【正文】 刪除以下內(nèi)容， O(∩_∩)O謝謝?。?！ 2 Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese 為你提供優(yōu)秀的畢業(yè)論文設(shè)計參考資料，請您刪除一下內(nèi)容，O(∩_∩)O謝謝?。?！ National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。s Day! in shops, hotels and restaurants. But few young women will mark the festival with their boyfriends, or take part in traditional activities to pray for cleverness. A largescale of exhibition on the Silk Road opened to the public in the National Museum on Thursday. The exhibition displays more than 400 18 treasures from Shaanxi province, Gansu province and 14 other regions. It is largest scale exhibition that shows the history of the Silk Road in recent years. As APEC is going on in Beijing, the exhibit aims to show the world this brilliant section of history. The Silk Road is a series of trade and cultural transmission routes that were central to cultural interaction through regions of the Asian continent. It connected the West and East by linking traders, merchants, pilgrims, monks, soldiers, nomads, and urban dwellers from China and India to the Mediterranean Sea during various periods of time. I met my dear hubby in 2021 the second year I was in my school and it was the first year when he came here. We became colleagues. And there was nothing special happening during that year. He was just a kind and humble brother graduated from the same college as me. But we did not know each other till he became my colleague and his office desk was just in front of me. There was only a glass between us. So actually we could see each other when we both look up. But it is not the main reason that really draws us close. How we bee close to each other was something seems quite natural. We went out to play badminton with other colleagues and we sometimes chatted for a while. He is a man of few words but somehow sometimes will say something really humorous. Then one day, to my great surprise, I found a pot of beautiful flower on my desk. It was just the flower I had talked about with my colleague the other day, and I thought it was her who put the flower there. But the truth is not. It was the humble guy sitting in front of me. He just simply said ,”well, I caught sight of this flower and thought that it’s beautiful and you may like it”. I wonder why I was moved because of these simple words and present. Maybe it is the sincerity and the true self that impress me. I thanked him and some colleagues walked pa。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。感謝我的家人對我大學(xué)三年學(xué)習(xí)的默默支持；感謝我的母校重慶科技學(xué)院給了我在大學(xué)三年深造的機會，讓我能計息學(xué)習(xí)個提高；感謝重慶科技學(xué)院的老師和同學(xué)們?nèi)陙淼年P(guān)心和鼓勵。因此國內(nèi)應(yīng)盡快著手鹵化丁基橡膠生產(chǎn)技術(shù)的準備或引進工作，盡早投產(chǎn)，以便能盡早滿足國內(nèi)橡膠工業(yè)無內(nèi)胎輪胎等產(chǎn)品發(fā)展 用膠的需要。產(chǎn)品質(zhì) 量是產(chǎn)品競爭的關(guān)鍵因素。預(yù)計，未來段時間內(nèi) IIR 的市場價格將在高價格區(qū)域窄幅振蕩。由此可見， 我國 HIIR 的消費已成為 IIR 的發(fā)展方向。 12 近年來， 我國 IIR 供需情況見表 3 表 3 2021 年 ~2021 年我國 IIR 的供需情況 年份 產(chǎn)量 /萬 t 進口量 /萬 t 出口量 /萬 t 表觀消費量 /萬 t 年均增長率 /% 自給率 /% 2021 年 2021 年 2021 年 2021 年 2021 年 2021 年 2021 年 隨著汽車輪胎工業(yè)的不斷發(fā)展，我 IIR 的消費量顯著增加。由于國產(chǎn) IIR 一直不能滿足國內(nèi)需求 ,且 IIR 表現(xiàn)出的巨大盈利能力 ,促使國內(nèi)一些公司紛紛計劃新建／擴建 IIR 裝置。 5 揮發(fā)份 ≦ ％ (wt) ≦ ％ (wt) ≦ ％ (wt) 灰份 ≦ ％ (wt) ≦ ％ (wt) ≦ ％ (wt) 不飽和度 %(mol) %(mol) %(mol) 最大扭矩 MH 177。 2021 年和 2021 年產(chǎn)量分別只有 以及和 。 1959 年后，法國、英國、日本也開始生產(chǎn)丁基橡膠。 目前，世界各大公司均有意向擴大 IIR 產(chǎn)能以滿足全球 IIR 市場不斷增長的需求。但俄羅斯溶液法IIR 產(chǎn)品相對分子質(zhì)量分布較寬，分子鏈存在支化現(xiàn)象， 其產(chǎn)品性能與淤漿法產(chǎn)品還有一定的差距。迄今為止，示范裝置的關(guān)鍵設(shè)備 —— 國內(nèi)首臺長徑比 80： 1 的中型雙螺桿反應(yīng)擠出機組運行平穩(wěn)，所得產(chǎn)品 氯含量合格，產(chǎn)品質(zhì)量調(diào)節(jié)手段齊全。 國內(nèi)丁基橡膠技術(shù)現(xiàn)狀 盡管我國 IIR的研發(fā)始于 2O世紀 6O年代，但一直沒有建成工業(yè)化生產(chǎn)裝置。干法又名干混鹵化法，是將成品 IIR 和鹵化劑通過螺桿擠壓機，在機械剪切作用下對 IIR 進行鹵化。溶液法是以烷基 氯化鋁與水的絡(luò)合物為引發(fā)劑，在烴類溶劑 ( 如異戊烷 ) 中于 9 O ～ 7 0℃下，異丁烯和少量異戊二烯共聚而成，聚合釜的連續(xù)運行周期為 1 0 d ，聚合釜內(nèi)膠液中的干膠質(zhì)量分數(shù)在 12％以下。 ( 3 ) 回收循環(huán) :從閃蒸塔及真空脫氣塔頂出來的未反應(yīng)的單體和氯甲烷氣體冷卻除水 ,壓縮冷卻再脫水后， 經(jīng)中性氧化鋁或沸石分子篩干燥精制送入回收精餾塔。淤漿法生產(chǎn)技術(shù)主要包括聚合反應(yīng)、產(chǎn)品精制、回收、循環(huán)以及清釜 4 個部分。主要可用作輪胎的氣密層、胎側(cè)、內(nèi)胎、容器襯里、藥品瓶塞和膠墊等。但也限制了其與聚二烯烴橡膠的并用，此外，分子中缺少極性基團，也使其與金屬或橡膠的粘合 性能差，隨著合成橡膠工業(yè)發(fā)展和應(yīng)用的需要， IIR 現(xiàn)已開發(fā)成擁有衍生橡膠、改性橡膠、熱塑性彈性體和熱 塑性硫化膠等品種的通用橡膠?？刂莆廴镜姆椒?， 捏煉法脫硫丁基再生膠的生產(chǎn)過程只是在臨界溫度時，產(chǎn)生少量的霧化煙氣。溫度對門尼粘度的影響丁基再生膠的質(zhì)量好壞，其第一項物性指標是門尼粘度，然后才 是拉伸強度及拉斷伸長率。加工后的再生膠拉伸強度值，比加工前的平均值只下降了 ～ 。 二、設(shè)備投資少，一臺日產(chǎn) 7～ 8 噸丁基再 生膠的脫硫?qū)Ｓ媚鬅挋C，一次性投資只需 17 萬元。分析其原因主要是生產(chǎn)工藝方法落后，生產(chǎn)的丁基再生 橡 膠物性指標過于低下，只能低價賣，但生產(chǎn)廠家無利可圖，而且浪費了大量的寶貴資源。氣密性同原丁基橡膠一樣，比其它合成橡膠更好地保留原生膠的各種性能，所以丁基再生膠的經(jīng)營良好，是制造輪胎內(nèi)胎最佳選擇材料。 缺點： 硫化慢，加工性能較差。 丁基橡膠的特點分析及主要用途 丁基橡膠是合成橡膠的一種，由異丁烯和少量異戊二烯合成。