1. What are the ingredients in the wall putty formula?
Wall putty formulations include adhesives, fillers and additives.
Exterior wall putty recipe reference
Weight (kg) Material
300 White or gray clay cement 42.5
220 silica powder (160-200 mesh)
450 heavy calcium powder (0.045mm)
6-10 Redispersible polymer powder (RDP) ET3080
4.5-5 HPMC MP45000 or HEMC ME45000
3 white wood fiber
1 polypropylene fiber (thickness 3 mm)
Wall putty includes interior wall putty and exterior wall putty. Its main function is to repair unevenness and make the wall smooth.
1.1 Adhesive
The binders in the wall putty formula are cement, high-viscosity polymer powder, and slaked lime. Cement is widely used in construction. It is famous for its good adhesion, high hardness and high cost performance. But the tensile strength and crack resistance are poor. Powder Powder is a redispersible polymer powder. It can play a bonding role in wall putty formulas.
1.2 Filling
The fillers in the wall putty formula refer to heavy calcium carbonate, Shuangfei powder, gray calcium powder, and talc powder. The fineness of grinding calcium carbonate is about 200 mesh. Do not use fillers that are too granular in your wall putty formula. This results in uneven flatness. Fineness is an important factor in wall putty formulations. Bentonite clay is sometimes added to increase catchability.
1.3 Auxiliary equipment
Additives in wall putty formulas include cellulose ethers and VAE redispersible latex powder. This type of additive plays the role of thickening and water retention. The main cellulose ethers are HPMC, MHEC, and CMC. The amount of cellulose ether used is important for a viable formulation.
Hydroxypropylmethylcellulose
In the HPMC structure, one chemical is hydroxypropionyl. The higher the hydroxypropoxy group content, the better the water retention effect. Another chemical is methoxy. The gel temperature depends on it. In hot environments, workers pay more attention to this indicator. Because if the ambient temperature exceeds the HPMC gel temperature, the cellulose will precipitate out of the water and lose its water retention. For MHEC, the gel temperature is higher than that of HPMC. Therefore, MHEC has better water retention.
HPMC does not undergo chemical reactions. It has good water retention, thickness and workability.
1. Consistency: Cellulose ether can thicken and keep the solution uniform up and down. It gives wall putty good sag resistance.
2. Water retention: Reduce the drying speed of putty powder. And it is beneficial to the chemical reaction between gray calcium and water.
3. Good workability: cellulose ether has lubricating function. This can give the wall putty good workability.
Redispersible polymer powder refers to VAE RDP. Its dosage is low. Some workers may not add it to the wall putty formula to save money. RDP can make wall putty lightweight, waterproof and flexible. The addition of redispersible polymer powder speeds up application and improves smoothness.
rdp 2 1
Sometimes, wall putty recipes contain fibers, such as polypropylene fibers or wood fibers. PP fiber concrete is an effective way to prevent cracks.
polypropylene fiber concrete
Tips: 1. Although cellulose ether is an important element in the putty powder formula. However, the dosage of cellulose ether should also be strictly controlled. This is because cellulose ethers, such as HPMC, can be emulsified. If used in excess, cellulose ethers can emulsify and entrain air. At this time, the putty will absorb a lot of water and air. After the water evaporates, the putty layer leaves a large space. This will ultimately lead to a decline in strength.
2. Only rubber powder is added to the wall putty formula, and no cellulose is added, which will cause the putty to powder.
2. Types of wall putty
HPMC wall putty used for wall putty includes interior wall putty and exterior wall putty. Exterior wall putty will be affected by wind, sand, and hot weather. Therefore, it contains more polymers and has higher strength. But its environmental index is low. However, the overall indicators of interior wall putty are better. Interior wall putty formula contains no harmful elements.
Wall putty formulas mainly include gypsum-based wall putty and cement-based wall putty. These formulas combine easily with bases. There is a wall putty recipe as follows:
2.1 White cement-based wall putty formula
White cement-based wall putty can be used on interior and exterior walls. Both gray and concrete walls can use it. This kind of putty uses white cement as the main material. Fillers and additives are then added. After drying, no unpleasant smell will be produced. Cement-based formula provides high strength and hardness.
2.2 Acrylic wall putty formula
Acrylic putty is an acrylic adhesive made from a special material. It has a peanut butter-like consistency. Can be used to fill cracks and patch holes in walls
What is the difference between cement-based wall putty and acrylic wall putty?
Acrylic putty is suitable for interior walls, but costs more than cement-based putty. Its alkali resistance and whiteness are also better than cement-based putty. Plus, it dries faster than white cement, so the job needs to be done quickly.
2.3 Flexible wall putty formula
Flexible putty consists of high-quality cement, fillers, synthetic polymers and additives. And sun exposure will not affect the construction of putty. Flexible putty has high bonding strength, flat and smooth surface, and is water-proof and moisture-proof.
In summary
When choosing the right putty formula, it’s often impossible to talk about the starting formula. The formula should be combined with the environment, such as regional characteristics, raw material quality… The most perfect putty formula is to apply putty according to local conditions. Change the putty formula to achieve the scraping effect.
Post time: Sep-13-2023