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Preparation method of high-elongation fluororubber F2311

A high-elongation, fluororubber technology, applied in adhesives, coatings, etc., can solve the problem of reducing the aging resistance, weather resistance, and corrosion resistance of fluororubber F2311 coatings, and it is difficult to improve the coating leveling effect, coating thickness, and sensitivity Problems such as surfactants, to achieve the effect of prolonging the polymerization reaction time, improving the van der Waals force, and prolonging the reaction time

Inactive Publication Date: 2019-02-12
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1415658A discloses a fluorine-containing carbon group hydrophobic associative thickener, which is polymerized from acrylic acid or methacrylic acid ester, acrylate and bifunctional groups, and its fluorine content is less than 1%, which can effectively improve the flow of coatings. Flatness and improved splash resistance, but its disadvantages are sensitivity to PH value, sensitivity to surfactants, etc., which are not conducive to later processing and use; in recent years, there have been related reports that polyamide wax has high viscosity and is anti-splashing. Settlement and sag resistance are good, but because polyamide wax does not contain fluorine, adding it to F2311 coatings will greatly reduce the performance of fluororubber F2311 coatings in terms of aging resistance, weather resistance, and corrosion resistance.
[0007] However, the existing fluororubber F2311 raw rubber has an elongation rate of 300% to 450%, and an intrinsic viscosity of 1.5 to 2.5
Patent CN101186667A provides high-strength ternary fluorine rubber with a raw rubber elongation of 350%, but the raw rubber elongation is too low to improve the coating leveling effect and coating thickness requirements

Method used

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  • Preparation method of high-elongation fluororubber F2311
  • Preparation method of high-elongation fluororubber F2311

Examples

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Effect test

Embodiment 1

[0038] This embodiment relates to the preparation method of the fluororubber F2311 described in this application, comprising the following steps:

[0039] 1) Add 30L deionized water to the 50L reactor, and evacuate the reactor until the oxygen content is ≤30ppm;

[0040] 2) Add a mixed monomer of vinylidene fluoride and chlorotrifluoroethylene to the reaction kettle at a molar ratio of 1:1 until the pressure is 2.3Mpa, and when heated to a temperature of 60°C, add 3g of potassium permanganate and 1g of potassium bromide , 15g sodium hydroxide, 50g perfluoropolyether sodium carboxylate, start polymerization reaction;

[0041]3) During the reaction process, continue to add the mixed monomer of vinylidene fluoride and chlorotrifluoroethylene to maintain the pressure of the reactor at 2.3Mpa, and stop when the reaction time is 4.5 hours and the mixed monomer is fed about 8-10kg. Recover the unreacted monomer to the monomer storage tank, evacuate, release the emulsion, add a small...

Embodiment 2

[0043] This embodiment relates to the preparation method of the fluororubber F2311 described in this application, comprising the following steps:

[0044] 1) Add 30L deionized water to the 50L reactor, and evacuate the reactor until the oxygen content is ≤30ppm;

[0045] 2) Add a mixed monomer of vinylidene fluoride and chlorotrifluoroethylene to the reaction kettle at a molar ratio of 1:1 until the pressure is 1.8Mpa, and when heated to a temperature of 62°C, add 2g potassium persulfate, 1g sodium metabisulfite, 15g Borax, 45g ammonium perfluorooctanoate, start polymerization;

[0046] 3) During the reaction process, continue to add the mixed monomer of vinylidene fluoride and chlorotrifluoroethylene to maintain the pressure of the reactor at 1.8Mpa. After the reaction is completed, stop when the reaction time is 4.2 hours and the mixed monomer is fed about 8-10kg . Recover the unreacted monomer to the monomer storage tank, evacuate, release the emulsion, add a small amount...

Embodiment 3

[0048] This embodiment relates to the preparation method of the fluororubber F2311 described in this application, comprising the following steps:

[0049] 1) Add 30L deionized water to the 50L reactor, and evacuate the reactor until the oxygen content is ≤30ppm;

[0050] 2) Add a mixed monomer of vinylidene fluoride and chlorotrifluoroethylene to the reaction kettle at a molar ratio of 1:1 until the pressure is 2.0Mpa, and when heated to a temperature of 68°C, add 4g of succinic acid peroxide and 1g of brominated Sodium, 15g dipotassium hydrogen phosphate, 35g sodium perfluorooctanoate, start the polymerization reaction;

[0051] 3) During the reaction process, continue to add the mixed monomer of vinylidene fluoride and chlorotrifluoroethylene to maintain the pressure of the reactor at 2.0Mpa. After the reaction is completed, stop when the reaction time is 4.8 hours and the mixed monomer is fed about 8-10kg. . Recover the unreacted monomer to the monomer storage tank, evacu...

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Abstract

The invention relates to a preparation method of high-elongation fluororubber F2311. According to the preparation method, in a process of preparing the fluororubber F2311 by adopting an emulsion polymerization method and using vinylidene fluoride and chlorotrifluoroethylene as raw materials, the reaction time is controlled to be 1.5-3 times of the conventional reaction time, and the fluorine-containing carboxylate or fluorine-containing alkyl sulfonate emulsifiers and an initiator of a redox system are selected for use in a reaction process. The preparation method provided by the invention effectively controls the homogeneity of copolymer chain links of the vinylidene fluoride and the chlorotrifluoroethylene and improves the regularity of the polymer molecules by prolonging the polymerization reaction time, thereby improving the van der waals force between the molecules. The preparation method provided by the invention is simple to operate, and increases the raw rubber elongation of the fluororubber F2311; the raw rubber elongation is 700% or above, and the fluorine content is 40% or above. The obtained fluororubber F2311 can be used for coatings, has high fluorine content, aging resistance, weather fastness and corrosion resistance, improves the leveling effect and coating thickness of the coatings, and also can be applied to the field of adhesive.

Description

technical field [0001] The invention relates to the field of synthetic polymer materials, in particular to a preparation method of high-elongation fluororubber F2311. Background technique [0002] Fluorine rubber F2311 is an elastomer formed by the copolymerization of vinylidene fluoride and chlorotrifluoroethylene at a molar ratio of 1:1. It has excellent acid resistance and chemical resistance. In particular, it has excellent resistance to fuming nitric acid. [0003] Coatings are mainly water-based or solvent-based coatings. The fluororubber F2311 used in coatings has a small amount of other additives (usually less than 5%) except for its own solvent, but these small amounts of additives can be used to solve many problems in production. It plays a key role in improving and improving the performance of coatings, coating films and adhesives. It is an indispensable component in the production and construction of coatings. Asia is the largest consumption area for coatings an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F214/24C08F4/40C08F2/26C09D127/16C09D127/12C09J127/16C09J127/12
CPCC08F2/26C08F4/40C08F214/22C08F214/24C09D127/12C09D127/16C09J127/12C09J127/16
Inventor 余金龙汪仲权张廷健曾波王先荣龚蓉李慧
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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