Silica filler, surface treatment method of silica filler and epoxy resin composite material

A technology of silica and epoxy resin, applied in the field of silica filler and its surface treatment, and epoxy resin composite materials, can solve the problem of reducing the processability and operability of epoxy resin, increasing the viscosity of epoxy resin, Particles are prone to agglomeration and other problems, so as to improve compatibility and interfacial bonding force, reduce viscosity and thermal expansion coefficient, and reduce thermal expansion coefficient

Active Publication Date: 2016-03-30
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high specific surface area of ​​silica and the large number of hydroxyl groups on its surface, the compatibility with the epoxy resin substrate is poor, and the particles are easily agglomerated, resulting in a sharp increase in the viscosity of the epoxy resin. , which reduces the processability and handling of epoxy resins

Method used

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  • Silica filler, surface treatment method of silica filler and epoxy resin composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The surface treatment method of silica filler of present embodiment, comprises the steps:

[0038] (1) Disperse 2 g of silicon dioxide particles in 400 ml of aqueous solution by ultrasonic to prepare a silicon dioxide dispersion;

[0039] (2) 0.2g relative molecular mass is 10000 polyvinyl alcohol is dissolved in the water of 100ml, the obtained mass concentration is the polyvinyl alcohol aqueous solution of 2g / L;

[0040] (3) Mix the above-mentioned silicon dioxide dispersion liquid with polyvinyl alcohol aqueous solution, and the obtained mixed liquid is ultrasonically reacted at room temperature for 5 hours, separated and washed to obtain silicon dioxide filler.

[0041] The silica filler prepared in this example has a core-shell structure, wherein the inner core is silica particles, and the outer shell is a coating layer made of polyvinyl alcohol; wherein, the thickness of the coating layer is 5 nm.

[0042] The polyvinyl alcohol-coated silica nanoparticles prepare...

Embodiment 2

[0044] The surface treatment method of silica filler of present embodiment, comprises the steps:

[0045] (1) Disperse 5 g of silicon dioxide particles in 450 ml of aqueous solution by ultrasonic to prepare a silicon dioxide dispersion;

[0046] (2) 0.025g molecular weight is 70000 polyethyleneimine dissolved in the aqueous solution of 50ml, the obtained concentration is the polyethyleneimine aqueous solution of 0.5g / L;

[0047] (3) Mix the above silicon dioxide aqueous solution and polyethyleneimine aqueous solution, and the obtained mixed solution is ultrasonically reacted at room temperature for 2 hours, separated and washed to obtain the silicon dioxide filler.

[0048] The silica filler prepared in this example has a core-shell structure; wherein, the inner core is silica particles, and the outer shell is a coating layer composed of polyethyleneimine; the thickness of the coating layer is about 10 nm.

[0049] The polyethyleneimine-coated silica particles prepared in this ...

Embodiment 3

[0051] The surface treatment method of silica filler of present embodiment, comprises the steps:

[0052] (1) Disperse 5 g of silicon dioxide particles in 450 ml of aqueous solution by ultrasonic to prepare a silicon dioxide dispersion;

[0053] (2) 0.05g molecular weight is 70000 polyethyleneimine dissolved in the aqueous solution of 50ml, the obtained concentration is the polyethyleneimine aqueous solution of 1g / L;

[0054] (3) Mix the above-mentioned silicon dioxide dispersion liquid with polyethyleneimine aqueous solution, and the obtained mixed liquid is ultrasonically reacted at room temperature for 2 hours, separated and washed to obtain a silicon dioxide filler.

[0055] The silica filler prepared in this example has a core-shell structure; wherein, the inner core is silica particles, and the outer shell is a coating layer composed of polyethyleneimine; the thickness of the coating layer is about 20 nm.

[0056] The polyethyleneimine-coated silica particles prepared i...

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Abstract

The invention relates to silica filler. The silica filler has a core-shell structure, wherein an inner core is silica and an outer shell is a coating layer formed by polymers. The silica filler provided by the invention is characterized in that the surface of silica is coated with the coating layer formed by the polymers, and the coating layer can improve the compatibility and the interface bonding force of the silica filler with epoxy resin, so as to reduce the viscosity and coefficient of thermal expansion of an epoxy resin composite material.

Description

technical field [0001] The invention relates to a silica filler and a surface treatment method thereof. The invention also relates to an epoxy resin composite material containing a surface-treated silica filler; the invention belongs to the field of material surface modification and polymer composite materials . Background technique [0002] Due to its excellent adhesion, chemical resistance, electrical insulation, low shrinkage, easy processing and low cost, epoxy resin is widely used in adhesives, coatings, construction, aerospace, electronic packaging and other fields. . However, due to the high crosslinking density of pure epoxy resin after curing, there are disadvantages such as brittleness, large internal stress, and high thermal expansion coefficient, which limit its further application. Due to its high rigidity, modulus and low thermal expansion coefficient, silica material is widely used as a filler added to epoxy resin to improve the mechanical properties of epox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/36C08L63/00
CPCC08K3/36C08K9/04C08K9/10C08L63/00
Inventor 孙蓉郭倩朱朋莉赵涛李刚
Owner SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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