【摘要】：熱敏記錄紙作為一類(lèi)信息記錄材料,具有打印裝置小巧靈活、打印耗材單一便宜、打印操作簡(jiǎn)單方便、打印過(guò)程安靜快速、打印產(chǎn)品精細(xì)清晰等特點(diǎn),在傳真通信、醫(yī)學(xué)成像、金融票據(jù)、物流標(biāo)簽等領(lǐng)域得到了廣泛的使用。但熱敏紙圖像穩(wěn)定性差的特點(diǎn)對(duì)其應(yīng)用也有著眾多的限制,而隨著熱敏紙應(yīng)用范圍的不斷拓展,對(duì)高圖像穩(wěn)定性的防護(hù)型熱敏紙的需求也越發(fā)強(qiáng)烈。針對(duì)普通熱敏紙發(fā)色及防護(hù)性能,首次提出了通過(guò)求取飽和光密度值“變異系數(shù)”來(lái)量化評(píng)價(jià)熱敏紙發(fā)色均勻性的方法,并用于指導(dǎo)熱敏涂料配方的設(shè)計(jì)優(yōu)化。通過(guò)對(duì)熱敏涂料中BON、顯色劑、隱色染料、填料等的種類(lèi)和用量對(duì)熱敏紙發(fā)色和防護(hù)性能的影響的研究,結(jié)果表明采用D8s顯色劑,控制BON對(duì)發(fā)色組分的比例為1:4.2,碳酸鈣對(duì)煅燒土的比例為4.1:1時(shí),制得的普通熱敏紙能獲得較好的打印效果和防護(hù)性能。但僅對(duì)熱敏層的配方進(jìn)行優(yōu)化還遠(yuǎn)不能滿(mǎn)足國(guó)標(biāo)對(duì)熱敏紙防護(hù)性能的要求。頂涂層對(duì)熱敏紙的防護(hù)性能起到關(guān)鍵作用。本文設(shè)計(jì)了以苯丙乳液為主要組分的頂涂涂料,通過(guò)在熱敏紙表面涂布一層保護(hù)層的方式來(lái)改進(jìn)普通熱敏紙的防護(hù)性能。頂涂涂料優(yōu)化實(shí)驗(yàn)中發(fā)現(xiàn),通過(guò)加入碳酸鈣填料可以改善熱敏紙打印過(guò)程中的走行穩(wěn)定性,同時(shí)因?yàn)樘盍显陧斖繉又械摹皷艡凇毙?yīng),延長(zhǎng)了分子擴(kuò)散的路徑,對(duì)頂涂后熱敏紙的防護(hù)性能也有一定提升。PDA實(shí)驗(yàn)結(jié)果表明使用交聯(lián)劑能夠獲得更加致密的頂涂層,從而提升頂涂后熱敏紙的防護(hù)性能。采用氮雜環(huán)丙烷化合物和碳酸鋯銨作為交聯(lián)劑制得的頂涂熱敏紙對(duì)水、植物油和酒精的防護(hù)性能已經(jīng)完全能夠滿(mǎn)足國(guó)標(biāo)中的要求。此外,頂涂后的熱敏紙不需壓光也能獲得極高的平滑度,而通過(guò)不同交聯(lián)劑的復(fù)配使用則能實(shí)現(xiàn)對(duì)熱敏紙的印刷適性的優(yōu)化。通過(guò)TEMPO氧化法和均質(zhì)處理制備了納米原纖化纖維(NFC),AFM照片顯示制得的NFC直徑在10~30nm左右。采用自然干燥的方法,通過(guò)NFC表面羥基間的氫鍵作用相互間緊密堆積從而制得致密連續(xù)的膜,對(duì)這種NFC膜的研究表明NFC膜對(duì)有機(jī)溶劑具有良好的穩(wěn)定性和抗?jié)B透性能�；谶@一特性,本文首次將NFC作為保護(hù)層涂布在普通熱敏紙表面,涂布量為4g/m2。研究發(fā)現(xiàn)制得的NFC頂涂熱敏紙具有優(yōu)異的抗有機(jī)溶劑特性、運(yùn)行適性和印刷適性。
[Abstract]:As a kind of information recording material, thermal recording paper is characterized by small and flexible printing device, simple and cheap printing consumables, simple and convenient printing operation, quiet and fast printing process, fine and clear printing products, etc., in facsimile communication, medical imaging, etc. Financial instruments, logistics labels and other fields have been widely used. However, the poor image stability of thermal paper has many limitations on its application, and with the continuous expansion of the application of thermal paper, the demand for high image stability protective thermal paper is becoming more and more intense. Aiming at the color and protection performance of common thermosensitive paper, the method of evaluating the color homogeneity of heat sensitive paper by calculating the "coefficient of variation" of saturated optical density is put forward for the first time, which can be used to guide the design and optimization of heat sensitive coating formulation. The effects of the types and contents of BON, cryptic dyes and fillers on the color and protective properties of thermistor paper were studied. The results showed that the proportion of BON to chromogenic component was 1: 4.2 by using D8s chromogenic agent. When the ratio of calcium carbonate to calcined soil is 4.1: 1, the general thermal sensitive paper can obtain better printing effect and protective performance. However, the formulation of thermal sensitive layer can not meet the requirements of national standards for thermal protection performance. Top coating plays a key role in the protective performance of thermal sensitive paper. In this paper, a top coating with styrene-acrylic emulsion as the main component is designed to improve the protective performance of common thermal paper by coating a protective layer on the surface of thermal paper. In the optimization experiment of top coating, it is found that adding calcium carbonate filler can improve the running stability of thermal paper during printing, and because of the "fence" effect of filler in top coating, the molecular diffusion path is prolonged. The results of PDA experiments show that a more compact top coating can be obtained by using crosslinking agent to improve the protective performance of the top coated thermistor paper. The protective properties of water, vegetable oil and alcohol prepared by using heterocyclic propane compound and ammonium zirconate as crosslinking agent can fully meet the requirements of national standard. In addition, the heat sensitive paper with top coating can obtain high smoothness without calendering, and the printing adaptability of thermal paper can be optimized by the combination of different crosslinking agents. By TEMPO oxidation and homogenization treatment, the NFC diameter of nanofibrillar fiber was about 10~30nm, which was obtained by (NFC), AFM photo display. By using natural drying method, a compact and continuous NFC film was prepared by the close accumulation of hydrogen bonds between hydroxyl groups on the surface of NFC. The study of this kind of NFC film shows that the NFC membrane has good stability and permeability to organic solvents. Based on this characteristic, NFC is first used as a protective coating on the surface of common thermal paper with a coating amount of 4 g / m ~ (2). It is found that the NFC top coated thermosensitive paper has excellent resistance to organic solvent, running adaptability and printing adaptability.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TS761

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本文編號(hào)：2367094