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A modified fluoroelastomer, its preparation method and application

An elastomer and modification technology, applied in the field of modified fluoroelastomers, can solve the problem that fluororubber is difficult to fundamentally improve its performance.

Active Publication Date: 2018-12-07
ZHEJIANG RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simple pre-mixing is difficult to fundamentally solve the problem of mixing uniformity between reinforcing particles and rubber matrix
[0005] Chinese patent CN100467525C discloses fluororubber with improved tear strength and its preparation method. The length of carbon fiber used is 5.5-10 mm, and the dosage is 5-10 parts by weight / 100 parts by weight of fluororubber premixed rubber. The rubber is passed 4 to 8 times to disperse the carbon fiber in the fluororubber compound to prepare the fluororubber with improved tear strength, but this patent only improves the tear strength of the product
[0006] The above modification of fluororubber is basically based on physical modification, and it is difficult to fundamentally improve the performance of the modified fluororubber.

Method used

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  • A modified fluoroelastomer, its preparation method and application
  • A modified fluoroelastomer, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 3L of deionized water, 1.5g of perfluorooctanoic acid, 1.5g of disodium hydrogen phosphate and 540g of heptaaminovinyl POSS into a 5L reactor. The temperature of the reactor was raised to 60° C., and the reaction monomer was charged to 2.5 MPa with a gas composition of 48 wt % vinylidene fluoride (VDF), 47 wt % hexafluoropropylene (HFP), and 5 wt % chlorotrifluoroethylene. Subsequently, 40 mL of 10 wt % ammonium persulfate initiator aqueous solution was continuously added at a rate of 10 mL / h. During the reaction process, the gas reaction monomer was continuously added to maintain the pressure of the reactor at 2.5 MPa. When the addition of the gas reaction monomer reached 30% of the total weight of the reaction, 9g of chloroform was added. During the reaction process, a total of 1300 g of gaseous reactive monomers were added to the reactor, and the total reaction time was 4 hours. The polymerized emulsion was demulsified, washed and dried to obtain 1150 g of POSS...

Embodiment 2

[0048] 3L of deionized water, 75g of ammonium perfluorooctanoate, 30g of potassium dihydrogen phosphate and 180g of hepta(tetramethylammoniumoxy)propenyl POSS were added to a 5L reactor. The temperature of the reactor was raised to 100° C., and the gaseous reaction monomer was composed of 65wt% vinylidene fluoride (VDF), 32wt% hexafluoropropylene (HFP) and 3wt% trifluoroethylene, and the pressure was charged to 3.5MPa. Subsequently, 40 mL of 10 wt % potassium persulfate initiator aqueous solution was continuously added at a rate of 10 mL / h. During the reaction process, the gas reaction monomer was continuously added to maintain the pressure of the reactor at 3.5 MPa. When the addition of the gas reaction monomer reached 35% of the total weight of the reaction, 9g of diethyl malonate was added. During the reaction process, a total of 1500 g of gas reaction monomers were added to the reactor, and the total reaction time was 4 hours. The polymerized emulsion was demulsified, wa...

Embodiment 3

[0051] Add 3L of deionized water, 15g of potassium perfluorooctanoate, 45g of sodium tetraborate and 15g of heptaanilinemethylbutenyl POSS into a 5L reactor. Reactor was heated up to 90°C, with 40wt% vinylidene fluoride (VDF), 53wt% hexafluoropropylene (HFP), 7wt% BrCF 2 CF 2 CH=CH 2 The gas reaction monomer is charged to 1.3MPa. Subsequently, 40 mL of 10 wt % ammonium persulfate initiator aqueous solution was continuously added at a rate of 10 mL / h. During the reaction process, the gas reaction monomer was continuously added to maintain the pressure of the reactor at 1.3MPa. When the addition amount of the gas reaction monomer reached 10% of the total weight of the reaction, 9 g of isopentane was added. During the reaction process, a total of 1300 g of gaseous reactive monomers were added to the reactor, and the total reaction time was 4 hours. The polymerized emulsion was demulsified, washed and dried to obtain 1150 g of POSS modified fluoroelastomer.

[0052] After te...

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Abstract

The invention discloses a modified fluoroelastomer. The modified fluoroelastomer comprises the following copolymerizing units of 0.1-15wt% of water-soluble silsesquioxane with structural formula shown in description, 40-70wt% of vinylidene fluoride, 20-50wt% of perfluoropropylene and 0.1-5wt% of vulcanized monomer. The invention also provides a preparation method of the modified fluoroelastomer. The modified fluoroelastomer is suitable for preparing sealing material and fuel tubes.

Description

technical field [0001] The present invention relates to a fluoroelastomer, in particular to a modified fluoroelastomer. Background technique [0002] Fluoroelastomers have good heat resistance, chemical resistance and weather resistance, and are especially suitable for use as sealing materials and fuel pipes around automobiles and aircraft engines that require high reliability. As sealing materials and fuel pipes around automobiles and aircraft engines, it is hoped that fluoroelastomers can have higher heat resistance and mechanical properties, so improving the heat resistance and mechanical properties of fluoroelastomers has become a hot spot in recent technical research. [0003] Chinese patent CN101412835B discloses a blend of fluorine rubber and silicone rubber, which is prepared by proportioning fluorine rubber, silicone rubber, solubilizer, acid absorbing agent, reinforcing filler, structure control agent, vulcanizing agent and crosslinking aid The blend of fluorine r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/22C08F214/28C08F214/24C08F214/18C08F230/08C08L27/16
Inventor 陈科赵柯宋健阮环阳高自宏
Owner ZHEJIANG RES INST OF CHEM IND CO LTD