A kind of emulsion for water-borne expansion type fireproof coating and preparation method thereof

A kind of technology of fireproof coating and expansion type, which is applied in the direction of fireproof coating, etc., can solve the problems of poor compactness, affecting the flame-retardant effect of coating, and less research on the influence of fireproof coating, so as to achieve the effect of improving durability

Inactive Publication Date: 2016-03-02
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 fire retardant coatings.
Most water-based intumescent fire retardant coating emulsions mainly have elastic flow at high temperature, which makes the carbonized layer formed when the fire retardant coating burns have shortcomings such as low expansion height and poor compactness, which affects the flame retardant effect of the coating.

Method used

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  • A kind of emulsion for water-borne expansion type fireproof coating and preparation method thereof
  • A kind of emulsion for water-borne expansion type fireproof coating and preparation method thereof
  • A kind of emulsion for water-borne expansion type fireproof coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The mass fraction of raw materials consists of:

[0034]

[0035] (1) Add sodium lauryl sulfate, octylphenol polyoxyethylene ether, sodium bicarbonate, sodium bisulfite and deionized water into a reactor equipped with an electric stirring paddle, a thermometer, and a condenser tube, and stir. After the temperature rises to 70°C, add 10% vinyl acetate and vinyl tert-carbonate mixed monomers dropwise, and at the same time add dropwise an aqueous potassium persulfate solution with a concentration of 0.01g / mL accounting for 25% of the total amount of potassium persulfate. After turning blue, keep warm until there is no monomer reflux in the condensation tube (about 0.5h), and the seed emulsion is obtained;

[0036](2) To the seed emulsion obtained in step (1), add dropwise the remaining mixed monomers of vinyl acetate and vinyl tert-carbonate and peroxide with a concentration of 0.01g / mL, accounting for 60% of the total amount of potassium persulfate. Aqueous potassium ...

Embodiment 2

[0041] The mass fraction of raw materials consists of:

[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 an electric stirring paddle, a thermometer, and a condenser tube, and stir. After the temperature was raised to 75°C, a mixed monomer of acrylonitrile and 2-ethylhexyl acrylate was added dropwise, and at the same time, an aqueous potassium persulfate solution with a concentration of 0.01g / mL and 35% of the total amount of potassium persulfate was added dropwise. After the emulsion turns blue, keep it warm until there is no monomer reflux in the condensation tube, and then the seed emulsion is obtained;

[0045] (2) Simultaneously dropwise add the mixed monomer of vinyl acetate and vinyl tert-carbonate and the aqueous solution of potassium persulfate with a concentration of 0.01g / mL accounting for 60% of the total amoun...

Embodiment 3

[0050] The mass fraction of raw materials consists of:

[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 an electric stirring paddle, a thermometer, and a condenser tube, and stir. After the temperature rises to 75°C, add 15% of vinyl acetate and 2-ethylhexyl acrylate mixed monomers dropwise, and at the same time add dropwise persulfuric acid with a concentration of 0.01g / mL and 30% of the total amount of potassium persulfate Potassium aqueous solution, after the emulsion turns blue, keep warm until there is no monomer reflux in the condensation tube, and then the seed emulsion is obtained;

[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 persulfa...

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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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Patent Type & Authority Patents(China)
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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