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A kind of highly redispersible fluoroplastic aqueous dispersion liquid and its preparation method and application

A water-based dispersion and redispersibility technology, which is applied in coating, fiber treatment, textiles and papermaking, etc., can solve the problems of poor mechanical stability, agglomerates, and poor redispersibility, and achieve good impact resistance and improve redispersibility. Excellent dispersibility and crack resistance

Active Publication Date: 2021-11-05
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing PTFE concentrated dispersion liquid has poor mechanical stability and is easy to agglomerate to form agglomerates
[0004] During the storage of concentrated PTFE dispersions, if they are stored statically for a long time, sedimentation will occur, and products with poor redispersibility will produce coagulation at the bottom, which will affect their use

Method used

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  • A kind of highly redispersible fluoroplastic aqueous dispersion liquid and its preparation method and application
  • A kind of highly redispersible fluoroplastic aqueous dispersion liquid and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0031] A method for preparing a highly redispersible fluoroplastic aqueous dispersion, comprising the following steps:

[0032] (1) Add 112.5g nonionic surfactant to 3kg polytetrafluoroethylene aqueous polymerization liquid and stir evenly, add the ammoniacal liquor that the mass fraction is 25% and adjust the pH value of the system to be 10, the system is heated to 87 ℃, at 87 Stand at ℃ for 3 hours, until the upper layer forms a large amount of transparent aqueous solution layer, let the system stand at room temperature, the upper layer forms a transparent aqueous solution layer, the lower layer is a concentrated emulsion layer, remove the upper aqueous layer, and obtain a concentrated polytetrafluoroethylene dispersion. Test polytetrafluoroethylene concentrated dispersion, the content that obtains polytetrafluoroethylene dry material is 65% of polytetrafluoroethylene concentrated dispersion liquid quality, and the content of nonionic surfactant is 1.8% of polytetrafluoroethy...

Embodiment 2

[0035] A kind of preparation method of highly redispersible fluoroplastic aqueous dispersion liquid, with embodiment 1, difference is:

[0036] In step (2), add nonionic surfactant to polytetrafluoroethylene concentrated dispersion liquid, make the total content of nonionic surfactant be 3.5% of polytetrafluoroethylene dry material quality, add water-soluble resin PVP K90, the content of water-soluble resin PVP K90 is 0.3% of the dry material of polytetrafluoroethylene, the pH value of the adjustment system is 10 by adding ammonia water with a mass fraction of 25%, and the dry material of polytetrafluoroethylene in the adjustment system is added with deionized water The mass content is 60% (based on the total mass of the system) to obtain a highly redispersible fluoroplastic aqueous dispersion.

Embodiment 3

[0038] A kind of preparation method of highly redispersible fluoroplastic aqueous dispersion liquid, with embodiment 1, difference is:

[0039] In step (2), add nonionic surfactant to polytetrafluoroethylene concentrated dispersion liquid, make nonionic surfactant content be 4.0% of polytetrafluoroethylene dry material quality, add water-soluble resin PVPK90, make The content of water-soluble resin PVPK90 is 0.1% of the mass of polytetrafluoroethylene dry material, adding mass fraction of 25% ammonia water to adjust the pH value of the system to 10, adding deionized water to adjust the mass content of polytetrafluoroethylene dry material in the system 60% (based on the total mass of the system), a highly redispersible fluoroplastic aqueous dispersion was obtained.

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Abstract

The invention provides a highly redispersible fluoroplastic aqueous dispersion and its preparation method and application. The main components of the fluoroplastic aqueous dispersion include polytetrafluoroethylene, water-soluble resin PVP, surfactant and deionized water; The content of the polytetrafluoroethylene is 30% to 70% of the mass of the fluoroplastic aqueous dispersion, and the polytetrafluoroethylene is calculated as a dry material; the content of the water-soluble resin PVP is 0.05% of the mass of the dry polytetrafluoroethylene. ~0.3%; the content of the surfactant is 2.5~4.0% of the mass of polytetrafluoroethylene dry material. The present invention greatly improves the redispersibility of the concentrated dispersion by reducing the content of the surfactant in the polytetrafluoroethylene concentrated dispersion and adding the water-soluble resin PVP at the same time, and the obtained dispersion has stable performance; the fluoroplastic prepared by the present invention is water-based The dispersion has good mechanical stability while having good redispersibility.

Description

technical field [0001] The invention relates to a highly redispersible fluoroplastic aqueous dispersion and its preparation method and application, belonging to the technical field of chemical synthesis. Background technique [0002] Concentrated polytetrafluoroethylene dispersion is obtained by heating and concentrating the dispersion prepared by dispersion polymerization of tetrafluoroethylene in the presence of an emulsifier to obtain a concentrated polytetrafluoroethylene dispersion, which has excellent corrosion resistance, weather resistance, and solvent resistance. , low friction coefficient, wear resistance, impact resistance, etc., can be used to impregnate porous materials such as asbestos, glass fiber, ceramics, graphite, etc., to form a film that shows excellent characteristics in chemical stability, non-adhesion, weather resistance, etc. , can also be formulated into coatings, spun into polytetrafluoroethylene fibers, used as anti-sticking, anti-corrosion or sea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/05C08L27/18C08L39/06C09D127/18D06M15/256
Inventor 王佰春陈越付师庆王莹
Owner SHANDONG DONGYUE POLYMER MATERIAL