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Low-foam soap-free organic fluorine emulsion and preparation method thereof

A technology of organic fluorine and emulsion, applied in the field of chemical industry, can solve the problems of latex film being easily corroded, air bubbles and pinholes, uneven latex film, etc., to avoid latex film defects, overcome hot stickiness, cold brittleness, high effect

Active Publication Date: 2012-11-07
GUANGZHOU HUADU HAUYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, too much emulsifier will generate a lot of foam, which will make construction difficult, and the formed latex film will be uneven, with air bubbles and pinholes
At the same time, when the latex film is formed, the free emulsifier migrates to the surface of the film, which offsets the barrier performance of the fluorine segment. When it is eroded by rainwater and corrosive liquids, the emulsifier will be destroyed first, forming grooves and small holes on the film surface. Pores reduce the continuity and durability of the latex film and make the latex film easy to be corroded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 150g of methyl ethyl ketone into a 1L reaction kettle, raise the temperature to 80°C, add 2g of azobisisobutyronitrile, stir at constant temperature for 10 minutes, and dropwise add a mixture consisting of 20g of behenyl methacrylate and 180g of methacrylic acid. body, dripped in 5 hours; reacted at 80°C for 6 hours, distilled off butanone under reduced pressure, and stopped the reaction. After the temperature of the reactor dropped to room temperature, 209.3g of ammonia water was added (the mass concentration was 35%, the same below, the moles of ammonia water The amount is 209.3×0.35 / 35=2.09mol) and neutralized for 2 hours, and the emulsifier S-1 is obtained after discharging.

Embodiment 2

[0036] Add 100g of butanone into a 1L reaction kettle, raise the temperature to 85°C, add 1g of azobisisobutyronitrile, stir at constant temperature for 15 minutes, and dropwise add a mixed monomer consisting of 100g of n-octyl methacrylate and 100g of maleic acid , dripped in 3 hours; kept at 85°C for 8 hours, distilled off butanone under reduced pressure and stopped the reaction. After the temperature of the reaction kettle dropped to room temperature, 86g of ammonia water was added for neutralization for 1 hour, and the emulsifier S-2 was obtained after discharge.

Embodiment 3

[0038]Add 180g of butanone into a 1L reaction kettle, raise the temperature to 83°C, add 1.4g of azobisisobutyronitrile, stir at constant temperature for 12 minutes, and dropwise add a mixture consisting of 100g of n-octyl methacrylate and 100g of itaconic acid. After 4 hours of dripping; keep warm at 83°C for 7 hours, stop the reaction after removing butanone by distillation under reduced pressure, add 76.9g of ammonia water to neutralize for 1 hour after the temperature of the reaction kettle drops to room temperature, and discharge to obtain emulsifier S-3 .

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Abstract

The invention belongs to the fields of chemistry and chemical engineering, and discloses low-foam soap-free organic fluorine emulsion and a preparation method thereof. The low-foam soap-free organic fluorine emulsion is synthesized by performing emulsion polymerization on water-soluble polymer and a comonomer, wherein the water-soluble polymer is obtained by performing copolymerization reaction on a hydrophobic alkene monomer with a crystalline side chain and a water-soluble alkene monomer containing a neutralizable group or an ion group and is taken as an emulsifier. The water-soluble polymer emulsifier is self-made, and the composition of main body polymer is adjusted, so that the low-foam soap-free organic fluorine emulsion which does not contain a micromolecular free emulsifier, is low in foaming performance, can be subjected to film formation at room temperature and has a non-sticky surface is prepared.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and relates to a low-foaming, soap-free organic fluorine emulsion and a preparation method thereof. Background technique [0002] Due to the unique surface properties of fluorine atoms, fluorine-containing emulsions have been widely used in the surface protection of cement, stone, fabrics, metals, etc. In the current preparation of fluorine-containing emulsion, it is mainly obtained by emulsion polymerization, under the action of surfactant, dispersing the water-insoluble reactive monomer into water for polymerization reaction. Since fluorine-containing monomers are more hydrophobic and dense than ordinary acrylate monomers, in order to obtain emulsions with satisfactory stability, a large amount of emulsifiers must be used. In actual use, too much emulsifier will produce a lot of foam, which will lead to difficulty in construction, and the formed latex film will be uneven, with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/24C08F220/18C08F220/14C08F220/06C08F220/22C08F2/24C08F222/02C08F220/58C08F220/34C08F220/60C08F220/56
Inventor 李文
Owner GUANGZHOU HUADU HAUYU CHEM
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