Effect of Sulfuric Acid Coagulation on Properties of Natural Rubber
| Autor: | L. L. Best, S. H. Morrell |
|---|---|
| Rok vydání: | 1955 |
| Předmět: |
Materials science
Polymers and Plastics technology industry and agriculture Vulcanization Sulfuric acid Pulp and paper industry complex mixtures law.invention body regions chemistry.chemical_compound chemistry Natural rubber law visual_art Materials Chemistry visual_art.visual_art_medium Coagulation (water treatment) Composite material Raw rubber Softening Normal range |
| Zdroj: | Rubber Chemistry and Technology. 28:1185-1192 |
| ISSN: | 1943-4804 0035-9475 |
| Popis: | The data indicate that the use of sulfuric acid in normal amounts as a coagulant has no deleterious effect on the properties of the raw rubber or on vulcanizates made from the raw rubber. When four times the normal dosage of sulfuric acid was employed, there was a slight softening of the raw rubber, but all samples examined had properties within the normal range of plasticity associated with natural rubber. The tendency to scorch and the rate of vulcanization of rubbers do not appear to be affected appreciably by the method of coagulation: any differences which may exist are not of such a magnitude as to cause the production of abnormal rubbers. It would seem that the use of excessive quantities of sulfuric acid during the coagulation of latex may cause some deterioration to the rubber. The sole advantage in using excess would appear to be a reduction of the time needed to complete coagulation. It should be noted, however, that the main reason for the use of sulfuric acid is economic, and it does not seem logical that the producer would use more than is necessary and thereby increase his coagulation costs. If the producer were to use four times the normal dosage of sulfuric acid, the material costs would be about twice those for the normal quantity of formic acid. |
| Databáze: | OpenAIRE |
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