Asphalt/polyol emulsion and process for preparation thereof
AssigneeToa Dora Kogyo Co., Ltd.
InventorsSaburo Wakizaka, Hiraku Hayasaka, Kazuki Hashimoto, Kentaro Shiojiri, Toshiaki Suzuki
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Abstract
An asphalt/polyol emulsion is prepared from asphalt and polyol which are mixed and emulsified with a surface active agent and the plasticizer, by utilizing the behavior of a plasticizer according to the polymer solution theory and the surface-modifying effect of the plasticizer according to the surface chemistry.
Claims15
An asphalt/polyol emulsion formed by emulsifying asphalt with an emulsion of a polyalkylene glycol and a mixture of at least one surface active agent and a plasticizer, with the proviso that the molecular weight of the polyalkylene glycol is such that the asphalt and glycol are immiscible, wherein the asphalt constitutes 30 to 65% by weight of the asphalt emulsion, the weight % of the mixture of surface active agent is 1.5-6% based on the weight of asphalt, the weight % of the plasticizer is 2.5 to 15% based on the weight of asphalt and the remainder is polyalkylene glycol.
A process for the preparation of an asphalt//polyol emulsion, which comprises adding a surface active agent to a heated polyalkylene glycol to form a polypropylene glycol solution, adding a plasticizer to the resulting mixture of asphalt and the polypropylene glycol solution while said mixture is still under such temperature condition that the asphalt and the polypropylene glycol solution in the mixture are not separated from each other, and stirring the obtained mixture, with the proviso that the molecular weight of the polyalkylene glycol is such that the asphalt and glycol are immiscible, wherein the asphalt constitutes 30 to 65% by weight of the asphalt emulsion. the weight % of the mixture of surface active agent is 1.5-6% based on the weight of asphalt, the weight % of the plasticizer is 2.5 to 15% based on the weight of asphalt and the remainder is polyalkylene glycol.
The emulsion claimed in 1 wherein the surface active agent has an HLB value of about 13 to about 18.
Dependencies are inferred from the claim text.