The results indicated that the dimension, shape and purity of base material could meet the functional demand of solid lubricant ; the thermal decomposition temperature of ptfe resin exceeds 400 c, but organic and inorganic packing filler added in ptfe made the water absorption rate of composite material increased, melting temperature and decomposition temperature decreased, in the meanwhile oxidative decomposition reaction was accompanied ; polar groups such as c = o, c - o - c and so on in the carbon fiber surface is advantageous to increase compatibility with other components and interlayer shearing strength ; uniform design experimental method could help to find the relationship between formula and frictional property by relatively small tests. the developing trend of each formula ' s friction coefficient could be showed by fitting curve ; the friction coefficient with no copper powder or graphite in formula was relatively big. this fact showed that copper powder and graphite should be used cooperatively ; it was found that when the ratio of copper powder to graphite by weight is 15 : 60, 30 : 30 - 40 and 60 : 15 - 30 respectively, the friction coefficient was relatively small. the degree of crystallinity of pure ptfe reached maximum by air cooling and the abrasion loss also reached maximum among three ones ; at the same time, the abrasion loss of solid lubricant sample was also the biggest among three ones ; when solid lubricant matched with 45 # steel axle or gcrl5 steel axle, lubricant transfer film could be formed on metal surface, thus direct contact between the surface of metal friction pair rings was reduced. their working life was elongated extremely ; there was mainly much graphite, a little ptff, moo3, feso4, cus and so on in lubricant transfer film
試驗結果表明:所選原料的尺寸、形狀及純度可滿足固體潤滑劑的性能要求;聚四氟
乙烯樹脂熱分解溫度超過400 ,但在ptfe中加入無機填料會使復合材料吸水率提高,熔融溫度及分解溫度降低,且伴有氧化分解反應;碳纖維表面含有c = o及c - o - c等極性
基團,有利於提高其與其它組分的相容性,提高層間剪切強度;均勻設計試驗方法能夠用較少的試驗
次數找出配方與摩擦性能間的關系,擬合曲線
基本能表示各配方的摩擦系數發展趨勢;配方中不加銅粉或不加石墨,其摩擦系數均較高,說明銅粉和石墨應該配合使用;當銅粉15份、石墨60份時,銅粉30份、石墨30 - 40份時,銅粉60 、石墨15 - 30份時,摩擦系數均具有較低值;純聚四氟
乙烯樹脂在空氣冷卻時結晶度最大,磨損量也是三者中最大的;同時,固體潤滑劑試樣在空氣冷卻時的磨損量也是三者中最大的:不論是固體潤滑劑與45 #鋼軸配副或是固體潤滑劑鑲嵌入銅套后與gcr15鋼軸配副,在金屬表面均可形成潤滑轉移膜,從而減少金屬摩擦副表面間的直接接觸,大大延長其使用壽命;轉移膜中主要含有較多的石墨、少量聚四氟
乙烯、 moo 。
Great wall brand urea is a credible quality product for consumers with well - known trade mark in the country and was as a product exempt from inspection approved by state quality supervision bureau in 2001 and 2004. ziyun brand civil explosive products is a famous brand of product in hebei province with high reputation in the national weapons industry. aaa brand ethylamine belongs to fine chemical products and its annual production ability ranks the third in the country
長城牌尿素產品為全國馳名商標,消費者信得過產品中國化工行業卓越品牌, 2001年2004年兩
次被國家質量監督局認定為尿素免檢產品紫雲牌民爆產品是河北省名牌,在全國兵器行業中有十分暢響的名份三a牌
乙基胺屬于精細化工產品,年產能力在全國位列第三晨光牌電石榮獲國家銀質獎省免檢和中國化工行業卓越品牌稱號晨光牌
乙炔炭黑是部優省優產品,技術水平和生產能力在全國均在前位旭光牌溶解
乙炔是省優和省質量信得過產品。
Chinese company had identified the additive as glycerin, a safe sweetener and thickener. but it was really diethylene glycol, a low - cost substitute commonly used in automobile antifreeze
一家中國公司將添加劑標注成甘油,這是一種安全的甜味劑和濃縮劑。然而實際是確實二
次乙基乙二醇,它作為一種廉價的替代品而被廣泛用作汽車的防凍劑。
In this part, the author makes a thorough discussion of shu block - printed version and zhe block - printed version which has been lost
明抄甲、
乙、丙、丁本編
次基本相同,收詩數量、結銜全同,應源於浙刻本。
Abstract : this paper researches into the complex adhesive , which was mainly made by the soy protein isolate ( spi ) and polyvinyl alcohol or polyvinyl acetate. different composition of protein and polymers can perform different characters, together with other ingredients. the factors, which are related to the first adhesive strength and adhesive strength, are mainly studied and discussed. the first adhesive strength of the complex adhesive is related to the content of spi, and the adhesive strength is related to the content of the complex adhesive. on the basis of the researching, we can make the plant fibre box for food in the future
文摘:對大豆分離蛋白?聚
乙烯醇、大豆分離蛋白?白乳膠復合膠粘劑進行了研究,採用不同混合比例及添加其他助劑,得到較好性能和可生物降解的復合膠粘劑,為製造一
次性植物纖維快餐盒打下
基礎.主要研究了影響這種復合膠粘劑粘接木塊的初粘力(剪切和拉伸強度)和粘接強度的因素,實驗表明: 9 . 2 %濃度的大豆分離蛋白的初粘力(剪切和拉伸強度)優於10 %濃度的聚
乙烯醇膠和33 %濃度的白乳膠;大豆分離蛋白復合膠粘劑的初粘力主要與大豆分離蛋白含量有關,其最終粘接強度與膠液固含量正相關
Acetaminophen users had the next highest risk, with an increased hypertension rate of 34 % when the drug was used six to seen times a week
服用對
乙酰氨
基酚的人還有以下高危風險,每周服用6至7
次會使血壓升高34 % 。
The ratio of tetraethyloxysilane ( teos ) : ethanol : distilled water is 1 : 3 : 4. n - n " dimethyl formamide ( dmf ) was used as solvent and drying control chemical additive ( dcca ) in a proportion of 0. 3 dmf / ethanol volume ratio. drops of hf / hc1 mixture acid was added to promote hydrolysis ( ph = 2 )
溶劑的選擇對
基質凝膠孔的形狀
基本沒有影響,但對其孔徑分佈有較大影響:在hf / hci混合酸催化情況下, dmf溶劑的樣品孔徑最小, dmf /
乙醇混合溶劑的其
次,
乙醇溶劑的樣品孔徑最大。
Abstract : the performance between the overseas vertical electric mis t precipitator and the ones guixi smelter made, which adopting homemade anti - co rrosive vinyl ester resin, was discussed ; meanwhile, the actual application resu lts were introduced
文摘:介紹貴溪冶煉廠首
次採用國產
乙烯
基酯耐蝕樹脂製造的方管型立式電除霧器,並就其性能同國外同型設備進行了比較,並介紹了其實際應用效果。
A sds - iso - propanol method suitable for tea plant, which was plentiful of tea polyphenols, had been developed using a modification of chen darning ' s method from different sample storage conditions such as fresh, dry and frozen shoots. it was a quick, easy, economical and effective method. the tactics were as follows : before the cell nuclear membranes were decomposed, the tea polyphenols and proteins etc. were removed
該法提取緩沖液使細胞維持一定的滲透壓,研磨時使細胞核
基本保持完整;在細胞核被裂解之前去除細胞質中的茶多酚、大部分蛋白質和rna ;而後用sds裂解細胞核,異丙醇或
乙醇沉澱dna ,這樣能經濟、快速和有效地從富含茶多酚、茶多糖等
次生物質的茶樹新梢中提取
基因組dna 。
Carboxyethyl ( phenyl ) phosphinic acid with the yield of 69. 2 % was synthesized from phosphorous trichloride, benzene, sodium chloride and acrylic acid
以三氯化磷、苯、三氯化鋁、氯化鈉、丙烯酸為原料合成了阻燃劑2 -羧
乙基苯
基次磷酸,收率69 . 2 % 。
Test method for determination of nitrilotriacetates in detergents
洗滌劑中測定
次氮
基三
乙酸酯的試驗方法
Test methods for determination of 1, 1, 1 - trichloroethane and methylene chloride content in stabilized trichloroethylene and tetrachloroethylene
測定穩定四氯乙烯中1 , 1 , 1 -三氯乙烯和次甲基氯化物含量的方法