller is preferred for this at the moment. The amount applied to the fabric depends on to a certain extent on the desired results,

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however, it is generally between 0.1 and 10 percent by weight, based on the total weight of the fabric. However, an amount of 0.5 to 5 percent by weight will generally meet most needs. The silicone glycol copolymer can be applied to the fabric as such or in the form of a solution in a suitable carrier such as water (emulsified), lower alcohols, ethers, ketones or other applied _f compatible with water solvents.

The invention is illustrated in more detail by means of the following examples. All parts and percentages relate to weight data, and all viscosities are ^{measured at 25 °} C., unless stated otherwise.

Example 1 A silicone-glycol copolymer of the general formula

(CH ₃ ) ₃ Si0 j (CH ₃ ) ₂ Sioj ^ ₆₇ J (CH ₃ ) SioJ ^ ₃ Si (CH ₃ ) ₃

(CH ₂ ) ₃ (OC ₃ H ₆ ) _ _2f5 OH

is applied to a polypropylene spunbond nonwoven carpet underside using a gravure roller. The uptake is around 1% of silicone-glycol copolymer, based on the weight of the underside of the carpet. A piece of a carpet provided with tufts or a pile is then made from the treated underside. It was found that the silicone-glycol copolymer according to the invention The lubrication of the needles achieved in the pile formation process corresponded to that obtained with the currently used methylhydrogen polysiloxane fluid in the same intake, namely an intake of 1%, received.

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The carpet made above comes with a latex rubber base Mistake. The latex penetrates about 35% of the strength of the spunbond nonwoven polypropylene, and when treated mit der.Methylwasserstoffpolysiloxanlösung is the penetration of latex through the spunbond nonwoven Polypropylene about 30%. Both penetration values remain within an acceptable range.

Example -2

The silicone-glycol copolymer used according to Example 1 is applied to a spunbond non-woven polypropylene carpet underside by means of an engraved roller in such a way that an uptake of 4% is obtained. From the base treated in this way a carpet is made with tufts or with a pile, after which the whole thing is allowed to age for 7 weeks before one dyed according to the Küster method. In the dyeing process, foam formation occurs after 5 seconds, the one height of 5, O8 cm, has a lifespan of 120 seconds and quality is very good. So there are no problems when dyeing this carpet.

For comparison, the polypropylene spunbond nonwoven carpet bottom with a methyl hydrogen polysiloxane liquid applied by means of an engraving roller an uptake of 3% and subsequent pile formation of the carpet cannot be dyed according to the Küster method, since no foam formed from the presence of this siloxane. This trial was carried out after 1 week of cleaning the carpet aging ran ;.

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Note that there is more silicone-glycol copolymer in the present invention is added, so that, as expected, the antifoam effect should have been even bigger. It should also be mentioned that the sample according to the invention was aged longer than that spunbond non-woven polypropylene carpet underside, which should actually lead to difficulties in dyeing.

Example 3

Will be the silicone-glycol copolymers used in the above examples replaced by the copolymers mentioned below, the result is a spunbond, non-woven polypropylene carpet underside, through which the needles are excellently lubricated during the formation of the pile, and which then move without considerable Defoaming can be colored by the Küster process.

(A) (CH ₃ ) ₃ SiO J (CH ₃ ) ₂ SioJ _4Q j (CH ₃ ) SiOJ ₁ Si (CH ₃ )

(B) (CH ₃ ) ₃ Si0j (CH ₃ ) ₂ Sioj _5o I (CH ₃ ) SiOJ ₃ Si (CH ₃ )

(CH ₂ ) ₃ (OC ₃ Hg) ₃ OH

(C) (CH ₃ ) ₃ SiOj (CH ₃ ) ₂ SioJ ₇₅ j (CH ₃ ) SiOJ ₅ Si (CH ₃ ) ₃

(CH ₂ J ₃ (OC ₃ Hg) ₅ OH

(D) (CH ₃ ) ₃ SiOj (CH ₃ ) ₂ SiOJ ₉₀ j (CH ₃ ) Sioj _1Q Si (CH ₃ ) ₃

(CH ₂ ) ₃

(E) (CH ₃ ) ₃ Si0 j (CH ₃ ) ₂ Si0J ₆₅ j (CH ₃ ) Sioj ₄ Si (CH ₃ )

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. Be i s ρ i e 1 4

Takes place on a spunbond nonwoven polyester fabric, or, a spunbond polyethylene material 2% of a silicone-glycol copolymer: of the general formula

(CH ₃ ) ₃ SiO j (CH ₃ ) ₂ SioJ ₇₀ j (CH ₃ ) SiOJ _? Si (CH ₃ ) ₃

then you get an excellent surface finish,

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Claims (3)

Claims 1. Spunbond non-woven fabric, characterized in that that there is a silicone-glycol copolymer of the general formula on it (CH ₃ ) ₃ SiOj (CH ₃ ) ₂ SiöJ _x j (CH ₃ ) GSiOJySi (CH ₃ ) ₃ is where G stands for a radical of the structure R (OC ₅ H,) OH, j ο Ζ R is alkylene with 1 to 18 carbon atoms, χ stands for an average value from 40 to 90, y has a mean value from 1 to 10 and ζ means an average value of 1 to 10. 2. Fabric according to claim 1, characterized in that the substituent R contains 3 to 6 carbon atoms, χ has an average value of 50 to 75, y has an average value of 1 to 5 and ζ means a mean value of 1 to 5. 3. Fabric according to claim 2, characterized in that the substituent R contains 3 carbon atoms, χ an average value of about 67, y represents an average of about 3, and ζ represents an average of about 2.5. 509809/1133