CN101905172A - Functional hyperbranched polymer supported platinum catalyst, preparation method and application thereof - Google Patents
Functional hyperbranched polymer supported platinum catalyst, preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a functional hyperbranched polymer supported platinum catalyst, a preparation method and application thereof. The preparation method has a technical scheme of: dissolving chloroplatinic acid or chloroplatinate into an organic solvent; then adding a terminal carboxyl group or terminal hydroxyl group hyperbranched polymer and a certain quantity of sodium bicarbonate into the organic solvent, and uniformly mixing the mixture; performing ultrasonic treatment on the mixture under the power of 700 to 1,200 W for 10 to 20 min; stirring and reacting at 30 to 90 DEG C for 1 to 6h under a nitrogen condition; and standing the mixture for 6 hours at the room temperature, vaporizing the solvent under a vacuum condition to obtain loosened powder, washing the obtained loosened powder with distilled water, drying the powder in vacuum to obtain the functional hyperbranched polymer supported platinum catalyst. The functional hyperbranched polymer supported nanometer platinum oxide catalyst prepared by the method is uniformly dispersed in a functional hyperbranched polymer carrier. The catalyst prepared by the method has the advantages of high catalytic activity, easy separation and the like in a hydrosilation addition reaction, simple production process, low cost and easy industrialization.
Description
Technical field
The present invention relates to be used for the technical field of the platinum catalyst preparation of hydrosilylation.Be specifically related to a kind of functional hyperbranched polymer supported platinum catalyst and method for making thereof and application.
Background technology
The catalyst of hydrosilylation of the prior art mostly is the complex of VIII family noble metal, and wherein the catalytic activity with platinum is the highest.Platinum catalyst has very high catalytic activity to the homogeneous phase hydrosilylation, but the poor stability of catalyst, perishable hardware, induction period is wayward, regioselectivity is poor, be difficult to separate recycling.And platinum catalyst had both had the stable performance of heterogeneous solid catalyst, not etching apparatus and easy advantage such as recycling after immobilized, had the active high characteristics of homogeneous catalyst again.The carrier of the platinum catalyst of existing report mostly is cross-linked polystyrene resin, polymethacrylates, polysiloxanes, polyamide, SiO
2, Al
2O
3, cellular solid such as MgO, active carbon etc., the catalytic activity of the platinum catalyst that these are material solid supported generally will be lower than homogeneous catalyst.Therefore the novel heterogeneous catalysis of characteristics of developing easily separated, the stable in properties of the high activity that has the homogeneous phase complex catalyst simultaneously and heterogeneous catalysis is expected to be widely used.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of functional hyperbranched polymer supported platinum catalyst is provided, wherein functional hyperbranched polymer is superbrnaching end-hydroxy polymer or end carboxyl super branched polymer, provide by Suzhou HyperT Resin Science ﹠ Technology Co., Ltd., the structural formula of described superbrnaching end-hydroxy polymer is:
The structural formula of described end carboxyl super branched polymer is:
Platinum is connected with coordinate bond with dissaving polymer with the platinum dioxide of+4 valencys in the described functional hyperbranched polymer supported platinum catalyst, and wherein platinum content is 0.75~17.35wt%.
Another object of the present invention has been to provide a kind of method for making of functional hyperbranched polymer supported platinum catalyst, and its technical scheme is as follows:
Chloroplatinic acid (or chloroplatinate) is dissolved in the organic solvent, adding end carboxyl or superbrnaching end-hydroxy polymer and a certain amount of sodium acid carbonate then mixes, ultrasonic 10-20min under the power of 700-1200W, under the normal pressure condition of nitrogen gas, behind the 30-90 ℃ of stirring reaction 1-6h, after room temperature leaves standstill 6h, steam solvent under 60 ℃ of vacuum conditions, the loose powder that obtains promptly obtains functional hyperbranched polymer supported platinum catalyst through 3 final vacuum dryings of distillation washing.
The preparation principle of functional hyperbranched polymer supported platinum catalyst is in this technical scheme: after at first utilizing organic solvent dissolution chloroplatinic acid or chloroplatinate, be dispersed on the internal cavity or surface of dissaving polymer, the functional group hydroxyl or the carboxyl on platinum in chloroplatinic acid or the chloroplatinate and dissaving polymer internal cavity or surface carry out coordination, utilize sodium acid carbonate and chloroplatinic acid or chloroplatinate to react then and remove chlorion, what obtain at last is the functional hyperbranched polymer supported platinum catalyst of platinum dioxide and functional hyperbranched polymer coordination.
The mass ratio of described chloroplatinic acid (or chloroplatinate), functional hyperbranched polymer and sodium acid carbonate is: (0.2-5.0): 10.0: (0.3-5.0), chloroplatinate is a kind of in potassium chloroplatinate and the platinic sodium chloride or both arbitrary proportion mixtures.
Described organic solvent is one or more the mixture in ethanol, normal propyl alcohol, isopropyl alcohol, n-butanol, oxolane, the pyridine, its consumption is 20~150 times of chloroplatinic acid (or chloroplatinate) quality, and fully dissolved chlorine platinic acid (or chloroplatinate) gets final product.
A further object of the invention has been to provide a kind of application of functional hyperbranched polymer supported platinum catalyst, is specially the application in hydrosilylation.
The beneficial effect and the advantage of technical solution of the present invention are as follows:
1, functional hyperbranched polymer supported platinum catalyst of the present invention is a kind of heterogeneous catalysis, separates easily after catalytic reaction is finished, and can reuse;
2, the particle diameter of functional hyperbranched polymer supported platinum catalyst of the present invention is little, and specific area is big, and platinum is uniformly dispersed, and is active high;
3, the catalytic activity height of functional hyperbranched polymer supported platinum catalyst of the present invention has reduced the consumption of noble metal platinum, has saved production cost;
4, functional hyperbranched polymer supported platinum catalyst of the present invention has the excellent rheological properties of dissaving polymer, and intramolecule contains a large amount of molecule holes, makes prepared hydrosilylation molecular weight of product narrowly distributing;
5, the synthesis technique of functional hyperbranched polymer supported platinum catalyst of the present invention is simple, and raw material is easy to get, and is fit to suitability for industrialized production.
Description of drawings
Fig. 1 is the transmission electron microscope photo of the prepared catalyst of embodiments of the invention 5.
The specific embodiment
The present invention is described in detail below in conjunction with specific embodiment, but protection scope of the present invention is not limited to these embodiment, and all equivalences of doing according to the spiritual essence of technical solution of the present invention change or modify, and all should be covered by in protection scope of the present invention.Used functional hyperbranched polymer provides by Suzhou HyperT Resin Science ﹠ Technology Co., Ltd. among the present invention, and other chemical raw material is the commercial goods.
Embodiment 1
A kind of superbrnaching end-hydroxy polymer supported platinum catalyst, its preparation method is as follows:
0.2g is analyzed pure chloroplatinic acid to be dissolved in 20g and to analyze in the mixed solvent that pure isopropyl alcohol and 10g analyze pure tetrahydrofuran, adding 10.0g superbrnaching end-hydroxy polymer H101 (purity is greater than 95wt%) and 0.3g analysis pure sodium bicarbonate mixes, behind ultrasonic 20min under the power of 700W, under the normal pressure condition of nitrogen gas, 30 ℃ of stirring reaction 6h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the superbrnaching end-hydroxy polymer supported platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 0.75wt% (being designated as Pt/H101-75) as calculated.
Embodiment 2
A kind of superbrnaching end-hydroxy polymer supported platinum catalyst, its preparation method is as follows:
0.4g is analyzed pure platinic sodium chloride to be dissolved in 40g and to analyze in the pure propyl alcohol, adding 10.0g superbrnaching end-hydroxy polymer H102 (purity is greater than 95wt%) and 0.35g analysis pure sodium bicarbonate mixes, behind ultrasonic 18min under the power of 800W, under the normal pressure condition of nitrogen gas, 40 ℃ of stirring reaction 5h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash altogether 3 times, wash out sodium chloride, promptly obtain the superbrnaching end-hydroxy polymer supported platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 1.39wt% (being designated as Pt/H102-139) as calculated.
Embodiment 3
A kind of superbrnaching end-hydroxy polymer supported platinum catalyst, its preparation method is as follows:
0.8g is analyzed pure chloroplatinic acid to be dissolved in 60g and to analyze in the pure isopropyl alcohol, adding 10.0g superbrnaching end-hydroxy polymer H103 (purity is greater than 95wt%) and 1.0g analysis pure sodium bicarbonate mixes, behind ultrasonic 16min under the power of 900W, under the normal pressure condition of nitrogen gas, 50 ℃ of stirring reaction 4h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the superbrnaching end-hydroxy polymer supported platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 3.00wt% (being designated as Pt/H103-300) as calculated.
Embodiment 4
A kind of superbrnaching end-hydroxy polymer supported platinum catalyst, its preparation method is as follows:
1.2g is analyzed pure platinic sodium chloride to be dissolved in 60g and to analyze in the pure butanols, adding 10.0g superbrnaching end-hydroxy polymer H202 (purity is greater than 95wt%) and 1.5g analysis pure sodium bicarbonate mixes, behind ultrasonic 14min under the power of 1000W, under the normal pressure condition of nitrogen gas, 60 ℃ of stirring reaction 4h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain terminal hydroxy group type hyperbranched polymer supported platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 4.16wt% (being designated as Pt/H202-416) as calculated.
Embodiment 5
A kind of superbrnaching end-hydroxy polymer supported platinum catalyst, its preparation method is as follows:
1.8g is analyzed pure chloroplatinic acid to be dissolved in the 40g analysis pure tetrahydrofuran, adding 10.0g superbrnaching end-hydroxy polymer H302 (purity is greater than 95wt%) and 2.0g analysis pure sodium bicarbonate mixes, behind ultrasonic 10min under the power of 1200W, under the normal pressure condition of nitrogen gas, 70 ℃ of stirring reaction 3h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the superbrnaching end-hydroxy polymer supported platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 6.75wt% (being designated as Pt/H302-675) as calculated, and its transmission electron microscope photo is seen accompanying drawing.
Embodiment 6
A kind of end carboxyl super branched polymer solid-borne platinum catalyst, its preparation method is as follows:
2.5g is analyzed pure chloroplatinic acid to be dissolved in the 50g analysis pure pyridine, adding 10.0g end carboxyl super branched polymer C101 (purity is greater than 95wt%) and 2.8g analysis pure sodium bicarbonate mixes, behind ultrasonic 17min under the power of 800W, under the normal pressure condition of nitrogen gas, 80 ℃ of stirring reaction 2h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the end carboxyl super branched polymer solid-borne platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 9.34wt% (being designated as Pt/C101-934) as calculated.
Embodiment 7
A kind of end carboxyl super branched polymer solid-borne platinum catalyst, its preparation method is as follows:
3.5g is analyzed pure platinic sodium chloride to be dissolved in 200g and to analyze in the pure absolute ethyl alcohol, adding 10.0g end carboxyl super branched polymer C 102 (purity is greater than 95wt%) and 3.6g analysis pure sodium bicarbonate mixes, behind ultrasonic 16min under the power of 900W, under the normal pressure condition of nitrogen gas, 90 ℃ of stirring reaction 1h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the end carboxyl super branched polymer solid-borne platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 12.15wt% (being designated as Pt/C102-1215) as calculated.
Embodiment 8
A kind of end carboxyl super branched polymer solid-borne platinum catalyst, its preparation method is as follows:
5.0g is analyzed pure platinic sodium chloride to be dissolved in 100g and to analyze in the mixed solvent that pure isopropyl alcohol and 30g analyze pure tetrahydrofuran, adding 10.0g end carboxyl super branched polymer C103 (purity is greater than 95wt%) and 5.0g analysis pure sodium bicarbonate mixes, behind ultrasonic 16min under the power of 800W, under the normal pressure condition of nitrogen gas, 60 ℃ of stirring reaction 2h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the end carboxyl super branched polymer solid-borne platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 17.35wt% (being designated as Pt/C103-1735) as calculated.
Embodiment 9
A kind of end carboxyl super branched polymer solid-borne platinum catalyst, its preparation method is as follows:
1.2g is analyzed pure platinic sodium chloride to be dissolved in 40g and to analyze in the mixed solvent that pure isopropyl alcohol and 20g analyze pure tetrahydrofuran, adding 10.0g end carboxyl super branched polymer C202 (purity is greater than 95wt%) and 1.0g analysis pure sodium bicarbonate mixes, behind ultrasonic 16min under the power of 900W, under the normal pressure condition of nitrogen gas, 60 ℃ of stirring reaction 3h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the end carboxyl super branched polymer solid-borne platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 4.16wt% (being designated as Pt/C202-416) as calculated.
Embodiment 10
A kind of end carboxyl super branched polymer solid-borne platinum catalyst, its preparation method is as follows:
1.5g is analyzed pure potassium chloroplatinate to be dissolved in 40g and to analyze in the mixed solvent that pure propyl alcohol and 30g analyze pure pyridine, adding 10.0g end carboxyl super branched polymer C302 (purity is greater than 95wt%) and 1.5g analysis pure sodium bicarbonate mixes, behind ultrasonic 18min under the power of 700W, under the normal pressure condition of nitrogen gas, 50 ℃ of stirring reaction 3h, after at room temperature leaving standstill 6h again, steam solvent under 60 ℃ of vacuum conditions, obtain loose powdered, then this powder is put into the Buchner funnel that is lined with filter paper, each distilled water 20ml that uses, wash 3 times, wash out sodium chloride, promptly obtain the end carboxyl super branched polymer solid-borne platinum catalyst 60 ℃ of vacuum drying again, its platinum content is 6.02wt% (being designated as Pt/C302-602) as calculated.
Embodiment 11
The hydrosilylation of the styrene catalyzed respectively and tetramethyl disiloxane (mol ratio is 2.5: 1.0) of the functional hyperbranched polymer supported platinum catalyst that makes with embodiment 1-10, by the examination of infrared spectrum product at 2125cm
-1Whether there is absworption peak to identify whether hydrosilylation is complete about (absworption peak of si-h bond).Functional hyperbranched polymer supported platinum catalyst and two kinds of classical catalyst of having compared embodiments of the invention 1-10 preparation, the activity of Speier catalyst (referenced patent US2823218 preparation) and Karstedt catalyst (referenced patent US3775452 preparation), the result is as shown in table 1, catalytic activity is represented catalytic activity with the maximum molal quantity that every mole of platinum can the addition of catalysis si-h bond, the platinum catalyst that the specific activity of the hyperbranched polymer supported platinum catalyst of the presentation of results the present invention preparation in the table 1 is traditional active much higher.
The specific activity of several platinum catalysts of table 1
The catalyst title | Catalytic activity, n (Si-H)/n (Pt) |
The Speier catalyst | 8.00×10 2 |
The Karstedt catalyst | 1.65×10 4 |
Embodiment 1 (Pt/H101-75 catalyst) | 1.92×10 4 |
Embodiment 2 (Pt/H102-139 catalyst) | 2.06×10 4 |
Embodiment 3 (Pt/H103-300 catalyst) | 2.72×10 4 |
Embodiment 4 (Pt/H202-416 catalyst) | 3.82×10 4 |
Embodiment 5 (Pt/H302-675 catalyst) | 3.20×10 4 |
Embodiment 6 (Pt/C101-934 catalyst) | 3.18×10 4 |
Embodiment 7 (Pt/C102-1215 catalyst) | 2.92×10 4 |
Embodiment 8 (Pt/C103-1735 catalyst) | 2.90×10 4 |
Embodiment 9 (Pt/C202-416 catalyst) | 4.12×10 4 |
Embodiment 10 (Pt/C302-602 catalyst) | 3.42×10 4 |
Claims (10)
1. functional hyperbranched polymer supported platinum catalyst, it is characterized in that: the content of platinum is 0.75~17.35wt%, and the valence state of platinum is+4, and platinum connects with coordinate bond with the form and function type dissaving polymer of platinum dioxide.
2. a kind of functional hyperbranched polymer supported platinum catalyst as claimed in claim 1 is characterized in that: described functional hyperbranched polymer is superbrnaching end-hydroxy polymer or end carboxyl super branched polymer.
5. the preparation method of the described a kind of functional hyperbranched polymer supported platinum catalyst of claim 2, it is characterized in that operating procedure is as follows: at first chloroplatinic acid or chloroplatinate are dissolved in the organic solvent, add described terminal hydroxy group or end carboxyl super branched polymer and sodium acid carbonate then, mix, behind the ultrasonic 10-20min, under condition of nitrogen gas, 30-90 ℃ of stirring reaction 1-6h, after at room temperature leaving standstill 6h again, steam solvent under the vacuum condition, the loose powder that obtains is through distillation washing final vacuum drying, promptly obtain functional hyperbranched polymer supported platinum catalyst, described chloroplatinic acid or chloroplatinate, the mass ratio of dissaving polymer and sodium acid carbonate is: 0.2-5.0: 10.0: 0.3-5.0.
6. the preparation method of a kind of functional hyperbranched polymer supported platinum catalyst as claimed in claim 5 is characterized in that: described chloroplatinate is a kind of in platinic sodium chloride and the potassium chloroplatinate or both arbitrary proportion mixtures.
7. as the preparation method of claim 5 or 6 described a kind of functional hyperbranched polymer supported platinum catalysts, it is characterized in that: the power of described ultrasonic 10-20min is 700-1200W.
8. as the preparation method of claim 5,6 or 7 described a kind of functional hyperbranched polymer supported platinum catalysts, it is characterized in that: described organic solvent is one or more the arbitrary proportion mixture in ethanol, normal propyl alcohol, isopropyl alcohol, n-butanol, oxolane and the pyridine.
9. as the preparation method of claim 5,6,7 or 8 described a kind of functional hyperbranched polymer supported platinum catalysts, it is characterized in that: the consumption of described organic solvent is chloroplatinic acid or chloroplatinate quality 20~150 times.
10. the application of arbitrary described functional hyperbranched polymer supported platinum catalyst in hydrosilylation among the claim 1-9.
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