CN112321988B - High glow wire polyformaldehyde composition and preparation method and application thereof - Google Patents
High glow wire polyformaldehyde composition and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2359/00—Characterised by the use of polyacetals containing polyoxymethylene sequences only
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
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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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
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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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
Abstract
The invention discloses a high glow wire polyformaldehyde composition which comprises the following components in parts by weight: 40-60 parts of POM resin, 40-55 parts of flame retardant master batch, 0.5-2 parts of lubricant, 0.1-0.5 part of main antioxidant and 0.1-0.3 part of auxiliary antioxidant; the flame retardant master batch comprises the following components in percentage by weight: 21-32% of thermoplastic polyurethane elastomer, 50-70% of ammonium polyphosphate and 9-18% of melamine cyanurate, wherein the Shore A hardness of the thermoplastic polyurethane elastomer is 75-95A. The invention adopts TPU with Shore A hardness of 75-95A to coat APP and MCA to form flame retardant master batches, and then co-extrudes the flame retardant master batches and the POM, so that the deterioration of the POM by the flame retardant is effectively reduced, and the POM material with better mechanical property and higher glowing filament flammability index is obtained, and is suitable for low-voltage electrical appliance products requiring high glowing filament and high mechanical property, such as: double-end connecting pin, installation card.
Description
Technical Field
The invention belongs to the technical field of engineering plastics, and particularly relates to a high glow-wire polyformaldehyde composition as well as a preparation method and an application thereof.
Background
Polyoxymethylene (POM) is an engineering plastic with excellent properties, hardness, strength and rigidity similar to metals, good self-lubricity, good fatigue resistance, and elasticity in a wide temperature and humidity range, and also has good chemical resistance. At present, POM is replacing some markets traditionally occupied by metal, such as replacing many parts made of zinc, brass, aluminum and steel, at a lower cost than many other engineering plastics, and has been widely used in the fields of electronics, electricity, machinery, instruments, daily light industry, automobiles, building materials, agriculture and the like.
However, POM resins have a low oxygen index (14.9%), resulting in very easy burning and melt dripping; meanwhile, the glowing filament flammability index of the POM resin is low, the GWFI2.0mm is only 600 ℃, and the situation with higher requirements on the GWFI cannot be met. For example, products such as double-end connecting pins, mounting cards and the like in low-voltage electrical appliances require high glow wires, require 650 ℃ for GWFI2.0mm, and simultaneously require good mechanical properties, and have the impact strength of 6.5KJ/m2The tensile strength is 25MPa or more. And because the POM resin is a high-crystallinity polymer and has poor compatibility with other additives, the mechanical properties, especially the toughness of the material are obviously reduced by adding a large amount of the flame retardant.
Therefore, how to obtain a POM material with high glow wire and good mechanical properties has become a technical problem which needs to be solved urgently at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a high glow-wire polyformaldehyde composition as well as a preparation method and application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a high glow wire polyformaldehyde composition comprises the following components in parts by weight: 40-60 parts of POM resin, 40-55 parts of flame retardant master batch, 0.5-2 parts of lubricant, 0.1-0.5 part of main antioxidant and 0.1-0.3 part of auxiliary antioxidant.
Preferably, the flame retardant master batch comprises the following components in percentage by weight: 21% -32% of thermoplastic polyurethane elastomer (TPU), 50% -70% of ammonium polyphosphate (APP) and 9% -18% of Melamine Cyanurate (MCA), wherein the Shore A hardness of the TPU is 75-95A.
The TPU with Shore A hardness of 75-95A has good compatibility with POM resin, the mechanical property, especially the toughness of the composition can be effectively improved, APP and MCA are coated by the TPU to form flame retardant master batches, and then the flame retardant master batches and the POM are co-extruded, so that the deterioration effect of the APP and MCA on the POM can be effectively reduced, and the composition material with good mechanical property and high glowing filament flammability index can be obtained. All in oneWhen the ammonium polyphosphate is heated in the air, the ammonium polyphosphate is firstly oxidized into P2O5Then phosphoric acid, metaphosphoric acid and pyrophosphoric acid are generated, and the substances can dehydrate and form carbon positive ions on polyurethane into carbon, and the carbon layer is nonflammable and can cover and surround the polymer, so that flame and oxygen in the air are isolated, and the flame retardant effect is achieved, therefore, the TPU can also be used as a carbon forming agent in the system of the invention and is matched with APP to further improve the flame retardant property of the composition.
It has been found that if the hardness of the TPU is too high, its use as a coating layer, due to its low elongation and toughness, leads to poor mechanical properties of the composition, especially toughness. If the hardness of the TPU is too small, the hardness is low, and the coating layer increases the toughness of the composition, but the tensile strength of the composition is greatly reduced.
In addition, compared with only coating APP, the coating of APP and MCA simultaneously has better flame retardant effect, because MCA has a carbon forming effect and can play a better flame retardant modification effect when being matched with APP.
Preferably, the flame retardant master batch comprises the following components in percentage by weight: TPU 28%, APP 60% and MCA 12%. The flame retardant master batch using the formula has good comprehensive mechanical properties.
Preferably, the phosphorus content of the APP is 27% to 32%. The phosphorus content determines the effect of APP on improving the performance of the glow wire of the composition; lower phosphorus levels of APP result in the need to add more APP to effectively increase the glow wire flammability index of the composition, but adding more APP adversely affects the mechanical properties of the composition. In the invention, the phosphorus content of APP is determined according to GB/T10512-2008 < weight method for determining the phosphorus content in nitrophosphate fertilizer >.
Preferably, the melt index of the POM resin under the test condition of 190 ℃ and 2.16kg is 1-50 g/10 min; the density is 1.38 to 1.43g/cm3。
Preferably, the lubricant is an amide-based lubricant; more preferably at least one of erucamide, TAF (modified ethylene bis fatty acid amide), and EBS B50(N, N' -ethylene bis stearamide); most preferred is erucamide. The research shows that in a low-formaldehyde and low-odor POM system (the formula comprises 97.2 parts by weight of POM resin, 2 parts by weight of amide lubricant, 2 parts by weight of primary antioxidant IRGANOX 2450.3 parts by weight of secondary antioxidant SONOX 1680.2 parts by weight of and 0.3 part by weight of sodium bisulfite), erucamide is used as the lubricant, so that the composition has higher stability. Experiments show that under the condition that the adding amount of the lubricant is 2 parts by weight, the formaldehyde emission of the composition added with the erucamide is about 1ppm (VDA275), and the formaldehyde emission of the composition added with the TAF or EBS B50 is about 3ppm (VDA275), so the erucamide is preferably used as the lubricant in the invention.
Preferably, the primary antioxidant is a hindered phenolic antioxidant, such as: basf IRGANOX 245, bis [3- (1, 1-dimethylethyl) -4-hydroxy-5-methylpropanoic acid ] tripeleneglycol, and the like.
Preferably, the auxiliary antioxidant is at least one selected from phosphite antioxidants (such as tris (2, 4-di-tert-butylphenyl) phosphite) and thioether antioxidants (such as pentaerythritol tetrakis (3-laurylthiopropionate)).
The high glow wire polyformaldehyde composition is suitable for low-voltage appliances, and can meet the requirements that the GWFI2.0mm required by low-voltage appliance products reaches 650 ℃, and the impact strength is 6.5KJ/m2As described above, the tensile strength is required to be 25MPa or more.
The invention also provides a preparation method of the high glow-wire polyformaldehyde composition, which comprises the following steps:
(1) adding the POM resin, the flame retardant master batch, the lubricant, the main antioxidant and the auxiliary antioxidant into a high-speed mixer together, and mixing for 2-5 min to obtain a premix;
(2) and (3) melting and extruding the premix material through a double-screw extruder at 160-200 ℃, cooling and granulating to obtain the polyformaldehyde composition.
Wherein, the temperature of each screw cylinder from the charging opening to the machine head of the double-screw extruder is respectively as follows: 150-170 ℃, 160-180 ℃, 170-190 ℃, 180-200 ℃ and 180-200 ℃, the screw rotation speed is 250-400 r/min, the feeding amount is 50-200 kg/h, and the vacuum degree is-0.1-0 MPa.
The invention also provides a preparation method of the flame retardant master batch, which comprises the following steps: adding the TPU, the APP and the MCA into a high-speed mixer together, and mixing for 2-5 min to obtain a premix; and (3) melting and extruding the premix material at 160-200 ℃ by a double-screw extruder, cooling and granulating to obtain the flame retardant master batch.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts TPU with Shore A hardness of 75-95A to coat APP and MCA to form flame retardant master batches, and then co-extrudes the flame retardant master batches and the POM, so that the deterioration of the POM by the flame retardant is effectively reduced, and the POM material with better mechanical property and higher glowing filament flammability index is obtained, and is suitable for low-voltage electrical appliance products requiring high glowing filament and high mechanical property, such as: double-end connecting pin, installation card.
Detailed Description
The technical solutions of the present invention will be further described with reference to the following embodiments, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all 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 starting materials used in the examples and comparative examples were all commercially available, wherein:
1. the flame retardant master batch is prepared from the following components in percentage by weight:
TPU KF-85AG (Iris Overflow, Inc., Shore A hardness 85A): 28%, ammonium polyphosphate APP: 60%, and melamine cyanurate MCA: 12 percent.
2. The flame retardant master batch is prepared from the following components in percentage by weight:
PolyBlend 1100-45A (AdvanSource Biomaterials Corp, Shore A hardness 45A): 28%, ammonium polyphosphate APP: 60%, and melamine cyanurate MCA: 12 percent.
3. The flame retardant master batch is prepared from the following components in percentage by weight:
mirakutoran TPU 574(Mirakutoran, Shore D hardness 74D): 28% and ammonium polyphosphate APP: 60%, and melamine cyanurate MCA: 12 percent.
The flame retardant master batch I, the flame retardant master batch II and the flame retardant master batch III use ammonium polyphosphate APP and melamine cyanurate MCA as the same products.
Wherein, the phosphorus content of the ammonium polyphosphate APP is 27-32%, the ammonium polyphosphate APP is purchased from the chemical industry Co., Ltd of Shouguangyantong, the model is APP101 (the phosphorus content of the APP101 is 27-29%), and in addition, APP102 (the phosphorus content of the APP102 is 31-32%) produced by the company can also be adopted;
the purity of the melamine cyanurate MCA is more than or equal to 99.5 percent, the pH value is 5.0-7.5, and the melamine cyanurate MCA is purchased from Sichuan province fine chemical research and design institute and is of the type MCA-01;
4. POM resin is available from Yunnan Tiantianhua GmbH, model number POM M270, and has a melt index of 27g/10min (190 deg.C/2.16 kg) and a density of 1.4g/cm3；
5. Amide-based lubricants: erucamide, available from mitsunpu chemical (sichuan) ltd, model number: crodamide ER-CH-MB- (SI), chemical name: (cis) -13-eicosadienoamide;
6. silicone-based lubricants: MB50-002, available from Guangzhou Congress chemical Co., Ltd, silicone master batch;
7. stearic acid type lubricants: CALCIUM STEARATE (BS-3818), available from Bailey chemical Co., Ltd;
8. stearic acid-based lubricants: ZINC STEARATE (BS-2818), available from walleye chemical materials science and technology ltd, zhongshan;
9. the main antioxidant is bis [3- (1, 1-dimethylethyl) -4-hydroxy-5-methylpropanoic ] triethylene glycol which is purchased from Authening trade company, Inc. of Guangzhou, and has the model of IRGANOX 245;
10. the auxiliary antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite available from Yuansheng chemical Co., Ltd, Fushan City, and is SONOX 168.
The preparation method of the flame retardant master batch comprises the following steps: adding the TPU, the APP and the MCA into a high-speed mixer together, and mixing for 2-5 min to obtain a premix; and (3) melting and extruding the premix material at 160-200 ℃ by a double-screw extruder, cooling and granulating to obtain the flame retardant master batch. Wherein, the temperature of each screw cylinder from the charging opening to the machine head of the double-screw extruder is respectively as follows: 150-170 ℃, 160-180 ℃, 170-190 ℃, 180-200 ℃, the screw rotation speed is 250-400 r/min, the feeding amount is 50-200 kg/h, and the vacuum degree is-0.1-0 MPa.
Performance test standard:
glow wire GWFI: the test standard IEC 60695-2-12:2014, the thickness of the sample plate is 2.0 mm;
tensile strength: test standard ISO 527-2:2012, test speed 50 mm/min;
notched impact strength: test standard ISO 180:2013, pendulum energy 2.75J;
extrusion pelletizability: observing the particle condition in the extrusion process, wherein the surface of the normal particle is intact, 1-2 vacuum holes are arranged in the middle, and no crushing is performed; the expanded particles are in the form of expanded or crushed particles.
The formulations of the polyoxymethylene compositions of examples 1 to 4 and comparative examples 1 to 10 are shown in Table 1, and the preparation method is as follows:
(1) adding the raw material components into a high-speed mixer together, and mixing for 2-5 min to obtain a premix;
(2) adding the premix into a double-screw extruder from a main feeding port, adding the glass fiber into the double-screw extruder from a side feeding port, and performing melt extrusion, cooling and granulation at 160-200 ℃ to obtain the polyformaldehyde composition; wherein, the temperature of each screw cylinder from the charging opening to the machine head of the double-screw extruder is respectively as follows: 150-170 ℃, 160-180 ℃, 170-190 ℃, 180-200 ℃ and 180-200 ℃, the screw rotation speed is 250-400 r/min, the feeding amount is 50-200 kg/h, and the vacuum degree is-0.1-0 MPa.
The polyoxymethylene compositions of examples 1 to 4 and comparative examples 1 to 10 were prepared into samples according to the above-mentioned performance test standards and tested for the relevant performance, and the test results are shown in table 1.
TABLE 1
TABLE 1 (continuation)
| Component (parts by weight) | Comparative example 8 | Comparative example 9 | Comparative example 10 |
| POM | 53.5 | 53.5 | 53.5 |
| Fire retardant master batch | 45 | 45 | 45 |
| MB50-002 | 1 | - | - |
| CALCIUM STEARATE(BS-3818) | - | 1 | - |
| ZINC STEARATE(BS-2818) | - | - | 1 |
| Primary antioxidant | 0.3 | 0.3 | 0.3 |
| Secondary antioxidant | 0.2 | 0.2 | 0.2 |
| GWFI 2.0mm | 650 | 650 | 650 |
| Tensile strength MPa | 25.5 | 22.4 | 21.6 |
| Notched impact strength KJ/m2 | 3.5 | 3.2 | 3.4 |
| Extrusion pelletizability | Foaming | Foaming and changing color | Foaming and changing color |
Note: in the table, "-" indicates that the raw material was not added.
And (4) analyzing results:
comparing examples 1-4 with comparative examples 1-2, it can be seen that in the formula system of the invention, the addition amount of the POM and the flame retardant master batch can affect the mechanical property and glow wire flammability index of the composition. The composition prepared in the addition amount range provided by the invention has good mechanical property, high tensile strength and notch impact strength, and GWFI2.0mm reaches 650 ℃. If the proportion of the POM is too large and the proportion of the flame retardant master batch is too small, the GWFI2.0mm of the composition is only 600 ℃, and the toughness is lower. If the ratio of POM is too small and the ratio of flame retardant masterbatch is too large, the tensile strength of the composition is significantly reduced.
Comparing example 3, comparative examples 3 to 4 and comparative example 7, it can be seen that if the coating layer TPU of the flame retardant master batch is replaced with the TPU having a smaller hardness (i.e., comparative example 3), although the toughness (notch impact strength) of the composition is improved, the tensile strength is significantly reduced, and the mechanical property requirements of the low-voltage electrical appliance cannot be met. When the coating layer TPU of the flame retardant master batch is replaced with the TPU with higher hardness (namely, comparative example 4), the tensile strength and the notch impact strength of the composition are both remarkably reduced. In the comparative example 7 without adding the flame retardant master batch, the tensile strength of the composition is improved compared with that of the composition in the example 3, but the notch impact strength is obviously reduced, and the GWFI2.0mm is only 600 ℃, which shows that the addition of the flame retardant master batch can effectively improve the glowing wire flammability index of the composition, and simultaneously, the flame retardant master batch contains the TPU with the hardness, so that the toughness of the composition can be obviously improved, but the tensile strength of the composition can be reduced by adding any TPU, and the composition obtained by the formula of the invention has higher glowing wire flammability index and toughness, and the tensile strength can also meet the requirements of low-voltage electric appliances.
Comparing example 2 with comparative examples 5 to 6, it can be seen that the addition of TPU, APP and MCA directly to the composition without pre-coating results in a significant reduction in the mechanical properties of the composition, especially toughness, due to the cracking effect of APP and MCA on POM.
Comparing example 2 with comparative examples 8-10, it can be seen that amide lubricants such as erucamide have good stabilizing effect on the system, and can ensure that the extrusion process is smoothly performed, and the extruded particles are normal, but if the amide lubricants are replaced by other types of lubricants such as silicone lubricant MB50-002, stearic acid lubricant CALCIUM STEARATE (BS-3818), or ZINC STEARATE (BS-2818), the extruded particles are severely foamed, and the stearic acid lubricant also changes the color of the system.
Second, the influence of the component proportion of the flame retardant master batch on the performance of the composition is researched, and test groups 1-3 in table 2 are set. The flame retardant master batches were prepared according to the weight percentage formulations of test groups 1-3, the polyoxymethylene compositions were prepared according to the formulation and method of example 1, and the properties of the polyoxymethylene compositions prepared using the flame retardant master batches of each test group were examined, with the results shown in table 3.
TABLE 2
| Component (a) of | Test group 1 | Test group 2 | Test group 3 |
| TPU KF-85AG | 32 | 28 | 21 |
| APP101 | 50 | 60 | 70 |
| MCA-01 | 18 | 12 | 9 |
TABLE 3
| Components | Test group 1 | Test group 2 | Test group 3 |
| GWFI 2.0mm | 650 | 650 | 650 |
| Tensile strength MPa | 35.8 | 41.2 | 36.2 |
| Notched impact strength KJ/m2 | 8.9 | 8.4 | 7.1 |
As can be seen from Table 3, the change of the component proportion in the flame retardant master batch of the invention has an influence on the mechanical properties of the composition, while the composition added with the flame retardant master batch of the test group 2 has better comprehensive mechanical properties.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The high glow-wire polyformaldehyde composition is characterized by comprising the following components in parts by weight: 40-60 parts of POM resin, 40-55 parts of flame retardant master batch, 0.5-2 parts of lubricant, 0.1-0.5 part of main antioxidant and 0.1-0.3 part of auxiliary antioxidant; the flame retardant master batch comprises the following components in percentage by weight: 21-32% of a thermoplastic polyurethane elastomer, 50-70% of ammonium polyphosphate and 9-18% of melamine cyanurate, wherein the Shore A hardness of the thermoplastic polyurethane elastomer is 75-95A; the lubricant is an amide lubricant.
2. The high glow wire polyoxymethylene composition of claim 1, wherein said flame retardant masterbatch comprises the following components in weight percent: 28% of thermoplastic polyurethane elastomer, 60% of ammonium polyphosphate and 12% of melamine cyanurate.
3. The high glow wire polyoxymethylene composition of claim 1, wherein said ammonium polyphosphate has a phosphorous content of 27% to 32%.
4. The high glow wire polyoxymethylene composition of claim 1, wherein said POM resin has a melt index of 2.16kg at 190 ℃1-50 g/10 min; the density is 1.38 to 1.43g/cm3。
5. The high glow wire polyoxymethylene composition of claim 1, wherein said lubricant is at least one of erucamide, TAF, EBS B50.
6. The high glow wire polyoxymethylene composition of claim 1, wherein said primary antioxidant is a hindered phenolic antioxidant.
7. The high glow wire polyoxymethylene composition of claim 1, wherein said secondary antioxidant is at least one selected from the group consisting of phosphite antioxidants and thioether antioxidants.
8. The process for preparing a high glow-wire polyoxymethylene composition according to any of claims 1 to 7, comprising the steps of:
(1) adding the POM resin, the flame retardant master batch, the lubricant, the main antioxidant and the auxiliary antioxidant into a high-speed mixer together, and mixing for 2-5 min to obtain a premix;
(2) carrying out melt extrusion, cooling and granulation on the premix through a double-screw extruder at 160-200 ℃ to obtain a polyformaldehyde composition;
the preparation method of the flame retardant master batch comprises the following steps: adding the thermoplastic polyurethane elastomer, ammonium polyphosphate and melamine cyanurate into a high-speed mixer together, and mixing for 2-5 min to obtain a premix; and (3) carrying out melt extrusion, cooling and granulation on the premix through a double-screw extruder at 160-200 ℃ to obtain the flame retardant master batch.
9. Use of the high glow-wire polyoxymethylene composition according to any of claims 1 to 7 in a low voltage electrical appliance.
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| CN114507441A (en) * | 2021-12-24 | 2022-05-17 | 金发科技股份有限公司 | Polyamide composite material and preparation method and application thereof |
| CN115260739B (en) * | 2022-08-08 | 2023-08-15 | 上海鑫亘环保科技有限公司 | TPU flame-retardant master batch, TPU film and preparation method and application thereof |
| CN115260700A (en) * | 2022-08-26 | 2022-11-01 | 万敬新材料(上海)有限公司 | Low-temperature toughened polyformaldehyde composition and manufacturing method thereof |
| CN115304843B (en) * | 2022-08-26 | 2023-08-04 | 扬州绿宝人造草坪有限公司 | High-strength flame-retardant artificial grass filaments |
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| CN100341940C (en) * | 2006-03-08 | 2007-10-10 | 四川大学 | Prepn of polyformaldehyde material with polyurethane-base composite fire retardant |
| CN103435966A (en) * | 2012-12-19 | 2013-12-11 | 安徽科聚新材料有限公司 | Polyformaldehyde material and preparation method thereof |
| CN104312085B (en) * | 2014-10-30 | 2016-08-24 | 山西新华化工有限责任公司 | Fire-retardant corrosion-resistant gas mask canister plinth POM plastic formula and preparation method |
| CN106366558A (en) * | 2016-09-30 | 2017-02-01 | 无锡市明盛强力风机有限公司 | Engineering plastic material and preparation method |
| CN110607066B (en) * | 2019-10-09 | 2021-12-28 | 江苏万纳普新材料科技有限公司 | Special halogen-free flame-retardant synergistic functional master batch for modifying polyformaldehyde and preparation method thereof |
| CN111635613B (en) * | 2020-05-11 | 2023-05-12 | 天津金发新材料有限公司 | Super-tough and wear-resistant POM/TPU composition and preparation method thereof |
| CN112321988B (en) * | 2020-11-09 | 2022-05-06 | 金发科技股份有限公司 | High glow wire polyformaldehyde composition and preparation method and application thereof |
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- 2020-11-09 CN CN202011242746.5A patent/CN112321988B/en active Active
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- 2021-04-30 WO PCT/CN2021/091428 patent/WO2022095384A1/en unknown
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| US5326846A (en) * | 1992-04-04 | 1994-07-05 | Mitsubishi Gas Chemical Company, Inc. | Process for producing impact-resistant polyacetal resin composition |
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