Flame-retardant non-woven fabric with multi-layer composite structure and processing technology

Abstract

The invention discloses a flame-retardant non-woven fabric with a multilayer composite structure and a processing technology. The flame-retardant non-woven fabric is prepared from a flame retardant, a combustion-supporting aid, a combustion-supporting enhancer, a gelling agent, polyester fibers, an additive, a supporting polypropylene fiber material and nano-silver ions, the composite material is prepared from the following components in parts by weight: 5-30 parts of a flame retardant, 1-10 parts of a combustion-supporting aid, 1-5 parts of a combustion-supporting enhancer, 5-20 parts of a gelling agent, 10-50 parts of polyester fibers, 1-3 parts of an additive, 20-80 parts of a supporting polypropylene fiber material and 0.1-1 part of nano silver ions, the processing technology comprises the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing; the non-woven fabric obtained through processing is of a multi-layer composite structure, so that the non-woven fabric has high strength and durability, the service life of the non-woven fabric is prolonged, and the flame retardant is added into the formula, so that the flame retardant effect of the non-woven fabric is improved.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric processing, in particular to a flame-retardant non-woven fabric with a multi-layer composite structure and a processing technology. Background Art

[0002] Non-woven fabric is a textile made of fibers bonded together by mechanical, thermal or chemical treatment. Unlike traditional textiles, non-woven fabrics do not go through the spinning and weaving process, but are directly formed by interweaving, bonding or melting fibers. However, the existing non-woven fabrics have poor flame retardant effects during use, which is not conducive to reducing the hazards of fire accidents. At the same time, the single-layer structure of non-woven fabrics has unstable strength and durability, which shortens the service life of non-woven fabrics. Summary of the invention

[0003] The object of the present invention is to provide a flame-retardant nonwoven fabric with a multi-layer composite structure and a processing technology to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a flame-retardant non-woven fabric with a multi-layer composite structure, the formula of which includes: a flame retardant, a combustion-supporting auxiliary agent, a combustion-supporting reinforcing agent, a gelling agent, polyester fiber, an additive, a supporting polypropylene fiber material and nano silver ions, and the weight proportions of each component are: 5-30 parts of the flame retardant, 1-10 parts of the combustion-supporting auxiliary agent, 1-5 parts of the combustion-supporting reinforcing agent, 5-20 parts of the gelling agent, 10-50 parts of the polyester fiber, 1-3 parts of the additive, 20-80 parts of the supporting polypropylene fiber material and 0.1-1 parts of the nano silver ions.

[0005] Preferably, the flame retardant is selected from one of ammonium phosphate, ammonium hexametaphosphate and ammonium chloride.

[0006] Preferably, the combustion aid is one of aluminum oxide and magnesium oxide.

[0007] Preferably, the combustion enhancer is selected from one of nano oxides and nano aluminum borate or a mixture of the two.

[0008] Preferably, the gelling agent is selected from polyvinyl alcohol and polyurethane.

[0009] Preferably, the additive is selected from one or a mixture of stabilizers, toughening agents and antistatic agents.

[0010] A processing technology for a flame-retardant nonwoven fabric with a multi-layer composite structure, comprising the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing;

[0011] In the above step 1, 5-30 parts of flame retardant, 1-10 parts of combustion aid, 1-5 parts of combustion enhancer, 5-20 parts of gelling agent, 10-50 parts of polyester fiber, 1-3 parts of additive, 20-80 parts of supporting polypropylene fiber material and 0.1-1 parts of nano silver ion are weighed according to the weight of each component for standby use;

[0012] In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring;

[0013] In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric;

[0014] In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature;

[0015] In the above step five, the supporting polypropylene fiber material in step one is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is spun onto both sides of the semi-finished non-woven fabric through a spinning device to obtain a finished flame-retardant non-woven fabric.

[0016] Preferably, in step 2, during the stirring process, a sealing cover needs to be provided in the mixer, and a transparent observation window is provided in the sealing cover.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the non-woven fabric processed by the present invention is a multi-layer composite structure, so that the non-woven fabric has higher strength and durability, and the service life of the non-woven fabric is extended, and a flame retardant is added to the formula, thereby improving the flame retardant effect of the non-woven fabric, and the flame retardant non-woven fabric with a multi-layer composite structure has higher thermal stability and can maintain the stability of its structure and performance in a high temperature environment, which makes it widely used in high temperature processes and environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , an embodiment provided by the present invention:

[0021] Embodiment 1:

[0022] A flame-retardant nonwoven fabric with a multi-layer composite structure, the formula of which includes: flame retardant, combustion aid, combustion enhancer, gelling agent, polyester fiber, additive, cotton fiber material, supporting polypropylene fiber material, fiber adhesive and nano silver ion, the weight proportions of each component are respectively: 5 parts of flame retardant, 1 part of combustion aid, 1 part of combustion enhancer, 5 parts of gelling agent, 10 parts of polyester fiber, 1 part of additive, 20 parts of cotton fiber material, 20 parts of supporting polypropylene fiber material, 20 parts of fiber adhesive and 0.1 part of nano silver ion; ammonium phosphate is selected as the flame retardant; aluminum oxide is selected as the combustion aid; nano oxide is selected as the combustion enhancer; polyvinyl alcohol is selected as the gelling agent and a stabilizer is selected as the additive.

[0023] A processing technology for a flame-retardant nonwoven fabric with a multi-layer composite structure, comprising the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing;

[0024] In the above step 1, 5 parts of flame retardant, 1 part of combustion aid, 1 part of combustion enhancer, 5 parts of gelling agent, 10 parts of polyester fiber, 1 part of additive, 20 parts of cotton fiber material, 20 parts of supporting polypropylene fiber material, 20 parts of fiber adhesive and 0.1 part of nano silver ion are weighed according to the weight of each component for standby use;

[0025] In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring, and during the stirring process, a sealing cover is provided in the mixer, and a transparent observation window is provided in the sealing cover;

[0026] In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric;

[0027] In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature;

[0028] In the above step 5, the supporting polypropylene fiber material in step 1 is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is passed through a spinning device to spin the melt onto one side of the semi-finished non-woven fabric;

[0029] In the above step six, the cotton fiber material and the fiber adhesive prepared in step one are mixed evenly for pre-impregnation, so that the cotton fiber material absorbs the fiber adhesive, and then the pre-impregnated cotton fibers are evenly distributed on a forming machine with a semi-finished non-woven fabric. Through a wet mesh making method, the fibers are dispersed on a flat net under the action of a machine, and the formed cotton fiber material is sent to a drying room or hot air treatment equipment to be quickly dried or thermally cured, so that the cotton fiber material and other fibers on the semi-finished non-woven fabric are bonded to each other, thereby obtaining a finished flame-retardant non-woven fabric.

[0030] Embodiment 2:

[0031] A flame-retardant nonwoven fabric with a multi-layer composite structure, the formula of which includes: flame retardant, combustion aid, combustion enhancer, gelling agent, polyester fiber, additive, cotton fiber material, supporting polypropylene fiber material, fiber adhesive and nano silver ion, the weight proportion of each component is respectively: 30 parts of flame retardant, 10 parts of combustion aid, 5 parts of combustion enhancer, 20 parts of gelling agent, 50 parts of polyester fiber, 3 parts of additive, 80 parts of cotton fiber material, 80 parts of supporting polypropylene fiber material, 25 parts of fiber adhesive and 1 part of nano silver ion; ammonium phosphate is selected as the flame retardant; aluminum oxide is selected as the combustion aid; nano oxide is selected as the combustion enhancer; polyvinyl alcohol is selected as the gelling agent and a stabilizer is selected as the additive.

[0032] A processing technology for a flame-retardant nonwoven fabric with a multi-layer composite structure, comprising the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing;

[0033] In the above step 1, 30 parts of flame retardant, 10 parts of combustion aid, 5 parts of combustion enhancer, 20 parts of gelling agent, 50 parts of polyester fiber, 3 parts of additive, 80 parts of cotton fiber material, 80 parts of supporting polypropylene fiber material, 25 parts of fiber adhesive and 1 part of nano silver ion are weighed according to the weight of each component for standby use;

[0034] In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring, and during the stirring process, a sealing cover is provided in the mixer, and a transparent observation window is provided in the sealing cover;

[0035] In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric;

[0036] In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature;

[0037] In the above step 5, the supporting polypropylene fiber material in step 1 is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is passed through a spinning device to spin the melt onto one side of the semi-finished non-woven fabric;

[0038] In the above step six, the cotton fiber material and the fiber adhesive prepared in step one are mixed evenly for pre-impregnation, so that the cotton fiber material absorbs the fiber adhesive, and then the pre-impregnated cotton fibers are evenly distributed on a forming machine with a semi-finished non-woven fabric. Through a wet mesh making method, the fibers are dispersed on a flat net under the action of a machine, and the formed cotton fiber material is sent to a drying room or hot air treatment equipment to be quickly dried or thermally cured, so that the cotton fiber material and other fibers on the semi-finished non-woven fabric are bonded to each other, thereby obtaining a finished flame-retardant non-woven fabric.

[0039] Embodiment 3:

[0040] A flame-retardant nonwoven fabric with a multi-layer composite structure, the formula of which includes: flame retardant, combustion aid, combustion enhancer, gelling agent, polyester fiber, additive, cotton fiber material, supporting polypropylene fiber material, fiber adhesive and nano silver ion, the weight proportions of each component are respectively: 20 parts of flame retardant, 5 parts of combustion aid, 3 parts of combustion enhancer, 10 parts of gelling agent, 20 parts of polyester fiber, 2 parts of additive, 40 parts of cotton fiber material, 40 parts of supporting polypropylene fiber material, 22 parts of fiber adhesive and 0.5 parts of nano silver ion; ammonium phosphate is selected as the flame retardant; aluminum oxide is selected as the combustion aid; nano oxide is selected as the combustion enhancer; polyvinyl alcohol is selected as the gelling agent and a stabilizer is selected as the additive.

[0041] A processing technology for a flame-retardant nonwoven fabric with a multi-layer composite structure, comprising the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing;

[0042] Wherein in the above step 1, according to the weight proportion of each component, 20 parts of flame retardant, 5 parts of combustion aid, 3 parts of combustion enhancer, 10 parts of gelling agent, 20 parts of polyester fiber, 2 parts of additive, 40 parts of cotton fiber material, 40 parts of supporting polypropylene fiber material, 22 parts of fiber adhesive and 0.5 parts of nano silver ion are weighed respectively for standby use;

[0043] In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring, and during the stirring process, a sealing cover is provided in the mixer, and a transparent observation window is provided in the sealing cover;

[0044] In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric;

[0045] In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature;

[0046] In the above step 5, the supporting polypropylene fiber material in step 1 is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is passed through a spinning device to spin the melt onto one side of the semi-finished non-woven fabric;

[0047] In the above step six, the cotton fiber material and the fiber adhesive prepared in step one are mixed evenly for pre-impregnation, so that the cotton fiber material absorbs the fiber adhesive, and then the pre-impregnated cotton fibers are evenly distributed on a forming machine with a semi-finished non-woven fabric. Through a wet mesh making method, the fibers are dispersed on a flat net under the action of a machine, and the formed cotton fiber material is sent to a drying room or hot air treatment equipment to be quickly dried or thermally cured, so that the cotton fiber material and other fibers on the semi-finished non-woven fabric are bonded to each other, thereby obtaining a finished flame-retardant non-woven fabric.

[0048] Embodiment 4:

[0049] A flame-retardant nonwoven fabric with a multi-layer composite structure, the formula of which includes: flame retardant, combustion aid, combustion enhancer, gelling agent, polyester fiber, additive, cotton fiber material, supporting polypropylene fiber material, fiber adhesive and nano silver ion, the weight proportions of each component are respectively: 5 parts of flame retardant, 10 parts of combustion aid, 1 part of combustion enhancer, 20 parts of gelling agent, 10 parts of polyester fiber, 3 parts of additive, 20 parts of cotton fiber material, 80 parts of supporting polypropylene fiber material, 20 parts of fiber adhesive and 1 part of nano silver ion; ammonium phosphate is selected as the flame retardant; aluminum oxide is selected as the combustion aid; nano oxide is selected as the combustion enhancer; polyvinyl alcohol is selected as the gelling agent and a stabilizer is selected as the additive.

[0050] A processing technology for a flame-retardant nonwoven fabric with a multi-layer composite structure, comprising the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing;

[0051] Wherein in the above step 1, 5 parts of flame retardant, 10 parts of combustion aid, 1 part of combustion enhancer, 20 parts of gelling agent, 10 parts of polyester fiber, 3 parts of additive, 20 parts of cotton fiber material, 80 parts of supporting polypropylene fiber material, 20 parts of fiber adhesive and 1 part of nano silver ion are weighed respectively according to the weight parts of each component for standby use;

[0052] In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring, and during the stirring process, a sealing cover is provided in the mixer, and a transparent observation window is provided in the sealing cover;

[0053] In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric;

[0054] In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature;

[0055] In the above step 5, the supporting polypropylene fiber material in step 1 is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is passed through a spinning device to spin the melt onto one side of the semi-finished non-woven fabric;

[0056] In the above step six, the cotton fiber material and the fiber adhesive prepared in step one are mixed evenly for pre-impregnation, so that the cotton fiber material absorbs the fiber adhesive, and then the pre-impregnated cotton fibers are evenly distributed on a forming machine with a semi-finished non-woven fabric. Through a wet mesh making method, the fibers are dispersed on a flat net under the action of a machine, and the formed cotton fiber material is sent to a drying room or hot air treatment equipment to be quickly dried or thermally cured, so that the cotton fiber material and other fibers on the semi-finished non-woven fabric are bonded to each other, thereby obtaining a finished flame-retardant non-woven fabric.

[0057] Embodiment 5:

[0058] A flame-retardant nonwoven fabric with a multi-layer composite structure, the formula of which includes: flame retardant, combustion aid, combustion enhancer, gelling agent, polyester fiber, additive, cotton fiber material, supporting polypropylene fiber material, fiber adhesive and nano silver ion, the weight proportions of each component are respectively: 30 parts of flame retardant, 1 part of combustion aid, 5 parts of combustion enhancer, 5 parts of gelling agent, 50 parts of polyester fiber, 1 part of additive, 80 parts of cotton fiber material, 20 parts of supporting polypropylene fiber material, 25 parts of fiber adhesive and 0.1 part of nano silver ion; ammonium phosphate is selected as the flame retardant; aluminum oxide is selected as the combustion aid; nano oxide is selected as the combustion enhancer; polyvinyl alcohol is selected as the gelling agent and a stabilizer is selected as the additive.

[0059] A processing technology for a flame-retardant nonwoven fabric with a multi-layer composite structure, comprising the following steps: step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing;

[0060] Wherein in the above step 1, 30 parts of flame retardant, 1 part of combustion aid, 5 parts of combustion enhancer, 5 parts of gelling agent, 50 parts of polyester fiber, 1 part of additive, 80 parts of cotton fiber material, 20 parts of supporting polypropylene fiber material, 25 parts of fiber adhesive and 0.1 parts of nano silver ion are weighed according to the weight parts of each component for standby use;

[0061] In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring, and during the stirring process, a sealing cover is provided in the mixer, and a transparent observation window is provided in the sealing cover;

[0062] In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric;

[0063] In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature;

[0064] In the above step 5, the supporting polypropylene fiber material in step 1 is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is passed through a spinning device to spin the melt onto one side of the semi-finished non-woven fabric;

[0065] In the above step six, the cotton fiber material and the fiber adhesive prepared in step one are mixed evenly for pre-impregnation, so that the cotton fiber material absorbs the fiber adhesive, and then the pre-impregnated cotton fibers are evenly distributed on a forming machine with a semi-finished non-woven fabric. Through a wet mesh making method, the fibers are dispersed on a flat net under the action of a machine, and the formed cotton fiber material is sent to a drying room or hot air treatment equipment to be quickly dried or thermally cured, so that the cotton fiber material and other fibers on the semi-finished non-woven fabric are bonded to each other, thereby obtaining a finished flame-retardant non-woven fabric.

[0066] The finished flame-retardant nonwoven fabrics obtained in the above examples were tested and processed respectively, and the test results were statistically analyzed as follows:

[0067] Is it flame retardant? Example 1 yes Example 2 yes Example 3 yes Example 4 yes Example 5 yes

[0068] Based on the above, the advantages of the present invention are that, by adding flame retardants, combustion aids and combustion enhancers into the formula, the flame retardancy of the non-woven fabric is improved, the application scope of the non-woven fabric is expanded, and the non-woven fabric adopts a multi-layer composite structure, so that the non-woven fabric has higher strength and durability, thereby extending the service life of the non-woven fabric.

[0069] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A flame-retardant nonwoven fabric with a multi-layer composite structure, the formula of which includes: Flame retardant, combustion aid, combustion enhancer, gelling agent, polyester fiber, additive, supporting polypropylene fiber material and nano silver ion, characterized in that the weight proportions of each component are: 5-30 parts of flame retardant, 1-10 parts of combustion aid, 1-5 parts of combustion enhancer, 5-20 parts of gelling agent, 10-50 parts of polyester fiber, 1-3 parts of additive, 20-80 parts of supporting polypropylene fiber material and 0.1-1 parts of nano silver ion.

2. The flame-retardant nonwoven fabric with a multi-layer composite structure according to claim 1, characterized in that: The flame retardant is selected from one of ammonium phosphate, ammonium hexametaphosphate and ammonium chloride.

3. The flame-retardant nonwoven fabric with a multi-layer composite structure according to claim 1, characterized in that: The flame retardant auxiliary agent is selected from one of aluminum oxide and magnesium oxide.

4. The flame-retardant nonwoven fabric with a multi-layer composite structure according to claim 1, characterized in that: The flame retardant reinforcing agent is selected from one of nano oxides and nano aluminum borate or a mixture of the two.

5. The flame-retardant nonwoven fabric with a multi-layer composite structure according to claim 1, characterized in that: The gelling agent is selected from one of polyvinyl alcohol and polyurethane.

6. The flame-retardant nonwoven fabric with a multi-layer composite structure according to claim 1, characterized in that: The additive is selected from one or a mixture of stabilizers, toughening agents and antistatic agents.

7. A process for producing a flame-retardant nonwoven fabric having a multi-layer composite structure, comprising the following steps: Step 1, weighing raw materials; step 2, stirring; step 3, heating; step 4, preheating; step 5, spinning; step 6, curing; characterized in that: In the above step 1, 5-30 parts of flame retardant, 1-10 parts of combustion aid, 1-5 parts of combustion enhancer, 5-20 parts of gelling agent, 10-50 parts of polyester fiber, 1-3 parts of additive, 20-80 parts of supporting polypropylene fiber material and 0.1-1 parts of nano silver ion are weighed according to the weight of each component for standby use; In the above step 2, the flame retardant, combustion aid, gelling agent, polyester fiber, additive and nano silver ion weighed in step 1 are placed in a mixer for stirring; In the above step 3, the material stirred evenly in step 2 is heated to a molten state, the melt is spun into semi-finished fibers through a spinning device, and the semi-finished fibers are formed by pressurizing to obtain a semi-finished non-woven fabric; In the above step 4, the semi-finished non-woven fabric obtained in step 4 is preheated by the preheating roller, and then the combustion enhancer is evenly sprayed on the surface of the semi-finished non-woven fabric by spraying, and then the semi-finished non-woven fabric sprayed with the combustion enhancer is contactlessly heated again, and then cooled to room temperature; In the above step five, the supporting polypropylene fiber material in step one is heated to a molten state, and the supporting polypropylene fiber material heated to a molten state is spun onto both sides of the semi-finished non-woven fabric through a spinning device to obtain a finished flame-retardant non-woven fabric.

8. The processing technology of a flame-retardant nonwoven fabric with a multi-layer composite structure according to claim 7, characterized in that: In the step 2, during the stirring process, a sealing cover needs to be provided in the mixer, and a transparent observation window is provided in the sealing cover.

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