A kind of modified hydroxypropyl methylcellulose for reinforced tile adhesive and its preparation method and application

Abstract

The invention discloses a modified hydroxypropyl methylcellulose for reinforced tile adhesive, which is prepared from the following raw materials in mass percentage: 54%-94% of hydroxypropylmethylcellulose, 5%-40% of starch ether , dispersant 0.5%-3% and rheological agent 0.5%-3%; wherein, hydroxypropyl methylcellulose is made from cellulose powder, granular alkali, liquid alkali, methyl chloride and propylene oxide; the preparation method is (1) Weigh each raw material; (2) Mix cellulose powder, granular alkali, liquid alkali, methyl chloride and propylene oxide, carry out etherification reaction, and then carry out neutralization, washing, centrifugation, drying and pulverization in sequence , to obtain hydroxypropyl methyl cellulose; (3) mixing and stirring hydroxypropyl methyl cellulose, starch ether, dispersant and rheological agent to obtain final product. The product obtained by the invention has stable quality, has the function of improving the tensile bonding strength of the tile adhesive, is applied to modern tiles with large size and high quality, and can significantly improve the safety of the tiles in use.

Description

technical field [0001] The invention relates to the technical field of building materials, and more specifically relates to a modified hydroxypropyl methylcellulose for reinforced tile adhesives and a preparation method and application thereof. Background technique [0002] As a decorative material, ceramic tiles have a vast market, but with the continuous improvement of the specialization of the ceramic tile market, more and more consumers are pursuing the seamless effect of wall decoration, making large-scale ceramic tiles more and more popular. At the same time, large-area The increasing popularity of residential buildings has also promoted the popularity of large-size tiles. As the size and quality of ceramic tiles are getting bigger and bigger, the requirements for safety are getting higher and higher. Traditional tile adhesives have been difficult to meet the requirements, so new tile adhesives have been developed rapidly. [0003] Usually, the main reasons for the ti...

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Problems solved by technology

The internal pressure of the liquid-phase method equipment is small, the requirements for the pressure-bearing capacity of the equipment are low, and the risk is small. After the cellulose is soaked in the lye, it will be fully swollen and alkalized evenly. Well, products with relatively uniform substitution and viscosity can be obtained, and the variety is easy to replace, but the reactor should not be too large (generally within 15m 3 Below), the production capacity is relatively small, and if the output is to be increased, multiple reactors must be added, and the reaction process requires a large amount of organic solvent as a carrier, and the reaction time is also long (generally more than 10 hours), which increases solvent distillation recovery and time cost

The gas-phase method has compact equipment, high single-batch yield, and the reaction is carried out in a horizontal autoclave. The time (generally 5-8 hours) is shorter than that of the liquid-phase method, and does not require a complicated solvent recovery system. After the reaction is completed, the excess methyl chloride And the by-product dimethyl ether enters the recovery system in the form of gas, and is recycled and reused separately. The labor cost is low, the labor intensity is low, and the production cost is lower than that of the liquid phase method, but the investment in equipment and automatic control is large, and the technical content is high. Expensive

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