CN115707732A - PP flame-retardant master batch and processing method thereof - Google Patents
PP flame-retardant master batch and processing method thereof Download PDFInfo
- Publication number
- CN115707732A CN115707732A CN202110950674.8A CN202110950674A CN115707732A CN 115707732 A CN115707732 A CN 115707732A CN 202110950674 A CN202110950674 A CN 202110950674A CN 115707732 A CN115707732 A CN 115707732A
- Authority
- CN
- China
- Prior art keywords
- flame
- parts
- master batch
- retardant
- retardant master
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Fireproofing Substances (AREA)
Abstract
The invention provides a PP flame-retardant master batch and a processing method thereof, relating to the technical field of flame retardance. The PP flame-retardant master batch comprises the following raw materials in parts by weight: 15-18 parts of sodium bicarbonate, 20-33 parts of magnesium hydroxide, 16-24 parts of aluminum hydroxide, 3-5 parts of heat stabilizer, 3-5 parts of flame retardant synergist, 20-25 parts of polypropylene, 7-9 parts of ammonium polyphosphate and 11-14 parts of natural graphite. The expandable graphite can absorb a large amount of heat in the expansion process, the temperature of the system is reduced, a tough carbon layer is formed on the surface of a high polymer, a combustible substance is separated from a heat source and is compounded with sodium bicarbonate, magnesium hydroxide, aluminum hydroxide and ammonium polyphosphate for use, the flame retardant effect can be achieved, the high-temperature combustion cannot release corrosive gas, the magnesium hydroxide and the aluminum hydroxide are heated and decomposed at high temperature to absorb a large amount of heat and decompose to release water vapor, the effect of diluting combustible gas can be achieved, and smoke and combustible volatile substances can be absorbed.
Description
Technical Field
The invention relates to the technical field of flame retardance, in particular to a PP flame-retardant master batch and a processing method thereof.
Background
The PP flame-retardant master batch is particles formed by a PP flame retardant and a carrier through a granulator, the PP flame-retardant master batch is divided into inorganic flame-retardant master batch and halogen-free flame-retardant master batch and phosphorus-bromine composite flame-retardant master batch, the phosphorus-bromine composite flame-retardant master batch has to be the most efficient product, and the PP material with low addition amount can be matched with any color without precipitation as long as the addition amount is less than 4 percent, and the mechanical property of the material is not influenced. The PP flame-retardant master batch can be divided into an injection molding grade, a wire drawing grade and an extrusion grade, the PP flame-retardant master batch is a product which is usually adopted for flame-retardant modification of polypropylene at present, the characteristics are enhanced, the advantages are highlighted, the process is mature, the affinity is excellent, the PP flame-retardant master batch can be used in combination with the polypropylene, a uniform and stable dispersion system can be completely obtained through melt blending, the deterioration of the physical properties of the material is reduced, the flame-retardant elements are fully utilized, the flame-retardant efficiency is extremely good in migration resistance, and the phenomenon of frost emission can not occur even after long-term storage after use. Excellent weather resistance, and no yellowing and failure after long-term placement in the air.
The flame-retardant PP master batch prepared from common halogen-containing flame retardants can release smoke and corrosive gases which pollute the environment and harm human health while the combustion of the flame-retardant PP master batch plays a role, the damage of the corrosive gases to buildings and equipment even exceeds the fire hazard per se, and more seriously, toxic carcinogens such as polybrominated dibenzo-dithiane and polybrominated dibenzofuran can be formed when some bromine flame retardants are combusted or thermally cracked, and the smoke suppression effect of the traditional flame-retardant PP master batch is poor.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a PP flame-retardant master batch and a processing method thereof, which solve the problems that the traditional disinfectant can irritate the skin and has pungent smell.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the PP flame-retardant master batch comprises the following raw materials in parts by weight: 15-18 parts of sodium bicarbonate, 20-33 parts of magnesium hydroxide, 16-24 parts of aluminum hydroxide, 3-5 parts of heat stabilizer, 3-5 parts of flame retardant synergist, 20-25 parts of polypropylene, 7-9 parts of ammonium polyphosphate and 11-14 parts of natural graphite.
Preferably, the heat stabilizer comprises one or more of sulfydryl compound, dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate and dibasic lead phosphite.
Preferably, the flame retardant synergist comprises one or more of antimony trioxide, zinc borate and red phosphorus.
Preferably, the PP flame-retardant master batch and the processing method thereof comprise the following processing steps:
s1, raw material processing
(3) Firstly, mixing natural graphite and concentrated sulfuric acid according to the proportion of 1.5, acidizing the natural graphite, then adding the acidized natural graphite into clear water for washing, filtering and removing impurities, then adding the natural graphite into drying equipment for drying after washing and removing the impurities, finally adding the dried natural graphite into heating equipment, and puffing at 900-1000 ℃ to prepare expandable graphite for later use;
(4) adding polypropylene into a drying device, and drying for 2-3 h at 70-110 ℃ to obtain dried polypropylene for later use;
s2, mixing raw materials
Adding sodium bicarbonate, magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate and natural graphite into a stirrer according to a ratio, stirring and mixing at a high speed of 1000-1500 r/min for 8-12 min, and adding a flame retardant synergist according to a ratio in the stirring and mixing process to obtain a compound flame retardant for later use;
adding polypropylene and a heat stabilizer into a stirrer according to a ratio, stirring and mixing at a rotating speed of 800-1000 r/min for 5-7 min, then adding a compound combustion improver, adjusting the rotating speed of the stirrer to a rotating speed of 1500-2000 r/min, stirring and mixing at a high speed for 10-15 min, and obtaining a raw material mixture of PP flame-retardant master batch;
s3, granulating and forming
Adding the raw material mixture of the PP flame-retardant master batch obtained in the step S2 into a double-screw extruder, adjusting the rotating speed of a driving motor of the extruder to be 600-800 r/min, the rotating speed of a motor of a feeding hole to be 400-500 r/min, and the temperature of a die head to be 150-200 ℃ for extrusion;
adding the extruded raw material mixture of the PP flame-retardant master batch into a granulator for granulation, and finally adding drying equipment for drying at 50-70 ℃ for 7-10 h to obtain a finished product of the PP flame-retardant master batch;
s4, packaging and storing
And (4) cooling the PP flame-retardant master batch finished product dried in the step (S3) at room temperature for 5-8 h, bagging and sealing by using a packaging machine, and storing in a cool and dry place.
Preferably, the drying temperature of the natural graphite is 80-110 ℃, and the drying time is 5-6 h.
Preferably, the moisture content of the polypropylene in the step S1 is controlled to be 0.05% or less.
(III) advantageous effects
The invention provides a PP flame-retardant master batch and a processing method thereof. The method has the following beneficial effects:
1. the expandable graphite begins to slightly expand at 220 ℃, rapidly expands at 230-280 ℃, then has the volume of 100-250 times of the original volume, releases acid radical ions in an interlayer in the expansion process, promotes dehydration and carbonization, can combine free radicals generated by combustion to interrupt chain reaction, can absorb a large amount of heat in the expansion process, reduces the temperature of a system, forms a tough carbon layer on the surface of a high polymer, separates combustible from a heat source, can generate a coordination effect to achieve the purpose of flame retardance by the combined use of the expandable graphite, sodium bicarbonate, magnesium hydroxide, aluminum hydroxide and ammonium polyphosphate, and can not release corrosive gas polluting the environment and harming human health through high-temperature combustion.
2. The magnesium hydroxide and the aluminum hydroxide are heated and decomposed at high temperature to absorb a large amount of heat, reduce the flame temperature and decompose and release water vapor, so that the magnesium hydroxide and the aluminum hydroxide can dilute combustible gas, and the generated metal oxide after decomposition has extremely high specific surface area, can absorb smoke and combustible volatile substances and covers the surface of a material to form a protective layer to delay or prevent combustion.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a PP flame-retardant master batch which comprises the following raw materials in parts by weight: 15 parts of sodium bicarbonate, 20 parts of magnesium hydroxide, 16 parts of aluminum hydroxide, 3 parts of heat stabilizer, 3 parts of flame retardant synergist, 20 parts of polypropylene, 7 parts of ammonium polyphosphate and 11 parts of natural graphite.
The ammonium polyphosphate is an inorganic flame retardant with good performance, is cheaper than an organic flame retardant, has low toxicity and good thermal stability, and can be used for flame retardance of plastics independently or in combination with other flame retardants.
The heat stabilizer comprises one or more of sulfydryl compound, dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate and dibasic lead phosphite.
The flame retardant synergist comprises one or more of antimony trioxide, zinc borate and red phosphorus.
A PP flame-retardant master batch and a processing method thereof comprise the following processing steps:
s1, raw material processing
(1) Firstly, mixing natural graphite and concentrated sulfuric acid according to the proportion of 1.5, acidizing the natural graphite, then adding the acidized natural graphite into clear water for washing, filtering and removing impurities, then adding the natural graphite into drying equipment for drying after washing and removing the impurities, finally adding the dried natural graphite into heating equipment, and puffing at 900 ℃ to prepare expandable graphite for later use;
(2) adding polypropylene into a drying device, and drying for 2h at 70 ℃ to obtain dried polypropylene for later use;
the expandable graphite begins to slightly expand at 220 ℃, rapidly expands at 230-280 ℃, the volume of the expandable graphite can reach 100-250 times of the original volume, acid radical ions in an interlayer are released in the expansion process of the expandable graphite to promote dehydration and carbonization, free radicals generated by combustion can be combined to interrupt chain reaction, a large amount of heat can be absorbed in the expansion process, the temperature of a system is reduced, a tough carbon layer is formed on the surface of a high polymer, a combustible substance is separated from a heat source, the expandable graphite is compounded with sodium bicarbonate, magnesium hydroxide, aluminum hydroxide and ammonium polyphosphate for use, a coordination effect can be generated to achieve the purpose of flame retardance, and corrosive gas polluting the environment and damaging the health of a human body cannot be released by high-temperature combustion;
magnesium hydroxide and aluminum hydroxide are heated and decomposed at high temperature, absorb a large amount of heat, reduce the flame temperature, decompose and release water vapor at the same time, can play a role in diluting combustible gas, and the metal oxide generated after decomposition has extremely high specific surface area, can absorb smoke and combustible volatile substances, and covers the surface of a material to form a protective layer to delay or prevent combustion;
s2, mixing raw materials
Adding sodium bicarbonate, magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate and natural graphite into a stirrer according to a ratio, stirring and mixing at a high speed of 1000r/min for 8min, and adding a flame retardant synergist according to a ratio in the stirring and mixing process to obtain a compound flame retardant for later use;
adding polypropylene and a heat stabilizer into a stirrer according to a ratio, stirring and mixing for 5min at a rotating speed of 800r/min, then adding a compounded combustion improver, and adjusting the rotating speed of the stirrer to 1500r/min, stirring and mixing at a high speed for 10min to obtain a raw material mixture of PP flame-retardant master batches;
s3, granulating and forming
Adding the raw material mixture of the PP flame-retardant master batch obtained in the step S2 into a double-screw extruder, adjusting the rotating speed of a driving motor of the extruder to 600r/min, the rotating speed of a motor of a feeding port to 400r/min and the temperature of a die head to 150 ℃, and extruding;
adding the extruded raw material mixture of the PP flame-retardant master batch into a granulator for granulation, and finally adding drying equipment for drying at 50 ℃ for 7 hours to obtain a finished PP flame-retardant master batch;
s4, packaging and storing
And (4) cooling the PP flame-retardant master batch finished product dried in the step (S3) at room temperature for 5-8 h, bagging and sealing by using a packaging machine, and storing in a cool and dry place.
The drying temperature of the natural graphite is 80 ℃, and the drying time is 5h.
The moisture content of the polypropylene in the step S1 is controlled to be below 0.05 percent.
Example two:
the embodiment of the invention provides a PP flame-retardant master batch which comprises the following raw materials in parts by weight: 18 parts of sodium bicarbonate, 33 parts of magnesium hydroxide, 24 parts of aluminum hydroxide, 5 parts of heat stabilizer, 5 parts of flame retardant synergist, 25 parts of polypropylene, 9 parts of ammonium polyphosphate and 14 parts of natural graphite.
The ammonium polyphosphate is an inorganic flame retardant with good performance, is cheaper than an organic flame retardant, has low toxicity and good thermal stability, and can be used for flame retardance of plastics independently or in combination with other flame retardants.
The heat stabilizer comprises one or more of sulfydryl compound, dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate and dibasic lead phosphite.
The flame retardant synergist comprises one or more of antimony trioxide, zinc borate and red phosphorus.
A PP flame-retardant master batch and a processing method thereof comprise the following processing steps:
s1, raw material processing
(1) Firstly, mixing natural graphite and concentrated sulfuric acid according to a ratio of 1.5, acidizing the natural graphite, then adding the acidized natural graphite into clear water for washing, filtering to remove impurities, adding the washed natural graphite into drying equipment for drying after the impurities are removed by washing, finally adding the dried natural graphite into heating equipment, and puffing at 1000 ℃ to obtain expandable graphite for later use;
(2) adding polypropylene into a drying device, and drying for 3h at 110 ℃ to obtain dried polypropylene for later use;
the expandable graphite begins to slightly expand at 220 ℃, rapidly expands at 230-280 ℃, the volume of the expandable graphite can reach 100-250 times of the original volume, acid radical ions in an interlayer are released in the expansion process of the expandable graphite to promote dehydration and carbonization, free radicals generated by combustion can be combined to interrupt chain reaction, a large amount of heat can be absorbed in the expansion process, the temperature of a system is reduced, a tough carbon layer is formed on the surface of a high polymer, a combustible substance is separated from a heat source, the expandable graphite is compounded with sodium bicarbonate, magnesium hydroxide, aluminum hydroxide and ammonium polyphosphate for use, a coordination effect can be generated to achieve the purpose of flame retardance, and corrosive gas polluting the environment and damaging the health of a human body cannot be released by high-temperature combustion;
magnesium hydroxide and aluminum hydroxide are heated and decomposed at high temperature, absorb a large amount of heat, reduce the flame temperature, decompose and release water vapor at the same time, can play a role in diluting combustible gas, and the metal oxide generated after decomposition has extremely high specific surface area, can absorb smoke and combustible volatile substances, and covers the surface of a material to form a protective layer to delay or prevent combustion;
s2, mixing raw materials
Adding sodium bicarbonate, magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate and natural graphite into a stirrer according to a ratio, stirring and mixing at a high speed of 1500r/min for 12min, and adding a flame retardant synergist according to a ratio in the stirring and mixing process to obtain a compound flame retardant for later use;
adding polypropylene and a heat stabilizer into a stirrer according to a ratio, stirring and mixing for 7min at a rotating speed of 1000r/min, then adding a compounded combustion improver, and adjusting the rotating speed of the stirrer to a rotating speed of 2000r/min, stirring and mixing at a high speed for 15min to obtain a raw material mixture of PP flame-retardant master batches;
s3, granulating and forming
Adding the raw material mixture of the PP flame-retardant master batch obtained in the step S2 into a double-screw extruder, adjusting the rotating speed of a driving motor of the extruder to be 800r/min, the rotating speed of a motor of a feeding hole to be 500r/min, and the temperature of a die head to be 200 ℃ for extrusion;
adding the extruded raw material mixture of the PP flame-retardant master batch into a granulator for granulation, and finally adding drying equipment for drying at 70 ℃ for 10 hours to obtain a finished product of the PP flame-retardant master batch;
s4, packaging and storing
And (4) cooling the PP flame-retardant master batch finished product dried in the step (S3) at room temperature for 8h, bagging and sealing by using a packaging machine, and storing in a cool and dry place.
The drying temperature of the natural graphite is 110 ℃, and the drying time is 6h.
The moisture content of the polypropylene in the step S1 is controlled to be below 0.05 percent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The PP flame-retardant master batch is characterized in that: the feed comprises the following raw materials in parts by weight: 15-18 parts of sodium bicarbonate, 20-33 parts of magnesium hydroxide, 16-24 parts of aluminum hydroxide, 3-5 parts of heat stabilizer, 3-5 parts of flame retardant synergist, 20-25 parts of polypropylene, 7-9 parts of ammonium polyphosphate and 11-14 parts of natural graphite.
2. The PP flame retardant masterbatch according to claim 1, wherein: the heat stabilizer comprises one or more of hydrosulfide, dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate and dibasic lead phosphite.
3. The PP flame-retardant master batch according to claim 1, characterized in that: the flame retardant synergist comprises one or more of antimony trioxide, zinc borate and red phosphorus.
4. The PP flame-retardant master batch and the processing method thereof according to claim 1, wherein the PP flame-retardant master batch comprises the following components in percentage by weight: the method comprises the following processing steps:
s1, raw material processing
(1) Firstly, mixing natural graphite and concentrated sulfuric acid according to the proportion of 1.5, acidizing the natural graphite, then adding the acidized natural graphite into clear water for washing, filtering and removing impurities, then adding the natural graphite into drying equipment for drying after washing and removing the impurities, finally adding the dried natural graphite into heating equipment, and puffing at 900-1000 ℃ to prepare expandable graphite for later use;
(2) adding polypropylene into a drying device, and drying for 2-3 h at 70-110 ℃ to obtain dried polypropylene for later use;
s2, mixing raw materials
Adding sodium bicarbonate, magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate and natural graphite into a stirrer according to a ratio, stirring and mixing at a high speed of 1000-1500 r/min for 8-12 min, and adding a flame retardant synergist according to a ratio in the stirring and mixing process to obtain a compound flame retardant for later use;
adding polypropylene and a heat stabilizer into a stirrer according to a ratio, stirring and mixing for 5-7 min at a rotating speed of 800-1000 r/min, then adding a compounded combustion improver, adjusting the rotating speed of the stirrer to 1500-2000 r/min, and stirring and mixing at a high speed for 10-15 min to obtain a raw material mixture of PP flame-retardant master batches;
s3, granulating and forming
Adding the raw material mixture of the PP flame-retardant master batch obtained in the step S2 into a double-screw extruder, adjusting the rotating speed of a driving motor of the extruder to be 600-800 r/min, the rotating speed of a motor of a feeding hole to be 400-500 r/min, and the temperature of a die head to be 150-200 ℃ for extrusion;
adding the extruded raw material mixture of the PP flame-retardant master batch into a granulator for granulation, and finally adding drying equipment for drying at 50-70 ℃ for 7-10 h to obtain a PP flame-retardant master batch finished product;
s4, packaging and storing
And (4) cooling the PP flame-retardant master batch finished product dried in the step (S3) at room temperature for 5-8 h, bagging and sealing by using a packaging machine, and storing in a cool and dry place.
5. The PP flame-retardant master batch and the processing method thereof according to claim 1 are characterized in that: the drying temperature of the natural graphite is 80-110 ℃, and the drying time is 5-6 h.
6. The PP flame-retardant master batch and the processing method thereof according to claim 1 are characterized in that: the moisture content of the polypropylene in the step S1 is controlled to be below 0.05 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950674.8A CN115707732A (en) | 2021-08-18 | 2021-08-18 | PP flame-retardant master batch and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950674.8A CN115707732A (en) | 2021-08-18 | 2021-08-18 | PP flame-retardant master batch and processing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115707732A true CN115707732A (en) | 2023-02-21 |
Family
ID=85212593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110950674.8A Pending CN115707732A (en) | 2021-08-18 | 2021-08-18 | PP flame-retardant master batch and processing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115707732A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103554598A (en) * | 2013-10-25 | 2014-02-05 | 西南交通大学 | Preparation method for halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer |
| CN112111099A (en) * | 2020-08-14 | 2020-12-22 | 江苏贝斯塔新材料有限公司 | Flame-retardant low-smoke non-toxic environment-friendly high polymer material and preparation method thereof |
-
2021
- 2021-08-18 CN CN202110950674.8A patent/CN115707732A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103554598A (en) * | 2013-10-25 | 2014-02-05 | 西南交通大学 | Preparation method for halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer |
| CN112111099A (en) * | 2020-08-14 | 2020-12-22 | 江苏贝斯塔新材料有限公司 | Flame-retardant low-smoke non-toxic environment-friendly high polymer material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 于永忠等: "阻燃材料手册", vol. 1, 群众出版社, pages: 137 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101293984B (en) | Expanded carbon flame-proof polypropelene composition and preparation method thereof | |
| CN110054807B (en) | Phosphorus-nitrogen halogen-free flame retardant composition for improving thermal stability by using inorganic metal phosphite and application thereof | |
| WO2019100929A1 (en) | Phosphor aluminium compound-based halogen-free flame retardant compound system and application thereof in glass fiber reinforced engineering plastic | |
| CN106750893B (en) | A kind of anti-flaming polyolefin composition biology base gas source it and constituted | |
| CN105295101A (en) | Microencapsulated red phosphorus fire retardant and preparation method and application thereof | |
| CN105175888A (en) | Halogen-free and flame retardant polypropylene sheet material and preparation method | |
| CN101565543A (en) | Halogen-free flame-retardant nylon 6 material and preparation method thereof | |
| CN104592553A (en) | Composite flame retardant and preparation method thereof | |
| CN108676248A (en) | A kind of high fire-retardance polypropylene material and the preparation method and application thereof | |
| CN103333423B (en) | Compound flame-retardant polystyrene composition and preparation method thereof | |
| JP7477125B2 (en) | Highly flame-retardant halogen-free flame-retardant composition system with high temperature and shear resistance and use thereof | |
| CN111187470A (en) | Efficient flame-retardant polypropylene flame-retardant master batch and preparation method and application thereof | |
| CN110734608A (en) | flame-retardant master batch and application thereof in flame-retardant polypropylene material | |
| CN114031850A (en) | Tin-phosphorus-nitrogen expansion type flame-retardant polypropylene composite material and preparation method thereof | |
| CN105419044A (en) | Halogen-free flame-retardant master batch for plastic woven bags | |
| CN115707732A (en) | PP flame-retardant master batch and processing method thereof | |
| CN111205562A (en) | Preparation method of microwave-stripped organic layered nano silicate and intumescent flame retardant synergistic flame-retardant polypropylene composite material | |
| CN115558181B (en) | Flame-retardant master batch and preparation method and application thereof | |
| CN109897371B (en) | Precipitation-proof environment-friendly flame-retardant plastic master batch and preparation method thereof | |
| CN108250573B (en) | Thermo-oxidative aging resistant halogen-free environment-friendly flame-retardant polypropylene material and preparation method thereof | |
| CN107118469A (en) | A kind of new smoke suppression pipes and electrical casing pipe | |
| CN105419087A (en) | Novel flame-retardant environment-friendly plastic woven bag and production process thereof | |
| CN115505172A (en) | Halogen-free flame retardant and preparation method and application thereof | |
| CN109851955B (en) | Flame-retardant PVC cable material and preparation method thereof | |
| CN111423662A (en) | Flame-retardant PP plastic particle and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |