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Preparation method and application of supported platinum catalyst

A platinum catalyst and supported technology, which is applied in the field of preparation of supported platinum catalysts for hydrosilylation, can solve the problems of high cost, low catalyst activity, high system viscosity, etc., achieve good recycling performance, improve catalytic activity, High catalytic activity

Active Publication Date: 2020-06-16
WANHUA CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The use of a homogeneous platinum catalyst in the hydrosilylation step has the advantage of high catalytic efficiency, but there are problems of difficulty in removing the platinum catalyst and high cost; however, the removal and reuse of the platinum catalyst can be achieved by using a supported platinum catalyst. However, there are disadvantages of low catalyst activity and large dosage
In particular, the double-bond-terminated polyethers used in the synthesis of silane-modified polyether resins are all high-molecular-weight polyethers, and the high viscosity of the system increases the difficulty of catalysis and recovery of the catalyst.

Method used

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  • Preparation method and application of supported platinum catalyst
  • Preparation method and application of supported platinum catalyst
  • Preparation method and application of supported platinum catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of embodiment 1 supported platinum catalyst a

[0054] Step 1: Equip a 5L three-necked flask with a stirrer, a thermometer, and a reflux condensing device, add 300g of nano-silica, 300g of KH550, and 2,000g of xylene, stir and heat up to 100°C for 8 hours, and filter to obtain a modified product containing active hydrogen on the surface For crude carrier, the modified carrier was washed and filtered 3 times with xylene for use.

[0055] Step 2: Add 300g of modified carrier with active hydrogen on the surface and 300g of xylene into a 5L reactor, add 3.0g of boron trifluoride ether, raise the temperature to 105°C, control the flow rate to keep the pressure less than 0.3MPa and continue to pour into the reactor Feed a mixture of 692g propylene oxide and 208g allyl glycidyl ether, and continue to react for 3 hours after the feeding is completed. After the reaction is completed, the material is filtered, and washed and filtered with xylene repeatedly for 3 t...

Embodiment 2

[0057] The preparation of embodiment 2 supported platinum catalyst b

[0058] Step 1: Equip a 5L three-necked flask with a stirrer, a thermometer, and a reflux condensing device, add 300g of nano-silicon dioxide, 390g of KH550, and 2000g of xylene, stir and heat up to 103°C for 6 hours, and filter to obtain a modified product containing active hydrogen on the surface For the crude carrier, the modified carrier was washed and filtered 4 times with xylene for use.

[0059] Step 2: Add 300g of the modified carrier with active hydrogen on the surface and 300g of xylene into a 5L reactor, add 6.0g of boron trifluoride ether, raise the temperature to 115°C, control the flow rate to keep the pressure less than 0.3MPa and continue to pour into the reactor Pass through the mixture of 1250g propylene oxide and 250g allyl glycidyl ether, and continue to react for 2 hours after the feeding is completed. After the reaction is completed, the material is filtered, and repeated washing and fi...

Embodiment 3

[0061] The preparation of embodiment 3 supported platinum catalyst c

[0062] Step 1: Equip a 5L three-necked flask with a stirrer, a thermometer, and a reflux condensing device, add 300g of nano-silica, 450g of KH550, and 2000g of toluene, stir and heat up to 105°C for 5 hours, and filter to obtain a modified carrier with active hydrogen on the surface For the crude product, the modified carrier was washed and filtered 5 times with toluene for use.

[0063] Step 2: Add 300g of the modified carrier with active hydrogen on the surface and 300g of toluene into a 5L reaction kettle, add 9.0g of boron trifluoride ether, raise the temperature to 130°C, control the flow rate to keep the pressure less than 0.3MPa and continue to flow into the reaction kettle Add the mixture of 1909g propylene oxide and 191g vinyl glycidyl ether, continue to react for 1h after the feeding is finished, filter the material after the reaction is finished, and repeat the washing and filtering for 5 times ...

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Abstract

The invention discloses a preparation method of a supported platinum catalyst, which comprises the following steps: 1. modifying a carrier by using a silane coupling agent to obtain a modified carriercontaining active hydrogen on the surface; 2, under the action of a Lewis acid catalyst, polymerizing propylene oxide and an epoxy compound containing double bonds on the modified carrier containingactive hydrogen on the surface obtained in the step 1 to obtain a modified carrier containing a comb-shaped polymer on the surface; 3, adding chloroplatinic acid and weak base into the modified carrier with the comb-shaped polymer on the surface obtained in the step 2, and reacting to obtain the supported platinum catalyst. High platinum loading capacity of the carrier is realized by introducing the comb-shaped polymer to the surface of the carrier, and the catalyst prepared by the preparation method has high catalytic activity in catalysis of silane modified polyether resin synthesis.

Description

technical field [0001] The invention belongs to the field of catalyst synthesis. Specifically, the present invention relates to a method for preparing a supported platinum catalyst for hydrosilylation. Background technique [0002] The hydrosilylation reaction refers to the addition reaction between organosilicon compounds containing silicon-hydrogen bonds and unsaturated compounds under certain conditions, and plays an important role in organosilicon chemistry. The occurrence of the hydrosilylation reaction depends on the catalysis of the catalyst, and platinum compounds are usually used as the hydrosilylation catalyst. Currently, widely used platinum catalysts are Speier catalyst (alcohol solution of chloroplatinic acid) and Karstedt catalyst (zero-valent monoatomic platinum complexed with vinyl-containing siloxane). Although these two catalysts have high activity, they are homogeneous catalysts. After the reaction, the catalysts are difficult to separate from the reacti...

Claims

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Application Information

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IPC IPC(8): B01J31/22C08G65/336
CPCB01J31/2291B01J31/1633C08G65/336B01J2531/828Y02P20/584
Inventor 石正阳秦承群刘斌殷玲吕树卫黎源
Owner WANHUA CHEM GRP