Flame-retardant polyolefin non-woven fabric as well as preparation method and application thereof

Abstract

The invention discloses a flame-retardant polyolefin non-woven fabric as well as a preparation method and application thereof, and belongs to the technical field of polymer engineering plastics. The flame-retardant polyolefin non-woven fabric is prepared from, by mass, 60-85 parts of HDPE, 5-10 parts of TPEE, 5-15 parts of maleic anhydride grafted styrene, 2-6 parts of modified aluminum hydroxide, 6-16 parts of diethyl aluminum hypophosphite and 1-4 parts of antimonous oxide, the grafting rate of maleic anhydride grafted styrene is larger than or equal to 8%, the modified aluminum hydroxide is of a core-shell structure, a core layer is aluminum hydroxide, and a shell layer is aluminum hydroxide. The shell layer is cationic starch, and the average particle size of the modified aluminum hydroxide is greater than or equal to 0.5 mu m and less than or equal to 10 mu m. The flame-retardant polyolefin non-woven fabric prepared by the preparation method disclosed by the invention has excellent mechanical strength and good flame retardance. In addition, the preparation method of the flame-retardant polyolefin non-woven fabric provided by the invention is simple to operate and beneficial to actual production.

Description

Technical Field

[0001] The present application belongs to the technical field of polymer engineering plastics, and in particular relates to a flame-retardant polyolefin non-woven fabric and a preparation method and application thereof. Background Art

[0002] Flash non-woven fabric is a non-woven fabric product formed by extruding a polymer solution above the boiling point of the solvent and under high pressure into a normal pressure environment. Due to the rapid change in pressure, the solution is converted into fiber strands. Compared with traditional non-woven fabric materials, it not only has high molding efficiency and uniform microstructure, but also has ideal mechanical strength and protective effect. At the same time, it has a light weight and is very suitable for the packaging field.

[0003] However, because existing non-woven fabrics are generally made of polyolefin materials, which contain a high content of hydrocarbons and are prone to combustion, existing flame-retardant treatments for non-woven fabrics typically form a flame-retardant layer on the surface. This process is cumbersome and affects the mechanical properties of the non-woven fabric itself, especially its puncture resistance, and there is also the problem of layered structure peeling. Summary of the Invention

[0004] The purpose of this application is to overcome the shortcomings of the above-mentioned prior art and provide a flame-retardant polyolefin non-woven fabric with high mechanical strength and excellent flame retardancy, as well as a preparation method and application thereof.

[0005] To achieve the above-mentioned object, in a first aspect of the present application, the present application provides a flame-retardant polyolefin non-woven fabric, which comprises the following components in parts by mass: 60-85 parts of HDPE, 5-10 parts of TPEE, 5-15 parts of maleic anhydride grafted styrene, 2-6 parts of modified aluminum hydroxide, 6-16 parts of diethyl aluminum hypophosphite, and 1-4 parts of antimony trioxide.

[0006] The grafting rate of maleic anhydride grafted styrene is greater than or equal to 8%,

[0007] The modified aluminum hydroxide has a core-shell structure, the core layer is aluminum hydroxide, and the shell layer is cationic starch.

[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] The flame retardant polyolefin non-woven fabric provided by the present application can effectively achieve good flame retardancy and excellent mechanical strength of the flame retardant polyolefin non-woven fabric by selecting components in parts by mass and cooperating with each other. Specifically, on the first aspect, the present application uses HDPE resin as the matrix and selects TPEE resin in appropriate parts by mass. Under the action of maleic anhydride grafted styrene within a specific grafting rate range, the compatibility of the two is significantly improved, the molecular entanglement degree between the two increases, and the crystallinity increases, thereby effectively improving the mechanical strength of the product, especially the puncture resistance. Moreover, due to the increase in crystallinity, the product can form a more stable crystal structure when burning, thereby slowing down the burning speed and improving the flame retardant properties of the product. On the second aspect, the present application chooses to add a 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 modified aluminum hydroxide formed not only has high structural stability itself. At the same time, because its surface has cationic starch, the cations therein can form a certain electrostatic binding effect with other components, cooperate with the effect of maleic anhydride grafted styrene and TPEE in a specific grafting rate range, enhance the hydrogen bonding ability between the systems, and form a good and stable system dispersion, thereby effectively avoiding the problem of weakening mechanical strength or decreasing flame retardancy due to precipitation or migration of modified aluminum hydroxide, and thus can realize the modified aluminum hydroxide as a filler to effectively enhance the mechanical strength of the product, and can also achieve interaction with diethyl aluminum hypophosphite and antimony trioxide, further enhancing the flame retardancy of the product. Thirdly, the present application simultaneously selects diethyl aluminum hypophosphite and antimony trioxide in a suitable mass range as a compound flame retardant, both of which have excellent dispersibility in the system, and the two can cooperate with each other, combined with the addition of modified aluminum hydroxide, can effectively achieve good flame retardancy of the product, while also ensuring excellent mechanical strength of the product.

[0010] It should be noted that the average particle size of the modified aluminum hydroxide is obtained by laser particle size analysis.

[0011] It should be noted that the grafting rate of maleic anhydride grafted styrene is obtained by infrared spectrometer testing.

[0012] Exemplarily, the grafting rate of polypropylene grafted styrene can be any point value or any two point range value greater than or equal to 8%, such as 8-15%, 8-12%, etc., or 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0013] Exemplarily, the average particle size of the modified aluminum hydroxide can be any point value or any two point range values ​​between greater than or equal to 0.5 μm and less than or equal to 10 μm, 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 non-woven fabric of the present application, the flame-retardant polyolefin non-woven fabric includes the following components in parts by mass:

[0015] 70-75 parts of HDPE, 7-8 parts of TPEE, 8-12 parts of maleic anhydride grafted styrene, 4-5 parts of modified aluminum hydroxide, 10-12 parts of diethylaluminum hypophosphite, and 2-3 parts of antimony trioxide.

[0016] The present application study found that the selection of the mass parts of the components will also affect the comprehensive performance of the product. When the mass parts of the components are further selected to be within the above range, the obtained product has higher mechanical strength and better flame retardancy.

[0017] As a preferred embodiment of the flame-retardant polyolefin non-woven fabric of the present 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 affects the dispersibility of modified aluminum hydroxide and the like 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 comprises the following steps: dissolving 0.5% wt benzoyl peroxide and styrene in acetone, adding polypropylene (PP 320, melt mass flow rate of 30 g / 10 min at 230° C. / 2.16 kg) and stirring, and then melt-extruding after stirring to obtain maleic anhydride grafted styrene.

[0020] Preferably, during the melt extrusion process, the temperature is controlled at 160-200° C., the main engine speed is 100-140 rpm, and the feeding screw speed is 15-25 rpm to obtain PP-g-St.

[0021] The present application study found that by controlling the amount of styrene added, the preparation of maleic anhydride grafted styrene with different grafting rates can be achieved.

[0022] As a preferred embodiment of the flame-retardant polyolefin non-woven fabric of the present application, 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.

[0023] The present application has found that the average particle size of modified aluminum hydroxide will affect its dispersion effect in the resin matrix. If the average particle size is too small, it will lead to excessive micronization, easy aggregation, increase the viscosity of the system and cause the processing performance to decline, and it will also easily form stress concentration points, resulting in increased brittleness of the product, that is, when the average particle size is too small, the dispersibility of modified aluminum hydroxide in the system deteriorates, and its role as a filler and flame retardant will be relatively weakened. If the average particle size is too large, there will also be a problem of decreased processing performance, and it will also cause its dispersibility to decline, affecting the mechanical strength of the product obtained. At the same time, due to the poor dispersibility caused by the excessive average particle size, the surface state of the product will be deteriorated, and precipitation will be easily formed, thereby reducing the flame retardancy of the product. When the average particle size of modified aluminum hydroxide is further selected to be greater than or equal to 2 μm and less than or equal to 8 μm, the flame retardancy of the obtained product is better and the mechanical strength is higher.

[0024] As a preferred embodiment of the flame-retardant polyolefin non-woven fabric of the present 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 the modified aluminum hydroxide.

[0025] Illustratively, based on the total mass of the modified aluminum hydroxide, the mass percentage of the shell layer can be any point value or any two-point range value between greater than or equal to 3% and less than or equal to 5%, for example, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, etc.

[0026] The present application study found that, based on the total mass of the modified aluminum hydroxide, the mass percentage of the shell layer will affect the bonding strength between the modified aluminum hydroxide and other components, and will also affect the role of aluminum hydroxide in the modified aluminum hydroxide, thereby not only affecting the mechanical strength and flame retardancy of the product by affecting the compatibility and stability of the system, but also affecting the flame retardancy due to affecting the role of aluminum hydroxide. When the mass percentage of the shell layer is further selected to be greater than or equal to 3% and less than or equal to 5% based on the total mass of the modified aluminum hydroxide, the resulting product has better flame retardancy and higher mechanical strength.

[0027] Preferably, the preparation method of modified aluminum hydroxide comprises the following steps:

[0028] S1. Gelatinize the cationic starch at 90-95°C for 20-50 minutes, then add it to the aluminum hydroxide aqueous solution and stir at 65-75°C for 2-4 hours.

[0029] S2. After the stirring reaction is completed, the mixture is allowed to settle and filtered. The filter residue is collected and dried and ground to obtain modified aluminum hydroxide.

[0030] Preferably, the cationic starch can be PA97810 produced by Guangdong Wengjiang Chemical Reagent Co., Ltd., which is analytically pure.

[0031] Preferably, the mass percentage of sodium hydroxide in the sodium hydroxide aqueous solution is 2 to 8%.

[0032] Preferably, the stirring speed is 300-800 rpm.

[0033] The present invention can change the mass percentage of the shell layer in the modified aluminum hydroxide by adjusting the mass of cationic starch and aluminum hydroxide or the reaction time and temperature. The present invention can prepare modified aluminum hydroxide with different average particle size ranges by adjusting the grinding time and screening control.

[0034] As a preferred embodiment of the flame-retardant polyolefin nonwoven fabric of the present application, the melt index of HDPE at 190° C. and a load of 2.16 kg according to ASTM D1238 is greater than or equal to 2 g / 10 min and less than or equal to 12 g / 10 min.

[0035] Illustratively, the melt index of HDPE at 190°C and a load of 2.16 kg according to ASTM D1238 can be any point value or any two-point range value between greater than or equal to 2 g / 10 min and less than or equal to 12 g / 10 min, for example, 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] Illustratively, the HDPE can be selected from 7260 of Guanhe Plastic Technology (Shanghai) Co., Ltd.

[0037] As a preferred embodiment of the flame-retardant polyolefin non-woven fabric of the present application, the melt index of TPEE at 240° C. and a load of 2.16 kg according to ASTM D1238 is greater than or equal to 10 g / 10 min and less than or equal to 20 g / 10 min.

[0038] Illustratively, the melt index of TPEE at 240°C and a load of 2.16 kg according to ASTM D1238 can be any point value or any two-point range value between greater than or equal to 10 g / 10 min and less than or equal to 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, TPEE can be selected from TPEE KOPEL KP3855FB produced by Dongguan Tianzhihong Plastics Co., Ltd.

[0040] As a preferred embodiment of the flame-retardant polyolefin non-woven fabric of the present application, the flame-retardant polyolefin non-woven fabric further comprises 0.1-2 parts of a processing aid.

[0041] Preferably, the processing aid includes at least one of an antioxidant and a lubricant.

[0042] As a preferred embodiment of the flame retardant polyolefin nonwoven fabric of the present application, the weight of the flame retardant polyolefin nonwoven fabric is greater than 95g / m 2 The puncture resistance of the flame retardant polyolefin non-woven fabric is greater than 7956 J / m 2 The limiting oxygen index of the flame-retardant polyolefin non-woven fabric is greater than or equal to 33.9%, and the flame retardant protection rate of the flame-retardant polyolefin non-woven fabric is above 34.3%.

[0043] In a second aspect of the present application, the present application provides a method for preparing a flame-retardant polyolefin non-woven fabric, the preparation method comprising the following steps:

[0044] Each component is added to a mixing device containing a solvent, and then heated and nitrogen is introduced so that the temperature in the mixing device is greater than or equal to 200° C. and less than or equal to 230° C., and the pressure is 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 is received by a receiving device to form a film. The obtained fiber film is cold pressed and hot rolled to obtain a flash non-woven fabric.

[0046] Preferably, the boiling point of the solvent is ≤ 100°C.

[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 ethyl chloride.

[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 by the inventor in the prior research and development technology CN115323628B.

[0050] It should be noted that the products of this application are not limited to the production of the above-mentioned production equipment. Those skilled in the art may also adopt other types of flash evaporation production equipment to produce products according to actual needs, as long as products with the same technical characteristics and technical effects can be prepared.

[0051] In the third aspect of the present application, the present application provides the use of flame-retardant polyolefin non-woven fabrics in the preparation of home and decoration materials, personal protective equipment, transportation materials, construction and engineering materials, industrial application materials, military and defense materials, electronic and electrical product materials, and fire protection materials.

[0052] The flame-retardant polyolefin non-woven fabric provided in the present application has relatively excellent mechanical strength and flame retardancy, and can be used in packaging materials to provide the packaging materials with good mechanical properties and flame retardancy.

[0053] Exemplarily, the home furnishing and decoration materials include mattresses, furniture fabrics, wallpapers, wall decorations, ceiling decorations, curtains, carpets, floor coverings, home clothes, etc.

[0054] Exemplarily, the personal protective equipment includes protective clothing and work clothes, such as firefighter clothing, welding worker clothing, etc.; the personal protective equipment also includes medical textiles, such as surgical drapes, isolation clothing, etc.

[0055] Exemplarily, the transportation materials include vehicle interior materials, such as seats, door panels, roofs, etc.; the transportation materials also include aircraft interior materials, such as seats, partitions, luggage compartment linings, etc.

[0056] Exemplarily, the construction and engineering materials include building partition and sound insulation materials, fireproof and heat-insulating materials, waterproof and breathable membranes, cable and pipe covering materials, etc.

[0057] Illustratively, the industrial application materials include industrial wiping cloths, industrial oil absorbing materials, and the like.

[0058] Illustratively, the military and defense materials include tents and shade materials, protective gear and equipment coverings, and the like.

[0059] Exemplarily, the electronic and electrical product materials include insulating and heat-insulating materials, equipment internal protective layer materials, etc.

[0060] Exemplarily, the fire protection materials include smoke and flame barrier curtains, fire escape devices and path indication materials, fire retardant clothing, light box films, etc.

[0061] Compared with the prior art, the present invention has the following advantages:

[0062] The present application provides a flame-retardant polyolefin nonwoven fabric. By selecting appropriate mass fractions of components, limiting the grafting rate of maleic anhydride grafted styrene within a certain range, and the modified aluminum hydroxide being a core-shell structure material with an average particle size within a specific range, and the shell being cationic starch, the components have excellent synergistic effects, which can effectively improve the flame retardancy and mechanical strength of the product. Specifically, the puncture resistance of the obtained flame-retardant polyolefin nonwoven fabric is 7956 J / m2 The limiting oxygen index is above 33.9%, and the flame retardant protection rate is above 34.3%. At the same time, the preparation method of the flame retardant polyolefin non-woven fabric provided in the present application is simple and is conducive to practical application. DETAILED DESCRIPTION

[0063] In order to better illustrate the purpose, technical solutions and advantages of this application, this application will be further described below in conjunction with specific embodiments.

[0064] Unless otherwise specified, the reagents, methods and equipment used in this application are conventional reagents, methods and equipment in the art.

[0065] HDPE: The melt index at 190°C and 2.16kg load is 7g / 10min.

[0066] TPEE: The melt index at 240°C and 2.16 kg load is 16 g / 10 min.

[0067] PP-g-St1: grafting rate 10%,

[0068] PP-g-St2: grafting rate is 13%,

[0069] PP-g-St3: grafting rate is 15%,

[0070] PP-g-St4: grafting rate is 8%,

[0071] PP-g-St5: grafting rate is 6%,

[0072] Modified aluminum hydroxide 1: average particle size is 2 μm, mass percentage of shell is 3%,

[0073] Modified aluminum hydroxide 2: average particle size is 8 μm, the mass percentage of the shell is 3%,

[0074] Modified aluminum hydroxide 3: average particle size is 0.5 μm, mass percentage of shell is 3%,

[0075] Modified aluminum hydroxide 4: average particle size is 10 μm, mass percentage of shell is 3%,

[0076] Modified aluminum hydroxide 5: average particle size is 2 μm, the mass percentage of the shell is 5%,

[0077] Modified aluminum hydroxide 6: average particle size is 0.1 μm, mass percentage of shell is 3%,

[0078] Modified aluminum hydroxide 7: average particle size is 15 μm, mass percentage of shell is 3%,

[0079] Aluminum hydroxide: average particle size is 2 μm.

[0080] Examples 1-11 and Comparative Examples 1-7

[0081] The examples and comparative examples of the present application provide a flame-retardant polyolefin non-woven fabric. The components (parts by mass) of the flame-retardant polyolefin non-woven fabric are shown in Table 1-2.

[0082] Table 1

[0083]

[0084]

[0085] Table 2

[0086]

[0087] The method for preparing the flame-retardant polyolefin nonwoven fabric provided in Example 1 comprises the following steps:

[0088] (1) Preparation of masterbatch: The components in Table 1 were mixed and then transferred to a twin-screw extruder for melt extrusion and granulation at 90-180°C to obtain masterbatch. The temperature of the twin-screw extruder was set as follows: 90-110°C in zone 1, 120-130°C in zone 2, 150-160°C in zone 3, 170-180°C in zone 4, 170-185°C in zone 5, 170-185°C in zone 6, 160-165°C in zone 7, 160-165°C in zone 8, 160-165°C in zone 9, and 160-165°C in zone 10. The screw speed of the twin-screw extruder was 180-220 rpm.

[0089] (2) Preparation of spinning solution: The masterbatch was transferred to a reactor containing a mixed solvent of difluorochloromethane and tetrafluorodichloroethane (15%:85%), preheated to 180°C, then nitrogen was introduced and pressurized to 12 MPa, and finally heated to 225°C and stirred in a closed 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 non-woven fabric: Referring to CN115323628B, a flash spinning device 300 is used to transfer the spinning solution to the nozzle for spray spinning, and then the spinning solution is refracted and reflected by a rotating filament separator to form a mesh and laid on a moving mesh curtain. The speed of the ejected air flow is 12000m / min, the frequency of the rotating filament separator is 35Hz, and the forward speed of the moving mesh curtain is 45m / min. The collected mesh is cold pressed at a pressure of 0.5-1MPa and hot rolled at a pressure of 140℃ and 3-3.5MPa (the hot rolling roller surface speed is 45-50m / min), and the weight is 100g / m 2 Layered flame retardant polyolefin nonwoven fabric.

[0091] The preparation methods of the flame-retardant polyolefin non-woven fabrics provided in Examples 2 to 11 and Comparative Examples 1 to 7 are consistent with the preparation method in Example 1.

[0092] Example 12

[0093] The embodiment of the present application provides a flame retardant polyolefin nonwoven fabric. The only difference between the flame retardant polyolefin nonwoven fabric and the embodiment 1 is that the gram weight is 120g / m 2 level.

[0094] Effect Examples

[0095] The present application's effect examples explore the properties of the flame-retardant polyolefin nonwoven fabrics prepared in the examples and comparative examples, specifically including the following aspects:

[0096] 1. Puncture resistance: Tested in accordance with GB / T 8809-2015.

[0097] 2. Limiting oxygen index: Tested in accordance with GB / T 5454-1997.

[0098] 3. Combustion performance: Tested in accordance with GB / T 5455-2014, the total radial length of the test sample is 300 mm.

[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 damaged length is the average value of 5 tests for each embodiment, and the flame retardant protection rate = (1-damaged length / total radial length of the test sample) * 100%.

[0106] As can be seen from Tables 3-4, when the preparation method provided by the present application is adopted, the flame retardant polyolefin nonwoven fabric obtained has excellent mechanical strength and good flame retardancy. Specifically, the puncture resistance of the flame retardant polyolefin nonwoven fabric obtained is 7956 J / m 2 Above, the limiting oxygen index is above 33.9%, and the flame retardant protection rate is above 34.3%.

[0107] It can be seen from Examples 1 to 4 and Comparative Examples 1 to 3 that the mass fraction of the components will affect the overall performance of the product. When the mass fractions of the components are further selected within the preferred range of this application, the puncture resistance of the flame retardant polyolefin nonwoven fabric obtained is 8365 J / m 2 Above, the limiting oxygen index 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, the puncture resistance and limiting oxygen index of the obtained product both show a significant downward trend. When the mass fraction of antimony trioxide in Comparative Example 2 is 0 parts, the limiting oxygen index of the obtained product shows a significant downward trend, and the puncture resistance also shows a certain downward trend, while the flame retardant protection rate also decreases significantly. When the amount of modified aluminum hydroxide added in Comparative Example 3 is too much, the puncture resistance of the obtained product shows a significant downward trend, and the limiting oxygen index and flame retardant protection rate of the product also show a certain downward trend.

[0108] It can be seen from Example 1, Examples 5 to 7 and Comparative Example 4 that the grafting rate of maleic anhydride grafted styrene will also affect the comprehensive 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 flame retardant polyolefin non-woven fabric obtained is 8405 J / m 2 When the grafting rate of maleic anhydride grafted styrene in Comparative Example 4 is too low and not within 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] It can be seen from Example 1, Examples 8 to 11 and Comparative Examples 5 to 6 that the average particle size of the modified aluminum hydroxide and the mass percentage of the shell layer will also affect the comprehensive 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 flame retardant polyolefin non-woven fabric obtained is 8398 J / m 2 The above results show that the limiting oxygen index is above 36.1% and the flame retardant protection rate is above 39.3%. When the average particle size of the modified aluminum hydroxide in Comparative Example 5 is too small, the puncture resistance, limiting oxygen index and flame retardant protection rate of the obtained product all show a certain downward trend. When the average particle size of the modified aluminum hydroxide in Comparative Example 6 is too large, the puncture resistance, limiting oxygen index and flame retardant protection rate of the obtained product also show a significant downward trend.

[0110] It can be seen from Example 1 and Comparative Example 7 that when modified aluminum hydroxide is not prepared but aluminum hydroxide and cationic starch are added separately to prepare the product, the obtained product cannot achieve the effect of the present application.

[0111] Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present application rather than to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present 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: 60-85 parts of HDPE, 5-10 parts of TPEE, 5-15 parts of maleic anhydride grafted styrene, 2-6 parts of modified aluminum hydroxide, 6-16 parts of diethyl aluminum hypophosphite, 1-4 parts of antimony trioxide; The grafting rate of maleic anhydride grafted styrene is greater than or equal to 8%; The modified aluminum hydroxide is a core-shell structure, the core layer is aluminum hydroxide, and the shell layer is cationic starch; 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.

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, maleic anhydride grafted styrene 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 maleic anhydride grafted styrene 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: Based on the total mass of the modified aluminum hydroxide, the mass percentage of the shell layer is greater than or equal to 3% and less than or equal to 5%.

5. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that: 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 a load of 2.16 kg according to ASTM D1238.

6. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that: The 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 a load of 2.16 kg according to ASTM D1238.

7. 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 a processing aid.

8. The flame-retardant polyolefin nonwoven fabric according to claim 1, characterized in that: The gram weight of the flame retardant polyolefin non-woven fabric is greater than or equal to 95g / m2, the puncture resistance of the flame retardant polyolefin non-woven fabric is greater than 7956J / m2, the limiting oxygen index of the flame retardant polyolefin non-woven fabric is greater than or equal to 33.9%, and the flame retardant protection rate of the flame retardant polyolefin non-woven fabric is above 34.3%.

9. The method for preparing the flame-retardant polyolefin nonwoven fabric according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: The components are added into a reaction kettle containing a solvent, and then heated and nitrogen is introduced so that the temperature in the reaction kettle is greater than or equal to 200° C. and less than or equal to 230° C., and the pressure is greater than or equal to 10 MPa and less than or equal to 12 MPa, to obtain a spinning solution; The spinning solution is placed in a flash spinning device for spinning and received by a receiving device to form a film. The obtained fiber film is cold pressed and hot rolled to obtain a flash non-woven fabric.

10. Use of the flame-retardant polyolefin nonwoven fabric according to any one of claims 1 to 8 in the preparation of home furnishing and decoration materials, personal protective equipment, transportation materials, construction and engineering materials, industrial application materials, military and defense materials, electronic and electrical product materials, and fire protection materials.

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