HPMC is mainly used as a dispersant in the production of polyvinyl chloride, and is the main auxiliary agent for the preparation of PVC by suspension polymerization. In the construction process of the building industry, it is mainly used in mechanized construction such as wall masonry, plastering, caulking, etc.; especially in decorative construction, it is used for pasting tiles, marbles, and plastic decorations, with high bonding strength, and can reduce the amount of cement . Used as a thickening agent in the coating industry, it can make the layer bright and delicate, without powdering, and improve the leveling performance.
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In cement mortar and gypsum-based slurry, HPMC mainly plays a role of water retention and thickening, which can effectively improve the adhesion and sag resistance of the slurry. Factors such as air temperature, temperature and wind pressure speed will affect the volatilization rate of water in cement mortar and gypsum-based products.
Therefore, in different seasons, there are some differences in the water retention effect of the same amount of HPMC.
In the specific construction, the water retention effect of the slurry can be adjusted by increasing or decreasing the amount of HPMC added. The water retention of methyl cellulose ether under high temperature conditions is an important indicator to distinguish the quality of hydroxypropyl methyl cellulose ether. Excellent hydroxypropyl methyl cellulose series products can effectively solve the problem of water retention at high temperatures. In high-temperature seasons, especially in hot and dry areas and thin-layer construction on the sunny side, high-quality HPMC is required to improve the water retention of the slurry.
Michem's HPMC has very good uniformity. Its methoxy and hydroxypropoxy groups are evenly distributed along the cellulose molecular chain, which can increase the oxygen on the hydroxyl and ether bonds. The ability of atoms to associate with water to form hydrogen bonds turns free water into bound water, thereby effectively controlling the evaporation of water caused by high temperature weather and achieving high water retention. In order to set cementitious materials such as cement and gypsum, water is required for hydration. The correct amount of HPMC can maintain the moisture in the mortar for a long enough time so that the setting and hardening process can continue.
The amount of hydroxypropyl methylcellulose (HPMC) required to obtain sufficient water retention capacity depends on:
1. The absorbency of the base layer
2. Composition of mortar
3. Layer thickness of mortar
4. Water demand of mortar
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5. Setting time of cementitious material
Hydroxypropyl methyl cellulose can be uniformly and effectively dispersed in cement mortar and gypsum-based products, and wrap all solid particles, and form a layer of wetting film. The water in the base is gradually released over a long period of time. The cementitious material undergoes hydration reaction to ensure the bonding strength and compressive strength of the material.
Therefore, in the high temperature summer construction, in order to achieve the effect of water retention, it is necessary to add high-quality HPMC products in sufficient quantities according to the formula, otherwise, insufficient hydration, reduced strength, cracking, hollowing and falling off will occur due to excessive drying. Problems, but also increase the difficulty of construction workers. As the temperature drops, the amount of HPMC added can be gradually reduced, and the same water retention effect can be achieved.
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Grade
Description
Typical Viscosity
(2% in water at 20°C, mPa·s)
Applications
METHOCEL&#; 254METHOCEL&#;&#; cellulose ethers are the perfect choice for improving the quality and performance of your building materials.
When it comes to building materials, quality matters. However, it is not always easy to achieve the desired performance level, especially on a consistent basis. This is where METHOCEL&#; cellulose ethers come in handy. METHOCEL&#; consists of hydroxypropyl methylcellulose (HPMC) cellulose ethers that can help you create industry-leading building materials with superior performance and greater durability. From cement mortars to concrete, METHOCEL&#; cellulose ethers can help you make building materials that will withstand the test of time.Cellulose ethers are a family of chemicals with properties similar to cellulose, the most abundant organic compound on Earth. METHOCEL&#; HPMC is derived from wood pulp, biodegradable, and safe for the environment.METHOCEL&#; plays a critical role in producing cement-based building materials. As additives, these cellulose ethers provide superior performance, durability, and ease of use. They are ideal for use in building materials primarily because they provide the following benefits:&#; Exceptional application performance in cement mortar and concrete mixes&#; Enhanced durability and strengthMETHOCEL&#; increases workability and enhances mixing characteristics by providing lubrication for dispersed particles in a mixture, leading to smooth, homogeneous finishes. It also increases consistency and improves rheology in mixes, further creating better workability through higher ease of spreading. METHOCEL&#; also increases adhesion to walls and surfaces, preventing sagging in cement-based products like plasters.METHOCEL&#; has extremely high water retention properties, which help slow evaporation and provide more hydration to the cement over a longer period, allowing better mechanical strength to develop. This also contributes to better homogeneity and reduces the risk of cracking. Products like plasters are often applied to porous and absorbent surfaces, leading to water loss in plasters and poor strength. The water retention properties of METHOCEL&#; help mitigate this, retaining more water for the proper strength to develop. In addition, METHOCEL&#; cellulose ethers improve the compressive strength of concrete by binding the particles of concrete mix together. These compounds formed from binding also make concrete less susceptible to pressure-related cracking. Additionally, cohesive strength may be improved through the interlocking that occurs with cement paste.METHOCEL&#; HPMC is the perfect choice for improving the quality and performance of your building materials. Adding METHOCEL&#; to your cement mortar or concrete can make your building materials stronger, more durable, and resistant to cracking and other damage. These cellulose ethers are also valuable in gypsum-based products for many of the same reasons.
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