Preparation method of fluororesin composite, fluororesin composite and product produced by molding fluororesin composite

A manufacturing method, fluororesin technology, applied in other household appliances, household components, applications, etc., can solve the problems of expensive special devices, increase production processes, needs, etc., and achieve the effect of excellent tensile properties

Active Publication Date: 2015-11-25
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical crosslinking and radiation crosslinking after molding increase the production process and reduce productivity
Among them, chemical cross-linkin

Method used

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  • Preparation method of fluororesin composite, fluororesin composite and product produced by molding fluororesin composite
  • Preparation method of fluororesin composite, fluororesin composite and product produced by molding fluororesin composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0271] Fluoroplastic (B1-1) 0.85kg, cross-linking agent (C-1) added at 0.99w% according to the mass sum of fluoroplastic (B1-1) and fluororesin (A1-1) described later at 0.28w% The cross-linking aid (D-1) and 8.5 g of the processing accelerator (D-3) were kneaded on a twin-roller until uniform, and a fluororubber rubber sheet was obtained. In order to mix it evenly with the fluororesin, the obtained rubber sheet was cut into 2mm-sized particles on a rubber pelletizer.

[0272] After mixing the aforementioned rubber particles and 2.15kg of fluororesin (A1-1) evenly, add them into a twin-screw extruder (manufactured by Nanjing Jieya Extrusion Equipment Co., Ltd. L / D=40, outer diameter D=35.6mm, length L =1424mm.), according to the screw speed (rpm) represented in Table 1, the shear rate (s) when twin-screw extruder mixing -1 ), the average extrusion amount (kg / h) is melt-kneaded and extruded, and the fluororubber (B1-1) is cross-linked to become a cross-linked fluororubber (B'1...

Embodiment 2 and comparative example 3、4

[0281] Use cross-linking agent (C-2) instead of cross-linking agent (C-1); cross-linking aid (D-2) instead of cross-linking aid (D-1), fluororesin (A1-1), fluoroplastic (B1-1), the addition of cross-linking agent (C-2) and cross-linking auxiliary agent (D-2), and shear rate, average extruded volume and all in table 2 when twin-screw extruder mixing Except for the difference, the same fluororesin composite as in Example 1 was prepared.

[0282] The average particle diameter of the crosslinked fluororubber (B'1-1) in the fluororesin composite obtained by embodiment 2 and comparative examples 3 and 4, MFR (g / 10min), the mechanical strength of the product (tensile strength ( MPa), elongation at break (%)) are shown in Table 2.

[0283] Table 2: Fluorine resin compound formula, preparation process and performance comparison

[0284]

[0285] As shown in Table 2, the mixing shear rate of the twin-screw extruder is 1434s -1 The tensile strength of the product obtained in the em...

Embodiment 2

[0286] The addition amount of crosslinking agent (C-2) and crosslinking aid (D-2) of embodiment 2 is close to comparative example 4, has the same trend, and has nothing to do with the addition amount of the two, which shows that twin-screw extrusion The shear rate during extruding mixing is an important reason for the excellent tensile properties of the product.

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Abstract

The invention relates to a preparation method of a fluororesin composite, the fluororesin composite obtained by the preparation method and a product. The preparation method of the fluororesin composite is a preparation method of a fluororesin (A) and crosslinked fluororubber (B') containing fluororesin composite, and comprises a process of mixing the fluororesin (A), fluorine raw rubber (B) and a crosslinking agent (C) in a twin-screw extruder. The mixing temperature of the twin-screw extruder is higher than a melting point of the fluororesin resin (A), the shearing rate of the twin-screw extruder is from 240s<-1> to 1600s<-1>, the average extrusion output of the twin-screw extruder is more than 10kg/h, and the ratio (L/D) of the length (L) to the outer diameter (D) of a screw of the twin-screw extruder is more than 20, and the screw speed of the twin-screw extruder is 50-700rpm.

Description

technical field [0001] The invention relates to a manufacturing method of a fluororesin compound and a molding technology of related products of the fluororesin compound. Background technique [0002] Fluororubber has excellent heat resistance and flexibility. Under high temperature conditions, it is used for products that require both heat resistance and flexibility, such as wire insulation layers. [0003] In the manufacturing process of fluorine-containing rubber wire insulation layer, usually after molding, thermochemical crosslinking and electron radiation crosslinking are used to improve the strength of fluorine rubber (References 1-3). However, chemical crosslinking and radiation crosslinking after molding increase the production process and reduce productivity. Among them, chemical cross-linking has a long cross-linking time and low production efficiency. Furthermore, the use of radiation crosslinking requires expensive special equipment as well as large site space...

Claims

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Application Information

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IPC IPC(8): B29C47/02B29C47/38C08L27/18B29C48/395
CPCB29C48/022B29C48/154B29C48/395B29L2031/3462C08L27/18C08L2205/025
Inventor 刘预细田朋也本多诚小野光史西荣一
Owner SHANGHAI JIAO TONG UNIV
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