Coating classification: water resistant putty powder for interior wall

Core tip: Introduction: In the past, the construction putty used to be temporarily prepared by the coating workers at the construction site by using liquid glue Due to the influence of the site deployment conditions and the quality of the deployment personnel, it is easy to cause the quality of the putty to be unstable The internal wall putty products commonly used have problems such as poor water resistance, low bonding strength, poor adhesion, easy peeling, powdering, etc In recent years, people have started the research, development and application of powder putty This kind of putty can be used only by mixing the putty powder with water according to a certain proportion, which not only keeps the environmental protection characteristics of the water-based putty, but also solves the utilization well Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Home of coatings: Introduction: Architectural putty used in the past All of them are temporarily prepared by the coating workers at the construction site by using liquid glue Due to the influence of on-site deployment conditions and the quality of deployment personnel, it is easy to cause the quality of putty to be unstable The putty products used for the interior wall generally have problems such as poor water resistance, low bonding strength, poor adhesion, easy peeling and pulverization In recent years, people have started the research, development and application of powder putty This kind of putty can be used only by mixing the putty powder with water according to a certain proportion, which not only keeps the environmental protection characteristics of water-based putty, but also solves the random problem of temporary preparation of liquid glue in the construction site However, there are still a large number of non water resistant dry powder putty in unrestricted use, resulting in peeling and pulverization of some inner walls, which bring a lot of troubles and waste to users Therefore, in view of the existing problems of putty, a kind of water-resistant putty powder with simple ingredients, environmental protection, good water resistance, easy construction and low cost is developed The water-resistant putty powder for interior wall is made of high polymer, high-quality grey calcium, heavy calcium carbonate and various additives Features: Formula Design: 1 Cementitious material is the main material to make putty have bonding strength At present, there are two kinds of materials widely used in dry putty: one is inorganic material, such as white portland cement and hydrated lime; the other is organic material, generally some glue powder and modified starch that can be quickly dissolved in water Lime calcium powder and white cement as cementitious materials have the advantages of wide sources and low price, but they are all strong alkaline materials Simply using this kind of materials to scrape the wall will cause quality problems such as cracking and paint blooming due to large shrinkage In the past, they were widely used, and now they are not only cementitious materials Organic rubber powder has the characteristics of fast dissolving in cold water and good bonding performance In recent years, it is used more and more in putty However, due to being used alone as cementitious material, the water resistance of putty is poor, and it is easy to be powdered, peeled and other phenomena, thus affecting the use function Therefore, combining the advantages of inorganic materials and organic materials, the preparation of high-performance building putty is the main direction of development at present and in the future 2 Filler is the most widely used material in putty, which has a great influence on the scraping and polishing of putty At present, the inert filler of putty mainly includes heavy calcium carbonate, light calcium carbonate, talcum powder, etc the main requirements are wide source, low price, and certain requirements for fineness and whiteness At present, heavy calcium carbonate, a small amount of light calcium carbonate and talcum powder with coarse particle size are used as fillers to prepare dry putty Because a large amount of heavy calcium carbonate with coarse particle size is not only conducive to reducing the cost of putty, but also the particle size is relatively coarse, the demand for cementitious materials is relatively reduced, or the performance of putty can be relatively improved with the same amount of cementitious materials; a small amount of light calcium carbonate can improve the puttying and sanding performance of putty; the talcum powder itself has a sense of greasiness, which helps to improve the puttying performance, Reduce the amount of organic materials 3 Auxiliaries ① the water holding property of putty with water holding thickener is directly related to its batch scraping property, and the putty with good water holding effect is smooth, time-saving Labor saving, so the selection of water retaining materials is very important At present, the commonly used materials are mainly all kinds of cellulose ethers These materials have a wide range of sources and are easy to use They are the mainstream products of water retaining agent used in putty industry at present However, the viscosity and dosage control should be paid attention to when they are used, and the speed of water solubility should be paid attention to ② Defoamer dry powder putty uses a lot of organic additives When these materials are stirred together, a large number of bubbles will be introduced, which will be directly brought into the putty products During putty construction, fine holes are easy to appear, which will affect the apparent effect and use performance of the materials Therefore, defoamer can be added to reduce the generation of bubbles ③ Preservative dry powder putty is a kind of water-based material After construction, if it is in humid air, it is easy to get moldy and other phenomena, thus affecting the use function Therefore, adding a certain amount of dry powder preservative to putty powder is the basis to ensure the long-term use of the material The selection and dosage of preservative should be determined according to the putty system and the use position Research technology and formula: development roadmap test formula One of the main properties of water-resistant putty for interior wall - water resistance directly affects the quality of putty products Rubber powder can provide good bonding performance, but the water resistance is generally poor, and the cost is too high when the usage is large Therefore, white cement and lime calcium powder are important components of single component water-resistant putty, and they are important raw materials to give high bonding strength, high water resistance and high cost performance First of all, the lime calcium powder reacts in the air to form a hard calcium carbonate high-strength waterproof layer, and the cement reacts with water to form a high-strength cementitious material Therefore, a certain amount of white cement and lime calcium powder can fully ensure that the bonding strength and water resistance of the putty meet the requirements of the standard, but the amount of admixture should be determined through a detailed proportion test Hydroxypropyl methylcellulose has good dispersibility and cold water instant solubility, which provides good water retention performance for putty, so as to ensure that the putty is smooth and delicate during construction However, its main disadvantage is that the surface of putty film bubbles and produces fine holes when it is applied, which affects the smoothness of putty layer The use of defoamer with it can make up for this defect and get a good leveling effect See Table 1 for the formula of water-resistant putty for interior wall determined through test and research Production, storage and transportation: the production process of building dry powder putty is relatively simple, and the required equipment is also relatively simple, mainly including raw material warehouse, feeding equipment, weighing equipment, mixing equipment, packaging equipment, etc Although the process is relatively simple, there are some points to be noted, which are briefly summarized as follows: ① Selection of putty raw materials: there are many kinds of putty raw materials and many manufacturers, so when selecting raw materials, enterprises with stable raw material quality and supply should be selected on the basis of full test, so as to effectively ensure the quality and stable supply of final putty products ② Storage and preservation of raw materials: due to the production of dry powder putty, all raw materials are required to be stored in a dry environment, especially some inorganic cementitious materials, not only to ensure the storage conditions, but also to timely clean up expired products ③ Production of putty: before the production of dry powder putty, all equipment shall be cleaned up Since many production lines produce several products at the same time, especially mortar products, there will be a certain amount of sand left in the equipment, which has a great impact on the quality of putty (constructability), so ensuring the cleanness of the whole production line equipment plays an important role in ensuring the quality of putty Each batch of putty shall be subject to corresponding spot check to ensure the quality is qualified ④ The finished dry powder putty shall be stored in batches and stages, and the humidity of storage shall also be paid attention to The products which have been stored for a relatively long time but have not passed the warranty period shall be sampled again to confirm whether they can be used If the quality fails to meet the standard, they shall be cleaned up in time ⑤ The putty shall be transported by batch, so as to track and trace the source in time in case of problems found in the later stage, and avoid rain during transportation and storage again Performance and technical indicators: Construction: Usage: ① powder: water = 1:0.35; ② add a proper amount of water into the barrel, pour putty powder into the water, while pouring, fully mix the putty with an electric mixer for 3-5 minutes, until the putty is uniform and free of particle paste, and it can be scraped for use after standing for 5-10 minutes; ③ Due to the different flatness and construction level of the base course, the consumption of putty for each time is different, generally 0.6-0.8kg/m2 Note: ① the new cement mortar shall be maintained for 4 weeks in winter and 3 weeks in summer, and the putty construction shall not be carried out until the base course is completely dry The moisture content of pressure ball base course is less than 8%, pH is less than 10; ② ensure that the base course is solid and flat, clean and free of stains, floating ash and looseness, and the defect of base course should be repaired and leveled; ③ the mixed putty should be used up within 3 hours, and the putty that is too dry and hard should not be mixed with water for reuse; ④ construction environment: 5-40 ℃; ⑤ The product shall be stored in a dry place and shall not be exposed to the sun, rain, damp or frost Home 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