Патент USA US2108912код для вставки
2,108,912 I Patented Feb. 22, 1938 V UNITED STATES PATENT OFFICE 2,108,912 DEFOAMING METHOD AND DIEANS Harland H. Young, 'Jr., Chicago, Ill... assignor to Industrial Patents Corporation, Chicago, 111., a corporation of Delaware N0 Drawing. Application July 9, 1935, Serial No. 30,577 5 Claims. (Cl. 252-6) This invention :relates to the prevention of foaming or frothing in the preparation or use of solutions, suspensions or mixtures of various kinds which have a tendency to produce foam 5 or froth. _ One of the objects of this invention is to pro vide an improved‘ defoamer which may be added to such material as glue to prevent foaming when the glue is used as it normally is used in aqueous 10 solutions. Other objects of the invention will be appar _ ent from the description and claims which follow. It is lmown that water insoluble metallic soaps are more or less e?ective as defoamers when the 15 metallic soap is dissolved in an organic solvent such as para?in or tallow/and a dispersing agent such as sulphonated oil- or sulphonalted tallow is added. It is also known that some deioaming ef feet is secured by the use of a water insoluble 29 metallic soap dissolved in an organic solvent such as pine oil. - I The present invention is directed to an un red oil. This solution is then emulsi?ed with 30 to 50 pounds .of water in which form it is ready for use. ~ ‘ Although trivalent aluminum is known to form only the mono- and di-stearate and not the tri- 5 stearate, I ?nd that by using a quantity of stearic acid which approximates the quantity necessary to convert a di-stearate to a tri-stearate,v the re sulting defoamer is unusually effective and not only has greatly increased defoaming power but 10 also inhibits separation of a scum of aluminum stearate on the surface of glue to which the de foamer has been added. As used in this speci?cation and in the claims, the term “solution" will be understood in its 15 broad sense as including true soluti0ns,'suspen soids, and colloids. I cl: " 1. A defoamed product consisting of a mixture of a foable substance capable of aqueous 20 solution, and a deioamer comprising aluminum stearate, stearic acid and wax dispersed in the \ usually e?ective deioamer which is inexpensive ioamable substance. 2. A defoamed product comprising a mixture to prepare. The defoamer of the present inven 25 tion is prepared by ?rst dissolving aluminum of a foamable substance capable of aqueous soiu- 25 stearate in free steeric acid. The solution is sub= _ tion, and a defoamer comprising ? aluminum sequently diluted with para and the result= stearate and stearic acid. 3. A deioamer comprising wax, alum ing was: is then emulsi?ed with the glue or other mixture from which it is desired to remove the stearate and stearic acid. , 4. The process of preparing a defng agent 30 30 foaming characteristic. which comprises dissolving aluminum stearate in An example of a suitable formula is as follows: stearic acid and thereafter diluting the solution Fifteen parts ofv aluminum stearate are dis solved in 90 to 100 parts of stearic acid and to with paramn wax. 5. The process of preparing, a defoaming agent this solution are added‘90 pounds of para?n wax 35 and 100 pounds of Japan wax. This wax isthen which comprises dissolving aluminum stearate in 35 made up into the defoamer as follows: 45 pounds stearic acid and. thereafter diluting the solution of wax are dissolved in 135 pounds of tallow, so with wax. pounds of castor oil, and, 30 pounds of whey" ': i ‘Qili . YOUNG, Jn.