Synthesis of stabilizing agent with polyamide

Abstract

The invention relates to a method for synthesizing a polyamide stabilizing agent N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,4-phthalic diamide. The method comprises the following steps: enabling dimethyl terephthalate or dimethyl terephthalate and 2,2,6,6-tetramethyl-4-aminopiperidine serving as raw materials to react for 1-2 hours at 190 DEG C without using a solvent or a catalyst; heating to 220-240 DEG C, reacting for 3-6 hours, and directly performing aminolysis to prepare N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,4-phthalic diamide.

Description

technical field [0001] The invention relates to a synthesis method of polyamide stabilizer N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,4-phthalamide (I). (I). Background technique [0002] N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide has been reported as a light stabilizer and processing aid for polyamide ;以下专利报道了其合成方法:EP 1556350( 等同CN 1671664A,CN 1279024C, WO 2004016591A1, US 7632949 ),CN 105481759A,CN 104974075A,CN103554009A, CN 103554009B,CN 103508938A, CN 103508938B,CN 103030588A。 [0003] However, the synthesis and physicochemical properties of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,4-benzenedicarboxamide (I) are hardly reported in the literature, JP 2015224286 , WO 2009144044 (equivalent to DE 102008026075, CN102037080A, CN 102037080B, EP 2128198), WO 2005103345 (equivalent to EP 1738002 US20050239927 CN 1942613A), JP 2000239924 only mentioned N, N'-Double (2,6,6,6,6,6,6,6,6,24 Application description and claims of methyl-4-piperidi...

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Problems solved by technology

[0003] However, the synthesis and physicochemical properties of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,4-benzenedicarboxamide (I) are hardly reported in the literature, JP 2015224286 , WO 2009144044 (equivalent to DE 102008026075, CN102037080A, CN 102037080B, EP 2128198), WO 2005103345 (equivalent to EP 1738002 US20050239927 CN 1942613A), JP 2000239924 only mentioned N, N'-Double (2,6,6,6,6,6,6,6,6,24 Application description and claims of methyl-4-piperidinyl)-1,4-benzenedicarboxamide, but no preparation instructions, no synthesis examples and application examples

[0004] Only JP 1970-2619 (equivalent to DE 2040975, US3684765, GB 1318559 ), Table 3 of Example 3 of US3684765 lists N,N'-bis(2,2,6,6-tetramethyl-4-piperidine base)-1,4-phthalamide (I) for the excellent result data of the anti-aging experiment of polyamide nylon 6; however the above concerns N,N'-bis(2,2,6,6-tetramethyl There are no synthesis instructions and synthesis examples in the patent of -4-piperidinyl)-1,4-benzenedicarboxamide (I); there is no detailed literature report on the physical and chemical properties of the actual test (Scifinder search)

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