CN116925434A - One-step in-situ crosslinking heat reversible rubber and preparation method thereof - Google Patents

One-step in-situ crosslinking heat reversible rubber and preparation method thereof Download PDF

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CN116925434A
CN116925434A CN202310803930.XA CN202310803930A CN116925434A CN 116925434 A CN116925434 A CN 116925434A CN 202310803930 A CN202310803930 A CN 202310803930A CN 116925434 A CN116925434 A CN 116925434A
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rubber
free radical
thermoreversible
situ
compound
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王小萍
骆岐明
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/246—Intercrosslinking of at least two polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2307/00—Characterised by the use of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08J2309/02—Copolymers with acrylonitrile
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08J2309/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2415/00—Characterised by the use of rubber derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
    • C08J2463/02—Polyglycidyl ethers of bis-phenols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
    • C08J2463/04—Epoxynovolacs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
    • C08K5/3432—Six-membered rings
    • C08K5/3435—Piperidines

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses one-step in-situ crosslinking heat reversible rubber and a preparation method thereof. The method comprises the following steps: fully and uniformly mixing rubber, a monofunctional nitroxide free radical compound and a polyfunctional epoxy compound, and obtaining the in-situ crosslinked thermoreversible rubber through a hot-pressing process one-step method. The invention builds a dynamic covalent network in the rubber by utilizing the synchronization of the epoxy ring-opening reaction and the alkoxyamine reaction to obtain the in-situ crosslinked thermo-reversible rubber, and the dynamic covalent network is dissociated/associated to endow the rubber with the repeated processability. The thermal reversible rubber prepared by in-situ crosslinking through the one-step method has the advantages of simple process, excellent comprehensive performance and high repeated processing efficiency, and provides an environment-friendly strategy for the industrial application of novel rubber materials.

Description

One-step in-situ crosslinking heat reversible rubber and preparation method thereof
Technical Field
The invention relates to a preparation method of in-situ crosslinking thermal reversible rubber, in particular to a preparation method of in-situ crosslinking thermal reversible rubber by fully and uniformly mixing raw rubber, a monofunctional nitroxide free radical compound and a polyfunctional epoxy compound and performing a hot-pressing one-step method.
Background
The excellent physical and mechanical properties of the rubber material enable the rubber material to be applied to various fields, however, as the permanent covalent cross-linked network in the rubber does not have repairability, the waste rubber material is difficult to recycle in a repeated processing mode, so that the rubber resource is wasted, serious black pollution is caused, and the environment faces a great challenge. In addition, traditional rubber materials contain a large amount of toxic additives, and the treatment of waste rubber brings great challenges to the ecological environment. The existing rubber material recycling mode has the defects of low recycling efficiency, secondary pollution and the like. Therefore, the method for preparing the environmentally friendly reproducible processed rubber material has great social significance and economic value.
Along with the enhancement of environmental awareness, people deeply realize that the waste rubber has a huge threat to the environment, and the effective recycling of the waste rubber is not slow. In recent years, a thermal reversible rubber material based on dynamic covalent bonds has attracted a great deal of attention in the scientific community and the social aspect, and the novel thermal reversible material enables crosslinked rubber to be directly recycled. Currently, the common dynamic covalent system mainly comprises a Diels-Alder system, a disulfide exchange system, a boric acid ester exchange system, an alkoxyamine bond and the like. Wherein the alkoxyamine bond is a reversible covalent bond formed based on the capture of carbon radicals by nitroxide radicals, the property of the alkoxyamine bond to cleave into nitroxide radicals and carbon-centered radicals under high temperature conditions and to re-bond at low temperature is disclosed in the literature [ Ze Ping Zhang, min Zhi Rong, ming Qia Zhang. Room temperature self-healable epoxy elastomer with reversible alkoxyamines as crosslinkages [ J ] Polymer 2014,55,3936-3943 ]. Carbon-carbon double bonds in unsaturated rubber generate carbon free radicals at high temperature for alkoxyamine reaction with nitroxide free radicals, but the formation of alkoxyamine dynamic covalent network in unsaturated rubber must utilize polyfunctional nitroxide free radicals to react with carbon-carbon double bonds to form a thermally reversible three-dimensional crosslinked network. Under the prior art, two schemes for preparing polyfunctional nitroxide radical compounds for thermoreversible rubbers by monofunctional nitroxide radicals are available: firstly, a monofunctional nitroxide free radical compound is reacted with a filler to obtain a modified filler carrying polyfunctional nitroxide free radicals, and secondly, the monofunctional nitroxide free radical compound is chemically synthesized to obtain the polyfunctional nitroxide free radical crosslinking agent. And further introducing a polyfunctional nitroxide radical modified filler or a crosslinking agent into the rubber to prepare the thermoreversible rubber. Both the techniques for preparing the polyfunctional nitroxide free radical from the monofunctional nitroxide free radical need to pre-modify the monofunctional nitroxide free radical, and the pre-modification process has the problems of complex flow, need to use a large amount of organic solvents, environmental protection and the like. For the above reasons, the technology for preparing the thermoreversible rubber by using the monofunctional nitroxide free radical compound is not suitable for industrialized popularization and application, so that the preparation and application of the dynamic covalent crosslinking thermoreversible rubber of the alkoxyamine are greatly limited. The technology provided by the scheme utilizes the monofunctional nitroxide free radical compound to introduce the dynamic alkoxy amine bond into the rubber through one-step in-situ crosslinking, so that the thermal reversible rubber with excellent mechanical properties and repeated processability is prepared, and the technology has the advantages of no need of presynthesis, use of a large amount of organic solvents and the like, and has excellent industrial application potential and value.
The in-situ crosslinking mechanism of the thermoreversible rubber is the combined action of an alkoxyamine reaction and an epoxy ring-opening reaction. While the monofunctional nitroxide radical reacts with double bonds on the molecular chain of the rubber, the active functional group (hydroxyl, carboxyl, amino) and the like at the other end attack the epoxy group on the multifunctional epoxy compound to open the ring, thereby realizing the crosslinking of the rubber. In view of the reversible nature of the alkoxyamine bond, the alkoxyamine crosslinking structure in the rubber can be cracked into a nitroxide free radical and a carbon center free radical at high temperature, and can be rebuckled into an alkoxyamine crosslinking structure at low temperature, so that the rubber material is endowed with the reworkability, and the recycling of the rubber material can be realized.
Disclosure of Invention
The invention aims to provide a preparation method of in-situ crosslinked thermoreversible rubber. The in-situ crosslinking method by utilizing an alkoxyamine reaction and an epoxy ring-opening reaction introduces a thermally reversible crosslinking structure into the rubber, so that the rubber has the repeatability and the processability. The invention has simple operation process, does not need chemical solvents and organic synthesis, and is an environment-friendly processing method.
The object of the invention is achieved by at least one of the following technical solutions.
The preparation method of the in-situ crosslinked thermoreversible rubber comprises the following steps:
(1) Fully and uniformly mixing rubber, a monofunctional nitroxide free radical compound and a polyfunctional epoxy compound to obtain a rubber compound;
(2) The rubber compound is subjected to a one-step method of a hot pressing process to obtain the in-situ crosslinked thermoreversible rubber.
Further, in the step (1), the monofunctional nitroxide radical compound is a single nitroxide radical compound having a hydroxyl group, a carboxyl group, an amine group or other active groups at one end, and the polyfunctional epoxy compound is a substance having two or more epoxy groups.
Further, in the step (1), the raw materials are as follows in parts by weight: 100 parts of rubber, 1-20 parts of monofunctional nitroxide free radical compound and 1-30 parts of polyfunctional epoxy compound.
Further, in the step (2), the hot press crosslinking temperature is 120-190 ℃, and the time of the hot press crosslinking is 5-60min.
Further, in the step (1), the monofunctional nitroxide compound is 4-carboxy-2, 6-tetramethylpiperidine oxide, 4-hydroxy-2, 6-tetramethylpiperidine-1-oxyl, 4-amino-2, 6-tetramethylpiperidine oxide, more than one of single nitroxide free radical compounds such as 5-nitroxide free radical stearic acid, 7-nitroxide free radical stearic acid, 3-carboxyl-2, 5-tetramethyl pyrrolidine-1-oxyl free radical, 12-nitroxide free radical stearic acid, etc.
Further, in the step (1), the rubber is a rubber containing unsaturated carbon-carbon double bonds, and comprises more than one of butadiene rubber, natural rubber, styrene-butadiene rubber, nitrile rubber, butyl rubber, isoprene rubber, ethylene propylene diene monomer rubber and chloroprene rubber
Further, in the step (1), the polyfunctional epoxy compound includes one or more of bisphenol a type epoxy resin, bisphenol F type epoxy resin, phenolic type epoxy resin, methacrylic epoxy resin, epoxidized soybean oil, diglycidyl ether, and epoxidized natural rubber.
Further, in the step (1), a filler is added in the mixing process; the filler is one or more of carbon black, white carbon black, calcium carbonate, graphene, silicate, talcum powder, metal oxide and carbon nano tube.
The principle of the invention is as follows: the thermo-reversible alkoxyamine crosslinking structure is introduced into the rubber through an in-situ reaction of a one-step method. Specifically, a nitrogen-oxygen free radical at one end of a monofunctional nitrogen-oxygen free radical compound reacts with a carbon-carbon double bond of a rubber molecular chain to generate an alkoxy amine bond, and simultaneously, an active group at the other end of the monofunctional nitrogen-oxygen free radical compound and an epoxy group in a polyfunctional epoxy compound undergo a ring-opening reaction to form an in-situ crosslinking network structure. The alkoxyamine structure in the material is cracked at high temperature to form a nitroxide free radical and a carbon center free radical, and the nitroxide free radical and the carbon center free radical can be rapidly combined to form an alkoxyamine structure at low temperature, so that the rubber material is endowed with thermal reversibility.
Compared with the prior art, the invention has the following excellent effects:
the rubber material prepared by the invention has excellent mechanical properties. In the prior art, the preparation of the thermoreversible rubber by utilizing the monofunctional nitroxide free radical requires that the filler is firstly pre-modified or a polyfunctional nitroxide free radical crosslinking agent is synthesized, and then the modified filler or the crosslinking agent is introduced into the rubber to obtain a dynamic crosslinking network. The preparation of the heat reversible rubber does not need complex pre-modification and organic synthesis, and the heat reversible rubber material with repeatable processability can be obtained by simply mechanically blending raw materials and performing in-situ crosslinking through a one-step method. In addition, the preparation of the thermoreversible rubber can realize in-situ crosslinking of rubber on the traditional rubber processing equipment, has the advantages of simple process, suitability for the requirements of industrial application, no need of pre-modification or pre-synthesis of crosslinking agents, avoidance of use of harmful vulcanization compounding agents and the like, and provides an effective way for the industrial application and green recovery of novel green rubber materials.
Drawings
Fig. 1 is an electron paramagnetic resonance spectrum of example 2 of the present invention.
Detailed Description
The invention will be further elaborated in connection with the drawings and the specific embodiments described below, which are intended to illustrate the invention only and are not intended to limit the scope of the invention. The test methods used in the following examples are conventional methods unless otherwise specified; the materials, reagents and the like used, unless otherwise specified, are those commercially available.
Comparative example
100 parts of natural rubber, 10 parts of epoxidized natural rubber, 5 parts of zinc oxide, 1 part of stearic acid, 0.5 part of accelerator M, 1.5 parts of accelerator CZ and 50 parts of carbon black are fully and uniformly mixed, and hot-pressed for 10min at 150 ℃ to obtain sulfur-vulcanized natural rubber serving as a comparative example.
Example 1
100 parts of natural rubber, 15 parts of 4-carboxyl-2, 6-tetramethylpiperidine oxide, 10 parts of epoxidized natural rubber and 50 parts of carbon black are fully and uniformly mixed, and hot-pressed for 30min at 140 ℃ to obtain the one-step in-situ crosslinked thermoreversible rubber.
Repeating processing of the thermoreversible rubber: crushing the thermoreversible rubber, re-mixing to obtain slices, and then placing the slices on a flat vulcanizing machine for hot pressing for 10min at 130 ℃ to obtain the thermoreversible rubber again.
Table 1 shows the actual resultsDynamic mechanical property data for example 1 and comparative example, wherein Tg 1 And Tg of 2 Glass transition temperatures of natural rubber and epoxidized natural rubber, respectively. EXAMPLE 1 Tg of thermoreversible rubber 1 And Tg of 2 Respectively-47.5 ℃ and 9.3 ℃ and Tg in the comparative example 1 And Tg of 2 The delta Tg of the thermoreversible rubber was 56.8℃and significantly lower than the 68.2℃delta Tg of the comparative example, at-46.3℃and 21.9℃respectively. The construction of the dynamic covalent network is shown to obviously improve the compatibility of two phases of natural rubber and epoxidized natural rubber in a thermoreversible system.
The tensile test shows that the thermal reversible rubber of the example 1 has good mechanical property and repeated processing property. (as shown in Table 2).
Example 2
100 parts of nitrile rubber, 1 part of 4-amino-2, 6-tetramethylpiperidine oxide, 1 part of phenolic epoxy resin F44 and 5 parts of graphene are fully and uniformly mixed, and hot-pressed for 10min at 170 ℃ to obtain the one-step in-situ crosslinked thermoreversible rubber.
In order to analyze the dynamic reversible property of the thermoreversible rubber obtained in example 2, electron paramagnetic resonance test was performed on the material at 30℃and 160℃in three repeated temperature rise and drop, and the result is shown in FIG. 1. At 30 ℃, the alkoxyamine bond exists in a stable covalent bond form, and the concentration of the nitroxide free radical is low; when the temperature is raised to 160 ℃, the concentration of nitroxide radicals increases significantly, because the alkoxyamine bond is unstable in a high temperature environment, dissociating into nitroxide radicals and carbon radicals. As the temperature decreases to ambient, the concentration of nitroxide radicals returns to the original state, indicating that nitroxide radicals and labile carbon radicals are re-bonded to alkoxyamine bonds. In three temperature cycles, the concentration of the nitroxide free radical is kept high at high temperature, and the concentration of the nitroxide free radical is restored to the initial state at low temperature, which indicates that the alkoxyamine bond realizes multiple dissociation/association under the temperature cycle condition, and has good dynamic reversibility.
Repeating processing of the thermoreversible rubber: the thermoreversible rubber was re-compounded into pieces, which were then placed on a press vulcanizer and hot-pressed at 160℃for 15 minutes, again obtaining the thermoreversible rubber.
The tensile test experiment shows that the thermal reversible rubber of the embodiment 2 has good mechanical property and repeated processing property. (as shown in Table 2).
Example 3
100 parts of natural rubber, 5 parts of 5-nitroxide free radical stearic acid and 5 parts of epoxidized soybean oil are fully and uniformly mixed, and hot-pressed for 60min at 120 ℃ to obtain the one-step in-situ crosslinked thermo-reversible rubber.
Repeating processing of the thermoreversible rubber: the thermoreversible rubber was crushed and re-mixed to obtain a sheet, which was then placed on a press vulcanizer and hot-pressed at 120℃for 20 minutes, to obtain the thermoreversible rubber again.
The tensile test experiment shows that the thermal reversible rubber of the embodiment 3 has good mechanical property and repeated processing property. (as shown in Table 2).
Example 4
100 parts of styrene-butadiene rubber, 10 parts of 4-hydroxy-2, 6-tetramethylpiperidine-1-oxygen free, 15 parts of bisphenol A type epoxy resin E51 and 8 parts of organic montmorillonite are fully and uniformly mixed, and hot-pressed for 20min at 150 ℃ to obtain the one-step in-situ crosslinked thermoreversible rubber.
Repeating processing of the thermoreversible rubber: the thermoreversible rubber was crushed and re-mixed to obtain a sheet, which was then placed on a press vulcanizer and hot-pressed at 140℃for 10 minutes, to obtain the thermoreversible rubber again.
The tensile test experiment shows that the thermal reversible rubber of the embodiment 4 has good mechanical property and repeated processing property. (as shown in Table 2).
Example 5
100 parts of ethylene propylene diene monomer, 10 parts of 4-hydroxy-2, 6-tetramethylpiperidine-1-oxygen free radical, 10 parts of 4-amino-2, 6-tetramethylpiperidine oxide, 30 parts of bisphenol A type epoxy resin E44 and 60 parts of calcium carbonate are fully and uniformly mixed, and hot-pressed for 5min at 190 ℃ to obtain the one-step in-situ crosslinked thermo-reversible rubber.
Repeating processing of the thermoreversible rubber: the thermoreversible rubber was re-compounded into pieces, which were then placed on a press vulcanizer and hot-pressed at 170℃for 15 minutes, again obtaining the thermoreversible rubber.
The tensile test experiment shows that the thermal reversible rubber of the embodiment 5 has good mechanical property and repeated processing property. (as shown in Table 2).
Example 6
70 parts of isoprene rubber, 30 parts of butadiene rubber, 8 parts of 4-hydroxy-2, 6-tetramethyl piperidine-1-oxygen free radical, 10 parts of bisphenol F type cyclodiglycidyl ether 170, 10 parts of ethylene glycol diglycidyl ether and 40 parts of white carbon black are fully and uniformly mixed, and hot-pressed for 40min at 130 ℃ to obtain the one-step in-situ cross-linked thermo-reversible rubber.
Repeating processing of the thermoreversible rubber: and (3) re-mixing the thermoreversible rubber into pieces, and then placing the pieces on a flat vulcanizing machine to carry out hot pressing for 15min at 130 ℃ to obtain the thermoreversible rubber again.
The tensile test experiment shows that the thermal reversible rubber of the embodiment 6 has good mechanical property and repeated processing property. (as shown in Table 2).
Table 1 dynamic mechanical property data for comparative example and example 1
Sample preparation Tg 1 /℃ Tg 2 /℃ ΔTg/℃
Comparative example -46.3℃ 21.9 68.2
Example 1 -47.5℃ 9.3 56.8
TABLE 2 data sheet for related mechanical properties of thermoreversible rubber

Claims (10)

1. The preparation method of the one-step in-situ crosslinking thermoreversible rubber is characterized by comprising the following steps of:
(1) Fully and uniformly mixing rubber, a monofunctional nitroxide free radical compound and a polyfunctional epoxy compound to obtain a rubber compound;
(2) The rubber compound is subjected to a one-step method of a hot pressing process to obtain the in-situ crosslinked thermoreversible rubber.
2. The method for preparing the one-step in-situ crosslinking heat reversible rubber according to claim 1, wherein in the step (1), the monofunctional nitroxide free radical compound is a single nitroxide free radical compound containing a hydroxyl group, a carboxyl group or an amino group at one end and the polyfunctional epoxy compound is a substance containing two or more epoxy groups.
3. The preparation method of the one-step in-situ crosslinking thermoreversible rubber according to claim 1, wherein in the step (1), the raw materials are as follows in parts by mass: 100 parts of rubber, 1-20 parts of monofunctional nitroxide free radical compound and 1-30 parts of polyfunctional epoxy compound.
4. The method for preparing the in-situ cross-linked heat reversible rubber according to claim 1, wherein in the step (2), the hot press cross-linking temperature is 120-190 ℃, and the heat cross-linking time is 5-60min.
5. The method for preparing the one-step in-situ crosslinking thermal reversible rubber according to claim 1, wherein in the step (1), the monofunctional nitroxide free radical compound is 4-carboxyl-2, 6-tetramethylpiperidine oxide, 4-hydroxy-2, 6-tetramethylpiperidine-1-oxyl free radical, more than one of single nitroxide free radical compounds such as 4-amino-2, 6-tetramethyl piperidine oxide, 5-nitroxide free radical stearic acid, 7-nitroxide free radical stearic acid, 3-carboxyl-2, 5-tetramethyl pyrrolidine-1-oxyl free radical, 12-nitroxide free radical stearic acid and the like.
6. The method for preparing the in-situ crosslinking thermoreversible rubber according to claim 1, wherein in the step (1), the rubber is rubber containing unsaturated carbon-carbon double bonds and comprises more than one of butadiene rubber, natural rubber, styrene-butadiene rubber, nitrile rubber, butyl rubber, isoprene rubber, ethylene propylene diene monomer rubber and chloroprene rubber.
7. The method for preparing the one-step in-situ crosslinking thermoreversible rubber according to claim 1, wherein in the step (1), the polyfunctional epoxy compound comprises more than one of bisphenol a type epoxy resin, bisphenol F type epoxy resin, phenolic type epoxy resin, methacrylic acid epoxy resin, epoxidized soybean oil, diglycidyl ether and epoxidized natural rubber.
8. The method for preparing the one-step in-situ crosslinking thermoreversible rubber according to claim 1, wherein in step (1), filler is added in the mixing process; the filler is one or more of carbon black, white carbon black, calcium carbonate, graphene, silicate, talcum powder, metal oxide and carbon nano tube.
9. An in-situ crosslinking thermoreversible rubber prepared by the preparation method of any one of claims 1 to 8.
10. The in-situ crosslinked thermoreversible rubber according to claim 9, characterized in that it has excellent mechanical properties and repeated processability.
CN202310803930.XA 2023-06-30 2023-06-30 One-step in-situ crosslinking heat reversible rubber and preparation method thereof Pending CN116925434A (en)

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