CN1155604C - Boron-aluminium-oxygen alkane, its preparation method and application - Google Patents
Boron-aluminium-oxygen alkane, its preparation method and application Download PDFInfo
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- CN1155604C CN1155604C CNB011244364A CN01124436A CN1155604C CN 1155604 C CN1155604 C CN 1155604C CN B011244364 A CNB011244364 A CN B011244364A CN 01124436 A CN01124436 A CN 01124436A CN 1155604 C CN1155604 C CN 1155604C
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Abstract
The present invention discloses boron aluminum alkoxide, a preparation method and application thereof. In the present invention, boron aluminum alkoxide has the structural formula of [Al(R1)-O]m-[Al(R2)-O]n-[B(R3)-O]p; R1 and R2 are alkyl; R3 is alkyl or aryl; the ratio of m to n is 19 to 0.05; the ratio of the sum of m and n to p is 100 to 5. In the method, mixed aluminum alkyl (aluminium ethyl and isobutyl aluminum) reacts with alkylboronic acid and reacts with water for preparing boron aluminum alkoxide. The boron aluminum alkoxide is used with post-transition metal catalysts (such as catalysts of nickel, iron, etc.) and has high olefinic polymerization activity; because the price of aluminium ethyl and isobutyl aluminum is lower than that of aluminum methyl and hydrolysis reaction is stable and can be easily controlled, the preparation method has practical value.
Description
Technical field
The present invention relates to organoaluminum and compound thereof, relate in particular to a kind of boron-aluminium-oxygen alkane and its production and use.
Background technology
Late transition metal catalyst has special performances to olefinic polymerization.The promotor that this catalyst system uses is aikyiaiurnirsoxan beta, and it is the product of aluminum alkyls partial hydrolysis, and its structure can be expressed as-[Al (R)-O]
n-, n=5-20 wherein, R is aliphatics or aromatic hydrocarbyls such as methyl, ethyl, isobutyl-.Its catalytic capability that helps substantially exceeds corresponding aluminum alkyls.Help catalytic performance and its structure of aikyiaiurnirsoxan beta are formed, and as the R/Al ratio, the kind of polymerization degree n and alkyl has substantial connection.Aikyiaiurnirsoxan beta is by aluminum alkyls and water prepared in reaction.Because the reaction of aluminum alkyls and water is very fierce thermopositive reaction, so the preparation of aikyiaiurnirsoxan beta needs SC.The synthetic method of aikyiaiurnirsoxan beta mainly contains following several method at present.A kind of method be earlier with water-dispersion in the inert medium, in saturated alkane, again aluminum alkyls and the small water droplet of dispersive are reacted.Even the use aforesaid method, the control reaction of also being careful prevents the generation of fire and blast.The another kind of method for preparing aikyiaiurnirsoxan beta be by aluminum alkyls in inert media with the hydrate reaction of inorganic salt.The advantage of these class methods is that reaction relaxes, and is easy to control.Its shortcoming is to need separation to remove inorganic salt just can obtain aikyiaiurnirsoxan beta.
The actual at present aikyiaiurnirsoxan beta of using mainly is by methylaluminoxane (MAO) and the modifier thereof of trimethyl aluminium as the initiator preparation.Owing to dangerous big, the not high reason of productive rate of price height, the building-up process of trimethyl aluminium, the price of methylaluminoxane is also higher.And other aikyiaiurnirsoxan beta, as the ethyl aikyiaiurnirsoxan beta, isobutyl aluminium alkoxide etc. help catalytic activity lower, do not have the value of practical application.We have carried out from common aluminum alkyls under state key fundamental research specific project expenditure is subsidized, as triethyl aluminum, and the high aikyiaiurnirsoxan beta that helps catalytic activity of triisobutyl aluminium preparation.
Summary of the invention
It is low to the invention provides a kind of cost, the preparation method of the boron-aluminium-oxygen alkane of easy control of reaction system and purposes.
Boron-aluminium-oxygen alkane is obtained by organo-aluminium compound and alkylboronic acids and water reaction, and its structural formula is [Al (R1)-O]
m-[Al (R2)-O]
n-[B (R3)-O]
p, R1 wherein, R2 is an alkyl, and R3 is alkyl or aromatic base, and the m/n ratio is 19～0.05, (m+n)/the p ratio is 100～3.Said R1 is an ethyl, and R2 is an isobutyl-, and R3 is a butyl, phenyl or 4-fluoro phenyl, and the m/n ratio is 2～0.5, (m+n)/the p ratio is 20～10;
The preparation method of boron-aluminium-oxygen alkane is under argon gas atmosphere, under-30 ℃～0 ℃, earlier with alkylboronic acids (R3B (OH)
2) with mol ratio be the toluene mixing solutions reaction of 0.05: 0.95 to 0.95: 0.05 triethyl aluminum and triisobutyl aluminium, wherein the molar ratio of B/Al is 1: 100～30: 100; Slowly add distilled water again at-78 ℃～-30 ℃, the molar ratio of water and aluminum alkyls is 0.6: 1 to 0.95: 1; After water added, reaction system slowly returned to room temperature, and the toluene solution of this boron-aluminium-oxygen alkane gets final product after at room temperature placing 1 to 48 hour.The mol ratio of said triethyl aluminum and triisobutyl aluminium is 0.6: 0.4～0.8: 0.2, and the mol ratio of boron and aluminium is 5: 100～10: 100, and the mol ratio of water and aluminium is 0.8～0.9.
The purposes of boron-aluminium-oxygen alkane is the promotor of late transition metal catalyst, energy catalysis alpha-olefine polymerizing, preparation high molecular weight polymers.Late transition metal catalyst is iron, cobalt, nickel organometallic compound.
Advantage of the present invention is:
1) adopts the triethyl aluminum of cheap, easy handling and triisobutyl aluminium as its raw material that begins, can reduce the cost of aikyiaiurnirsoxan beta effectively.
2) adopt a spot of alkylboronic acids that aikyiaiurnirsoxan beta is carried out modification, improve it and help catalytic capability
3) since aluminium triethyl with after aluminium isobutyl is mixed, the reactive behavior reduction can adopt the direct reaction legal system to be equipped with boron-aluminium-oxygen alkane.Reaction is easy to control, boron-aluminium-oxygen alkane productive rate height, and purity is also very high.
4) ethylene polymerization activity of Zhi Bei boron-aluminium-oxygen alkane can reach the level of methylaluminoxane (MAO).
Embodiment
Below in conjunction with embodiment the present invention is elaborated.
Embodiment 1
The preparation of boron-aluminium-oxygen alkane is to prepare under the condition of the anhydrous and oxygen-free of standard.Concrete synthetic method is: in 500 milliliters reaction flask, add 200 milliliters of toluene successively, and 0.16 mole of triethyl aluminum, 0.04 mole of triisobutyl aluminium, and at room temperature stirred 30 minutes.Then above-mentioned toluene was reacted 1 hour with 0.004 mole of phenyl-boron dihydroxide at 0 ℃; The solution that obtains is cooled to-78 ℃, under fully stirring, slowly drips 3.0 gram water.After water adds, return to room temperature naturally, ageing 48 hours obtains the toluene solution of water white boron-aluminium-oxygen alkane.
Embodiment 2
The preparation method is with example 1, and wherein the alkylboronic acids of Jia Ruing is 0.004 mole of butyl boron dihydroxide, and all the other proportionings are with example 1.
Embodiment 3
The preparation method is with example 1, and wherein the alkylboronic acids of Jia Ruing is 0.004 mole of 4-fluoro phenyl, and all the other proportionings are with example 1.
Embodiment 4
The preparation method is with example 1, and wherein the amount of the phenyl-boron dihydroxide of Jia Ruing is 0.01 mole, and the water yield of adding is 2.88 grams, and all the other proportionings are with example 1.
Embodiment 5
The preparation method is with example 1, and wherein the amount of the phenyl-boron dihydroxide of Jia Ruing is 0.02 mole, and the water yield of adding is 2.70 grams, and all the other proportionings are with example 1.
Embodiment 6
The preparation method is with example 1, and wherein the amount of the 4-fluoro phenyl of Jia Ruing is 0.02 mole, and the water yield of adding is 2.70 grams, and all the other proportionings are with example 1.
The polymerization activity evaluation of boron-aluminium-oxygen alkane promotor
The boron-aluminium-oxygen alkane that in embodiment 1-6, prepares help catalytic performance according to following method evaluation.Under 0 ℃, in 250 milliliters the reaction flask that is full of ethylene gas, add 100 milliliters of toluene successively, a spot of triisobutyl aluminium (, driving away the trace impurity in the reaction system) and boron-aluminium-oxygen alkane as pickling agent.After ethene is saturated in toluene, add 0.2 mmole { DAD (Me, Me) } NiBr
2, DAD (Me, Me)=2,6-iPrC
6H
4-N=C (Me)-C (Me)=N-C
6H
4IPr-2,6 or 2,6-two [1-(2,6-diisopropyl benzene industry amine) ethyl] pyridyl iron protochloride.The pressure of ethene keeps 1 normal atmosphere in polymerization process.After polymerase 10 .5 hour, with acidifying ethanol termination reaction, polymkeric substance behind washing, suction filtration 60 ℃ of following vacuum-dryings to constant weight, polymerization activity is calculated in weighing.The evaluation result of boron-aluminium-oxygen alkane sees Table 1.
The evaluation result 1 of table 1 boron-aluminium-oxygen alkane)
| Promotor | Polymerization activity (10 6Gram polymkeric substance/mole nickel *Hour) |
| MAO 1)Embodiment 1 1)Embodiment 2 1)Embodiment 3 1)Embodiment 4 1)Embodiment 5 1)Embodiment 6 1) MAO 2)Embodiment 1 2)Embodiment 5 2) | 2.37 1.06 0.32 1.41 1.99 2.46 2.25 4.19 3.20 4.50 |
1) polymerizing condition: [Ni]=2*10
-5M, Al/Zr=1000,0 ℃, 0.5 hour, 1atm ethene.
2) polymerizing condition: [Fe]=2*10
-5M, Al/Zr=3000,50 ℃, 0.5 hour, 1atm ethene.
Claims (6)
1. boron-aluminium-oxygen alkane is characterized in that: it is obtained by organo-aluminium compound and alkylboronic acids and water reaction, and its structural formula is [Al (R1)-O]
m-[Al (R2)-O]
n-[B (R3)-O]
p, R1 wherein, R2 is an alkyl, and R3 is alkyl or aromatic base, and the m/n ratio is 19～0.05, (m+n)/the p ratio is 100～3.
2. a kind of boron-aluminium-oxygen alkane according to claim 1 is characterized in that: said R1 is an ethyl, and R2 is an isobutyl-, and R3 is a butyl, phenyl or 4-fluoro phenyl, and the m/n ratio is 2～0.5, (m+n)/the p ratio is 20～10.
3. the preparation method of a boron-aluminium-oxygen alkane, it is characterized in that: under argon gas atmosphere, under-30 ℃～0 ℃, be the toluene mixing solutions reaction of 0.05: 0.95 to 0.95: 0.05 triethyl aluminum and triisobutyl aluminium with alkylboronic acids and mol ratio earlier, wherein the molar ratio of B/Al is 1: 100～30: 100; Slowly add distilled water again at-78 ℃～-30 ℃, the molar ratio of water and aluminum alkyls is 0.6: 1 to 0.95: 1; After water added, reaction system slowly returned to room temperature, and the toluene solution of this boron-aluminium-oxygen alkane gets final product after at room temperature placing 1 to 48 hour.
4. the preparation method of a kind of boron-aluminium-oxygen alkane according to claim 3, the mol ratio that it is characterized in that triethyl aluminum and triisobutyl aluminium is 0.6: 0.4～0.8: 0.2, the mol ratio of boron and aluminium is 5: 100～10: 100, and the mol ratio of water and aluminium is 0.8～0.9.
5. the purposes of a boron-aluminium-oxygen alkane, the purposes that it is characterized in that it is the promotor of late transition metal catalyst, can the catalysis alpha-olefine polymerizing, the preparation high molecular weight polymers.
6. the purposes of a kind of boron-aluminium-oxygen alkane according to claim 5 is characterized in that said late transition metal catalyst is iron, cobalt, nickel organometallic compound.
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