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UMOH, VAGH vinyl resin
Yangguang resin Co., Ltd является наибольшим производителем виниловой смолы в Китае, мы производим такие типы смол как UMOH , UMCH которые заменяют смолы компании Dow UCAR VAGH ,VMCH . Наши терполимеры виниловой смолы и сополимеры виниловых смол имеют наилучшее качество среди производителей в Китае.YangGuang UMOH resinобладает высокими технологиями в области ПВХ сополимеров а также имеет сертификат ISO9001:2000 Системы Качества. Мы прошли рекистрацию FDA и имеем соответствующий сертификат. Годовой выпуск эквивалентов смол компании Dow VAGH , VMCH достигает 30,000 тонн/год. Наши смолы UMOH , UMCH широко экспортируются по всему миру.

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Typical Pigments for Carboxyl-Modified Vinyl Resins

If water is present in a pigmented coating containing a carboxyl-modified vinyl, the water molecule may form a bridge between the polymer’s carboxyl group and the pigment surface. Silica and alumina hydrate are prone to bridging or hydrogen bonding. Since most chloride- process TiO2 pigments have silica, zinc oxide, or alumina treatments, they can develop hydrogen bonding. Hydrogen bonding manifests itself as viscosity instability. The viscosity may increase slowly over a period of several months or it may increase rapidly in a few days or weeks. If the water content reaches two percent based on the weight of carboxyl-modified vinyl, the paint may even gel. Commercial-grade materials typically limit water content adequately and should introduce no serious viscosity instability. If water does contaminate the formulation, it may come from the solvents or be introduced through poor storage practices. Organic acids, mineral acids, and certain acid-esters will reverse bridging from excessive moisture. Organic acids (such as citric, maleic, or malonic) or mineral acids (such as phosphoric) are all effective at concentrations of one-fourth to one percent, based on the weight of the carboxyl-modified Vinyl Resin . To restore a gelled paint to fluidity, first prepare a solution of the acid or acid-ester in acetone or other compatible solvent. Then, slowly add the solution to the gelled paint with agitation. Acid treatment of the coating may, however, affect adhesion and reduce gloss. A small amount of acid or acid-ester can also prevent or minimize viscosity excursions during paint manufacture. As with the restoration of gelled paints, this treatment may also affect adhesion and reduce gloss. The best way to control viscosity aberrations from water content is to prevent water from entering the formulation.