The effect of the amount of latex powder added on the hardness of the putty. Adding an appropriate amount of latex powder to the putty or insulation mortar can not only greatly increase the bonding strength, but also greatly help the improvement of the hardness. Let’s take 1 ton of putty as an example To explain the relationship between the amount of addition and the hardness of the putty, when the amount of latex powder is increased from 0 to 1 kg, the bond strength of the putty only increases by 0.118 M Pa, and the increase in the bond strength of the putty is small.
But when the amount of latex powder increased to 2 kg, the bond strength of putty increased significantly to 1.142 MP a, which continued to increase with the increase of latex powder addition, which was larger than the 0~1.0% segment, but Its growth rate is smaller than the 1.0% ~ 2.0% segment.
However, when the amount of latex powder reaches a certain amount, the emulsion can continuously form a film within a certain range, forming a cross network structure in the putty layer, and with the inorganic hydrate network structure of lime calcium powder, or cement, fly ash, etc. Compounding each other greatly increases the bonding strength of the putty. When the amount of latex powder exceeds 2.5 kg, the bonding strength of the putty decreases.
When the content of latex powder is higher than 2.5 kg, the large-area continuous film formed will weaken the continuity of the inorganic hydrate network structure, resulting in a decrease in the bonding strength of the putty.
The redispersible latex powder manufacturer and the laboratory of the hydroxypropyl methylcellulose manufacturer have conducted experimental research on this;
The weights of latex powder added to the putty were 0 kg, 1.5 kg, and 3 kg. After the putty was cured for 7 days, the putty with different addition amounts of latex powder showed different forms. The putty with the addition amount of latex powder was 0 kg, and the putty was inorganic The gaps between the skeletons are large and numerous; when the latex powder content is less than 1.5 kg, the cured latex powder fills the gaps between part of the inorganic skeletons;
When the amount of latex powder added in the putty exceeds 1.5 kg, the solidified latex powder not only fills the gaps between part of the inorganic skeleton, but also forms a film in a small area, which strengthens the inorganic skeleton, thereby greatly increasing The viscosity strength of the putty.
When the amount of latex powder added to the putty is increased to 3 kg, it can be seen that the latex powder forms a film in a large range. Almost all the sections of the putty are polymer films, which weakens the continuity of the inorganic skeleton and therefore reduces the putty. The bond strength.
According to the experimental and practical research data of the redispersible latex powder manufacturers, the best content of latex powder in putty should be 1.5-2.5 kg, and the addition amount of hydroxypropyl methylcellulose is 3-5 kg.