CN110066443B - Halogen-free flame-retardant polyethylene material and preparation method and application thereof - Google Patents
Halogen-free flame-retardant polyethylene material and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a halogen-free flame-retardant polyethylene material and a preparation method and application thereof. The halogen-free flame-retardant polyethylene material comprises the following raw materials in parts by mass: 80-95 parts of LDPE; 5-15 parts of a halogen-free phosphate flame retardant; 1-5 parts of nitrogen flame retardant; 0.2-0.8 part of antioxidant; 0.1-0.5 parts of diffusion oil; 0.3-0.7 part of lubricant. Simultaneously, the preparation method of the halogen-free flame-retardant polyethylene material is also disclosed, and the application of the halogen-free flame-retardant polyethylene material is also disclosed. The halogen-free flame-retardant polyethylene material disclosed by the invention is excellent in flame-retardant and mechanical properties, good in flexibility of a workpiece, good in rebound resilience, environment-friendly and non-toxic, capable of being recycled repeatedly, and low in production cost, has the flame-retardant property of reaching UL94V-2, is good in self-extinguishing property, simple in preparation method and low in production cost, is easy to carry out industrial large-scale production, and is suitable for preparing simulated ornaments and plug inner films.
Description
Technical Field
The invention belongs to the technical field of flame-retardant materials, and particularly relates to a halogen-free flame-retardant polyethylene material as well as a preparation method and application thereof.
Background
Polyethylene (PE) has the advantages of no odor, no toxicity, excellent low-temperature resistance, good chemical stability, most acid and alkali resistance, small water absorption, excellent electrical insulation and the like, is widely applied to the fields of chemical industry, agriculture, building, packaging and the like, particularly the simulated PE ornament industry, has increasingly large requirements and increasingly strict requirements, and a plurality of products are promoted to meet the outdoor use requirement from meeting the indoor use requirement. The polyethylene material which has good weather resistance, no fading, stable flame retardant property and no halogen and is environment-friendly is the development trend in the future. However, the conventional halogen-free flame-retardant polyethylene generally uses ammonium polyphosphate and pentaerythritol as flame retardants, the addition amount of the flame retardants is 20-30%, the flame-retardant effect is good, but the mechanical property is seriously reduced, the fluidity is also greatly reduced, and the processing is difficult.
The artificial decorative products mainly comprise artificial green lawn, artificial Christmas tree, artificial branches and the like and plug inner membranes, and have low flame retardant requirements, but the artificial green lawn, the artificial Christmas tree, the artificial branches and the like need to have self-extinguishing property, cannot be ignited in a large range, have high environmental protection requirements on flame retardant, particularly antimony bromide, have clear service performance requirements, and have the advantages of bending resistance, difficult fracture, low hardness and no pricking. However, no polyethylene product capable of realizing the above performance meets the market requirements at present aiming at the halogen-free flame-retardant polyethylene material used in the simulated decoration industry and the plug inner film.
Disclosure of Invention
In order to overcome the problems in the prior art, one of the objects of the present invention is to provide a halogen-free flame retardant polyethylene material, the other object of the present invention is to provide a preparation method of the halogen-free flame retardant polyethylene material, and the third object of the present invention is to provide an application of the halogen-free flame retardant polyethylene material in artificial ornaments and plug inner films.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a halogen-free flame-retardant polyethylene material which comprises the following raw materials in parts by mass:
LDPE (low density polyethylene): 80-95 parts of a modifier;
halogen-free phosphate flame retardant: 5-15 parts of a solvent;
nitrogen-based flame retardant: 1-5 parts;
antioxidant: 0.2-0.8 part;
diffusion of oil: 0.1-0.5 part;
lubricant: 0.3 to 0.7 portion.
In the halogen-free flame-retardant polyethylene material, the preferred mass part of LDPE is 83-87 parts; the preferable mass portion of the halogen-free phosphate ester flame retardant is 9-12; the preferable using amount of the nitrogen flame retardant is 2 to 4 parts; the preferable using amount of the antioxidant is 0.3-0.5 part; the preferable using amount of the diffusion oil is 0.2-0.4 part; the preferable using amount of the lubricant is 0.4-0.6 part.
Preferably, in the halogen-free flame-retardant polyethylene material, the flexural modulus of the LDPE is 90MPa to 120MPa, the elongation at break is more than 150%, and the melt index under the test condition of 190 ℃ and 2.16kg is 20g/10min to 50g/10 min.
Preferably, in the halogen-free flame-retardant polyethylene material, the halogen-free phosphate flame retardant is selected from at least one of bisphenol A-bis (diphenyl phosphate) (BDP), cresyldiphenyl phosphate (CDP), resorcinol bis (diphenyl phosphate) (RDP), tricresyl phosphate (TCP), trixylenyl phosphate (TXP), and polyaryl phosphate (PX-200); more preferably, the halogen-free phosphate flame retardant is at least one selected from the group consisting of bisphenol a-bis (diphenyl phosphate), cresyldiphenyl phosphate, resorcinol bis (diphenyl phosphate), and tricresyl phosphate; still more preferably, the halogen-free phosphate ester flame retardant is selected from one of bisphenol A-bis (diphenyl phosphate), resorcinol bis (diphenyl phosphate) or a combination thereof.
Preferably, in the halogen-free flame-retardant polyethylene material, the nitrogen-based flame retardant is selected from at least one of melamine, melamine cyanurate, dimelamine pyrophosphate, melamine borate, melamine orthophosphate and melamine polyphosphate; more preferably, the nitrogen flame retardant is at least one selected from melamine, melamine cyanurate, melamine borate and melamine polyphosphate; still more preferably, the nitrogen-based flame retardant is selected from melamine borate.
Preferably, in the halogen-free flame-retardant polyethylene material, the antioxidant is 4, 4' -butylidene bis (6-tertiary butyl-3-methylphenol) (CAS number: 85-60-9) and dioctadecyl pentaerythritol diphosphite (CAS number: 3806-34-6) in a mass ratio of 1: (2-6) a compound antioxidant; further preferably, the antioxidant is 4, 4' -butylidene bis (6-tert-butyl-3-methylphenol) and dioctadecyl pentaerythritol diphosphite in a mass ratio of 1: (3-5) a compound antioxidant; still more preferably, the antioxidant is 4, 4' -butylidene bis (6-tert-butyl-3-methylphenol) and dioctadecyl pentaerythritol diphosphite in a mass ratio of 1: 4 a compound antioxidant.
Preferably, in the halogen-free flame-retardant polyethylene material, the diffusion oil is octamethylcyclotetrasiloxane; more preferably, the diffusion oil is octamethylcyclotetrasiloxane having a viscosity of 500 mPas to 700 mPas at 25 ℃.
Preferably, in the halogen-free flame-retardant polyethylene material, the lubricant is selected from at least one of stearic acid, stearate ester, Ethylene Bis Stearamide (EBS) and polyethylene wax; further preferably, the lubricant is at least one selected from stearic acid, calcium stearate, zinc stearate, butyl stearate, ethylene bis stearamide and polyethylene wax; still further preferred, the lubricant is selected from ethylene bis stearamide.
The invention provides a preparation method of the halogen-free flame-retardant polyethylene material, which comprises the following steps:
1) mixing LDPE and diffusion oil in a blender;
2) adding the nitrogen flame retardant, the antioxidant and the lubricant into a stirrer, and mixing to obtain a mixture;
3) adding the mixture into a main feeding port of a double-screw extruder, and adding the halogen-free phosphate flame retardant into the 4 th-5 th section of a screw of the double-screw extruder through a liquid flame retardant adding device;
4) and mixing, extruding and granulating by using a double-screw extruder to obtain the halogen-free flame-retardant polyethylene material.
Preferably, in the step 1) of the preparation method of the halogen-free flame-retardant polyethylene material, the mixing temperature is 40-60 ℃; further preferably, the temperature of mixing is 50 ℃.
Preferably, in the step 3) of the preparation method of the halogen-free flame-retardant polyethylene material, the liquid flame retardant adding device comprises a halogen-free phosphate ester flame retardant raw material tank, an air pump oil filling pipe, an intermediate tank, a metering device, an output pipeline and an atomizing air gun which are connected in sequence.
Preferably, in the preparation method of the halogen-free flame retardant polyethylene material, in the step 3) of the liquid flame retardant adding device, a heating bag is arranged outside the halogen-free phosphate ester flame retardant raw material tank, the temperature is set to be 110-130 ℃, so that the viscosity of the halogen-free phosphate ester flame retardant can be reduced, and the halogen-free phosphate ester flame retardant is convenient to convey; further preferably, the heating bag is set to a temperature of 120 ℃.
Preferably, in the step 3) of the liquid flame retardant adding device of the preparation method of the halogen-free flame-retardant polyethylene material, the intermediate tank is provided with an infrared detector, and a marking line is arranged in the intermediate tank and stops oil transportation when exceeding the marking line; a temperature control system is arranged in the intermediate tank, and the temperature is set to be 110-130 ℃; more preferably, the intermediate tank is set to a temperature of 120 ℃.
Preferably, in the step 3) of the liquid flame retardant adding device of the preparation method of the halogen-free flame retardant polyethylene material, the metering device consists of a metering tank, a metering scale, a control valve and a PLC control system; the addition amount of the liquid flame retardant is set through a PLC control system, the metering scale is used for accurately metering, and a valve is controlled to adjust the difference.
Preferably, in the preparation method of the halogen-free flame-retardant polyethylene material, the twin-screw extruder is a co-rotating twin-screw extruder, and the specific parameters are as follows: the diameter of the screw is 70-95 mm, and the length-diameter ratio of the screw is (42-46): 1.
preferably, in step 4) of the preparation method of the halogen-free flame-retardant polyethylene material, the temperature parameters of each zone of the twin-screw extruder are as follows: the temperature of the first section is 100-115 ℃, the temperature of the second section from the 2 nd section to the 4 th section is 160-170 ℃, the temperature of the second section from the 5 th section to the 11 th section is 165-160 ℃, and the temperature of the machine head is 160 ℃.
The invention also provides application of the halogen-free flame-retardant polyethylene material in preparing simulated ornaments and/or plug inner films.
Preferably, in application, the simulated ornaments include but are not limited to simulated greening lawns, simulated Christmas trees, simulated branches and other seasonal simulation products.
The invention has the beneficial effects that:
the halogen-free flame-retardant polyethylene material disclosed by the invention is excellent in flame-retardant and mechanical properties, good in flexibility of a workpiece, good in rebound resilience, environment-friendly and non-toxic, capable of being recycled, and has the flame-retardant property reaching UL94V-2, good in self-extinguishing property, simple in preparation method, low in production cost, easy to carry out industrial large-scale production, and suitable for preparing simulated ornaments and plug inner films.
In particular, the advantages of the invention are as follows:
1) the medium-high fluidity LDPE is selected as the matrix resin, the medium-high fluidity LDPE is mainly applied to the simulated decoration industry and plug inner membranes, and is mainly used for simulated green lawns, simulated Christmas trees, simulated branches and the like, and the requirements of the products on the matrix resin are low hardness, low cost, good rebound resilience, difficult fracture, aging resistance, good simulation effect and easy processing and forming, and the medium-high fluidity LDPE can meet the requirements. The flame-retardant elastomer used in the prior art can meet the requirement on toughness, but has a matte appearance, high cost and unsuitability, and the flame-retardant HDPE or PP has high hardness and insufficient softness.
2) The invention uses the combination of phosphate flame retardant and melamine borate as flame retardant, the phosphorus compound of the phosphate flame retardant generates non-flammable liquid film of phosphoric acid during burning, then phosphoric acid is further dehydrated to produce metaphosphoric acid, metaphosphoric acid is further polymerized to form metaphosphoric acid phosphate, in the process, not only the liquid film produced by phosphoric acid plays a covering role, but also the metaphosphoric acid phosphate is strong acid and strong dehydrator, which can dehydrate and carbonize polyethylene material, the carbonized film isolates air, plays a flame retardant role, the melamine borate is used as the gas source in the flame retardant system, and the existence of boron can form a boron-containing glass bench protective layer, which plays a role in heat insulation and air isolation, so that the polyethylene material achieves the flame retardant effect, in addition, the liquid flame retardant has lower viscosity, and can further improve the fluidity of the material.
3) The antioxidant is compounded by antioxidant 4, 4' -butylidene bis (6-tert-butyl-3-methylphenol) and dioctadecyl pentaerythritol diphosphite, and the dioctadecyl pentaerythritol diphosphite has better heat-resistant protection in the processing process and later yellowing-resistant protection; 4, 4' -butylidene bis (6-tert-butyl-3-methylphenol) has low volatility, high thermal stability and no decomposition during high temperature processing. The compound antioxidant system can protect the flame-retardant polyethylene material during processing and later storage.
4) The invention selects the diffusion oil because the diffusion oil has certain viscosity, so that the auxiliary agent with less relative weight can be uniformly adhered and distributed on the polyethylene particles, and the diffusion oil has internal and external lubricity, reduces the friction coefficient, improves the demoulding performance of the product, has better dispersibility on the pigment than other low molecular oil, and can be prepared into various bright colors.
5) The liquid adding device comprises a canned phosphate flame retardant, an air pump oil filling pipe, an intermediate tank, a metering device, an output pipeline and an atomizing air gun, wherein the liquid is kept at a temperature of more than 100 ℃ in the whole process, the viscosity is reduced, the conveying is facilitated, the PLC system is used for controlling, the metering scale is used for accurately metering, the liquid flame retardant is added according to the requirement, a screw machine is fed into 4-5 sections of a screw, the screw machine has enough length and is fully mixed with other materials, and the decomposition of the phosphate flame retardant due to long adding time is avoided.
Drawings
FIG. 1 is a schematic diagram of a preparation method of a halogen-free flame-retardant polyethylene material of the invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The starting materials used in the examples are, unless otherwise specified, commercially available from conventional sources.
The raw material compositions (parts by mass) of the flame retardant polyethylene materials of examples 1 to 3 and comparative examples 1 to 5 are shown in table 1 below. In Table 1, LDPE G812, produced Singapore polyolefin, MI is 25G/10 min; LDPE 868-000, China famous petrochemical of origin, MI 50g/10 min. The antioxidant is 4, 4' -butylidene bis (6-tertiary butyl-3-methylphenol) and dioctadecyl pentaerythritol diphosphite according to the mass ratio of 1: 4 a compound antioxidant. The diffusion oil is octamethylcyclotetrasiloxane.
TABLE 1 raw material parts by mass composition of flame retardant polyethylenes of examples 1 to 3 and comparative examples 1 to 5
FIG. 1 is a schematic diagram of a preparation method of a halogen-free flame-retardant polyethylene material of the invention. Referring to fig. 1, a method for preparing the flame retardant polyethylene materials of examples 1 to 3 and comparative examples 3 to 4 is illustrated, which comprises the steps of:
1) putting LDPE into a high-speed stirrer (500r/min) according to the mass part ratio shown in the table 1, covering a barrel cover, starting stirring, adding diffusion oil in a certain ratio from an oil filling port on the barrel cover, stirring for 1min, and setting the temperature to be 50 ℃;
2) adding the nitrogen flame retardant, the antioxidant and the lubricant into the mixture obtained in the step 1) according to the proportion, stirring for 2min, and adding the uniformly mixed material into a double-screw extruder from a main feed;
3) and adding the halogen-free phosphate flame retardant into the double-screw extruder from an oil filling port between 4-5 sections of the screw through a liquid flame retardant adding device.
4) And mixing and extruding the materials in a co-rotating double-screw extruder, cooling, and then bracing, granulating and screening to obtain the halogen-free flame-retardant polyethylene material with uniform particles.
The liquid flame retardant adding device in the step 3) comprises a halogen-free phosphate flame retardant raw material tank, an air pump oil filling pipe, a middle tank, a metering device, an output pipeline and an atomizing air gun.
And 3) the halogen-free phosphate flame retardant raw material tank is provided with a heating bag at the outer tank, the temperature is set to be 120 ℃, so that the viscosity of the halogen-free phosphate flame retardant raw material tank is reduced, and the halogen-free phosphate flame retardant raw material tank is convenient to convey.
The intermediate tank in the step 3) has an infrared detection function, a marking line is arranged in the tank, oil transportation is suspended when the marking line exceeds the marking line, a temperature control system is arranged in the tank, and the temperature is set to be 120 ℃.
And 3) the metering device consists of a metering tank, a metering scale, a control valve and a PLC (programmable logic controller) control system, wherein the addition amount of the liquid flame retardant is set in the PLC control system, the metering scale is used for accurately metering, and the control valve is used for carrying out differential adjustment.
The diameter of the screw of the co-rotating twin-screw extruder in the step 4) is 75mm, the length-diameter ratio of the screw is 44:1, and the temperature of each zone is as follows: the temperature of the first section is 100-115 ℃, the temperature of the second section to the fourth section is 160-170 ℃, the temperature of the fifth section to the eleventh section is 165-160 ℃, and the temperature of the machine head is 160 ℃.
Examples 1 to 3 and comparative examples 3 to 4 are different in that different material addition amounts are added in parts by mass corresponding to the examples or comparative examples.
The preparation method of the flame retardant polyethylene material of comparative example 1 comprises the following steps:
1) putting LDPE into a high-speed stirrer according to the mass part ratio shown in the table 1, covering a barrel cover, starting stirring, adding diffusion oil in a ratio from an oil filling port on the barrel cover, stirring for 1min, and setting the temperature to be 50 ℃;
2) adding the brominated flame retardant, the antioxidant and the lubricant into the mixture in the step 1) according to the proportion, stirring for 2min, and adding the uniformly mixed materials into a double-screw extruder from a main feed;
3) and mixing and extruding the materials in a co-rotating double-screw extruder, cooling, and then bracing, granulating and screening to obtain the halogen-free flame-retardant polyethylene material with uniform particles.
The diameter of the screw of the co-rotating double-screw extruder in the step 3) is 75mm, the length-diameter ratio of the screw is 44:1, and the temperature of each zone is as follows: the temperature of the first section is 100-115 ℃, the temperature of the second section to the fourth section is 160-170 ℃, the temperature of the fifth section to the eleventh section is 165-160 ℃, and the temperature of the machine head is 160 ℃.
The preparation method of the flame retardant polyethylene material of comparative example 2 comprises the following steps:
1) putting LDPE into a high-speed stirrer according to the mass part ratio shown in the table 1, covering a barrel cover, starting stirring, adding diffusion oil in a ratio from an oil filling port on the barrel cover, stirring for 1min, and setting the temperature to be 50 ℃;
2) adding the ammonium polyphosphate compounded flame retardant, the antioxidant and the lubricant into the mixture 1) according to the proportion, stirring for 2min, and adding the uniformly mixed materials into a double-screw extruder from a main feed;
3) and mixing and extruding the materials in a co-rotating double-screw extruder, cooling, and then bracing, granulating and screening to obtain the halogen-free flame-retardant polyethylene material with uniform particles.
The diameter of the screw of the co-rotating double-screw extruder in the step 3) is 75mm, the length-diameter ratio of the screw is 44:1, and the temperature of each zone is as follows: the temperature of the first section is 100-115 ℃, the temperature of the second section to the fourth section is 180-190 ℃, the temperature of the fifth section to the eleventh section is 195-190 ℃, and the temperature of the machine head is 190 ℃.
The preparation method of the flame retardant polyethylene material of comparative example 5 comprises the following steps:
1) putting LDPE and halogen-free phosphate flame retardant into a high-speed stirrer according to a ratio, covering a barrel cover, starting stirring, adding a ratio of diffusion oil from an oil filling port on the barrel cover, stirring for 1min, and setting the temperature to be 50 ℃;
2) adding an antioxidant and a lubricant into the mixture obtained in the step 1) according to a ratio, stirring for 2min, and adding the uniformly mixed material into a double-screw extruder from a main feed;
3) and mixing and extruding the materials in a co-rotating double-screw extruder, cooling, and then bracing, granulating and screening to obtain the halogen-free flame-retardant polyethylene material with uniform particles.
The diameter of the screw of the co-rotating double-screw extruder in the step 3) is 75mm, the length-diameter ratio of the screw is 44:1, and the temperature of each zone is as follows: the temperature of the first section is 100-115 ℃, the temperature of the second section to the fourth section is 160-170 ℃, the temperature of the fifth section is 165-160 ℃, and the temperature of the machine head is 160 ℃.
The test results of the flame retardant polyethylene materials of examples 1 to 3 and comparative examples 1 to 5 are shown in Table 2.
TABLE 2 test results of the flame retardant polyethylenes of examples 1 to 3 and comparative examples 1 to 5
The index test method in table 2 is as follows:
melt Index (MI): according to ASTM D-1238;
density: according to ASTM D-792;
elongation at break: according to ASTM D-638;
cantilever beam impact strength: according to ASTM D-256;
flame retardancy: the vertical burning performance is tested according to the UL94 vertical burning standard, and the thicknesses of the sample strips are 1.6mm and 3.2 mm;
a color difference meter: medium NH310, light source D65.
As can be seen from Table 2: the phosphate flame retardant and the nitrogen flame retardant in the halogen-free flame-retardant polyethylene material have a synergistic effect, are small in addition amount, have little influence on mechanical properties, and can improve the fluidity. The halogen-free flame-retardant polyethylene has good fluidity and excellent mechanical property, the flame-retardant property of the halogen-free flame-retardant polyethylene meets UL94V-2, and the halogen-free flame-retardant polyethylene can be applied to the industries of simulated ornaments with low flame-retardant requirements and higher environmental protection requirements, such as simulated green lawns, simulated Christmas trees, simulated branches and plug inner membranes. The manufactured product has good flexibility, good resilience, can be repeatedly recycled, and is environment-friendly and nontoxic, and the hand feeling is not pricked.
The invention uses the special liquid flame retardant adding device, the liquid flame retardant is convenient to add, the metering and the setting adjustment are easy, the process technology is mature, the quantitative production can be realized, the working efficiency is high, and the cost is low. As can be seen from comparative example 5, if the phosphoric acid ester-based liquid flame retardant is directly fed from the main feed without being fed from a special liquid flame retardant feeding apparatus into the twin-screw extruder, the flame retardant is degraded, the flame retardant efficiency is seriously decreased, and the toughness is deteriorated.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. A halogen-free flame-retardant polyethylene material is characterized in that: the composite material comprises the following raw materials in parts by mass:
LDPE (Low-Density polyethylene): 80-95 parts of a modifier;
halogen-free phosphate flame retardant: 5-15 parts of a solvent;
nitrogen-based flame retardant: 1-5 parts;
antioxidant: 0.2-0.8 part;
diffusion of oil: 0.1-0.5 part;
lubricant: 0.3-0.7 part;
the LDPE has a flexural modulus of 90-120 MPa, an elongation at break of more than 150%, and a melt index of 20-50 g/10min at 190 ℃ and 2.16kg under test conditions;
the halogen-free phosphate flame retardant is selected from at least one of bisphenol A-bis (diphenyl phosphate), cresyldiphenyl phosphate, resorcinol bis (diphenyl phosphate), tricresyl phosphate, trixylenyl phosphate and polyaryl phosphate;
the nitrogen flame retardant is selected from melamine borate;
the antioxidant is 4, 4' -butylidene bis (6-tertiary butyl-3-methylphenol) and dioctadecyl pentaerythritol diphosphite according to the mass ratio of 1: (2-6) a compound antioxidant;
the diffusion oil is octamethylcyclotetrasiloxane;
the preparation method of the halogen-free flame-retardant polyethylene material comprises the following steps:
1) mixing LDPE and diffusion oil in a blender;
2) adding the nitrogen flame retardant, the antioxidant and the lubricant into a stirrer, and mixing to obtain a mixture;
3) adding the mixture into a main feeding port of a double-screw extruder, and adding the halogen-free phosphate flame retardant into the 4 th-5 th section of a screw of the double-screw extruder through a liquid flame retardant adding device;
4) and mixing, extruding and granulating by using a double-screw extruder to obtain the halogen-free flame-retardant polyethylene material.
2. The halogen-free flame-retardant polyethylene material according to claim 1, characterized in that: the lubricant is at least one selected from stearic acid, stearate ester, ethylene bis-stearamide and polyethylene wax.
3. The preparation method of the halogen-free flame-retardant polyethylene material according to any one of claims 1 to 2, characterized in that: the method comprises the following steps:
1) mixing LDPE and diffusion oil in a blender;
2) adding the nitrogen flame retardant, the antioxidant and the lubricant into a stirrer, and mixing to obtain a mixture;
3) adding the mixture into a main feeding port of a double-screw extruder, and adding the halogen-free phosphate flame retardant into the 4 th-5 th section of a screw of the double-screw extruder through a liquid flame retardant adding device;
4) and mixing, extruding and granulating by using a double-screw extruder to obtain the halogen-free flame-retardant polyethylene material.
4. The preparation method of the halogen-free flame-retardant polyethylene material according to claim 3, characterized in that: in the step 3), the liquid flame retardant adding device comprises a halogen-free phosphate flame retardant raw material tank, an air pump oil filling pipe, an intermediate tank, a metering device, an output pipeline and an atomizing air gun which are sequentially connected.
5. The use of the halogen-free flame-retardant polyethylene material according to any one of claims 1-2 in the preparation of artificial ornaments and/or plug inner films.
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| CN110724326A (en) * | 2019-09-12 | 2020-01-24 | 广东聚石化学股份有限公司 | Halogen-free flame-retardant high-density polyethylene material and preparation method and application thereof |
| CN116693964B (en) * | 2023-06-12 | 2023-12-26 | 惠州森叶工艺品有限公司 | Precipitation type polyethylene material, preparation method and simulation pine branch |
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