CN114058133B - Preparation method of PS material with high creep resistance - Google Patents
Preparation method of PS material with high creep resistance Download PDFInfo
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- CN114058133B CN114058133B CN202111474050.XA CN202111474050A CN114058133B CN 114058133 B CN114058133 B CN 114058133B CN 202111474050 A CN202111474050 A CN 202111474050A CN 114058133 B CN114058133 B CN 114058133B
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- C08K3/041—Carbon nanotubes
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
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- 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
- C08K2201/00—Specific properties of additives
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Abstract
The invention provides a preparation method of a high creep resistance PS material, which comprises the following steps: adding montmorillonite into water, heating and stirring to disperse uniformly; adding alkyl ammonium salt at 70 ℃ for stirring reaction, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the alkyl ammonium salt is completed until the product does not contain halide ions; drying the product and grinding to obtain organic montmorillonite; and (3) uniformly mixing the organic montmorillonite, the modified carbon nano tube and the PS material in a high-speed stirrer, and then carrying out melt blending and granulation in a double-screw extruder to obtain the PS material with high creep resistance. According to the invention, the injection molding sample is converted into a bicontinuous structure from a sea-island structure by adding the organic montmorillonite and the modified carbon nano tube into the PS material, so that the injection molding sample has very good mechanical property and creep resistance, and the notch impact strength, the bending modulus and the tensile strength can be respectively up to 106.8J/m, 203.7Mpa, 5176Mpa and 66.4Mpa.
Description
Technical Field
The invention relates to the field of plastic materials, in particular to a preparation method of a high-creep-resistance PS material.
Background
Polystyrene (PS) is a nontoxic, odorless and colorless transparent particle, and is one of the wide variety of synthetic resins widely used today. The traditional polystyrene has the advantages of extremely high transparency, light transmittance up to more than 90%, good electrical insulation performance, easy coloring, good processing fluidity and chemical corrosion resistance, low price and the like, but the traditional polystyrene has a plurality of defects such as brittleness, low impact strength and easy occurrence of stress cracking, and the application range of the polystyrene is greatly limited. At present, in order to solve the defects of the traditional polystyrene, the method of blending the polystyrene with rubber or copolymerizing the polystyrene with other resins is mainly adopted for improvement. Although these methods improve the toughness and stress cracking resistance of polystyrene to some extent, they also greatly reduce the rigidity and increase the cost.
Creep is one of the most typical manifestations of viscoelastic materials, polymers are typical viscoelastic materials, and PS materials also have creep properties. According to the general rule of material creep, the relation between creep deformation and time has 3 stages, namely an initial stage, a stable stage and a final stage. In the initial stage, the creep rate gradually decreases with the increase of time, the creep rate in the stable stage is constant, and the creep rate in the final stage is continuously increased until creep rupture occurs. Meanwhile, creep is related to the magnitude of external force and the temperature, the temperature is increased, the external force is increased, and the creep rate is increased. The material structure tends to be unstable in advance due to creep, so it is necessary to study how to improve the creep resistance of PS materials.
Disclosure of Invention
The technical problems to be solved are as follows: according to the invention, the injection molding sample is converted into a bicontinuous structure from a sea-island structure by adding the organic montmorillonite and the modified carbon nano tube into the PS material, so that the injection molding sample has very good mechanical property and creep resistance, and the notch impact strength, the bending modulus and the tensile strength can be respectively up to 106.8J/m, 203.7Mpa, 5176Mpa and 66.4Mpa.
The technical scheme is as follows: the preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 200-300 parts of water, heating to 50-70 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding alkyl ammonium salt at 70 ℃ for stirring reaction, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the alkyl ammonium salt is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) And (3) uniformly mixing the organic montmorillonite, the modified carbon nano tube and the PS material in a high-speed stirrer, and then carrying out melt blending and granulation in a double-screw extruder to obtain the PS material with high creep resistance.
Further, the mass ratio of montmorillonite to alkyl ammonium salt is (95-98): 2-5.
Further, the alkyl ammonium salt is dodecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide or octadecyl trimethyl ammonium bromide.
Further, the processing method of the modified carbon nano tube comprises the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the carbon nano tube by distilled water, wherein the volume ratio of the nitric acid to the sulfuric acid in the mixed solution of the nitric acid and the sulfuric acid is 1:1. Further, in the step (4), the mass ratio of the organized montmorillonite, the modified carbon nano tube and the PS material is (1-10)/(80-98).
Further, the temperatures of each section of the double-screw extruder from the feed inlet to the machine head are respectively as follows: 140. 230, 250, 240 ℃, the screw speed is 110rpm.
The beneficial effects are that:
1. according to the invention, the injection molding sample is converted from a sea-island structure to a bicontinuous structure by adding the organic montmorillonite and the modified carbon nano tube into the PS material. The following three functions exist in the blending system: the phase separation process of the PS material and the modified carbon nano tube, the interaction force between montmorillonite layers and the strong adsorption effect of the montmorillonite layers on the PS material. Under the mutual influence and coupling of the three processes, the special morphological structure with montmorillonite as a framework and PS material adsorbed thereon to form a continuous phase is finally formed.
2. The modified carbon nano tube has carboxyl capable of reacting with amino in the PS material, and during the blending process, part of the PS material is chemically reacted with the carbon nano tube and grafted on the carbon nano tube, and the acting force with covalent bond connection is different from physical adsorption and can not be dissolved by formic acid.
3. The PS material with high creep resistance has very good mechanical property and creep resistance, and the notch impact strength, the bending modulus and the tensile strength can be respectively up to 106.8J/m, 203.7Mpa, 5176Mpa and 66.4Mpa.
Detailed Description
Example 1
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 200 parts of water, heating to 50 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding dodecyl trimethyl ammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the dodecyl trimethyl ammonium bromide to the montmorillonite is 2:98, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the dodecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 1:1:98; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 2
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 220 parts of water, heating to 55 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding dodecyl trimethyl ammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the dodecyl trimethyl ammonium bromide to the montmorillonite is 3:97, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the dodecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 1:2:97; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 3
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 230 parts of water, heating to 55 ℃, and stirring to uniformly disperse;
(2) Adding dodecyl trimethyl ammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the dodecyl trimethyl ammonium bromide to the montmorillonite is 3:97, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the dodecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 1:5:94; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 4
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 240 parts of water, heating to 60 ℃, and stirring to uniformly disperse the montmorillonite;
(2) At 70 ℃, adding hexadecyl trimethyl ammonium bromide, stirring and reacting, wherein the mass ratio of dodecyl trimethyl ammonium bromide to montmorillonite is 3:97, and repeatedly washing and suction filtering the obtained precipitate after the cation exchange of Meng Tuoshi and dodecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and then washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 1:8:91; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 5
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 250 parts of water, heating to 60 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding cetyltrimethylammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the cetyltrimethylammonium bromide to the montmorillonite is 4:96, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and cetyltrimethylammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 1:10:89; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 6
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 260 parts of water, heating to 65 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding cetyltrimethylammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the cetyltrimethylammonium bromide to the montmorillonite is 4:96, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and cetyltrimethylammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 2:5:93; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 7
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 270 parts of water, heating to 65 ℃, and stirring to uniformly disperse;
(2) Adding cetyltrimethylammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the cetyltrimethylammonium bromide to the montmorillonite is 3:97, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the cetyltrimethylammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 5:5:90; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 8
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 280 parts of water, heating to 65 ℃, and stirring to uniformly disperse the montmorillonite;
(2) At 70 ℃, adding octadecyl trimethyl ammonium bromide, stirring and reacting, wherein the mass ratio of the octadecyl trimethyl ammonium bromide to the montmorillonite is 2:98, and repeatedly washing and suction filtering the obtained precipitate after the cation exchange of Meng Tuo and the octadecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 8:5:87; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 9
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 290 parts of water, heating to 65 ℃, and stirring to uniformly disperse the montmorillonite;
(2) At 70 ℃, adding octadecyl trimethyl ammonium bromide, stirring and reacting, wherein the mass ratio of the octadecyl trimethyl ammonium bromide to the montmorillonite is 4:96, and repeatedly washing and suction filtering the obtained precipitate after the cation exchange of Meng Tuo and the octadecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 8:8:84; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 10
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 290 parts of water, heating to 65 ℃, and stirring to uniformly disperse the montmorillonite;
(2) At 70 ℃, adding octadecyl trimethyl ammonium bromide, stirring and reacting, wherein the mass ratio of the octadecyl trimethyl ammonium bromide to the montmorillonite is 5:95, and repeatedly washing and suction filtering the obtained precipitate after the cation exchange of Meng Tuo and the octadecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 9:7:84; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 11
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 300 parts of water, heating to 70 ℃, and stirring to uniformly disperse the montmorillonite;
(2) At 70 ℃, adding octadecyl trimethyl ammonium bromide, stirring and reacting, wherein the mass ratio of the octadecyl trimethyl ammonium bromide to the montmorillonite is 5:95, and repeatedly washing and suction filtering the obtained precipitate after the cation exchange of Meng Tuo and the octadecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 10:8:82; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Example 12
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 300 parts of water, heating to 70 ℃, and stirring to uniformly disperse the montmorillonite;
(2) At 70 ℃, adding octadecyl trimethyl ammonium bromide, stirring and reacting, wherein the mass ratio of the octadecyl trimethyl ammonium bromide to the montmorillonite is 5:95, and repeatedly washing and suction filtering the obtained precipitate after the cation exchange of Meng Tuo and the octadecyl trimethyl ammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 10:10:80; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Comparative example 1
The difference between this example and example 5 is the use of untreated montmorillonite.
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) After montmorillonite, modified carbon nano tube and PS material are evenly mixed in a high-speed stirrer, melt blending and granulation are carried out in a double-screw extruder, and the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 1:10:89; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
Comparative example 2
The difference between this example and example 5 is that the modified carbon nanotubes are replaced with organized montmorillonite.
The preparation method of the PS material with high creep resistance comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 250 parts of water, heating to 60 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding cetyltrimethylammonium bromide at 70 ℃ for stirring reaction, wherein the mass ratio of the cetyltrimethylammonium bromide to the montmorillonite is 4:96, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and cetyltrimethylammonium bromide is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) After the organic montmorillonite, the modified carbon nano tube and the PS material are uniformly mixed in a high-speed stirrer, carrying out melt blending and granulation in a double-screw extruder, wherein the temperatures of each section of the double-screw extruder from a feed inlet to a machine head are respectively as follows: 140. 230, 250, 240 ℃ and the screw rotating speed is 110rpm, thus obtaining the PS material with high creep resistance, wherein the modified carbon nano tube is processed by the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and then washing, filtering and drying the mixture by distilled water, wherein the mass ratio of the organized montmorillonite to the modified carbon nano tube to the PS material is 11:89; the volume ratio of nitric acid to sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1.
TABLE 1
Claims (2)
1. A preparation method of a PS material with high creep resistance is characterized by comprising the following steps: the preparation method comprises the following steps in parts by weight:
(1) Adding 100 parts of montmorillonite into 200-300 parts of water, heating to 50-70 ℃, and stirring to uniformly disperse the montmorillonite;
(2) Adding alkyl ammonium salt at 70 ℃ for stirring reaction, and repeatedly washing and filtering the obtained precipitate after the cation exchange of Meng Tuoshi and the alkyl ammonium salt is completed until the product does not contain halide ions;
(3) Drying the product and grinding to obtain organic montmorillonite;
(4) Uniformly mixing the organic montmorillonite, the modified carbon nano tube and the PS material in a high-speed stirrer, and then carrying out melt blending and granulation in a double-screw extruder to obtain the PS material with high creep resistance;
the mass ratio of the montmorillonite to the alkyl ammonium salt is (95-98): 2-5;
the alkyl ammonium salt is dodecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide or octadecyl trimethyl ammonium bromide;
the treatment method of the modified carbon nano tube comprises the following steps: boiling and refluxing the carbon nano tube in a mixed solution of nitric acid and sulfuric acid for 4 hours, and washing, filtering and drying the carbon nano tube by distilled water, wherein the volume ratio of the nitric acid to the sulfuric acid in the mixed solution of nitric acid and sulfuric acid is 1:1;
in the step (4), the mass ratio of the organic montmorillonite, the modified carbon nano tube and the PS material is (1-10)/(80-98).
2. The method for preparing the high creep-resistant PS material according to claim 1, wherein the method comprises the following steps: the temperatures of each section of the double-screw extruder from the feed inlet to the machine head are respectively as follows: 140. 230, 250, 240 ℃, the screw speed is 110rpm.
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