CN113637245A - Lignin modified styrene butadiene rubber thermoplastic elastomer and preparation method thereof - Google Patents
Lignin modified styrene butadiene rubber thermoplastic elastomer and preparation method thereof Download PDFInfo
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Abstract
The invention provides a lignin modified styrene butadiene rubber thermoplastic elastomer which comprises the following components in parts by weight: 40-70 parts of lignin cross-linking agent modified styrene-butadiene rubber, 10-30 parts of high-density polyethylene, 20-25 parts of filler, 2-10 parts of plasticizer, 0.6-1.0 part of sulfur, 0.8-1.5 parts of accelerator M, 1.0-1.5 parts of accelerator DM, 2-5 parts of zinc oxide and 0.5-1 part of low molecular wax, wherein the lignin cross-linking agent modified styrene-butadiene rubber consists of lignin cross-linking agent and styrene-butadiene rubber, and the lignin cross-linking agent consists of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy and isocyanated guaiacyl lignin, and the lignin cross-linking agent has the beneficial effects that: the nitrogen oxide of the lignin crosslinking agent reacts with the carbon-carbon double bond of the styrene butadiene rubber to form a heat reversible alkoxyamine structure, and the lignin in the lignin crosslinking agent modified styrene butadiene rubber is rich in phenolic hydroxyl, so that the oxidation resistance of the styrene butadiene rubber thermoplastic elastomer is improved.
Description
Technical Field
The invention relates to the technical field of thermoplastic elastomers, in particular to a lignin-modified styrene butadiene rubber thermoplastic elastomer and a preparation method thereof.
Background
The thermoplastic elastomer is a kind of elastomer which has rubber elasticity at normal temperature and can be plasticized at high temperature, and two main methods for manufacturing and processing the thermoplastic elastomer are extrusion molding and injection molding, and the molding is rarely used. The processing of thermoplastic elastomers by injection molding is fast and economical. The thermoplastic elastomer has the physical and mechanical properties of vulcanized rubber and the processing property of soft plastics, and can be easily prepared into a final product by using a simple plastic processing machine without hot vulcanization like rubber, so that the thermoplastic elastomer is another material and process technical revolution in the rubber industry.
The styrene butadiene rubber thermoplastic elastomer has the characteristics of plastic and rubber, has high elasticity of rubber, high strength and easy processability of plastic, has good low temperature resistance, air permeability and wet skid resistance, is easy to process and form, has simple processing process, does not need vulcanization, has low energy consumption and easy coloring, and can recycle leftover materials. Due to unique physical and mechanical properties and continuous expansion of application fields, the material becomes a increasingly popular material in various related industries.
Chinese patent publication No. CN102417637A discloses a dynamically vulcanized styrene-butadiene rubber type thermoplastic elastomer and a preparation method thereof, wherein the raw material formula mainly comprises 10-50 parts by weight of styrene-butadiene rubber, 5-25 parts by weight of ethylene propylene diene monomer, 10-30 parts by weight of polypropylene, 30-60 parts by weight of rubber oil, 10-20 parts by weight of filler and a certain weight fraction of auxiliary agent. The raw materials are sent into a double-screw extruder to carry out dynamic vulcanization reaction to prepare the thermoplastic elastomer, and the thermoplastic elastomer has the characteristics of super softness, high strength and no oil seepage, but has poor oxidation resistance.
Disclosure of Invention
The invention provides a lignin modified styrene butadiene rubber thermoplastic elastomer which is characterized by comprising the following components in parts by weight: 40-70 parts of lignin cross-linking agent modified styrene-butadiene rubber, 10-30 parts of high-density polyethylene, 20-25 parts of filler, 2-10 parts of plasticizer, 0.6-1.0 part of sulfur, 0.8-1.5 parts of accelerator M, 1.0-1.5 parts of accelerator DM, 2-5 parts of zinc oxide and 0.5-1 part of low molecular wax, wherein the lignin cross-linking agent modified styrene-butadiene rubber consists of lignin cross-linking agent and styrene-butadiene rubber, and the lignin cross-linking agent consists of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy and isocyanated guaiacyl lignin.
Preferably, the filler is montmorillonite and the plasticizer is white oil.
A preparation method of a lignin-modified styrene-butadiene rubber thermoplastic elastomer is characterized by comprising the following steps:
(1) adding guaiacyl lignin and 4,4' -diphenylmethane diisocyanate into a toluene solvent, carrying out ultrasonic treatment, heating and stirring for reaction to obtain isocyanated guaiacyl lignin;
(2) adding isocyanated guaiacyl lignin and 4-hydroxy-2, 2,6, 6-tetramethyl piperidinyloxy into 100ml of dimethylformamide solvent, heating and stirring, carrying out nucleophilic addition reaction, and after the reaction is finished, filtering, washing and drying in vacuum to obtain a lignin cross-linking agent;
(3) weighing the lignin crosslinking agent and styrene butadiene rubber, uniformly mixing, and stirring for reaction at the stirring speed of 300 revolutions per minute to obtain lignin crosslinking agent modified styrene butadiene rubber;
(4) weighing lignin cross-linking agent modified styrene butadiene rubber, high-density polyethylene, a filler, a plasticizer, sulfur, an accelerator DM, zinc oxide and low molecular wax which are weighed according to the weight components, blending the materials together, adding the mixture into a double-screw extruder for reaction and extrusion, granulating, and then injecting the mixture through an injection molding machine to prepare the lignin modified styrene butadiene rubber thermoplastic elastomer.
Preferably, the mass ratio of the isocyanated guaiacyl lignin to the 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy in the step (2) is 10: 20, the reaction temperature is 50-70 ℃, and the reaction time is 10-16 h.
Preferably, the mass ratio of the lignin crosslinking agent to the styrene butadiene rubber in the step (3) is 30: 25, the reaction temperature is 120-140 ℃, and the reaction time is 6-8 h.
Preferably, the reaction temperature in the step (4) is 160-175 ℃, and the screw rotating speed is 30-50 r/min.
The reaction mechanism and the beneficial effects of the invention are as follows:
(1) a lignin-modified thermoplastic styrene-butadiene rubber elastomer is prepared through isocyanating guaiacyl lignin, nucleophilic addition reaction between isocyanated guaiacyl lignin and 4-hydroxy-2, 2,6, 6-tetramethyl piperidinyloxy to obtain lignin cross-linking agent, reaction between lignin cross-linking agent and styrene-butadiene rubber to obtain lignin cross-linking agent modified styrene-butadiene rubber, mixing it with auxiliary material, extruding out, granulating and injection moulding.
(2) Unsaturated carbon-carbon double bonds in the butadiene styrene rubber thermoplastic elastomer enable the butadiene styrene rubber thermoplastic elastomer to be easy to thermally oxidize and age by ultraviolet oxidation, nitrogen oxides in a lignin crosslinking agent react with the carbon-carbon double bonds of the butadiene styrene rubber to form a heat reversible alkoxy amine structure, the rubber is crosslinked through the alkoxy amine, lignin in the lignin crosslinking agent modified butadiene styrene rubber is rich in phenolic hydroxyl, and the oxidation resistance of the butadiene styrene rubber thermoplastic elastomer is improved.
Detailed Description
The invention is further illustrated by the following examples, which are intended to illustrate, but not to limit the invention further. The technical means used in the following examples are conventional means well known to those skilled in the art, and all raw materials are general-purpose materials.
Example 1
A preparation method of a lignin-modified styrene-butadiene rubber thermoplastic elastomer comprises the following steps:
(1) adding guaiacyl lignin and 4,4' -diphenylmethane diisocyanate into a toluene solvent, carrying out ultrasonic treatment, heating and stirring for reaction to obtain isocyanated guaiacyl lignin;
(2) adding 10g of isocyanated guaiacyl lignin and 20g of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy into 100ml of dimethylformamide solvent, heating and stirring for nucleophilic addition reaction at 50 ℃ for 10h, and after the reaction is finished, filtering, washing and vacuum drying to obtain a lignin cross-linking agent;
(3) weighing 30g of lignin crosslinking agent and 25g of styrene butadiene rubber, uniformly mixing, stirring and reacting at the temperature of 120 ℃, the reaction time of 6 hours and the stirring speed of 300 revolutions per minute to obtain lignin crosslinking agent modified styrene butadiene rubber;
(4) weighing 40g of lignin crosslinking agent modified styrene butadiene rubber, 10g of high density polyethylene, 20g of filler montmorillonite, 2g of plasticizer white oil, 0.6g of sulfur, 0.8g of accelerant, 1.0g of accelerant DM, 2g of zinc oxide and 0.5g of low molecular wax, blending, adding into a double screw extruder, reacting and extruding, wherein the reaction temperature is 160 ℃, the rotating speed of a screw is 30 revolutions per minute, granulating, and then injecting through an injection molding machine to prepare the lignin modified styrene butadiene rubber thermoplastic elastomer.
Example 2
A preparation method of a lignin-modified styrene-butadiene rubber thermoplastic elastomer comprises the following steps:
(1) adding guaiacyl lignin and 4,4' -diphenylmethane diisocyanate into a toluene solvent, carrying out ultrasonic treatment, heating and stirring for reaction to obtain isocyanated guaiacyl lignin;
(2) adding 10g of isocyanated guaiacyl lignin and 20g of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy into 100ml of dimethylformamide solvent, heating and stirring for nucleophilic addition reaction at 55 ℃ for 11h, and after the reaction is finished, filtering, washing and drying in vacuum to obtain a lignin cross-linking agent;
(3) weighing 30g of lignin crosslinking agent and 25g of butadiene styrene rubber, uniformly mixing, stirring and reacting at 125 ℃ for 6.5h at a stirring speed of 300 r/min to obtain lignin crosslinking agent modified butadiene styrene rubber;
(4) weighing 45g of lignin crosslinking agent modified styrene butadiene rubber, 15g of high density polyethylene, 21g of filler montmorillonite, 3g of plasticizer white oil, 0.7g of sulfur, 0.9g of accelerator, 1.1g of accelerator DM, 3g of zinc oxide and 0.6g of low molecular wax, blending, adding the mixture into a double-screw extruder, reacting and extruding, wherein the reaction temperature is 165 ℃, the rotating speed of a screw is 35 revolutions per minute, granulating, and injecting by an injection molding machine to prepare the lignin modified styrene butadiene rubber thermoplastic elastomer.
Example 3
A preparation method of a lignin-modified styrene-butadiene rubber thermoplastic elastomer comprises the following steps:
(1) adding guaiacyl lignin and 4,4' -diphenylmethane diisocyanate into a toluene solvent, carrying out ultrasonic treatment, heating and stirring for reaction to obtain isocyanated guaiacyl lignin;
(2) adding 10g of isocyanated guaiacyl lignin and 20g of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy into 100ml of dimethylformamide solvent, heating and stirring for nucleophilic addition reaction at the temperature of 60 ℃ for 12h, and after the reaction is finished, filtering, washing and drying in vacuum to obtain a lignin cross-linking agent;
(3) weighing 30g of lignin crosslinking agent and 25g of butadiene styrene rubber, uniformly mixing, stirring and reacting at the temperature of 130 ℃, the reaction time of 7h and the stirring speed of 300 r/min to obtain lignin crosslinking agent modified butadiene styrene rubber;
(4) weighing 50g of lignin crosslinking agent modified styrene butadiene rubber, 20g of high density polyethylene, 22g of filler montmorillonite, 5g of plasticizer white oil, 0.8g of sulfur, 0.9g of accelerator, 1.2g of accelerator DM, 4g of zinc oxide and 0.7g of low molecular wax, blending, adding the mixture into a double-screw extruder, reacting and extruding, wherein the reaction temperature is 170 ℃, the rotating speed of a screw is 40 revolutions per minute, granulating, and injecting by an injection molding machine to prepare the lignin modified styrene butadiene rubber thermoplastic elastomer.
Example 4
A preparation method of a lignin-modified styrene-butadiene rubber thermoplastic elastomer comprises the following steps:
(1) adding guaiacyl lignin and 4,4' -diphenylmethane diisocyanate into a toluene solvent, carrying out ultrasonic treatment, heating and stirring for reaction to obtain isocyanated guaiacyl lignin;
(2) adding 10g of isocyanated guaiacyl lignin and 20g of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy into 100ml of dimethylformamide solvent, heating and stirring for nucleophilic addition reaction at the temperature of 70 ℃ for 16h, and after the reaction is finished, filtering, washing and drying in vacuum to obtain a lignin cross-linking agent;
(3) weighing 30g of lignin crosslinking agent and 25g of butadiene styrene rubber, uniformly mixing, stirring and reacting at the temperature of 140 ℃, the reaction time of 8 hours and the stirring speed of 300 revolutions per minute to obtain lignin crosslinking agent modified butadiene styrene rubber;
(4) weighing 70g of lignin crosslinking agent modified styrene butadiene rubber, 30g of high density polyethylene, 25g of filler montmorillonite, 10g of plasticizer white oil, 1.0g of sulfur, 1.5g of accelerator DM, 5g of zinc oxide and 1g of low molecular wax, blending, adding the mixture into a double-screw extruder, reacting and extruding, wherein the reaction temperature is 175 ℃, the screw rotation speed is 50 revolutions per minute, granulating, and injecting by an injection molding machine to prepare the lignin modified styrene butadiene rubber thermoplastic elastomer.
Comparative example 1
The preparation method of the styrene-butadiene rubber thermoplastic elastomer comprises the following steps:
weighing 40g of styrene butadiene rubber, 10g of high-density polyethylene, 20g of filler montmorillonite, 2g of plasticizer white oil, 0.6g of sulfur, 0.8g of accelerator, 1.0g of accelerator DM, 2g of zinc oxide and 0.5g of low molecular wax, blending the materials, adding the mixture into a double-screw extruder, reacting and extruding the mixture at the reaction temperature of 160 ℃ and the screw rotation speed of 30 revolutions per minute, granulating, and injecting the mixture through an injection molding machine to prepare the styrene butadiene rubber thermoplastic elastomer.
Comparative example 2
The preparation method of the styrene-butadiene rubber thermoplastic elastomer comprises the following steps:
(1) weighing 30g of lignin and 25g of styrene butadiene rubber, uniformly mixing, wherein the stirring temperature is 120 ℃, the stirring time is 6 hours, and the stirring speed is 300 revolutions per minute to obtain a mixture of the lignin and the styrene butadiene rubber;
(2) weighing 40g of a mixture of lignin and styrene butadiene rubber, 10g of high-density polyethylene, 20g of filler montmorillonite, 2g of plasticizer white oil, 0.6g of sulfur, 0.8g of accelerator, 1.0g of accelerator DM, 2g of zinc oxide and 0.5g of low molecular wax, blending, adding the mixture into a double-screw extruder, reacting and extruding, wherein the reaction temperature is 160 ℃, the rotating speed of a screw is 30 revolutions per minute, granulating, and injecting by an injection molding machine to prepare the lignin-mixed styrene butadiene rubber thermoplastic elastomer.
Product performance test:
test subjects: the thermoplastic elastomers of examples 1 to 4 and comparative examples 1 to 2 were used as test specimens
The test contents are as follows:
(1) shore hardness test according to the method specified in the standard (ASTM D2240) with units a;
(2) the specific gravity test was carried out according to the method specified in the Standard (ASTM D955-08) and has the unit of g/cm3；
(3) Compression set room temperature 22 hour test in% by weight according to the method specified in the standard (ASTM D395B);
(4) the melt flow rate is carried out according to the method specified in the Standard (ASTM D1238) in g/10 min;
(5) elongation at break tests were carried out according to the method specified in the Standard (GB/T528-1998) in%;
(6) tensile strength tests were carried out in MPa according to the method specified in the Standard (GB/T528-1998).
The test results are shown in table 1:
TABLE 1
As can be seen from the results in Table 1, the styrene-butadiene rubber thermoplastic elastomers in examples 1-4 have excellent mechanical properties, and compared with comparative examples 1-2, have the advantages of high Shore hardness, small specific gravity, good recovery performance after compression deformation at room temperature for 22 hours, fast melt flow rate, large elongation at break, and high tensile strength.
The styrene-butadiene rubber thermoplastic elastomers in the examples and comparative examples were pulverized into powder samples having a particle size of less than 1mm by a pulverizer. The oxidation induction time test was performed: at room temperature, the open aluminum crucible containing 10mg of the powder sample and the aluminum crucible of the reference sample are placed on a sample support of a differential scanning calorimeter, nitrogen with the flow rate of 50ml/min is introduced for 5min, then the temperature is raised to 200 ℃ at the temperature rise rate of 20 ℃/min, and then the temperature is kept for 5 min. The gas was then rapidly switched by means of a gas converter to oxygen at a flow rate of 50ml/min and the thermostating was continued until the test was terminated when the exothermic oxidation heat reached a maximum as shown on the recorded thermal curve of the energy-time relationship. After the experiment was completed, the gas was switched to nitrogen and the instrument was cooled to room temperature. The test was repeated 3 times for each sample and the average was taken as the final test result, which is shown in table 2.
TABLE 2
From the results shown in Table 2, it is understood that the oxidation induction time of the styrene-butadiene rubber thermoplastic elastomer in examples 1 to 4 is increased as the mass of the lignin crosslinking agent-modified styrene-butadiene rubber is increased, and the oxidation resistance is enhanced as the oxidation induction time is longer. The styrene butadiene rubber thermoplastic elastomer in the comparative example 1 is not added with lignin, so that the oxidation resistance is the worst, the lignin in the styrene butadiene rubber thermoplastic elastomer in the comparative example 2 does not form a heat reversible alkoxyamine structure with the styrene butadiene rubber, and the lignin is added into the styrene butadiene rubber thermoplastic elastomer in a blending mode, so that the dispersibility is poor, and the oxidation resistance is reduced. The styrene-butadiene rubber thermoplastic elastomers of comparative example 1 and comparative example 2 are inferior to example 1 in oxidation resistance, which shows that the lignin-modified styrene-butadiene rubber thermoplastic elastomer prepared by the present invention has good oxidation resistance.
Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention; it will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.
Claims (6)
1. The lignin-modified styrene-butadiene rubber thermoplastic elastomer is characterized by comprising the following components in parts by weight: 40-70 parts of lignin cross-linking agent modified styrene-butadiene rubber, 10-30 parts of high-density polyethylene, 20-25 parts of filler, 2-10 parts of plasticizer, 0.6-1.0 part of sulfur, 0.8-1.5 parts of accelerator M, 1.0-1.5 parts of accelerator DM, 2-5 parts of zinc oxide and 0.5-1 part of low molecular wax, wherein the lignin cross-linking agent modified styrene-butadiene rubber consists of lignin cross-linking agent and styrene-butadiene rubber, and the lignin cross-linking agent consists of 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy and isocyanated guaiacyl lignin.
2. The lignin-modified styrene-butadiene rubber thermoplastic elastomer according to claim 1, wherein the filler is montmorillonite, and the plasticizer is white oil.
3. The method for preparing the lignin-modified styrene-butadiene rubber thermoplastic elastomer according to claim 1, comprising the following steps:
(1) adding guaiacyl lignin and 4,4' -diphenylmethane diisocyanate into a toluene solvent, carrying out ultrasonic treatment, heating and stirring for reaction to obtain isocyanated guaiacyl lignin;
(2) adding isocyanated guaiacyl lignin and 4-hydroxy-2, 2,6, 6-tetramethyl piperidinyloxy into 100ml of dimethylformamide solvent, heating and stirring, carrying out nucleophilic addition reaction, and after the reaction is finished, filtering, washing and drying in vacuum to obtain a lignin cross-linking agent;
(3) weighing lignin crosslinking agent and butadiene styrene rubber, and uniformly mixing and reacting to obtain lignin crosslinking agent modified butadiene styrene rubber;
(4) weighing lignin cross-linking agent modified styrene butadiene rubber, high-density polyethylene, a filler, a plasticizer, sulfur, an accelerator DM, zinc oxide and low molecular wax which are weighed according to the weight components, blending the materials together, adding the mixture into a double-screw extruder for reaction and extrusion, granulating, and then injecting the mixture through an injection molding machine to prepare the lignin modified styrene butadiene rubber thermoplastic elastomer.
4. The method for preparing a lignin-modified styrene-butadiene rubber thermoplastic elastomer according to claim 3, wherein the mass ratio of the isocyanated guaiacyl lignin to the 4-hydroxy-2, 2,6, 6-tetramethylpiperidinyloxy in the step (2) is 10: 20, the reaction temperature is 50-70 ℃, and the reaction time is 10-16 h.
5. The method for preparing a lignin-modified styrene-butadiene rubber thermoplastic elastomer according to claim 3, wherein the mass ratio of the lignin crosslinking agent to the styrene-butadiene rubber in the step (3) is 30: 25, the reaction temperature is 120-140 ℃, and the reaction time is 6-8 h.
6. The method for preparing a lignin-modified styrene-butadiene rubber thermoplastic elastomer according to claim 3, wherein the reaction temperature in the step (4) is 160 ℃ to 175 ℃, and the screw rotation speed is 30 to 50 revolutions per minute.
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