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A water-based smoke-suppressing expansion type fireproof coating based on modified hydrotalcite and its preparation method

A fire-resistant coating and modified water technology, which is applied in fire-resistant coatings, anti-fouling/underwater coatings, coatings, etc., can solve the problem of hydrotalcite flame-retardant performance, insufficient stability, insufficient anion exchange between layers, polymer materials Poor compatibility and other issues, to achieve excellent anti-fouling performance, not easy to break through flames, and good compatibility

Active Publication Date: 2021-03-30
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, hydrotalcite has problems such as flame retardancy, insufficient stability, and poor compatibility with polymer materials, so it is usually necessary to further intercalate the hydrotalcite.
For example, the patent CN201510788604.1 provides an organically modified hydrotalcite for flame retardancy and smoke suppression and its preparation method. Through interlayer anion exchange and organic intercalation modification, magnesium-aluminum-based nitrate hydrotalcite needs to be prepared in advance. The preferred double spirocyclic phosphorus compound has problems such as poor solubility, insufficient anion exchange between layers, low yield, and poor practicability.

Method used

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  • A water-based smoke-suppressing expansion type fireproof coating based on modified hydrotalcite and its preparation method
  • A water-based smoke-suppressing expansion type fireproof coating based on modified hydrotalcite and its preparation method

Examples

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preparation example Construction

[0036] In the following examples, the preparation method of the modified hydrotalcite comprises the steps:

[0037] 1) Add 5.94g of spirocyclopentaerythritol phosphorus oxychloride and 1.2g of sodium hydroxide into 50ml of deionized water, mix well, heat up to 80°C, adjust the pH to 9-10 with 10% sodium hydroxide solution, and the solution becomes clear , cooled to room temperature to obtain spiropentaerythritol sodium phosphate solution;

[0038] 2) Add 7.5g of aluminum nitrate nonahydrate and 10.25g of magnesium nitrate hexahydrate into 50ml of deionized water, and stir to dissolve;

[0039] 3) Mix the sodium phosphate solution in 1) and the solution containing aluminum and magnesium ions in 2) uniformly, stir at room temperature for 1 h; then transfer to a reaction kettle, react at 80°C for 16 h, cool, filter, wash, drying to obtain the modified hydrotalcite.

Embodiment 1

[0041] A water-based smoke-suppressing intumescent fireproof coating based on modified hydrotalcite. The components and their mass percentages are: 1% modified hydrotalcite, 36% ammonium polyphosphate, 12% pentaerythritol, 12% melamine, and water-based acrylic acid Emulsion 22%, hydroxyethyl cellulose 0.5%, dispersant 0.5%, defoamer 0.5%, n-octanol 0.5%, water 15%, its preparation method is:

[0042] Weigh the raw materials according to the mass percentage of the above components, grind the modified hydrotalcite, ammonium polyphosphate, pentaerythritol, and melamine into powder, then add water to fully grind and mix evenly; then add hydroxyethyl cellulose, defoamer and Dispersant, continue to grind thoroughly; finally add water-based acrylic acid emulsion and n-octanol, grind and mix well, and then prepare the water-based smoke-suppressing expansion type fireproof coating based on modified hydrotalcite.

Embodiment 2

[0044] A water-based smoke-suppressing expansion fireproof coating based on modified hydrotalcite, the components and their mass percentages are: 3% modified hydrotalcite, 36% ammonium polyphosphate, 12% pentaerythritol, 12% melamine, water-based acrylic acid Emulsion 22%, hydroxyethyl cellulose 0.5%, dispersant 0.5%, defoamer 0.5%, n-octanol 0.5%, water 13%, its preparation method is the same as embodiment 1.

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Abstract

The invention discloses waterborne smoke suppression and expansion type fireproof coating based on modified hydrotalcite and a preparation method thereof. The preparation method comprises the following steps: preparing a phosphonyl sodium solution by taking phosphonyl chloride compound and sodium hydroxide as raw materials; taking phosphonyl ions as intercalation anions; carrying out a hydrothermal method to synthesize the modified hydrotalcite in one step; then preparing the waterborne smoke suppression and expansion type fireproof coating based on preparing modified hydrotalcite by taking the modified hydrotalcite, a film forming matter, ammonium polyphosphate, pentaerythritol, melamine, hydroxyethyl cellulose, a de-foaming agent, a dispersant and water as raw materials. According to thefireproof coating disclosed by the invention, a formed expanded carbon layer is dense and firm and has efficient fireproof and flame-retarding and smoke suppression performance; the preparation method is simple; the fireproof coating has excellent film-forming performance, high strength, good decorativeness and waterborne environment protection and is suitable for being popularized and applied.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based smoke-suppressing expansion type fireproof coating based on modified hydrotalcite and a preparation method thereof. Background technique [0002] Water-based intumescent fireproof coatings are widely used in fire protection due to the advantages of thin coating thickness, convenient construction, good decoration, and water-based environmental protection. However, due to the thermal expansion and foaming process of intumescent fireproof coatings, a large amount of smoke will be generated, endangering people's life, health and safety, and destroying the ecological environment, which has been criticized by people. For example, the patent CN201410341750.5 provides a water-based ultra-thin intumescent fireproof coating for steel structures. Although the fireproof, anti-corrosion, adhesion, weather resistance and other basic properties of the fireproof coating have been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/18C09D133/00C09D7/61C09D7/62C09D7/63C09D7/65C09D5/16
CPCC08K2003/323C08L2201/02C08L2201/22C09D5/1687C09D5/185C09D133/00C09D7/61C09D7/62C09D7/63C09D7/65C08L1/284C08K13/06C08K9/02C08K3/26C08K3/32C08K5/053C08K5/34922
Inventor 刘治田胡清华刘诗张旗
Owner WUHAN INSTITUTE OF TECHNOLOGY
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