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The modified coating material acrylic resin performance analysis and prospects

Acrylic resin has light color, high transparency, shiny and plump, tough coating, strong adhesion, corrosion resistance and other characteristics of the coating material. Acrylic resin in certain situations, there are some defects, such as hardness, stain resistance, solvent plastisol coated chain resistance, mechanical properties are not good enough and high costs limit its further application N4O. In recent years, with the the polymerization of continuous improvement and development of technology, as well as people on the importance of environmentally friendly products, acrylic resin modified by the extensive attention. Domestic and foreign scholars have carried out a large number of in-depth research, the use of organic silicon, organic fluorine, epoxy, polyurethane, nanomaterials modified acrylic resin, achieved fairly good results. In this paper, the research and application of acrylic resin modified in recent years to make an introduction.
        The acrylate polymer itself is missing on the crosslinking points in thermoplastic, linear molecules, it is difficult to form a three dimensional network crosslinked film and therefore its water resistance, stain resistance is poor, low-temperature brittle, high temperature prone YS. Silicones P)-Q bond energy of 9: 1 RS TE "7 B is much larger than the U-U bond energy of 9 3> 4 RS TE 7 B, inner rotational energy barrier is low, easy to rotate, large molecular volume, small surface energy, and has a good resistance to ultraviolet light resistance, weather resistance, stain resistance and chemical resistance. Silicone modified acrylic emulsion, acrylic emulsion thermoviscoelastic brittle cold, weather, water can improve performance, expand the scope of its application to the field of adhesives, exterior paint, leather finishing agents, finishing agents, and printing N0O.
       Silicone modified acrylic resin include physical modification and chemical modification method. Organosiloxane physically modified acrylate emulsion method usually has 0:! Organosiloxane monomer directly as an accelerator and a coupling agent was added to the acrylate emulsion modified V "first organosiloxane an emulsion, and then it is modified to fight with acrylic emulsion was cooled, the chemical modification method is based on the chemical reaction between the polysiloxane and the polyacrylate, so that the silicone molecule, and polyacrylic acid ester combine a method by chemical modification, can improve the compatibility of the polysiloxane and the polyacrylate, inhibiting the migration of the silicone molecules to the surface, so that the two uniformly dispersed so as to improve the polyacrylate copolymer The purpose of the physical and mechanical properties of the emulsion
The following three methods can be used, depending on the silicone material:
        Double bond-containing siloxane, especially a double bond-containing siloxane oligomer with acrylic monomers that build the side chain containing the comb-shaped copolymer or main chain of the siloxane containing siloxanes copolymer V siloxane with a hydroxyl group with a hydroxyl group-containing acrylic resin by a condensation reaction generates a graft copolymer V # hydrogen-containing polysiloxane with acrylic acid ester in the polymerization is carried out under the role of the platinum catalyst N3O ​​ANISSA WONG SEAN etc. N: O containing ethylene functional groups organic silicon monomer, and methyl acrylate, acrylic acid ester and an acrylic hydroxy ester monomer such as a seed emulsion polymerization method of the copolymer, silicone-modified acrylate copolymer emulsion was synthesized to examine the amount of organic silicon monomer emulsion mechanical stability, thermal stability, electrolyte stability and freeze-thaw stability, and also examine the mechanical properties of the emulsion film and the improvement of water absorption. Huang Yuewen N> O prepared containing solvent is soluble in gasoline silicon-methyl acrylate-modified acrylate copolymer, by water contact angle, the water absorption, the pencil hardness and <_AT_ MW spectroscopy and XPU and other tests to study the dissolution properties of the copolymer of acrylate monomer side chain alkyl impact and silicon-containing acrylate monomer and its copolymerization process results show that the delay after dropping the silicon-containing acrylate monomer, catalytic crosslinker Add hydroxy silicone oil blend copolymer surface hydrophobic properties and strength. enables isobutyl methacrylate and methyl acrylate, iso-bornyl acetate copolymer film surface hydrophobic properties and strength is greatly improved.
The emulsion polymerization method, and the seed emulsion fractionation step feeding mode, a certain percentage of the acrylate monomer and silicone macromer homemade undergo radical polymerization to obtain the silicone-modified acrylic resin emulsion. Single factor test and <= high level orthogonal experiment to optimize the optimal process parameters:! Dosage 450>, the amount of silicone prepolymer 2>, monomer ratio of 15?: Isopropanol an amount of 45 <>, obtain a high stability of emulsion, film-forming properties, and the performance improvement. Qiang 9?; Synthesized in a solution polymerization of the silicone-modified acrylic resin, to choose different types of silicon monomer test, impact on the film of water absorption of the silicon monomer, and different hard and soft acrylic monomer ratio coating flexibility and water absorption, and coating infrared analysis and scanning electron microscopy (SEM). The results show that the modified silicone acrylic resin coatings by graft reaction with excellent performance. Reflections on the Reform of 9 @; silicone modified acrylic emulsion as raw material, the use of silicone and acrylic emulsion polymerization has excellent performance, studied the impact of several factors on the performance of emulsion, in order to identify Preparation of silicone modified acrylic emulsion The optimum conditions.
        Organic Fluorine modified organic fluorine modified acrylic resin coating not only retains the acrylic resin paint good alkali resistance, gloss and color retention, coating fullness characteristics, but also has a the organic fluorine coating weatherability, stain resistance, corrosion-resistant and self-cleaning the advantage of a comprehensive performance coatings, has broad application prospects. Fluorine is the largest element of electrically negative, having the strongest electric negative, the lowest polarization, and the atomic radius than hydrogen only. Fluorine atom substituted on the key of the A-B, B, formation of the A-key is extremely short, and the key can be up =: 1 CD EF "7 perfluorinated groups in the fluorine-containing acrylate polymer is located in the side chain of the polymer , in the process of forming a film, perfluoroalkyl-rich product to the interface of the polymer and air, and to the air extending outwardly perfluoro side chains tend, can be formed on the main chain, as well as the internal molecular "shield protection. "Secondly, a fluorine atom radius larger than the radius of a hydrogen atom, but is smaller than the atomic radius of the other elements, so the main chain of carbon-carbon can be closely encase Therefore, a fluorine-modified acrylic resin having a strong chemical inertness, excellent waterproof, anti-fouling, oil repellency and good film-forming properties, flexibility and cohesiveness, etc., are widely used in construction, automotive, machinery and electronics, shipbuilding, aerospace and other high-tech fields.
Xuyun Li, etc. 92; studied the synthesis of fluorine and silicone-modified acrylic emulsion, by appropriate selection of the fluorine-containing silicone monomers and the polymerization process, the first synthesis Fluorosilicate prepolymerized body, and then an acrylic resin as a main chain, the fluorine and silicone prepolymer pick into acrylic resin, which developed a high weather resistance, high stain resistance, high color retention, low pollution, good value for money, the comprehensive performance emulsion, has a lot of market development space. Housing Jun Zhuo 941; by thermal decomposition initiator system, the acrylic resin is modified with an organic fluorine monomer, synthesized integrated performance of a fluorine-modified acrylic emulsion, and formulated into exterior paints, obtain a good anti- sewage self-cleaning properties.
        Cai Guoqiang, etc. 944; use versatate ester hydrolysis to enhance the shielding effect of the light resistance and adhesion of the coating, in the copolymer component introduced versatate glycidyl ester (4G ₄ H dimethyl-H 4 H heptyl carboxylic acid group glycidyl), improve the light resistance of the coating, the narrow relative to the molecular weight distribution can be obtained, and to increase the solubility of the resin in an organic solvent to reduce viscosity, increase the solids content of the coating, to increase the fullness of the film. Zhang Yan 940; chemical modifier with a fluorocarbon radical polymerization product of acrylate monomer from methyl methacrylate, butyl acrylate, ethyl methacrylate, and 0 different fluorine segment length modification, due to the introduction of a fluorine-containing group of the acrylic acid ester polymer structure is changed, to maintain the advantages of the acrylic resin, but also increase the weather resistance and stain resistance of the advantages derived from the fluorocarbon resin, which was prepared having a extremely low surface energy of the high hydrophobic fluorinated acrylic resin, studies show that Fluorocarbon-modified agent to be added can be significantly reduced the surface of the coating, increasing the coating contact angle, when added in an amount of 45 @> continue to increase the fluorocarbon the modifier amount docking tentacles have little effect.
    Epoxy modified
        The epoxy resin is widely used, with high strength, good adhesion characteristics, but the outdoor weather is poor. Introduced at both ends of the epoxy resin of the molecular chain with an epoxy-modified acrylic resin, an unsaturated double bond of the propenyl group, and then copolymerized with other monomers, the emulsion obtained, both having a high modulus, high strength of the epoxy resin, chemical resistance products and excellent corrosion resistance, but also has good gloss acrylic resin, fullness and weather resistance, and the price is cheaper, apply to special occasions decorative requirements, such as the plastic surface coating processes such as surface I processing, electroplating, bronzing, coating J needs. Epoxy although no unsaturated double bond, but contain an ether bond, ortho carbon atoms! HB relatively inert, free radicals may be formed under the action of the initiator, and the polymerization reaction with an unsaturated monomer is grafted, The final product was ungrafted epoxy resin, a mixture 943 to the graft polymerization of an epoxy resin and an acrylic copolymer;
 Huang domain 94 =; the use of methyl acrylate, dimethylaminoethyl methacrylate and epoxy composite modified acrylate coating adhesion improvement is very significant, epoxy-modified acrylic acid alone is used as an anticorrosive coating film-forming acrylate The resin has better salt spray resistance and corrosion resistance. The same technique as the one employed for the synthesis of the epoxy-modified acrylic resin, the use of more nuclear H shell hybrid structure, interpenetrating polymerization, microemulsion polymerization, etc.. Point order to provide a crosslinking reaction with epoxy resin, the polymerization process can be introduced into a hydroxyl group and an amide group, in order to improve the film-forming substance in water resistance and weather resistance, etc.. Chunyan 94 <; modified acrylate monomer with an epoxy resin graft copolymer by the reaction of aqueous acrylic resin, epoxy resin type, the amount, the feeding mode, the reaction temperature and the degree of neutralization and other factors its the impact of the performance. The results show that when the epoxy K == added early in the reaction, the amount of the monomer 9:; 2: <mass fraction =, reaction temperature is 441>, and 441:, modified resin having good film-forming properties and excellent physical and mechanical properties.
    Officer Sloan? 49 @ studied the acrylate the process of the photosensitive characteristics phenolic epoxy composite modified using triethylamine as a catalyst when the reaction temperature reaches 2A> acrylic monomer reaction 9. Completely modified resin after the film has excellent dynamic performance, solvent resistance and resistance to acid and alkali. Ma Pingdeng? 4B _AT_ double bond content of the content is considerably higher than the double bond in the maleic anhydride-modified epoxy acrylate resin prepared by conventional esterification methods, and the light-curing time was significantly shorter, to improve the epoxy acrylate resin the photocurable performance. Du Yucheng, etc.? 4C @ D41 epoxy modified acrylic resin as the base material the 8BA polyurethane curing agent EF additives <high ​​light hydrophobe =, coupling agent talc hydrophobic functional fillers, coupling agents to change sexual amorphous G) H0 roughness modifiers anatase nano-F) H0 photocatalyst prepared by the self-cleaning anti-corrosion coatings with good acid and alkali resistance.
 The contact angle of the surface of the coating up to 412I, having excellent hydrophobic character, the contamination rate of the coating can be reduced to 0: The following. Yi Xiang, etc.? 42 @ epoxy modified acrylic hydrophilic coating preparation and performance studies, aqueous solution polymerization synthesis of hydrophilic acrylic resin, discuss the hydrophilic monomer ratio, polymer JE coating hydrophilic and the water resistance of the studied crosslinking agent, a modified resin, emulsifying the comprehensive performance of the coating film, and theoretically analyzed, to determine the ratio of the respective components. The test results show that the hydrophilicity and the water resistance of the coating film to achieve a better balance, after modification improved the corrosion resistance and adhesion of the coating.
    Polyurethane modified
         Polyurethane coating with high mechanical abrasion resistance, plump bright, good chemical resistance, low temperature resistance, good flexibility and high bond strength, but waterborne polyurethane film weatherability, water resistance, mechanical strength is less than acrylic emulsion. Aqueous acrylate and polyurethane composite, able to overcome their disadvantages, the coating performance improved significantly? 01 @, and lower costs, with a wide range of application prospects. Polyurethane modified acrylic emulsion K the following kinds of ways? 04 @:! Physical blend of polyurethane emulsion and acrylic emulsion L synthesis with double bonds of unsaturated urethane monomers, acrylate copolymer L # with polyurethane emulsion for seed emulsion polymerization L $ first solvent-based urethane acrylate, and then the solvent was evaporated and emulsified composite emulsion.
         Preparation of. Etc.? 00 @ using isophorone diisocyanate <M'NM = prepared photocurable urethane acrylate prepolymer, the preparation conditions, select reactive diluent monomer to cure the coating, some of its physical performance test. The results showed that, compared with the commonly used 0, the KO toluene diisocyanate <the FNM. = Prepared photocurable urethane acrylate prepolymerized body, the prepolymer having a more excellent mechanical and anti-aging properties. Xiong Yuanqin etc.? 03 @ modified dendritic polyol synthesized novel dendrimers fast photocurable urethane acrylate, the test results show that the cured film has proper hardness and flexibility, good adhesion force. G (& *. "-? 0K @ synthesis of a new type of cross-linked polyurethane acrylate electrolyte <'PQ = the' PQ has good electrochemical stability and dimensional stability, with lithium and has a good compatibility, and therefore can be used for the lithium battery DR O! "77 (? 0A @ synthesis polyurethane S acrylate UV-curable adhesive excellent performance, and are widely used in printing and dyeing, inks, paints, etc.

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