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Rapidly vulcanized fluoroelastomer and preparation method thereof

A rapid vulcanization and elastomer technology, applied in the chemical field, can solve the problems of low polymerization efficiency and slow polymerization speed, and achieve the effects of high fuel penetration resistance, fast vulcanization speed, and short vulcanization time.

Inactive Publication Date: 2017-06-16
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such an addition method will lead to slow aggregation and low aggregation efficiency

Method used

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  • Rapidly vulcanized fluoroelastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take a 10L polymerization kettle as an example to prepare fluoroelastomer.

[0041] The mole fraction is 7.8 kg of comonomers of 50% vinylidene fluoride, 15% tetrafluoroethylene and 35% hexafluoropropylene monomers, which are prepared into comonomers in the storage tank for future use.

[0042] Add 6.5kg of ion-free water, 65ml of 10wt% sodium perfluorooctanoate solution, and 10g of borax into the cleaned polymerization kettle; evacuate and remove oxygen until the oxygen content is less than 30ppm. Add comonomer to make the polymerization kettle pressurized to a reaction pressure of 1.9 MPa. When the temperature of the polymerization kettle rises to a reaction temperature of 110° C., a metering pump is used to inject 6.5 g of ammonium persulfate initiator with a mass fraction of 10 wt % for reaction. At 70% reaction, 6.5 g of chain terminator 1,2-diiodotetrafluoroethane was added. Half an hour after the reaction started, 450 g of organic initiator tert-butyl hydroperox...

Embodiment 2

[0047] Take a 10L polymerization kettle as an example to prepare fluoroelastomer.

[0048]The preparation method of this example is the same as that of Example 1, except that the mole fractions are 70% vinylidene fluoride, 10% tetrafluoroethylene and 20% hexafluoropropylene monomer, and the comonomer is prepared as 4.55 kg. When the reaction pressure is 1 MPa and the reaction temperature is 130° C., the inorganic initiator is reacted with 20 g of ammonium persulfate initiator with a mass fraction of 10 wt %. When the reaction is 80%, 3.25 g of chain terminator methylene bromide is added. The vulcanization point monomer trifluoroiodoethylene was added in batches after the ammonium persulfate initiator was added to initiate the polymerization reaction, once every 30 minutes on average, 4 times in total, and the total amount added was 2% of the reaction mixed monomer. Half an hour after the reaction started, 650 g of organic initiator tert-butylperoxymaleic acid with a mass fract...

Embodiment 3

[0051] Take a 10L polymerization kettle as an example to prepare fluoroelastomer.

[0052] The preparation method of this example is the same as that of Example 1, except that 55% of vinylidene fluoride, 20% of tetrafluoroethylene and 25% of hexafluoropropylene monomers are used to prepare 6 kg of comonomers. The reaction pressure is 3.0 MPa, the reaction temperature is 85° C., and the inorganic initiator is 32.5 g of ammonium persulfate initiator whose mass fraction is 10 wt %. At 70% reaction, 4.3 g of chain terminator methyl bromide was added. The vulcanization point monomer 1-bromo-2,2-difluoroethylene is added in batches after the ammonium persulfate initiator is added to initiate the polymerization reaction. During the reaction process, the vulcanization point monomer 1-bromo-2,2- Ethylene difluoride was added 5 times in total, and the total amount added was 3% of the reaction mixed monomers. Half an hour after the reaction started, 325 g of diisopropyl peroxydicarbona...

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Abstract

The invention relates to a rapidly vulcanized fluoroelastomer and a preparation method thereof. The rapidly vulcanized fluoroelastomer comprises comonomers. The comonomers comprise two or more of vinylidene fluoride, chlorotrifluoroethylene, tetrafluoroethylene, 3, 3, 3-trifluoropropene, hexafluoropropylene and a perfluoroalkyl ether monomer, and a vulcanization point monomer, wherein a use amount of the vulcanization point monomer is 2-3% that of the comonomers. The rapidly vulcanized fluoroelastomer has high fuel permeability resistance, short vulcanization time, a fast vulcanization rate, low Mooney viscosity and high mechanical properties. The preparation method controls vulcanization time tc90 of the fluoroelastomer within 80s. The rapidly vulcanized fluoroelastomer has Mooney viscosity [ML(1+10 121 DEG C)] of 50-80 DEG C, tensile strength of greater than or equal to 22MPa and elongation of greater than or equal to 230%.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a rapidly vulcanized fluorine-containing elastomer and a preparation method thereof. Background technique [0002] Fluoroelastomers are widely used in aviation, aerospace, automobiles and petrochemicals because of their excellent heat resistance, liquid resistance and oil resistance, as well as good physical and mechanical properties, electrical insulation and radiation resistance. Especially in recent years, the problem faced by automobile fuel hoses is not only the corrosive effect of sour gasoline on nitrile rubber, but mainly the problems of air pollution and atmospheric ozone layer destruction. Therefore, in rubber hoses for automobiles, many general-purpose rubbers can no longer meet the continuously improving performance and environmental protection requirements. Fluoroelastomers are increasingly used in automotive fuel delivery systems due to their excellent temperature resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F214/26C08F214/28C08F214/18C08F2/26C08F2/42
CPCC08F214/22C08F2/26C08F2/42C08F214/26C08F214/28C08F214/182
Inventor 王汉利徐丽娟岳广
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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