Coating classification: elastic putty

Core tip: Introduction: Elastic putty is a kind of putty used for caulking Its state is similar to that of thick paste Because it has a certain expansion rate, it is called "elastic putty" Effect: Filling and filling putty is the main supporting material for coating Its main function is to fill the large pit and fill the small gap of the wall base, so that the coating can be painted on the basic flat surface, thus obtaining good decoration effect For elastic putty, its filling effect is mainly reflected in filling cracks Most of the outer walls of the building are water Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: Introduction: elastic putty is a kind of putty used for caulking, its state is similar to thick paste Because it has a certain expansion rate, it is called "elastic putty" Function: filling and leveling putty is the main supporting material for coating Its main function is to fill the large pit and fill the small gap in the wall base, so that the coating can be painted on the basic flat surface, so as to obtain good decoration effect For elastic putty, its filling effect is mainly reflected in filling cracks Most of the external walls of buildings are made of cement-based materials, such as cement plaster mortar, cast-in-place concrete or plaster cement paste Due to the inherent physical properties of cement-based materials, cracks will inevitably appear on the surface These fractures generally have the property of "dynamic fracture" The so-called "dynamic fracture" refers to the change of opening or closing of these cracks due to the change of external environment conditions, alternation of dry and wet, temperature rise and fall, etc When the ordinary putty is used to fill these cracks, it is difficult to adapt to the opening or closing changes of "dynamic cracks", and then causes certain damage to the coating film, or even cracks in the coating film When using strong putty to repair these cracks, the elasticity of elastic putty film can accommodate the change of cracks to a certain extent, so that the change of cracks is not transferred to the film In addition, rigid materials (such as cement, gypsum, etc.) are easy to produce cracks after being affected by external factors (such as temperature difference, dry and wet, settlement, etc.) in a large number of wide-ranging interior decoration Joint joints between materials of different materials (such as wood, gypsum and cement) are filled with ordinary putty, which is easy to appear cracks due to environmental changes after coating These cracks can be filled with elastic putty to a certain extent The surface of inner coating and some outer coating is required to be flat and smooth When the external wall needs to be coated with some special coating, such as metallic luster coating, bright solvent coating, etc., especially high-quality putty is needed to scrape out a smooth coating base surface The effect of shielding turtle crack is cement mortar, clean mortar plastering of wall base, because the dry shrinkage often occurs in the surface width, depth of small cracks This kind of crack is called tortoise crack because it looks like the back shell of tortoise The tortoise crack also has the dynamic properties of "hot expansion and cold contraction" and "temperature rise and dry contraction" If ordinary putty is used, elastic coating is needed to cover the dynamic change of such cracks Using elastic putty in full batch is also an effective way to solve its dynamic change The principle of using elastic putty to solve the dynamic change of tortoise crack is mainly because the elastic putty film reduces the tensile stress applied to putty film and coating film due to the contraction of mortar layer (or neat mortar layer), which makes the deformation decrease in the vertical direction When the mortar layer (or clean mortar layer) shrinks, the crack (joint) becomes wider, the joint part of elastic putty film and mortar is affected by tensile stress, and the bottom part is stretched As the tensile stress itself decreases in the vertical direction of the film, and the elastic putty film is affected by the elastic restoring force after being stretched, the rigid film on the surface of the putty film will not crack when the elastic putty film is covered in the vertical direction of the film; when the deformation can pass through the elastic putty film (that is, the elastic putty film cannot cover the deformation), the rigid film on the surface of the putty film will not crack Crack Performance requirements: ① the construction method of good construction putty is usually batch coating (scraping) Due to the large demand and high construction labor intensity, it must have good construction, otherwise it will directly affect the use of putty The construction performance of putty includes scraping and polishing Puttying refers to the soft, smooth and non sticky feeling when puttying, no curling when the scraper returns to the batch, and proper drying time to facilitate the proper modification of the defect parts of puttying; good polishing performance refers to the fact that puttying is easy to polish and smooth, and is not laborious when polishing Some people think that sanding and physical and chemical properties of putty are a pair of contradictions, that is, putty with high hardness and good physical and chemical properties is not easy to polish, while putty with easy polishing has poor hardness and low physical and chemical properties There is some truth to this understanding, but it is not always true Some putty can be polished by the time difference of strength increase of putty film after drying That is to say, when the putty film is dry and can be polished, the strength (hardness) of the putty will be polished when it grows very high Some putty is easy to polish, but its physical and chemical properties are very good ② Good tensile strength and bonding strength tensile strength refers to the strength of putty film when it is stretched and broken It is especially important for elastic putty Bond strength refers to the binding force between putty and base It is well understood that putty film is required to have certain bonding strength and tensile strength That is to say, the putty film should be able to have a firm bond with the base layer, and be able to withstand certain external force without breaking (cracking); that is to say, it can better produce a firm bond with the film on it ③ Proper elasticity (finger cracking) is not required for the elasticity of ordinary putty, but the elastic putty film must have good elasticity, so that it can produce certain elastic deformation without fracture when subjected to external force, that is, the putty film can have necessary crack resistance ④ The resistant putty film of corrosive medium is directly applied on the cement-based base, and is often eroded by water and various alkaline substances, so it should have good water resistance and alkali resistance Otherwise, when the putty film is eroded, it may loose, swell and swell, which may cause the film to bulge, bubble or even fall off ⑤ The air permeable putty film is dried from the outside to the inside The surface of putty film is first dried after construction If the air permeability of putty film is not good, the internal water will be difficult to dry through the surface after the surface of putty film is dry, or the time of putty film drying is long, which will affect the construction of the later putty and coating ⑥ As a commodity, storage stable putty should have a certain storage period During the storage period, there should be no obvious change in the performance of putty, and there should be no obvious stratification, caking, agglomeration or separation that affect the quality of putty ⑦ Building putty, especially putty for internal use, which meets the requirements of environmental protection, belongs to interior decoration materials, and must meet the national standards on the limit of harmful substances The content of formaldehyde, ammonia, VOC, toluene, xylene and harmful heavy metals in putty shall be lower than the value specified in the national standard Main technical indicators: Construction: treatment of the base wall ① cleaning the base coating, dust, oil, etc.; ② cleaning the loose, hollowing and shelling parts of the wall; filling the parts with cement mortar in advance; ③ if the wall surface is dry or dry, it is recommended to wet the base surface with water first Methods of use: ① the proportion of external wall flexible putty powder and water is 1:0.4-0.45 Add water first, then add powder and mix with electric mixer for 35 minutes to form paste without particles, The construction can be carried out after 5 minutes of standing and stirring again; ② the batch scraping thickness shall be controlled within 3 mm; ③ the putty shall be watered and cured for 2-3 days depending on the humidity (about 40 ℃); ④ the water content of the foundation wall shall be more than 10%, and the coating time shall be appropriately extended or the anti alkali primer shall be used for the bottom sealing treatment Note: ① the mixed putty slurry shall be used up within 3 hours, and it is forbidden to add the dried material into the putty for mixing and reuse; ② it is suitable for construction under 5-40 ℃ Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,