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A kind of carboxyl-terminated liquid fluororubber/solid fluororubber blended elastomer material and preparation method thereof

A liquid fluororubber and elastomer material technology, applied in the field of rubber materials, can solve the problems of reducing elongation at break, unable to balance the hardness, toughness and strength of fluororubber well, increasing the hardness of vulcanized rubber, etc., achieving easy industrialization, Good high and low temperature resistance, strength and toughness improvement effect

Active Publication Date: 2019-09-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used reinforcing fillers in fluororubber formulations are mostly inorganic carbon black, white carbon black, calcium fluoride, barium sulfate, talcum powder, mica powder, diatomaceous earth, calcium silicate, graphite, clay and magnesium silicate. The addition of this type of reinforcing filler will increase the hardness of the vulcanized rubber and reduce the elongation at break while enhancing the tensile strength and tear strength of fluororubber, that is, commonly used reinforcing fillers cannot balance the fluorine The hardness, toughness and strength of rubber limit the application of fluororubber under certain circumstances

Method used

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  • A kind of carboxyl-terminated liquid fluororubber/solid fluororubber blended elastomer material and preparation method thereof
  • A kind of carboxyl-terminated liquid fluororubber/solid fluororubber blended elastomer material and preparation method thereof
  • A kind of carboxyl-terminated liquid fluororubber/solid fluororubber blended elastomer material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A carboxyl-terminated liquid fluororubber / solid fluororubber blended elastomer material is prepared from raw materials comprising the following components by weight:

[0053] 95 parts of fluororubber, 5 parts of carboxyl-terminated liquid fluororubber, 5 parts of carbon black N990, 15 parts of silica, 2 parts of bisphenol AF, 3 parts of magnesium oxide, 6 parts of calcium hydroxide, and 0.5 parts of BPP;

[0054] Wherein, the fluororubber is a solid copolymer of vinylidene fluoride and hexafluoropropylene;

[0055] The carboxyl-terminated liquid fluororubber is a liquid copolymer of vinylidene fluoride and hexafluoropropylene with a carboxyl content of 2.5%; its preparation method is: take 250g of vinylidene fluoride-hexafluoropropylene solid copolymer (number-average molecular weight Mn=40w , weight average molecular weight Mw=45w) was dissolved in 784g acetone for 12h. Weigh 120g of hydrogen peroxide solution with a mass concentration of 30%, and 60g of potassium hyd...

Embodiment 2

[0061] A carboxyl-terminated liquid fluororubber / solid fluororubber blended elastomer material is prepared from raw materials comprising the following components by weight:

[0062] 90 parts of fluororubber, 10 parts of carboxyl-terminated liquid fluororubber, 15 parts of fumed silica, 15 parts of silica, 2 parts of AF, 9 parts of calcium oxide, and 1 part of BPP;

[0063] Wherein, the fluororubber is vinylidene fluoride and hexafluoropropylene copolymer;

[0064] The carboxyl-terminated liquid fluororubber is a liquid copolymer of vinylidene fluoride and hexafluoropropylene with a carboxyl content of 3%; its preparation method is: take 250g of vinylidene fluoride-hexafluoropropylene solid copolymer (number average molecular weight Mn=40w , weight average molecular weight Mw=45w) was dissolved in 784g acetone for 12h. Weigh 150g of hydrogen peroxide solution with a mass concentration of 30%, and 80g of potassium hydroxide, and dissolve them in 98mL of water. Add hydrogen pero...

Embodiment 3

[0068] A carboxyl-terminated liquid fluororubber / solid fluororubber blended elastomer material is prepared from raw materials comprising the following components by weight:

[0069] 85 parts of fluororubber, 15 parts of carboxyl-terminated liquid fluororubber, 25 parts of barium sulfate, 15 parts of silica, 2 parts of AF, 9 parts of zinc oxide, 1 part of BPP;

[0070] Wherein, the fluororubber is vinylidene fluoride and hexafluoropropylene copolymer;

[0071] The carboxyl-terminated liquid fluororubber is a copolymer of vinylidene fluoride and hexafluoropropylene with a carboxyl content of 3.5%; its preparation method is: take 250g of vinylidene fluoride-hexafluoropropylene solid copolymer (number-average molecular weight Mn=40w, The weight average molecular weight Mw=45w,) was dissolved in 784g acetone for 12h. Weigh 170g of hydrogen peroxide solution with a mass concentration of 30%, and 100g of potassium hydroxide, and dissolve them in 122mL of water. Add hydrogen peroxide...

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Abstract

Embodiments of the invention relate to rubber materials, and specifically relate to a carboxyl-terminated liquid fluororubber / solid fluororubber blending elastomer material and a preparation method thereof. The material is prepared from the following raw materials: fluororubber, carboxyl-terminated liquid fluororubber and an acid absorbent. Through the utilization of the toughening effect of the carboxyl-terminated liquid fluororubber and the enhancement effect of the ionic crosslinking formed by a terminal carboxyl group in the carboxyl-terminated liquid fluororubber and the acid absorbent, the hardness of the material can be kept without significant enhancement, while the intensity and toughness can be simultaneously and obviously increased, and good comprehensive properties can be achieved; the material has good high and low temperature resistance, oil resistance and chemical medium resistance; and the preparation method is simple, and easy industrialization can be realized.

Description

technical field [0001] The invention relates to rubber materials, in particular to a carboxyl-terminated liquid fluororubber / solid fluororubber blended elastomer material and a preparation method thereof. Background technique [0002] Fluorine rubber has a series of excellent properties such as good chemical medium resistance, heat resistance and oil resistance, and is widely used in national defense, automobile, aerospace, petrochemical and other fields. However, compared with other rubbers, the strength and toughness of fluorine rubber are average, such as: higher tensile strength, lower elongation at break, and average tear performance. At present, the commonly used reinforcing fillers in fluororubber formulations are mostly inorganic carbon black, white carbon black, calcium fluoride, barium sulfate, talcum powder, mica powder, diatomaceous earth, calcium silicate, graphite, clay and magnesium silicate. The addition of such reinforcing fillers will increase the hardness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K3/22C08K3/04C08K3/36
Inventor 刘力姜鹏张孝阿
Owner BEIJING UNIV OF CHEM TECH
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