CN113150485A - Humidity-independent antistatic material and preparation process thereof - Google Patents
Humidity-independent antistatic material and preparation process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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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
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/04—Antistatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention relates to the technical field of antistatic material preparation, in particular to a humidity-independent antistatic material and a preparation process thereof; the feed is prepared from the following raw materials in parts by weight: 60-80 parts of modified LDPE, 15-30 parts of PVC, 8-15 parts of a compound antistatic agent, 4-7 parts of styrene-N-phenyl maleimide-maleic anhydride copolymer, 0.8-1.8 parts of hydroxybenzotriazole, 8-12 parts of a filler, 1.8-3.2 parts of a plasticizer, 0.6-1.0 part of temperature-resistant zinc stearate and 0.6-1.5 parts of a lubricant; according to the invention, the antistatic performance of the prepared antistatic material is obviously improved through the mutual synergistic cooperation between the modified LDPE and the compound antistatic agent; in addition, the antistatic performance of the antistatic agent prepared by the invention does not depend on the relative humidity of the environment, and the antistatic agent has stable antistatic performance.
Description
Technical Field
The invention relates to the technical field of preparation of antistatic materials, in particular to a humidity-independent antistatic material and a preparation process thereof.
Background
Static electricity is formed by the redistribution of charges caused by friction, and also by the mutual attraction of charges. In general, the positive charge of the nucleus is equal to the negative charge of the electron, and the positive and negative charges are balanced, so that the nucleus does not exhibit electric properties. However, if electrons are forced off the orbit, an unbalanced electron distribution is caused, such as substantial tribocharging, which is a process causing an imbalance of positive and negative charges. When two different objects are in contact with each other and rub against each other, electrons of one object are transferred to the other object, which is positively charged due to the lack of electrons, while the other object gets some remaining electrons and is negatively charged, which is charged with static electricity.
The polymer material is a material based on a polymer compound, and is a material composed of a compound having a relatively high molecular mass, including rubber, plastic, fiber, paint, adhesive, and polymer-based composite material, and is an organic compound having a repeating structural unit, which has a particularly large relative molecular mass, and is formed by covalently bonding a large number of atoms to each other. In the process of researching the high polymer material, the high polymer material has higher application capability due to the special structure, and has positive effects in the specific application process. The significant advantages and outstanding performances of the polymer material are determined by the application effect of the polymer material.
The polymer material has the excellent performance, so the polymer material is widely applied to the engineering field, but the electrostatic discharge performance of the polymer material is relatively poor, which seriously influences the quality and the application of the polymer material in the engineering field. Therefore, in engineering, a proper amount of antistatic agent is often added in the preparation of the polymer material to improve the antistatic performance of the polymer material. However, the antistatic performance of the antistatic materials manufactured by adding commercially available antistatic agents is relatively poor, and further improvement is still needed.
Based on the above, the invention provides a humidity-independent antistatic material and a preparation process thereof, so as to solve the above problems.
Disclosure of Invention
The invention aims to provide a humidity-independent antistatic material and a preparation process thereof, and the antistatic performance of the prepared antistatic material is remarkably improved by the mutual synergistic cooperation between the modified LDPE and the compound antistatic agent; in addition, the antistatic performance of the antistatic agent prepared by the invention does not depend on the relative humidity of the environment, and the antistatic agent has stable antistatic performance.
In order to achieve the purpose, the invention provides the following technical scheme:
a humidity-independent antistatic material is prepared from the following raw materials in parts by weight: 60-80 parts of modified LDPE, 15-30 parts of PVC, 8-15 parts of a compound antistatic agent, 4-7 parts of styrene-N-phenyl maleimide-maleic anhydride copolymer, 0.8-1.8 parts of hydroxybenzotriazole, 8-12 parts of a filler, 1.8-3.2 parts of a plasticizer, 0.6-1.0 part of temperature-resistant zinc stearate and 0.6-1.5 parts of a lubricant.
Further, the preparation method of the modified LDPE comprises the following steps: according to the weight ratio of 70-130: 1.2-2.8: 8-16, respectively and accurately weighing LDPE, an initiator and 3-sulfonic acid ester potassium salt of methacrylic acid, and then adding the LDPE, the initiator and the 3-sulfonic acid ester potassium salt of methacrylic acid into a proper amount of dimethylbenzene; after uniformly mixing and stirring, heating the temperature of the obtained mixed solution to 120-140 ℃, and carrying out reflux reaction for 3-5 h at the temperature; after the reaction is finished, recovering xylene by an evaporation method, transferring the obtained reaction product into a constant-temperature drying oven, and drying the reaction product at the temperature of 70-80 ℃; and grinding the dried reaction product to obtain the modified LDPE, wherein the particle size of the ground LDPE is 150-300 meshes.
Furthermore, the dosage ratio of the LDPE to the xylene is 0.16-0.3 g/mL.
Furthermore, the initiator is selected from azo initiators, which are selected from any one of azobisisobutyronitrile or azobisisoheptonitrile.
Furthermore, the preparation method of the compound antistatic agent comprises the following steps:
firstly, preparing a modifier;
adding a proper amount of Boltorn H30 into a proper amount of DMF according to the standard of 0.1-0.15 g/mL, and stirring under magnetic force until the solid matter is completely dissolved; adding sodium hydroxide to dissolve and adjusting the pH value of the mixed solution to 8.0-9.5; slowly dropwise adding 18-25% of epoxy bromopropane into the reaction system, heating to 60-70 ℃ under the protection of nitrogen, and reacting for 30-45 min; removing solid substances through vacuum filtration, slowly adding 15-30% by mass of octadecyl dimethyl tertiary amine into the obtained filtrate, and continuously reacting for 20-30 min at 50-60 ℃; then, after rotary evaporation to remove the solvent and vacuum drying, the obtained modifier is stored for later use;
secondly, preparing a compound antistatic agent;
and (2) putting the activated nano carbon black into ethanol according to a solid-liquid ratio of 0.06-0.1 g/mL, adding a modifier with the mass of 10-25% of the ethanol, carrying out ultrasonic reaction for 20-30 min at the frequency of 30-35 kHz, and after the reaction is finished, sequentially carrying out reduced pressure suction filtration, alcohol washing and vacuum drying treatment to obtain the compound antistatic agent.
Further, the activation treatment process of the nano carbon black comprises the following steps: placing nano carbon black in Ar/H2In the O plasma discharge area, the polymer powder is continuously stirred; and (3) turning on a power supply to generate plasma discharge with the discharge power of 50-250W, and performing plasma discharge treatment for 30-50 min to obtain the activated nano carbon black.
Furthermore, the filler is selected from any one of calcium carbonate and talcum powder.
Furthermore, the plasticizer is any one of diisooctyl phthalate, dioctyl terephthalate and dioctyl adipate.
Furthermore, the lubricant is any one of paraffin, polyethylene wax and oxidized polyethylene wax.
A preparation process of a humidity-independent antistatic material comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts; grinding the solid raw materials to particles with the particle size of 100-200 meshes, and storing for later use;
s2, placing PVC in an ozone generator, and generating 1.2-1.5 g/h of ozone at 25-30 ℃ and at a pure oxygen inlet flow rate of 3.2-3.8L/h, wherein the activation time is 15-25 min;
and S3, uniformly mixing the weighed raw materials, discharging, transferring into a double-screw extruder for melt blending, and sequentially extruding, cooling and granulating to obtain the finished product of the humidity-independent antistatic material.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the LDPE is chemically modified by the initiator and the 3-sulfonate potassium methacrylate, and the LDPE and the 3-sulfonate potassium methacrylate are chemically reacted to form a bond under the action of the initiator, so that the chemical modification of the LDPE is finally realized, and the antistatic property of the modified LDPE material is greatly improved.
In addition, Boltorn H30, epoxy bromopropane, octadecyl dimethyl tertiary amine and the like are used as raw materials for preparing the modifier, and then the obtained activated nano carbon black and the modifier are subjected to ultrasonic reaction treatment, so that Boltorn H30 is grafted on the surface of the activated nano carbon black through chemical reaction, and not only can the nano carbon black be effectively modified, the compatibility of the nano carbon black with modified LDPE and PVC is enhanced, but also the antistatic performance of the nano carbon black can be effectively improved. The modified LDPE and the compound antistatic agent are cooperated with each other, so that the antistatic performance of the prepared antistatic material is obviously improved. In addition, the antistatic performance of the antistatic agent prepared by the invention does not depend on the relative humidity of the environment, and the antistatic agent has stable antistatic performance.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A humidity-independent antistatic material is prepared from the following raw materials in parts by weight: 60 parts of modified LDPE, 15 parts of PVC, 8 parts of a compound antistatic agent, 4 parts of styrene-N-phenylmaleimide-maleic anhydride copolymer, 0.8 part of hydroxybenzotriazole, 8 parts of a filler, 1.8 parts of a plasticizer, 0.6 part of temperature-resistant zinc stearate and 0.6 part of a lubricant.
The preparation method of the modified LDPE comprises the following steps: according to the proportion of 70: 1.2: 8, accurately weighing LDPE, an initiator and 3-potassium methacrylate sulfonate, and adding the LDPE, the initiator and the potassium methacrylate into proper amount of dimethylbenzene; after mixing and stirring uniformly, raising the temperature of the obtained mixed solution to 120 ℃, and carrying out reflux reaction for 3 hours at the temperature; after the reaction is finished, recovering dimethylbenzene by an evaporation method, transferring the obtained reaction product into a constant-temperature drying box, and drying the reaction product at the temperature of 70 ℃; and grinding the dried reaction product to obtain the modified LDPE with the particle size of 150 meshes.
The dosage ratio of LDPE to xylene is 0.16 g/mL.
The initiator is azo initiator, which is azobisisobutyronitrile.
The preparation method of the compound antistatic agent comprises the following steps:
firstly, preparing a modifier;
adding a proper amount of Boltorn H30 into a proper amount of DMF according to the standard of 0.1g/mL, and stirring by magnetic force until the solid matter is completely dissolved; adjusting the pH value of the mixed solution to 8.0 by adding sodium hydroxide for dissolution; then, slowly dropwise adding 18% of epoxy bromopropane into the reaction system, heating to 60 ℃ under the protection of nitrogen, and reacting for 30 min; removing solid substances by vacuum filtration, slowly adding 15% octadecyl dimethyl tertiary amine into the obtained filtrate, and continuously reacting at 50 deg.C for 20 min; then, after rotary evaporation to remove the solvent and vacuum drying, the obtained modifier is stored for later use;
secondly, preparing a compound antistatic agent;
and (2) putting the activated nano carbon black into ethanol according to a solid-liquid ratio of 0.06g/mL, adding a modifier with the mass of 10% of the ethanol, carrying out ultrasonic reaction for 20min at the frequency of 30kHz, and after the reaction is finished, sequentially carrying out reduced pressure suction filtration, alcohol washing and vacuum drying treatment to obtain the compound antistatic agent.
The activation treatment process of the nano carbon black comprises the following steps: placing nano carbon black in Ar/H2In the O plasma discharge area, the polymer powder is continuously stirred; and (3) turning on a power supply to generate plasma discharge with the discharge power of 50W, and carrying out plasma discharge treatment for 30min to obtain the activated nano carbon black.
The filler is calcium carbonate.
The plasticizer is diisooctyl phthalate.
The lubricant is paraffin.
A preparation process of a humidity-independent antistatic material comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts; grinding the solid raw materials to particles with the particle size of 100 meshes, and storing for later use;
s2, placing PVC in an ozone generator, and generating 1.2g/h of ozone at 25 ℃ and at the pure oxygen inlet flow rate of 3.2L/h, wherein the activation time is 15 min;
and S3, uniformly mixing the weighed raw materials, discharging, transferring into a double-screw extruder for melt blending, and sequentially extruding, cooling and granulating to obtain the finished product of the humidity-independent antistatic material.
Example 2
A humidity-independent antistatic material is prepared from the following raw materials in parts by weight: 70 parts of modified LDPE, 25 parts of PVC, 10 parts of compound antistatic agent, 5 parts of styrene-N-phenylmaleimide-maleic anhydride copolymer, 1.3 parts of hydroxybenzotriazole, 10 parts of filler, 2.5 parts of plasticizer, 0.8 part of temperature-resistant zinc stearate and 1.0 part of lubricant.
The preparation method of the modified LDPE comprises the following steps: according to the following steps of 100: 2.0: 12, accurately weighing LDPE, an initiator and 3-potassium methacrylate sulfonate, and adding the LDPE, the initiator and the potassium methacrylate into proper amount of dimethylbenzene; after mixing and stirring uniformly, raising the temperature of the obtained mixed solution to 130 ℃, and carrying out reflux reaction for 4 hours at the temperature; after the reaction is finished, recovering dimethylbenzene by an evaporation method, transferring the obtained reaction product into a constant-temperature drying box, and drying the reaction product at the temperature of 75 ℃; and grinding the dried reaction product to the particle size of 250 meshes to obtain the modified LDPE.
The dosage ratio of LDPE to xylene is 0.25 g/mL.
The initiator is azo initiator, which is azodiisoheptonitrile.
The preparation method of the compound antistatic agent comprises the following steps:
firstly, preparing a modifier;
adding a proper amount of Boltorn H30 into a proper amount of DMF according to the standard of 0.12g/mL, and stirring by magnetic force until the solid matter is completely dissolved; adjusting the pH value of the mixed solution to 8.5 by adding sodium hydroxide for dissolution; then slowly dripping 20% of epoxy bromopropane into the reaction system, heating to 65 ℃ under the protection of nitrogen, and reacting for 40 min; removing solid substances by vacuum filtration, slowly adding 25% by mass of octadecyl dimethyl tertiary amine into the obtained filtrate, and continuously reacting for 25min at 55 ℃; then, after rotary evaporation to remove the solvent and vacuum drying, the obtained modifier is stored for later use;
secondly, preparing a compound antistatic agent;
and (2) putting the activated nano carbon black into ethanol according to a solid-liquid ratio of 0.08g/mL, adding a modifier with the mass of 15% of the ethanol, carrying out ultrasonic reaction for 25min at the frequency of 32kHz, and after the reaction is finished, sequentially carrying out reduced pressure suction filtration, alcohol washing and vacuum drying treatment to obtain the compound antistatic agent.
The activation treatment process of the nano carbon black comprises the following steps: placing nano carbon black in Ar/H2In the O plasma discharge area, the polymer powder is continuously stirred; and (3) turning on a power supply to generate plasma discharge with the discharge power of 150W, and carrying out plasma discharge treatment for 40min to obtain the activated nano carbon black.
The filler is talcum powder.
The plasticizer is dioctyl terephthalate.
The lubricant is polyethylene wax.
A preparation process of a humidity-independent antistatic material comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts; grinding the solid raw materials to particles with the particle size of 150 meshes, and storing for later use;
s2, placing PVC in an ozone generator, and activating for 20min at 28 ℃ and a pure oxygen inlet flow rate of 3.5L/h to generate 1.4g/h ozone;
and S3, uniformly mixing the weighed raw materials, discharging, transferring into a double-screw extruder for melt blending, and sequentially extruding, cooling and granulating to obtain the finished product of the humidity-independent antistatic material.
Example 3
A humidity-independent antistatic material is prepared from the following raw materials in parts by weight: 80 parts of modified LDPE, 30 parts of PVC, 15 parts of compound antistatic agent, 7 parts of styrene-N-phenylmaleimide-maleic anhydride copolymer, 1.8 parts of hydroxybenzotriazole, 12 parts of filler, 3.2 parts of plasticizer, 1.0 part of temperature-resistant zinc stearate and 1.5 parts of lubricant.
The preparation method of the modified LDPE comprises the following steps: according to 130: 2.8: 16, accurately weighing LDPE, an initiator and 3-potassium methacrylate sulfonate, and adding the LDPE, the initiator and the potassium methacrylate into proper amount of dimethylbenzene; after mixing and stirring uniformly, raising the temperature of the obtained mixed solution to 140 ℃, and carrying out reflux reaction for 5 hours at the temperature; after the reaction is finished, recovering dimethylbenzene by an evaporation method, transferring the obtained reaction product into a constant-temperature drying box, and drying the reaction product at the temperature of 80 ℃; and grinding the dried reaction product to a particle size of 300 meshes to obtain the modified LDPE.
The dosage ratio of LDPE to xylene is 0.3 g/mL.
The initiator is azo initiator, which is azobisisobutyronitrile.
The preparation method of the compound antistatic agent comprises the following steps:
firstly, preparing a modifier;
adding a proper amount of Boltorn H30 into a proper amount of DMF according to the standard of 0.15g/mL, and stirring by magnetic force until the solid matter is completely dissolved; adjusting the pH value of the mixed solution to 9.5 by adding sodium hydroxide for dissolution; then slowly dripping 25 percent of epoxy bromopropane into the reaction system, heating to 70 ℃ under the protection of nitrogen, and reacting for 45 min; removing solid substances by vacuum filtration, slowly adding 30% octadecyl dimethyl tertiary amine into the obtained filtrate, and continuously reacting at 60 deg.C for 30 min; then, after rotary evaporation to remove the solvent and vacuum drying, the obtained modifier is stored for later use;
secondly, preparing a compound antistatic agent;
and (2) putting the activated nano carbon black into ethanol according to a solid-liquid ratio of 0.1g/mL, adding a modifier with the mass of 25% of the ethanol, carrying out ultrasonic reaction for 30min at the frequency of 35kHz, and after the reaction is finished, sequentially carrying out reduced pressure suction filtration, alcohol washing and vacuum drying treatment to obtain the compound antistatic agent.
The activation treatment process of the nano carbon black comprises the following steps: placing nano carbon black in Ar/H2In the O plasma discharge area, the polymer powder is continuously stirred; and (3) turning on a power supply to generate plasma discharge with the discharge power of 250W, and carrying out plasma discharge treatment for 50 min to obtain the activated nano carbon black.
The filler is calcium carbonate.
The plasticizer is selected from dioctyl adipate.
Oxidized polyethylene wax is selected as the lubricant.
A preparation process of a humidity-independent antistatic material comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts; grinding the solid raw materials to particles with the particle size of 200 meshes, and storing for later use;
s2, placing PVC in an ozone generator, and generating 1.5g/h of ozone at 30 ℃ and at the pure oxygen inlet flow rate of 3.8L/h, wherein the activation time is 25 min;
and S3, uniformly mixing the weighed raw materials, discharging, transferring into a double-screw extruder for melt blending, and sequentially extruding, cooling and granulating to obtain the finished product of the humidity-independent antistatic material.
Comparative example 1: the humidity-independent antistatic material prepared by the preparation method provided by the embodiment 1 of the invention is different in that: common LDPE is used for replacing modified LDPE in raw materials;
comparative example 2: the humidity-independent antistatic material prepared by the preparation method provided by the embodiment 1 of the invention is different in that: the nano carbon black is used for replacing a compound antistatic agent in the raw materials;
comparative example 3: the humidity-independent antistatic material prepared by the preparation method provided by the embodiment 1 of the invention is different in that: PVC used in the raw materials is not activated;
performance testing
The humidity-independent antistatic materials prepared by the embodiments 1 to 3 of the present invention are respectively referred to as experimental examples 1 to 3; the humidity-independent antistatic materials prepared by the comparative examples 1 to 3 are respectively marked as comparative examples 1 to 3; then, the humidity-independent antistatic materials prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to antistatic performance detection, and each set of obtained data was recorded in table 1:
TABLE 1
As can be seen from the relevant data in Table 1, the antistatic performance of the prepared antistatic material is remarkably improved by the synergistic cooperation between the modified LDPE and the compound antistatic agent. In addition, the antistatic performance of the antistatic agent prepared by the invention does not depend on the relative humidity of the environment, and the antistatic agent has stable antistatic performance. Therefore, the humidity-independent antistatic material prepared by the invention has wider market prospect and is more suitable for popularization.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. The humidity-independent antistatic material is characterized by being prepared from the following raw materials in parts by weight: 60-80 parts of modified LDPE, 15-30 parts of PVC, 8-15 parts of a compound antistatic agent, 4-7 parts of styrene-N-phenyl maleimide-maleic anhydride copolymer, 0.8-1.8 parts of hydroxybenzotriazole, 8-12 parts of a filler, 1.8-3.2 parts of a plasticizer, 0.6-1.0 part of temperature-resistant zinc stearate and 0.6-1.5 parts of a lubricant.
2. The humidity-independent antistatic material as claimed in claim 1, wherein the modified LDPE is prepared by the following steps: according to the weight ratio of 70-130: 1.2-2.8: 8-16, respectively and accurately weighing LDPE, an initiator and 3-sulfonic acid ester potassium salt of methacrylic acid, and then adding the LDPE, the initiator and the 3-sulfonic acid ester potassium salt of methacrylic acid into a proper amount of dimethylbenzene; after uniformly mixing and stirring, heating the temperature of the obtained mixed solution to 120-140 ℃, and carrying out reflux reaction for 3-5 h at the temperature; after the reaction is finished, recovering xylene by an evaporation method, transferring the obtained reaction product into a constant-temperature drying oven, and drying the reaction product at the temperature of 70-80 ℃; and grinding the dried reaction product to obtain the modified LDPE, wherein the particle size of the ground LDPE is 150-300 meshes.
3. A humidity-independent antistatic material as claimed in claim 2, wherein: the dosage ratio of the LDPE to the xylene is 0.16-0.3 g/mL.
4. A humidity-independent antistatic material as claimed in claim 2, wherein: the initiator is azo initiator, and is selected from azobisisobutyronitrile or azobisisoheptonitrile.
5. The humidity-independent antistatic material as claimed in claim 1, wherein the preparation method of the compound antistatic agent comprises the following steps:
firstly, preparing a modifier;
adding a proper amount of Boltorn H30 into a proper amount of DMF according to the standard of 0.1-0.15 g/mL, and stirring under magnetic force until the solid matter is completely dissolved; adding sodium hydroxide to dissolve and adjusting the pH value of the mixed solution to 8.0-9.5; slowly dropwise adding 18-25% of epoxy bromopropane into the reaction system, heating to 60-70 ℃ under the protection of nitrogen, and reacting for 30-45 min; removing solid substances through vacuum filtration, slowly adding 15-30% by mass of octadecyl dimethyl tertiary amine into the obtained filtrate, and continuously reacting for 20-30 min at 50-60 ℃; then, after rotary evaporation to remove the solvent and vacuum drying, the obtained modifier is stored for later use;
secondly, preparing a compound antistatic agent;
and (2) putting the activated nano carbon black into ethanol according to a solid-liquid ratio of 0.06-0.1 g/mL, adding a modifier with the mass of 10-25% of the ethanol, carrying out ultrasonic reaction for 20-30 min at the frequency of 30-35 kHz, and after the reaction is finished, sequentially carrying out reduced pressure suction filtration, alcohol washing and vacuum drying treatment to obtain the compound antistatic agent.
6. The humidity-independent antistatic material as claimed in claim 5, wherein the activation treatment process of the nano carbon black is as follows: placing nano carbon black in Ar/H2In the O plasma discharge area, the polymer powder is continuously stirred; and (3) turning on a power supply to generate plasma discharge with the discharge power of 50-250W, and performing plasma discharge treatment for 30-50 min to obtain the activated nano carbon black.
7. A humidity-independent antistatic material as claimed in claim 1, wherein: the filler is any one of calcium carbonate and talcum powder.
8. A humidity-independent antistatic material as claimed in claim 1, wherein: the plasticizer is any one of diisooctyl phthalate, dioctyl terephthalate and dioctyl adipate.
9. A humidity-independent antistatic material as claimed in claim 1, wherein: the lubricant is any one of paraffin, polyethylene wax and oxidized polyethylene wax.
10. The process for preparing the humidity-independent antistatic material according to any one of claims 1 to 9, comprising the following steps:
s1, accurately weighing the raw materials according to the weight parts; grinding the solid raw materials to particles with the particle size of 100-200 meshes, and storing for later use;
s2, placing PVC in an ozone generator, and generating 1.2-1.5 g/h of ozone at 25-30 ℃ and at a pure oxygen inlet flow rate of 3.2-3.8L/h, wherein the activation time is 15-25 min;
and S3, uniformly mixing the weighed raw materials, discharging, transferring into a double-screw extruder for melt blending, and sequentially extruding, cooling and granulating to obtain the finished product of the humidity-independent antistatic material.
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