US1729474A - Treatment of felt and felt-hat bodies - Google Patents

Description

Patented Sept. 24, 1929 1,729,474

' UNITED STATES PATENT OFFICE ERICH noun, or VIENNA, AUSTRIA TREATMENT OF FELT AND FELT-HAT BODIES No Drawing. Application filed september 2, 1926, Serial No. 133,298, and in Austria June 1, 1926. Modern chemistry makes a neat distincdrolysis. Thus for instance by neutralizing tion between metal compounds of the first chromium alum or chromium sulphate it is order 'thatis to say compounds in the molecule not chromium hydroxide Cr,(OH) that isof which a metal is directly combined with directly obtained buta series ofintermediary i a plurality of atoms of other atoms all of compounds namely:

which are of equal nature, and metal compounds of a higher order that is to say com- Cr4(OH)2(SO4)5 Cr4(OH)4(SO4)-= pounds the molecules of which result from down to Gr,(OH), SO and thereafter chrothe combination of a plurality of molecules mium hydroxide Cr, .(OH) is precipitated in l of compounds of the first order. the form of a gel. 0 An example of a compound of the first order These metal compounds of a higher order is stannic chloride, SnCl, while an example or complex metal compounds frequently form of a compound of the second order is pink. colloidal solutions as for instance the chrosalt min? compounds just referred to.

s I ave discovered that the a ueous solu- (NH4)ZSH('I QNHC1 S1101" tions of metal compounds of a higher order or and an example of a compound of the third complex metal compounds as above defined order is preparing salt or sodium stannate have tilelal property of increasing the lustrle of anima air more articularl of wool lair NflzSMOH) 6 2N3OH+SHO2+2H2O especially if the solutions are colloidal, and Such compounds of a higher order are parmany of thes c mpl x m tal compounds are ticularly readily formed by metals electroknown to be tanning agents, that is to say negative to aluminium and electro-positive to any agents capabl f hardening animal 1- mercury and having a small atom volume and la nous ub ta Now y invention cona comparatively high atomic combining c sists in treating felt and felt hat bodies with pacity such as, iron, zinc, cobalt, nickel, copheavy metal compounds of higher order or p81, tin, bismuth and before all the metals Of complex compounds of heavy metals by apthe chromium group, namely chromium, tungplyin aq ou s luti ns of s ch compounds sten, molybdenum and uranium. Examples to the felt or felt hat bodies separately or in of such compounds of higher order, or as they any stage of their manufacture such as brushare often called complex compounds are the ing or bl ki g metaltungstates, as [OW(VVO ]K the The following is a description of several metal ammines for instance hexammino-coexamples of carrying into practice my invenbalti chloride [Co(l lH,) ]Ql and its prodtion:

uctsof substitution. for instance triaquo- 1. I prepare a chromium tanning liquor 8 triammino-cobalti-chloride by neutralizing a normal chromium salt for [CO (H O) (NH) 1C] instance chromium alum such tanmng liquor 2 a a s 3 containing about 0.5 to 1% of chromium.

or monochloro-1 entammino-cobalti-chloride This tanning liquor has still to contain about F H HJH] in which the groups com- 0.1% of sulphuric acid which may be secured bined with potassium or chlorine respectively either by neutralizing the chromium salt only appear to be self consistent radicles which do to the limit indicated or by addlng to a llquor not undergo any change if these complex more completely neutralized, a sufliclent quanchlorides are converted into nitrates, sultity of sulphuric acid or chromium alum. ph ates, carbonates and the like. The presence of the small quantity of ac d has To these compounds ofhigher order or com for its object to prevent the preclp tation of plex compounds also belong the so called basic chromium hydroxide on the hair which would chromium salts of very complicated c0nproduce green spots on the felt. stitution formed in neutralizing chromium This tanning liquor is heated to about 70 to compounds split up to a great extent by hy- 80 centigrade and the felt hat bodies are placed into the liquor and left therein under slow agitation for about A; to 2hours according to the quality of the felt. The hat bodies are then taken out and thoroughly rinsed. They have then a beautiful lustre and show a silk like firm hair. They can then be dyed and further treated in the usual manner.

The chromium tanning liquor may also be prepared by the reduction method used by tanners in which a concentrated solution of potassium bichromate and sulphuric acid is reduced by glucose, glycerine, or sulphur dioxide. The green solution contains the chromium compounds of higher order or complex chromium compounds but their percentage varies according to the conditions of reduction and therefore the effect on the felt is somewhat uncertain and besides the felt is liable to be discoloured. Also the commercial chromium tanning liquors or salts may be used.

2. The velour felt hat bodies are placed into a solution of pink salt (NI-I SnCl,,, containing about 1 to 2% of tin and about 0.1 to 0.3% of sulphuric acid and kept there under slow agitation at a temperature of 7 0 to 80 centigrade for to 2 hours according to the quality of the hat bodies. The latter are then rinsed and dyed in the usual way.

3. The felt hat bodies are placed into a 1% solution of preparing salt, Na Sn(OI-I) G and 0.5 to 1% of peroxide of hydrogen at a temperature of 7 0 to 80 centigrade and kept there under slow agitation for to 1 hour. I Thereby the aspect of the felt becomes smooth and leather. like and velour felt hat bodies acquire a high lustre. The addition of peroxide of hydrogen is necessary for preventing the discolouring of the felt, taking place in alkaline solutions. In using this alkaline solution care must be taken to avoid any injury to the felt which might result from a prolonged action of the felt.

4. I prepare an aqueous solution of a tungstate or molybdate soluble in water and containing about 1% of tungsten or molybdenum and add thereto sulphuric acid so that it contains 0.1 to 0.3% thereof. In the case of tungstate solutions the addition of 0.5 to 1% of peroxide of hydrogen is necessary for preventing tungstic acid from being precipitated. The neutral or acid solutions of tungstates or molybdates contain tungsten and molybdenum in the form of complex compounds orcompounds of a higher order since the tungstates or molybdates of the first order K VVO and (NI-LQ MOQ can exist only in a strongly alkaline solution; the commercial ammonium molybdate for instance has the formula (NH M0 0 plus 41-1 0. The felt hat. bodies, more particularly velour felt hat bodies are placed and kept therein for to 2 hours at a temperature of to 80 centigrade under slow agitation. Thereby velour felt hat bodies having a high lustre are obtained which may be dyed and further treated in the usual manner.

The complex metal compounds as above defined may also be used for brushing velour felt hat bodies or added to such brushing Water; they may be also added to the blocking water. 1

I Wish it to be understood that I do not claim the use of potassium bichromate nor the use of ordinary double salts such as potassium aluminium alum.

What I claim is:

1. A process for treating felt and felt hat bodies for increasing the lustre thereof consisting in applying thereto an aqueous S0111? tion of a complex compound of a heavy metal of the chromium group. i

2. A process for treating felt and felt hat bodies for increasing the lustre thereof consisting in applying thereto an aqueous solution of a complex compound of chromium.

3. A process for treating felt and felt hat bodies for increasing the lustre thereof consisting in applying thereto an aqueous solution of a complex compound of a heavy metal by placing the felt and felt hat bodies into an 1 aqueous solution of such complex salts and keeping them therein at a temperature above room temperature and below the boiling point of water for some time under slow agltation.

4. A felt hat body having incorporated into its fibres an inorganic tanning agent.

5. A velour felt hat body having incorporated into its hair an inorganic tanning agent.

In testimony whereof I have aflixed my signature.

ERICH BGHM.