29598-76-3Relevant academic research and scientific papers
Method for synthesizing pentaerythritol tetra (3-lauryl thiopropionate) by one-pot method
-
Paragraph 0023; 0025-0040, (2021/08/21)
The invention provides a method for synthesizing pentaerythritol tetra (3-lauryl thiopropionate) by a one-pot process. The method comprises the following steps: adding a reaction solvent into a reaction container, then sequentially adding pentaerythritol, acrylic acid, triethylamine and catalytic equivalent strong base, heating to 55 DEG C, slowly dropwise adding dodecanethiol, keeping the temperature for 2 hours, slowly dropwise adding a reaction solution in which triphosgene is dissolved, and carrying out heat preservation and stirring for 2 hours after dropwise adding is completed; and after the reaction is finished, washing with water, removing the solvent, and crystallizing and separating to obtain the product. According to the invention, the method has the characteristics of low raw material cost, mild reaction conditions, high reaction speed, simplicity in operation, less pollution and environmental friendliness; and compared with the high-temperature reaction conditions required for synthesizing pentaerythritol tetra (3-lauryl thiopropionate) by a transesterification method or esterification method, the energy consumption is effectively reduced, the production time is shortened, the production efficiency is improved, and the method is suitable for industrial production.
Preparation method of antioxidant 412S pentaerythritol tetra(3-lauryl thiopropionate)
-
Paragraph 0029; 0032-0039; 0042-0049; 0052-0058, (2021/02/10)
The invention provides a preparation method of an antioxidant 412S pentaerythritol tetra(3-lauryl thiopropionate), which comprises the following steps: reacting n-dodecyl mercaptan (NDM) with methyl acrylate (MA) to prepare n-dodecyl thiopropionate, and carrying out transesterification with pentaerythritol to obtain the antioxidant 412S. In the two steps of reactions, a three-coordination boride cationic chloroaluminate ionic liquid is used as a catalyst, the preparation method is suitable for large-scale production of an oxidizing agent 412S, cost saving is realized through effective recoveryand circulation of a solvent, and the whole reaction process is green and environment-friendly through centralized treatment of waste gas and the like.
A four-(3 - dodecyl sulfur generation of propionic acid) pentaerythritol method for preparing an antioxidant (by machine translation)
-
Paragraph 0042-0047, (2018/09/08)
The invention discloses a four-(3 - dodecyl sulfur generation of propionic acid) pentaerythritol method for preparing an antioxidant. This kind of preparation method comprises the following steps: 1) will be an azo compound is can be mixed, heated to 60 °C -85 °C, adding 3 - mercapto propionic acid, stirring reaction; 2) heating up to 100 °C -120 °C, adding pentaerythritol and acidic catalyst mixed solution, mixed reaction; 3) the solid product through the purification reaction, drying, to obtain four (3 - dodecyl sulfur generation of propionic acid) pentaerythritol. This preparation method using the medium acidic catalyst, the advantages that the high reaction activity, good dispersibility, the price is cheap. The reaction technology is moderate, not easily cause equipment corrosion, simple operation, high selectivity catalyst product, product is light in color. At the same time the esterification reaction using a mixed solvent, to pentaerythritol has excellent dissolution effect, to ensure that the reaction has been in a homogeneous system, the reaction efficiency is improved and the product yield. (by machine translation)
Phosphorus-containing compounds, their production and their use as antioxidants
-
, (2008/06/13)
Phosphorus-containing compounds of the formula: STR1 wherein R1 and R2 are each a hydrogen atom or a lower alkyl group, and R3 is a lower alkyl or phenyl group. These compounds may be used as stabilizers against the action of heat, light and oxygen for organic substances and especially polyolefin resins. These phosphorus-containing compounds may be used in conjunction with other stabilizers such phenol-type and sulfur-containing antioxidants, especially in polyolefin resin compositions to produce a polyolefin resin composition having excellent resistance to light, heat and oxygen. The present invention also relates to a method of producing the compounds of the aforementioned formula by reacting STR2 with a disubstituted phosphonate of the formula STR3 wherein R1, R2 and R3 are as defined above.
Stabilizer for synthetic resins
-
, (2008/06/13)
Synthetic resins, particularly polyolefins, are markedly improved in their resistances to heat and oxidation by the incorporation of a 2-methyl-4-t-butyl-5-hydroxyphenylalkanoic acid ester alone or in combination with a thioether-type antioxidant represented by the general formula STR1 wherein R represents an alkyl group of 12 to 20 carbon atoms, or by the general formula STR2 wherein R represents an alkyl group of 4 to 20 carbon atoms.
Process for preparing 3-alkylthiopropionic acid esters
-
, (2008/06/13)
A new process for preparing a polyhydric alcohol 3-alkyl-thiopropionate polyolefin resin stabilizer is provided, in which there is heated a reaction mixture containing a polyhydric alcohol, an alpha-olefin having 6 to 40 carbon atoms, and betamercaptopropionic acid or a lower alkyl betamercaptopropionate in the presence of an organic peroxide or azonitrile reaction initiator, and the polyhydric alcohol 3-alkylthiopropionate polyolefin resin stabilizer is recovered from the mixture. Polyolefin resin compositions stabilized with the stabilizer prepared by the process of this invention, and stabilizer compositions comprising the stabilizer prepared by the process of this invention together with a phenol and/or an alkaline earth metal salt of a monocarboxylic acid are also provided.
