CN112662052A - Polypropylene modified material and preparation method thereof - Google Patents
Polypropylene modified material and preparation method thereof Download PDFInfo
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- CN112662052A CN112662052A CN202011344913.7A CN202011344913A CN112662052A CN 112662052 A CN112662052 A CN 112662052A CN 202011344913 A CN202011344913 A CN 202011344913A CN 112662052 A CN112662052 A CN 112662052A
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Abstract
The invention discloses a polypropylene modified material and a preparation method thereof, wherein the polypropylene modified material comprises the following raw materials in percentage by mass: 0.5-15% of modified magnesium hydroxide, 0.05-10% of polytetrafluoroethylene micro powder and the balance of polypropylene; the modified magnesium hydroxide is prepared by dry modification of magnesium hydroxide by adopting a silane coupling agent. In the invention, the modified magnesium hydroxide prepared by dry modification of magnesium hydroxide by adopting the silane coupling agent has simple components, convenient manufacture and good flame retardance, can be uniformly dispersed in the polypropylene material, has high compatibility and can improve the mechanical strength of the polypropylene material; the added polytetrafluoroethylene micro powder can not only synergistically enhance the anti-dripping performance of the polypropylene material with the modified magnesium hydroxide, but also reduce the friction coefficient of the polypropylene material, so that the polypropylene material is more wear-resistant.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene modified material and a preparation method thereof.
Background
The polypropylene material has excellent comprehensive performance and good chemical resistance, so the polypropylene material is widely used in the industries of packaging, textiles, building materials and the like. However, polypropylene is extremely easy to burn, and strong oxidative cracking can be generated in the burning process, so that molten drops are generated in the burning process, and fire accidents are extremely easy to cause; not only has low safety performance, but also becomes one of the main factors limiting the wider application of polypropylene materials.
In order to make the polypropylene material have flame retardant property, the chinese patent application with publication number CN107383623A discloses a polypropylene flame retardant material and a preparation method thereof, wherein the polypropylene flame retardant material comprises the following raw materials in parts by weight: 350-400 parts of co-polypropylene, 250-300 parts of homo-polypropylene, 80-90 parts of composite flame retardant, 40-60 parts of compatilizer and 5-15 parts of antioxidant; the composite flame retardant is prepared from magnesium hydroxide, nano-montmorillonite, a silane coupling agent and fatty acid, and the preparation method of the composite flame retardant comprises the following steps: mixing magnesium hydroxide and nano montmorillonite, heating to 100-120 ℃, adding a silane coupling agent, reacting while stirring for 10-15 min, cooling to 50-60 ℃, adding fatty acid, stirring uniformly, and cooling to room temperature.
The polypropylene flame-retardant material has the following defects: (1) the adopted composite coupling agent has more complex components and more complicated preparation process; (2) the material has poor anti-dripping performance, so that the flame retardant effect is poor.
Disclosure of Invention
The invention aims to provide a polypropylene modified material with simple components, strong anti-dripping performance and good flame retardant effect and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the polypropylene modified material comprises the following raw materials in percentage by mass: 0.5-15% of modified magnesium hydroxide, 0.05-10% of polytetrafluoroethylene micro powder and the balance of polypropylene;
the modified magnesium hydroxide is prepared by dry modification of magnesium hydroxide by adopting a silane coupling agent.
In the polypropylene modified material, the silane coupling agent is adopted to carry out dry modification on the magnesium hydroxide to prepare the modified magnesium hydroxide, so that the modified magnesium hydroxide has the advantages of simple components, convenient manufacture and good flame retardance, can be uniformly dispersed in the polypropylene material, has oleophylic surface and higher compatibility with polypropylene, and can improve the mechanical strength of the polypropylene material; the added polytetrafluoroethylene micro powder can not only synergistically enhance the anti-dripping performance of the polypropylene material with the modified magnesium hydroxide, but also reduce the friction coefficient of the polypropylene material, so that the polypropylene material is more wear-resistant.
Preferably, in the polypropylene modified material, the modified magnesium hydroxide comprises the following raw materials in percentage by mass: 97-99.9% of magnesium hydroxide and 0.1-3% of silane coupling agent.
Preferably, in the polypropylene modified material, the preparation method of the modified magnesium hydroxide comprises the following steps: preparing the silane coupling agent into a solution, spraying the solution on magnesium hydroxide, and then placing the solution at the temperature of 60-150 ℃ for bridging for 0.5-5 h to obtain the modified magnesium hydroxide. When in use, the silane coupling agent can be prepared into a solution with the volume fraction of 20 percent by adopting absolute ethyl alcohol and then sprayed on the magnesium hydroxide.
Preferably, in the polypropylene-modified material, the silane coupling agent is KH 550.
In the polypropylene modified material, the polytetrafluoroethylene micro powder is modified polytetrafluoroethylene micro powder, and the modified polytetrafluoroethylene micro powder is obtained by grafting the polytetrafluoroethylene micro powder subjected to plasma treatment and N- (benzocyclobutene-4-yl) maleimide under ultraviolet irradiation.
The N- (benzocyclobutene-4-yl) maleimide monomer is grafted on the surface of the polytetrafluoroethylene micro powder, so that the surface activity of the polytetrafluoroethylene micro powder can be improved, the surface free energy of the polytetrafluoroethylene micro powder is enhanced, and the compatibility of the obtained modified polytetrafluoroethylene micro powder and polypropylene is higher.
The polytetrafluoroethylene micro powder can be directly subjected to graft polymerization after being subjected to plasma treatment, so that the step of introducing peroxy radicals by exposing the polytetrafluoroethylene micro powder in the air is omitted; under ultraviolet irradiation, the N- (benzocyclobutene-4-yl) maleimide is not only a photoinitiator for graft polymerization reaction, but also a polymerization monomer, and no additional photoinitiator is required to be introduced into a reaction system, so that the reaction system is simpler, and the post-treatment step is simpler and more convenient.
Preferably, in the polypropylene modified material, the modified polytetrafluoroethylene micro powder is obtained by graft polymerization of the plasma-treated polytetrafluoroethylene micro powder and N- (benzocyclobutene-4-yl) maleimide under 200-400 nm ultraviolet irradiation for 2-120 min.
Preferably, in the polypropylene modified material, the modified polytetrafluoroethylene micro powder comprises the following raw materials in percentage by mass: 95-99.9% of polytetrafluoroethylene micro powder and 0.1-5% of N- (benzocyclobutene-4-yl) maleimide.
Preferably, the polypropylene modified material also comprises 0.5-15% of modified glass fiber in percentage by mass, and the modified glass fiber is prepared by modifying the glass fiber by adopting a silane coupling agent in a dry method. The addition of the glass fiber can improve the hardness, mechanical strength and wear resistance of the polypropylene material, but the glass fiber is not melted in a polypropylene system, so that the silane coupling agent is adopted to modify the glass fiber by a dry method, and the obtained modified glass fiber can be melted in the polypropylene material while the hardness, mechanical strength and wear resistance of the polypropylene material are greatly improved, and the compatibility between the two is higher.
Preferably, in the polypropylene modified material, the preparation method of the modified glass fiber comprises the following steps: preparing the silane coupling agent into a solution, spraying the solution on glass fibers, and then placing the glass fibers at the temperature of 60-150 ℃ for bridging for 0.5-5 hours to obtain the modified glass fibers;
the modified glass fiber comprises the following raw materials in percentage by mass: 97-99.9% of glass fiber and 0.1-3% of silane coupling agent.
Preferably, the polypropylene modified material comprises the following raw materials in percentage by mass: 3.5-8% of modified magnesium hydroxide, 5-10% of modified glass fiber, 3-7% of polytetrafluoroethylene micro powder, and the balance of polypropylene.
The invention also provides a preparation method of the polypropylene modified material, which comprises the following steps:
(1) uniformly mixing the raw materials according to a preset mass percentage, then drying the mixture for 4 to 12 hours at a temperature of between 70 and 110 ℃, and cooling the mixture for later use;
the drying aims at removing moisture and low molecular substances in the raw material mixture, cooling the raw material mixture after drying is finished, and placing the raw material mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into an extruder, blending at the temperature of 250 ℃ and 280 ℃, extruding and granulating to obtain the polypropylene modified material.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the polypropylene modified material, the silane coupling agent is adopted to carry out dry modification on the magnesium hydroxide to prepare the modified magnesium hydroxide, so that the modified magnesium hydroxide has the advantages of simple components, convenient manufacture, good flame retardance, uniform dispersion in the polypropylene material, high compatibility and capability of improving the mechanical strength of the polypropylene material; the added polytetrafluoroethylene micro powder can not only synergistically enhance the anti-dripping performance of the polypropylene material with the modified magnesium hydroxide, but also reduce the friction coefficient of the polypropylene material, so that the polypropylene material is more wear-resistant.
(2) The polytetrafluoroethylene micro powder adopted in the invention is modified polytetrafluoroethylene micro powder, the modified polytetrafluoroethylene micro powder is obtained by grafting the polytetrafluoroethylene micro powder subjected to plasma treatment and N- (benzocyclobutene-4-yl) maleimide under ultraviolet irradiation, and compared with the polytetrafluoroethylene micro powder, the modified polytetrafluoroethylene micro powder has higher compatibility with polypropylene.
(3) The polypropylene modified material also contains modified glass fiber, and the modified glass fiber is prepared by modifying the glass fiber by adopting a silane coupling agent in a dry method; the addition of the glass fiber can improve the hardness, mechanical strength and wear resistance of the polypropylene material, but the glass fiber is not melted in a polypropylene system, so that the silane coupling agent is adopted to modify the glass fiber by a dry method, and the obtained modified glass fiber can be melted in the polypropylene material while the hardness, mechanical strength and wear resistance of the polypropylene material are greatly improved, and the compatibility between the two is higher.
Detailed Description
The technical means of the present invention will be described in further detail below with reference to specific embodiments.
Example 1
The polypropylene modified material comprises the following raw materials in percentage by mass: 6% of modified magnesium hydroxide, 7% of modified glass fiber, 5% of modified polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of magnesium hydroxide was spread in a pan and the solution was sprayed on the magnesium hydroxide; the discs were then placed in an oven and bridged at 100 ℃ for 2h to obtain the modified magnesium hydroxide of this example.
The preparation method of the modified glass fiber comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of glass fiber is spread in a plate, and the solution is sprayed on the glass fiber; the tray was then placed in an oven and bridged at 100 ℃ for 2h to obtain the modified glass fiber of this example.
The preparation method of the modified polytetrafluoroethylene micro powder comprises the following steps: taking 1000g of polytetrafluoroethylene micro powder, and carrying out plasma treatment on the polytetrafluoroethylene micro powder under the atmosphere of helium, wherein the treatment power is 100W, and the treatment time is 90 s; placing the polytetrafluoroethylene micro powder subjected to plasma treatment in a reactor, introducing nitrogen into the reactor to discharge oxygen, and introducing a mixed solution of anhydrous tetrahydrofuran and N- (benzocyclobutene-4-yl) maleimide (5g) into the reactor after the oxygen is exhausted, wherein the introduction amount of the mixed solution is based on the immersion of the polytetrafluoroethylene micro powder;
and after the introduction of the mixed solution is finished, opening an ultraviolet lamp of the reactor, allowing the polytetrafluoroethylene micro powder and the mixed solution to react for 1h under the irradiation of ultraviolet light with the wavelength of 365nm, taking out, washing with deionized water for at least three times, and naturally drying to obtain the modified polytetrafluoroethylene micro powder.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the modified glass fiber, the modified polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to the preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 8 hours to remove moisture and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Example 2
The polypropylene modified material comprises the following raw materials in percentage by mass: 3.5 percent of modified magnesium hydroxide, 10 percent of modified glass fiber, 7 percent of modified polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of magnesium hydroxide was spread in a pan and the solution was sprayed on the magnesium hydroxide; the discs were then placed in an oven and bridged at 60 ℃ for 5h to obtain the modified magnesium hydroxide of this example.
The preparation method of the modified glass fiber comprises the following steps: preparing 30g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; placing 970g of glass fiber in a pan, and spraying the solution on the glass fiber; the tray was then placed in an oven and bridged for 5h at 60 ℃ to obtain the modified glass fiber of this example.
The preparation method of the modified polytetrafluoroethylene micro powder comprises the following steps: taking 1000g of polytetrafluoroethylene micro powder, and carrying out plasma treatment on the polytetrafluoroethylene micro powder under the atmosphere of helium, wherein the treatment power is 100W, and the treatment time is 90 s; placing the polytetrafluoroethylene micro powder subjected to plasma treatment in a reactor, introducing nitrogen into the reactor to discharge oxygen, and introducing a mixed solution of anhydrous tetrahydrofuran and N- (benzocyclobutene-4-yl) maleimide (5g) into the reactor after the oxygen is exhausted, wherein the introduction amount of the mixed solution is based on the immersion of the polytetrafluoroethylene micro powder;
and after the introduction of the mixed solution is finished, opening an ultraviolet lamp of the reactor, allowing the polytetrafluoroethylene micro powder and the mixed solution to react for 1h under the irradiation of ultraviolet light with the wavelength of 365nm, taking out, washing with deionized water for at least three times, and naturally drying to obtain the modified polytetrafluoroethylene micro powder.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the modified glass fiber, the modified polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to the preset mass percentage, uniformly mixing, then placing the mixture into an oven at 70 ℃ for drying for 12 hours to remove moisture and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 250 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Example 3
The polypropylene modified material comprises the following raw materials in percentage by mass: 8% of modified magnesium hydroxide, 5% of modified glass fiber, 3% of modified polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 1g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; spreading 999g of magnesium hydroxide in a pan, and spraying the solution on the magnesium hydroxide; the disc was then placed in an oven and bridged at 150 ℃ for 0.5h to obtain the modified magnesium hydroxide of this example.
The preparation method of the modified glass fiber comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of glass fiber is spread in a plate, and the solution is sprayed on the glass fiber; the tray was then placed in an oven and bridged at 150 ℃ for 0.5h to obtain the modified glass fiber of this example.
The preparation method of the modified polytetrafluoroethylene micro powder comprises the following steps: taking 1000g of polytetrafluoroethylene micro powder, and carrying out plasma treatment on the polytetrafluoroethylene micro powder under the atmosphere of helium, wherein the treatment power is 100W, and the treatment time is 90 s; placing the polytetrafluoroethylene micro powder subjected to plasma treatment in a reactor, introducing nitrogen into the reactor to discharge oxygen, and introducing a mixed solution of anhydrous tetrahydrofuran and N- (benzocyclobutene-4-yl) maleimide (5g) into the reactor after the oxygen is exhausted, wherein the introduction amount of the mixed solution is based on the immersion of the polytetrafluoroethylene micro powder;
and after the introduction of the mixed solution is finished, opening an ultraviolet lamp of the reactor, allowing the polytetrafluoroethylene micro powder and the mixed solution to react for 1h under the irradiation of ultraviolet light with the wavelength of 365nm, taking out, washing with deionized water for at least three times, and naturally drying to obtain the modified polytetrafluoroethylene micro powder.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the modified glass fiber, the modified polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to the preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 110 ℃ for baking for 4 hours to remove moisture and low molecular substances, cooling after baking, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 280 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Example 4
The polypropylene modified material comprises the following raw materials in percentage by mass: 15% of modified magnesium hydroxide, 15% of modified glass fiber, 10% of modified polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of magnesium hydroxide was spread in a pan and the solution was sprayed on the magnesium hydroxide; the discs were then placed in an oven and bridged at 80 ℃ for 2h to obtain the modified magnesium hydroxide of this example.
The preparation method of the modified glass fiber comprises the following steps: preparing 1g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; spreading 999g of glass fiber in a plate, and spraying the solution on the glass fiber; the tray was then placed in an oven and bridged at 80 ℃ for 2h to obtain the modified glass fiber of this example.
The preparation method of the modified polytetrafluoroethylene micro powder comprises the following steps: taking 1000g of polytetrafluoroethylene micro powder, and carrying out plasma treatment on the polytetrafluoroethylene micro powder under the atmosphere of helium, wherein the treatment power is 100W, and the treatment time is 90 s; placing the polytetrafluoroethylene micro powder subjected to plasma treatment in a reactor, introducing nitrogen into the reactor to discharge oxygen, and introducing a mixed solution of anhydrous tetrahydrofuran and N- (benzocyclobutene-4-yl) maleimide (5g) into the reactor after the oxygen is exhausted, wherein the introduction amount of the mixed solution is based on the immersion of the polytetrafluoroethylene micro powder;
and after the introduction of the mixed solution is finished, opening an ultraviolet lamp of the reactor, allowing the polytetrafluoroethylene micro powder and the mixed solution to react for 1h under the irradiation of ultraviolet light with the wavelength of 365nm, taking out, washing with deionized water for at least three times, and naturally drying to obtain the modified polytetrafluoroethylene micro powder.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the modified glass fiber, the modified polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to the preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 3 hours to remove moisture and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Example 5
The polypropylene modified material comprises the following raw materials in percentage by mass: 15 percent of modified magnesium hydroxide, 0.5 percent of modified glass fiber, 0.05 percent of modified polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of magnesium hydroxide was spread in a pan and the solution was sprayed on the magnesium hydroxide; the discs were then placed in an oven and bridged at 80 ℃ for 2h to obtain the modified magnesium hydroxide of this example.
The preparation method of the modified glass fiber comprises the following steps: preparing 30g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; placing 970g of glass fiber in a pan, and spraying the solution on the glass fiber; the tray was then placed in an oven and bridged at 80 ℃ for 2h to obtain the modified glass fiber of this example.
The preparation method of the modified polytetrafluoroethylene micro powder comprises the following steps: taking 1000g of polytetrafluoroethylene micro powder, and carrying out plasma treatment on the polytetrafluoroethylene micro powder under the atmosphere of helium, wherein the treatment power is 100W, and the treatment time is 90 s; placing the polytetrafluoroethylene micro powder subjected to plasma treatment in a reactor, introducing nitrogen into the reactor to discharge oxygen, and introducing a mixed solution of anhydrous tetrahydrofuran and N- (benzocyclobutene-4-yl) maleimide (5g) into the reactor after the oxygen is exhausted, wherein the introduction amount of the mixed solution is based on the immersion of the polytetrafluoroethylene micro powder;
and after the introduction of the mixed solution is finished, opening an ultraviolet lamp of the reactor, allowing the polytetrafluoroethylene micro powder and the mixed solution to react for 1h under the irradiation of ultraviolet light with the wavelength of 365nm, taking out, washing with deionized water for at least three times, and naturally drying to obtain the modified polytetrafluoroethylene micro powder.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the modified glass fiber, the modified polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to the preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 3 hours to remove moisture and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Example 6
The polypropylene modified material comprises the following raw materials in percentage by mass: 6 percent of modified magnesium hydroxide, 5 percent of modified polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of magnesium hydroxide was spread in a pan and the solution was sprayed on the magnesium hydroxide; the discs were then placed in an oven and bridged at 100 ℃ for 2h to obtain the modified magnesium hydroxide of this example.
The preparation method of the modified polytetrafluoroethylene micro powder comprises the following steps: taking 1000g of polytetrafluoroethylene micro powder, and carrying out plasma treatment on the polytetrafluoroethylene micro powder under the atmosphere of helium, wherein the treatment power is 100W, and the treatment time is 90 s; placing the polytetrafluoroethylene micro powder subjected to plasma treatment in a reactor, introducing nitrogen into the reactor to discharge oxygen, and introducing a mixed solution of anhydrous tetrahydrofuran and N- (benzocyclobutene-4-yl) maleimide (5g) into the reactor after the oxygen is exhausted, wherein the introduction amount of the mixed solution is based on the immersion of the polytetrafluoroethylene micro powder;
and after the introduction of the mixed solution is finished, opening an ultraviolet lamp of the reactor, allowing the polytetrafluoroethylene micro powder and the mixed solution to react for 1h under the irradiation of ultraviolet light with the wavelength of 365nm, taking out, washing with deionized water for at least three times, and naturally drying to obtain the modified polytetrafluoroethylene micro powder.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the modified polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to the preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 8 hours to remove water and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Example 7
The polypropylene modified material comprises the following raw materials in percentage by mass: 15% of modified magnesium hydroxide, 5% of polytetrafluoroethylene micro powder and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; spreading 1000g of magnesium hydroxide in a pan, and spraying the solution on the magnesium hydroxide; the discs were then placed in an oven and bridged at 100 ℃ for 2h to obtain the modified magnesium hydroxide of this example.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to a preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 8 hours to remove water and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Comparative example 1
The polypropylene modified material comprises the following raw materials in percentage by mass: 15% of modified magnesium hydroxide, and the balance of polypropylene;
the preparation method of the modified magnesium hydroxide comprises the following steps: preparing 10g of silane coupling agent into a solution with the volume fraction of 20% by using absolute ethyl alcohol; 990g of magnesium hydroxide was spread in a pan and the solution was sprayed on the magnesium hydroxide; the discs were then placed in an oven and bridged at 100 ℃ for 2h to obtain the modified magnesium hydroxide of this example.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to a preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 8 hours to remove water and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
Comparative example 2
The polypropylene modified material comprises the following raw materials in percentage by mass: 15% magnesium hydroxide, the remainder being polypropylene.
The preparation method of the polypropylene modified material of the embodiment comprises the following steps:
(1) putting the modified magnesium hydroxide, the polytetrafluoroethylene micro powder and the polypropylene into a high-speed mixer according to a preset mass percentage, uniformly mixing, then placing the mixture into an oven at the temperature of 80 ℃ for drying for 8 hours to remove water and low molecular substances, cooling after drying, and placing the mixture into a turnover box to keep a dry state for later use;
(2) and (2) feeding the mixture obtained in the step (1) into a screw extruder, blending at 260 ℃, extruding and granulating to obtain the polypropylene modified material of the embodiment.
The polypropylene modified materials prepared in examples 1-7 and comparative examples 1-2 were tested for various properties, and the test results are shown in tables 1 and 2.
TABLE 1
| Test items | Tensile strength | Bending strength | Density of |
| Test standard | GB/T1040.2-2006 | GB/T9341-2008 | GB/T 1033.1-2008 |
| Example 1 | 31.5MPa | 29.5MPa | 1.20g/cm3 |
| Example 2 | 28.1MPa | 26.3MPa | 1.02g/cm3 |
| Example 3 | 28.3MPa | 26.4MPa | 1.03g/cm3 |
| Example 4 | 27.9MPa | 26.1MPa | 1.01g/cm3 |
| Example 5 | 27.5MPa | 25.9MPa | 1.00g/cm3 |
| Example 6 | 22.1MPa | 21.3MPa | 0.99g/cm3 |
| Example 7 | 20.3MPa | 18.7MPa | 0.96g/cm3 |
| Comparative example 1 | 17.7MPa | 16.2MPa | 0.89g/cm3 |
| Comparative example 2 | 15.3MPa | 14.7MPa | 0.86g/cm3 |
TABLE 2
| Test items | Oxygen index | Amount of wear | Melt index |
| Test standard | GB/T2406.2-2009 | ASTM 4060-2014 | ASTM-D-1238 |
| Example 1 | 27.2％ | 143.8mg | 1.12g/min |
| Example 2 | 23.7％ | 147.6mg | 1.14g/min |
| Example 3 | 23.2％ | 147.9mg | 1.15g/min |
| Example 4 | 22.0％ | 152.3mg | 1.14g/min |
| Example 5 | 21.7％ | 153.1mg | 1.16g/min |
| Example 6 | 21.1％ | 159.4mg | 1.16g/min |
| Example 7 | 20.8％ | 164.8mg | 1.73g/min |
| Comparative example 1 | 18.8％ | 192.6mg | 3.37g/min |
| Comparative example 2 | 18.2％ | 214.8mg | 3.92g/min |
Claims (10)
1. The polypropylene modified material is characterized by comprising the following raw materials in percentage by mass: 0.5-15% of modified magnesium hydroxide, 0.05-10% of polytetrafluoroethylene micro powder and the balance of polypropylene;
the modified magnesium hydroxide is prepared by dry modification of magnesium hydroxide by adopting a silane coupling agent.
2. The polypropylene modified material of claim 1, wherein the modified magnesium hydroxide comprises the following raw materials in percentage by mass: 97-99.9% of magnesium hydroxide and 0.1-3% of silane coupling agent.
3. The polypropylene modified material of claim 1, wherein the modified magnesium hydroxide is prepared by a process comprising: preparing the silane coupling agent into a solution, spraying the solution on magnesium hydroxide, and then placing the solution at the temperature of 60-150 ℃ for bridging for 0.5-5 h to obtain the modified magnesium hydroxide.
4. The polypropylene modified material according to any one of claims 1 to 3, wherein the silane coupling agent is KH 550.
5. The polypropylene modified material according to any one of claims 1 to 3, wherein the polytetrafluoroethylene fine powder is modified polytetrafluoroethylene fine powder obtained by grafting plasma-treated polytetrafluoroethylene fine powder with N- (benzocyclobutene-4-yl) maleimide under ultraviolet irradiation.
6. The polypropylene modified material according to claim 5, wherein the modified polytetrafluoroethylene micro powder is obtained by graft polymerization of plasma-treated polytetrafluoroethylene micro powder and N- (benzocyclobutene-4-yl) maleimide under 200-400 nm ultraviolet irradiation for 2-120 min.
7. The polypropylene modified material of claim 5, wherein the modified polytetrafluoroethylene micropowder comprises the following raw materials in percentage by mass: 95-99.9% of polytetrafluoroethylene micro powder and 0.1-5% of N- (benzocyclobutene-4-yl) maleimide.
8. The polypropylene modified material according to any one of claims 1 to 3 and 6 to 7, further comprising 0.5 to 15 mass% of modified glass fiber, wherein the modified glass fiber is prepared by dry modification of glass fiber with a silane coupling agent.
9. The polypropylene modified material of claim 8, wherein the preparation method of the modified glass fiber comprises the following steps: preparing the silane coupling agent into a solution, spraying the solution on glass fibers, and then placing the glass fibers at the temperature of 60-150 ℃ for bridging for 0.5-5 hours to obtain the modified glass fibers;
the modified glass fiber comprises the following raw materials in percentage by mass: 97-99.9% of glass fiber and 0.1-3% of silane coupling agent.
10. The process for the preparation of polypropylene modified material according to any one of claims 1 to 9, comprising the steps of:
(1) uniformly mixing the raw materials according to a preset mass percentage, then drying the mixture for 4 to 12 hours at a temperature of between 70 and 110 ℃, and cooling the mixture for later use;
(2) and (2) feeding the mixture obtained in the step (1) into an extruder, blending at the temperature of 250 ℃ and 280 ℃, extruding and granulating to obtain the polypropylene modified material.
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