本文選題：纖維管　切入點(diǎn)：偶聯(lián)劑　出處：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著社會(huì)的經(jīng)濟(jì)發(fā)展和人口增長(zhǎng),水資源短缺和水環(huán)境污染已成為制約我國(guó)經(jīng)濟(jì)和社會(huì)發(fā)展的重要因素。因此,為了而對(duì)惡化的水資源質(zhì)量與經(jīng)濟(jì)發(fā)展之間的矛盾,我們迫切的需要一種適合時(shí)代發(fā)展的水資源處理技術(shù),膜生物反應(yīng)器技術(shù)應(yīng)運(yùn)而生。傳統(tǒng)應(yīng)用于膜生物反應(yīng)器中的單質(zhì)聚偏氟乙烯中空纖維膜強(qiáng)度低,在面對(duì)惡劣的水環(huán)境下,難以滿足使用要求,纖維管增強(qiáng)聚偏氟乙烯中空纖維膜能夠很大程度上提升膜強(qiáng)度,但是由于纖維管與鑄膜液之間的結(jié)合強(qiáng)度不佳,在使用過(guò)程中經(jīng)水流沖擊及振蕩,增強(qiáng)膜界面層會(huì)產(chǎn)生剝離現(xiàn)象,大大影響了纖維管增強(qiáng)中空纖維膜的使用壽命,因此尋求在不影響增強(qiáng)膜自身性能條件下,增強(qiáng)膜界面結(jié)合情況的方法,具有十分重要的意義。首先,本文選取兩種纖維管:編織管、針織管,作為聚偏氟乙烯中空纖維膜增強(qiáng)體,采用兩種方法對(duì)纖維管進(jìn)行改性,1.分別使用偶聯(lián)劑KH570及丙烯酸酯粘合劑對(duì)兩種纖維管外表面進(jìn)行涂覆改性;2.采用不同低溫等離子體處理時(shí)間對(duì)兩種纖維管外表面進(jìn)行刻蝕,并通入氧氣,將少量親水基團(tuán)接枝在纖維管外表面,增加纖維管外表面親水性。實(shí)驗(yàn)討論了不同纖維管輸送速度、不同改性劑用量、不同低溫等離子體處理時(shí)間對(duì)未改性、改性纖維管增強(qiáng)膜水通量、孔隙率、平均孔徑、拉伸強(qiáng)度、爆破強(qiáng)度的影響。不同纖維管輸送速度對(duì)纖維管增強(qiáng)膜水通量、平均孔徑及孔隙率影響較大,對(duì)于纖維管增強(qiáng)膜拉伸強(qiáng)度影響較小。改性劑的用量對(duì)纖維管增強(qiáng)膜各項(xiàng)性能影響不一,過(guò)多或過(guò)少的改性劑用量都不能達(dá)到膜使用要求。低溫等離子體處理纖維管時(shí)間的長(zhǎng)短主要影響的是膜的界面結(jié)合情況。其次,對(duì)不同纖維管輸送速度、不同低溫等離子體處理纖維管時(shí)間、不同改性劑用量下的纖維管增強(qiáng)膜進(jìn)行相同條件的超聲波破壞作用,測(cè)得超聲波前后纖維管增強(qiáng)聚偏氟乙烯中空纖維膜水通量,討論了不同條件下紡制的膜絲的界面結(jié)合情況,結(jié)合增強(qiáng)膜綜合性能及超聲波前后水通量變化得出最優(yōu)工藝條件:KH570偶聯(lián)劑和丙烯酸酯粘合劑最佳用量皆為3 g/5m,低溫等離子體刻蝕編織管外表面最佳時(shí)間為10 min,低溫等離子體刻蝕針織管外表面最佳時(shí)間為15 min,使用改性劑的纖維管增強(qiáng)膜和未使用改性劑的編織管增強(qiáng)膜最佳輸送速度為15 m/min,未使用改性劑的針織管增強(qiáng)膜最佳針織管輸送速度為20 m/min。丙烯酸酯粘合劑對(duì)編織管增強(qiáng)膜界面結(jié)合改性效果最好,KH570偶聯(lián)劑對(duì)針織管增強(qiáng)膜界面結(jié)合改性效果最好。
[Abstract]:With the economic development and population growth of our society, water shortage and water environment pollution have become an important factor restricting the economic and social development of our country. We urgently need a kind of water resources treatment technology suitable for the development of the times. Membrane bioreactor (MBR) technology emerges as the times require. The membrane strength of PVDF hollow fiber used in membrane bioreactor is low, and in the face of harsh water environment, It is difficult to meet the requirements of application. The membrane strength can be greatly enhanced by the fiber vascular reinforced polyvinylidene fluoride hollow fiber membrane. However, due to the poor bonding strength between the fiber tube and the casting solution, the flow of water impinges and oscillates in the process of operation. The interfacial layer of the enhanced membrane will be stripped, which greatly affects the service life of the fiber tube reinforced hollow fiber membrane. Therefore, the method of enhancing the interfacial bonding of the membrane without affecting the performance of the enhanced membrane is sought. First of all, this paper selects two kinds of fiber tubes: braided tubes and knitted tubes as membrane reinforcements of polyvinylidene fluoride (PVDF) hollow fiber. Two methods were used to modify the fiber tube. 1. The external surface of the two kinds of fiber vascular tubes was coated with coupling agent KH570 and acrylate adhesive. The external surface of the two kinds of fiber vascular tubes was etched by different low temperature plasma treatment time. By adding oxygen, a small amount of hydrophilic groups were grafted onto the outer surface of the fiber tube to increase the hydrophilicity of the outer surface of the fiber tube. The effects of water flux, porosity, average pore size, tensile strength and blasting strength on the water flux, average pore size and porosity of the membrane reinforced by the modified fiber vascular tube were studied. The effect of the amount of modifier on the tensile strength of the fiber tube reinforced membrane is different, and the influence of the content of the modifier on the properties of the fiber tube reinforced film is different. Too much or too little modifier dosage can not meet the requirements of membrane use. The length of treatment time of low temperature plasma mainly affects the interfacial bonding of the membrane. Secondly, for different transfer speed of fiber tube, The water flux of polyvinylidene fluoride (PVDF) hollow fiber membrane was measured before and after the treatment with different low temperature plasma treatment time and different modifier dosage under the same conditions. The interfacial bonding of filaments spun under different conditions was discussed. Combined with the comprehensive properties of the enhanced membrane and the change of water flux before and after ultrasonic wave, the optimum technological conditions were obtained: the optimum dosage of the coupling agent and acrylic adhesive was 3 g / 5 m, the optimum time of etching the outer surface of the braided tube by low temperature plasma was 10 min, and the optimum time was low. The optimum temperature plasma etching time is 15 min, the optimum conveying speed of fiber tube reinforcement film using modifier and braided tube reinforcement film without modifier is 15 m / min, and that of knitting tube reinforcement film without modifier is 15 m / min. The transfer rate of knitted pipe is 20 m / min. The effect of acrylates adhesive on the interfacial modification of braided tube reinforced film is the best, and that of KH 570 coupling agent is the best.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB383.2

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