CN1081229C - Ashless dispersant for boron-containing post-crosslinked butanediimide and its preparation - Google Patents
Ashless dispersant for boron-containing post-crosslinked butanediimide and its preparation Download PDFInfo
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- CN1081229C CN1081229C CN98125668A CN98125668A CN1081229C CN 1081229 C CN1081229 C CN 1081229C CN 98125668 A CN98125668 A CN 98125668A CN 98125668 A CN98125668 A CN 98125668A CN 1081229 C CN1081229 C CN 1081229C
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Abstract
The present invention relates to a rear cross linking polyisobutylene group succinimide ashless dispersant containing boron, which is characterized in that (1) the number-average molar mass of polyisobutylene group is from 500 to 5000; (2) the replacement degree of carboxybutyryl group on each polyisobutylene group is from 1.3 to 2.5; (3) the mol ratio of carbonyls number to polyene polyamine group is 2 to 10:1; (4) the boron content is from 0.01 to 1.0 wt%. The dispersant is obtained by that a rear cross linking succinimide dispersant and a boronising agent whose particle diameter is less than 150 micrometers react at the temperature which is lower than the boiling point of an accelerant when the fatty alcohol accelerant whose boiling point is more r than 100DEG C exists. The dispersant has good low-temperature dispersing performance and obvious thermal oxygenation stability performance, and in addition, the dispersant does not generate boron slag in a preparation process.
Description
The present invention relates to a kind of succimide type lubricant ashless dispersant and preparation thereof, exactly is a kind of boron-containing post-crosslinked polyisobutenyl Ashless butyl diimide dispersant and preparation thereof.
The succimide dispersion agent is one of at present most widely used lubricating oil dispersant.The different succimide dispersing agent performance of structure is difference to some extent also, for example, mono butonediimide nitrogen content height, low temperature dispersity is good, but thermostability is relatively poor, and many succimides Heat stability is good, but nitrogen content is low, and low temperature dispersity is undesirable.In order to solve this contradiction, CN95107994.8 discloses the crosslinked Ashless butyl diimide dispersant in a kind of back.This dispersion agent has following feature: the substitution value of Succinic Acid (acid anhydride) is 1.3～2.0 on (1) polyisobutene molecule, and the carbonyl number of (2) final product and the mol ratio of polyamines polyene are 4～1: 1.The preparation method that this is ashless dose is the alkyl acylating agent and the polyamines polyene reaction that will have identical or different molecular weight; make hydrocarbyl amide and imido mixture; react with the afterreaction reagent diprotic acid (acid anhydride) with crosslinked action, diprotic acid (acid anhydride) is taked substep adding mode again.This ashless dispersant has higher nitrogen content and good low temperature dispersity energy, and the heat decomposition temperature height, and thermo-oxidative stability makes moderate progress.
Further discover,, make boron-containing dispersant, can further improve its thermo-oxidative stability succimide dispersion agent and boronating agent such as reactions such as boric acid, boric acid ester.But be easy to produce the boron slag in the boronation process, cause difficulty for aftertreatment and practical application, the document from report does not also fundamentally address this problem both at home and abroad.
EP0460309A1 discloses and a kind ofly will carry out the method for boronation through crosslinked ashless dispersant later: the first step, and react at 160～170 ℃ with polyisobutenyl succinic anhydride and tetraethylene pentamine earlier and made ashless dispersant in 4 hours; Second step added maleic anhydride 165～170 ℃ of reactions 1.5 hours, made the crosslinked ashless dispersant in back; The 3rd step added boric acid 150～155 ℃ of reactions 1 hour, and vacuum hydro-extraction promptly gets product.This patent does not illustrate whether products obtained therefrom does not have slag.
Chinese patent CN1090877A discloses a kind of improved low sedimentation method that forms the boronation dispersion agent, be to be the value with the size distribution characterizing definition of boric acid particle in lubricating oil, the boric acid particle of value＜450 is contacted with the succinimide dispersants that polyalkenyl replaces, can obtain containing the borated dispersants of the following sediment of 0.03vol%.Wherein the value is to determine like this: at first measure the size distribution of boric acid particle in oil, be divided into some distribution sections by particle diameter then, total sphere volume of each section that distributes is the value with the ratio of total sphere area.The method complexity of this control particle diameter is loaded down with trivial details again.
The object of the present invention is to provide a kind of Ashless dispersant for boron-containing post-crosslinked butanediimide of the thermo-oxidative stability energy that has good low temperature dispersity energy and give prominence to.
Another object of the present invention is to overcome the above-mentioned defective of prior art, and a kind of preparation method boron slag, above-mentioned boron-containing post-crosslinked polyisobutenyl Ashless butyl diimide dispersant that do not produce is provided.
Ashless dispersant provided by the invention has following feature:
(1) number-average molecular weight of polyisobutenyl is 500～5000;
(2) substitution value of succinyl is 1.3～2.5 on each polyisobutenyl;
(3) mol ratio of carbonyl number and polyamines polyene base is 2～10: 1;
(4) boron content is 0.01～1.0 heavy %, is benchmark with the dispersion agent gross weight.
Specifically, ashless dispersant provided by the invention has following feature:
The number average molecule of polyisobutenyl can be 500～5000, and is preferred 800～3000, more preferably 1000～2500, and can comprise polyisobutenyl in the product with a kind of molecular weight, also can comprise the polyisobutenyl of different molecular weight.
The mean number of succinyl is that substitution value can be 1.3～2.5 on each polyisobutenyl, preferred 1.4～2.0, preferred 1.5～1.8.The substitution value height, nitrogen content height then, the low temperature dispersity of product is good.
The carbonyl number in the product and the mol ratio of polyamines polyene base can be 2～10: 1, preferred 3～8: 1, more preferably 4～7: 1.Carbonyl content height then product thermo-oxidative stability is good.Described polyamines polyene base can be diethylenetriamine base, triethylene tetramine base, tetraethylene pentamine base, five ethene hexamine bases, six ethene, seven amidos, seven ethene, eight amidos, it also can be any mixture of two or more arbitrary proportion among them, one of preferred diethylenetriamine base, triethylene tetramine base, tetraethylene pentamine base, five ethene hexamine bases or its mixture, more preferably triethylene tetramine base or tetraethylene pentamine base.
Boron content is benchmark with the dispersion agent gross weight in the product, can be 0.01～1.0 heavy %, preferred 0.05～0.8 heavy %, more preferably 0.1～0.6 heavy %.
The preparation of Ashless dispersant for boron-containing post-crosslinked butanediimide provided by the invention comprises:
With the post-crosslinked butanediimide ashless dispersant, particle diameter is less than 150 microns the boronating agent that is selected from boric acid or metaboric acid, and boiling point is higher than 100 ℃ Fatty Alcohol(C12-C14 and C12-C18) promotor and mixes, and reacts the Separation and Recovery product under the temperature that is lower than the promotor boiling point 1～5 hour.
Specifically, dispersion agent provided by the invention can prepare as follows:
With post-crosslinked butanediimide dispersion agent and particle diameter less than 150 microns, being preferably less than the Fatty Alcohol(C12-C14 and C12-C18) promotor that 120 microns boronating agent and boiling point be higher than 100 ℃ mixes, under the temperature that is lower than the promotor boiling point, preferred 50～100 ℃ were reacted 1～5 hour down, be warming up to the promotor boiling point then or more than the boiling point, slough promotor and water, reclaim product.
Described boronating agent can be one of boric acid, metaboric acid or boric acid ester or its mixture, preferred boric acid or metaboric acid.The add-on of boronating agent should make the boron content of final product reach 0.01～1.0 heavy %, preferred 0.05～0.8 heavy %, more preferably 0.1～0.6 heavy %.
Described promotor is that boiling point is higher than 100 ℃ Fatty Alcohol(C12-C14 and C12-C18), as propyl carbinol, isopropylcarbinol, Pentyl alcohol, primary isoamyl alcohol, n-hexyl alcohol, also can be any mixture of two or more arbitrary proportion wherein, preferred propyl carbinol and Pentyl alcohol, most preferably propyl carbinol.The add-on of promotor can be 0.2～2 times of boronating agent weight, preferred 0.4～1.8 times, and more preferably 0.6～1.5 times.
Described temperature of reaction should be lower than the boiling point of promotor, for example, can be 50～100 ℃, and the reaction times can be 1～5 hour.In order to reach optimal conversion, the reaction times should be determined according to temperature of reaction.
Described post-crosslinked butanediimide ashless dispersant can be bought from market, also can make by oneself as follows (can with reference to CN95107994.8):
With substitution value is 1.3～2.5, preferred 1.4～2.0, more preferably 1.5～1.8 polyisobutenyl succimide and afterreaction reagent mix; in the presence of nitrogen protection and reaction medium; at 100～250 ℃, preferred 100～200 ℃, more preferably 130～200 ℃ of following reactions got final product in 4～8 hours.
Described polyisobutenyl succimide is to be that 500～5000 polyisobutenyl succinic anhydride and polyamines polyene react according to a conventional method and make with number-average molecular weight.Wherein the number-average molecular weight of polyisobutenyl succinic anhydride can be 500～5000, and the number-average molecular weight of polyisobutenyl succinic anhydride can be a kind of, also can be two or more.If the latter, the polyisobutenyl succinic anhydride of different molecular weight must be reacted with polyamines polyene respectively.The structure that is suitable for polyamines polyene of the present invention is H
2N (CH
2)
n[NH (CH
2)
n]
mNH
2, wherein n is 2 or 3, m is 0～6 integer.For example, described polyamines polyene can be quadrol, propylene diamine, diethylenetriamine, triethylene tetramine, tetraethylene pentamine, five ethene hexamines, six ethene, seven amine, seven ethene, eight amine, it also can be any mixture of component arbitrary proportion wherein, one of preferred diethylenetriamine, triethylene tetramine, tetraethylene pentamine, five ethene hexamines or its mixture, more preferably triethylene tetramine or tetraethylene pentamine.
Described afterreaction reagent is diprotic acid (acid anhydride), for example, can be Succinic Acid (acid anhydride), toxilic acid (acid anhydride) or polyisobutenyl Succinic Acid (acid anhydride), the number-average molecular weight of polyisobutene can be 500～1000, the mode that afterreaction reagent adopts substep to add, add-on is controlled at that the mol ratio of carbonyl number and polyamines polyene is 2～10: 1 in the final product, and is preferred 3～8, and more preferably 4～7: 1.
Described reaction medium is selected from a kind of in toluene, dimethylbenzene or the mineral oil.
Ashless dispersant for boron-containing post-crosslinked butanediimide provided by the invention is owing to the mol ratio of substitution value, carbonyl number and the polyamines polyene base of having controlled succinyl and suitable boron content; make product not only keep the good low temperature dispersity energy of boronation front and back crosslinked butanediimide ashless dispersants; but also further improved thermo-oxidative stability, for example its heat decomposition temperature is corresponding before than boronation has improved 10～30 ℃.
The preparation method of above-mentioned dispersion agent provided by the invention is owing to selected suitable promotor for use, and only need are controlled the particle diameter of boronating agent and without the control ratio surface-area, can be made and not produce the boron slag in the boronation process, have saved the energy, have also reduced postprocessing working procedures.
The invention will be further described below by example.
The analytical procedure of every index and method of calculation are described as follows in the example of the present invention:
1. saponification value analytical procedure: GB264.
2. analysis of nitrogen content method: SH/T 0224.
3. molecular weight analyse method: SH/T 0108-92.Wherein Mn is a number-average molecular weight, and Mw is a weight-average molecular weight, and Mw/Mn is a molecular weight distribution.
4. lubricating oil additive initial decomposition temperature: test (DSC method) with difference formula scanning calorimeter.6. substitution value
Example 1
This example is the preparation of the crosslinked polyisobutenyl succimide in back.
In there-necked flask; add 70 gram polyisobutenyl succinic anhydride (Mn=2300; Mw/Mn=2.8; saponification value=61 milligram KOH/ gram; X=1.3) and 70 the gram 150 SN base oils, under agitation be heated to 130 ℃, add then 2.7 the gram triethylene tetramines under nitrogen protection, be warming up to 170 ℃ the reaction 5 hours; get intermediates A1, the carbonyl number of these intermediates and the mol ratio of triethylene tetramine base are 5.3: 1.
Get 110 gram A2 and 0.7 gram maleic anhydride reacts in 150 ℃ under nitrogen protection, maleic anhydride divides and adds for three times, and coreaction 6 hours makes product P A of the present invention
1, the carbonyl number of this product and the mol ratio of triethylene tetramine base are 6.8: 1, its physicochemical property sees Table 1.Example 2
This example is the preparation of the crosslinked polyisobutenyl succimide in back.
In there-necked flask; with 60 gram polyisobutenyl succinic anhydride (Mn=1000; saponification value=139.5 milligram KOH/ gram; X=1.4) and 60 grams, 150 SN base oils mix to stir; be heated to 140 ℃; add 7.0 gram tetraethylene pentamine subsequently, under nitrogen protection, be warming up to 170 ℃ of reactions 5 hours, make intermediates A
2, the mol ratio of its carbonyl number and tetraethylene pentamine base is 4: 1.
In there-necked flask; add 6300 gram polyisobutenyl succinic anhydride (Mn=2000; Mw/Mn=2.0; saponification value=101 milligram KOH/ gram X=2.0) with 6300 grams, 150 SN base oils, under agitation mixes; and be heated to 150 ℃; add 589.4 gram tetraethylene pentamine subsequently, under nitrogen protection, be warming up to 170 ℃ of reactions 5 hours, get intermediates A
2', the mol ratio of its carbonyl number and tetraethylene pentamine base is 3.6: 1.
With intermediates A
2, A
2' respectively get 50 the gram mix; and be heated to 150 ℃, and under nitrogen protection, in 3 hours, divide then to add three kinds of afterreaction reagent three times, add maleic anhydride 0.6 gram for the first time; (Jinzhou Petrochemical Co. produces to add for the second time 6.6 gram polyisobutylene butanedioic anhydrides; Mn=1000, X=1), add the many Succinic anhydrieds of 5.6 gram polyisobutene (Mn=1000, saponification value=147 milligram KOH/ gram for the third time; X=1.5); react on 150 ℃ and carry out, coreaction 6 hours makes product P A of the present invention
2., the carbonyl number of this product and the mol ratio of tetraethylene pentamine base are 5.3: 1, its physicochemical property sees Table 1.
Example 3～6 is the preparation of boron-containing post-crosslinked polyisobutenyl Ashless butyl diimide dispersant.Example 3
In the reactor that has mechanical stirring and temperature thermocouple, add the PA of 2.2 kilograms of examples, 1 preparation
1, feed nitrogen, be warming up to 80～85 ℃, add 400 gram propyl carbinols, and 360 gram boric acid of particle diameter＜100 micron, to react after 4 hours, underpressure distillation 2.5 hours removes small-molecule substance, makes product P B
1Product is not found unreacted boric acid value after filtering, and its physicochemical property sees Table 1.Example 4
The PA that in the there-necked flask that has mechanical stirring and temperature thermocouple, adds example 1 preparation of 140 grams
1, feed nitrogen, be warming up to 85～90 ℃, add 1.5 gram propyl carbinols, then add 2.4 gram boric acid of particle diameter＜120 micron, react after 1.5 hours, be warming up to 130 ℃, gas is carried 4 hours, makes product P B
2Product is not found unreacted boric acid slag after filtering, and its physicochemical property sees Table 1.Example 5
The PA that in having the 250ml there-necked flask of mechanical stirring and temperature thermocouple, adds above-mentioned example 2 preparations of 141 grams
2, feed nitrogen, be warming up to 90～95 ℃, add 1.4 gram Pentyl alcohols, then add 2.4 gram metaboric acids of particle diameter＜100 micron, react after 1.5 hours, be warming up to 150 ℃, gas is carried 4 hours, makes product P B
3Product is not found unreacted boric acid slag after filtering, and the product physicochemical property sees Table 1.Example 6
In having the 250ml there-necked flask of mechanical stirring and temperature thermocouple, add the PA of above-mentioned example 1 preparation of 141 grams
1, feed nitrogen, be warming up to 85～90 ℃, add 1.4 gram Pentyl alcohols, then add 5.0 gram metaboric acids of particle diameter＜100 micron, react after 1.5 hours, be warming up to 150 ℃, gas is carried 4 hours, makes product P B
4Product is not found unreacted boric acid slag after filtering, and the product physicochemical property sees Table 1.Comparative Examples 1
This example explanation promotor role in method provided by the invention.
With reference to the method for CN1090877A, in having the 250ml there-necked flask of mechanical stirring and temperature thermocouple, add the PA of above-mentioned example 1 preparation of 140 grams
1, add 2.4 gram boric acid of particle diameter＜100 micron, react after 1.5 hours, be warming up to 140 ℃, gas is carried 4 hours, must PB
5Product filters the back and finds unreacted boric acid slag, and the quantity of slag is 1.4 grams.The product physicochemical property sees Table 1.Comparative Examples 2
This Comparative Examples explanation control particle diameter is less than 150 microns necessity.
With reference to the method for example 4, in having the 250ml there-necked flask of mechanical stirring and temperature thermocouple, add the PA of above-mentioned example 1 preparation of 140 grams
2, feed nitrogen, be warming up to 85～90 ℃, add 1.5 gram propyl carbinols, then add particle diameter and be 150～350 microns 2.4 gram boric acid, react after 1.5 hours, be warming up to 130 ℃, gas is carried 4 hours, makes product P B
6After filtering, product gets filter residue 0.1g.The product physicochemical property sees Table 1.
As shown in Table 1, boron-containing post-crosslinked succinic diamide ashless dispersant provided by the invention has outstanding thermo-oxidative stability energy.Table 1
| Product | Numbering | Initial decomposition temperature, ℃ | Boron content, heavy % | Filter residue, gram |
| Example 1 | PA 1 | 290 | 0 | 0 |
| Example 2 | PA 2 | 290 | 0 | 0 |
| Example 3 | PB 1 | 306 | 0.3 | 0 |
| Example 4 | PB 2 | 312 | 0.2 | 0 |
| Example 5 | PB 3 | 321 | 0.3 | 0 |
| Example 6 | PB 4 | 305 | 0.6 | 0 |
| Comparative Examples 1 | PB 5 | 298 | 0.1 | 1.4 |
| Comparative Examples 2 | PB 6 | 322 | 0.2 | 0.1 |
Claims (10)
1. boron-containing post-crosslinked polyisobutenyl Ashless butyl diimide dispersant is characterized in that:
(1) number-average molecular weight of polyisobutenyl is 500～5000;
(2) substitution value of succinyl is 1.3～2.5 on each polyisobutenyl;
(3) mol ratio of carbonyl number and polyamines polyene base is 2～10: 1;
(4) boron content is 0.01～1.0 heavy %, is benchmark with the dispersion agent gross weight.
2. according to the described dispersion agent of claim 1; the number-average molecular weight that it is characterized in that polyisobutenyl is 800～3000; the substitution value of succinyl is 1.4～2.0 on each polyisobutenyl, and the mol ratio of carbonyl number and polyamines polyene base is 3～8: 1, and boron content is 0.05～0.8 heavy %.
3. according to claim 1 or 2 described dispersion agents, it is characterized in that described polyamines polyene base is selected from diethylenetriamine base, triethylene tetramine base, tetraethylene pentamine base or five ethene hexamine bases.
4. the preparation method of the described boron-containing post-crosslinked polyisobutenyl Ashless butyl diimide dispersant of claim 1; comprise: the succimide dispersion agent that the back is crosslinked; grain is through the boronating agent that is selected from boric acid or metaboric acid less than 150 microns; and boiling point is higher than 100 ℃ Fatty Alcohol(C12-C14 and C12-C18) promotor mixing; under the temperature that is lower than the promotor boiling point, reacted 1～5 hour; the Separation and Recovery product; wherein the consumption of boronating agent is to make the boron content of final product reach 0.01～1.0 heavy %; accelerator level is 0.2～2 times of boronating agent weight; in the back crosslinked succimide dispersion agent; the number-average molecular weight of polyisobutenyl is 500～5000; the substitution value of succinyl is 1.3～2.5 on the polyisobutenyl, and the mol ratio of carbonyl number and polyamines polyene base is 2～10: 1.
5. according to the described method of claim 4; it is characterized in that in the crosslinked polyisobutenyl succimide dispersion agent in described back; the number-average molecular weight of polyisobutenyl is 800～3000; the substitution value of succinyl is 1.4～2.0 on the polyisobutenyl, and the mol ratio of carbonyl number and polyamines polyene base is 3～8: 1.
6. according to claim 4 or 5 described preparation methods; it is characterized in that in the crosslinked polyisobutenyl succimide dispersion agent in described back; the number-average molecular weight of polyisobutenyl is 1000～2500; the substitution value of succinyl is 1.5～1.8 on the polyisobutenyl, and the mol ratio of carbonyl number and polyamines polyene base is 4～7: 1.
7. according to the described method of claim 4, the particle diameter that it is characterized in that boronating agent is less than 150 microns.
8. according to the described method of claim 4, the consumption that it is characterized in that boronating agent is to make the boron content of final product reach 0.05～0.8 heavy %.
9. according to the described method of claim 4, it is characterized in that described promotor is selected from one of propyl carbinol, Pentyl alcohol, isopropylcarbinol, primary isoamyl alcohol, positive ethanol or its mixture.
10. according to the described method of claim 4, it is characterized in that described accelerator level is 0.4～1.8 times of boronating agent weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98125668A CN1081229C (en) | 1998-12-25 | 1998-12-25 | Ashless dispersant for boron-containing post-crosslinked butanediimide and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98125668A CN1081229C (en) | 1998-12-25 | 1998-12-25 | Ashless dispersant for boron-containing post-crosslinked butanediimide and its preparation |
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|---|---|
| CN1258728A CN1258728A (en) | 2000-07-05 |
| CN1081229C true CN1081229C (en) | 2002-03-20 |
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| CN98125668A Expired - Lifetime CN1081229C (en) | 1998-12-25 | 1998-12-25 | Ashless dispersant for boron-containing post-crosslinked butanediimide and its preparation |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747982B (en) * | 2008-12-18 | 2013-03-06 | 中国石油化工股份有限公司 | Phosphorous boronizing ashless dispersant and transmission fluid |
| CN103709331B (en) * | 2013-12-25 | 2016-01-20 | 济南开发区星火科学技术研究院 | The preparation method of boronation lubricating oil dispersant |
| CN105985470B (en) * | 2015-02-27 | 2018-05-04 | 中国石油天然气股份有限公司 | Preparation method of boronized ashless dispersant |
| CN105441168A (en) * | 2015-11-30 | 2016-03-30 | 蚌埠市华科机电有限责任公司 | Friction improved lubricating oil |
| CN113402638B (en) * | 2020-03-16 | 2022-09-27 | 中国石油化工股份有限公司 | Boron modified ashless dispersant, preparation method and application thereof |
| CN111690081A (en) * | 2020-06-23 | 2020-09-22 | 新乡市瑞丰新材料股份有限公司 | Preparation method of boronized high-molecular-weight ashless dispersant |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0460309A1 (en) * | 1990-06-06 | 1991-12-11 | Ethyl Petroleum Additives Limited | Modified dispersant compositions |
| CN1090877A (en) * | 1992-12-17 | 1994-08-17 | 埃克森化学专利公司 | Form the improved low sedimentation method of borated dispersants |
| CN1126752A (en) * | 1995-08-28 | 1996-07-17 | 中国石油化工总公司 | Ashless butyl diimide dispersant and its prepn process |
| CN1148397A (en) * | 1994-04-06 | 1997-04-23 | 埃克森化学专利公司 | Ethylene' alpha'-olefin block copolymers and method for producing same |
-
1998
- 1998-12-25 CN CN98125668A patent/CN1081229C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0460309A1 (en) * | 1990-06-06 | 1991-12-11 | Ethyl Petroleum Additives Limited | Modified dispersant compositions |
| CN1090877A (en) * | 1992-12-17 | 1994-08-17 | 埃克森化学专利公司 | Form the improved low sedimentation method of borated dispersants |
| CN1148397A (en) * | 1994-04-06 | 1997-04-23 | 埃克森化学专利公司 | Ethylene' alpha'-olefin block copolymers and method for producing same |
| CN1126752A (en) * | 1995-08-28 | 1996-07-17 | 中国石油化工总公司 | Ashless butyl diimide dispersant and its prepn process |
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|---|---|
| CN1258728A (en) | 2000-07-05 |
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