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.
Preparation method of high-content pentaerythritol tetra (3-mercaptopropionic acid) ester
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Paragraph 0021-0041, (2020/03/17)
The invention belongs to the field of chemical industry, and particularly relates to a preparation method of high-content pentaerythritol tetra (3-mercaptopropionic acid) ester, and the method comprises the following steps: reacting pentaerythritol, mercaptopropionic acid and an acylating reagent as raw material and organic alkali as a catalyst in a certain solvent at a certain temperature, and finally carrying out alkali washing, acid washing, water washing and negative pressure solvent recovery to obtain the target product. The preparation method disclosed by the invention has the advantagesof high reaction rate, low product chromaticity, small smell, high main content and the like.
POLYTHIOL COMPOSITION FOR A PLASTIC OPTICAL LENS
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Paragraph 0061; 0062; 0067; 0068, (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.