通过溶胶-凝胶法在玻璃基板上制备了由回收的聚对苯二甲酸乙二醇酯(PET)制成的SiO2和回收的不饱和聚酯树脂(R-UPR)的混合涂层。首先,使用原硅酸四乙酯(TEOS)溶液通过溶胶-凝胶法合成SiO2。接下来,双(2-羟丙基-对苯二甲酸酯)(BHPT)是由消费后的PET瓶在丙二醇(PG)中的机械和化学回收(糖酵解)合成的,使用ZnA作为催化剂,在容器型反应器(20-200°C)中加入马来酸酐(MA),遵循相同的程序,合成了不饱和聚酯(UP),将其冷却至室温。接下来,加入苯乙烯(St)和过氧化苯甲酰(PBO)引发剂以获得R-UPR。合成了TEOS(T)和三种混合溶液,摩尔比为0:1:0(T),1:2:0.25(H1),1:1:0.25(H2),对于R-UPR:TEOS:3-三甲氧基-(甲硅烷基)-丙基-甲基丙烯酸酯(TMSPM),分别,哪个TC,使用浸渍技术对HCl,HC2和HC3涂层进行了阐述,并进行了聚合(120°C持续24小时)。通过FT-IR和TGA对溶液进行了表征,和涂层的SEM,纳米压痕,AFM,附着力,和接触角。结果表明,SiO2增强了R-UPR的机械性能(硬度和杨氏模量)和热性能。涂层完美地粘附在基材上,具有微米单位的厚度和平坦的表面;此外,亲水性随着SiO2的降低而降低。
Hybrid coatings of SiO2 and recycled unsaturated polyester resin (R-UPR) from recycled polyethylene-terephthalate (PET) were prepared by the sol-gel process on glass substrates. First, SiO2 was synthesized by the sol-gel process using a tetraethyl orthosilicate (TEOS) solution. Next, bis(2-hydroxypropyl-terephthalate) (BHPT) was synthesized from mechanical and chemical recycling (glycolysis) of post-consumer PET bottles in propylene glycol (PG) using ZnA as catalyst, in a Vessel-type reactor (20-200 °C); maleic anhydride (MA) was added and, following the same procedure, the unsaturated polyester (UP) was synthetized, which was cooled to room temperature. Next, styrene (St) and benzoyl-peroxide (PBO)-initiator were added to obtain R-UPR. TEOS (T) and three hybrid solutions were synthesized, with molar ratios of 0:1:0 (T), 1:2:0.25 (H1), 1:1:0.25 (H2), and 1:0:0.25 (H3) for R-UPR:TEOS:3-trimethoxy-(silyl)-propyl-methacrylate (TMSPM), respectively, with which TC, HC1, HC2, and HC3 coatings were elaborated using the immersion technique and polymerized (120 °C for 24 h). The solutions were characterized by FT-IR and TGA, and the coatings by SEM, nanoindentation, AFM, adhesion, and contact angle. The results showed that SiO2 enhanced mechanical (hardness and Young\'s modulus) and thermal properties of the R-UPR. The coatings adhered perfectly to the substrate, with thicknesses of micrometer units and a flat surface; in addition, hydrophilicity decreased as SiO2 decreased.