羧甲基纤维素/蜜胺树脂相变纳米储能材料的制备与表征

以羧甲基纤维素(CMC)改性的蜜胺树脂作为壁材,以石蜡为芯材,采用原位聚合法,制备CMC改性的蜜胺树脂相变纳米胶囊。采用FTIR、DSC、SEM及光学显微镜等现代分析仪器对产物的性能进行分析和表征,探讨乳化剂种类和芯材乳液制备转速对胶囊制备过程的影响。结果表明,采用复配乳化剂制备的相变胶囊的性能要优于使用单一乳化剂制备的相变胶囊;当制备芯材乳液的转速为8 000 r/min时,芯材乳液的性能最好;所制得的相变胶囊为球形、平均粒径约为50 nm,且包裹完全、粒径均匀,相变焓为81.87 J/g。     

角蛋白改性脲醛树脂胶的研究

角蛋白改性脲醛树脂胶的试验结果表明,利用角蛋白与脲醛树脂进行共聚反应,可以得到环保型的改性脲醛树脂胶;最佳工艺条件为:摩尔比为1.31.0;角蛋白加入时间在第3次尿素投料后,角蛋白加入量为尿素的5%。采用角蛋白改性脲醛胶压制的胶合板,胶合强度达到了国家标准GB/T9846—2004Ⅱ类板胶合要求,其甲醛释放量也达到了国家标准E1级胶合板用胶标准。     

实木复合地板用无醛胶粘剂研究

以水性高分子异氰酸酯胶粘剂为主要研究方向,在水基高分子物制备中采用聚乙烯醇、改性淀粉、胶乳等与助剂共混制成主剂,再与异氰酸酯交联制成胶粘剂。试验结果表明,用此种无醛胶粘剂压制的三层实木复合地板的物理力学性能完全达到国家检测标准;在生产中可操作性强,完全满足现有的工艺要求;无甲醛公害;其原料成本为诺贝尔胶的一半,具有明显的社会效益和经济效益。     

异氰酸酯稻草刨花板制造工艺的研究

利用自制的异氰酸酯胶粘剂YQJ-A,通过正交试验和单因子试验,优化出了制造满足国家标准的稻草刨花板的热压工艺;通过详细的研究表明,密度、施胶量和施蜡量是影响稻草刨花板各主要性能的重要因素,刨花的含水率主要影响吸水厚度膨胀率;试验中还发现,受潮的稻草刨花板在阴湿环境中,易受多种霉菌侵蚀。     

苯酚-三聚氰胺-尿素-甲醛胶粘剂的合成及其应用

通过共缩聚的方法,制备了具有良好的耐水性能和胶合性能的苯酚-三聚氰胺-尿素-甲醛树脂。着重讨论了该树 脂的制备方法以及在压制室外型中密度纤维板中的应用情况。     

酚醛树脂浸渍木粉DTA/TG曲线解析

采用差热天平,对木粉、酚醛树脂和酚醛树脂浸渍木粉进行测试,通过DTA/TG曲线解析,展示酚醛树脂浸渍木粉的热解动态,探讨木质树脂复合炭材的构造及性能。     

Preparation of strongly acidic cation-exchange resins from gymnosperm acid hydrolysis lignin

The chemical preparation of strongly acidic cation-exchange resin from sulfuric acid lignin (Klason lignin) (SAL), a typical acid hydrolysis lignin, was investigated. Sulfonation of resinified SAL itself gave a resin with an ion-exchange capacity of 2.3 mEq/g. After resinification with formaldehyde, the phenolized SAL with a reactivep-hydroxyphenyl group yielded a resin with an ion-exchange capacity of 3.2 mEq/g. The latter capacity is superior to that of the corresponding commercial phenol-type resins (2–3 mEq/g), but did not reach the level of the corresponding commercial styrene-type resins (4-5 mEq/g).This paper was presented at the 43th Lignin Symposium, Fuchu, October 1998     

Development of structural composite products made from bamboo I: fundamental properties of bamboo zephyr board

A study was conducted to determine the suitability of zephyr strand from moso bamboo (Pyllostachys pubescens Mazel) for structural composite board manufacture. Thirty-two 1.8×40×40cm bamboo zephyr boards (BZB) were produced using four diameters of zephyr strand (9.5, 4.7, 2.8, and 1.5mm) and four target densities (0.6, 0.7, 0.8, and 0.9g/cm³). Results indicate that BZB exhibits superior strength properties compared to the commercial products. The size of the zephyr strand and the level of target density had a significant effect on the moduli of elasticity and rupture, internal bond strength, water absorption, and thickness swelling, but they did not have a significant effect on linear expansion. With regard to the physical properties, BZB exhibited less thickness swelling and exhibited good dimensional stability under dry-wet conditioning cycles.Part of this research was presented at the 48th annual meeting of the Japan Wood Research Society, Shizuoka, April 1998; it was reported at the 4th Pacific Rim Bio-Based Composite Symposium, Bogor, Indonesia, November 1998     

Decontamination of synthetic solutions containing heavy metals using chemically modified sawdusts bearing polyacrylic acid chains

New materials containing carboxylate groups have been synthesized by grafting polyacrylic acid onto sawdust. These new adsorbents were subjected to continuous extraction of different metal ions using packed columns to determine their maximum binding capacities. They exhibit binding capacities 15–40 times higher than unmodified sawdusts for removal of Cu²⁺, Ni²⁺, and Cd²⁺ chosen as representative heavy metal ions. Cation desorption and adsorbent regeneration could be effected by elution with a diluted HCl solution; water as an eluent has no effect on metal desorption.     

制备工艺对标签胶性能影响的研究

以脱脂大豆粉(SF)为原料制备豆粉标签胶,主要研究了制备工艺(包括液料比、尿素加量、交联剂加量、处理时间和处理温度)对豆粉标签胶黏度、粘接性能和耐水性能的影响,并借助红外光谱对标签胶进行分析与表征。研究结果表明,豆粉标签胶的最佳制备工艺为:m(水):m(SF)为3.0:1.0,尿素加量100%,交联剂加量4.5%(占SF质量),处理温度70℃,处理时间1.0 h。此条件制备的豆粉标签胶黏度为32450mPa.s,粘接力177 N,耐常温水性(20±2)℃≥104h,远高于标签胶行业标准规定的72 h要求。FT-IR分析表明,加入交联剂后,大豆蛋白在波数为1 168 cm~(-1)处产生新特征峰,这可能是该研究豆粉标签胶具有较佳耐水性能原因所在。