DE1669436A1 - Composite thread made from two polymers that shrink to different degrees - Google Patents

Description

1CCQ / QC ^POS · ^GW

Composite thread made from two polymers that shrink at different rates

Glanzstoff AG WUPPERTAL

Composite threads in the context of the invention are mono- and multifilament threads understood, which is produced in a known manner by spinning two different spinning masses using special nozzles v / earth. Devices in such nozzles allow two polymer solutions or - to press melt out of a nozzle hole in such a way that core-sheath threads er * ts' .-. ^ ~ -.of the threads in which the two polymers one part each of the cc: iacan surface and the thread cross-section image.

Composite threads are of particular importance which, immediately after spinning and drawing, without special treatment or under the action of iron, steam or cjl. form a curl. Polymers with different physical and / or chemical properties, in particular those with different degrees of tendency to shrink, are used to produce such composite threads. Crinkling always occurs when both polymers form at least part of the surface or when an eccentric core-shell structure is formed.

üin got /. Oo process relates to the manufacture of composite yarn of two Poly.,.-Ene under strong rope Edlich shrinkability. Here

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Item GW

the more strongly shrinking thread component should have a shrinkage of at least 7 % and the difference in the shrinkability of the two components should be at least 10 %, preferably 20 #. Examples of useful polymer combinations include polyamides made from dicarboxylic acids and diamines or from caprolactam on the one hand and polyethylene terephthalate on the other. In addition, one of the thread components can also be a copolyamide or copolyester.

Composite thread made by the known method using various Polymer combinations are produced, show depending on the type and amount of the composition after a heat treatment more or less strong ripple. For example, a core-sheath thread with an eccentric configuration of core and sheath, the consists of polyamide and polyethylene terephthalate, after treatment with water at 95 °, a number of curled arcs of II5 per 10 cm Length of thread.

It has now been found that the composite thread of two different strengths shrinking polymers with an eccentric design of the core and cladding, much better Z -... shafts, especially with regard to of the number of crimped arcs when the sheath of these threads is made a homopolyamia and the core of a copolyether amide, which by Polycondensation of adipic acid with 75 to 20 mol ^, preferably 50 - 40 mol # ether diamine, co: - formula

- (c: -: ₂ ) j - R - (CH ₂ ) - NK ₂ ,

where R is the groups -0- or -0- (CHg) _n -O- and η can be 2-4, and 25 to 80 mol / 3, preferably 50-60 mol / 3, preferably 50-60 mol, hexamethylenediamine has been prepared.

The C weight fractions of the sheath and core of the composite thread according to the invention should be J> 0:70 to 70: JO, preferably 50:50.

The known homopolyamides are used as the sheath component of the composite thread

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Item GW 1331

suitable, for example from those from Caprolaetam, hexamethylenediamine and adipic acid, arainoundecanoic acid and others.

Preferred properties are exhibited by composite threads whose sheath is made from Polyhexamethylene adipamide or polycaprolactam and their core from the copolyether amide by polycondensation of · adipic acid with 40 mol # ether diamine of the formula

- 0 - (CH ₂ ) ₂ - 0 -

and 60 moles # hexamethylenediamine was made.

Copolyether amides of the composition mentioned are produced in accordance with the German patent specification (Application Aktz. G 47 579 IV d / 39 c). After the process described therein succeeds ·, ^r Copolyätheramide in Jed any ratio of Xtherdiamin: to produce hexamethylene diamine sufficiently high molecular weight and good thread-forming properties. * ese copolyetheramides have a surprisingly high shrinkage capacity.

Table I shows the shrinkage values of some copolyether amide and other Poly.v.erisatfäden Put together in water of 95 ° and 20 °.

Table I.

fa cen; nateriai Adipic acid and a c ta :. '. - \ "r ρ ^ - ^ -. · .-" »ι / -> t- - ·> - l-vn ^;
O ^ i? WC ^ * JJL Ks Jd K * L / C * ·>. IaX λ \ Λ 95 Shrinkage O cf. at O % Copoly ätherair.id £ .us and Ätherdiai .-. in ⁺ id from adipic acid rlexarr.ethylene -H exa.v.e thy I en c i a; .. i η 20th Kexa; .. e uhylendiarr.in 50 months> 60 50 KoIJS cO " ^ c auj SO: ·: 50 % 35 40 " 7C " ■ 'AGio "* rsäu ^ c 38 20th 30 " 11th 14th , 2 Pclya.7. ic from Caprol 6th ? cly ~:;: 7- , 4 ci-sr.in 5 Ccpo ^ y 35-4 ,8th 2C y.ol. G

· ■: -. ■ -; - ,, .. .- ^ in the formula H ^ X - (CiI ^ i, - C - (CH ^) ₀ - 0 - (CH ,,), - NH,

The table shows that the very stump power of the relatively am fewest shrinking copolyetheramide threads in water / water of 95 ° is of the order of magnitude of the copolyamide mentioned, while the copolyether amide with the highest tendency to shrink, experiences almost the same shrinkage even in water of 20 °. As said above was, for the curling tendency of the composite thread mainly the difference the shrinkage capacity of the two polymer components is important, it becomes clear what advantages the invention offers.

The composite threads according to the invention are made by known melt spinning processes produced, the spinning temperature being the homopolyamide used as the sheath component for melt spinning Usual temperature is chosen. Neither in the spinning process nor in the drawing process, changes to the usual process conditions are necessary.

A particular advantage of the composite thread according to the invention is therein to see that they can ripple even when immersed in water at normal temperature.

Compared to composite thread of a known type, in which the core, for example consists of polyethylene terephthalate and the sheath consists of a polyamide, the threads according to the invention have the advantage that they have a core and sheath because of the greater chemical similarity of the components remain firmly connected to each other.

Using the example, the production of composite thread according to the invention is explained:

Kittels of a spinneret used for the production of core-sheath composite threads with an eccentric core and jacket, the melt of a homopolyamide is spun (as jacket) and the copolyether amide of adipic acid, hexamethylenediamine and Aetheric arnin of the formula

H ₂ :; - (CH ₂ ), - o - (ch ₂ ) ₂ - o - (CH ₂ ), - NH ₂

(as the core). The temperature of the clamping device is about 280 °. - \; o- 9098U / mS _mMA1

■ * "· - ' ! Ϊ * \ ζ BATH ORIGINAL

Item GW 1231

The thread is released from the nozzle at a speed of 750 m / min peeled off, then cold drawn in a ratio of 1: 3.5 and wound up. Table II shows the textile data of composite threads according to the invention with different compositions of the copolyether amide and Quantitatively different core and shell proportions put together. Corresponding data from known composite threads are given for comparison.

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Weight percent l) polyamide made from caprolactam :Core Titer Table II Pestigk. Shrinkage Shrinkage ■ Frizzy Frizz 6UW7V8606 A coat: el) polyamide from adipic acid and the/ g / den (95 °) (20 °) Frizzy strain contra Composite thread materialJ. singles strain in water arc- tion Sheath core threads % numberP ^ro 10 centimeters 50 Polyamide ¹ 'copolyether 50: 50 40/10 5.9 18 % 7.4 % 175 % 70 % arnid 50: 50 Il 2.7 10 % C ry rff
3, ί / ο 557 9% 45 % A. 50; 50 Il 57.5 2.9 15 % , 5.6 % 79.5 22 % 16 % ,. _B. 70: 70 Il 20.0 4.0 · 16 % 7.0 % 154 65 % 62 {ί "C 50; 50 dd 55.4 5.2 26 % 11.4 fo not 110 <$> 79 % "A. 50: 50 It 40.0 2.9 16 fo 6.8 % certainly 197 % ■ 75 % A.
ο ^ 50: 50 η 54.4 5.5 15 % 5.2 % 954 78 % 48 % Polyamide ^ 'A 50: It 55.5 4.6 17 % 1.7 % 569 72 % 55 ⁰ A Polyamide ¹ 'copolyamide ⁵ ' 50.6 115 Polyamide 'polyethylene 56.8 CJ) terephthalate to σ * IlGxame co thylendiu (T) I. min

5) Copolyamide made from caprolactam and adylic acid-hexamethylenediamine in a ratio of 80:20 A) Copolyäthcrauiid from adipic acid-hexamethylcndiamine and ether diamine in the ratio 60

ß \ ti Il Il Il It ti »I ti -ZQ

Q \ Il It Ii II Il η ti It Qq

:::

BAO OBIOiNAL

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To measure the properties that are not known per se, were the following methods were used after the curl was induced by treatment with 95 ° water for 2 minutes.

1) crimp elongation

A piece of thread about im length treated in this way is now loaded with 50 mg / den, so that the crimp is largely pulled out. The stretched thread is on the top Attached to the edge of a slightly sloping wall. Then one clamps a smaller weight of 0.5 mg / den just above the weight and then carefully remove the larger weight. Under this load, the thread is left in a grain climate for 12 hours. To During this time you clamp the thread with the attached weight in an electronic tensile tester and determine the Elongation under load of 0.05 p / den.

2) Ki'äuselkontrakticn

You whiten strands of thread (3 m LL '^ e) and hang this J> 0 see tension-free in 70 ° warn.es distilled water. The wet strands are then loaded 1> .in with weights of 0.2 g / den. The length determined under this load is b. Kach Entfemur. 3 the weights dries rr.ur. the strands hanging freely without load pO minutes! ans at 50 - 60 ° and then air-conditioned them for 1 hour. After that they will be with a for 1 minute; Weight in front. 0, C02 g / den burdened. The calculated length is a. The calculation of the crimp contraction is done according to the equation

b - a

ⁱ ; 'o curl contraction = χ 100

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The diagrams also show the crimp elongations of various composite threads with a defined shrinkage possibility (sheet 1) and a given load (sheet 2). The curves show the course of the crimp elongation for composite threads of the following composition:

Curve a and a, = polycaprolactam and copolyether amide A (explanation see below table II)

Curve b and b, = polycaprolactam and copolyamide (made of 80 % capro-

lactam and 20 % hexamethylenediamine adipic acid)

Curve c and c, = polycaprolactam and polyethylene terephthalate.

The sheath consists of the first-mentioned polymer, the core of the thread of the second-mentioned. The quantity ratio of coat; The core is 50:50 in all cases and the denier is 40 den (10 individual threads).

To determine the crimp elongation values for sheet 1, the threads were each clamped in a frame with a clamp spacing of 30 cm in such a way that various shrinkage options were possible. With 10 % shrinkage possibility, the clamped thread length was, for example, 3JJ cm, with 80 % shrinkage possibility 54 cm. The threads clamped in this way were first boiled in water for 60 minutes, then dried for 60 minutes in hot air (60.degree. C.) and finally fixed in saturated steam at 115.degree. C. for J> min. The determination of the crimp elongation fr was carried out as described in connection with Table II, with the difference that the length of the measured pieces of thread was only 30 cm.

The crimp elongation values shown on sheet 2 were determined after the threads had been treated in water for 2 minutes at 95 ° C. under the loads shown in the diagram.

It can be seen from both diagrams that the composite thread according to the invention has the most favorable crimp.

9098U / 1749

Claims (2)

Claims ( 1)) Composite thread made of two differently shrinking polymers with an eccentric design of core and jacket, characterized in that the jacket is made of a homopolyamide and the core is made of a copolyether amide, which is obtained by polycondensation of adipic acid with 75-20 mol, preferably 50- 40 mol # ether diamine of the formula H ₂ N - (CH ₂ ) ₅ - R - (CH ₂ ) ₅ - NH ₂ where R is the groups -0- or -0- (CH ₂ ) -0- and η can be 2-4, and 25-80 mol, preferably 50-60 mol # hexamethylenediamine has been prepared. 2) composite thread according to claim 1, characterized in that the sheath made of polyhexamethylene adipamide or polycaprolactam and the core of the copolyether amide, which is formed by polycondensation of adipic acid with 40 MoI ^ ether diamine of the formula H ₂ N - (CHg) ₅ - 0 - (CH _{2) 2} - 0 - ₅ g and 60 ₂ Mo 1 $ Hexamethanlendiamin was prepared composed. Composite yarn according to claims 1 and 2, characterized in that the weight ratio of sheath core ι between JO: is 20: 70 and the 70th 909844/1749