新型食品包装用聚氨酯胶粘剂毒性研究

本文指出研究食品用包装材料的毒性具育重要意义。详细阐述溶剂型双组份聚氨酯胶粘剂毒性研究技术方案的制定、试样制备、毒理学试验目的、材料、方法、结果以及综合评价方法。得出溶剂型双组份聚氨酯胶粘剂无毒,无致畸、无致癌可能性的结论。     

聚氨酯粘合剂

一、前言聚氨酯粘合剂是粘合剂中主要品种之一,其最大的特点是很容易通过组成的调节、获得从柔软(橡胶)到坚硬(塑料)的各种不同的品种,故适用范围较广。1968年将聚氨酯粘合剂用于玻璃纤维增强塑料的粘接,1978年改进了双组份聚氨酯的包装以及单组份聚氨酯粘合剂开始实用化后,使聚氨酯粘合剂发展更快,国外聚氨酯粘合剂每年的增长速度一般为15—20％,预计最近五年中每年增长速度要超过30％,国内聚氨酯粘合剂自从1966年生产以来,产量逐年增加,受到用户的欢迎。     

静电植绒用双组份聚氨酯粘合剂的研制

用双预聚工艺制备了静植绒用无溶剂双组份聚氨酯粘合剂，讨论了原料等因素对组份粘度、固化速度、植绒牢度、手感的影响。     

聚氨酯粘合剂在干式复合中的使用技术

本文就双组份聚氨酯粘合剂在干式复合中的使用技术要点作了介绍,例如粘合剂的选用,调配和涂布。     

下游动态

<正>万华北京推出耐辛辣及化学介质高温蒸煮粘合剂目前,万华化学(北京)有限公司凭借多年的技术积累,终于突破技术壁垒,打破国外垄断,成功研发出耐高温蒸煮型复合粘合剂,且其完全可以用来包装含辛辣、溶剂等内容物的高性能粘合剂。WANANTE6060A/WANEXEL761B双组份聚氨酯溶剂型耐辛辣蒸煮复合粘合剂,其用于复合蒸煮袋,蒸煮后剥离强度可达到4N/15mm;当内容物为辛辣介质,经121℃*30min蒸煮后,将样品袋放置于60℃烘     

脂肪族聚氨酯涂料

上海市涂料研究所研制生产的7650/7312和7470/7312聚酯聚氨酯涂料,7860/7312丙烯酸聚氨酯涂料,PS—90单组份聚氨酯涂料系最新开发的新一代聚氨酯涂料,与国内其它聚氨酯产品相比,它的最大特点是:长期阳光暴晒不变色不失光,具有特殊的装饰和防护性能。它将作为高新产品占领市场,前景极为广阔。 该系列产品是合成树脂—固化剂,双组份(或单组份)溶剂型涂料,选用优质颜料、填     

工程车用水性环保涂料配套体系的研究与应用

面对严峻的环保形势,依据水性汽车涂料唯一行业标准HG/T 4570-2013《汽车用水性涂料》要求,研究并开发了工程车用环保型水性双组份环氧底漆/水性双组份聚氨酯中涂漆/水性双组份聚氨酯面漆配套体系。该配套体系综合性能较好,具有优异的附着力、耐水、耐化学品和耐候性能,各项性能指标均满足或远远超过标准要求。工程车用水性环保涂料配套产品已进行整车涂装,具有较高的光泽和丰满度,完全可以替代传统溶剂型同类产品,具备巨大的市场潜力。     

应用双组份聚氨酯粘合剂特性参数研制解决PVC塑膜绒界面粘合牢度及手感

混型结构的双预聚体聚氨酯粘合剂,是一种性能优良的高分子涂料。它对很多材料具有良好的粘接性,其物理、化学等综合性能也较好。本文就双组份聚氨酯粘合剂,应用其组份特性参数ε(?),ε及配比中聚脲量参数K,研制解决PVC塑膜绒界面粘合牢度及手感等技术关键,作重点叙述。一、问题的提出七十年代,国外市场上出现了塑绒产品,但国内尚是空白。为此,研制适宜用于PVC塑膜高压静电植绒的粘合剂,配套很     

PVC植绒胶

本文介绍的 ＰＶＣ植绒用双组份聚氨酯粘合剂，主要用于汽车车窗 ＰＶＣ嵌条的静电植绒，本文介绍了该植绒胶的组份选择和制备及使用方法等。     

新型聚氨酯涂料固化剂—M99

本文通过对Ｍ９９固化剂的应用研究，以解决目前双组份及单组份聚氨酯涂料施工过程中游离异氰酸酯单体蒸气毒性，改善环境，改善污染。     

Experimental and numerical analysis of single lap bonded joints: Epoxy and castor oil PU-glass fibre composites

ABSTRACT

Currently, there is a growing concern for the environment. Several studies of new materials to reduce environmental impact have been carried out by different research groups, and many companies have replaced parts made of fossil sources by renewable materials. The use of polyurethane (PU) derived from castor oil as a matrix for composite materials and adhesives is one example. Hence, the present work aims to compare the numerical and experimental analyses of castor oil PU and epoxy resin not only as a matrix of composite materials, but also as an adhesive of bonded joints. The joint coupons were manufactured by using castor oil PU-glass fibre and epoxy-glass fibre as adherents, which were bonded by epoxy or castor oil PU. Thus, four combinations of adherents and adhesives were investigated. Specimens with identical geometry were used in all tests, which were based on guidelines for single lap bonded joints. Computational simulations via Finite Element Method were performed for predictions of the adhesive layer stresses and strength. In addition, a material model is proposed to predict the failure of the adhesive layer. The experimental and numerical results showed that PU derived from castor oil has good mechanical performance, making this material a feasible alternative for bonded joints, mostly nowadays when environment is a major concern.     

聚氨酯改性氯丁接枝低毒溶剂型鞋用胶粘剂的研制

研究了一种能粘多种材质的溶剂型鞋用大底胶。该胶为一种聚氨酯改性氯丁、SBS接枝胶,粘接范围广,对PU、TPR、SBS等材质粘接性能比氯丁接枝胶好,适合鞋厂流水生产线;所用溶剂毒性相当低,对人无害,有利于劳动保护和环境保护。     

聚氨酯胶粘剂的研究进展

综述了聚氨酯胶粘剂的合成、特性和种类。概述了近年来国内外聚氨酯胶粘剂的研究和应用进展,重点介绍了聚氨酯胶粘剂的发展动态和几类主要的聚氨酯胶粘剂,并对其进行了分析,结合实际情况对今后聚氨酯胶粘剂的发展方向作出了展望。     

沸石分子筛对消除聚氨酯胶粘剂固化气泡作用的研究

研究了13X沸石分子筛对双组分聚氨酯胶粘剂固化性能的影响。结果表明,13X分子筛含量为3%～5%时,不仅可延长聚氨酯胶粘剂的适用期,而且还可消除聚氨酯胶粘剂固化后产生的气泡。     

纳米SiO_2改性聚氨酯胶粘剂的制备及性能研究

采用预聚体一步法制备了单组分湿固化nano-SiO2(纳米SiO2)改性PU(聚氨酯)胶粘剂,并利用红外光谱(FT-IR)法、热失重分析(TGA)法、差示扫描量热(DSC)法和扫描电镜(SEM)等对nano-SiO2改性PU胶粘剂的性能进行了分析和探讨。结果表明:纳米粒子的存在使PU的氢键结构发生了变化;随着nano-SiO2含量的不断增加,改性PU胶粘剂的初始粘接强度和最终粘接强度均呈先升后降态势,并且在w(nano-SiO2)=1.2%(相对于PU预聚体质量而言)时相对最大,而且分别比纯PU胶粘剂增加了117%和108%;同时,与纯PU胶粘剂相比,用1.2%nano-SiO2制备的PU胶粘剂,其熔融温度和分解温度分别提高了2.67℃和2.92℃;当w(nano-SiO2)≤1.2%时,nano-SiO2在PU胶粘剂基体中的分散性相对较好。     

软包装用聚氨酯胶黏剂发展近况

简要介绍了软包装及所用聚氨酯(PU)复膜胶的迅猛发展历程.分别介绍了溶剂PU胶黏剂、醇溶PU胶黏剂、无溶剂PU胶黏剂和水性PU(WPU)胶黏剂的发展概况及其优缺点.随着技术进步和环保意识的增强,PU复膜胶由溶剂型逐步向无溶剂、水性方向发展.还介绍了将丙烯酸酯基团引入WPU主链以降低成本、改进某种性能、引人双键等方面的研...     

Hydrophobic or Hydrophilic Fumed Silica as Filler of Polyurethane Adhesives

Two hydrophilic and two hydrophobic fumed silicas of different characteristics were added to solvent-based polyurethane adhesives (PU). IR spectroscopy, contact angle measurements and rheology (viscosity measurements, determination of viscoelastic properties) were used to monitor the variation of properties of PU adhesives produced by addition of silica. Immediate (green) adhesion was determined by T-peel testing of halogenated synthetic rubber/PU adhesive/halogenated synthetic rubber joints. Silica addition produced a noticeable increase in the PU adhesive viscosity which can be related to the variation of viscoelastic properties. Viscosity of PU adhesives containing hydrophilic silica slightly increased with time after preparation; the increase was less significant in PU adhesives with hydrophilic silica. In the rheological studies, silica imparted shear thinning and negative thixotropy to PU adhesives due to a better dispersion of the silica in the polyurethane during shearing. The addition of silica produces an increase in the storage modulus (G') of PU adhesives, the values obtained being independent of the hydrophilic or hydrophobic nature of the fumed silica. The increase of G' and the changes in tan δ of PU adhesives containing silica corresponded to an improvement in the green adhesion properties of chlorinated rubber/PU adhesive/chlorinated rubber joints. In general, in disagreement with previous results,¹ the presence of silica did affect the properties of solvent-based PU adhesives, but these properties were not dependent on the type of silica (hydrophobic or hydrophilic) used in this study.     

聚氨酯改性环氧树脂的制备及其粘接性能

制备了聚氨酯(PU)改性环氧树脂(EP),使用红外光谱(FT-IR)和扫描电子显微镜(SEM)对其结构进行了表征,并对其固化物的热性能和动态热机械性能进行了研究;以PU改性EP为基体树脂制备胶粘剂,并对该胶粘剂的性能进行了测定。实验结果表明,由于PU链段可以改善EP的韧性,并且两者相容性较好,故由此制取的胶粘剂综合性能良好,其拉伸剪切强度为16MPa、粘接拉伸强度为35MPa且断裂伸长率为1.8%。     

Nano boron nitride/polyurethane adhesives in flexible laminated food packaging: Peeling resistance and permeability properties

Polymeric multilayer films are widely used in food packaging due to their versatility. However, there are still some properties that might be improved, such as gas and vapor barrier behaviors. The incorporation of boron nitride into polymer matrixes is emerging as a potential method for the improvement of barrier properties due to its lamellar structure. In this context, our work investigates the addition of boron nitride into a bicomponent reactive polyurethane (PU), which could be used as an adhesive and improve the barrier layer. This material could be used as an alternative to aluminum foil in food packaging. Different concentrations of two different sizes of boron nitride (BN) particles were added to the PU adhesive: micro-structured boron nitride (BNm) and nano-structured boron nitride (BNn). The aim was to investigate the influence on the barrier properties against moisture and the peeling resistance. Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) were performed to characterize the boron nitride samples. The effect of BNm or BNn addition on the glass transition of the nanocomposites was investigated by differential scanning calorimetry (DSC). Barrier properties were measured by a water vapor permeation test and the practical adhesion of laminates with BN/PU adhesives was characterized using peeling tests. The nanocomposites achieved reduction in water vapor permeance of up to 50% and a 37% increase in mechanical adhesion properties compared to the PU adhesive. The results revealed the high potential of boron nitride/PU adhesives for food packaging applications.     

聚氨酯水凝胶在生物医学工程中的应用

介绍了聚氨酯(PU)水凝胶在药物缓释系统、创伤敷料、接触眼镜、组织工程材料和医用胶粘剂等领域中的研究进展,探讨了PU水凝胶在生物医学工程中的应用及发展趋势。