单宁胶用PUF树脂的制备工艺与结构和交联性能关系的研究

提出了一种单宁胶用ＰＵＦ树脂的制备方法。用＾１３ＣＮＭＲ研究了制备条件对ＰＵＦ树脂组分、结构和交联性能的影响。压板试验表明ＰＵＦ树脂配制单宁胶时，只有折合甲醛值大于１０％，压制的胶合板才能符合室外级板的强度要求。用ＤＳＣ研究了固化温度对该单宁胶固化程度的影响。     

ZL胶粉聚苯颗粒外保温施工技术--哈尔滨威德自动化焊接有限公司联合厂房施工实例

本文结合工程实践介绍了ZL胶粉聚苯颗粒外保温在高寒地区的施工方法和要点,并阐述了在高寒地区推广的可行性.     

绿肥轮作还田对稻田土壤溶液氮素变化及水稻产量的影响

通过研究利用绿肥等改变轮作制度及N素管理后稻田土壤溶液中溶解性N素的动态变化及水稻产量的变化,评价了利用绿肥参与水稻轮作系统,减少无机N肥的施用量,促进水稻生长的同时降低环境负荷的可行性。研究表明,在总N量相当的情况下,冬绿肥还田或冬季休闲稻季土壤溶液中NH4 -N浓度均比稻麦轮作单施化肥的处理低。溶液NO3--N浓度随还田有机物料的C/N增加显著降低。利用豆科紫云英轮作还田,可降低44％的无机N肥用量,溶解性N浓度显著降低,是减小稻季N肥流失环境风险的有效途径。     

水分管理对太湖地区水稻土无机磷转化的影响

采用中性土无机磷分级方法,研究不同水肥条件下水稻土无机磷动态变化及其影响因素,结果表明:施磷处理明显提高了各形态无机磷含量,在淹水培育条件下,Ca2-P、Ca8-P、Al-P逐步降低,Fe-P、Oc-P呈增高趋势,Ca10-P基本保持稳定;各种形态的磷在60%田间持水量培育下变化类似。总体而言,土壤培育增加了对磷的固定作用,且MNK、MNPK、CNPK处理较C0和CNK效果更明显。培育期内土壤晶质铁、络合铁及无定形铁含量的变化符合土壤无机磷转化的部分机制,至于还原铁在淹水条件下如何再次氧化而导致磷的二次固定需要进一步研究。     

稻秸/淀粉胶复合材料性能研究

为充分利用农作物废弃物,研究环境友好材料,通过热压成型方法制备稻秸/淀粉胶全降解复合材料。研究了预处理、胶黏剂、增塑剂和阻湿剂含量对复合材料内结合强度(IB)、弯曲强度(FS)、弯曲弹性模量(MOE)、冲击韧性(IR)、拉伸强度(TS)、拉伸模量(MOR)、含水率及2h吸水厚度膨胀率的影响,并观察了复合材料细观表面。结果表明:水热处理复合材料力学性能除IB外均较高;含胶量为10%时力学性能除MOR外均较高;1%增塑剂提高了IB、FS及TS,2%增塑剂提高了IS,增塑剂对MOE和MOR有负面影响;阻湿剂降低了复合材料力学性能。增塑剂、阻湿剂均能不同程度的增大复合材料MC。复合材料2h吸水厚度膨胀率大,防水性能差。复合材料基体和增强体两相界面结合存在明显缝隙、空洞及分层现象。     

澳格利茶叶缓控释肥施用效果初报

田间对比试验表明,施用澳格利茶叶缓控释肥处理,比施用等养分俄罗斯进口复合肥处理,茶树生长量均有增加,其中树宽、新梢长和每株着新梢数的差异达到极显著或显著标准;春茶鲜叶测产,每667m^2的单产增产40．51％,达极显著水准;茶叶硒、锌和氨基酸含量增加。     

饼肥与无机氮肥配施对水稻根系形态生理和产量的影响

以扬稻6号(籼稻)和扬辐粳8号(粳稻)为材料,设置4个处理:(T1)不施氮肥;(T2)施用无机氮;(T3)施用饼肥;(T4)饼肥与无机氮肥配施.研究饼肥与无机氮肥配施对水稻根系形态生理和产量形成的影响.结果表明:各处理的产量表现为饼肥与无机氮肥配施(T4)＞施用无机氮(T2)＞施用饼肥(T3)＞不施氮肥(T1),4个处理间差异显著.饼肥与无机氮肥配施(T4)显著增加了穗数、结实率、千粒重和收获指数.饼肥与无机氮肥配施(T4)显著提高了抽穗期有效叶面积和高效叶面积、灌浆期叶片叶绿素含量和光合速率以及各主要生育时期的根干重、根长、根系氧化力、根系伤流量、根系总吸收表面积和活跃吸收表面积.表明饼肥与无机氮肥配施可以促进根部生长,进而促进地上部生长并提高产量.     

多层压机生产线生产E1级刨花板的生产工艺

介绍了国产多层压机生产线生产E1级刨花板的方法,阐述了胶黏剂制胶、施加、热压工艺的调整方法。     

植物蛋白胶细木工板加工技术的研究

笔者使用的植物蛋白胶是以富含蛋白质的生物质为主要原料制备的无甲醛释放的胶粘剂。由于其初粘性不如"三醛胶"大,因此不能利用传统细木工板的生产工艺。针对该胶粘剂的特点,通过研究新的施胶工艺,确定木材含水率8%～12%,第1次预压15 min,热压第一阶段最佳工艺参数:施胶量170 g/m2,热压时间8 min,压力17 MPa,温度105℃;第2次预压15 min,热压第二阶段最佳工艺参数:施胶量155 g/m2,热压时间4 min,施胶量155 g/m2,温度100℃,压力15 MPa,板材外观能达到优等品标准,理化性能符合GB/T5849-2006的要求。     

Polyurethane Adhesive Ingestion

Polyurethane adhesives are found in a large number of household products in the United States and are used for a variety of purposes. Several brands of these expanding wood glues (those containing diphenylmethane diisocyanate [MDI]) have the potential to form gastrointestinal (GI) foreign bodies if ingested. The ingested adhesive forms an expanding ball of glue in the esophagus and gastric lumen. This expansion is caused by a polymerization reaction using the heat, water, and gastric acids of the stomach. A firm mass is created that can be 4-8 times its original volume. As little as 2 oz of glue have been reported to develop gastric foreign bodies. The obstructive mass is reported to form within minutes of ingestion of the adhesive. The foreign body can lead to esophageal impaction and obstruction, airway obstruction, gastric outflow obstruction, mucosal hemorrhage, ulceration, laceration, perforation of the esophageal and gastric linings, and death. Clinical signs following ingestion include anorexia, lethargy, vomiting, tachypnea, and abdominal distention and pain, and typically develop within 12 hours. Clinical signs may depend upon the size of the mass. If left untreated, perforation and rupture of the esophagus or stomach can occur. The glue mass does not stick to the GI mucosa and is not always detectable on abdominal palpation. Radiographs are recommended to confirm the presence of the “glue-ball” foreign body, and radiographic evidence of the obstruction may be seen as early as 4-6 hours following ingestion. Emesis is contraindicated owing to the risk of aspiration of the glue into the respiratory tree or the subsequent lodging of the expanding glue mass in the esophagus. Likewise, efforts to dilute the glue and prevent the formation of the foreign body through administration of liquids, activated charcoal, or bulk-forming products to push the foreign body through the GI tract have proven ineffective. Even endoscopy performed to remove the foreign body has been shown to be unreliable. The safest, most effective, and successful therapy is surgical intervention to remove the GI foreign body. If performed early enough, complete recovery of the animal can be expected. Differential diagnoses for polyurethane adhesive ingestion include any potential cause of GI obstruction. The public is largely unaware of the hazards that ingestion of this product may produce. Public education efforts are needed to inform pet owners about the hazards of these glues and the overall importance of providing our companion animals with safe, poison-free environments.