密胺树脂改性酪素皮革顶涂剂的合成与应用

通过密胺树脂的羟甲基(-CH2OH)与酪素中的氨基(-NH2)、亚氨基(-NH-)、羟基(-OH)、羧基(-COOH)缩合交联,提高酪素的耐水、耐磨、耐碰擦等综合性能.并对密胺树脂改性酪素的机理及应用进行探讨,从而提出了一种新的有价值的酪素改性方法.     

羟甲基丙烯酸树脂改性酪素皮革顶涂剂合成与应用的探讨

通过羟甲现烯酸树脂与酪素中的氨基，亚氨基，羧式，羟基缩合并联，提高酪素成像的耐曲挠，耐水等综合理化性能。并对羟甲基丙烯酸树脂改性酪素的改性机理及其应用进行了探讨。从而提出了一种最新最有价值的酪素改性方法。     

有机硅改性酪素皮革涂饰剂的合成与应用

本文提出了用含端基氮丙环(-N CH2 CH2）的有机硅氧烷与酪素结构中的氨基(-NH2)、羧基(-COOH)反应，提高改性酪素的耐水、耐曲挠、耐摩擦等综合性能的新方法，该改性产品在多种鞋面革中进行了涂饰实验。     

有机硅改性酪素皮革涂饰剂的合成与应用

本文提出了用含端基氮丙环(-NCH2CH2)的有机硅氧烷与酪素结构中的氨基(-NH2)、羧基(-COOH)反应,提高改性酪素的耐水、耐曲挠、耐摩擦等综合性能的新方法,该改性产品在多种鞋面革中进行了涂饰实验.     

紫外光固化密胺树脂的合成及涂层织物性能测试

采用丙烯酸羟乙酯(HEA)改性甲醚化密胺树脂(HMMM),引入了不饱和C=C双键,增加密胺树脂的光固化性能,成功合成了氨基丙烯酸酯(HEA-MF),制备得到紫外光(UV)固化密胺树脂,并利用红外光谱分析了产物的结构;制备了光固化密胺树脂膜和涂层织物,借助热重分析仪表征膜的热性能,并对涂层织物的力学性能、硬挺度、耐磨性、防水透湿性和透气性等进行分析。结果表明:在300 ℃以下,光固化膜结构稳定,具有较好的热稳定性,350 ℃质量开始快速减少;涂层后织物断裂强力、硬挺度和耐磨性均提高,织物断裂伸长率和透湿透气性有所下降,但涂层织物防水性能突出。     

改性密胺树脂-纤维素复合纤维制备及性能

以再生纤维素纤维为基体,MS-200型钛酸酯偶联剂改性密胺树脂为功能性添加助剂,制备改性密胺树脂-纤维素复合纤维。介绍MS-200型钛酸酯偶联剂改性密胺树脂的制备方法,并对改性密胺树脂-纤维素复合纤维的形态结构、热学性能、阻燃性能以及物理机械性能进行测试分析。结果表明:MS-200型钛酸酯偶联剂改性密胺树脂-纤维素复合纤维的截面形态与普通纤维素纤维类似,改性密胺树脂在纤维横截面中均匀分布;与普通纤维素纤维相比,改性密胺树脂-纤维素复合纤维的热稳定性有所下降,但残碳率增加,极限氧指数升高,干断裂强度和湿断裂强度都有提升,但纤维中改性密胺树脂的流失量较大,干态下断裂伸长率下降。     

有机硅改性聚合物在皮化材料中的应用

介绍了国内外有机硅改性丙烯酸树脂、有机硅改性聚氨酯、有机硅改性硝化棉、有机硅改性酪素等在皮化材料中的发展及应用情况。     

普通皮衣翻新上色配比

品　　名用量 (份 )主　要　成　分作　　　　用备　　　注浆膏有酪浆膏 1 0 0颜料、酪素、硫化油主要起遮盖作用 ,有成膜性无酪膏 (进口 ) 2 0高分散颜料 遮盖力极强、涂层薄、手感好、亮度稍低二者任选一种树脂丙烯酸树脂1 0 0～ 1 1 0主要起成膜及粘合作用 ,软硬搭配不粘为宜聚氨酯树脂1 0 0～ 1 1 0主要起成膜及粘合作用 ,分子细小 ,手感丰满柔软二者一起使用酪龙 3～ 5酪素的改性物 增加粘合牢度 ,增光、固色 ,多使皮衣会变硬成膜较酪素液软手感剂 3～ 5 (如加滑爽剂可不加手感剂 ) 硅蜡型溶液 具有硅的软度、滑度、蜡感及丝光感适用顶…     

明胶改性作蛋白涂饰剂的研究

本文用半互穿网络（ＨＩＰＮ）新技术和接枝改性技术对明胶进行了改性，获得了抗冻融性优良、既能代替酪素、又能代替部份丙烯酸树脂的皮革涂饰材料。     

酪素的改性及改性产品的性能

本文选用不同的单体及配比对酪素进行了改性。研究了反应条件、单体种类和单体的配比对改性产品的质量影响。同时，对改性酪素的成膜性能、涂饰应用性能进行了研究。结果表明：通过对酪素改性，提高了其成膜性能，得到了软性和硬性酪素产品。改性酪素应用于猪服装革的涂饰，涂层耐干、湿擦及耐折牢度均达到要求。     

新型阻燃性三聚氰胺树脂鞣剂的合成、性能及应用

以氧氯化磷、季戊四醇和三聚氰胺为原料 ,合成 2 ,2 -羟甲基 - 1,3-丙二基双磷酸二氰酯三聚氰胺盐 ,并通过正交优化试验对其合成工艺进行了研究。经熔点、元素分析和红外光谱 ,初步确认了其分子结构。采用甲醛和助剂对其改性 ,获得了无色透明、稳定性好、水溶性好 ,既具有高效阻燃性又具有良好的复鞣填充性能的新型皮革多功能三聚氰胺树脂鞣剂产品。对于它在皮革上的应用性能、阻燃机理和鞣革作用机理进行了初步研究。季戊四醇二氢酯羟甲基化三聚氰胺树脂鞣剂 ,在皮革上的应用研究是一项全新的探索。     

Artificial weathering of wood surfaces modified by melamine formaldehyde resins

Spruce and poplar samples were treated with different melamine formaldehyde resins. A long term artificial weathering experiment was performed in order to clarify the resistance to weathering regarding wood colour and surface hardness. The increase in hardness due to melamine treatment was well preserved after simulated long term weathering. The treated samples also showed advantages compared to untreated reference samples regarding discolouration and crack formation. Low molar mass and low degree of methylolation of the melamine resin used was found to be favourable for a successful treatment.     

Herstellung von Spanplatten mit verstärkten Aminoplast-Leimharzen

Pure urea resins may be reinforced with melamine, phenole and isocyanate to provide any required glue quality. This paper shows how the modification of urea resins with melamine affects the durability of boards. A supplementary reinforcement with phenole in form of a compound condensation product increases the weathering resistance of the internal bond. Similar to the modification with phenole, the stability and weathering resistance of boards is improved in a combination of aminoplast glues with isocyanate (MDI). The amount required and the kind of reinforcement used are definitely affected by production conditions and specified board quality.     

聚氨酯改性酪素皮革涂饰剂的制备与应用

本文提出了NaHSO3封闭-NCO基的聚氨酯改性酪素皮革涂饰剂。在加热过程中,热解闭聚氨酯释放出-NCO基与酪素中的活泼氢反应,显著地提高了酪素的耐水性、耐曲挠性,并在多种鞋面革中进行了应用试验。     

聚氨酯改性酪素的研究

本论文叙述了用聚氨酯对酪素进行接枝改性的研究。采用正交试验法研究了各反应因素对接枝共聚反应的影响,找出了较为理想的合成工艺。测定了接枝效率,并用红外光谱验证了反应的发生,浅析了反应机理。以酪素,及礤改性产品进行了对比涂饰试验,结果表明该改性酪素产品即保持了天然酪素涂饰的优点,又在一定程度上改进了其耐湿擦牢度和耐曲挠性。     

Bioavailability of peptides from casein hydrolysate in vitro: Amino acid compositions of peptides affect the antioxidant efficacy and resistance to intestinal peptidases

Measurements of in vitro bioactivity to support health benefits of bioactive compounds should be accomplished with estimates of their bioavailability to bolster nutritional significance to health claims. In vitro bioavailability of casein and casein peptides (casein hydrolysate and four peptide fractions) measured by the amount of peptide nitrogen is discussed. Antioxidant activities during gastrointestinal digestion and Caco-2 cell absorption were investigated as indices of peptide degradation. The antioxidant capacities of Trolox equivalent and oxygen radicals were used for assessing antioxidant efficacy of surviving peptides. Results showed that casein hydrolysate improved bioavailability compared to casein. Amino acid composition of peptides affected the resistance of peptides to digestive enzymes and intestinal peptidases. The acidic peptide fractions had higher bioavailability and a higher residual ratio of antioxidant activity. The peptides in the digest and absorbate of acidic fraction F1 with the highest bioavailability (23.14%) and the residual ratio of antioxidant activity were identified, and 12 intact, absorbed peptides (IAP) were obtained. Eleven of twelve of the IAPs were from β-Casein, and their amino acid components were rich in acidic and hydrophobic amino acids. Identification of IAPs might provide insight into the mechanism of how peptide structure provides resistance against peptidases by Caco-2 cells.     

阻燃非织造材料中对位芳族聚酰胺Twaron的性能

描述了测定材料阻燃特性的热重分析法和热分析法,用改性聚丙烯腈系纤维、粘胶、二氧化硅、三聚氰胺和对位芳族聚酰胺Twaron制成的非织造材料的耐明火性能.分析表明Twaron具有高耐热性、高强度和极好的尺寸稳定性.明火试验表明Twaron具有良好的热绝缘性.     

涂饰剂对皮革阻燃性的影响

在优化阻燃皮革工艺的基础上，选用了四种成膜剂：丙烯酸树脂、聚氨酯、硝化纤维、乳酪素涂饰于皮革中，研究其对皮革阻燃性的影响。结果发现，综合垂直燃烧指标和氧指数指标发现，四种成膜剂中，硝化纤维和酪素的皮革抗燃性好，其中，硝化纤维抗燃性最好，但是相比较空白样，都有降低皮革的抗燃性的性质，聚氨酯和丙烯酸分别排列其后；而经聚氨酯涂饰的皮革，其在燃烧过程中，伴随着大量烟雾的放出，所以其烟密度很大。而硝化纤维有焰燃烧时间长，但发烟量小，酪素与丙烯酸树脂的烟密度基本上差不多。综合三个指标来看，硝化纤维、酪素、丙烯酸树脂和聚氨酯依次显示抗燃性。     

Transfer efficiency of melamine from feed to milk in lactating dairy cows fed with different doses of melamine

This study was conducted to investigate the transfer efficiency of melamine (1,3,5-triazine-2,4,6-triamine) from feed to milk of lactating cows fed with different doses of melamine. Twenty-four China Holstein dairy cows were divided into 2 blocks according to milk yield (block 1 and block 2 for low- and high-producing cows). Cows of block 1 or block 2 each were randomly assigned to 1 of 4 treatments in a randomized complete block design and each treatment had 6 cows. The cows of treatments 1 to 4 were dosed with melamine at 0 (control), 90 (treatment 1), 270 (treatment 2), and 450 (treatment 3) mg/d per cow, respectively. The trial lasted 19 d. During the first 13 d, cows were fed melamine at the respective treatment levels, and the last 6 d was the clearance period after melamine was withdrawn. The results indicated that the levels of melamine used did not affect milk yield or composition. The mean milk melamine concentration increased during the initial 3 d after melamine feeding in all the melamine-supplemented groups, and then fluctuated slightly over the remaining 10 d of melamine feeding. No melamine was detected in the milk of any groups on d 4 of the clearance period. Milk melamine concentration measured between 3 to 13 d was significantly affected by melamine feeding doses, but was not influenced by milk yield. The transfer efficiency of melamine from feed to milk was not affected by melamine doses (0.95, 0.70, and 0.66% for treatments 1, 2, and 3, respectively), but was linearly related with milk yield (0.56% for block 1 and 0.95% for block 2, R² = 0.80). The milk melamine concentration was linearly related with melamine intake (R² = 0.84). The present study demonstrated that when the daily intake of melamine exceeds 312.7 mg/cow, the milk should not be used to produce infant formula powder.     

蜜胺餐具中三聚氰胺单体的迁移规律研究

结合蜜胺餐具的实际使用情况,选用合适的食品模拟物进行迁移实验,采用LC-MS/MS法测定三聚氰胺迁移量,研究蜜胺餐具中三聚氰胺单体的迁移规律。重点考察了食品模拟物种类、接触时间、接触温度、乙酸浓度、乙醇浓度、重复使用和微波加热等迁移条件下蜜胺餐具中三聚氰胺迁移量的变化情况。结果表明酸性食品和牛奶中的三聚氰胺迁移风险较高,且需控制蜜胺餐具的使用温度、盛放时间、重复使用次数及微波加热功率和时间以降低密胺餐具中三聚氰胺迁移风险。