redispersible latex powder RDP for tile adhesivesDecember 7th 2023
China’s cellulose ether production, processing and consumption in the world’s leading position.
1 the introduction
At present, The production, processing and consumption of cellulose ether in China are in a leading position in the world. The further development and utilization of cellulose ether is the key to the development of new building materials in China. With the continuous development of ceramic tile adhesive, the continuous optimization and improvement of performance, in the new building materials market has enriched the choice of mortar application type. But how to further optimize the main properties of tile binder has become a new direction of tile binder market development.
2 Experimental design, methods and materials
2.1 Experimental materials:
Cement: Conch P.O42.5 Ordinary Portland cement used for this test sand: black sand
Dispersed polymer powder: SwF-04, Shanxi three dimensional cellulose ether production: test using a viscosity of 100,000 methyl cellulose ether 2.2 experimental design and method:
The tensile bond strength test method refers to JC/T547-2005, and the test block size is 40mm×40mm×160mm. After molding for one day, after stripping molding, the drawing head and test sheet are bonded with epoxy resin after curing at a temperature of (23±2) ℃ and relative humidity of (50±5) %, and placed in a constant temperature and humidity chamber for 27 days. Then put into the temperature of (23±2) ℃ constant temperature and humidity chamber, humidity of (50±5) % maintenance 1d, check whether there are cracks before the sample. The fixture is installed on the universal tension tester to ensure that the fixture will not bend to the tester. The specimens were stretched at a speed of (250±5) N/s and the test data were recorded.
Three experimental results
Cement test volume 400g, the total mass of other materials 600g.
4 Discussion of Results
It can be seen from the table that the binding strength of cellulose ether containing 0.3% is 16% higher than that of water containing 0.1%. The increase in the amount of plastic powder is more obvious, the amount of plastic powder mixed more than 5% of the original bond strength increased 46.5%, to 3%. When the content of rubber powder increases from 3% to 5%, the relative bond strength decreases by 23.4%. When cellulose ether content increased from 0.1% to 0.3%, the relative value of bond strength decreased by 7.6%.
JC/T547-2005 stipulates that the time of ceramic tile laying is greater than or equal to 20min. Increasing the content of cellulose ether can make the tensile bond strength increase gradually after 20min. The cellulose ether content was 0.2%, and the bond strength was 0.3%, which increased by 48.1% and 59.6%, respectively. When the content of rubber powder increased, the tensile bond strength increased gradually after 20 minutes, the content of rubber powder was 4%, the content of rubber powder was 3%, and the joint strength increased by 19.0% and 41.4%, respectively. It can be clearly seen from the table that the dosage of cellulose ether reflects the effect of ventilation for 20min. With the increase of cellulose ether content, the relative value of its strength gradually decreased and tended to gentle. It can be seen that the viscosity of cellulose ether knot strength has a good improvement effect.
1) Increasing the content of cellulose ether and powder can improve the tensile bond strength of ceramic tile adhesive to a certain extent.
2) after the ceramic adhesive was exposed for 20min, the amount of cellulose ether had the greatest influence on the tensile bond strength, indicating that the tensile bond strength of ceramic adhesive could be well removed by adjusting the amount of cellulose ether.