新型受阻胺类光返黄抑制剂的合成及在竹子化机浆中的应用

Synthesis of Novel Hindered Amine Photo-yellowing Inhibitor and Its Application in Bambusa Chungii BCTMP Pulp

以己二胺哌啶（HMBTAD）为原料合成了新型受阻胺类光返黄抑制剂——己二胺哌啶氮氧自由基（HMB—TEMPO），详细研究了合成过程中的各种影响因素以及HMB—TEMPO在粉单竹BCTMP中的应用。最佳合成工艺条件为：以乙醇为溶剂，H2O2与HMB—TAD摩尔比为4．0：1，温度70℃，反应总时间10h，其中H2O2滴漏时间3～4h，催化剂Mg（OH）2用量为1．0％，产率达91％以上。与外购商品返黄抑制剂4-OH—TEMPO的对比实验表明，HMB—TEMPO具有较好的性质和返黄抑制效果，更适合竹子化机浆的光诱导返黄抑制。

In this paper, the controlling factors for the synthesis of the novel hindered amine photo-yellowing inhibitor N, N＇-bis （2,2,6,6 - tetramethyl-piperidinyloxy） -1,6-hexandiamine （ HMB -TEMPO） by oxidizing N, N＇-bis （ 2,2,6,6 -tetramethyl -piperidinyl） -1,6- hexandiamine （HMBTAD） and its application in Bambusa Chungii （bamboo） BCTMP were studied. The optimal conditions of synthesis are as follows： ethanol as solvent, n（H2O2 ）：n（HMBTAD） =4.0： 1; reaction temperature 70℃; totally reaction time 10 h, including 3 -4 h of dropping time of H2O2, charge of Mg（OH） 2 as catalyst 1.0% , the yield of the product is over 91%. The results showed that HMB-TEMPO has much better properties than 4-OH-TEMPO, and is more suitable for Bambusa Chungii BCTMP as light-induced yellowing inhibitor.