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Epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer and preparation method for epoxy resin toughening agent

A technology of star-shaped polymer and cyclotriphosphazene is applied in the field of epoxy resin toughening agent. problem, to achieve the effect of good compatibility, improved toughness and low viscosity

Inactive Publication Date: 2015-09-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the existing star-shaped polymers toughen epoxy resins, they often lead to a decrease in other mechanical properties (such as tensile strength) and thermal properties of the material, or a decrease in processing properties

Method used

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  • Epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer and preparation method for epoxy resin toughening agent
  • Epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer and preparation method for epoxy resin toughening agent
  • Epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer and preparation method for epoxy resin toughening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 14.76 g of p-hydroxybenzaldehyde and 50 mL of tetrahydrofuran, and then add 20 mL of triethylamine (TEA) into a 250 mL dry three-necked flask equipped with a magnet, a thermometer, a constant pressure dropping funnel, and a condensing reflux device. After heating to 60°C, a solution of 6.95 g of hexachlorocyclotriphosphazene in tetrahydrofuran (40 mL) was added dropwise with stirring, and the reaction was refluxed for 8 hours while stirring. Hexa(p-aldehydephenoxy)cyclotriphosphazene was obtained after recrystallization from ethyl acetate.

[0024] Into a 250 mL three-necked flask, 4.31 g of hexa(p-formylphenoxy)cyclotriphosphazene, 30 mL of tetrahydrofuran, and 15 mL of methanol were sequentially added, and stirred evenly. Add 2g of sodium borohydride and react at 25°C for 14h. After the solvent was removed by rotary evaporation, it was washed with water and recrystallized twice in ethanol to obtain hexa(p-hydroxymethylphenoxy)cyclotriphosphazene.

[0025] Add 6....

Embodiment 2

[0033] Add 14.76 g of p-hydroxybenzaldehyde and 50 mL of tetrahydrofuran, and then add 20 mL of triethylamine (TEA) into a 250 mL dry three-necked flask equipped with a magnet, a thermometer, a constant pressure dropping funnel, and a condensing reflux device. After heating to 60°C, a solution of 6.95 g of hexachlorocyclotriphosphazene in tetrahydrofuran (40 mL) was added dropwise with stirring, and the reaction was refluxed for 8 hours while stirring. Hexa(p-aldehydephenoxy)cyclotriphosphazene was obtained after recrystallization from ethyl acetate.

[0034] Into a 250 mL three-necked flask, 4.31 g of hexa(p-formylphenoxy)cyclotriphosphazene, 30 mL of tetrahydrofuran, and 15 mL of methanol were sequentially added, and stirred evenly. Add 2g of sodium borohydride and react at 25°C for 14h. After the solvent was removed by rotary evaporation, it was washed with water and recrystallized twice in ethanol to obtain hexa(p-hydroxymethylphenoxy)cyclotriphosphazene.

[0035] Add 6....

Embodiment 3

[0038] Add 14.76 g of p-hydroxybenzaldehyde and 50 mL of tetrahydrofuran, and then add 20 mL of triethylamine (TEA) into a 250 mL dry three-necked flask equipped with a magnet, a thermometer, a constant pressure dropping funnel, and a condensing reflux device. After heating to 60°C, a solution of 6.95 g of hexachlorocyclotriphosphazene in tetrahydrofuran (40 mL) was added dropwise with stirring, and the reaction was refluxed for 8 hours while stirring. Hexa(p-aldehydephenoxy)cyclotriphosphazene was obtained after recrystallization from ethyl acetate.

[0039] Into a 250 mL three-necked flask, 4.31 g of hexa(p-formylphenoxy)cyclotriphosphazene, 30 mL of tetrahydrofuran, and 15 mL of methanol were sequentially added, and stirred evenly. Add 2g of sodium borohydride and react at 25°C for 14h. After the solvent was removed by rotary evaporation, it was washed with water and recrystallized twice in ethanol to obtain hexa(p-hydroxymethylphenoxy)cyclotriphosphazene.

[0040] Add 6....

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Abstract

The present invention provides an epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer and a preparation method for the epoxy resin toughening agent, and belongs to the technical field of epoxy resin modification. The preparation method for the toughening agent comprises the following steps of: step I, in the presence of an acid scavenger, generating a nucleophilic substitution reaction in an oargnic solvent by utilizing hexachlorocyclotriphosphazene and p-hydroxybenzaldehyde, and obtaining a solid after separation and drying; step II, in the presence of a reductant, reducing a solid aldehyde group obtained in the step I to a hydroxyl group; and step III, by taking the solid obtained in the step II as an initiator, initiating ring-opening polymerization of caprolactone and obtaining the toughening agent after separation and drying. The epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer provided by the present invention has significant toughening effect on epoxy resin and can significantly improve impact resistance of the epoxy resin without sacrificing other mechanical properties and thermal properties of the material, thereby facilitating industrialized production.

Description

technical field [0001] The invention relates to an epoxy resin toughening agent, in particular to an epoxy resin toughening agent based on cyclotriphosphazene six-arm star polymer. The present invention further relates to a preparation method of the epoxy resin toughening agent. The invention belongs to the technical field of epoxy resin modification. technical background [0002] Epoxy resin has good physical and chemical properties. It has excellent bonding strength to the surface of metal and non-metal materials, good dielectric properties, small shrinkage rate, good dimensional stability of products, high hardness and high flexibility. Good, stable to alkali and most solvents, so it is widely used in pouring, impregnation, lamination, adhesives, coatings and other fields. However, epoxy resin has a three-dimensional network structure after curing, high crosslinking density, large internal stress, hard and brittle texture, poor heat and humidity resistance, and low peel...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L67/04C08G63/685C08G63/78
Inventor 魏玮叶苇韬林明文杨玙斐张莹张博文张帅卢荣杰刘晓亚
Owner JIANGNAN UNIV
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