排序方式: 共有17条查询结果,搜索用时 15 毫秒
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稀释剂粉末压片-X射线荧光光谱法测定锑矿石中锑及主量组分 总被引:1,自引:0,他引:1
利用X射线荧光光谱仪结合稀释剂粉末压片法来测定锑矿石中锑及主量组分。通过稀释剂的加入,减弱了样品的基体效应。人工配制了一系列具有浓度梯度的样品来解决标准样品个数偏少的问题。方法简便、实用,具有较高的精密度和准确度,测定结果满足实际工作需要。方法的相对标准偏差(RSD)为0.19%~2.0%,与常规分析结果基本一致。 相似文献
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Influences of some electrolyte impurities within starch and starch cationization on the adhesion of quaternary ammonium cornstarch to cotton and polyester fibers were investigated. The electrolytes considered included NaCI, Na2SO4, NaH2PO4 and Na2HPO4. The adhesion to fibers was evaluated in terms of maximum strength and work-to-break of the roving sized with the starch pastes containing electrolytes. It was found that the cationization showed a positive effect on the adhesion to both fibers whereas the electrolytes gave an adverse effect and reduced the adhesion. The adverse effect depends on the type and amount of electrolytes. The influence of electrolytes on the adhesion can be ranked in a series of NaH2PO4〉 Na2 HPO4〉 Na2SO4 〉 NaCl. The adhesion enhances as the modification extent increases and the electrolyte content decreases. Furthermore, the adverse effect can be compensated by the positive effect of the starch modification even at a low modification extent. If the electrolytes are fully eliminated, the cationic starch can increase the adhesion strength by more than 10% for both fibers. 相似文献
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通过选择合适单体和配比,运用乳液聚合方法合成的丙烯酸类浆料,在PH值7.5、总含固率25%时,为透明冻胶状产品。在上浆浓度范围内,该浆料浆液粘度大小适宜,经粘附力和对涤棉纱上浆后浆纱性能测定,该浆料在粘附、耐磨、强伸、吸湿诸项性能上都优于PVA,可取代PVA用于涤棉上浆。 相似文献
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In this paper, glucose was used as a green reducing agent and a capping reagent in the synthesis of water dispersible graphene, while using exfoliated graphite oxide (GO) as the precursor with the modified Hummers method. Characterizations of the graphene were conducted by UV-visihle absorption spectroscopy and X-ray diffraction (XRD). Then the spunlaid-melthlowing-spuulaid (SMS) nonwovens were treated with the graphene solution via pad-dry-cure process. The surface and the antistatic property of the obtained nonwovens were tested. The results showed that O. 1 mg/mL graphene solution exhibited good stability in water. When treated with this solution, the graphene could be evenly dispersed on SMS nonwovens and the nonwovens had an excellent antistatic performance and a high relatively antistatic durability. 相似文献
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高浓低粘浆料粘度与粘附力研究 总被引:3,自引:0,他引:3
郭腊梅 《东华大学学报(自然科学版)》2001,27(1):29-32
从浆料分子构成和相对分子质量两个本质因素分析浆料粘度和粘附力与它们的关系,并用实验表明了这种关系,指出浆料在常压上浆时,粘度和粘附力矛盾关系不显现,在高压上浆时,高浓低粘浆料的粘度和粘附力矛盾关系突出。控制浆料分子适合的相对分子质量可缓和这对矛盾。 相似文献
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郭腊梅 《东华大学学报(自然科学版)》2001,27(3):96-99
高含固量的液体聚丙烯酸酯浆料是通过乳液聚合方法,控制亲水水单体含量和调节浆料相对分子质量而制成,所得浆料为乳白色流动液体,经浆纱性能等测试,将料粘度低、粘附力高、吸湿低、稳定性、增强率、保伸性和退浆性都很好。 相似文献