本文選題：擠出滾壓 + 聚合物　； 參考：《北京化工大學(xué)》2011年碩士論文

【摘要】：本論文致力于結(jié)合單螺桿精密擠出成型和滾輪微壓印成型來制作聚合物微結(jié)構(gòu)新技術(shù)的研究與開發(fā)。利用單螺桿擠出成型制造所需的光學(xué)聚合物薄板,當(dāng)聚合物薄板還在高溫時(shí),讓其直接進(jìn)入滾輪微壓印設(shè)備,把滾輪上的微結(jié)構(gòu)轉(zhuǎn)印至聚合物薄板表面上。本研究自行開發(fā)組立出一套新型的擠出滾輪微壓印系統(tǒng),通過設(shè)計(jì)并開發(fā)擠出模具與滾輪微壓印設(shè)備,最終證實(shí)本系統(tǒng)可用于微結(jié)構(gòu)大量連續(xù)地轉(zhuǎn)印。此技術(shù)可以達(dá)到roll-to-roll快速大量連續(xù)地進(jìn)行聚合物微結(jié)構(gòu)制品的復(fù)制生產(chǎn),具有工藝過程簡易、高效率及大面積復(fù)制等優(yōu)勢,是一種極具潛力的微結(jié)構(gòu)成型技術(shù)。 本研究所開發(fā)的滾輪微壓印設(shè)備,其滾輪直徑為Φ64 mm,長度為125mm,驅(qū)動滾輪轉(zhuǎn)速范圍為0～30 rpm。金屬微結(jié)構(gòu)滾輪模具采用平板包覆法制作,微結(jié)構(gòu)為周期性分布的微孔結(jié)構(gòu)。擠出機(jī)機(jī)頭采用衣架型機(jī)頭,擠出口膜寬度為200 mm,厚度為1 mm。 采用自行組建的擠出滾壓系統(tǒng)進(jìn)行試驗(yàn),從機(jī)頭擠出來的聚合物薄板直接進(jìn)入到滾輪組中,研究發(fā)現(xiàn)當(dāng)聚丙烯(PP)薄板進(jìn)入滾輪組時(shí)其表面溫度仍處于材料的熔點(diǎn)(Tm)附近。在適當(dāng)?shù)毓に嚄l件下,微結(jié)構(gòu)經(jīng)光學(xué)顯微鏡與3D影像測量儀觀測證實(shí)可成功轉(zhuǎn)印至聚合物薄板表面上。 本研究還探討了機(jī)頭溫度、驅(qū)動滾輪轉(zhuǎn)速、壓力等工藝參數(shù)對微結(jié)構(gòu)成型性的影響。研究結(jié)果表明,驅(qū)動滾輪轉(zhuǎn)速越快,聚合物薄板表面微結(jié)構(gòu)的成型性會變差；然而當(dāng)滾輪壓力越大、機(jī)頭溫度越高時(shí),微結(jié)構(gòu)的成型性會變好。擠出滾壓目前得到的最佳的成型工藝參數(shù)為機(jī)頭溫度210℃、驅(qū)動滾輪轉(zhuǎn)速1.5rpm、壓力8200 N。這時(shí)所制備出的聚合物微透鏡陣列直徑均勻性與高度轉(zhuǎn)寫率都極佳。 使用聚碳酸酯(PC)和聚丙烯(PP)兩種聚合物來探討材料及微結(jié)構(gòu)對聚合物薄板光學(xué)性質(zhì)的影響。研究結(jié)果表明,聚碳酸脂(PC)和聚丙烯(PP)所制作的擴(kuò)散板都可對光線產(chǎn)生擴(kuò)散作用,但聚碳酸酯(PC)的擴(kuò)散作用明顯好于聚丙烯(PP)；當(dāng)擴(kuò)散板表面帶有微結(jié)構(gòu)時(shí),其對光束的擴(kuò)散作用則會顯著提高,但擴(kuò)散板的霧度會增加,透光率則會下降；微結(jié)構(gòu)對擴(kuò)散板光學(xué)性能的影響不僅與其尺寸大小有關(guān),而且與微結(jié)構(gòu)的分布也有著很大的關(guān)系。
[Abstract]:This thesis is devoted to the research and development of new polymer microstructures technology combined with single screw precision extrusion and roller micro-imprint. When the polymer sheet is still in high temperature, the optical polymer sheet can be directly entered into the roller micro-embossing equipment, and the microstructure of the roller can be transferred to the surface of the polymer sheet. A new type of extrusion wheel micro-imprint system was developed by the research team. By designing and developing the extrusion die and roller micro-imprint equipment, it was proved that the system could be used to transfer the microstructure continuously. This technology can be used for rapid and continuous production of polymer microstructural products by roll-to-roll, which has the advantages of simple process, high efficiency and large area replication. It is a potential microstructural molding technology. The rolling wheel microimprint equipment developed in this paper has a diameter of 桅 64 mm, a length of 125 mm and a speed range of 0 ~ 30 rpm. The metal microstructural roller die is made by plate cladding method. The microstructure is a microporous structure with periodic distribution. Extruder head adopts hanger head, extrusion exit film width is 200 mm, thickness is 1 mm. The experiment was carried out by using the self-made extrusion rolling system. The polymer sheet extruded from the die head directly entered the rolling wheel group. It was found that the surface temperature of polypropylene (PP) sheet was still near the melting point (TM) of the material when it entered the rolling wheel group. Under proper technological conditions, the microstructure can be successfully transferred to the surface of the polymer sheet by optical microscope and 3D image measuring instrument. The influence of the process parameters, such as the temperature of the die, the rotational speed of the driving roller and the pressure, on the molding property of the microstructures is also discussed. The results show that the faster the rotating speed of the driving wheel, the worse the molding property of the microstructure on the surface of the polymer sheet, but the better the molding property of the microstructure will be when the pressure of the roller is higher and the temperature of the die head is higher. The optimum process parameters obtained at present are head temperature 210 鈩，

本文編號：2065849