酚醛改性环氧粉末涂料，由于两种树脂的共聚交联反应，增加了体系的交联密度、提高了涂膜耐介质渗透能力，尤其耐酸性和耐水性及耐有机溶剂等性能提高，弥补了环氧树脂这方面的不足。添加稀土酚醛改性环氧粉末涂料后，使涂料力学性能比只用酚醛改性明显提高，极大改善了酚醛的脆性，同时耐沸水性和吸水率，以及耐有机溶剂性也有了进一步改善，涂膜耐介质渗透能力及粉末涂料贮存稳定性能大大提高。据专家介绍，由于稀土元素一般易失去3个电子，呈正三价、反应活性极高，是参加反应的高活性剂，也是自身催化剂；而与树脂反应后所得化合物键能极强，因此树脂的耐热、耐磨、耐腐蚀等性能得到提高。北京化工大学材料科学与工程学院，最近在耐腐蚀环氧粉末涂料改性研究中，用氯化稀土来改性酚醛树脂，利用稀土改性酚醛树脂力学性能好的优点，来弥补酚醛树脂的不足。
关于稀土酚醛树脂制备方法，据专家介绍，取一定量酚醛树脂加入5％氯化稀土，倒人500mL三口瓶中，加热升温并开始搅拌10～15min，升温至80～85℃保温反应10～15min，然后将反应液加热至沸腾，在沸腾状态下回流反应3～4h，继续加热并真空脱水，观察体系温度上升速度，温度达到140℃～160℃时根据性能需要即可出料。氯化稀土改性后的酚醛树脂GPC和IR测试表明，改性酚醛树脂红外光谱图中与酚羟基有关的3个特征峰3318cm-1、1362cm-1和1233cm-1，其振动强度比未改性时均减弱，说明稀土元素与酚醛树脂发生反应，生成键合牢固的键。未改性酚醛树脂的峰位分子质量Mp为488，改性后，酚醛树脂的峰位分子质量Mp增大到605，高分子质量级分峰的Mn自683增大到709，这是由于稀土元素与酚醛树脂分子产生共聚反应，导致数均分子质量Mn整体增大。IR和GPc谱图都证明了氯化稀土粒子，与酚醛书寸月旨分子链形成化学键，稀土改性酚醛为化学改性。添加稀土后涂层力学性能比只用酚醛改性明显提高，而涂层吸水率和耐沸水性能更进一步提高，也说明稀土改性后粉末涂料性能有了明显改善。
酚醛改性后体系耐酸能力大大提高，同时耐有机溶剂性能也有明显改善，而添加稀土酚醛改性后效果更加明显。专家还介绍了稀土酚醛改性环氧粉末涂料的贮存稳定性。双氰胺固化粉末涂料贮存稳定性一般，引入固化促进剂2-甲基咪唑后，由于促进剂极强的活性，使得体系稳定性更差，一般保存不到一周就有结块现象，并且涂料反应活性下降。一般情况下大都选择对促进剂，进行丙烯酸脂改性的办法来提高其适用期，而该研究则使用稀土酚醛改性办法，这是因为稀土反应后生成化合物非常稳定，而且已知其是PVC等目前最理想的稳定剂，改性后粉末涂料稳定性大大增加。采用具体方法是将粉末涂料样品密封，室温下保存6个月，取出后与新制样品进行对比，涂料贮存前后外观无明显变化再时进行DSC测试。由实验图表可以看出，除了913CM-1处环氧键特征峰相比未贮存时有所下降外，其余如3429cm-1羟基峰，2206.9cm-1、2162.2cm-1处双氰胺特征峰等活性基团都没有太大变化，说明其有大量未反应。而对贮存6个月后粉末涂料进行固化反应，发现其仍具有可操作性，固化性能没有明显影响。
The following has evaluated to null or missing:
==> langConfig [in template "public_include/wap/module/version_1/language.html" at line 49, column 14]
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Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
- Failed at: #if langConfig.status?string = "false" [in template "public_include/wap/module/version_1/language.html" at line 49, column 9]
- Reached through: #include "/public_include/wap/module/... [in template "tpl/2018/03/17/2613443926933696//wap/com_5.html" at line 5, column 1]
- Reached through: #include "com_5.html" [in template "tpl/2018/03/17/2613443926933696//wap/displaynews.html" at line 69, column 6]
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Java stack trace (for programmers):
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freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:80)
at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:43)
at freemarker.core.NonHashException.<init>(NonHashException.java:49)
at freemarker.core.Dot._eval(Dot.java:48)
at freemarker.core.Expression.eval(Expression.java:81)
at freemarker.core.BuiltInsForMultipleTypes$stringBI._eval(BuiltInsForMultipleTypes.java:692)
at freemarker.core.Expression.eval(Expression.java:81)
at freemarker.core.EvalUtil.compare(EvalUtil.java:111)
at freemarker.core.ComparisonExpression.evalToBoolean(ComparisonExpression.java:62)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:327)
at freemarker.core.Environment.visit(Environment.java:333)
at freemarker.core.Environment.include(Environment.java:2509)
at freemarker.core.Include.accept(Include.java:171)
at freemarker.core.Environment.visit(Environment.java:327)
at freemarker.core.Environment.visit(Environment.java:333)
at freemarker.core.Environment.include(Environment.java:2509)
at freemarker.core.Include.accept(Include.java:171)
at freemarker.core.Environment.visit(Environment.java:327)
at freemarker.core.Environment.visit(Environment.java:333)
at freemarker.core.Environment.process(Environment.java:306)
at freemarker.ext.servlet.FreemarkerServlet.processEnvironment(FreemarkerServlet.java:946)
at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:910)
at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:769)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at com.kenfor.iyong.web.util.filter.NotAllowedToTunFilesFilter.doFilter(NotAllowedToTunFilesFilter.java:154)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at com.kenfor.iyong.web.util.filter.InvalidXSSFilter.doFilter(InvalidXSSFilter.java:40)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve.invoke(RedisSessionHandlerValve.java:26)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:873)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)