有机硅改性热固性酚醛树脂的合成及应用研究OA

In this paper,3-isocyanatopropyl triethoxysilane(KH-907)was employed as a modifier,while phenol and formaldehyde served as monomer raw materials.The intermediate of N-(3-triethoxysilylpropyl)phenyl carbamate was synthesized by controlling the conditions of the addition reaction.Subsequently,this intermediate re-acted with formaldehyde under the catalysis of an alkaline catalyst,successfully synthesizing the organosilicon-mod-ified phenolic resin liquid(IPTES-PF).The chemical structure and curing behavior of the modified phenol-formal-dehyde(PF)were investigated via fourier transform infrared spectroscopy(FTIR)and differential scanning calo-rimetry(DSC).The effects of the addition amount of organosilicon and the material ratio on the mechanical proper-ties and thermal stability of the modified PF were studied through mechanical property tests and thermogravimetric(TG)analysis.The results indicated that the introduction of KH-907 enhanced the heat resistance of PF.Moreo-ver,as the content of the modifier KH-907 and the molar ratio of formaldehyde increased,the mechanical proper-ties of the organosilicon-modified PF initially rose and then declined.When the content of KH-907 was 15％and the molar ratio of phenol to formaldehyde was 1:1.8,the mechanical properties of the organosilicon-modified PF resin liquid were optimal,with a tensile shear strength of 7.06 MPa and a peel strength of 328 N/5 cm.The impact strength of the silicone modified PF composite and the grinding ratio of the consolidated abrasive tool reach the maxi-mum when the content of KH-907 is 15％,which are 2.87 kJ/m2 and 20.913,respectively.