| 配方类型： |
ELEMENTARY Preparations |
| 配方说明： |
soaps are made fron a fat or fatty acid and an alkali. they
lathetr and produce a foam which entraps dirt and grease. there are
many kinds of soaps.
cleaners contain a solvent, such as naphtha, with or without a soap.
abrasive cleaners are soap pastes containing powdered pumice, stone,
ailica, etc. |
| 配方组成： |
waterproof.
the following composition and method of application will make
paraffin (M.P. about 130 F)/22.5
trihydroxyethylmine stearate/3/0
uncalendered paper, fiberboard, and similar porous material
waterproofing paper and fiberboard
water/74.5 |
| 配制方法： |
the paraffin wax i9s melted and the stearate added to it. the water is then heated to nearly the boilindg point and vigorously agitated with a suitable mechanical stirring device while the mixture of melted wax and emulsifier is being slowoy added. this mixture is cooled while it is stirred. the paper on fiberboard is coated on the side which is to be in contact with w3ater. this method works most effectively onpaper-pulp molded containers and has the advantage of being much cheaper than dipping in melted paraffin as only about one tenth as much paraffin is needed. in addition, the outside of the container is not greasy and can be printed on after treatmendt which is not the case when treating with melted wax. |
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