本文選題：大豆蛋白膠黏劑 + PAE樹脂�。� 參考：《東北林業(yè)大學》2016年碩士論文

【摘要】：隨著人們對居住環(huán)境的要求不斷提高,對于室內(nèi)建筑裝修和家具制造所使用人造材的安全性越來越重視,開發(fā)環(huán)境友好型生物質(zhì)基木材膠黏劑已成為必然趨勢。大豆蛋白作為生物質(zhì)材料的代表,來源廣泛、可再生,可以為制備新型木材膠黏劑提供新方向。由于大豆蛋白的復雜四級結(jié)構(gòu)以及分子量巨大,所制備的大豆蛋白膠黏劑存在固含量低、粘度大、耐水性能及膠合性能差的不足,使實際應用受到很大限制。本文提出以堿降解液化蛋白(D-SPI)、酸熱處理蛋白粉(A-SPI)和聚酰胺多胺環(huán)氧氯丙烷(PAE,作為交聯(lián)改性劑)復配,制備一種固含量較高、粘度較低、膠合性能、耐水性和工藝使用性能優(yōu)良的大豆蛋白膠黏劑,重點就交聯(lián)改性劑的制備與性能優(yōu)化進行研究。本文首先就PAE的合成工藝進行優(yōu)化,采用兩步合成法,先后探究了多胺種類、多胺/己二酸摩爾比、反應溫度、反應時間、環(huán)氧氯丙烷/多胺摩爾比、烷基化工藝以及終止酸的種類和用量(pH值)對所制備PAE性能影響,最終優(yōu)化出了最佳制備工藝：PA中間體合成時,己二酸/二乙烯三胺摩爾比為1：1.05,聚酰胺多胺(PA)中間體制備時先在125℃充分鹽化溶解后,再逐步升溫至185℃下保持2h；烷基化反應時,環(huán)氧氯丙烷與二乙烯三胺的摩爾比為1：1,在35℃保持0.5h后再于50℃C下反應至目標粘度；反應終點時,使用甲酸與硫酸調(diào)節(jié)產(chǎn)品pH值至3.5。此工藝下制備的PAE樹脂性能最優(yōu),在保證體系交聯(lián)程度的同時,盡可能提高環(huán)氧氯丙烷支化程度和陽離子含量,且產(chǎn)品固含量高、儲存期長。將所優(yōu)化的PAE樹脂用于對大豆蛋白膠黏劑的改性,并與其他三種常見改性劑(乙二醛、環(huán)氧樹脂及異氰酸酯)進行對比,結(jié)果證明：PAE樹脂可以很好的提高膠黏劑性能,在膠合強度及耐水性能方面優(yōu)于脲醛樹脂,壓制的膠合板濕強度達到1.12MPa,滿足GB/T17657-1999《人造板及飾面人造板理化性能試驗方法》中對于Ⅰ類膠合板的性能要求,為大豆蛋白膠黏劑在木材加工領域取代醛基類合成膠黏劑提供技術支持。同時,本文還利用傅立葉紅外光譜(FT-IR)、核磁共振分析儀(NMR)、熱重分析儀(TG)、掃描電子顯微鏡(SEM)結(jié)合壓板實驗,對PAE改性大豆蛋白膠黏劑的配方進行了優(yōu)化,并對相關的改性機理進行了探究,結(jié)果證明：PAE中氮雜環(huán)丁烷等活性基團可以與大豆蛋白及木材中的胺基、羥基、羧基發(fā)生反應,使三者固化后形成穩(wěn)定的耐水耐熱性能良好的空間結(jié)構(gòu)；最佳的PAE改性大豆蛋白膠黏劑的配方為D-SPI/A-SPI質(zhì)量比為1：3,PAE添加比例為膠黏劑蛋白含量的30%,以此配方制備的PAE改性大豆蛋白基木材膠黏劑具有最優(yōu)的膠合強度、耐水性和工藝使用性,有望推廣應用。
[Abstract]:With the increasing demand for living environment, more and more attention has been paid to the safety of artificial wood used in indoor building decoration and furniture manufacturing, and the development of environment-friendly biomass-based wood adhesive has become an inevitable trend. Soybean protein, as a representative of biomass materials, can be regenerated from a wide range of sources, which can provide a new direction for the preparation of new wood adhesives. Because of the complex quaternary structure and the huge molecular weight of soybean protein, the prepared soybean protein adhesive has the disadvantages of low solid content, high viscosity, poor water resistance and poor adhesion, so its practical application is greatly limited. In this paper, a high solid content, low viscosity and adhesive properties were prepared by alkali degradation of liquefaction protein (D-SPI), acid-heat treatment protein powder (A-SPI) and polyamide polyamine epichlorohydrin (PAE) as crosslinking modifiers. The preparation and optimization of crosslinking modifier were studied in this paper. In this paper, the synthesis process of PAE was optimized, and the kinds of polyamines, the molar ratio of polyamine to adipic acid, the reaction temperature, the reaction time, the molar ratio of epichlorohydrin and polyamine were investigated. The effects of alkylation process and the type and dosage of the terminated acids on the properties of the PAE were studied. Finally, the optimum preparation process was optimized for the synthesis of the intermediate: PA. The molar ratio of adipic acid to diethylenetriamine is 1: 1.05.The intermediate of polyamide polyamine (PAA) is prepared by fully salinizing and dissolving at 125 鈩，

本文編號：1891654