本文關(guān)鍵詞：內(nèi)添加型PET多層共擠光擴(kuò)散膜的制備與性能研究　出處：《西南科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： PET光擴(kuò)散膜 多層共擠 熱拉伸 透光率 霧度

【摘要】：光擴(kuò)散膜是LCD液晶顯示器背光源模組中重要的光學(xué)薄膜,它常被應(yīng)用到燈飾廣告牌、戶外顯示屏、液晶顯示器中起霧化光源的作用。當(dāng)前,制備光擴(kuò)散膜的方法主要有涂布法和共混法,而采用多層共擠方式制備光擴(kuò)散膜的研究鮮有報道。由于多層共擠光擴(kuò)散膜具有能解決因涂布不均導(dǎo)致的掉粉、掉渣情況,同時相對于單層光擴(kuò)散膜,又有減少光擴(kuò)散劑的使用量,節(jié)約生產(chǎn)成本等優(yōu)勢,因此本文對內(nèi)添加型PET多層共擠光擴(kuò)散膜進(jìn)行了相關(guān)研究。本文首先制備了LLDPE/PET多層共擠光擴(kuò)散膜,研究了光擴(kuò)散劑含量、熱拉伸方式、拉伸倍數(shù)等對光擴(kuò)散膜的透光率和霧度的影響,同時采用掃描電子顯微鏡對PET薄膜脆斷面進(jìn)行了形態(tài)研究。結(jié)果表明:隨著LLDPE含量的增加,分散相平均粒徑增大,未拉伸薄膜的透光率降低,霧度升高。經(jīng)過雙軸拉伸后,分散相形態(tài)逐漸偏離球形,多層光擴(kuò)散膜的透光率增加,霧度逐漸降低,但霧度降低趨勢小于單層光擴(kuò)散膜。LLDPE含量占光擴(kuò)散層8wt%時,制備的多層光擴(kuò)散膜(177μm)的透光率為87.4%,霧度為84.42%。采用多層共擠制備的LLDPE/PET光擴(kuò)散膜,在透光率提高的同時,霧度依然保持在較高值,且光擴(kuò)散劑的用量比單層光擴(kuò)散薄膜要少50%。其次,制備了有機硅/PET多層共擠光擴(kuò)散膜,研究了光擴(kuò)散劑含量、拉伸倍數(shù)、螺桿轉(zhuǎn)速比、擠出溫度、冷卻輥轉(zhuǎn)速和溫度、增粘PET等對光擴(kuò)散膜的透光率和霧度的影響。結(jié)果表明:隨著雙軸拉伸倍數(shù)的增加,多層光擴(kuò)散膜的透光率先增加后減小,霧度先減小后增加。當(dāng)拉伸倍數(shù)過大時,薄膜表面將形成球冠型微結(jié)構(gòu),引起透光率降低,霧度升高。同時,提高中間層擠出溫度、降低光擴(kuò)散層與中間層厚度比例、提高冷卻輥轉(zhuǎn)速和降低冷卻輥溫度均會使透光率增加,霧度降低。當(dāng)有機硅含量占光擴(kuò)散層10wt%,螺桿轉(zhuǎn)速比為110:80,冷輥溫度為25℃,冷輥轉(zhuǎn)速為1.4m/min時,經(jīng)雙軸拉伸2.5倍的有機硅/PET多層光擴(kuò)散膜(160μm)的透光率為81.2%,霧度為93.24%。光擴(kuò)散層中的PET經(jīng)1wt%擴(kuò)鏈劑增粘后,主擠出機的螺桿轉(zhuǎn)速可調(diào)節(jié)范圍更寬廣,更有利于多層共擠光擴(kuò)散膜的制備成型。再次,制備了PP/PET多層共擠光擴(kuò)散膜,研究了光擴(kuò)散劑含量和粒徑、相容劑含量、拉伸倍數(shù)等對光擴(kuò)散膜的透光率和霧度的影響。結(jié)果表明:通過添加2.5wt%PP-g-MAH,能夠有效的改善PET樹脂與分散相的相容性,細(xì)化分散相顆粒尺寸。隨著雙軸拉伸倍數(shù)的增加,光擴(kuò)散膜的透光率先升高后趨于不變,霧度逐漸降低。當(dāng)雙軸拉伸倍數(shù)大于3倍后,分散相顆粒形貌逐漸偏離球形,且其球形度的改變是引起透光率和霧度變化的一大原因。當(dāng)螺桿轉(zhuǎn)速比為110:80,PP-g-MAH和PP含量占光擴(kuò)散層12wt%時,經(jīng)雙軸拉伸2倍的PP/PET多層共擠光擴(kuò)散膜(210μm)的透光率為78.2%,霧度為93.33%。最后,為了將多層共擠光擴(kuò)散膜與涂布型光擴(kuò)散膜進(jìn)行對比,制備了PMMA/PET涂布型光擴(kuò)散膜。結(jié)果表明:隨著PMMA含量的增加,透光率減小,霧度增大,當(dāng)PMMA含量占涂布層23wt%時,薄膜的透光率為90.1%,霧度為87.03%。與采用涂布方式制備的PMMA/PET光擴(kuò)散膜相比,采用多層共擠方式制備的PP/PET光擴(kuò)散膜和有機硅/PET光擴(kuò)散膜的霧度均較高,透光率則略低。
[Abstract]:Light diffusion film optical thin film is an important LCD LCD backlight module, it is often applied to lighting billboards, outdoor displays, play a role in liquid crystal display light source atomization. At present, preparation method of light diffusing film main coating method and blending method, and the way of research is rarely reported in coextrusion layer system preparation of light diffusion film. The multilayer coextrusion light diffusion film can solve due to uneven application of lead powder, dregs, and compared with single-layer light diffusing film, and reduce the use amount of light diffusing agent, saves the production cost and other advantages, so this type of addition of PET multilayer films were light diffusion related research. First LLDPE/PET multilayer light diffusion film prepared in this study, the light diffusing agent content, hot stretching, stretching ratio on the influence of light diffusion film transmittance and haze, while using scanning electron. Micro mirror the morphological study of PET thin film brittle fracture surface. The results showed that with the increase of LLDPE content, the average particle size of dispersed phase increased, transparent unstretched films decreased haze increased. After biaxial tension, the morphology of dispersed phase gradually deviate from spherical, transparent multilayer light diffusing film haze rate increased gradually reduced, but the fog degree decreased less than single light diffusion film.LLDPE content accounted for the light diffusion layer 8wt%, multilayer prepared light diffusing film (177 m) of the 87.4% light transmittance, haze is 84.42%. prepared by multi-layer coextrusion LLDPE/PET light diffusion film, while improving the light transmittance, haze still keep in high value, and the light diffusing agent is less than 50%. the second monolayer film diffusion light, preparation of silicone /PET multilayer light diffusing film of light diffusing agent content, stretching ratio, screw speed, extrusion temperature, cooling roller speed and temperature, viscosity Effect of PET on the light diffusing film transmittance and haze. The results showed that with the increase of biaxial tensile ratio, multilayer transparent light diffusing film first increased and then decreased, haze decreased and then increased. When the stretching ratio is too large, the film surface will form the spherical micro structure caused by transmittance decrease, haze increased. At the same time, improve the middle layer extrusion temperature, reduce the light diffusion layer and the middle layer thickness ratio, improve the cooling roll speed and reduce the cooling roll temperature will cause higher transmittance, haze reduced. When the light diffusion layer of silicone content accounted for 10wt%, the screw speed is 110:80, cold roll temperature is 25. Cold roller speed of 1.4m/min, silicone /PET multilayer biaxial stretching 2.5 times the light diffusion film (160 m) of the 81.2% light transmittance, haze is 93.24%. light diffusion layer in PET by 1wt% chain extender viscosify, main extruder screw speed adjustable range is wider, more A multilayer coextrusion molding preparation for light diffusing film. Thirdly, the preparation of PP/PET multilayer coextrusion light diffusing film on the light diffusion agent content and particle size, the content of compatibilizer, influence of stretching ratio on the light diffusing film transmittance and haze. The results showed that by adding 2.5wt% PP-g-MAH compatible effective improvement of PET resin and dispersed phase, fine particle size of disperse phase. With the increase of biaxial tensile ratio, light diffusion film first increased and then remained unchanged, the haze gradually decreased. When the biaxial tension is greater than a multiple of 3 times, the morphology of dispersed phase particles gradually deviate from spherical, and the spherical degree of change a major cause of transmittance and haze change. When the screw speed ratio of 110:80, PP-g-MAH and PP content of the light diffusion layer 12wt%, the PP/PET multilayer biaxially stretched to 2 times the light diffusion film (210 m) of the 78.2% light transmittance, haze is 93.33 In order to%. Finally, the light diffusion film and multilayer coextrusion coating type light diffusion film were compared, PMMA/PET coated optical diffusion membrane was prepared. The results showed that with the increase of PMMA content, the transmittance decreases, the fog degree increases, when the content of PMMA for coating layer 23wt%, the transmittance of the films was 90.1%, compared to the fog the degree of 87.03%. and PMMA/PET were prepared by coating the light diffusion film prepared by multi-layer coextrusion PP/PET light diffusion film and silicon /PET light diffusing film haze were higher, the transmittance is slightly lower.

【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TB383.2

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