CELLULOSE ETHER FOR CEMENT WALL PLASTER, GYPSUM PLASTER and LIME PLASTER
Cement, gypsum or Lime based plaster is one of the main applications of cellulose ether(HPMC-hydroxypropyl methylcellulose / MHEC - methyl hydroxyethyl cellulose)
1.What is plaster？
Plater also named as render is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. Another imprecise term used for the material is stucco, which is also often used for plasterwork that is worked in some way to produce relief decoration, rather than flat surfaces.
Cellulose ether is one of the most important additives used in cement, lime and gypsum plaster. Normally HPMC-hydroxypropyl methylcellulose and MHEC-methyl hydroxyethyl cellulose are selected to use in the formulation as the thickener agent and water retaining agent.
2.Classify of plasters:
Gypsum, Lime or Cement plaster
3.Guideline for plastering
(1) Preparation of the working surface:
· Clean and free of dust.
· Working temperature is no risk of freezing
· Reasonably dry
· If the projection on the wall surface is more than 12mm, then knock it off, so as to obtain a uniform surface of wall.
(2) Mixing the plaster
· All the tools should be cleaned before use to prevent contamination.
· Add water into mixing bucket, don’t add any other additives in the packaged plaster.
· Make sure check the expiry date of the plaster before mixing
4. The functions of cellulose ether(HPMC-hydroxypropyl methylcellulose / MHEC- methyl hydroxyethyl cellulose) in wall plaster formulation:
(1) The workability
Choose the right specifications of cellulose ether(HPMC/MHEC), the workability of plaster could be improved significantly. HPMC / MHEC could provide a good consistency. Make the plaster easy to scrape on the wall, increase the efficiency.
(2) Water retention
MHEC or HPMC could provide a good water retention, make sure the cement and other additives fully hydrated which can increase the working time and reduce the risk of cracking. Meanwhile, increase the bonding strength between wall surface and plaster.
(3) Adjust the setting time
Hydroxypropyl Methylcelluloses can be used as set-retarders for cement-based, gypsum based or lime based building materials. If there is no need for particularly long construction time, such a retarding effect is sufficient to satisfy the use needs. Hydroxypropyl Methylcellulose also have certain set-retarding effects on gypsum-based products.
(4) Air entraining
Adding cellulose ether HPMC or MHEC in plaster could make it have a reasonable air entraining. The tiny bubbles can be produced inside the wet mortar, like a honeycomb structure. Act like lubricants could have a very good construction performance. It also make contributions on heat resistance and sound insulation. Meanwhile helpful to reduces the bulk density of product.
5. The specifications of cellulose ether used in Plaster:
| Mailose MP/ME75K | Mailose MP/ME100K | Mailose MP/ME150K | Mailose MP/ME200K | Mailose MP/ME60K | Mailose MP/ME40K |
Appearance | White powder
| White powder | White powder | White powder | White powder | White powder |
Moisture | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% |
Ash content | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% |
PH | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 |
Viscosity NDJ-1，2% solu. | 60000-90000cps | 80000-120000cps | 120000-180000cps | ≥180000cps | 48000-72000cps | 32000-48000cps |
Particle size | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh |
Ash content | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% |
PH | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 | 4.0-8.0 |
Viscosity NDJ-1，2% solu. | 60000-90000cps | 80000-120000cps | 120000-180000cps | ≥180000cps | 48000-72000cps | 32000-48000cps |
Particle size | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh | 95 pass 100 mesh |
Expiry | 2 years | 2 years | 2 years | 2 years | 2 years | 2 years |
JINAN MAISSEN NEW MATERIAL CO.,LTD is the major cellulose ether and redispresible polymer powder producer in China.
Main products includes:
HPMC-hydroxypropyl methyl cellulose
MHEC-methyl hydroxyethyl cellulose
RDP-redispersible polymer powder
Other additives in dry mix mortar industry.
For more information, please contact with us : info@mailose.com
Key words: cellulose ether, HPMC, MHEC, hydroxypropyl methylcellulose, methyl hydroxyethyl cellulose, wall plaster
