When you begin to compare the many forms and variations of epoxies, glues, and resins available today, the results may leave you scratching your head. One question often leads to another. The chemistry behind epoxy and the varying formulas of glue has come quite a long way over the years, and can be a bit intricate. So what is the difference between each product?
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Improved Saturated Polyester and Alkyd Coatings
One of the major drivers for innovation in the chemical industry today is sustainability. This not only relates to marketing claims, but will be a general trend in the industry for many years. This momentum toward sustainability can be used in such a way that a change in formulation also improves efficiency and product performance. A sustainable business can be depended upon by its customers to supply products now and in the future.
The megatrend toward making industry more sustainable has been translated by the coatings industry and legislative bodies into a number of measurable targets, such as CO2 carbon footprint and VOCs.
One way to achieve these targets is to incorporate renewable raw materials into coatings. These raw materials should not only contribute to a reduction of the CO2 footprint over the life cycle of the coating, but should also be cost-efficient and provide equal, or better, coating performance than petrochemical alternatives. This bio-based building block provides the desired CO2 reduction, is available on an industrial scale and offers the possibility to enhance coating performance. Lactide can be used in a wide range of applications, such as resins for coatings and elastomers.
The resins presented in this article demonstrate the use of lactide in saturated polyester and alkyd resins for coating applications. The research goal was to incorporate certain levels of lactide to improve the carbon footprint of the final coating, while maintaining the final properties, compared to the reference formulation, as well as keeping the resin formulation cost-neutral.
Saturated polyester resins are of increasing importance in coatings, as demands for greater hardness, flexibility, impact strength and chemical resistance intensify. These saturated polyesters have major importance in paints and lacquers. In total, three saturated polyester resins for three different types of industrial applications, namely enamel, coil and performance enamel coatings, were chosen to demonstrate the use of lactide.
The overall formulation was adjusted to maintain the properties of the reference formulation. The carbon footprint of the final resin was based on the Purac Lactide Life Cycle Analysis,1 and depended upon the data from the ecoinvent Centre and our raw material suppliers. Alkyd resins still offer a very attractive solution for meeting the environmental challenges that the paint industry is facing.
The continuing demand to lower VOCs and reduce carbon has forced producers to reformulate their resins to alkyd emulsions or high-solid systems. Alkyd resins are still favored for their gloss, flow and leveling properties. Again, the overall formula was adjusted to maintain the properties of the reference formulation. The polyester resin for enamel coatings was synthesized using xylene as an azeotropic solvent. All raw materials Table 3 were charged to the reactor equipped with a thermometer, inert gas purge, agitator and condenser.
The polyester resin for performance enamel coatings was synthesized in a two-step process, using xylene as an azeotropic solvent. The reaction temperature was maintained until a clear solution was obtained.
The theoretical resin data for all formulations is presented in Table 4. The short oil industrial alkyd resin was synthesized using xylene as an azeotropic solvent. The theoretical resin data for all formulations can be obtained in Table 6.
All industrial polyester resins were formulated as clearcoats. The solids content of the polyester resins, as well as the ratio between resin and hardener, differed depending on the application of the coating Table 7. The alkyd resins were formulated as clearcoats Table 8. All clearcoat formulations were evaluated for their mechanical properties and chemical resistance on different substrates.
The lactide-modified enamel polyester resin coating was also evaluated to assess its outdoor stability ISO A. The reference and lactide-modified polyester and alkyd resins were prepared according to the above-described methods.
The final properties of the enamel, coil and performance-enamel resins, as well as the short oil alkyd resin, were similar to the theoretical data presented.
This reduction in water, caused by the ring-opening polymerization of lactide, will be beneficial in solventborne coatings, since less water needs to be removed from the final resin. The lactide-modified polyester resins all showed a decrease in viscosity compared to the reference resins Figures 3 and 4.
The reduction in viscosity of the lactide-modified resins also enables higher-solid formulations, leading to lower VOC content in the final coating Figure 5 , since the working viscosity of the coating can be maintained. Lactide not only lowers the viscosity of the final resin, but modification with lactide also retains the rheological behavior of the polymer resin Figure 6.
Impact resistance of lactide-modified polyester coatings, as well as adhesion on metal substrates for coil- and performance-enamel coatings, were maintained compared to the reference coatings. Adhesion on metal substrates for the enamel polyester coating was significantly improved, versus reference Figure 9. Adhesion was improved because of the more polar structure of the polymer created by the incorporation of lactide.
The chemical and stain resistance for all lactide-modified polyester coatings showed comparable results. Furthermore, modification of the enamel coating with lactide exhibited a comparable outdoor behavior compared to the reference coating Figure The outdoor stability of the enamel coating during h is comparable to exposure to the Northern European climate for 1 year.
The lactide-modified enamel industrial alkyd coatings short oil showed an improvement in flexibility compared to the reference coating Figure This improved flexibility is caused by introducing a smaller, more flexible monomer.
The hardness of both the lactide-modified enamel and 2K PU alkyd coatings was comparable to the reference. The adhesion on aluminium substrates for the enamel alkyd coating was significantly improved versus the reference Figure 12 , while the 2K PU alkyd coating showed similar results to the reference.
The reference and lactide-modified industrial coatings exhibited comparable chemical and stain resistance, as well as similar discoloration, under forced conditions. Both after curing and storage under forced conditions, the lactide-modified enamel alkyd coatings showed similar gloss and yellowness index compared to the reference alkyd coatings. The lactide-modified coating shows an improvement of the discoloration and improvement in gloss after storage under forced conditions.
The reference 2K PU alkyd coatings show similar initial gloss, but deterioration of the gloss after storage under forced conditions. Lactide provides resin producers with a versatile, commercially available, bio-based building block for saturated polyester and alkyd resins for both industrial and architectural coating applications. It is possible to reformulate reference resin formulations with lactide by replacing oil-based monomers, such as di-functional glycols and di-acids.
The renewable content of the total formulation can also be improved. Furthermore, lactide-modified resins exhibit lower resin viscosity, but retain the rheological behavior of the polymer resin. This introduces the possibility of producing high-solid formulations.
With current demands for lower organic solvent emissions, the incorporation of lactide into the resin system will enable resin producers to meet these new targets. Lactide-modified polyester resins enhance the hardness of industrial coatings, while maintaining flexibility. In the case of the enamel polyester coating, flexibility, as well as adhesion on metal substrates, are improved by incorporating lactide.
Finally, modification with lactide exhibits comparable outdoor behavior compared to the reference coating, indicating that outdoor stability is not affected by incorporating lactide. The enamel alkyd coatings containing lactide-modified short oil resins show an improvement in flexibility due to introduction of a smaller, more flexible monomer, while maintaining hardness. The adhesion of this alkyd coating was especially improved on alumina.
The lactide-modified 2K PU coatings show an improvement in the discoloration and gloss retention under forced conditions. To conclude, lactide is a versatile, bio-based building block that can be easily incorporated into saturated polyester and alkyd resins for industrial coating applications; lactide improves sustainability of the coating, as well as enhances performance of both resin and coating.
For more information, e-mail: bas. Presented at the European Coatings Conference. This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block.
Theoretical short oil alkyd resin formulation data. Bas van Leeuwen and Paul Cordfunke. Lactide-Modified Resins Lactide can be used in a wide range of applications, such as resins for coatings and elastomers.
Experimental Polyester Resin Synthesis Polyester Formulation for Enamel Coatings The polyester resin for enamel coatings was synthesized using xylene as an azeotropic solvent. Polyester Formulation for Coil Coatings All raw materials Table 3 were charged to the reactor equipped with a thermometer, inert gas purge, agitator and condenser. Polyester Formulation for Performance Enamels The polyester resin for performance enamel coatings was synthesized in a two-step process, using xylene as an azeotropic solvent.
Alkyd Resin Synthesis Short Oil Alkyd Formulation The short oil industrial alkyd resin was synthesized using xylene as an azeotropic solvent. Coating Formulations Polyester Coating Formulation All industrial polyester resins were formulated as clearcoats. Alkyd Coating Formulation The alkyd resins were formulated as clearcoats Table 8. Results and Discussion Resin Synthesis Results The reference and lactide-modified polyester and alkyd resins were prepared according to the above-described methods.
Alkyd Coating Formulation The lactide-modified enamel industrial alkyd coatings short oil showed an improvement in flexibility compared to the reference coating Figure Conclusion Lactide provides resin producers with a versatile, commercially available, bio-based building block for saturated polyester and alkyd resins for both industrial and architectural coating applications.
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One of the major drivers for innovation in the chemical industry today is sustainability. This not only relates to marketing claims, but will be a general trend in the industry for many years. This momentum toward sustainability can be used in such a way that a change in formulation also improves efficiency and product performance. A sustainable business can be depended upon by its customers to supply products now and in the future. The megatrend toward making industry more sustainable has been translated by the coatings industry and legislative bodies into a number of measurable targets, such as CO2 carbon footprint and VOCs.
Exterior Architectural Coatings Market
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Patent US discloses a production of a polyester resin an ester exchange reaction of a vacuum condensation method, which is a dihydric alcohol and a dicarboxylic acid compound transesterifying a vacuum polycondensation reaction in the presence of chain branching agent, synthetic polyesters also unsaturated hydroxy for the production of polyurethane powder coatings. Patent US discloses a saturated polyester resin A method for the synthesis of hydroxy polyurethane powder coatings, which is a drawback during the synthesis of polyurethane powder coatings stored at room temperature easily form lumps transport, poor storage stability, it should not be used a polyurethane powder coating raw materials. The process for producing saturated hydroxy polyester resin used to synthesize powdered paint of polyurethane for domestic electric appliances, building material, car, agricultural machinery, etc. The synthesized powder paint has good weatherability, better decorative performance and stable nature. CNC en. Epoxy modified polyester resin for paint of coil back surface and its preparation method. CNB en.SEE VIDEO BY TOPIC: Polyester
Our pre-painted polyester steel is available in a variety of colors and supported by an industry competitive warranty. Polyester paint systems offer a hard, scratch resistant finish and a wide range of gloss options, but are prone to chalking when exposed to UV light. Polyester paint systems typically come with a standard 5 to year limited warranty depending on the paint system and manufacturer. Flexibility — offers good formability for various end-use applications. Excellent Adhesion — ensures the paint will adhere to the substrate through forming. Polyester pre-painted steel is best suited for low-end applications such as rainwater goods, shade and shelter type buildings within the agricultural market, and other applications where durability and long-lasting performance are required. Pre-Painted Steel Brochure.
What is the Difference Between Epoxy and Polyester Resin?
Moreover, to meet diversified requirements of the clients, we offer this range in different sizes and designs that can be further customized as per the requirements of the clients. We also provide the installation and maintenance services to our clients. Moreover, to meet diversified requirements of the clients, we offer this range in different sizes and. Account Options Sign in.
Paint is used to decorate, protect and prolong the life of natural and synthetic materials, and acts as a barrier against environmental conditions. Paints may be broadly classified into Decorative paints, applied on site to decorate and protect buildings and other objects, and Industrial coatings which are applied in factories to finish manufactured goods such as cars. The binder resin and solvent together are sometimes known as the vehicle. The binder may be dissolved as a solution or carried as a dispersion of microscopically small particles in a liquid. Paints are formulated according to their proposed use - primer, undercoat, special finishes matt, gloss, heat resistance, anti-corrosion, abrasion resistance. The pigment powder is broken down into individual particles which are coated by and dispersed in the binder resin - known as 'wetting out'. Solvent is then added to give the required consistency. Each batch of ingredients is thoroughly mixed in large, stirred containers with the required additives Figure 1. Amounts ranging up to 40 dm 3 of paint may be made in a single batch.
Generic types of paint
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The composition of these three components have a direct correlation to paint performance. Center and right color samples reflect levels of fade over time from lesser quality coatings. When comparing roofing paint systems, there are three common types of paint in the metal roofing industry:. Polyester paints used to be the paint of choice in the s. Polyester paint is hard and resistant to scratches, but with no silicone in the paint it is prone to chalking. The lack of silicone also means that the new, glossy appearance of the paint fades quickly. With the lowest price point today, polyester paints are also the lowest performing paints.
By rethinking the way chemical building blocks could be applied in future coatings, we will explore new chemistry for the purpose of product enhancement. We will make polymer films more durable and easier curable, adding functionalities as fouling prevention and for the purpose of enhancing the sustainability profile of paints and lacquers.
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