Environment-friendly non-woven fabric base cloth with 3D construction structure and preparation method of environment-friendly non-woven fabric base cloth

Abstract

The invention discloses environment-friendly non-woven fabric base cloth with a 3D (three-dimensional) structure and a preparation method. The environment-friendly non-woven fabric base cloth is prepared from polyethylene-vinyl alcohol, isopropanol, distilled water, bisphenol-a epoxy resin, a polythiol curing agent and chitosan. The invention relates to an electrostatic spinning film, which is prepared from the following components in parts by weight: 100 to 120 parts of polyethylene-vinyl alcohol, 70 to 75 parts of isopropyl alcohol, 30 to 35 parts of distilled water, 50 to 65 parts of bisphenol a type epoxy resin, 10 to 12 parts of polymercaptan curing agent and 5 to 7 parts of chitosan. In the electrostatic spinning process, isopropyl alcohol is used as a framework, and meanwhile, an ethylene polymer is volatilized and expanded to form a honeycomb-shaped porous structure; the air permeability and the water permeability of the prepared non-woven fabric are improved; by filling the epoxy resin foam, the non-woven fabric is overlapped into a 3D structure, so that the bearing performance of the prepared non-woven fabric is improved; the chitosan is used as a surface activating substance, so that the chain scission reaction between free radicals is enhanced, the prepared base cloth is easy to degrade, and the process requirements of environment-friendly production are met.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabrics, and specifically to an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure and a preparation method thereof. Background Art

[0002] Non-woven fabrics have the characteristics of moisture-proof, breathable, flexible, light, flame-retardant, low price, recyclable, etc., and are widely used in the fields of sound insulation, heat insulation, electric heaters, masks, clothing, medical treatment and filling materials. The existing non-woven fabric base cloth and its manufacturing process can basically meet the daily use requirements, but there are still certain problems. First, the pore structure inside the non-woven fabric prepared by the existing non-woven fabric spinning process is simple, which affects the air permeability and water permeability of the prepared non-woven fabric. Second, the existing manufacturing process is simple, and the prepared single-layer non-woven fabric material does not have a three-dimensional structure, which affects the bearing performance of the prepared non-woven fabric. Third, most of the existing non-woven fabrics use polymers as raw materials for manufacturing. After preparation, the bond energy between the non-woven fabric particles is strong and it is not easy to decompose later, making it difficult to meet the process requirements of environmental protection production. Therefore, it is very necessary to design an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure and a preparation method thereof. Summary of the Invention

[0003] The purpose of the present invention is to provide an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure and a preparation method thereof, so as to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure, the formula includes: polyethylene-vinyl alcohol, isopropyl alcohol, distilled water, bisphenol A epoxy resin, polythiol curing agent and chitosan; the weight parts of each component are: 100-120 parts of polyethylene-vinyl alcohol, 70-75 parts of isopropyl alcohol, 30-35 parts of distilled water, 50-65 parts of bisphenol A epoxy resin, 10-12 parts of polythiol curing agent and 5-7 parts of chitosan.

[0005] Preferably, the ethylene content in the polyethylene-vinyl alcohol is 70% in terms of the amount of substance.

[0006] A preparation method of an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure includes the following steps:

[0007] Step 1, raw material preparation; Step 2, water bath mixing; Step 3, electrospinning; Step 4, preparation of the filling layer; Step 5, structure construction; Step 6, foaming filling; Step 7, preparation of the casting liquid; Step 8, processing of the base cloth.

[0008] In the above step 1, weigh 100 - 120 parts of polyvinyl alcohol - ethylene copolymer, 140 - 150 parts of isopropyl alcohol, 70 - 80 parts of distilled water, 50 - 65 parts of bisphenol A epoxy resin, 10 - 12 parts of polythiol curing agent, and 5 - 7 parts of chitosan according to various mass fractions respectively, and set aside;

[0009] In the above step 2, put the polyvinyl alcohol - ethylene copolymer prepared in step 1 into a three - necked flask, then add the isopropyl alcohol and distilled water prepared in step 1. After that, place the three - necked flask in a water - bath heating box for water - bath heating. During the water - bath heating process, continuously stir. After water - bath heating, obtain a blend solution and set aside;

[0010] In the above step 3, put the blend solution prepared in step 2 into an electrospinning solution supply system for electrospinning. After electrospinning, obtain a single - layer silk cloth and set aside;

[0011] In the above step 4, put the bisphenol A epoxy resin prepared in step 1 into a blender, then slowly add the polythiol curing agent prepared in step 1. During the addition of the polythiol curing agent, slowly stir the bisphenol A epoxy resin. After the addition of the polythiol curing agent is completed, conduct a foaming treatment in the blender. After the foaming treatment, obtain an epoxy resin foam and set aside;

[0012] In the above step 5, conduct a cutting treatment on the single - layer silk cloth obtained in step 3. After cutting, obtain a bottom - layer silk cloth and a top - layer silk cloth respectively and set aside. Then put the bottom - layer silk cloth at the bottom of the mold, then fill the support layer on the bottom - layer silk cloth, and then place the top - layer silk cloth on top of the support layer to obtain a multi - layer woven cloth and set aside;

[0013] In the above step 6, use a vacuum filling device to fill the epoxy resin foam prepared in step 4 into the multi - layer woven cloth in step 5. After filling, obtain a three - dimensional woven cloth and set aside;

[0014] In the above step 7, put the chitosan prepared in step 1 into a magnetic stirrer, then add acetic acid solution to the magnetic stirrer. Then conduct magnetic stirring in the magnetic stirrer. After magnetic stirring, filter to obtain a casting solution and set aside;

[0015] In the above step 8, soak the multi - layer woven cloth obtained in step 6 in anhydrous ethanol for soaking treatment, then put it into an activation solution for activation treatment. After activation treatment, brush the casting solution obtained in step 7 on the surface of the multi - layer woven cloth, then conduct a baking treatment. After the baking treatment, use sodium hydroxide solution for neutralization. After neutralization, take it out, wash and dry to obtain an environmentally friendly non - woven fabric base with a 3D three - dimensional structure.

[0016] Preferably, in the second step, during the water bath heating, the temperature in the water bath heating box is 80 - 85°C, and the water bath heating is carried out until the polyvinyl alcohol is completely dissolved. When stirring, the stirring speed is 50 - 68 r / min.

[0017] Preferably, in the third step, during the electrospinning process, the concentration of the spinning solution in the spinning solution supply system is 10 wt / %, the spinning voltage is 20 KV, the distance between the spinneret and the receiving screen is 100 mm, and the rotation speed of the roller in the spinning solution supply system is 2400 - 2450 r / min. The fiber diameter of the single-layer silk cloth obtained by electrospinning is 1 - 2 μm.

[0018] Preferably, in the fourth step, when slowly stirring, the stirring speed of the stirrer is 15 - 18 r / min, and the temperature in the stirrer is 45 - 55°C. When foaming, the temperature in the stirrer is 45 - 55°C, and the foaming time is 120 - 150 min. The density of the epoxy resin foam after foaming is 0.22 - 0.25 g / cm 3 。

[0019] Preferably, in the fifth step, the support layer uses a fiberglass fabric as a framework and is filled with acrylic resin for pre-shaping treatment. The filling thickness of the support layer is 0.5 - 0.8 mm.

[0020] Preferably, in the sixth step, during the filling process, an aluminum plate with a thickness of 1.5 mm is placed on the top of the multi-layer fabric as a limiting part. During filling, the gas flow rate in the vacuum filling equipment is 0.6 L / min, and the pressure exerted on the limiting part is adjusted to 0.6 - 0.62 MPa during the filling process.

[0021] Preferably, in the seventh step, the concentration of the acetic acid solution added is 2% - 2.2%, and the addition amount of the acetic acid solution is 500% of the mass fraction of chitosan. When magnetically stirring, the rotation speed of the magnetic stirrer is 240 - 300 r / min, and the magnetic stirring time is 5 - 12 min.

[0022] Preferably, in the eighth step, the soaking treatment time is 2400 - 2420 min, the activating solution is a glutaraldehyde solution with a mass fraction of 50%, and the activating treatment time is 180 - 200 min. The pressure in the oven during baking is 0.04 MPa, and the baking temperature is 60 - 63°C. When neutralizing, the concentration of the sodium hydroxide solution used is 2%.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: For the environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure and its preparation method, isopropanol is used as a solvent to dissolve polyethylene-vinyl alcohol, and the solute and solution are ejected onto the roller of the system through electrospinning. During the high-speed collision process, a single-layer silk cloth skeleton is formed by isopropanol, and at the same time, the ethylene polymer volatilizes and expands in the skeleton to form a honeycomb-like pore structure, improving the air permeability and water permeability of the prepared non-woven fabric; by using a glass fiber fabric pre-shaped by an acrylic resin to connect the two single-layer silk cloths on both sides and filling epoxy resin foam to form a foamed support layer, a non-woven fabric with a 3D three-dimensional structure is laminated, improving the load-bearing performance of the prepared non-woven fabric; by using chitosan as a surface activating substance to coat the surface of the non-woven fabric, the chain-breaking reaction between free radicals is strengthened, weakening the bond energy between polymers, and the prepared non-woven fabric base cloth is easily degradable, meeting the process requirements of environmental protection production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flowchart of the preparation method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1 , the present invention provides a technical solution:

[0027] Example 1:

[0028] An environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure, the formula includes: polyethylene-vinyl alcohol, isopropanol, distilled water, bisphenol A epoxy resin, polythiol curing agent and chitosan; the weight parts of each component are: 120 parts of polyethylene-vinyl alcohol, 75 parts of isopropanol, 35 parts of distilled water, 65 parts of bisphenol A epoxy resin, 12 parts of polythiol curing agent and 7 parts of chitosan, and the ethylene molar content in polyethylene-vinyl alcohol is 70%.

[0029] A preparation method of an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure, including the following steps:

[0030] Step 1, raw material preparation; Step 2, water bath mixing; Step 3, electrospinning; Step 4, filling layer preparation; Step 5, structure building; Step 6, foaming filling; Step 7, casting liquid preparation; Step 8, base cloth processing;

[0031] In the above step 1, weigh 120 parts by mass of poly(ethylene-co-vinyl alcohol), 75 parts of isopropyl alcohol, 35 parts of distilled water, 65 parts of bisphenol A type epoxy resin, 12 parts of polythiol curing agent and 7 parts of chitosan respectively, and set aside;

[0032] In the above step 2, put the poly(ethylene-co-vinyl alcohol) prepared in step 1 into a three-necked flask, then add the isopropyl alcohol and distilled water prepared in step 1, and then put the three-necked flask into a water bath heating box for water bath heating. During the water bath heating process, continuous stirring treatment is carried out. The temperature in the water bath heating box during water bath heating is 85 °C, and water bath heating is carried out until the poly(ethylene-co-vinyl alcohol) is completely dissolved. The stirring speed during stirring treatment is 68 r / min. After water bath heating, a blend is obtained and set aside;

[0033] In the above step 3, put the blend prepared in step 2 into a spinning solution supply system for electrospinning. During electrospinning, the concentration of the spinning solution in the spinning solution supply system is 10 wt / %, the spinning voltage is 20 KV, the distance between the spinneret and the receiving screen is 100 mm, and the roller speed in the spinning solution supply system is 2450 r / min. After electrospinning, a single-layer silk cloth is obtained, and the fiber diameter of the single-layer silk cloth is 2 μm, and set aside;

[0034] In the above step 4, put the bisphenol A type epoxy resin prepared in step 1 into a blender, and then slowly add the polythiol curing agent prepared in step 1. During the addition of the polythiol curing agent, slow stirring of the bisphenol A type epoxy resin is carried out. The stirring speed of the blender during slow stirring is 18 r / min, and the temperature in the blender is 55 °C. After the addition of the polythiol curing agent is completed, foaming treatment is carried out in the blender. The temperature in the blender during foaming treatment is 55 °C, and the foaming treatment time is 150 min. After foaming treatment, an epoxy resin foam is obtained, and the density of the epoxy resin foam after foaming treatment is 0.25 g / cm 3 , and set aside;

[0035] In the above step 5, the single-layer silk cloth obtained in step 3 is cut to obtain a bottom silk cloth and a top silk cloth respectively and set aside. Then put the bottom silk cloth at the bottom of the mold, and then fill a support layer on the bottom silk cloth. The support layer is framed with a glass fiber fabric and filled with acrylic resin for pre-shaping treatment. The filling thickness of the support layer is 0.8 mm. Then place the top silk cloth on the top of the support layer to obtain a multi-layer woven fabric and set aside;

[0036] In Step 6 above, use a vacuum filling device to fill the epoxy resin foam prepared in Step 4 into the multi-layer fabric in Step 5. During the filling process, place an aluminum plate with a thickness of 1.5 mm on the top of the multi-layer fabric as a limiting piece. The gas flow rate in the vacuum filling device during filling is 0.6 L / min, and the pressure exerted on the limiting piece is regulated to 0.62 MPa during the filling process. After filling, a three-dimensional fabric is obtained and set aside for later use;

[0037] In Step 7 above, put the chitosan prepared in Step 1 into a magnetic stirrer, and then add acetic acid solution to the magnetic stirrer. The concentration of the added acetic acid solution is 2.2%, and the addition amount of the acetic acid solution is 500% of the mass fraction of chitosan. Then, perform magnetic stirring in the magnetic stirrer. When performing magnetic stirring, the rotation speed of the magnetic stirrer is 300 r / min, and the magnetic stirring time is 12 min. After magnetic stirring, filter to obtain a casting solution and set aside for later use;

[0038] In Step 8 above, immerse the multi-layer fabric obtained in Step 6 in absolute ethanol for soaking treatment. The soaking treatment time is 2420 min. After soaking treatment, put it into an activation solution for activation treatment. The activation solution is a glutaraldehyde solution with a mass fraction of 50%, and the activation treatment time is 200 min. After activation treatment, apply the casting solution obtained in Step 7 to the surface of the multi-layer fabric, and then perform baking treatment. The pressure in the oven during baking treatment is 0.04 MPa, and the baking treatment temperature is 63°C. After baking treatment, neutralize with sodium hydroxide solution. The concentration of the sodium hydroxide solution used during neutralization is 2%. After neutralization, take it out, wash and dry it to obtain an environmentally friendly non-woven fabric base with a 3D three-dimensional structure.

[0039] Example 2:

[0040] An environmentally friendly non-woven fabric base with a 3D three-dimensional structure, the formula includes: polyethylene-vinyl alcohol, isopropanol, distilled water, bisphenol A epoxy resin, polythiol curing agent and chitosan; the weight fractions of each component are: 100 parts of polyethylene-vinyl alcohol, 70 parts of isopropanol, 30 parts of distilled water, 50 parts of bisphenol A epoxy resin, 10 parts of polythiol curing agent and 5 parts of chitosan. The ethylene molar content in polyethylene-vinyl alcohol is 70%.

[0041] A preparation method of an environmentally friendly non-woven fabric base with a 3D three-dimensional structure, including the following steps:

[0042] Step 1, raw material preparation; Step 2, water bath mixing; Step 3, electrospinning; Step 4, filling layer preparation; Step 5, structure construction; Step 6, foaming filling; Step 7, casting solution preparation; Step 8, base fabric processing;

[0043] In the above step 1, 100 parts by mass of poly(ethylene-co-vinyl alcohol), 140 parts of isopropyl alcohol, 70 parts of distilled water, 50 parts of bisphenol A epoxy resin, and 10 parts of polythiol curing agent are weighed respectively and reserved for use;

[0044] In the above step 2, the poly(ethylene-co-vinyl alcohol) prepared in step 1 is put into a three-necked flask, then the isopropyl alcohol and distilled water prepared in step 1 are added. After that, the three-necked flask is placed in a water bath heating box for water bath heating. During the water bath heating process, continuous stirring treatment is carried out. The temperature in the water bath heating box during water bath heating is 80 °C, and the water bath heating is carried out until the poly(ethylene-co-vinyl alcohol) is completely dissolved. The stirring speed during the stirring treatment is 50 r / min. After the water bath heating, a blend is obtained and reserved for use;

[0045] In the above step 3, the blend prepared in step 2 is put into an electrospinning solution supply system for electrospinning. During the electrospinning process, the concentration of the electrospinning solution in the electrospinning solution supply system is 10 wt / %, the electrospinning voltage is 20 KV, the distance between the spinneret and the receiving screen is 100 mm, and the roller speed in the electrospinning solution supply system is 2400 r / min. After electrospinning, a single-layer silk cloth is obtained, and the fiber diameter of the single-layer silk cloth is 1 μm and reserved for use;

[0046] In the above step 4, the bisphenol A epoxy resin prepared in step 1 is put into a blender, and then the polythiol curing agent prepared in step 1 is slowly added. During the addition of the polythiol curing agent, the bisphenol A epoxy resin is slowly stirred. The stirring speed of the blender during slow stirring is 15 r / min, and the temperature in the blender is 45 °C. After the addition of the polythiol curing agent is completed, foaming treatment is carried out in the blender. The temperature in the blender during foaming treatment is 45 °C, and the foaming treatment time is 120 min. After the foaming treatment, an epoxy resin foam is obtained, and the density of the epoxy resin foam after foaming treatment is 0.22 g / cm 3 , reserved for use;

[0047] In the above step 5, the single-layer silk cloth obtained in step 3 is cut. After cutting, a bottom silk cloth and a top silk cloth are obtained and reserved for use. Then the bottom silk cloth is placed at the bottom of the mold. Next, a support layer is filled on the bottom silk cloth. The support layer is framed with a glass fiber fabric and filled with acrylic resin for pre-shaping treatment. The filling thickness of the support layer is 0.5 mm. Then the top silk cloth is placed on the top of the support layer to obtain a multi-layer fabric and reserved for use;

[0048] In step six above, use a vacuum filling device to fill the epoxy resin foam prepared in step four into the multi-layer fabric in step five. During the filling process, place an aluminum plate with a thickness of 1.5 mm on the top of the multi-layer fabric as a limiting member. The gas flow rate in the vacuum filling device during filling is 0.6 L / min, and the pressure exerted on the limiting member is regulated to 0.6 MPa during filling. After filling, a three-dimensional fabric is obtained and set aside for later use;

[0049] In step seven above, put the chitosan prepared in step one into a magnetic stirrer, and then add acetic acid solution to the magnetic stirrer. The concentration of the added acetic acid solution is 2%, and the addition amount of the acetic acid solution is 500% of the mass fraction of chitosan. Then, perform magnetic stirring in the magnetic stirrer. When performing magnetic stirring, the rotation speed of the magnetic stirrer is 240 r / min, and the magnetic stirring time is 5 min. After magnetic stirring, filter to obtain a casting solution and set aside for later use;

[0050] In step eight above, immerse the multi-layer fabric obtained in step six in absolute ethanol for 2400 min for immersion treatment. After immersion treatment, put it into an activation solution for activation treatment. The activation solution is a glutaraldehyde solution with a mass fraction of 50%, and the activation treatment time is 180 min. After activation treatment, brush the casting solution obtained in step seven on the surface of the multi-layer fabric, and then perform baking treatment. The pressure in the oven during baking treatment is 0.04 MPa, and the baking treatment temperature is 60 °C. After baking treatment, neutralize with sodium hydroxide solution. When neutralizing, the concentration of the sodium hydroxide solution used is 2%. After neutralization, take it out, wash and dry to obtain an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure.

[0051] Example 3:

[0052] An environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure, the formula includes: polyethylene-vinyl alcohol, isopropyl alcohol, distilled water, bisphenol A epoxy resin, polythiol curing agent and chitosan; the weight fractions of each component are: 120 parts of polyethylene-vinyl alcohol, 70 parts of isopropyl alcohol, 35 parts of distilled water, 50 parts of bisphenol A epoxy resin, 12 parts of polythiol curing agent and 5 parts of chitosan, and the ethylene molar content in the polyethylene-vinyl alcohol is 70%.

[0053] A preparation method of an environmentally friendly non-woven fabric base cloth with a 3D three-dimensional structure, including the following steps:

[0054] Step one, raw material preparation; step two, water bath mixing; step three, electrospinning; step four, filling layer preparation; step five, structure construction; step six, foaming filling; step seven, casting solution preparation; step eight, base cloth processing;

[0055] In the above step 1, weigh 120 parts by mass of poly(ethylene - vinyl alcohol), 70 parts of isopropyl alcohol, 35 parts of distilled water, 50 parts of bisphenol A epoxy resin, 12 parts of polythiol curing agent, and 5 parts of chitosan respectively, and set aside;

[0056] In the above step 2, put the poly(ethylene - vinyl alcohol) prepared in step 1 into a three - necked flask, then add the isopropyl alcohol and distilled water prepared in step 1. After that, place the three - necked flask in a water - bath heating box for water - bath heating. During the water - bath heating process, continuous stirring is carried out. The temperature in the water - bath heating box during water - bath heating is 85 °C, and heat until the poly(ethylene - vinyl alcohol) is completely dissolved. The stirring speed during stirring is 50 r / min. After water - bath heating, a blend is obtained and set aside;

[0057] In the above step 3, put the blend prepared in step 2 into a spinning solution supply system for electrospinning. During electrospinning, the concentration of the spinning solution in the spinning solution supply system is 10 wt / %, the spinning voltage is 20 KV, the distance between the spinneret and the receiving screen is 100 mm, and the roller speed in the spinning solution supply system is 2450 r / min. After electrospinning, a single - layer silk cloth is obtained, and the fiber diameter of the single - layer silk cloth is 1 μm, and set aside;

[0058] In the above step 4, put the bisphenol A epoxy resin prepared in step 1 into a blender, then slowly add the polythiol curing agent prepared in step 1. During the addition of the polythiol curing agent, slowly stir the bisphenol A epoxy resin. The stirring speed of the blender during slow stirring is 18 r / min, and the temperature in the blender is 45 °C. After the addition of the polythiol curing agent is completed, carry out foaming treatment in the blender. The temperature in the blender during foaming treatment is 55 °C, and the foaming treatment time is 120 min. After foaming treatment, an epoxy resin foam is obtained, and the density of the epoxy resin foam after foaming treatment is 0.25 g / cm 3 , and set aside;

[0059] In the above step 5, carry out cutting treatment on the single - layer silk cloth obtained in step 3. After cutting, obtain a bottom - layer silk cloth and a top - layer silk cloth respectively and set them aside. Then put the bottom - layer silk cloth at the bottom of the mold, and then fill a support layer on the bottom - layer silk cloth. The support layer uses a glass fiber fabric as a framework and is filled with acrylic resin for pre - shaping treatment. The filling thickness of the support layer is 0.5 mm. Then place the top - layer silk cloth on the top of the support layer to obtain a multi - layer fabric and set it aside;

[0060] In Step 6 above, use a vacuum filling device to fill the epoxy resin foam prepared in Step 4 into the multi-layer fabric in Step 5. During the filling process, place an aluminum plate with a thickness of 1.5 mm on the top of the multi-layer fabric as a limiting member. The gas flow rate in the vacuum filling device during filling is 0.6 L / min, and the pressure applied to the limiting member is regulated to 0.62 MPa during the filling process. After filling, a three-dimensional fabric is obtained and set aside for later use;

[0061] In Step 7 above, put the chitosan prepared in Step 1 into a magnetic stirrer, and then add an acetic acid solution to the magnetic stirrer. The concentration of the added acetic acid solution is 2%, and the addition amount of the acetic acid solution is 500% of the mass fraction of chitosan. Then, perform magnetic stirring in the magnetic stirrer. When performing magnetic stirring, the rotation speed of the magnetic stirrer is 300 r / min, and the magnetic stirring time is 5 min. After magnetic stirring, filter to obtain a casting solution and set aside for later use;

[0062] In Step 8 above, immerse the multi-layer fabric obtained in Step 6 in absolute ethanol for 2420 min for immersion treatment. After immersion treatment, put it into an activation solution for activation treatment. The activation solution is a glutaraldehyde solution with a mass fraction of 50%, and the activation treatment time is 180 min. After activation treatment, apply the casting solution obtained in Step 7 to the surface of the multi-layer fabric, and then perform baking treatment. The pressure in the oven during baking treatment is 0.04 MPa, and the baking treatment temperature is 63°C. After baking treatment, neutralize with a sodium hydroxide solution. The concentration of the sodium hydroxide solution used for neutralization is 2%. After neutralization, take it out, wash and dry it to obtain an environmentally friendly non-woven fabric base with a 3D three-dimensional structure.

[0063] Perform performance tests on the environmentally friendly non-woven fabric base with a 3D three-dimensional structure obtained in the above embodiments respectively, and compare them with the non-woven fabric base on the market. The obtained results are as follows in the table:

[0064] Maximum tensile strength in the transverse direction Maximum tensile strength in the longitudinal direction Elongation at break Example 1 53.7 MPa 18.9 MPa 7.5％ Example 2 52.8 MPa 18.4 MPa 6.8％ Example 3 53.5 MPa 19.5 MPa 6.5％ Comparative example 13.5 MPa 6.2 MPa 2.0％

[0065] Based on the above, the advantages of the present invention are as follows. In the present invention, isopropanol is used as a solvent to dissolve polyvinyl alcohol, and the solute and solution are ejected onto the roller of the system through electrospinning. During the high-speed collision process, the isopropanol forms the framework of a single-layer silk cloth, and at the same time, the ethylene polymer volatilizes and expands in the framework to form a honeycomb-like pore structure, improving the air permeability and water permeability of the prepared non-woven fabric; by using a glass fiber fabric pre-shaped by an acrylic resin to connect the two sides of the single-layer silk cloth and filling an epoxy resin foam to form a foamed support layer, a non-woven fabric with a 3D three-dimensional structure is laminated, improving the bearing performance of the prepared non-woven fabric; by using chitosan as a surface activating substance to coat the surface of the non-woven fabric, the chain-breaking reaction between free radicals is strengthened, the bond energy between polymers is weakened, and the prepared non-woven fabric base cloth is easily degradable, meeting the process requirements of environmental protection production.

[0066] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure, the formula of which includes: Polyethylene-vinyl alcohol, isopropanol, distilled water, bisphenol A epoxy resin, polythiol curing agent and chitosan; the characteristics are that the weight proportions of the components are: 100-120 parts of polyethylene-vinyl alcohol, 70-75 parts of isopropanol, 30-35 parts of distilled water, 50-65 parts of bisphenol A epoxy resin, 10-12 parts of polythiol curing agent and 5-7 parts of chitosan.

2. The environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 1, characterized in that: The amount of ethylene in the polyethylene vinyl alcohol is 70%.

3. A method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure, comprising the following steps: Step 1, raw material preparation; Step 2, water bath mixing; Step 3, electrostatic spinning; Step 4, filling layer preparation; Step 5, structure construction; Step 6, foaming filling; Step 7, mold liquid preparation; Step 8, base fabric processing; It is characterized by: In the above step 1, 100 to 120 parts of polyethylene vinyl alcohol, 140 to 150 parts of isopropanol, 70 to 80 parts of distilled water, 50 to 65 parts of bisphenol A epoxy resin, 10 to 12 parts of polythiol curing agent and 5 to 7 parts of chitosan are weighed according to various weight parts and set aside; In the above step 2, the polyethylene-vinyl alcohol prepared in the above step 1 is placed in a three-necked flask, and then the isopropanol and distilled water prepared in step 1 are added, and then the three-necked flask is placed in a water bath heating box for water bath heating, and stirring is continuously performed during the water bath heating process. After water bath heating, a blended liquid is obtained for standby use; In the above step 3, the blended solution prepared in the above step 2 is placed in the spinning solution supply system for electrostatic spinning, and a single-layer silk cloth is obtained after electrostatic spinning for standby use; In the above step 4, the bisphenol A epoxy resin prepared in the above step 1 is placed in a blender, and then the polythiol curing agent prepared in the step 1 is slowly added, and the bisphenol A epoxy resin is slowly stirred during the addition of the polythiol curing agent. After the polythiol curing agent is added, a foaming treatment is performed in the blender to obtain epoxy resin foam after the foaming treatment, which is set aside; In the above step 5, the single-layer silk cloth obtained in the above step 3 is cut to obtain a bottom layer of silk cloth and a top layer of silk cloth for standby use, and then the bottom layer of silk cloth is placed at the bottom of the mold, and then a support layer is filled on the bottom layer of silk cloth, and then the top layer of silk cloth is placed on the top of the support layer to obtain a multi-layer woven cloth for standby use; In the above step 6, the epoxy resin foam prepared in step 4 is filled into the multi-layer woven fabric in step 5 using a vacuum filling device, and a three-dimensional woven fabric is obtained after the filling is completed, which is set aside; In the above step 7, the chitosan prepared in step 1 is placed in a magnetic stirrer, and then an acetic acid solution is added to the magnetic stirrer, followed by magnetic stirring in the magnetic stirrer, and after magnetic stirring, the casting liquid is filtered to obtain a casting liquid for standby use; In the above step eight, the multilayer fabric obtained in step six is ​​immersed in anhydrous ethanol for immersion treatment, and then immersed in activation liquid for activation treatment. After the activation treatment, the casting liquid obtained in step seven is applied to the surface of the multilayer fabric, and then baked. After the baking treatment, sodium hydroxide solution is used for neutralization, and after neutralization, it is taken out and washed and dried to obtain an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure.

4. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In the step 2, the temperature of the water bath heating box is 80-85° C. during water bath heating, and the water bath is heated until the polyethylene vinyl alcohol is completely dissolved. The stirring speed during the stirring treatment is 50-68 r / min.

5. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In the step three, during the electrospinning process, the concentration of the spinning solution in the spinning solution supply system is 10wt / %, the spinning voltage is 20KV, the distance between the spinneret and the receiving screen is 100mm, and the roller speed in the spinning solution supply system is 2400-2450r / min. The fiber diameter of the single-layer silk cloth obtained by electrospinning is 1-2μm.

6. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In the step 4, the stirring speed of the stirrer during slow stirring is 15-18 r / min, and the temperature in the stirrer is 45-55° C., the temperature in the stirrer during foaming treatment is 45-55° C., and the foaming treatment time is 120-150 min. The density of the epoxy resin foam after foaming treatment is 0.22-0.25 g / cm 3 .

7. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In the step 5, the support layer uses glass fiber fabric as a frame and is filled with acrylic resin for pre-forming treatment. The filling thickness of the support layer is 0.5 to 0.8 mm.

8. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In step six, an aluminum plate with a thickness of 1.5 mm is placed on the top of the multi-layer fabric as a limiter during the filling process. The gas flow rate in the vacuum filling equipment during filling is 0.6 L / min, and the pressure on the limiter is regulated to 0.6 to 0.62 MPa during the filling process.

9. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In the step 7, the solubility of the added acetic acid solution is 2% to 2.2%, and the amount of the acetic acid solution added is 500% of the mass fraction of chitosan. During magnetic stirring, the speed of the magnetic stirrer is 240 to 300 r / min, and the magnetic stirring time is 5 to 12 min.

10. The method for preparing an environmentally friendly non-woven fabric base fabric with a 3D three-dimensional structure according to claim 3, characterized in that: In the step eight, the soaking treatment time is 2400 to 2420 minutes, the activation solution is a 50% by mass glutaraldehyde solution, and the activation treatment time is 180 to 200 minutes. The pressure in the oven during the baking treatment is 0.04 MPa, and the baking treatment temperature is 60 to 63° C. The concentration of the sodium hydroxide solution used during neutralization is 2%.

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