约翰斯曼维尔推出聚氨酯SBS防水卷材

<正>约翰斯曼维尔公司近期推出自粘聚氨酯体SBS防水卷材,这种SBS防水卷材产品具有抗拉和抗穿刺性能,用于需要两层或多层的低坡屋面系统。该SBS防水卷材的特点是带自粘底层和面层,带粒     

楼房屋面施工与新型防水技术的应用

介绍了楼房屋面防水施工工序及新型防水技术－SBS改性沥青防水卷材的应用,经过几年的实际应用表明：该技术具有提高防水质量,延长屋面防水年限,方便施工,提高工作效率,缩短工期的特点。     

SBS防水卷材施工要点及质量控制研究

随着建筑工程功能的不断增多和规模不断扩大,全面做好建筑工程防水工作非常关键。在建筑工程防水施工的过程中,选择使用SBS防水卷材施工对于提高防水施工质量非常关键,本文从SBS防水卷材施工要点分析入手,针对性提出了提升SBS防水卷材施工质量的相关控制措施。     

一种多功能三元乙丙橡胶卷材

<正>本实用新型公开了一种多功能三元乙丙橡胶卷材,其特征在于,包括:SBS双面自粘防水卷材层,设置在SBS双面自粘防水卷材层上的三元乙丙橡胶防水卷材层,设置在三元乙丙橡胶防水卷材层上的绝缘层,设置在绝缘层上的缓冲层;SBS双面自粘防水卷材层的宽边一侧延伸形成搭接边,搭接     

一种多功能三元乙丙橡胶卷材

<正>本实用新型公开了一种多功能三元乙丙橡胶卷材,其特征在于,包括:SBS双面自粘防水卷材层,设置在SBS双面自粘防水卷材层上的三元乙丙橡胶防水卷材层,设置在三元乙丙橡胶防水卷材层上的绝缘层,设置在绝缘层上的缓冲层;SBS双面自粘防水卷材层的宽边一侧延伸形成搭接边,搭接     

国外建筑橡胶基防水材料新进展

1概况欧洲的屋面防水材料主要包括改性沥青卷材、单层聚合物片材及氧化沥青油毡三大类。其中改性沥青占统治地位,单层聚合物片材呈持续增长之势,氧化沥青油毡则迅速减少。改性沥青防水卷材主要包括SBS和APP改性沥青卷材两类,弹性体(SBS)改性沥青卷材的用量多于弹性体(APP)改性沥青卷材,近年来,SBS的销售量约在欧洲屋面市场中占41%。在欧洲的单层聚合物片材中,目前PVC片材仍占主导地位,但EPDM(乙丙橡胶)片材则稳定地占有一定的比例,特别值得指出的是,TPO(热塑性聚烯烃)片材发展很快,2004年在屋面市场中已达到857万m2。据NRCA提供…     

产品开发

开发单层屋面防水材料前景好 单层屋面材料与叠层屋面材料相比，具有节省材料和能源，施工效率高、寿命长等优点，是未来屋面防水材料及技术的发展方向。其中聚氯乙烯、热塑性聚烯烃、三元乙丙橡胶等高分子防水卷材的性能最佳。我国近年来已充分认识到发展单层屋面的必要性。已采取措施和出台政策推动其发展，住建部发布公告明确聚氯乙烯（PVC）和三元乙丙橡胶（EPDM）防水卷材为推广材料，因此其开发生产前景美好。     

屋面女儿墙根部裂缝原因分析

当建筑物的女儿墙设计为砖砌体结构,并且屋面防水层设计为SBS改性沥青卷材时,女儿墙的根部出现裂缝成为必然。本文就是裂缝的原因进行分析,以供参考。     

用于PVC防水卷材的乙烯共聚物改性胶的研究和应用

聚氯乙烯(PVC)防水卷材具有价格适中、阻燃、原材料来源丰富等优点,国内外已普遍将其应用于屋面防水,但该卷材属于难粘结材料。本研究表明,乙烯共聚物改性胶是粘结PVC防水卷材的理想胶粘剂。     

屋面防水施工质量影响因素及对策分析

屋面防水设计及施工质量会直接影响房屋建筑后期的使用性能。设计方案、屋面结构、管理水平是影响屋面防水施工质量的主要因素。通过实际工程案例说明：只有重视分格缝设计与施工、防水卷材的铺设、混凝土的抗收缩性能、女儿墙的防水施工、质量的验收，才能提高屋面防水施工质量。     

The influence of adhesive viscosity and elastic modulus on laser spot weld bonding process

Laser spot weld bonding (LSWB) is a novel joining technology, which combines laser spot welding with a layer of structural adhesive in a single joint. The purpose of this paper is to investigate the effect of the adhesive properties on the joining process, the peel and the shear strength of the LSWB joints. The present work demonstrates that the adhesive viscosity has great influence on the vaporized adhesive gas exhaust process, and the low viscosity is good for the exhaust process. The mechanical test result shows that the tension–shear load of LSWB joint isn׳t always higher than that of the adhesive bonded joint, and LSWB joint with high elastic modulus of adhesive may get the same tension–shear load as the adhesive bonded joint gets. The reaction zone produced by the carbon diffusion between the adhesive and the metal sheet will influence the mechanism of LSWB joint.     

三元乙丙防水片材接缝胶粘剂

研制了一种单组分三元乙丙防水片材接缝用接触型胶粘剂。该胶粘剂以改性溴化丁基橡胶为主体材料,具有很高的粘合强度,优异的耐水性和耐候性,该胶粘剂的储存稳定性也令人满意。     

The effect of primers on adhesive properties and strength of adhesive joints made with polyurethane adhesives

The paper presents selected aspects of the effect of primers on adhesive properties and strength of aluminium sheet adhesive joints, made using polyurethane adhesives. The strength of adhesive joints was determined based on two cure time variants: 15 and 64 h. It was found that the longer cure time at a humidity of 33% is more desired, as it leads to a substantial increase in strength of the tested adhesive joints. In addition, two variants of surface preparation were applied: degreasing and degreasing followed by the application of a primer (a pro-adhesive agent). It was observed that the primer application prior to the application of an adhesive leads to a significant increase in strength compared to the variant where the adhesive application is preceded only by degreasing. Moreover, the aluminium sheet surface that was subjected to cataphoretic painting and priming exhibits better adhesive properties. It has a higher value of both surface free energy and its dispersion and polar components compared to the surface that was only subjected to degreasing.     

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。     

A reinforcing technique for the adhesive bonded composite joints using metallic wires

One of the strengthening methods of composite connection is the employment of reinforcing elements in the adhesive layer. Using of additional elements in the adhesive layer make uniform stress distribution and improves the strength and toughness of the connection. In this paper, metal wires were used to reinforce the adhesive joints of composites. The effects of the number of wires, wire diameter, wire stiffness, angle of wire and the adhesive type on the strength of the adhesive reinforced bonded composite joints were investigated experimentally and numerically. A finite element model was developed to study the stress distribution in the reinforced adhesive joints. The numerical results showed a good agreement with the experimental observation. It was found that increasing the number of wires and wire diameter, choosing a stiffer material for the wire and increasing the wire angle, uniform the stress distribution and reduced the maximum and average stress values in the adhesive layer. For the appropriate reinforcing wire parameters, the joint strength increased more than 90% in this study. It also observed that the using metal wires as a reinforcing element was more effective in the ductile adhesion than the brittle ones.     

房屋建筑屋面工程的防水技术措施

房屋建筑屋面防水层直接经受外界自然环境变化的影响,对防水材料的各项性能指标要求甚高,沥青油毡、改性沥青等传统的防水材料有污染,易老化、易开裂、耐候性差,以至于经常出现屋面渗漏现象,造成严重的经济财产损失,成为建筑工程质量通病,严重影响建筑物的使用寿命。而固凝(GT)防水涂膜以多种高分子材料为主体,经过多种助剂改性,具有良好的适应性。本研究以固凝(GT)防水涂膜为例,探索新型防水材料在建筑屋面工程中应用的技术措施。     

PVC用UV固化聚氨酯丙烯酸酯胶粘剂的研究

采用聚氨酯丙烯酸酯预聚体,添加光引发剂、活性稀释剂、增塑剂及偶联剂等制成PVC用UV固化胶粘剂。结果表明,当活性稀释剂质量分数为20％-25％,且mHDDA：mTGPDA：mPO3TMPTA=2：2：1、硅烷偶联剂质量分数为3％-5％、光引发剂用量为3％～5％,且m1173：m184=1．0：1．5时,用自制表面处理剂对PVC进行处理,胶粘剂粘接的剪切强度为15MPa．综合性能较好。适合于软质PVC的粘接。     

Synergistic fire-retardancy properties of melamine coated ammonium poly(phosphate) in combination with rod-like mineral filler attapulgite for polymer-modified bitumen roofing membranes

A novel intumescent (carbonization, acid donor and foaming) fire retardant that mimics carbon nanotubes was introduced into bitumen roofing and characterized using cone calorimetry as the main analytical tool. The experimental results indicate that 18% (by mass) attapulgite mineral (ATTP) mixed with base bitumen decreased the peak heat release rate per unit area (pHRRPUA) by 10%. Further, incorporation of melamine coated ammonium polyphosphate (MAPP) decreased the pHRRPUA by 52% and a mixture of these (3:1, ATTP:MAPP) decreased the pHRRPUA by 25% as compared to adding CaCO₃ as a filler. The residual mass loss after the cone test was also improved with up to 3%. The indication of a positive synergistic flame retardant effect of the ATTP-MAPP mixture is supported by thermogravimetric analysis. The addition of this rod-like mineral improved the general fire retardant properties of the base bitumen and increased the viscosity. Therefore, the polymer-modified bitumen with both fire retardant and rheological properties (providing mechanical strength) is a promising novel approach in the design of bitumen roofing membranes.     

SIS改性EVA热熔胶的研制

用少量SIS对EVA热熔胶进行共混改性,再与石蜡、萜烯树脂混熔制成SIS改性热熔胶。结果表明,当SIS质量分数为6%~8%时,除胶的剪切强度有所下降外,其剥离强度、柔韧性和热性能均得以提高。     

Atmospheric plasma modification of polyimide sheet for joining to titanium with high temperature adhesive

This investigation highlights the rationale of adhesive bonding of atmospheric pressure plasma treated high temperature resistant polymeric sheet such as polyimide sheet (Meldin 7001), with titanium sheets. The surface of polyimide (PI) sheet was treated with atmospheric pressure plasma for different exposure times. The surface energy was found to increase with increase in exposure time. However, longer exposure time of plasma, results in deterioration of the surface layer of PI resulting in degradation and embrittlement.Contact angle measurements with sessile drop technique were carried out for estimation of surface energy. SEM (EDS) and AFM analyses of treated and untreated specimens were carried out to examine the surface characteristics and understanding morphological changes following surface treatment. Untreated samples and atmospheric pressure plasma treated samples of polyimide Meldin 7001 sheet were bonded together as well as with titanium substrates to form overlap joints. Single lap shear tensile testing of these adhesively bonded joints was performed to measure bond strength and to investigate the effect of surface treatment on adhesive bond strength. An optimized plasma treatment time results in maximum adhesive bond strength and consequently, this technology is highly acceptable for aviation and space applications.