Modified epoxy resin for solvent-free fireproof coating and preparation method of modified epoxy resin

A technology of epoxy resin and fireproof coatings, which is applied in fireproof coatings, epoxy resin coatings, coatings, etc., can solve the problems of unseen polyhedral silsesquioxane research, achieve improved flame retardant efficiency, and make raw materials cheap and easy to use The effect of simple preparation method

Pending Publication Date: 2022-03-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polyhedral silsesquioxane is a kind of organic-inorganic hybrid macromolecular material, which consists of silicon-oxygen bonds to form an inorganic framework, and has various structures such as cage, trapezoid, and ring trapezoid, with adjustable organic groups at the top corners. , so that it has good compatibility in the polymer matrix, and the inorganic silicon-oxygen structure can endow the polymer with excellent thermal stability. So far, no polyhedral silsesquioxane has been used in epoxy resin for modified solvent-free fireproof coatings. research on resin

Method used

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  • Modified epoxy resin for solvent-free fireproof coating and preparation method of modified epoxy resin
  • Modified epoxy resin for solvent-free fireproof coating and preparation method of modified epoxy resin
  • Modified epoxy resin for solvent-free fireproof coating and preparation method of modified epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A modified epoxy resin for solvent-free fireproof coatings, the preparation method is: at room temperature, after mixing 2.5g heptaphenylsilsesquioxane trisilanol and 72.5g epoxy resin prepolymer NPEK-257, put Stir and disperse in the dispersing equipment for 120min until uniform, obtain the modified epoxy resin prepolymer; at room temperature, after mixing 2.5g heptaphenylsilsesquioxane trisilanol and 22.5g curing agent isophoronediamine, Put into the dispersing equipment and stir and disperse for 30 minutes until it is uniform to obtain a modified curing agent; at room temperature, put the modified epoxy resin prepolymer and modified curing agent obtained in the above steps into the dispersing equipment and stir for 15 minutes until uniform, Curing at room temperature for 8 hours and continuing curing at 80° C. for 30 minutes to obtain the modified epoxy resin for the solvent-free fireproof coating.

[0047] Test result: the limiting oxygen index is 24%. Cone calorim...

Embodiment 2

[0049] A modified epoxy resin for solvent-free fireproof coatings, the preparation method is: at room temperature, after mixing 5g of trapezoidal phenylsilsesquioxane and 25g of curing agent isophoronediamine, put it into a dispersion device and stir Disperse for 30 minutes until uniform to obtain a modified curing agent; at room temperature, put 75g of epoxy resin prepolymer NPEK-257 and the modified curing agent obtained in the above steps into a dispersion device and stir for 15 minutes until uniform, and cure at room temperature for 8 hours , continue curing at 80° C. for 30 minutes to obtain the modified epoxy resin cured product for the solvent-free fireproof coating.

[0050] Test result: the limiting oxygen index is 24.2%. Cone calorimeter combustion test results show that the peak heat release rate is 912kW / m 2 , when the test time is 525s, the total smoke release is 2622m 2 / m 2 , the mass loss rate is 96%.

Embodiment 3

[0052] A modified epoxy resin for solvent-free fireproof coatings, the preparation method is: at room temperature, 2g heptaphenylsilsesquioxane trisilanol, 2g trapezoidal phenylsilsesquioxane and 71g epoxy resin After the polymer NPEK-257 is mixed, put it into the dispersing equipment and stir and disperse for 120min until it is uniform to obtain the modified epoxy resin prepolymer; Phoronediamine was put into a dispersing device, stirred and dispersed for 30 minutes until uniform, cured at room temperature for 8 hours, and continued to be cured at 80° C. for 60 minutes to obtain the modified epoxy resin cured product for the solvent-free fireproof coating.

[0053] Test result: the limiting oxygen index is 23.9%. Cone calorimeter combustion test results show that the peak heat release rate is 878kW / m 2 , when the test time is 525s, the total smoke release is 2631m 2 / m 2 , The mass loss rate is 96%.

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Abstract

The invention relates to modified epoxy resin for a solvent-free fireproof coating and a preparation method of the modified epoxy resin, and belongs to the field of fireproof materials. According to the modified epoxy resin for the solvent-free fireproof coating, part of the polyhedral silsesquioxane modified epoxy resin prepolymer, the curing agent, the heptaphenyl polyhedral silsesquioxane trisilanol and the trapezoidal phenyl polyhedral silsesquioxane participate in a curing reaction, and intrinsic flame retardance is achieved. During combustion, cage and trapezoid structures of the polyhedral silsesquioxane can hinder movement of molecular chains, improve melt viscosity and hinder gas escape, and a silica skeleton can form a silicon dioxide protection layer on the surface of the epoxy resin, so that the epoxy resin is endowed with heat resistance, flame retardance, smoke suppression and the like. When the silicon-based flame retardant is used for an intumescent fire retardant coating represented by ammonium polyphosphate / dipentaerythritol / melamine, the silicon element can play a synergistic flame-retardant role with the phosphorus element and the nitrogen element, so that the flame-retardant efficiency is improved, and the flame-retardant and fire-resistant comprehensive performance of the fire retardant coating is improved.

Description

technical field [0001] The invention relates to a modified epoxy resin for a solvent-free fireproof coating and a preparation method thereof, belonging to the field of fireproof materials. Background technique [0002] According to different solvents, fire retardant coatings can be divided into three types: solvent-based, water-based and solvent-free. Solvent-based fire retardant coatings are the earliest type of fire retardant coatings used. The matrix resin and flame retardant additives are dispersed in organic solvents. During use, a large amount of VOC, poisonous and harmful, is gradually being eliminated; water-based fire retardant coatings use water as a dispersant, emulsion and water-based resin as film-forming substances, very low VOC, and less environmental pollution. Some problems, such as the emulsion contains some co-solvents with slow volatilization speed, the coating takes a long time to dry at room temperature, has poor water resistance and corrosion resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/18C09D7/65C08G59/56C08G59/40
CPCC09D163/00C09D5/18C09D7/65C08G59/56C08G59/4085C08L2201/02C08L83/04
Inventor 李定华盘雨凝杨荣杰张文超翟聪聪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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