文章摘要
刘帅.封闭型无溶剂聚氨酯的制备及性能研究[J].精细化工,2019,36(6):
封闭型无溶剂聚氨酯的制备及性能研究
Preparation and Properties of Blocked Solvent – free Polyurethane
投稿时间:2018-11-14  修订日期:2019-02-21
DOI:
中文关键词: 封闭型SFPU,封闭剂,封闭率,解封温度,固化条件,成膜性能,皮革化学品
英文关键词: blocked SFPU, sealer, blocking ratio, deblocking temperature, curing conditions, film forming properties, leather chemicals
基金项目:国家高技术研究发展计划(863计划)
作者单位E-mail
刘帅 陕西科技大学 1351534535@qq.com 
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中文摘要:
      以氢化苯基甲烷二异氰酸酯(H12MDI)和聚酯二醇2000为主要原料,分别以甲乙酮肟(MEKO)和己内酰胺为封闭剂,以二月桂酸二丁基锡(DBTD)为催化剂,采用预聚体封闭法制备封闭型无溶剂聚氨酯(SFPU)膜。采用TGA和DSC考察了封闭型SFPU膜的解封温度和热性能;探究了不同封闭剂、流平剂用量、催化剂用量、烘箱温度以及封闭率对封闭型SFPU的解封温度、封闭型SFPU的固化条件和成膜性能的影响。结果表明:通过DSC测试,以MEKO作为封闭剂的SFPU的解封温度为143℃,以己内酰胺为封闭剂的SFPU的解封温度为163℃。TGA分析表明,在相同的解封温度下,以MEKO作为封闭剂的SFPU的固化速度明显高于以己内酰胺作为封闭剂的SFPU。在烘箱温度为140℃、流平剂质量分数为5%、催化剂质量分数为5‰的情况下,闭型SFPU能够很好地固化成膜,而且封闭型SFPU的封闭率越低、固化温度越高,其开始成膜时间和完全固化时间越短;由75%、80%、85%、90%、95%、100%6个封闭率可知,膜的力学性能随封闭率的升高而升高。
英文摘要:
      The blocked solvent-free polyurethane is mainly composed of hydrogenated phenylmethane diisocyanate (H12MDI) and polyester diol 2000, using methyl ethyl ketone oxime (MEKO) and caprolactam as blocking agents and dibutyltin dilaurate (DBTD) as catalyst. The blocked Solvent – free Polyurethane(SFPU) film was prepared by a prepolymer blocking method. The deblocking temperature and thermal properties of the blocked SFPU membrane were investigated by TGA and DSC. The effects of different sealers, leveling agents, catalyst dosage, oven temperature and blocking ratio on the deblocking temperature of the blocked SFPU, the curing conditions of the blocked SFPU and the film forming properties were investigated. The results showed that the deblocking temperature of the blocked SFPU with MEKO as a blocking agent was 143 ° C and the deblocking temperature of the blocked SFPU with caprolactam as a blocking agent was 163 ° C by differential scanning calorimetry (DSC).TGA analysis showed that at the same deblocking temperature, the blocking speed of the blocked SFPU with MEKO as the blocking agent was significantly higher than that of the blocked SFPU with caprolactam as the blocking agent. Under suitable curing conditions(The oven temperature is 140 ° C, the leveling agent mass fraction is 5%, and the catalyst mass fraction is 5‰. ), the blocked SFPU can be cured into a film, and the lower the blocking ratio of the blocked SFPU, the higher the curing temperature, the shorter the initial film forming time and the complete curing time of the blocked SFPU. From the five percentage closure gradients of 75%, 80%, 85%, 90%, 95%and100%, the mechanical properties of the membrane increased with the increase of the blocking ratio.
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