DE745580C - Process for the production of rayon threads from mixtures of polyvinyl alcohol and cellulose and / or vegetable or animal protein - Google Patents

Description

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The invention relates to a method for producing rayon threads from polyvinyl alcohol and cellulose and / or vegetable or animal protein. Whereby S the necessary measures are about the following:

i. It prepares ¹ WITD a viscose liquid output by a -wäßrige or aqueous-alkaline solution of polyvinyl alcohol with viscose or an alkaline solution of protein, such as Sojabohhencasein, milk casein and Fjsch'eiweiß mixing.

2. This starting liquid is after

the usual wet spinning process in one case5 bath spun, the predominant component of which is water. -

Diabej. rayon threads are of good quality Preserved firmness and elasticity.

It is already known that both Viscose can be used as well as alkaline protein solutions for the production of m rayon yarns according to the wet spinning process. Up to now, however, it has not yet been proposed to process an aqueous or alkaline polyvinyl alcohol solution together with one of the abovementioned substances into firm and elastic rayon threads by the wet spinning process.

It has now been found that it is possible when using the mixed solutions in 3c to spin cozy viscose felling baths and that felling baths are useful, the neutral ones Contains salts and possibly acids, if one is made from protein and polyvinyl alcohol containing spinning solution is used. 3i

The threads produced in this way ■ are due to their content of polyvinyl alcohol J get more in non-salty water or |

less soluble or swellable and must therefore still be wet, half or fully dried State of a single or multi-stage hardening in an aqueous form containing Glauber's salt and / or 5 'ammonium sulfate aldehyde solution, in the presence or absence of • acid or alkali, are subjected. The products obtained in this way are then washed with water and treated dries, they have good strength and elasticity in dry and wet condition.

One or more of the following substances can also be added to the viscous starting liquid added: vegetable or animal oils, mineral oil, precondensation products from Urea, thiourea or phenol with formaldehyde, colloidal stabilizers, such as soap and sulfuric acid esters of higher alcohols. That happens to the threads still to make it more waterproof. To regulate the viscosity or the coagulability of the Starting solution can also contain one or more of the following substances in an amount be added, which is insufficient to premature precipitation of the polyvinyl alcohol cellulose or cicatricial spinning solution: organic liquids miscible with water, such as methyl alcohol and ethyl alcohol, dilute acids such as sulfuric acid, hydrochloric acid and acetic acid, water-soluble alkali, alkaline earth or metal salts, or the like. An improvement the spinnability is achieved by adding formaldehyde to the 'precipitation baths or another suitable aldehyde is added. The invention will be explained in more detail with the aid of the following examples.

example 1

ι Part of ordinary, dry and pure polyvinyl alcohol is added to 8 parts of water and dissolved in it by heating. 1 part viscose containing 70/0 cellulose and 6o / _o alkali is added to part of this solution with intimate mixing. The starting liquid prepared in this way is spun through conventional spinnerets into a precipitation bath which contains 300 g of Glauber's salt and ι log sulfuric acid per liter.

The filaments thus obtained are then kept at room temperature for about 5 hours' in a bath of the following composition: sulfuric acid ioo / _0, Glauber's salt 23 0/0, zinc sulfate 3p / o, formaldehyde, 3.5 ° / o water 60.50 / 0th

The so "hardened threads are with Washed with water, desulphurized, bleached and dried in the usual way. You get Threads of a glossy white color and a strength of 2.8 g per denier and an elongation "from 20 0/0.

Example 2

Part more common, dry and pure Polyvinyl alcohol is dissolved in 8 parts of water by heating. To 1 part this aqueous polyvinyl alcohol solution becomes part of an alkaline solution of soybean protein with a content of 20 0/0 soybean protein and 1.80 / 0 alkali. The liquid obtained in this way is then spun into a precipitation bath through conventional spinnerets, which contains 350 g of ammonium sulfate and ι iog Glauber's salt per liter. 1

The webs are then treated for 12 hours at room temperature in a curing bath of the following composition: sulfuric acid ioo / _0, ammonium sulfate 300/0, formaldehyde 3,50 / 0, water balance.

After this hardening, it is washed with water and dried in the usual way. Synthetic threads of glossy white color and a strength of 2 g each are obtained Denier and an elongation of 30 0/0.

85 Example 3

ι part more ordinary, drier and purer Polyvinyl alcohol is dissolved in 8 parts of water by heating. To 1 part of this aqueous polyvinyl alcohol solution is, with intimate mixing, 1 part of viscose containing 70/0 Cclullose and 6 0/0 Alkali, and besides ι Part of an alkaline solution of soybean protein with a content of 200/0 Egg white and 1.70 / 0 alkali given. The received Liquid is then spun through conventional spinnerets into a precipitation bath containing 350 g of ammonium sulfate and 110 g of Glauber's salt per liter and contains ι iog sulfuric acid.

The webs are finally treated for 12 hours at room temperature in a hardening bath with the following composition: sulfuric acid _100% Glauber's salt 230/0, zinc sulphate 30/0, formaldehyde 3.5%, water 60.50/0.

The hardened fibers are washed with water, desulfurized and bleached in Usually dried. Rayon threads of a glossy white color are obtained a tenacity of 2.2 grams per denier and an elongation of 250/0.

Example 4

ι Part of ordinary, dry and pure polyvinyl alcohol is made by heating in 8 parts of water dissolved. 1 part of a 15% strength solution is added to 10 parts of this solution of milk casein added by dissolving the casein in a 0.50/0 alkaline solution was produced. The ready-to-spin solution thus obtained is passed through ordinary nozzles spun in a coagulation bath, -. the im

Liter 280g Glauber's salt and 150 g magnesium sulfate contains dissolved. The. The threads obtained in this way are hardened in a bath with the following composition: sulfuric acid ι ο 0/0, Glauber's salt 250/0, formaldehyde 30/0, Was.ser 62 0/0. Curing takes 10 hours at room temperature. Will the hardened ones Washed threads with water, a structure is obtained, the strength of which amounts to 2. S 0/0 per denier and its Elongation is 28 0/0.

Claims (1)

Claim: Process for the production of rayon thread from mixtures of polyvinyl alcohol and cellulose and / or vegetable or animal protein, characterized in that a ^{spinning solution consisting of aqueous polyvinyl alcohol solution and Vis 1} -cose and / or alkaline protein solution is converted into an aqueous, optionally sulfuric acid or Salt solution containing formaldehyde is spun and the coagulated filaments are then converted into a water-insoluble state by means of a formaldehyde solution which may contain sulfuric acid, sodium sulphate, zinc sulphate or ammonium sulphate. To distinguish the subject of the application from the state of the art, the granting procedure no pamphlets have been considered. BERLIN. OEnWUCKT IN UKH