TH60026B - Coating admixtures for electrostatically coated metal sheets and pre-coated metal sheets - Google Patents

Abstract

DC60 (28/02/17) This invention provides a PCM capable of suppressing the coating charge by static electricity. reliably without the huge cost increase in PCM where the coating is provided on at least one face of sheet metal Static problems at room temperature or at 70°C are suppressed by the PCM with the charged voltage generated when the PCM is charged by stripping at room temperature or at 70°C. less than 15 kV or less than 0.25 kV, respectively, by including in the isocyanate derivative coating, in particular isophorone diisocyanate at the ratio of Derivatives to total solids less than 5% or together with isocyanate derivatives, alkoxyamine salts in a ratio of at least 1% to total solids. The electric charge after stripping electric charge can be reduced. Revised 28/02/2017 This invention provides a PCM capable of suppressing the coating charge by static electricity. reliably without the huge cost increase in PCM where the coating is provided on at least one face of sheet metal Static problems at room temperature or at 70 °C are suppressed by the PCM with the charged voltage generated when the PCM is charged by stripping at room temperature or at 70 °C. less than 15 kV or less than 0.25 kV, respectively, by including in the isocyanate derivative coating, in particular isophorone diisocyanate at the ratio of Derivatives to total solids less than 5% or together with isocyanate derivatives, alkoxyamine salts in a ratio of at least 1% to total solids. The electric charge after stripping electric charge can be reduced. -------------------------- This invention provides a PCM capable of electrostatically suppressing the coating charge without the huge cost increase in PCM. The coating is provided on at least one face of the sheet metal. Problems due to static electricity at room temperature or at 70 °C are suppressed by the PCM with the correct voltage. The charge generated when the PCM is charged by stripping at room temperature or at 70 °C in one of two approaches to less than 15 kV or less than 0.25 kV, respectively, by inclusion in an isocyanate derivative coating. especially isophorone diisocaya. net at the ratio of the derivative to Total solid content is less than 5% or together with isocyanate derivatives, alkoxy-amine salts in a ratio of at least 1% to solids content. charge by peeling can be reduced

Claims (8)

Disclaimer (all) which will not appear on the announcement page: EDIT 28/02/2017 1. Coating Compound for Electrostatic Problems Pre-coated Metal Sheet Coating Compound for Sheet Manufacturing Metals pre-coated by coating and Curing on sheet metal is a film. The coating of the upper surface layer is characterized by the addition of Perrysodactyl resins and hardeners selected from (1) mixtures of high polymer polymer resins and melamine hardeners, (2 A) mixtures of high polymer polyesters resin and phenolic hardeners and (3) mixtures of acrylic resins and melamine hardeners. And contains an isocyanate derivative of 5 to 15% of the total solids of the coating mixture; 2. Coating admixtures for pre-coated metal sheets that are resistant to electrostatic problems as requested in the claim. Where 1 to 2% of the total solids of Alkocyamine Salts 3. Coating Compound for Pre-coated Metal Plates Resist to Electrostatic Problems as Claimed Claim No. 1, where Isophoronic Diisocyte Derivatives Yarnate (IPDI) is available as an isocyanate derivative 4. Coating compound for pre-coated metal sheets that are resistant to electrostatic problems, as claimed in claim 1, where, when sheet metal That are pre-coated that form layers The above surface is measured by Method 1, mentioned below. The derived value of the voltage To produce an electric charge of less than 0.15 kV (method 1) indoors in standard conditions (23 ํ temperature and 50% relative humidity), a 5x10 cm cut-out chloroprene rubber sheet, with a hardness of 50, With 31% activated carbon content and with a thickness of 5 mm was placed on top at the center of the coated face. Smooth cut to size 7x15 cm. This assembly is placed on a horizontal ceramic table with a metal plate. A 1 kg weight was put on a 10 sec chloroprene rubber sheet to bond. The rubber sheet and metal plate were pre-coated, then the weight was removed. And chloroprene rubber sheet Is peeled off in a vertical direction after the electrically charged voltage at the center of the The coatings of the pre-coated metal plates were measured immediately by a non-contact field meter 5. Coating mixtures for the pre-coated metal sheets that are resistant to electrostatic problems as claimed in claim 1, where When a pre-coated metal sheet forms a layer The above surface is measured using Method 2, mentioned below. The derived value of the voltages in Less than 0.25 kV (method 2), pre-coated metal plates, chloroprene rubber sheets, ceramic tables and weights referred to in Method 1 of claim 4 were assumed. Heated for 10 minutes in the oven where the temperature was 70 ํ and after removing it. All processes in Method 1 were completed within 30 seconds. 6. Pre-coated metal sheets were produced by coating. And curing the coating mixture Referred to in any of the claims 1, 2, 3, 4 and 5 is the top surface layer, with at least One surface of a metal plate -------------------------- 1.Coating compound for pre-coated metal sheets that are resistant to problems caused by static electricity. Produce sheet metal that is pre-coated by coating and curing it on the sheet as a top coat. Mixture of such coating That set the characteristics in At that the value of the charged voltage The results obtained when measuring such pre-coated metal sheets by "Method 1" described below are less than 0.15 kV: (Method 1) Indoor in standard conditions (23 ํ temperature and 50% relative humidity), Chloroprene rubber, cut into size 5x10 cm, with a hardness of 50, with a content of 31% activated carbon and with a thickness of 5 mm, is placed on top at the center of the surface. The page was coated on the target of the metal sheet that was Pre-coated Flat model cut to dimensions of 7x15 cm. Vertical ceramic table A weight of 1 kg was put on a 10 sec chloropene rubber sheet to bond the rubber sheet with the pre-coated metal sheet. The weight was then removed and the chloroprene rubber sheet. Am peeled off in a vertical direction After the pressure Centered electric charge Of the surface being coated. The pre-coated metal sheets were measured immediately by a non-contact field meter. 2.Coating compound for pre-coated metal sheets at Resists problems due to static electricity. Produce sheet metal that is pre-coated by coating and curing it on the sheet metal as a top coat, compound such coating. That define the characteristics in that The value of the charged voltage at Yes, when the pre-coated metal sheet was measured by "Method 2" described below, less than 0.25 kV: (Method 2). Chloroprene rubber sheet, ceramic table, and weight described in Method 1 of claim 1 were heated in an oven for 70 ํ 10 minutes and then removed after the process described in Clause 1. Method 1 is complete in 30 seconds. 3.Coating compound for pre-coated metal sheets as Clarified in Clause 1 or 2 that define specific characteristics in That the coating mixture contains isocyanate derivatives 4.Coating compound for pre-coated metal sheets as Clarified in Clause 1 or 2 that define specific characteristics in That the coating mixtures are only available with isocyanate derivatives and alkoxyamine salts. 5.Coating compound for pre-coated metal sheets As stated in Clause 3 or 4 that define specific characteristics By the presence of isocyanate derivatives and isophoronic diisocyanate (IPDI) derivatives. 6.Coating compound for pre-coated metal sheets Explained in Clause 5, which specifies the characteristics in that The ratio of isophoronic diisocyanate (IPDI) to total solid content is less than 5%. 7.Coating compound for pre-coated metal sheets As described in Clause 4 to 6, any one defines the characteristics in that the ratio of aldoxamine to Solid content The total is less than 1%. 8.Pre-coated metal sheets produced by coating and Curing the coating mixture as described in Clause 1 to 7, any one On at least one surface of the sheet metal is the top coat.