Method for preparing crosslinked elastomer capable of being reprocessed by utilizing transamination

A cross-linked elastomer and reprocessing technology, which is applied in the field of functional materials, can solve problems such as insufficiency, and achieve the effects of environmental protection, simple and efficient modification methods, and mild reaction conditions

Active Publication Date: 2018-09-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the first two methods have realized the reuse of waste rubber to a certain extent, they are not sufficient

Method used

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  • Method for preparing crosslinked elastomer capable of being reprocessed by utilizing transamination
  • Method for preparing crosslinked elastomer capable of being reprocessed by utilizing transamination
  • Method for preparing crosslinked elastomer capable of being reprocessed by utilizing transamination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Taking PBAA-14% molar content of acetoacetyl group as an example, first dissolve 10g of butadiene rubber in 200mL of dichloromethane, add 2g of mercaptoethanol and 0.1g of initiator I907, and mix well. Then keep stirring and place under UV lamp (254nm, 100W) for 8h. After the reaction was completed, the ultraviolet lamp was removed, and then 3.3 g of diketene was added to the solution to continue the reaction for 1 h, and then reflux for 4 h. Finally, the solution was poured into 2L of absolute ethanol for precipitation, the precipitate was washed twice with absolute ethanol, and dried to constant weight. pass 1 HNMR characterizes and modifies the product quantitatively, and the important peak assignment results are as follows figure 1 shown. It can be seen from the calculation that 13.7 mol% of the double bonds in the butadiene rubber are modified into acetoacetyl groups, which is close to the feed ratio of 14 mol%, which shows the high efficiency of the modific...

Embodiment 2

[0043] (1) Obtain modified butadiene rubber PBAA-14% by the method of operation (1) in embodiment 1.

[0044] (2) Prepare the cross-linked film according to the method of operation (2) in Example 1, only need to replace 1,2-bis(2-aminoethoxy)ethane with ethylenediamine, and add with the same molar amount. According to the GB / T 528-2009 standard, the stress-strain curve is obtained as Figure 4As shown, the strain is 108%, the stress reaches 7.8MPa, and the toughness is 420MJ / m 3 .

[0045] (3) carry out reprocessing by the method of operation (3) among the embodiment 1.

[0046] (4) By the same test as in Example 1, the analysis results can draw the following conclusions: the reprocessed film is still a cross-linked network structure, has good solvent resistance, and has good reprocessing performance. After three times of reprocessing, the toughness is 320MJ / m 3 , reaching 76% of the original performance.

Embodiment 3

[0048] (1) Obtain modified butadiene rubber PBAA-14% by the method of operation (1) in embodiment 1.

[0049] (2) prepare the cross-linked film by the method of operation (2) in embodiment 1, only need to replace 1,2-bis(2-aminoethoxy)ethane with p-xylylenediamine, with the same molar amount join in. According to the GB / T 528-2009 standard, the stress-strain curve is obtained as Figure 4 As shown, the strain is 102%, the stress reaches 11.3MPa, and the toughness is 690MJ / m 3 .

[0050] (3) carry out reprocessing by the method of operation (3) among the embodiment 1.

[0051] (4) The reprocessed film is still a cross-linked network structure, has good solvent resistance, and has good reprocessing performance. After three times of reprocessing, the toughness is 550MJ / m 3 , reaching 79% of the original performance.

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Abstract

The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing a crosslinked elastomer capable of being reprocessed by utilizing transamination. A dynamic exchange reaction based on the transamination of the method makes the crosslinked elastomer have reprocessability; and the method comprises the following steps: firstly, through a thiol-ene ''click'' chemical modification method, a reaction of thiol and double bonds in an unsaturated elastomer is utilized to introduce hydroxyl; secondly, the introduced hydroxyl is further modified into acetoacetyl; and finally, a polyamine compound is added as a crosslinking agent to form a chemically-crosslinked network structure. According to the method disclosed by the invention, since an m-vinyl carbamate bond formed by a reaction of amino with the acetoacetyl can be subjected to transamination under certain conditions, the prepared crosslinked elastomer has reprocessability; and the method has very good practical value in the recovery and reuse process of elastomers.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing a reprocessable cross-linked elastomer by transamination. Background technique [0002] Polymer materials can be broadly classified into thermosetting and thermoplastic materials according to their thermal response behavior. Thermosetting materials have the advantages of dimensional stability, solvent resistance, and excellent mechanical properties. However, the non-reprocessability due to the existence of chemical cross-linking bonds makes the material unable to be recycled at the end of its service life, which not only reduces economic benefits, It also pollutes the environment. Although thermoplastic materials can be reprocessed, their mechanical properties often cannot meet higher requirements for use. [0003] Rubber (elastomer) generally needs to be vulcanized to meet the requirements of use, and its non-reprocessability lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L15/00C08C19/20C08C19/00
CPCC08C19/00C08C19/20C08J3/24C08J2315/00
Inventor 刘智勇史子兴
Owner SHANGHAI JIAO TONG UNIV
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