HPMC (hydroxypropyl methylcellulose) is a modified cellulose ether widely used in the construction industry. Its addition to dry-mixed mortar can significantly improve the performance of the mortar.

1. Improve workability
HPMC can improve the fluidity and workability of mortar. Due to its unique chemical structure, HPMC is able to form a viscous colloidal solution when dissolved in water, which helps improve the lubricity of the mortar. After adding HPMC, the mortar is easier to operate during mixing and construction, especially when constructing over a large area. This advantage is particularly obvious. In addition, the lubrication effect of HPMC can also reduce friction during construction and improve the smoothness of the application.

2. Enhance water retention
HPMC has good water retention properties and can effectively prevent the mortar from evaporating too quickly during construction. Especially in hot or windy environments, the water retention of mortar is particularly important. Improved water retention properties can extend the opening time of the mortar, allowing construction workers more time to make adjustments and trimming, thereby improving construction quality.

3. Improve tensile strength
Research shows that the addition of HPMC can significantly improve the tensile strength of mortar. This is because HPMC forms a network structure in the mortar, which enhances the bonding force between particles and allows the mortar to have better mechanical properties after curing. For building structures that need to withstand large external forces, the use of dry-mixed mortar added with HPMC can provide more reliable support.

4. Improve crack resistance
The addition of HPMC can also effectively improve the crack resistance of mortar. Because HPMC can increase the toughness of mortar, it is less likely to crack during drying and shrinkage. This is particularly important in the case of large-area construction and thin-layer application, which can effectively extend the service life of the building and reduce later maintenance costs.

5. Improve water resistance
The water retention of HPMC is not only beneficial during the construction process, but also improves the water resistance of the mortar. In some humid environments or underwater construction, the use of dry-mixed mortar added with HPMC can effectively reduce water erosion of the mortar and improve its durability and stability. This has important implications for improving the overall durability of the building.

6. Improve adhesion
HPMC can improve the bonding force between the mortar and the base material and enhance the adhesion of the mortar. In the construction of walls, floors, etc., good bonding force can effectively prevent peeling and falling off, ensuring the reliability of construction quality. This is critical to increasing the safety and longevity of the building.

7. Wide range of applications
HPMC is suitable for many types of dry mixed mortar, including tile adhesive, wall mortar, plastering mortar, etc. Whether it is residential construction, commercial construction or infrastructure construction, the application of HPMC can improve the overall performance of mortar and make it more adaptable to different construction needs.

The addition of HPMC to building dry-mixed mortar can significantly improve the workability, water retention, tensile strength, crack resistance, water resistance and bonding strength of the mortar. By optimizing the mortar formula and rationally adding HPMC, we can meet the high requirements of modern buildings for material performance, improve construction efficiency, and ensure the safety and durability of the building. Therefore, HPMC is undoubtedly a valuable additive in the development and application of building materials.