问题 问答题 简答题

粉料和粒料如何制造?一般分为几个步骤?

答案

参考答案:

粉料和粒料的配制一般分为四步:①原料的准备,包括原料的预处理、称量及输送。

②初混合,是在聚合物熔点以下的温度和较为缓和的剪切应力下进行的一种简单混合。混合时的加料次序:树脂、增塑剂、由稳定剂、润滑剂、染料等调制的混合物和其它固态填料等。③初混物的塑炼,塑炼的目的是为了改变物料的性状,使物料在剪切力的作用下热熔、剪切混合达到适当的柔软度和可塑性,使各组分的分散更趋均匀,同时还依赖于这种条件来驱逐其中的挥发物及弥补树脂合成中带来缺陷(驱赶残余单体、催化剂残余体等),使有利于输送和成型等。④塑炼物的粉碎和粒化,粉碎和粒化都是使固体物料在尺寸上得到减小;所不同的只是前者所成的颗粒大小不等,而后者比较整齐且具有固定形状。

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A Love Note To My Mom
When I was a little girl, I would often follow you as you modeled (做模特) for fashion magazine. It was years later that I finally understood what role modeling   in your life. I know little that you were     every penny you earned to go to       school.
I cannot thank you enough for  you told me one autumn afternoon when I was nine. After finishing my homework, I wandered into the dining room where you were buried   piles of law books. I was     .Why were you doing what I do—memorizing textbooks and studying for    ? When you said you were in law school, I was more puzzled. I didn’t know Moms     be lawyers too. You smiled and said,“In life, you can do anything you want to do.”
Though I was young, your words kept     in my ears. I watched as you faced the     of completing your studies, starting companies with Dad, while still being a     and a Mom of five kids. I was tired just watching you     . With your wise words in my      mind, I suddenly felt free to dream. My whole world    . I set out to live my life filled with     , seeing endless possibilities for personal achievements.
Your words became my motto. I     found myself in the position of being either the first (woman doctor in Maryland Rotary)       one of the few women (top medical reporters) in my field. I gained strength every time I said , “Yes, I’ll try that.”
Encouraged by your     , I have forged ahead (毅然前行) with my life’s journey, less afraid to make mistakes, and      meeting each challenge. You did it, and now I’m     it. Sorry, got to run. So much to do, so many dreams to live.
小题1:
A.foundB.playedC.keptD.provided
小题2:
A.savingB.makingC.givingD.receiving
小题3:
A.businessB.fashionC.lawD.medical
小题4:
A.whatB.thatC.whichD.where
小题5:
A.atB.toC.uponD.under
小题6:
A.pleasedB.worriedC.puzzledD.disappointed
小题7:
A.roleB.testsC.positionsD.shows
小题8:
A.mustB.ought toC.needD.could
小题9:
A.ringingB.floatingC.fallingD.beating
小题10:
A.choicesB.chancesC.challengesD.changes
小题11:
A.professorB.doctorC.reporterD.model
小题12:
A.in dangerB.in actionC.in troubleD.in charge
小题13:
A.weakB.powerfulC.youthfulD.empty
小题14:
A.came backB.closed downC.went byD.opend up
小题15:
A.hopeB.hardshipC.regretD.sadness
小题16:
A.oftenB.rarelyC.hardlyD.nearly
小题17:
A.and B.butC.orD.for
小题18:
A.understandingB.wordsC.praiseD.introduction
小题19:
A.secretlyB.curiouslyC.carelesslyD.confidently
小题20:
A.doingB.consideringC.correctingD.reading