水溶性酚醛树脂胶的制备

通过改进实验条件制备水溶性酚醛树脂胶，确定了最佳原料配比，提高了产品收率，产品经红外光谱等分析，验证了设计方法的可靠性。     

环保型酚醛树脂粘合剂的研制及粘接性能

对酚醛树脂粘合剂的合成进行了研究 ,采用将甲醛和苯酚在不同反应阶段分批加入的工艺流程 ,使得粘合剂产品在符合粘接性能要求的基础上 ,有效地降低了产品的游离甲醛和制板后甲醛释放量。用该粘合剂粘接的胶合板甲醛释放量不超过 0 .0 5mg·L-1,远远低于国家标准。该粘合剂也适用于竹板的粘接 ,它是一种比较理想的低毒环保型酚醛树脂粘合剂     

对叔丁基酚醛树脂的合成与表征

通过选择不同配比的对叔丁基苯酚和甲醛合成了具有不同摩尔质量的对叔丁基酚醛树脂,对制得的酚醛树脂进行了性能测试。结果表明,单体配比的不同不仅对酚醛树脂的结构、性能有着重要的影响,而且对体系的聚合反应也有一定的影响,当酚/醛物质的量比为8/7时影响较为明显。     

高交联密度酚醛树脂的合成

以较高的甲醛（F）／苯酚（P）比（物质的量之比），采用复合可以得到高交联密度酚醛树脂。树脂合成过程中应严格控制温度；F／P比在1.6和1.8时，合成反应过程平稳，且可以提高酚醛树脂炭化率和玻璃纤维／酚醛树脂复合材料的抗烧蚀性能，适当的催化剂可以缩短反应时间。     

覆膜砂用环保型酚醛树脂的制备

介绍了一种新覆膜砂酚醛树脂的制造工艺,通过与现有工艺比较,采用多种酸三次催化的新方法制备出合格的覆膜砂专用热缩型酚醛树脂。通过大量实验,改变反应原料配比、反应时间、温度及催化剂等条件,在较低工艺要求的条件下,制备出残酚含量低、性能优越的产品,达到节能环保的效果。应用该环保型酚醛树脂制备出覆膜砂的强度比传统工艺制备的产品强度要高。     

何谓水性酚醛树脂胶粘剂?

<正>A酚醛树脂是苯酚或取代苯酚与甲醛的反应产物。改变酚和醛的种类、酚的物质量比、催化剂的种类和用量、反应时间与温度,则反应所生成的产物均不相同。     

酚醛树脂的清洁生产工艺探讨

通过改进酚醛树脂生产现有工艺 ,降低酚醛树脂上层清液中的游离酚、醛的含量 ,降低生产成本 ,结果令人满意     

铸造用酚醛树脂生产中有关技术问题探讨

针对铸造用酚醛树脂类粘结剂生产中出现的产品中苯酚、甲醛、水分含量高，树脂储存稳定性差、产品出现凝胶物等现象，从工艺、设备、操作等方面分析了生产中存在的问题，提出了一些已被生产实践证明的合理的解决方案。     

高温岩棉用水溶性钼酚醛树脂胶的研制

以Ba(OH)2为催化剂,合成了水溶性钼酚醛树脂Mo PF,研究了原料(苯酚、甲醛、钼酸铵和Ba(OH)2)配比、反应温度和时间对合成的影响,并用红外光谱、热重分析和差热分析对所粘接岩棉的结构和耐热性进行考察。结果表明,当m甲醛∶m苯酚∶m钼酸铵=3∶1∶0.54,60℃恒温反应1 h后升温至70℃,并于70℃恒温反应2 h,Mo PF所粘接岩棉的耐热性与纯酚醛树脂(PF)相比有明显提高。初始分解温度为450℃,比PF-岩棉提高190℃;885℃时失重8%,比PF-岩棉减少22%;红外光谱表明,钼元素以钼氧键的形式引入到PF结构中。     

酚醛树脂胶粘剂生产配套设备概述

介绍了酚醛树脂胶粘剂生产配套设备及其相关设施     

降低可发泡性酚醛树脂中游离甲醛含量的研究

研究了酚醛树脂合成条件对树脂中游离甲醛含量的影响。结果表明,反应物甲醛和苯酚的摩尔比为(1.2~2.4)∶1,树脂中游离甲醛的含量为0.12%~11.57%;将整个反应分成两步,在65℃和95℃各加热40 min,使游离甲醛含量更低;催化剂的最适合用量为苯酚摩尔数的6%~9%;游离甲醛含量随尿素用量增大而减小,但存在一个临界值,尿素的最佳用量为甲醛摩尔数的10%~12%。     

尿素改性酚醛树脂胶粘剂的研究

以苯酚、尿素、甲醛为原料采用合理的工艺进行了尿素对酚醛树脂改性,对其可行性进行了初步分析。试验结果表明,所合成的尿素改性酚醛树脂贮存性好;可以在低于酚醛树脂25℃的固化温度下固化;在相同的固化温度下,UPF树脂的固化速度要快于PF树脂;用尿素改性酚醛树脂压制桦木三合板,其所压制的胶合板的各项物理力学性能与常规PF树脂胶合板性能相近,能达到GB/T 9846-1988对I类胶合板理化性能的要求;板材中的甲醛释放量低于GB 18580-2001中的E1级的要求。由于尿素的加入降低了胶粘剂的成本,尿素改性酚醛树脂综合性能优于PF树脂。     

低游离甲醛可发性液态酚醛树脂的制备

以苯酚和多聚甲醛为原料合成可发性液态酚醛树脂,考察了催化剂、甲醛与苯酚摩尔比、反应温度、反应时间和甲醛捕捉剂对酚醛树脂中游离甲醛含量及酚醛树脂黏度的影响。结果表明:以复合催化剂作为催化剂,用量为苯酚质量的5%,采用逐步升温工艺,在60~70℃条件下反应3.0 h,80℃条件下反应2.5 h,添加盐酸羟胺与尿素组成的复合甲醛捕捉剂于80℃继续反应0.5 h,得到的可发性液态酚醛树脂的游离甲醛质量分数为0.12%,黏度为3.97 Pa·s。     

Resol‐type phenolic resin from liquefied phenolated wood and its application to phenolic foam

A liquefied wood‐based resol resin was prepared with excellent yield by a reaction of liquefied wood and formaldehyde under alkaline conditions. The effects of various reaction parameters on the extent of the yield of the resol resin, unreacted phenol content, and viscosity were investigated. Milder resol resinification conditions were required as compared to those used in conventional methods. The liquefied wood‐based resol resin was successfully applied to produce phenolic foam using appropriate combinations of foaming agents. Diisopropyl ether with a relatively higher boiling temperature was suitable for the foaming of liquefied wood‐based resol resin. Hydrochloric acid and poly(ethylene ether) of sorbitan monopalmitate were used as a catalyst and a surfactant, respectively. The obtained foams showed satisfactory densities and compressive properties, comparable to those of foams obtained from conventional resol resin. Foams with low density were obtained by the blending of liquefied wood‐based resol resin and conventional resol resin. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 468–472, 2002; DOI 10.1002/app.10018     

低游离甲醛含量酚醛树脂胶粘剂的合成

采用两次加碱一次回流法合成工艺代替一次法和两次碱法制备了酚醛树脂胶粘剂。对产物粘度,游离甲醛含量及固化物拉伸剪切强度测试,研究了酚醛比、催化剂加入量、反应温度、回流时间等对产物性能的影响。结果表明:苯酚与甲醛物质的量比1∶2,催化剂加入量为苯酚质量分数的25%,回流反应45 min可得到具有交联结构的酚醛树脂胶粘剂,产品分子质量及粘度适中,拉伸剪切强度可达到5 MPa以上,游离甲醛质量分数<0.03%,稳定性较好。     

Reactive compatibilization of a nitrile rubber/phenolic resin blend: Effect on adhesive and composite properties

Resole phenolic resins containing various p-cresol (PC) to phenol (P) mol ratios were prepared and characterized. These phenolic resins were blended with nitrile rubber (NBR) and the measurements of adhesive joint strength, stress–strain properties, DSC, TGA, DMA, TEM, and SEM were performed using a 50 : 50 NBR/phenolic resin blend. It was observed that the adhesive joint strength and the mechanical properties of the blend enhanced significantly on incorporation of p-cresol into the phenolic resin, and the optimum p-cresol/phenol mol ratio was in the vicinity of 2 : 1. Observation of a more continuous phase and the increase in T_g of the rubber region in the blend indicated increased reactivity and compatibilization of NBR with phenolic resin as p-cresol was incorporated. The effect of silica filler on the properties of the nitrile rubber/phenolic resin blend was also studied without and with p-cresol modification and the results suggest that silica filler take not only the role of a reinforcing filler in the nitrile–phenolic–silica composite, but also a role as surface compatibilizer of the blend components. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1187–1201, 1998     

木素基酚醛树脂胶粘剂的应用性能研究

采用热化学酚化技术活化木素得到木素酚化产物,以酚化产物代替苯酚制备低成本的木素酚化液基酚醛树脂(LPF)胶粘剂。采用红外光谱(FT-IR)对LPF和传统PF的结构进行了表征,通过对比试验分析了LPF的应用性能,并对LPF胶粘剂应用性能产生的机理作了一定的探讨。结果表明:酚化后的木素参与了LPF胶粘剂的合成,并具有新的不同取代基的苯环结构;LPF胶粘剂与传统酚醛树脂(PF)胶粘剂具有相似的应用性能,前者比后者具有更低的游离酚(醛)含量(游离酚<0.12%,游离醛<0.08%)、更快的干燥速率和更低的施胶量(固含量29%时施胶量为297g/m2);另外,LPF胶粘剂具有优异的胶合性能(达到了Ⅰ类胶合板的标准要求)和储存稳定性,完全满足高性能环保型胶粘剂的使用要求。     

钼酚醛树脂基结构胶粘剂的研究

用耐热性较好的钼酚醛树脂作基料合成了结构胶粘剂。实验结果表明 ,胶粘剂室温下剪切强度达2 8MPa以上 ,耐热性得到了提高     

Flexural properties of phenolic resin reinforced with glass powder: Preliminary results

Phenol formaldehyde was filled with glass powder to increase its flexural strength for civil and structural applications by a research centre on composites, University of Southern Queensland (USQ). To reduce costs, the centre wishes to fill in as much glass powder as possible subject to maintaining sufficient strength of the composites in structural applications. This project varies the percentage by weight of the glass powder in the composites from 5 to 30%. The specimens were then subjected to flexural tests. The results show that composite with 17.5% by weight of the glass hollow spheres produces the highest flexural strength and flexural modulus combined with a very good fluidity for casting. The maximum flexural strain was achieved with pure resin. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010