本文主要研究内容
作者秋列维（2019）在《用于纸张增强的多异氰酸酯水分散体系的制备与应用》一文中研究指出：多异氰酸酯是一种具有较高反应活性的物质。异氰酸酯可与含有羟基和氨基类活泼的物质进行反应,因此可将异氰酸酯与富含多聚糖的纸张纤维反应,在纸纤维间形成化学交联,从而提升纸张性能。但因异氰酸酯的高反应活性,导致异氰酸酯在分散和转移过程中容易变质进而减弱甚至失去对纸张性能的提升能力。本课题采用表面活性剂乳化、聚合物分散和端基封端法在分散转移异氰酸酯过程中对异氰酸酯进行保护,并对异氰酸酯的分散效果和保护机制进行了探讨。（1）在表面活性剂乳化分散实验中,利用不同分子量的聚乙二醇单甲醚（mPEG）和六亚甲基二异氰酸酯（HDI）三聚体按照1:1摩尔比反应,制得非离子型表面活性剂EGHT(EG350HT、EG550HT和EG750HT)。采用表面张力法和荧光光谱法确定了表面活性剂EGHT的临界胶束浓度（CMC）。该表面活性剂可用于乳化HDI三聚体（HDIT）。通过测定EGHT/HDIT分散液粒径分布和稳定性分析了EGHT中mPEG相对分子质量和HDIT含量对分散液稳定性的影响。采用甲苯-二丁胺乳化法测试了EGHT/HDIT-2分散液的适用期,其适用期均在7h以内。为了对其工作过程进行分析,采用液氮冷冻干燥技术和扫描电子显微镜（SEM）观察EGHT/HDIT分散液的微观形貌。EGHT/HDIT分散液呈现液核微球结构,液核微球内部是HDIT聚集区,球壁是表面活性剂EGHT,液核微球外部是水相聚集区。该分散液具有对温度的敏感性,可通过升温控制分散液中HDIT释放。EGHT/HDIT分散液可用于纸张增强,液核微球中所包裹的HDIT活性物质,可安全被运移到纸张纤维表面,与纸纤维之间交联形成三维网络结构,从而提高纸张的力学性能。特别是在有聚乙烯醇（PVA）参与的施胶实验中,特种纸的耐折度、抗张指数和撕裂指数分别高达3984次、56.74 N·m/g和8.92mN·m2/g。（2）在两亲共聚物分散实验中,以相对分子质量为300和475聚乙二醇甲基丙烯酸酯（OEGMA）和甲基丙烯酸丁酯（BMA）为单体,通过ATRP反应制得P(OEGMA300-co-BMA)和P(OEGMA475-co-BMA)系列共聚物。利用表面张力法和荧光光谱法确定了共聚物P（OEGMA-co-BMA）的CMC值。通过测定P（OEGMA-co-BMA）水溶液的透光率、黏度和粒径分析了共聚物组成对其低临界溶解温度（LCST）的影响。两亲共聚物P（OEGMA-co-BMA）可用于分散HDIT。通过测定P（OEGMA-co-BMA）/HDIT分散液粒径分布和稳定性分析了共聚物组成以及HDIT含量对分散液稳定性的影响。当共聚物n（OEGMA）:n（BMA）为1.5:1.0,且m（P（OEGMA-co-BMA））:m（HDIT）为1.0:1.5时,P（OEGMA-co-BMA）-3/HDIT-3分散液稳定性好,其适用期在6h以内。为了对其工作过程进行分析,采用液氮冷冻干燥技术和SEM观察P（OEGMA-co-BMA）/HDIT分散液的微观形貌。该分散液呈现多级孔隙海绵体结构。多级孔隙海绵体结构中大孔结构是水相聚集区,多级孔隙海绵体结构中骨架结构是共聚物P（OEGMA-co-BMA）,骨架结构中小孔结构是HDIT的油相聚集区。该分散液具有对温度的敏感性,可通过升温控制分散液中HDIT释放。P（OEGMA-co-BMA）/HDIT分散液可用于纸张增强,与PVA复配形成P（OEGMA-co-BMA）/HDIT/PVA1799复合施胶剂用于特种纸施胶实验中,特种纸的耐折度、抗张指数和撕裂指数分别高达3678次、54.51 N·m/g和8.95 mN·m2/g。（3）采用端基封闭法制备封闭型多异氰酸酯。通过甲基丙烯酸羟乙酯与HDIT反应获得多异氰酸酯丙烯酸单体（HEHT）,将不同质量的HEHT引入至P（OEGMA-co-BMA）中获得系列共聚物P（OEGMA-co-BMA）-b-PHEHT,再通过甲乙酮肟对该共聚物进行封端制备系列封端共聚物P（OEGMA-co-BMA）-b-PHEHT-MEKO。通过粒径分析仪和稳定性分析仪确定出分散稳定性最佳的封端共聚物P（OEGMA-co-BMA）-b-PHEHT-MEKO-2。采用液氮冷冻干燥技术和SEM结合技术观察封端共聚物分散液的微观形貌,该分散液呈现类蜂窝结构。探讨了反应时间和反应温度对封端共聚物分散液微观形貌的影响。发现当分散液和水反应温度升高至90oC时,类蜂窝结构中聚合物骨架结构塌陷,且类蜂窝结构中房孔融合现象加剧。由于该分散液在高温作用下发生解封反应,出现-NCO活性基团,因此可将该分散液作为一种表面施胶剂,应用在纸张增强上。P（OEGMA-co-BMA）-b-PHEHT-MEKO-2分散液具有良好的热稳定性,可与PVA1799共混形成复合施胶剂在高温施胶中使用。当复合施胶剂中封端共聚物分散液质量浓度为0.75%、PVA1799质量浓度为4.0%时,在70℃下施胶,复合施胶液具有良好的热稳定性和较低黏度以及较高的挂胶量。特种纸的耐折度、抗张指数、撕裂指数分别可达4020次、50.03 N·m/g和8.65 mN·m2/g。
Abstract
duo yi qing suan zhi shi yi chong ju you jiao gao fan ying huo xing de wu zhi 。yi qing suan zhi ke yu han you qiang ji he an ji lei huo po de wu zhi jin hang fan ying ,yin ci ke jiang yi qing suan zhi yu fu han duo ju tang de zhi zhang qian wei fan ying ,zai zhi qian wei jian xing cheng hua xue jiao lian ,cong er di sheng zhi zhang xing neng 。dan yin yi qing suan zhi de gao fan ying huo xing ,dao zhi yi qing suan zhi zai fen san he zhuai yi guo cheng zhong rong yi bian zhi jin er jian ruo shen zhi shi qu dui zhi zhang xing neng de di sheng neng li 。ben ke ti cai yong biao mian huo xing ji ru hua 、ju ge wu fen san he duan ji feng duan fa zai fen san zhuai yi yi qing suan zhi guo cheng zhong dui yi qing suan zhi jin hang bao hu ,bing dui yi qing suan zhi de fen san xiao guo he bao hu ji zhi jin hang le tan tao 。（1）zai biao mian huo xing ji ru hua fen san shi yan zhong ,li yong bu tong fen zi liang de ju yi er chun chan jia mi （mPEG）he liu ya jia ji er yi qing suan zhi （HDI）san ju ti an zhao 1:1ma er bi fan ying ,zhi de fei li zi xing biao mian huo xing ji EGHT(EG350HT、EG550HThe EG750HT)。cai yong biao mian zhang li fa he ying guang guang pu fa que ding le biao mian huo xing ji EGHTde lin jie jiao shu nong du （CMC）。gai biao mian huo xing ji ke yong yu ru hua HDIsan ju ti （HDIT）。tong guo ce ding EGHT/HDITfen san ye li jing fen bu he wen ding xing fen xi le EGHTzhong mPEGxiang dui fen zi zhi liang he HDIThan liang dui fen san ye wen ding xing de ying xiang 。cai yong jia ben -er ding an ru hua fa ce shi le EGHT/HDIT-2fen san ye de kuo yong ji ,ji kuo yong ji jun zai 7hyi nei 。wei le dui ji gong zuo guo cheng jin hang fen xi ,cai yong ye dan leng dong gan zao ji shu he sao miao dian zi xian wei jing （SEM）guan cha EGHT/HDITfen san ye de wei guan xing mao 。EGHT/HDITfen san ye cheng xian ye he wei qiu jie gou ,ye he wei qiu nei bu shi HDITju ji ou ,qiu bi shi biao mian huo xing ji EGHT,ye he wei qiu wai bu shi shui xiang ju ji ou 。gai fen san ye ju you dui wen du de min gan xing ,ke tong guo sheng wen kong zhi fen san ye zhong HDITshi fang 。EGHT/HDITfen san ye ke yong yu zhi zhang zeng jiang ,ye he wei qiu zhong suo bao guo de HDIThuo xing wu zhi ,ke an quan bei yun yi dao zhi zhang qian wei biao mian ,yu zhi qian wei zhi jian jiao lian xing cheng san wei wang lao jie gou ,cong er di gao zhi zhang de li xue xing neng 。te bie shi zai you ju yi xi chun （PVA）can yu de shi jiao shi yan zhong ,te chong zhi de nai she du 、kang zhang zhi shu he si lie zhi shu fen bie gao da 3984ci 、56.74 N·m/ghe 8.92mN·m2/g。（2）zai liang qin gong ju wu fen san shi yan zhong ,yi xiang dui fen zi zhi liang wei 300he 475ju yi er chun jia ji bing xi suan zhi （OEGMA）he jia ji bing xi suan ding zhi （BMA）wei chan ti ,tong guo ATRPfan ying zhi de P(OEGMA300-co-BMA)he P(OEGMA475-co-BMA)ji lie gong ju wu 。li yong biao mian zhang li fa he ying guang guang pu fa que ding le gong ju wu P（OEGMA-co-BMA）de CMCzhi 。tong guo ce ding P（OEGMA-co-BMA）shui rong ye de tou guang lv 、nian du he li jing fen xi le gong ju wu zu cheng dui ji di lin jie rong jie wen du （LCST）de ying xiang 。liang qin gong ju wu P（OEGMA-co-BMA）ke yong yu fen san HDIT。tong guo ce ding P（OEGMA-co-BMA）/HDITfen san ye li jing fen bu he wen ding xing fen xi le gong ju wu zu cheng yi ji HDIThan liang dui fen san ye wen ding xing de ying xiang 。dang gong ju wu n（OEGMA）:n（BMA）wei 1.5:1.0,ju m（P（OEGMA-co-BMA））:m（HDIT）wei 1.0:1.5shi ,P（OEGMA-co-BMA）-3/HDIT-3fen san ye wen ding xing hao ,ji kuo yong ji zai 6hyi nei 。wei le dui ji gong zuo guo cheng jin hang fen xi ,cai yong ye dan leng dong gan zao ji shu he SEMguan cha P（OEGMA-co-BMA）/HDITfen san ye de wei guan xing mao 。gai fen san ye cheng xian duo ji kong xi hai mian ti jie gou 。duo ji kong xi hai mian ti jie gou zhong da kong jie gou shi shui xiang ju ji ou ,duo ji kong xi hai mian ti jie gou zhong gu jia jie gou shi gong ju wu P（OEGMA-co-BMA）,gu jia jie gou zhong xiao kong jie gou shi HDITde you xiang ju ji ou 。gai fen san ye ju you dui wen du de min gan xing ,ke tong guo sheng wen kong zhi fen san ye zhong HDITshi fang 。P（OEGMA-co-BMA）/HDITfen san ye ke yong yu zhi zhang zeng jiang ,yu PVAfu pei xing cheng P（OEGMA-co-BMA）/HDIT/PVA1799fu ge shi jiao ji yong yu te chong zhi shi jiao shi yan zhong ,te chong zhi de nai she du 、kang zhang zhi shu he si lie zhi shu fen bie gao da 3678ci 、54.51 N·m/ghe 8.95 mN·m2/g。（3）cai yong duan ji feng bi fa zhi bei feng bi xing duo yi qing suan zhi 。tong guo jia ji bing xi suan qiang yi zhi yu HDITfan ying huo de duo yi qing suan zhi bing xi suan chan ti （HEHT）,jiang bu tong zhi liang de HEHTyin ru zhi P（OEGMA-co-BMA）zhong huo de ji lie gong ju wu P（OEGMA-co-BMA）-b-PHEHT,zai tong guo jia yi tong wo dui gai gong ju wu jin hang feng duan zhi bei ji lie feng duan gong ju wu P（OEGMA-co-BMA）-b-PHEHT-MEKO。tong guo li jing fen xi yi he wen ding xing fen xi yi que ding chu fen san wen ding xing zui jia de feng duan gong ju wu P（OEGMA-co-BMA）-b-PHEHT-MEKO-2。cai yong ye dan leng dong gan zao ji shu he SEMjie ge ji shu guan cha feng duan gong ju wu fen san ye de wei guan xing mao ,gai fen san ye cheng xian lei feng wo jie gou 。tan tao le fan ying shi jian he fan ying wen du dui feng duan gong ju wu fen san ye wei guan xing mao de ying xiang 。fa xian dang fen san ye he shui fan ying wen du sheng gao zhi 90oCshi ,lei feng wo jie gou zhong ju ge wu gu jia jie gou ta xian ,ju lei feng wo jie gou zhong fang kong rong ge xian xiang jia ju 。you yu gai fen san ye zai gao wen zuo yong xia fa sheng jie feng fan ying ,chu xian -NCOhuo xing ji tuan ,yin ci ke jiang gai fen san ye zuo wei yi chong biao mian shi jiao ji ,ying yong zai zhi zhang zeng jiang shang 。P（OEGMA-co-BMA）-b-PHEHT-MEKO-2fen san ye ju you liang hao de re wen ding xing ,ke yu PVA1799gong hun xing cheng fu ge shi jiao ji zai gao wen shi jiao zhong shi yong 。dang fu ge shi jiao ji zhong feng duan gong ju wu fen san ye zhi liang nong du wei 0.75%、PVA1799zhi liang nong du wei 4.0%shi ,zai 70℃xia shi jiao ,fu ge shi jiao ye ju you liang hao de re wen ding xing he jiao di nian du yi ji jiao gao de gua jiao liang 。te chong zhi de nai she du 、kang zhang zhi shu 、si lie zhi shu fen bie ke da 4020ci 、50.03 N·m/ghe 8.65 mN·m2/g。
论文参考文献
论文详细介绍
论文作者分别是来自陕西科技大学的秋列维，发表于刊物陕西科技大学2019-07-15论文，是一篇关于纸张施胶剂论文,多异氰酸酯论文,增强作用论文,分散机理论文,微观结构论文,陕西科技大学2019-07-15论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自陕西科技大学2019-07-15论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：纸张施胶剂论文; 多异氰酸酯论文; 增强作用论文; 分散机理论文; 微观结构论文; 陕西科技大学2019-07-15论文;