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Extrusion-grade fluororubber premix with low fuel oil permeability and preparation method thereof

A technology for fuel permeability and fluororubber raw rubber, applied in the field of fluororubber materials, can solve the problems of poor smoothness and flatness of the inner and outer walls of the hose, poor extrusion flow performance, poor composite bonding performance, etc., to meet environmental emissions. Standard, the effect of reducing extrusion expansion ratio, improving extrusion processability

Active Publication Date: 2020-10-30
成都道弘氟橡胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an extrusion-grade fluororubber premix with low fuel oil permeability and its preparation method, so as to solve the problems of poor extrusion fluidity and extrusion swell of fluororubber in the extrusion process in the prior art. Defects such as large size, poor smoothness and flatness of the inner and outer walls of the rubber hose, high fuel permeability, and poor bonding performance with other rubber compounds

Method used

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  • Extrusion-grade fluororubber premix with low fuel oil permeability and preparation method thereof
  • Extrusion-grade fluororubber premix with low fuel oil permeability and preparation method thereof
  • Extrusion-grade fluororubber premix with low fuel oil permeability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1.1 Preparation of fluororubber premix:

[0042] The fluorine content is 69%, the molecular weight distribution is wide, Mw / Mn≧5, the molecular weight Mw is 60,000, 190,000, 280,000, 370,000, and 530,000, respectively, and the corresponding Mooney viscosity ML121°C (1+10) is 12, 23, 31, 39, 48, each 30kg of ternary fluororubber raw rubber of five different Mooney viscosities; according to the formula table of fluororubber premixed rubber in the following table 1 (each raw material is calculated by weight) and ready for use . Prepare fluororubber premixed rubber 1, fluororubber premixed rubber 2, fluororubber premixed rubber 3, fluororubber premixed rubber 4, and fluororubber premixed rubber 5 according to the following preparation methods:

[0043] Table 1 Fluorine rubber premix formula table (embodiment 1 and comparative example 1)

[0044]

[0045] Preparation:

[0046]A1. According to the ratio, put 30kg of corresponding raw rubber into a 20L internal mixer for...

Embodiment 2

[0066] 2.1 Preparation of fluororubber premix:

[0067] Take 90 kg of ternary fluororubber raw rubber with a fluorine content of 69%, a wide molecular weight distribution, a molecular weight Mw of 260,000, and a Mooney viscosity of ML121°C (1+10) of 28, and use the fluororubber premixed rubber in Table 4 below The fluororubber premixed rubber 6-9 in the formula table (each raw material is calculated by weight) is ready for use; the fluorine content is 69%, the bimodal distribution, the molecular weight Mw is 330,000, and the Mooney viscosity ML is 121°C (1+10) 30 ternary fluororubber raw rubber 60kg, prepared by fluororubber premixed rubber 10-11 in the fluororubber premixed rubber formula table (each raw material is by weight) in the following table 4, ready for use, according to the following Preparation method Prepare fluororubber premix 6, fluororubber premix 7, fluororubber premix 8, fluororubber premix 9, fluororubber premix 10, fluororubber premix 11 in sequence:

[00...

Embodiment 3

[0091] 3.1 Preparation of fluororubber premix:

[0092] Take 180kg of ternary fluororubber raw rubber with a fluorine content of 69%, a molecular weight bimodal distribution, a molecular weight Mw of 330,000, and a Mooney viscosity of ML121°C (1+10) respectively being 30, and premix the fluororubber according to the following table 7. The fluororubber premixed rubber 12-17 in the rubber formula table (each raw material is calculated by weight) is ready for use. Prepare fluororubber premixed rubber 12, fluororubber premixed rubber 13, fluororubber premixed rubber 14, fluororubber premixed rubber 15, fluororubber premixed rubber 16, fluororubber premixed rubber 17 according to the following preparation method:

[0093] Table 7 Fluorine rubber premix formula table (embodiment 3 and comparative example 3)

[0094]

[0095] Preparation:

[0096] A1. According to the ratio, put 30kg of corresponding raw rubber into a 20L internal mixer for 4 minutes of masticating, and the mast...

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Abstract

The invention provides an extrusion-grade fluororubber premix with low fuel oil permeability and a preparation method thereof, and solves the technical problems of high fuel oil permeability, poor extrusion processability and poor composite bonding performance with other rubber of an automobile fuel oil rubber hose prepared from an existing fluororubber material. The fluororubber premix is prepared from the following raw materials in parts by weight: 100 parts of fluororubber raw rubber, 1.2 to 2.5 parts of a vulcanizing agent, 0.2 to 1.0 part of a vulcanization accelerator, 1-6 parts of an extrusion processing aid, and 0.5-3 parts of a technological processing aid. The fuel oil permeability is improved by selecting the fluorine content of the fluororubber raw rubber; the composite bondingperformance with other rubber is improved by selecting a vulcanization accelerator; the extrusion processability is improved by selecting fluororubber raw rubber with wide distribution and bimodal distribution and an extrusion processing aid. The environment emission standard is met, so that the method is widely applied to the rubber pipe industry with more strict requirements.

Description

technical field [0001] The invention relates to a fluororubber material, in particular to an extrusion-grade fluororubber premixed rubber with low fuel oil permeability and a preparation method. Background technique [0002] In the rubber industry, fluorine rubber has excellent properties unmatched by other rubbers, such as high temperature resistance, oil resistance, corrosion resistance to various strong acids and alkalis and chemicals, resistance to ozone and various oxidants, and radiation resistance. Viton has been widely used in the automotive industry, one of the important applications is automotive fuel hoses, but with the increasingly stringent environmental emission standards for automobiles, especially the implementation of the National VI emission standards for automobiles, the fuel permeability of fluororubber hoses The requirements are becoming more and more stringent. Traditional fluororubber hoses can no longer meet their requirements. At the same time, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L23/06C08K5/136C08K13/02C08K3/22C08K3/30C08K3/04B29C48/07
CPCC08L27/16B29C48/07C08K2003/222C08K2003/2206C08L23/06C08K5/136C08K13/02C08K3/22C08K3/30C08K3/04
Inventor 周武刚张定文郑贤君
Owner 成都道弘氟橡胶有限公司
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