CN107304268B - Flame-retardant polyolefin compound and preparation method thereof - Google Patents
Flame-retardant polyolefin compound and preparation method thereof Download PDFInfo
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- C08K3/32—Phosphorus-containing compounds
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/25—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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- C08K5/00—Use of organic ingredients
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- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
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- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08K2003/323—Ammonium polyphosphate
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention provides a preparation method of a flame-retardant polyolefin compound, which comprises the following steps: (a) weighing 70-120 parts by weight of polyolefin and 15-100 parts by weight of intumescent flame retardant; (b) dry-mixing the polyolefin and the intumescent flame retardant to obtain a dry mixture, adding the dry mixture into a first extruder, and performing melt extrusion to obtain a premix; (c) and adding the premix into a second extruder, introducing supercritical carbon dioxide into 1/5-1/3 of a screw of the second extruder, and performing melt extrusion to obtain the flame-retardant polyolefin compound. The invention adopts supercritical carbon dioxide to promote the intumescent flame retardant to be uniformly dispersed in the polyolefin, thereby obtaining the flame-retardant polyolefin compound with excellent flame-retardant property. The invention also provides a flame-retardant polyolefin compound.
Description
Technical Field
The invention relates to the technical field of flame-retardant high polymer materials, in particular to a flame-retardant polyolefin compound and a preparation method thereof.
Background
The polyolefin material has the advantages of rich raw materials, low price, easy processing and forming, excellent comprehensive performance and the like, is widely applied to the fields of agriculture, machinery, electronics, packaging, automobiles, building materials and the like, but is flammable and poor in flame retardant property, so that flame retardant treatment is needed when the polyolefin material is applied to various occasions. At present, the flame retardance of polyolefin is mainly realized by adding various flame retardants, and although the traditional halogen-containing flame retardants have good flame retardance, a large amount of smoke and toxic gas are easily generated in the production and use processes, and secondary pollution is generated, so that the research and development of halogen-free flame-retardant polyolefin composite materials are particularly important.
The intumescent flame retardant taking phosphorus and nitrogen as flame retardant elements is one of the common flame retardant systems of polyolefin, and mainly comprises the following components: catalyst (acid source), carbonizing agent (carbon source), and expanding agent (gas source). When the flame-retardant agent is burnt, a fluffy and porous carbon foam layer is formed on the surface of the polymer by the intumescent flame retardant agent, and the isolation layer can isolate oxygen and prevent heat transfer, thereby playing a flame-retardant role.
However, the existing intumescent flame retardants have poor compatibility with polyolefins and are difficult to disperse uniformly in the matrix polymer. In addition, in order to achieve a good flame retardant effect, a large amount of flame retardant is usually required to be added, which seriously affects the mechanical properties of the composite material, and thus the use of phosphorus-nitrogen intumescent flame retardants is limited to a certain extent. For example, chinese patent application publication No. CN10134830A discloses that the addition amount of intumescent flame retardant in polypropylene is up to 50%. In order to improve the flame retardant property and reduce the addition of the flame retardant, the intumescent flame retardant is usually required to be compounded with other additives, such as hydrotalcite, montmorillonite, titanium dioxide and the like. However, hydrotalcite, montmorillonite, etc. are also poor in compatibility with polyolefin and difficult to disperse uniformly, and thus surface modification treatment is usually required. However, since modification of hydrotalcite, montmorillonite, etc. usually needs to be carried out in organic solvent such as toluene, etc., it has the disadvantages of low grafting ratio and complex operation, and the organic solvent has the problems of easy volatilization, environmental pollution, harm to human body, etc. in the using process.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a flame-retardant polyolefin compound with good dispersion effect, high flame-retardant efficiency, high production efficiency, simple operation, high efficiency, environmental protection and a preparation method thereof, so as to solve the problems in the prior art.
The invention provides a preparation method of a flame-retardant polyolefin compound, which comprises the following steps:
(a) weighing 70-120 parts by weight of polyolefin and 15-100 parts by weight of intumescent flame retardant;
(b) dry-mixing the polyolefin and the intumescent flame retardant to obtain a dry mixture, adding the dry mixture into a first extruder, and performing melt extrusion to obtain a premix;
(c) and adding the premix into a second extruder, introducing supercritical carbon dioxide into 1/5-1/3 of a screw of the second extruder, and performing melt extrusion to obtain the flame-retardant polyolefin compound.
Preferably, the polyolefin in step (a) is at least one of polyethylene, polypropylene, ethylene-propylene rubber, ethylene-vinyl acetate copolymer and ethylene-octene copolymer.
Preferably, the intumescent flame retardant in the step (a) is prepared from an acid source, a carbon source and a gas source according to the following formula (2-4): (0-1): (0-1), wherein the acid source is at least one of ammonium polyphosphate, melamine polyphosphate, ammonium dihydrogen phosphate, hypophosphite, cyanuric acid, tricresyl phosphate, alkyl phosphate and phosphonate, the carbon source is at least one of starch, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, phenolic resin and cyclodextrin, and the gas source is at least one of dicyandiamide, melamine, urea and urea-formaldehyde resin.
Preferably, the mass ratio of the intumescent flame retardant in step (a) is 15-45% of the total mass of the dry mixture.
Preferably, the mass of the carbon dioxide in the supercritical state in step (c) is 1 to 20% of the total mass of the premix.
Preferably, in step (c), carbon dioxide in a supercritical state is introduced at 1/4 of the screw of the second extruder.
Preferably, in the step (c), the temperature of the first half area of the screw of the second extruder is 170-210 ℃, and the temperature of the second half area of the screw is 160-220 ℃.
Preferably, the injection pressure of the supercritical carbon dioxide in the step (c) is 7 to 30 MPa.
The invention also provides a flame-retardant polyolefin compound obtained by the preparation method, wherein the flame-retardant polyolefin compound comprises an intumescent flame retardant and polyolefin, and the intumescent flame retardant is uniformly dispersed in the polyolefin.
Compared with the traditional intumescent flame retardant adding process, the problems of uneven dispersion of the flame retardant, large addition amount, low flame retardant efficiency, damage to mechanical properties and the like exist, when the polyolefin in the flame-retardant polyolefin compound is heated at high temperature, a carbon source in the intumescent flame retardant is dehydrated into carbon under the action of the acid source, and a fluffy and porous carbon layer is formed under the action of gas generated by decomposition of the acid source. The formed char layer may attenuate heat transfer between the polyolefin and the heat source and inhibit gas diffusion. In addition, the non-combustible gas such as ammonia gas formed by the thermal decomposition of the intumescent flame retardant also plays a role in diluting the combustible gas, thereby preventing the propagation of flame, preventing the polyolefin from further degradation and combustion and obtaining good flame retardant effect.
Compared with the prior art, the preparation method disclosed by the invention has the advantages that the supercritical carbon dioxide is introduced into the 1/5-1/3 positions of the screw, and the viscosity of the polyolefin melt can be obviously reduced by utilizing the strong plasticizing capacity and diffusion capacity of the supercritical carbon dioxide. On one hand, the actual processing temperature can be greatly reduced, so that the decomposition of substances such as acid source ammonium polyphosphate and the like and carbon source pentaerythritol and the like in the processing process can be effectively inhibited, and the problem that the decomposition temperature of the flame retardant is lower than the processing temperature of the polymer in the prior art is effectively solved. On the other hand, the carbon dioxide in a supercritical state is used as a processing medium, so that the viscosity of the polymer melt can be reduced, and the dispersion of the flame retardant is facilitated; meanwhile, the interfacial tension of the intumescent flame retardant and the polyolefin can be remarkably reduced, so that the contact probability of the intumescent flame retardant and the polyolefin is increased, the dispersing capability of the intumescent flame retardant in the polyolefin is remarkably enhanced, the problems of agglomeration, uneven dispersion and the like of the intumescent flame retardant are effectively solved, and the flame retardant efficiency and the mechanical property of the flame-retardant polyolefin compound are improved. The preparation method also has the advantages of environmental protection, low energy consumption and high production efficiency, and the obtained flame-retardant polyolefin compound is also improved in the aspects of color, mechanical property and the like.
Drawings
FIG. 1 is a scanning electron micrograph of a flame retardant polypropylene composite prepared in example 1 of the present invention.
Fig. 2 is a scanning electron micrograph of the flame retardant polypropylene composite prepared in comparative example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a preparation method of a flame-retardant polyolefin compound, which comprises the following steps:
(a) weighing 70-120 parts by weight of polyolefin and 15-100 parts by weight of intumescent flame retardant;
(b) mixing the polyolefin and the intumescent flame retardant to obtain a dry mixture, adding the dry mixture into a first extruder, and performing melt extrusion to obtain a premix;
(c) and adding the premix into a second extruder, and introducing supercritical carbon dioxide into 1/5-1/3 positions of a screw of the second extruder to extrude the mixture to obtain the efficient halogen-free flame-retardant polyolefin composite material.
In the step (a), the polyolefin is at least one of polyethylene, polypropylene, ethylene-propylene rubber, ethylene-vinyl acetate copolymer and ethylene-octene copolymer. The intumescent flame retardant is prepared from an acid source, a carbon source and a gas source according to the weight ratio of (2-4): (0-1): (0 to 1) in a mass ratio. Preferably, the mass ratio of the added acid source, the added carbon source and the added gas source is 3:1:1, and the mass ratio of the polyolefin to the intumescent flame retardant is (70-120): (20-150).
The acid source in the intumescent flame retardant can be at least one of ammonium polyphosphate, melamine polyphosphate, ammonium dihydrogen phosphate, hypophosphite, cyanuric acid, tricresyl phosphate, alkyl phosphate and phosphonate. Preferably, the acid source is ammonium polyphosphate or melamine polyphosphate. The carbon source in the intumescent flame retardant can be at least one of starch, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, phenolic resin and cyclodextrin. Preferably, the carbon source is starch or pentaerythritol. The gas source in the intumescent flame retardant is at least one of dicyandiamide, melamine, urea and urea-formaldehyde resin. Preferably, the gas source is melamine.
In step (b), the polyolefin and the intumescent flame retardant may be mixed by a high speed mixer to obtain a dry blend, and then the dry blend is added into a first extruder through the feed port of the first extruder to be melt blended and extruded to obtain a pre-mixture. The first extruder may specifically be a twin-screw extruder. The temperature of the first extruder is 180-220 ℃.
In the step (c), adding the pre-mixture into a second extruder through a feed inlet of the second extruder, introducing supercritical carbon dioxide into a screw of the second extruder at 1/5-1/3, and performing melt extrusion to obtain the flame-retardant polyolefin compound. The mass of the supercritical carbon dioxide accounts for 1-20% of the total mass of the mixture. The injection pressure of the supercritical carbon dioxide is 7MPa to 30 MPa. The second extruder is a single-screw extruder which is built independently. The temperature of the front half area of the screw of the second extruder is 170-210 ℃, and the temperature of the rear half area of the screw is 160-220 ℃. The pressure in the second extruder is 7MPa to 30 MPa.
In order to ensure that the supercritical carbon dioxide and the premix have a good mixing effect, preferably, the supercritical carbon dioxide is introduced into 1/4 of a screw of a second extruder, the mass of the supercritical carbon dioxide accounts for 2-10% of the total mass of the mixture, the injection pressure of the supercritical carbon dioxide is 10-20 MPa, the temperature of the front half area of the second extruder is 180-200 ℃, the temperature of the rear half area of the screw is 180-210 ℃, and the pressure in the second extruder is 8-18 MPa.
Compared with the prior art, the preparation method disclosed by the invention has the advantages that the supercritical carbon dioxide is introduced into the 1/5-1/3 positions of the screw, and the viscosity of the polyolefin melt can be obviously reduced by utilizing the strong plasticizing capacity and diffusion capacity of the supercritical carbon dioxide. On one hand, the actual processing temperature can be greatly reduced, so that the decomposition of substances such as acid source ammonium polyphosphate and the like and carbon source pentaerythritol and the like in the processing process can be effectively inhibited, and the problem that the decomposition temperature of the flame retardant is lower than the processing temperature of the polymer in the prior art is effectively solved. On the other hand, the carbon dioxide in a supercritical state is used as a processing medium, so that the viscosity of the polymer melt can be reduced, and the dispersion of the flame retardant is facilitated; meanwhile, the interfacial tension of the intumescent flame retardant and the polyolefin can be remarkably reduced, so that the contact probability of the intumescent flame retardant and the polyolefin is increased, the dispersing capability of the intumescent flame retardant in the polyolefin is remarkably enhanced, the problems of agglomeration, uneven dispersion and the like of the intumescent flame retardant are effectively solved, and the flame retardant efficiency and the mechanical property of the flame-retardant polyolefin compound are improved. The preparation method also has the advantages of environmental protection, low energy consumption and high production efficiency, and the obtained flame-retardant polyolefin compound is also improved in the aspects of color, mechanical property and the like.
The invention also provides the flame-retardant polyolefin compound prepared by the preparation method. The flame-retardant polyolefin compound comprises an intumescent flame retardant and polyolefin, wherein the intumescent flame retardant is uniformly dispersed in the polyolefin.
Compared with the traditional intumescent flame retardant adding process, the problems of uneven dispersion of the flame retardant, large addition amount, low flame retardant efficiency, damage to mechanical properties and the like exist, when the polyolefin in the flame-retardant polyolefin compound is heated at high temperature, a carbon source in the intumescent flame retardant is dehydrated into carbon under the action of the acid source, and a fluffy and porous carbon layer is formed under the action of gas generated by decomposition of the acid source. The formed char layer may attenuate heat transfer between the polyolefin and the heat source and inhibit gas diffusion. In addition, the non-combustible gas such as ammonia gas formed by the thermal decomposition of the intumescent flame retardant also plays a role in diluting the combustible gas, thereby preventing the propagation of flame, preventing the polyolefin from further degradation and combustion and obtaining good flame retardant effect.
The flame retardant polyolefin composite material and the preparation method thereof according to the present invention will be described with reference to specific examples below:
example 1:
weighing about 80 parts by weight of polypropylene, 23 parts by weight of ammonium polyphosphate and 6 parts by weight of pentaerythritol.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set to be 200 ℃, and the temperature of the rear half area of the screw is set to be 185 ℃; about 5 parts by weight of carbon dioxide in a supercritical state was injected at 1/4 point of the screw, and the injection pressure was set to 18 MPa; and (4) maintaining the pressure in the second extruder at 10MPa, and extruding and granulating to obtain the flame-retardant polypropylene compound.
Example 2:
about 90 parts by weight of polypropylene, 30 parts by weight of ethylene-octene copolymer, 30 parts by weight of melamine polyphosphate and 6 parts by weight of starch were weighed.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set as 195 ℃, and the temperature of the rear half area of the screw is set as 190 ℃; about 6 parts by weight of carbon dioxide in a supercritical state was injected at 1/4 point of the screw, and the injection pressure was set to 16 MPa; and (3) maintaining the pressure in the second extruder at 12MPa, and extruding and granulating to obtain the flame-retardant polypropylene/ethylene-octene copolymer compound.
Example 3:
weighing about 110 parts by weight of polyethylene, 25 parts by weight of ammonium polyphosphate, 6 parts by weight of pentaerythritol and 6 parts by weight of melamine.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set to be 200 ℃, and the temperature of the rear half area of the screw is set to be 180 ℃; about 10 parts by weight of carbon dioxide in a supercritical state was injected at 1/4 point of the screw, and the injection pressure was set to 15 MPa; and (4) maintaining the pressure in the second extruder at 9MPa, and extruding and granulating to obtain the flame-retardant polyethylene compound.
Example 4:
about 100 parts by weight of ethylene-vinyl acetate copolymer EVA, 26 parts by weight of melamine phosphate and 12 parts by weight of pentaerythritol were weighed.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set to be 210 ℃, and the temperature of the rear half area of the screw is set to be 200 ℃; about 7 parts by weight of carbon dioxide in a supercritical state was injected at 1/4 points of the screw, and the injection pressure was set to 20 MPa; and (4) maintaining the pressure in the second extruder at 8MPa, and extruding and granulating to obtain the flame-retardant ethylene-vinyl acetate copolymer compound.
Example 5:
about 80 parts by weight of polypropylene, 25 parts by weight of ethylene-propylene rubber, 30 parts by weight of tricresyl phosphate and 10 parts by weight of dipentaerythritol were weighed.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set as 190 ℃, and the temperature of the rear half area of the screw is set as 205 ℃; about 5 parts by weight of carbon dioxide in a supercritical state was injected at 1/4 point of the screw, and the injection pressure was set to 18 MPa; and (4) maintaining the pressure in the second extruder at 8MPa, and extruding and granulating to obtain the flame-retardant polypropylene/ethylene propylene rubber compound.
Comparative example 1:
weighing about 80 parts by weight of polypropylene, 23 parts by weight of ammonium polyphosphate and 6 parts by weight of pentaerythritol.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set to be 200 ℃, and the temperature of the rear half area of the screw is set to be 185 ℃; closing a supercritical carbon dioxide inlet at 1/4 of the screw, and directly extruding and granulating by a second extruder to obtain the flame-retardant polypropylene compound.
Comparative example 2:
about 90 parts by weight of polypropylene, 30 parts by weight of ethylene-octene copolymer, 30 parts by weight of melamine phosphate and 6 parts by weight of starch were weighed.
The raw materials are mixed by a high-speed mixer and then added into a first extruder, and the mixture is melted and extruded to obtain a premix.
Adding the premix to a second extruder; wherein the temperature of the front half area of the screw is set as 195 ℃, and the temperature of the rear half area of the screw is set as 190 ℃; closing a supercritical carbon dioxide inlet at 1/4 of the screw, and directly extruding and granulating by a second extruder to obtain the flame-retardant polypropylene/ethylene-octene copolymer composite.
The products obtained in examples 1 to 5 and comparative examples 1 and 2 were characterized by their micro-distribution, flame retardancy and mechanical properties, and the results are shown in table 1. Wherein, the microscopic distribution characterization: adopting a ZEISS scanning electron microscope; and (3) flame retardant performance characterization: a VOUCH5801A oxygen index tester and a VOUCH 5402 vertical horizontal UL-94 combustion tester are adopted; and (3) mechanical property characterization: an INSTRON universal testing machine and a cantilever beam impact strength testing machine are adopted.
TABLE 1
As can be seen from Table 1, the flame retardant polyolefin composites obtained in examples 1 to 5 are superior in flame retardancy, high in oxygen index, and capable of passing the V-0 rating of UL-94, and improved in tensile strength and notched impact strength, as compared to comparative examples 1 and 2. The flame-retardant polyolefin compound prepared by the preparation method has excellent flame-retardant property and mechanical property and is beneficial to industrial application.
As can be seen from fig. 1 and 2, the intumescent flame retardant of the flame retardant polyolefin compound obtained in example 1 is uniformly distributed in the polyolefin, while the agglomeration phenomenon of the intumescent flame retardant in comparative example 1 is severe.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method of preparing a flame retardant polyolefin compound comprising the steps of:
(a) weighing 70-120 parts by weight of polyolefin and 15-100 parts by weight of intumescent flame retardant;
(b) dry-mixing the polyolefin and the intumescent flame retardant to obtain a dry mixture, adding the dry mixture into a first extruder, and performing melt extrusion to obtain a premix;
(c) and adding the premix into a second extruder, wherein the temperature of the front half area of a screw of the second extruder is 180-200 ℃, the temperature of the rear half area of the screw is 180-210 ℃, introducing supercritical carbon dioxide at 1/4 of the screw of the second extruder, the mass of the supercritical carbon dioxide accounts for 2-10% of the total mass of the premix, and performing melt extrusion to obtain the flame-retardant polyolefin compound.
2. A method of preparing a flame retardant polyolefin compound according to claim 1 wherein in step (a) the polyolefin is at least one of polyethylene, polypropylene, ethylene-propylene rubber, ethylene-octene copolymer.
3. The preparation method of the flame-retardant polyolefin compound according to claim 1, wherein the intumescent flame retardant in the step (a) is prepared from an acid source, a carbon source and a gas source according to the following ratio of (2-4): (0-1): (0-1), wherein the acid source is at least one of ammonium polyphosphate, melamine polyphosphate, ammonium dihydrogen phosphate, hypophosphite, cyanuric acid, tricresyl phosphate, alkyl phosphate and phosphonate, the carbon source is at least one of starch, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, phenolic resin and cyclodextrin, and the gas source is at least one of dicyandiamide, melamine, urea and urea-formaldehyde resin.
4. A process for the preparation of a flame retardant polyolefin compound according to claim 1, wherein the mass ratio of the intumescent flame retardant in step (a) is between 15% and 45% of the total mass of the dry blend.
5. A method for preparing a flame retardant polyolefin compound according to claim 1, wherein the injection pressure of the supercritical carbon dioxide in step (c) is 7MPa to 30 MPa.
6. A flame-retardant polyolefin compound obtained by the preparation method according to any one of claims 1 to 5, wherein the flame-retardant polyolefin compound comprises an intumescent flame retardant and polyolefin, and the intumescent flame retardant is uniformly dispersed in the polyolefin.
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| CN107840996A (en) * | 2017-11-29 | 2018-03-27 | 西华大学 | A kind of expanding fire retardant and preparation method thereof |
| CN110128741B (en) * | 2018-02-09 | 2022-02-18 | 中国科学院宁波材料技术与工程研究所 | Polyolefin foam material and preparation method thereof |
| CN110054809B (en) * | 2019-04-18 | 2021-04-06 | 宁波一舟塑胶有限公司 | Composite flame retardant, preparation method thereof and application thereof in polypropylene |
| CN110437553A (en) * | 2019-07-11 | 2019-11-12 | 佛山市德联邦盛光电科技股份有限公司 | A kind of fire retardant polystyrene plate and its processing method |
| CN112440545A (en) * | 2020-11-25 | 2021-03-05 | 浙江金科复合材料科技有限公司 | Manufacturing process of halogen-free flame-retardant polyethylene plastic-wood-steel composite board |
| CN113583366B (en) * | 2021-07-14 | 2023-05-05 | 会通新材料(上海)有限公司 | High-temperature-resistant low-compression-deformation flame-retardant thermoplastic elastomer and preparation method thereof |
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| CN1709968A (en) * | 2005-07-05 | 2005-12-21 | 四川大学 | Halogon-free expansion flame-retarded polyolefin complex substance |
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