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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: 2022-05-24
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] Take the fluorine content of 69%, wide molecular weight distribution, Mw / Mn≧5, molecular weight Mw of 60,000, 190,000, 280,000, 370,000, and 530,000 respectively, corresponding to Mooney viscosity ML121 ℃ (1+10) respectively 12, 23, 31, 39, 48, 30kg each of five kinds of ternary fluororubber raw rubber with different Mooney viscosities; according to the formula table of fluororubber pre-mixed rubber in the following table 1 (each raw material is calculated by weight) ready for use . Prepare fluororubber premix 1, fluororubber premix 2, fluororubber premix 3, fluororubber premix 4, and fluororubber premix 5 in sequence according to the following preparation methods:

[0043] Table 1 Fluorine rubber premix formula table (Example 1 and Comparative Example 1)

[0044]

[0045] Preparation:

[0046]A1. Put 30kg of the corresponding raw rubber into a 20L internal mixer for 3 minutes according to the ratio, and the plastic...

Embodiment 2

[0066] 2.1 Preparation of fluororubber premix:

[0067] Take 90kg of 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. According to the fluororubber premixed rubber in the following table 4 The fluororubber premix 6-9 in the formula table (each raw material is by weight) is ready for use; take fluorine content of 69%, bimodal distribution, molecular weight Mw of 330,000, Mooney viscosity ML121 ℃ (1+10) 60kg of ternary fluororubber raw rubber of 30, prepared according to the fluororubber premix 10-11 in the fluororubber premix 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, and fluororubber premix 11 in sequence:

[0068] Table 4 Fluorine rubber p...

Embodiment 3

[0091] 3.1 Preparation of fluororubber premix:

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

[0093] Table 7 Fluorine rubber premix rubber formula table (Example 3 and Comparative Example 3)

[0094]

[0095] Preparation:

[0096] A1. Put 30kg of the corresponding raw rubber into a 20L internal mixer for 4 minutes according to the ratio, and the plasticating temperature is controlled at 80℃-90℃;

[0097] A2. Add the pr...

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Abstract

The invention provides an extrusion-grade fluororubber premixed rubber with low fuel permeability and a preparation method, which solves the problems of high fuel permeability, poor extrusion processing performance and other rubber hoses prepared from existing fluororubber materials. The technical problem of poor composite bonding performance. The preparation of the fluororubber premix includes the following raw materials in parts by weight: 100 parts of fluororubber raw rubber; 1.2-2.5 parts of vulcanizing agent; 0.2-1.0 part of vulcanization accelerator; 1-6 parts of extrusion processing aid; 0.5-3 parts of processing aids. The present invention improves the fuel oil permeability through the selection of the fluorine content of the fluororubber raw rubber; through the selection of the vulcanization accelerator, the composite bonding performance with other rubbers is improved; Improve extrusion processability. Meet the environmental emission standards, so it is widely used in the hose industry with more stringent requirements.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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