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A kind of preparation method of fluorine-containing pure acrylic emulsion

A pure acrylic emulsion and emulsifier technology, applied in the field of emulsion polymerization, can solve the problems of high gel rate and low monomer conversion rate, and achieve the effect of low gel rate, high monomer conversion rate and uniform particle size distribution

Active Publication Date: 2018-04-06
山东信慧智能产业园有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems of low monomer conversion rate and high gel rate during the polymerization of emulsions with high fluorine content, the present invention provides a preparation of fluorine-containing pure acrylic emulsion that improves monomer conversion rate and reduces gel rate. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The percentage content of each component of fluorine-containing pure acrylic emulsion is shown in Table 1:

[0048] Table 1 Percentage of each component

[0049] project

percentage(%)

water

80

soft monomer

6.67

hard monomer

13.33

functional monomer

0.6

Fluorinated monomer

1.0

Initiator

0.04

Emulsifier

0.08

Chelating agent

0.01

Terbutanthiol

0.01

Quinol

0.002

[0050] The preparation method is as follows:

[0051]1. Mixing section: Add water to adjust the concentration of soft and hard monomers to 30%, Tmax=50±5°C, holding time for 30 minutes, nitrogen gas, stirring speed at 200rpm,

[0052] 2. High-speed shear section: Tmax=50±5°C, holding time 30 minutes, stirring speed 900rpm,

[0053] 3. Reaction section: Tmax=80±5℃, holding time 320 minutes, stirring speed 200rpm,

[0054] 4. Termination section: add hydroquinone to terminate the reaction, add rem...

Embodiment 2

[0058] The percentage content of each component of fluorine-containing pure acrylic emulsion is shown in Table 2:

[0059] Table 2 Percentage of each component

[0060] project

percentage(%)

water

80

soft monomer

6.67

hard monomer

13.33

functional monomer

0.6

Fluorinated monomer

2.0

Initiator

0.04

Emulsifier

0.08

Chelating agent

0.01

Terbutanthiol

0.01

Quinol

0.002

[0061] See Example 1 for the preparation method.

[0062] The test result of the fluorine-containing pure acrylic emulsion prepared by the above steps is:

[0063] Monomer conversion rate: 99.0%; Gel rate 2.5%; Appearance: Blu-ray milky white liquid; Solid content: 23.8%; Average particle size 0.67μm; pH=4.1; Storage stability: No delamination or demulsification after 6 months of storage and precipitation phenomena.

Embodiment 3

[0065] The percentage content of each component of fluorine-containing pure acrylic emulsion is shown in Table 3:

[0066] Table 3 Percentage of each component

[0067] project

percentage(%)

water

80

soft monomer

6.67

hard monomer

13.33

functional monomer

0.6

Fluorinated monomer

1.0

Initiator

0.04

Emulsifier

0.16

Chelating agent

0.01

Terbutanthiol

0.01

Quinol

0.002

[0068] See Example 1 for the preparation method.

[0069] The test result of the fluorine-containing pure acrylic emulsion prepared by the above steps is:

[0070] Monomer conversion rate: 99.1%; gel rate 1.5%; appearance: blue light milky white liquid; solid content: 22.8%; average particle size 0.35μm; pH=4.2; storage stability: no delamination or demulsification after 6 months of storage and precipitation phenomena.

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Abstract

The invention relates to the field of technologies for polymerizing emulsion, in particular to a method for preparing fluorine-containing pure acrylic emulsion. The method includes mixing emulsifiers, hard monomers, soft monomers, functional monomers, fluorine-containing monomers, water-soluble thermal initiators, chelating agents and entanglement molecular weight regulators with one another to obtain mixtures and stirring the mixtures; shearing the mixtures at high stirring speeds of 800-1000 rpm; carrying out reaction; adding inhibitors into the mixtures and terminating the reaction. The method has the advantages that the water-soluble fluorine-containing pure acrylic emulsion is prepared by means of polymerizing emulsion free radical, technological reaction steps are simple, applied chemicals are clean and environmentally friendly, the method is high in monomer conversion rate and low in gel rate, and the fluorine-containing pure acrylic emulsion is uniform in particle size distribution and is in a stable state; the fluorine-containing pure acrylic emulsion can be used for gluing the surfaces of paper, so that the waterproof, oil-proof and surface strength performance and the like of the paper can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of emulsion polymerization, in particular to a preparation method of fluorine-containing pure acrylic emulsion. Background technique [0002] Pure acrylic emulsion has been widely used in architectural and industrial coatings, and is currently a relatively high-end water-based coating. Its polymerization mainly adopts the emulsion free radical polymerization method. The monomers used are mainly alkyl acrylates, which are divided into soft monomers and hard monomers. Because acrylic acid contains polar groups, it can play a role in stabilizing the emulsion during polymerization. It can help to crosslink to form a thermosetting coating, and it is mainly added as a functional monomer. [0003] Generally, functional monomers are also hard monomers, and the glass transition temperature (Tg) of hard monomers is relatively high. For example, the Tg of butyl methacrylate is 20°C, the Tg of vinyl acetate is 30°C, T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F220/18C08F218/08C08F220/28C08F220/06C08F220/22C08F2/26C08F2/30
CPCC08F2/26C08F2/30C08F218/08C08F220/14C08F220/18C08F220/1804C08F220/281C08F220/06C08F220/22
Inventor 吴朝军李建军张开福徐忠民李书平李荣刚于冬梅
Owner 山东信慧智能产业园有限公司
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