in this artical, we mainly talk about the application of HPMC in the coating and how does it work.
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Hydroxypropyl methyl cellulose (HPMC) belongs to the group of cellulose ethers in which hydroxyl groups have been substituted with one or more of the three hydroxyl groups present in the cellulose ring. HPMC is hydrophilic (water-soluble), a biodegradable, and biocompatible polymer having a wide range of applications in constructions, dyes and paints, adhesives, coatings, agriculture, and textiles. HPMC is also soluble in polar organic solvents, making it possible to use both aqueous and nonaqueous solvents. It has unique solubility properties with solubility in both hot and cold organic solvents. HPMC possesses increased organo-solubility and thermo-plasticity compared to other methylcellulose counterparts. It forms a gel upon heating with a gelation temperature of 75&#;&#;90&#;.(From: sciencedirect)
As the performance of hydroxypropyl methyl cellulose (HPMC) is similar to other water-soluble ethers, it can be used as a film-forming agent, thickener, emulsifier, and stabilizer for latex coatings and water-soluble resin coatings so that the coating film has good abrasion resistance, leveling, and adhesion, thereby improving its surface tension, stability to acids and alkali and compatibility with metallic pigments. Because HPMC has a higher gel point than MC, it has stronger resistance to bacterial erosion than other cellulose ethers. HPMC in the coating can be used as a thickener for water emulsion paints. HPMC also has good viscosity storage stability and dispersibility, so it is particularly suitable as a dispersant in emulsified coatings.
Examples of HPMC in the coatings industry are as follows:
The coatings prepared by hydroxypropyl methyl cellulose (HPMC) with various viscosities have good abrasion resistance, high-temperature resistance, anti-bacterial degradation, washing resistance, and acid-base stability; HPMC in the coating can also be used as a thickener for paint removers containing methanol, ethanol, propanol, isopropanol, ethylene glycol, acetone, methyl ethyl ketone or diketone alcohol; The emulsified paint prepared by HPMC has excellent wet abrasiveness; HPMC in the coating is better than HEC, MHEC, and CMC as coating thickeners.
HPMC in the coating with a high degree of substitution (DS is 1.76~2.15) has better anti-bacterial corrosion resistance than the low degree of substitution. It has stable viscosity when used in polyvinyl acetate thickener. Other cellulose ethers reduce the viscosity of the coating due to chain degradation during storage.
Paint remover can be formulated with water-soluble HPMC (28%~132% of methoxyl and 7%~12% of hydroxypropyl), dichloromethane toluene, paraffin, ethanol, methanol, and applied to a vertical surface with the required viscosity and volatility.
This paint remover can remove most conventional spray paints, varnishes, enamels, and certain epoxy esters, epoxy amides, catalyzed epoxy amides, acrylic esters, etc. Many paints can peel off within a few seconds, and some paints take 10-15 minutes or more. This paint remover is particularly suitable for wood surfaces.
The water emulsion paint can be composed of 100 component inorganic or organic pigments, 0.5-20 component of water-soluble alkyl cellulose or hydroxyalkyl cellulose, and 0.0-5 component of polyoxyethylene ether or ether ester. For example, 1.5 component of HPMC, 0.05 component of polyethylene glycol alkyl phenyl ether, 99.7 component of titanium dioxide, and 0.3 component of carbon black are mixed to obtain the colorant. Then stir the mixture with 10 of 50% solids polyvinyl acetate to get a coating and apply it on thick paper with a brush to form a dry film without any differences.
MelaColl&#; HPMC in the Coating Industry
Our MelaColl&#; HPMC products provide the following features for coating applications:
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Hydroxypropyl methylcellulose (HPMC) is widely used in the painting industry
due to its beneficial properties that enhance the performance and application of
paints. Here are the key reasons for using HPMC in painting:
HPMC acts as a thickening agent, which improves the viscosity and texture of paints. This results in better control over the paint's flow and consistency, making it easier to apply smoothly on surfaces. The thickening properties also help in achieving the desired film thickness and reduce the likelihood of drips and sags during application.
The addition of HPMC enhances the workability of paints. It helps in achieving a uniform and smooth application, ensuring that the paint spreads evenly on the surface. This is particularly important for achieving a professional finish, especially in decorative paints where aesthetics are crucial.
HPMC has excellent water retention properties, which is beneficial in water-based paints. By retaining water, HPMC ensures that the paint remains workable for a longer period, preventing premature drying. This is especially useful in hot or dry conditions where paint can dry too quickly, leading to issues such as poor adhesion and uneven texture.
Contact us to discuss your requirements of Hydroxypropyl Methylcellulose For Paints. Our experienced sales team can help you identify the options that best suit your needs.
Painting
HPMC contributes to better adhesion of the paint to various substrates. This ensures that the paint adheres firmly to the surface, reducing the risk of peeling or flaking over time. Enhanced adhesion is critical for the longevity and durability of the paint job.
HPMC helps in stabilizing the formulation of paints. It prevents the separation of pigments and other components, ensuring a consistent mixture. This stability is crucial for maintaining the quality of the paint during storage and application. Additionally, HPMC is compatible with a wide range of paint formulations, including latex, acrylic, and other water-based systems.
Rheology refers to the flow characteristics of the paint. HPMC modifies the rheology, making the paint easier to apply with various tools such as brushes, rollers, or sprayers. It ensures that the paint maintains the desired consistency and flow properties, enhancing the overall application process.
HPMC
HPMC contributes to the formation of a uniform and continuous film on the painted surface. This film is crucial for protecting the underlying substrate and providing the desired finish. The film-forming properties of HPMC also enhance the mechanical strength and resistance of the paint, improving its performance in different environmental conditions.
HPMC helps in preventing sagging, which is the downward movement of paint on vertical surfaces. By increasing the viscosity and providing thixotropic properties (the ability to become less viscous under shear stress), HPMC ensures that the paint stays in place and does not run or sag, leading to a more professional finish.
Paints formulated with HPMC exhibit enhanced durability and resistance to various environmental factors such as humidity, temperature fluctuations, and UV radiation. This results in longer-lasting paint films that maintain their appearance and protective qualities over time.
The inclusion of HPMC in paint formulations offers numerous benefits, including improved viscosity, workability, water retention, adhesion, stability, rheology modification, film formation, anti-sagging properties, and durability. These advantages make HPMC a valuable additive in the painting industry, contributing to the production of high-quality paints that deliver superior performance and aesthetic results.
MATECEL can provide high-quality HPMC and is committed to shaping the future of building materials through HPMC innovation. Just shoot us an at and we&#;ll be happy to help.
If you are looking for more details, kindly visit Hydroxyethyl cellulose (HEC).