透明耐磨疏水有机硅改性丙烯酸树脂的制备及性能

目的 研究不同丙烯酸类单体以及硅烷偶联剂配比对所制得的树脂涂层自清洁性能与机械性能的影响。方法 以甲基丙烯酸甲酯（MMA）、甲基丙烯酸羟乙酯（HEMA）、丙烯酸丁酯（BA）3种丙烯酸类单体与硅烷偶联剂（KH570）为原材料，采用自由基聚合法制备了具有透明耐磨性质的疏水有机硅改性丙烯酸树脂，加入羟基硅油使其交联固化，增强机械性能。重点研究了树脂涂层的接触角、附着力、硬度、透光率及耐摩擦等性能。结果 有机硅单体成功与丙烯酸类单体发生共聚，单因素优化后的树脂涂层的接触角为106.7°，与基体结合力为0级，硬度为H，在可见光波段内，涂覆在玻璃基底上的树脂最高透光率为92.08%，同时涂层具有良好的致密性。结论 将硅烷偶联剂（KH570）与丙烯酸类单体进行共聚，硅烷偶联剂的长链明显提升了共聚物的疏水性与稳定性，经交联固化后涂层表现出良好的机械性能与稳定性，并且由于所加单体的折射率都<1.5，因而涂层表现出一定的增透效果。

Preparation and Properties of Transparent and Wear-resistant Hydrophobic Silicone Modified Acrylic Resin

With the rapid development of the photovoltaic industry, maintaining the optimal performance of such energy devices has become an important issue. In order to improve the self-cleaning and scratch resistance of photovoltaic solar panels in outdoor environments, this paper prepared silicone modified acrylic resins with transparent hydrophobic and wear-resistant properties by free radical polymerization using three acrylic monomers, including methyl methacrylate (MMA), hydroxyethyl methacrylate (HEMA), butyl acrylate (BA), and silane coupling agent (KH570) as raw materials. After that, hydroxyl silicone oil is added to cross-link and cure it to enhance the mechanical properties. Single-factor experiments were conducted to optimize the ratio of monomer and curing agent. We focused on the contact angle, adhesion, hardness, light transmittance and friction resistance of the copolymer coating after the optimization of process parameters. TENSOR27 was used to conduct Fourier infrared (FT-IR) test on the resulting copolymer to characterize the occurrence of copolymerization reaction by the change of functional groups, and the contact angle was measured by JC2000DF contact angle measuring instrument to characterize the hydrophobicity of the copolymer coating. The hardness and adhesion of the copolymer coating were measured qualitatively by QHQ-A pencil hardness tester test and Cross-Cut Tester respectively. The transmittance of the coating in the visible wavelength band was tested with a Lambda 750S UV-Vis NIR spectrophotometer. The friction resistance of the coating was characterized by measuring the change of contact angle after different friction times. Finally, the impedance of the coating film was measured with a CHI660D electrochemical workstation to obtain its dense properties. The results showed that the silicone monomer was successfully copolymerized with acrylic monomer, and the best process parameters obtained after single-factor experiments were:methyl methacrylate (MMA) 7.6 g, butyl acrylate (BA) 2.4 g, hydroxyethyl methacrylate (HEMA) 1.0 g, silane coupling agent (KH570) 1.0 g and 0.1 g of hydroxy silicone oil. The copolymer coating obtained after single-factor optimization has a contact angle of 106.7° and possesses good hydrophobicity. The bonding force between the coating and the substrate is 0 and the hardness is H, showing excellent mechanical properties. The highest light transmission rate of the resin coated on the glass substrate is 92.08% in the visible wavelength band, with certain transmission enhancement performance. Meanwhile, the coating has good abrasion resistance and denseness. Therefore, we can see that the copolymerization of silane coupling agent (KH570) and acrylic monomer makes the long chain in the silane coupling agent (KH570) obviously enhance the hydrophobicity and stability of the copolymer, and enhance the mechanical properties and stability of the coating after cross-linking and curing. Because the refractive index of each added monomer is <1.5, the coating exhibits certain permeability enhancement properties.