纳米羟基磷灰石/天然胶乳复合乳胶膜的制备及性能表征

对比研究了纳米羟基磷灰石(n-HA)经硅烷偶联剂(KH-570)表面改性前后的性能变化,实验结果表明,n-HA经改性后,疏水性得到提高,其表面与KH-570发生了偶联作用(FT-IR);将改性的n-HA与天然胶乳复合制备复合乳胶膜,力学性能测定结果表明,复合乳胶膜的力学强度与未经处理的相比有一定提高;另外n-HA还能够有效的抑制复合乳胶膜中水溶性蛋白的析出,利用考马斯亮蓝法测定复合材料中的水溶性蛋白,随着n-HA的添加量的增加,复合乳胶膜中的水溶性蛋白被屏蔽,溶出量逐渐降低。     

阳荷性天然乳胶的制备

本文选择一种阳离子表面活性剂为制取阳荷性天然胶乳的稳定剂,直接把天然胶乳与这种表面活性剂的溶液混合,制取阳荷性天然胶乳,拓宽了天然胶乳的应用范围。     

生物酶法催化天然乳胶中过敏蛋白质交联的研究

利用谷氨酰胺转氨酶催化天然乳胶(NRL)水溶性蛋白质(WSP)发生交联,减少天然乳胶中水溶性蛋白质的含量.利用粒径分析、结构表征、十二烷基硫酸钠凝胶电泳实验证明了交联反应的发生.采用这一新技术可以降低天然乳胶制品的过敏性,拓展了其在医疗卫生领域、食品加工等领域的应用空间.     

美研制成功不致敏天然乳胶

美国Vystar公司最近宣称已开发出一种不会导致蛋白质过敏的天然乳胶-Vytex乳胶。     

我国乳胶行业现状及2010年展望

我国乳胶制品门类齐全、价格适中、质量较高,具有一定的国际竞争力。2008年下半年,金融危机使我国乳胶制品出口严重受阻。我国乳胶企业积极应对,坚持自主创新,加强技术进步,调整产品结构,开展节能减排,取得了较好成效。我国乳胶制品2009年消费天然胶乳18万t,工业总产值60多亿元。预计国内外乳胶制品总体需求仍稳步增长,金融危机过后,我国乳胶行业将继续平稳较快发展。     

仿生助产仪用高品质乳胶球囊的研制与开发

天然胶乳因其高强度、高弹性、高柔软性和成膜性能好,以及较低的成本价格,使其在乳胶弹性制品市场占据重要位置。除更好的物理和化学性能以外,医用乳胶制品比普通乳胶制品的要求更高。本文针对医用仿生助产仪配套用高品质乳胶球囊产品,通过产品外形设计、配方和工艺设计优化,在保证乳胶球囊在高膨胀率、高充盈状态下物理性能的前提下,降低亚硝胺含量和蛋白质含量,从而提高产品整体质量,满足同类产品的国内市场需求。     

天然乳胶的抗老化性能研究

对多孔纳米二氧化硅(SiO_2)和纳米硅粉(Si)进行改性,并与天然乳胶进行共混,通过接触角测量、老化试验、拉力试验和扫描电子显微镜(SEM)等实验和测试手段,研究了改性混合粉体的表面性能及对天然乳胶的力学性能和抗老化性能的影响。结果表明,使用十二烷基三甲氧基烷偶联剂(DDES)对Si和SiO_2粉体进行修饰后,当M-Si∶M-SiO_2=4∶6时,加入到乳胶中,复合材料的断裂伸长率和抗老化性能均得到了大幅度的提升,老化前的断面网络更加明显。     

天然乳胶在布面胶鞋生产中的应用

1前言传统的布面胶鞋生产,都是使用以溶剂、汽油等有机溶剂溶解混炼胶片制成的汽油胶浆,虽然粘合效果好,但由于大量使用易挥发的有机溶剂,生产和使用极不方便,既危害工人健康,污染环境,又造成安全隐患,需要完善的通风、防火措施;而且制备工艺复杂,流程长,能耗高。国内外的胶粘剂行业正大力发展各种水基粘合剂来取代现在广泛使用的有机粘合剂。天然乳胶在市面胶鞋中的应用正顺应了这一发展方向。2配方设计21原理可用传统的“促进剂、硫磺”的形式使胶乳硫化,使其具备使用性能;配入适当的防老剂,以保证使用寿命。由于天然乳胶容…     

提高乳胶气囊耐疲劳性能的研究

研究提高乳胶气囊在高伸长率（高充盈）状态下耐疲劳性能的方法。结果表明,采用防老剂CPL和防老剂DTBHQ并用（并用比1/1）,增加胶乳预硫化工艺（60 ℃下水浴恒温4 h）和预硫化胶乳离心处理,乳胶气囊的耐疲劳性能明显提高,在700%伸长率下的平均疲劳次数达到85,产品性能可以满足国内市场乳胶气囊的使用要求。     

Degradability testing of radiation-vulcanized natural rubber latex films

The degradability under various conditions of five kinds of radiation-vulcanized natural rubber latex (RVNRL) films was studied. The treatments were leaching in methanol, leaching in 1% ammonia solution, mixing with tris(nonylated phenyl)phosphite (TNP) antioxidant, blending with poly(methyl methacrylate) (PMMA), and grafting with PMMA, Comparisons were made with sulfur-vulcanized natural rubber latex (SVNRL) film. RVNRL films SVNRL film can be kept for a long time when indirectly exposed to sunlight at room temperature. However, the former degraded much more rapidly than did the latter. TNP was found to be very suitable as an antioxidant to prolong the life of RVNRL films under dry conditions. PMMA, either blended or grafted with RVNRL, was ineffective in the prevention of deterioration of RVNRL films. The rapid degradation of RVNRL products could be an advantage over SVNRL products in environmental and wildlife conservation. © 1994 John Wiley & Sons, Inc.     

天然胶乳的氢化

以水合肼、双氧水和硼酸为催化体系,对天然胶乳进行非贵金属催化的原位母体加氢.并用核磁共振氢谱对氢化天然胶乳的结构进行表征.结果表明,氢化度随着硼酸用量的增加而增大,当硼酸/碳碳双键(摩尔比)达到0.25时,天然胶乳的加氢度接近60%;     

小颗粒“胶乳法”氯化天然橡胶穿透干燥试验

通过氯化天然橡胶(CNR)的穿透干燥试验,探讨风温、风速以及粒径对“胶乳法”CNR干燥速率的影响规律,结果表明,温度和风速对含水量的下降速率影响较大,而粒度对其影响较小。建立了穿透干燥方程,对实验数据进行了拟合,结果显示其吻合性较好。红外光谱分析以及物理性能测试结果表明,“胶乳法”CNR物料的干燥温度应控制在100℃以下。     

蛋白质含量低的天然胶乳制品

讲述了无粉天然胶乳制品的生产方法及用其制造的无粉天然胶乳手套。该手套的可抽出蛋白质含量非常低,无需经卤化处理。这种方法是：在将天然胶乳制品从模型上剥离下来的前后,采用漂洗溶液处理。由于漂洗溶液含有离子形式的离解金属盐,可降低胶乳中的蛋白质含量。当制品从模型上剥离下来后,漂洗溶液也可除掉制品上的残留粉末,生产出无粉末的天然胶乳制品。无氯处理的制品具有良好的抓着性能,并且贮存期也比同类经氯化处理的制品要高。     

Diimide hydrogenation of natural rubber latex

Hydrogenation is one important method of chemical modification, which improves the physical, chemical and thermal properties of diene‐based elastomers. Natural rubber latex (NRL) could be hydrogenated to a strictly alternating ethylene‐propylene copolymer using a diimide reduction system. The diimide reduction technique of NRL was accomplished by using hydrazine hydrate/hydrogen peroxide and Cu²⁺ as catalyst. The hydrogenated products are characterized by FTIR and NMR spectroscopy. It has been found that cupric acetate is a highly active catalyst for the reaction and the addition of a controlled amount of gelatin demonstrated a beneficial effect on the degree of hydrogenation, whereas, sodium dodecyl sulfate (SDS) acted as a stabilizer of the latex particle in the reaction system and reduced the degree of hydrogenation. In the presence of SDS, a longer reaction time and a higher amount of hydrazine hydrate was required for hydrogenation of NRL. Gel formation during hydrogenation does not significantly affect the degree of hydrogenation. Gel inhibitors such as hydroquinone also decrease the degree of hydrogenation. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Noncatalytic hydrogenation of natural rubber latex

Hydrogenation is an important method of chemical modification, which improves the physical, chemical, and thermal properties of diene‐based elastomers. Natural rubber latex (NRL) could be hydrogenated to a strictly alternating ethylene–propylene copolymer using diimide generated in an in situ system. The diimide generated using the in situ technique for hydrogenation of NRL was accomplished by thermolysis of p‐toluenesulfonyl hydrazide (TSH). A molar ratio of TSH to double bonds equal to 2 : 1 was found to be the optimum ratio to provide a high percentage of hydrogenation. 95% Degree of saturation of NRL was achieved in o‐xylene. Hydrogenated products are characterized by FTIR and NMR spectroscopy. The thermal stability of hydrogenated rubber was improved as shown from the results of thermogravimetric analysis. From the differential scanning calorimetry measurement, the glass transition temperature of the hydrogenated product did not appear to change. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2885–2895, 2007     

乳胶漆的生产与检测

介绍乳胶漆的组成、工艺设备和检测标准 ,以及如何操作才能达到合适的性能价格比。     

改性天然胶乳胶粘剂研究

采用助剂对天然胶乳进行改性,得到改性的天然胶乳胶粘荆.研究了表面活性剂浓度、搅拌时间以及甲醛的滴加速度对改性天然胶乳性能的影响.实验结果表明,当表面活性剂OP-10浓度为0.6 g/L,用量为5 g;平平加O用量为0.7 g;反应搅拌时间大于10 min;甲醛滴加速度小于5滴/10 s时,所得的胶粘剂性能较好,可用于沙发等的粘接.     

改性天然胶乳研究进展

介绍了天然胶乳的特点,综述了天然胶乳改性的研究进展,指出了目前胶乳改性所存在的问题,并展望了未来发展趋势。