THE ADHESIVE CAPACITY OF STARCH GRAFT COPOLYMERS TO POLYESTER/COTTON FIBER

The advantages of using starch graft copolymers as warp sizes in textile were briefly discussed, and the factors of affecting adhesive capacity to the fiber were analysed. By using eerie ammonium nitrate as an initiator under nitrogen atomosphere, a number of vinyl and/or acrylic monomers such as acrylic acid, acrylamide, methyl acrylate, ethyl acrylate, butyl acrylate, hydroxyethyl acrylate, methyl methacrylate, butyl methacrylate, vinyl acetate and the combinations among them were graft copolymerized respectively onto granular corn starch in aqueous dispersion. The adhesive capacity of these starch graft copolymers to polyester/cotton fibers was evaluated by a slightly sized rovings according to V. K. Aggarwal's method which measures the breaking strength and elongation of the rovings impregnated with the size paste. The influences of the monomers and their combinations, the grafting technological processes and the pretreatment methods before graft copolymerization upon adhesive capacity have been dis     

一种新型淀粉助剂(TH9601)的研究及应用

改性淀粉被广泛应用于造纸表面施胶，对未改性的普通淀粉直接现场改性施胶的过程，进行了研究、探讨和应用，取得了较好的效果，大大提高了纸的表面强度，纸的抗张强度和白度也得到了相应的提高.遇时，由于现场制备，省去了改性淀粉厂的制备过程，降低了成本，提高企业的效益。     

用异淀粉酶改进淀粉膜的研究

用异淀粉酶可使淀粉中的支淀粉脱支而形成链淀粉,从而提高淀粉膜的成膜性能及强度。本文用正交试验法研究异淀粉酶对马铃薯淀粉脱支的作用条件,并描绘了异淀粉酶的作用时间与膜的抗张强度、伸长百分率、耐折度、透湿性、链淀粉含量的关系曲线,为制取性能好的食用淀粉膜提供依据。     

不同品种马铃薯淀粉及其直链淀粉、支链淀粉含量的测定

对甘肃省主要种植马铃薯品种的淀粉含量以及淀粉中直链淀粉和支链淀粉的比例进行了定量分析与比较.结果表明:不同品种马铃薯淀粉中直链淀粉和支链淀粉含量不同,由此造成不同品种马铃薯淀粉性质的差异.     

Starch grain evidence reveals early pottery function cooking plant foods in North China

Early pottery sherds excavated in northern China date back to more than 11,000 cal a BP, and are presumed to have been used as cooking vessels. There has been, however, no direct evidence to demonstrate this function. Here we report ancient starch grains recovered from carbonized residues adhering to the bases of flat- bottomed vessels excavated from the Zhuannian site dating more than 10,000 cal a BP in the North China Plain. This evidence demonstrates that early pottery was being used to cook cereal grains, particularly millets, and acorns. Because millets were in the process of domestication at thistime, we propose that pottery invention in northern China may have been related to early farming activities.     

一种钻井液用改性淀粉类降滤失剂的合成及性能表征

以玉米淀粉(CS)为基体,连续接枝丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)两种单体,合成了CS/AM、CS/AM/AMPS两种降滤失剂,并分别对其降滤失性能进行考察。研究结果发现,在CS和AM的聚合反应中,当反应温度为50,℃,引发剂浓度为单体质量的1.0%,CS与AM的质量比为1∶2,反应时间为3,h时,获得的降滤失剂效果最佳,滤失量为8.6,m L。在此基础上,引入AMPS,通过正交试验,得出钻井液老化后的最佳反应条件。     

马铃薯淀粉渣制取草酸的研究

研究了以马铃薯淀粉渣为原料,采用水解一氧化的方法制取草酸的最佳反应条件：当用硫酸浸泡４ｈ,硝酸／淀粉渣质量比为２．３７—２．４５,氧化反应温度６５－７５℃,反应时间５—６ｈ,草酸二水合物收率＞６５％。该法工艺简单,成本低廉,有较高的经济和社会效益。     

药用植酸钙生产新工艺的研究

提出利用淀粉厂浸泡玉米废水生产药用植酸钙的新工艺。实验确定了最佳操作条件和影响植酸钙收率的主要因素。与传统工艺比较,每吨综合成本降低１６００元     

淀粉接枝型高吸水性树脂的研究——前处理工艺条件对吸水能力的影响

讨论了用过硫酸铵作引发剂,糊化温度与时间以及预氧化温度与时间对淀粉接枝聚丙烯酸高吸水性树脂吸水能力的影响。实验结果表明,前处理工艺条件为：糊化温度８５ ℃,糊化时间２０ ｍｉｎ,预氧化时间１０ ｍｉｎ,预氧化温度７０ ℃。     

新型可生物降解性共聚乳胶仿塑纸品涂料研究

本文研究了以淀粉为原料,苯乙烯为接枝单体,制备新型可生物共聚乳胶仿塑纸品涂料的工艺条件,在常压、６０℃下,用１：１淀粉－苯乙烯,在２０００ｒ／ｍｉｎ下搅拌,控制加料速度,反应８ｈ并采用改性剂改性,所得产品稳定,在纸品上的附着力较高,耐水性能良好。