CN115160691B - High-flame-retardance polypropylene composite material and preparation method thereof - Google Patents
High-flame-retardance polypropylene composite material and preparation method thereof Download PDFInfo
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- CN115160691B CN115160691B CN202210795219.XA CN202210795219A CN115160691B CN 115160691 B CN115160691 B CN 115160691B CN 202210795219 A CN202210795219 A CN 202210795219A CN 115160691 B CN115160691 B CN 115160691B
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 52
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 45
- -1 polypropylene Polymers 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000003063 flame retardant Substances 0.000 claims abstract description 59
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 58
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 41
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 41
- 229920001276 ammonium polyphosphate Polymers 0.000 claims abstract description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004114 Ammonium polyphosphate Substances 0.000 claims abstract description 13
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 26
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 claims description 15
- 229940018564 m-phenylenediamine Drugs 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- WGRZHLPEQDVPET-UHFFFAOYSA-N 2-methoxyethoxysilane Chemical compound COCCO[SiH3] WGRZHLPEQDVPET-UHFFFAOYSA-N 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 4
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 238000013329 compounding Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000979 retarding effect Effects 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Abstract
The invention provides a high flame-retardant polypropylene composite material and a preparation method thereof, which belong to the field of flame-retardant materials and consist of 75-85 parts of polypropylene, 0.5-2.5 parts of kaolin, 10-14 parts of ammonium polyphosphate, 4-8 parts of dipentaerythritol and 0.5-2.5 parts of carbon dots. The LOI of the flame-retardant polypropylene composite material is 29.8%, and the horizontal and vertical combustion is V-0. The carbon dots are prepared by adopting a hydrothermal integrated method, the problem of post-treatment of products is avoided, the carbon dots and the traditional intumescent flame retardant APP are used for compounding and flame retarding, and in order to overcome the defects of the traditional flame retardant APP, kaolin and DPER are introduced for compounding and preparing a novel intumescent flame retardant, and the flame retardant polypropylene composite material with good mechanical properties is prepared.
Description
Technical Field
The invention relates to the field of flame-retardant materials, in particular to a high-flame-retardance polypropylene composite material and a preparation method thereof.
Background
Polypropylene (PP) is a common non-toxic plastic, is inexpensive, can be supplied in large quantities, has good processability, and is thus used in many industries. Its application is limited by its poor toughness, flammability, dripping during combustion, etc. Whereas kaolin is an inexpensive and abundant mineral. Therefore, the PP/kaolin composite material is highly concerned and researched by researchers at home and abroad.
Kaolin (kallin) is a very common nonmetallic mineral and has wide application in the industrial field. As a common natural layered aluminosilicate clay mineral, the clay mineral has very rich energy sources and has very wide application in the fields of industry, material application and the like. The main production areas of the domestic kaolin are Guangdong China with a name of Maoque, fujian Longyan, jiangsu yang mountain, guangxi Hepu and the like. Kaolin has unique physical and chemical properties including thermal adsorption, plasticity, sintering properties, thermal dispersion, optical adsorption and physicochemical inertness. It is an indispensable nonmetallic material in industry, agriculture and military sophisticated technology and mining resources, and kaolin must be used in the manufacture of ceramics, paper, rubber, resin, refractory materials, natural gas refining products, etc. The excellent performance of the kaolin and the characteristics of the PP are fully utilized, and the PP composite material with high cost performance can be produced by a method of filling the PP with the kaolin. Polypropylene (PP) has excellent comprehensive performance and wide application, but has extremely poor flame retardant effect, is easy to burn in air, and releases dense smoke with obvious dripping. The intumescent flame retardant can obviously improve the flame retardance of the polypropylene material, but has the advantages of more addition, poor compatibility, influence on the mechanical properties of the material and greatly limit the use of the composite material.
Disclosure of Invention
The invention aims to provide a high-flame-retardance polypropylene composite material and a preparation method thereof, and solves the technical problems in the background art.
The single kaolin can not be directly combined with the PP material to obtain a composite material with more excellent functions, and the kaolin is required to be modified, or the kaolin and other flame retardants can be compounded and applied, so that the kaolin can play a good role in the PP composite material.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a high flame-retardant polypropylene composite material consists of 75-85 parts of polypropylene, 0.5-2.5 parts of kaolin, 10-14 parts of ammonium polyphosphate, 4-8 parts of dipentaerythritol and 0.5-2.5 parts of carbon dots.
Further, the kaolin is modified kaolin, and the concrete process of the kaolin modification is as follows: mixing and stirring kaolin and water, adding, then adding 2-5% of beta-methoxyethoxysilane, 1-3% of vinyltriethoxysilane and 3-6% of vinyltrimethoxysilane respectively, adding 1-3% of silicone oil, mixing, filtering the mixture, and drying to obtain the modified kaolin, wherein the particle size of the modified kaolin is 1250 meshes.
Further, the carbon dots are composed of 0.1-0.5 part of m-phenylenediamine, 0.1-0.5 part of dicyandiamide and 0.3-1.5 parts of phosphoric acid.
A method for preparing a high flame retardant polypropylene composite material, which comprises the following steps:
step 1: preparing carbon dots by taking m-phenylenediamine, dicyandiamide and phosphoric acid as raw materials;
step 2: preparing an intumescent flame retardant system;
step 3: and (3) mixing polypropylene with the intumescent flame retardant system in the step (2) to prepare the composite material.
Further, the specific process of the step 1 is that 0.5 part of m-phenylenediamine, 0.5 part of dicyandiamide and 1.5 parts of phosphoric acid are mixed as raw materials, and different nitrogen-phosphorus co-doped carbon points are prepared through a hydrothermal method reaction for 6-24 hours at 120-220 ℃.
Further, the specific process of the step 2 is that ammonium polyphosphate, dipentaerythritol and kaolin are mixed with the nitrogen-phosphorus co-doped carbon dots of the step 1, and a shearing device is used for preparing an intumescent flame retardant system under the action of shearing force at normal temperature and normal pressure.
Further, in the intumescent flame retardant system, the mass content of ammonium polyphosphate is 55% -67.5%, the mass content of dipentaerythritol is 25% -32.5%, the mass content of kaolin is 0.5% -5%, and the mass content of N, P-CDs is 0.5% -5%.
Further, the specific process of the step 3 is that 75-80wt% of polypropylene is mixed with 20-25wt% of an intumescent flame retardant system, the materials are added into a double screw extruder for extrusion after being uniformly mixed, and then the extruded materials are pelletized to prepare the flame retardant polypropylene composite material.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) When the total content of APP and DPER in the IFR is 95%, and the carbon point content prepared by taking m-phenylenediamine as a raw material is 5%, the LOI of the flame-retardant polypropylene composite material is 27.7%, and the horizontal and vertical combustion level is V-1.
(2) When the total content of APP and DPER in the IFR is 95% and the kaolin is 5%, the LOI of the flame retardant polypropylene composite material is 28.3%, and the horizontal and vertical burning grade is V-2.
(3) When the total content of APP and DPER in the IFR is 95%, the unmodified kaolin and carbon point are 2.5%, respectively, the LOI of the flame retardant polypropylene composite material is 29.8%, and the horizontal and vertical burning grade is V-0.
(4) The carbon dots are prepared by adopting a hydrothermal integrated method, the problem of post-treatment of products is avoided, the carbon dots and the traditional intumescent flame retardant APP are used for compounding and flame retarding, and in order to overcome the defects of the traditional flame retardant APP, kaolin and DPER are introduced for compounding and preparing a novel intumescent flame retardant, and the flame retardant polypropylene composite material with good mechanical properties is prepared.
Drawings
FIG. 1 is a diagram of an infrared structural characterization of carbon dots of the present invention;
FIG. 2 is a graph of tensile strength and elongation at break of a composite material of the present invention;
FIG. 3 is a graph of flame retardant data for a composite of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
Example 1:
as shown in figures 1-3, the high flame retardant polypropylene composite material consists of 85 parts of polypropylene, 2.5 parts of kaolin, 14 parts of ammonium polyphosphate, 8 parts of dipentaerythritol and 2.5 parts of carbon dots.
In the embodiment of the invention, the kaolin is modified kaolin, and the specific process of the kaolin modification is as follows: mixing and stirring kaolin and water, adding, then adding 2-5% of beta-methoxyethoxysilane, 1-3% of vinyltriethoxysilane and 3-6% of vinyltrimethoxysilane respectively, adding 1-3% of silicone oil, mixing, filtering the mixture, and drying to obtain the modified kaolin, wherein the particle size of the modified kaolin is 1250 meshes. By using the modified kaolin, the fireproof performance can be greatly enhanced, so that the performance of the composite material is greatly improved.
In the embodiment of the invention, the carbon dots are composed of 0.1 part of m-phenylenediamine, 0.1 part of dicyandiamide and 0.3 part of phosphoric acid.
A method for preparing a high flame retardant polypropylene composite material, which comprises the following steps:
step 1: the carbon dots are prepared by taking m-phenylenediamine, dicyandiamide and phosphoric acid as raw materials. 0.1 part of m-phenylenediamine, 0.1 part of dicyandiamide and 1.1 part of phosphoric acid are mixed as raw materials, and different nitrogen-phosphorus co-doped carbon points are prepared through a hydrothermal reaction for 6-24 hours at 120-220 ℃.
Step 2: preparing an intumescent flame retardant system, mixing ammonium polyphosphate, dipentaerythritol and kaolin with the nitrogen-phosphorus co-doped carbon dots in the step 1, and preparing the intumescent flame retardant system under the action of shearing force by using shearing equipment at normal temperature and normal pressure. The mass content of ammonium polyphosphate in the intumescent flame-retardant system is 65%, the mass content of dipentaerythritol is 30%, the mass content of kaolin is 2.5%, and the mass content of N, P-CDs is 2.5%.
Step 3: and (3) mixing polypropylene with the intumescent flame retardant system in the step (2) to prepare the composite material. 75-80wt% of polypropylene and 20-25wt% of an intumescent flame retardant system are mixed, the materials are added into a double screw extruder for extrusion after being uniformly mixed, and then the extruded materials are pelletized to prepare the flame retardant polypropylene composite material.
The carbon point infrared characterization obtained after the reaction of m-phenylenediamine and phosphoric acid serving as raw materials for 12 hours in a high-pressure reaction kettle is shown in figure 1. As shown in FIG. 2, the IFR added into the fixed flame-retardant polypropylene composite material is unchanged at 20wt%, and the influence of different proportions of carbon points and kaolin in the flame retardant system on the flame retardant performance and mechanical function of the flame-retardant composite material is studied.
Table 1: oxygen index and vertical burn rating of composite materials
When the total content of APP and DPER in the IFR is 100%, the LOI of the flame retardant polypropylene composite is 25.9% and cannot be measured by horizontal vertical combustion.
When the total content of APP and DPER in the IFR is 95%, and the carbon point content prepared by taking m-phenylenediamine as a raw material is 5%, the LOI of the flame-retardant polypropylene composite material is 27.7%, and the horizontal and vertical combustion is V-1.
When the total content of APP and DPER in the IFR is 95%, the unmodified kaolin is 5%, the LOI of the flame-retardant polypropylene composite material is 28.3%, and the horizontal vertical combustion is V-2.
When the total content of APP and DPER in the IFR is 95%, the unmodified kaolin and carbon point are 2.5%, respectively, the LOI of the flame-retardant polypropylene composite material is 29.8%, and the horizontal and vertical combustion is V-0.
Fig. 2 is a graph showing the tensile strength and elongation at break data of the composite material, and fig. 3 is a graph showing the flame retardant data of the composite material.
Example 2:
as shown in figures 1-3, the high flame retardant polypropylene composite material consists of 75 parts of polypropylene, 0.5 part of kaolin, 10 parts of ammonium polyphosphate, 4 parts of dipentaerythritol and 0.5 part of carbon dots.
In the embodiment of the invention, the kaolin is modified kaolin, and the specific process of the kaolin modification is as follows: mixing and stirring kaolin and water, adding, then adding 2-5% of beta-methoxyethoxysilane, 1-3% of vinyltriethoxysilane and 3-6% of vinyltrimethoxysilane respectively, adding 1-3% of silicone oil, mixing, filtering the mixture, and drying to obtain the modified kaolin, wherein the particle size of the modified kaolin is 1250 meshes. By using the modified kaolin, the fireproof performance can be greatly enhanced, so that the performance of the composite material is greatly improved.
In the embodiment of the invention, the carbon dots are composed of 0.5 part of m-phenylenediamine, 0.5 part of dicyandiamide and 1.5 parts of phosphoric acid.
A method for preparing a high flame retardant polypropylene composite material, which comprises the following steps:
step 1: the carbon dots are prepared by taking m-phenylenediamine, dicyandiamide and phosphoric acid as raw materials. 0.5 part of m-phenylenediamine, 0.5 part of dicyandiamide and 1.5 parts of phosphoric acid are mixed as raw materials, and different nitrogen-phosphorus co-doped carbon points are prepared through a hydrothermal reaction for 6-24 hours at 120-220 ℃.
Step 2: preparing an intumescent flame retardant system, mixing ammonium polyphosphate, dipentaerythritol and kaolin with the nitrogen-phosphorus co-doped carbon dots in the step 1, and preparing the intumescent flame retardant system under the action of shearing force by using shearing equipment at normal temperature and normal pressure. The mass content of ammonium polyphosphate in the intumescent flame-retardant system is 65%, the mass content of dipentaerythritol is 30%, the mass content of kaolin is 2.5%, and the mass content of N, P-CDs is 2.5%.
Step 3: and (3) mixing polypropylene with the intumescent flame retardant system in the step (2) to prepare the composite material. 75-80wt% of polypropylene and 20-25wt% of an intumescent flame retardant system are mixed, the materials are added into a double screw extruder for extrusion after being uniformly mixed, and then the extruded materials are pelletized to prepare the flame retardant polypropylene composite material.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (1)
1. A high flame retardant polypropylene composite material is characterized in that: consists of 75-85 parts of polypropylene, 0.5-2.5 parts of kaolin, 10-14 parts of ammonium polyphosphate, 4-8 parts of dipentaerythritol and 0.5-2.5 parts of carbon dots;
the kaolin is modified kaolin, and the concrete process of the kaolin modification is as follows: mixing and stirring kaolin and water, then adding, then respectively adding 2-5% of beta-methoxyethoxysilane, 1-3% of vinyltriethoxysilane and 3-6% of vinyltrimethoxysilane, then adding 1-3% of silicone oil, mixing, then filtering the mixture, and drying to obtain modified kaolin, wherein the particle size of the modified kaolin is 1250 meshes;
the carbon point consists of 0.1-0.5 part of m-phenylenediamine, 0.1-0.5 part of dicyandiamide and 0.3-1.5 parts of phosphoric acid;
the preparation method of the high-flame-retardance polypropylene composite material comprises the following steps:
step 1: preparing carbon dots by taking m-phenylenediamine, dicyandiamide and phosphoric acid as raw materials;
step 2: preparing an intumescent flame retardant system;
step 3: mixing polypropylene with the intumescent flame retardant system in the step 2 to prepare a composite material;
the specific process of the step 1 is that 0.5 part of m-phenylenediamine, 0.5 part of dicyandiamide and 1.5 parts of phosphoric acid are mixed as raw materials, and different nitrogen-phosphorus co-doped carbon points are prepared through a hydrothermal method reaction for 6-24 hours at 120-220 ℃;
mixing ammonium polyphosphate, dipentaerythritol and kaolin with the nitrogen-phosphorus co-doped carbon dots in the step 1, and preparing an intumescent flame retardant system under the action of shearing force by using shearing equipment at normal temperature and normal pressure;
in the intumescent flame retardant system, the mass content of ammonium polyphosphate is 65%, the mass content of dipentaerythritol is 25% -32.5%, the mass content of kaolin is 0.5% -5%, and the mass content of nitrogen-phosphorus co-doped carbon points is 0.5% -5%;
the specific process of the step 3 is that 75-80wt% of polypropylene and 20-25wt% of an intumescent flame retardant system are mixed, the materials are added into a double screw extruder for extrusion after being uniformly mixed, and then the extruded materials are pelletized to prepare the flame retardant polypropylene composite material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795219.XA CN115160691B (en) | 2022-07-07 | 2022-07-07 | High-flame-retardance polypropylene composite material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210795219.XA CN115160691B (en) | 2022-07-07 | 2022-07-07 | High-flame-retardance polypropylene composite material and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115160691A CN115160691A (en) | 2022-10-11 |
| CN115160691B true CN115160691B (en) | 2024-02-20 |
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