CN107057810A - 一种高稳定性磁流变液 - Google Patents
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Abstract
本发明公开了一种高稳定性磁流变液,由磁性颗粒、载液、表面活性剂、触变剂、抗氧化剂和抗磨剂组成,按重量百分比计:磁性颗粒75%~85%,载液15%~25%,表面活性剂0.3%~1%,触变剂0.3%~1%,抗氧化剂0.3%~1%,抗磨剂0.3%~1%。本发明以矿物油或聚α烯烃合成油为载液,对许多有利添加剂的感受性更好,不易发生结块,采用含酸性基团的共聚物作为表面活性剂,其酸性基团能够与磁性颗粒表面的‑OH发生反应,该表面活性剂可以使磁性颗粒更好地分散在载液中,提高磁流变液的沉降稳定性,半个月的沉降率仅为5%,还可以降低磁流变液的零场粘度,仅有0.38Pa·s,提高磁流变液对磁性颗粒的溶解能力,对有高剪切要求的场合可以通过提高磁性颗粒的体积分数来提高剪切应力同时保证良好的流动性。
Description
技术领域
本发明涉及一种高稳定性磁流变液,属于智能材料技术领域。
背景技术
磁流变液是一种可控流体智能材料,它是由微米级磁性颗粒分散在载液中所形成的固液两相悬浮液。在外加磁场作用下,磁流变液的流变特性能在毫秒级时间内发生急剧变化,由流动性良好的流体转变为粘度极大的类固体,对外表现出一定的屈服应力,撤去磁场后又重新变回自由流动的流体状态,并且这种变化是快速、可逆、可控的。正是由于这种特性,磁流变液广泛应用于汽车、机械、航空、建筑、医疗等领域。
目前,磁流变液的研究已经取得一定进展,但磁流变液还有一些难解决的问题,如沉降稳定性差、零场粘度大,严重限制了其在工程机械中的应用。专利200680024135.5以聚α烯烃合成油为基油,以多羟基硬脂酸和醇酸树脂为分散剂制备了磁流变液,改善了磁流变液的低温流动性,但其零场粘度可高达12.5Pa·s,且沉降后再分散性差。专利200610124728.0公开的以硅油为载液制备的磁流变液零场粘度大,流动性差。专利201210411108.0制备了硅油基磁流变液,其零场粘度可达到10Pa·s。
发明内容
针对现有的磁流变液存在的分散性差、零场粘度大、流动性差等问题,本发明提供了一种高稳定性磁流变液,所述的磁流变液沉降缓慢且均为软性沉淀,同时零场粘度较低。
本发明的技术方案如下:
一种高稳定性磁流变液,包括磁性颗粒、载液、表面活性剂、触变剂、抗氧化剂和抗磨剂,按重量百分比计,组成如下:
磁性颗粒75%~85%,
粘度为30~40cst的矿物油或聚α烯烃合成油15%~25%,
含酸性基团的共聚物或共聚物溶液0.3%~1%,
触变剂0.3%~1%,
抗氧化剂0.3%~1%,
抗磨剂0.3%~1%。
所述的磁性颗粒可以是羰基铁粉、钴粉、镍粉及铁钴镍的合金粉,优选为直径2~3μm的羰基铁粉。
所述的矿物油或聚α烯烃合成油作为载液。
所述的含酸性基团的共聚物或共聚物溶液为表面活性剂。
所述的触变剂为气相白炭黑和有机膨润土中的一种或两者的混合物。
所述的抗氧化剂为亚硝酸盐和苯甲酸中的一种或两者的混合物。
所述的抗磨剂为石墨和二硫化钼中的一种或两者的混合物。
本发明进一步提供上述高稳定性磁流变液的制备方法,具体步骤为:
将矿物油或聚α烯烃合成油加热后加入触变剂,搅拌混合均匀后加入含酸性基团的共聚物,搅拌分散均匀,加入抗磨剂和抗氧化剂,搅拌分散均匀,加入磁性颗粒,剪切分散均匀即得磁流变液。
与现有技术相比,本发明具有以下显著优点:
(1)本发明的制备方法步骤简单,耗费时间较短,能够得到性能优良的磁流变液,有利于促进磁流变液的工业应用;
(2)针对目前多以硅油为分散相的磁流变液沉降稳定性差且易产生硬性沉淀的缺点,本发明以矿物油或聚α烯烃合成油为载液,对许多有利添加剂的感受性更好,不易发生结块,选用的矿物油或聚α烯烃合成油在40℃的粘度为30~40cst,制备的磁流变液具有较低的零场粘度;
(3)本发明采用含酸性基团的共聚物作为表面活性剂,其酸性基团能够与磁性颗粒表面的-OH发生反应,适当的加入可以使磁性颗粒更好地分散在载液中,能够提高磁流变液的沉降稳定性,半个月的沉降率仅为5%,还可以降低磁流变液的零场粘度,仅有0.38Pa·s,提高磁流变液对磁性颗粒的溶解能力,对有高剪切要求的场合可以通过提高磁性颗粒的体积分数来提高剪切应力同时保证良好的流动性。
具体实施方式
下面结合实施例对本发明作进一步详述。
本发明实施例中的含酸性基团的共聚物溶液购自东莞市易立安化工科技有限公司,型号为EL-2410。
实施例1
一种高稳定性磁流变液,各组分的重量百分比为:
磁性颗粒84%,
聚α烯烃合成油13%,
含酸性基团的共聚物或共聚物溶液1%,
触变剂0.4%,
抗氧化剂0.6%,
抗磨剂1%。
将60g聚α烯烃合成油加热至55℃后加入2g触变剂有机膨润土,搅拌均匀;再加入5.1g含酸性基团的共聚物溶液作表面活性剂,搅拌均匀;然后再加入5g抗磨剂石墨,3g抗氧化剂亚硝酸钠,搅拌均匀;接着加入400g羰基铁粉后高速分散1h即获得磁流变液成品。该磁流变液室温下的粘度为0.808Pa·s(D=50/s),室温下静置半个月后沉降率低于5%,沉降后易于再分散。
实施例2
一种高稳定性磁流变液,各组分的重量百分比为:
磁性颗粒75%,
矿物油22%,
含酸性基团的共聚物或共聚物溶液0.5%,
触变剂0.8%,
抗氧化剂0.9%,
抗磨剂0.8%。
将62g矿物油加热至60℃后加入2.5g触变剂气相白炭黑,搅拌均匀;再加入1.5g含酸性基团的共聚物溶液作表面活性剂,搅拌均匀;然后再加入2.5g抗磨剂二硫化钼,2.5g抗氧化剂苯甲酸,搅拌均匀;接着加入210g羰基铁粉后高速分散1h即获得磁流变液成品。该磁流变液室温下的粘度为0.38Pa·s(D=50/s),室温下静置半个月后沉降率低于13%,沉降后易于再分散。
实施例3
一种高稳定性磁流变液,各组分的重量百分比为:
磁性颗粒75%,
聚α烯烃合成油22%,
含酸性基团的共聚物或共聚物溶液0.7%,
触变剂1%,
抗氧化剂0.7%,
抗磨剂0.6%。
将62g聚α烯烃合成油加热至65℃后加入3g触变剂气相白炭黑,搅拌均匀;再加入2.04g含酸性基团的共聚物溶液作表面活性剂,搅拌均匀;然后再加入2g抗磨剂石墨,2g抗氧化剂亚硝酸钠,搅拌均匀;接着加入210g羰基铁粉后高速分散1h即获得磁流变液成品。该磁流变液室温下的粘度为0.63Pa·s(D=86/s),室温下静置半个月后沉降率低于5.7%,沉降后易于再分散。
实施例4
一种高稳定性磁流变液,各组分的重量百分比为:
磁性颗粒75%,
矿物油23%,
含酸性基团的共聚物或共聚物溶液0.33%,
触变剂1%,
抗氧化剂0.33%,
抗磨剂0.34%。
将65g聚α烯烃合成油加热至55℃后加入3g触变剂气相白炭黑,搅拌均匀;再加入1g含酸性基团的共聚物溶液作表面活性剂,搅拌均匀;然后再加入1g抗磨剂石墨,1g抗氧化剂亚硝酸钠,搅拌均匀;接着加入210g羰基铁粉后高速分散1h即获得磁流变液成品。该磁流变液室温下的粘度为0.78Pa·s(D=50/s),室温下静置半个月后沉降率低于12%,沉降后易于再分散。
对比例1
将62g聚α烯烃合成油加热至55℃后加入1.04g触变剂气相白炭黑,搅拌均匀;再加入1.33g聚酰胺聚合物作表面活性剂,搅拌均匀;然后再加入1g抗磨剂石墨,1g抗氧化剂亚硝酸钠,搅拌均匀;接着加入210g羰基铁粉后高速分散1h即获得磁流变液成品。该磁流变液室温下的粘度为1.76Pa·s(D=89/s),半个月后沉降率低于15%,沉降后易于再分散。
对比例2
将30g二甲基硅油(粘度1000mP·s)加热至60℃,加入1g触变剂气相白炭黑,搅拌均匀;再加入1g含酸性基团的共聚物作表面活性剂,搅拌均匀;然后再加入1g抗磨剂石墨,1g抗氧化剂亚硝酸钠,搅拌均匀;接着加入100g羰基铁粉后搅拌2h即获得磁流变液成品。该磁流变液室温下的粘度为5.69Pa·s(D=50/s),半个月后沉降率低于14%,长期静置形成硬性沉淀。
Claims (7)
1.一种高稳定性磁流变液,包括磁性颗粒、载液、表面活性剂、触变剂、抗氧化剂和抗磨剂,其特征在于,按重量百分比计,组成如下:
磁性颗粒75%~85%,
粘度为30~40cst的矿物油或聚α烯烃合成油15%~25%,
含酸性基团的共聚物或共聚物溶液0.3%~1%,
触变剂0.3%~1%,
抗氧化剂0.3%~1%,
抗磨剂0.3%~1%。
2.根据权利要求1所述的高稳定性磁流变液,其特征在于,所述的磁性颗粒选自羰基铁粉、钴粉、镍粉或铁钴镍的合金粉。
3.根据权利要求2所述的高稳定性磁流变液,其特征在于,所述的磁性颗粒为直径2~3μm的羰基铁粉。
4.根据权利要求1所述的高稳定性磁流变液,其特征在于,所述的触变剂为气相白炭黑和有机膨润土中的一种或两者的混合物。
5.根据权利要求1所述的高稳定性磁流变液,其特征在于,所述的抗氧化剂为亚硝酸盐和苯甲酸中的一种或两者的混合物。
6.根据权利要求1所述的高稳定性磁流变液,其特征在于,所述的抗磨剂为石墨和二硫化钼中的一种或两者的混合物。
7.根据权利要求1至6任一所述的高稳定性磁流变液的制备方法,其特征在于,具体步骤为:
将矿物油或聚α烯烃合成油加热后加入触变剂,搅拌混合均匀后加入含酸性基团的共聚物,搅拌分散均匀,加入抗磨剂和抗氧化剂,搅拌分散均匀,加入磁性颗粒,剪切分散均匀即得磁流变液。
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CN114334414A (zh) * | 2021-12-14 | 2022-04-12 | 苏州传洋机电科技有限公司 | 一种软磁性复合颗粒抗沉降磁流变液制备工艺 |
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CN114334414A (zh) * | 2021-12-14 | 2022-04-12 | 苏州传洋机电科技有限公司 | 一种软磁性复合颗粒抗沉降磁流变液制备工艺 |
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