共查询到17条相似文献,搜索用时 187 毫秒
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以蜡质玉米淀粉为主要原料、聚乙烯醇(PVA)为保护胶体,在反应过程中加入酸解催化剂[盐酸(HCl)]、氧化剂和引发剂[过硫酸铵(APS)],制得酸解氧化淀粉;然后将其与醋酸乙烯酯(VAc)、丙烯酸乙酯(EA)接枝共聚后,制得新型环保复合淀粉胶粘剂。研究结果表明:采用单因素试验法优选出接枝反应的最佳工艺条件是HCl浓度为2.0 mol/L、V(VAc)=40 mL、V(VAc)∶V(EA)=3∶1、接枝反应温度为70℃、w(淀粉乳液)=20%、w(APS)=1.2%和w(PVA)=40%(均相对于淀粉干基质量而言),此时酸解氧化淀粉胶粘剂在外观、流动性、木材污染性和粘接强度等方面均优于双醛淀粉胶粘剂和PVAc(聚醋酸乙烯酯)白乳胶。 相似文献
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首先用双氧水氧化木薯淀粉,然后用乙酸乙烯酯(VAc)对氧化淀粉进行接枝共聚改性,制备出木薯淀粉基木材胶粘剂。采用单因素试验法考察了木薯淀粉的氧化时间、双氧水掺量、过硫酸铵(APS)掺量以及VAc/木薯淀粉质量比对木薯淀粉基木材胶粘剂剪切强度和黏度的影响。研究结果表明:当氧化时间为1.0 h、V(双氧水)=3 m L、m(APS)=0.3 g和m(VAc)∶m(木薯淀粉)=1.00∶1时,相应的木薯淀粉基木材胶粘剂的粘接性能相对最好,其干态、湿态剪切强度分别为3.25、1.26 MPa。 相似文献
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氧化淀粉基水性胶粘剂的研究 总被引:3,自引:2,他引:1
以过硫酸钾-亚硫酸氢钠(KPS-NaHSO3)为引发剂,在木薯氧化淀粉上接枝苯乙烯(St)和丙烯酸丁酯(BA),并引入功能单体丙烯酸(AA),采用无皂聚合法合成了氧化淀粉基水性胶粘剂。考察了引发剂用量、单体与氧化淀粉配比、单体配比、功能单体用量、聚乙烯醇(PVA)用量和反应温度对胶粘剂性能的影响,并对接枝共聚物进行了红外光谱(FT-IR)表征。实验结果表明,当w(引发剂)=1.8%、m(单体)∶m(氧化淀粉)=3.0∶1、m(St)∶m(BA)=1.75∶1、w(AA)=2.0%和w(PVA)=3%~4%时,所制备的胶粘剂的综合性能最佳,其剥离强度为23.15 N/mm、拉伸强度为0.92 MPa。 相似文献
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丙烯酸系共聚物改性玉米淀粉胶粘剂 总被引:15,自引:2,他引:15
介绍了丙烯酸(AA)-丙烯酰胺(AAm)共聚物改性玉米淀粉胶粘剂的制备方法。研究了聚合反应温度、AA-AAm共聚物、引发剂及淀粉的用量、pH值等各种因素对胶粘剂性能的影响。改性的胶粘剂表现出良好的粘接性能,适用于瓦楞纸箱的生产。 相似文献
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本研究在室温条件下,以玉米淀粉为原料,以次氯酸钠为氧化剂,制备氧化淀粉粘合剂。通过测定粘合剂粘度、初粘力、剥离强度、干燥时间,分析配方中氧化剂次氯酸钠用量对粘合剂性能的影响,寻求最佳次氯酸钠用量以达到较好的性能。粘度是氧化淀粉胶粘剂的主要性能指标,它直接影响纸板的生产质量,而影响粘度的因素主要有氧化剂用量、氧化时间、固含量、氢氧化钠用量、氧化温度等。制备氧化淀粉胶粘剂比较适宜的条件为:氧化剂用量(以淀粉重量%计)20%,在此条件下,固体含量达到16.75%;初粘力达到最大,拉毛面积为99%。 相似文献
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Starch-g-poly(2-methacryloyloxyethyl trimethyl ammonium chloride-co-acrylic acid) (starch-g-P(DMC/AA)) with different zeta potentials was prepared via the graft copolymerization of acid-thinned cornstarch (ATS) with 2-methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acrylic acid (AA) in aqueous medium using Fe2+–H2O2 initiator. The investigation was carried out to reveal the influence of amphoteric branches grafted onto starch chains upon the adhesion of starch to textile fibers. Zeta potential of starch-g-P(DMC/AA) was adjusted by altering the mole ratio of DMC to AA charged into the copolymerization system. The adhesion was evaluated in terms of bonding strength and specific bonding strength of slightly sized roving based on a legal method (FZ/T 15001-2008) through the comparison of the amphoteric branch-grafted starch with ATS, starch-g-PAA, and starch-g-PDMC for warp sizing. It was found that the charged branches grafted onto starch chains were able to significantly enhance the adhesion. Zeta potential, depending on the mole ratio of DMC to AA units in the grafting branches, showed evident effect on the adhesion and desizability of the grafted starch. Increase in the potential favored to improve the adhesion, but disfavored the removal of the starch from sized warps. Alkali-oxidant agent desizing test confirmed that the starch-g-P(DMC/AA) with neutral potential was desizable. The amphoteric branch-grafted starch exhibited potential application as size base materials in warp sizing operation if its zeta potential was neutral. 相似文献