Silica with surface subjected to polymerization modification, and preparation method thereof

A silicon dioxide and modification technology, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problem that the improvement of the dispersion of silicon dioxide is not obvious, the modification effect is poor, and it is easy to be decomposed by water, etc. problems, to achieve the effect of solving poor product dispersibility, reducing average particle size, avoiding pollution and recycling problems

Inactive Publication Date: 2012-10-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used method is to carry out wet modification before drying of silica. There are many methods for wet surface modification of silica. However, in the existing wet modification methods, most of the modifiers are easily hydrolyzed organic compounds , has poor solubility in water and is easily decomposed by water, so the modification effect of using water as a solvent is poor
At the same time, most of the wet modification methods are modified after the silica is dried, and the silica particles are easy to form agglomeration during the drying process, which leads to the improvement of the dispersibility of the silica after drying. The effect is not significant

Method used

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  • Silica with surface subjected to polymerization modification, and preparation method thereof
  • Silica with surface subjected to polymerization modification, and preparation method thereof
  • Silica with surface subjected to polymerization modification, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 20 g of the undried silica filter cake directly prepared by the precipitation method into 80 ml of deionized water, stir evenly, and disperse ultrasonically for 20 minutes to form a silica suspension with a particle size of 1 μm;

[0022] Dissolve 0.3g of acrylic acid in 10ml of deionized water, pour it into a three-necked flask together with the previously prepared silica suspension, heat to 85°C while stirring, and keep it warm for 1 hour;

[0023] Weigh 0.2g of potassium persulfate and dissolve it in 40ml of deionized water, pour it into a three-necked flask, and react in a water bath at a constant temperature for 2 hours while stirring;

[0024] After the reaction was completed, the temperature was lowered, washed, suction filtered, and dried to obtain surface polymerization-modified silica with an average particle diameter of 306.3 nm.

[0025] figure 1 It is the infrared spectrogram of surface polymerization modified silica, which shows that acrylic acid has ...

Embodiment 2

[0027] Take 20 g of the undried silica filter cake directly prepared by the precipitation method, add it to 100 ml of deionized water, stir evenly, and disperse ultrasonically for 10 minutes to form a silica suspension with a particle size of 1 μm;

[0028] Dissolve 0.2g of acrylic acid in 6ml of deionized water, pour it into a three-necked flask together with the previously prepared silica suspension, heat to 75°C while stirring, and keep it warm for 1 hour;

[0029] Weigh 0.1g of potassium persulfate and dissolve it in 30ml of deionized water, pour it into a three-necked flask, and react in a water bath at a constant temperature for 2.5 hours while stirring;

[0030] After the reaction was completed, the temperature was lowered, washed, suction filtered, and dried to obtain surface polymerization-modified silica with an average particle diameter of 310.2 nm.

[0031] Particle size distribution analysis: d(0.1): 228.9nm, d(0.5): 292.1nm, d(0.9): 373.5nm; infrared spectrum ana...

Embodiment 3

[0033] Add 20 g of the undried silica filter cake directly prepared by the precipitation method into 90 ml of deionized water, stir evenly, and disperse ultrasonically for 10 minutes to form a silica suspension with a particle size of 1 μm;

[0034] Dissolve 0.35g of acrylic acid in 10ml of deionized water, pour it into a three-necked flask together with the previously prepared silica suspension, heat to 60°C while stirring, and keep it warm for 2 hours;

[0035] Weigh 0.4g of potassium persulfate and dissolve it in 50ml of deionized water, pour it into a three-necked flask, and react in a water bath at a constant temperature for 2.5 hours while stirring;

[0036] After the reaction is completed, the temperature is lowered, washed, suction filtered, and dried to obtain surface polymerization-modified silica with an average particle diameter of 316.6 nm.

[0037] Particle size distribution analysis: d(0.1): 236.8nm, d(0.5): 288.7nm, d(0.9): 390.2nm; infrared spectrum analysis, ...

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Abstract

The invention belongs to the field of inorganic material preparation, and discloses silica with surface subjected to polymerization modification, and a preparation method thereof. According to the invention, water is adopted as a solvent, such that toxicity and danger of organic solvents are avoided. Acrylic acid is adopted as a modifying agent, potassium persulfate is adopted as an initiator, and a silica filter cake produced with a precipitation method and without drying is directly subjected to surface polymerization modification. Therefore, the surface property of the silica material is changed, and the dispersity of silica powder is improved. According to the invention, the silica powder with the surface subjected to polymerization modification is advantaged in uniform particle size distribution, small particle size, and good product dispersity. With the surface polymerization method, the surface of the powdery material is modified, and a good effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a surface polymerization-modified silicon dioxide and a preparation method thereof. Background technique [0002] Inorganic nanoparticle-filled polymer materials have both the advantages of organic materials and inorganic materials. Compared with micron-sized inorganic particle-filled polymer materials, nano-scale inorganic particles can have better performance under the condition of lower filling amount. The reinforcing effect can significantly improve the toughness, rigidity, strength and wear resistance of polymer composites. Therefore, it can be widely used in the fields of rubber, plastics, adhesives, coatings and functional materials. [0003] Nanoparticles have some special characteristics: large specific surface area, high surface energy, and thermodynamic metastable state. In order to reduce its surface energy, nanoparticles are p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/10C08F120/06C08F2/44C08K3/36C08F292/00
Inventor 金鑫赵松
Owner BEIJING UNIV OF CHEM TECH
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