共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
3.
以叠氮聚醚、癸二酸二辛酯、1,4-丁二醇、白炭黑、甲苯二异氰酸酯等为原材料,制备了叠氮聚醚聚氨酯胶粘剂。了原材料的用量变化对胶粘剂粘接强度的影响。对于不同的丁二醇或TDI用量,测试了胶粘剂在室温下不同时间的粘度。对粘接试件进行了70℃老化试验。试验结果表明,改变癸二酸二辛酯、白炭黑、1,4-丁二醇用量和异氰酸酯指数都将影响胶粘剂性能。当叠氮聚醚用量100g,癸二酸二辛酯20g,白炭黑5g,1,4-丁二醇与叠氮聚醚的羟基摩尔比值为3,异氰酸酯指数为1.15时,可以获得粘接强度优良的叠氮聚醚聚氨酯胶粘剂。 相似文献
4.
研制了一种高初粘性聚氨酯胶粘剂,其室温施工不需活化、固化快、强度高,耐水、耐海水等。特别适用于橡胶复合阻尼材料与钢的粘接。 相似文献
5.
6.
研制出一种具有较高初粘性的双组分胶粘剂,并对其配比,涂胶时间和温度、涂胶次数等影响粘结强度的因素进行了研究,将到其适应宾配比为ω(A):ω(B)=100:5-10(最好为100:7-8),活化条件40-60℃,活化时间10min-15min。在此条件下,该胶粘剂对各种鞋用材料的粘合均显示出较高的初粘性(剥离度大于100N/2.5cm)及终粘力。用此胶粘剂进行帮底粘接后,其剥强度在1h内即右国家GF 相似文献
7.
采用溶液法合成纸,塑复合用的端NCO基聚醚型单组分聚氨酯胶粘剂。其特点是在溶剂中将聚醚二醇,两种活性不同的扩链剂与TDI反应,然后再加溶剂稀释成固含量60%的胶粘剂,进行了工艺条件对胶粘剂性能的影响试验。 相似文献
8.
以NA-5型氨酯胶粘剂作为金属五PU弹性胶料之间的胶粘剂,制作钢/PU橡胶/铝静件。研究了影响制件粘接强度的主要因素,给出了NA-5最佳粘接工艺。 相似文献
9.
10.
11.
Influence of wood extractives on two-component polyurethane adhesive for structural hardwood bonding
ABSTRACTWhen bonding wood for structural applications, the wood–adhesive bond is influenced by a variety of factors. Besides the physical and mechanical properties of wood species, their chemical composition, e.g. wood extractives, can play a role in bonding wooden surfaces. A two-component polyurethane system (2C PUR) was chosen to better adapt to the current adhesion problem. The influence of extractives on crosslinking was determined by Attenuated Total Reflection-Fourier Transform Infrared Spectrometer (ATR-FTIR) and on the rheological behavior in terms of gel point and storage modulus. Therefore, 2C PUR was mixed with 10% of eight common wood extractives separately. Furthermore, the mechanical properties of beech wood (Fagus sylvatica L.) bonded with extractive enriched adhesive were tested by means of tensile shear strength tests and evaluation of wood failure. These results of ATR-FTIR clearly show that the majority of crosslinking was terminated after 12 hr. Acetic acid and linoleic acid expedited the isocyanate conversion during the first 2.5 hr. The curing in terms of gel point and storage modulus of 2C PUR was accelerated by starch, gallic acid, linoleic acid, and acetic acid. Heptanal, pentanal, 3-carene, and limonene decelerated the curing. All extractives lowered the storage modulus determined after 12 hr. The bonding of beech wood with extractive–adhesive blends showed a slight decrease of the mechanical properties, with the exception of a marginal increase in the case of linoleic acid and pentanal.In summary, it can be said that 2C PUR is sensitive to the influence of wood extractives and can therefore be partly held responsible for adhesion problems occurring when extractives in surface-wide and higher contents are available. 相似文献
12.
以结晶性聚酯多元醇、直链二醇扩链剂、异氰酸酯和纳米助剂等为主要原料,制备出一种高粘接强度、耐老化性能优良的车身反光贴用PU(聚氨酯)胶粘剂。分析了聚酯多元醇的种类及其Mr(相对分子质量)、扩链剂、异氰酸酯、纳米助剂和催化剂等对PU胶粘剂性能的影响。结果表明:当结晶性聚酯多元醇为Mr=3 000的聚己二酸-1,4-丁二醇酯、扩链剂为1,6-己二醇(HDO)、异氰酸酯为1,6-己二异氰酸酯(HDI)、催化剂为有机铋类(BiCAT 8108)且w(催化剂)=0.03%(相对于反应物总质量而言)、n(聚酯多元醇)∶n(扩链剂)=1∶0.3和w(气相白炭黑)=0.2%~0.3%(相对于反应物总质量而言)时,PU胶粘剂的综合性能相对最好。 相似文献
13.
14.
以聚醚多元醇、聚酯多元醇和蓖麻油为混合多元醇,以改性MDI(4,4′-二苯基甲烷二异氰酸酯)及PAPI(多亚甲基多苯基多异氰酸酯)为混合异氰酸酯,合成了聚氨酯(PU)胶粘剂预聚体;然后以PA(羟基丙烯酸酯树脂)作为PU预聚体的改性剂,制得高固含量的PUA(聚丙烯酸酯改性聚氨酯)胶粘剂。结果表明:当m(改性MDI)∶m(PAPI)=1∶1、n(-NCO)∶n(-OH)=2.2∶1、w(PA)=8%(相对于PU质量而言)和w(丙烯酸羟乙酯)=3%(相对于PU质量而言)时,PUA胶粘剂的综合性能较好。 相似文献
15.
16.
17.
A complete system for the structural bonding and final sealing of plastic or metal assemblies, consisting of a two-part polyurethane which cures at ambient temperatures, is described. 相似文献
18.
以MDI与聚醚为原料,乙二醇为固化剂,在催化剂的作用下合成聚氨酯粘结剂.并进行了红外表征,测定了异氰酸根含量与粘结硝酸铵后的吸水性能,同时考察了反应温度、反应时间、-NCO与-OH物质的量之比以及催化剂用量对粘结体吸湿性的影响。正交实验结果表明:当-NCO与-OH物质的量比为1.5:1,反应温度为70%,反应时间为1.5h,催化剂用量为羟基含量的0.1%时,粘结体耐水性最佳,粘结硝酸铵达80%。 相似文献