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Method for synthesizing agricultural synergist from platinum-loaded modified silicon catalyst

A technology of platinum catalyst and modified silicon, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of difficult separation of catalysts and poor recyclability, Achieve the effect of small amount of catalyst, high conversion rate, high catalytic activity and selectivity

Inactive Publication Date: 2018-04-17
SHAANXI SHENGMAI PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, such addition reactions are catalyzed by catalysts containing transition metals such as platinum and palladium. Although they have the advantages of high selectivity and high catalytic activity, the disadvantages of difficult separation and poor recyclability of the catalyst inhibit their general application in industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method for synthesizing agricultural synergist with modified silicon supported platinum catalyst comprises the following steps:

[0020] (1) Disperse silica in deionized water, ultrasonically disperse for 30min under the conditions of ultrasonic power 200W and ultrasonic frequency 30Hz, then filter, and vacuum dry at 60°C for 4h to obtain mesoporous silica;

[0021] (2) Dissolve chitosan in an acetic acid solution with a concentration of 0.5 mol / L, stir and heat up to 50°C, react for 10 minutes, then add the mesoporous silica prepared in step (1), heat up to 100°C and reflux React for 1 hour, stop heating, cool down to room temperature naturally, add a sodium hydroxide solution with a mass concentration of 5%, filter after standing for 3 hours, wash the filter residue with distilled water 5 times, and vacuum-dry at 70°C for 24 hours to obtain chitosan- Silica ligand; Wherein, the mass ratio of chitosan, acetic acid solution, mesoporous silica, sodium hydroxide solut...

Embodiment 2

[0025] The method for synthesizing agricultural synergist with modified silicon supported platinum catalyst comprises the following steps:

[0026] (1) Disperse silica in deionized water, ultrasonically disperse for 50min under the conditions of ultrasonic power 400W and ultrasonic frequency 30Hz, then filter, and vacuum dry at 60°C for 4h to obtain mesoporous silica;

[0027] (2) Dissolve chitosan in an acetic acid solution with a concentration of 0.5 mol / L, stir and heat up to 50°C, react for 10 minutes, then add the mesoporous silica prepared in step (1), heat up to 100°C and reflux React for 1 hour, stop heating, cool down to room temperature naturally, add a sodium hydroxide solution with a mass concentration of 5%, filter after standing for 3 hours, wash the filter residue with distilled water 5 times, and vacuum-dry at 70°C for 24 hours to obtain chitosan- Silica ligand; Wherein, the mass ratio of chitosan, acetic acid solution, mesoporous silica, sodium hydroxide solut...

Embodiment 3

[0031] The method for synthesizing agricultural synergist with modified silicon supported platinum catalyst comprises the following steps:

[0032] (1) Disperse silica in deionized water, ultrasonically disperse for 40min under the conditions of ultrasonic power 300W and ultrasonic frequency 30Hz, then filter, and vacuum dry at 60°C for 4h to obtain mesoporous silica;

[0033] (2) Dissolve chitosan in an acetic acid solution with a concentration of 0.5 mol / L, stir and heat up to 50°C, react for 10 minutes, then add the mesoporous silica prepared in step (1), heat up to 100°C and reflux React for 1 hour, stop heating, cool down to room temperature naturally, add a sodium hydroxide solution with a mass concentration of 5%, filter after standing for 3 hours, wash the filter residue with distilled water 5 times, and vacuum-dry at 70°C for 24 hours to obtain chitosan- Silica ligand; Wherein, the mass ratio of chitosan, acetic acid solution, mesoporous silica, sodium hydroxide solut...

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PUM

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Abstract

The invention discloses a method for synthesizing an agricultural synergist from platinum-loaded modified silicon catalyst, which comprises the following steps: (1) silica is dispersed into deionizedwater, ultrasonic dispersion is carried out, filtration is carried out and then drying under vacuum is carried out, so that mesoporous silica is obtained; (2) chitosan is dissolved into acetic acid solution, the mesoporous silica is then added, cooling is carried out after reflux reaction, sodium hydroxide solution is added, filtration is carried out, filter residue is washed, and after vacuum drying, a chitosan-silica ligand is obtained; (3) chloroplatinic acid-isopropanol solution, the chitosan-silica ligand and absolute ethyl alcohol are mixed, heated to react, then cooled and filtered, andafter vacuum drying, the platinum-loaded modified silicon catalyst is obtained; (4) allyl alcohol polyoxyalkylhydroxy ether and the platinum-loaded modified silicon catalyst are mixed, heptamethyltrisiloxane is added, filtration is carried out, and filter residue is dried. By preparing the platinum-loaded modified silicon catalyst with high thermal stability, the catalyst is used for catalysis toprepare the agricultural synergist, and the conversion rate is high.

Description

technical field [0001] The invention belongs to the technical field of agricultural synergists, in particular to a method for synthesizing agricultural synergists with a modified silicon-supported platinum catalyst. Background technique [0002] Agricultural synergists are hydrophobic polymers with polydimethylsiloxane as the main chain. Because of their excellent wettability, super-extensibility and rain erosion resistance, they have potential application value in agriculture. For example, it can reduce the surface tension of the plant and increase the spreading area of ​​the drug on the plant, thereby increasing the absorption of the drug by the plant and maximizing the drug properties. The most effective way to synthesize agricultural synergists is the hydrosilylation reaction of unsaturated substances and hydrogen-containing silicone oils. Usually, such addition reactions are catalyzed by catalysts containing transition metals such as platinum and palladium. Although th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/336B01J31/22
CPCC08G65/336B01J31/2217B01J2531/828
Inventor 王耀斌
Owner SHAANXI SHENGMAI PETROLEUM