Uncovering the role of elastic waterproofing interfacial agent in plastering gypsum
1 Types of interface agent
Interfacial agent is a general term for a class of materials used to improve or completely change the physical and technical properties of the surface of the material and the chemical properties of the surface by treating the surface of the object. According to the scope of application, it includes concrete interfacial agent, extruded plastic board interfacial agent, rock wool board interfacial agent, ceramic tile interfacial agent, plaster and gypsum with interfacial agent, and so on. According to the composition can be divided into 2 categories:
1, dry powder type interface agent, dry powder interface agent by cement and other inorganic cementitious materials, fillers, polymer powder and related additives composed of powder. It has high adhesion, excellent water resistance and aging resistance. When used, it is mixed with water and used in a certain proportion.
2、Emulsion type interface agent, emulsion type interface agent is made of chemical polymer material as the main component, supplemented by other fillers. Emulsion-type according to its composition and applicable grass-roots level is divided into single-component and two-component, two-component products need to be used in proportion to the mixing of cement. Single-component emulsion-type interfacial agent can be used only by mixing water proportionally.
2 Composition of interface agent for plaster
It adopts special elastic acrylic emulsion as the main ingredient and a variety of additives compounded into emulsion-type interface products. It has excellent permeability, can fully moisten the surface of substrate, make the grass-roots level dense, and improve the adhesion of smooth interface. It is suitable for surface treatment of substrates such as concrete, autoclaved aerated blocks, autoclaved fly ash bricks, aluminum molds, assembled wall panels, capillary networks and so on. Generally called elastic waterproofing interface agent.
3 Functions of elastic waterproofing interface agent
■ Improve bond strength, after the concrete construction demolding, the smooth and dense concrete surface is easy to cause subsequent construction difficulties and later engineering defects, such as plastering mortar cracking, drumming, peeling phenomenon, especially in the aluminum mold wall such problems are more serious. Spraying elastic waterproofing interfacial agent on the smooth and dense concrete surface can improve the bonding strength between plaster and wall base. Experiments have proved that the tensile bonding strength of the plaster layer and the base can be increased by more than one times when the wall coated with the interfacial agent is tensile-tested and the damage interface is located in the block wall.
■ Reinforcement of substrate, aerated concrete blocks, lightweight panels with low surface strength, spraying elastic waterproofing interfacial agent on its surface can enhance the mechanical strength of the surface of the wall materials, improve the bonding strength of plaster and wall substrates.
■ With certain waterproof and moisture-proof function, gypsum hygroscopicity is very strong, especially the bathroom backhand wall, the window around the wall moisture moisture is large, through the interface agent treatment, can effectively reduce the moisture on the indoor putty, paint, wallpaper damage, reduce putty chalky, moldy, crusting risk.
Bathroom backhand wall putty mold ▲
■ Reduce substrate water absorption, aerated concrete blocks and lightweight panels with high water absorption, easy to cause plaster plaster loss of water and can not be completely hydrated, low strength, easy to de-powdering, through the interfacial agent treatment, can effectively reduce the substrate’s water absorption, to ensure that the hydration of gypsum environment is stable, and at the same time, greatly improve the slipperiness of gypsum mortar scraping. Seal the air holes on the surface of concrete, avoid or greatly reduce the problem of air bubbles produced by plastering gypsum during construction.
The grass-roots level does not do the interface agent off the powder serious ▲
Serious air bubbles when the interface agent is not done on the base layer▲.
High elasticity, effectively buffer grass-roots stress deformation, grass-roots walls due to environmental changes in temperature, humidity, themselves always occurring contraction and deformation, uneven settlement of the shear force impact, through the interface agent treatment, can buffer or eliminate the interface between the wall dry shrinkage of the wall material stress accumulation, effectively reduce the plaster layer of the hollow drum, cracking. Have done the interface agent and did not do the interface agent of the plate, we test its buffer stress effect under the deformation of 3 centimeters, it can be clearly seen that have done the interface agent of the plate, plaster and grass-roots level is not stripped (hollow drum).
The surface agent is not treated for cracking of hollow drums ▲
The surface agent treatment of the non-drumming and cracking ▲▲
Compared with the common interface products of 108 adhesive and color paste or interface products with low solid content, the elastic waterproofing interface agent is a high-performance interface treatment material, non-toxic, tasteless, green and environmentally friendly.
4 Standardized construction process
● Proportion: emulsion: water (1:3) ratio
● Consumption: 0.05kg/m2 (emulsion)
● Construction thickness: 40um
● Standardized construction process: mix the interfacial agent according to the proportion, and make it fully mixed with a mixer, spray or roll coating, spraying, spray gun tip from the wall spacing of about 30cm, into a 45-degree diagonal spraying, the spray gun should be from the top to the bottom, from the left to the right uniformly S-type route spraying 2 times, to ensure that the interfacial agent is evenly sprayed. Surfacer spraying is completed, the appearance of light blue, touch the viscous and scraping the surface of the block without powder. Spraying completed 2 hours after the next step of the process can be carried out.
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