CN103033589B - Method for evaluating colloid stability of detergent - Google Patents
Method for evaluating colloid stability of detergent Download PDFInfo
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- CN103033589B CN103033589B CN201110302504.5A CN201110302504A CN103033589B CN 103033589 B CN103033589 B CN 103033589B CN 201110302504 A CN201110302504 A CN 201110302504A CN 103033589 B CN103033589 B CN 103033589B
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Abstract
The invention relates to a method for evaluating colloid stability of a detergent and mainly aims at solving the problem that the colloid stability of the detergent can not be visually evaluated by the prior art. The problem is well solved by the adoption of a technical scheme which comprises the following steps in sequence: a) stirring and uniformly mixing the detergent with a solvent at the temperature of 10-50 DEG C, thus obtaining a mixture A, wherein the solvent is selected from at least one of petroleum ether, n-heptane or n-pentane with a distillation range of 60-90 DEG C or 90-120 DEG C; and b) enabling the mixture A to stand for 24-120h, observing the quantity of precipitates and evaluating the colloid stability of the detergent according to the quantity of the precipitates. The method can be used for evaluation on the colloid stability of the detergent in industrial production.
Description
Technical field
The present invention relates to the evaluation method that a kind of detersive is colloid-stabilised.
Background technology
Detersive is one of adjuvant kind that in lubricating oil, consumption is maximum, and global Year's consumption about 900,000 tons, accounts for whole additive amount 20%.The major function of detersive is that neutral lubrication is oily because of acidic materials that high-temperature oxydation produces, and prevents the corrosion of engine metal; Colloid, greasy filth and some harmful polar materials that oil product is polymerized because of long oxidation under the high temperature conditions can be adsorbed simultaneously, suppress them to form the sedimental tendencies such as greasy filth, paint film and carbon deposit.Conventional detersive mainly contains the types such as sulfonate, alkyl monosulfide phenates, salicylate, naphthenic base salt.
Detersive is generally made up of oil solution, basic component (carbonate or metal hydroxides), polar group and non-polar group four part, hydrophilic polar group and the non-polar group of oleophylic constitute two property compound, and basic component is contained wherein, be colloid.When detersive is added in lubricating oil, the colloid in detersive exists with monomolecular dissolved state.When running into metal surface, polar group hydrophilic in detersive colloid can be adsorbed in metal surface, and that one end of the non-polar group of another oleophylic is then towards oil phase.When oil product produces acidic materials because of oxidation, a certain amount of basic component can be discharged in colloid and neutralize with it.When producing non-oil dissolubility colloid, solia particle and other polar material in oil product, the polar group in detersive can be adsorbed, and is dispersed in oil phase.
Because detersive produces peace and quiet effect mainly through colloid, therefore the stability of colloid is most important, and can it be mainly manifested in basic component and remain in colloid chronically, and the particle size of main and basic component and particle diameter shape have direct relation.At present, the method of the evaluation colloid stability of detergent of also not generally acknowledging in industry, someone adopts freeze etching technique to pass judgment on roughly the colloidal stability (research of detergent for lubricating oil colloform texture and property relationship of detersive before, petroleum refining and chemical industry, 1996,27 (3), 60 ~ 63).The cardinal principle of freeze etching technique by transmission electron microscope, the type of solid particle in colloid (amorphous or crystal formation) is carried out making a video recording into shadow with the particle diameter of solid particle, it is generally acknowledged that the basic component particle diameter in colloid is less, colloidal stability may be relatively good.Freeze etching needs to adopt the equipment such as freezing cutter, high vacuum spraying plating instrument, temperature adding controller and transmission electron microscope usually.The concrete practice be by detersive after liquid nitrogen frozen, part chip solid sample is cut by freezing cutter, pass through in organic solvent " rinsing ", wash away the oil solution in detersive, the solid " bone " obtained is heated through high vacuum spraying plating instrument spraying plating and temperature adding controller, the granularity finally under transmission electron microscope in observing colloid and uniformity coefficient shaping of taking a picture.This method generally can obtain definite picture information reliably, but, if colloidal particle size size distribution is wider, so small particle to be easy to cover by bulky grain, can localized distortion be caused.In addition, the analytical cycle of freeze etching is longer, and general needs 2 days, analysis cost also costly.
Summary of the invention
Technical matters to be solved by this invention is that prior art exists can not the problem of visual evaluation colloid stability of detergent, provides a kind of evaluation method of new colloid stability of detergent.The method energy visual evaluation detersive colloidal stability, method is simple, low cost.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of evaluation method of colloid stability of detergent, comprises the following steps successively:
A) detersive and solvent are stirred under temperature 10 ~ 50 DEG C of conditions, mix, obtain potpourri A; Selected solvent is selected from least one in sherwood oil, normal heptane or the n-pentane that boiling range is 60 ~ 90 DEG C or 90 ~ 120 DEG C;
B) potpourri A is left standstill 24 ~ 120 hours, observe precipitation quantity, evaluate detersive colloidal stability with this.
In technique scheme, step a) in the volume ratio of detersive and solvent be (1: 9) ~ (1: 1), preferable range is (1: 9) ~ (2: 8).Step a) middle preferable range temperature is 20 ~ 40 DEG C.Step a) mixing time is 5 ~ 30 minutes, and preferable range is 10 ~ 30 minutes.Described solvent preferred version is that to be selected from boiling range be at least one in the sherwood oil of 60 ~ 90 DEG C or normal heptane.Step b) in the time of repose preferable range of potpourri A be 48 ~ 72 hours.
The precipitation quantity of potpourri after standing a period of time that the present invention is formed by observation detersive and solvent, evaluate colloid stability of detergent, method is simple, low cost, and and the actual performance of detersive evaluate between there is good correlativity, achieve good technique effect.
Below by embodiment, the present invention is further elaborated.
Embodiment
[embodiment 1 ~ 6]
Under the state that mixing temperature, type of solvent are identical with standing number of days, change the volume ratio of detersive and solvent, evaluate the colloid-stabilised sex differernce of 2 sulfonate of the same type.
Table 1
*: the volume ratio of detersive and solvent.
As can be seen from Table 1, in the sulfonate of same type, along with the reduction of the volume ratio of detersive and solvent, its precipitation capacity also reduces thereupon.Illustrate that the inventive method has distinction for the detersive with different colloidal stability.
[embodiment 7 ~ 11]
To identical product T106B-2, when volume ratio (5: 5) of same mixture temperature (30 DEG C), same solvent (sherwood oil 60 ~ 90 DEG C), same detersive and solvent, investigate the situation of change of precipitation capacity under different time of repose.
Table 2
As can be seen from Table 2, along with the prolongation of time of repose, the quantity of its precipitation also increases thereupon, but after 72 hours, precipitation capacity increasing degree is less.
[embodiment 12 ~ 20]
Laboratory adopts usually, and " crankcase simulation test method (QZX method) SH/T 0300-1992 " evaluates the detergency of detersive.The method mainly forms paint film by being splashed to high-temperature metal surface containing the I. C. engine oil of detersive, simulates the lacquering situation of I. C. engine oil when pistons work, resit an exam examine the detergency of oil product by the glue measured on sheet metal with this.On the other hand, detersive belongs to the host in I. C. engine oil, add dosage higher, directly can affect the storage stability of oil product, the precipitation capacity that laboratory is generally formed afterwards by oil product at high temperature being deposited certain hour (as 105 DEG C, 7 days) measures, and evaluates the compatibility of detersive and base oil with this.In table 3, detersives different for several colloidal stability is modulated in diesel engine oil CD15W-40 and middling speed machine oil 4030, measures its detergency and storage stability respectively.
The test condition that [embodiment 12 ~ 15] evaluates colloidal stability is: blending temperature 50 C, solvent is normal heptane, and the volume ratio of detersive and solvent is 1: 9, and time of repose is 2 days.
The test condition that [embodiment 16 ~ 20] evaluates colloidal stability is: blending temperature 40 DEG C, solvent is n-pentane, and the volume ratio of detersive and solvent is 2: 8, and time of repose is 2 days.
Table 3
Can see from table 3, the detersive of the different colloidal stabilities adopting evaluation method of the present invention to distinguish, in detergency and storage stability test, there is good distinction equally, namely the detersive that colloidal stability is good, in detergency and storage stability test, also there is good performance, illustrate that the actual performance of evaluation method of the present invention and detersive has good correlativity between evaluating.
Claims (6)
1. an evaluation method for colloid stability of detergent, comprises the following steps successively:
A) detersive and solvent are stirred under temperature 10 ~ 50 DEG C of conditions, mix, obtain potpourri A; Selected solvent is selected from least one in sherwood oil, normal heptane or the n-pentane that boiling range is 60 ~ 90 DEG C or 90 ~ 120 DEG C;
B) potpourri A is left standstill 24 ~ 120 hours, observe precipitation quantity, evaluate detersive colloidal stability with this;
Step a) in the volume ratio of detersive and solvent be (1:9) ~ (1:1); Step a) mixing time is 5 ~ 30 minutes.
2. the evaluation method of colloid stability of detergent according to claim 1, is characterized in that during step a), detersive is (1:9) ~ (2:8) with the volume ratio of solvent.
3. the evaluation method of colloid stability of detergent according to claim 1, is characterized in that temperature is 20 ~ 40 DEG C during step a).
4. the evaluation method of colloid stability of detergent according to claim 1, it is characterized in that step a) mixing time be 10 ~ 30 minutes.
5. the evaluation method of colloid stability of detergent according to claim 1, it is characterized in that described solvent is selected from boiling range is at least one in the sherwood oil of 60 ~ 90 DEG C or normal heptane.
6. the evaluation method of colloid stability of detergent according to claim 1, is characterized in that step b) in the time of repose of potpourri A be 48 ~ 72 hours.
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| CN201110302504.5A CN103033589B (en) | 2011-10-09 | 2011-10-09 | Method for evaluating colloid stability of detergent |
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| CN201110302504.5A CN103033589B (en) | 2011-10-09 | 2011-10-09 | Method for evaluating colloid stability of detergent |
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| CN103033589B true CN103033589B (en) | 2015-04-15 |
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| CN105043931B (en) * | 2015-07-13 | 2018-08-24 | 中国石油集团渤海钻探工程有限公司 | A kind of sedimentation stability measurement method of well cementation prepad fluid or after pad |
| CN108267375A (en) * | 2016-12-30 | 2018-07-10 | 中国石油天然气股份有限公司 | Detergent micelle stability testing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1871086A (en) * | 2003-07-17 | 2006-11-29 | 旭化成医疗株式会社 | Metal colloid solution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871086A (en) * | 2003-07-17 | 2006-11-29 | 旭化成医疗株式会社 | Metal colloid solution |
Non-Patent Citations (4)
| Title |
|---|
| 烷基水杨酸盐的胶体结构与其稳定性关系研究;姚文钊 等;《润滑油》;20010430;第16卷(第2期);第55-59页 * |
| 烷基水杨酸盐系列产品胶体稳定性研究;付兴国 等;《润滑油科技情报站论文专辑》;20001031;第311-314页 * |
| 纳米磺酸钙镁复合清净剂的合成、性能与机理研究;梁生荣;《中国博士学位论文数据库——工程科技Ⅰ辑》;20110815;第51页倒数第1段以及第52页第1段 * |
| 邵伟.第四节 胶体的稳定性.《物理化学》.人民卫生出版社,2000,(第2版), * |
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