本文選題：環(huán)化SBS + α-蒎烯樹脂　； 參考：《江南大學》2015年碩士論文

【摘要】：氧氣是引起食品腐壞變質的重要因素之一,它能夠引起食品氧化、細菌繁殖從而導致食品變味、變色以及營養(yǎng)物質流失,因此食品包裝內氧氣的含量必須低于其允許值。降低食品包裝內氧氣含量的傳統(tǒng)方法有氣調包裝和真空包裝,但是這兩種方法均不能完全除去包裝內的氧氣,包裝內部仍然會有微量的氧氣殘留。吸氧包裝克服了這兩種包裝方法除氧不徹底的缺點,能夠主動清除包裝內部的氧氣。吸氧包裝材料研究的核心內容是活性吸氧物質的研究。本課題以苯乙烯-丁二烯共聚物(SBS)為原料,經環(huán)化反應制備環(huán)化SBS,與引發(fā)劑、過渡金屬催化劑共混制備吸氧環(huán)化SBS共混物。將吸氧環(huán)化SBS共混物與α-蒎烯樹脂共混制備吸氧環(huán)化SBS-α-蒎烯樹脂共混物。利用制備的兩種吸氧共混物與基材共混物制備吸氧單層膜。主要研究內容和研究成果如下:(1)采用正交試驗設計,以吸氧性能為考察指標,對影響環(huán)化SBS吸氧共混物吸氧性能的關鍵因素進行優(yōu)化,確定制備環(huán)化SBS吸氧共混物的優(yōu)化工藝條件:SBS的濃度20%,對甲苯磺酸的用量2%,反應溫度75℃,反應時間3h,在該條件下的制備的環(huán)化SBS吸氧共混物的吸氧能力達40.5 m L/g,吸氧速率為0.129 m L?g-1?cm-2?d-1。研究貯藏條件對環(huán)化SBS吸氧共混物吸氧性能的影響,結果表明,隨著貯存時間的延長以及貯存溫度的升高,吸氧共混物的吸氧性能有所降低,而貯存濕度對于吸氧共混物的吸氧性能影響不顯著。(2)考察α-蒎烯樹脂的添加量對環(huán)化SBS-α-蒎烯吸氧樹脂共混物吸氧性能的影響,結果表明,當α-蒎烯樹脂的添加量為15%時,吸氧樹脂共混物在23℃、4℃條件下達到的最大吸氧量分別為36.2 m L/g、35.6 m L/g。另外,在貯存過程中,環(huán)化SBS-α-蒎烯吸氧樹脂共混物的吸氧性能有一定程度的降低,但其吸氧性能降低的幅度會隨著貯存時間延長或貯存溫度的繼續(xù)升高而減弱。(3)制備分別以環(huán)化SBS吸氧共混物及環(huán)化SBS-α-蒎烯吸氧共混物為活性吸氧物質的吸氧LDPE膜,考察吸氧共混物的添加量對吸氧LDPE膜吸氧性能、阻隔性能、物理力學性能等的影響。結果表明,所制備的吸氧LDPE達到了預期的吸氧性能,且吸氧效果不會隨著貯存時間的延長而發(fā)生明顯變化;另外,添加吸氧物質后,LDPE仍具有熱封性能,且與純LDPE膜相比,吸氧LDPE膜的熱封強度變化不顯著;但是吸氧共混物的添加會在一定程度上削弱吸氧薄膜的力學性能和阻隔性能。
[Abstract]:Oxygen is one of the important factors that cause food decay and deterioration. It can cause food oxidation, bacterial reproduction, resulting in food flavor, color change and loss of nutrients. Therefore, the content of oxygen in food packaging must be lower than its allowable value. The traditional methods to reduce the oxygen content in food packaging are atmosphere controlled packaging and vacuum packaging. However, these two methods can not completely remove the oxygen in the packaging, and there will still be trace oxygen residues in the packaging. Oxygen-absorbing packaging overcomes the shortcoming of incomplete deoxygenation and can remove the oxygen inside the package on its own initiative. The core of the research on oxygen absorbing packaging materials is the study of active oxygen absorbing materials. In this paper, styrene butadiene copolymers (SBSs) were used as raw materials to prepare cyclized SBSs by cyclization and blending with initiators and transition metal catalysts to prepare oxygen adsorbent cyclized SBS blends. SBS- 偽 -pinene resin blend was prepared by blending the oxygen-absorbing cyclized SBS blends with 偽 -pinene resin. Oxygen absorbing monolayer films were prepared from two kinds of oxygen absorbing blends and substrates. The main research contents and results are as follows: (1) the key factors affecting the oxygen absorption of cyclized SBS blends were optimized by using the orthogonal test design and the oxygen absorption performance as an index. The optimum process conditions for the preparation of cyclized SBS blends were determined. The concentration of 20% SBS and the dosage of p-toluenesulfonic acid were determined. The reaction temperature was 75 鈩，

本文編號：1964034