CN115368716A - Preparation method of efficient flame-retardant plastic - Google Patents
Preparation method of efficient flame-retardant plastic Download PDFInfo
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- CN115368716A CN115368716A CN202211224108.XA CN202211224108A CN115368716A CN 115368716 A CN115368716 A CN 115368716A CN 202211224108 A CN202211224108 A CN 202211224108A CN 115368716 A CN115368716 A CN 115368716A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- 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
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- 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 discloses a preparation method of efficient flame-retardant plastic, belonging to the technical field of functional plastic and comprising the following steps: respectively adding PET resin, modified glass fiber and a toughening agent into a homogenizing and mixing tank, mixing and stirring uniformly, adding ammonium polyphosphate, an antioxidant and a lubricant, mixing and stirring uniformly, and finally heating by a double-screw extruder until the mixture is melted and extruded to obtain the high-efficiency flame-retardant plastic. According to the invention, the glass fiber is modified, and the surface of the glass fiber is grafted with the flexible organic molecular long chain, so that the interface compatibility of the glass fiber and a PET matrix can be improved, and the flexible molecular chain can play a toughening role, thereby improving the mechanical property of the plastic; in addition, the organic molecular chain contains N-P flame-retardant components, so that the flame-retardant property of the plastic can be improved to a certain degree, and the organic molecular chain has a synergistic effect with ammonium polyphosphate, so that the plastic is endowed with high-efficiency flame-retardant property; finally, the plastic with high mechanical property and high flame retardant property is obtained, and has wide application range.
Description
Technical Field
The invention belongs to the technical field of functional plastics, and particularly relates to a preparation method of efficient flame-retardant plastic.
Background
Polyethylene terephthalate (PET) is a linear thermoplastic polymer, can maintain excellent physical properties and mechanical properties in a wider temperature range, has excellent fatigue resistance, aging resistance, electrical insulation and friction resistance, has good processability, is stable to most inorganic acids and organic solvents, is widely applied to the fields of producing fibers, bottle flakes, films, engineering plastics and the like, and has very important influence on industrial production and human life, the limiting combustion oxygen index (LOI) of PET is 20-22%, the PET belongs to a flammable material, is easy to combust to cause fire, generates a large amount of smoke in the combustion process, can suffocate people and animals, and poses serious threat to life. Because of the linear structure characteristics of PET, the PET produces serious molten drops in the combustion process, and the molten drops become a secondary fire ignition source, so that the fire situation is continuously expanded. Therefore, the PET is of great significance for flame retardant modification.
In the prior art, for example, in the patent of invention CN112300543A, zinc hypophosphite and nitrogen flame retardant are added for flame retardant modification, but the system is a fiber-free flame retardant system, the problem of compatibility between the halogen-free flame retardant and glass fiber is not solved, and the fiber-free flame retardant system has low thermal property and physical and mechanical properties, so that the application range of the material is greatly limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of high-efficiency flame-retardant plastic.
According to the invention, the glass fiber is modified, and the surface of the glass fiber is grafted with the flexible organic molecular long chain, so that the interface compatibility of the glass fiber and a PET matrix can be improved, and the flexible molecular chain can play a toughening role, thereby improving the mechanical property of the plastic; in addition, the organic molecular chain contains N-P flame retardant components, so that the flame retardant property of the plastic can be improved to a certain degree, and the organic molecular chain has a synergistic effect with ammonium polyphosphate, so that the plastic is endowed with high-efficiency flame retardant property; finally, the plastic with high mechanical property and high flame retardant property is obtained, and has wide application range.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of high-efficiency flame-retardant plastic comprises the following steps:
firstly, preparing the following raw materials in parts by weight: 100 parts of PET resin, 15-20 parts of modified glass fiber, 12-16 parts of ammonium polyphosphate, 2-3 parts of toughening agent, 1.0-1.2 parts of antioxidant and 1.2-1.4 parts of lubricant;
and secondly, respectively adding PET resin, modified glass fiber and a toughening agent into a homogenizing and mixing tank, mixing and stirring uniformly, adding ammonium polyphosphate, an antioxidant and a lubricant, mixing and stirring uniformly, and finally heating by a double-screw extruder until the mixture is melted and extruded, wherein the melting and extrusion temperature is 240-260 ℃, and the screw rotation speed is 400-500r/min, so as to prepare the high-efficiency flame-retardant plastic.
Further, the toughening agent is POE-g-GMA (glycidyl methacrylate grafted polyolefin elastomer) or ethylene-methyl acrylate-glycidyl methacrylate.
Further, the antioxidant is antioxidant 1010, antioxidant 168 or antioxidant 1098.
Further, the lubricant is pentaerythritol stearate (PETS), polyethylene wax or silicone powder.
Further, the modified glass fiber is prepared by the following steps:
s1, adding glass fiber and n-butyl alcohol into a flask, stirring for 5min, performing ultrasonic treatment for 15min, heating to stabilize the temperature of a system at 90 ℃, slowly dropwise adding a coupling agent solution, stirring and reacting for 6h at the temperature, performing centrifugal separation after the reaction is finished, washing for 3-4 times by using absolute ethyl alcohol, and finally drying a product in a vacuum drying oven at 60 ℃ to obtain pre-modified glass fiber; the dosage ratio of the n-butyl alcohol, the glass fiber and the coupling agent solution is 20mL; the coupling agent solution is prepared by uniformly mixing and stirring a silane coupling agent KH550, deionized water and absolute ethyl alcohol according to a mass ratio of 1;
treating glass fiber by using a silane coupling agent KH550, bonding a molecular chain of the silane coupling agent KH550 on the surface of the glass fiber to obtain a pre-modified glass fiber, wherein the tail end of the bonded molecular chain contains-NH 2 The group lays a reaction site for subsequent reaction;
s2, in N 2 Under the protection, polytetrahydrofuran ether diol and hexamethylene diisocyanate are added into a reactorHeating to 80 ℃ in a four-neck flask of a condensing device, a stirring device and a thermometer to react for 90-100min, adding DBTDL (dibutyltin dilaurate, catalyst), and reacting for 4h at a constant temperature of 80 ℃ to obtain an intermediate 1;
under the action of DBTDL, the-OH at two ends of polytetrahydrofuran ether glycol reacts with the-NCO on a hexamethylene diisocyanate molecule to generate a polyester with the-NCO at two ends, and the reaction process is as follows:
the structural formula of the polytetrahydrofuran ether glycol is HO-R-OH, wherein R is
The molecular weight of the polytetrahydrofuran ether glycol is 2000;
s3, adding 2-carboxyethyl phenyl hypophosphorous acid and acetone into the intermediate 1, continuously stirring and reacting for 2 hours at the constant temperature of 80 ℃, cooling the reaction mixture to room temperature, adding triethylamine and acetone, stirring and treating for 1 hour, and removing the acetone by rotary evaporation after the reaction is finished to obtain an intermediate 2;
the dosage ratio of the polytetrahydrofuran ether glycol, the hexamethylene diisocyanate, the DBTDL, the 2-carboxyethylphenylphosphinic acid, the triethylamine and the acetone in the steps S2 and S3 is 0.1mol; the amount of acetone added in two times is the same;
reacting-NCO at the end of a molecular chain of the intermediate 1 with-OH on a molecule of 2-carboxyethylphenylphosphinic acid, and controlling the molar weight of the 2-carboxyethylphenylphosphinic acid to enable-NCO at one end of the intermediate 1 to participate in the reaction to form an intermediate 2, wherein the reaction process is as follows:
s4, mixing the pre-modified glass fiber and DMF (N, N-dimethylformamide), performing ultrasonic treatment at room temperature for 10min, transferring the mixed solution to a three-neck flask, adding the intermediate 2 into the system, continuing to stir for 1h, then adding EDC-HCl (1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and a coupling agent), transferring the three-neck flask to a water bath at 60 ℃, continuing to stir for reaction for 6h, performing centrifugal separation, washing with DMF and absolute ethyl alcohol sequentially for 4-5 times to remove unreacted substances, and finally putting the product into a vacuum drying oven at 50 ℃ to dry to constant weight to obtain modified glass fiber; the dosage ratio of the pre-modified glass fiber, DMF, intermediate 2 and EDC-HCl is 0.1g;
the surface of the obtained modified glass fiber is grafted with the organic molecular long chain through chemical bonding, on one hand, the organic molecular long chain is grafted, so that the interface compatibility of the glass fiber and a PET matrix can be improved, the uniform dispersion of the glass fiber in the PET can be promoted, the interface bonding performance between the glass fiber and the PET matrix can be improved, the texture uniformity of the material can be improved, and the mechanical property of the plastic can be further improved; the organic molecular long chain is a flexible molecular long chain, ester groups, amide groups, ether bonds and the like contained on the organic molecular long chain can form a hydrogen bond effect with a PET molecular chain, the flexible molecular chain is inserted among the PET molecular chains and generates the hydrogen bond effect with the PET molecular chain, and then the toughening effect can be achieved; on the other hand, the grafted organic molecular chain contains phosphate groups and nitrogen-containing groups, the phosphate groups and the nitrogen-containing groups belong to P-N synergistic flame-retardant components, flame retardance can be realized from multiple layers of condensed phases and gas phases, the flame-retardant components are uniformly distributed in PET along with glass fibers, the flame-retardant performance of the plastic is further improved to a certain degree, and the flame-retardant components can generate a synergistic effect with ammonium polyphosphate to endow the PET plastic with efficient flame-retardant characteristics.
The invention has the beneficial effects that:
according to the invention, the glass fiber is modified, and the surface of the glass fiber is grafted with the flexible organic molecular long chain, so that the interface compatibility of the glass fiber and a PET matrix can be improved, and the flexible molecular chain can play a toughening role, thereby improving the mechanical property of the plastic; in addition, the organic molecular chain contains N-P flame retardant components, so that the flame retardant property of the plastic can be improved to a certain degree, and the organic molecular chain has a synergistic effect with ammonium polyphosphate, so that the plastic is endowed with high-efficiency flame retardant property; finally, the plastic with high mechanical property and high flame retardant property is obtained, and has wide application range.
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.
Example 1
Preparing modified glass fiber:
s1, adding 10g of glass fiber and 200mL of n-butanol into a flask, stirring for 5min, then performing ultrasonic treatment for 15min, heating to stabilize the temperature of a system at 90 ℃, slowly dropwise adding 80mL of a coupling agent solution, stirring and reacting for 6h at the temperature, performing centrifugal separation after the reaction is finished, washing for 3 times by using absolute ethyl alcohol, and finally drying the product in a vacuum drying oven at 60 ℃ to obtain pre-modified glass fiber; the coupling agent solution is prepared by uniformly mixing and stirring a silane coupling agent KH550, deionized water and absolute ethyl alcohol according to a mass ratio of 1;
s2 in N 2 Adding 0.1mol of polytetrahydrofuran ether glycol and 0.2mol of hexamethylene diisocyanate into a four-neck flask provided with a condensing device, a stirring device and a thermometer under protection, heating to 80 ℃ for reaction for 90min, adding 1.8g of DBTDL (dibutyltin dilaurate, catalyst), and reacting for 4h at the constant temperature of 80 ℃ to obtain an intermediate 1;
s3, adding 21.4g of 2-carboxyethylphenylphosphinic acid and 300mL of acetone into the intermediate 1, continuing stirring and reacting for 2h at the constant temperature of 80 ℃, cooling the reaction mixture to room temperature, adding 10.1g of triethylamine and 300mL of acetone, stirring and treating for 1h, and removing the acetone by rotary evaporation after the reaction is finished to obtain an intermediate 2;
s4, mixing 1g of pre-modified glass fiber with 300mL of DMF (N, N-dimethylformamide), performing ultrasonic treatment at room temperature for 10min, transferring the mixed solution into a three-neck flask, adding 200g of intermediate 2 into the system, continuing to stir for 1h, then adding 60mg of EDC-HCl (1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and a coupling agent), transferring the three-neck flask into a water bath at 60 ℃, continuing to stir for reaction for 6h, performing centrifugal separation, washing for 4 times by using DMF and absolute ethyl alcohol in sequence to remove unreacted substances, and finally, putting the product into a vacuum drying oven at 50 ℃ to dry to constant weight to obtain the modified glass fiber.
Example 2
Preparing modified glass fiber:
s1, adding 2g of glass fiber and 40mL of n-butanol into a flask, stirring for 5min, then carrying out ultrasonic treatment for 15min, heating to stabilize the temperature of a system at 90 ℃, slowly dropwise adding 16mL of a coupling agent solution, stirring and reacting for 6h at the temperature, after the reaction is finished, carrying out centrifugal separation, washing for 4 times by using absolute ethyl alcohol, and finally drying the product in a vacuum drying oven at 60 ℃ to obtain pre-modified glass fiber; the coupling agent solution is prepared by uniformly mixing and stirring a silane coupling agent KH550, deionized water and absolute ethyl alcohol according to a mass ratio of 1;
s2 in N 2 Adding 0.2mol of polytetrahydrofuran ether glycol and 0.4mol of hexamethylene diisocyanate into a four-neck flask provided with a condensing device, a stirring device and a thermometer under protection, heating to 80 ℃, reacting for 90-100min, adding 3.6g of DBTDL (dibutyltin dilaurate, catalyst), and reacting for 4h at the constant temperature of 80 ℃ to obtain an intermediate 1;
s3, adding 42.8g of 2-carboxyethylphenylphosphinic acid and 600mL of acetone into the intermediate 1, continuously stirring and reacting for 2h at the constant temperature of 80 ℃, cooling the reaction mixture to room temperature, adding 20.2g of triethylamine and 600mL of acetone, stirring and treating for 1h, and removing the acetone by rotary evaporation after the reaction is finished to obtain an intermediate 2;
s4, mixing 2g of pre-modified glass fiber with 600mL of DMF (N, N-dimethylformamide), performing ultrasonic treatment at room temperature for 10min, transferring the mixed solution into a three-neck flask, adding 400g of intermediate 2 into the system, continuing to stir for 1h, then adding 120mg of EDC-HCl (1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and a coupling agent), transferring the three-neck flask into a water bath at 60 ℃, continuing to stir for reaction for 6h, performing centrifugal separation, washing with DMF and absolute ethyl alcohol for 5 times in sequence to remove unreacted substances, and finally, putting the product into a vacuum drying oven at 50 ℃ to dry to constant weight to obtain the modified glass fiber.
Example 3
A preparation method of high-efficiency flame-retardant plastic comprises the following steps:
firstly, preparing the following raw materials in parts by weight: 100 parts of PET resin, 15 parts of modified glass fiber prepared in example 1, 12 parts of ammonium polyphosphate, 2 parts of POE-g-GMA, 10101.0 parts of antioxidant and 1.2 parts of pentaerythritol stearate;
and secondly, respectively adding PET resin, modified glass fiber and POE-g-GMA into a mixing tank, mixing and stirring uniformly, adding ammonium polyphosphate, antioxidant 1010 and pentaerythritol stearate, mixing and stirring uniformly, and finally heating by a double-screw extruder until the mixture is melted and extruded at the temperature of 240 ℃ and the rotating speed of a screw of 400r/min to prepare the efficient flame-retardant plastic.
Example 4
A preparation method of high-efficiency flame-retardant plastic comprises the following steps:
firstly, preparing the following raw materials in parts by weight: 100 parts of PET resin, 17.5 parts of modified glass fiber prepared in example 2, 14 parts of ammonium polyphosphate, 2.5 parts of ethylene-methyl acrylate-glycidyl methacrylate, 1681.1 parts of antioxidant and 1.3 parts of polyethylene wax;
and secondly, respectively adding PET resin, modified glass fiber and ethylene-methyl acrylate-glycidyl methacrylate into a uniform mixing tank, uniformly mixing and stirring, adding ammonium polyphosphate, antioxidant 168 and polyethylene wax, uniformly mixing and stirring, and finally heating by a double-screw extruder until the mixture is melted and extruded, wherein the melting and extrusion temperature is 250 ℃, and the rotating speed of a screw is 450r/min, so as to prepare the high-efficiency flame-retardant plastic.
Example 5
A preparation method of high-efficiency flame-retardant plastic comprises the following steps:
firstly, preparing the following raw materials in parts by weight: 100 parts of PET resin, 20 parts of modified glass fiber prepared in example 1, 16 parts of ammonium polyphosphate, 3 parts of POE-g-GMA, 81.2 parts of antioxidant and 1.4 parts of silicone powder;
and secondly, respectively adding PET resin, modified glass fiber and POE-g-GMA into a homogenizing and mixing tank, uniformly mixing and stirring, adding ammonium polyphosphate, antioxidant 1098 and silicone powder, uniformly mixing and stirring, and finally heating by a double-screw extruder until the mixture is melted and extruded, wherein the melting and extrusion temperature is 260 ℃, and the screw rotation speed is 500r/min, so that the efficient flame-retardant plastic is prepared.
Comparative example
The modified glass fiber in example 3 was replaced with a common glass fiber, and the remaining raw materials and preparation process were unchanged.
The plastics obtained in examples 3 to 5 and comparative example were cut into test specimens and subjected to the following performance tests:
tensile property: testing according to GB/T1040.1-2018K part 1 of the determination of tensile property of plastics, general rules;
the impact property is tested according to the GB/T1843-2008 'determination of the impact strength of the plastic cantilever beam';
testing the thermal deformation temperature according to ISO75-2004, wherein the load is 1.80MPa, and the heating rate is 2 ℃/min;
limiting oxygen index test (LOI): according to the oxygen index method of the test method of the combustion performance of the plastic (GB/T2406), a flat vulcanizing instrument is adopted to heat, melt and tablet the plastic, and then a critical oxygen index analyzer is used for testing to obtain the limit oxygen index of the sample;
vertical burning test: according to the flame retardant property experimental method-vertical burning method (GB 240984), fixing the sample strip at a position 30.0cm away from a base, placing absorbent cotton with the thickness of 0.5cm at the base, continuously acting a fire source on the lower part of the sample strip for 10s, and acting for 10s after the sample strip is extinguished, recording an experimental phenomenon, and comparing the experimental phenomenon with the plastic burning property test-horizontal method and the vertical method (GB/T2408-2008);
the results obtained are shown in the following table:
the data in the table show that the PET plastic obtained by the invention has good mechanical property and flame retardant property, and the data of the comparative example show that the glass fiber is modified and then the surface of the glass fiber is introduced with a flexible organic molecular chain, so that the interface compatibility of the glass fiber and the PET can be improved, the toughening effect can be achieved, and the mechanical property of the plastic can be effectively improved; and the glass fiber can be introduced with N-P flame-retardant components through modification, and has a synergistic effect with ammonium polyphosphate, so that the flame-retardant effect of the plastic is effectively improved.
In the description of the specification, reference to the description of "one embodiment," "an example," "a specific example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (8)
1. The preparation method of the efficient flame-retardant plastic is characterized by comprising the following steps:
firstly, preparing the following raw materials in parts by weight: 100 parts of PET resin, 15-20 parts of modified glass fiber, 12-16 parts of ammonium polyphosphate, 2-3 parts of toughening agent, 1.0-1.2 parts of antioxidant and 1.2-1.4 parts of lubricant;
and secondly, respectively adding PET resin, modified glass fiber and a toughening agent into a homogenizing and mixing tank, mixing and stirring uniformly, adding ammonium polyphosphate, an antioxidant and a lubricant, mixing and stirring uniformly, and finally heating by a double-screw extruder until the mixture is melted and extruded to prepare the high-efficiency flame-retardant plastic.
2. The method for preparing high-efficiency flame-retardant plastic according to claim 1, wherein the toughening agent is POE-g-GMA or ethylene-methyl acrylate-glycidyl methacrylate.
3. The method for preparing high-efficiency flame-retardant plastic according to claim 1, wherein the lubricant is pentaerythritol stearate, polyethylene wax or silicone powder.
4. The method for preparing high-efficiency flame-retardant plastic according to claim 1, wherein the melt extrusion temperature in the second step is 240-260 ℃ and the screw rotation speed is 400-500r/min.
5. The preparation method of the efficient flame retardant plastic as claimed in claim 1, wherein the modified glass fiber is prepared by the following steps:
s1, adding glass fiber and n-butyl alcohol into a flask, stirring for 5min, performing ultrasonic treatment for 15min, heating to stabilize the temperature of a system at 90 ℃, slowly dropwise adding a coupling agent solution, stirring and reacting for 6h at the temperature, performing centrifugal separation after the reaction is finished, washing for 3-4 times by using absolute ethyl alcohol, and finally drying a product in a vacuum drying oven at 60 ℃ to obtain pre-modified glass fiber;
s2, in N 2 Adding polytetrahydrofuran ether glycol and hexamethylene diisocyanate into a four-neck flask provided with a condensing device, a stirring device and a thermometer under protection, heating to 80 ℃, reacting for 90-100min, adding DBTDL, and reacting for 4h at the constant temperature of 80 ℃ to obtain an intermediate 1;
s3, adding 2-carboxyethyl phenyl hypophosphorous acid and acetone into the intermediate 1, continuously stirring and reacting for 2 hours at the constant temperature of 80 ℃, cooling the reaction mixture to room temperature, adding triethylamine and acetone, stirring and treating for 1 hour, and removing the acetone by rotary evaporation after the reaction is finished to obtain an intermediate 2;
and S4, mixing the pre-modified glass fiber and DMF, performing ultrasonic treatment at room temperature for 10min, transferring the mixed solution into a three-neck flask, adding the intermediate 2 into the system, continuing stirring for 1h, then adding EDC-HCl, transferring the three-neck flask into a water bath at 60 ℃, continuing stirring for reaction for 6h, performing centrifugal separation, washing for 4-5 times by using DMF and absolute ethyl alcohol in sequence to remove unreacted substances, and finally, putting the product into a vacuum drying oven at 50 ℃ to dry to constant weight to obtain the modified glass fiber.
6. The preparation method of efficient flame retardant plastic as claimed in claim 5, wherein in step S1, the dosage ratio of n-butanol, glass fiber and coupling agent solution is 20mL; the coupling agent solution is prepared by uniformly mixing and stirring a silane coupling agent KH550, deionized water and absolute ethyl alcohol according to a mass ratio of 1.
7. The preparation method of the high-efficiency flame-retardant plastic is characterized in that the dosage ratio of the polytetrahydrofuran ether glycol, the hexamethylene diisocyanate, the DBTDL, the 2-carboxyethylphenylhypophosphorous acid, the triethylamine and the acetone in the steps S2 and S3 is 0.1mol; the amount of acetone added in two times is the same.
8. The method for preparing high-efficiency flame-retardant plastic according to claim 5, wherein the ratio of the pre-modified glass fiber, DMF, intermediate 2, EDC-HCl used in step S4 is 0.1g.
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| CN116253951A (en) * | 2023-02-20 | 2023-06-13 | 江苏骅腾电力科技有限公司 | Flame-retardant polypropylene plastic |
| CN117534945A (en) * | 2023-12-12 | 2024-02-09 | 中山市乐力隆工程塑料有限公司 | Multifunctional engineering plastic and production method thereof |
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| CN107117833A (en) * | 2017-05-14 | 2017-09-01 | 常州力纯数码科技有限公司 | A kind of preparation method of glass fiber infiltration agent |
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| CN115785678A (en) * | 2022-12-12 | 2023-03-14 | 安徽省杰事途新材料有限公司 | Method for preparing modified polypropylene resin by recycling glass fiber |
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