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Two-block low molecular polymer-grafted nano-silicon dioxide particles, preparation method and polyester

A nano-silica, low-molecular technology, applied in the field of linear polyester, can solve the problems of decreased polyester material strength, local stress concentration, poor uniformity, etc. The effect of improving dispersibility

Active Publication Date: 2016-11-09
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN201610111188.6 discloses a method for synthesizing block polymer-grafted nano-silica by a solution method. The uniformity of dispersion of silicon oxide in the polyester matrix becomes poor, and it is easy to form aggregates. These aggregates are called material defects, which cause local stress concentration when the force is applied, and reduce the strength of the polyester material.

Method used

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  • Two-block low molecular polymer-grafted nano-silicon dioxide particles, preparation method and polyester
  • Two-block low molecular polymer-grafted nano-silicon dioxide particles, preparation method and polyester

Examples

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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, the present invention discloses a method for grafting nano-silica with two-block low-molecular polymers, comprising the following steps:

[0026] Nano-silica modified with flexible polyether segments on the surface: first dissolve 3 grams of nano-silica in 25 ml of benzene, then react with 25 ml of thionyl chloride under nitrogen protection at 65 degrees Celsius for 4 hours. Chlorine atoms are introduced into the surface of silicon oxide to pre-activate the hydroxyl groups on the surface of nano silicon dioxide. Then 2 grams of pre-activated nano silicon dioxide was dissolved in 20 milliliters of toluene, and 20 milliliters of soft polyalcohol segment was added under magnetic stirring, and the surface soft polyol segment was obtained after reacting for 5 hours under nitrogen protection and 65 degrees Celsius. Modified nano-silica, in which the hydroxyl group at the end of the soft polyol segment dehydrates and condenses with the silicon hydro...

Embodiment 2

[0032] Such as figure 2 As shown, the present invention discloses a method for grafting nano-silica with two-block low-molecular polymers, comprising the following steps:

[0033] Nano-silica modified with flexible polyether segments on the surface: Dissolve 5 grams of nano-silica in 30 ml of benzene, then react with 30 ml of thionyl chloride under nitrogen protection at 65 degrees Celsius for 4 hours, Chlorine atoms are introduced into the surface of silicon oxide to pre-activate the hydroxyl groups on the surface of nano silicon dioxide. Then 1 gram of preactivated nano-silica was dissolved in 15 milliliters of toluene, 25 milliliters of triethylene glycol was added under magnetic stirring, and the surface soft polyol was obtained after reacting for 4 hours under nitrogen protection and 65 degrees Celsius. Segment-modified nano-silica, during which the hydroxyl groups at the end of the soft polyol segment dehydrate and condense with the silicon hydroxyl groups on the surfa...

Embodiment 3

[0037] Experimental purpose and method: In order to study the influence of two-block low-molecular polymer grafted nano-silica particles on the crystallization kinetics of linear polyester crystallization, this example uses the two-block low-molecular polymer synthesized in Example 2 Grafted nano-silica was used as the experimental object to study its influence on the crystallization kinetics of linear polyester chips. Standard samples were made in the injection molding machine. The melting temperature in the blender is 290°C, and the mold temperature in the injection molding machine: 50°C for pure linear polyester, and changed to 40°C after adding the two-block low-molecular polymer grafted nano-silica synthesized in Example 2. A total of seven groups of samples of synthetic two-block low-molecular polymer grafted nano-silica 0%, 1.0%, 2.0%, 3.0%, 4.0%, 5%, and 6% were prepared for mechanical properties, thermal properties, flow Tests for denaturation, etc.

[0038] Experim...

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Abstract

The invention discloses two-block low molecular polymer-grafted nano-silicon dioxide particles, a preparation method and polyester. Overall design is conducted on nanoparticles and application requirements thereof, the surface of nano-silicon dioxide is modified, a short soft polyester chain segment is grafted to the surface of nano-silicon dioxide, a relatively-lengthened linear polyester low molecular chain with the certain rigidity is introduced, and then modified nano-silicon dioxide which has the advantages that the rigidity and softness combined polymer molecular chains with the proper length and different properties are grafted to the surface, the chemical structure is stable, and amphipathicity, chemical activity, dispersibility and organic compatibility are all significantly improved is obtained; modified nano-silicon dioxide has the very good compatibility with most resin matrixes and improves the mechanical property of linear polyester, the polyester chain segment can be crystallized and nucleated, and then an excellent nucleation inducing effect on the linear polyester resin matrixes is achieved.

Description

technical field [0001] The invention relates to the field of nanoparticle preparation, in particular to a two-block low-molecular polymer grafted nano-silica particle, a preparation method thereof, and a linear polyester added with the nano-silica particle. Background technique [0002] Nano silica has a wide range of applications in many fields, such as fibers, rubber, plastics, biotechnology, coatings, etc. In the fiber field, it can produce deodorizing, mildew-proof, bactericidal, anti-ultraviolet radiation and anti-static fabrics, which can be used to make antibacterial clothing and areas exposed to strong ultraviolet rays, which can meet the needs of medical treatment and national defense respectively; in the rubber field , because of its reinforcement and anti-pigment attenuation characteristics, it can produce colored rubber, thereby changing the single color of traditional rubber; in the field of plastics, because nano-SiO 2 The light transmittance is good and the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G83/00
CPCC08G63/916C08G83/001
Inventor 王瑶唐建国庄洪伟刘继宪黄林军焦吉庆王彦欣王薇
Owner QINGDAO UNIV
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