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High fluidity ethylene-tetrafluoroethylene copolymer composition and its preparation method

A technology of tetrafluoroethylene and copolymer is applied in the field of preparation of the ethylene-tetrafluoroethylene copolymer resin, and can solve the problems such as the inability to take into account the high-speed molding ability of the resin

Active Publication Date: 2016-05-25
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method focuses on improving the performance of the resin, and it cannot take into account the high-speed forming ability of the resin

Method used

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  • High fluidity ethylene-tetrafluoroethylene copolymer composition and its preparation method
  • High fluidity ethylene-tetrafluoroethylene copolymer composition and its preparation method
  • High fluidity ethylene-tetrafluoroethylene copolymer composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Add 6L of 1,1,1,3,3-pentafluorobutane, 50g of perfluorobutylethylene and 10ml of methanol into a 10L stainless steel autoclave that has undergone oxygen removal treatment, raise the temperature to 40°C while stirring, and add tetrafluoroethylene / Ethylene=75 / 25 (mol%) mixed gas to pressure is 0.800MPa, the concentration that adds 40ml is 0.040mol / L (C 3 f 7 OC 2 f 4 CO 2 ) 2 solution of 1,1,1,3,3-pentafluorobutane to start polymerization. When the pressure drops by 0.005MPa, it means there is a reaction. At this moment, continuously add the mixed gas of tetrafluoroethylene / ethylene (mol%)=55 / 45, make the pressure constant at 0.8MPa; 3 f 7 OC 2 f 4 CO 2 ) 2 1,1,1,3,3-Pentafluorobutane solution. After 120 minutes, the addition of the initiator was stopped, and the mixed gas of tetrafluoroethylene / ethylene (mol%)=55 / 45 was continuously added, and the gas pressure in the reactor was still kept constant at 0.8 MPa. After continuing to react for 30 min, the polym...

Embodiment 2

[0088] Except that the time of continuously adding initiator is 100min, other conditions are identical with embodiment 1. The obtained product was named ETFE-3 and weighed 560 g. The unit composition of the ETFE-3 copolymer was such that the molar ratio of repeating units based on TFE / repeating units based on E / repeating units based on PFBE was 54.6 / 42.8 / 2.6. The properties of ETFE-3 are shown in Table 2.

[0089] Table 2 Physical properties of ETFE-3

[0090]

Embodiment 3

[0092] Except that the post-reaction time is 20min, other conditions are exactly the same as Example 1. The obtained product was named ETFE-4 and weighed 560 g. The unit composition of the ETFE-4 copolymer was such that the molar ratio of repeating units based on TFE / repeating units based on E / repeating units based on PFBE was 54.4 / 43.1 / 2.5. The properties of ETFE-4 are listed in Table 3.

[0093] Table 3 Physical properties of ETFE-4

[0094]

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Abstract

The invention discloses a high-fluidity ethylene-tetrafluoroethylene (ETFE) copolymer composition and a preparation method thereof. The composition comprises a first ETFE component and a second ETFE component, the first ETFE component and the second ETFE component have a basically same composition and have different molecular weights, and each of the first ETFE component and the second ETFE component comprises an ethylene repeating unit A, a tetrafluoroethylene repeating unit B and another repeating unit C which can be copolymerized with ethylene and tetrafluoroethylene, wherein a molar ratio of the ethylene repeating unit A to the tetrafluoroethylene repeating unit B is 40 / 60-40 / 60; the another repeating unit C is 0.1-5.0% of the total mole of the ethylene repeating unit A and the tetrafluoroethylene repeating unit B; the melt flow index of the composition at 297DEG C under 5kg is 15-150g / 10min; and the ethylene-tetrafluoroethylene copolymer resin composition has two melting points, the first melting point is 218-233DEG C, and the second melting point is 245-275DEG C.

Description

technical field [0001] The present invention relates to a high-fluidity ethylene-tetrafluoroethylene copolymer composition, which has flow properties while substantially maintaining the mechanical properties and heat resistance of ethylene-tetrafluoroethylene copolymer resins. Meet the requirements of high-speed processing and have better yellowing performance. The invention also relates to a preparation method of the ethylene-tetrafluoroethylene copolymer resin. Background technique [0002] Ethylene-tetrafluoroethylene copolymer (hereinafter also referred to as "ETFE") is a fusible fluoropolymer with excellent electrical properties, chemical resistance and aging resistance, and due to the introduction of ethylene, ETFE It has excellent radiation resistance and its density is very low. Furthermore, due to the modification of the third monomer, its mechanical properties (wear resistance, crack resistance, impact resistance, etc.) are greatly improved, and it is the stronge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08L23/08C08F214/26C08F210/02C08F214/18C08F2/34
Inventor 杜丽君沈骥昉吴君毅
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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