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Polyester glass polymer, foam material and preparation method thereof

A foam material and polymer technology, which is applied in the fields of polyester glass polymer foam materials and polyester glass polymers, can solve the complex preparation of polyester vitrimers, the repeated processing performance of polyester polymers is reduced, and the Adverse effects of people and the environment, etc., to achieve the effect of unique self-healing properties, excellent thermal stability, and no performance degradation

Active Publication Date: 2022-07-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the decline of repeated processing performance of existing polyester polymers, excessive cross-linking cannot foam and the preparation of polyester Vitrimers is complicated, inefficient and the production process is harmful to people and In order to solve the problem of adverse effects caused by the environment, the present invention provides polyester glass polymers, polyester glass polymer foam materials, and their preparation methods, so as to effectively improve the repeated processing performance and creep resistance of polyester polymers. Modification and foaming properties, enrich the types of polyester polymer materials, expand their application fields, and at the same time realize the efficient preparation of polyester Vitrimers and increase the environmental protection of the preparation method

Method used

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  • Polyester glass polymer, foam material and preparation method thereof
  • Polyester glass polymer, foam material and preparation method thereof
  • Polyester glass polymer, foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the present embodiment, the steps of preparing polyester glass polymer are as follows:

[0038] 100 parts by mass of polyethylene terephthalate (PET) pellets, 2-bis(2-hydroxyethyl)amino-2-hydroxymethyl-1,3-propanediol (BIS-TRIS) 0-0.8 The mass parts were melt-blended in an internal mixer for 1-3 minutes, and then 3 mass parts of pyromellitic dianhydride (PMDA) were added and melt-blended for 3.5 minutes. The torque had stabilized, and the samples were taken out to obtain polyester glass polymers. The temperature of the three zones of the internal mixer is controlled to be 270 °C, and the rotor speed is 60 rpm.

[0039] In this example, according to the different addition ratios of BIS-TRIS, 4 samples were prepared in total. The sample was named 0.3BT, the sample prepared when the amount of BIS-TRIS was 0.5 parts by mass was named 0.5BT, and the sample prepared when the amount of BIS-TRIS was 0.8 parts by mass was named 0.8BT.

Embodiment 2

[0041] In this example, the swelling ability of each sample prepared in Example 1 in trifluoroacetic acid, a good solvent, and the relaxation ability of the sample 0.8BT were tested.

[0042] 1. Swelling ability test

[0043] Immerse 0.5g of each sample (OBT, 0.3BT, 0.5BT and 0.8BT) in 40mL of trifluoroacetic acid, and place it at room temperature for 48h to observe the swelling. photos such as figure 1 (a) shown in Fig. Depend on figure 1 Figure (a) shows that the sample OBT was completely dissolved after being soaked in trifluoroacetic acid for 2 hours, indicating that no cross-linked network structure was formed, while the sample 0.8BT was still not dissolved after being soaked in trifluoroacetic acid for 48 hours, indicating that the formation of Cross-linked network structure.

[0044] Further test the gel content (gel content) and swelling ratio (swellratio) of each sample after soaking for 48h, the results are as follows figure 1 (b) shown in Fig. Depend on figur...

Embodiment 3

[0049] In this example, the rheological properties of each sample prepared in Example 1 were tested.

[0050] 1. Small-angle oscillating plate shear experiment

[0051] Each sample (OBT, 0.3BT, 0.5BT and 0.8BT) was placed on a flat vulcanizer and pressed at 270°C and 10MPa for 3min to obtain a disc sample with a diameter of 25mm and a thickness of 0.8mm. The small-angle oscillating plate shear experiments were performed on each wafer sample on a DHR-3 rheometer, that is, the storage modulus and loss mode of each sample were observed under the conditions of 270 °C, 1% strain, and 0.1-500 rad / s. quantity, complex viscosity, and loss tangent as a function of frequency. To avoid sample degradation, this experiment was performed at N 2 under protection. The result is as figure 2 (a) to (c) of Fig.

[0052] Depend on figure 2 Figures (a) to (c) show that the storage modulus of the sample gradually increases with the increase of the amount of BIS-TRIS added, indicating that t...

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Abstract

The invention provides a polyester glass polymer which is formed by melting and blending polyester, a first additive and a second additive, the first additive is polyhydric alcohol containing a tertiary amine structure or polyhydric alcohol capable of forming the tertiary amine structure after reacting with the polyester, and the second additive is a compound containing an anhydride group; in the melt blending process, the first additive and the polyester form a dynamic cross-linked network structure through ester exchange reaction, and the second additive and a polyester molecular chain are subjected to branched cross-linking to form a cross-linked network structure; a tertiary amine structure in the first additive, excessive hydroxyl groups and ortho-groups of the second additive participate in an effect concerted catalysis transesterification reaction. The invention also provides a foam material of the polyester glass polymer. According to the invention, the repeated processing performance, creep resistance and foaming performance of the polyester polymer can be effectively improved, the variety of polyester polymer materials is enriched, and meanwhile, efficient and environment-friendly preparation of the polyester glass polymer is realized.

Description

technical field [0001] The invention belongs to the technical field of functional composite materials, and relates to a polyester glass polymer with excellent repetitive processing performance, creep resistance and foaming performance, a polyester glass polymer foam material, and a preparation method thereof. Background technique [0002] Polyester polymers are the thermoplastics with the highest output in the world after polyolefin polymers, among which the annual output of polyethylene terephthalate (PET) exceeds 700,000 tons. PET is mainly used in low-end industries such as bottle flakes, fibers and films. Due to the single low-end industrial structure, the PET market has suffered serious saturation. On the other hand, since polyester polymers are generally prone to pyrolysis, hydrolysis and shear degradation, the performance of recycled and reprocessed polyesters declines, which further affects the prospect of their recycling. At present, the method of chain extension a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/00C08K5/17C08K5/09C08J3/24C08G63/91C08J9/12
CPCC08J3/24C08G63/916C08J9/122C08G63/91C08J2367/02C08J2367/00C08K5/17C08K5/09C08J2203/06Y02W30/62
Inventor 龚鹏剑杨其李鹏支
Owner SICHUAN UNIV
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