Optimization of Crosslinking Conditions for Unsaturated Polyester Preparation Using Styrene Free Crosslinking Agent
1. School of Chemical Engineering, Shijiazhuang University, Shijiazhuang Green Decorative Board Technology Innovation Center, Environmental Catalysis and Clean Technology Research and Innovation Center, Shijiazhuang 050035, China
2. Jindong Cable Limited Liability Company, Xingtai 054000, China
| Abstract: | The study on the preparation of a styrene-free unsaturated polyester using diallyl phthalate as a cross-linking agent, and the cross-linking reaction conditions for the preparation of unsaturated polyester through cross-linking and curing reaction of this cross-linking agent were studied. In this paper, the effects of the amount of initiator, curing temperature and curing time on the properties of unsaturated polyesters under two initiator systems, benzoyl peroxide (BPO) and tert-butyl peroxybenzoate (TBPB), were studied. Through research, it is found that under the two initiator systems, appropriately increasing the amount of initiator, increasing the curing temperature and prolonging the curing time are all beneficial to improve the tensile strength, flexural strength and thermal deformation temperature of unsaturated polyester, but unsaturated polyester The toughness of the ester is also deteriorated and the impact resistance is reduced. When the amount of initiator, curing temperature and curing time exceed a certain value, the change trend of these properties becomes slower. The initiation temperature required for the BPO initiated system is slightly lower than that of the TBPB initiated system. This study focuses on the preparation of a styrene-free unsaturated polyester using diallyl phthalate (DAP) as a cross-linking agent and systematically investigates the cross-linking reaction conditions. The effects of initiator type (benzoyl peroxide, BPO, and tert-butyl peroxybenzoate, TBPB), initiator content (1%–5%), curing temperature (100–140°C), and curing time (2–6 h) on the mechanical and thermal properties of the unsaturated polyester were evaluated. Experimental results indicate that increasing initiator content, curing temperature, and curing time within optimal ranges significantly enhances tensile strength, flexural strength, and heat deflection temperature (HDT). |
| Keywords: | Unsaturated Polyester; Styrene Free; Initiator; Curing Temperature; Curing Time |
| DOI: | 10.57237/j.mater.2025.01.002 |
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Received: 4 January 2025
Accepted: 9 April 2025
Published Online: 30 May 2025
Funding
| 1. | 2024年大学生创新创业训练计划项目 (S202410102073) |
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