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Method of treating fluoropolymer particles and the products thereof

一种聚合物颗粒、聚合物的技术，应用在涂层等方向，能够解决改质、难以控制等问题

Inactive Publication Date: 2005-07-27
LAUREL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, corona discharge can produce backside treatment, which is undesirable in many applications
[0013] Flame treatment also has limitations such as oxidative surface modification, difficulty in control and possibility of excessive heat load

Method used

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  • Method of treating fluoropolymer particles and the products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1 - Surface treatment of powder

[0069] In this example, fluoropolymer powder particles were surface treated with various macromolecular chemicals.

[0070] Table 1 lists fluoropolymer powders, their average particle size and molecular weight. Table 2 lists the macrochemicals, their molecular weights, minimum and maximum concentrations, cross-linkers and cross-linker concentrations.

[0071] base powder

Average particle size.D 50 Micron

Molecular weight / melt index

PTFE

35

＞1×10 6

PTFE after irradiation

3 to 15

1×10 3 -1×10 6

PVDF

5

Melt viscosity 30Kp at 232°C

FEP

5 to 25

Melt index 2 to 20 at 375°C

ECTFE

25

Melt Index 12

[0072]

macromolecule

Product name

typical

molecular weight

the smallest

concentration

gm / gm

powder

the biggest

concentration

gm / gm

powder

crosslink...

Embodiment 2

[0077] Example 2 - Number of Hydroxyl and Acid

[0078] The degree of surface treatment was determined by titrating the alcohol and acid functional groups of the surface treated fluoropolymer powder particles.

[0079] In this example the method of ASTM D 1957-86 was followed. The method is carried out using an acetylation reaction in which a primary alcohol is converted to an ester by reaction with acetic anhydride, releasing one mole of acetic acid. Upon hydrolysis, this method required less potassium hydroxide to reach the phenolphthalein endpoint (neutralization) compared to the control which produced 2 moles of acetic acid upon hydrolysis.

[0080] In this example, 10.0 g of each surface treatment powder was placed in a 250 ml Erlenmeyer flask and the total weight of the sample and flask was recorded. To the flask was added 5 ml of a 3:1 by volume pyridine:anhydrous acetic acid mixture.

[0081] 9.0-11.0 g of the same sample is placed in a second flask for acid value t...

Embodiment 3

[0090] Example 3 - Weight loss and extraction results

[0091] Extraction tests were performed in this example to surface treat the amount of material that was neither covalently attached nor permanently adsorbed to the fluoropolymer powder.

[0092] Approximately 5 g of each sample was placed on an analytical balance and the weight was recorded. Mix 60 ml of the appropriate solvent (isopropanol for polyethylene glycol, deionized water for polyvinyl alcohol, etc.) with the sample. The mixture was mixed for 2 hours at low heat (about 100°F). After heating, the sample mixture was poured into 150ml Durapore TM 0.22μm filter device. As the solvent passes through the filter, material is removed and collected. Record the total weight of solvent (including extracted material). About 1 g of solvent is placed in an aluminum weighing dish, and the total weight of the solvent and the dish is weighed. The solvent was evaporated in a ventilated oven heated to 100°C. Calculate the p...

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Abstract

Fluoropolymer particles are subjected to high energy treatment so as to change the chemical functionality of the particle surfaces and thereby change the surface characteristics of the particles. These characteristics improve the usefulness of these particles and can make them highly dispersible, even in water. The surface treated fluoropolymer particles are subject to a chemical crosslinking process, or alternatively, are subject to a high energy treatment process, and may optionally be pretreated with a macromolecular chemical species prior to the foregoing processes. The high energy treatment can be used to both surface treat the fluoropolymer particles and in some embodiments, may also cause chain scission of the fluoropolymers to thereby reduce the molecular weight of the fluoropolymer particles. The surface treated fluoropolymer particles can be used to form fluoropolymer coatings on various substrates.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of US Patent Application Serial No. 10 / 128,185, filed April 23,2002. technical field [0003] This invention relates to fluoropolymers. More specifically, the present invention relates to the production of novel fluoropolymers using high energy sources to immobilize macromolecules on the surface of fluoropolymer particles and / or to modify the molecular weight of fluoropolymer particles. Background technique [0004] Fluoropolymers, here broadly defined as any fluorine-containing polymer (or inert polymer), including homopolymers, copolymers and terpolymers having a non-wettable and chemically inert surface, non-wettable And chemically inert surfaces, while desirable in some applications, limit the usefulness of these substances in others. [0005] Based on the physical form of powder and latex fluoropolymers, the art of coating articles with fluoropolymers has developed alon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00C08F14/18C08G81/00C08J3/12C08J3/28C08J7/046
CPCC08J3/12C08J3/28C08F8/00C08J2327/12C08F14/18C08F114/26C08F114/22C08F214/26C08F214/245C08F2/02
Inventor 迈克尔·科茨韦斯·德蒙库尔特·戴维森
Owner LAUREL PROD
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