本文選題：天然橡膠　切入點：堿木質素　出處：《青島科技大學》2016年碩士論文　論文類型：學位論文

【摘要】：堿木質素作為一種耐老化、價格低廉、環(huán)保等綜合性能良好的新型填料被應用于橡膠中受到廣泛重視,但由于其表面具有極性基團,在非極性橡膠中的分散性差,因此,開發(fā)出合理的改性方式對于提高其在非極性橡膠中的分散效果具有重要的意義。本文詳細考察了兩種處理方法改性的堿木質素填充天然橡膠的規(guī)律,采用動態(tài)熱處理和預分散處理技術,以馬來酸酐(MAH)或硅烷偶聯(lián)劑(Si69)作處理劑對堿木質素進行了表面改性處理,并通過橡膠加工分析儀考察了混煉膠內(nèi)填料網(wǎng)絡結構特性對其動態(tài)力學性能的影響,并用掃描電鏡觀察了硫化膠的微觀結構特性。結果表明:堿木質素在天然橡膠中幾乎沒有填料-填料相互作用,并且結合膠含量非常低,其Payne效應主要依賴于橡膠-橡膠間的相互作用。硫化膠的力學性能均隨堿木質素用量的增大而降低,而耐老化性隨其用量的增加而增加;堿木質素與炭黑并用時,當堿木質素用量為10phr(兩者比例1:4)時,橡膠的動態(tài)力學性能、混煉特性、門尼粘度、力學性能與全炭黑填充的均相近。隨填料中堿木質素比例增大,與全炭黑填充的橡膠相比各項性能下降明顯。所以在炭黑填充的體系中,可以用少量堿木質素代替,既環(huán)保節(jié)約,又能在基本維持力學強度的前提下改善橡膠的耐熱氧老化性能;接下來對堿木質素采用動態(tài)熱處理,發(fā)現(xiàn)AL1-MAH膠料的力學性能明顯好于AL1-Si69膠料,經(jīng)動態(tài)力學性能分析,AL1-MAH膠料相對于AL1-Si69膠料來說儲能模量最高,損耗模量最低,所以MAH改性效果優(yōu)于Si69改性;最后采用兩種處理方式,并以MAH作為改性劑,研究發(fā)現(xiàn)堿木質素采用動態(tài)熱處理的效果不如預分散處理,預分散處理過程雖復雜,但預分散處理能讓堿木質素的羥基官能團有更多的機會與MAH在分子水平進行反應。因此填充預分散處理堿木質素膠料的交聯(lián)密度、結合膠、儲能模量、綜合力學性能高于動態(tài)熱處理。并且當MAH用量為3份時混煉膠的儲能模量最高,損耗模量最低。硫化膠的拉伸強度、撕裂強度、耐磨性、定伸應力最好,但是耐老性能變差。
[Abstract]:Alkali lignin as a kind of aging resistance, low price, good environmental protection performance of new packing is applied to rubber received extensive attention, but because of its surface with polar groups in nonpolar rubber in dispersion, therefore, develop a reasonable modification for improving is important in the non-polar rubber dispersion effect. This paper analyzes the two kinds of processing methods of Modified Alkali Lignin filled natural rubber by dynamic law, heat treatment and pre dispersing technology, maleic anhydride (MAH) or silane coupling agent (Si69) for the treatment of alkali lignin by agent surface modification by rubber processing analyzer was investigated in the mixed effect of rubber filler network structure characteristics on the dynamic mechanical properties, and to observe the microstructure characteristics of vulcanized rubber by SEM. The results show that the alkali lignin in natural Almost no rubber filler filler interactions, and the bound rubber content is very low, the interaction effect of Payne mainly depends on the rubber - rubber. The mechanical properties of vulcanizates with alkali lignin content decreased, and increased resistance to aging and increase its amount of alkali lignin and carbon black; and, when the alkali lignin content was 10phr (ratio 1:4), dynamic mechanical properties of rubber, mixing characteristics, Mooney viscosity, mechanical properties and full filled with carbon black were similar. With the filling of alkali lignin ratio increased, compared with the carbon black filled rubber performance decreased significantly. So in carbon black filled system, you can use a small amount of alkali lignin, both environmental conservation, and to maintain the basic premise in the mechanical strength of the improved thermal oxidative aging of rubber properties; then the alkali lignin by dynamic heat treatment, AL1-MA The mechanical properties of H compound was significantly better than that of AL1-Si69 compound, analysis of the dynamic mechanical properties of AL1-MAH compound, AL1-Si69 compound is relative to the highest storage modulus, loss modulus minimum, so the modification effect of MAH is better than Si69 modified; finally using two kinds of treatment methods, and using MAH as modifier, the study found that alkali lignin by dynamic heat treatment effect than pre dispersing, pre dispersing process is complex, but pre dispersing can make alkali lignin hydroxyl groups have more chance to react with MAH at the molecular level. Therefore, filling predispersing at the crosslink density of rubber, pigment and lignin based adhesive, energy storage modulus, comprehensive mechanical properties are better than that of dynamic heat treatment. And when MAH was 3 phr mix highest storage modulus, loss modulus of vulcanized rubber. The lowest tensile strength, tear strength, abrasion resistance, tensile stress of the good, but the old resistance of It can change.

【學位授予單位】：青島科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TQ332;O636.2

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