本文主要研究内容
作者王黎明（2019）在《发泡环境对聚烯烃发泡材料泡孔质量及表面质量的影响研究》一文中研究指出：微孔塑料因为可以减少原材料的使用同时保持制品优异力学性能,所以在汽车、家电等领域得到了广泛的应用。目前工业上最具应用前景的发泡成型方式为微孔注塑发泡,微孔注塑发泡根据气体产生的方式分为物理发泡和化学发泡,其中物理发泡法需要对注塑机进行改造,成本较高,而化学发泡法只需要简单的注塑机即可。目前,释压成型和欠注成型是微孔注塑发泡成型的主要方式,释压成型制品虽然具有泡孔尺寸较小、泡孔密度较高、泡孔规整度好的优点,但其不能够成型比较复杂的制件,在工业上的应用受到了一定的限制;而欠注发泡能够成型形状比较复杂的制件,在工业应用上具有良好的前景。欠注注塑发泡成型虽然应用前景比较好,但也存在泡孔易变形、制品表面缺陷明显等缺点,进而限制了其在实际生产中的进一步应用。因此,揭示出泡孔恶化和表面缺陷的形成机理并对其进行调控,制备出具有较好泡孔质量和表面质量的制品是目前欠注注塑成型方式所要解决的主要问题。本文通过分析欠注发泡和释压发泡的发泡环境的影响因素,研究欠注成型方式逼近释压成型发泡环境的方式,进而分析欠注成型发泡环境对微发泡聚丙烯材料泡孔变形和表面缺陷的影响;同时通过引入反压气体和改变模具循环温度,研究其对微发泡聚丙烯材料泡孔质量和表面质量的变化规律,揭示出影响发泡聚烯烃材料泡孔质量和表面质量的作用机理。论文主要研究成果如下:(1)对比释压发泡和欠注发泡成型方式下的泡孔质量,释压发泡试样的泡孔直径较小,泡孔尺寸均一,减重为10.5%的时候泡孔直径为36.84μm。而欠注注塑发泡试样的泡孔易变形。试样减重为11.7%时,泡孔直径为50.33μm。(2)通过分析欠注与释压成型发泡过程的中环境差异,得到影响欠注成型发泡泡孔质量的主要因素为熔体内压力和熔体的迁移距离。释压成型过程中未开模之前熔体压力较高,泡孔在动模微开模之后形成,熔体迁移距离为短程迁移,对泡孔形貌影响小,泡孔质量较好;欠注成型过程熔体内压力较小,泡孔在熔体进入型腔时已经产生,泡孔随熔体迁移距离越长,泡孔变形度越大,泡孔质量越差。通过气体反压技术使熔体内压力增加,改变欠注成型发泡的发泡环境,进而改善泡孔质量。实验证明气体反压可以改善泡孔形貌,欠注量越大,泡孔形貌越差,所需改善泡孔形貌的反压越大。欠注发泡条件下,当制品减重为11.72%时,需要0.3MPa的气体反压抑制泡孔变形;当减重为14.92%时,需要0.4MPa的反压才能抑制泡孔的变形;而当减重为20.28%时,气体反压提高到0.6MPa时依然不能抑制泡孔的变形。(3)气体反压抑制了熔体前沿泡孔的成核与长大,降低了泡孔破裂数量,改善表面质量。反压越大,欠注发泡试样表面质量越好,制品表面光泽度由0MPa反压下的12.64到0.6MPa反压下的16.18,提高了28%。反压的引入在改善表面质量的同时也产生了新的表面凹坑缺陷,通过提高模具温度和反压气体温度,可以有效消除凹坑。在模具温度为100℃时,丙烯腈-丁二烯-苯乙烯共聚物(ABS)发泡试样表面的凹坑得以消除。当反压气体温度为200℃时,PP发泡试样表面的凹坑可以得到明显的抑制。
Abstract
wei kong su liao yin wei ke yi jian shao yuan cai liao de shi yong tong shi bao chi zhi pin you yi li xue xing neng ,suo yi zai qi che 、jia dian deng ling yu de dao le an fan de ying yong 。mu qian gong ye shang zui ju ying yong qian jing de fa pao cheng xing fang shi wei wei kong zhu su fa pao ,wei kong zhu su fa pao gen ju qi ti chan sheng de fang shi fen wei wu li fa pao he hua xue fa pao ,ji zhong wu li fa pao fa xu yao dui zhu su ji jin hang gai zao ,cheng ben jiao gao ,er hua xue fa pao fa zhi xu yao jian chan de zhu su ji ji ke 。mu qian ,shi ya cheng xing he qian zhu cheng xing shi wei kong zhu su fa pao cheng xing de zhu yao fang shi ,shi ya cheng xing zhi pin sui ran ju you pao kong che cun jiao xiao 、pao kong mi du jiao gao 、pao kong gui zheng du hao de you dian ,dan ji bu neng gou cheng xing bi jiao fu za de zhi jian ,zai gong ye shang de ying yong shou dao le yi ding de xian zhi ;er qian zhu fa pao neng gou cheng xing xing zhuang bi jiao fu za de zhi jian ,zai gong ye ying yong shang ju you liang hao de qian jing 。qian zhu zhu su fa pao cheng xing sui ran ying yong qian jing bi jiao hao ,dan ye cun zai pao kong yi bian xing 、zhi pin biao mian que xian ming xian deng que dian ,jin er xian zhi le ji zai shi ji sheng chan zhong de jin yi bu ying yong 。yin ci ,jie shi chu pao kong e hua he biao mian que xian de xing cheng ji li bing dui ji jin hang diao kong ,zhi bei chu ju you jiao hao pao kong zhi liang he biao mian zhi liang de zhi pin shi mu qian qian zhu zhu su cheng xing fang shi suo yao jie jue de zhu yao wen ti 。ben wen tong guo fen xi qian zhu fa pao he shi ya fa pao de fa pao huan jing de ying xiang yin su ,yan jiu qian zhu cheng xing fang shi bi jin shi ya cheng xing fa pao huan jing de fang shi ,jin er fen xi qian zhu cheng xing fa pao huan jing dui wei fa pao ju bing xi cai liao pao kong bian xing he biao mian que xian de ying xiang ;tong shi tong guo yin ru fan ya qi ti he gai bian mo ju xun huan wen du ,yan jiu ji dui wei fa pao ju bing xi cai liao pao kong zhi liang he biao mian zhi liang de bian hua gui lv ,jie shi chu ying xiang fa pao ju xi ting cai liao pao kong zhi liang he biao mian zhi liang de zuo yong ji li 。lun wen zhu yao yan jiu cheng guo ru xia :(1)dui bi shi ya fa pao he qian zhu fa pao cheng xing fang shi xia de pao kong zhi liang ,shi ya fa pao shi yang de pao kong zhi jing jiao xiao ,pao kong che cun jun yi ,jian chong wei 10.5%de shi hou pao kong zhi jing wei 36.84μm。er qian zhu zhu su fa pao shi yang de pao kong yi bian xing 。shi yang jian chong wei 11.7%shi ,pao kong zhi jing wei 50.33μm。(2)tong guo fen xi qian zhu yu shi ya cheng xing fa pao guo cheng de zhong huan jing cha yi ,de dao ying xiang qian zhu cheng xing fa pao pao kong zhi liang de zhu yao yin su wei rong ti nei ya li he rong ti de qian yi ju li 。shi ya cheng xing guo cheng zhong wei kai mo zhi qian rong ti ya li jiao gao ,pao kong zai dong mo wei kai mo zhi hou xing cheng ,rong ti qian yi ju li wei duan cheng qian yi ,dui pao kong xing mao ying xiang xiao ,pao kong zhi liang jiao hao ;qian zhu cheng xing guo cheng rong ti nei ya li jiao xiao ,pao kong zai rong ti jin ru xing qiang shi yi jing chan sheng ,pao kong sui rong ti qian yi ju li yue chang ,pao kong bian xing du yue da ,pao kong zhi liang yue cha 。tong guo qi ti fan ya ji shu shi rong ti nei ya li zeng jia ,gai bian qian zhu cheng xing fa pao de fa pao huan jing ,jin er gai shan pao kong zhi liang 。shi yan zheng ming qi ti fan ya ke yi gai shan pao kong xing mao ,qian zhu liang yue da ,pao kong xing mao yue cha ,suo xu gai shan pao kong xing mao de fan ya yue da 。qian zhu fa pao tiao jian xia ,dang zhi pin jian chong wei 11.72%shi ,xu yao 0.3MPade qi ti fan ya yi zhi pao kong bian xing ;dang jian chong wei 14.92%shi ,xu yao 0.4MPade fan ya cai neng yi zhi pao kong de bian xing ;er dang jian chong wei 20.28%shi ,qi ti fan ya di gao dao 0.6MPashi yi ran bu neng yi zhi pao kong de bian xing 。(3)qi ti fan ya yi zhi le rong ti qian yan pao kong de cheng he yu chang da ,jiang di le pao kong po lie shu liang ,gai shan biao mian zhi liang 。fan ya yue da ,qian zhu fa pao shi yang biao mian zhi liang yue hao ,zhi pin biao mian guang ze du you 0MPafan ya xia de 12.64dao 0.6MPafan ya xia de 16.18,di gao le 28%。fan ya de yin ru zai gai shan biao mian zhi liang de tong shi ye chan sheng le xin de biao mian ao keng que xian ,tong guo di gao mo ju wen du he fan ya qi ti wen du ,ke yi you xiao xiao chu ao keng 。zai mo ju wen du wei 100℃shi ,bing xi jing -ding er xi -ben yi xi gong ju wu (ABS)fa pao shi yang biao mian de ao keng de yi xiao chu 。dang fan ya qi ti wen du wei 200℃shi ,PPfa pao shi yang biao mian de ao keng ke yi de dao ming xian de yi zhi 。
论文参考文献
论文详细介绍
论文作者分别是来自贵州大学的王黎明，发表于刊物贵州大学2019-07-16论文，是一篇关于欠注成型论文,气体反压论文,模具温度论文,泡孔质量论文,表面质量论文,贵州大学2019-07-16论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自贵州大学2019-07-16论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：欠注成型论文; 气体反压论文; 模具温度论文; 泡孔质量论文; 表面质量论文; 贵州大学2019-07-16论文;