Modified SiO2/PVA (polyvinyl alcohol) film and preparation method thereof

A technology of PVA1798 and PVA1788, which is applied in the field of modified SiO2/PVA film and its preparation, can solve the problems that transparent PVA film cannot be prepared, the combination effect of particles and organic matter is not well improved, and the effect of particle surface modification is not obvious, etc. , to achieve the effect of improving the performance enhancement effect, improving the tensile strength and improving the thermal stability

Active Publication Date: 2013-10-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are heat treatment methods, alcohol esterification methods, etc.; although these methods are economical, convenient, and low in price, they are not effective for SiO 2 The particle surface modification effect is not very obvious, the agglomeration phenomenon is still very serious, SiO 2 The combination effect of particles and organic matter has not been improved very well, and a PVA film with good transparency cannot be prepared
[0004] The present invention first adopts a class of organic acids containing hydrolyzable silicon to treat the surface of SiO 2 Particles, so that the particles are first coated with a layer of acidic groups, an

Method used

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  • Modified SiO2/PVA (polyvinyl alcohol) film and preparation method thereof
  • Modified SiO2/PVA (polyvinyl alcohol) film and preparation method thereof
  • Modified SiO2/PVA (polyvinyl alcohol) film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Modified SiO 2 / PVA film

[0028] The film is modified by m parts of SiO by mass ratio 2 Particles and m to 100 parts of PVA are dissolved at the dissolution temperature, cooled and molded, or formed at a melting temperature, wherein 0

[0029] The polyether amine can be fatty amine polyoxyethylene ether, polyoxyethylene-polyoxypropylene monoamine or polyoxyethylene-polyoxypropylene diamine.

[0030] The modified SiO 2 Particles are a class of organic acids containing hydrolyzable silanol and SiO2 surface-SiOH reaction to make SiO 2 The surface contains acidic groups, and then grafts polyetheramine on the surface through the principle of acid-base reaction. It has both hydrophilic and lipophilic properties and can be evenly dispersed in the polymer. A type of SiO 2 Particles, the diameter of which is 12-100nm. According to modified SiO 2 Filling amount of particles in PVA, SiO 2 The ma...

Embodiment 2

[0040] Example 2: Modified SiO 2 / Preparation of PVA film

[0041] In parts by weight, weigh 0.5 parts of SiO with organic acid surface treatment 2 and 99.5 parts of PVA1750±50, placed in a 150ml Erlenmeyer flask, added distilled water to make an aqueous solution with a PVA concentration of 5%-10%, stirred magnetically for 30min, and ultrasonicated for 30min. Gradiently raise the temperature from room temperature to 90°C, keep stirring for 90 minutes, stop stirring, and cool to room temperature. Cast on a pre-made glass plate mold to form a film with a film thickness of 0.06-1mm; dry at room temperature for 3 days and demould, and dry at 60°C for 2 hours to obtain a film.

Embodiment 3

[0042] Example 3: Modified SiO 2 / Preparation of PVA film

[0043] Weigh 10 parts of AC1810 modified SiO by mass fraction 2 and 90 parts of PVA1750±50, placed in a 150ml Erlenmeyer flask, added distilled water to make an aqueous solution with a PVA concentration of 5%-10%, stirred magnetically for 30min, and ultrasonicated for 30min; repeat this process 3 times. Starting from room temperature, the temperature was gradually increased to 90 °C at a rate of 10 °C / min, stirred and kept for 90 min, stopped stirring, and cooled to room temperature. Cast on a pre-made glass plate mold to form a film with a film thickness of 0.06-1mm; dry at room temperature for 3 days and demould, and dry at 60°C for 2 hours to obtain a film.

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Abstract

The invention relates to a modified SiO2/PVA (polyvinyl alcohol) film and a preparation method thereof. The preparation method comprises the following steps: dissolving m parts by mass of modified SiO2 particles and (m-100) parts by mass of PVA at dissolution temperature, cooling and carrying out cast molding, or carrying out integral molding at melting temperature, wherein 0<m<=20, and the PVA adopts PVA1750, PVA1778, PVA1788 or PVA1798. The film can be prepared by a running process, extrusion blow-molding process or calendering process. The modified SiO2 preparation method is simple, the modified SiO2 particles can be uniformly dispersed in the PVA, and the ether oxygen bond and amino group in the polyetheramine molecular chain and the hydroxy group in the PVA can form a hydrogen bond, so that the prepared SiO2/PVA film has obviously higher stretching resistance, modulus and heat stability, and is especially suitable for preparing transparent PVA film products.

Description

technical field [0001] The present invention relates to inorganic / organic composite material, especially a kind of modified SiO 2 / PVA film and its preparation method. Background technique [0002] In recent years, inorganic SiO 2 The introduction of particles has rapidly improved the performance of organic / inorganic composite materials in all aspects, and the application fields have become increasingly broad. After decades of efforts by material scientists at home and abroad, in inorganic SiO 2 Breakthroughs have been made in the research, development and use of particle-reinforced polyvinyl alcohol (PVA) films. But due to SiO 2 The particle size is small, easy to agglomerate, and cannot be well dispersed in PVA, resulting in voids and other phenomena in the molded material, which seriously affects the comprehensive performance of the material. [0003] Current SiO 2 The most commonly used and traditional method for particle modification is the silane coupling agent m...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K9/06C08K9/04C08K3/36C08J5/18B29C39/02B29C49/04
Inventor 王雁冰程龙山李文静周晨光陈娜彭睿魏冲黄志雄
Owner WUHAN UNIV OF TECH
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