CN115245798A - 一种γ-AlOOH溶胶及其制备方法与应用 - Google Patents
一种γ-AlOOH溶胶及其制备方法与应用 Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 44
- 229910002706 AlOOH Inorganic materials 0.000 title claims description 23
- 229910006636 γ-AlOOH Inorganic materials 0.000 claims abstract description 105
- 239000013078 crystal Substances 0.000 claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000010992 reflux Methods 0.000 claims abstract description 21
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000006185 dispersion Substances 0.000 claims abstract description 17
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 17
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002086 nanomaterial Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 16
- 239000012153 distilled water Substances 0.000 description 15
- 238000002156 mixing Methods 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- 239000007795 chemical reaction product Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 238000003980 solgel method Methods 0.000 description 4
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- -1 aluminum alkoxide Chemical class 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 101100203596 Caenorhabditis elegans sol-1 gene Proteins 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- WOZZOSDBXABUFO-UHFFFAOYSA-N tri(butan-2-yloxy)alumane Chemical compound [Al+3].CCC(C)[O-].CCC(C)[O-].CCC(C)[O-] WOZZOSDBXABUFO-UHFFFAOYSA-N 0.000 description 1
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- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
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Abstract
本申请公开了一种γ‑AlOOH溶胶及其制备方法与应用,属于无机纳米材料技术领域。该γ‑AlOOH溶胶的制备方法,包括下述步骤:(1)将拟薄水铝石滤饼溶于水中初步分散,加入浓硝酸后再次分散,回流后进行冷却得到γ‑AlOOH晶种;(2)将铝溶胶和γ‑AlOOH晶种在水中分散均匀,得到混合溶胶,所述混合溶胶进行水热反应,冷却后即得γ‑AlOOH溶胶。该制备方法工艺简单好操作,制备过程时间短,生产成本低,利于规模化生产γ‑AlOOH溶胶。
Description
技术领域
本申请涉及一种γ-AlOOH溶胶及其制备方法与应用,属于无机纳米材料技术领域。
背景技术
溶胶-凝胶(sol-gel)法是制备材料的一种湿化学法,是指以金属醇盐或无机盐为前驱体,经过溶液、溶胶、凝胶而固化,再经热处理制备氧化物或其它化合物的方法。溶胶-凝胶法具有制品纯度高、化学均匀性好、合成温度低、成分易控制、工艺设备简单等优点。溶胶-凝胶法可用于制备多种材料包括粉体、纤维、涂层及薄膜等。
用溶胶-凝胶法制备氧化铝微纳结构材料,一般是利用铝醇盐或无机铝盐为前驱体,经过水解和聚合反应,得到溶胶,再经浓缩或加入电解质得到透明凝胶,经干燥制得干凝胶,将干凝胶在不同温度条件下热处理,即可得氧化铝微纳结构材料,其中要精确控制pH值、浓度、反应温度、时间等条件。使用不同的前驱体,其主要区别在于水解聚合过程不同。
目前制备γ-AlOOH溶胶制备的原料主要包括有机醇铝(丁醇铝、异丙醇铝)、无机铝盐(氯化铝、硝酸铝等)和金属铝、纳米氧化铝、拟薄水铝石等。其中以有机醇铝和无机铝盐为原料,采用溶胶-凝胶法制备γ-AlOOH溶胶的过程,成胶反应时间及制备时间长,反应过程和浓度不易控制,不易实现工业化生产。
发明内容
为了解决上述问题,提供了一种γ-AlOOH溶胶及其制备方法与应用,该方法以硝酸为胶凝剂制得γ-AlOOH晶种,将该γ-AlOOH晶种和铝溶胶混合进行水热反应,能够促使铝溶胶转化为γ-AlOOH溶胶,整个制备过程时间短,生产成本低,工艺简单好操作,利于规模化生产γ-AlOOH溶胶。
根据本申请的一个方面,提供了一种γ-AlOOH溶胶的制备方法,包括下述步骤:
(1)将拟薄水铝石滤饼溶于水中初步分散,加入浓硝酸后再次分散,回流后进行冷却得到γ-AlOOH晶种;
(2)将铝溶胶和γ-AlOOH晶种在水中分散均匀,得到混合溶胶,所述混合溶胶进行水热反应,冷却后即得γ-AlOOH溶胶。
该制备方法反应条件温和,制备过程简单,易操作,便于工业化生产。
可选地,所述浓硝酸的质量分数不小于65%,所述拟薄水铝石滤饼中γ-AlOOH的含量为30~40%;
所述拟薄水铝石滤饼与所述浓硝酸的重量比为1:(0.06-0.09),优选为1:0.072。
上述拟薄水铝石滤饼与浓硝酸的重量比能够保证γ-AlOOH晶种的粒径为50-70nm,若比值过大,则粒径过大;若比值过小,溶液pH值过低,出现胶凝。
可选地,步骤(1)中,所述初步分散时间和所述再次分散时间均为2~3h;
所述回流温度为82~100℃,回流时间为8~12h。
步骤(1)中的初步分散能够保证拟薄水铝石滤饼中的γ-AlOOH充分分散至水中,提高水中γ-AlOOH的含量,再次分散能够保证水中γ-AlOOH和浓硝酸充分接触,便于回流中形成γ-AlOOH晶种,回流温度及时间的设置能够将γ-AlOOH晶种的粒径控制在60nm以内。
可选地,所述γ-AlOOH晶种的粒径为55~60nm,产率为82~85%,pH值为3.1~3.3。
可选地,步骤(2)中,所述铝溶胶中含有的氧化铝与所述γ-AlOOH晶种含有的氧化铝的重量比为1:(0.06-0.08),优选为1:0.0638。
上述重量比能够保证混合溶胶在水热反应时,铝溶胶在γ-AlOOH晶种的存在下顺利转化为γ-AlOOH溶胶,若重量比过大,则产物会出现胶凝;若重量比过小,则产物产率过低。
可选地,步骤(2)中,所述铝溶胶和γ-AlOOH晶种在水中的分散时间为2~3h,
所述水热反应的温度为240~280℃,时间为1~2h。
上述分散时间能够促使铝溶胶和γ-AlOOH晶种均匀分散在水中,水热温度与时间能够促使铝溶胶向γ-AlOOH溶胶转化,温度越高,γ-AlOOH溶胶的黏度越高,粒度越大;时间越长,γ-AlOOH溶胶的黏度越高,粒度越大。
可选地,所述铝溶胶的制备方法为:在硝酸铝中加入一定量氨水,室温下边搅拌边加氨水,硝酸铝与氨水摩尔比为1:2,4h后产生凝胶,立即加入硝酸,硝酸与硝酸铝的重量比例为0.05:1,85℃陈化10h后制得铝溶胶。
可选地,所述铝溶胶的固含量为12~14%,pH值为3.5~4,浊度小于3;优选的,所述铝溶胶的固含量为13.5%,pH值为3.7。
根据本申请的另一个方面,提供了一种γ-AlOOH溶胶,该γ-AlOOH溶胶由上述任一项所述的制备方法制得。
可选地,所述γ-AlOOH溶胶的黏度为0.3~0.7mPa·s,粒度为50~70nm,浊度为60~70。
优选的,所述γ-AlOOH溶胶的黏度为0.45~0.55mPa·s,粒度为55~60nm,浊度为65~67.5。所述γ-AlOOH溶胶的粒度越小,越有利于后续纤维前驱体溶胶的均一性,促进纤维和涂层的制备生产。
根据本申请的另一个方面,提供了上述所述的γ-AlOOH溶胶的应用,所述γ-AlOOH溶胶用于制备氧化铝陶瓷连续纤维和活性氧化铝涂层。
本申请的有益效果包括但不限于:
1)根据本申请的γ-AlOOH溶胶的制备方法,反应条件温和,过程简单,时间短,成本低,降低了能耗,安全性高,易于实现规模化生产。
2)根据本申请的γ-AlOOH溶胶的制备方法,应用生产过程不产生SO2、NO2、Cl2等对环境有害的气体,符合绿色化学的反应理念,在降低成本的基础上,降低对环境的污染。
3)根据本申请的γ-AlOOH溶胶的制备方法,各物质的重量比及反应条件均能够影响γ-AlOOH溶胶的黏度和粒度,故能够通过改变上述条件来控制γ-AlOOH溶胶的黏度和粒度,以适用于不同方面的应用。
4)根据本申请的γ-AlOOH溶胶,该生产得到的γ-AlOOH溶胶性质稳定,产品质量好,在长时间存放下,也不变质或聚沉,能用于氧化铝陶瓷连续纤维和活性氧化铝涂层材料等。
附图说明
此处所说明的附图用来提供对本申请的进一步理解,构成本申请的一部分,本申请的示意性实施例及其说明用于解释本申请,并不构成对本申请的不当限定。在附图中:
图1为本申请实施例1涉及的铝溶胶的XRD图。
图2为本申请实施例1涉及的γ-AlOOH溶胶烘干后的XRD图。
图3为本申请实施例1涉及的γ-AlOOH溶胶的TEM图。
图4为本申请实施例1涉及的γ-AlOOH溶胶的FT-IR图。
图5为本申请实施例1涉及的γ-AlOOH溶胶的TG/DSC图。
具体实施方式
下面结合实施例详述本申请,但本申请并不局限于这些实施例。
如无特别说明,本申请的实施例中的原料均通过商业途径购买。
本申请的实施例中分析方法如下:
黏度:
利用NDJ-1指针式黏度测试仪进行黏度分析,室温,样品用量为75.0mL。
粒度:
利用麦奇克S3500进行粒度分析,25℃,样品用量为10.0mL。
浊度:
利用哈希2100Q浊度仪进行浊度分析,室温,样品用量为20mL。
XRD:
利用布鲁克X-射线衍射仪进行XRD分析,室温,样品用量为5g。
TEM:
利用JEM-ARM200F原子级分辨率透射电子显微镜,室温,样品用量为10g。
FT-IR:
利用Nicolet iS5 FT-IR光谱仪,室温,样品用量为5g。
TG/DSC:
利用STA-200同步热分析仪,室温,样品用量为5g。
下述实施例涉及一种γ-AlOOH铝溶胶的制备方法,其中铝溶胶的制备方法为:在硝酸铝中加入一定量氨水,室温下边搅拌边加氨水,硝酸铝与氨水摩尔比为1:2,4h后产生凝胶,立即加入硝酸,硝酸与硝酸铝的重量比例为0.05:1,85℃陈化10h后制得铝溶胶。所述铝溶胶的固含量为13.5%,pH值为3.7,浊度小于3。
下述实施例中所使用的拟薄水铝石滤饼中γ-AlOOH的含量为30%。
实施例1
(1)γ-AlOOH晶种的制备
将866g拟薄水铝石滤饼溶解于29.134kg三次蒸馏水中初步分散2.5h,加入62.37g质量分数65%的浓硝酸,搅拌均匀,在20~25℃再次分散2h,将反应产物置于50L玻璃釜中回流,回流温度为90℃,回流8.5h,冷却后得到γ-AlOOH晶种。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与72.1g步骤(1)制备的γ-AlOOH晶种混合后,加入914g三次蒸馏水,25℃分散2h,得到混合溶胶,将481g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶1#。
实施例2
(1)γ-AlOOH晶种的制备
将200g拟薄水铝石滤饼溶解于1800g三次蒸馏水中初步分散2.5h,加入7.477g质量分数65%的浓硝酸,搅拌均匀,在20~25℃再次分散2h,将反应产物置于50L玻璃釜中回流,回流温度为90℃,回流8.5h,冷却后得到γ-AlOOH晶种。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与17.55g步骤(1)制备的γ-AlOOH晶种混合,所述铝溶胶中含有的氧化铝与所述γ-AlOOH晶种含有的氧化铝的重量比为1:0.048,加入662g三次蒸馏水,25℃分散2h,得到混合溶胶,将480g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶2#。
实施例3
(1)γ-AlOOH晶种的制备
同实施例2。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与23.30g步骤(1)制备的γ-AlOOH晶种混合,加入914g三次蒸馏水,25℃分散2h,得到混合溶胶,将475g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶3#。
实施例4
(1)γ-AlOOH晶种的制备
同实施例2。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与27.04g步骤(1)制备的γ-AlOOH晶种混合,加入914g三次蒸馏水,25℃分散2h,得到混合溶胶,将423.6g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶4#。
实施例5
(1)γ-AlOOH晶种的制备
同实施例2。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与27.52g步骤(1)制备的γ-AlOOH晶种混合,加入913g三次蒸馏水,25℃分散2h,得到混合溶胶,将480g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶5#。
实施例6
(1)γ-AlOOH晶种的制备
同实施例2。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与28.16g步骤(1)制备的γ-AlOOH晶种混合,加入900g三次蒸馏水,25℃分散2h,得到混合溶胶,将480.6g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶6#。
实施例7
(1)γ-AlOOH晶种的制备
将1401g拟薄水铝石滤饼溶解于28.59kg三次蒸馏水中初步分散2h,加入100.91g质量分数65%的浓硝酸,搅拌均匀,在20~25℃再次分散2h,将反应产物置于50L玻璃釜中回流,回流温度为90℃,回流8.5h,冷却后得到γ-AlOOH晶种。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与76g步骤(1)制备的γ-AlOOH晶种混合,加入911g三次蒸馏水,25℃分散2h,得到混合溶胶,将480.5g混合溶胶置于500mL反应釜中,280℃保温1h后,立即取出,冷却后得到γ-AlOOH溶胶7#。
实施例8
(1)γ-AlOOH溶液的制备
同实施例7。
(2)γ-AlOOH溶胶的制备
将250铝溶胶与76g步骤(1)制备的γ-AlOOH晶种混合,加入911g三次水,25℃分散2h,得到混合溶胶,将427.4g混合溶胶置于500mL反应釜中,280℃保温40min后,立即取出,冷却后得到γ-AlOOH溶胶8#。
实施例9
(1)γ-AlOOH晶种的制备
将200g拟薄水铝石滤饼溶解于1800g三次蒸馏水中初步分散1h,加入100.91g质量分数65%的浓硝酸,搅拌均匀,在20~25℃再次分散3.0h,将反应产物置于50L玻璃釜中回流,回流温度为100℃,回流7h,冷却后得到γ-AlOOH晶种。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与76g步骤(1)制备的γ-AlOOH晶种混合,加入911g三次蒸馏水,25℃分散1h,得到混合溶胶,将480.5g混合溶胶置于500mL反应釜中,250℃保温2h后,立即取出,冷却后得到γ-AlOOH溶胶9#。
实施例10
(1)γ-AlOOH晶种的制备
将200g拟薄水铝石滤饼溶解于1800g三次蒸馏水中初步分散3h,加入100.91g质量分数65%的浓硝酸,搅拌均匀,在20~25℃再次分散1.0h,将反应产物置于50L玻璃釜中回流,回流温度为80℃,回流12h,冷却后得到γ-AlOOH晶种。
(2)γ-AlOOH溶胶的制备
将250g铝溶胶与76g步骤(1)制备的γ-AlOOH晶种混合,加入911g三次蒸馏水,25℃分散3h,得到混合溶胶,将480.5g混合溶胶置于500mL反应釜中,300℃保温0.5h后,立即取出,冷却后得到γ-AlOOH溶胶10#。
对上述实施例1-10制备得到的γ-AlOOH溶胶1#-10#进行性能测试,测试结果见下表1。
表1
样品编号 | 黏度(mPa·s) | 粒度(nm) | 浊度(NTU) |
γ-AlOOH溶胶1# | 0.54 | 57.2 | 67.1 |
γ-AlOOH溶胶2# | 0.45 | 56.9 | 65.4 |
γ-AlOOH溶胶3# | 0.47 | 56.4 | 65.8 |
γ-AlOOH溶胶4# | 0.48 | 58.2 | 66.2 |
γ-AlOOH溶胶5# | 0.47 | 57.4 | 66.1 |
γ-AlOOH溶胶6# | 0.49 | 58.3 | 65.9 |
γ-AlOOH溶胶7# | 0.52 | 57.2 | 66.6 |
γ-AlOOH溶胶8# | 0.54 | 54.1 | 66.8 |
γ-AlOOH溶胶9# | 0.53 | 59.4 | 66.2 |
γ-AlOOH溶胶10# | 0.54 | 58.5 | 66.9 |
根据表1的内容可知,当AlOOH晶种与铝溶胶混合时,提高AlOOH晶种会增加产物的纳米粒度、浊度、黏度,此外,水热保温时间也会影响产物的黏度和粒度,保温时间减少时,会降低产物黏度和粒度,但若低于40min,可能会使产物晶化程度不够。实施例2与实施例1相比,减少了蒸馏水的用量,目的是为了减少成本,会略微增加晶种的粒度,但不影响后续使用生产。实施例8保温40min后,产物的黏度及粒度明显降低,但晶化程度不如保温1h的产物。
以上所述,仅为本申请的实施例而已,本申请的保护范围并不受这些具体实施例的限制,而是由本申请的权利要求书来确定。对于本领域技术人员来说,本申请可以有各种更改和变化。凡在本申请的技术思想和原理之内所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。
Claims (10)
1.一种γ-AlOOH溶胶的制备方法,其特征在于,包括下述步骤:
(1)将拟薄水铝石滤饼溶于水中初步分散,加入浓硝酸后再次分散,回流后进行冷却得到γ-AlOOH晶种;
(2)将铝溶胶和γ-AlOOH晶种在水中分散均匀,得到混合溶胶,所述混合溶胶进行水热反应,冷却后即得γ-AlOOH溶胶。
2.根据权利要求1所述的γ-AlOOH溶胶的制备方法,其特征在于,所述浓硝酸的质量分数不小于65%,所述拟薄水铝石滤饼中γ-AlOOH的固含量为30~40%;
所述拟薄水铝石滤饼与所述浓硝酸的重量比为1:(0.06-0.09),优选为1:0.072。
3.根据权利要求1所述的γ-AlOOH溶胶的制备方法,其特征在于,步骤(1)中,所述初步分散时间和所述再次分散时间均为2~3h;
所述回流温度为82~100℃,回流时间为8~12h。
4.根据权利要求1所述的γ-AlOOH溶胶的制备方法,其特征在于,步骤(2)中,所述铝溶胶中含有的氧化铝与所述γ-AlOOH晶种含有的氧化铝的重量比为1:(0.06-0.08),优选为1:0.0638。
5.根据权利要求1所述的γ-AlOOH溶胶的制备方法,其特征在于,步骤(2)中,所述铝溶胶和γ-AlOOH晶种在水中的分散时间为2~3h,
所述水热反应的温度为240~280℃,时间为1~2h。
6.根据权利要求1所述的γ-AlOOH溶胶的制备方法,其特征在于,所述铝溶胶的制备方法为:
在硝酸铝中加入一定量氨水,室温下边搅拌边加氨水,硝酸铝与氨水摩尔比为1:2,4h后产生凝胶,立即加入硝酸,硝酸与硝酸铝的重量比例为0.05:1,85℃陈化10h后制得铝溶胶。
7.根据权利要求1所述的γ-AlOOH溶胶的制备方法,其特征在于,所述铝溶胶的固含量为12~14%,pH值为3.5~4,浊度小于3;
优选的,所述铝溶胶的固含量为13.5%,pH值为3.7。
8.一种由权利要求1-7任一项所述的制备方法制得的γ-AlOOH溶胶。
9.根据权利要求8所述的γ-AlOOH溶胶,其特征在于,所述γ-AlOOH溶胶的黏度为0.3~0.7mPa·s,粒度为50~70nm,浊度为60~70;
优选的,所述γ-AlOOH溶胶的黏度为0.45~0.55mPa·s,粒度为55~60nm,浊度为65~67.5。
10.权利要求8或9所述的γ-AlOOH溶胶的应用,其特征在于,所述γ-AlOOH溶胶用于制备氧化铝陶瓷连续纤维和活性氧化铝涂层。
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