Water paint common problems: water paint viscosity deviation index The formulation and process of water - based paint remain unchanged. However, the viscosity of the water-based paint produced deviates from the index and is not within the control scope, for three reasons: 1.Water-based paint raw material properties change. Changes such as filler particle size distribution, oil absorption volatile oil absorption of pigments and fillers high viscosity increases. Oil absorption of low viscosity decreases or thickener thickening efficiency drops, often alkali swelling (ASE) and hydrophobic modified alkali swelling (HASE) in the process of storage and transportation because of the vibration producing bubble or cold after the emulsion particle aggregation demulsification, reduces the thickening efficiency. 2.The original measurement is not accurate, especially for small doses of water paint raw materials (such as thickener), with a large scale weighing error when the additive is not completely transferred into the paint, resulting in errors. 3.Changes in pH value may also lead to changes in viscosity. The thickening of alkali swelling (ASE) and hydrophobic modified alkali swelling (HASE thickeners is affected by the pH value of the system. Generally, the thickening starts at a pH value of about 6, and reaches the best at a pH value of about 7.5. Solution Add water to reduce the viscosity of water paint on the high viscosity, add thickener to improve the viscosity of water based paint on the low viscosity . If it's a pH problem, adjust the pH . Pay attention to the stability of water-based paint raw materials, such as strengthening the control of water-based paint raw materials, before weighing, the liquid water-based paint raw materials fully stirred evenly . Improve the accuracy of measurement, the large scale said large amount of water paint raw materials, small scale measurement additives. sinograce chemical is specialized in the formulation of water-borne wood paint raw materials. We have been committed to the research of the properties and production process of water-borne wood paint raw materials . Sinograce Chemical is specialized in the formulation of water based paint raw materials. We have been committed to the research of the properties and production process of water based wood paint raw materials . visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone :+86 0551 63459511

Asked by water-based paint experts: water-based paints appear flocculated in the production process Problem: Our company produced a batch of waterborne paint last week. The formula remains unchanged. After the completion of production, the coating appears a mass flocculent,it is  difficult to remove the filtration, the quality of waterborne coating is reduced. What is the cause? What method can purify? Answer: There are several reasons for the appearance of mass floccus in the production process of coating: 1.The most common is the dispersion of pigments and fillers, and flocculation clumps appear when film additives are added in the conditioning process.The flocculating clumps remain in the paint and are difficult to remove by filtration. 2.Coating production in the thickening process, thickener concentration is high, add too fast, cause local violent thickening, become granule:especially alkali swelling thickener cellulose ether thickener added directly easy to lead to the appearance of the mass. 3.Combination of cellulose ether thickeners and some whitening agents, such as hydroxyethyl cellulose (HEC) and whitening agents, will lead to flocculation clumps, leading to filtration difficulties. Solution: Film forming additives cause flocculation of pigments and fillers,Most occur in low PVC varnish systems(Particle Volume Concentration).Low PVC coating systems are often combined with low ion concentration of hydrophobic dispersant .Due to low PVC, high amount of polymer emulsion, relatively large amount of film forming agent,In the process of adding film forming agent, the solvent will peel the dispersant off the surface of the pigment and the filler to make the pigment and the filler flocculate.In order to avoid flocculation of the system, the film forming auxiliary agent can be preemulsified and then added. The pre-emulsifying composition of film-forming auxiliary can be referred to as the following proportions: film-forming auxiliary, about 5% cosolvent(ethylene glycol or propylene glycol, etc.), about 0.5% high HLB value wetting agent, and 50% ~ 80% water, a total of 100%, which will be added evenly after mixing . For the dispersion that has caused flocculation, add wetting agent appropriately and then disperse at high speed, open the flocculation, and then adjust the paint normally. General wetting agent accounts for about 0.2% of the total amount of paint. The flocculation caused by too fast and too thick thickening agent can be prevented by changing the adding method .For high molecular weight cellulose ether, alkali swelling (ASE) or hydrophobic modified alkali swelling (HASE) thickeners, can be made into a certain concentration of pre-gel, pre-gel form can be added at any stage.Cellulose ether thickening agent can also be added in advance in the process of dispersing color filler, so that the thickening agent is fully dissolved in the coating . Alkali swelling (ASE) and hydrophobic modified alkali swelling (HASE) thickeners can be d...

Asked by water-based paint experts: water-based wood lacquer wood grain display is not clear enough Question: Our company is now doing the first coat of wood lacquer and tried a water-based resin (polyurethane). and there is no problem with the adhesion.The current problem is that after adding color essence, it is applied to the floor and the wood grain display is not clear enough. The amount of the water-based resin is 90%, less than 90%, and the surface wood grain of the board is not enough. The solvent used now is PM and BCS, and no water is added. I wonder why? I hope the experts can give some advice. Answer： Mr. Jiang, thank you for your question. There is no problem with the PM in your recipe. The problem you encounter may be caused by several reasons: 1.The resin you used is not wettable enough. This is because the polyurethane emulsion particles in your formulation system are larger in diameter than the holes in the wood. Accordingly, paint of waterborne wood implement is permeable difference, paint of waterborne wood implement cannot infiltrate the interior of lumber grain and enclothe in lumber surface, enclothe grain of lumber, abate the layering feeling of wood grain. 2.The film forming agent you use may not be compatible with the emulsion you choose. Film forming agents, or BCS, are selective for emulsions. This is because waterborne resin manufacturers control the phase structure of waterborne resin through the selection of monomer,the addition sequence, the use of surfactant amount and other technological conditions.The phase structure of waterborneresins is the technical secret of the emulsion manufacturer.However, suppliers will provide the recommended dosage forms and proportions of the aqueous tree fat they provide. This is why different water-based resins usually require different combinations of additives. In your formulation system, when the amount of water-based resins is higher than 90%, the compatibility problem of emulsion is not obvious because the amount of other additives is relatively small, and the wood grain is quite clear. On the contrary, in the case of the amount of water-based resin less than 90%, the amount of other additives relative increase, emulsion compatibility problems become obvious, wood grain also therefore appear "Board surface blur”. We suggest that you adjust the current resin varieties or film forming agent varieties. Among sinograce chemical customers, Water based wood paint are our ustomers to use High Solid Water -based Polyurethane Dispersion PU - 402 has good response.Or our Special resin polymer pf-136, with small particles, good permeability and little selectivity for film-forming additives, is also the acrylic resin for water-borne wood lacquer. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone :+86 0551 63459511

Common problems with water-based paint: oil slick surface of paint Problem: The finished product has floating black spots or impurities on the surface. A lot of coating produce technical personnel to had encountered similar problem, there is in coating production process "small bubble" or small black dot cannot eliminate. Carefully examine these "little bubbles" ~ they are actually small black oil spots. Under a 20x magnifying glass, a small white powder substance can be seen in the center of the oil dot. Analysis: Small black oil is usually brought in by the filler oil, change a batch of raw materials, small black oil problem disappeared. The application effect of finished coating with floating black oil spots is not good. Because the black oil spots are incompatible with the coating system, the oil spots embedded in the film become defects after the film is formed.Because black small oil dot is mixture of oil, pink, participate in coating to become film, its composition and coating other component are different, produce stress in besmear film dry process, bring about the besmear film around black small oil dot to contain smalf crack. Solutions: 1. For the finished coating with floating black oil dots, the base material wetting agent and an appropriate amount of emulsifier can be appropriately added to make the small black oil dots without tank capacity, like pigment particles, enter the paint system after absorbing the wetting agent and no longer affect the appearance of the coating and film. 2. Strengthen the quality control of raw materials. 3 In the paint formula, try to introduce hydrophobic dispersant, can prevent the occurrence of this problem. Sinograce Chemical co., LTD produces water based paint ，chemical additives for water based paint, such as defoaming agent, thickening agent, leveling agent, wetting agent visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone :+86 0551 63459511