US1851893A - Preparation of wool containing fabrics for dyeing purposes - Google Patents

Description

Patented Mar. 29, 1932,

nunom'nnaucxmnmza; or anminm'w, G-ERMANY, ASSIGNOR TO DEUTSCHE woman- WARENLMANUFAKTUR:AKTLENGESELLSGHAFT, or GRU Ene, QHGERMAINY nannies; or wool," eomarnma FABRICS iEOR :DYEI'NG rim-rosns a, mating. Application oiil ed A 'r'n 10, 1928, semi 26am, and in Germany amen '93, 152k.

' I This invention"r alaftes to a method for preparing wool containing fabricsfor dyeing P P eS-o i Q a vThe d eing of wool containing fabrics in the pieceisaproblem whichhas not been solvedyet in a satisfactory manner. The fabrics namely contain fatty and mineral spinning. oils and lubricating oils from the looms. They furthencontaimfthi's is especially-the case withhalf-wool'en fabrics a certain content of size and often cellulose derivatives, when old material and rags containing artificial silk are used in the manufacture of the fabric, which contain furthermore dirt and other foreign substances. -Until now the wool containing fabrics were subjected to a washing treatment with alkaline reacting washing liquids, in order to make them suitable for dyeing purposes. This washing treatment lasted several hours; it was, however, not satisfactory and the dyeing of the washed fabrics could not be carried out without difiiculty, as the foreign substances interfering with the dyeing process were not removed by the washing. Furthermore the treatment of the fabric with alkaline reacting washing liquids chemically affected the wool fibres, thus diminishing the quality of the fabrics.

The above mentioned disadvantages are avoided, when working according to the invention, which consists in treating the wool containing fabrics with certain organic solvents for cellulose ethers and cellulose esters and washing the treated fabrics with common water. Not all the organic solvents for cellulose ethers and esters are suitable for the purpose of the invention, as only those solvents come in question, which are removable from the fabric by a treatment with water at temperatures below C. Solvents which cannot be completely removed from the fabric by a treatment with water at temperatures below 60 C. are not suitable, as they would afi'ord for removing them completely from the fabric temperatures changing the properties of the wool fibres of the fabric, thereby diminishing the quality of the fabric. The organic solvents for cellulose ethers and esters used for treating the fabrics do not only remove, the 'c'ell'tu lose "derivatives from the wool [containing fabrics, butals'oijem'ove allth'e other may and oily matter-fromthe fabric. the. washing ,withwat'er following the treatment of the fabric with solvent, for removing all the solvent absorbed by and adheringoh the fabric, size and dirt are also removed from the fabric. I

When workingaccordingto the invention the'wool 'cohtai'ning fabrics are prepared for dyeing purposes two successive, and very sii'nple steps, namely the, treatment with deiftain oi, 'anic solvents and the'washing with water, "thereby removing all the a'nd parts-of th'efabri'c, which are hoigid'us, h dy n Ifh fa ri may 'Eb i i?n th Pie w' i tl f bl a fabricis hemieau ana physically o H aged, as no noxious chemical substantiated n 0 tenip'eraturesabove 60 oare em' loy The treatment the fabric bout rl' imim s, wheres. the-t ea m wi h alkaline reactijng washing'liquif d u'sed;"lliltfil now theart,' las'ts at l easttwo iiour's, With-V t y e agsa sf wryes 1i v. ol tsa 'ap edfor hr p ie ftheih n a th fl qe d es rs f a iph ti at y acids such as methyljacetata ethylacetate t'he like-, liquid ,k'etone's such fas acetone, y hyl 1 ket n are th i i and 0W- boi lingchloriniited hydrocarbons such as isopropylchloride, methylenechlori de and the like. Qbviouslyalso, miktures ofv these solvents be used,

The removal ofthe sOlveht's adhering on the'fabri'cafter the treatment withsolvehits takes placefaccording to different-principles. The esters a'nd keton'es used are water soluie and are thereforegsdis solved :during the wash ing process following the treatmentwith solvents. Thejchlorinated hydrocarbonsare not. water, soluble. They arethereforeto he lie 'e iri Su h nn ra het t y egbei ing a at temperatures ib elow j 60 "in contradistinc tion myths 1 wate soluble solvents, which maybiiilathi 'her inp'eratur'e's, washing of the fabrics treated with; Ts'oivent's not soluble in water" has tobe cairidfo'iit with warm water of a temperature slightly Examples 1. A piece of cloth, made from carded yarn greased with oleine and consisting of wool and artificial wool is continuously drawn through one or several baths containing methyl acetate, which is if necessary slightly heated; The methyl acetate treatment is followed by a washing with cool water in one or several baths, through which the fabric is drawn after it has been squeezed, when coming out of the last methyl acetate bath. The time necessary for the whole treatment of the piece of cloth is about 10 minutes, after which the fabric is ready for dyeing urposes.

The methyl acetate enriched wit oleine is subjected to a distillation, thereby recovering methyl acetate as condensate and oleine as residue. The wash water is used so often, until it is enriched in methyl acetate. It is then also worked up by distilling off the methyl acetate.

2. A piece of half-woolen cloth made from Wool, artificial wool and cotton and greased with mineral oil is treated in the same man- I ner as in Example 1. The solvent used is a mixture of methyl acetate and methylenechloride. The washing is carried out very thors oughly in closed containers with water heated at 48 C. The solvents distilled off during the washing are condensed, whereas the solvent dissolved in the water is recovered after enrichment of the water by distillation. Duration of the treatment about 8 minutes.

3. A piece of cloth made from wool, artificial wool and waste material containing artificial silk is treated with a mixture of isopropylchloride and methylenechloride. By washing in a closed container with warm water of about 45 C. the mixture of the solvents adhering on the fabric is distilled off and recovered by condensation. The solution of cellulose acetate and spinning oil in the solvents is worked up to pure solvents, cellulose acetate and spinning oil. Duration of the treatment about 12 minutes.

4. A pieceof cloth made from wool and artificial silk remanufactured from rags is treated with methyl acetate or acetone, thereby removing the oily matter and the cellulose derivatives from the fabric. The solvent adhering on the fabric is removed by a treatment with water. Duration of the treatment about 10 minutes.

I claim:

1. A method for preparing wool-containing fabrics for dyeing purposes, the said fabrics consisting at least in part of threads made from artificial silk; comprising the steps of treating the fabrics with a single liquid organic solvent, which possesses the property of removing any cellulose acetate which may be present in the artificial silk, and also the property of removin other fatty and oily impurities from the abric, the said organic solvent being itself removable from the fabric by water at temperatures below 60 0.; and then washing the treated fabrics with water at a temperature'below 60 0., in order to remove any of the organic solvent still remaining in the fabric.

2. A process for preparing wool-containing fabrics for dyeing purposes, as described in claim 1, in which the liquid organic solvent is chosen from the group consisting of methyl ethyl ketone, isopropyl chloride, and methylenechloride. i

In testimony whereof I afiix my signature.

RUDOLF BRAUCKMEYER.