Emulsion for water-based intumescent fire-retardant coating and preparation method thereof

A fire retardant coating, intumescent technology, applied in the direction of fire retardant coatings, coatings, etc., can solve the problems of less research on fire retardant coatings, affecting the flame retardant effect of coatings, low swelling height, etc., achieving good storage stability and preparation technology. Ease of use, low melt viscosity effect

Inactive Publication Date: 2013-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the selection of emulsions for intumescent fire retardant coatings mainly considers its glass transition temperature, crosslinking property, whether it contains flame retardant elements, etc. There are few studies on the influence of the viscosity and rheological behavior of emulsions at high temperatures on fir

Method used

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  • Emulsion for water-based intumescent fire-retardant coating and preparation method thereof
  • Emulsion for water-based intumescent fire-retardant coating and preparation method thereof
  • Emulsion for water-based intumescent fire-retardant coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] The composition of the mass fraction of raw materials is:

[0034]

[0035] (1) Add sodium lauryl sulfate, octylphenol polyoxyethylene ether, sodium bicarbonate, sodium bisulfite and deionized water in a reactor equipped with electric stirring blade, thermometer and condenser, and stir, After the temperature is raised to 70°C, add 10% vinyl acetate and vinyl tertiary carbonate mixed monomers, and at the same time add a potassium persulfate aqueous solution with a concentration of 0.01 g / mL and 25% of the total potassium persulfate. After bluing, keep it warm until there is no monomer reflux in the condenser tube (about 0.5h) to obtain seed emulsion;

[0036] (2) To the seed emulsion obtained in step (1), add the remaining mixed monomers of vinyl acetate and vinyl tertiary carbonate and the concentration of 0.01g / mL, which accounts for 60% of the total potassium persulfate. The potassium sulfate aqueous solution was added dropwise within 2.5h;

[0037] (3) A...

Example Embodiment

[0040] Example 2

[0041] The composition of the mass fraction of raw materials is:

[0042]

[0043] The synthesis steps are:

[0044] (1) Add sodium lauryl sulfate, octylphenol polyoxyethylene ether, sodium bicarbonate, sodium bisulfite and deionized water into a reactor equipped with electric stirring blade, thermometer and condenser, and stir, After heating to 75°C, add dropwise a mixed monomer of acrylonitrile and 2-ethylhexyl acrylate, and at the same time dropwise add a potassium persulfate aqueous solution with a concentration of 0.01g / mL and accounting for 35% of the total potassium persulfate. After the emulsion turns blue, keep it warm until there is no monomer reflux in the condenser, and then the seed emulsion is obtained;

[0045] (2) At the same time, add the mixed monomer of vinyl acetate and vinyl tertiary carbonate and the potassium persulfate aqueous solution with a concentration of 0.01g / mL, accounting for 60% of the total potassium persulfate, and the dripping is...

Example Embodiment

[0049] Example 3

[0050] The composition of the mass fraction of raw materials is:

[0051]

[0052] The synthesis steps are:

[0053] (1) Add sodium lauryl sulfate, octylphenol polyoxyethylene ether, sodium bicarbonate, sodium bisulfite and deionized water into a reactor equipped with electric stirring blade, thermometer and condenser, and stir, After heating to 75°C, add 15% vinyl acetate and 2-ethylhexyl acrylate mixed monomer dropwise, while adding dropwise persulfuric acid with a concentration of 0.01g / mL, which accounts for 30% of the total potassium persulfate Potassium aqueous solution, after the emulsion turns blue, keep it warm until there is no monomer reflux in the condenser to obtain the seed emulsion;

[0054] (2) Add the remaining mixed monomer of vinyl acetate and 2-ethylhexyl acrylate and the concentration of 0.01g / mL to the seed emulsion obtained in step (1) at the same time, accounting for the total amount of potassium persulfate 65% potassium persulfate aqueous ...

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Abstract

The invention relates to an emulsion for a water-based intumescent fire-retardant coating and a preparation method thereof. The emulsion comprises the following raw materials: 40-46% of monomer, 0.08-1.5% of compound emulsifier, 0.18-0.25% of initiator, 0.2-0.4% of sodium bicarbonate, 0.02-0.03% of tert-butyl hydroperoxide, 0.015-0.025% of sodium formaldehyde sulfoxylate and the balance of deionized water; and the emulsion is prepared by a semi-continuous seed emulsion polymerization method. The obtained emulsion has good storage stability, the latex film softening temperature is lower than 100 DEG C, the melt viscosity is low (50-110Pa.s), the thermal stability is good, and the thermal decomposition interval is 286-590 DEG C and is matched with a major decomposition interval (270-620 DEG C) of a flame-retardant system; and the emulsion is suitable to be used as a base material of the water-based intumescent fire-retardant coating.

Description

technical field [0001] The invention relates to a method for preparing an emulsion, in particular to a method for preparing an emulsion that can be used for water-based swelling fireproof coatings. Background technique [0002] Water-based intumescent fire retardant coatings generally contain four basic components: (1) Base material - polymer emulsion, such as pure acrylic emulsion, styrene-acrylic emulsion, silicon-acrylic emulsion, vinegar-acrylic emulsion, vinegar tertiary emulsion, etc. (2) Intumescent flame retardant system, including ① dehydration charcoal catalyst, usually an inorganic acid or a substance that can decompose to generate acid at 100°C-250°C, such as ammonium polyphosphate, which can decompose to generate phosphoric acid; ② charring agent, usually carbon-containing High amount of polyhydroxy compounds, such as pentaerythritol, dipentaerythritol, etc.; ③ foaming agent, which can decompose and produce non-flammable gas in case of fire, such as melamine, di...

Claims

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Application Information

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IPC IPC(8): C08F218/08C08F218/00C08F220/06C08F220/44C08F220/18C08F2/30C08F2/26C09D131/04C09D5/18
Inventor 夏正斌邱珍珍
Owner SOUTH CHINA UNIV OF TECH
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