1 Introduction

Today, the production, processing and consumption of cellulose ethers in my country are in the leading position in the world. The further development and utilization of cellulose ether is the key to the development of new building materials in my country. With the continuous development of tile adhesives and the continuous optimization and improvement of performance, the choice of mortar application types in the new building material market has been enriched. However, how to further optimize the main properties of tile adhesives has become the development of the tile adhesive market. new direction.

2 Experimental design, methods and materials

2.1 Experimental raw materials:

Cement: Conch P.O 42.5 Ordinary Portland Cement was selected in this test

sand: black sand

Redispersible latex powder: SWF-04 is used in this test, produced by Shanxi Sunway

Cellulose ether: The methyl cellulose ether with a viscosity of 100,000 was used in this test, produced by Shandong Yiteng

2.2 Experimental design and methods:

The tensile bond strength test method refers to the standard JC/T547-2005. The size of the test block is 40mm×40mm×160mm. After forming, it is left to stand for 1d to remove the mold. After curing in a constant temperature and humidity chamber for 27 days, the drawing head and the test block were bonded with epoxy resin, and then placed in a constant temperature and humidity chamber with a temperature of (23±2) °C and a relative humidity of (50±5)%. After curing for 1d, check the sample for cracks before the test. Install the fixture to the universal electronic tensile testing machine to ensure that the connection between the fixture and the testing machine is not bent, pull the specimen at a speed of (250±5) N/s, and record the test data.

3 Experimental results

The cement dosage in this experiment is 400g, and the total mass of other materials is 600g.

4 Discussion of results

It can be found from the table that the bond strength of the cellulose ether content of 0.3% is improved by 16% compared with the water immersion bond strength of the content of 0.1%. The improvement is more obvious when the content of rubber powder is increased. The original bond strength is increased by 46.5% when the content of rubber powder is 5% compared with that of 3%. When the content of rubber powder increased from 3% to 5%, the relative value of its bond strength decreased by 23.4%; when the content of cellulose ether increased from 0.1% to 0.3%, its bond strength decreased. Decreasing the relative value increased by 7.6%.

JC/T547-2005 stipulates that the drying time of tile adhesive is greater than or equal to 20min. Increasing the content of cellulose ether can make the tensile bond strength gradually increase after airing for 20 minutes. When the content of cellulose ether is 0.2% and 0.3%, the bond strength is higher than that when the content is 0.1%. Increased by 48.1% and 59.6%; increasing the amount of rubber powder can also make the tensile bond strength gradually increase after 20min of airing. The amount of rubber powder is 4% and 5%. The knot strength is increased by 19.0% and 41.4%, respectively. It can be clearly found from the table that after 20min of airing, the effect of the content of cellulose ether is more obvious at this time. As the content of cellulose ether increases, the relative value of its strength decreases gradually and tends to be flat. It can be seen that cellulose ether has a good effect on improving the bonding strength of tile adhesives after 20 minutes of drying.

5 Conclusion

(1) Increasing the content of cellulose ether and rubber powder can improve the tensile bond strength of tile adhesive to a certain extent.

(2) The content of cellulose ether has the greatest influence on the tensile bond strength of the tile adhesive after airing for 20min, indicating that by adjusting the content of cellulose ether, the tensile strength of the tile adhesive after airing for 20min can be well improved Bond strength.