- Preparation method of double-terminal amino type hydrophilic chain extender
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The invention discloses a preparation method of a double-terminal amino type hydrophilic chain extender. The method comprises the following steps: dissolving ethylenediamine in a solvent, dispersing, controlling the temperature of a system, dropwise adding 1, 3-propane sultone into the system, controlling the dropwise adding speed, keeping the temperature of the system, controlling the dropwise adding time to be 2-4 hours, and controlling the later aging time to be 2-5 hours; after a secondary amine value and a total amine value of a sample are monitored through central control sampling, adding alkali to carry out an acid-base reaction on a sulfonic acid part of the sample, regulating the pH to a proper range, removing a solvent existing in a system under reduced pressure, and finally adding water to adjust the solid content to a proper range, so that a double-terminal amino type hydrophilic chain extender aqueous solution can be obtained. The invention provides a preparation method of a double-terminal amino type hydrophilic chain extender similar to ethylenediamine esilate in structure and property; wherein the ring-opening reaction and selectivity of 1,3-propane sultone are utilized, and selective synthesis is carried out in an aqueous solution; the synthesis process is simple, a large number of organic solvents are not needed, a complicated post-treatment process is not needed, the preparation method is green and environment-friendly, and the industrialization degree is high.
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Paragraph 0013; 0028-0031; 0033-0036; 0039-0042; 0045-0048
(2021/07/21)
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- Amino-phosphonic-sulfonic acids
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This invention relates to compounds characterized by the presence of N-methyl, or substituted methyl, phosphonic acid and N-propylenesulfonic acid groups. These compounds contain at least one or more of each group and are bonded to the same or different amino groups. They are derived by reacting an amine with both propane sultone and with a carbonyl compound, such as formaldehyde, and phosphorous acid or its equivalent. They have a wide variety of uses, for example as scale and corrosion inhibitors, chelating agents, etc.
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