摘要:
The invention concerns to the use of a powder comprising 99.95 to 95% of at least one polyamide and 0.05 to 5% of at least one silane for coating metals. This powder may be prepared by simple dry blending of the constituents. The silane can also be added to the molten polyamide in a mixing device and the resulting product reduced to powder. The addition of silane makes it possible to significantly improve electrostatic application by preventing a substantial portion of the powder from falling off during the electrostatic discharge which follows application, while providing lasting adhesion between the coating and metal. Advantageously, the silane is chosen from aminopropyltriethoxysilane and aminopropyltrimethoxysilane. The invention also concerns a method of coating an object with a film resulting from melting a thin layer of the powder.
摘要:
The invention concerns to the use of a powder comprising 99.95 to 95% of at least one polyamide and 0.05 to 5% of at least one silane for coating metals. This powder may be prepared by simple dry blending of the constituents. The silane can also be added to the molten polyamide in a mixing device and the resulting product reduced to powder. The addition of silane makes it possible to significantly improve electrostatic application by preventing a substantial portion of the powder from falling off during the electrostatic discharge which follows application, while providing lasting adhesion between the coating and metal. Advantageously, the silane is chosen from aminopropyltriethoxysilane and aminopropyltrimethoxysilane. The invention also concerns a method of coating an object with a film resulting from melting a thin layer of the powder.
摘要:
The present invention concerns a process for preparing a polymer nanocomposite composition, the process comprising: a) mixing a melted polyamide of inherent viscosity under 1 and a nanofiller to disperse the nanofiller in said polyamide; and b) subjecting the previous mixture to polymerization conditions to polymerize the polyamide and to form the polymer nanocomposite composition. Advantageously the inherent viscosity of the polyamide is under 0.9 and preferably between 0.4 and 0.8. Step a) is carried out in an extruder or a mixer. Advantageously a mono or twin-screw extruder is used. Step b) could be made either in melted state or in solid state. It is easier to make it in the same apparatus as step a). Should step a) is carried out in an extruder, step b) is made in the same extruder. Polymerization of step b) can be carried with a catalyst and/or by having the extruder zones in which step b) takes place to operate under vacuum.
摘要:
The present invention relates to the use of a powder for coating articles, this powder comprising, by volume, 99 to 65% of at least one thermoplastic polymer and 1 to 35% of beads of a material that retains its initial shape at the processing temperatures for obtaining the coating. This powder may be prepared by simply dry-blending the constituents. The invention also relates to this powder. The invention relates in particular to rough coatings obtained from powders, for a dishwasher basket, which contain solid or hollow glass or ceramic beads added by dry-blending them with the polyamide powder. Because of their roughness, these coatings improve the drying in dishwashers. The addition of glass beads furthermore improves the quality of the fluidization.
摘要:
The invention provides a self-adhesive composition in powder form for the coating of metallic substrates, composed of homopolyamide (A) selected from PA11 and PA12, copolyamide (B), calcium carbonate and, optionally, at least one component selected from a pigment or dye, an anti-crater agent or spreading agent, a reductant, an antioxidant, a reinforcing filler, a UV stabilizer, a fluidizing agent and a corrosion inhibitor, said composition being devoid of silane-type adhesion promoter or of an adhesion promoter containing an epoxy, alcohol and/or carboxylic acid function, or derivatives thereof, and having a dry-state modulus and/or a wet-state modulus of greater than or equal to 2200 MPa [Standard NF EN ISO 527]. The invention also relates to a composite material comprising a metallic substrate directly coated with a coating film resulting from the melting of said composition, the adhesion of the coating film to the metallic substrate being greater than 3 after 2000 hours of salt fog before and after drying, in accordance with Standard NFT 58-112.
摘要翻译:本发明提供了一种用于涂覆金属基材的粉末形式的自粘组合物,其由选自PA11和PA12的均聚酰胺(A),共聚酰胺(B),碳酸钙和任选的至少一种选自颜料或 染料,抗火山口剂或铺展剂,还原剂,抗氧化剂,增强填料,UV稳定剂,流化剂和腐蚀抑制剂,所述组合物不含硅烷型粘合促进剂或含有 环氧,醇和/或羧酸官能团或其衍生物,并且具有大于或等于2200MPa的干态模量和/或湿态模量[标准NF EN ISO 527]。 本发明还涉及一种复合材料,其包括直接涂覆有由所述组合物熔化产生的涂膜的金属基材,在干燥前后的盐雾后2000小时后,涂膜对金属基材的粘附性大于3 ,符合NFT 58-112标准。
摘要:
The invention provides a self-adhesive composition in powder form for the coating of metallic substrates, composed of homopolyamide (A) selected from PA11 and PA12, copolyamide (B), calcium carbonate and, optionally, at least one component selected from a pigment or dye, an anti-crater agent or spreading agent, a reductant, an antioxidant, a reinforcing filler, a UV stabilizer, a fluidizing agent and a corrosion inhibitor, said composition being devoid of silane-type adhesion promoter or of an adhesion promoter containing an epoxy, alcohol and/or carboxylic acid function, or derivatives thereof, and having a dry-state modulus and/or a wet-state modulus of greater than or equal to 2200 MPa [Standard NF EN ISO 527]. The invention also relates to a composite material comprising a metallic substrate directly coated with a coating film resulting from the melting of said composition, the adhesion of the coating film to the metallic substrate being greater than 3 after 2000 hours of salt fog before and after drying, in accordance with Standard NFT 58-112.
摘要翻译:本发明提供了一种用于涂覆金属基材的粉末形式的自粘组合物,其由选自PA11和PA12的均聚酰胺(A),共聚酰胺(B),碳酸钙和任选的至少一种选自颜料或 染料,抗火山口剂或铺展剂,还原剂,抗氧化剂,增强填料,UV稳定剂,流化剂和腐蚀抑制剂,所述组合物不含硅烷型粘合促进剂或含有 环氧,醇和/或羧酸官能团或其衍生物,并且具有大于或等于2200MPa的干态模量和/或湿态模量[标准NF EN ISO 527]。 本发明还涉及一种复合材料,其包括直接涂覆有由所述组合物熔化产生的涂膜的金属基材,在干燥前后的盐雾后2000小时后,涂膜对金属基材的粘附性大于3 ,符合NFT 58-112标准。