For example:(1) porous super absorbent material (aerated concrete, gypsum board, wood, etc.);
(2) Smooth and other low-absorbent materials (cast-in-place concrete, etc.);
(3) Non-porous non-absorbent materials such as PVC, benzene board and other organic material plates, glazed tiles, etc.), so that the hydraulic cladding material can not be fully hydrated or mechanically embedded in the form of anchoring force, affecting the bonding force and integrity;
(4) Because the physical and mechanical properties of the substrate in the subsequent cladding material, such as deformation (shrinkage, expansion) and thermal expansion coefficient, elastic modulus, strength and other differences in internal stress, resulting in bonding failure. All of these situations require the use of interface treatment agents to enhance the bonding force between the two materials (to avoid hollowing, cracking, and shedding). In a physical sense, the interface treatment agent is essentially a two-way affinity building binder.
What are the main applications of interface mortar?
General buildings and building components are required to make mortar plaster layer, which plays a protective role on buildings and walls to resist the erosion of wind, rain, snow and other natural environments on buildings, and improve the durability of buildings, while achieving dense, smooth and beautiful decorative effects, all of which are based on the effective bonding of the plaster layer and the substrate. The dry powder interface treatment agent for construction is widely used in the plastering of walls, preventing hollowing, the bonding layer of post-pouring belts, and the renovation of old walls. It is particularly worth mentioning that, while ensuring effective bonding, the interface treatment agent often avoids watering the substrate, especially the lightweight block that produces dry shrinkage deformation due to watering, and also plays a role in preventing dry shrinkage cracking and stabilizing the substrate, which is the market with the largest amount of the material. In addition, in many dense materials that are not easy to be bonded by mortar, the interface treatment agent, as an indispensable auxiliary material, also has a certain market.
What are the advantages of interface mortar?
Interface mortar has the following advantages:(1) it can close the pores of the base material, reduce the absorption of the wall, achieve slow resistance, reduce the moisture in the lightweight masonry suction cladding mortar, and ensure the cladding mortar material to bond and gel under better conditions;(2) consolidation, improve the surface strength of the base material, and ensure the bonding force of the mortar;(3) undertake the bonding bridging effect between masonry and plaster, ensure that the upper wall mortar and masonry surface are more easily combined into a solid whole;(4) It has permanent bonding strength, does not age, does not hydrate and does not form a membrane structure that affects durable bonding;(5) The secondary watering process before plastering is exempted to avoid dry shrinkage of the wall. Interface treatment agent according to the material classification can be divided into organic (water-soluble epoxy resin, acrylic acid, E Ⅴ A emulsion, etc.), inorganic, organic and inorganic composite three categories; according to the finished form can be divided into solid, liquid, solid-liquid double button three. Dry mortar interface treatment agent mostly contains water retention agent, high molecular polymer (produce intermolecular physical binding force), belongs to the powder mixed with water available single group of products.
What is the interface agent]
Interface agent is a kind of adhesive, generally made of vinyl acetate-ethylene. With super adhesive force, excellent water resistance, aging resistance. Improving the adhesive strength of the plastering mortar to the base layer can effectively avoid the problems such as hollowing, shedding, shrinkage and cracking of the plastering layer. It is used to deal with the surface of concrete, aerated concrete, lime sand brick and fly ash brick, etc., to solve the problem that the interface is not easy to bond due to the strong water absorption or smoothness of these surfaces, resulting in hollow drum, cracking and peeling of the plaster layer. Can greatly enhance the adhesion between the old and new concrete and concrete and plastering mortar. It can replace the traditional chiseling process of concrete surface and improve the plastering process of aerated concrete surface. It is an indispensable supporting material for modern construction and decoration construction. Interface agents are usually used on concrete surfaces because the concrete surface is too smooth. Through the use of this product, can make the grass-roots surface becomes rough, can increase the cement mortar on the grass-roots adhesion, avoid plaster layer hollowing shell, so as to replace the artificial chisel treatment process. It can also be directly brushed with the back of the ground material, depending on the material.

1. base treatment
1. The cement on the new wall should be cured for at least one month, so that the alkalinity of the wall surface should be properly reduced and the wall surface should be dried thoroughly. The moisture content of the wall surface should be lower than 10%; If the ambient temperature is low, the waiting time of the wall surface will be extended accordingly.
2. Remove dust and other adhesion on the surface of the base layer. When the wall is flushed with zinc sulfate solution or dilute hydrochloric acid solution, the oil is cleaned with detergent, and finally washed with water.
3. Check the substrate for signs of hollowing
If the hollowing is not handled, the coating film will eventually fall off with the hollowing part of the substrate. Therefore, after the discovery of hollowing should stand......

According to the requirements of Weihai Quality Supervision Station in Shandong Province, starting from October 1, 2016, the design unit shall clearly use water-resistant putty in the construction drawings for the above-ground public parts such as stairwells and corridors of new residential construction projects that need to be scraped with putty, as well as the walls of stairwells and elevators of new public construction projects. For new public buildings, underground garages, basements and other public parts that need to be putty and are susceptible to damp, the design unit shall clearly use water-resistant putty or exterior wall putty in the construction drawings. (From Weihai Evening News)
The purpose is clear: to prevent the building indoor public parts of the wall

Putty layer empty drum, the origin of the bubble
Putty layer hollowing, foaming, mainly due to the presence of gas between the base and the putty layer. There is a dense layer between the base layer and the putty layer. If the interface agent does not add water for interface treatment, the air cannot normally diffuse to the base layer. Improper handling of the grass-roots level, so that the putty layer and the grass-roots contact is not close enough, the formation of interlayer.
Steps of scraping putty powder
1, putty powder generally after mixing evenly, let stand for 15 minutes, let the various ingredients fully wet and dissolved, and then use the electric mixer to stir again on the wall.
2, putty construction should be in the wall repeatedly batch scraping, grinding......

Putty adhesion will directly affect the construction quality of the coating. Many projects only found poor putty adhesion in the construction process. However, the construction of exterior wall putty has been completed in a large area. Considering various factors such as construction period and cost, it is no longer possible to replace exterior wall putty. In this case, is there any way to improve putty adhesion?
Encountered the construction of the project, found that the external wall putty adhesion is poor, can through the following several ways to improve the putty adhesion:

In recent years, China's thermal insulation building materials market has developed rapidly, but there are also some problems. The investigation found that there were continuous cracking and shedding events of thermal insulation mortar of external wall thermal insulation layer, local cracking and shedding, and large area shedding phenomenon. Since the dry density of the thermal insulation mortar layer is 20kg/m3, if it falls from tens of meters, the damage to people or things on the ground is very huge. Today, Tianjin Sanxing Mortar Factory will give you a deep analysis of the causes of cracks in the mortar layer of the external wall insulation system.
Cause Analysis of Cracks in Plaster Mortar Layer of Exterior Insulation System Caused by 1. Material Factors