A kind of water-resistant paper-faced gypsum board and its preparation method

Abstract

The invention provides a water-repellent paper-surface plasterboard. The water-repellent paper-surface plasterboard comprises the following components in parts by weight: 100 parts of desulfurized plaster powder, 2.5-4 parts of emulsified wax, 0.3-1.0 part of starch, 0.03-0.12 parts of a foaming agent and 65-85 parts of water. The paper-surface plasterboard disclosed by the invention has the function of water repelling since emulsified wax is used as the water repellent, can be put in a plaster slurry network structure through paraffin to bloke air pores in plaster, and the function of water repelling is based on the physical action and is not influenced by plaster impurities; as the requirement of the emulsified wax for the purity of plaster is relatively low, the plasterboard disclosed by the invention has better water repellent effect, and when the mixing amount of the emulsified wax is 2.5-3 percent, the water absorption rate of the water-repellent paper-surface plasterboard soaked in water for 2 hours is lower than 10 percent; and when the mixing amount of the emulsified wax is 3.5-4 percent, the water absorption rate of the water-repellent paper-surface plasterboard soaked in water for 2 hours is lower than 5 percent.

Description

technical field [0001] The invention relates to a gypsum board, in particular to a water-resistant paper-faced gypsum board using desulfurized gypsum as a raw material and a preparation method thereof. Background technique [0002] Ordinary paper-faced gypsum board is a board made of building gypsum as the main raw material, mixed with appropriate amount of additives and fibers as the board core, and made of special board paper as the protective surface. Because of its light weight, sound insulation, heat insulation, strong processing performance, and simple construction methods, it is widely used in residential buildings, office buildings, hotels and other places. However, due to the high solubility of gypsum in water and low softening coefficient, it is not suitable for application in humid environments. [0003] For a long time, the application of waterproofing agent is an important way to improve the water resistance of gypsum boards. In the past, when various enterpri...

AI Technical Summary

Problems solved by technology

However, due to the large amount of impurities in desulfurized gypsum, these impurities will have some negative effects on the hydrogen-containing silicone oil waterproofing agent, which will cause the 2h water absorption rate of the product to fail to meet the requirements of less than 10%. The requirements are getting higher and higher. Some customers require that the 2h water absorption rate of water-resistant gypsum board be less than 5%, but it is difficult to produce water-resistant boards with a 2h water absorption rate of less than 5% using silicone oil as a waterproofing agent.

At the same time, the addition of silicone oil waterproofing agent will increase the unit weight of the board. Moreover, there will be some factors that affect environmental safety such as the release of VOC and fine particles below PM10 during the use of silicone oil waterproofing agent.