Dependence of the air-drying exothermic effect on the double bond in alkyd resins

Wang, Yong; Zhang, Jinxiang; Zhao, Bo; Lu, Ying; Wang, Jie; Jiang, Xuepeng

doi:10.1007/s10973-021-11084-8

Cited by 1 publication

(1 citation statement)

References 19 publications

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“…36 The double-bond content (C) of silicone resin was determined by the iodometric method according to national standard GB/T 1676-2008. 37 The gel content (G) of UV-cured silicone resins was determined by a swelling method according to eq 3. The weight of cured silicone resins was recorded as m 1 , then soaked in toluene for 48 h, dried, and weighed (m 2 ).…”

Section: Preparation Of a Uv-cured Mtq Silicone Resin (Uvmtq-tq-t)mentioning

confidence: 99%

Free-Radical/Cationic Hybrid UV-Curable Silicone Resin for Age-Resistant Coatings

Huang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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To achieve the unique advantages of silicone resin and the free-radical/cationic hybrid UV-curing mechanism, a free-radical/cationic hybrid UV-curable silicone resin (MTQ-TQ-T) is synthesized from commercially available siloxanes, hexamethyldisiloxane (MM, M segment), phenyltrimethoxysilane (PTMS, T segment), γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560, T segment), (3-methacryloxy)propyltrimethoxysilane (KH570, T segment), and tetraethyl orthosilicate (TEOS, Q segment). UV-curing kinetics indicates that the polymerization efficiency of MTQ-TQ-T initiated by free-radical and cationic dual photoinitiators is better than that of a single photoinitiator. As the molar ratio of cationic to free-radical photoinitiators (C/R) increases, the double-bond conversion first increases and then decreases, but the epoxy group conversion is the opposite. The optimal C/R and dose of dual photoinitiators are 1.5 and 10 wt %, respectively. After UV-curing, the coating has excellent overall performance including a gel content of 87.8%, a Shore A hardness of 85, a tensile strength of 4.23 MPa, and an impact strength of 5.48 kJ/m2. Its thermal decomposition temperature of 5 wt % is 338 °C, and the yellowing index only increases by 0.98 after thermal aging at 85 °C for 72 h. Moreover, UVMTQ-TQ1-T0.33 (the molar ratio, T/Q of 1 and KH560/570 of 0.33) shows good hydrophobicity with a contact angle of 87°, and it is still 89° after thermal aging. In addition, the adhesion of coating increases with the increase of epoxy groups, where UVMTQ-TQ1-T1 (the molar ratio, T/Q of 1 and KH560/570 of 1) has optimal adhesion with a shear strength and 180° peel strength of 1.7 and 0.9 MPa, respectively. Therefore, this free-radical/cationic hybrid UV-curable silicone resin will be used as aging-resistant coatings.

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Section: Preparation Of a Uv-cured Mtq Silicone Resin (Uvmtq-tq-t)mentioning

confidence: 99%

Free-Radical/Cationic Hybrid UV-Curable Silicone Resin for Age-Resistant Coatings

Huang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

Dependence of the air-drying exothermic effect on the double bond in alkyd resins

Cited by 1 publication

References 19 publications

Free-Radical/Cationic Hybrid UV-Curable Silicone Resin for Age-Resistant Coatings

Free-Radical/Cationic Hybrid UV-Curable Silicone Resin for Age-Resistant Coatings

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