Paint formulation: A Study on color changing paint for peelable wheel hub

Core tips: Liu Jia 1, Zhang Zhiliang 1, Ling Hui 1, 2, Zheng Yizhao 1, Zheng Lvfeng 1 (1 Guangdong Sanhe Chemical Technology Co., Ltd., Guangdong Zhongshan 528429; 2 Guangdong xinshanhe Development Co., Ltd., Guangdong Zhongshan 528429) 0 Preface In the Chinese automobile market, the appearance color of the traditional models is monotonous, while the automobile manufacturers mainly strive to improve the functionality and spaciousness of the automobile, which really involves the change of the appearance color of the automobile With the maturity of domestic automobile consumption culture, the personalized demand of car owners for body color is also increasing Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Home of coatings news: Liu Jia 1, Zhang Zhiliang 1, Ling Hui 1, 2, Zheng Yizhao 1, Zheng Lvfeng 1 (1 Guangdong Sanhe Chemical Technology Co., Ltd., Guangdong Zhongshan 528429; 2 Guangdong xinshanhe Development Co., Ltd., Guangdong Zhongshan 528429) In the Chinese automobile market, the appearance color of the traditional models is monotonous, while the automobile manufacturers mainly strive to improve the functionality and spaciousness of the automobile, which really involves the change of the appearance color of the automobile With the maturity of domestic automobile consumption culture, the personalized demand of car owners for body color is also increasing, which makes the peelable wheel hub color change paint develop rapidly The principle is to spray paint on the surface of the wheel hub After natural drying, a layer of polymer material film will be formed on the surface of the wheel hub, which can effectively protect the surface of the wheel hub from scratches and defects such as discoloration, pulverization and aging due to the natural environment such as sunlight, wind, frost, rain and snow At the same time, it can meet the personalized needs of the car owner for color and enrich the body color It can be removed by hand when there is no need for protection It is convenient to use and has ideal effect The peelable surface protective film rose in Japan in the early 1970s and developed further in the 1980s In addition, after more than 20 years of research and update, some countries in the United States and Europe have made rapid development in product performance, output, variety and other aspects For example, bernola OA published the application of rapid drying peelable membrane in nuclear technology in 1970 At present, the production of peelable protective coatings in our country is based on environmental protection, ensuring the research and development of products on human body and environment pollution-free, which has reached a certain level For example, the peelable protective coating prepared by Hu Naichang with SBS resin, talcum powder, phenolic resin and other additives is easy to peel out by hand, has good flexibility, extensibility, adhesion stability and peelability, can be used for temporary protection of metal curtain walls and other materials, and has been applied in some fields In this paper, SEBS thermoplastic elastomer as the main film-forming material, from different solvent types, SEBS content and material air ratio and other factors to study the performance of color change paint for peelable hub 1 See Table 1 for the source and specification of raw materials required for the test of test materials 1.2 test equipment disperser, sfj-400, Shanghai modern environmental engineering technology; rotational viscometer, ndj-85, Shanghai Changji geological instrument; shore rubber hardness tester, LX-A, Haibao instrument, Yueqing City, Zhejiang Province; tu-4 cup, Shenzhen Sanli; filling inflation equipment; electronic balance, es4100, accuracy 0.01 g, deant sensor 1.3 test method 1.3.1 basic formula design test basic formula preliminary design is shown in Table 2 1.3.2 for the preparation of liquid SEBS and color paste, take a certain amount of solid SEBS, add it to the corresponding solvent while dispersing, adjust the rotation speed of the dispersing machine to 1000 R / min, disperse for 5 min, and put it in a sealed place for more than 1 h until the system is transparent and without obvious particles, so as to obtain a liquid SEBS with a solid content of 25% Weigh a certain amount of liquid SEBS and dispersant d-851, add a certain amount of fluorescent powder while dispersing, adjust the rotation speed of the disperser to 1500 R / min, disperse for 30 min, place in a sealed place, and obtain a color paste with 20% color powder content, which is for standby 1.3.3 preparation of color change paint for peelable wheel hub: weigh a certain amount of prepared color paste, liquid SEBS, other trace additives, etc according to the formula in Table 2, add them into the solvent of corresponding system while stirring, adjust the speed of the disperser to 800 R / min, and disperse 15 The basic color paint is obtained in min after filtration, DME is filled according to a certain ratio of material and gas, and then it is potted and repacked to obtain the finished paint with fluorescent color which can peel off the wheel hub and change the color Results and discussion 2.1 SEBS is a new type of thermoplastic elastomer, which is called "the fourth generation rubber" in the scientific and technological circles SEBS is a linear triblock copolymer with polystyrene as terminal segment and ethylene butene copolymer obtained by hydrogenation of polybutadiene as intermediate elastic block After hydrogenation, the intermediate polybutadiene block of SBS is transformed into random copolymerization block of ethylene and 1-butene to become SEBS SEBS does not contain unsaturated double bond, so it has good stability and aging resistance Compared with SBS, SEBS's heat resistance is significantly improved The service temperature and processing temperature of SEBS are 130 ℃ and 290 ℃, respectively, while those of SBS are 65 ℃ and 200 ℃ It has good weatherability After 3000 hours of exposure test, the strength retention rate is 95% SEBS is resistant to inorganic acids, alcohols and other chemicals, has good solubility and blending, can be dissolved in common solvents, can be blended with many polymers, can be blended with other materials such as alkane oil or naphthenic oil commonly used in the rubber industry, and other polymers and fillers to produce special-purpose products In this study, with the same process conditions and calculation parameters, five kinds of detachable hub color changing paint with mass fraction of 8%, 10%, 15%, 18% and 20% of solid SEBS were prepared and sprayed on the iron plate By testing the viscosity of the coatings with different SEBS content and the peeling effect of the coatings, the appropriate SEBS mass fraction was determined The test results are shown in Table 3 It can be seen from table 3 that with the increase of SEBS mass fraction, the viscosity of the coating increases continuously, and too high viscosity has a great impact on the spray effect Therefore, it is necessary to prevent its viscosity from being too high, so the SEBS mass fraction should not be too high It can be seen from the peeling effect that when the mass fraction of SEBS is 15%, the whole sheet can be peeled, and the viscosity is 13 s, which also meets the spraying effect The test results show that when the mass fraction of SEBS is 15%, it can meet the design requirements 2.2 the influence of solvent type on peelable coating is to meet the construction process of peelable painting, which requires different solvents with different solubility and volatile characteristics to cooperate The use of a single solvent is not competent and must be applied with a mixed solvent to take care of the overall The mixed solvent is not as simple as the single solvent, it not only meets the solubility and volatility characteristics, but also has the problem of solvent balance In this experiment, dichloromethane, 6 × solvent oil, toluene, xylene and ethyl acetate were used to prepare 5 kinds of mixed solvents with different volatilization speed in different proportion, and then the peelable spray paint was respectively prepared and sprayed on the iron plate The suitable solvent type was determined by testing the properties of the peelable film The test results are shown in Table 4 It can be seen from table 4 that with the increase of the content of low volatile solvent, the pinhole condition of the coating film is significantly improved The solvent volatilizes too fast, the surface of the film dries quickly, and the gap in the film decreases, so that the solvent in the inner film cannot volatilize completely from the remaining gap, thus breaking through the film and forming pores or pinholes Increasing low volatile solvent and prolonging the surface dry time of the coating can improve the appearance of pinholes However, with the increase of low volatile solvent, the coating becomes soft, hard to peel off, and the surface dry time is too long When the mass fraction of low volatile solvent is 60%, it meets the design requirements 2.3 the effect of plasticizer content on the peelability of the film plasticizer is also called softener, which is a kind of low molecular weight compound that can reduce the force between rubber molecular chains, improve the processing performance, improve the physical and mechanical properties of rubber materials and reduce the cost Petroleum plasticizer is one of the most widely used plasticizers in rubber processing It has good plasticizing effect, abundant sources and low cost In this experiment, aromatic oil is selected as SEBS plasticizer Aromatic oil is also called aromatic hydrocarbon or aromatic hydrocarbon It refers to the hydrocarbon with benzene ring structure in the molecule It is one of the basic products and raw materials in petrochemical industry It has good rubber compatibility, high temperature resistance, low volatility and other characteristics, can significantly improve the processing performance of rubber, can enhance the weathering resistance, oxidation resistance, abrasion resistance, anti-aging degree of rubber products, and can help the mixing and dispersion of fillers in rubber materials, and is widely used in renewable rubber and a variety of rubber products and other industries In this experiment, the mass fraction of aromatic oil with plasticizer was 1%, 1.5% and 2% respectively Aromatics oil can help the mixture and dispersion of rubber materials, but at the same time, because of its high viscosity, the viscosity first decreases and then increases Its shore hardness decreases when the plasticizer content is 1.5%, but the basic change is small, as shown in Figure 1 Three groups of SEBS were made into peelable paint products respectively, and the peelability of the film was checked The test results showed that when the mass fraction of plasticizer was 1.5%, the peelability of the film was good and met the design requirements 2.4 effect of material air ratio on the spray state of the coating DME is a polar compound, but it has good compatibility with many polar and non-polar solvents, and can be compatible with most resins Five kinds of material air ratio were designed in the test The ideal material air ratio was determined by analyzing the spraying state of the coating under different material air ratio The results are shown in Table 5 Different material air ratio has a great influence on the spray state of paint, which indirectly affects the coating performance When the gas is less, the atomization effect is not good, and the liquid is easy to fly when it is ejected On the contrary, when more gas is injected, excessive atomization will affect the peeling effect of the film It can be seen from table 5 that when the selected material gas ratio is 5:3, the ejected state can meet the design requirements Conclusion (1) through the preliminary screening, the mass fraction of SEBS, low volatile solvent and plasticizer in the formulation is 15%, 60% and 1.5%, respectively When the ratio of material to gas is 5:3, the performance and effect of the color changing paint for the peelable hub meet the design requirements (2) SEBS is used as the main film-forming material to prepare the peelable hub color changing paint, and all the indexes meet the performance requirements of automotive paint (3) The research and development of color changing paint for peelable wheel hub has the characteristics of good peelability, weather resistance, water resistance, friction resistance, etc it can protect the wheel hub and meet the requirements of car owners for color personalization, and has a good market prospect 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,