| 酸-碱-酸-碱工艺合成脲醛树脂 |
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| 引用本文： | 官仕龙,饶历,郭廷斌,匡启荣.酸-碱-酸-碱工艺合成脲醛树脂[J].化学与粘合,2010,32(3):77-79. |
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| 作者姓名： | 官仕龙 饶历 郭廷斌 匡启荣 |
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| 作者单位： | 武汉工程大学绿色化工过程省部共建教育部重点实验室,湖北省新型反应器与绿色化学工艺重点实验室,湖北武汉430073 |
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| 摘 要： | 以酸-碱-酸-碱工艺合成一种聚乙烯醇(PVA)、三聚氰胺改性脲醛树脂,研究了原料配比、pH值、反应时间等对产品性能的影响。结果发现,当n甲醛:n尿素=1.6:1,聚乙烯醇加入量为甲醛和尿素总质量的1%,三聚氰胺加入量为甲醛和尿素总质量的3%,酸性条件下pH=5.5,碱性条件pH=8.5～9.0,反应温度为80℃左右时,合成的脲醛树脂的机械强度较好,游离甲醛的含量较低。
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| 关 键 词： | 脲醛树脂 木用胶黏剂 游离甲醛 环保 三聚氰胺 |
Synthesis of Urea-formaldehyde Resin by Acid-Base-Acid-Base Technique |
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| GUAN Shi-long,RAO Li,GUO Ting-bin,KUANG Qi-rong.Synthesis of Urea-formaldehyde Resin by Acid-Base-Acid-Base Technique[J].Chemistry and Adhesion,2010,32(3):77-79. |
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| Authors: | GUAN Shi-long RAO Li GUO Ting-bin KUANG Qi-rong |
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| Affiliation: | (Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Chemical Reactor and Green Chenlical Technology, Wuhan Institute of Technology, Wuhan 430074, China) |
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| Abstract: | A PVA/melamine modified urea-formaldehyde resin was prepared by ＂acid-base-acid-base＂ technique. The influences of the molar ratio of formaldehyde/urea, pH value, reaction temperature and reaction time on the properties of the product were investigated. The result showed that when n （formaldehyde）： n （urea） = 1.6：1, m （PVA）/m （urea ＋formaldehyde） = 1% m （Melamine）/m （urea ＋formaldehyde） =3%, pH value was 5.5 （under acid condition） and 8.5-9.0 （under base condition）, and reacted at 80℃, the synthesized product had the characteristics of excellent mechanical strength with low free formaldehyde content. |
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| Keywords: | Urea-formaldehyde resin wood adhesive free formaldehyde content environmental protection melamine |
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