7575-23-7Relevant articles and documents
Method for preparing pentaerythritol tetra (3-mercaptopropionic acid) ester
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Paragraph 0024-0050, (2021/03/30)
The invention relates to the field of chemical synthesis, in particular to a method for preparing pentaerythritol tetra (3-mercaptopropionic acid) ester, the method comprises the following steps: using dichloromethane as a solvent, N, N '-dicyclohexylcarbodiimide (DCC) as a water-carrying agent and 4-dimethylaminopyridine (DMAP) as a catalyst, carrying out esterification reaction on pentaerythritol by using 3-mercaptopropionic acid to obtain pentaerythritol tetra (3-mercaptopropionic acid) ester; the preparation method is simple in process, easily available in raw materials, high in added value of products and suitable for industrial production.
Novel synthesis method of pentaerythritol tetra(3-mercaptopropionate)
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Page/Page column 5-7, (2020/01/25)
The invention belongs to the field of chemical technology synthesis, and concretely relates to a synthesis method of pentaerythritol tetra(3-mercaptopropionate). Pentaerythritol reacts with 3-mercaptopropionic acid under the action of a catalyst silicon sulfonic acid to obtain the pentaerythritol tetra(3-mercaptopropionate). The silicon sulfonic acid is adopted as the catalyst, so that the esterification efficiency can be greatly improved, the reaction time is shortened, the energy consumption is reduced, the impurity content of the obtained product is low, and the post-treatment steps are greatly simplified; and the catalyst can be recycled, so the method is suitable for industrial production.
POLYTHIOL COMPOSITION FOR A PLASTIC OPTICAL LENS
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Paragraph 0061; 0062; 0065; 0066, (2020/01/14)
The embodiments relate to a polythiol composition for a plastic optical lens and a polythiourethane-based plastic optical lens prepared therefrom. In the embodiments, a first polythiol compound having an ester group and a mercapto group only as a hydrogen-bondable functional group and a second polythiol compound having an ester group and a hydrogen-bondable functional group other than a mercapto group are used in an appropriate amount. Thus, it is possible to control the viscosity of a polymerizable composition at the initial stage of polymerization at a low temperature of 5 to 15℃ and to stabilize the rate of increase in the viscosity of the composition and the reaction rate thereof, thereby preventing the generation of striae, bubbles, and the like. Further, various plastic lenses such as eyeglass lenses, camera lenses, and the like having excellent appearance characteristics (without striae and bubbles) and excellent optical characteristics can be obtained from the composition.