Method For Curing And Surface-Functionalizing Molded Parts

• US 20110311733A1
• Filed: 02/04/2010
• Published: 12/22/2011
• Est. Priority Date: 02/25/2009
• Status: Active Grant

• Current Assignee: Leibniz-Institut für Polymerforschung Dresden
• Original Assignee: Leibniz-Institut für Polymerforschung Dresden
• Inventors: Gedan-Smolka, Michaela, Gohs, Uwe, Mueller, Anett
• Granted Patent: US 10,113,042 B2
• Time in Patent Office: Days
• US Class Current: 427/551
• CPC Class Codes: C08J 7/04 Coating
• CPC Class Codes: C08J 7/08 Heat treatment
• CPC Class Codes: C08J 7/123 Treatment by wave energy or particle radiation C08J7/18 takes precedence
• CPC Class Codes: C08J 7/18 using wave energy or particle radiation

Abstract

The invention relates to the fields of chemistry and relates to a method for curing and surface modification of molded parts, which can be used, for example, in the automobile industry, in vehicle construction, in the electrical industry. The object of the present invention is to disclose a method which can be carried out in particular in a short time and with a high degree of reproducibility and leads to an improvement in the surface quality of the molded parts to be painted. The object is attained with a method in which materials containing at least one unsaturated radically or cationically curable reactive resin system are processed to form a molded part and during or after the molding process with or without coating are cross-linked up to dimensional stability, and during the cross-linking and/or subsequently, before and/or after a coating, the molded part is subjected to a processing by means of energetic radiation or energetic particles up to essentially complete curing at least of the surface region of the molded part.

Claims

1. A method for curing and surface functionalization of molded parts, in which materials that contain at least one unsaturated radically or cationically curable reactive resin system and further substances, are processed to form a molded part and during or after the molding process with or without coating are cross-linked up to dimensional stability, and during the cross-linking and/or subsequently, before and/or after a coating, the molded part is subjected to a processing by means of energetic radiation or energetic particles up to essentially complete curing at least of the surface region of the molded part and to the production of an essentially completely coatable molded part surface.

2. The method according to claim 1, in which molded parts are produced and subjected to a processing with energetic radiation or energetic particles, which are composed of a fiber reinforced polymer material.

3. The method according to claim 2, in which the fiber reinforced polymer materials are used, which are composed of unsaturated polyester resins or acrylic resins (acrylates, methacrylates) or epoxy resins with a cationic initiator.

4. The method according to claim 1, in which an unsaturated reactive resin system is used, which contains further substances.

5. The method according to claim 4, in which additives and/or fillers and/or reinforcing elements and/or further polymers and/or reactive thinning agents are used as further materials.

6. The method according to claim 1, in which the molded parts are used that are composed of SMC and/or BMC.

7. Method according to claim 1, in which the molded parts are molded by means of hot pressing.

8. The method according to claim 1, in which the cross-linking is thermally initiated.

9. The method according to claim 8, in which the cross-linking is carried out up to molded part stability.

10. The method according to claim 1, in which the processing by means of energetic radiation or energetic particles is carried out in a reactive gas environment and/or in air.

11. The method according to claim 1, in which the processing by means of energetic electrons, gamma radiation or infrared radiation or microwave radiation or induction input is carried out in combination with a plasma treatment.

12. The method according to claim 1, in which the processing is carried out exclusively with energetic electrons in a reactive gas environment and/or in air.

13. The method according to claim 1, in which the processing is carried out with doses in the range of 10 kGy to 250 kGy.

14. The method according to claim 1, in which the dose application is carried out in at least two steps with the same dose per treatment step.

15. The method according to claim 1, in which the dose application is carried out in at least two steps with a different dose per treatment step.

16. The method according to claim 1, in which the processing is carried out at temperatures of 5°

C. up to temperatures at which the thermal molded part stability of the materials is ensured.

17. Method according to claim 1, in which the processing is carried out on coated fiber polymer matrix molded parts.

18. Method according to claim 17, in which a painting is carried out as a coating.