A kind of preparation method of redispersible fluoropolymer latex powder

A polymer latex and redispersion technology, applied in the production of bulk chemicals, etc., can solve the problems of difficulty in controlling the molecular weight and molecular structure of latex powder, poor water and oil repellency on the surface of the modified coating film, and failure to meet practical applications. Excellent dispersion stability, excellent chemical resistance and water and oil repellency, effect of small van der Waals radius

Active Publication Date: 2022-02-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The common redispersible polymer latex powder in the market is obtained by emulsion polymerization of monomers such as vinyl acetate or acrylate, and then spray-dried at high temperature. The process is complicated, the atomization technology is high, and the production energy consumption is large
Moreover, the molecular weight and molecular structure of latex powder prepared by ordinary free radical polymerization are difficult to control
In addition, the weather resistance of the currently disclosed redispersible latex powder and the surface water and oil repellency of the modified coating film are relatively poor, which cannot meet practical applications.

Method used

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  • A kind of preparation method of redispersible fluoropolymer latex powder
  • A kind of preparation method of redispersible fluoropolymer latex powder

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of fluorine-containing macromolecular chain transfer agent with hydrophilic groups: In a 500ml single-mouth bottle, add 3.00 g of hydrophilic oligomer polyethylene glycol monomethyl ether 1000 (mPEG1000), 2.27 g of small molecule chain transfer agent S- 1-dodecyl-S'-(α,α'-dimethyl-α"-propionic acid) trithioester, 7.6×10 -2 g dehydrating agent dicyclohexylcarbodiimide, 4.5×10 -2 g catalyst 4-dimethylaminopyridine, 40 mL solvent dichloromethane, reacted for 48 h under nitrogen protection. After the reaction, it was filtered by suction, concentrated, precipitated with anhydrous ether, and dried in a vacuum oven at 30°C. The obtained light yellow solid product was the macromolecular chain transfer agent mPEG 1000 -CTAs.

[0030] Take 0.175 g macromolecular chain transfer agent mPEG successively 1000 -CTA, 2.00 g dodecafluoroheptyl methacrylate monomer, 7.8×10 -3 Add g initiator azobisisobutyronitrile and 8.00 g solvent tetrahydrofuran into a 50ml single-n...

Embodiment 2

[0032] Preparation of fluorine-containing macromolecular chain transfer agent with hydrophilic groups: In a 500ml single-mouth bottle, add 5.00 g of hydrophilic oligomer polyethylene glycol monomethyl ether 2000 (mPEG2000), 2.27 g of small molecule chain transfer agent S- 1-dodecyl-S'-(α,α'-dimethyl-α"-propionic acid) trithioester, 7.6×10 -2 g dehydrating agent dicyclohexylcarbodiimide, 4.5×10 -2 g catalyst 4-dimethylaminopyridine, 40 mL solvent dichloromethane, reacted for 48 h under nitrogen protection. After the reaction was completed, it was filtered by suction, concentrated, precipitated with anhydrous ether, and dried in a vacuum oven at 30°C. The obtained light yellow powder product was the macromolecular chain transfer agent mPEG 2000 -CTAs.

[0033] Take 0.305 g macromolecular chain transfer agent mPEG successively 2000 -CTA, 2.00 g of dodecafluoroheptyl methacrylate monomer, 7.8×10-3 g of initiator azobisisobutyronitrile and 8.00 g of solvent tetrahydrofuran wer...

Embodiment 3

[0035] Preparation of fluorine-containing macromolecular chain transfer agent with hydrophilic groups: In a 500ml single-mouth bottle, add 12.00 g of hydrophilic oligomer polyethylene glycol monomethyl ether 5000 (mPEG5000), 2.27 g of small molecule chain transfer agent S- 1-dodecyl-S'-(α,α'-dimethyl-α"-propionic acid) trithioester, 7.6×10 -2 g dehydrating agent dicyclohexylcarbodiimide, 4.5×10 -2g catalyst 4-dimethylaminopyridine, 40.00 mL solvent dichloromethane, reacted for 48 h under nitrogen protection. After the reaction, it was filtered by suction, concentrated, precipitated with anhydrous ether, and dried in a vacuum oven at 30 °C to obtain a light yellow powder product, the macromolecular chain transfer agent mPEG 5000 -CTAs.

[0036] Take 0.795 g macromolecular chain transfer agent mPEG successively 5000 -CTA, 2.50 g of dodecafluoroheptyl methacrylate monomer, 7.8×10-3 g of initiator azobisisobutyronitrile and 8.00 g of solvent tetrahydrofuran were added to a 50m...

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Abstract

The invention relates to a preparation method of redispersible fluorine-containing polymer latex powder, belonging to the field of polymer material preparation. The preparation method is realized through the following steps: using a fluorine-containing macromolecule containing a hydrophilic group as a chain transfer agent, polymerizing a monomer, a fluorine-containing macromolecular chain transfer agent containing a hydrophilic group, an initiator, and a solvent, and the reaction is completed Afterwards, the carbon dioxide is vaporized and recovered to obtain powdered redispersible fluorine-containing polymer latex powder; the solvent is liquid or supercritical carbon dioxide. The controllable polymerization technology is adopted, the operation is simple, the reaction conditions are mild, and the molecular weight and molecular structure of the obtained polymer are controllable, which endows the redispersible latex powder with more excellent performance and dispersion stability.

Description

technical field [0001] The invention relates to a preparation method of redispersible fluorine-containing polymer latex powder, belonging to the field of polymer material preparation. Background technique [0002] Redispersible polymer latex powder is a powdery functional resin obtained by spray drying special latex prepared by emulsion polymerization. It is widely used in modified cement mortar, modified concrete, construction adhesives, architectural coatings and powder coatings, etc. . Compared with conventional polymer emulsions, redispersible polymer latex powder has the advantages of easy storage, long-distance transportation, and premixing with dry cement, which can greatly improve on-site construction efficiency, and can also be directly used as raw materials for coatings. It only needs to add water according to a certain proportion and stir evenly, the construction is simple, and the packaging and transportation are convenient, the cost is low, and it is green and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F220/24C08F220/14C08F220/18C08F2/38
CPCC08F293/005C08F220/24C08F220/14C08F220/18C08F2/38C08F2438/03Y02P20/54
Inventor 徐安厚李文薇霍志远王瑞雪李辉张书香
Owner UNIV OF JINAN
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