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Crosslinkable fluorine-containing macromolecular emulsifier, fluorine-containing emulsion containing the emulsifier, and preparation and application methods thereof

A macromolecular emulsifier and emulsion technology, which is applied in the field of polymer materials, can solve the problem of damaging the hydrophobicity of the coating, the degradation of the performance of fluoropolymers, affecting the hydrophobicity of the coating, anti-adhesion, hydrophobic stability and long-term performance to achieve excellent hydrophobic properties, high fluorine content, and eliminate the effect of hydrophilicity

Pending Publication Date: 2020-03-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the emulsifier uses strong hydrophilic quaternary ammonium salt groups. These hydrophilic quaternary ammonium salt groups will gradually migrate to the surface of the coating due to molecular diffusion during the use of the coating and accumulate in the coating. The hydrophilic groups on the surface will seriously affect the hydrophobicity, anti-adhesion, and hydrophobic stability and long-term performance of the coating. Long-term contact with water will even elute the fluoropolymer on the coating, resulting in further performance. Decrease, severely damage the hydrophobic properties of the coating

Method used

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  • Crosslinkable fluorine-containing macromolecular emulsifier, fluorine-containing emulsion containing the emulsifier, and preparation and application methods thereof
  • Crosslinkable fluorine-containing macromolecular emulsifier, fluorine-containing emulsion containing the emulsifier, and preparation and application methods thereof
  • Crosslinkable fluorine-containing macromolecular emulsifier, fluorine-containing emulsion containing the emulsifier, and preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Synthesis of fluorine-containing emulsion E1 based on macromolecular fluorine-containing emulsifier:

[0088] Add 100ml N, N dimethylacetamide (DMAC), perfluorooctyl ethyl acrylate 6g, methyl methacrylate 6g, acrylamide 8g, initiator benzoyl peroxide (BPO) 0.2g in the reactor , Dissolve and stir at room temperature for 30 minutes under nitrogen gas to remove oxygen in the system. Under the condition of reflux, the temperature was raised to 60° C. for polymerization, and the polymerization reaction was carried out. After 6 hours of reaction, heating was stopped, and air was introduced to terminate the reaction. After discharging, 300 g of perfluorooctyl ethyl acrylate, 300 g of methyl methacrylate, 50 g of the macromolecular fluorine-containing emulsifier solution prepared above, and 2000 ml of deionized water were pre-emulsified with a supersonic emulsifier at room temperature for 30 The emulsion was obtained in minutes, and the emulsion was placed in a four-necked fl...

Embodiment 2

[0093] Synthesis of fluorine-containing emulsion E2 based on macromolecular fluorine-containing emulsifier:

[0094] The synthesis process of E2 refers to Example 1, and the formula and process parameters are shown in Table 1 and Table 2 respectively.

[0095] E2 structure and performance characterization methods are the same as those in Example 1. The molecular weight, molecular weight distribution and fluorine content of E2 are shown in Table 3; the contact angle changes of the glass fiber non-woven membrane before and after being treated with E2 coating film are shown in Table 4.

Embodiment 3

[0097] Synthesis of fluorine-containing emulsion E3 based on macromolecular fluorine-containing emulsifier:

[0098] The synthesis process of E3 refers to Example 1, and the formula and process parameters are shown in Table 1 and Table 2 respectively.

[0099] The method for characterizing the structure and performance of E3 is the same as that of Example 1. The molecular weight, molecular weight distribution and fluorine content of E3 are shown in Table 3; the contact angle changes of the glass fiber non-woven membrane before and after being treated with E3 coating film are shown in Table 4.

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Abstract

The invention discloses a crosslinkable fluorine-containing macromolecular emulsifier, a fluorine-containing emulsion containing the emulsifier, and preparation and application methods thereof. The macromolecular emulsifier is prepared through solution copolymerization of a fluorine-containing vinyl monomer and a crosslinkable hydrophilic monomer in an organic solution, wherein the prepared polymer solution generates a saloid emulsifier under effect of a volatile acid, and finally a fluorine-containing monomer and a copolymerization monomer are emulsified to prepare the fluorine-containing emulsion. In the invention, the macromolecular emulsifier is produced through connection of a hydrophobic fluorine-containing side-chain and the hydrophilic group, wherein the macromolecular emulsifier has excellent emulsification effect on the fluorine-containing monomer, so that the prepared fluorine-containing emulsion is very stable. The fluorine-containing emulsion can be mixed, diluted and immersed in multi-polyurethane / epoxy and the surface of a to-be-treated object is coated with the emulsion in a manner of smearing and then high temperature drying; at high temperature, the saloid groupsin the emulsifier can form high-reaction activity carboxyl or amino groups, which are then reacted with isocyanate and epoxy group, thus converting the hydrophilic group into hydrophobic group. The emulsion has excellent waterproof performance and has great application prospect.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a crosslinkable fluorine-containing macromolecular emulsifier, a fluorine-containing emulsion containing the emulsifier, and methods for preparing and using the emulsifier. Background technique [0002] Fluorine atoms have properties such as strong electronegativity, low polarizability, weak van der Waals force and high bond energy (485.3kJ / mol) of C-F bonds, which make fluoropolymers have outstanding heat resistance, solvent resistance and unique properties. Low surface energy and other advantages, coating the surface of the material with fluoropolymer can endow the material with excellent hydrophobic, oil-repellent and self-cleaning properties. The effective components of most existing waterproof finishing agents are fluorine-containing copolymers. [0003] Because fluorine-containing polymers are extremely inert, the organic solvents used for polymerization...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F212/14C08F220/18C08F2/30C08F220/24C08F220/14C08F214/20C08F214/18C08F214/26C08F2/10
CPCC08F2/10C08F2/30C08F212/14C08F214/186C08F214/205C08F214/265C08F220/14C08F220/18C08F220/24C08F220/56C08F214/245
Inventor 朱宝库银雪梁治樱张斌王文彬宋有志袁佳佳张音王纳川闫妍朱利平
Owner ZHEJIANG UNIV
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