神马品牌网罗阻和糖心合照:求英语高手帮忙翻译，化工方面材料
来源：百度文库 编辑：神马品牌网 时间：2024/04/27 22:41:50
Synthesis of DOPO Epoxy Resin
Into a 1-L reaction vessel equipped with temperature and pressure controls and indicators, means for the continuous or intermittent addition of aqueous sodium hydroxide, means for condensing and separating water from a codistillate mixture of water, solvent, and epichlorohydrin, and means for returning the solvent and epichlorohydrin to the reaction vessel was added 64.8 g (1 equivalent) of ODOPB, 185 g (5 equivalents) of epichlorohydrin, and 54 g of the methylether of propylene glycol (1-methoxy-2-hydroxypropane) as a solvent. After stirring at room temperature and atmospheric pressure to thoroughly mix the contents, the temperature was raised to 65°C and the pressure was reduced to 160 mm Hg absolute. To the resultant solution was continuously added 8 g, 2 equivalents of a 50% aqueous sodium hydroxide solution at a constant rate over a period of 1 h. During the addition of the sodium hydroxide, the water was removed by codistilling with epichlorohydrin and solvent. The distillate was condensed, thereby forming two distinct phases, an aqueous phase (top) and an organic epichlorohydrin– solvent phase (bottom). The organic phase was continuously returned to the reactor. After completion of the sodium hydroxide addition, the reaction mixture was maintained at a temperature of 65°C and a pressure of about 160 mm Hg absolute for an additional 30 min. A sample of the reaction mixture was washed to remove salt and subsequently distilled resulting in an epoxidized ODOPB resin (DOPO epoxy resin) having a hydrolysable chloride content of 0.02% and an epoxide content of ; 23.5%, which corresponds to an epoxide equivalent weight of about 223 ; 228.
Curing Procedure of Epoxy Resins
The thermal and fire retardant properties of the phosphorus- and nonphosphorus-containing epoxy resin were evaluated by preparing six cured epoxy resins, i.e., DOPO epoxy resin cured with Bis-A/Ph Nov, DOPO/Ph Nov; Bis-A/DDS, DOPO/DDS, Bis-A/DICY, DOPO/DICY. To obtain a highly crosslinked polymer with good thermal stability, one epoxy equivalent weight of the epoxy resins was cured with one functional equivalent weight of the curing agents. Curing steps were predetermined by DSC thermograms of respective epoxy/ curing agent compositions (Table I).
Into a 1-L reaction vessel equipped with temperature and pressure controls and indicators, means for the continuous or intermittent addition of aqueous sodium hydroxide, means for condensing and separating water from a codistillate mixture of water, solvent, and epichlorohydrin, and means for returning the solvent and epichlorohydrin to the reaction vessel was added 64.8 g (1 equivalent) of ODOPB, 185 g (5 equivalents) of epichlorohydrin, and 54 g of the methylether of propylene glycol (1-methoxy-2-hydroxypropane) as a solvent. After stirring at room temperature and atmospheric pressure to thoroughly mix the contents, the temperature was raised to 65°C and the pressure was reduced to 160 mm Hg absolute. To the resultant solution was continuously added 8 g, 2 equivalents of a 50% aqueous sodium hydroxide solution at a constant rate over a period of 1 h. During the addition of the sodium hydroxide, the water was removed by codistilling with epichlorohydrin and solvent. The distillate was condensed, thereby forming two distinct phases, an aqueous phase (top) and an organic epichlorohydrin– solvent phase (bottom). The organic phase was continuously returned to the reactor. After completion of the sodium hydroxide addition, the reaction mixture was maintained at a temperature of 65°C and a pressure of about 160 mm Hg absolute for an additional 30 min. A sample of the reaction mixture was washed to remove salt and subsequently distilled resulting in an epoxidized ODOPB resin (DOPO epoxy resin) having a hydrolysable chloride content of 0.02% and an epoxide content of ; 23.5%, which corresponds to an epoxide equivalent weight of about 223 ; 228.
Curing Procedure of Epoxy Resins
The thermal and fire retardant properties of the phosphorus- and nonphosphorus-containing epoxy resin were evaluated by preparing six cured epoxy resins, i.e., DOPO epoxy resin cured with Bis-A/Ph Nov, DOPO/Ph Nov; Bis-A/DDS, DOPO/DDS, Bis-A/DICY, DOPO/DICY. To obtain a highly crosslinked polymer with good thermal stability, one epoxy equivalent weight of the epoxy resins was cured with one functional equivalent weight of the curing agents. Curing steps were predetermined by DSC thermograms of respective epoxy/ curing agent compositions (Table I).
too long to interest