Flame-retardant polyolefin nonwoven fabric, method for producing the same, and use thereof
By combining modified aluminum hydroxide with cationic starch in specific components and particle size ranges, the problems of flammability and decreased mechanical properties of nonwoven fabrics are solved, achieving high flame retardancy and excellent mechanical strength, as well as improved puncture resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAMEN DANGSHENG NEW MATERIAL CO LTD
- Filing Date
- 2025-01-22
- Publication Date
- 2026-06-05
AI Technical Summary
Existing nonwoven materials are easily flammable, and traditional flame retardant treatments affect mechanical properties and have the problem of layered structure peeling.
Using components such as HDPE, TPEE, maleic anhydride-grafted styrene, modified aluminum hydroxide, diethyl aluminum hypophosphite, and antimony trioxide, and through specific mass proportions and particle size ranges, a core-shell structure of modified aluminum hydroxide is formed that combines with cationic starch, enhancing molecular entanglement and hydrogen bonding ability, thereby improving flame retardancy and mechanical strength.
It achieves high flame retardancy and excellent mechanical strength, improved puncture resistance, slowed burning speed, and increased flame retardant protection rate.
Smart Images
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Abstract
Description
Technical Field
[0001] This application belongs to the field of polymer engineering plastics technology, and in particular relates to a flame-retardant polyolefin nonwoven fabric, its preparation method and application. Background Technology
[0002] Flash nonwoven fabric is a nonwoven product formed by extruding a polymer solution above the boiling point of the solvent under high pressure to a normal pressure environment. Due to the rapid change in pressure, it is transformed into fiber filaments and then aggregated. Compared with traditional nonwoven materials, it not only has high forming efficiency and uniform microstructure, but also has ideal mechanical strength and protective effect. At the same time, it is lightweight and very suitable for the packaging field.
[0003] However, existing traditional nonwoven fabrics are generally made of polyolefin materials, which contain a relatively high amount of hydrocarbon elements, making them more prone to combustion. Current flame-retardant treatments for nonwoven fabrics involve forming a flame-retardant layer on the surface, but this process is cumbersome and can affect the mechanical properties of the nonwoven fabric itself, especially its puncture resistance, and can also lead to the problem of layered structure peeling. Summary of the Invention
[0004] The purpose of this application is to overcome the shortcomings of the prior art and provide a flame-retardant polyolefin nonwoven fabric with high mechanical strength and excellent flame retardancy, as well as its preparation method and application.
[0005] To achieve the above objectives, in a first aspect of this application, a flame-retardant polyolefin nonwoven fabric is provided, comprising the following components in parts by weight: 60-85 parts HDPE, 5-10 parts TPEE, 5-15 parts maleic anhydride-grafted styrene, 2-6 parts modified aluminum hydroxide, 6-16 parts diethylaluminum hypophosphite, and 1-4 parts antimony trioxide.
[0006] The grafting rate of maleic anhydride onto styrene is greater than or equal to 8%.
[0007] The modified aluminum hydroxide has a core-shell structure, with aluminum hydroxide as the core and cationic starch as the shell.
[0008] The average particle size of the modified aluminum hydroxide is greater than or equal to 0.5 μm and less than or equal to 10 μm.
[0009] This application provides a flame-retardant polyolefin nonwoven fabric. By selecting specific mass fractions of components and ensuring their synergistic effect, the flame-retardant polyolefin nonwoven fabric effectively achieves good flame retardancy and excellent mechanical strength. Specifically, in the first aspect, this application uses HDPE resin as the matrix and selects an appropriate mass fraction of TPEE resin. Under the action of maleic anhydride grafted with styrene within a specific grafting rate range, the compatibility of the two is significantly improved, the molecular entanglement and crystallinity between them increase, thereby effectively improving the mechanical strength of the product, especially its puncture resistance. Furthermore, due to the increased crystallinity, the product can form a more stable crystal structure during combustion, thereby slowing down the burning rate and improving the flame-retardant performance of the product. In the second aspect, this application selects modified aluminum hydroxide with a core-shell structure and an average particle size within a certain range, wherein the core layer is aluminum hydroxide and the shell layer is cationic starch. The resulting modified aluminum hydroxide not only has high structural stability. Simultaneously, due to the presence of cationic starch on its surface, the cations can form electrostatic bonds with other components. Combined with the effects of maleic anhydride grafted with styrene and TPEE within a specific grafting range, this enhances the hydrogen bonding ability between systems, resulting in good and stable system dispersion. This effectively avoids the problem of weakened mechanical strength or decreased flame retardancy caused by the precipitation or migration of modified aluminum hydroxide. Therefore, modified aluminum hydroxide can effectively enhance the mechanical strength of the product as a filler, and it can also interact with diethylaluminum hypophosphite and antimony trioxide to further enhance the flame retardancy of the product. Thirdly, this application simultaneously selects diethylaluminum hypophosphite and antimony trioxide within appropriate mass ranges as compound flame retardants. Both have excellent dispersibility within the system and can synergistically complement each other. Combined with the addition of modified aluminum hydroxide, this effectively achieves good flame retardancy while ensuring excellent mechanical strength.
[0010] It should be noted that the average particle size of the modified aluminum hydroxide was obtained by laser particle size analysis.
[0011] It should be noted that the grafting rate of maleic anhydride-grafted styrene was obtained by infrared spectroscopy.
[0012] For example, the grafting rate of polypropylene grafted with styrene can be any point value or any two points within a range of 8% or greater, such as 8-15%, 8-12%, or 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.
[0013] For example, the average particle size of the modified aluminum hydroxide can be any point value or any two points within a range of 0.5 μm or greater and 10 μm or less, such as 0.5 μm, 0.8 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, etc.
[0014] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the flame-retardant polyolefin nonwoven fabric comprises the following components in parts by weight:
[0015] HDPE 70-75 parts, TPEE 7-8 parts, maleic anhydride-grafted styrene 8-12 parts, modified aluminum hydroxide 4-5 parts, diethylaluminum hypophosphite 10-12 parts, antimony trioxide 2-3 parts.
[0016] This study found that the selection of the mass fraction of the components also affects the overall performance of the product. When the mass fraction of the components is further selected within the above range, the resulting product has higher mechanical strength and better flame retardancy.
[0017] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the grafting rate of maleic anhydride-grafted styrene (PP-g-St) is greater than or equal to 10% and less than or equal to 12%.
[0018] The grafting rate of maleic anhydride-grafted styrene not only affects the compatibility of TPEE and HDPE, but also the dispersibility of modified aluminum hydroxide and other materials in the resin matrix. When the grafting rate of maleic anhydride-grafted styrene is further selected within the above range, the overall performance of the obtained product is better.
[0019] Preferably, the preparation method of maleic anhydride-grafted styrene includes the following steps: dissolving 0.5% wt benzoyl peroxide and styrene in acetone, adding polypropylene (PP 320, melt flow rate of 30 g / 10 min at 230℃ / 2.16 kg) and stirring, then melting and extruding to obtain maleic anhydride-grafted styrene.
[0020] Preferably, during the melt extrusion process, the temperature is controlled at 160-200℃, the main machine speed is 100-140rpm, and the feed screw speed is 15-25rpm to obtain PP-g-St.
[0021] This study found that maleic anhydride-grafted styrene with different grafting rates can be prepared by controlling the amount of styrene added.
[0022] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the modified aluminum hydroxide has an average particle size greater than or equal to 2 μm and less than or equal to 8 μm.
[0023] This study found that the average particle size of modified aluminum hydroxide affects its dispersion in the resin matrix. If the average particle size is too small, it leads to excessive micronization, making it prone to aggregation, increasing system viscosity and reducing processability. It also easily forms stress concentration points, increasing the product's brittleness. In other words, when the average particle size is too small, the dispersibility of modified aluminum hydroxide in the system deteriorates, weakening its role as a filler and flame retardant. Conversely, if the average particle size is too large, it also leads to decreased processability and reduced dispersibility, affecting the mechanical strength of the resulting product. Furthermore, the poor dispersibility caused by an excessively large average particle size results in a poorer surface condition, making it prone to precipitation and thus reducing the product's flame retardancy. When the average particle size of the modified aluminum hydroxide is further selected to be greater than or equal to 2 μm and less than or equal to 8 μm, the resulting product exhibits superior flame retardancy and higher mechanical strength.
[0024] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the mass percentage of the shell layer is greater than or equal to 3% and less than or equal to 5% based on the total mass of modified aluminum hydroxide.
[0025] For example, the mass percentage of the shell layer, based on the total mass of the modified aluminum hydroxide, can be any point value or any two-point range between 3% and 5%, such as 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.
[0026] This study found that, based on the total mass of modified aluminum hydroxide, the mass percentage of the shell layer affects the bonding force between modified aluminum hydroxide and other components, and also affects the role of aluminum hydroxide in the modified aluminum hydroxide. This not only affects the mechanical strength and flame retardancy of the product by influencing the compatibility and stability of the system, but also affects the flame retardancy by affecting the role of aluminum hydroxide. When the mass percentage of the shell layer based on the total mass of modified aluminum hydroxide is selected to be greater than or equal to 3% and less than or equal to 5%, the resulting product has better flame retardancy and higher mechanical strength.
[0027] Preferably, the method for preparing modified aluminum hydroxide includes the following steps:
[0028] S1. Gelatinize the cationic starch at 90-95℃ for 20-50 min, then add it to an aqueous solution of aluminum hydroxide and stir at 65-75℃ for 2-4 h.
[0029] S2. After the stirring reaction is complete, let it stand to precipitate, filter, collect the filter residue and dry and grind it to obtain modified aluminum hydroxide.
[0030] Preferably, the cationic starch can be PA97810 from Guangdong Wengjiang Chemical Reagent Co., Ltd., of analytical grade.
[0031] Preferably, the sodium hydroxide aqueous solution contains 2-8% sodium hydroxide by mass.
[0032] Preferably, the stirring speed is 300-800 rpm.
[0033] This application allows for the alteration of the shell mass percentage in modified aluminum hydroxide by adjusting the mass of cationic starch and aluminum hydroxide, or by controlling the reaction time and temperature. Furthermore, this application enables the preparation of modified aluminum hydroxide with different average particle size ranges by adjusting the grinding time and controlling the sieving process.
[0034] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the HDPE has a melt index of greater than or equal to 2 g / 10 min and less than or equal to 12 g / 10 min at 190°C and 2.16 kg load, according to ASTM D1238.
[0035] For example, according to ASTM D1238, the melt index of HDPE at 190°C and 2.16 kg load can be any point value or any two-point range value between ≥2 g / 10 min and ≤12 g / 10 min, such as 2 g / 10 min, 4 g / 10 min, 6 g / 10 min, 8 g / 10 min, 10 g / 10 min, 12 g / 10 min, etc.
[0036] For example, HDPE can be selected from Guanhe Plastics Technology (Shanghai) Co., Ltd.'s 7260.
[0037] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, TPEE has a melt index of greater than or equal to 10 g / 10 min and less than or equal to 20 g / 10 min at 240 °C and 2.16 kg load, according to ASTM D1238.
[0038] For example, the melt flow index of TPEE at 240°C and 2.16 kg load, according to ASTM D1238, can be any point value or any two-point range between 10 g / 10 min and 20 g / 10 min, such as 10 g / 10 min, 12 g / 10 min, 14 g / 10 min, 16 g / 10 min, 18 g / 10 min, 20 g / 10 min, etc.
[0039] For example, the TPEE can be selected from TPEE KOPEL KP3855FB of Dongguan Tianzhihong Plastic Co., Ltd.
[0040] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the flame-retardant polyolefin nonwoven fabric further includes 0.1-2 parts of processing aids.
[0041] Preferably, the processing aids include at least one of antioxidants and lubricants.
[0042] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of this application, the basis weight of the flame-retardant polyolefin nonwoven fabric is greater than 95 g / m². 2 The flame-retardant polyolefin nonwoven fabric has a puncture resistance greater than 7956 J / m. 2 The limiting oxygen index of the flame-retardant polyolefin nonwoven fabric is greater than or equal to 33.9%, and the flame retardant protection rate of the flame-retardant polyolefin nonwoven fabric is greater than 34.3%.
[0043] In a second aspect, this application provides a method for preparing flame-retardant polyolefin nonwoven fabric, the method comprising the following steps:
[0044] The components are added to a mixing apparatus containing a solvent, then heated and nitrogen gas is introduced to maintain a temperature greater than or equal to 200°C and less than or equal to 230°C, and a pressure greater than or equal to 10 MPa and less than or equal to 12 MPa, to obtain a spinning solution.
[0045] The spinning solution is placed in a flash spinning device for spinning and the fiber is received by a receiving device to form a film. The resulting fiber film is then cold-pressed and hot-rolled to obtain flash nonwoven fabric.
[0046] Preferably, the solvent has a boiling point ≤100℃.
[0047] More preferably, the solvent includes at least one of benzene, toluene, butane, pentene, n-hexane, heptane, octane, cyclohexane, dichloromethane, carbon tetrachloride, chloroform, chloromethane, chlorofluoromethane, and chloroethane.
[0048] More preferably, the mass ratio of the solid phase to the liquid phase in the spinning solution is (10-30):(70-90).
[0049] More preferably, the flash spinning device is prepared using the production equipment 300 used in the inventor's prior research and development technology CN115323628B.
[0050] It should be noted that the products of this application are not limited to the production equipment mentioned above. Those skilled in the art can also use other types of flash evaporation production equipment to produce the products according to actual needs, as long as products with the same technical features and effects can be prepared.
[0051] In a third aspect of this application, the application of flame-retardant polyolefin nonwoven fabrics in the preparation of home furnishing and decoration materials, personal protective equipment, transportation materials, building and engineering materials, industrial application materials, military and defense materials, electronic and electrical product materials, and fire-resistant materials is provided.
[0052] The flame-retardant polyolefin nonwoven fabric provided in this application has excellent mechanical strength and flame retardancy, and can be used in packaging materials to provide good mechanical properties and flame retardancy.
[0053] For example, the home furnishing and decorating materials include mattresses, furniture fabrics, wallpaper, wall coverings, ceiling decorations, curtains, carpets, floor coverings, loungewear, etc.
[0054] For example, the personal protective equipment includes protective clothing and work clothes, such as firefighter clothing and welding worker clothing; the personal protective equipment also includes medical textiles, such as surgical drapes and isolation gowns.
[0055] For example, the transportation materials include vehicle interior materials, such as seats, door panels, and headliners; the transportation materials also include aircraft interior materials, such as seats, partitions, and baggage compartment liners.
[0056] For example, the building and engineering materials include building partitions and sound insulation materials, fireproof and heat insulation materials, waterproof and breathable membranes, cable and pipe covering materials, etc.
[0057] For example, the industrial application materials include industrial wiping cloths, industrial oil-absorbing materials, etc.
[0058] For example, the military and defense materials include tents and sunshade materials, protective devices and equipment covers, etc.
[0059] For example, the electronic and electrical product materials include insulating and heat-insulating materials, internal protective layer materials of equipment, etc.
[0060] For example, the fire protection materials include smoke and flame barrier curtains, fire escape devices and path guiding materials, fireproof clothing, light box films, etc.
[0061] Compared with the prior art, the beneficial effects of this application are as follows:
[0062] This application provides a flame-retardant polyolefin nonwoven fabric. By selecting appropriate mass proportions of components, while limiting the grafting rate of maleic anhydride-grafted styrene within a certain range, and ensuring that the modified aluminum hydroxide has a core-shell structure with an average particle size within a specific range, and that the shell is cationic starch, the components exhibit excellent synergistic effects, effectively improving the flame retardancy and mechanical strength of the product. Specifically, the obtained flame-retardant polyolefin nonwoven fabric has a puncture resistance of 7956 J / m.2 The limiting oxygen index is above 33.9%, and the flame retardant protection rate is above 34.3%. Furthermore, the preparation method of the flame-retardant polyolefin nonwoven fabric provided in this application is simple and beneficial for practical applications. Detailed Implementation
[0063] To better illustrate the purpose, technical solution, and advantages of this application, the following will provide further explanation of this application in conjunction with specific embodiments.
[0064] Unless otherwise specified, the reagents, methods and equipment used in this application are all conventional reagents, methods and equipment in the field.
[0065] HDPE: Melt index of 7 g / 10 min at 190℃ and 2.16 kg load.
[0066] TPEE: Melt index of 16 g / 10 min at 240℃ and 2.16 kg load.
[0067] PP-g-St1: Grafting rate 10%,
[0068] PP-g-St2: Grafting rate 13%,
[0069] PP-g-St3: Grafting rate 15%,
[0070] PP-g-St4: Grafting rate 8%,
[0071] PP-g-St5: Grafting rate 6%,
[0072] Modified aluminum hydroxide 1: average particle size 2μm, shell mass percentage 3%,
[0073] Modified aluminum hydroxide 2: average particle size 8μm, shell mass percentage 3%,
[0074] Modified aluminum hydroxide 3: average particle size 0.5 μm, shell mass percentage 3%,
[0075] Modified aluminum hydroxide 4: average particle size 10 μm, shell mass percentage 3%,
[0076] Modified aluminum hydroxide 5: average particle size 2μm, shell mass percentage 5%,
[0077] Modified aluminum hydroxide 6: average particle size 0.1 μm, shell mass percentage 3%,
[0078] Modified aluminum hydroxide 7: average particle size 15 μm, shell mass percentage 3%,
[0079] Aluminum hydroxide: average particle size is 2μm.
[0080] Examples 1-11 and Comparative Examples 1-7
[0081] This application provides a flame-retardant polyolefin nonwoven fabric in the embodiments and comparative examples. The components (parts by mass) of the flame-retardant polyolefin nonwoven fabric are shown in Tables 1-2.
[0082] Table 1
[0083]
[0084]
[0085] Table 2
[0086]
[0087] The preparation method of the flame-retardant polyolefin nonwoven fabric provided in Example 1 includes the following steps:
[0088] (1) Masterbatch preparation: Mix the components in Table 1, then transfer the mixture to a twin-screw extruder and melt-extrude it into granules at 90–180°C to obtain the masterbatch. The temperature settings of the twin-screw extruder are as follows: Zone 1 90–110°C, Zone 2 120–130°C, Zone 3 150–160°C, Zone 4 170–180°C, Zone 5 170–185°C, Zone 6 170–185°C, Zone 7 160–165°C, Zone 8 160–165°C, Zone 9 160–165°C, Zone 10 160–165°C. The screw speed of the twin-screw extruder is 180–220 rpm.
[0089] (2) Preparation of spinning solution: The masterbatch was transferred to a reaction vessel containing a mixed solvent (15%:85%) of difluorochloromethane and tetrafluorodichloroethane. The mixture was preheated to 180°C, then pressurized to 12 MPa by introducing nitrogen gas, and finally heated to 225°C and stirred in a sealed container for 2 hours. After the temperature stabilized, the spinning solution was obtained. The mass ratio of the solid phase to the liquid phase in the spinning solution was 15:85.
[0090] (3) Preparation of flash-spun nonwoven fabric: Referring to CN115323628B, a flash spinning equipment 300 was used. The spinning solution was transferred to the nozzle for spinning, and then the filaments were refracted and reflected by a rotating splitter to form a mesh, which was then laid on a moving screen. The velocity of the ejected airflow was 12000 m / min, the frequency of the rotating splitter was 35 Hz, and the forward speed of the moving screen was 45 m / min. The collected mesh was cold-pressed at 0.5-1 MPa and hot-rolled at 140℃ and 3-3.5 MPa (hot rolling roller speed was 45-50 m / min) to obtain a basis weight of 100 g / m². 2 Layered flame-retardant polyolefin nonwoven fabric.
[0091] The preparation methods of the flame-retardant polyolefin nonwoven fabrics provided in Examples 2-11 and Comparative Examples 1-7 are consistent with the preparation method in Example 1.
[0092] Example 12
[0093] This application provides a flame-retardant polyolefin nonwoven fabric, the only difference between the flame-retardant polyolefin nonwoven fabric and that of Example 1 is that the basis weight is 120 g / m². 2 Hierarchy.
[0094] Example of effect
[0095] This application investigates the performance of the flame-retardant polyolefin nonwoven fabrics prepared in the examples and comparative examples, specifically including the following aspects:
[0096] 1. Puncture resistance: Tested according to GB / T 8809-2015.
[0097] 2. Limiting Oxygen Index: Tested according to GB / T 5454-1997.
[0098] 3. Combustion performance: Tested according to GB / T 5455-2014, with a total radial length of 300 mm for the test sample.
[0099] The results of the above performance tests are recorded in Table 3-4.
[0100] Table 3
[0101]
[0102]
[0103] Table 4
[0104]
[0105] The damage length is the average value of 5 tests conducted on each embodiment, and the flame retardant protection rate is calculated as (1 - damage length / total radial length of the test sample) * 100%.
[0106] As can be seen from Tables 3-4, when the preparation method provided in this application is used, the obtained flame-retardant polyolefin nonwoven fabric exhibits excellent mechanical strength and good flame retardancy. Specifically, the puncture resistance of the obtained flame-retardant polyolefin nonwoven fabric is 7956 J / m. 2 The limiting oxygen index is above 33.9%, and the flame retardant protection rate is above 34.3%.
[0107] As can be seen from Examples 1-4 and Comparative Examples 1-3, the mass fraction of the components affects the overall performance of the product. When the mass fraction of the components is further selected within the preferred range of this application, the puncture resistance of the obtained flame-retardant polyolefin nonwoven fabric is 8365 J / m. 2 The limiting oxygen index (LOI) of the above products is above 36.2%, and the flame retardant protection rate is above 40.0%. When the mass fraction of TPEE in Comparative Example 1 is 0 parts, both the puncture resistance and the LIO index of the resulting product show a significant decreasing trend. When the mass fraction of antimony trioxide in Comparative Example 2 is 0 parts, the LIO index of the resulting product shows a significant decreasing trend, and the puncture resistance also shows a certain decreasing trend, while the flame retardant protection rate also decreases significantly. When the amount of modified aluminum hydroxide added in Comparative Example 3 is excessive, the puncture resistance of the resulting product shows a significant decreasing trend, and the LIO index and flame retardant protection rate also show a certain decreasing trend.
[0108] As can be seen from Examples 1, 5-7, and Comparative Example 4, the grafting rate of maleic anhydride-grafted styrene also affects the overall performance of the product. When the grafting rate of maleic anhydride-grafted styrene is further selected within the preferred range of this application, the puncture resistance of the obtained flame-retardant polyolefin nonwoven fabric is 8405 J / m. 2 The limiting oxygen index is above 36.5%, and the flame retardant protection rate is above 41.0%. When the grafting rate of maleic anhydride-grafted styrene in Comparative Example 4 is too low and falls outside the scope of this application, the puncture resistance, limiting oxygen index, and flame retardant protection rate of the obtained product all show a significant downward trend.
[0109] As can be seen from Examples 1, 8-11, and Comparative Examples 5-6, the average particle size of the modified aluminum hydroxide and the mass percentage of the shell layer also affect the overall performance of the product. When the average particle size of the modified aluminum hydroxide and the mass percentage of the shell layer are further selected within the preferred range of this application, the puncture resistance of the obtained flame-retardant polyolefin nonwoven fabric is 8398 J / m. 2 The limiting oxygen index (LOI) of the above-mentioned products was above 36.1%, and the flame retardant protection rate was above 39.3%. When the average particle size of the modified aluminum hydroxide in Comparative Example 5 was too small, the puncture resistance, limiting oxygen index, and flame retardant protection rate of the obtained product all showed a certain downward trend. When the average particle size of the modified aluminum hydroxide in Comparative Example 6 was too large, the puncture resistance, limiting oxygen index, and flame retardant protection rate of the obtained product also showed a significant downward trend.
[0110] As can be seen from Example 1 and Comparative Example 7, when aluminum hydroxide and cationic starch are added separately to prepare the product instead of preparing modified aluminum hydroxide, the product obtained cannot achieve the effect of this application.
[0111] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of this application and not to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.
Claims
1. A flame-retardant polyolefin nonwoven fabric, characterized in that, The flame-retardant polyolefin nonwoven fabric comprises the following components in parts by weight: HDPE 60~85 parts, TPEE 5~10 parts, PP-g-St 5~15 parts, modified aluminum hydroxide 2~6 parts, diethyl aluminum hypophosphite 6~16 parts, antimony trioxide 1~4 parts; The grafting rate of the PP-g-St is greater than or equal to 8% and less than or equal to 15%; The modified aluminum hydroxide has a core-shell structure, with the core layer being aluminum hydroxide and the shell layer being cationic starch; The modified aluminum hydroxide has an average particle size greater than or equal to 1 μm and less than or equal to 10 μm; The shell layer comprises 3% to 5% of the total mass of the modified aluminum hydroxide. The flame-retardant polyolefin nonwoven fabric has a puncture resistance greater than 7956 J / m. 2 The limiting oxygen index of the flame-retardant polyolefin nonwoven fabric is greater than or equal to 33.9%.
2. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that, The flame-retardant polyolefin nonwoven fabric comprises the following components in parts by weight: HDPE 70~75 parts, TPEE 7~8 parts, PP-g-St 8~12 parts, modified aluminum hydroxide 4~5 parts, diethyl aluminum hypophosphite 10~12 parts, antimony trioxide 2~3 parts.
3. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that, The grafting rate of the PP-g-St is greater than or equal to 10% and less than or equal to 12%; And / or, the average particle size of the modified aluminum hydroxide is greater than or equal to 2 μm and less than or equal to 8 μm.
4. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that, The HDPE, according to ASTM D1238, has a melt index of greater than or equal to 2 g / 10 min and less than or equal to 12 g / 10 min at 190 °C and 2.16 kg load.
5. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that, The TPEE, according to ASTM D1238, has a melt flow index greater than or equal to 10 g / 10 min and less than or equal to 20 g / 10 min at 240 °C and 2.16 kg load.
6. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that, The flame-retardant polyolefin nonwoven fabric also includes 0.1-2 parts of processing aids.
7. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that, The basis weight of the flame-retardant polyolefin nonwoven fabric is greater than or equal to 95 g / m². 2 The flame-retardant polyolefin nonwoven fabric has a flame retardant protection rate of over 34.3%.
8. The method for preparing flame-retardant polyolefin nonwoven fabric according to any one of claims 1-7, characterized in that, The preparation method includes the following steps: Each component is added to a reaction vessel containing a solvent, and then heated and nitrogen gas is introduced to make the temperature inside the reaction vessel greater than or equal to 200°C and less than or equal to 230°C, and the pressure greater than or equal to 10MPa and less than or equal to 12MPa, to obtain a spinning solution. The spinning solution is placed in a flash spinning device for spinning and the fiber is received by a receiving device to form a film. The resulting fiber film is then cold-pressed and hot-rolled to obtain flash nonwoven fabric.
9. The application of the flame-retardant polyolefin nonwoven fabric as described in any one of claims 1-7 in the preparation of home furnishing and decoration materials, personal protective equipment, transportation materials, building and engineering materials, industrial application materials, military and defense materials, electronic and electrical product materials, and fire-resistant materials.