Recycling surface modification method for aluminum oxide powder high in water dispersion stability

A technology of alumina powder and dispersion stability, applied in the field of materials, can solve the problems of complicated, difficult and low efficiency of powder surface modification process, and achieve controllable surface coverage and surface modification effect, preventing Effects of condensation reactions

Active Publication Date: 2017-04-26
溧阳极盾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, for relatively simple systems, a higher grafting rate is required; while for more complex systems, it is necessary to select a suitable matching polymer, and an appropriate grafting rate and degree of polymerization are required to adapt to the system. Therefore, the stable growth of the polymer is often achieved by controlling a series of process parameters, so that most of the surface grafting process has problems such as complicated process flow, long processing cycle and low efficiency.
At the same time, almost all powder modification methods involve the use of modifiers and organic solvents, but most of the residual modifiers and organic solvents in the reaction process cannot be effectively recycled, so there is an environmental pollution problem
[0005] To sum up, although the currently reported powder surface modification technologies have their own characteristics, basically there are complex powder surface modification processes, long treatment cycles, low efficiency, and grafting or coating ratios. Problems such as difficult control make the compatibility between the modified powder and the medium and the uniform dispersion stability in the medium unsatisfactory, and most of the modification methods have environmental pollution

Method used

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  • Recycling surface modification method for aluminum oxide powder high in water dispersion stability
  • Recycling surface modification method for aluminum oxide powder high in water dispersion stability
  • Recycling surface modification method for aluminum oxide powder high in water dispersion stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First dissolve methyl polyethylene glycol formate (n=10) in toluene, then add 3-aminopropyltriethoxysilane, the molar ratio of the two is 1:3. Nitrogen, 80 ℃ reaction 10h. The solvent toluene is separated and recovered by distillation under reduced pressure, and the precipitating agent acetone is added to the mixed solution to obtain composite modifier 1. The remaining liquid is distilled and separated to recover the precipitating agent acetone and excess 3-aminopropyltriethoxysilane. Dissolve 1g of composite modifier 1 in absolute ethanol, then add 10g of alumina powder and a small amount of acetic acid, and stir and react at 55°C for 24h. Separation by suction filtration to obtain modified oxygen oxide powder (sample 1, coverage rate 1.51%). The residual liquid is distilled and separated to recover the solvent ethanol, and the residual liquid is the excess composite modifier. The separated and recovered solvent toluene, ethanol, precipitant acetone, excess 3-aminopr...

Embodiment 2

[0056] Dissolve methyl polyethylene glycol formate (n=10) in tetrahydrofuran first, then add bis(trimethoxysilylpropyl)amine, the molar ratio of the two is 1:2. Nitrogen, 80 ° C reaction for 12h. The solvent tetrahydrofuran is separated and recovered by distillation under reduced pressure, and the precipitating agent cyclohexanol is added to the mixed solution to obtain the composite modifier 2. amine. Dissolve 1g of composite modifier 2 in toluene, then add 10g of alumina powder and a small amount of acetic acid, and stir and react at 55°C for 30h. Separation by suction filtration to obtain modified oxygen oxide powder (sample 2, coverage rate 1.75%). The residual liquid is distilled under reduced pressure to separate and recover the solvent toluene, and the residual liquid is the excess composite modifier. The separated and recovered solvent tetrahydrofuran, toluene, precipitant cyclohexanol, excess bis(trimethoxysilylpropyl)amine and excess composite modifier 2 can all b...

Embodiment 3

[0058] Dissolve polyethylene glycol (n=50) in toluene, and then add ethyltriethoxysilane cyanate, the molar ratio of the two is 1:3. Nitrogen was passed, and the reaction was carried out at 50°C for 24h. The solvent toluene is separated and recovered by distillation under reduced pressure, and the precipitating agent cyclohexane is added to the mixed solution to obtain the compound modifier 3. The remaining liquid is distilled under reduced pressure, separated and recovered, the precipitating agent cyclohexane and excess ethyltriethoxysilane cyanate . Dissolve 1g of composite modifier 3 in tetrahydrofuran, then add 10g of alumina powder, and stir and react at 50°C for 20h. Separation by suction filtration to obtain modified oxygen powder (sample 3, coating rate 2.35%). The residual liquid is distilled and separated to recover the solvent tetrahydrofuran, and the residual liquid is the excess compound modifier. The separated and recovered solvent toluene, tetrahydrofuran, pr...

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Abstract

The invention belongs to the technical field of materials and discloses a recycling surface modification method for aluminum oxide powder high in water dispersion stability. According to the method, compound modifier generation reaction and grafting reaction of aluminum oxide powder are both carried out in organic solvents, condensation reaction of a silane coupling agent is effectively prevented, aluminum oxide surface modified molecular layers are more regular, and accordingly surface coating rate and surface modification effects of the aluminum oxide powder are controllable; aiming at waterborne media different in property, favorable compatibility and dispersion stability of the modified aluminum oxide powder in water or waterborne media can be achieved through compound modifier molecular design; appropriate solvents are selected to realize recovery and recycling of residual compound modifier, reactants and solvents, and material closed cycle, cleanness and environment friendliness (namely freeness of waste liquid generation and discharge) in a whole surface modification process are realized.

Description

technical field [0001] The invention relates to a method for surface modification of alumina powder with high water dispersion stability and belongs to the field of material technology. Background technique [0002] Alumina ultrafine powder not only has the unique properties shared by ultrafine powders, such as special electrical, magnetic and optical properties, but also has excellent properties such as high hardness, wear resistance and high temperature resistance, so it is widely used in semiconductors, ceramics , Abrasives and optical materials and other high-tech fields. However, due to the large specific surface area and surface energy of the alumina ultrafine powder, the surface is charged, and the surface groups are abundant, the agglomeration between the particles is very serious, so that it often disperses unevenly or occurs under the medium. The sinking phenomenon will affect the dispersion stability and use effect of the suspension. Therefore, improving the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40C09C3/12
CPCC01P2006/22C01P2006/90C09C1/407C09C3/12
Inventor 朱振中王倩兰
Owner 溧阳极盾新材料科技有限公司
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