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Chemical-resistant porous film

A porous membrane, chemical-resistant technology, applied in the field of porous membranes, can solve the problems of difficult-to-form materials, and achieve the effect of excellent chemical resistance and convenient operation.

Inactive Publication Date: 2006-11-01
DAICEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are various requirements for the porous membrane in aspects such as heat resistance, flexibility, hardness, color, ease of preparation, pore size, porosity, porous structure, price, strength and chemical properties, so it is generally difficult to select The constituent materials of all these requirements

Method used

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  • Chemical-resistant porous film

Examples

Experimental program
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Effect test

preparation example Construction

[0071] The method for preparing a porous membrane according to the present invention comprises the steps of: immersing a porous membrane substrate in a solution of a chemical-resistant polymer or a precursor thereof, or spraying or coating the solution onto a porous membrane substrate; and drying the obtained products, resulting in porous membranes covered with chemical-resistant polymers. When a chemical-resistant macromolecular precursor is used, for example, after performing coating and drying of a solution containing the precursor on a substrate, the preparation method further includes using at least one step of treating the dried article.

[0072] The precursor of the chemical-resistant polymer may be a monomer component (raw material) constituting the chemical-resistant polymer; an oligomer (reaction intermediate) produced by addition or polymerization of the monomer component to a certain extent ; and mixtures thereof. Specific examples of monomer components constitut...

Embodiment

[0094] The invention will be explained in more detail with reference to the following several examples, which in no way limit the scope of the invention. The average pore diameter and porosity of the films in Preparation Example 1 were determined by calculation according to the following methods. These mean pore sizes and porosity of the micropores observed at the front of the electron micrograph were determined, while the micropores observed later were excluded from the measurement.

[0095] Average pore size

[0096] Select any 30 or more pores on the surface of the sample film observed in the electron micrograph, measure the area of ​​the selected pores, and define the average value as the average pore area S ave . Assuming the pores are perfect circles, the average pore area is converted to pore size (pore size) according to the following equation, and the converted value is defined as the average pore size. In the equation, π represents the ratio of the circumference o...

preparation example 1

[0106] Preparation of Porous Membrane Substrate 1

[0107] At 25°C, by adding 30 parts by weight of "VYLOMAX HR11NN" (trade name, available from Toyobo Co., Ltd.) to 100 parts by weight, the molecular weight is 5×10 4 of polyvinylpyrrolidone, to prepare a film-forming composition, "VYLOMAX HR11NN" is a solution of an amide-imide polymer in solvent NMP, and its surface tension as a polymer alone is 42 mN / m (=dyn / cm) (measured value), the solids content was 15% by weight, and the viscosity as a solution was 20 dPa.s. The film-forming composition was set at 25°C and cast using a film applicator to contain PET flakes (Model S, available from DuPont Teijin Films, Ltd., with a surface tension of 39 mN / m (=dyn / cm) (measured value) ) on the pad support. Immediately after casting, the cast article was placed in a container and kept at a humidity of about 100% and a temperature of 50°C for 4 minutes. The article is subjected to a phase transition by immersion in water, thereby curing...

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Abstract

A chemical-resistant porous film comprising a porous film substrate coated with a chemical-resistant polymeric compound, characterized in that the film has a multiplicity of micropores communicating with each other, the micropores having an average pore diameter of 0.01 to 10 mum. As the chemical-resistant polymeric compound, use can be made of, for example, a phenolic resin, a urea resin, a melamine resin, a benzoguanamine resin, a polyimide resin, an epoxy resin, a benzoxazine resin, a polypropylene resin, a polyurethane resin, a fluorinated resin, an alkyd resin, a cellulose acetate resin, a phthalic acid resin, a maleic acid resin, a silicon resin or the like.

Description

technical field [0001] The present invention relates to a porous membrane which is excellent in chemical resistance, contains substantially no surface layer (dense layer), and contains many continuous micropores. These porous membranes can often be used in membrane separation techniques such as microfiltration and separation / concentration by exploiting their pore properties or filling the pores with functional materials, or as a base for a variety of commonly used battery separators, electrolytic capacitors and circuit boards Material. Background technique [0002] As materials constituting the porous membrane, polymers such as amide-imide polymers, imide polymers, sulfone polymers, fluoropolymers, and olefin polymers are known. The porous film containing the material is prepared, for example, by a method (phase inversion method) in which a mixture containing a polymer is cast as a thin film and then introduced into a solidifying liquid. However, fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36B01D67/00B01D69/02B01D71/64H01M50/414H01M50/489H01M50/491
CPCB01D67/0009B01D67/0011B01D67/0013B01D67/0088B01D69/02B01D71/64B01D2325/02B01D2325/30Y10T428/249978Y10T428/249979Y10T428/249953Y02E60/10H01M50/491H01M50/414H01M50/489C08J9/36C08J9/22C08J5/18B01D2325/0283B01D71/641B01D67/00111
Inventor 大和洋露本美智男
Owner DAICEL CORP
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