Silanization organic phenol-nanometer silicon dioxide system as well as preparation method and application thereof

A nano-silica and organic phenol technology, applied in the field of new materials, can solve problems such as easy phase separation, affecting the application effect of nanoparticles, and poor bonding of polymer dispersion interfaces, achieving low prices and increasing space Stabilizing effect, effect of improving heat resistance

Inactive Publication Date: 2019-01-08
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to nano-SiO 2 There are a large number of hydroxyl groups on the surface of the particles, the surface activity is very high, it is in a thermodynamically unstable state, and it is easy to agglomerate. The dispersion in the polymer and the interface bonding with the polymer are not good, and phase separation is prone to occur, which affects the nano-particles. Practical application effect of particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step, the preparation of the silylated organic phenol-nano silica system: put 6g of tetrapropoxysilane and 150g of phenol in a four-necked flask heated by a water bath at 40°C, and stir at 500 r / min for 0.5h, Subsequently, the mixed solution containing 8g of ammonia water and 10g of water was added dropwise from a constant pressure funnel for 1h, and after the dropwise addition was completed, stirring was continued for 1h, 3g of trimethylchlorosilane was added, and the reaction was continued for 3h to obtain trimethylchlorosilylated resorcinol - Nano silica system. The second step is to prepare raw materials for silanized nano-silica modified phenolic resin: place the four-necked flask in a 40°C water bath, mix 105g trimethylchlorosilanized resorcinol-nano-silica system, 3g hydrogen Calcium oxide was added to the four-necked flask in turn, stirred at 500r / min, and the temperature was raised to 75°C, and a total of 24g of paraformaldehyde was added in three bat...

Embodiment 2

[0021] The first step is to chemically degrade lignin: put 15g of water and 15g of lignin in a four-neck flask heated by a water bath at 50°C, add 5g of 20 wt.% NaOH solution and 2g of H 2 o 2 Solution, stirred under the condition of 500r / min for 2h, the pretreatment of chemical degradation of lignin; the second step, the preparation of silylated organic phenol-nanometer silicon dioxide system: put 6g tetrapropoxysilane and 170g phenol in In a four-neck flask heated in a water bath at 40°C, stir at 500 r / min for 0.5h, then add the mixture containing 8g of 25wt.% ammonia water and 10g of water dropwise for 1h from a constant pressure funnel, and continue stirring for 1h after the addition is complete , add 3g of trimethylchlorosilane, and continue to react for 3h to obtain propyltrimethoxysilanization-nano-silica system; the third step is to prepare raw materials for silylated nano-silica lignin-based phenolic resin: 90g Propyltrimethoxysilanization-nanometer silicon dioxide s...

Embodiment 3

[0023] The first step is to carry out chemical degradation of lignin: 18g of water and 18g of lignin are placed in a four-neck flask heated by a water bath at 50°C, and 4.5g of 20wt.% NaOH solution and 2g of H 2 o 2Solution, stirred for 2h under the condition of 500r / min, the pretreatment of chemical degradation of lignin; the second step, the preparation of silylated organic phenol-nanometer silicon dioxide system: put 6g tetraethyl orthosilicate and 180g vanillin In a four-neck flask heated in a water bath at 40°C, stir at 500 r / min for 0.5h, then add the mixture containing 9g of 12wt.% sodium hydroxide solution and 8g of water dropwise for 1.5h from a constant pressure funnel, and dropwise add Continue stirring for 1 hour after completion, add 3g of 1,1,3,3-tetramethyldisilane, and continue the reaction for 3 hours to obtain 1,1,3,3-tetramethyldisilylated vanillin-nano-silicon dioxide system; Three steps, raw material preparation of silanized nano-silica lignin-based pheno...

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PUM

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Abstract

The invention relates to a silanization organic phenol-nanometer silicon dioxide system as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing 6 parts by weight of a silicon source and 40 parts by weight of an organic phenol substance into a four-neck bottle, maintaining stirring for half an hour under the conditions of 40 DEG C and 500 r/min, dropwise adding a mixed liquid of 8 parts by weight of an alkaline catalyst and 10 parts by weight of water for 2 hours by a constant-pressure funnel, adding 3 to 6 parts by weight of a silane coupling agent, and performing a reaction for 4 hours to obtain the silanization organic phenol-nanometer silicon dioxide system.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a silanized organic phenol-nanometer silicon dioxide system and its preparation method and application. Background technique [0002] Phenolic foam is a new type of foam developed in recent years. Compared with polyurethane foam and polystyrene foam, phenolic foam has obvious advantages in high temperature resistance. Phenolic foam can be used for a long time in the temperature range of -196-200°C without deformation and degradation. Phenolic foam also has light weight, heat insulation, low smoke when burning, low toxicity, no obvious flame, no dripping, low thermal conductivity, good heat insulation performance, excellent electrical insulation performance, chemical corrosion resistance, mold resistance Therefore, it has broad application prospects in building insulation, petrochemical industry, and aerospace vehicle insulation. Phenolic foam has excellent f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/06C08K3/36C08K5/13C08G8/28
CPCC08G8/28C08K3/36C08K5/13C08K9/06C08K2201/011
Inventor 胡立红张娜薄采颖周永红
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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