1999年第二季度国家监督抽查化工产品情况汇总(上)

1999年第二季度国家质量技术监督局组织对工业碳酸钠、工厂用防爆电气产品、悬浮法通用型聚氯乙烯树脂、溶解乙炔、O形橡胶密封圈、橡胶止水带等 6类化工产品进行了监督抽查 ,共抽查了 2 2 8家企业的 2 6 0个产品 ,合格企业 188个 ,合格率 82 .5 % ,合格产品 2 2 0个 ,合格率为 84.6 %。本次抽查大型企业 6 3家 ,合格企业 6 0家 ,合格率为 95 .2 % ;中型企业 75家 ,合格6 9家 ,合格率 92 .0 % ;小型企业 12 2家 ,合格91家 ,合格率 74.6 %。工业碳酸钠产品抽查35家企业的 6 2个产品 ,1家企业和 1个产品不合格 ,产品抽查合格率为 98.4% ;工厂…     

重庆保温材料产品质量合格率85％

为保护消费者合法权益,重庆市质量技术监督局近日对沙坪坝、九龙坡、渝北、南岸、江津、永川等6个区保温材料生产企业的产品进行了抽检,共抽查15家企业的20批次产品,合格17批次,抽样合格率为85％。     

四川省质监局通报二季度农药产品质量专项监督抽查情况

四川省质量技术监督局二季度组织对成都市、资阳市、绵阳市、泸州市、德阳市、宜宾市、眉山市等地区农药生产企业生产的农药产品进行了专项抽查,共抽查41家企业生产的50个批次农药产品,经检验,合格49个批次．抽查批次合格率为98％。较2007年一季度农药产品专项抽查批次合格率提高10％。抽查企业合格率为97．6％。     

6个橡胶助剂产品（增塑剂A）品牌通过质量授信

为提高橡胶增塑剂产品的企业品牌和骨干企业的市场知名度．根据{2011年度橡胶助剂产品（增塑剂A）开展质量授信实施办法》的通知安排，在橡胶助剂专业委员会的统一组织下，经企业申报、抽样检测等相关工作．9月23日，行业专家组专家对天津科迈化工有限公司等7家企业7个产品的申报材料进行了评审，最终6个橡胶助剂产品（增塑剂A）通过质量授信，     

1999年第三季度国家监督抽查化工产品情况汇总

1999年第三季度 ,国家质量技术监督局组织对“工业硫酸、乙草胺乳油等除草剂、农用尿素和橡胶硫化机”4类化工产品进行了监督抽查 ,共抽查了 15 8家企业的 16 1个产品 ,合格企业 15 1家 ,合格率 95 .6 % ;合格产品 15 4个 ,合格率 95 .7%。本次抽查大型企业 46家 ,合格企业 46家 ,合格率 10 0 % ;中型企业 5 7家 ,合格企业5 6家 ,合格率 98.2 % ;小型企业 5 5家 ,合格企业 49家 ,合格率 89.1%。工业硫酸产品抽查 43家企业的 43个产品 ,合格企业及产品43个 ,产品合格率 10 0 % ;乙草胺乳油等除草剂产品抽查 32家企业的 35个产品 ,产品全部合…     

国内外氯产品概况

前言为配合石化部规划院寻找新氯产品科研课题,为“六六六”等产品的减产与淘汰提供取代产品,以解决氯碱平衡,我院干78年6～8月组织了一次国内外氯产品调查,共走访了7个省15个市的34个生产、科研单位及有关部门,并重点查阅了有关的国外资料,但因时间关系,均无作全面普查。因此调查的深度及广度都是很不够的,调查结果仅供参考,有错谬之处,请批评指正。     

质检总局：磨床产品抽样合格率为73．9％

国家质检总局日前对磨床产品的质量抽查显示，产品抽样合格率为73．9％。 本次抽查共涉及天津、上海、江苏、浙江、山东、陕西等6个省、直辖市23家企业生产的23种产品（不涉及出口）。[第一段]     

纯MDI精馏塔生产MDI-50产品质量稳定性研究

纯MDI精馏塔直接生产MDI-50产品保质期仅有3个月,提升其保质期到6个月有极大的经济效益。对MDI-50产品用色谱定性分析,确定浑浊物质组成为二聚体A,B,C等。通过对比实验确定MDI-50中二聚体A饱和溶解度最低,异构体质量分数在65%—70%时二聚体生成速率最低,采出温度越低二聚体生成速率越低,采出停留时间越长二聚体生成速率越快,MDI-50在25—35℃区间二聚体生成速率最低。总结出纯MDI精馏塔生产MDI-50产品采出温度、异构体质量分数、停留时间以及产品储存最佳温度等控制参数,按此参数生产的MDI-50产品保质期提升到6个月。影响MDI-50保质期的主要物质是二聚体,最优的解决方案是将MDI-50初始产品中二聚体质量分数降低至0.1%以下,可以进一步延长保质期到1年。     

绍兴市公布3季度涂料产品监督抽查结果

2014年3季度,绍兴市质量技术监督局组织开展了全市内墙涂料、外墙涂料和油漆产品的质量监督抽查,其中,内墙涂料共抽查了越城区、柯桥区、上虞区、诸暨市、嵊州市和袍江新区等6个地区31家企业的31批次产品,不合格1批次,不合格项目为对比率,     

2001年陶瓷砖产品质量国家监督抽查情况通报

国家建筑卫生陶瓷质量监督检验中心根据国家质量监督检验检疫总局所下达的任务 ,于今年第三季度对陶质砖产品进行了国家监督抽查。本次国家抽查采用由市场和企业抽样的方式 ,在天津塘沽区和武汉市两地的建材市场抽查了 31家经销企业的 31个产品 ,由广东、四川等 2 6家企业抽查了 2 6个产品 ,共抽查了 5 7家企业生产的 5 7个产品。本次抽查覆盖面广 ,共涉及到广东、浙江、福建、四川、上海等 11个省、直辖市 ,所抽查企业包括国有、民营、外资、合资、股份、乡镇、个体等各种经济类型 ,企业规模包括大、中、小型企业 ,所抽产品包括高、中、低…     

Direct pyrolysis mass spectrometry analyses of polyamide‐6 containing melamine and boron compounds

In this work, the thermal degradation characteristics of polyamide 6 (PA6) containing melamine (Me) and a boron‐containing additive, borophosphate (BPO₄), zinc borate (ZnB) or a boron and silicon‐containing oligomer (BSi) are investigated systematically via direct pyrolysis mass spectrometry. In the presence of boron compounds, not only the release of melamine and its degradation products but also thermal characteristics of PA6 are affected significantly and the interactions between melamine and PA6 are enhanced. For the composite involving BPO₄, sublimation of melamine and degradation of PA6 are slightly shifted to high temperatures. Whereas, for the composites involving ZnB and BSi, sublimation of melamine is depressed due to the glassy surface formed by ZnB and BSi and release of thermal degradation products of PA6 are shifted to lower temperatures noticeably. The glassy surface generated by ZnB allows the release of degradation products of melamine to a certain extent. Conversely, for the composite involving BSi, reduction in the yields of degradation products of melamine is also noted. The trap of degradation products of melamine in the polymer matrix causes significant decrease in the the temperature region where thermal degradation products of PA6 are recorded. POLYM. COMPOS. 34:1389–1395, 2013. © 2013 Society of Plastics Engineers     

锌铝镁镀层于3.5%NaCl溶液中腐蚀行为的研究

使用扫描电镜及扫描探针分析了锌铝镁镀层的表面形貌及成分,使用X射线光电子能谱仪及电化学技术分析了锌铝镁镀层腐蚀产物的化学组成、电化学性能,对锌铝镁镀层的耐蚀机制进行了探讨,结果表明:锌铝镁镀层主要由初生锌相、富铝相及共晶组织组成,Mg元素主要分布于共晶组织中。在3.5%NaCl介质腐蚀过程中,锌镀层腐蚀产物主要由Zn₅(CO₃)₂(OH)₆及ZnO组成,锌铝镁镀层腐蚀产物主要由Mg(OH)₂、4MgCO₃·Mg(OH)₂及Zn₅(CO₃)₂(OH)₆组成。锌镀层腐蚀产物电荷传输电阻逐渐降低,而锌铝镁镀层腐蚀产物电荷传输电阻逐渐增大,且后者大于前者。即锌镀层腐蚀产物无法抑制镀层的腐蚀,而锌铝镁镀层腐蚀产物则可以对镀层电化学反应起到抑制作用,对镀层提供一定程度的保护。     

PET纤维的DTY加工工艺与质量管理的探讨

目前,国内涤纶长丝加工的主要工艺路线还是POY→DTY,在DTY加工过程中如何调节生产工艺、搞好生产管理、提高产品质量,始终是摆在我们面前的重要课题。本文从工艺角度讨论了工艺参数设定与质量的宏观控制的关系,并对生产工艺与质量管理提出了一些自己的见解。探讨了FK6M-700型拉伸变形机与FK6C-600型拉伸变形机在工艺调节与质量控制方面的不同。     

六铝酸钙材料及其在铝工业炉中的应用

较系统地介绍了六铝酸钙材料的一些独特优良性能以及六铝酸钙的合成及其制品,同时还阐述了六铝酸钙材料在铝工业中的应用.     

Characterization of side-chain oxidation products of sitosterol and campesterol by chromatographic and spectroscopic methods

Based on the cholesterol-lowering effects of phytosterols, known since the 1950s, extra phytosterol amounts have been added to certain food products for almost 10 yr. Literature reports on oxidation of phytosterols in general are limited, and data on side-chain oxidation of these compounds are scarce. The aim of this study was to investigate and characterize autoxidation products from a mixture of the two phytosterols sitosterol and campesterol. A commercial mixture of the two sterols was oxidized for 72 h at 120°C in an air-ventilated oven. The oxidation products were separated by preparative TLC and identified and characterized with GC-MS. The following oxidation products were identified from the two phytosterols: 24-methylcholest-5-en-3β,24-diol, 24-methylcholest-5-en-3β,25-diol, 24-methylcholest-4-en-6α-ol-3-one, 24-methylcholest-4-en-6β-ol-3-one, 24-ethylcholest-5-en-3β,24-diol, 24-ethylcholest-5-en-3β, 25-diol, 24-ethylcholest-4-en-6α-ol-3-one, 24-ethylcholest-4-en-6β-ol-3-one. Full-scan mass spectra of these compounds are reported for the first time as their trimethylsilyl-ether derivatives.     

Pyrolysis of benzenethiol

Flow pyrolysis of benzenethiol at 700 °C or vacuum pyrolysis of benzenethiol at 800 °C yields benzene, diphenyl sulphide and diphenyl disulphide as the major products. Dibenzothiophene, biphenyl, thianthrene and diphenyl trisulphide are minor products. Co-pyrolysis of benzene-d₆ and natural isotopic abundance benzenethiol yields deuterated and non-deuterated products, indicating that the product-forming sequence is initiated by phenyl radical formation. The phenyl radicals abstract hydrogen atoms from benzenethiol to yield benzene and phenylthio radicals. Coupling of phenylthio radicals yields diphenyl disulphide. Diphenyl sulphide and the minor products are diphenyl disulphide pyrolysis products.     

目前我国化纤市场动态和新产品的开发

1990年我国化纤产量已超过160万t,但产品多为大路货,要加入国际市场竞争,必须调整产品结构。除分析了化纤市场总的情况外,还介绍了聚酯切片及涤纶、腈纶、锦纶、丙纶的市场情况。提出了鼓励开发新产品的建议。     

Phosphonitrilic chloride: 30. Synthesis of chelating polymers from cyclophosphazene derivatives and studies of their electrical conductivity and thermal properties

Chelating polymers containing copper, nickel and cobalt have been formed by reaction of the cyclophosphazene derivatives P₃N₃(NCSNHC₆H₅)₆ or P₃N₃(NCSNHNHC₆H₅)₆ and the corresponding metal ions. The polymers prepared are amorphous solids and insoluble in most organic solvents. The electrical conductivity of the products range from 8.8 × 10⁹ to 1.8 × 10¹⁴ θ-cm. The products are more stable than the corresponding ligand compounds.     

The effect of clay on the thermal degradation of polyamide 6 in polyamide 6/clay nanocomposites

The degradation pathway of polyamide 6/clay nanocomposites was studied as a function of clay content. Well-dispersed polymer-clay nanocomposites can be easily obtained by simple melt blending between organically-modified clays and polyamide 6. Polyamide 6-clay nanocomposites exhibit a large reduction in the peak heat release rate, 60%, measured by cone calorimetry. There are no significant differences in the evolved products during thermal degradation of polyamide 6 and polyamide 6/clay nanocomposites in terms of composition and functionality. The main degradation pathway of polyamide 6 is aminolysis and/or acidolysis, primarily through an intra-chain reaction, producing ε-carprolactam, which is the monomer of polyamide 6. As the clay loading is increased, the relative quantity of ε-carprolactam in the evolved products decreases and the viscosity of the soluble solid residues increases. It is thought that inter-chain reactions become significant in the presence of clay because the degrading polymer chains are trapped in the gallery space of the clay during thermal degradation.     

Action of grignard reagents on 6-(α-styryl)pyridazin-3(2H)-ones; synthesis of some 4-Substituted 6-(α-Styryl)-pyridazin-3(2H)-ones

6(α-Styryl)pyridazin-3(2H)-ones ( 1a – e ) reacted with phenylmagnesium bromide and/or methylmagnesium iodide to give the 1,4-addition products, 4-phenyl and/or 4-methyl-6-(α-styryl)pyridazin-3(2H)-ones ( 3a–e ). The structures assigned to the products are established by electronic and infrared spectroscopy and by synthesis of authentic samples in most cases.