KR930700579A - Stable polyamide resin microdispersion and preparation method thereof - Google Patents

Abstract

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Description

Stable polyamide resin microdispersion and preparation method thereof

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Claims (29)

(a) mixing polyamide resin, water, one or more surfactants, one or more cosurfactants and neutralizing acids or smokes together at a first temperature to form a water-in-oil emulsion, wherein the water and the surfactants are water-in-oil An amount is present in an amount effective to form an emulsion, the cosurfactant is present in an amount effective to form an aqueous microdispersion, and the acid or base for neutralization is an amount effective to neutralize residual acids or bases present in the polyamide resin. The first temperature is effective to liquefy the polyamide resin and maintain the oil phase of the water and oil emulsions as a liquid) and (b) a second amount of water and water-in-oil emulsions effective to form an oil-in-water emulsion. Mix together at a second temperature and cool the oil-in-water emulsion to a third temperature effective to form an aqueous microdispersion, followed by one or more water-soluble dipolar chemicals The water soluble dipolar chemical is then added to the aqueous microdispersion in an amount effective to stabilize the aqueous microdispersion or at a second temperature in an amount of amino acids of the following general formula or anionic salts or cationic salts thereof or mixtures thereof). A method for producing a stable aqueous microdispersion of a polyamide resin, comprising the steps of adding to the heavy oil emulsion to form an aqueous microdispersion. Wherein R is an alkylene, alkenylene or arylene group having 10 or less carbon atoms, and Y is a polar or nonpolar, ionic or nonionic substituent. (a) heating the polyamide resin to a first temperature substantially at least as high as its melting point in the absence of oxygen to liquefy the resin, (b) a liquefied resin, a first amount of water effective to form a homogeneous mixture, One or more surfactants in an amount effective to form water-in-oil emulsions and one or more cosurfactants in an amount effective to form aqueous microdispersions are mixed together at a second temperature effective to maintain the water and oil emulsion as a liquid in the oil phase. Forming a homogeneous mixture of liquid polyamide resin, water, one or more surfactants and one or more cosurfactants, (c) a second amount of water effective to form a water-in-oil emulsion, wherein the second amount of water Mixing the acid or base in an amount effective to neutralize residual acids or bases present in the polyamide resin) with a homogeneous mixture, (d) A third amount of water effective to form the emulsion, wherein the third amount of water comprises one or more water soluble dipolar chemicals in an amount effective to stabilize the aqueous microdispersion, the water soluble bipolar chemicals being The amino acid of the formula or an anionic salt or cationic salt thereof or a mixture thereof, at a third temperature, wherein the third temperature is at least about 50 ° C. of the softening point of the polyamide resin, although the third temperature is above the melting point of the oil and below the softening point of the polyamide resin And (e) cooling the oil-in-water emulsion to a fourth temperature below the melting point of the oil phase to form an aqueous microdispersion, thereby obtaining a stable aqueous microdispersion liquid of the polyamide resin. How to make. Wherein R is an alkylene, alkenylene or arylene group having 10 or less carbon atoms, and Y is a polar or nonpolar, ionic or nonionic substituent. (a) a polyamide resin, a first amount of water effective to form a mixture, an amount effective to form a water-in-oil emulsion upon liquefaction of the polyamide resin, and an amount effective to form an aqueous microdispersion Mixing at least one cosurfactant to form a mixture of polyamide resin, water, surfactant and cosurfactant, (b) at least the melting point of the oil and oil emulsions of water and oil emulsion, effective to liquefy the polyamide resin in the mixture Heating the mixture to a first temperature to form a homogeneous mixture of liquefied polyamide resin, water, one or more surfactants and one or more cosurfactants, (c) the homogeneous mixture effective to form a water-in-oil emulsion A second amount of water, where the second amount of water contains an amount of acid or base effective to neutralize residual acids or bases present in the polyamide resin. Mixing (d) with a homogeneous mixture, (d) a third amount of water effective to form an oil-in-water emulsion, wherein the third amount of water is one or more pairs in an amount effective to stabilize the aqueous microdispersion A polar chemical, wherein the water-soluble bipolar chemical is an amino acid of the following general formula or an anionic salt or cationic salt thereof or a mixture thereof, at a second temperature, wherein the second temperature is above the melting point of the oil polyamide Mixing the water-in-oil emulsion at a temperature below the softening point of the resin but below about 50 ° C. of the polyamide resin) and (e) cooling the oil-in-water emulsion to a third temperature below the melting point of the oil to form an aqueous microdispersion. A method of producing a stable aqueous microdispersion of a polyamide resin, including one after the other. Wherein R is an alkylene, alkenylene or arylene group having 10 or less carbon atoms, and Y is a polar or nonpolar, ionic or nonionic substituent. The method of claim 1, wherein the amount of surfactant effective to form the water-in-oil emulsion is from about 0.05 to 10% by weight, based on the weight of the polyamide resin. The method according to any one of claims 1 to 4, wherein the cosurfactant is an alcohol having 10 or less carbon atoms. The method of claim 5, wherein the cosurfactant is isopropyl alcohol. The method of claim 1, wherein the amount of cosurfactant effective to form the aqueous microdispersion is from about 10 to about 40 weight percent based on the weight of the resin. 8. The method of any one of claims 1 to 7, wherein the water soluble dipolar chemical is p-aminobenzoic acid or glycine. 9. The method of claim 1, wherein the amount of water soluble dipolar chemical effective to stabilize the aqueous microdispersion is from about 0.25 to about 3.0 weight percent based on the weight of the polyamide resin. 10. The method of any one of claims 1-9, wherein the water-in-oil emulsion comprises about 5 to about 50 weight percent water. The process of claim 1, wherein the oil-in-water emulsion comprises about 20 to about 60 weight percent polyamide resin. The method of claim 1 wherein the first temperature is as high as at least the melting point of the oil phase. The method of claim 1 wherein the second temperature is at least about the melting point of the polyamide resin but at most about 50 ° C. of the softening point of the polyamide resin. The method of claim 1 wherein the third temperature is below the oil point. 15. Obtained by the method of any one of claims 1 to 14 and comprising at least one surfactant, at least one cosurfactant and a water soluble dipolar chemical of the following general formula or an anionic or cationic salt thereof or mixtures thereof A stable aqueous microacid solution of polyamide resin particles in water comprising a phosphorus stabilizer. Wherein R is an alkylene, alkenylene or arylene group having 10 or less carbon atoms, and Y is a polar or nonpolar, ionic or nonionic substituent. The aqueous microdispersion according to claim 15, wherein the volume average size distribution of the solid dispersed resin particles is less than about 1,000 nm. The aqueous micro-acid solution according to claim 16, wherein the volume average size distribution is about 10 to 400 mm. 18. The aqueous microdispersion of claim 17, wherein the volume average size distribution is about 100-150 mm. 19. The aqueous microdispersion of claim 15 comprising from about 20 to about 60 weight percent polyamide resin and about 30 to about 70 weight percent water. 20. A transparent continuous membrane formed from the aqueous microdispersion of any one of claims 15-19 at ambient temperature or near ambient temperature. ※ Note: The disclosure is based on the initial application.