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New method for improving vertical flow of expanding type methyl acrylate and vinyl acetate fire-retardant coating

A technology of fire retardant paint and vinyl acetate acrylic emulsion, applied in fire retardant paint, epoxy resin paint, coating and other directions, can solve the problems of sagging of coating film, unsuitable use, fire retardant paint falling off and so on

Inactive Publication Date: 2011-10-05
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the flame retardant liquid is highly corrosive, and it is not suitable for use in some occasions
However, the thermoplastic film-forming material is easy to flow when heated, causing the coating film to "sag", so that part or the whole of the fire-resistant coating falls off from the wood board, which greatly reduces the reliability of fire-proofing.

Method used

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  • New method for improving vertical flow of expanding type methyl acrylate and vinyl acetate fire-retardant coating
  • New method for improving vertical flow of expanding type methyl acrylate and vinyl acetate fire-retardant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use 10 grams of TA-3303 Acrylic Emulsion, 17.5 grams of ammonium polyphosphate, 6.9 grams of dicyandiamide, 6.9 grams of diammonium hydrogen phosphate, 6.4 grams of pentaerythritol, a total of 1 grams of dispersant and defoamer. After mixing and grinding, apply on a 4 mm thick wooden board. The coating film expands rapidly after being exposed to fire, and the phenomenon of "sagging" occurs after 14 minutes of burning. The test is stopped after taking off the board in about 21 minutes on average.

Embodiment 2

[0019] Use 7.5 grams of TA-3303 Acrylic Emulsion, 17.5 grams of ammonium polyphosphate, 6.9 grams of dicyandiamide, 6.9 grams of diammonium hydrogen phosphate, 6.4 grams of pentaerythritol, a total of 1 grams of dispersant and defoamer, water-based epoxy emulsion and amine curing The total dose is 1.4 grams. After mixing and grinding, apply on a 4 mm thick wooden board. The coating film expands faster after being fired, and the expansion speed becomes slower after burning for 15 minutes. Slight peeling began to occur at 42 min.

Embodiment 3

[0021] Use 7.5 grams of TA-3303 Acrylic Emulsion, 17.5 grams of ammonium polyphosphate, 6.9 grams of dicyandiamide, 6.9 grams of diammonium hydrogen phosphate, 6.4 grams of pentaerythritol, a total of 1 grams of dispersant and defoamer, water-based epoxy emulsion and amine curing The total dose is 2.8 grams. After mixing and grinding, apply on a 4 mm thick wooden board. The coating film expands more uniformly after being exposed to fire, and the expansion speed is very slow after 20 minutes. There is no "sagging" phenomenon and no stripping.

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Abstract

In the invention belonging to the technical field of fire retardant coatings, waterborne epoxy emulsion as a flame retardant synergist is firstly added to a waterborne methyl acrylate and vinyl acetate fire-retardant coating. A waterborne expanding type fire-retardant coating is prepared by taking ammonium polyphosphate as an acid source, pentaerythrite as a carbon source and dicyandiamide and diammonium hydrogen phosphate as air sources and compounding thermosetting waterborne epoxy emulsion and thermoplastic methyl acrylate and vinyl acetate emulsion to form a film forming matter. When the additive amount of the waterborne epoxy emulsion is 6wt%, after a charcoal layer is fired for 60min, the entire strength of the charcoal layer is up to 231g / cm<2>, the expansion multiplying power is 37, and a wood board unexposed surface temperature is only 61 DEG C. In the entire firing process, any vertical flow phenomenon is not found, while a pure waterborne methyl acrylate and vinyl acetate fire-retardant coating is very easy to cause a vertical flow phenomenon during firing.

Description

Technical field [0001] The invention relates to a new method that can effectively improve the easy "sagging" of intumescent vinegar-acrylic fire retardant coatings during the burning process by adding thermosetting waterborne epoxy emulsion to pure acrylic fire retardant coatings, and belongs to the technical field of intumescent fire retardant coatings . technical background [0002] Wood is widely used in equipment packaging, home decoration, building materials and other fields because of its environmental protection, easy processing, good mechanical properties, environmental friendliness, and recyclability. But wood is flammable and easy to cause fire. Therefore, improving the fire resistance of wood is an important issue. Generally speaking, the methods to improve the fire-retardant ability of wood include (1), soak the wood in a mixed fire-retardant liquid such as phosphoric acid. This method can effectively increase the oxygen index of wood, delay the time for wood to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D131/04C09D163/00C09D5/18
Inventor 石璞刘跃军李福枝曾广胜袁志庆
Owner HUNAN UNIV OF TECH