| 摘要 |
Articles of rubber-like material are prepared by directly depositing in the desired shape the solids of an aqueous dispersion of a copolymer of butadiene and styrene containing a polyterpene hydrocarbon resin such as those known under the name of "Nypene" and "Piccolyte," and then drying and vulcanizing the solids so deposited. The articles may be directly deposited either onto a former by dipping or spraying or by spreading on a blanket in the case of sheet material. In an example, 75 parts of butadiene and 25 parts of styrene are emulsion copolymerized in the presence of 5 parts of soap and the emulsion creamed by the addition of ammonium alginate solution followed by potassium hydroxide solution. After standing, a vulcanizing paste containing sulphur, zinc oxide, zinc mercaptobenzothiazole and dibutyldithiocarbamate, and dispersing agents in water, is added to the cream, and the whole mixed with a dispersion obtained by treating a solution of 100 parts of the polyterpene in 100 parts of naphtha containing 10 parts of oleic acid, with a solution of 10 parts of 25 per cent dimethylaniline in 180 parts of water, the mixture then being spread and vulcanized. In a second example, methyl isobutyl ketone is used as the solvent for the polyterpene. The resultant improvements in tensile strength and ultimate elongation is compared with the results obtained by similar mixes containing natural rubber.ALSO:Articles of rubber-like material are prepared by directly depositing in the desired shape the solids of an aqueous dispersion of a copolymer of butadiene and styrene containing a polyterpene hydrocarbon resin, such as those known under the name of "Nypene" and "Piccolyte," and then drying and vulcanising the solids so deposited. The articles may be directly deposited either on to a former by dipping or spraying, or by spreading on a blanket in the case of sheet material. In an example, 75 parts of butadiene and 25 parts of styrene are emulsion copolymerized in the presence of 5 parts of soap and the emulsion creamed by the addition of ammonium alginate solution followed by potassium hydroxide solution. After standing, a vulcanising paste containing sulphur, zinc oxide, zinc mercaptobenzothiazole and dibutyldithiocarbamate, and dispersing agents in water, is added to the cream, and the whole mixed with a dispersion obtained by treating a solution of 100 parts of the polyterpene in 100 parts of naphtha containing 10 parts of oleic acid with a solution of 10 parts of 25 per cent dimethylamine in 180 parts of water, the mixture then being spread and vulcanized. In a second example, methyl isobutyl ketone is used as the solvent for the polyterpene. The resultant improvement in tensile strength and ultimate elongation is compared with the results obtained by similar mixes containing natural rubber.
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