Study On Water-base Block Type Nano-paint

The research and development of nanometer paint has achieved industrialization in some fields, including limousine finish paint for its heterochrosis property along with angle,military stealthy paint,insulated paint,etc ,the research and development on electrostatic shield paint and photocatalysis selfpurging paint has also succeed and achieved industrialization . The domestic R&D of nanometer paint mostly focus on improving the weathering resistance of building external wall paint and the germ resistance of building internal wall paint, but there is very little research work on industrial nanometer paint and base material of paint.now at home and abroad most developed nanometer paint are nanometer particle filled modified paint, they are produced by use traditional polymer emulsion as base material and nanometer particle filled in it, because the base material not be altered so the property improved is not too, and there are not nanometer paint using nanometer level polymer emulsion as film forming matter. In this paper, we use the special technology of the molecule self-assembly polymerize and crosslinking to prepare the nanometer emulsion of the acrylate copolymer without using emulsifying agent. It is the macromolecule emulsion of nanostructure prepared by simple two block polymer or copolymer. Compared to a certain dispersing medium (for example,H2O),these polymer can form spherical micelle(within nanometer scale,50-90nm)in this micelle , the shell of the micelle is made up of the polar chain segment, and the nuclear of the micelle is made up of the non-polar chain segment, so the emulsion sysTEM is stably dispersed. In addition, these polymer contain the chain segment structure that can be oxidative crosslinking or heat crosslinking, so these nanometer-level polymer particle can be assembled in proper conditions, just like some micromolecule surface active agent, the emulsion has a special double-continuous structure in the transformation process of positive phase and reversed phase, and the sysTEM can keep isotropy in the process of continuous phase change. The average particle diameter of this nanometer level polymer emulsion can achieve 72nm,and can self-crosslinking in normal TEMperature, and also can be free dispersed in water, no deposition, and have a good dispersion with the pigment, so can prepare perfect water-base block nanometer paint. This nanometer polymer emulsion use hydrophobic resin as one of base material component of the paint, the component provide tolerance ,aridity and adhesion to the paint; use hydrophilic resin as one of base material component, the component provide stability to the emulsion and provide affinity and dispersibility to the pigment filler;After being homogeneous mixed, in the condition of high velocity shearing and agitating, the copolymer of these two polymer emulsion being dispersed in the pre weak-alkalized Tru-Sealer to be the core of emulsion particle; and use softened water as disperse medium. The water-base block nanometer polymer emulsion made up of these four main feed, can be used as base material to prepare water-base block nanometer construction paint, nanometer industrial paint, etc. We have used CENT to test the particle size of the nanometer polymer emulsion at Hong Kong University. The result showed that the particle size of the emulsion is between 54nm and 89 nm, and its average particle size is 72nm. Because of minisize effect and large specific surface area, nanometer paint can form more dense, smooth and stronger adhesion capacity film coating compare to common paint, and so it can effectively prevent the penetration of water, oxygen and ion, to achieve the performance requirement of scrub resistance and anticorrosion. In this paper, we further analyze how the reactive condition affect the particle size of the emulsion. The result indicate that the particle size of the emulsion gradually decrease with the TEMperature rise, but when the TEMperature reach 100℃,the particle size gradually increase with the TEMperature rise. When the reaction TEMperature is about 100℃, the particle has a minimal size. This is because the decomposition TEMperature of the initiating agent is between 90℃and 100℃, so when react at this TEMperature, the amount of the free radical is the largest, the amount of the reaction point and the nucleating particle in the sysTEM is larger, as a result, the particle size issmall. When the TEMperature is above 100℃, the chain-termination is occurred because of a part of free radical lose their reactivity, and the amount of the nucleating particle is less, so the particle diameter is larger, the particle size of the polymer emulsion gradually decrease with the increase of the initiating agent's concentration.The higher the initiating agent's concentration is, the smaller the sysTEM product's particle size is. This is because the higher the initiating agent's concentration is, the larger the amount of the initiating agent is, and also the amount of the reaction center and the amount of nucleating particle, so in the same condition, the particle size of the sysTEM is smaller; the particle size of polymer emulsion is gradually decreasing with the increasing of water content. Because compared to monomer concentration, the larger the water content is , the lower the sysTEM's concentration is, in the same react condition, the amount of reactive monomer is lower at each reaction point, so the particle size is smaller; the particle size of polymer emulsion is gradually decreasing with the increasing of agitating speed. The higher the agitating speed of shear emulsification is, the stronger the mechanical shearing force is, the harder the primary nucleating particle's agglomeration is and the higher the stability is, so the particle size of the sysTEM's product is smaller. Besides nano-emulsion, in this paper we also discuss the effect of other components on the paint's performance, such as dispersing agent, wetting agent, thickening agent. The result shows that the viscosity of the sysTEM gradually decrease with the content of dispersing agent increase, the minimum of the viscosity occurs when the content of dispersing agent reach 4%, when the content of dispersing agent is above 4%, the viscosity of the sysTEM gradually increase for re-flocculate; the wetting and dispersing of pigment in the paint base are very important, they have a great effect on the quality of the paint. The wetting agent play a critical role on many performance of the paint, it can shorten the time of grid dispersing , reduce the consumption of energy and make the dispersing sysTEM of the paint keep stable. If the molecular weight of resin or wetting agent added is too high, wetting power will be obviously decreasing , so the molecular weight of the wetting agent should not be too high; we choose proper thickening agent to control the viscosity of the nano-paint which pigment volume content is high, make sure there be no demixingduring the course of storage, considered using HEC, thickening agent of alkali swelling to match with the thickening agent of association, pigment filler and dispersing sysTEM also should be adjusted. To the nano-paint which pigment volume content is moderate, we use the thickening agent of alkali swelling to match with the thickening agent of association. To the nano-paint which pigment volume content is low, we generally use the thickening agent of alkali swelling to match with the association thickening agent of newtonianism; the foam amount of unit area gradually decrease with the increase of the content of the antifoaming agent, when the content of the antifoaming agent is above 4%, there will be shrinkage cavity, pinhole and fisheye on the film. So the maximum of antifoaming agent's content is 4%. In order to get reliable and representative result by using as few test times as possible, we analyze the test result and choose the better test condition, namely the optimum combination of each paint's component. In this paper, we make a optimization design on the formula of water base block nanometer internal wall paint by using orthogonal experimental design. The test result shows that the best horizontal combination is A1B1C2,namely the content of the dispersing agent is 0.2%, the thickening agent of alkali swelling polyacrylic acid emulsion is 4.7%, the thickening agent of non-ionic association polyurethanes is 1.4%. In this paper we also studied the synthesis of nanometer emulsion and manufacturing technology of some paints, these paints including water base block nanometer internal wall basal face paint, external wall basal paint and shield basal paint of metal, we studied the structure and performance of the polymer by means of TEM, DSC and IR, and detected each performance of the paint according to the national standard of paint detection. The result showed that each performance of water base block nanometer paint is better than that of ordinary paint and nanometer modified paint. In this paper, we use a special technology of the molecule self-assembly polymerize and crosslinking to prepare the nano-emulsion of the acrylate copolymer without using emulsifying agent, and use this nano polymer emulsion as film forming material to prepare many high performance paints with the capability of water dispersion, self-crosslinking at normal TEMperature and can be grinded, these paints include water base block nanometer internal wall paint,nanometer external wall paint and nanometer industrial paint. The test result showed that the water base block nanometer structure paint basically eliminate each problem of normal paint and nanometer filled modified paint, making a great improvement in the performance of application, so can be widely used in architecture, industry, automobile, railway, ship and aviation, etc.