Cellulose acetate butyrate in 2K acrylic urethane wood coatings Improving application and appearance ADD-COAT-7963

Transcription

1 Cellulose acetate butyrate in 2K acrylic urethane wood coatings Improving application and appearance ADD-COAT-7963

2 Table of Contents Segment Overview Slide 13 Segment Challenges Addressed by CAB Slide 15 Results Slide 24 Conclusion Slide 39

3 Agenda Cellulose esters overview Applications and desired attributes in wood coatings French wood association FCBA (formerly CTBA) evaluation of CAB in 2K top coats for furniture Improving application and appearance Addressing challenges in wood coatings Cellulose esters benefits over nitrocellulose in wood coatings 3

4 Introduction to cellulose esters Eastman supplies free flowing powders Produced from renewable sustainable raw materials CAB/CAP solution Eastman cellulose esters come from renewable sources and have unique properties that enhance the application and aesthetics of woo coatings

5 Cellulose esters A product of the reaction between organic acids and anhydrides with cellulose Acetic acid/anhydride Butyric acid/anhydride Propionic acid/anhydride Cellulose acetate (CA) Cellulose acetate butyrate (CAB) Cellulose acetate propionate (CAP) 5

6 Code designation Eastman cellulose acetate butyrate CAB Cellulose acetate butyrate Approximate butyryl content at triester stage (wt%) Falling-ball viscosity (s) Number of oh-groups per four anhydroglucose units Use solubility and molecular weight details for effective formulation and solvent choices 7

7 Chain packing CA vs CAB Acetate molecule Butyrate molecule Understanding chain packing impacts solubility parameters and solvent choice 8

8 Eastman portfolio of cellulose esters Cellulose acetate (CA) CA 394-LF CA CA CA CA Cellulose acetate propionate (CAP) CAP CAP CAP Cellulose acetate butyrate (CAB) CAB S CAB CAB CAB CAB CAB CAB CAB CAB CAB Solus 2100 Solus 2300 Solus 3050 CAB 381-2BP CAB CAB BP Eastman cellulose esters are available in a wide variety of formats and dispersions for versatility in use to achieve desired formulation and coatings attributes. 9

9 Segment Overview

10 Cellulose esters in wood coatings 2K acrylic urethane Acid cure Applications Radiation cure Desired attributes Unsaturated polyester Air-dry acrylics Improved productivity Improved appearance Improved safety 11

11 Segment Challenges Addressed by CAB

12 Improving productivity Early handling Early sandability Excellent block resistance With Eastman cellulose esters your dry cycle is shortened, resulting in increased productivity. 13

13 What if we can improve wood appearance? Cellulose esters significantly improved the appearance of the 2K acrylic urethane coating Improved pore definition for open pore effect Lower and more consistent gloss for equal matting aid loading Eastman CAB improves pore definition and gloss consistency, thus enhancing appearance 14

14 What if we can increase safety for coating producer and end user? Cellulose esters can be stored safely Cellulose esters are less flammable than the alternative nitrocellulose which is highly flammable CAB film burns slowly when ignited with a flame Nitrocellulose film burns explosively when ignited 15

15 Tuning the properties of wood coatings What if Increases Decreases Butyryl content of cellulose esters increases? Flexibility Solubility Hydrocarbon tolerance Chemical resistance Grease resistance Hardness Hydroxyl content of cellulose esters increases? Compatibility Water tolerance Moisture resistance Alcohol tolerance Alcohol resistance Hardness Reactivity Melting point Compatibility (very slightly) Cellulose ester viscosity increases? Toughness Solubility (slightly) Solution non volatile at fixed viscosity Cellulose esters are versatile problem solvers that offer formulators many options to achieve desired application and coating attributes 17

16 Results - The role of CAB in wood coatings - The advantages of CAB and CAP versus nitrocellulose in wood coatings

17 The role of CAB in wood coatings

18 Benefits of using CAB in wood coatings Cost effective Early handle ability Early sand ability Longer pot life Fast drying time Easy application Improved application Improved rheology Longer pot life Viscosity control Safe to use Improved appearance Clear and transparent coating Great anfeurerung of wood Gloss control Improved wetting Improved adhesion Non-yellowing The versatility of Eastman cellulose esters makes them an ideal choice to address common application and appearance standards for wood coatings. 21

19 Types used in 2K acrylic PU formulations CAB Co-resin CAB Co-resin CAB Additive CAB Additive Solus 2100 Co-resin for high solids 22

20 FCBA* evaluation of CAB in wood coatings Several years ago Eastman worked with the French wood association FCBA (formerly CTBA Centre Technique Du Bois et de L Ameublement in Paris) who performed an independent study into the role of CAB in a 2K acrylic urethane furniture coating. The study looked at the following; Appearance Hardness development Gloss control Adhesion *FCBA: French Institute of Technology for forest based and furniture sectors 23

21 Formulations Ingredient Manufacturer A. Control B. 5.8% CAB 381 C. 9.7% CAB D. 2.4% CAB (no CAB) 0.5* Desmophen A450 (50%) Bayer CAB Eastman CAB Eastman MEK Ethyl acetate Butyl acetate Toluene Zinc stearate (20% EA:tol 1:1) Acronal 4L (10% EA) BASF Syloid ED30 Grace Lanco wax PP1362 D Lubrizol Total PART A Mixing ratio Part A Desmodur N75 (BA:EA 1:1) Bayer PM acetate to 20 secs Din Calculated solids content (%) *Formulation with 5.8% CAB was used as a common base-coat for all formulations

22 Application The device used to apply products was Airmix gun with following parameters: Pump nozzle : Air pressure: 1,5 bar for basecoat and 1,2 bar for topcoat. (The air pressure is adapted to the product) Product pressure: 30 bar The aim was to apply about 100 g/m 2 wet on each sample. 25

23 Substrates evaluated Particle board veneered beech pre-sanding with Abranet P 180 grit paper Solid oak and particle board veneered oak pre-sanding with Abranet P 180 grit paper Particle board veneered maple pre-sanding with Abranet P 220 grit paper Glass panels (for hardness development testing) 26

24 Performance testing Post conditioning Hardness development (according to NF EN ISO 1522) Gloss (according to NF EN ISO 2813) Adhesion (according to NF EN ISO 2409) 27

25 Hardness development (Persoz) initial 24 hours Persoz hardness (seconds) Time (hours from application) An increase of CAB results in a harder film much more quickly than is possible with the acrylic control. 28 Tested by FCBA according to NF EN ISO 1522

26 Hardness development (Persoz) 18 days Persoz hardness (seconds) 29 Tested by FCBA according to NF EN ISO 2813 Time (hours from application) Within hours, Eastman CAB enable the same level of hardness development as what is achieved in nearly 18 days using the acrylic control.

27 Open-pore wood effects No CAB solids content is too high at application viscosity to flow evenly into wood pores With CAB solids content is perfect at application viscosity, resulting in improved appearance. 30

28 Effect of CAB on appearance Visual assessment The FCBA rated the appearance of the coatings as 5.8% CAB>9.7%>2.4%>>Control. The coating with higher levels of CAB were more even and gave an excellent open pore/grain effect. A (0% CAB) B (5.8% CAB) With CAB, flow and leveling is improved allowing for an even and consistent appearance. 31

29 Gloss CAB gave a much more even and lower gloss for equivalent loading of matting aid Tested 32 by FCBA according to NF EN ISO 2813

30 Adhesion (ISO 2409) Each formulation was found to have excellent adhesion onto all substrates evaluated 33 *Tested by FCBA according to NF EN ISO 2409

31 Conclusions FCBA research The work by the FCBA confirmed the following; CAB significantly improved the appearance of the 2K acrylic urethane coating Improved pore definition for open pore effect Lower and more consistent gloss for equal matting aid loading Much improved hardness development particularly at the critical early stages after application Excellent adhesion to veneered and solid wood substrates 34

32 Advantages of CAB and CAP vs nitrocellulose in wood coatings

33 Benefits Cost effective Early handle ability Early sandability Longer pot life Testing results of hardness development of coating with CAB (according to NF EN ISO 1522) 36

34 Comparison of structure CAB vs NC Nitrocellulose (NC) Cellulose acetate butyrate (CAB) Based on cellulose; CAB has improved heat and UV stability 37

35 CAB and CAP vs nitrocellulose in wood coatings Advantages Improved appearance Non-yellowing coating Clear and transparent coating Cost effective Lower density, higher yield Easy to store and handle Safe to use and store Eastman cellulose esters are a safe, cost effective alternative to nitrocellulose that yield results with improved application and appearance. 38

36 Non-yellowing effect of UV exposure Effect of UV exposure after 18 hours Effect of UV exposure after 6 months CAB/acrylic NC/acrylic Tested by Eastman (QUV(B) Tested by Eastman (Florida exposure) With Eastman cellulose esters, coatings retain the integrity of the original wood color, allowing them to be used on a variety of wood types. 39

37 Safe to apply Flammability CAB film burns slowly when ignited with a flame. Nitrocellulose film burns explosively when ignited. 40

38 Conclusion

39 Conclusions Viscosity control Longer pot life Improved evenness and consistency Improves application Good adhesion Improves appearance Non-yellowing Improved rheology Improved poor definition Safe storage and application Cellulose esters are less flammable than the alternative nitrocellulose which is highly flammable. 42

40 Disclaimer Although the information and recommendations set forth herein are presented in good faith, Eastman Chemical Company makes no representations or warranties as to the completeness or accuracy thereof. You must make your own determination of their suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. Nothing contained herein is to be construed as a recommendation to use any product, process, equipment, or formulation in conflict with any patent, and we make no representations or warranties, express or implied, that the use thereof will not infringe any patent. NO REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS OR IMPLIED, OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR OF ANY OTHER NATURE ARE MADE HEREUNDER WITH RESPECT TO INFORMATION OR THE PRODUCT TO WHICH INFORMATION REFERS AND NOTHING HEREIN WAIVES ANY OF THE SELLER S CONDITIONS OF SALE. Safety Data Sheets providing safety precautions that should be observed when handling and storing our products are available online or by request. You should obtain and review available material safety information before handling our products. If any materials mentioned are not our products, appropriate industrial hygiene and other safety precautions recommended by their manufacturers should be observed Eastman Chemical Company. Eastman, Solus, Optifilm, Eastek and The results of insight are trademarks of Eastman Chemical Company. 43