FEP colorful particle processing method

A processing method and particle technology, applied in the processing field of FEP colored particles, to achieve the effects of cost reduction, uniform and stable chromaticity, and uniform mixing

Inactive Publication Date: 2019-04-16
ZHEJIANG XINGTENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing evenly colored FEP colored particles for the deficiencies in the current FEP colored particle processing technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A processing method of FEP colored particles, the processing method of the FEP colored particles comprises the following steps:

[0026] (1) Fluorination pretreatment: Add sufficient amount of FEP fluororesin powder with a melting index of 20g / 10min into the fluorination reactor, and feed a mixed gas with a gas volume ratio of fluorine gas and nitrogen gas of 1:7, at 150°C After 16 hours of reaction, the unstable end groups on FEP such as carboxyl, vinyl, acyl and other end groups are fluorinated to obtain fluorinated FEP fluororesin, which enhances chemical stability;

[0027] ⑵ Mixing:

[0028] Bake a sufficient amount of high-temperature pigment powder in a vacuum oven at 140°C for 50 minutes, then pass through a 300-mesh sieve to remove large-grained toner, and take it out for later use;

[0029] Bake a sufficient amount of nano-scale dispersant and modified filler PTFE in a vacuum oven at 200°C for 2 hours, then take them out for use;

[0030] Get the dispersant ...

Embodiment 2

[0035] A processing method of FEP colored particles, the processing method of the FEP colored particles comprises the following steps:

[0036] (1) Fluorination pretreatment: Add sufficient amount of FEP fluororesin powder with a melting index of 24g / 10min into the fluorination reactor, and feed a mixed gas with a gas volume ratio of fluorine gas and nitrogen gas of 1:6, at 160°C After 18 hours of reaction, the unstable end groups on FEP such as carboxyl, vinyl, acyl and other end groups are replaced by fluorination to obtain fluorinated FEP fluororesin, which enhances chemical stability;

[0037] ⑵ Mixing:

[0038] Bake a sufficient amount of high-temperature toner powder in a vacuum oven at 150°C for 40 minutes, then pass through a 400-mesh sieve to remove large-grained toner, and take it out for later use;

[0039] Bake a sufficient amount of nano-scale dispersant and modified filler PFA in a vacuum oven at 200°C for 2 hours, then take them out for use;

[0040] Get the d...

Embodiment 3

[0045] A processing method of FEP colored particles, the processing method of the FEP colored particles comprises the following steps:

[0046] (1) Fluorination pretreatment: Add sufficient amount of FEP fluororesin powder with a melting index of 30g / 10min into the fluorination reactor, and feed a mixed gas with a gas volume ratio of fluorine gas and nitrogen gas of 1:5, at 170°C After 20 hours of reaction, the unstable end groups on FEP such as carboxyl, vinyl, acyl and other end groups are replaced by fluorination to obtain fluorinated FEP fluororesin to enhance chemical stability;

[0047] ⑵ Mixing:

[0048] Bake a sufficient amount of high-temperature toner powder in a vacuum oven at 160°C for 30 minutes, then pass through a 500-mesh sieve to remove large-grained toner, and take it out for later use;

[0049] Bake a sufficient amount of nano-scale dispersant and modified fillers PTFE, PFA, PVDF, ETFE in a vacuum oven at 200°C for 2 hours, then take them out for use;

[005...

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Abstract

The invention discloses a processing method for uniform-colored FEP colorful particles. The processing method comprises the following steps: (1) fluorination pretreatment: FEP fluororesins in raw materials are added in a reactor; fluorine and nitrogen mixed gas with a certain ratio is introduced for reaction by a period of time at a proper temperature; and instable end groups on FEP are replaced by fluorination to obtain fluorinated FEP fluororesins; (2) mixing: the fluorinated FEP fluororesins, dispersing agents, modified fillers and pigment are put in a container for mixing according to a certain ratio for full mixing; (3) melting extrusion: the uniform-mixed materials in the step (2) are added in an extruder for melting extrusion molding at a proper temperature; and (4) postprocessing:the molded products extruded in the step (3) are subsequently processed, including cooling, dehydration, dicing and drying. In the fluorination process of FEP fluororesin base stocks, through removalof active end groups, the surfaces of colorful particle products are smoother, and such bad phenomenon as lumps, projections and bubbles is reduced to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of colored fluororesins, in particular to a method for processing uniformly colored FEP colored particles. Background technique [0002] Perfluoroethylene propylene copolymer (FEP) has excellent high temperature resistance, stable chemical properties, good electrical insulation, outstanding surface non-stickiness and good mechanical strength, and is a high-performance fluororesin material. FEP materials can be used to make pipes, linings of chemical equipment, surface layers of drums, and insulation materials for cables and wires. They are mainly used in aerospace, ships, and internal wires of electronic equipment, as well as wires and cables for computer networks, subways, and vehicles. . [0003] The white insulated wires and cables made of FEP are gradually being replaced by colored cables because they cannot be distinguished from each other in use and the marking is inconvenient. However, the domestic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/06B29C48/25B29C48/17B29B7/74
CPCB29B7/74B29B9/06
Inventor 洪海江孔仙达张璐
Owner ZHEJIANG XINGTENG CHEM
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