Processing technology of high-toughness composite non-woven fabric

Abstract

The application relates to the field of non-woven fabric manufacturing, and discloses a processing technology of high-toughness composite non-woven fabric.In the application, carbon fiber cloth is first subjected to acid immersion, so that the number of surface active groups is increased, the compatibility of the carbon fiber cloth surface with resin and other materials is improved, and the non-woven fabric / carbon fiber cloth system has better comprehensive performance utilization.The non-woven fabric is hot-pressed with the carbon fiber cloth fabric in the interval as an interlaminar toughening interlayer material to obtain a non-woven fabric / carbon fiber cloth composite material, and the carbon fiber cloth reinforced composite material has excellent performance, such as excellent easy-to-process performance, toughness and other advantages, low density, fatigue resistance and corrosion resistance, so that the non-woven fabric has higher toughness and mechanical performance, and a flexible unsaturated polyester is prepared;the carbon fiber cloth / non-woven fabric composite material is impregnated to obtain a composite material with higher toughness.

Description

TECHNICAL FIELD

[0001] The application relates to the field of non-woven fabric manufacturing technology, in particular to a processing technology of high-strength and high-toughness composite non-woven fabric. BACKGROUND

[0002] With the development of science and technology, higher performance requirements are put forward for non-woven fabrics in production and manufacturing, non-woven fabrics are immersed in finishing coating liquid, and materials are coated on the surface of the non-woven fabrics, which is a common way to improve the performance of non-woven fabrics; meanwhile, carbon fiber cloth is also used as a reinforcing layer of non-woven fabric during actual non-woven fabric processing, the carbon fiber cloth is laid between two layers of non-woven fabric and then hot-pressed into a composite non-woven fabric to improve the comprehensive strength of the non-woven fabric.

[0003] However, the surface of the carbon fiber cloth has strong chemical inertness, weak interface bonding strength with other materials and few surface functional groups, so the interface bonding strength between the carbon fiber cloth and the non-woven fabric is weak, and therefore the reinforcing effect is not obvious. In order to enhance the performance of non-woven fabric materials and prolong the service life thereof, a high-strength and high-toughness composite non-woven fabric needs to be researched. SUMMARY

[0004] The application aims to provide a processing technology of high-strength and high-toughness composite non-woven fabric to solve the problems in the background technology.

[0005] In order to solve the above technical problems, the application provides the following technical scheme:

[0006] A processing technology of high-strength and high-toughness composite non-woven fabric: the preparation process of the high-strength and high-toughness composite non-woven fabric comprises the following steps:

[0007] S1: preparing an impregnating liquid:

[0008] (1) preparing unsaturated polyester resin: uniformly mixing 1,2-propanediol and hexanediol, heating, adding maleic anhydride, isophthalic acid, phthalic anhydride and o-phthalic anhydride, stirring and heating, reacting for a period of time, and obtaining unsaturated polyester resin;

[0009] (2) taking the prepared unsaturated polyester resin, adding propylene glycol butyl ether and glycidyl tert-carbonate, heating to 120-130 DEG C under the protection of nitrogen atmosphere, adding methyl methacrylate, butyl acrylate, styrene and acrylic acid, adding an initiator after reaction for 3-4 h, carrying out neutralization reaction for 30-40 min by adding N,N-dimethylethanolamine, stirring and dispersing for 30 min by adding deionized water, and obtaining an emulsion;

[0010] (3) adding a curing agent and an accelerator to the emulsion prepared in (2), uniformly mixing, and obtaining an impregnating liquid;

[0011] S2: dip the non-woven fabric in the impregnating solution for 20-24 hours, take it out and dry to obtain a pretreated non-woven fabric; wherein the bath ratio is 1:10 when the non-woven fabric is dipped;

[0012] S3: modify the carbon fiber cloth:

[0013] acid dip the surface of the carbon fiber cloth: mix concentrated sulfuric acid and concentrated nitric acid to obtain an acid solution, dip the carbon fiber cloth in the acid solution for 2-3 hours, then put it in a sodium hydroxide solution for neutralization, take it out, rinse and dry, then place the carbon fiber cloth in the impregnating solution for a period of time, take it out and dry to obtain the modified carbon fiber cloth;

[0014] S4: cut the modified carbon fiber cloth and the pretreated non-woven fabric, and stack them from top to bottom in the order of pretreated non-woven fabric, modified carbon fiber cloth, and pretreated non-woven fabric, and hot-press to form a high-strength and high-toughness composite non-woven fabric.

[0015] More preferably, under the protection of a nitrogen atmosphere, 1,2-propanediol and hexanediol are mixed uniformly and heated, maleic anhydride, isophthalic acid, phthalic anhydride, and phthalic anhydride are added and stirred, heated to 190-210°C, reacted for 2-3 hours, cooled to 90-100°C, and continued to react until the acid value is 60 to obtain an unsaturated polyester resin.

[0016] More preferably, in step (1), the dosages of the raw materials are as follows: 10-20 parts by mass of 1,2-propanediol, 5-10 parts by mass of hexanediol, 10-20 parts by mass of maleic anhydride, 2-10 parts by mass of isophthalic acid, 2-10 parts by mass of phthalic anhydride, and 1-10 parts by mass of phthalic anhydride.

[0017] More preferably, the solid content of the emulsion is 35%-40%.

[0018] More preferably, step (2) includes the following raw materials: 1-10 parts by weight of unsaturated polyester resin, 10-20 parts by weight of propylene glycol butyl ether, 1-10 parts by weight of glycidyl tert-carbonate, 10-20 parts by weight of methyl methacrylate, 20-30 parts by weight of butyl acrylate, 1-10 parts by weight of styrene, 1-10 parts by weight of acrylic acid, 1-5 parts by weight of initiator, and 3-6 parts by weight of N,N-dimethylethanolamine.

[0019] More preferably, the initiator is tert-amyl peroxybenzoate.

[0020] More preferably, the curing agent is vinyltriamine, and the promoter is N,N-dimethylaniline, the dosage of the curing agent is 10-12wt% of the total mass of the impregnating solution, and the dosage of the promoter is 5-10wt% of the total mass of the impregnating solution.

[0021] More preferably, the pH value of the acid solution is 4, and the carbon fiber cloth is immersed in the immersion solution for 3-4 hours.

[0022] More preferably, in step S4, the hot-pressing temperature is 120 DEG C, and the pressure is 1.0-1.5 MPa.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] (1) By modifying the surface of the carbon fiber cloth, the number of active groups on the surface is increased, the physical and chemical inertness of the carbon fiber surface is reduced, the bonding force between the carbon fiber and the surface of other materials is enhanced, and the compatibility between the surface of the carbon fiber cloth and the finishing coating liquid is improved. At the same time, the surface is grafted with the finishing coating liquid (immersion solution), and when the two layers of non-woven fabric are compounded, the composite non-woven fabric has better comprehensive performance;

[0025] (2) The non-woven fabric is immersed and pretreated, so that the toughness between the pretreated non-woven fabric / modified carbon fiber cloth / pretreated non-woven fabric is increased, and at the same time, the transverse tensile modulus and strength of the modified carbon fiber are improved; due to the acid immersion treatment of the carbon fiber, the interlaminar interface bonding force is further enhanced, the resistance required for crack and other phenomena is improved, and the interlaminar toughening ability of the pretreated non-woven fabric / modified carbon fiber cloth / pretreated non-woven fabric is greatly improved;

[0026] (3) The non-woven fabric is interlaminarly toughened with carbon fiber, the system thickness is increased, and the wear resistance and stability of the pretreated non-woven fabric / modified carbon fiber cloth / pretreated non-woven fabric system are improved. Through hot-pressing treatment, the uniformity of the system thickness is ensured, and the comprehensive performance is improved. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] The preparation process of the high-strength and high-toughness composite non-woven fabric processing technology includes the following chemicals:

[0029] Maleic anhydride: CAS: 108-31-6, 99%, Nanjing Chemical Reagent Co., Ltd.; Isophthalic acid: CAS: 121-91-5, 680001, Hubei Lalanbai Medicine Chemical Co., Ltd.; Phthalic anhydride: CAS: 528-44-9, Wuhan Andomac New Energy Co., Ltd.; Phthalic anhydride: CAS: 85-44-9, Shandong Changyao New Material Co., Ltd.; Sodium dodecyl sulfate: 151-21-3, Nanjing Chemical Reagent Co., Ltd.; Sodium dodecylbenzenesulfonate: CAS: 25155-30-0, Shanghai Haohong Biological Medicine Science and Technology Co., Ltd.; Vinyl triamine: 99740-64-4, Shandong Mingtu Chemical Co., Ltd.; N,N-dimethylaniline: CAS: 121-69-7, Shandong Mingtu Chemical Co., Ltd.; PA66 resin: ERP27, Shenma Industry Co., Ltd.; Carbon fiber cloth: model: H3K-CS280, product weight: 280g / m 2 , fabric structure: satin, Jiangsu Ruiskar Carbon Fiber Cloth Composite Material Co., Ltd.; Non-woven fabric: product number: 975, Taian Jiahai New Material Technology Co., Ltd.

[0030] The following parts are mass parts:

[0031] Example 1:

[0032] S1: Under the protection of nitrogen atmosphere, 13 parts of 1,2-propanediol and 7 parts of hexanediol were mixed and heated, 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of phthalic anhydride and 5 parts of phthalic anhydride were added and stirred, heated to 200℃, after complete reaction, cooled to 90℃, continue to react until the acid value is 60, get unsaturated polyester resin;

[0033] S2: Take 10 parts of the prepared unsaturated polyester resin, add 15 parts of propylene glycol butyl ether and 7 parts of glycidyl tert carbonate, heat to 120℃ under the protection of nitrogen atmosphere, add 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, 10 parts of acrylic acid, then add 1.5 parts of tert-butyl peroxy benzoate and keep for 3h, continue to add 5 parts of N,N-dimethyl ethanolamine for neutralization reaction, add deionized water, disperse for 30min under the condition of rotation speed of 3000r / min, set the solid content to 40%, get the emulsion;

[0034] S3: Add 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline to the emulsion and mix evenly to get the impregnating solution;

[0035] S4: Dip the non-woven fabric in the impregnating solution for 24h, take out and dry to get the pretreated non-woven fabric, wherein the bath ratio is 1:10;

[0036] S5: acid immersion on the surface of carbon fiber cloth: mix concentrated sulfuric acid and concentrated nitric acid to obtain an acid solution, adjust the pH to 4 to obtain an acid solution, immerse the carbon fiber cloth in the acid solution for 3 hours, then put it into a sodium hydroxide solution for neutralization, take it out, rinse and dry, then place the carbon fiber cloth in the immersion solution for 3 days to obtain the modified carbon fiber cloth;

[0037] S6: cut the carbon fiber cloth and the impregnated non-woven fabric, and stack them from top to bottom in the order of pretreated non-woven fabric, modified carbon fiber cloth, and pretreated non-woven fabric, heat the system to 120℃ under vacuum environment, increase the pressure to 1.0MPa, and press for 3min to obtain a high-strength and high-toughness composite non-woven fabric.

[0038] Example 2:

[0039] S1: under the protection of nitrogen atmosphere, mix 13 parts of 1,2-propanediol and 7 parts of hexanediol uniformly and heat, add 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of phthalic anhydride, and 5 parts of phthalic anhydride, stir and heat to 200℃, after complete reaction, cool to 90℃, continue to react until the acid value is 60, to obtain an unsaturated polyester resin;

[0040] S2: take 10 parts of the prepared unsaturated polyester resin, add 15 parts of propylene glycol butyl ether and 7 parts of glycidyl tert-carbonate, heat to 120℃ under the protection of nitrogen atmosphere, add 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, 10 parts of acrylic acid, then add 1.5 parts of tert-amyl peroxobenzoate and keep warm for 3h, continue to add 5 parts of N,N-dimethylethanolamine for neutralization reaction, add deionized water, disperse for 30min at a rotation speed of 3000r / min, set the solid content to 40%, to obtain an emulsion;

[0041] S3: add 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline to the emulsion and mix uniformly to obtain an immersion solution;

[0042] S4: immerse the non-woven fabric in the immersion solution for 24h, take it out and dry to obtain a pretreated non-woven fabric, wherein the bath ratio is 1:10;

[0043] S5: acid immersion on the surface of carbon fiber cloth: mix concentrated sulfuric acid and concentrated nitric acid to obtain an acid solution, adjust the pH to 4 to obtain an acid solution, immerse the carbon fiber cloth in the acid solution for 3 hours, then put it into a sodium hydroxide solution for neutralization, take it out, rinse and dry, then place the carbon fiber cloth in the immersion solution for 3 days to obtain the modified carbon fiber cloth;

[0044] S6: The carbon fiber cloth and the impregnated non-woven fabric are cut and stacked from top to bottom in the order of pretreated non-woven fabric, modified carbon fiber cloth and pretreated non-woven fabric, the system is heated to 120°C under vacuum environment, the pressure is increased to 1.0 MPa, and after pressing for 3 min, a high-strength and high-toughness composite non-woven fabric is obtained.

[0045] Example 3:

[0046] S1: Under the protection of nitrogen atmosphere, 13 parts of 1,2-propanediol and 7 parts of hexanediol are uniformly mixed and heated, 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of phthalic anhydride and 5 parts of phthalic anhydride are added and stirred, heated to 200°C, after complete reaction, cooled to 90°C, continue to react until the acid value is 60, obtain unsaturated polyester resin;

[0047] S2: Take 10 parts of the prepared unsaturated polyester resin, add 15 parts of propylene glycol butyl ether and 7 parts of glycidyl tert-butyl carbonate, heat to 120°C under nitrogen atmosphere, add 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, 10 parts of acrylic acid, then add 1.5 parts of tert-butyl peroxybenzoate and keep for 3h, continue to add 5 parts of N,N-dimethylethanolamine for neutralization reaction, add deionized water, disperse for 30 min at a rotation speed of 3000r / min, set the solid content to 40%, obtain an emulsion;

[0048] S3: Add 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline to the emulsion and mix uniformly to obtain an impregnating solution;

[0049] S4: The non-woven fabric is immersed in the impregnating solution for 24h, taken out and dried to obtain a pretreated non-woven fabric, wherein the bath ratio is 1:10;

[0050] S5: The surface of the carbon fiber cloth is immersed in acid: mix concentrated sulfuric acid and concentrated nitric acid to obtain an acid solution, adjust the pH to 4 to obtain an acid solution, immerse the carbon fiber cloth in the acid solution for 3h, then put it into a sodium hydroxide solution for neutralization, take it out, rinse and dry, then place the carbon fiber cloth in the impregnating solution for 3 days to obtain a modified carbon fiber cloth;

[0051] S6: The carbon fiber cloth and the impregnated non-woven fabric are cut and stacked from top to bottom in the order of pretreated non-woven fabric, modified carbon fiber cloth and pretreated non-woven fabric, the system is heated to 120°C under vacuum environment, the pressure is increased to 1.0 MPa, and after pressing for 3 min, a high-strength and high-toughness composite non-woven fabric is obtained.

[0052] Comparative Example 1: On the basis of Example 1, the addition of diols is removed when preparing the unsaturated polyester resin:

[0053] S1: 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of phthalic anhydride, and 5 parts of o-phthalic anhydride were stirred under the protection of a nitrogen atmosphere and heated to 200°C. After complete reaction, the temperature was lowered to 90°C, and the reaction was continued until the acid value was 60, obtaining an unsaturated polyester resin;

[0054] S2: 10 parts of the unsaturated polyester resin prepared was taken, 15 parts of propylene glycol butyl ether, and 7 parts of glycidyl tert-carbonate were added, and heated to 120°C under the protection of a nitrogen atmosphere. Then, 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, and 10 parts of acrylic acid were added, followed by adding 1.5 parts of tert-amyl peroxybenzoate and holding for 3 hours. Then, 5 parts of N,N-dimethylethanolamine was added for neutralization reaction, deionized water was added, and dispersed for 30 minutes at a rotation speed of 3000 r / min. The solid content was set to 40%, obtaining an emulsion;

[0055] S3: 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline were added to the emulsion and mixed uniformly, obtaining an impregnating solution;

[0056] S4: The non-woven fabric was immersed in the impregnating solution for 24 hours, taken out and dried, obtaining a pretreated non-woven fabric, wherein the bath ratio was 1:10;

[0057] S5: The surface of the carbon fiber cloth was acid-dipped: concentrated sulfuric acid and concentrated nitric acid were mixed to obtain an acid solution, the pH was adjusted to 4 to obtain an acid solution, the carbon fiber cloth was immersed in the acid solution for 3 hours, then placed in a sodium hydroxide solution for neutralization, taken out, washed and dried, and then placed in the impregnating solution for 3 days, obtaining a modified carbon fiber cloth;

[0058] S6: The carbon fiber cloth and the impregnated non-woven fabric were cut, and the pretreated non-woven fabric, the modified carbon fiber cloth, and the pretreated non-woven fabric were stacked from top to bottom in sequence, and the system was heated to 120°C under vacuum environment, and the pressure was increased to 1.0 MPa, and pressed for 3 minutes, obtaining a high-strength and high-toughness composite non-woven fabric.

[0059] Comparative Example 2: On the basis of Example 1, the carbon fiber cloth was not acid-dipped:

[0060] S1: 13 parts of 1,2-propanediol and 7 parts of hexanediol were mixed and heated, 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of phthalic anhydride, and 5 parts of o-phthalic anhydride were added and stirred, and heated to 200°C. After complete reaction, the temperature was lowered to 90°C, and the reaction was continued until the acid value was 60, obtaining an unsaturated polyester resin;

[0061] S2: Take the prepared 10 parts of unsaturated polyester resin, add 15 parts of propylene glycol butyl ether, 7 parts of tertiary glycidyl carbonate, heat to 120°C under the protection of nitrogen atmosphere, add 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, 10 parts of acrylic acid, then add 1.5 parts of tert-butyl peroxy benzoate and keep for 3h, continue to add 5 parts of N,N-dimethyl ethanolamine for neutralization reaction, add deionized water, disperse for 30min under the condition of 3000r / min, set the solid content to 40%, get the emulsion;

[0062] S3: Add 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline to the emulsion and mix uniformly to obtain an impregnating solution;

[0063] S4: Dip the non-woven fabric in the impregnating solution for 24h, take it out and dry to obtain a pretreated non-woven fabric, wherein the bath ratio is 1:10;

[0064] S5: Place the carbon fiber cloth in the impregnating solution for 3 days to obtain a modified carbon fiber cloth;

[0065] S6: Cut the carbon fiber cloth and the impregnated non-woven fabric, and stack them from top to bottom in the order of pretreated non-woven fabric, modified carbon fiber cloth, and pretreated non-woven fabric, heat the system to 120°C under vacuum environment, increase the pressure to 1.0MPa, and press for 3min to obtain a high-strength and high-toughness composite non-woven fabric.

[0066] Comparative Example 3: Adjust the impregnation time of the non-woven fabric based on Example 1:

[0067] S1: Mix 13 parts of 1,2-propanediol and 7 parts of hexanediol uniformly under the protection of nitrogen atmosphere, heat, add 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of trimellitic anhydride, and 5 parts of phthalic anhydride, stir, heat to 200°C, and after complete reaction, cool to 90°C, continue to react until the acid value is 60, to obtain an unsaturated polyester resin;

[0068] S2: Take the prepared 10 parts of unsaturated polyester resin, add 15 parts of propylene glycol butyl ether, 7 parts of tertiary glycidyl carbonate, heat to 120°C under the protection of nitrogen atmosphere, add 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, 10 parts of acrylic acid, then add 1.5 parts of tert-butyl peroxy benzoate and keep for 3h, continue to add 5 parts of N,N-dimethyl ethanolamine for neutralization reaction, add deionized water, disperse for 30min under the condition of 3000r / min, set the solid content to 40%, get the emulsion;

[0069] S3: Add 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline to the emulsion and mix uniformly to obtain an impregnating solution;

[0070] S4: The non-woven fabric is immersed in the impregnating solution for 36 hours, taken out and dried to obtain a pretreated non-woven fabric, wherein the bath ratio is 1:10;

[0071] S5: The surface of the carbon fiber cloth is subjected to acid immersion: concentrated sulfuric acid and concentrated nitric acid are mixed to obtain an acid solution, the pH is adjusted to 4 to obtain the acid solution, the carbon fiber cloth is immersed in the acid solution for 3 hours, then placed in a sodium hydroxide solution for neutralization, taken out, washed and dried, and then the carbon fiber cloth is placed in the impregnating solution for 3 days to obtain a modified carbon fiber cloth;

[0072] S6: The carbon fiber cloth and the impregnated non-woven fabric are cut, and the pretreated non-woven fabric, the modified carbon fiber cloth and the pretreated non-woven fabric are stacked from top to bottom in sequence, and the system is heated to 120°C under vacuum environment, the pressure is increased to 1.0 MPa, and the pressing is performed for 3 minutes to obtain a high-strength and high-toughness composite non-woven fabric.

[0073] Comparative Example 4: Based on Example 1, the neutralization step of the carbon fiber cloth is not performed:

[0074] S1: Under the protection of nitrogen atmosphere, 13 parts of 1,2-propanediol and 7 parts of hexanediol are uniformly mixed and heated, 10 parts of maleic anhydride, 5 parts of isophthalic acid, 5 parts of trimellitic anhydride and 5 parts of phthalic anhydride are added and stirred, heated to 200°C, after complete reaction, cooled to 90°C, continue to react until the acid value is 60, to obtain an unsaturated polyester resin;

[0075] S2: Take 10 parts of the prepared unsaturated polyester resin, add 15 parts of propylene glycol butyl ether and 7 parts of glycidyl tert-carbonate, heat to 120°C under nitrogen atmosphere, add 18 parts of methyl methacrylate, 25 parts of butyl acrylate, 10 parts of styrene, 10 parts of acrylic acid, then add 1.5 parts of tert-amyl peroxobenzoate and keep for 3 hours, continue to add 5 parts of N,N-dimethylethanolamine for neutralization reaction, add deionized water, disperse for 30 minutes at a rotation speed of 3000 r / min, set the solid content to 40%, to obtain an emulsion;

[0076] S3: Add 10 parts of vinyl triamine and 5 parts of N,N-dimethyl aniline to the emulsion and mix uniformly to obtain an impregnating solution;

[0077] S4: The non-woven fabric is immersed in the impregnating solution for 24 hours, taken out and dried to obtain a pretreated non-woven fabric, wherein the bath ratio is 1:10;

[0078] S5: The surface of the carbon fiber cloth is subjected to acid immersion: concentrated sulfuric acid and concentrated nitric acid are mixed to obtain an acid solution, the pH is adjusted to 4 to obtain the acid solution, the carbon fiber cloth is immersed in the acid solution for 3 hours, taken out and dried, and then the carbon fiber cloth is placed in the impregnating solution for 3 days to obtain a modified carbon fiber cloth;

[0079] S6: The carbon fiber cloth and the non-woven fabric after impregnation are cut to stack from top to bottom in the order of pretreated non-woven fabric, modified carbon fiber cloth, pretreated non-woven fabric, and the system is heated to 120 DEG C under vacuum environment, the pressure is increased to 1.0 MPa, and after pressing for 3 min, a high-strength and high-toughness composite non-woven fabric is obtained.

[0080] Experiment: (1) The product with a size of 180mm*100mm was taken, and the breaking strength of the composite material was tested according to the standard GB / T 3923.1-2013;

[0081] (2) The product with a size of 180mm*100mm was taken, and the tear strength was measured by using a tensile testing machine according to ASTM D4632, and the obtained data are shown in the following table:

[0082] Breaking strength / MPa Tear strength / kgf Example 1 1.5 6.49 Example 2 1.4 6.01 Example 3 1.4 6.14 Comparative Example 1 1.2 5.93 Comparative Example 2 0.8 5.88 Comparative Example 3 0.9 5.76 Comparative Example 4 0.7 5.79

[0083] Conclusion: According to the data in Table 1, the comprehensive performance of the non-woven fabric prepared in Example 1 is better than that of Examples 2 and 3, which shows that the change of temperature during the preparation of unsaturated polyester resin will lead to the decline of its performance, and the temperature given in the application is the best temperature;

[0084] From the comparative examples, it can be seen that the preparation process of unsaturated polyester resin, the modification of carbon fiber cloth, the blending of dihydric alcohol and diacid, the impregnation time and the neutralization process after acid immersion are important for the performance of the system, and without toughening and modification will lead to poor performance of the composite material, and the blending of dihydric alcohol and diacid can improve the compatibility, so as to enhance the comprehensive performance of the composite material.

[0085] In summary, the data show that the processing technology of the high-strength and high-toughness composite non-woven fabric provided by the application can prepare high-strength and high-toughness non-woven fabric.

[0086] Finally, it should be pointed out that: the above only describes the preferred embodiments of the application, and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A processing technology for a high-strength and tough composite nonwoven fabric, characterized in that: The steps are as follows: S1: Preparation of impregnation solution: (1) Preparation of unsaturated polyester resin: Under the protection of nitrogen atmosphere, 1,2-propanediol and hexanediol are mixed evenly and heated. Maleic anhydride, isophthalic acid, trimellitic anhydride and phthalic anhydride are added and stirred. The mixture is heated to 190-210℃ and reacted for 2-3 hours. The temperature is then lowered to 90-100℃ and the reaction continues until the acid value is 60 to obtain unsaturated polyester resin. (2) Take the prepared unsaturated polyester resin, add propylene glycol butyl ether and glycidyl tert-carbonate, heat to 120-130℃ under nitrogen atmosphere, add methyl methacrylate, butyl acrylate, styrene and acrylic acid, add initiator and keep warm for 3-4h, continue to add N,N-dimethylethanolamine to undergo neutralization reaction for 30-40min, add deionized water, stir and disperse for 30min to obtain emulsion; (3) Add curing agent and accelerator to the emulsion prepared in (2) and mix evenly to obtain impregnation liquid; the curing agent is vinyltriamine and the accelerator is N,N-dimethylaniline, the amount of the curing agent is 10 to 12 wt% of the total mass of the impregnation liquid; the accelerator is 5 to 10 wt% of the total mass of the impregnation liquid; S2: Immerse the nonwoven fabric in the impregnation solution for 20-24 hours, remove and dry to obtain the pretreated nonwoven fabric; The liquor ratio for impregnating non-woven fabric is 1:10; S3: Modification of carbon fiber cloth: The surface of the carbon fiber cloth is acid-impregnated: concentrated sulfuric acid and concentrated nitric acid are mixed to obtain an acid solution. The carbon fiber cloth is immersed in the acid solution for 2-3 hours, then neutralized in sodium hydroxide solution, removed, rinsed and dried. The carbon fiber is then placed in the impregnation solution and impregnated for a period of time, removed and dried to obtain the modified carbon fiber cloth. The pH value of the acid solution is 4, and the impregnation time of the carbon fiber cloth in the impregnation solution is 3-4 hours. S4: Hot pressing: Cut the modified carbon fiber cloth and the pretreated nonwoven fabric, and stack them from top to bottom in the order of pretreated nonwoven fabric, modified carbon fiber cloth, and pretreated nonwoven fabric, and hot press them to form a high-strength and tough composite nonwoven fabric; the hot pressing temperature is 120℃ and the pressure is 1.0~1.5MPa.

2. The processing technology of a high-strength and tough composite nonwoven fabric according to claim 1, characterized in that: In step (1), the amount of each raw material used is as follows: by mass, 10-20 parts of 1,2-propanediol, 5-10 parts of hexanediol, 10-20 parts of maleic anhydride, 2-10 parts of isophthalic acid, 2-10 parts of phthalic anhydride, and 1-10 parts of trimellitic anhydride.

3. The processing technology for a high-strength and tough composite nonwoven fabric according to claim 1, characterized in that: In step (2), the solid content of the emulsion is 35% to 40%.

4. The processing technology of a high-strength and tough composite nonwoven fabric according to claim 1, characterized in that: Step (2) includes the following raw materials: by weight: 1-10 parts unsaturated polyester resin, 10-20 parts propylene glycol butyl ether, 1-10 parts glycidyl tert-carbonate, 10-20 parts methyl methacrylate, 20-30 parts butyl acrylate, 1-10 parts styrene, 1-10 parts acrylic acid, 1-5 parts initiator, and 3-6 parts N,N-dimethylethanolamine.

5. The processing technology for a high-strength and tough composite nonwoven fabric according to claim 4, characterized in that: In step (2), the initiator is tert-amyl peroxide.