La caratteristica più importante dell'HPMC è la capacità di trattenere l'acqua nei materiali da costruzione. Il mantenimento di un'umidità sufficiente nelle malte a secco per un periodo prolungato garantisce la lavorabilità, mentre l'acqua svolge anche un ruolo di lubrificazione e miscelazione all'interno della composizione inorganica. Ciò consente di pettinare facilmente le malte a strato sottile e di livellare ripetutamente le malte da intonaco.
Per valutare la qualità dell'HPMC, valutarne l'aspetto, la solubilità, la viscosità, la ritenzione idrica, la purezza, la stabilità termica, il contenuto di umidità, la temperatura del gel e le prestazioni in applicazioni specifiche attraverso vari test fisici e chimici.
HEMC enhances water retention in cement-based products, preventing premature drying and ensuring better hydration of cement, which leads to improved strength and durability of the final product.
Typical grades range from 15,000 mPa·s to 75,000 mPa·s (2% solution, 20°C). Selection depends on application:
Yes, HEC solutions are compatible with most water-soluble polymers and can coexist with other cellulose ethers, starch and its derivatives, gelatin, and natural gums. HEC can also coexist with surfactants and salts, making it an excellent colloidal thickener for solutions containing high concentrations of electrolytes.
Surface-treated HEC disperses in cold water without coagulating, but its dissolution rate is relatively slow, typically requiring about 30 minutes. Heating it or adjusting the pH to 8-10 can facilitate rapid dissolution.
Store in sealed containers at <25°C with <60% humidity. Avoid direct sunlight to prevent moisture absorption and clumping.
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Landercoll® is a trademark for LANDU’s cellulose ether, providing certified HPMC, HEMC, and HEC products for construction, coatings, detergent, and pharmaceutical industries. Our three-tier solutions include cost-effective standard grades, high-performance modified cellulose ethers, and custom-formulated additives to meet specific application requirements.
Our state-of-the-art facilities produce 20,000 MT of HPMC, 15,000 MT of HEMC, and 5,000 MT of HEC annually, ensuring reliable global supply chains with competitive pricing and rapid delivery capabilities.
Yes, we ensure product stability through advanced manufacturing technologies: vertical reactors achieve more complete chemical reactions compared to horizontal models, while our proprietary cyclone air-mixing system (versus conventional mechanical mixing) enables superior material homogeneity. The fully automated production process with real-time quality monitoring minimizes human intervention, maintaining consistent batch-to-batch quality across all parameters.
Environmental responsibility is Landu's core commitment. We've invested $2 million in dedicated wastewater purification and exhaust gas treatment facilities, ensuring full compliance with national environmental standards. This infrastructure supports sustainable operations while maintaining production continuity through rigorous regulatory adherence.
Our technical support is backed by an independent R&D center with fully equipped laboratories implementing rigorous quality control protocols. For every production batch, we conduct comprehensive physical and chemical analyses including hydroxypropyl/hydroxyethyl content verification, methoxy group quantification, viscosity profiling, ash content measurement, moisture determination, and pH value monitoring. This systematic approach ensures consistent product quality while enabling customized formulation adjustments to meet specific application requirements.
Landu products' application performance is validated through systematic testing at our Application & Modification Center, which features specialized construction material labs conducting dry-mix mortar simulations and real-world scenario evaluations. Through collaborative analysis with clients, we identify optimal cellulose ether specifications and dosage parameters that maximize technical performance while minimizing material costs. This process enables iterative formulation improvements based on application test feedback, delivering customized solutions that achieve both functional requirements and economic efficiency in building material systems.
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You might consider HPMC viscosity, stability, purity(Hydroxypropyl content), and the degree of substitution and modification. These factors determine the properties, including moisture control ability, thickening effect, opening time, tensile strength, and bonding strength, of your tile adhesive products. For C1 grade tile adhesive used for general conditions, we recommend high-viscosity HPMC such as LANDERCOLL K200. If tiles need to face challenging environments, you can choose an anti-sagging HPMC like LANDERCOLL K75HT, as a C2-grade tile adhesive chemical. If you can't decide which one to choose, you can contact us and our professional team will take a deep look at your requirements and local conditions. Then LANDERCOLL chemists and technicians work together to offer the best option for you.
One of the primary roles of cellulose ether, such as Hydroxypropyl Methyl Cellulose (HPMC), is to preserve moisture, which is vital during the curing process. Maintaining moisture levels improves the workability of the putty, making it easier to apply and spread evenly across surfaces. This also helps reduce the risk of imperfections like lumps or uneven surfaces. Additionally, the presence of cellulose ether enhances the bonding strength between the putty and various substrates, ensuring a long-lasting durable finish.
When selecting Hydroxypropyl Methylcellulose (HPMC) for high sulfuric acid concentrations, prioritize grades with a higher methoxyl substitution and moderate hydroxypropyl substitution, as this enhances acid resistance by reducing solubility and degradation. Opt for higher viscosity grades (e.g., 50,000–100,000 mPa·s) to form protective gels that slow acid penetration, while ensuring thermal stability (gelation temperature >60°C) to withstand potential heat from acid reactions. Coarser particle sizes may improve dissolution control in acidic environments.
HPMC improves the bonding strength between the insulation board and the mortar and maintain adequate moisture levels during the curing process. By increasing the opening time of the mortar, HPMC also provides installers with more flexibility during application. It also enhances the thixotropic behavior of the mortar, preventing sagging or slumping on vertical surfaces. HPMC also contributes to crack resistance by minimizing shrinkage and accommodating thermal expansion and contraction within the EIFS layers.
1. Pulire la superficie e ispezionare il pavimento per individuare eventuali crepe o fori e ripararli con uno stucco adatto.
2. Irruvidire e adescare il substrato per massimizzare l'adesione.
3. Iniziare a versare il composto miscelato sul pavimento preparato, lavorando dall'angolo più lontano verso l'uscita per evitare di rimanere intrappolati.
4. Passare un rullo a spatola sulla superficie per rimuovere le bolle d'aria.
5. Verificare con una livella l'uniformità della superficie e lasciare che il composto autolivellante si indurisca.
Sì, la pittura a emulsione è impermeabile. Dopo l'essiccazione può formare una pellicola protettiva che funge da barriera contro l'umidità. Aggiungendo l'HEC modificato idrofobicamente di LANDERCOLL, la formulazione della vernice in emulsione può essere più impermeabile e più liscia da applicare.
LANDERCOLL provides a referenced cement render formula as follows but only for reference. Please conduct experimental verification before use and adjust the formula based on the actual situation.
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