摘要:
The present invention provide a method for color matching of a thermosetting powder coating composition, the method comprising the steps of: (1) dryblending two or more kinds of starting colored thermosetting powder coating compositions of different colors having an average particle size of 20 &mgr;m or less to achieve color matching, and (2) granulating the dryblend to a particle size in the range suitable for powder coating, by heating and agitating the dryblend, or by adding a specific solid binder, or by grinding and classifying a sheet or grains formed by compressing the dryblend. According to the present invention, color matching can be easily made, and a color-matched powder coating composition is obtained which is excellent in application characteristics, finished appearance and film properties.
摘要:
This invention provides a method for color matching of a thermosetting powder coating composition, the method comprising the steps of: dryblending two or more kinds of starting colored thermosetting powder coating compositions of different colors having an average particle size of 10 &mgr;m or less to achieve color matching, and granulating the dryblend to a particle size in the range which is suitable for coating, by adding at least one binder selected from the group consisting of an aqueous solution of polyethylene glycol and an aqueous dispersion of paraffin wax; and a production process therefor. According to the present invention, color matching can be easily made, and a film of the obtained color-matched powder coating composition is excellent in finished appearance and outstanding in properties.
摘要:
A powder primer composition comprising as essential components (A) a carboxyl group-containing thermosetting polyester resin, (B1) a bisphenol A-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (B2) a bisphenol-type epoxy resin with an epoxy equivalent of 400-2000 g/eq and (C1) a bisphenol F-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (C2) a modified epoxy resin containing phenolic hydroxyl groups, obtained by reacting (a) a bifunctional epoxy resin with (b) an excess of a bifunctional phenol. Coating films obtained using the powder primer composition have excellent finished appearance and corrosion resistance.
摘要:
The present invention provides a method for forming a topcoat according to a 2-coat 1-bake system comprising the steps of applying to a substrate a thermosetting aqueous colored base coating composition, applying to the uncured surface of the base coat a clear coating composition, and curing the two coats by heating, wherein the clear coating composition is a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing acid anhydride (a) represented by formula X—COO—[CO—(CH2)m—COO]n—CO—X (1) and at least one species selected from the group consisting of acid anhydride (b) represented by the formula HO—[CO—(CH2)p—COO]q—H (2) and dibasic acid (c).
摘要:
The invention provides a thermosetting powder coating composition comprising (A) a vinyl copolymer having a number average molecular weight of 1,500 to 6,000, a molecular weight distribution of 1.0 to 1.5 as represented by a weight average molecular weight/a number average molecular weight and a glass transition temperature of 40 to 100.degree. C., the copolymer containing at least one species of functional group selected from the class consisting of epoxy group, carboxyl group and hydroxyl group, and (B) a curing agent. The thermosetting powder coating composition of the invention is superior in any of the finished appearance of coating film and the blocking resistance.
摘要:
The present invention provides an aqueous coating comprising: (A) a resin having hydroxyl group and carboxyl group in the molecule, (B) an alkyl-etherified methylolmelamine resin, and (C) an oxazoline group-containing compound. This aqueous coating can alleviate the problems of conventional aqueous coatings comprising (a) a resin having hydroxyl group and carboxyl group and (b) an alkyl-etherified methylolmelamine resin.
摘要:
A powder primer composition comprising as essential components (A) a carboxyl group-containing thermosetting polyester resin, (B1) a bisphenol A-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (B2) a bisphenol-type epoxy resin with an epoxy equivalent of 400-2000 g/eq and (C1) a bisphenol F-type epoxy resin with an epoxy equivalent of 400-2000 g/eq or (C2) a modified epoxy resin containing phenolic hydroxyl groups, obtained by reacting (a) a bifunctional epoxy resin with (b) an excess of a bifunctional phenol. Coating films obtained using the powder primer composition have excellent finished appearance and corrosion resistance.
摘要:
The present invention provides an aqueous heat-resistant coating composition comprising: (A) an aqueous carboxy-containing acrylic-modified epoxy resin dispersion obtained by neutralizing a carboxy-containing acrylic-modified epoxy resin with a basic compound and dispersing the neutralized resin in an aqueous medium; (B) an inorganic coloring pigment; and (C) a rust-preventive pigment. The present invention further provides a process for applying the same.
摘要:
The present invention provides a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing acid anhydride (a) and at least one species selected from the group consisting of acid anhydride (b) and dibasic acid (c), the acid anhydride (a) being represented by formula X—COO—[CO—(CH2)m—COO]n—CO—X (1) wherein the two X's are the same or different and independently represent a C4-12 alkyl group having a branched structure, R1—O—CO—R2—, R1—CO—R2— or R1—CO—NH—R2— in which R1 is a C1-10 monovalent saturated hydrocarbon group; R2 is a C1-10 bivalent saturated hydrocarbon group; m is an integer of 6 to 18; and n is an integer of 8 to 50, the acid anhydride (b) being represented by the formula HO—[CO—(CH2)p—COO]q—H (2) wherein p is an integer of 6 to 18 and q is an integer of 2 to 18, and having carboxyl groups at both ends, the dibasic acid (c) being represented by the formula HOOC—(CH2)t—COOH (3) wherein t is an integer of 6 to 18, the molar ratio of carboxyl groups to acid anhydride groups in the curing agent being in the range between 0.15:1 and 2:1, and the molar ratio of the total of carboxyl groups and acid anhydride groups in the curing agent (B) to epoxy groups in the epoxy-containing resin (A) being in the range between 0.7:1 and 1.2:1. The present invention further provides a method for forming a topcoat according to a 2-coat 1-bake system comprising the steps of applying to a substrate a thermosetting aqueous colored base coating composition, applying to the uncured surface of the base coat a clear coating composition, and curing the two coats by heating, wherein the clear coating composition is the above-mentioned thermosetting powder coating composition.
摘要:
The present invention provides a thermosetting powder coating composition comprising: (A) an epoxy-containing resin; and (B) a curing agent containing, as an essential ingredient, an acid anhydride (a) represented by the formula HOOC—(CH2)m—[COO—CO—(CH2)m]n—COOR1 (1) wherein R1 represents a C1-10 monovalent saturated hydrocarbon group, m is an integer of 6 to 18, and n is a number of 1 to 20 on average, the molar ratio of carboxyl groups to acid anhydride groups in the curing agent being in the range from 0.15:1 to 2.0:1, the molar ratio of the total of carboxyl groups and acid anhydride groups in the curing agent (B) to epoxy groups in the epoxy-containing resin (A) being in the range from 0.7:1 to 1.2:1.