How does HPMC work in dry mix mortar?

Hydroxypropyl methylcellulose (HPMC) is an important cellulose ether widely used in building materials, especially in dry-mix mortar. HPMC not only improves the construction performance of mortar, but also improves the physical and chemical properties of the finished product.

henggu jianxin supply professional and honest service.

Basic characteristics of HPMC

HPMC is a non-ionic water-soluble polymer chemically modified from natural cellulose. Its main properties include good water solubility, film-forming properties, adhesion, thickening and stability. These properties make HPMC excellent in a variety of applications, especially in mortar formulations in the construction industry.

The role of HPMC in dry mixed mortar

Enhanced water retention

HPMC has good water retention properties and can significantly improve the water retention rate of mortar. It swells in water and forms a gel-like solution, which can reduce water evaporation and loss, thereby keeping the mortar wet. This water retention effect is crucial for the full progress of the cement hydration reaction, helping to improve the bonding strength of the mortar and reduce the risk of cracking.

thickening effect

When HPMC is dissolved in water, it will form a viscous colloidal liquid, increasing the viscosity of the mortar. The thickening effect can improve the sag resistance of the mortar, making it easier to apply and shape the mortar during construction. This helps builders apply mortar on vertical surfaces such as walls to prevent the mortar from flowing or falling.

Improve workability

Because HPMC improves the lubricity and plasticity of the mortar, it makes it easier to mix, pump and spread. This improvement makes construction more convenient and increases construction efficiency. At the same time, it can also improve the thixotropy of the mortar, making the mortar thinner when subjected to shear force and thicker when stationary, which is beneficial to construction operations.

Enhance adhesion

The colloidal structure formed by HPMC in the mortar can enhance the bonding force between the mortar and the base material. This enhanced adhesion is important in applications such as tile bonding mortar or insulation mortar to prevent the material from peeling and delaminating.

Control cracking

Since HPMC can significantly improve the water retention of mortar, it helps reduce the formation of early dry shrinkage cracks. In addition, its thickening and bonding properties also disperse stress and reduce cracks caused by temperature changes or shrinkage of the substrate.

Mechanism analysis

Molecular structure and water retention

The molecular structure of HPMC contains a large number of hydrophilic groups, such as hydroxyl and methoxy groups. These groups form hydrogen bonds with water molecules, giving HPMC a strong ability to absorb and retain water. When HPMC are dissolved in water, they form a three-dimensional network structure that retains water through physical adsorption and chemical binding.

Colloid formation and thickening

In the mortar, HPMC dissolves to form a colloidal solution. This colloidal solution fills voids in the mortar and increases the overall viscosity of the mortar. HPMC molecular chains form a stable network structure through entanglement and physical association, thereby significantly increasing the viscosity of the mortar.

Lubrication and workability

HPMC molecular chains act as lubricants in mortar. They can form a lubricating film on the surface of aggregate particles, reducing the friction between particles. This lubrication effect makes the mortar easier to stir and construct, improving the smoothness of construction.

Interfacial adhesion and cohesion

The colloidal structure of HPMC will form a thin film after drying. This thin film can effectively adhere to the surface of the base material and enhance the bonding force between the mortar and the base material. This effect is very important for improving the adhesion properties of mortar.

Application examples of HPMC

Tile bonding mortar

In ceramic tile bonding mortars, the water retention and bonding properties of HPMC ensure that the mortar has sufficient wetting time and bonding strength when bonding ceramic tiles, preventing the ceramic tiles from falling off and sliding during the drying process.

Plastering mortar

In plastering mortars, the thickening effect of HPMC makes it easier to apply the mortar to the wall and prevents the mortar from falling. Its good water retention properties also reduce the risk of cracking in the plaster layer.

Self-leveling mortar

For self-leveling mortar, the thixotropy and lubricating properties of HPMC ensure that the mortar has good self-leveling properties when flowing, while maintaining appropriate viscosity when stationary, which is convenient for construction operations.

The role of HPMC in dry-mixed mortar is multifaceted. It not only improves the performance of the mortar by enhancing water retention and thickening properties, but also enhances the construction effect by improving workability and adhesion. The application of HPMC has enabled dry-mix mortar to be widely used in modern construction, greatly improving the quality and efficiency of construction. In the future, with the continuous advancement of building materials technology, the application scope and effect of HPMC will be further expanded and enhanced.

Product Description

HPMC For Cement Mortar

If you are looking for more details, kindly visit masonry mortar use hpmc.

 

1.Hydroxypropyl methylcellulose is used as a water retaining agent and retarder in cement mortars to make the mortars pumpable.

After mixing according to measurement at the mixing station, use a mixing truck to transport the mixture to the place of use and store it in a special container, and use the wet mix within the specified time. In the mortar used as a binder, in order to improve the spreadability and extend the operating time, the water retention of hydroxypropyl methylcellulose HPMC will not cause the slurry to break due to drying too fast after coating, and improves the strength. Water retention is an important property of hydroxypropyl methylcellulose HPMC and is also the performance of many wet mixed mortar manufacturers in China. Factors that affect the water retention effect of wet mixed mortar include the amount of HPMC added, the viscosity of HPMC, the fineness of the particles and the temperature of the use environment.

The important role of hydroxypropyl methylcellulose HPMC in wet-mixed mortar is mainly reflected in three aspects.

One is excellent water retention performance, the other is the interaction with cement, and the third is the influence on the consistency and thixotropy of wet-mixed mortar. Whether its water retention effect is good or not depends on the water absorption rate of the base layer, the composition of the mortar, the thickness of the mortar layer, the water demand of the mortar and the setting time of the solidifying material. The higher the transparency of hydroxypropyl methylcellulose, the better its water retention.

Generally speaking, the higher the viscosity, the better the water retention effect. However, the higher the viscosity, the higher the molecular weight of HPMC, and its solubility will decrease accordingly, which will have a negative impact on the strength and construction performance of the mortar. The higher the viscosity, the more obvious the thickening effect of the mortar, but this is not always the case. The higher the viscosity, the more viscous the wet mortar will be, and it will exhibit stickiness to the knife and adhesion to the substrate when used. The fineness of hydroxypropyl methylcellulose also affects its water retention. Generally speaking, for hydroxypropyl methylcellulose with different viscosity phase and different fineness, the finer the fineness, the smaller the fineness. Better water retention effect.

In wet mixed mortar, the addition amount of HPMC is low, but it can significantly improve the construction performance of wet mixed mortar. This is the main additive that affects the construction performance of mortar. The correct selection of hydroxypropyl methylcellulose has a great influence on the performance of wet mix mortar.

The greater the amount of HPMC added to the wet-mix mortar, the better the water retention performance, and the higher the viscosity, the better the water retention performance. Fineness is also an important performance indicator of hydroxypropyl methylcellulose.
Factors that affect the water retention of wet-mix mortar include cellulose ether viscosity, addition amount, particle fineness and service temperature.

 

 

2. Application:

 

Construction grade hydroxypropyl methyl cellulose hpmc products is powder. Store under dry and clean condition, ventilation required. Avoid the direct sunlight and damped area. Using the product as soon as possible after opening. If you can't use it up, keep it tightly closed. After being damp, the product will agglomerate.

1. 25KG/bag, OPP / PP / PE bag inside, weaving bag, paper bag or carton barrel outside.

2. Can be designed and customized by your requirements.

3. Factory Strength

4. Packing And Shipping

DELIVERY

We can deliver the goods within 4-7 days. Such a fast delivery time depends on our strong production capacity which is not affected by the environmental protection and the shutdown, so if you want to find a stable supplier of goods, choose us.

We can accept TT, LC, PAYPAL, West Union, Money Gram etc.

Terms of delivery are EXW, FOB, C&F, CFR, CNF, CIF etc.

5.CERTIFICATION

 

Get A Free Quote

 

Want more information on polyvinyl alcohol formula? Feel free to contact us.