Liquid composition, method for producing same and method for producing membrane electrode assembly
A technology of membrane electrode assembly and liquid composition, which is applied in the direction of battery electrodes, solid electrolytes, final product manufacturing, etc., can solve the problems of easy breakage and brittleness, and achieve the effect of not easy breakage
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[0237] Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these examples.
[0238] Examples 1-6 are examples, and Examples 7-14 are comparative examples.
[0239] It should be noted that polymer F-6 and polymer F-7 in the comparative example are not "polymer (F)" in this specification, and polymer H-6 and polymer H-7 are not "polymer (F)" in this specification. "Polymer (H)".
[0240] (density)
[0241] The density of the polymer (F) was determined using an electronic pycnometer (manufactured by ALFA MIRAGE, MD-300S) using an underwater displacement method. Specifically, after measuring the mass of the polymer (F) in the air, the polymer (F) was submerged in 20° C. water to measure the mass. The specific gravity in water at 20° C. was obtained from these masses, and was further converted into the specific gravity in water at 4° C. as a density.
[0242] (ion exchange capacity)
[0243] The ion exchange...
example 1
[0290] Step (1): A mixed solvent of 1-propanol and water (1-propanol / water=70 / 30 mass ratio) was added to the polymer (H-1) to obtain a polymer having a solid content concentration of 22% by mass. Mixture.
[0291] Step (2): Use an autoclave at a temperature of 115°C and a shear rate of 100s-1 Stir the mixture down. After 3 hours, the viscosity of the mixed liquid rose to 7 times, and then decreased to the original viscosity in about 30 minutes, thereby stabilizing.
[0292] Step (3): After 8 hours from the start of stirring, water was added to the mixed solution to adjust the solid content concentration to 16% by mass to obtain a liquid composition in which the polymer (H-1) was dispersed in the dispersion medium.
[0293] Film breakability was evaluated using the resulting liquid composition. The results are shown in Table 2.
example 2～14
[0295] A liquid composition was obtained in the same manner as in Example 1 except that the kind of the polymer (H) and the conditions of the steps (1) to (3) were those shown in Table 2 and the conditions. Film breakability was evaluated using the resulting liquid composition. The results are shown in Table 2.
[0296] [Table 2]
[0297]
[0298] The X-ray small-angle scattering (SAXS) scattering pattern obtained for the liquid compositions of Example 1, Example 2, and Example 7 is shown in image 3 .
[0299] In Example 7, since the solid content concentration of the polymer (H-1) in the mixed solution in the step (1) was too low, no increase in the viscosity of the mixed solution was observed in the step (2). The primary particle diameter parameter of the polymer (H-1) in the obtained liquid composition was smaller than the primary particle diameter parameter of the polymer (H-1) in the liquid composition of Example 1, and in the evaluation of the film rupture propert...
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