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Preparation method for organically-modified nano-silica/nylon 66 composite material

A nano-silica, composite material technology, applied in the direction of dyeing low-molecular-weight organic compounds, fibrous fillers, etc., can solve the problems of limited performance improvement, poor dispersion of nano-silica, reduce agglomeration, improve dispersive effect

Inactive Publication Date: 2009-11-04
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many studies on nano-silica / nylon 66 composites, most of them focus on the method of mechanical blending. The dispersion of nano-silica in the matrix is ​​not good, and the performance improvement is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The first step: preparation of organically modified nano-silica

[0016] Add 40mL of ethyl orthosilicate, 80mL of absolute ethanol, and 12mL of distilled water into a 500mL three-neck flask, raise the temperature to 45°C, stir mechanically for 10min, add ammonia water 2.0mL, and hydrolyze for 6-8h. Then 1.2 mL of silane coupling agent γ-aminopropyltriethoxysilane was added, and the reaction was continued at 45° C. for 8 h. Then add 100mL of distilled water, remove ethanol and ammonia water under vacuum at 50°C, and obtain 100mL of γ-aminopropyltriethoxysilane organically modified nano-silica suspension, wherein γ-aminopropyltriethoxysilane The mass of organically modified nano silicon dioxide is 10g.

[0017] The second step: preparation of organically modified nano-silica / nylon 66 composites

[0018] Add the suspension of 100mL of γ-aminopropyltriethoxysilane organically modified nano-silica prepared above to 990g of nylon 66 salt, then add distilled water to 1430g t...

Embodiment 2

[0020] The first step: preparation of organically modified nano-silica

[0021] Add 80 mL of tetraethyl orthosilicate, 160 mL of absolute ethanol, and 24 mL of distilled water into a 500 mL three-necked flask, raise the temperature to 50°C, stir mechanically, add 4.0 mL of ammonia water after 5 min, and hydrolyze for 8 h. Then 2.4 mL of silane coupling agent γ-(2,3-glycidoxy)propyltrimethoxysilane was added, and the reaction was continued at 50° C. for 8 h. Then add 200mL of distilled water, and remove ethanol under vacuum at 65°C to obtain a suspension of 200mL of γ-(2,3-epoxypropoxy)propyltrimethoxysilane organically modified nano-silica, wherein γ-(2 , 3-glycidoxy) propyltrimethoxysilane organically modified nano-silica quality is 20g.

[0022] The second step: preparation of organically modified nano-silica / nylon 66 composites

[0023] Add the suspension of 200mL of γ-(2,3-glycidyloxy)propyltrimethoxysilane organically modified nano-silica prepared above to 980g of nylon...

Embodiment 3

[0025] The first step: preparation of organically modified nano-silica

[0026] Add 120 mL of tetraethyl orthosilicate, 240 mL of absolute ethanol, and 36 mL of distilled water into a 1000 mL three-neck flask, raise the temperature to 55°C, stir mechanically, add 6.0 mL of ammonia water after 5 minutes, and hydrolyze for 8 hours. Then 3.6 mL of silane coupling agent γ-aminopropyltriethoxysilane was added, and the reaction was continued at 55° C. for 8 h. Then add 300mL of distilled water, vacuumize at 65°C to remove ethanol, and obtain 300mL of γ-aminopropyltriethoxysilane organically modified nano-silica suspension, in which γ-aminopropyltriethoxysilane is organically modified The mass of nanometer silicon dioxide is 30g.

[0027] The second step: preparation of organically modified nano-silica / nylon 66 composites

[0028] Add the suspension of 300mL of γ-aminopropyltriethoxysilane organically modified nano-silica prepared above to 960g of nylon 66 salt, and then add distil...

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PUM

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Abstract

The invention discloses an organically-modified nano-silica / nylon 66 composite material and a preparation method thereof. The method has the following advantages that: 1) the surface of nano-silica subjected to chemical modification has an epoxy group, an amino-group and other groups, the nano-silica can react with binary acid to form a chemical bond which is subjected to ultrasonic dispersion so as to reduce the agglomeration phenomenon of nano-silica particles, improve the dispersibility of the nano-silica and further obtain the composite material with good dispersibility; and 2) in the preparation process, a GSH-2 type high-pressure autoclave is adopted to prepare the composite material by in-situ polymerization, and the method has certain directive significance on industrialized production of the composite material.

Description

technical field [0001] The invention belongs to the technical field of polymer nano composite materials, and in particular relates to a preparation method of organically modified nano silicon dioxide / nylon 66 composite materials. Background technique [0002] Due to the surface effect, volume effect, and quantum size effect of nanoparticles, coupled with the excellent properties of polymers such as low density, high strength, corrosion resistance, and easy processing, nanomaterials have attracted widespread attention at home and abroad in recent years, and have become a major part of materials science. Research focus and hotspots. Nylon 66 belongs to AABB type nylon. AABB type nylon has the characteristics of high mechanical strength and high rigidity. It is the main variety of engineering plastics. Electrical packaging materials, etc. However, AABB nylon also has disadvantages such as poor low temperature and dry impact strength, high water absorption, and low notched imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F2/44C09C1/28C09C3/08
Inventor 张平陈广兵姜勇赵才贤丁燕怀蔡远利
Owner XIANGTAN UNIV
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