聚氨酯为绿色轮胎添亮点

汽车工业是我国乃至世界经济发展的支柱产业。进入20世纪90年代以来，轮胎工业发展总的趋势仍然是进一步提高子午化、扁平化、无内胎化和高速度化水平。其中．突出的一点就是人们对环保意识和节能意识越来越强烈。随着国家有关限制汽车燃料消耗的法规越来越严，各种低能耗轮胎——低滚动阻力轮胎相继问世。由于这种轮胎的能耗低，对环保极为有利，由此便产生了绿色轮胎的概念。     

实现持续发展是工程师的职责

提出了工程师需要了解并设法防治的三代环境污染问题，重点放在设计环保化的理论与实践上。工程师们必须不断学习、分析和运用新知识与技术，特别是作为实现持续发展基本工具的设计环保化。     

胶粘剂的环保问题与对策

本文论述了胶粘剂中存在的环保问题，简要分析了主要污染物及其危害，提出了胶粘剂符合环保要求的发展方向是水性化、无溶剂化、固体化、低毒化。采用先进的清洁生产工艺，生产环保型绿色胶粘剂是当代可持续发展的迫切需要。     

智慧化管理在化工园区中的应用与建设

智慧化管理是化工园区未来发展的重要方向，以江苏省某智慧化工园区为例展示了智慧化在安全、环保、能源、应急和封闭化管理中的应用。同时针对如何建设智慧化工园区提供了一些建议，旨在为园区的研究提供参考。     

化工园区环保管家智慧化服务应用进展

近年来，我国化工行业发展迅速，虽然为国民经济水平的提升奠定了一定基础，但化工园区的污染问题越来越严重。化工园区引入环保管家已成为一种趋势。同时，将信息技术应用到化工园区的环保工作中，促进环保管家实现智慧化服务，是解决化工园区污染问题的有效手段。本文就化工园区环保管家智慧化服务的内容及其应用进行介绍，以期为行业提供参考。     

溶剂型氯丁胶粘剂的环保化

论述了环保型胶粘剂的基本特点，分析了溶剂型氯丁胶粘剂的毒性与污染来源，提出了溶剂型氯丁胶粘剂环保化的途径，介绍了环保型氯丁胶粘剂的配制原则，指出了溶剂型氯丁胶粘剂的惟一生路是环保化。     

环氧树脂特种固化剂的研制与应用

摘自：www．china-painting．net 环氧树脂产品正在向系列化、精细化、无色化、专用化、高纯化、绿色环保化、性价比最大化方向发展，与之相配套的固化剂产品正在形成规模化、高纯化、特色化、高性能化和专业化。     

氯丁胶的研究现状与发展趋势

综述了溶剂型氯丁胶和水性氯丁胶的研究进展,并对两者的优缺点和存在的问题进行了对比和分析。最后对环保型水性氯丁胶的发展方向进行了展望。     

我国光固化技术将向“三化”发展

据有关专家介绍，我国光固化技术未来应用与发展方向主要是以下3个方面：一是水性化即环保化。因为光固化用的引发剂是小分子材料，在盛放食品的容器里会逃逸出来，这样使用就受到限制；还有它在固化时虽然不使用溶剂，但加入的活性稀释剂是有刺激性的。而水性产品是真正环保的，它可适用于电子束技术，电子束穿透力强，电子束是辐射固化在国内的发展方向，     

2007年中国塑料助剂产业与市场研讨会即将召开

随着我国塑料制品产业的蓬勃发展，塑料助剂行业发展步伐逐渐加快，产品走向多功能化、高性能化、高分子量化、环保化的发展道路。2005年我国塑料制品行业共消耗各类加工助剂205万t，预计未来几年我国塑料助剂需求量年均增长10％。面对庞大的潜在市场，我国塑料助剂企业未来应走向何方？随着RoHS和WEEE“双指令”的实施，以及欧盟即将实施的REACH法规，企业又该如何应对？     

Preparation and Properties of a Waterborne Contact Adhesive Based on Polychloroprene Latex and Styrene-Acrylate Emulsion Blend

Environmental protection and legislative pressure to eliminate the use of solvents in the adhesive industry have inspired the search for safer alternatives. In the area of contact adhesives, the waterborne route has proved to be of particular interest. Based on the synergistic effect of polychloroprene latex and styreneacrylate emulsion, a waterborne contact adhesive consisting of polychloroprene latex (PCL) and styreneacrylate emulsion (SAE) blend has been developed. In order to blend PCL with SAE easily and to accelerate the drying rate of the adhesive, boric acid was chosen for use in the PCL/SAE blend system. Effects of boric acid and SAE content on the properties of PCL/SAE blends, such as pH value, storage stability and set time, were investigated. At the same time, the effect of SAE content on the mechanical properties of PCL/SAE blend films was studied. The morphology of blend films was characterized by Atomic Force Microscopy. The adhesive performance of the waterborne contact adhesive was evaluated by peel and shear tests. The results showed that when the waterborne contact adhesive formulation contained 40 wt% styrene-acrylate emulsion (dry weight) and 1.25 wt% boric acid, it had a good shelf-stability, its set time was 5 min, and the blend film with this formulation was ductile and flexible with reasonably good tensile strength and very high elongation at break. And the blend films showed structure with a sea–island morphology. The waterborne contact adhesives derived from PCL/SAE blends were found to be comparable to the commercially available solvent-based contact adhesives. The synergistic effect of polychloroprene latex and styrene-acrylate copolymer emulsion was also discussed.     

Behavior of adhesion forces of the aqueous-based polychloroprene adhesive magnetically conditioned

This research is an innovation proposal for magnetic conditioning of the aqueous-based polychloroprene contact adhesive with the purpose of increasing the adherence capacity between the adhesive and the substrate. Today, the aqueous-based polychloroprene contact adhesive presents an adhesion capacity variation between 1.15 and up to 2.75 kgf/cm². On the other hand, the solvent-based polychloroprene adhesives support average tensions of shearing of 3.8 kgf/cm². To promote an increase in adhesion to the aqueous-based polychloroprene contact adhesive, we formulated one adhesive using a nano-additive, carbon dioxide as catalyst, and a magnetic conditioning process before the phase of application on the substrates. The results obtained show an average increase of 292% in the shearing tension of the adhesive magnetically conditioned when compared with an adhesive of same formulation without the magnetic conditioning and when compared to the commercial aqueous-based polichloroprene adhesive, the increase reaches 122%.     

The effect of surface properties on the adhesion of modified polychloroprene used as adhesive

The adhesion properties of polychloroprene can be improved by addition of such materials as piperylene–styrene co-polymer (PSC), VeoVa-10 polymer, VeoVa-11/methyl methacrylate/2ethylhexyl acrylate co-polymer (VeoVa-11/MMA/2EHA) and poly(vinyl acetate) waste (wPVAc). Here, the relationship between adhesion properties and surface tension of polychloroprene was investigated. Contact angle measurements have been used to study the effects of nature and content of polymeric additives on the adhesion and surface properties of polychloroprene. Low-surface-tension VeoVa-10 polymer has the tendency to migrate to the surface of polychloroprene; thus, adhesion is determined mainly by this additive property. Enrichment of polychloroprene film bottom layer by the additive was observed using high-surface-tension PSC and wPVAc. In this case, the adhesion properties of polychloroprene depend on the interactions at the interface. Adhesion properties of polychloroprene were found to depend not only on compatibility between adhesive components, but also on compatibility between the adherend and the adhesive.     

CR-244氯丁橡胶及甲苯胶液色泽的改善

笔者从聚合配方和终止剂体系两个方面入手，介绍了改善CR-244氯丁橡胶及甲苯胶液色泽并能保证其抗老化性能的方法。     

无苯低毒氯丁胶粘剂的研制

选用多种低毒溶剂组成了氯丁胶粘剂的溶剂体系，选择合适的氯丁橡胶、配合剂和工艺制得一种无苯低毒氯丁胶粘剂，并对其剥离强度、贮存性能等进行了考查。该胶粘剂剥离强度高，常温和低温贮存性能良好，而且有害物质含量远远低于已颁布的《室内装饰装修材料胶粘剂中有害物质限量》的国家标准(GB18583-2001)，值得在应用领域推广。     

环保型氯丁胶溶剂体系的研制

文章拟研制一个环保型氯丁胶粘剂溶剂体系。根据溶剂的溶解度参数及氢键指数,综合考虑溶剂对氯丁胶粘剂各种性能的影响,在满足产品粘度及剥离强度的前提下,研制出氯丁胶粘剂的环保溶剂配方。研究确定溶剂成分和配比,以及实验水浴温度,引发剂用量的影响和CR/MMA比值对产品性能的影响。     

水性聚氨酯的改性研究进展

聚氨酯胶粘剂作为一类具有良好性能的高分子材料,在很多领域得到应用。水性聚氨酯胶粘剂的问世,满足了日益严格的环保要求。然而水性聚氨酯胶粘剂的耐水性、耐溶剂性、耐候性等较差。本文介绍了目前国内外水性聚氨酯胶粘剂的研究现状及改性方法:交联改性、环氧树脂改性、有机硅改性、多重改性等,并指出了水性聚氨酯胶粘剂的发展趋势。     

Effects of hydrocarbon tackifiers on the adhesive properties of contact adhesives based on polychloroprene - III. The effect of the molecular weight of the tackifier

Aromatic hydrocarbon resins with different molecular weights (M_w = 1300-50400 daltons) were added to a solvent-based polychloroprene adhesive. The hydrocarbon resins were characterized using infra-red (IR) and differential scanning calorimetry (DSC) measurements. The properties and compatibility of the polychloroprene/resin blends were studied using mechanical tests, DSC measurements, scanning electron microscopy (SEM), and stress-controlled rheology. Tack measurements were also carried out and the adhesion strength was obtained from T-peel tests on roughened styrene-butadiene rubber/polychloroprene adhesive joints. The addition of low-molecular-weight tackifiers produced a compatible polychloroprene/tackifier system (only one T_g was found in DSC measurements), while the addition of a high-molecular-weight (and broad molecular weight distribution) tackifier produced a partially incompatible system (two Tg's were found in DSC measurements). The compatibility of polychloroprene/tackifier blends was also assessed with stress-controlled rheology and SEM. An increase in the T-peel strength and tack were produced when the molecular weight of the tackifier increased, although the addition of a hydrocarbon resin with a M_w higher than about 50 000 reduced the tack. A broad molecular weight distribution in the tackifier favoured incompatibility with the polychloroprene, resulting in a reduction in the tack and rheological properties.     

Improved adhesion of EVAs with different vinyl acetate contents treated with sulphuric acid

Four ethylene vinyl acetate copolymers (EVAs) containing 9, 12, 18 and 20 wt% vinyl acetate (VA) were treated with concentrated sulphuric acid to improve their adhesion to polychloroprene (PCP) adhesive. The tensile strength and Young's modulus of EVAs decreased as the VA content increased, due to the reduction in crystallinity of the polyethylene blocks in the copolymer. The modifications produced in the EVAs by treatment with sulphuric acid were followed using contact angle measurements (water, 25 °C), ATR-IR spectroscopy and scanning electron microscopy (SEM). Adhesive-bond strength was obtained by T-peel tests on treated EVA/polychloroprene adhesive joints. The vinyl acetate content in the EVA affected the extent, but not the nature, of the surface modification produced by treatment with sulphuric acid. The treatment produced both sulfonation and oxidation on the EVA surfaces. The higher the vinyl acetate content in the EVA, the more significant the modifications produced. Increased T-peel strengths of EVA/polychloroprene adhesive + 5 wt% polyisocyanate joints were obtained and a mixed failure (adhesion failure + cohesive failure in the adhesive) was produced. It was found that, to be effective, the treatment of EVAs must be carried out with 96 wt% sulphuric acid.