TW201501826A - Method for recycling of polarizers - Google Patents

Abstract

A method for recycling of polarizers is disclosed herein to comprise the steps of: crushing polarizers and dipping it into basic solvent to dissolve the Iodine of the inner and outer support membrane then washing and dehydrating thereof. The heat generated by a force of friction during the dehydration will dissolve the inner and outer support membrane and the adhesive layer, which make the inner and outer support membrane, the adhesive layer and polarizers separate from each other. Lastly, remove the accumulations of a blob of polarizers and the adhesive layer that dissolved in water to obtain the rest of inner and outer support membrane. In such a case, this method for recycling of polarizers not only can achieve the purpose of environmental protection but also can prevent the wastes of resources due to different types of materials of the polarizers can be collected and recycled respectively.

Description

偏光板回收方法(一)Polarizer recovery method (1)

     本發明係有關於一種偏光板回收方法，尤其是指一種能使構成偏光板的不同材質部分均能被分開收集再利用，而確實達到環保與避免資源浪費之效果的偏光板回收方法。The invention relates to a method for recovering a polarizing plate, in particular to a method for recovering a polarizing plate which can separately collect and reuse different material parts constituting the polarizing plate, and achieve the effects of environmental protection and avoiding waste of resources.

     偏光板是液晶顯示器不可或缺的關鍵零組件，主要係控制特定光波的偏振方向，使光通過或遮蔽，達到只允許某方向的光線才能通過的效果，而藉此將背光模組發出的不具偏極性的光源產生偏極化，使之轉變為偏極光，偏極光再透過液晶分子的扭轉，如此一來便能控制光線通過量的多寡，進而調控LCD畫面的明暗。The polarizing plate is an indispensable key component of the liquid crystal display, and mainly controls the polarization direction of a specific light wave, so that the light passes or is shielded to achieve the effect that only a certain direction of light can pass, and thus the backlight module is not provided. The polarized light source is polarized to convert it into polarized light, and the polarized light is transmitted through the twist of the liquid crystal molecules, so that the amount of light passing through can be controlled, thereby controlling the brightness of the LCD picture.

     請參看第一圖，為現有的偏光板（１）結構，該偏光板（１）具有一透光性良好且能產生偏光機制之偏光本體層（１１）（PVA,聚乙烯醇）、分別結合在該偏光本體層（１１）上、下表面之外支撐膜層（１２）（TAC,三醋酸纖維素）與內支撐膜層（１３）（TAC,三醋酸纖維素）、一結合在該外支撐膜層（１２）上表面的表面保護膜層（１４）（PET,聚對苯二甲酸乙二酯）、一結合在該內支撐膜層（１３）下表面的膠層（１５）（PMMA,聚甲基丙烯酸甲酯），及一可撕除地結合在該膠層（１５）下表面的離型膜層（１６）（PET, 聚對苯二甲酸乙二酯）。其中：Please refer to the first figure, which is a structure of the existing polarizing plate (1). The polarizing plate (1) has a polarizing body layer (11) (PVA, polyvinyl alcohol) which has good light transmittance and can generate a polarizing mechanism, and is respectively combined. The film layer (12) (TAC, cellulose triacetate) and the inner support film layer (13) (TAC, cellulose triacetate) are combined on the upper and lower surfaces of the polarizing body layer (11). a surface protective film layer (14) (PET, polyethylene terephthalate) supporting the upper surface of the film layer (12), a glue layer (15) bonded to the lower surface of the inner support film layer (13) (PMMA , polymethyl methacrylate), and a release film layer (16) (PET, polyethylene terephthalate) which is releasably bonded to the lower surface of the adhesive layer (15). among them:

     該偏光本體層（１１）是由透光性良好的聚乙烯醇（PVA）薄膜吸附碘素錯體或含雙色性染料，使碘離子或染料擴散進入聚乙烯醇（PVA）薄膜中，微熱後拉伸聚乙烯醇（PVA）薄膜而製成，由於其在受應力延伸後其分子排列呈一定之方向，且利用碘素錯體及雙色性染料對特定波向光之吸收，便能達到偏光效果。The polarizing body layer (11) adsorbs an iodine dislocation or a dichroic dye by a polyvinyl alcohol (PVA) film having good light transmittance, and diffuses iodide ions or dye into a polyvinyl alcohol (PVA) film. Stretching a polyvinyl alcohol (PVA) film, because its molecular orientation is in a certain direction after stress extension, and the absorption of specific wave light by iodine complex and dichroic dye can achieve polarized light. effect.

     該外支撐膜層（１２）與該內支撐膜層（１３）係採三醋酸纖維素（TAC）製成，該三醋酸纖維素（TAC）是由天然纖維素與醋酸酐反應製得的高分子，具有高透明性、低光學異向性、良好的耐溶劑性及耐熱性。The outer support film layer (12) and the inner support film layer (13) are made of cellulose triacetate (TAC), which is obtained by reacting natural cellulose with acetic anhydride. Molecules with high transparency, low optical susceptibility, good solvent resistance and heat resistance.

     由於液晶螢幕製造廠在生產偏光板的過程中，會產生大量的偏光板裁切廢料與具有瑕疵之偏光板，而這些廢料與瑕疵品目前大多以焚化或掩埋方式處理，惟焚化或掩埋處理的方式卻造成空氣與環境污染，加上三醋酸纖維素（TAC）之內、外支撐膜層（１３）、（１２）佔整個偏光板（１）材料成本至少50%，因此直接廢棄該些廢料與瑕疵品，將造成資源浪費。In the process of producing polarizing plates, liquid crystal screen manufacturers produce a large number of polarizing plate cutting wastes and polarizing plates with defects, and most of these wastes and products are currently incinerated or buried, but incinerated or buried. The method causes air and environmental pollution, and the inner and outer support film layers (13) and (12) of cellulose triacetate (TAC) account for at least 50% of the material cost of the entire polarizing plate (1), so the waste is directly discarded. With counterfeit products, it will cause waste of resources.

     是故，若能對廢棄的偏光板進行回收處理，不但能藉此回收部分材料增加廢棄偏光板的利用價值與避免資源浪費，還能避免廢棄偏光板所造成的環保問題。Therefore, if the discarded polarizing plate can be recycled, it can not only recover part of the material to increase the utilization value of the waste polarizing plate and avoid waste of resources, but also avoid environmental problems caused by the waste of the polarizing plate.

     基於此，本案發明人曾提出一種偏光板回收方法（第１０３１０２２３９號），其主要是利用生物鹼溶液將偏光板中所含的碘分離出來，再將偏光板所包含之各部分材料分類回收。今發明人再一本初衷，研發出另一種同樣能夠回收偏光板的方法。Based on this, the inventors of the present invention have proposed a method for recovering a polarizing plate (No. 103102239), which mainly uses an alkaloid solution to separate iodine contained in a polarizing plate, and then classifies and recovers various materials contained in the polarizing plate. Now the inventor has another original intention to develop another method that can also recover polarizing plates.

     本發明之主要目的，為提供一種能回收偏光板廢棄物以增加其再利用價值的偏光板回收方法。The main object of the present invention is to provide a method for recovering a polarizing plate capable of recovering polarized plate waste to increase its reuse value.

     上述本發明之主要目的，是由以下之具體技術手段所達成：The above main object of the present invention is achieved by the following specific technical means:

     一種偏光板回收方法，包含下列步驟：A method for recovering a polarizing plate, comprising the following steps:

     步驟一：將偏光板直接粉碎，以成多數個預定大小的母碎片；Step 1: directly pulverize the polarizing plate to form a plurality of female fragments of predetermined size;

     步驟二：將該等母碎片浸入於化學鹼性溶劑中一段預定時間，以溶解該偏光板中的膠層，同時將內、外支撐膜層中之碘溶出，及使偏光本體層、內、外支撐膜層相分離，以分別形成多數個偏光本體層碎片、內支撐膜層碎片、外支撐膜層碎片；Step 2: immersing the parent fragments in a chemical alkaline solvent for a predetermined time to dissolve the glue layer in the polarizing plate, simultaneously dissolving the iodine in the inner and outer support film layers, and causing the polarized body layer, the inner layer, The outer support film layer is phase-separated to form a plurality of polarizing body layer fragments, inner support film layer fragments, and outer support film layer fragments, respectively;

     步驟三：將經步驟二之該等碎片洗淨並脫水；透過洗淨與脫水，將該等溶解於化學鹼性溶劑中的膠層及碘與化學鹼性溶劑一同排出攪拌槽；而透過攪拌槽旋轉將多數個偏光本體層碎片、內支撐膜層碎片、外支撐膜層碎片離心脫水動作，使多數個偏光本體層碎片、內支撐膜層碎片、外支撐膜層碎片因與攪拌槽摩擦生熱，使該些偏光本體層碎片相聚集成一團狀物；Step 3: Washing and dehydrating the fragments in the second step; passing the washing and dehydrating, discharging the rubber layer and the iodine dissolved in the chemical alkaline solvent together with the chemical alkaline solvent, and discharging the stirring tank; The rotation of the groove causes a plurality of polarizing body layer fragments, inner support film layer fragments, and outer support film layer fragments to be centrifugally dehydrated, so that a plurality of polarizing body layer fragments, inner supporting film layer fragments, and outer supporting film layer fragments are caused by friction with the stirring tank. Heating, so that the polarized body layer fragments are aggregated into a mass;

     步驟四：移去相聚集的偏光本體層碎片的團狀物，即可得到剩餘物由三醋酸纖維素構成之內支撐膜層碎片、外支撐膜層碎片。Step 4: Remove the agglomerates of the collected polarized body layer fragments, thereby obtaining the inner support film layer fragments and the outer support film layer fragments composed of cellulose triacetate.

     如上所述之偏光板回收方法，其中，在步驟二中所述的浸泡時間為2～24小時。The polarizing plate recovery method as described above, wherein the soaking time described in the second step is 2 to 24 hours.

     本發明的有益效果在於：The beneficial effects of the invention are:

     1、藉由將該偏光板粉碎為尺寸較小的母碎片可增加接觸面積而增進處理效率，再利用化學鹼性溶劑溶解膠層及附著在偏光本體層中的染料，使偏光板母碎片分離為偏光本體層碎片、內支撐膜層碎片、外支撐膜層碎片，最後，透過脫水將不同的碎片材質分開收集回收，藉此，以提升該偏光板利用價值與減少廢棄物的產生。1. By pulverizing the polarizing plate into a small-sized mother chip, the contact area can be increased to improve the processing efficiency, and the chemical layer is used to dissolve the glue layer and the dye attached to the polarizing body layer to separate the mother plate of the polarizing plate. The polarizing body layer fragments, the inner supporting film layer fragments, and the outer supporting film layer fragments are finally collected and recovered separately by dehydration, thereby improving the utilization value of the polarizing plate and reducing the generation of waste.

     2、本發明因為係採用化學鹼性溶劑常溫浸泡，並不需要加熱，因此不會產生有害氣體，減少對環境的污染。2. The invention is immersed in a chemical alkaline solvent at room temperature and does not require heating, so no harmful gas is generated and environmental pollution is reduced.

     為令本發明所運用之技術內容、發明目的及其達成之功效有更完整且清楚的揭露，茲於下詳細說明之，並請一併參閱所揭之圖式及圖號：For a more complete and clear disclosure of the technical content, the purpose of the invention and the effects thereof achieved by the present invention, it is explained in detail below, and please refer to the drawings and drawings:

        本發明之偏光板回收方法中進行回收之偏光板係具有一偏光本體層（PVA,聚乙烯醇）、分別結合在該偏光本體層上、下表面之支撐膜層（TAC,三醋酸纖維素）、一結合在該其一支撐膜層上表面的表面保護膜層（PET, 聚對苯二甲酸乙二酯）、一結合在該另 一撐膜層下表面的膠層（PMMA,聚甲基丙烯酸甲酯）。請參看第二圖，係揭示本發明於進行回收偏光板之步驟流程圖，該回收步驟包括：The polarizing plate recovered in the method for recovering a polarizing plate of the present invention has a polarizing body layer (PVA, polyvinyl alcohol), and a supporting film layer (TAC, cellulose triacetate) respectively bonded to the upper and lower surfaces of the polarizing body layer. a surface protective film layer (PET, polyethylene terephthalate) bonded to the upper surface of the support film layer, a glue layer (PMMA, polymethyl group) bonded to the lower surface of the other support film layer Methyl acrylate). Referring to the second figure, a flow chart of the steps of the present invention for recovering a polarizing plate is disclosed. The recycling step includes:

     步驟一（Ｓ１）：粉碎。將偏光板進行粉碎，以形成多數個預定大小的母碎片；其中，該偏光板較佳情況係於粉碎機中進行粉碎；Step one (S1): smash. The polarizing plate is pulverized to form a plurality of mother chips of a predetermined size; wherein the polarizing plate is preferably pulverized in a pulverizer;

     步驟二（Ｓ２）：浸入化學鹼性溶劑溶解膠層與支撐膜層中之碘。將該等母碎片浸入於化學鹼性溶劑中，浸泡一預設時間，最佳為浸泡2～24小時，以溶解該偏光板中的膠層，同時將支撐膜層中之碘溶出，並使偏光本體層、支撐膜層相分離，以分別形成多數個偏光本體層碎片、支撐膜層碎片；其中，所述之化學鹼性溶劑較佳係選自氫氧化鈉、漂白水、丙酮或醇，最佳為氫氧化鈉；Step 2 (S2): immersing in a chemical alkaline solvent to dissolve the iodine in the adhesive layer and the support film layer. Immerse the mother fragments in a chemically alkaline solvent and soak for a predetermined period of time, preferably for 2 to 24 hours, to dissolve the glue layer in the polarizing plate, and simultaneously dissolve the iodine in the support film layer, and The polarizing body layer and the supporting film layer are separated to form a plurality of polarizing body layer fragments and supporting film layer fragments, wherein the chemical alkaline solvent is preferably selected from the group consisting of sodium hydroxide, bleach, acetone or alcohol. The best is sodium hydroxide;

     步驟三（Ｓ３）：洗淨、脫水，以去除膠層成分及碘。係將經步驟二之該等偏光本體層碎片、支撐膜層碎片置入攪拌槽內進行洗淨並脫水；透過洗淨與脫水，將該等溶解於化學鹼性溶劑中的膠層及碘與化學鹼性溶劑一同排出攪拌槽；而透過攪拌槽旋轉將多數個偏光本體層碎片、支撐膜層碎片離心脫水動作，使多數個偏光本體層碎片、支撐膜層碎片因與攪拌槽摩擦而生熱，由於偏光本體層碎片使用聚乙烯醇，而聚乙烯醇為水溶性高分子聚合物，因此經脫水受熱後，使該些偏光本體層碎片極容易相聚集成一團狀物；Step 3 (S3): Washing and dehydrating to remove the composition of the rubber layer and iodine. The polarized body layer fragments and the support film layer fragments in the second step are placed in a stirring tank for washing and dehydration; and the rubber layer and iodine dissolved in the chemical alkaline solvent are washed and dehydrated. The chemical alkaline solvent is discharged together with the stirring tank; and a plurality of polarizing body layer fragments and supporting film layer fragments are centrifugally dehydrated by rotation through the stirring tank, so that a plurality of polarizing body layer fragments and supporting film layer fragments are heated by friction with the stirring tank. Since the polarizing body layer fragments use polyvinyl alcohol, and the polyvinyl alcohol is a water-soluble high molecular polymer, after dehydration and heating, the polarized body layer fragments are easily aggregated into a mass;

     步驟四（Ｓ４）：移去相聚集之偏光本體層。最後移去相聚集的聚乙烯醇膜層碎片的團狀物，即可得到剩餘物由三醋酸纖維素構成之支撐膜層碎片。Step 4 (S4): The phased polarized body layer is removed. Finally, the agglomerates of the aggregated polyvinyl alcohol film layer fragments are removed to obtain a support film layer fragment composed of cellulose triacetate.

        透過本發明的回收方法確實能夠將該偏光板的各個膜層依材質種類分類回收，減少廢棄物的產生，而能符合環保需求。According to the recycling method of the present invention, it is possible to classify and recycle the respective film layers of the polarizing plate according to the material type, thereby reducing waste generation and meeting environmental protection requirements.

     以上所舉者僅係本發明之部份實施例，並非用以限制本發明，致依本發明之創意精神及特徵，稍加變化修飾而成者，亦應包括在本專利範圍之內。The above is only a part of the embodiments of the present invention, and is not intended to limit the present invention. It is intended to be included in the scope of the present invention.

     綜上所述，本發明實施例確能達到所預期之使用功效，又其所揭露之具體技術手段，不僅未曾見諸於同類產品中，亦未曾公開於申請前，誠已完全符合專利法之規定與要求，爰依法提出發明專利之申請，懇請惠予審查，並賜准專利，則實感德便。In summary, the embodiments of the present invention can achieve the expected use efficiency, and the specific technical means disclosed therein have not been seen in similar products, nor have they been disclosed before the application, and have completely complied with the patent law. The regulations and requirements, the application for invention patents in accordance with the law, and the application for review, and the grant of patents, are truly sensible.

    ＜本發明＞<present invention>

（Ｓ１）‧‧‧步驟一(S1)‧‧‧Step one

（Ｓ２）‧‧‧步驟二(S2)‧‧‧Step 2

（Ｓ３）‧‧‧步驟三(S3) ‧ ‧ Step 3

（Ｓ４）‧‧‧步驟四(S4)‧‧‧Step four

 ＜傳統＞<tradition>

（１）‧‧‧偏光板(1)‧‧‧Polar plate

（１１）‧‧‧偏光本體層(11) ‧‧‧ polarized body layer

（１２）‧‧‧外支撐膜層(12) ‧‧‧ outer support membrane

（１３）‧‧‧內支撐膜層(13) ‧ ‧ inner support membrane

（１４）‧‧‧表面保護膜層(14) ‧‧‧Surface protective film

（１５）‧‧‧膠層(15) ‧‧‧ glue layer

（１６）‧‧‧離型膜層(16) ‧‧‧ release film

    第一圖：傳統偏光板結構圖The first picture: the structure of the traditional polarizer

    第二圖：本發明偏光板回收之步驟流程圖Second: Flow chart of the steps of recycling the polarizing plate of the present invention

(S1)‧‧‧步驟一 (S1)‧‧‧Step one

(S2)‧‧‧步驟二 (S2)‧‧‧Step 2

(S3)‧‧‧步驟三 (S3) ‧ ‧ Step 3

(S4)‧‧‧步驟四 (S4)‧‧‧Step four

Claims (3)

一種偏光板回收方法，包含下列步驟： 步驟一：將偏光板予以粉碎，以成多數個預定大小的母碎片； 步驟二：將該等母碎片浸入於化學鹼性溶劑中一段預定時間，以溶解該偏光板中的膠層，同時將內、外之支撐膜層中之碘溶出，及使偏光本體層、支撐膜層相分離，以分別形成多數個偏光本體層碎片、支撐膜層碎片； 步驟三：將經步驟二之該等碎片置入攪拌槽內洗淨並脫水；透過洗淨與脫水，將該等溶解於化學鹼性溶劑中的膠層及碘與化學鹼性溶劑一同排出該攪拌槽；而透過該攪拌槽旋轉將多數個偏光本體層碎片、支撐膜層碎片離心脫水動作，使多數個偏光本體層碎片、支撐膜層碎片、因與攪拌槽摩擦生熱，使該些偏光本體層碎片相聚集成一團狀物； 步驟四：移去相聚集的偏光本體層碎片的團狀物，即可得到剩餘物由三醋酸纖維素構成之支撐膜層碎片。A method for recovering a polarizing plate comprises the following steps: Step 1: pulverizing a polarizing plate to form a plurality of female chips of predetermined size; Step 2: immersing the parent fragments in a chemical alkaline solvent for a predetermined time to dissolve The glue layer in the polarizing plate simultaneously dissolves iodine in the inner and outer support film layers, and separates the polarized body layer and the support film layer to form a plurality of pieces of polarized body layer and support film layer fragments respectively; 3: The chips in the second step are placed in a stirred tank to be washed and dehydrated; through washing and dehydration, the rubber layer and the iodine dissolved in the chemical alkaline solvent are discharged together with the chemical alkaline solvent. a plurality of polarizing body layer fragments and supporting film layer fragments are centrifugally dehydrated by the rotation of the stirring tank, so that a plurality of polarizing body layer fragments, supporting film layer fragments, and heat generated by friction with the stirring tank, and the polarizing bodies are made. The layer fragments are aggregated into a mass; Step 4: removing the agglomerates of the collected polarized body layer fragments, the residue is supported by cellulose triacetate Layer of debris. 如申請專利範圍第1項所述之偏光板回收方法，其中，於步驟二中之浸泡時間為2～24小時。The method for recovering a polarizing plate according to claim 1, wherein the soaking time in the second step is 2 to 24 hours. 如申請專利範圍第1或2項所述之偏光板回收方法，其中，於步驟二所述之化學鹼性溶劑係選自氫氧化鈉、漂白水、丙酮或醇其中之一。The method for recovering a polarizing plate according to claim 1 or 2, wherein the chemical alkaline solvent described in the second step is one selected from the group consisting of sodium hydroxide, bleach, acetone or alcohol.