玻璃钢化季节性调压数值模拟

建立了风栅中玻璃的冷却模型,数值模拟玻璃冷却的温度和应力变化规律,反演了不同季节风温时的合理匹配风压。结果表明,在玻璃淬冷过程,约3 s时玻璃表面拉应力达到最大,若该应力大于玻璃此时的抗拉强度,玻璃将破裂。此后玻璃从外到内降温速率逐渐减小,在约15~17 s时玻璃表层受内部影响减弱,表面应力趋于稳定。与钢化玻璃表面应力测试结果相比,数值模拟结果略小,但相对误差不超过5%。随冷却风温降低,玻璃钢化所需的风压逐渐减小。在玻璃钢化程度接近的情况下,风压随风温降低近似线性减小,钢化风压调节量与环境温度变化量的相关系数为0.103 kPa/K。     

水平及弯曲玻璃钢化机组传动系统的几种方案

玻璃钢化就是通过特定的工艺过程和装备，提高玻璃机械强度的一种方法，其特点是玻璃的抗弯曲强度、耐冲击强度、耐热冲击强度显著提高，破碎时先出现网状裂纹，破碎后成不具有锐角的小碎块，较普通玻璃具有不伤人的安全性。在早些时候，大都采用垂直吊挂法生产钢化玻璃，由于其生产装备简单、生产灵活、产品规格多样等特点，曾是我国生产钢化玻璃的主要方法，但其生产率低、产品质量低、能耗高、产品规格小的局限性，已越来越不适应当今科技发展速度和生活水平的需要，目前基本被水平钢化工艺代替。本文将介绍水平钢化机组传动系统的几种方案。     

TiO2薄膜玻璃钢化后光照超亲水性的研究

采用无机钛盐硫酸氧钛为原料,在玻璃基片上获得TiO2超亲水性涂层后,在680℃对玻璃基片进行了钢化处理.实验表明,该TiO2涂层在钢化后仍具有均匀的表面结构、高的可见光透过率和良好的光照超亲水效果,从而在玻璃建材行业具有广泛的实际应用前景.     

国外几种弯钢化,弯夹层玻璃设备比较

介绍世界上几家著名公司的弯钢化，弯夹层玻璃加工设备的性能及特点，为我国玻璃行业进行玻璃深加工设备的选型提供借鉴。     

薄玻璃的钢化技术

薄的钢化玻璃，特别是厚度在3mm以下的钢化玻璃，正越来越多地应用于许多领域。本文简单介绍了薄玻璃的各种钢化方法，并就有效地提高薄玻璃的钢化成品率改善钢化工艺方法、钢化设备的设计等方面进行了探讨。     

几种特种玻璃钢化的一点经验

1 前言 玻璃是一种常见的、普遍使用的建筑装饰材料,能有效地减轻建筑物本身的自重,并且增强建筑物的装饰美感.随着人们生活水平的提高、科学技术的发展和社会的进步,人们对玻璃的要求越来越趋于多样化、功能化、绿色化,各种功能的玻璃深加工产品,如蒙砂玻璃、彩釉玻璃、镀膜玻璃、低辐射玻璃(Low-E玻璃)、压花玻璃等逐渐受到人们的青睐,而这些新品种玻璃的钢化增强处理也是必要的.我国部分城市已颁布实施了高层建筑的外窗玻璃必须使用安全玻璃的规定.这里简要介绍几种特殊品种玻璃钢化生产的一点经验.     

薄钢化玻璃的生产

本文主要论述了利用垂直吊挂机组，在主机不变的情况下采用物理法生产４ｍｍ薄坪弯钢化玻璃的理论依据技术方案和生产实践。     

钢化玻璃应力斑的成因分析及控制

分析了钢化玻璃产生应力斑的原理，论述了钢化玻璃生产过程中导致应力斑产生的工艺原因，介绍了影响应力斑视觉效果观察入射角、玻璃厚度等非玻璃本身因素。     

平板玻璃钢化有限元数值模拟

用非线性有限元分析方法,建立了玻璃的热粘弹性应力松弛数学模型、Narayanaswamy结构松弛数学模型以及热边界模型,对平板玻璃钢化过程进行三维仿真模拟,得到玻璃中心和边界区域的温度与应力的变化历史及分布.为优化设计平板玻璃钢化参数提供了依据,能缩短产品开发周期、降低成本并保证产品质量.     

环氧树脂增韧新途径及增韧机理的研究

介绍了环氧树脂通过共聚共混法增韧改性的一些新方法,包括热塑性树脂增韧、互穿网络聚合物增韧、热致液晶聚合物增韧、刚性高分子增韧、核壳结构聚合物增韧等,并分别对其增韧机理作了总结分析。     

改性聚芳醚酮增韧环氧树脂研究

以改性聚芳醚酮(PAEK)为增韧剂对环氧树脂进行改性。通过冷场发射扫描电镜分析和冲击强度测试研究了PEAK用量对PAEK/EPOXY浇注体冲击性能的影响及其增韧机理。结果表明,纯环氧和质量分数分别为5%、15%、25%、35%和50%的6种共混浇铸体的冲击强度分别为1.92 MPa、2.97 MPa、3.06 MPa、4.63MPa、4.69 MPa以及5.36 MPa,体系的冲击强度随PAEK含量增加而提高。随PAEK用量增加,PAEK/EPOXY共混体系主体呈现为海岛-双连续相-相反转逐步过渡微观结构,这影响了共混树脂体系的冲击裂纹扩展模式,从而使得冲击性能上升。     

环氧树脂建筑结构胶粘剂增韧改性研究

采用改性环氧树脂和添加增强填料等方法,提高胶粘剂的力学性能,增强其柔韧性。通过对比试验得出了玻璃纤维作为填充剂在胶粘剂中的合理含量,为其在粘接领域的应用提供了基础数据．     

Epoxy toughening using low viscosity liquid diglycidyl ether of ethoxylated bisphenol‐A

Two new epoxy resins, diglycidyl ether of ethoxylated bisphenol‐A (BPA) with two and six oxyethylene units (DGEBAEO‐2 and DGEBAEO‐6) were synthesized and characterized. DGEBAEO‐6 was used to toughen the conventional epoxy resin diglycidyl ether of BPA (DGEBA). The blends of DGEBA with different amounts of DGEBAEO‐6 were cured by 4,4′‐diamino diphenylmethane (DDM), and their thermal and mechanical properties were examined. The DSC and DMA results presented that DGEBA/DGEBAEO‐6 blends exhibited a homogenous phase, and the glass transition temperature of the blends was inversely proportional to the content of DGEBAEO‐6. The impact strength of the cured blends was directly proportional to the content of DGEBAEO‐6, and reached five times higher than that of the neat DGEBA when 50 wt % DGEBAEO‐6 was used; the same impact strength was achieved for DDM‐cured DGEBAEO‐2. The viscosities of the blends decreased with increasing the DGEBAEO‐6 content, whereas the tensile and flexural strength and the thermal stabilities were not obviously affected. Scanning electron microscopic results confirmed that the plastic deformation inducing by the incorporated flexible oxyethylene units was responsible for the toughness improvement. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Rubber toughening of an amorphous polyamide by functionalized SEBS copolymers: morphology and Izod impact behavior

Rubber toughening of an amorphous polyamide (Zytel 330) using combinations of triblock copolymers of the type SEBS and a maleic anhydride functionalized version, SEBS-g-MA, was investigated and the results compared with those of nylon 6 and nylon 66. The effects of rubber content and the type of extruder on the morphology, Izod impact behavior and the ductile-brittle transition temperature were explored. The shape and sizes of the rubber particles in blends with this amorphous polyamide were found to be more similar to those in nylon 6 than in nylon 66 blends. The twin screw extruder produced smaller particles with a more narrow distribution of sizes than the single screw extruder. Higher rubber contents generally yielded tougher blends; there is a critical rubber particle size above which the ternary blends are brittle at 20 wt% total rubber. The ductile-to-brittle temperature was found to decrease with increased rubber content and decreased rubber particle size. In general, the trends for this amorphous polyamide are rather similar to those reported earlier for semi-crystalline nylon 6 and nylon 66.     

我国硬质聚氯乙烯增韧改性的进展

介绍了国内增韧聚氯乙烯的材料种类，特点，增韧机理，效果及研究现状。     

环氧树脂胶粘剂增韧改性的研究进展

综述了近几年环氧树脂胶粘剂增韧改性研究的现状,介绍了各种增韧机理及应用。     

韧性马来酰亚胺树脂的合成

文中介绍了三类新型的马来酰亚胶树脂——甲基取代双马来酰亚胺、环氧型双马来酰亚胺树脂及本征增韧型马来酰亚胶树脂。对其树脂、固化树脂及其复合材料的性能进行了详细的研究，得到了性能较佳的树脂体系。     

茂金属聚乙烯弹性体和三元乙丙橡胶增韧聚丙烯的比较

用茂金属聚乙烯弹性体（mPE）代替三元乙丙橡胶（EPDM）对聚丙烯（PP）增韧改性并进行了比较。结果表明,mPE共聚物中的辛烯质量分数越高,其中对PP的增韧效果越好;随着共混物中弹性体质量分数的增加,共混物的拉伸强度和弹性模量降低,扯断伸长率增大。PP/mPE与PP/EPDM增韧体系相比,二者的拉伸强度差别不大,但PP/mPE的弹性模量和扯断伸长率稍低;与EPDM相比,mPE对PP具有较好的增韧效果,含有质量分数40% mPE的共混物试样在-30℃下的缺口冲击强度已超过纯PP的20倍,约是相同弹性体质量分数PP/EPDM的近9倍。另外,PP/mPE还具有较低的拉伸永久变形、压缩永久变形和蠕变变形。     

Interaction of toughening mechanisms in a hybrid epoxy system

Interaction between different toughening mechanisms is studied using a heat treated hybrid system, consisting of carboxyl‐terminated butadiene acrylonitrile (CTBN) rubber and EXPANCEL (expandable hollow microspheres) as modifiers for an epoxy resin. It was found that the fracture toughness of the hybrid system is higher than that of either individually EXPANCEL‐ or CTBN‐modified system for a given content of modifier, although the maximum toughness was not substantially high compared with maxima of single modifier systems. Microscopic examination revealed that damage zone due to CTBN particles ahead of the crack reduces due to the presence of EXPANCEL particles and nevertheless its fracture toughness increased. A possibility was deduced that the cavitation due to CTBN assists with promoting compressive stresses around EXPANCEL particles ahead of the crack tip, resulting in increase in fracture toughness. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4470–4475, 2006