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Intumescent flame retardant as well as preparation method and application thereof

A technology of intumescent flame retardant and expanded vermiculite, which is applied in coatings, fireproof coatings, etc., can solve the problems of mechanical properties, physical and chemical properties of paint films, poor compatibility between flame retardants and resins, and decreased water resistance of coatings. , to achieve stable storage, good corrosion resistance, and improved airtightness

Inactive Publication Date: 2020-05-15
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The compatibility between the flame retardant and the resin is poor, resulting in a decrease in the mechanical properties and physical and chemical properties of the paint film;
[0005] 2) Commonly used carbon-forming catalysts and char-forming agents such as ammonium polyphosphate and pentaerythritol have certain water absorption properties, resulting in a decrease in water resistance and poor corrosion resistance of the coating;
[0006] 3) Most of the flame retardants are additive low-molecular substances, which have poor thermal stability, are easy to ooze out and precipitate, and affect the fireproof performance

Method used

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  • Intumescent flame retardant as well as preparation method and application thereof
  • Intumescent flame retardant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] One, the preparation of diethyl hypophosphite:

[0051] Sodium diethyl hypophosphite was dissolved in deionized water to form an aqueous solution of sodium diethyl hypophosphite with a concentration of 4 wt%, and 10 wt% dilute sulfuric acid was added to adjust the pH of the solution to 3 to obtain a mixed solution;

[0052] Heat the mixed solution to 75°C, slowly drop in equivalent aluminum sulfate aqueous solution under stirring, after the dropwise addition is complete, keep the reaction for 30 minutes, finish the reaction, filter, wash the filter cake with deionized water, and then vacuum dry at 130°C. A white powder is obtained, which is aluminum diethyl hypophosphite.

[0053] 2. Preparation of composite flame retardants:

[0054] The char-forming catalyst, foaming agent, char-forming agent, and diethyl hypophosphite are compounded and mixed according to the mass ratio of 8:6:5:3 to obtain a composite flame retardant, which is set aside.

[0055] 3. Preparation of...

Embodiment 2

[0068] One, the preparation of diethyl hypophosphite:

[0069] Sodium diethyl hypophosphite was dissolved in deionized water to form an aqueous solution of sodium diethyl hypophosphite with a concentration of 4 wt%, and 10 wt% dilute sulfuric acid was added to adjust the pH of the solution to 3 to obtain a mixed solution;

[0070] Heat the mixed solution to 75°C, slowly drop in an equivalent amount of magnesium sulfate aqueous solution under stirring, after the dropwise addition is complete, keep the reaction for 30 minutes, finish the reaction, filter, wash the filter cake with deionized water, and then vacuum-dry it at 130°C. A white powder is obtained, which is magnesium diethyl hypophosphite.

[0071] 2. Preparation of composite flame retardants:

[0072] The char-forming catalyst, foaming agent, char-forming agent, and diethyl hypophosphite are compounded and mixed according to the mass ratio of 10:7:6:4 to obtain a composite flame retardant, which is set aside.

[0073...

Embodiment 3

[0086] One, the preparation of diethyl hypophosphite:

[0087] Sodium diethyl hypophosphite was dissolved in deionized water to form an aqueous solution of sodium diethyl hypophosphite with a concentration of 4 wt%, and 10 wt% dilute sulfuric acid was added to adjust the pH of the solution to 3 to obtain a mixed solution;

[0088] Heat the mixed solution to 80°C, slowly drop into an equivalent zinc sulfate aqueous solution under stirring, after the dropwise addition is complete, keep the reaction for 40 minutes, finish the reaction, filter, and vacuum dry the filter cake at 130°C after being washed with deionized water. A white powder is obtained, which is zinc diethyl hypophosphite.

[0089] 2. Preparation of composite flame retardants:

[0090] The char-forming catalyst, foaming agent, char-forming agent, and diethyl hypophosphite are compounded and mixed according to the mass ratio of 12:8:7:5 to obtain a composite flame retardant, which is set aside.

[0091] 3. Preparat...

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Abstract

The invention discloses an intumescent flame retardant as well as a preparation method and application thereof. The intumescent flame retardant is obtained by intercalating and modifying organic expanded vermiculite with a composite flame retardant; the composite flame retardant is prepared by compounding a charring catalyst, a foaming agent, a charring agent and diethyl hypophosphite; the organicexpanded vermiculite is obtained by firstly carrying out incomplete expansion calcination on vermiculite to obtain incomplete expanded vermiculite and then carrying out organic modification on the incomplete expanded vermiculite by adopting fatty acid or fatty acid salt. The intumescent flame retardant disclosed by the invention is good in compatibility with water-based resin; the intumescent flame retardant has good dispersity, hydrolysis resistance and migration resistance, the defects that a traditional flame retardant is poor in compatibility with a polymer, a paint film absorbs water easily and is poor in thermal stability are overcome, and the fireproof coating prepared from the intumescent flame retardant is good in fireproof and flame-retardant performance, high in adhesive force,high in hardness and good in coating water resistance and corrosion resistance.

Description

technical field [0001] The invention relates to an intumescent flame retardant, a preparation method thereof and an application thereof in an intumescent water-based fireproof coating, belonging to the technical field of fireproof coatings. Background technique [0002] Fire-resistant coatings are brushed on the surface of flammable materials, which can improve the fire resistance of materials, slow down the spread of flames, or prevent burning within a certain period of time. This type of coating is called fire-resistant coatings. Intumescent fire retardant coatings can be divided into two types: water-based and solvent-based. Water-based coatings use water as the main solvent or dispersion medium, while solvent-based coatings use organic solvents as the dispersion medium. Solvent-based coatings volatilize organic matter during construction, which seriously endangers the environment and people's health. Compared with solvent-based coatings, water-based coatings have better...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K13/06C08K9/04C08K7/26C08K5/5313C08K5/053C08K5/06C09D5/18
CPCC08K5/053C08K5/06C08K5/5313C08K7/26C08K9/04C08K13/06C09D5/185
Inventor 李思为温绍国王继虎张继嘉陈亚博王光宇
Owner SHANGHAI UNIV OF ENG SCI
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