Henley's Twentieth Century Formulas, Recipes and Processes. Various

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СКАЧАТЬ applied to rubber the ammonia softens it, but it quickly evaporates, leaving the rubber in the same condition as before. The shellac clings to the iron and thus forms a firm bond between the iron and the rubber.

III.—	Gutta percha white	1 drachm
Carbon disulphide	1 ounce
Dissolve, filter, and add:
India rubber	15 grains
Dissolve.

      Cement For Metal On Hard Rubber.

      —I.—Soak good Cologne glue and boil down so as to give it the consistency of joiners’ glue, and add with constant stirring, enough sifted wood ashes until a homogeneous, moderately thick mass results. Use warm and fit the pieces well together while drying.

      How To Unite Rubber And Leather.

      —II.—Roughen both surfaces, the leather and the rubber, with a sharp glass edge; apply to both a diluted solution of gutta percha in carbon bisulphide and let this solution soak into the material. Then press upon each surface a skin of gutta percha 1/10 of an inch in thickness between rolls. The two surfaces are now united in a press, which should be warm but not hot. This method should answer in all cases in which it is applicable. The other prescription covers cases in which a press cannot be used. Cut 30 parts of rubber into small pieces, and dissolve it in 140 parts of carbon bisulphide, the vessel being placed on a water bath of 30° C. (86° F.). Further, melt 10 parts of rubber with 15 of colophony, and add 35 parts of oil of turpentine. When the rubber has been completely dissolved, the two liquids may be mixed. The resulting cement must be kept well corked.

      To Fasten Rubber To Wood.

      —I.—Make a cement by macerating virgin gum rubber, or as pure rubber as can be had, cut in small pieces, in just enough naphtha or gasoline to cover it. Let it stand in a very tightly corked or sealed jar for 14 days, or a sufficient time to become dissolved, shaking the mixture daily.

      II.—Dissolve pulverized gum shellac, 1 ounce, in 9 ¹/₂ ounces of strong ammonia. This of course must be kept tightly corked. It will not be as elastic as the first preparation.

      III.—Fuse together shellac and gutta percha in equal weights.

IV.—	India rubber	8 ounces
Gutta percha	4 ounces
Isinglass	2 ounces
Bisulphide of carbon	32 ounces
V.—	India rubber	5 ounces
Gum mastic	1 ounce
Chloroform	3 ounces
VI.—	Gutta percha	16 ounces
India rubber	4 ounces
Pitch	4 ounces
Shellac	1 ounce
Linseed oil	1 ounce

      Amalgamate by heat.

      VII.—Mix 1 ounce of oil of turpentine with 10 ounces of bisulphide of carbon in which as much gutta percha as possible has been dissolved.

      VIII.—Amalgamate by heat:

Gutta percha	100 ounces
Venice turpentine	80 ounces
Shellac	8 ounces
India rubber	2 ounces
Liquid storax	10 ounces

      IX.—Amalgamate by heat:

India rubber	100 ounces
Rosin	15 ounces
Shellac	10 ounces

      Then dissolve in bisulphide of carbon.

      X.—Make the following solutions separately and mix:

(a)	India rubber	5 ounces
Chloroform	140 ounces
(b)	India rubber	5 ounces
Rosin	2 ounces
Venice turpentine	1 ounce
Oil of turpentine	20 ounces

      {23}

      Cement for Patching Rubber Boots and Shoes.—

I.—	India rubber, finely chopped	100 parts
Rosin	15 parts
Shellac	10 parts
Carbon disulphide, q. s. to dissolve.

      This will not only unite leather to leather, india rubber, etc., but will unite rubber to almost any substance.

II.—	Caoutchouc, finely cut	4 parts
India rubber, finely cut	1 part
Carbon disulphide	32 parts

      Dissolve the caoutchouc in the carbon disulphide, add the rubber, let macerate a few days, then mash with a palette knife to a smooth paste. The vessel in which the solution is made in both instances above must be kept tightly closed, and should have frequent agitations.

      III.—Take 100 parts of crude rubber or caoutchouc, cut it up in small bits, and dissolve it in sufficient carbon bisulphide, add to it 15 parts of rosin and 10 parts of gum lac. The user must not overlook the great inflammability and exceedingly volatile nature of the carbon bisulphide.

      Tire Cements.—

I.—	India rubber	15 grams
Chloroform	2 ounces
Mastic	1/2 ounce

      Mix the india rubber and chloroform together, and when dissolved, the mastic is added in powder. It is then allowed to stand a week or two before using.

      II.—The following is recommended as very good for cementing pneumatic tires to bicycle wheels:

Shellac	1 ounce
Gutta percha	1 ounce
Sulphur	45 grains
Red lead	45 grains

      Melt together the shellac and gutta percha, then add, with constant stirring, the sulphur and red lead. Use while hot.

III.—	Raw gutta percha	16 ounces
Carbon bisulphide	72 ounces
Eau de Cologne	2 2/3 ounces

      This cement is the subject of an English patent and is recommended for patching cycle and motor tires, insulating electric wires, etc.

      IV.—A good thick shellac varnish with which a small amount of castor oil has been mixed will be found a very excellent bicycle rim cement. The formula recommended by Edel is as follows:

Shellac	1 pound
Alcohol	1 pint СКАЧАТЬ В начало < 12 13 14 15 16 17 18 19 20 21 > В конец