What is the difference between using hydroxypropyl methylcellulose in exterior wall putty and interior wall putty

What is the difference between using hydroxypropyl methylcellulose in exterior wall putty and interior wall putty

Exterior wall putty and interior wall putty have different performance requirements and application environments, so when using hydroxypropyl methylcellulose (HPMC), its role and effect are also different.

Advantages of using HPMC in exterior wall putty

Enhanced weather resistance
Anti-ultraviolet: Exterior wall putty needs to be exposed to the sun for a long time. HPMC can improve the anti-ultraviolet ability of putty and prevent putty from aging and fading.
Anti-rainwater erosion: HPMC improves the waterproof performance of putty, reduces the damage caused by rainwater erosion, and extends the service life of exterior wall putty.

Improved bonding strength
Exterior wall putty needs to have a high bonding strength to resist wind and rain and temperature changes. HPMC enhances the bonding force of putty to ensure that the putty layer is firmly attached to the wall.

Improved construction performance
Anti-sagging: A thicker putty layer is usually required for exterior wall construction. The anti-sagging performance provided by HPMC prevents putty from sagging or sagging during construction.
Water retention: Exterior wall putty is exposed to a dry external environment, and the water retention property of HPMC helps putty stay moist and prevent premature drying and cracking.

Advantages of using HPMC in interior wall putty

Improve smoothness and fineness
Interior wall putty is usually used for interior decoration, and has high requirements for surface smoothness. HPMC provides excellent lubricity, making putty easier to scrape and the surface smoother and finer.

Improve construction performance
Extend operation time: The indoor construction environment is relatively stable, but requires high construction precision. The water retention property of HPMC extends the open time of putty and makes construction more relaxed.
Anti-sagging: The indoor wall flatness requirements are high, and the anti-sagging property provided by HPMC ensures that the putty does not sag during construction.

Improve the flexibility of putty
Interior wall putty requires a certain degree of flexibility to adapt to the slight deformation of the wall and prevent cracking. HPMC enhances the flexibility of putty and reduces cracking caused by thermal expansion and contraction.

Similarities

Whether it is exterior wall putty or interior wall putty, the use of HPMC has the following common advantages:
Thickening effect: HPMC increases the viscosity of putty, making it easier to construct and shape.
Anti-sedimentation: HPMC helps to evenly distribute solid particles in putty, prevent sedimentation, and maintain the uniformity and consistency of putty.
Environmental safety: HPMC is a non-toxic and harmless additive that is harmless to the environment and human body and meets modern environmental protection requirements.