Features of PTFE liquid aqueous dispersion

The Features of PTFE Liquid Aqueous Didspersion


The relationship between the relative density and solid content of PTFE Aqueous Dispersion

 

PTFE   solid content %

Relative   density

Solid   density g/L

35

1.24

430

40

1.29

515

45

1.34

601

50

1.39

695

60

1.51

906


PTFE dispersion is a colloidal emulsion. The polymer particles contained in the emulsion are less than 0.25um in size, and they are all negatively charged. The concentration required for the mixing ratio can be diluted with water to achieve the density corresponding to this concentration.


PTFE dispersions are generally alkaline, with a pH> 7, which is to suppress the growth and reproduction of bacteria during storage, especially in the case of partial heat or high humidity. At the same time, the dispersion contains non-ionic surfactants to improve the wettability of the dispersion and adjust the viscosity. At the sintering temperature of PTFE, they will decompose completely, most of the decomposition products are released in the form of gas, and there are only a few residual substances.

Many applications of dispersions require some other substances, which requires the addition of fillers, pigments, flowability improvers and other additives. For example, adding glass fiber as a filler can reduce the cold flow (creep) of the coating. All additives must be gently stirred to avoid PTFE agglomeration. For increasing the viscosity of the dispersion to maintain a uniform coating thickness during processing, a water-soluble thickener can be added, such as acrylonitrile polymer is a substance that can increase the viscosity of the dispersion. Another method of thickening is the addition of nonionic surfactants. This thickening method does not increase the viscosity to an unacceptable level. When the coating undergoes sintering, the thickener and surfactant will decompose into gas.

 

Following are our product specifications, hope to have a further discussion with you

 

Item

PTFE Aqueous Dispersion DF-301

Excellent Grade

 Appearance

Milky or yellow liquid

 PTFE Content, %

 60±2

 Particle Size(μm)


0.2

 PH Value

8.5~10.5

 Viscosity (25℃),(Pa.s)

(15-30)x10-3

 Content of case active agent

4~6

 For process

Coating and Impregnating