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A kind of epoxidized natural rubber composite material with self-healing function and preparation method thereof

A technology of natural rubber and composite materials, which is applied in the field of epoxidized natural rubber composite materials and its preparation, and can solve the problems of poor thermal stability and low strength of hydrogen bonds

Active Publication Date: 2022-04-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of low overall strength and poor thermal stability of hydrogen bonds developed based on traditional polymer materials in the prior art, the present invention provides a self-repairing epoxidized natural rubber compound The material and its preparation method, first synthesize 2-amino-4-hydroxy-6-methylpyrimidine (UPy) grafted polyurethane, and then react it with rubber molecular chains to prepare a composite material with self-healing function. good strength and stability

Method used

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  • A kind of epoxidized natural rubber composite material with self-healing function and preparation method thereof
  • A kind of epoxidized natural rubber composite material with self-healing function and preparation method thereof
  • A kind of epoxidized natural rubber composite material with self-healing function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Synthesis of polyurethane (PU) with carbon-carbon double bond introduced:

[0042] (1) Mix 0.1 mol of IPDI with 0.05 mol of PTMEG-1000, add 30 ml of DMAC as a solvent, and react under reflux at 80°C for 2 hours. .

[0043] (2) After the reaction is over, lower the reaction temperature to 60 o C, then add 0.0375mol 1,4-butenediol, a drop of dibutyl-tin dilaurate, 50ml DMAC, then heat up to 85 o C continues to react.

[0044] (3) After the reaction in step (2) is carried out for 1 hour, carry out the titration of the -NCO group, and titrate once every 20 minutes until the theoretical value of the reaction of the -NCO group is reached, and then add 0.025mol of PTMEG-1000, Continue to react for 3 hours until the end of the reaction.

[0045] (4) Use a rotary evaporator to remove DMAC from the product obtained in step (3) to obtain a polyurethane material with carbon-carbon double bonds;

[0046] (5) Repeat the above steps or enlarge the experimental scale to...

Embodiment 2

[0048] Embodiment 2: UPy grafted polyurethane (PU-UPy)

[0049] figure 2 It is a synthetic circuit diagram for preparing PU-UPy in the present invention, steps (1)-(3) are the same as in Example 1, and other steps are as follows:

[0050] (4) Add 0.0125mol of UPy and 300ml of DMAC to the reactant in step (3), then raise the temperature to 85 o C was stirred and refluxed for 12 hours, the reaction was completed, and the DMAC in the reaction product was removed using a rotary evaporator to obtain PU-UPy.

[0051] (5) Repeat the above steps or enlarge the experimental scale to prepare PU-UPy in large quantities. After casting the prepared PU-UPy into the mold, place it at 60 o C blast oven to remove the remaining solvent to obtain polyurethane sheet samples.

[0052] image 3 It is the state of the PU-UPy synthesized in this example in the polytetrafluoroethylene mold. Due to the introduction of carbon-carbon double bonds and UPy groups at the same time, it can be seen that ...

Embodiment 3

[0055] Embodiment 3: preparation epoxidized natural rubber

[0056] Weigh 100 parts of epoxidized natural rubber substrates with epoxidation degree of 25%, masticate for 5 minutes with a double-roller mill at room temperature, then add 1 part of vulcanizing agent dicumyl peroxide and 1 part of anti-aging agent in order. 1 part and 1 part of ultraviolet absorber, mixed and discharged evenly, and then placed in a flat vulcanizer, the vulcanization condition is: 135 o C, pressure 15MPa and molding time 5 minutes, obtain the epoxidized natural rubber sheet sample that does not mix polyurethane.

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Abstract

The invention provides an epoxidized natural rubber composite material with self-repair function and a preparation method thereof, belonging to the technical field of composite materials. The epoxidized natural rubber composite material described in the present invention contains 100 parts of epoxidized natural rubber matrix, 1-3 parts of dicumyl peroxide, 1-40 parts of polyurethane, 1-2 parts of anti-aging agent, and 0.5 parts of ultraviolet absorber. ‑1 part, the above-mentioned number of parts is the number of parts by mass. The invention synthesizes UPy grafted polyurethane first, and then reacts it with rubber molecular chains to prepare a composite material with self-repair function. The prepared composite material can realize self-repair under the condition of complete end fracture, and also has good The strength and stability are high, and the preparation method is simple and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to an epoxidized natural rubber composite material with self-repair function and a preparation method thereof. Background technique [0002] Rubber materials and polyurethane materials are traditional polymer materials widely used in daily life. In recent years, the research and application of reinforcing traditional polymers have gradually reached the bottleneck. With the rapid rise of artificial intelligence, the performance of polymer materials The requirements are not limited to the improvement of mechanical properties, but also the functional and intelligent performance of polymer materials. Most of today's frontier research on polymers is based on molecular design and synthesis to realize the functionalization of polymer materials, such as research on electronic skin and soft sensors, which consumes too many petrochemical products. Therefore, it is necess...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L15/00C08L75/14C08K5/14C08K5/18C08K5/132C08G18/75C08G18/67C08G18/66C08G18/48C08G18/32
CPCC08L15/00C08G18/755C08G18/675C08G18/4854C08G18/3293C08L2201/08C08L75/14C08K5/14C08K5/18C08K5/132
Inventor 刘荣娟聂仪晶周志平刘勇
Owner JIANGSU UNIV
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