交联改性水性聚氨酯的合成及在半PU面层中的应用

发布时间：2018-06-13 22:38

  本文选题：半PU合成革 + 聚碳酸亚丙酯　； 参考：《合肥工业大学》2017年硕士论文

【摘要】：半PU合成革是近十年来发展的一种新型合成革制品,它是在普通PVC合成革的基础上,以PVC糊树脂为中间发泡层,再以聚氨酯(PU)为面层,同时采用PU贴合料与基布复合,这种复合材料的结构寄保留了 PU材料的手感、耐磨、耐候的优良性质,而PVC占到80wt%以上,组合了 PU/PVC两种不同材料的优点。然而目前国内外公开的专利大多数是以聚醚多元醇、聚己二酸系列聚酯多元醇和多异氰酸酯为合成原料,其合成原料反应复杂,需要昂贵的催化剂,且常温下为蜡状,生产时需预先加热,无疑增加工序与能耗。因此寻找一种常温下易于加工、新型环保的低聚物多元醇为主要原料,通过化学改性方法制备出综合性能优良的水性聚氨酯乳液,并应用于半PU面层材料,是本文的研究指向。本课题以异佛尔酮异氰酸酯IPDI,非结晶性聚碳酸亚丙酯二醇PPC,阴离子型亲水扩链剂2,2-二羟甲基丙酸(DMPA),内交联剂三羟甲基丙烷(TMP)及中和剂三乙胺(TEA)为主要原料,以环氧树脂(E-44)为交联改性剂,通过自乳化法制备出一种改性内交联型WPU乳液;乳液及胶膜通过红外、激光粒度仪、拉力试验机测试,表征了 WPU的化学结构、乳液粒径、胶膜力学性能。结果表明:交联改性后的PPC-WPU热稳定性、贮存稳定性均有所提高,当R值(n(-NCO) /n(-OH)) =1.5 左右,DMPA 含量在 7.8%,E-44 含量为 4%, TMP含量2%时,所得涂膜的100%模量为6.4MPa,拉伸强度36.8MPa,断裂伸长率630%,吸水率为9.8%。将改性内交联型WPU乳液应用于半PU面层材料时,一些水性助剂的添加必不可少,以满足不同的产品性能。本课题采用离型纸转移法刮涂面料,对半PU面层材料的主要助剂及浆料配方做了相应讨论。结果表明:0.5-1.0%的消泡剂 F6、0.75%的流平剂 F3、0.5-1.0%的助剥剂 SI-2046、0.5-1.0%的增稠剂 Ps-166、5-8%的水性颜料与WPU乳液配伍良好,E-44改性的内交联型聚碳酸亚丙酯基水性聚氨酯乳液制备的半PU面层树脂,具有更佳的耐磨耐折、耐水耐热性能,转移时对离型纸表面无损伤。经温度70℃C、湿度95%/168H恒温恒湿条件测试后,性能保持率高,是符合企业要求的新型水性半PU合成革制品。
[Abstract]:Semi-pu synthetic leather is a new kind of synthetic leather product developed in recent ten years. It is based on ordinary PVC synthetic leather, taking PVC paste resin as intermediate foaming layer and polyurethane PUU as surface layer. The structure of the composite retains the excellent properties of pu material, such as handle, wear resistance and weathering resistance, while PVC accounts for more than 80 wt%, which combines the advantages of two different materials, PU/ PVC. However, most of the patents published at home and abroad use polyether polyol, polyadipic acid series polyester polyol and polyisocyanate as raw materials. Production needs to be pre-heated, no doubt increase the process and energy consumption. Therefore, it is the research direction of this paper to find a new type of environmentally friendly oligomer polyol, which is easy to process at room temperature, and to prepare the waterborne polyurethane emulsion with good comprehensive properties by chemical modification method and apply it to the semi-pu surface layer material. In this paper, isophorone isocyanate IPDIA, non-crystalline polypropylenediol carbonate (PPCs), anionic hydrophilic chain extender 2-dimethylolpropionic acid (DMPAA), internal crosslinking agent trimethylolpropane (TMP) and neutralizer triethylamine (tea) were used as main raw materials. A modified internal crosslinked WPU emulsion was prepared by self-emulsifying method with epoxy resin E-44) as crosslinking modifier. The chemical structure and particle size of WPU were characterized by IR, laser particle size analyzer and tensile force tester. Mechanical properties of the film. The results showed that the thermal stability and storage stability of the modified PPC-WPU were improved. When the content of DMPA was about 1.5% and the content of TMP was 4%, the content of TMP was 2%. The 100% modulus of the film is 6.4 MPA, the tensile strength is 36.8 MPA, the elongation at break is 630 and the water absorption is 9.8. When the modified internal crosslinked WPU emulsion is applied to the semi-pu surface layer, the addition of some waterborne additives is necessary to meet the different properties of the product. In this paper, the main auxiliary agents and slurry formula of semi-pu surface material are discussed. The results showed that the semi-pu surface layer resin prepared by WPU emulsion was well compatible with WPU emulsion and WPU emulsion, which was prepared by leveling agent F3N 0.5-1.0% SI-2046U 0.5-1.0% thickener Ps-1665-8% and WPU emulsion modified by WPU emulsion. With better wear resistance, water resistance and heat resistance, no damage to the surface of the release paper. After temperature 70 鈩，

本文编号：2015766